针对风力发电中变速恒频难的问题，提出一种基于混合式液压机械复合无级变 速器( HMCVT) 的系统设计方案，通过功率分流的方式将液压的高功率密度、无级变速的 特点与机械的高效率特性结合并互补． 首先以变速输入、恒速输出为前提，理论分析了液 压机械变速器式风力发电系统的调速特性和效率特性;然后，结合实际工况，利用 Matlab/ Simulink 软件对该系统进行数学建模和动态仿真分析，通过模糊 PID 控制器实现了对输 出转速的快速精确控制;最后，利用搭建的变速器综合测试平台对样机的调速特性进行了 测试． 研究结果表明:液压机械复合变速器用于风力发电系统，能在额定切入、切出风速范 围内很好的解决变速恒频问题，且动态性能良好，效率较高，稳定在87%左右． 

A wind power generation system design based on power-split type Hydro-mechanical continuously variable transmission ( HMCVT) was proposed，aiming at the problem of variable speed constant frequency ( VSCF) in wind power generation system． The system combines high-power density and stepless speed regulation in hydraulic circuit and high efficiency in mechanical circuit by means of power-split． Firstly，the static speed regulation and efficiency characteristics were analyzed theoretically on the premise of variable speed input and constant speed output． Secondly，modeling，dynamic simulation and analysis were carried out for the HMCVT wind power system by Matlab/Simulink，combining with the practical working conditions． Additionally，the controller based on fuzzy PID was established，which enabled it to control the output speed rapidly and accurately． Finally，the speed regulation characteristics of the transmission prototype was investigated on the comprehensive test platform． The simulation and experimental results show that the HMCVT technology provides a solution to VSCF problem for wind power generation system between the wind speed range of cut-in and cut-out． Moreover，it has swift dynamic property with the efficiency around 87%．