Control Algorithm for Energy Storage Integration with an Open-Winding Wind Turbine Generator

A power electronic converter topology and control strategy is presented which allows battery energy storage to be integrated into a wind turbine. The topology leverages an open-end-winding permanent magnet synchronous generator controlled by a dual two-level voltage source converter. The additional degrees of freedom inherent to the proposed system allow for simultaneous control of wind turbine speed and the power flow to the grid. These control objectives are achieved by a power sharing algorithm which distributes the voltage vectors of the two converters in order to achieve desired power flow. An active front end power converter with LCL filter is used to connect the wind turbine and battery to a three-phase electrical grid. Simulation results show the efficacy of the proposed system in regulating the power flow to the grid while simultaneously ensuring wind turbine speed control is achieved.