Power coordinated control of wind turbines with permanent magnet synchronous generator for low voltage ride through

Abstract

A power coordinated control method is proposed in this paper. It is used to improve the low voltage ride through (LVRT) capability of wind turbines with permanent magnet synchronous generator (PMSG). Firstly, the factors that influence the LVRT of PMSG are analyzed in details. A coordinated application strategy of these factors is presented. Secondly, an improved power coordinated control method is proposed based on the theory analysis. The active power on the grid side is controlled to track the maximum wind energy. The active power output of the generator maintains the DC link voltage constant. Current limitation links are added to the converters. And the mode of pitch angle control is also modified. The LVRT burden of PMSG can be reduced by the pitch system in the whole wind speed range. Thirdly, the practicability and effectiveness of the proposed method is verified by the simulation in DIgSILENT/Power Factory.