牛从直流牛寨站典型故障仿真分析及保护改进建议

doi:10.11985/2021.02.022

电气工程学报 ›› 2021, Vol. 16 ›› Issue (2): 174-180.doi: 10.11985/2021.02.022

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牛从直流牛寨站典型故障仿真分析及保护改进建议

代书龙(), 张锐()

中国南方电网超高压输电公司曲靖局曲靖 655000

收稿日期:2020-06-24 修回日期:2021-01-20 出版日期:2021-06-25 发布日期:2021-08-05
通讯作者: 代书龙 E-mail:951508268@qq.com;22121441@qq.com
作者简介:代书龙,男,1989年生,工程师。主要研究方向为高压直流输电系统电磁暂态仿真分析。E-mail： 951508268@qq.com
张锐,男,1974年生,高级工程师。主要研究方向为高压直流输电系统换流站运行与管理。E-mail： 22121441@qq.com

Typical Faults Simulation Analysis and Protection Improvement Suggestions of Niu-cong HVDC Niuzhai Station

DAI Shulong(), ZHANG Rui()

Qujing Bureau, CSG EHV Power Transmission Company, Qujing 655000

Received:2020-06-24 Revised:2021-01-20 Online:2021-06-25 Published:2021-08-05
Contact: DAI Shulong E-mail:951508268@qq.com;22121441@qq.com

摘要/Abstract

摘要：

为了研究牛从直流牛寨站发生各典型故障时的故障发展机理以及当前保护系统动作特性,以便为直流控制保护逻辑优化提供理论依据,在牛从直流PSCAD/EMTDC仿真模型中设置牛寨站各典型故障,研究发现牛寨站换流变网侧故障消除后直流系统可快速恢复正常。换流变阀侧及阀区接地故障均导致牛从直流牛寨侧接地极流过强电流,短路故障均导致交流侧发展为三相短路。指出当前牛从直流50 Hz保护存在的弊端,并提出改进措施。根据阀短路特性提出一种新型阀短路保护判据,可与当前保护原理构成双重化保护,为今后直流工程保护系统设计提供理论参考依据。

关键词: 牛从直流, 典型故障, PSCAD/EMTDC仿真, 50 Hz保护, 阀短路保护

Abstract:

In order to study the development mechanism of faults and the action characteristics of current protection system in Niu-cong HVDC Niuzhai station theoretical basis for HVDC control protection logic optimization is provided. The typical faults of Niuzhai station in the simulation model of Niu-cong HVDC PSCAD/EMTDC is set up. It is found that the HVDC system can return to normal quickly after eliminating the faults on the grid side of converter transformer of Niuzhai station. The grounding fault of valve side of converter transformer and valve area will results in strong current flowing through the grounding electrode of DC Niuzhai side, short circuit faults will leads to the development of three-phase short circuit in AC side. It points out the disadvantage of the current 50 Hz protection and puts forward the improvement measures. According to the characteristics of valve short-circuit, a new criterion of valve short-circuit protection is proposed, which can form dual protection with the current protection principle, and provide theoretical reference for the design of HVDC engineering protection system in the future.

Key words: Niu-cong HVDC, typical faults, simulation of PSCAD/EMTDC, 50 Hz protection, valve short circuit protection

中图分类号:

TM771

代书龙, 张锐. 牛从直流牛寨站典型故障仿真分析及保护改进建议[J]. 电气工程学报, 2021, 16(2): 174-180.

DAI Shulong, ZHANG Rui. Typical Faults Simulation Analysis and Protection Improvement Suggestions of Niu-cong HVDC Niuzhai Station[J]. Journal of Electrical Engineering, 2021, 16(2): 174-180.

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时间	原因	50 Hz保护动作情况
2014年04月14日19:42	牛从乙直流极1换流变充电	从西站牛从甲双极切换控制系统,牛从甲直流功率由1 550 MW降至960 MW
2014年05月19日23:39	溪洛渡电厂17号主变充电	从西站牛从甲切换控制系统,牛从甲直流极2的50 Hz保护动作,该极转为备用状态,牛从甲直流极1功率回降
2014年06月02日00:43 2014年06月02日21:04	牛从乙直流极2换流变充电	从西站牛从甲双极切换控制系统,功率回降目标值为960 MW(充电前功率已调整为960 MW)
2014年06月02日20:45 2014年06月02日22:35 2014年06月02日22:51	牛从乙直流极2换流变充电	从西站牛从甲双极切换控制系统

牛从直流牛寨站典型故障仿真分析及保护改进建议

Typical Faults Simulation Analysis and Protection Improvement Suggestions of Niu-cong HVDC Niuzhai Station

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