The Research and Simulation of Shunt Hybrid Active Power Filter Based on PSCAD/EMTDC

Shunt hybrid active power filter (SHAPF) is one of the most powerful equipments in resolving harmonics of power quality problems and compensating system reactive power. In this paper, a new type of HAPF is expatiated including a fundamental series resonance circuit and an injective capacitance, thus decreases the capacity of active inverter. Based on instantaneous reactive power theory, i_p - i_q method is used in detecting harmonic currents and triangle waveform current tracking control method is applied to control the active inverter switch to enhance the accuracy of detection and control. Based on PSCAD/EMTDC, a SHAPF model is established, from the simulation results it is proved that the capacity of active power filter is decreased greatly; the initial investment is reduced and obtained better performance in harmonic suppression and reactive power compensation.