Predictive controlled SMES for frequency control of hybrid wind-diesel standalone system

Abstract

This paper focuses on frequency control of standalone wind-diesel system using SMES. As the inertia is small, any disturbance in the load will disturb the frequency which will cause electromechanical oscillations. The system frequency which is used to control the SMES unit is estimated by centre of inertia COI technique. SMES being a fast acting storage system can handle the electromechanical oscillations quickly and help in reducing the frequency deviations under limit. In this paper active power control of SMES unit is modulated using an adaptive predictive control scheme. Predictive controller generates reference power for SMES and forces it to follow the power command. Results show that the frequency deviation of the standalone hybrid wind-diesel system is reduced considerably with the proposed predicatively controlled SMES without violating the converter limits.