| 交直流系统对多馈入短路比的影响研究 |
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| 引用本文：王书杰,文俊,牛宇昆,马立民.交直流系统对多馈入短路比的影响研究[J].电网与清洁能源,2021,37(9):1~8 |
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| 基金项目:国家重点研发计划智能电网技术与装备重点专项（2016YFB0900604） |
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| 中文摘要: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。 |
| 中文关键词: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 |
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| A Study on the Influence of AC/DC System on MISCR |
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| Abstract: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. |
| keywords:multi-infeed direct current short circuit ratio multi-infeed short circuit ratio AC system equivalent impedance multi-infeed interaction factor |
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