基于三相四桥臂逆变器的APF预测控制方法的研究

为解决三相四线制不对称电网系统中的谐波污染问题,提出了一种应用于三相四桥臂有源电力滤波器(APF)的控制方法。该方法在T采样时刻预测出T+1时刻的网侧电压和逆变器输出电流值,并根据建立的系统数学模型计算出T+1时刻的参考电压值,然后利用三维电压空间矢量调制得出主电路的控制信号,驱动主电路输出补偿电流以达到消除谐波的目的。此方法能有效降低采样、计算环节带来的延时,具有直流电压利用率高,系统动态响应好的优点。仿真实验证明了该方法的可行性。

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.