Nonlinear stabiliser design applied to microalternator system

A method for designing stabilisers for high-speed static exciters which includes the systems nonlinearities and allows for nonlinearities in the stabilisers is presented. The method combines the use of nonlinear-optimal-control techniques and system-identification techniques to design flexibly structured stabilisers based on readily available outputs of the system. The method also allows the combination of information from many operating conditions in the design process. The performance of the method is first examined on a computer simulation of a single- machine/infinite-bus system. Then the method is tested on a microalternator system to verify the computer results and to demonstrate the practical feasibility of the design method. The results show that the stabiliser performs very well both for small changes in the reference inputs and large disturbance faults applied to the system.