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In order to enhance the low voltage ride-through (LVRT) and grid support capabilities of a multi-pole permanent magnet synchronous generator (PMSG) using full-scale frequency converter, this paper presents a coordinated control strategy for the active and reactive power output of the grid-side converter. When a voltage dip occurs in the grid, the generator-side converter of PMSG is used to rapidly regulate the active power output of the generator to eliminate the unbalanced power in the DC-link side and maintain a stable DC-link voltage, while the grid-side converter of PMSG is employed to realize a coordinated control for active and reactive power output according to the grid voltage change range. The simulation results implemented in Matlab/Simulink show that the proposed control strategy not only realizes the LVRT of PMSG but also provides a dynamic reactive power support to recover the grid voltage.
Date of Conference: 21-24 Oct. 2012