A COMPARATIVE STUDY BETWEEN FIELD ORIENTED CONTROL STRATEGY AND DIRECT POWER CONTROL STRATEGY FOR DFIG

Abstract

This paper presents a comparative study of field oriented control (FOC) and direct power control (DPC) strategies in order to control the active and reactive stator powers of a doubly fed induction generator (DFIG), which is applied to wind energy conversion systems (WECS). Traditionally the FOC is achieved by using of classical Proportional-Integral (PI) controller. However this controller depends highly on parameter variations of the DFIG. The proposed DPC strategy produces a fast and robust power response. Simulation results on a 1.5 MW DFIG system are provided to demonstrate the effectiveness and robustness of the proposed control strategy during variations of active and reactive power, rotor speed, and machine parameters.