A novel robust adaptive control of parallel energy resources in smart island

Abstract

This study suggests a robust indirect adaptive sliding mode controller to control renewable energy resources (RERs) in the smart island with an uncertain resistive load. State observers are used to design adaptation laws. The paper analyzes a case study where the suggested scheme is applied to a smart island in which three RERs are operated in parallel. RERs in voltage controller mode are responsible of voltage and frequency control while the RERs in current controller mode have duty of load sharing. To make the case study as realistic as possible, various types of loads including linear and non-linear ones are considered in the analysis. The extensive simulation results show that the proposed controller can provide more eligible total harmonic distortion (THD), a smaller steady-state error and a fast repercussion under various types of load. Furthermore, the proposed algorithm offers easy implementation as well as high robustness against system uncertainties and sudden variations in load. The experimental results of the tests carried out in the laboratory using DSP validate the effectiveness of the method. The performance of the proposed controller is contrasted with that of the non-adaptive and classic voltage controller through simulations carried out in MATLAB environment under parameter uncertainties.