Investigation on the Control Method of APF Forecast Based on the Three-phase Four-leg Converters
To solve the asymmetric three-phase four-wire power system harmonic pollution,in this paper,a method is applied to the three-phase four-leg active power filter(APF) control,the method is used to predict the net side voltage and converters output current values from T+1 sampling time when in T sampling time,calculate the reference voltage values in T+1 times based on the establishment of a systemic mathematical model,then use the three-dimensional voltage space vector to modulate control signal of main circuit,drive the main circuit to output compensation current to achieve the objective of eliminating harmonic.This method can reduce the delay caused by sampling and calculation,having the advantages of high efficiency usage of DC voltage,good dynamic response.The simulation results show the feasibility of the method.