阻抗可控的并联混合型有源电力滤波器

针对高压交流电力系统,提出一种基于阻抗可控的并联混合型有源电力滤波器新原理。通过电力电子变换器的控制,使得并联变压器呈现可控的阻抗。它始终对谐波呈现近似为零的低阻抗,从而输导系统中的谐波电流,流入并联变压器支路;同时对基波呈现连续无级可调的电抗,与无源电力滤波器相结合,实时补偿系统的无功功率。为满足有源电力滤波器大容量的工程需要,并联变压器采用二次侧多补偿绕组的结构。提出一种适合该滤波原理的指令电流运算方法。仿真结果表明此滤波新方案具有良好的谐波抑制和无功功率补偿的性能。

A Novel Shunt Hybrid Active Power Filter Based on Controllable Impedance

A novel principle of active power filter based on controllable impedance is proposed for high voltage alternate power systems application. The parallel transformer can exhibit controllable impedance under the control of power electronic converters. On the one hand, the transformer can exhibit nearly zero impedance to harmonic current and thus lead harmonic current to flow into the transformer branch. On the other hand, the transformer can exhibit continuously adjustable reactance to fundamental current and thus together with the passive power filter compensate reactive power. To increase the capacity of the active power filter, a special transformer structure with multiple secondary compensation windings is adopted. In the mean time, a new reference current operation method is put forward. The simulation results show that the performance in harmonic suppression and reactive power compensation of the proposed scheme is satisfactory.