Abstract
This paper describes the controller design for a DFIG based wind energy generation system using the static output feedback technique through the LMI Toolbox. The features of the DFIG, its converters and their controllers are discussed. The lower order nominal representation of DFIG is obtained using numerical differentiation of the SIMULINK model which is subsequently used for PID controller design. The obtained results are compared with existing methods for performance enhancement of the DFIG and wind energy conversion systems.
Highlights
The investigation of progressively alternate energy sources, demand for electric energy is increasing very fast
This paper presents an experimental study of the doubly fed induction generator (DFIG) with help of seven Proportional Integral (PI) controllers for the internal loops of the DFIG and one PID controller for the supervisory control of the kp 0.0814 ki 4.6647
It is clear from the comparison of the results of the PID control in [8] and the ones reported in this work, that our controller has resulted in suitably damped supervisory control without compromising the speed of response of control loop
Summary
The investigation of progressively alternate energy sources, demand for electric energy is increasing very fast. The DFIG through the use of the two back to back converters, rotor side and grid side converters, is able to deal with a wide variation of wind speeds by injecting a compensating variable frequency current component in the rotor circuit. This facilitates both super and sub synchronous operations of DFIG. The converter has to be intended for the rated power of the turbine This problem can be taken care of by using the DFIG, which has a converter connected to the rotor winding of the wound rotor induction machine (Figure 1(b)). The main components of the wind turbine are given as follows
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