| 引用本文: | 李振兴,安 喆,朱 益,等.负序电流突变下基于动态热能模型的反时限保护曲线修正方案[J].电力系统保护与控制,2025,53(18):26-38.[点击复制] |
| LI Zhenxing,AN Zhe,ZHU Yi,et al.Correction scheme for inverse time protection curve based on dynamic thermal energy model under negative sequence current sudden change[J].Power System Protection and Control,2025,53(18):26-38[点击复制] |
|
| 本文已被：浏览 771次 下载 76次 |
码上扫一扫！ |
| 负序电流突变下基于动态热能模型的反时限保护曲线修正方案 |
| 李振兴1,2,安喆1,朱益1,胡聪1,翁汉琍1,2,李振华1,2 |
|
|
| (1.三峡大学电气与新能源学院，湖北 宜昌 443002;2.新能源微电网湖北省
协同创新中心(三峡大学)，湖北 宜昌 443002) |
|
| 摘要: |
| 针对发电机常规负序电流反时限保护无法准确刻画负序电流突变后保护动作时间问题，提出一种适应负序电流突变的基于动态热能模型的反时限保护曲线修正方法。首先，分析了基于新能源控制的发电机机端负序抑制策略以及在送出线路非全相期间的负序电流变化关系，提出应对负序电流三阶段变化的反时限保护动作方案。然后，考虑非周期分量发热、对流辐射散热，基于实时测量负序电流构建反映转子温度的动态热能模型。最后，将此模型融入负序反时限保护，利用定、转子稳态运行温度和预设负序电流刻画反时限保护动作曲线，并提出以输入实时负序电流推算转子温度为基础的反时限保护曲线修正方案。仿真实验结果表明：所构建的动态热能模型能精确刻画转子温度，基于此提出的保护曲线刻画、修正方案具有较高的准确性和较强的适应性。 |
| 关键词: 负序反时限保护 负序电流突变 动态热能模型 保护曲线修正 |
| DOI：10.19783/j.cnki.pspc.240739 |
| 投稿时间：2024-06-21修订日期：2024-09-02 |
| 基金项目:国家自然科学基金项目资助(52077120) |
|
| Correction scheme for inverse time protection curve based on dynamic thermal energy model under negative sequence current sudden change |
| LI Zhenxing1,2,AN Zhe1,ZHU Yi1,HU Cong1,WENG Hanli1,2,LI Zhenhua1,2 |
| (1. College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China; 2. Hubei
Provincial Collaborative Innovation Center for New Energy Microgrid, Three Gorges University, Yichang 443002, China) |
| Abstract: |
| To address the problem that conventional negative sequence inverse time overcurrent protection for generators cannot accurately characterize the protection’s action time after sudden changes in negative sequence current, a correction approach for the negative sequence inverse time overcurrent protection curve based on the dynamic thermal energy model is proposed. First, the generator terminal negative sequence suppression strategy under new energy control and the variation of negative sequence current during unbalanced transmission line operation are analyzed. A negative sequence inverse time overcurrent protection action scheme is proposed to address the three-stage changes of negative sequence current. Then, a dynamic thermal energy model reflecting the rotor temperature is established based on the real-time measurement of negative sequence current, considering the non-periodic component heat generation and convective radiation heat dissipation. Finally, the model is incorporated into the negative sequence inverse time overcurrent protection, where steady-state temperatures of stator and rotor along with preset negative sequence current are used to characterize the negative sequence inverse time overcurrent protection curve. A correction scheme for the protection curve is further proposed that adjusts the curve based on rotor temperature estimated from real-time negative sequence current inputs. Simulation results show that the constructed dynamic thermal energy model can accurately capture rotor temperature, and the proposed curve characterization and correction scheme achieves high accuracy and strong adaptability. |
| Key words: negative sequence inverse time overcurrent protection negative sequence current sudden change dynamic thermal energy model protection curve correction |
