Improved voltage vector control for a stand-alone DFIG system based on predictive current regulation algorithm

This study proposed an improved voltage vector control strategy based on predictive current control (PCC) for stand-alone doubly fed induction generator (DFIG) systems. The proposed control scheme implements close-loop control of both d-axis and q-axis stator voltage in a synchronously rotating reference frame, which regulates the magnitude and the phase of stator voltage precisely. Compared with previous voltage control schemes, this method provides fast and accurate tracking ability of stator voltage, resulting in excellent steady-state and dynamic performance of the system. Moreover, complex delay time compensation in PCC is no longer needed with the recommended strategy, intensely reducing the calculation burden. Simulation results for a 160kW stand-alone DFIG system are presented to validate the effectiveness of the proposed method.