Low voltage ride-through scheme of the PMSG wind power system based on coordinated instantaneous active power control

Abstract

Fast control DC-link voltage is the key to enhance Low-Voltage Ride-Through (LVRT) for the Permanent Magnet Synchronous Generator (PMSG). When grid voltage dips deeply, by the constraint of the capacity of the grid-side converter and reactive power support by the grid-code required, the active power capacity of the grid-side converter will be reduced. Therefore, it cannot stabilize the DC-link voltage relying solely on the grid-side converter. This paper proposes an improved control strategy to combine generator-side and grid-side converter active power. Reactive power support and negative sequence feed-forward compensation are also considered in the paper. The effectiveness of the control strategy is verified by both simulation and the experimental results.