Dept. of Electrical Engineering, Institute of Technology, Sepuluh Nopember, Indonesia.
Dept. of Computer Science and Electrical Engineering, Kumamoto University, Japan.
Many research were proposed to minimize the number of fuzzy membership function, one of them is fuzzy polar controller method. By using this method, the number of membership function can be minimized. This paper proposed the Dynamic Voltage Restorer based on Fuzzy Polar Control Scheme and blocking zero sequence to compensate both balanced and unbalanced voltage sags. Delta to star connection transformer is used in this system, therefore the zero sequence component does not appear on the load side. The d and q components of the line voltages are converted to polar coordinate. The Simulation results show that the proposed method compensates both balanced and unbalanced voltage sags better than PI controller. Averaged error by fuzzy polar controller is 2.6% and by PI controller is 4.9%.
Voltage sag, DVR, fuzzy polar
