Application of Multimode Controlled PWM VVVF Converter in Hybrid Wind Plant for Electricity Generation, Storage and Regeneration

摘要

This paper present the application of multimode soft switch IGBT variable speed converter (VSC) as a power interface in a hybrid wind power generation consisting of wind turbine, induction generators, auxiliary photovoltaic array and ultra-capacitor unit for electricity generation, storage and regeneration. The system uses a doubly fed induction generator for the wind turbine and another generator for the diesel generation unit. The 48Vdc ultra-capacitor/photovoltaic serves as ride –thru utility. The two generators are connected to the grid through power electronic converters and are operated in variable speed mode to maximize the wind energy, as well as balancing the system load demand with less fuel consumption and operate at a 1/3 the power of wind turbine rating. VSC reduces mechanical stress, noise, increases energy production and smooth the fluctuation of power injected into the grid. The unit has four-quadrant capability with an active front end that provides full regeneration to the source, controllable power factor, and flux vector control that allows for instantaneous torque regulation. (VSC) has peak efficiencies of over 96% with total harmonic distortion of less than 4%. The converter works both in grid-tied and stand alone configurations. Math lab is used for the system model simulation.