摘要
准确定位电压暂降源,对提高供电可靠性、明确供需双方责任具有重要意义。目前,基于有限电能质量(PQ)监测点量测数据和配电自动化提供的网络实时信息,通过短路电流计算,进行配电网电压暂降源精确定位成为研究热点之一。但现有方法存在不区分暂降源类型,需遍历所有母线、计算量大、过渡电阻估计不准确影响定位精度、难以适用于多源主动配电网等不足。该文提出一种适用于主动配电网的电压暂降源精确定位策略。针对基于序功率增量方向原理确定的暂降源候选区域,进行电压暂降成因辨识。对于由短路故障引起的电压暂降,基于考虑分布式电源接入和过渡电阻影响的主动配电网短路电流计算方法,以故障位置、过渡电阻为优化变量,以最小化有限观测点处故障电流、电压的计算值与观测值误差为目标,建立寻找最邻近母线和寻找准确故障位置的分步优化模型并采用智能优化算法求解,实现精确定位。基于改进IEEE 34节点配电网算例验证了本文方法的有效性,并通过与现有方法的结果比较说明了所提方法的优越性。
Precise locating of voltage sag source has important significance in promoting power supply dependability and clarifying responsibilities. As a hot research spot, a series of researches were carried out with the help of power quality (PQ) monitoring system and distribution automation system in recent years. However, existing locating methods fail to distinguish the type of sag source and need to search all the buses. Moreover, they are merely applied to traditional radial distribution grid with single power supply, and the locating accuracy is non-ideal as inaccurate estimation of transition resistance. In this paper, a precise locating strategy applied to active distribution grid with multiple distributed generators, is put forward. Firstly, the potential distribution area of voltage sag source is narrowed by the directions of sequence power increments. Then, type of sag source is identified to guide locating. For voltage sag caused by short-circuit fault, a step-by-step optimization model, which aims at minimizing the differences between the measured data and the calculated data at limited observations, is established. As the basis, impacts of distributed generators and transition resistance are considered in short-circuit calculation. Finally, based on the modified IEEE 34-node benchmark, the validity and superiorities of the proposed strategy are verified.
作者
陈汝斯
林涛
毕如玉
徐遐龄
齐清
Chen Rusi;Lin Tao;Bi Ruyu;Xu Xialing;Qi Qing(School of Electrical Engineering Wuhan University, Wuhan 430072 China;State Grid Hubei Electric Power Research Institute ,Wuhan 430077 China;Solar Energy Efficient Use Collaborative Innovation Center of Hubei Province ,Wuhan 430068 China;Central China Branch of State Grid Corporation of China, Wuhan 430077 China;State Grid Beijing Electric Power Company ,Beijing 100031 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第A01期312-320,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金面上项目(51177111)
太阳能高效利用湖北省协同创新中心重大专项(HBSZD2014003)资助
关键词
主动配电网
电压暂降源定位
分步优化模型
短路电流计算
序功率增量方向
Active distribution grid
locating of voltage sag source
step-by-step optimization model
short-circuit calculation
directions of sequence power increments
