Abstract
The power conditioning system for grid connection of a Permanent Magnet Generator (PMG)-based small wind energy conversion system requires a rectifier, boost converter and a grid-tie inverter. Such system should be based on an appropriate control strategy to control the aerodynamic power during high wind speed, maximum power production, and maximum power flow to the grid at all operating conditions. This paper presents mathematical modeling and control strategy for the grid connected PMG-based small wind energy conversion system. Furling control and expected dynamics are adopted with the wind turbine for aerodynamic power control, while the optimum speed of the wind turbine is followed to ensure the maximum power production. A novel controller is derived from the optimum speed information that promises maximum power flow to the grid by controlling the boost converter output voltage and current through the duty cycle. It is found that the proposed modeling and control strategy is feasible and results are verified through simulation as well as laboratory experimentation.
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