| 引用本文: | 李大虎,肖 博,饶渝泽,等.基于因果关系的新能源接入受端电网连锁故障演化路径和机理分析[J].电力系统保护与控制,2026,54(03):46-58.[点击复制] |
| LI Dahu,XIAO Bo,RAO Yuze,et al.Analysis of the evolution paths and mechanisms of cascading failures in receiving power grids with new energy integration based on causal relationships[J].Power System Protection and Control,2026,54(03):46-58[点击复制] |
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| 摘要: |
| 随着特高压直流输电和新能源的持续发展，受端电网中交流-直流-新能源耦合关系日益复杂，单一交流故障处理不当容易引发系统性连锁故障，严重威胁受端电网安全运行。为揭示受端电网连锁故障演化机理，首先推导直流换相失败、新能源高/低电压穿越及脱网、直流闭锁等关键事件的因果联系。其次，分析了不同联络线阻抗和换相失败预防(commutation failure prevention, CFPREV)控制下直流换相失败对新能源低电压穿越的影响。最后，基于因果关系揭示了受端电网连锁故障演化机理和路径。基于PSCAD/EMTDC搭建了复杂受端电网模型，通过典型连锁故障仿真算例，验证了受端电网连锁故障演化路径与机理分析的正确性。 |
| 关键词: 受端电网 换相失败 直流闭锁 新能源连锁脱网 因果关系 连锁故障演化 |
| DOI：10.19783/j.cnki.pspc.250353 |
| 投稿时间：2025-04-05修订日期：2025-07-15 |
| 基金项目:国家自然科学基金项目资助(523B2074)；国网湖北省电力有限公司科技项目资助(521505230006) |
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| Analysis of the evolution paths and mechanisms of cascading failures in receiving power grids with new energy integration based on causal relationships |
| LI Dahu1,XIAO Bo2,RAO Yuze1,ZHOU Hongyu2,ZENG Peng1,YAO Wei2,WEN Jinyu2 |
| (1. State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China; 2. National Key Laboratory of Strong
Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan 430074, China) |
| Abstract: |
| With the continuous development of ultra-high-voltage direct current (UHVDC) transmission and new energy, the coupling relationship among AC, DC, and new energy in receiving power grids has become increasingly complex. Improper handling of a single AC fault can easily lead to systematic cascading failures, posing a serious threat to the safe operation of receiving power grids. To reveal the evolution mechanisms of cascading failures in receiving power grids, this paper first derives the causal relationships among key events, including DC commutation failure, high/low voltage ride-through and disconnection of new energy sources, and DC blocking. Subsequently, the impact of DC commutation failure on the low-voltage ride-through performance of new energy under different tie-line impedances and commutation failure prevention (CFPREV) control are analyzed. Finally, based on causal relationships, the evolution mechanisms and paths of cascading failure in receiving power grids are revealed. A complex receiving-end power grid model is built in PSCAD/EMTDC, and typical cascading fault simulation cases are conducted to verify the correctness of the proposed analysis of cascading failure evolution paths and mechanisms. |
| Key words: receiving-end grid commutation failure DC blocking cascading tripping of new energy causal relationship cascading failure evolution |
