Different control strategies for Unified Power Quality Conditioner at load side

This paper presents the compensation principle using PI, FUZZY & ANN control strategies of the UPQC in detail. The UPQC is an Active Filter (AF) and it compensates the reactive power, harmonics in both the voltage and current caused by loads. The UPQC makes use of two back to back connected IGBT based Voltage Source Inverters (VSIs) with a common dc bus. One inverter is connected in series and the other one is placed in shunt with the load. The shunt inverter works as a current source and it compensates the current harmonics. The series inverter works as a voltage source and it helps in compensating the voltage harmonics. Previous works presented a control strategy for shunt active filter with PI control. Then, this control straregy was extended to develop the three different controllers for shunt and series active filters. The simulation results of these control strategies are listed for comparison and verification of results.