抑制不同运行方式下故障电流的直流电网网架结构优化方法  

DC Grid Topology Optimization for Fault Curr

作　　者：王鹏宇 彭乔[1] 毛光亮 刘天琪[1] 印月[1] 陈思危 WANG Pengyu;PENG Qiao;MAO Guangliang;LIU Tianqi;YIN Yue;CHEN Siwei(College of Electrical Engineering,Sichuan University,Chengdu610065,Sichuan Province,China)

机构地区：[1]四川大学电气工程学院,四川省成都市610065

出　　处：《现代电力》2024年第4期659-666,共8页Modern Electric Power

基　　金：四川省科技厅国际港澳台科技创新合作项目(2022YFH0018);中央高校基本科研业务费专项资金(2021SCU12055)。

摘　　要：直流电网故障电流水平决定了限流装置成本以及换流元件寿命,而通过网架结构优化可有效降低故障电流水平。然而,现有的网架结构故障电流水平评价指标存在一定误差,且不能反映不同运行方式下的综合故障电流水平。因此,提出一种抑制不同运行方式下故障电流的直流电网网架结构优化方法。首先给出直流电网短路故障电流的计算方法;然后提出基于图论的网架结构通用表示方法,在此基础上提出正常运行方式及N–1运行方式下的故障电流水平综合评价指标;最后提出一种以抑制不同运行方式下故障电流的直流电网网架结构优化方法,并通过PSCAD/EMTDC软件在六端直流电网中验证了所提方法的有效性。The fault current level of a DC grid determines the cost of current limiting devices and the lifetime of converter components.The fault current can be effectively reduced by optimizing the DC grid topology.However,the existing fault current level evaluation index of DC grid topology is inaccurate and fails to represent the comprehensive fault current level under different operation modes.In view of this,an optimal design method for DC grid topology is proposed to restrain fault currents under different operation modes.First,the calculation method for short-circuit fault current in DC grids is presented.Then,a general representation of the grid topology is established based on graph theory,upon which the evaluation indices for fault current levels under normal operation mode and N-1 operation modes are proposed.Finally,an optimization method for DC grid topology is proposed considering the fault current levels under different operation modes.The effectiveness of our method is validated through the simulation using a six-terminal DC grid in PSCAD/EMTDC.

关 键 词：柔性直流输电 直流电网 网架结构 故障电流 运行方式 图论 

分 类 号：TM73[电气工程—电力系统及自动化]