Decentralized sliding mode stabilizer design for multi-area interconnected power systems

This paper proposes a robust control strategy to study the decentralized load-frequency control problem of multi-area interconnected power systems with parameter uncertainties using sliding mode control. It comprises N local robust load-frequency controllers for an N-area power system. The bounds of system parameter uncertainties are also considered for robustness. A method of eliminating the chattering encountered in load-frequency controllers combining the sliding mode control technique is presented. Overall system stability, for all admissible system parameter uncertainties and the generation-rate constraint, is ensured when the robust load-frequency controller and sliding mode controller are in operation. The effectiveness of the proposed robust control scheme has been verified through simulation studies on a three-area interconnected power system model.