源网协同限流下柔性直流电网最小熵状态估计纵联保护

郑宗生; 吴天池; 廖建权; 曾维刚; 王强钢; 周念成

doi:10.19912/j.0254-0096.tynxb.2025-0661

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太阳能学报 ›› 2026, Vol. 47 ›› Issue (9) : 482-492. DOI: 10.19912/j.0254-0096.tynxb.2025-0661

源网协同限流下柔性直流电网最小熵状态估计纵联保护

郑宗生¹, 吴天池¹, 廖建权¹, 曾维刚¹, 王强钢², 周念成²

作者信息 +

PILOT PROTECTION METHOD FOR FLEXIBLE DC GRID BASED ON RECURSIVE MINIMUM ERROR ENTROPY STATE ESTIMATION UNDER SOURCE-GRID COORDINATED CURRENT LIMITING

Zheng Zongsheng¹, Wu Tianchi¹, Liao Jianquan¹, Zeng Weigang¹, Wang Qianggang², Zhou Niancheng²

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文章历史 +

摘要

针对限流劣化导致传统纵联保护拒动的问题,提出一种基于模型匹配的递归最小熵状态估计纵联保护方法,在提升算法鲁棒性的同时可避免限流对保护的影响。首先分析故障限流下含电流型潮流控制器（CFC）的金属回流双极直流电网的故障特性,阐述传统电流差动保护的局限性;建立精确的线路等值模型并推导系统量测方程,通过二次积分完成方程离散化;最后引入递归最小误差熵算法对状态估计模型求解,根据模型匹配程度识别区内外故障,并根据故障电流模分量提出故障选极策略。仿真结果表明,该方法可在故障后2 ms内快速准确识别区内外故障并正确选极,同时有较强的耐受限流、过渡电阻、噪声干扰等能力。

Abstract

To address the issue that current limiting degrades fault characteristics and may cause conventional pilot protection to malfunction, this paper proposes a recursive minimum error entropy pilot protection method based on model matching, which improves algorithm robustness and eliminates the adverse influence from current limiting. This paper firstly analyzes the fault characteristics of metallic return bipolar DC grids with CFC under current limiting conditions and explains the drawbacks of traditional current differential protection. An accurate line equivalent model is then established to derive system measurement equations, which are discretized by “quadratic integration” into algebraic equations. Finally, the recursive minimum error entropy algorithm is introduced to solve the state estimation model: the internal and external faults are identified according to the model matching degree, and a fault pole selection strategy is proposed according to the fault current mode component. The simulation results show that the method can quickly and accurately recognize the internal and external faults and correctly select poles within 2 ms after fault inception, with strong ability against current limiting, transition resistance and noise interference.

导出引用

郑宗生, 吴天池, 廖建权, 曾维刚, 王强钢, 周念成. 源网协同限流下柔性直流电网最小熵状态估计纵联保护[J]. 太阳能学报. 2026, 47(9): 482-492 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0661

Zheng Zongsheng, Wu Tianchi, Liao Jianquan, Zeng Weigang, Wang Qianggang, Zhou Niancheng. PILOT PROTECTION METHOD FOR FLEXIBLE DC GRID BASED ON RECURSIVE MINIMUM ERROR ENTROPY STATE ESTIMATION UNDER SOURCE-GRID COORDINATED CURRENT LIMITING[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 482-492 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0661

中图分类号： TM773

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