【摘要】 有源滤波器的滤波效果很大程度上取决于其控制性能,为了使逆变器的输出能迅速、准确地跟随参考信号的变化,提出了一种单独注入式有源滤波器控制方法。该法将负载谐波电流分成不同频率段的谐波电流信号,这些电流信号通过相应的谐波相位补偿器补偿无源部分相位偏差,再将各频段的谐波电流控制信号累加算得有源电力滤波器的PWM控制信号。仿真结果表明:该法控制的有源滤波器控制器滤波效果好、实时性强。更多还原

【Abstract】 Harmonics can be limited either by improving the design of nonlinear loads(e.g.,increasing the number of pulses,enlarging the ac choke inductance,considering active front-ends,etc) or by adding filters to the power system.Although passive filters have been traditionally used for this task,the ongoing sustained developments in power electronics have made the use of active power filter.It is largely due to the advantages of APF’s over passive filter.This paper presents a shunt APF based on a three-phase voltage source inverter(VSI).The filtering effect of APF is to a large extent decided by the controlling performance.When APF is working in the harmonic wave area,its converter is non-linear,and phase shift occurs when harmonic waves pass the passive component,so the loaded harmonic current can be divided into signals of different frequency,then the harmonic current signals compensate the passive component phase error through its respective harmonic phase compensation,and the harmonic current control signal of each frequency is added,by which the PWM control signal comes out.Simulation result indicates that by this method the APF has a good filtering effect and real-time performance.更多还原