陈水耀,徐峰,潘武略,李跃辉,武继增,刘素梅
CHEN Shuiyao,XU Feng,PAN Wulue,LI Yuehui,WU Jizeng,LIU Sumei

• 1:国网浙江省电力有限公司
• 2:国网浙江省电力有限公司金华供电公司
• 3:北京林业大学

摘要(Abstract)：

光伏电源大量接入配电网使得配电网线路差动保护的差动电流与制动电流发生变化，传统比率制动式差动保护存在不正确动作风险。为此，在系统分析光伏所接线路两侧基频电流幅值与相角变化特性的基础上，说明光伏电源接入后传统电流差动保护存在的问题；通过推导差动保护临界动作曲线上比率制动系数与两侧电流相角之间的数学关系，提出了一种自适应调整比率制动系数的电流差动保护改进判据；基于PSCAD/EMTDC搭建了含光伏电站的配电网仿真模型，对所提保护改进策略进行了测试，验证了光伏电站高比例接入后所提保护改进策略的有效性和可靠性。
The large-scale integration of photovoltaic(PV) sources into distribution networks alters the differential current and braking current of line differential protection, leading to a risk of maloperation in traditional ratio restraint differential protection. This study analyzes the changes in the fundamental-frequency current amplitude and phase angle on both sides of the line connected to the PV source, highlighting the subsequent issues with traditional current differential protection. By deriving the mathematical relationship between the ratio restraint coefficient and the phase angles of the currents on either side, as reflected in the critical operation curve of differential protection, the paper proposes an improved adaptive current differential protection criterion for adjusting the ratio restraint coefficient. A simulation model of distribution networks with PV stations is developed using PSCAD/EMTDC to test the proposed protection strategy, demonstrating its effectiveness and reliability under high levels of PV integration.

关键词(KeyWords)： 自适应电流差动保护;比率制动系数;保护适应性;高比例光伏电站接入;线路保护
adaptive current differential protection;ratio restraint coefficient;protection adaptability;high levels of PV station integration;line protection

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（52107069）;; 国网浙江省电力有限公司科技项目（B311JH23000D）

作者(Author): 陈水耀,徐峰,潘武略,李跃辉,武继增,刘素梅
CHEN Shuiyao,XU Feng,PAN Wulue,LI Yuehui,WU Jizeng,LIU Sumei

DOI: 10.19585/j.zjdl.202501004

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