ABSTRACT
With rapid development of modern power system, there become more and more transmission lines with long distance and heavy load, which has a negative influence on damping characteristics. Therefore, the low frequency oscillation happens occasionally, which threaten the system stability and security. In addition to the stability and safety, expected to recover as soon as possible after disturbance frequency, voltage and power balance, that is, the system is expected to have satisfactory dynamic quality. In order to achieve the above goals, better control system is required. Unfortunately, the modern power system is based on a large scale, distributed and highly nonlinear characteristics and complex transient. In view of the characteristics of a traditional controller design based on the linearized model on an operating point, obviously dierent operating conditions change, nonlinear control theory and method of application is likely to improve power system transient stability. Under certain unforeseen large disturbances the performance of linear controllers might not be satisfactory because of the highly nonlinear nature of real power systems. Beside the selection of base operation points and large disturbances is quite empirical. The nonlinear control theory and applications have got a lot of achievements such as the approach based on dierential1geometric theory [1-4]. Recently, Hamilton’s theory of nonlinear control field of electric power system, and many fruitful results have been achieved [5-6].
