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中文摘要：
直流系统与弱交流系统相连会出现一系列稳定问题，通常采用临界短路比（CSCR）作为准确评估交直流系统的交互影响的划分标准，在综述两种临界短路比计算方法（通过系统稳态特性方程求极值和通过IEEE工作组的定义公式）的基础上，仿真分析证明了两种计算方法的一致性，同时指出临界短路比不恒定为2。研究了临界短路比与换相电抗、熄弧角和交流系统等值阻抗角的关系，为评估系统强弱程度提出了更合理的划分值，具有更准确的指导意义。
英文摘要：
AC-DC system interaction can lead to a series of stability issues may occur if DC system is connect to weak AC system, so that needs the in order to improve system stability. Usually the critical short circuit ratio （CSCR） is accepted as the criteria to assess accurately the strength of AC-DC system interaction. Based on the review of the two CSCR calculation methods, this paper conducts simulation analysis to show the consistency of the two methods, and concludes that the inconstant critical short circuit ratio is 2. Then the relationship between critical short circuit ratio, commutation reactance, extinction angle and AC system equivalent impedance angle is analyzed to obtain the more reasonable division to assess the strength of the system, and to provide a more accurate guidance.
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