Research and Implementation of Electromechanical Transient Model in Electromagnetic Transient Program

With the wide application of power electronic technologies in power system, such as HVDC, new energy power stations and FACTS, the dynamic characteristics of the interconnected power grid have changed dramatically, and the traditional quasi steady model based electromechanical transient program cannot simulate the fast switching process of the power electronic components and its non-fundamental frequency or asymmetry characteristic, which is important to the accuracy of HVDC and FACTS models. Because of the limitation of calculation load and computing speed, traditional electromagnetic transient program cannot replace electromechanical transient program in large-scale power system stability analysis. FEMTP should be redesigned for transient stability analysis of large-scale electronic power system. Then the generator and transmission line's electromagnetic models are discussed in this paper, and the discussion and simulation shows the adequation of their electromechanical transient model in FEMTP. Afterwards, the implementation of FEMTP was discussed in detail, and the example of China East power grid shows the appropriation of simplified electromechanical models and proposed technologies.