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A Versatile Control Scheme for a Dynamic Voltage Restorer for Powe1

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This paper presents a control system based on a repetitive controller to compensate for key power-quality disturbances, namely voltage sag, harmonic voltages, and voltage imbalances, using a dynamic voltage restorer (DVR). The control scheme deals with all three disturbances simultaneously within a bandwidth. The control structure is quite simple and yet very robust; it contains a feed forward term to improve the transient response and a feedback term to enable zero error in steady state. The well-developed graphical facilities available in PSCAD/EMTDC are used to carry out all modeling aspects of the repetitive controller and test system. Simulation results show that the control approach performs very effectively and yields excellent voltage regulation.
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  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   A Versatile Control Scheme for a Dynamic Voltage Restorer for Power-Quality Improvement ABSTRACT: This paper presents a control system based on a repetitive controller to   compensate for key  power-quality disturbances, namely voltage sag, harmonic voltages, and voltage imbalances, using a dynamic voltage restorer (DVR). The control scheme deals with all three disturbances simultaneously within a bandwidth. The control structure is quite simple and yet very robust; it contains a feed forward term to improve the transient response and a feedback term to enable zero error in steady state. The well-developed graphical facilities available in PSCAD/EMTDC are used to carry out all modeling aspects of the repetitive controller and test system. Simulation results show that the control approach performs very effectively and yields excellent voltage regulation. KEYWORDS: 1.   Dynamic voltage restorer (DVR) 2.   harmonic distortion 3.    power quality (PQ) 4.   repetitive control 5.   voltage sag SOFTWARE: MATLAB/SIMULINK  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   BLOCK DIAGRAM:  Fig   . 1. Test system implemented in PSCAD/EMTDC.  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   SIMULATION RESULTS: Fig. 2. Three-phase rms voltage. (a) Across the sensitive load. Fi   g. 3. Line-to-line voltage. (a) At the PCC. (b) Across the (b) At the PCC. sensitive load. Corresponding to the interval (s): 0 < t < 0.2 Fig. 4. Detail of the spectrum of the line-to-line voltage.. Fig. 5. Line-to-line voltages at the PCC. Corresponding to the (a) At the PCC (b) Across the sensitive load. interval (s) 0.2 < = t < 0.28  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245   Fig. 6. Sensitive-load line-to-line voltages. Corresponding   Fig. 7. Control outputs. Corresponding to the interval (s) to the interval (s) 0.2 < = t < 0.28 0.2 < = t < 0.28  Fig. 8. Line-to-line voltage when the induction motor is connected. (a) At the PC. (b) Across the sensitive load. Corresponding to the interval (s) 0.4 < t < 0.65
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