COMPARATIVE STUDY OF TWO ROBUST CONTROL STRATEGIES APPLIED ON A WIND CONVERSION SYSTEM BASED ON A HYBRID EXCITATION SYNCHRONOUS GENERATOR

This paper deals with a Wind Conversion System (WCS) based on a Hybrid Excitation Synchronous Generator (HESG) connected to an isolated load. The set is modeled under Matlab-Simulink. To ensure an efficient and reliable use of the system, a tight control remains vital. In fact, the dynamic equations of a turbine are strongly nonlinear as are the ones of a HESG; most of the system parameters are highly uncertain, and, at last, a WCS is always affected by unknown disturbance sources. To address these problems, robust control methods must be adopted. In this paper, two control strategies for the maximization of the wind turbine extracted power are investigated. First, a H∞ controller is implemented. Then, a second-generation CRONE controller is designed. The performance of the two regulators is compared in relation to the tracking of the optimal power outputs and their robustness to the uncertainty of the parameters.