特高压直流输电系统新型谐波抑制方法研究

A New Harmonic Suppression Method for UHVDC Transmission Systems

传统的特高压直流输电系统一般在换流站交流网侧布置滤波兼无功补偿装置.为了避免谐波对换流变压器的不良影响,本文提出了一种滤波绕组并联的感应滤波换流变压器的谐波抑制方法,文中描述了其接线方案,解释了其滤波机理,并与传统的滤波方案进行了对比分析.以酒泉-湖南的±800kV特高压直流输电的工程参数为依据,搭建了所提滤波方案和传统方案的仿真模型.两个模型的阀侧和网侧电流的对比分析证明,新型谐波抑制方法效果良好.

In traditional UHVDC transmission systems, the filtering and reactive power compensation devices are generally installed at the power grid side of the converter stations. In order to reduce the negative effects caused by harmonic currents on the converter transformers, a harmonic suppression method of inductive filtering converter transformers with parallel filtering windings was proposed. This paper de- scribed the corresponding detailed wiring schemes, explained the filtering mechanism and compared it with the traditional filtering solution. Referring to the engineering parameters of the Jiuquan-Hunan -＋-800 kv UHVDC transmission project, the simulation models of the proposed harmonic filtering scheme and the traditional schemes were established respectively. Based on the comparative analysis of the currents at the grid and valve sides of the two models, it can come to the conclusion that the proposed harmonic suppression scheme has a better operational performance in contrast with the traditional one.