Proposing a power management method for more exploitation of a stand-alone DFIG-based wind turbine

In this paper, a power management method for appropriate performance and more exploitation of a wind turbine in stand-alone mode has been proposed and simulated. The structure is composed of a wind turbine based on a doubly fed induction generator, which is assumed without the presence of energy storage systems (ESS) and other distributed generators (DGs). In this paper, the stand-alone structure is considered to operate in real conditions, and the real wind profile has been applied. The challenge ahead in this situation, is inequality between the mechanical power received from the wind, and the demanded power of local load. Regulation of the voltage and frequency is also the responsibility of DFIG. The proposed power management method operates considering the amount of kinetic energy stored in the turbine inertia, so that more exploitation of wind turbine is possible under these conditions. This power management method has not been studied in the references yet. In this method, when the received power from the wind is more than the load power, the controlling method based on the pitch angle control, operates in a way that the most possible kinetic energy may be stored in the inertia of the turbine, thus the local load is fed for longer time. If the load power is greater than the received power from the wind, the unnecessary loads elimination method is suggested. The proposed method by matlab/simulink is simulated and its results are analyzed at the end. According to the results, it can be concluded that the stability of the turbine in stand-alone mode is increased and the local load is fed at a fixed voltage and fixed frequency, based on the proposed power management method.