中高压电网有源电力滤波器拓扑结构对比分析

Analysis on Converter Topology of Active Power Filters Applied to Middle Voltage and High Voltage System

随着中高压大容量非线性负载不断增加,中高压电网的谐波污染问题日益严重。有源电力滤波器(APF)作为治理谐波最有效的手段,其在中高压大容量领域的应用已经成为电气工程学科的研究热点。但是由于功率器件耐压水平的限制,迄今为止尚未产生一种广泛适用于中高压大容量谐波治理的电路拓扑结构和控制方法。针对用于中高压有源电力滤波器的拓扑结构进行研究,对比分析了变压器低压侧接并联型有源电力滤波器拓扑结构,混合型有源电力滤波器拓扑结构,多电平有源电力滤波器拓扑结构等各种变流器结构,指出了各自的优缺点。

With continuous proliferation of nonlinear loads in moderate and high voltage grid, the problem of harmonic contamination deteriorates increasingly. Active power filters（APF） are considered as the most effective method to restrict harmonic. Control of harmonic perturbations by APFs in high voltage grid has be- come a hot topic in the power engineering field. But due to the limitation of the voltage capability of the power devices, the control method and inverter topology applied on handling nonlinear loads is not presented in middle voltage and high voltage system yet. These inverter topologies of the APFs applied to middle voltage and high voltage system were researched. These inverter topologies of shunt active power filter connected to power system with transformer, hybrid active power filter（HAPF）, and active power filter with multilevel inverter were analyzed. The advantage and disadvantage of each topology were pointed out.