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中文摘要：
为了实现风能转换系统（WECS）的变速恒频输出，降低变频逆变器系统造价，提出一种带有柔性混合驱动环节的实现变速恒频风能转换的方法。描述其变速恒频实现原理及差动调速主传动基本结构。从运动学角度分析3个转轴的角速度关系。给出伺服电动机调速幅度、调速深度、调速带等关键参数的计算公式。通过具体参数，计算低于额定风速下该变速恒频风力发电系统的特性参数。结果表明，该系统可以在稳定风能功率输出的同时，实现最大功率点追踪（MPPT）。
英文摘要：
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）.
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A new method for the determination of the zero velocity region of the Karnopp model based on the sta
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