进行与风力机机械液压混合传动相关的基础研究。针对风力机齿轮箱寿命与整机设计寿命落差的"短板问题"，提出通过改善旋转机构运行工况提高传动系统可靠性，实现风电机组全生命周期"深绿化"的学术思想。提出风力机电液控制齿轮箱新概念并研究其原型样机，实现机械齿轮箱传递能量为主、电液系统控制转速为主的新原理传动模式，保证传动系统高效性，抑制扭矩波动，使传动部件使用寿命趋近整机设计寿命。给出了电液控制齿轮箱传动结构例：风轮主轴经两级加速后由差动轮系与泵/马达系统并列，齿轮传动和液压传动功率合流后共同带动发电机发电，减小纯机械传动的力矩波动，弥补纯液压传动效率低的缺点。此传动结构具有保持输出轴转速基本稳定、输入轴可变速的特点，满足现代风力机各种运行工况的需求，可实现高于额定风速时的变桨距与输入功率控制，低于额定风速时的 "变速恒频"控制，提高能量捕获效率和电能品质。通过项目研究可望形成风力机传动的新模式。

The basic research related to the wind turbine mechanical hydraulic hybrid drive is carried out. Aiming at the prominent problem of the gearbox short life compared with the design life, the academic thought of enhancing transmission system reliability by improving the operating conditions of the rotating mechanism to achieve the "deep green" in the whole life of the wind turbine, is proposed. The new concept of electro-hydraulic control gearbox for wind turbine is proposed and a prototype will be studied, in which mechanical gearbox is used for power transmission and electro-hydraulic system is used to control the speed to ensure the efficiency of transmission system and inhibition of the torque fluctuations, and by this concept, the life of transmission parts would be close to the whole design life of the turbine. The electro-hydraulic control gearbox structure is given that the main shaft is accelerated through two-stage gear mechanism, then drive a differential gear train and a pump / motor system simultaneously. The power from the gear transmission and hydraulic transmission is combined to drive a generator, thus reducing the mechanical torque fluctuations and compensating the shortcomings of hydraulic transmission low efficiency .This power train have the advantages of the speed stability of output shaft, variable-speed of the input shaft, which satisfy the different operating conditions of the modern wind turbine. And by the structure, the pitch control, the input power adjust at higher wind speed and VSCF control at the lower wind speed, can be achieved and the turbine power coefficient and power quality can be improved.Through this project, a novel mode of wind turbine power train is expected to form.