区域小水电机群动态等值建模方法研究

在对含小水电机群的电网进行分析时，若要研究小水电机群整体的动态特性，采用包含每台小水电机组模型的详细模型并不方便。实用的方法是先对小水电机群进行等值建模，再在等值模型的基础上进行各种分析。提出了一种区域小水电机群动态等值建模方法，该方法以同调等值为基础，对参数聚合、网络化简等环节加以改进，可以快速得到区域小水电机群的动态等值模型。基于该方法对IEEE 10机39节点系统和湖北恩施地区小水电机群进行动态等值建模，仿真结果证明了所提等值建模方法的有效性。在此基础上，通过进一步仿真分析了等值负荷对于动态特性的影响，为区域发电机群在线动态等值建模奠定了基础。

A dynamic equivalent modeling for regional small hydropower generator group

When analyzing the stability of power system, it is not convenient for the analyst to know the dynamic performance of the generating units group as a whole if a detailed model is used. It could be much more convenient if a dynamic equivalent model is used instead. This paper presents a method to build a dynamic equivalent model of small hydropower generating units. Some procedures, such as aggregation of the parameters of the generators and the abbreviation model of the network, are improved to make it more applicable to build the equivalent model. For validation purposes, the proposed method is applied to a test IEEE system of 10 generators and 39 buses and the small hydropower generating units in Enshi, Hubei province. Results show that the reduced system retains the dynamic performance of the original system with good accuracy. Further simulations are made to analyze the effect of the equivalent load model, which lays a foundation for dynamic equivalent modeling.