Minimization of powers ripple of direct power controlled DFIG by fuzzy controller and improved discrete space vector modulation

This paper presents a new direct power control (DPC) strategy for a double fed induction generator (DFIG) based wind energy generation system. The strategy of the discrete space vector modulation (DSVM) that is on the basis of the DPC, is implemented. The algorithm to select voltage vector can effectively change the response of the system. So, a new analysis is done and a new switching table is proposed. The proposed switching table is presented to optimize the performance of the voltage vectors by accurately designing the sequence of the voltage vectors. Rearranging the sequence of the voltage space vectors has an influence on active power ripple. To enhance the performance of the closed loop system, fuzzy system is proposed in place of the switching table and hysteresis system. The four variables, rotor speed, errors of the active and reactive powers and stator flux position are exerted to the fuzzy system and the output is the vector that should be implemented to the switching devices. The outperformance of the proposed method is demonstrated by performing simulations in Matlab Software.

► Fuzzy DSVM-direct power control of DFIG is presented in this paper.
► DSVM principle is analyzed and a new method to improve the switching table is proposed.
► The new method is employed to optimize the sequence of the voltage vectors.
► Fuzzy system is designed based on the proposed improved switching table.
► Simulation results show the efficacy of the proposed fuzzy controller to reduce power ripples.