SINGLE PHASE BIDRECTIONAL PWM CONVERTER FOR MICROGRID SYSTEM GUIDED BY Ms.SREELAKSHMI.C.S GROUP MEMBERS MRUDHULA.M.K NAIR.P.AKSHAY ROOPESH.R.NAIR VIVEK.K.P 6/28/22 FIRST REVIEW 1
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Monday, May 1, 2023
FIRST REVIEW
1
SINGLE PHASE BIDRECTIONAL PWM CONVERTER
FOR MICROGRID SYSTEM
GUIDED BYMs.SREELAKSHMI.C.S
GROUP MEMBERS
MRUDHULA.M.K
NAIR.P.AKSHAY
ROOPESH.R.NAIR
VIVEK.K.P
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FIRST REVIEW
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OBJECTIVE:-
Proposes a control system for single-phase bidirectional PWM converters for residential power level Microgrid systems which is robust.
Which can tolerate transitions between the different modes of operation. The Microgrid connected single phase Bidirectional PWM converter which operates in
Rectification and Inverting mode. This converter helps to connect renewable energy sources to loads as well as excess power
are given to power grid.
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INTRODUCTION:-
The existing electricity grid converts only one-third of fuel into electricity and 8% of its output is wasted across the transmission lines.
Smart grid technology basically derived from traditional power grid with some additional features such as reliability, efficiency and sustainability .
The conventional methods of power generation are affect the environment, causing an increase in greenhouse gas emissions.
These methods of generations have exceptional scale of economy, But it transmits power over long distances.
As a result, it has turn into the driving force for the growing interest in alternative energy.
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Distributed generation is one approach to the manufacture and transmission of electric power. In this generation the power is generated locally hence the transmission loss is reduced and
size and number of power line is also reduced. Microgrid is an accepted concept that consists of generating units and storage elements and
uses the naturally available alternate energy resources. The critical component for such a system is the ac/dc bidirectional, pulse width-modulation
(PWM) converter. That connects the ac and dc subsystems together and to the utility grid.
INTRODUCTION CONTINUES..
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5 MICROGRID BENIFITS
Provides power quality, reliability, and security for end users and operators of the grid.
Enhances the integration of distributed and renewable energy sources.
Cost competitive and efficient.
Locally controlled power quality.
Minimize carbon footprint and green house gas emissions by maximizing clean local energy generation.
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BLOCK DIAGRAM:-
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The bidirectional converter should operate in the following modes: 1) Inverter Mode 2) Rectifier Mode
Inverter Mode:-
If the dc side renewable energy is available converter operates as the
Inverter feeding power to the ac loads and dc loads directly get power from
renewable energy sources.
.
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Rectifier Mode In this mode the converter act as a full bridge inverter and LC filter is used to
get the sinusoidal output. If the dc side renewable energy is not available converter operates as the
rectifier feeding power to dc loads . AC side renewable energy resources provide power to AC loads. In this mode the converter act as a rectifier and provide DC output with less
ripple factor by using filter capacitor Cdc.
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CONTROL SYSTEM DESIGN:-
In recent years many control strategies have been developed for example hysteresis and predictive control ,fuzzy logic, sliding mode ,repetitive control and neural network.
In this methods each mode requires different control strategy which results difficulty in control system design and over all reliability of the system is reduced.
Therefore the Double loop PID control is proposed because of simple design, easy implementation and excellent performance.
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Before designing the control system, converter has to be modeled. The Average model of the full bridge inverter is given by the following equation (1) & (2)
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Since the double loop control is used, the current loop is used to regulate the inductor current and the voltage loop is used to regulate ac and dc voltage.
The current and voltage loop is designed separately. Transfer function for current and voltage loop can be obtained from the average model given by the equation (1) & (2).
Transfer function for common inner current loop,
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Transfer function for outer voltage loop, Inverter Mode
Rectifier Mode
The desired output for a closed loop system is obtained by tuning PID gain values
to the system inherent condition.
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13CIRCUIT DIAGRAM
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SIMULATION:- The control system is designed and simulated using MATLAB/simulink. . PARAMETER RANGE
Input voltage 230VVrms 230V
AC filter inductor 220e-6HAC filter capacitor 25e-6FDC filter inductor 500e-3HDC filter capacitor 7.5e-3F
Rdc 100ΩRac 20ΩLac 45.5e-3HCac 150e-6F
Switching frequency 25kHzVoltage sensor gain 0.01(Inverter)
0.03(Rectifier)Current sensor gain 0.06
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15CIRCUIT OPERATION
Inverter mode
In this mode the switches(IGBT) S3 and S4 are turned ON Current follows the path starting from the DC source.
The path is
K Is L1 S3 F RLC Parallel C2 L2 b T4 L I J
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16INVERTER MODE
SIMULATION DIAGRAM
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17 INVERTER OUTPUT
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18 CURRENT LOOP
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19 VOLTAGE LOOP
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20 PWM SWITCHING
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21RECTIFIER MODE
SIMULATION DIAGRAM
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22 VOLTAGE LOOP
CURRENT LOOP
• Current loop is same as the inverter mode.
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23 RECTIFIER OUTPUT
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APPLICATION:-
It helps to connect both DC and AC loads to a Microgrid system.
It helps to regulate ac and dc voltage.
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The Literature survey for the project was done. Current and voltage loop PID are designed. The simulation diagram for the Bi-directional converter in inverter mode is drawn. Varying peak amplitude is obtained. The voltage loop for rectifier is designed. The rectifier output with noise is obtained.
CONCLUSION:-
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Dong Dong, Timothy Thacker, Igor Cvetkovic, Rolando Burgos, Dushan Boroyevich, FredWang, and Glenn Skutt “Modes of Operation and System-Level Control of Single-Phase Bidirectional PWM Converter for Microgrid Systems”.
D. Dong, T. Thacker, R. Burgos, D. Boroyevich, F. Wang, and B.Giewont, “Control design and experimental of a multi-function single phase bidirectional PWM converter for renewable energy systems,”.
C.Kalavalli, K.ParkaviKathirvelu, R.Balasubramanian “Single Phase Bidirectional PWM Converter for Microgrid System.” International Journal of Engineering and Technology (IJET) Vol 5 No 3 Jun-Jul 2013
REFERENCE:-
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THANK YOU
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