柔性直流配电网中压直流侧典型故障仿真分析  

Simulation and Analysis of Typical Faults on MVDC Side of Flexible DC Distribution Network

作　　者：徐辰翔 高辉[1] 张安越 XU Chen-xiang;GAO Hui;ZHANG An-yue(Nanjing University of Posts and Telecommunications,Jiangsu Nanjing 210023,China)

机构地区：[1]南京邮电大学,江苏南京210023

出　　处：《计算机仿真》2022年第8期496-502,共7页Computer Simulation

基　　金：多端柔性直流配电网暂态运行特性及保护控制技术研究(5211DS170016)。

摘　　要：针对柔性直流配电网保护技术面临的诸多挑战,提出一种适用于柔性直流配电网直流线路典型故障的故障研判方法。首先分析多端柔性直流配电网典型拓扑结构,提出模块化多电平换流器简化模型,研究了换流器的调制方法和控制模型,分析在换流器出线后的中压直流侧典型故障后端电流电压特性曲线,最后通过PSCAD构建基于模块化多电平换流器的柔性直流配电网,通过仿真分析得出故障量变化,从而设计满足柔直配电网系统要求的直流线路保护方案。In view of the challenges faced by the protection technology of flexible DC distribution network,a fault diagnosis method for typical DC line faults of flexible DC distribution network is proposed.First,the typical topology of multi terminal flexible DC distribution network was analyzed,and a simplified model of modular multilevel converter was proposed.The modulation method and control model of the converter were studied,and the back-end current and voltage characteristic curve of typical faults on the medium voltage DC side was analyzed after the converter was outgoing.Finally,a flexible DC distribution network based on modular multilevel converter was constructed through PSCAD,and the change of fault quantity was obtained through simulation analysis,so as to design a DC line protection scheme that meets the requirements of the flexible DC distribution network system.

关 键 词：柔性直流 模块化多电平换流器 模型搭建 故障仿真 

分 类 号：TM773[电气工程—电力系统及自动化]