Wind Power System Control Based on the Self-Synchronized Universal Droop Controller

This paper presents a new control scheme for the back-to-back converter in a wind energy conversion system (WECS) that is equipped with a permanent magnetic synchronous generator (PMSG). The self-synchronized universal droop controller (SUDC) is utilized for both the rotor-side converter (RSC) and the grid-side converter (GSC). The DC-link voltage is regulated by the RSC instead of the GSC. The GSC is responsible for the maximum power point tracking (MPPT) and the grid integration. The control scheme does not involve the commonly-used abc/dq transformation, the phase-locked loop (PLL), or the motor encoder usually used in the field-oriented control to measure the rotor position/angle. The control scheme does not need the generator parameters either, therefore it is simple, and it is robust to system parameters. An experimental platform is built up to test the proposed control scheme and the results have demonstrated the effectiveness and good performance of the control scheme.