基于负序电流比的主动配电网断线故障保护方法

杜雪; 肖扬; 付滨; 欧阳金鑫; 刘兵; 黄亮程

杜雪,肖扬,付滨,欧阳金鑫,刘兵,黄亮程.基于负序电流比的主动配电网断线故障保护方法[J].电测与仪表,2021,58(7):57-66.
Du Xue,Xiao Yang,Fu Bin,Ouyang Jinxin,Liu Bing,Huang Liangcheng.Break fault protection method of active distribution network based on negative sequence current ratio[J].Electrical Measurement & Instrumentation,2021,58(7):57-66.

基于负序电流比的主动配电网断线故障保护方法

Break fault protection method of active distribution network based on negative sequence current ratio

DOI：10.19753/j.issn1001-1390.2021.07.008

中文关键词: 主动配电网分布式电源断线故障断线保护负序电流

英文关键词:active distribution network, distributed generation, break fault, protection, negative-sequence current

基金项目:国家自然科学基金项目（51877018）

作者中文名	作者英文名	单位
杜雪	Du Xue	贵州电网有限责任公司贵阳供电局
肖扬	Xiao Yang	输配电装备及系统安全与新技术国家重点实验室重庆大学
付滨	Fu Bin	贵州电网有限责任公司贵阳供电局
欧阳金鑫	Ouyang Jinxin	输配电装备及系统安全与新技术国家重点实验室重庆大学
刘兵	Liu Bing	贵州电网有限责任公司贵阳供电局
黄亮程	Huang Liangcheng	贵州电网有限责任公司贵阳供电局

摘要点击次数: 1428

中文摘要:

随着分布式电源(DG)的大规模接入以及对用电要求的不断提高,具有主动控制、协调、管理能力的主动配电网(ADN)成为电力系统的发展趋势之一。但是,由于ADN的结构及运行模式复杂,断线故障的发生大大降低了ADN的效益价值,严重威胁设备与人身安全。由于断线故障对于传统配电网的影响有限,目前针对断线故障的保护技术较为欠缺。特别是在ADN中,由于受DG及灵活可调拓扑的影响,断线故障的准确识别和保护还难以实现。为此,分析了ADN的特征及其对断线故障保护的影响；解析分析了DG上、下游单相及两相断线下故障馈线与非故障馈线序电流的变化特征；在此基础上,以负序电流比作为保护特征量,提出了一种基于负序电流比的主动配电网断线故障保护方法。理论和仿真分析结果表明,该方法不受负荷分布和故障位置影响,适用于各种网络拓扑、DG容量以及中性点接地方式,具有较好的适用性和灵敏度。

英文摘要:

With the large-scale access of distributed generation (DG) and the continuous increase in power requirements, active distribution network (ADN) with active control, coordination and management capabilities has become one of the development trends of power system. However, due to the complex structure and operating mode, the occurrence of break fault greatly reduces the value of ADN, which seriously threatens the safety of equipment and people. Due to the limited influence of break fault on the traditional distribution network, the present break fault protection technology is insufficient. Especially in ADN, due to the influence of DG and the flexible and adjustable topology, accurate identification and protection of break fault are still difficult to achieve. For this reason, this paper analyzes the characteristics of ADN and its influence on break fault protection. And the variation characteristics of sequence current of fault feeder and non-fault feeder under single - phase and two - phase break fault are analyzed. On this basis, an active distribution network fault protection method based on negative sequence current ratio is proposed, which takes the negative sequence current ratio as the protection characteristic parameter. The theoretical and simulation results show that the method is not affected by load distribution and fault location, and is suitable for various network topologies, DG capacity and neutral grounding modes, with high applicability and sensitivity.

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