摘要
故障电流计算是柔性直流电网设计与规划、故障类型判断的重要环节,开展相关问题的深入研究尤为重要。基于电路理论和数值积分原理,针对合理简化后的电路提出了一种基于动态元件离散化的故障电流数值计算方法。首先,通过电路理论分析故障放电机理,对电网进行合理的简化;然后,通过后向欧拉法对动态元件进行离散化处理,建立简化后电路的离散模型;最后,基于简化后电路的离散模型建立改进节点方程,求得各时刻的故障电流值。通过将所提方法的计算结果与在PSCAD/EMTDC中搭建的柔性直流电网仿真模型的结果进行对比分析,验证了所提方法的可行性与通用性。
The calculation of fault current is an important link in the design and planning of flexible DC power network and the judgment of fault type.Based on the circuit theory and numerical integration principle,a numerical calculation method of fault current based on the discretization of dynamic components was proposed.First,the circuit theory was used to analyze the fault discharge mechanism to simplify the power network reasonably,then the dynamic components were discretized by the backward euler method,and the discrete model of the simplified circuit was established,based on the simplified discrete model of the circuit,an improved nodal equation was established to calculate the fault current at each time.The feasibility and generality of the proposed method were verified by comparing the results of the proposed method with the results of the simulation model of the VSC-HVDC grid built in PSCAD/EMTDC.
作者
刘晓悦
项心茹
康健
张怡
LIU Xiao-yue;XIANG Xin-ru;KANG Jian;ZHANG Yi(College of Electrical Engineering,North China University of Science and Technology,Tangshan 063200,China)
出处
《科学技术与工程》
北大核心
2022年第34期15171-15179,共9页
Science Technology and Engineering
基金
国家自然科学基金(61803154)。
关键词
故障电流计算
直流电网
后向欧拉法
离散
fault current calculation
DC grid
backward euler method
discrete
