1results about How to "Improve on-grid performance" patented technology

The application provides a kind of permanent magnet direct drive wind turbine multi-objective control method under power grid asymmetrical fault, solve the technical problem of power fluctuation suppression and current unbalance degree reduction control target coordination optimization in fault ride-through. Including the following steps: S1: establish the positive and negative sequence coordinate system model of permanent magnet direct drive wind turbine grid-side converter, separate the positive and negative sequence of grid-side converter voltage and current;S2: calculate the grid-side converter reference current instruction of three control targets;S3: construct the unified expression form of grid-side converter reference current;S4: select active power fluctuation suppression and negative sequence current suppression as the coordinated optimization control target for control;S5: construct multi-objective optimization function, obtain the converter current reference value, and carry out current closed-loop control on grid-side converter. The beneficial effects of the application are: the multi-objective coordinated optimization control of permanent magnet direct drive wind turbine under power grid voltage fault is realized, and the low voltage ride-through capability and grid-connected performance are enhanced.