交直流系统对多馈入短路比的影响研究  

A Study on the Influence of AC/DC System on MISCR

作　　者：王书杰 文俊[1] 牛宇昆 马立民 WANG Shujie;WEN Jun;NIU Yukun;MA Limin(North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学,北京102206

出　　处：《电网与清洁能源》2021年第9期1-8,共8页Power System and Clean Energy

基　　金：国家重点研发计划智能电网技术与装备重点专项(2016YFB0900604)。

摘　　要：多馈入短路比(MISCR)是反映含多馈入直流输电系统的受端电网强度的重要指标,但现有研究中一些文献对于多馈入短路比存在理解偏差。该文首先从多馈入短路比的定义出发,介绍两种表达方法:等值阻抗法和影响因子法,并以n回直流馈入为例对两种方法的一致性加以证明;分析直流馈入回路数增加时多馈入短路比的变化规律,剖析现有的个别文献误以为MISCR可能高于单馈入短路比的本质原因;最后对影响多馈入短路比的各种因素,如直流额定功率、戴维南等值阻抗以及联络阻抗进行了仿真分析。The multi-infeed short circuit ratio(MISCR)is an important index to reflect the strength of the AC system of the DC transmission system.However,there are some misunderstandings about the multi-infeed short circuit ratio in the existing research.Based on the definition of MISCR,this paper introduces two expression methods:equivalent impedance method and influence factor method,and proves the consistency of the two methods by taking N-back DC feed-in as an example.The variation rule of MISCR when the number of DC feed-in loops increases is analyzed,and the essential reason of that that MISCR may be higher than single feed-in short circuit ratio in some existing literatures is analyzed.Finally,various factors affecting the multi-infeed short circuit ratio(SCR),such as DC rated power,Davenan equivalent impedance and connection impedance,are simulated and analyzed.

关 键 词：多馈入直流 短路比 多馈入短路比 受端电网 等值阻抗 多馈入交互作用因子 

分 类 号：TM712[电气工程—电力系统及自动化]