| 引用本文: | 王思华,赵 磊,王军军,陈 龙.基于MMC的直流输电系统双极短路故障保护策略研究[J].电力系统保护与控制,2021,49(11):9-17.[点击复制] |
| WANG Sihua,ZHAO Lei,WANG Junjun,CHEN Long.Research on protection strategy of a bipolar short circuit fault in an HVDCtransmission system based on MMC[J].Power System Protection and Control,2021,49(11):9-17[点击复制] |
|
| 摘要: |
| 直流侧故障的区间识别和准确定位是多端柔性直流电网亟需解决的重要问题。利用双极短路故障的电流特征，提出了一种基于Pearson相关系数的故障区间识别方法。根据故障后电流的最大值及其对应的电压值，提出了一种基于双端非同步电气量数据的故障定位方法。设计了包括故障启动、故障区间识别、故障定位、故障隔离在内的线路保护方案。该方案通过利用本地的电气量来实现线路保护，具有较强的耐受过渡电阻和抗扰动的能力。在PSCAD平台上搭建了一个四端柔性直流输电系统，经大量的仿真验证了所提出的故障区间识别和故障定位方案的适用性和准确性。 |
| 关键词: 多端柔性直流电网 模块化多电平换流器 双极短路 故障区间识别 故障定位 |
| DOI：DOI: 10.19783/j.cnki.pspc.200999 |
| 投稿时间：2020-08-16修订日期：2020-10-22 |
| 基金项目:国家自然科学基金资助项目(51767014，51867013)；中国铁路总公司科技研究开发计划资助项目(2017010-C) |
|
| Research on protection strategy of a bipolar short circuit fault in an HVDCtransmission system based on MMC |
| WANG Sihua1,2,ZHAO Lei1,WANG Junjun1,CHEN Long1 |
| (1. College of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. Rail Transit
Electrical Automation Engineering Laboratory of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China) |
| Abstract: |
| Interval identification and accurate location of faults on the DC side are important issues that need to be resolved urgently for a multi-terminal flexible DC grid. This paper uses the current characteristics of bipolar short-circuit faults and proposes a fault interval identification method based on the Pearson correlation coefficient. Given the maximum value of the current after the fault and its corresponding voltage value, a fault location method based on double-ended asynchronous electrical quantity data is proposed. A line protection scheme including fault initiation, fault zone identification, fault location, and fault isolation is designed. This scheme realizes line protection by measuring local electrical quantities, and has strong tolerance to transition resistance and anti-disturbance capabilities. A four-terminal flexible DC transmission system is built on the PSCAD platform, and a large number of simulations have verified the applicability and accuracy of the fault zone identification and fault location scheme proposed in this paper.
This work is supported by the National Natural Science Foundation of China (No. 51767014 and No. 51867013). |
| Key words: multi-terminal flexible DC grid modular multi-level converter bipolar short circuit fault section identification fault location |
