逆变型新能源场站柔性直流送出系统交流线路差动保护灵敏性优化方案

doi:10.12204/j.issn.1000-7229.2022.01.007

电力建设 ›› 2022, Vol. 43 ›› Issue (1): 63-69.doi: 10.12204/j.issn.1000-7229.2022.01.007

• 高比例新能源交直流电网特性分析与运行控制·栏目主持辛业春教授、姜涛教授、吴学光教授、宋晓博士· • 上一篇下一篇

逆变型新能源场站柔性直流送出系统交流线路差动保护灵敏性优化方案

刘一民¹(), 王书扬²(), 李彬²(), 王兴国²(), 郑少明¹(), 董鹏¹()

1.国家电网有限公司华北分部,北京市 100053
2.中国电力科学研究院有限公司,北京市 100192

收稿日期:2021-09-22 出版日期:2022-01-01 发布日期:2021-12-21
通讯作者: 李彬 E-mail:hbdwjbbh@163.com;wangshuyang@epri.sgcc.com.cn;m13220117677@163.com;wangxingguo@epri.sgcc.com.cn;sky2001mh@163.com;dongpengufo@163.com
作者简介:刘一民(1981),男,高级工程师,主要研究方向为继电保护运行与管理,E-mail: hbdwjbbh@163.com;
王书扬(1993),男,硕士,工程师,主要研究方向为电力系统继电保护,E-mail: wangshuyang@epri.sgcc.com.cn;
王兴国(1981),男,博士,教授级高级工程师,主要研究方向为电力系统继电保护,E-mail: wangxingguo@epri.sgcc.com.cn;
郑少明(1983),男,硕士,高级工程师,主要研究方向为继电保护运行与管理,E-mail: sky2001mh@163.com;
董鹏(1985),男,硕士,高级工程师,主要研究方向为继电保护运行与管理,E-mail: dongpengufo@163.com。
基金资助:
国家电网有限公司科技项目(1200/2020-02003B)

Sensitivity Optimization Scheme of AC Line Differential Protection in MMC-HVDC System of Inverter New Energy Station

LIU Yimin¹(), WANG Shuyang²(), LI Bin²(), WANG Xingguo²(), ZHENG Shaoming¹(), DONG Peng¹()

1. North China Branch of State Grid Corporation of China, Beijing 100053, China
2. China Electric Power Research Institute, Beijing 100192, China

Received:2021-09-22 Online:2022-01-01 Published:2021-12-21
Contact: LI Bin E-mail:hbdwjbbh@163.com;wangshuyang@epri.sgcc.com.cn;m13220117677@163.com;wangxingguo@epri.sgcc.com.cn;sky2001mh@163.com;dongpengufo@163.com
Supported by:
State Grid Corporation of China Research Program(1200/2020-02003B)

摘要/Abstract

摘要：

针对逆变型新能源场站柔性直流送出系统交流线路差动保护灵敏度降低问题,提出了一种基于改进判据的差动保护优化方案。利用逆变型新能源场站柔性直流送出系统交流线路故障特征,分析交流线路差动保护的适应性,正常区内故障时,将制动分量设为0,提升保护的灵敏性,当两侧相角差超90°时,判据中加入两侧电流相角差来削减灵敏性降低程度;与直接降低制动系数的方法相比,优化方案可以通过改变参数来兼顾差动保护的可靠性,且优化方案不受逆变型新能源场站外接系统强弱影响,适用范围更广;最后,利用PSCAD仿真软件搭建了逆变型新能源场站接入张北四端柔性直流系统模型,仿真验证了优化方案的有效性。

关键词: 新能源, 柔性直流输电, 差动保护, 灵敏性

Abstract:

In order to reduce the sensitivity of AC line differential protection in flexible DC transmission system of inverter new energy station, an optimization scheme of differential protection based on improved criterion is proposed. Firstly, according to the AC line fault characteristics of the flexible DC transmission system of the inverter new energy station, the adaptability of the AC line differential protection is analyzed. In case of fault in the normal area, the braking component is set to 0 to improve the sensitivity of the protection. When the phase angle difference on both sides exceeds 90°, the current phase angle difference on both sides is added to the criterion to reduce the reduction of sensitivity. Then, compared with the method of directly reducing the braking coefficient, the optimization scheme can take into account the reliability of differential protection by changing parameters, and the optimization scheme is not affected by the strength of the external system of the inverter new energy station. Finally, the 4-terminal flexible DC system model of inverter new energy station connected to Zhangbei is built in PSCAD simulation software, and the simulation verifies the effectiveness of the optimization scheme.

Key words: new energy, VSC-HVDC, differential protection, sensitivity

中图分类号:

TM773

刘一民, 王书扬, 李彬, 王兴国, 郑少明, 董鹏. 逆变型新能源场站柔性直流送出系统交流线路差动保护灵敏性优化方案[J]. 电力建设, 2022, 43(1): 63-69.

LIU Yimin, WANG Shuyang, LI Bin, WANG Xingguo, ZHENG Shaoming, DONG Peng. Sensitivity Optimization Scheme of AC Line Differential Protection in MMC-HVDC System of Inverter New Energy Station[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(1): 63-69.

图/表 8

图1 逆变型新能源场站柔性直流送出系统拓扑图

Fig.1 Topology diagram of flexible DC delivery system of inverter new energy station

图2 AB两相相间故障时线路两侧故障相电流相量图

Fig.2 Phasor diagram of fault phase current on both sides of line under phase-to-phase fault between A and B

图3 仿真模型示意图

Fig.3 Schematic diagram of simulation model

图4 F2点AB相间故障时线路两侧A相电流

Fig.4 Currents in phase A on both sides of the line in case of phase-to-phase fault at F2 between A and B

图5 F2点AB相间短路故障下两侧A相电流夹角

Fig.5 Angle difference of two-end currents in phase A under phase-to-phase fault at F2 between A and B

图6 F2点AB相间短路故障下三种电流比值

Fig.6 Three current ratios under phase-to-phase fault at F2 between A and B

图7 F2点AB相间短路故障下各分量对比

Fig.7 Comparison of each component under phase-to-phase fault at F2 between A and B

表1 弱系统时不同故障条件下差动保护动作情况

Table 1 Performances of differential protection under different fault situations in a weak system

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逆变型新能源场站柔性直流送出系统交流线路差动保护灵敏性优化方案

Sensitivity Optimization Scheme of AC Line Differential Protection in MMC-HVDC System of Inverter New Energy Station

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