Breaking Characteristics of AC-filter Breaker for UHVDC with Hierarchical Connection to AC Grid

被引：0
|
作者：
Wang Y. [1 ]
Yu Z. [2 ]
Ji Y. [3 ]
Fu Y. [2 ]
Mou Y. [2 ]
He J. [2 ]
机构：
[1] China Electric Power Planning & Engineering Institute Co., Ltd., Beijing
[2] State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing
[3] State Grid Economic and Technology Research Institute, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 09期
基金：
国家重点研发计划;
关键词：
AC-filter; Breaker; Breaking characteristics; Hierarchical connection; Reactive power grouping; UHVDC;
D O I：
10.13336/j.1003-6520.hve.20181207018
中图分类号：
学科分类号：
摘要：
When a UHVDC project is hierarchically connected to AC grid, the performance of AC-filter breaker significantly influences the operation reliability. To study the breaking characteristics of the AC filter breaker of ±800 kV UHVDC hierarchical connection to AC grid, a circuit analysis model is established. It is concluded that when a DC line ground fault occurs and all AC filters need to be removed under the bipolar operation mode, the break recovery voltage peak value between the AC-filter breaker reaches the maximum. When all AC filters are removed during a ground fault in the AC net, the breaking current peak value is the highest. As the filter reactive power capacity increases, the breaking current of the circuit breaker increases. When cutting off a large group of filters of the same capacity, the breaking current under the small operation mode is greater than the one under the large operation mode. Under the same operation mode, the peak break recovery voltage is similar when filter groups with different capacity are cutting off. It is verified that the break recovery voltage is mainly related to the system operation mode and the AC bus voltage, but is negligibly related to the filter capacity. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
收藏
页码：2857 / 2865
页数：8
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