交直流互联系统对距离保护动作特性的影响分析及对策

SHEN Hongming

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交直流互联系统对距离保护动作特性的影响分析及对策

更新时间：2025-08-13

- 交直流互联系统对距离保护动作特性的影响分析及对策
- Automation of Electric Power Systems Vol. 39, Issue 11, Pages: 58-63(2015)
- 作者机构：
  
  新能源电力系统国家重点实验室，华北电力大学,北京市,102206
- 作者简介：
- 基金信息：
- DOI：
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- Published：2015
- 稿件说明：
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SHEN Hongming. [J]. Automation of electric power systems, 2015, 39(11): 58-63.
DOI：

SHEN Hongming. [J]. Automation of electric power systems, 2015, 39(11): 58-63. DOI：

摘要

交直流互联系统换相失败时引起的电磁暂态过程与纯交流环境时不同，从而对交流工频量的距离保护的动作行为产生影响。通过引入象限的概念

分析了换相失败期间逆变器交流侧等值工频电流的暂态特性，然后详细研究了考虑零序补偿电流下换相失败对距离保护的具体影响，分析结果表明

换相失败对距离保护的影响主要与故障位置以及过渡电阻的大小有关;并提出了基于零序方向元件及基于测量电抗变化的“纵续”动作的解决措施。大量的PSCAD/EMTDC仿真结果验证了结论的正确性。

Abstract

The transient process caused by commutation failure in an AC/DC interconnected system is not the same as that of the purely AC system

which affects the performance of distance protection that uses the fundamental frequency. The transient characteristic of equivalent power-frequency current on the inverter side is analyzed first by introducing the concept of quadrant. Then

the effect of commutation failure on distance protection is studied in detail by considering the connection mode of relay. The analysis results show that the fault position and fault resistance both significantly influence the performance of distance protection. Furthermore

novel countermeasures based on the zero-sequence directional component and the successive trip used for measuring the change of reactance are put forward. Simulation results based on PSCAD/EMTDC have proved the conclusion correct. This work is supported by National Basic Research Program of China (973 Program) (No. 2012CB215206).

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