有源滤波器的控制延迟补偿

In the actual power system three-phase voltages are distorted and asymmetric which contain a large number of negative sequence components, traditional ip-iq method which detect harmonic currents based on instantaneous reactive power theory will have error, so the positive sequence voltage component of A phase need be extracted. Improved instantaneous symmetrical components structures the rotary phases without delay, receives the instruction of the current accurately. The delay introduced by the signal sampling ,the calculation of reference current and PWM control are eliminated by revising reference current ,and finally achieving current tracking by using SVPWM current control method. Simulation results show that the improved instantaneous symmetrical component method is accurate for isolating the A-phase positive voltage, the control delay compensation effectively improve the results of current compensation.