The Applied Research On Prime Mover And Governor Modeling Of The Yunnan Power Grid Stability Study

The power system operate safely and steadily is base on the steady analyses of power system. Between the4main models of power system, the study of prime mover and governor models are not taken seriously in the past. With the development of Yunnan Power Grid, the dynamic stability is more and more prominent. Now the modeling of prime mover and governor has become an important issue in Yunnan Power Grid. There are some differences between the traditional prime mover and governor model and the PSD-BP A model so that the model fitting should be taken.The focal point of this article is the method of establishing the prime mover and governor model for stability calculation.There are main achievements as follows:1、In engineering practice, the Primary Frequency Test and Parameter Identification Test are so important that every power station should do the test before connecting power system The curve fitting must be taken to get the specific parameters which is required by the modeling of the prime mover and governor because of various types of turbine group. Most measured parameters is consistent to the parameters of the ideal models provided by equipment manufacturers or the typical parameters of classical models. But there are still some errors between them.2. The time-domain analysis and frequency-domain analysis are respectly done to the IEEE9system and Yunnan Power Grid system. In time-domain analysis, the conclusion that the prime mover and governor model will increase the damp of system is verified through the Prony analysis of electromagnetic power curve and power angle curve. In frequency-domain analysis, It is indicated that the oscillation modes and damp in the low frequency oscillation damping is affected by the prime mover and governor model. Specificly, when prime mover and governor model is considered, the oscillation modes of system would decrease and the damp of system would increase.