| 引用本文: | 陈 磊,何慧雯,王 磊,李国城,陈红坤.基于限流器与断路器协调的混合直流输电系统故障隔离方法[J].电力系统保护与控制,2020,48(19):119-127.[点击复制] |
| CHEN Lei,HE Huiwen,WANG Lei,Guocheng,CHEN Hongkun.Fault isolation method of a hybrid HVDC system based on the coordination of a fault current limiter and a DC circuit breaker[J].Power System Protection and Control,2020,48(19):119-127[点击复制] |
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| 摘要: |
| 为妥善处理混合直流输电系统的故障隔离问题，提出了一种基于限流器和直流断路器协调的故障隔离方法。阐述了限流器和直流断路器的结构与建模思路，设计了两者的时序协调方案。考虑限流器动作和断路器分断各暂态阶段，建立了混合直流输电系统的故障等效电路，理论推导了系统峰值电流、耗散能量和故障清除时间的数学关系。利用PSCAD/EMTDC平台，搭建了320 kV混合直流输电仿真测试系统。仿真比较了不同限流电阻、主断路器延时及故障深度下系统的暂态性能。仿真结果验证了所提方法在抑制短路电流、加速故障隔离与降低断路器耗散能量等方面的积极效应，肯定了其应用于混合直流输电系统的有效性和适应性。 |
| 关键词: 混合直流输电 限流器 直流断路器 故障隔离 暂态特性 |
| DOI：DOI:10.19783/j.cnki.pspc.191600 |
| 投稿时间：2019-12-25修订日期：2020-02-27 |
| 基金项目:国家电网公司总部科技项目资助“LCC-VSC混合直流输电系统过电压与绝缘配合研究”(SGTYHT/16- JS-198) |
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| Fault isolation method of a hybrid HVDC system based on the coordination of a fault current limiter and a DC circuit breaker |
| CHEN Lei,HE Huiwen,WANG Lei,Guocheng,CHEN Hongkun |
| (1. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China; 2. State Key Laboratory
of Power Grid Environmental Protection, China Electric Power Research Institute,Wuhan 430074, China) |
| Abstract: |
| In order to properly handle the problem of fault isolation in the hybrid High Voltage DC (HVDC) transmission system, a fault isolation method based on the coordination of a Fault Current Limiter (FCL) and a DC Circuit Breaker (DCB) is proposed. The structure and modeling of FCL and DCB are expounded, and the timing coordination scheme of the two devices is designed. Considering the transient stages of the FCL action and the DCB operating, the fault equivalent circuit of the hybrid DC transmission system is built, and the mathematical equations of the peak current, dissipated energy and fault clearance time are theoretically derived. Using a PSCAD/EMTDC platform, a 320 kV class hybrid HVDC transmission test system is built. Different current limiting resistances, main breaker delays and fault severities are simulated, and the transient behaviors of the system are compared. The simulation results verify the positive effects of the proposed method on inhibiting the short-circuit current, speeding up fault isolation, and reducing the dissipated energy in the DCB. The effectiveness and adaptability of the proposed method in the hybrid HVDC transmission system are confirmed.
This work is supported by Science and Technology Project of the Headquarter of State Grid Corporation of China “Study on overvoltage and insulation coordination of hybrid HVDC system with LCC-VSC” (No. SGTYHT/16-JS-198). |
| Key words: hybrid HVDC fault current limiter DC circuit breaker fault isolation transient characteristics |
