A multiphase PM synchronous generator wind turbine control for internal medium voltage DC distribution system

The paper presents an original direct-drive wind turbine control algorithm for a twelve-phase permanent magnet synchronous generator. The electrical machine is characterized by four independent three-phase star subsystems with isolated neutral point. Variable speed wind turbine control is achieved through a master control algorithm which synthesizes the setpoint in order to improve the reliability and to carry out the overall wind farm energy distribution management. These goals are achieved by means of the decoupled control of each three phase sub-systems in which the generator is split and by the the use of a master control algorithm which allows the management of the reference currents of each sub-system converter. The DC sub-system converters power outputs are directly connected to an internal wind farm Continuous Medium Voltage Distribution (CMVD) system in order to feed a centralized cascaded H-Bridges inverter used as the only interface between the electrical network and the wind farm. The preliminary design of PM generator and the synthesis of proposed master control algorithm are reported. The simulation results are presented to highlight the goodness of the proposed scheme.