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Abstract: To realize variable-speed-constant-frequency (VSCF) output power of wind energy conversion system (WECS) and to lower the cost of frequency-conversion system, a novel approach of flexible hybrid-driven unit for wind energy conversion system is presented. The realizing theory of this approach and the fundamental structure of the hybrid-driving differential transmission are described. Three axes rotor speed relationship is analyzed from kinematical point of view. The calculation formula of the key parameters of the controllable servomotor as timing amplifier, timing depth, and timing bandwidth are given. With sample parameter data, the characteristic parameters of this VSCF transmission of WECS under the rated speed are calculated. The results show that, with the steady output of wind power, this system can realize maximum power point tracking (MPPT).
Key words: Variable-speed-constant-frequency Wind energy conversion system Power splitting Planetary gears
CLC No:
TM315
国家自然科学基金(50575180)、陕西省教育厅科学研究基金(22051)和西安理工大学创新基金(210401)资助项目.
Received
20070209,
received
in
revised
form
20070718
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