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Control and Interfacing of a Grid-Connected Small-Scale Wind Turbine Generator

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4 Author(s)
Haining Wang ; Sch. of Electr. Eng. & Autom., Hefei Univ. of Technol., Hefei, China ; Nayar, C. ; Jianhui Su ; Ming Ding

An ac/dc/ac power converter is an important device used to extract power from variable speed permanent magnet wind generators and feed it into the grid. This paper describes how these converters incorporate maximum power point tracking based on its power feed to the grid at different wind speeds. Using the permanent magnet generator voltage, grid current, and grid voltage samples, the proposed system achieves an enhanced dynamic behavior. This feature effectively prevents the grid from “boost” charging the dc side of the H-bridge inverter at the start of operation. Since small wind turbines normally do not have expensive pitch control mechanisms, a thyristor-based “dump-load circuit” is employed to protect the turbine from high wind speed operation when disconnected from the grid. The thyristor controller also protects the inverter from high dc voltage input from the wind generator at high wind speed. Preliminary results are included using a laboratory 2-kW prototype converter.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:26 ,  Issue: 2 )