摘要
与交流电网相比,直流电网具有传输容量大、灵活性高等优势。变电站操作电源、智能楼宇后备电源、舰船动力电源以及大容量充电系统都采用直流电网。但是目前的直流电网普遍缺乏自动化监控系统,尤其对于直流电网拓扑辨识技术的研究偏少。针对直流电网量测数据少、可靠性要求高等实际情况,提出基于锥规划的直流电网拓扑辨识优化方法。首先,根据直流电网馈线电压、电流量测值,建立区段-电压电流量测关联矩阵;其次,提取区段-电压电流量测关联矩阵的变化特征,建立关联矩阵阈值评价指标;然后,针对辨识的多解问题,构建上级电流与量测电流相差最小的锥规划模型,基于单形分解和历史数据填补方法,提出锥规划的近似求解算法;最后,通过MATLAB/Simulink仿真算例,验证所提方法的有效性。
Compared with AC power distribution network,DC power network has the advantages of large transmission capacity and high flexibility.DC power grid is used for substation operation power supply,intelligent building backup power supply,ship power supply and large capacity charging system.However,the current DC power grid generally lacks automatic monitoring system,especially the research on DC power grid topology identification technology.In this paper,an optimization method of DC network topology identification based on cone programming is proposed for DC network with less measured data and higher reliability requirements.Firstly,according to the voltage and current measurement values of the feeder of DC network,the sectionvoltage current measurement correlation matrix is established.Then,the variation characteristics of the section-voltage amperage measurement correlation matrix are extracted,and the threshold evaluation index of the correlation matrix is established.To solve the multi-solution problem,a cone programming model with the minimum difference between the superior current and the measured current is established.An approximate solution algorithm for the cone programming is proposed based on the simplex decomposition and historical data filling method.Finally,an example system of MATLAB/Simulink is used to verify the effectiveness of the proposed method.
作者
李亮玉
高铭
葛朝晖
张骥
赵贤龙
葛海涛
李江
LI Liangyu;GAO Ming;GE Chaohui;ZHANG Ji;ZHAO Xianlong;GE Haitao;LI Jiang(State Grid Hebei Economic Research Institute,Shijiazhuang 050021,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;State Grid Hebei Shijiazhuang Electric Power Company,Shijiazhuang 050021,China)
出处
《供用电》
2022年第10期66-74,共9页
Distribution & Utilization
基金
国家自然科学基金项目(51977030)
国网河北省电力有限公司科技项目(KJ2019-053)。
关键词
拓扑辨识
智能电表
直流电网
故障区段
锥规划
topology identification
smart meter
direct current distribution network
fault section
conic programming
