Decoupled Control of Doubly Fed Induction Generator by Vector Control for Wind Energy Conversion System

Since the penetration of wind power generation in growing, system operators have an increasing interest in analyzing the impact of wind power on the connected power system. The doubly fed induction generator (DFIG) is generally used in the production of the electric energy and more specifically in wind turbines. Currently, to regulate the active and reactive power exchanged between the machine and the grid. A detail dynamic model of a DFIG-based wind-turbine grid-connected system is presented in the d, q -synchronous reference frame by controlling the machine inverter with the algorithm of control based on vector control concept (with stator flux orientation). The aim of control is to have measured active and reactive powers equal to the reference values. These powers must then be collected. In order to measure only the rotor currents, we can use an indirect control method, with integrating power regulation loop, using a classical PI controller: proportional integral. In this way, this control is able to limit the machine rotor currents. In another way, an appropriate fitness function is derived to express the time domain evolution of DFIG, with the objective to assure the DFIG continuous operation even under a fault condition and improve at the same time its transient behavior as compared with the indirect control without power loop. The control of our machine is simulated; finally the Simulations results are presented and discussed. (C) 2013 The Authors. Published by Elsevier Ltd.