基于新型换流变压器的直流输电系统滤波装置

Design of HVDC Filter Device Based on New-Type Converter Transformer

提出一种利用变压器耦合绕组的安匝平衡作滤波机理的新型滤波方式,描述了该滤波方式的原理、接线及实现特点。通过对一具体的整流侧采用新型换流变压器、逆变侧采用传统换流变压器的直流输电系统滤波与无功补偿装置的综合设计与仿真实验,对比分析新型滤波方式与传统无源、有源滤波方式在滤波器设计难易程度、滤波效果、对换流变压器及交直流系统影响上的差异。算例结果与仿真分析表明:新型滤波方式开发了变压器的滤波潜能,采用无源滤波的相似设备达到了有源滤波的相似效果,大大降低了谐波与无功对换流变压器的不良影响,改善了换流桥交流阀侧的电压与电流波形,在直流输电系统各个方面均体现出其独特的优越性。

A new-type filtering way was presented which uses the winding ampere tuna＇s balance as the filtering principle, then the principle, connection and realization characteristic were described. Through the synthesis design and simulaton experiment for the filters and reactive compensator of a HVDC system whose rectifier uses the new-type converter and its inverter uses the traditional converter transformer, the differences for the new-type filter, traditional passive filter and active filter＇s design difficulty degree, filtering effect, and the influence to the converter transformer and AC/DC system are contrast analyzed. The calculating example result and simulation analysis show that the new-type filtering way dusing the passive filter＇s similar equipment achieves the active filter＇s similar effect, reduces the reactive and harmonic＇s bad effects to the converter transformer, improves the converter bridge AC side voltage and current wave, and manifests its unique superiority in HVDC system＇s each aspect.