Crowbar protection-based control strategy for low voltage ride-through of DFIG

摘要

With the large wind turbines in power grid permeability rise ceaselessly.Power system due to grid failure resulting in voltage dips uninterrupted operation capability (low voltage ride through capability) a higher demand.In this paper,in order to achieve the double fed wind turbine LVRT,proposed one kind based on the crowbar protection and the active and reactive power coordinated low voltage ride-through control strategy.The paper analyzes the principle of doubly fed induction generator (DFIG)for wind turbines,builds dynamic mathematic model of DFIG including converter,and constructs module of grid-connected DFIG for wind power by DIgSILENT /Power Factory.Based on simulation experiments,this paper analyzes the low voltage ride through (LVRT) capability of DFIG for wind turbines in external power network fault,the result of simulation and actual test results were compared,verifying the effectiveness of this control strategy to achieve low voltage ride through capabilities.