Embedded Wind Turbine Generation into AC Weak Distribution Grids

A specific wind turbine (WT) generation scheme is used and a control strategy is studied, not only to increase the efficiency of the WT but also to limit the influence on the alternating current (AC) distribution grid. The system is a variable-speed wind-energy conversion scheme, including a synchronous generator with two three-phase stator windings displaced by 30°, which are connected to the AC distribution grid through DC links with Voltage Source Inverters (VSI). A state feedback controller has been designed, using the pole placement technique, to maximize the wind-energy capture. The controller of the DC link secures a smooth supply of the WT electric power to the distribution AC grid by supporting the output voltage and reducing the harmonic distortion. The operation of the proposed system and the efficiency of the control strategy are demonstrated and tested using simulation techniques.

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