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中文摘要：
为了提高连锁故障分析的效率，研究了交直流电网的静态等值方法。首先，将直流线路等效为交流线路，然后使用扩展Ward等值对外网进行化简。在现有方法提供的等值网络阻抗和功率的基础上，提出了等值线路、发电和负荷的容量设置、故障设置的方法。对比了直流线路的交流等效阻抗法和等效负荷法的误差。利用IEEE118系统验证了所提方法对连锁故障分析的有效性。
英文摘要：
In order to power grid is studied. improve the efficiency of the cascading failure analysis, static equivalence method of AC/DC First of all, the DC line is converted to AC parameters, then the extended ward equivalent method is used to reduce external grid. Based on the equivalent impedance and power provided by existing equiva- lent methods, the capacity and failure rate of equivalent devices are given in this paper. The AC equivalent imped- ance method and the equivalent load method, which are used to deal with the HVDC, are compared. And the pro- posed method was validated by IEEE 118 system for the effectiveness of cascading failure analysis.
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