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10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
converter with a 40 μF input capacitor, and a 4kWPV array. The results corroborate thetheoretical analysis; they evidence the problems of the traditional control, and validate the
proposed control with such a small
capacitor. (Index Terms—Adaptive control,
photovoltaic converters, photovoltaic power
systems, small-signal modeling, voltage
control.)
PE13 An Adaptive Output
Current Estimation Circuit
for a Primary-Side
Controlled LED Driver
Abstract—A primary-side controlled method is
commonly used in flyback LED driver to
regulate output current by employing an auxiliary
winding. However, owing to intrinsic
propagation delay in real-world circuits, aprimary-side controlled flyback converter
experiences a worse line regulation. This paper
proposes a smart output current estimation
scheme to improve line regulation for constant
on-time control, and it can be compatible with
the current flyback topology. A 9.5-W
prototype of the proposed flyback LED driverhas been fabricated in Nuvoton Technology
Corporation 0.6-μm 5-V/40-V CMOS
process. The maximum switching frequency is
set to around 100 kHz with universal-line input,
single-stage power factor correction for LED
lighting applications. Experimental results prove
that the proposed scheme can improve the line regulation within 1.5% and the power efficiency
can be up to 89.7%. (Index Terms—Flyback
converter, light-emitting diode (LED) driver, line
regulation, primary-side controlled.)
IEEE 2013
PE14 An Optimal Control
Method for Photovoltaic
Grid-Tied-Interleaved
Flyback Microinverters to
Achieve High Efficiency in
Wide Load Range
Abstract—Boundary conduction mode (BCM)
and discontinuous conduction mode (DCM)
control strategies are widely used for the
flyback microinverter. The BCM and DCM
control strategies are investigated for the
interleaved flyback microinverter concentrating
on the loss analysis under different loadconditions. These two control strategies have
IEEE 2013
10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
PE16 Analysis and Design of aPush–Pull Quasi-Resonant
Boost Power Factor
Corrector
Abstract—This paper proposes a novel
power-factor corrector (PFC), which is mainly
composed of two-phase transition-mode (TM)
boost-type power-factor correctors (PFCs)
and a coupled inductor. By integrating two boost
inductors into one magnetic core, not only thecircuit volume is reduced, but also the operating
frequency of the core is double of the switching
frequency. Comparing with single-phase TMboost PFC, both the input and output currentripples of the proposed PFC can be reduced if
the equivalent inductance of the coupled inductor equals the inductance of singlephase
TM boost PFC. Therefore, both the power-factor value and the power density are
increased. The proposed topology is capableof sharing the input current and output currentequally. A cut-inhalf duty cycle can reduce the
conduction losses of the switches and both theturns and diameters of the inductor windings.
The advantages of aTMboost PFC, such asquasi-resonant (QR) valley switching on the
switch and zero-current switching (ZCS) of theoutput diode, are maintained to improve theoverall conversion efficiency. Detailed analysisand design procedures of the proposedtopology are given. Simulations and experiments
are conducted on a prototype with a universalline voltage, a 380-V output dc voltage and a
200-W output power to verify itsfeasibility. (Index Terms—Coupled inductor,
power factor corrector, push– pull topology, quasi-resonant (QR) converter.)
IEEE 2013
PE17 Analysis of a Fifth-OrderResonant Converter forHigh-Voltage DC Power
Supplies
Abstract—Power transformer is one of themost complex parts of power converters. The complicated behavior of the transformer is
usually neglected in the power converteranalysis and a simple model is mostly used to
analyze the converter. This paper presents aprecise analysis of a fifth-order resonant
converter which has incorporated the resonantcircuit into the transformer. The derived model,which is based on the accurate model of the
power transformer, can fully predict thebehavior of the fifth-order resonant converter.
IEEE 2013
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The proposed fifth-order resonant converter isable to effectively reduce the range of phase-shift angle fromno load to full load for a fixed-
frequency phase-shift control approach.Therefore, the converter is able to operate
under zero voltage switching during entire loadrange with a fixed-frequency control method.
Also, the proposed converter offers a high gainwhich leads to a lower transformer turns ratio. A
10-kVDC, 1.1-kW prototype has beenprepared to evaluate the performance of theproposed converter. The experimental results
exhibit the excellent accuracy of the proposedmodel and the superiority of the performance
compared to the lower order resonantconverters, especially for high-voltage
applications. (Index Terms—Fifth-orderresonant converter, high-voltage dc powersupply, phase-shift fixed-frequency control
approach, steady state analysis, zero voltageswitching (ZVS) operation.)
PE18 Analysis, Design, andExperimental Results of a
Novel Soft-SwitchingSnubberless Current-Fed
Half-Bridge Front-EndConverter-Based PV
Inverter
Abstract—This paper proposes a new novelsnubberless currentfed half-bridge front-end
isolated dc/dc converter-based inverter forphotovoltaic applications. It is suitable for grid-
tied (utility interface) as well as off-grid(standalone) application based on the mode of
control. The proposed converter attains clamping of the device voltage by secondarymodulation, thus eliminating the need of
snubber or active-clamp. Zero-current switchingor natural commutation of primary devices and
zero-voltage switching of secondary devices isachieved. Soft-switching is inherent owing to the
proposed secondary modulation and ismaintained during wide variation in voltage and power transfer capacity and thus is suitable forphotovoltaic (PV) applications. Primary devicevoltage is clamped at reflected output voltage,
and secondary device voltage is clamped atoutput voltage. Steady-state operation and
analysis, and design procedure are presented.Simulation results using PSIM 9.0 are given to
verify the proposed analysis and design. Anexperimental converter prototype rated at 200
IEEE 2013
10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
Converter for Improved-Efficiency Domestic Induction Heating System
Abstract—Induction heating (IH) technology isnowadays widely present in domestic appliances
because of its cleanness, high efficiency, andfaster heating process. All of these advantagesare due to its heating process, where the pot is
directly heated by the induced currentsgeneratedwith a varyingmagnetic field.As a result, the glass where the pot is supported is notdirectly heated and, consequently, efficiency
and heating times are improved. IH systems arebased on dc-link inverters to generate therequired alternating current to feed the inductor.
Usually, resonant converters are used to achievehigher efficiencies and power densities. In such
systems, themaximum output power andefficiency are achieved at the resonant
frequency, and the switching frequency isincreased to reduce the output power. As a
consequence, in these converters, the efficiencyis also reduced in the low-medium output power range. This paper proposes the use of the half-
bridge inverter in two operating modes toachieve higher efficiency in a wide output power
range. The power converter topology can bereconfigured by changing the resonant
capacitors through electromechanical relays. Asa consequence, the entire efficiency of thecooking process is improved with a cost-
effective procedure.(Index Terms—Inductionheating (IH), inverter, resonant power
in Medium-Voltage Drivessource-fed drives. By analyzing the CMV values
at all switching states under different operatingconditions of a currentsource-inverter (CSI)-based motor drive, this paper first indicates that
the CMV peaks are produced by the zero statesin most of the cases. The nonzero-state (NZS)
modulation techniques employed in voltage-source converters are adapted for use in a
spacevector- modulated current-source converter (CSC) to reduce the CMV magnitude.For NZS modulation in CSCs, the nearest
threestate (NTS) modulation sequences aredesigned with good loworder harmonic
performances in their linear modulation region ofma ≥ 0.67 and with no increase in the device
switching frequency. A combined active-zero-state (AZS) modulation technique is alsoproposed as compensation, for a lower
modulation index in the range of 0.4–0.67, whena compromise is made between the dc-link
current minimization and high input power factorcontrol. The simulation and experimental results
are provided to validate the CMV reductioneffects and harmonic performances of the NTSand combined AZS modulation methods inCSI-fed drives. (Index Terms—Active-zero-state (AZS) modulation, commonmode voltage
methodology for optimal design oftransformerless photovoltaic (PV) inverterstargeting a cost-effective deployment of grid-
connected PV systems. The optimal switchingfrequency as well as the optimal values and
types of the PV inverter components iscalculated such that the PV inverter LCOE
generated during the PV system lifetime period isminimized. The LCOE is also calculatedconsidering the failure rates of the components,which affect the reliability performance andlifetime maintenance cost of the PV inverter. A
design example is presented, demonstrating that
IEEE 2013
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determine the input current of MPPTs, the PV-string configuration check is accomplished
online. The perturbation and observationmethod are applied for maximum power point tracking. Moreover, the current balancing of twoMPPT modules in parallel is achieved. In this
paper, the system configuration and theoperational principle of the proposed MPPT
are first introduced. Afterward, the perturbationand observation method and the mode transitionare demonstrated. Flowcharts of the online
PV-string configuration check and currentbalancing are explained. The validity of
configuration check and current balancing is verified via the experimental results. Maximum
power tracking performance and powerconversion efficiency are also obtained. (Index Terms—Current balancing, dc distribution
system, maximum power point tracking,photovoltaic (PV), solar power.)
PE33 Digital Plug-In RepetitiveController for Single-Phase
Bridgeless PFC Converters
Abstract—This paper investigates a plug-inrepetitive control scheme for bridgeless power
factor correction (PFC) converters to mitigateinput current distortions under continuousconduction mode and discontinuous conduction
mode operating conditions. From the PFCconverter model and the fact that a type-II
compensator is used, a design methodology tomaximize the bandwidth of the feedback
controller is suggested. After that, the errortransfer function including the feedbackcontroller is derived, and the stability of the
repetitive control scheme is evaluated using theerror transfer function. The implementation of
the digital repetitive controller is also discussed.The simulation and experimental results show
that the input current THD is significantlyimproved by using the proposed control scheme
for a 1-kW single-phase bridgeless PFCconverter prototype. (Index Terms—AC–DCconverters, bridgeless power factor correction
(PFC) converter, digital average currentcontrol, repetitive control.)
IEEE 2013
PE34 Dual TransformerlessSingle-Stage Current
Abstract—Alternative energy sources have forsome time attracted great interest in the area of
IEEE 2013
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Source Inverter WithEnergy Management Control Strategy
static converter development. This fact is relatedin greater part to issues such as sustainabilityand detrimental effects on the natural
environment, which all contribute to the viabilityof this type of energy source. In this context,
power electronics performs important tasksmaking viable the connection of all these kind
of clean power sources to the conventional grid and also to the load. From this perspective, anew challenge must be faced which is the
development of energy management systemscapable of providing intelligent planning and
control of appliances in low- and high-power applications. That being so, this paper intends tocontribute presenting a novel dual
transformerless single-stage current sourceinverter fed by a proton exchange membranefuel cell (PEMFC) and a photovoltaic (PV)array. High voltage gain and totally controlledoutput voltage can be achieved without using
dedicated step-up dc–dc converters ortransformers either. The main feature of thisinverter structure is the intelligent powermanagement technique which focuses on theextraction of maximum power from the PV array
keeping the PEMFC as an energy storagesystem. Theoretical analysis is presented andcorroborated by experimental results of a400Wlaboratory prototype. (IndexTerms—
PE35 Electric Equivalent Modelfor Induction ElectrodelessFluorescent Lamps
Abstract—This paper presents an electricequivalent model applied to induction electrodeless fluorescent lamps. The model is
based on passive components and takes intoaccount the real and reactive lamp power. Thepresented model and its obtention methodologywill be an important tool for ballast designers.
One of the most important features of theproposed methodology is the concern regarding core losses and lamp reactivecharacteristics, because nowadays there are noelectricmodels including these characteristics. In
order to obtain and validate the electrodeless
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10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
lamp model, a series–parallel resonant half-bridge inverter is used as ballast. Plasma andlamp windings are modeled as resistances and
reactances depending on the lamp power.Simulations employing the proposed model arealso presented, showing an excellent agreementwith experimental results. (Index Terms—
Electrodeless fluorescent lamps, equivalentmodel, high frequency.)
PE36 Enhanced Control of aDFIG-Based Wind-Power
Generation System WithSeries Grid-Side Converter UnderUnbalanced Grid VoltageConditions
Abstract—This paper presents an enhancedcontrol method for a doubly fed induction
generator (DFIG)-based wind-power generationsystem with series grid-side converter (SGSC)under unbalanced grid voltage conditions. Thebehaviors of the DFIG system with SGSCduring network unbalance are described. By
injecting a series control voltage generated fromthe SGSC to balance the stator voltage, theadverse effects of voltage unbalance upon theDFIG, such as stator and rotor currentunbalances, electromagnetic torque, and power
pulsations, can be removed, and then theconventional vector control strategy for therotor-side converter remains in full force underunbalanced conditions. Meanwhile, three
control targets for the parallel grid-side converter (PGSC) are identified, includingeliminating the oscillations in the total activepower or reactive power, or eliminatingnegative-sequence current injected to the grid.
Furthermore, a precise current reference generation strategy for the PGSC has beenproposed for the PGSC to further improve theoperation performance of the whole system.
Finally, the proposed coordinated controlstrategy for the DFIG system with SGSC hasbeen validated by the simulation results of a 2-MW-DFIG-based wind turbine with SGSC and experimental results on a laboratory-scale
experimental rig under small steady-state gridvoltage unbalance. (Index Terms—Doubly fedinduction generator (DFIG), enhanced control,grid voltage unbalance, series grid-side
converter (SGSC), wind-power generation.)
IEEE 2013
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Abstract—Traditional voltage-source inverteris limited by its only voltage step-downoperation, while current-source inverter islimited by its only current step-down mode. In
order to add an extra boosting flexibility whilekeeping the number of active semiconductorsunchanged, voltage-type and current-type Z-source inverters were earlier proposed. Thesenew classes of inverters are generally more
robust and less sensitive to electromagneticnoises. However, their boosting capabilities aresomehow compromised by high componentstresses and poorer spectral performances
caused by low modulation ratios. Their boosting gains are, therefore, limited in practice. Toovercome these shortcomings, the generalizedswitched-inductor and switched-capacitor Z-source inverters are proposed,whose extra
boosting abilities and other advantages havealready been verified in simulation andexperiment. (Index Terms—Cascadedinverters, multicell inverters, switchedcapacitor
Abstract—This paper investigates the suitabilityof selective harmonic elimination (SHE) for
low-loss multimegawatt gridconnectedphotovoltaic (PV) inverters. The proposedsystem is able to meet utilities regulations, IEEEand IEC standards. In an attempt tosubstantiate the potential superiority of SHE
over carrier-based or space-vector pulsewidthmodulation (PWM), this paper demonstratesthat SHE may allow grid-connected PV invertersto be controlled using a switching frequency of
less than 1 kHz, while the inverter is still able toprovide necessary operation features such asindependent control of active and reactivepowers and operation control simplicity. Forsystem validation, experimental results with
SHE are compared to the case when the inverter is controlled using third-harmonicinjection PWM, with a 2-kHz switchingfrequency. Furthermore, the paper proposes anew implementation technique for SHE that
IEEE 2013
10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
utilizes the third harmonics to spread theswitching angles over 90◦ instead of beinglocated in a narrow range as generated whenusing conventional techniques, along with increases in modulation index. The advantages of
the proposed technique include simplicity inimplementation and flexibility in PWMwaveforms. Simulation and experimentationdemonstrate agreement, which validates the practicability of the proposed system. (Index
PE39 High Boost Ratio HybridTransformer DC–DCConverter for Photovoltaic
Module Applications
Abstract—This paper presents a nonisolated,high boost ratio hybrid transformer dc–dc converter with applications for low-voltage
renewable energy sources. The proposed converter utilizes a hybrid transformer to transferthe inductive and capacitive energysimultaneously, achieving a high boost ratio witha smaller sized magnetic component. As a
result of incorporating the resonant operation mode into the traditional high boost ratiopulsewidth modulation converter, the turn-offloss of the switch is reduced, increasing theefficiency of the converter under all load
conditions. The input current ripple andconduction losses are also reduced because ofthe hybrid linear-sinusoidal input current waveforms. The voltage stresses on the active
switch and diodes are maintained at a low leveland are independent of the changing inputvoltage over a wide range as a result of theresonant capacitor transferring energy to theoutput of the converter. The effectiveness of the
proposed converter was experimentally verifiedusing a 220-W prototype circuit. Utilizing an input voltage ranging from 20 to 45V and a loadrange of 30–220W, the experimental results
show system of efficiencies greater than 96%with a peak efficiency of 97.4% at 35-V input,160-W output. Due to the high system efficiency and the ability to operate with a widevariable input voltage, the proposed converter
IEEE 2013
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is an attractive design for alternative low dcvoltage energy sources, such as solar
photovoltaic modules and fuel cells. (Index Terms—California energy commission (CEC)efficiency, energy sources with low dc voltage,European union (EU) efficiency, high boost ratio
dc–dc, high efficiency, hybrid transformer,
photovoltaic (PV) module.)
PE40 High Power Factor AC–DC LED Driver With Film
Capacitors
Abstract—In this paper, a new method isproposed to eliminate electrolytic capacitors in
a two-stage ac–dc light-emitting diode (LED)driver. DC-biased sinusoidal or square-waveLED drivingcurrent can help to reduce thepower imbalance between ac input and dcoutput. In doing so, film capacitors can be
adopted to improve LED driver’s lifetime. Therelationship between the peakto- average ratioof the pulsating current in LEDs and the storagecapacitance according to given storage
capacitance is derived. Using the proposed“zero-low-level square-wave driving current”scheme, the storage capacitance in the LED driver can be reduced to 52.7% comparing withthat in the driver using constant dc driving
current. The input power factor is almost unity,which complies with lighting equipmentstandards such as IEC-1000-3-2 for Class C equipments. The voltage across the storagecapacitors is analyzed and verified during the
whole pulse width modulation dimming range.For the ease of dimming and implementation, a50WLED driver with zero-low-level square-wave driving current is built and the experimental
results are presented to verify the proposedmethods. (Index Terms—Converters, dimming,LED driver, lighting, pulsating driving current.)
IEEE 2013
PE41 High-Efficiency
Asymmetrical Half-BridgeConverter WithoutElectrolytic Capacitor for Low-Output-Voltage AC–DC LED Drivers
Abstract—Due to their high reliability and
luminous efficacy, high-brightness light-emittingdiodes are being widely used in lightingapplications, and therefore, their powersupplies are required to have also high reliability and efficiency. A very common approach for
achieving this in ac–dc applications is using atwo-stage topology. The power factor correctorboost converter operating in the boundary
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conduction mode is a very common converterused as first stage. It is normally designedwithout electrolytic capacitors, improving
reliability but also increasing the low-frequencyripple of the output voltage. The asymmetricalhalf-bridge (AHB) is a perfect option for thesecond stage as it has very high efficiency, it
operates at constant switching frequency, andits output filter is small (i.e., it can be also easilyimplemented without electrolytic capacitors).Moreover, the AHB is an excellent candidatefor selfdriven synchronous rectification (SD-SR)
as its transformer does not have dead times.However, the standard configuration of theSD-SR must bemodified in this case in order todeal with the transformer voltage variations dueto the input voltage ripple and, more important,
due to the LED dimming state. Thismodification is presented in this paper. Anotherimportant issue regarding the AHB is that itsclosed-loop controller cannot be very fast and
it cannot easily cancel the previously mentioned low-frequency ripple. In this paper, a feed-forward technique, specifically designed toovercome this problem, is also presented. Theexperimental results obtained with a 60-W
topology show that efficiency of the AHB maybe very high (94.5%), while the inherent controlproblems related to the AHB can be overcomeby the proposed feed-forward technique. (Index
Terms—AC–DC converter, asymmetrical halfbridge, dc– dc converter, LED drivers, low-output voltage, self-driven synchronousrectification (SD-SR).)
PE42 High-Efficiency Single-
Input Multiple-Output DC–DC Converter
Abstract—The aim of this study is to develop a
high-efficiency single-input multiple-output (SIMO) dc–dc converter. The proposedconverter can boost the voltage of a low-voltage input power source to a controllable
high-voltage dc bus and middle-voltage outputterminals. The high-voltage dc bus can take asthe main power for a high-voltage dc load orthe front terminal of a dc–ac inverter. Moreover, middle-voltage output terminals can
supply powers for individual middle-voltage dc
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loads or for charging auxiliary power sources(e.g., battery modules). In this study, acoupled-inductorbased dc–dc converter scheme utilizes only one power switch with the
properties of voltage clamping and softswitching, and the corresponding devicespecifications are adequately designed. As aresult, the objectives of high-efficiency power conversion, high stepup ratio, and various output
voltages with different levels can be obtained.Some experimental results via a kilowatt-level prototype are given to verify the effectiveness ofthe proposed SIMO dc–dc converter in
practical applications. (Index Terms—Coupledinductor, high-efficiency power conversion,single-input multiple-output (SIMO) converter,soft switching, voltage clamping.)
PE43 Hybrid-Frequency Modulation for PWM-Integrated ResonantConverters
Abstract—This paper presents a uniquemodulation method for extending the input rangeof pulse-width modulation (PWM)- integratedresonant converters, such as the isolated boostresonant converter, while maintaining high
conversion efficiency. The technique includesprimarily the hybridizing of constant-on, constantoff, and fixed-frequency controldepending only on the required duty cycle. The
modulation scheme reduces core loss andconduction loss dramatically by decreasing theapplied volt-seconds at the transformer and improving the switching period utilization. Withhybrid-frequency control, the circuit
alsomaintains zero current switching for theoutput diodes, minimizes switching loss, andeliminates circulating energy at the transformeracross the entire operating range. It also allowsfor a predictable voltage gain, dependent only
on duty cycle and transformer turns ratio. Adetailed loss analysis is provided and verifiedagainst a 180 W experimental prototype, withan input range of 12–48 V and a switching
frequency range of 30–70 kHz. Implementationissues are also handled with a variety ofsolutions for realizing the modulation scheme.Experimental results show greater than 4%weighted efficiency improvement in the
IEEE 2013
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Operation of a CSI-BasedInduction Motor Drive:Long Feeder Case
Abstract—Various applications, like in
underground mines and oil and gas industries,require remote operation of vectorcontrolledmedium-voltage variable speed drives via along motor feeder. The use of voltage sourceinverters in such cases leads to motor
overvoltage and harmonic quality problems. Thecurrent source inverter (CSI) is ideally matchedto these applications because of its motor-friendly voltage output. Speed sensorlessoperation is mandatory due to the longmotor
feeder. Although the model reference adaptivesystem (MRAS) is a powerful and provenspeed estimation tool, its implementation in longmotor feeder drives faces many challenges.
Among them, and addressed in this paper, areinherent dc offset in its stator model, the need foractual motor voltage and current values, andoscillations in the estimated speed due to errorsin the motor current measurement signals. In
this paper, a sensorless CSI vector-controlleddrive, suitable for long motor feeder applications,is studied. Improved speed estimation isachieved by proposing 1) a modified dc-offset
eliminator for an MRAS speed estimation and 2)a compensation technique for motor current’smeasurement errors. Intensive experimental results, for a low-voltage scaled model, alongwith simulations validate the effectiveness of the
proposed technique. (Index Terms—Currentsource inverter, long feeder, medium voltage
of high boost voltage inverters that improve upon the conventional trans-Z-source and trans-quasi-Z-source inverters. The improved trans-Z-source inverter provides continuous input
current and a higher boost voltage inversion capability. In addition, the improved inverter cansuppress resonant current at startup, whichmight destroy the device. In comparison to theconventional trans-Z-source/-trans-quasi-
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Zsource inverters, for the same transformer turn ratio and input and output voltages, the improved
inverter has a higher modulation index withreduced voltage stress on the dc link, lowercurrent stress flow on the transformer windingsand diode, and lower input current ripple. In
order to produce the same input and outputvoltage with the same modulation index, theimproved inverter uses a lower transformer turnratio compared to the conventional inverters.Thus, the size and weight of the transformer in
the improved inverter can be reduced. Thispaper presents the operating principles, analysisand simulation results, and compares them with those of the conventional trans-Z-source/-quasi-Z-source inverters. To verify the performance
of the improved converter, a laboratoryprototype was constructed based on aTMS320F2812 digital signal processor with 100Vdc input and 115 Vrms output voltage. (Index
Sequences on Dead-BeatPredictive Direct PowerControl of ReversibleThree-Phase Grid-Connected Voltage-Source
Converters
Abstract—This paper presents a dead-beat
predictive direct power control (DPC) strategyand its improved voltage-vector sequences forreversible three-phase grid-connected voltage-source converters (VSCs). The instantaneousvariation rates of active and reactive powers,
by applying each converter voltage vector in 12different sectors, are deduced and analyzed.Based on the power variation rates, it is foundthat the values of the predicted duration times
for the two conventional active converter voltagevectors are less than zero when the grid-connected VSC operates as either a rectifier oran inverter. In order to solve this issue, twonew alternative vector sequences are proposed
and compared. Experimental results on a 1.5kW reversible grid-connected VSC system arepresented to validate the feasibility of theproposed voltage-vector sequences on the
dead-beat predictive DPC strategy. (Index Terms—Dead-beat, direct power control(DPC), duration time, predictive, vector
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(DM) electromagnetic interference (EMI) noiseof a single-phase boost power factor correctionconverter operating in critical current mode wasanalyzed. The DM noise spectra are calculatedbased on the mathematicalmodel of EMI
receiver and the required corner frequencies ofDM filter are obtained. It can be seen that theminimum corner frequencies are determined bythe maximum noises at 150 kHz. With the
relation between the magnitude of the inductorcurrent ripple and theDMnoise, the characteristics of noise at 150 kHz are obtainedby analyzing the current ripple magnitude at150 kHz; thus, the worst conditions which have
the maximum noise value are figured out.Meanwhile, the maximum noises at 150 kHz for different input voltages are identical, so theDM filter can be designed based on one worstspectrum at one input voltage without testing the
spectra in other conditions. (Index Terms—Boost converter, critical current mode (CRM),differential mode (DM), electromagneticinterference (EMI), power factor correction
(PFC).)
IEEE 2013
PE48 Integration and Operationof a Single-PhaseBidirectional Inverter With
Two Buck/Boost MPPTsfor DC-DistributionApplications
Abstract—This study is focused on integrationand operation of a single-phase bidirectional inverter with two buck/boost maximum power
point trackers (MPPTs) for dc-distributionapplications. In a dc-distribution system, abidirectional inverter is required to control thepower flow between dc bus and ac grid, and toregulate the dc bus to a certain range of
voltages.Adroop regulation mechanismaccording to the inverter inductor current levelsto reduce capacitor size, balance power flow,and accommodate load variation is proposed.Since the photovoltaic (PV) array voltage canvary from 0 to 600 V, especially with thin-filmPV panels, the MPPT topology is formed withbuck and boost converters to operate at thedc-bus voltage around 380 V, reducing the
voltage stress of its followed inverter.Additionally, the controller can online check the
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input configuration of the two MPPTs, equallydistribute the PV-array output current to thetwoMPPTs in parallel operation, and switch control laws to smooth out mode transition. A
comparison between the conventionalboostMPPT and the proposedbuck/boostMPPT integrated with a PV inverteris also presented. Experimental results obtainedfroma 5-kW system have verified the
discussion and feasibility. (Index Terms—Bidirectional inverter, buck/boost maximumpower point trackers (MPPTs), dc-distribution
applications.)
PE49 Interleaved BoundaryConduction Mode (BCM)Buck Power FactorCorrection (PFC)
Converter
Abstract—An interleaved boundary conductionmode powerfactor- correction buck converter that maintains high efficiency across entire loadand line range is proposed. The adaptive
master– slave interleaving method maintainsstable 180◦ out-of-phase operation during anytransient. By interleaving two parallel-connected buck converters, the input currentripple is halved while the ripple frequency is
doubled, which leads to a smaller differential mode line filter. The line current harmonicdistortion is analyzed to examine the allowableoutput voltage range while meeting harmonicregulations. The operation and performance of
the proposed circuit is verified on a 300 W, universal line experimental prototype with 80 Voutput. The measured efficiencies remain above96% down to 20% of full load across the entire
universal line range. Even at 10% of full-loadcondition, the efficiency remains above 94%.The input current harmonics also meet theIEC61000-3-2 (class D) standard. (Index Terms—Boundary conduction mode (BCM),
buck converter, interleaving, power factorcorrection (PFC).)
IEEE 2013
PE50 Light-Load EfficiencyImprovement in Buck-
Derived Single-StageSingle-Switch PFC Converters
Abstract—Single-stage single-switch ac/dcconverters with power factor correction (PFC)
generally have higher power losses under alight-load condition, as compared to that of thetwo-stage approach, due to the sharing of acommon power transistor such that the PFC
stage cannot be switched OFF separately to
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problem by using a buck topology for the PFCstage of the single-stage single-switchconverters as it can be completely turned OFFby operating the converter only near the zero
crossing of the input voltage, due to thepresence of the dead angle of input current.Hence, the switching and conduction losses tothe transistor and diodes, and passive devicesare reduced. Also, further improvement is made
by finding the best combination of dc-buscapacitor charging time and discharging time toachieve the lowest power loss. A recentlyproposed converter topology which combines
a buck PFC cell with a buck–boost dc/dc cell isused as an example. Experimental results arereported and confirmed that the proposed light-load power loss reduction scheme on theconverter can improve power stage efficiency
by up to 7% at 1 W of output power ascompared to that without the proposedscheme. (Index Terms—Light-load efficiency,power consumption, Power factor correction, single-stage.)
PE51 Light-to-Light: PV-FedLED Lighting Systems
Abstract—This paper discusses the principle ofoperation, dynamic modeling, and control design for light-to-light (LtL) systems, whose aimis to directly convert the sun irradiation into
artificial light. The system discussed in this paperis composed by a photovoltaic (PV) panel, anLED array, a dc–dc converter dedicated to themaximum power point tracking of the PV panel
and a dc–dc converter dedicated to drive theLEDs array. A system controller is also included, whose goal is to ensure the matchingbetween the maximum available PV power andthe LED power by means of a low-frequency
LEDs dimming. An experimental designexample is discussed to illustrate thefunctionalities of the LtL system. (Index Terms—LED lighting, maximum power point tracking,PV systems.)
IEEE 2013
PE52 Mitigation of LowerOrder Harmonics in a Grid-Connected Single-Phase
Abstract—In this paper, a simple single-phasegrid-connected photovoltaic (PV) inverter topology consisting of a boost section, a low-
IEEE 2013
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PV Inverter voltage single-phase inverter with an inductivefilter, and a step-up transformer interfacing the
grid is considered. Ideally, this topology will notinject any lower order harmonics into the griddue to high-frequency pulse width modulationoperation. However, the nonideal factors in the
system such as core saturation-induced distorted magnetizing current of the transformerand the dead time of the inverter, etc.,contribute to a significant amount of lower orderharmonics in the grid current. A novel design of
inverter current control that mitigates lowerorder harmonics is presented in this paper. Anadaptive harmonic compensation technique andits design are proposed for the lower orderharmonic compensation. In addition, a
proportional-resonant-integral (PRI) controllerand its design are also proposed. This controllereliminates the dc component in the controlsystem, which introduces even harmonics in the
grid current in the topology considered.Thedynamics of the system due to the interactionbetween the PRI controller and the adaptivecompensation scheme is also analyzed. Thecomplete design has been validated with
experimental results and good agreement withtheoretical analysis of the overall system isobserved. (Index Terms—Adaptive filters,harmonic distortion, inverters, solar energy.)
PE53 Modeling and Simulationof All-Electric Ships WithLow-Voltage DC HybridPower Systems
Abstract—DChybrid power systems are ofinterest for future low emission, fuel-efficient vessels. In spite of the advantages they offeronboard a ship, they result in a complex,
interconnected system, which requires effectiveanalysis tools to enable a full realization of theadvantages. Modeling and simulation are essential tools to facilitate design, analysis, andoptimization of the system. This paper reviews
modeling of hybrid electric ship components including mechanical and electrical elements.Power electronic converters are modeled bynonlinear averaging methods to suit system-level
studies. A unified model for bidirectionalconverters is proposed to avoid transitions between two separate models. A simulation
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10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
platform using the derived models is developedfor the system-level analysis of hybrid electricships. Simulation results of power sharing
among two diesel generators, a fuel cell module, and an energy storage system arepresented for three modes of operation. (Index Terms—DC distribution systems, modeling,simulation, transportation.)
PE54 Multilevel DC-LinkInverter and ControlAlgorithm to Overcome thePV Partial Shading
Abstract—This letter presents for the first timethe application of multilevel dc-link inverter toovercome the problem of partial shading ofindividual photovoltaic (PV) sources which are
connected in series. The “PV permutation algorithm,” as a new method, is developed forthe control of the inverter so as to extract themaximum power form each PV source under
partial shading and to deliver all that power tothe load. The algorithm is based on combination of the direct pulsewidth modulation, thesequential permutation PV sources, and theoutput generation to control the multilevel dc-link
inverter. The algorithm is applied successfully toa seven-level inverter with separate maximumpower point tracking algorithm for each PVsource and under nonuniform irradiance (partial
shading). Digital processing unit F28335 eZdsp is used to control the PV system in the real-timemode, and MATLAB–Simulink real-time dataexchange is employed to display the extractedpower and to control the system parameters via
a designed graphical user interface window. The implementation and experimental results arepresented. (Index Terms—Maximum power
point tracking (MPPT), multilevel inverter,photovoltaic partial shading, real-time data
Abstract—This paper proposes amodel of themutual impedance between ring-type coils usedin domestic induction hobs. Recent
developments in these appliances have focused on flexible cooking surfaces, includingadjustable-size or total-active surfaces. Flexiblecooking surfaces are implemented by means ofseveral small ring-type closely arranged coils,
IEEE 2013
10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
each one supplied by a resonant inverter. Thebasic winding is a ring-type circular small coil,whose self-impedance has been reportedpreviously. In this paper, the coupling between
coils in terms of impedance is derived. Thecoils are modeled as axisymmetric current density distributions with parallel revolution axes.The mutual impedance between the coils isobtained considering two media representing the
load and the ferrite, respectively. Experimentalmeasurements have been performed to validatethe results. (Index Terms—Frequency-dependent impedance, home appliances,
Instability in a Three-PhaseBoost Rectifier Connectedto a Nonideal Power GridWith an Interacting Load
Abstract—Three-phase voltage source
converters (VSCs) are commonly used toconvert ac power from a three-phase grid to aregulated dc voltage with unity input powerfactor. The control of the VSC is normallyachieved by an outer voltage feedback loop and
a sinusoidal pulsewidth-modulated inner currentloop. However, the nonideal power grid andthe presence of other interacting loads give riseto nonlinear operation and drive the VSC toenter an irreversible instability region. In this
paper, an irreversible bifurcation phenomenon ina three-phase VSC connected to a power gridwith an interacting load is reported. Theconverter can also be regarded as exhibiting a
catastrophic bifurcation in which the inputcurrent expands to impose undesirablecomponent stress. A large-signal analysis isadopted to identify the physical origin of thephenomenon and to locate the boundary of the
instability. Experimental results on a 4-kVAac/dc converter prototype provide verificationof the instability phenomenon. (Index Terms—Bifurcation, instability, power grid, three-phasevoltage source converter (VSC).)
IEEE 2013
PE57 Novel Energy ConversionSystem Based on aMultimode Single-LegPower Converter
Abstract—This paper presents a novel powerconversion topology for systems, which include a boost and bidirectional converters to controlthe power flows between sources, batteries,
IEEE 2013
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(multimode single-leg power converter)substitutes the boost converter and bidirectional converter with a multifunctional bidirectionalconverter and has cost effectiveness and fault
tolerance, preserving the same energyconversion functionalities of the conventionalenergy conversion system. To verify the performance of the proposed system, itsoperations are categorized and explained to
four different modes. Then, each mode of theproposed system is simulated and implementedexperimentally using a prototype test bed. The results present that the proposed conversion
system is feasible and applicable for a widerange of applications includingalternative/renewable power systems andelectric vehicles (EVs).(Index Terms—Bidirectional converter, energy conversion,
hybrid vehicles, renewable energy.)
PE58 Origin of Cross-CouplingEffects in Distributed DC–DC Converters in
Photovoltaic Applications
Abstract—Long strings of photovoltaic (PV)modules are found to be vulnerable to shading effects, causing significant reduction in the system
power output. To overcome this, distributedmaximum power point-tracking (DMPPT)schemes have been proposed, in whichindividual dc–dc converters are connected toeach PV module to enable module-wise
maximum power extraction. There are twomain concepts to implementDMMPTsystems: seriesand parallel configuration, describing theconnection of the output terminals of the
converters. Both systems are studiedintensively, with innovative solutions toencountered operational challenges and novelcontrol methods. However, a comprehensivedynamic model for neither system has been
presented so far. This paper fills the gap by presenting small-signal models for bothconfigurations, explaining the observedoperational peculiarities. The analytical claimsare verified with a practical system comprising
two maximum power point-tracking buck–boost converters. (Index Terms—Cascadedconverters, dc–dc power conversion,
IEEE 2013
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PE59 Perturbation On-Time(POT) Technique in PowerFactor Correction (PFC)Controller for Low TotalHarmonic Distortion and
High Power Factor
Abstract—The proposed perturbation on-timetechnique suppresses total harmonic distortion (THD) and, thus, improves the power factor inthe power factor correction (PFC) controller.Besides, the adaptive control of the minimum off
time by the proposed inhibit time control canimprove efficiency even at lowac input voltage.Therefore, highly integrated PFC converterfabricated in the TSMC 800-V ultrahigh
voltage process can achieve low THD of 6%,high PF of 99%, and high efficiency of 95% atthe output power of 90W. (Index Terms—Inhibit time (IT) control, nonnegative-voltagezero current detector (NNV-ZCD),
perturbation on time (POT), power factorcorrection (PFC), ultrahigh voltage (UHV).)
IEEE 2013
PE60 Precise AcceleratedTorque Control for Small
Inductance Brushless DCMotor
Abstract—In this paper, precise acceleratedtorque control for a small inductance brushless
dc motor (BLDCM) is achieved byelectromagnetic torque control and disturbancetorque suppression. First, the electromagnetictorque ripple is reduced in commutation andconduction regions. In the former region, the
ripple is suppressed by overlapping commutationcontrol and optimizing the duty ratio of theactive controller. In the latter region, theunbalance ripple caused by the unbalanced
three phase windings is reduced by the proposed asymmetry compensation function,and the disturbance ripple created by the backelectromotive force (EMF) is compensated byfeedforward control. Second, the disturbance
torque has been observed and compensatedthrough the improved disturbance torquecontroller whose compensation coefficient is obtained by line-to-line back EMF coefficientestimation. And, both the disturbance
observation and speed measurement are allsynchronized with the encoder pulse alteration.Experimental results are presented todemonstrate the validity and effectiveness of the
proposed accelerated torque control scheme. (Index Terms—Accelerated torque,brushless dc motor (BLDCM), disturbance
IEEE 2013
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PE61 Problems Incurred in aVector-Controlled Single-Phase Induction Motor,and a Proposal for a
Vector-Controlled Two-Phase Induction Motor as aReplacement
Abstract—This paper presents several of theproblems encountered with vector-controlled single-phase induction motor (SPIM), anddiscusses about the complex implementation of
a vector controlled SPIM drive. The vector-controlled symmetrical two-phase inductionmotor (TPIM) is presented as a viablereplacement for the vector-controlled SPIM.
The implementation of the proposed vector-controlled TPIM is simple compared to thevectorcontrolled SPIM. All the TPIMparameters can be calculated simply andprecisely. The proposed strategy for TPIM is
derived from the indirect vector control strategyused for three-phase ac machines. Severaldifferences between the vector control strategies for the TPIM and for three-phase ac
motor are discussed. The validity of theproposed vector-controlled TPIM was verifiedby simulations and experiments. (Index Terms—Vector-controlled single-phase inductionmotor (SPIM), vector-controlled two-phase
induction motor (TPIM), unsymmetrical motor.)
IEEE 2013
PE62 Reconfigurable SolarConverter: A Single-StagePower Conversion PV-
Battery System
Abstract—This paper introduces a newconverter called reconfigurable solar converter(RSC) for photovoltaic (PV)-battery
application, particularly utility-scale PV-batteryapplication. The main concept of the newconverter is to use a single-stage threephasegrid-tie solar PV converter to perform dc/ac and dc/dc operations. This converter solution is
appealing for PV-battery application, becauseitminimizes the number of conversion stages,thereby improving efficiency and reducing cost,weight, and volume. In this paper, a
combination of analysis and experimental tests isused to demonstrate the attractive performancecharacteristics of the proposed RSC. (Index Terms—Converter, energy storage, photovoltaic(PV), solar.)
IEEE 2013
PE63 Series Asymmetrical Half-Bridge Converters WithVoltage Autobalance for
Abstract—In this paper, an isolated seriesasymmetrical halfbridge converter (SA-HBC) is proposed to satisfy the high power and high
IEEE 2013
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input-voltage requirements. In the proposedconverter, two half-bridge modules with seriesconfiguration are adopted in the primary side toreduce the switch voltage stress to half of the
input voltage.Moreover, the series half-bridgecells share the same transformer and leakageinductance, which simplifies the circuit structure. Zero-voltage-switching transition is achievedfor all the active switches by employing the
asymmetrical control scheme to reduce theswitching losses. Furthermore, the voltages ofthe input capacitors are automatically balanced without any additional components or complex
control methods. In addition, a family of dc–dcconverters with series half-bridge structure isexplored to give a universal discussion andextensive applications of the proposed contributions for the high input-voltage systems.
Finally, a 500–600-V input 48-V output 1-kWprototype operating with 100 kHz switchingfrequency is built and tested to demonstratethe effectiveness of the proposed SA-HBCconverter. The efficiency of 95% at full load is
realized. (Index Terms—High voltageapplications and voltage autobalance ability,series asymmetrical half-bridge converter (SA-HBC).)
PE64 Soft-Switching DC/DC
Converter With a Full ZVSRange and Reduced OutputFilter for High-VoltageApplications
Abstract—Anew soft-switching dc/dc
converter, which can solve the drawbacks ofexisting phase-shifted full-bridge converterssuch as narrow zero-voltage-switching (ZVS)range, large circulating current, large duty-cycleloss, and a large output filter in highvoltage
applications, is proposed in this paper. The proposed converter is composed of twosymmetric half-bridge inverters that are placedin parallel on the primary side and are driven in a
phase-shifting manner to regulate the outputvoltage. At the rectifier stage, two full-bridgerectifiers sharing two low-current-rating diodesare employed. This structure allows theproposed converter to have the advantages of a
full ZVS range, no problems related to duty-cycle loss, no circulating current, and asignificantly reduced output filter. In this paper,
IEEE 2013
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and relevant analysis results of the proposedconverters are presented. Experimental resultson a prototype converter realized with thespecification of 80-in plasma display panel
sustain power module (320–385 Vdc input, 205Vdc /5 A output) validate the theoreticalanalysis. (Index Terms—No circulating current,no duty-cycle loss, phaseshift, zero-voltage switching (ZVS).)
PE65 Space-Vector-Modulated Three-Level Inverters Witha Single Z-Source Network
Abstract—The Z-source inverter is a relativelyrecent converter topology that exhibits bothvoltage-buck and voltage-boost capability. TheZ-source concept can be applied to all dc-to-
ac, acto- dc, ac-to-ac, and dc-to-dc powerconversion whether two-level or multilevel. However, multilevel converters offer manybenefits for higher power applications. Previouspublications have shown the control of a Z-
source neutral point clamped inverter using thecarrier-based modulation technique. This paperpresents the control of a Z-source neutral pointclamped inverter using the space vector
modulation technique. This gives a number ofbenefits, both in terms of implementation andharmonic performance. The adopted approachenables the operation of the Z-sourcearrangement to be optimized and implemented
digitally without introducing any extracommutations. The proposed techniques aredemonstrated both in simulation and through experimental results from a prototypeconverter. (IndexTerms—Buck–boost, neutral
point clamped inverter, space vector modulation(SVM), Z-source inverter.)
IEEE 2013
PE66 Synchronous-Reference-Frame-Based Control ofSwitched Boost Inverter forStandalone DC NanogridApplications
Abstract—Switched boost inverter (SBI) is asingle-stage power converter derived fromInverse Watkins Johnson topology. Unlike thetraditional buck-type voltage source inverter(VSI), the SBI can produce an ac output voltage
that is either greater or less than the availabledc input voltage. Also, the SBI exhibits betterelectromagnetic interference noise immunitywhen compared to the VSI, which enablescompact design of the power converter. Another
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advantage of SBI is that it can supply both dcand ac loads simultaneously from a single dc
input. These features make the SBI suitable fordc nanogrid applications. In this paper, the SBIis proposed as a power electronic interface in dc nanogrid. The structure and advantages of the
proposed SBI-based nanogrid are discussed indetail. This paper also presents a dqsynchronousreference- frame-based controllerfor SBI, which regulates both dc and ac busvoltages of the nanogrid to their respective
reference values under steady state as well asunder dynamic load variation in the nanogrid.The control system of SBI has beenexperimentally validated using a 0.5-kWlaboratory prototype of the SBI supplying both
dc and ac loads simultaneously, and the relevant experimental results are given in this paper. Thelow cross regulation and the dynamicperformance of the control system have also
been verified experimentally for a 20% stepchange in either dc or ac load of SBI. These experimental results confirm the suitability of theSBI and its closed-loop control strategy for dcnanogrid applications. (Index Terms—DC
tool for a solar energy harvesting IC and system is developed with visual basic software,and the synthesis tool employed in thisapproach can be used to shorten the design timeto market. In addition, a smart meter system is
developed to measure the solar energy harvesting system’s information with an onlinesystem. Users can thus get the proposedsystem’s information at any time and from
anywhere. Finally, good agreement has beenfound between the analytic and experimentalresults. (Index Terms—Digital-to-analogconverter (DAC), energy harvesting, pulsewidth modulation (PWM).)
IEEE 2013
PE68 The TAIPEI Rectifier—ANew Three-Phase Two-Switch ZVS PFC DCM
Abstract—A new, three-phase, two-switch,power-factorcorrection (PFC) rectifier that can achieve less than 5% inputcurrent total harmonic
IEEE 2013
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Boost Rectifier distortion (THD) and features zero-voltageswitching (ZVS) of all the switches over theentire input-voltage and load ranges is
introduced. The proposed rectifier also offersautomatic voltage balancing across the twooutput capacitors connected inseries,whichmakes it possible to usedownstreamconverters designed with lower
voltage-rated component that offer betterperformance and are less expensive than theirhigh-voltage-rated counterparts. In addition, the proposed rectifier also exhibits low common-
mode EMI noise. The performance of theproposed rectifier was evaluated on a 2.8-kWprototype with a 780-V output that wasdesigned to operate in 340–520-VL-L,RMSinput-voltage range. (Index Terms—Boost
(TLM) for High Reliabilityand Efficiency in a PowerFactor Correction (PFC)System
Abstract—The proposed triple loop
modulation (TLM) can ensure reliability of thepower factor correction (PFC) system due tothe improvement of transient response. Inconventional design, low bandwidth of less than20Hz that rejects ac source of 60/120 Hz
coupling deteriorates system reliability in case of output load variation. Contrarily, theproposedTLMcan automatically adjust bandwidth to rapidly increase or decrease
inductor current to shorten transient responsetime. Besides, in the steady state, system stabilitycan be guaranteed by low-frequencycompensation pole without being affected by the TLM. The test circuit fabricated in a VIS
500 V UHV laterally diffused metal–oxide–semiconductor transistor process demonstratesthat the highly integrated PFC controller withthe proposed TLM has high power factor of
99%, high efficiency of 95%, and high powerdriving capability of about 90 W. The improvement in transient response is twofoldfaster than in conventional PFC design withoutput load variation from 90 to 20W and vice
versa. (Index Terms—Fast transient response,
IEEE 2013
10/3/13 IEEE 2013 -2012 projects in power electronics, 2013 ieee projects in power electronics, IEEE 2013 power electronics project titles | IEEE projects 2013 - 20…
PE70 Unterminated Small-SignalBehavioral Model of DC–
DC Converters
Abstract—The “black-box” modeling of dc–dcconverters has always been an attractive topic
widely used in engineering practice. However, inorder to obtain unterminated model of dc–dcconverter, the one had to be removed from theoriginal environment and connected to the high-
bandwidth voltage source and current sink foreasier decoupling of the source and the loaddynamics. This paper addresses an online dc–dc converter characterization procedurewhereconverter under test can remainworking in the
original environment, at the particular operatingpoint, and be connected to any type of thesource and the load while the terminatedfrequency response characteristics are obtained.The source and the load dynamics can then be
decoupled from the measured frequency responses using here proposed lineartransformation matrix. The verification andvalidation of the proposed technique will be both
presented in this paper. (Index Terms—Behavioral model, dc power systems,decoupling, electronic power converters, un-terminated transfer functions.)
IEEE 2013
PE71 Γ-Z-Source Inverters Abstract—Voltage-type Γ-Z-source invertersare proposed in this letter. They use a unique Γ-shaped impedance network for boosting their
output voltage in addition to their usualvoltagebuck behavior. Comparing them with
other topologies, the proposed inverters uselesser components and a coupled transformer for
producing the high-gain and modulation ratio
simultaneously. The obtained gain can be tunedby varying the turns ratio γΓZ of the transformer
within the narrow range of 1 < γΓZ ≤ 2. Thisleads to lesser winding turns at high gain, as
compared to other related topologies.
Experimental testing has already proven thevalidity of the proposed inverters. (Index Terms
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