中文摘要：

提出了液压型风力发电机组定量泵双并联变量马达主传动系统并网的控制方法，即当首台变量马达处于并网状态时采用恒压控制方法实现下一台变量马达启动时系统不失稳，并采用结构不变性原理对双并联变量马达速度耦合进行解耦，当下一台变量马达启动后采用转速控制方法实现并网同步转速控制；建立了系统并网控制的数学模型，并进行了仿真研究，得到了不同风速（定量泵转速）条件下系统采用压力与转速控制的并网过程中定量泵转速、变量马达斜盘摆角、变量马达转速、系统高压压力的响应特性，验证了定量泵双并联变量马达系统并网控制方法的有效性，为拓展液压型风力发电机组在大型及超大型机型中的应用奠定了理论基础。

英文摘要：

A grid connected control method was presented herein,which was used in the main transmission system of the fixed displacement pump-double parallel variable motor in hydraulic wind turbine,namely when the first variable motor worked in the state of grid connected,another variable motor didn’t lose stability in startup under the constant pressure control method.The rotate speed coupling of the double parallel variable motor was eliminated with the principle of structure invari-ance,therefore,when another variable motor was post-launch,the grid connected synchronous rotate speed was controlled under the speed control method.Meanwhile,the grid connected control mathe-matical model was established,and simulation was conducted.With pressure and speed control,the fixed displacement pump rotate speed,the variable motor swashplate angle,the variable motor rotate speed and the system high pressure response characteristics in the process of grid connected were ob-tained under the condition of different wind speed （fixed-displacement pump rotate speed）.The grid connected control method was verified in the fixed displacement pump-double parallel variable motor. This reserach lays a theoretical foundation to expand the hydraulic wind turbine in the applications of large and super large wind turbine.