Adaptive hybrid control of a dynamic voltage restorer in compensating sag/swell and harmonics using a new indirect fuzzy type-2 approach

摘要

A new hybrid adaptive voltage controller to regulate the output voltage of the DVR is proposed in this paper. The first part of the proposed scheme utilizes the type-2 fuzzy logic principles and lyapunov's terms to estimate and overcome the nonlinearities, uncertainties and perturbations and to shapes the system dynamics properly. To minimize the calculation cost, forced to the system by the adaptive type-2 fuzzy logic control (AT2FLC) scheme, the fuzzy scheme is switched with the second proposed controller in small errors. The second part is a hybrid controller itself. It combines the conventional linear and sliding mode control (SMC) principles to obtain a simple and robust controller. Hence, the advantages of both schemes such as soft operation of linear controllers and robustness of SMC scheme are preserved. Simulations were performed in MATLAB/SIMULINK environment; confirm the applicability of the proposed hybrid adaptive type-2 fuzzy logic control (HAT2FLC) in compensating all types of network faults.