Study On Excitation Control Of Power System

With the rapid development of the power system, large units, ultrahigh pressureand regional Internet have become the main features of the power system. At the sametime, the power system has become a complex nonlinear system of huge dimensionsand strong couplings. At present, the operation of this system is close to its limits,which makes the power system’s transient stability control become the a main issue.General controlling technologies can’t adapt to the development of the power systemany more in practical application for that it can’t solve the controlling problems of thepower system. Therefore, the uses of new technologies play a great role in solving theproblems of large-scale power system’s transient stability control.According to the characteristics of the power system, the synchronous generator,as the central part of the system, has been analyzed in this thesis. The parameters usedin practical engineering are introduced into the typical Parker (Park) equation to builda practical model of the power system. The synchronous generator is analyzed inmathematics. By using the fuzzy control theory, a fuzzy PID controller of excitationsystem design. By determining the fuzzy control input basic domain, calculate thequantized factor and proportional factor, establish the membership function of input,with the center of gravity method for solving fuzzy, and the simulation is carried outon the system. When the control system is robust to the stronger, a robust controller forexcitation system design. In order to Park equation as the foundation, has constructedthree order model of power system. At last, a simple linear model of the power systemhas been derived. Then, through a combination ofH_∞Robust control theory, at thebasis of the derived linear model and the introduction of disturbance,H_∞Robustexcitation controller in disturbance has been designed, which convert the controlproblem into a convex matrix inequalities. Trough using the MATLAB simulationsoftware to modeling the above controller, control parameters and minimumperformance can be obtained. The simulation results show that: the robust excitationcontroller based on a linear model can achieve the desired results, and effectivelyimprove the power system’s transient stability.