用于配电网故障消弧的级联H桥多电平变换器设计及仿真

Design and Simulation of Cascaded H Bridge Multilevel Converters Used for Faults Arc Extinguishing of Distribution Networks

将级联H桥多电平变换器用于配电网单相接地故障的消弧,不仅能够满足配电网高电压大功率的要求,同时其良好的输出波形特性能够满足故障电流全补偿的要求。本文对该变换器进行设计,确定主电路参数,选择合适的控制策略并对其进行建模,同时采用悬浮电容为级联H桥多电平变换器提供直流电压,因此设计直流侧电容电压稳定电路,最后通过PSCAD/EMTDC对设计结果进行仿真验证。

Cascaded H Bridge Multilevel Converters used for single phase grounding faults arc extinguishing can meet requirements of high voltage and high power of the distribution networks. At the same time, it can meet the requirements of fault current total compensation because of the good output characteristics. This paper designs the converter. It determines the parameters of the main circuit. Then choosing appropriate control strategy and molding. Besides, the dc voltage is provided by capacitor, so it designs voltage stabilizing circuit of dc side PSCAD/EMTDC. capacitors. Finally, it verifies design results by using