Research For Nonlinear H_∞ Excitation Controller Of Synchronous Generator

The excitation of synchronous generator plays an important role in power system. A good design excitation can maintain voltage effectively, and improve the stability of system. Compare excitation is more to other measure focus on improve stability of power system, inexpensive and more easily to carry out.In this paper, after entirely introduction of the development of generator excitation control theory and compare of all kinds of excitation control method, the nonlinear excitation control theory with using the method of direct feedback linearization and nonlinear H_∞control theories are presented and its shortage of lack of precision of voltage regulation is indicated., and the two theories are discussed in detail. The control algorithm is simple and practicable.The mathe analysis of synchronous generator is given, and give out the state equation of synchronous generator of ship power station. Based on direct feedback linearization and the nonlinear H_∞control theories, the nonlinear excitation controller model is established. The optimization of weight function is implemented byμ-analysis and synthesis toolbox in MATLAB and the design of non-linear robust control is performed.The simulations and analysis are describe for the former nonlinear H_∞controller and it compared with the conventional PI controller. Results show that, compared with the conventional PI controller, it can improve not only the voltage characteristic, but also the steady state stability and transient stability of power system. The simulation results of the control system are satisfactory.At last, in this paper, the program design for the former nonlinear H_∞controller with DSP are given. It introduces hardware component and software design.