| 引用本文: | 瞿艳霞,时伯年,刘志超,张岩,迟忠君.基于视在阻抗角的失步解列判据改进研究[J].电力系统保护与控制,2020,48(5):181-187.[点击复制] |
| QU Yanxia,SHI Bonian,LIU Zhichao,ZHANG Yan,CHI Zhongjun.Improvement of out-of-step separation criterion based on apparent impedance angle[J].Power System Protection and Control,2020,48(5):181-187[点击复制] |
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| 摘要: |
| 当电网结构存在隐患时，易因事故诱发系统失步振荡。阻抗角失步解列判据作为应用最广的失步判据，其优势十分明显，同时也存在一定缺陷，即在短路暂态过程中易发生误判。通过对典型视在阻抗角判据理论的深入研究，提出一种采用电压包络线上沿门槛作解锁条件的判据改进方案。该方案能严格区分短路与失步过程，提升视在阻抗角失步判据对特定工况及新型电网结构的适应性。最后在PSCAD/EMTDC中通过简化的实例模型验证改进判据的有效性。 |
| 关键词: 暂态稳定 失步解列 视在阻抗角 判据 |
| DOI：10.19783/j.cnki.pspc.190522 |
| 投稿时间：2019-05-10修订日期：2019-07-15 |
| 基金项目:国家电网公司科技项目资助“特大型电网系统级控制保护技术框架研究与设计”(SGBJDK00KJJS900088) |
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| Improvement of out-of-step separation criterion based on apparent impedance angle |
| QU Yanxia,SHI Bonian,LIU Zhichao,ZHANG Yan,CHI Zhongjun |
| (Beijing Sifang Automation Co., Ltd., Beijing 100085, China;State Grid Beijing Electric Power Research Institute, Beijing 100075, China) |
| Abstract: |
| When there are hidden troubles in power grid structure, it is easy to cause system out-of-step oscillation due to accidents. Impedance angle out-of-step separation criterion is the most widely used criterion. Its advantages are obvious, but there are also some shortcomings, that is, it is easy to misjudge in short-circuit transient process. In this paper, based on the in-depth study of the typical apparent impedance angle criterion theory, an improved criterion using maximum threshold of voltage envelope as unlocking condition is proposed. The scheme can strictly distinguish short circuit from out-of-step process, and improve the adaptability of apparent impedance angle out-of-step criterion to specific operating conditions and new power grid structure. Finally, the validity of the improved criterion is verified by a simplified example model in PSCAD/EMTDC. This work is supported by Science and Technology Project of State Grid Corporation of China “Framework Research and Design of Super Large-scale Power Grid System-level Control and Protection Technology” (No. SGBJDK00KJJS900088). |
| Key words: transient stability out-of-step separation apparent impedance angle criterion |
