Harmonic Compensation of Controlled Uncontrolled Loads by using Sahf

Abstract

In this paper ,three phase shunt active harmonic filter is used for harmonic compensation of controlled & uncontrolled loads by using phase locked loop techniques with new synchronized pulse generator. The circuit model consists of a standard shunt SAHF with IGBT inverter used for harmonic elimination of controlled & uncontrolled loads. PLL is used for generating a sinusoidal output & Synchronized pulse generator is used for giving firing pulse to controlled converter used as one of a Non-Linear load. The SAHF uses a PLL with adaptive filter to generate a reference sinusoidal source current which is in-phase with load current and has the same RMS gain as the load current. Hysteresis switching is used for Current control. In Hysteresis switching method, a hysteresis band is formed & within the band, the shunt line current tracks the reference current In this way Hysteresis Switching is used for producing the reference signal for the IGBT inverter & also the synchronized pulse generator is used for generating firing pulse for 3-phase controlled rectifier used as one of non-linear load.