Abstract
The nonlinearities and parameter uncertainties of a power system and the system behaviour following a severe disturbance preclude the use of linear control techniques. In this paper, a robust controller for transient stability enhancement is developed using a global control approach. The nonlinear power system model is first linearized over the whole operating region by using the direct feedback linearization (DFL) technique. After linearization, the system model can be treated as a linear system with large parameter uncertainties. Robust controllers are designed for different operating regions. Finally, in order to construct a global control system, the fuzzy (or heterogeneous) control technique is used to integrate the local controllers together. The single-machine infinite bus power system is used as an example system to evaluate the effectiveness of the proposed controller. Simulation results demonstrate that the proposed global control system can provide superior performance in power system transient stability enhancement.
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