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Implementation and control of grid connected AC-DC-AC power converter for variable speed wind energy conversion system

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3 Author(s)
Seung-Ho Song ; Div. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeon-Ju, South Korea ; Shin-il Kang ; Nyeon-kun Hahm

30 kW electrical power conversion system is developed for a variable speed wind turbine system. In the wind energy conversion system (WECS) a synchronous generator converts the mechanical energy into electrical energy. As the voltage and frequency of generator output vary along the wind speed change, a DC-DC boosting chopper is utilized to maintain constant DC link voltage. The input DC current is regulated to follow the optimized current reference for maximum power point operation of turbine system. Line side PWM inverter supply currents into the utility line by regulating the DC link voltage. The active power is controlled by q-axis current whereas the reactive power can be controlled by d-axis current. The phase angle of utility voltage is detected using software PLL (phased locked loop) in d-q synchronous reference frame. Proposed scheme gives a low cost and high quality power conversion solution for variable speed WECS.

Published in:

Applied Power Electronics Conference and Exposition, 2003. APEC '03. Eighteenth Annual IEEE  (Volume:1 )

Date of Conference:

9-13 Feb. 2003