液压型风力发电机低风速下的恒转速控制方法

Constant Rotation Speed Control Method of Hydraulic Wind Power Generator Under Low Wind Speed

为实现液压型风力发电机在低风速下的恒转速控制,以大功率的低速大扭矩径向柱塞泵代替传统的定量泵,分析风力发电机在低风速下的性能。基于液压型风力发电机组的工作原理,建立定量泵-变量马达主传动系统数学模型,采用PID算法闭环调速控制的方法实现变量马达恒转速输出。仿真实验结果表明,在低转速下定量泵的负载和输入转速变化,对变量马达恒定输出转速的影响不明显。在定量泵转速输入出现波动和负载发生变化的情况下,采用PID算法闭环调速控制的方法,能够实现变量马达在低风速下的恒转速输出。

In order to realize the constant speed control of hydraulic wind turbines at low wind speeds,a high-power,low-speed and high-torque radial piston pump is used to replace the traditional quantitative pumps,and the performance of the wind turbines at low wind speeds is analyzed. Based on the working principle of the hydraulic wind turbine,the mathematical model of the main drive system of the fixed displacement pump-variable displacement motor is established,and the PID algorithm closed-loop speed control method is adopted to realize the constant speed output of the variable displacement motor. The simulation experiment results show that the change of load and input speed of the fixed displacement pump at low speed have no obvious influence on the constant output speed of the variable displacement motor. In the case of fluctuations in the input of the fixed displacement pump speed and changes in the load,the PID algorithm closed-loop speed control method can be used to realize the constant speed output of the variable displacement motor at low wind speeds.