Zero sequence method for energy recovery from a variable-speed wind turbine generator

An innovative power conversion system to convert energy from a variable-fre quency wind-powered induction generator to a fixed frequency output. A stan dard six-switch de link Current Regulated Pulse Width Modulated (CRPWM) inv erter is simultaneously modulated with two current components. A three-phas e balanced current component at the induction generator's optimum operating frequency transfers energy from the generator to the converter. A single p hase zero sequence current component at a fixed 60 Hz frequency transfers e nergy from the converter through a zero sequence filter to the load. Unity power factor output is shown both in simulation and experiment, though any arbitrary power factor output may be readily commanded. Maximum power captu re for a variable-speed wind turbine is achieved using proven control techn iques. This method uses only half of the active power switching devices of conventional conversion methods. Simulation and experimental verification a re shown.