Control Strategy for Maximum Power Point Tracking of Doubly Fed Induction Motor for Wind Turbine

Recently, renewable energy resources like wind power have been spread rapidly. Nowadays, wind energy plays an important role in generating green and cheap electrical power. Scientists improve the strategy to optimize the usage of this type of energy by different techniques. A doubly fed induction motor (DFIM) becomes a necessary part of the wind turbine generation system due to its good efficiency of using the wind power and controlling the reactive power. Due to irregular obtainability of the wind, a power system is intended to extract a maximum power from the wind. The purpose of this paper is to introduce a control strategy of a maximum power point tracking (MPPT) for a wind turbine and to study its steady state behavior by using MATLAB/SIMULINK. This modelling algorithm gives the asynchronous machine a possibility to trace and follow the path of maximum power extraction and support the optimal operation points of the power coefficient curve over different wind circumstances, also simulating the wind turbine (WT) model and studying the steady state condition for the reference value and actual value for the rotor speed, electromagnetic torque, the two components of rotor current, rotor voltage, stator voltage and the value of currents for the rotor and stator sides.

I. Introduction

Wind energy generation is increasing rapidly, using different types of wind energy system development techniques, including variable speed wind turbine (VSWT) constant frequency and constant speed wind turbine (CSWT) constant frequency wind energy generation plant with doubly fed induction motor (DFIM), which become typical. The basic advantage of using the DFIM is the management of power by a part of converter power as a small part of the whole wind turbine power priced, thus the power losses, size and manufacturing cost are less than of full-scale power converter [1]. This paper investigates the maximum power point tracking (MPPT) control of DFIM by indirect speed controller (ISC) by considering the electromagnetic torque as a reference shown in Figure 1, where we presented the electromagnetic torque with respect to the maximum power curve and by using the dynamically stability of the variable speed wind turbine for this curve.