关键词: 风力发电, 定量泵-并联变量马达, 并网控制, 压力控制, 转速控制

Abstract:

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 invariance,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 mathematical 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 obtained 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.

Key words: wind power generation;fixed displacement pump-parallel variable motor, grid connected control, pressure control, speed control