针对负荷动态特性激发电压的动态变化而且在极端情况下可能导致电压崩溃的问题,将转差率引入负荷等效阻抗模型对负荷的阻抗模及阻抗角进行了分析,得出了负荷的阻抗模及阻抗角的突变点；基于该模型对负荷动态特性进行了分析,讨论了负荷变化时节点的电压及功率变化情况,得出了节点电压转折点和节点功率转折点；结合三元电压稳定分析法推导出的传输网络的电压稳定极限曲线,利用算例分析了不同的负荷比例对电力系统静态电压稳定性的影响,从而得出了恒阻抗负荷比例的增加有利于增强电力系统静态电压稳定性的结论.%In view of problems that load dynamic characteristics excited dynamic change of voltage and would cause voltage collapse under extreme case, the paper introduced slip ratio into load equivalent impedance model to analyze load impedance module and load impedance angle, which obtained catastrophe point of load impedance module and load impedance angle. It analyzed load dynamic characteristics by use of the model and discussed changes of voltage and power of node when load changed, which obtained turning points of node voltage and node power. It analyzed influence of different load proportion on static voltage stability of power system by an example through combining with voltage stability limit curve of transmission network which was deduced by three element voltage stability analysis method, so as to reach a conclusion that increasing proportion of constant impedance load would be helpful to enhance static voltage stability of power system.
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