Simulation and Experimental Realization of Adaptive
Controllers for Shunt Active Power Filter to improve
Power Quality

Abstract

As of late, the demand for electric power is increasing, which has developed a greater demand to maintain a higher level of power quality and continuity of power supply at the consumer end. But increased use of power electronic devices has imperatively degraded the overall power quality of the power system. Due to the non-linear nature of the power electronic devices various current and voltage harmonics are generated, causing harmonic
distortion. These harmonics cause various undesirable effects such as equipment heating, nuisance tripping, overheating transformer, data losses, etc. Shunt Active Power Filters are a viable solution to mitigate these harmonics and thus improve the power quality. In this thesis work, various control strategies of shunt active power filter based on voltage and current controller has been presented to mitigate the current harmonics. To extract the three phase reference source current we have developed control algorithm based on Synchronous reference frame theory (id-iq) and Self Tuning Filter. For regulating the DC capacitor bus voltage various voltage controllers such as PI, PID, Fuzzy and Adaptive Fuzzy PID controllers has been developed. While to generate the gate signal of SAPF multiple current controllers such as Hysteresis band current controller, adaptive hysteresis band current controller, weighted adaptive hysteresis band current controller and Lyapunov
function based stable current controller has been developed. To analyze their performance, simulation models of these controllers have been developed using Matlab/Simulink for different operating conditions. A complete hardware setup of the three phase shunt active
power filter has been developed using dSPACE 1104 to verify the credibility of the proposed controllers.