The Control Delay Compensation of APF under the Condition of Non-Ideal Source Voltages

In the actual power system three-phase voltages are distorted and asymmetric and contain a large number of negative sequence components. Traditional ip-iq method which detect harmonic currents based on instantaneous reactive power theory will be inaccurate, so the positive sequence voltage component of A-phase need be extracted. Improved instantaneous symmetrical components structured a rotary phases without delay, received the instruction of the current accurately. The delay introduced by the signal sampling , the calculation of reference current and PWM control was eliminated by revising reference current ,and the current was tracked by using space vector control method. Simulation results show that the improved instantaneous symmetrical component method isolates the A-phase positive voltage accurately, the control delay compensation improves the effects of current compensation effectively.