| 引用本文: | 张雨乐,尹纯亚,李凤婷,等.考虑多馈入系统无功电压特性的同时换相失败评估方法[J].电力系统保护与控制,2024,52(21):170-187.[点击复制] |
| ZHANG Yule,YIN Chunya,LI Fengting,et al.A simultaneous commutation failure assessment method considering reactive powerand voltage characteristics in multi-infeed HVDC systems[J].Power System Protection and Control,2024,52(21):170-187[点击复制] |
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| 摘要: |
| 针对目前基于多馈入相互作用因子(multi-infeed interaction factor, MIIF)同时换相失败评估准确度不足的问题，首先阐明了多馈入高压直流系统中交流系统故障后暂态无功功率的作用机理，揭示了无功功率和电压之间复杂的相互作用对MIIF的显著影响。其次，提出了一种考虑到无功功率和电压相互作用的改进MIIF因子，用于衡量多馈入直流系统之间的相互作用，分别计算了交直流系统间无功功率不平衡引起的电压降和直流换流站间无功功率传输引起的电压变化。然后，基于最小关断角定理，综合考虑了暂态无功功率和电压特性的影响，提出了临界同时换相失败因子(critical simultaneous commutation failure factor, CSCFF)及其计算表达式。通过比较MIIF和CSCFF，提出了一种同时换相失败评估方法，在评估同时换相失败时具有更高的准确性。最后，利用PSCAD/ EMTDC平台构建了双馈入和三馈入高压直流仿真模型，验证了所提方法在不同故障类型、耦合阻抗和故障严重程度下的有效性和适用性。 |
| 关键词: 多馈入直流系统 无功功率 多馈入交互作用因子 换相失败评估方法 |
| DOI：10.19783/j.cnki.pspc.240226 |
| 投稿时间：2024-02-28修订日期：2024-07-29 |
| 基金项目:国家自然科学基金项目资助(5236070148)；新疆维吾尔自治区青年科学基金项目资助(2022D01C85) |
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| A simultaneous commutation failure assessment method considering reactive powerand voltage characteristics in multi-infeed HVDC systems |
| ZHANG Yule,YIN Chunya,LI Fengting,HAN Lu,LIU Jiangshan,SHI Yingping |
| (College of Electrical Engineering, Xinjiang University, Urumqi 830017, China) |
| Abstract: |
| There is an existing problem in that assessment of simultaneous commutation failure (CF) risk is of inadequate accuracy based on the multi-infeed interaction factor (MIIF). Thus, first, the propagation mechanism of transient reactive power after an AC system fault in a multi-infeed HVDC (MIDC) system is clarified, and the complex interactions between reactive power and voltage that have a noticeable effect on MIIF are revealed. Secondly, an improved MIIF factor considering reactive power and voltage interactions is proposed to measure the interaction between MIDC systems. The voltage drops due to reactive power imbalance between AC and DC systems and the voltage variation due to reactive power transfer between DC converter stations are calculated. Then, based on the minimum extinction angle theorem and comprehensively considering the influence of transient reactive power and voltage characteristics, a critical simultaneous commutation failure factor (CSCFF) and its calculation expression are proposed. By comparing MIIF with CSCFF, a simultaneous commutation failure assessment method is proposed, which has higher accuracy in assessing the simultaneous commutation failure. Finally, double-infeed and three-infeed HVDC simulation models are constructed using the PSCAD/EMTDC platform. These verify the validity and applicability of the proposed method with different fault types, coupling impedances and fault severities. |
| Key words: multi-infeed direct current system reactive power multi-infeed interaction factor commutation failure assessment method |
