| 引用本文: | 高强强,侯俊杰,樊艳芳,等.适用于双端弱馈交流系统的改进型电流差动保护[J].电力系统保护与控制,2025,53(12):69-81.[点击复制] |
| GAO Qiangqiang,HOU Junjie,FAN Yanfang,et al.Improved current differential protection for two-terminal weak feed AC system[J].Power System Protection and Control,2025,53(12):69-81[点击复制] |
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| 适用于双端弱馈交流系统的改进型电流差动保护 |
| 高强强1,侯俊杰1,樊艳芳1,宋国兵1,2,曹润彬3,李岩3,黄伟煌3,吴小芳4 |
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| (1.新疆大学电气工程学院，新疆 乌鲁木齐 830046;2.西安交通大学电气工程学院，陕西 西安 711049;
3.直流输电技术全国重点实验室(南方电网科学研究院有限责任公司)，广东 广州 510663;
4.国网新疆电力有限公司电力科学研究院，新疆 乌鲁木齐 830011) |
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| 摘要: |
| 新能源经柔直送出工程成为规模化新能源并网的必然发展趋势，其双端弱馈交流系统往往由100%电力电子型电力设备组成，线路两端换流器故障后采取的传统故障控制策略使得故障电流受限，导致传统电流差动保护性能降低。在结合传统控制策略下双端弱馈交流系统电流差动保护问题的基础上，提出一种基于负序协同控制策略的双端弱馈交流系统电流差动保护方案。首先，从理论上推导了双端弱馈交流系统的故障特征，给出了能够量化电流差动保护动作性能的边界函数。其次，结合改进型故障控制协同策略分析了控制策略改进后电流差动保护的动作边界及其灵敏度。最后，结合动作边界、灵敏度和自适应校正函数，提出了基于自适应校正函数的双端弱馈交流系统改进型电流差动保护方案。仿真结果表明，所提保护方案在过渡电阻为300 和25 dB噪声干扰下均能够可靠识别故障，能够适应双端弱馈交流系统不同场景下的保护需求且具有更高的灵敏度。 |
| 关键词: 双端弱馈交流系统 电流差动保护 负序控制策略 自适应校正函数 灵敏度 |
| DOI：10.19783/j.cnki.pspc.240655 |
| 投稿时间：2024-05-28修订日期：2024-12-13 |
| 基金项目:国家重点研发计划项目资助(2021YFB1507000)；南网科研院科技项目资助(SEPRI-K22B055)；新疆维吾尔自治区自然科学基金项目资助(2022D01C662)；“天山英才培养”计划项目资助(2022TSYCLJ0019) |
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| Improved current differential protection for two-terminal weak feed AC system |
| GAO Qiangqiang1,HOU Junjie1,FAN Yanfang1,SONG Guobing1,2,CAO Runbin3,LI Yan3,HUANG Weihuang3,WU Xiaofang4 |
| (1. School of Electrical Engineering, Xinjiang University, Urumqi 830046, China; 2. School of Electrical Engineering,
Xi’an Jiaotong University, Xi’an 711049, China; 3. State Key Laboratory of HVDC (Electric Power Research
Institute, China Southern Power Grid), Guangzhou 510663, China; 4. Electric Power Research
Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830011, China) |
| Abstract: |
| The transmission of renewable energy via flexible DC systems has become an inevitable development trend for large-scale renewable energy grid integration. The associated two-terminal weak feed (TTWF) AC systems are often composed of 100% power electronic equipment. Traditional fault control strategies adopted by the converters at both ends of the line after a fault lead to limited fault currents, thereby reducing the effectiveness of conventional differential protection. Based on the challenges in current differential protection in TTWF AC systems under conventional control strategies, a current differential protection scheme based on negative-sequence control coordination strategy is proposed. First, the fault characteristics of TTWF AC systems are theoretically derived, and a boundary function is presented to quantitatively assess the performance of current differential protection actions. Secondly, the action boundary and sensitivity of current differential protection with the improved fault control coordination strategy are analyzed. Finally, combining the action boundary, sensitivity and adaptive function, an improved current differential protection scheme based on adaptive function is proposed. Simulation results show that the proposed protection scheme can reliably identify faults even under conditions of a 300 fault resistance and 25 dB noise interference. It is well-suited for the protection requirements of TTWF AC systems under various scenarios and demonstrates higher sensitivity. |
| Key words: two-terminal weak feed AC system current differential protection negative-sequence control strategy adaptive correction function sensitivity |
