Pi & Fuzzy Logic Controller Based Multi Converter Unified Power Quality Conditioner
B. Rajani1, P. Sangameswara Raju2
1B.Rajani, Pursuing Ph.D., Department of Electrical & Electronics Engineering, S.V. University, Tirupathi, Andhra Pradesh, India.
2Dr. P. Sangameswarararaju, Professor, Department of Electrical & Electronics Engineering, S.V. University. Tirupati, Andhra Pradesh, India.
Manuscript received on May 17, 2012. | Revised Manuscript received on June 15, 2012. | Manuscript published on June 30, 2012. | PP: 208-212 | Volume-1 Issue-5, June 2012. | Retrieval Number: E0474061512/2012©BEIESP
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Abstract: A new unified power-quality conditioning system (MC-UPQC) , is proposed in this paper as a new custom power device for a two-bus/two-feeder distribution system. The response of the Multi converter unified power quality conditioner, for different types of controllers are studied. This paper capable of simultaneous compensation for voltage and current in multibus/multifeeder systems. In this configuration, one shunt voltage-source converter (shunt VSC) and two or more series VSCs exist. The system can be applied to adjacent feeders to compensate for supply-voltage and load current imperfections on the main feeder and full compensation of supply voltage imperfections on the other feeders. In the proposed configuration, all converters are connected back to back on the dc side and share a common dc-link capacitor. Therefore, power can be transferred from one feeder to adjacent feeders to compensate for sag/swell and interruption. In order to regulate the dc-link capacitor voltage, Conventionally, a proportional controller (PI) is used to maintain the dc-link voltage at the reference value. The transient response of the PI dc-link voltage controller is slow. So, a fast acting dc-link voltage controller based on the energy of a dc-link capacitor is proposed. The transient response of this controller is very fast when compared to that of the conventional dc-link voltage controller. By using fuzzy logic controller instead of the PI controller the transient response is improved. The detailed simulation studies are carried out to validate the proposed controller. The performance of the proposed configuration has been verified through simulation studies using MATLAB/SIMULATION on a two-bus/two-feeder system.
Keywords: Power quality (PQ),MATLAB/SIMULATION unified power-quality conditioner (UPQC), voltage-source converter (VSC), fuzzy logic controller.