多馈入直流输电系统换相失败风险区域识别(一):计及故障期间直流电流动态特性的换相失败判别方法  

Commutation Failure Risk Areas Identification for Multi-infeed HVDC System(Part Ⅰ):A Method to Discriminate the Commutation Failure Considering the Dynamic Change of DC Current Under Fault Condition

作　　者：叶全 郭春义 YE Quan;GUO Chunyi(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources,(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2023年第21期8182-8192,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2021YFB2400900)。

摘　　要：为快速准确地识别多馈入直流输电系统的换相失败风险区域,该文首先基于稳态潮流方程给出适用于交流母线及线路不同位置故障下的多馈入直流输电系统电压交互影响因子(voltage interaction factor,VIF)计算方法;通过对故障期间暂态直流电流组成分量进行分解,得到直流电流动态特性的近似解析方法,基于此,改进已有的换相失败临界电压计算方法,并确定多馈入直流输电换相失败的边界条件,最终提出计及直流电流动态特性的换相失败判别方法。为验证所提换相失败判别方法的准确性,在PSCAD/EMTDC中搭建双馈入和三馈入直流输电系统的详细电磁暂态模型,对比理论计算结果和仿真结果之间的误差,结果表明,提出的换相失败判别方法与传统方法相比,在计及直流电流动态特性后提高了换相失败判别的准确性,该方法可为后续开展换相失败风险区域量化评估提供基础。In order to quickly and accurately identify the commutation failure risk area of the multi-infeed high voltage direct current(MIDC)system,based on the steady-state power flow equation,this paper presents a calculation method of voltage interaction factor of MIDC system for different fault positions at AC bus and line.Then,by decomposing the components of transient DC current under fault condition,an approximate analytical method for the dynamic characteristics of DC current is obtained,based on which the existing method for calculating the critical voltage of commutation failure is improved.Besides,the boundary conditions of commutation failure of MIDC system are determined,and finally a commutation failure discrimination method considering the dynamic characteristics of DC current is proposed.To verify the accuracy of the proposed commutation failure discrimination method,the detailed electromagnetic transient models of dual-infeed and three-infeed HVDC systems are modeled in PSCAD/EMTDC,and the errors between theoretical calculation results and simulation results are compared.The results show that compared with the traditional method,the proposed commutation failure discrimination method improves the accuracy of commutation failure discrimination after considering the dynamic characteristics of DC current.This method can serve as a basis of the following quantitative assessment of the commutation failure risk area.

关 键 词：多馈入直流输电 换相失败判别 直流电流动态特性 电压交互影响因子 

分 类 号：TM71[电气工程—电力系统及自动化]