Voltage grid support of DFIG wind turbines during grid faults

摘要

The fault ride-through and grid support capabilities of the doubly fed induction generator (DFIG) wind turbines address primarily the design of DFIG wind turbine control with special focus on power converters protection and on voltage control issues. This paper presents the design of a voltage control strategy for DFIG wind turbines, which enhances the fault ride-through capability of DFIG wind turbines and their contribution to support the grid, i.e. to the voltage control in the power system, during grid faults. The performance of the presented DFIG protection and voltage control strategy during grid faults is assessed and discussed by means of simulations of a large DFIG wind farm connected to a power transmission system generic model. The simulation results show how a DFIG wind farm equipped with the presented voltage control can help a nearby active stall wind farm to ride-through a grid fault.