Enhancement of Active Power Filter Operational Performance using SRF Theory for Renewable Source

This paper presents the design of Synchronous Reference Frame theory (SRF) based on time domain reference signal elimination technique that can extract reference compensated current for 3ф shunt active power filter. A three-phase Voltage Source Converter (VSC) of this system eliminates harmonics current, balances loads and compensates reactive power for power for Power Factor Correction (PFC) or Zero Voltage Regulation (ZVR) at AC main. Fuzzy controller regulates the DC bus voltage at the time of load variation, also provides accurate reference current extraction, frequency independent operation and relatively fast transient response. Hysteresis current controller has current limiting capacity to limit the current error within fixed tolerance band. The grid interfaced solar PV power generating system is tested for PFC and ZVR mode of operation along with harmonics current elimination and load balancing of linear and non-linear loads. Simulation results are presented for the fundamental frequency of 50 Hz.