Study On The Influence To Dynamic Simulation Of Power System Model Parameter

Models of power system are very important for power system analysis, and it is also the basic of power system strategy developing, program designing, attemper operating and experiment researching. Fujian electric power company have a research on modeling of it's main generator excitation and governing system. The paper puts forward a method of analyzing and computing the excitation system parameters' effects on dynamic simulation, and the method can be used to verify the parameters of the model. The study of this paper is the important component of the excition system modeling research. The paper designs MATALAB program. The nonlinear differential equation which models generator, excitation system and governing system is established to make power system with network differential equation. Firstly, the flow equation is establish according to the structure and parameters of power system, the model and parameters of generator and its excition governing system. Secondly, the PQ decomposition method is used to calculate the power flow. Thirdly, the initial values of state variable are calculated on the basis of power flow. To obtain state matrix A of linear differential algebra equation, the equation set of the model, then the eigenvalue of state matrix A and its effection on sensitivity of excition system are calculated by QR method. The method proposed in the paper is used to analyze IEEE 9-node system and FuJian power system and acquire eigenvalue's sensitivity of generator excition system. The validity of this method is verified by simulation in BPA program.