电网技术2024，Vol.48Issue(7)：2958-2966,中插87-中插93,16.DOI:10.13335/j.1000-3673.pst.2023.0816
柔性直流电网故障暂态电压和电流特征分析方法
A Features Analysis Method of the Transient Fault Voltages and Currents for Flexible DC Grids After DC Line Faults
摘要
Abstract
Accurate analysis of transient features of voltages and currents for fllexible DC grids after DC faults is the theoretical basis of fault protection scheme design.The existing fault characteristic analysis methods using the initial traveling wave fail to effectively reflect the influence of the fault point on multiple refractions and reflections of fault traveling waves,which will produce large errors in case of a close-in fault.Using the established fault equivalent circuit of the flexible DC grid,the initial fault voltage at the fault point,the refraction and reflection coefficients at different positions,and the line-mode and ground-mode coupling coefficient at the fault point are acquired.A calculation method of the equivalent fault voltage at the fault point is proposed considering multiple refractions and reflection of the traveling wave.The numerical expressions of the transient voltages and currents can be obtained with the transfer functions of the fault voltages and currents at different positions.To simulate the fault,a ring topology four-terminal flexible DC grid simulation model is built in PSCAD/EMTDC.The correctness of the theoretical derivation is verified by comparing the simulation value with the theoretical calculation value.关键词
柔性直流电网/故障电压和电流行波/数值表达式/多次折射和反射/传递函数Key words
flexible DC grids/fault voltage and current traveling waves/numerical expression/multiple refractions and reflections/transfer function分类
信息技术与安全科学引用本文复制引用
余修勇,顾菊平,张新松,茅靖峰,肖立业..柔性直流电网故障暂态电压和电流特征分析方法[J].电网技术,2024,48(7):2958-2966,中插87-中插93,16.基金项目
国家自然科学基金项目(U2066203,51877112) （U2066203,51877112）
江苏省高校自然科学研究项目(23KJB470034) （23KJB470034）
南通市基础科学研究项目(JC12022050).Project Supported by National Natural Science Foundation of China(NSFC)(U2066203,51877112) （JC12022050）
Natural Science Research Program of Jiangsu Colleges and Universities(23KJB470034) （23KJB470034）
Science and Technology Research Program of Nantong(JC12022050). （JC12022050）
