International Journal of Emerging Technology in Computer Science & Electronics (IJETCSE) ISSN: 0976-1353 Volume 22 Issue 2 – MAY 2016. 143 Abstract— This paper proposes the concept of Paralleling of four leg Shunt Active Power Filter (SAPF) in order to compensate the four wire electrical network without disturbing the others Performance. A New Control Strategy of Space Vector Pulse Width Modulation (SVPWM) is introduced for an effective Operation of SAPF in Distribution Side. Fuzzy Logic Controller (FLC) is used to maintain the same Amplitude and Frequency of each inverter output. Both Fuzzy Logic Controller (FLC) and Space Vector Modulation (SVM) together provides robustness, Reactive Power Compensation, DC Voltage Stabilization and also used to minimizing the Source Current Harmonics, reducing the magnitude of Neutral Current, eliminating the Zero-Sequence Current, reducing the Switching Losses. Analysis of mentioned devices includes theoretical calculations and simulations performed in MATLAB/Simulink software. Index Terms—Shunt Active Power Filter (SAPF), Harmonic Elimination, Paralleling of SAPF, Space Vector Modulation (SVM), Fuzzy Logic Controller (FLC). I. INTRODUCTION Harmonic voltages and currents present in an electrical power system are a result of non-linear electric loads. Harmonic frequencies are the major cause of power quality problems in the power grid [1]. Harmonics in power systems results in increased heating effect in both an equipment and conductors, misfiring in variable speed drives, and torque pulsations in motors. When a non-linear load, for example a rectifier, is connected to the system, it draws an unequal current that is not necessarily sinusoidal. According to the type of load and its interaction with other equipments of the system, the current waveform will get distorted. Even though it is very complex the current waveform becomes, as described through Fourier series analysis, it is possible to split it into a number of simple sinusoids, which start at the power system fundamental frequency and occurs at integer multiples of the fundamental frequency (50 Hz). With increasingly higher density of loads basing on rectifiers and switched mode power supplies, harmonic content in supply networks becomes widely discussed and analyzed. This leads to current harmonics mitigation devices application. Historical approach to mitigate an harmonic current based on passive power filters. Semiconductor switches development allowed researchers and engineers to introduce more sophisticated devices offering much higher accuracy active power filters as shown in Fig.1. As the effectiveness of these devices is in most cases more than sufficient, the problem with their application is related with their significant costs, especially for compensation of industrial loads harmonic currents. In this paper an approach to reduce transistor current and voltage rating is based on installing additional passive power filter. Proposed passive power filter is tuned to mitigate 5 th and 7 th harmonic current expected highest amplitude harmonic orders [2]. As highest harmonic currents are compensated by the passive power filter, required converter power rating is reduced. The potential benefits of paralleled VSI systems have led to the investment of considerable development effort. Many of the early systems were passive in nature, relying entirely on incidental load balancing actions in combination with standard control methods, sometimes combined with output filter impedances, to keep the circulating current within reasonable limits. These systems are still widely employed due to their simplicity and robust nature; however their poor performance with respect to load sharing demands significant concessions are made during the design process. PARALLELING OF FOUR-LEG SHUNT ACTIVE POWER FILTERS BASED ON SVPWM USING FUZZY LOGIC CONTROL 1 G.Shobana*, 2 Dr. R.Arivalahan # * PG Scholar, # Associate Professor Department of Electrical and Electronics Engineering Valliammai Engineering College, Kattankulathur-603 203, Tamilnadu, India. [email protected], [email protected]Three Phase Source Harmonic Loads Shunt Active Power Filter I S I L I F V pcc
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International Journal of Emerging Technology in Computer Science & Electronics (IJETCSE)
ISSN: 0976-1353 Volume 22 Issue 2 – MAY 2016.
143
Abstract— This paper proposes the concept of Paralleling of
four leg Shunt Active Power Filter (SAPF) in order to
compensate the four wire electrical network without disturbing
the others Performance. A New Control Strategy of Space Vector
Pulse Width Modulation (SVPWM) is introduced for an effective
Operation of SAPF in Distribution Side. Fuzzy Logic Controller
(FLC) is used to maintain the same Amplitude and Frequency of
each inverter output. Both Fuzzy Logic Controller (FLC) and
Space Vector Modulation (SVM) together provides robustness,
Reactive Power Compensation, DC Voltage Stabilization and also
used to minimizing the Source Current Harmonics, reducing the
magnitude of Neutral Current, eliminating the Zero-Sequence
Current, reducing the Switching Losses. Analysis of mentioned
devices includes theoretical calculations and simulations
performed in MATLAB/Simulink software.
Index Terms—Shunt Active Power Filter (SAPF), Harmonic
Elimination, Paralleling of SAPF, Space Vector Modulation
(SVM), Fuzzy Logic Controller (FLC).
I. INTRODUCTION
Harmonic voltages and currents present in an electrical
power system are a result of non-linear electric loads.
Harmonic frequencies are the major cause of power quality
problems in the power grid [1]. Harmonics in power systems
results in increased heating effect in both an equipment and
conductors, misfiring in variable speed drives, and torque
pulsations in motors. When a non-linear load, for example
a rectifier, is connected to the system, it draws an unequal
current that is not necessarily sinusoidal. According to the
type of load and its interaction with other equipments of the
system, the current waveform will get distorted. Even though
it is very complex the current waveform becomes, as
described through Fourier series analysis, it is possible to split
it into a number of simple sinusoids, which start at the power
system fundamental frequency and occurs at integer multiples
of the fundamental frequency (50 Hz). With increasingly
higher density of loads basing on rectifiers and switched mode
power supplies, harmonic content in supply networks becomes
widely discussed and analyzed. This leads to current
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