| 引用本文: | 娄 杰,李 俊,武小梅,等.基于动态时间规整重构序列修正贝杰龙模型的多端直流电网自适应重合方法[J].电力系统保护与控制,2025,53(13):128-141.[点击复制] |
| LOU Jie,LI Jun,WU Xiaomei,et al.Adaptive reclosing method for multi-terminal DC grids based on modifying the Bergeron model through dynamic time warping reconstructed sequence correction[J].Power System Protection and Control,2025,53(13):128-141[点击复制] |
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| 摘要: |
| 多端直流电网架空线路故障概率高、设备耐受过电流能力有限，无选择性的重合将严重危害一次设备的安全性和电网的稳定性，因此提出了一种基于动态时间规整(dynamic time warping, DTW)的重构序列重合方法，实现重合前故障性质的预判。首先介绍了直流线路的贝杰龙时域等值建模方法，在此基础上，建立了各关键一次设备的贝杰龙等值模型，分析了瞬时性、永久性故障工况下模型等效时域波过程的差异性。然后以瞬时性故障为基准，对直流断路器注入信号所引发的电气分量暂态成分进行理论计算，并借助DTW重构序列量化整定门槛、进一步消除色散误差，最终以此为指标构造判据实现故障性质的识别。基于PSCAD/EMTDC平台的四端直流电网仿真算例显示，所提出的自适应重合方法仅需要单端量，不依赖通信，能够消除死区，且拥有600 Ω的灵敏性。 |
| 关键词: 多端直流电网 贝杰龙法 波过程 重合闸 |
| DOI：10.19783/j.cnki.pspc.241397 |
| 投稿时间：2024-03-31修订日期：2024-08-25 |
| 基金项目:国家自然科学基金项目资助(51907069)；广东省自然科学基金项目资助(2024A1515012720，2023A1515240010) |
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| Adaptive reclosing method for multi-terminal DC grids based on modifying the Bergeron model through dynamic time warping reconstructed sequence correction |
| LOU Jie2,LI Jun2,WU Xiaomei2,TONG Ning2,WANG Yu2,SUN Kaiqi1 |
| (1. School of Electrical Engineering, Shandong University, Jinan 250061, China;
2. School of Automation, Guangdong University of Technology, Guangzhou 510006, China) |
| Abstract: |
| Due to the high fault probability of overhead lines in multi-terminal DC grids and limited overcurrent tolerance of equipment, non-selective reclosing can severely compromise equipment safety and grid stability. To mitigate these risks, a reclosing strategy utilizing dynamic time warping (DTW)-based sequence reconstruction is developed to enable accurate fault nature identification before reclosing. First, the time-domain equivalent modeling of DC lines using the Bergeron method is introduced. On this basis, equivalent Bergeron models of key primary equipment are established, and differences in equivalent time-domain waveform processes under transient and permanent fault conditions are analyzed. Taking transient faults as the benchmark, the theoretical calculations of the transient electrical components induced by the injection signals of the DC circuit breakers are conducted. The DTW reconstruction sequence is then used to quantify the setting thresholds and eliminate dispersion errors. This forms the basis for constructing a criterion to identify the nature of the fault. Simulation case studies based on a four-terminal DC grid using PSCAD/EMTDC demonstrate that the proposed adaptive reclosing method requires only single-ended measurements, does not rely on communication, eliminates dead zones, and possesses a sensitivity of 600 . |
| Key words: MTDC Bergeron method wave process reclosing |
