Transient Stability Research Of Shipping Power System

With the advance of technology, big capacity, high quality and automation are the developmental direction of the ship power system. Compared to land power system, ship power system is a independent power system, which has important effect in ship power system is small but complicated.The research of ship power system has very important significance. The stability of ship power system is one of the basic needs of the power system safety operation. Transient stability of power system is always a subject on which attention has been paid by electrical workers. In the means of improving transient stability in the system, excitation control of generator is one of the most economical and effective measures for the improvement of power system stability. 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. Transient stability of power system can be obviously improved by adding proper control to the generator excitation. In this paper, after entirely introduction of the development of generator excitation control theory and compare of all kinds of excitation control method, the H_∞control theory is presented . The H_∞control theory is a kind of powerful tool of analyzing and designing uncertain system, which can solve mainly control problems of control quality worsening due to the error of object modeling and model perturbation within a certain range. This paper makes researches on the application of the H_∞control theory in ship power system.Through detailed analysis and research group in transient diesel generators in the process of mathematical models, the optimization design are given. The simulations and analysis are described for the H_∞controller and it compared with the conventional Pl controller. Results show that, compared with the conventional Pl controller, it can improve not only the voltage characteristic, but also the transient stability of power system. The simulation results of the control system are satisfactory.