Global Control of Power System for Transient Stability Enhancement and Voltage Regulation

Global control is extended to uncertain power systems to maintain the transient stability and achieve proper post-fault voltage. The power system is first decomposed into several partial models according to different control objectives and operating stages. Then the direct feedback linearization (DFL) technique is applied to linearize the partial nonlinear models and robust partial controllers are designed to consider the system uncertainties and controller interactions for different partial models. Only local variables are needed in the design of partial controllers. Finally, the global control law is obtained by aggregating the partial controllers with membership functions. The single-machine infinite-bus (SMIB) power system with the SVC is used as an example system to evaluate the effectiveness of the proposed global control approach.