S.R Aali - Electrical Engineering Department, Urmia University, Urmia, Iran
B Tousi - Electrical Engineering Department, Urmia University, Urmia, Iran
D Nazarpour - Electrical Engineering Department, Urmia University, Urmia, Iran

Custom Power devices such as DVR and DSTATCOM are used in order to improve power quality in distribution systems. It is required to provide the real power for these devices to compensate deep voltage sag for sufficient time. Interline Dynamic Voltage Restorer is consists of several DVRs in different feeders. In this paper, for mitigation voltage sags, swell, unbalance, voltage flicker, reduction harmonics of injected voltage and improve dynamic performance, a fuzzy system is proposed to control the IDVR performance. The control strategy of the fuzzy controller is replaced by the conventional strategies. The novel control method is implemented by using a fuzzy logic system and a carrier modulated PWM inverter. Simulation is carried out by Matlab/Simulink and it demonstrates that the proposed controller has quick response with lower THD.

IDVR, Fuzzy Logic Controller, Voltage Sag,Fast Response, THD