Improvement of Transient Stability of AC-DC Power System Using RPSO Based Sliding Mode Controller

The research is attractive in application of robust controller in VSC-HVDC-based power system due to strong nonlinearity, coupling, and multi-input multi-output (MIMO) system. The power system is highly nonlinear and complex in nature. Thus, stability is a major issue in the interconnected power system. Many robust controller techniques have been applied to solve the stability issues. In the majority of the controller plan, the determination of gains likewise influences the strength and productivity of the controller. The determination of legitimate gain is profoundly entangled in a multi-machine power control system. Here, a four-machine two-area power system interconnected with VSC-HVDC system is taken for study. As a matter of first importance, proportional integral (PI) controller is applied toward enhancement of the stability. The same system is put under sliding mode controller with same working condition. Further, another particle swarm optimization method, known as Regularized particle swarm optimization (RPSO), is applied to locate the best estimations of gains of the sliding mode controller, and the model is simulated in MATLAB/SIMULINK programming. It is seen that the RPSO-HVDC performs superior to SMC and PI controller.