感应滤波对新型换流变压器短路电抗的影响

摘要

针对感应滤波技术是否影响新型换流变压器短路电抗的问题,简要介绍了直流输电系统的接线方案及感应滤波技术的基本原理,并论述了换流变压器短路电抗在直流输电系统短路故障中的作用,推导出判断换流变压器短路电抗变化的方法.在此基础上,通过理论计算和仿真计算,研究滤波前后换流变压器短路电抗的变化情况.结果表明,感应滤波技术对新型换流变压器短路电抗的影响非常小,可以忽略不计.感应滤波既能改善换相特性,又不会恶化短路特性,克服了传统直流输电系统两者不可兼顾的缺点,说明新型换流变压器应用于直流输电系统具有独特优势.%To answer whether the induction filtering technology impacted on the short-circuit reactance, firstly introduced the connection scheme of the DC transmission system and the basic principles of the induction filtering technology. Then, it outlined the role of short-circuit reactance of the converter transformer in DC transmission when short-circuit fault happened and deduced the method that could judge whether the short-circuit reactance of the converter transformer changed. On the basis, through theoretical and simulation calculation, it researched the change of the short-circuit reactance of the converter transformer before and after filtering. Results showed that the inductive filtering has little impacts on the short-circuit reactance of the novel converter transformer, which can be neglected. It not only can improve the commutation characteristic but also will not deteriorate the short-circuit characteristic, which overcomes the shortcomings in the traditional DC transmission system and indicates that the novel converter transformer has unique advantages to apply to the DC transmission system.