| 引用本文: | 邓茂军,孙小伟,朱云峰,等.基于谐波检测的调相机失磁保护研究[J].电力系统保护与控制,2025,53(1):181-187.[点击复制] |
| DENG Maojun,SUN Xiaowei,ZHU Yunfeng,et al.Excitation loss protection strategy for a synchronous condenser based on harmonic detection[J].Power System Protection and Control,2025,53(1):181-187[点击复制] |
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| 摘要: |
| 首先对现有的调相机失磁保护进行分析，结果表明在系统低电压工况下调相机发生部分失磁故障，现有的失磁保护不能可靠动作，保护存在死区。通过研究调相机失磁后的励磁电流变化规律，得出调相机发生失磁故障后气隙合成磁势中含有高次谐波分量，将在定子绕组中产生对应的谐波电流。在此基础上，提出了一种基于谐波检测的调相机失磁保护方法。利用定子绕组中偶次谐波电流含量构建新的失磁保护策略，解决了系统低电压工况下失磁保护不能识别部分失磁故障的问题。最后，通过PSCAD/EMTDC建立了带有调相机的扎鲁特-青州±800 kV特高压直流输电模型，仿真结果验证了该方案的可行性。 |
| 关键词: 调相机 失磁保护 部分失磁 偶次谐波 谐波检测 |
| DOI：10.19783/j.cnki.pspc.240152 |
| 投稿时间：2024-02-02修订日期：2024-04-18 |
| 基金项目:国家重点研发计划项目资助(2016YFB0900603) |
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| Excitation loss protection strategy for a synchronous condenser based on harmonic detection |
| DENG Maojun1,2,SUN Xiaowei1,ZHU Yunfeng2,LI Wenzheng2,HUANG Jidong2 |
| (1. College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China;
2. XJ Electric Co., Ltd., Xuchang 461000, China) |
| Abstract: |
| First, the existing field loss protection of a synchronous condenser is analyzed. The results show that the existing protection cannot reliably act in the case of a partial field loss fault of the condenser in the low voltage condition of the system, and the protection has a dead zone. By studying the variation law of the excitation current after the loss of excitation of the synchronous condenser, it is concluded that the air gap synthetic magnetic potential contains high-order harmonic components after the loss of excitation fault of the condenser, and a corresponding harmonic current will be generated in the stator winding. Thus a method of excitation loss protection of the condenser based on harmonic detection is proposed. A new excitation loss protection strategy is constructed using the even-order harmonic current content in the stator winding. This solves the problem that the loss of excitation protection cannot identify partial loss of excitation faults in low voltage conditions of the system. Finally, a Zhalute-Qingzhou ±800 kV UHVDC transmission model with a synchronous condenser is established in PSCAD/EMTDC, and the simulation results verify the feasibility of the scheme. |
| Key words: synchronous condenser field loss protection partial field loss even-order harmonic harmonic detection |
