Research On Transient Characteristics Of Power System Connected Distributed Generation

With the development of distributed generation, there have been a great number of distributed resources. Which are becoming more and more important to power system in distribution system. Studying the influence of distributed resources to transient performance of power system is becoming a desiderated solving technique issue. Dynamic model of gas turbine considering speed governor and excitation system is presented in this paper, and dynamic model of fuel-cells considering loops of active power, reactive power controller and fuel flow regulator is also presented. The User- Defined Model of excitation system and governor is established using PSASP/UD. Combined with typical distribution system, this paper analyses the dynamic performance of governor and excitation system and the effects of considered different changing capacity of gas turbine on the transient performance of distribution system. With model of gas turbine and fuel-cells established in MATLAB, the dynamic performance of grid-connected gas turbine are the effects of changed capacity of fuel-cells is analyzed,and the different capacity mixing about fuel-cells and gas turbines on dynamic performance of distribution system are analyzed. The cases have shown the feasibility and the validity of the model, and this paper has established the foundation for further studying on the influences of distributed generation to power system.Shen Haiquan (Electric System and Its Automation)Directed by Prof. Li Gengyin...