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中文摘要：
将短路比与单直流系统谐振频率的关系推广到多直流系统中，详细分析了交流系统等值阻抗与谐振频率的关系，表明在单直流或多直流系统中，其谐振频率主要受本直流所联交流系统阻抗的影响。采用PSCAD进行频谱分析，验证了所提出的多直流系统谐振频率计算方法的有效性。
英文摘要：
This paper expands the relationship between short circuit ratio and resonant frequency of single DC system to muhi-DC system. The correlation between AC system equivalent impedance and resonant frequency is analyzed in detail. The results show that in a single or multiple DC system, the resonant frequency is mainly affected by the con- nected AC system impedance. The PSCAD-based frequency analysis verifies the effectiveness of the proposed resonant frequency algorithm for muhi-DC system.
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