一种电压源型有源电力滤波器的新型控制方法

研究了电压源型有源电力滤波器、电源及非线性负载三者之间的能量交换机理,分析了变流器直流侧电容电压的稳定问题,提出了维持直流侧电容电压稳定的新方法。在此基础上提出了一种电压源型有源电力滤波器的新型控制方法,详细推导了控制方程。该方法无需检测三相负载电流和三相输入电压,无需计算参考电流、无功电流和谐波电流;只需检测两相电源电流和直流侧电容电压,通过简单运算就可直接求出每个开关周期内各开关的占空比,实现滤波器的控制。仿真研究结果表明新型控制方法能有效补偿谐波电流和无功电流,抑制负载不对称。

Control method for voltage source active power filters

The principle of energy commutation among voltage-source APF(Active Power Filter),source and nonlinear load is studied,the stability of DC bus capacitor voltage is analyzed and a method maintaining the stability of DC bus capacitor voltage is presented,based on which,a control method for voltage source APFs is introduced with the deduction of its control equations.The measurements of three-phase load currents and three-phase input voltages and the calculations of reference current,harmonic current and reactive current are eliminated.The duty ratios of switches in each switching cycle for APF control can be directly obtained by the simple calculation with two phase source currents and DC bus capacitor voltage.Simulation results verify that this control method can effectively compensate harmonic current and reactive current,and restrain load dissymmetry.