Abstract
The effective control of permanent magnet synchronous generator(PMSG) based wind energy conversion systems(WECS) under unbalanced grid voltages is important to improve the grid-connected operation ability. This paper applies the proportion integral plus reduced order resonant integrator(PI-ROGI) controller to the PMSG grid-side converter, which can achieve zero current error control in the positive synchronous rotating reference frame without any decomposition of positive and negative-sequence currents. The double supply frequency oscillations of DC-link voltage and the output active power caused by the lose control of negative-sequence current can be well restrained. A PI-ROGI based control scheme implemented in the positive synchronous rotating reference is designed. Furthermore, the simulation results using Matlab/simulink demonstrate the effectiveness of the proposed control scheme on improving the operational performance of PMSG under asymmetrical grid faults.
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