Application of VSC/SMC controllers for automatic generation control in deregulated environment

This paper presents a variable structure/sliding mode controller-based approach to the Load Frequency Control (LFC) problem in interconnected electric power generation systems. This approach combines the salient features of both variable structure and sliding mode control to achieve high-performance and robustness of the LFC. Simulation results indicate that the control scheme is able to substantially enhance control performance in two-area interconnected systems under deregulated operating conditions. Furthermore, it is shown under different case studies that the responses of the system employing the proposed controllers are quite insensitive to parameter changes and speed governor deadband, with or without generation rate constraints. The control strategy requires low computational cost and is amenable for practical implementation.