多电平单相级联有源滤波器载波调制与电容电压平衡方法

摘要

级联型结构变流器在高压大功率领域得到越来越广泛的应用.该文研究一种级联相移多电平单相电压型电力有源滤波器结构,首先分析了模块单元间载波相移控制原理,其次提出了一种直流侧电容电压平衡控制方法,最后在Matlab仿真平台上搭建了仿真模型.仿真结果表明,该级联结构滤波器能够有效治理负载引起的谐波电流,并且保证了各模块直流侧电压稳定.%Recently,cascade converters are more widely used in high-voltage high-power fields.In this paper,an active power filter(APF)of cascade multi-level phase-shift single-phase voltage type is studied.At first,the inter-module carrier phase-shift control principle is analyzed.Then,a DC capacitor voltage balance control method is proposed.At last,a simulation model is built in Matlab platform.Simulation results show that the proposed cascade filter can effectively control the harmonic currents caused by load,and ensure the stable DC-side voltage of each module.