Performance analysis of shunt active power filter using different switching signal generation techniques

Abstract

The performance of shunt active power filter (SAPF) for various pulse width modulation (PWM) control techniques associated for steady state load conditions. SAPF used for the elimination of harmonics from the supply current when the ac or dc type of the single phase nonlinear type of loads connected in the system. SAPF injecting the compensating current to equal and opposite current to create the source current sinusoidal and also supply the compensating current required by the nonlinear load. The active power filters have increased much more consideration because of its tremendous performance to moderate the harmonic and reactive power issues. SAPF with synchronous reference frame (SRF) theory has proposed for compensation of harmonics and the reactive power compensation. The various PWM techniques are used for comparing the source current Total Harmonic Distortion (THD). The switching signal generation techniques are Hysteresis Current Controller (HCC), Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) used for analyzing the system over all response, switching frequency and the percentage of THD of the SAPF. The switching frequency of the HCC is not fixed but in other two methods the switching frequencies are fixed. The switching loss of SVPWM is less compared with other two control techniques. For regulating voltage in SAPF, two controllers are used such as PI and fuzzy logic controllers for minimization of in which PI controller requires the mathematical model of the system but the fuzzy controller doesn’t required any mathematical model and it is user friendly tool to analyze the overall system performance. The percentage of THDs are compared aforesaid schemes and obtained less source current THD using SAPF and SVPWM with fuzzy control as compared to HCC-PI, HCC-Fuzzy, SPWM-PI, SPWM-Fuzzy, and SVPWM-PI. Also, the obtained source current THDs of all control schemes simulated performance in MATLAB are closer to within IEEE519 standards only.