| 引用本文: | 高 超,侯俊杰,樊艳芳,等.基于LCC注入信号归一化面积差的混合多端直流输电系统永久性故障识别方案[J].电力系统保护与控制,2025,53(11):14-29.[点击复制] |
| GAO Chao,HOU Junjie,FAN Yanfang,et al.Permanent fault identification scheme for hybrid MTDC systems based on normalized area difference of LCC injected signals[J].Power System Protection and Control,2025,53(11):14-29[点击复制] |
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| 摘要: |
| 为避免混合多端直流输电系统重合于永久性故障对系统造成二次危害，提出一种基于电网换相型换流器(line commutation converter, LCC)注入信号的永久性故障识别方案。首先，利用LCC的故障控制能力，对LCC触发角施加附加控制策略实现信号注入，分析确定了注入信号的频率、时长、幅值，提出一种基于LCC的信号注入策略。其次，分析了不同故障性质下信号注入后电压在分布参数模型下的差异性，发现了不同故障性质下由于线路模型差异导致本端电压测量值与对端电压计算值幅值差异明显。最后，结合上述幅值差异性构造归一化面积差，实现永久性故障识别。结合PSCAD/EMTDC仿真结果可得，所提方案仅利用单端数据，不受数据通信影响，且无需仿真整定，能够可靠识别永久性故障，可以耐受400 Ω过渡电阻和40 dB噪声干扰，适用于1500 km及以下长度线路。 |
| 关键词: 混合多端直流输电系统 永久性故障识别 注入信号 幅值差异 归一化面积差 |
| DOI：10.19783/j.cnki.pspc.240654 |
| 投稿时间：2024-05-28修订日期：2024-08-21 |
| 基金项目:国家重点研发计划项目资助(2021YFB1507000)；新疆维吾尔自治区自然科学基金项目资助(2022D01C662)；“天池英才”引进计划项目资助；“天山英才培养”计划项目资助(2022TSYCLJ0019) |
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| Permanent fault identification scheme for hybrid MTDC systems based on normalized area difference of LCC injected signals |
| GAO Chao1,HOU Junjie1,FAN Yanfang1,SONG Guobing1,2,WU Xiaofang3,LI Pengxiao4 |
| (1. School of Electrical Engineering, Xinjiang University, Urumqi 830046, China; 2. School of Electrical Engineering,
Xi’an Jiaotong University, Xi’an 711049, China; 3. Electric Power Research Institute of State Grid Xinjiang Electric
Power Co., Ltd., Urumqi 830011, China; 4. Urumqi Power Supply Company, State Grid Xinjiang Electric
Power Co., Ltd., Urumqi 830011, China) |
| Abstract: |
| To prevent secondary damage caused by reclosing onto permanent faults in hybrid multi-terminal DC (MTDC) systems, a permanent fault identification scheme based on line commutation converter (LCC) signal injection is proposed. First, leveraging the fault control ability of LCC, an additional control strategy is applied to the LCC firing angle to realize signal injection. The frequency, duration and amplitude of the injected signal are analyzed and determined, and an LCC signal injection strategy is formulated. Secondly, the voltage difference after signal injection under different fault properties is analyzed using a distributed parameter model. It is found that due to differences in line models, there is a significant amplitude difference between the measured voltage at the local end and the calculated voltage at the remote end under different fault properties. Finally, a normalized area difference is constructed based on the above amplitude difference to realize permanent fault identification. PSCAD/EMTDC simulation results show that the proposed scheme utilizes single end data, is immune to data communication issues, requires no simulation-based parameter tuning, and can reliably identify permanent faults. It is capable of withstanding 400 Ω fault resistance and 40 dB noise interference, and is suitable for lines up to 1500 km in length. |
| Key words: hybrid MTDC power system permanent fault identification signal injection amplitude difference normalized area difference |
