负荷模型对孤立城市电网自然频率特性的影响研究

he islanding operation of the urban power grid is an important measure to improve the reliability of power supply and its self-healing capabilities, while it is weak to withstand disturbance, and the stability of system frequency is poor. Based on analyzing the characteristics of loads in city, the static and dynamic model of a single load are built, and a comprehensive load model of the loads on the same bus and a generalized load model considering the influence of distributed generation is established respectively. In the circumstances that generators are not used to control, by the simulation of frequency change process of the urban power grid after the disturbance occurred under different load models, the natural frequency characteristics of the urban power grid are found. The results show that different load models on the impact of the frequency of the urban power grid is different, the frequency characteristic derived from static load models is too conservative, the integration of distributed generation will make the natural frequency characteristic of the urban power grid deterioration.