中压配电网的混合型滤波器设计

A hybrid active power filter for medium-voltage distribution networks

针对中压配电网大功率非线性负载谐波治理问题,提出一种用于10/6.6 kV中压配电网的新型大容量混合型电力滤波器(hybrid active power filter,HAPF)。它由有源滤波器(activepower filter,APF)、基频谐振电路(undamental resonance circuit,FRC)和无源滤波器(passivefilter,PF)3部分组成。APF和FRC并联后直接和PF相连,而未使用变压器。FRC用于吸收流过PF的基波无功电流,使流入有源滤波器的电流大大降低。APF采用基于二极管中点箝位式(neutral-point-clamped,NPC)三电平结构,使有源滤波器的工作电压大大提高。对该混合型滤波器滤波原理、无源滤波器的设计进行了理论分析和仿真结果表明,这种混合型有源滤波器非常适用于大功率非线性负载的谐波抑制。

A novel hybrid active power filter （HAPF） for medium-voltage distribution networks was proposed. A HAPF was composed of an active power filter （APF）, a passive filter （PF） and a fundamental resonance circuit （FRC）. An APF was shunted to an FRC without any matching transformer. The FRC was used to absorb the basic reactive current of a PF, thus significantly decreasing the current through the APF. The APF uses a diode neutral-point-clamped （NPC） three-level inverter. The theoretical analyses and simulation results show that the proposed HAPF is feasible for restraining harmonics in high-power non-linear loads.