基于异步电动机的风力机风轮动态模拟方法

为提高风力发电机系统的控制性能，设计了一套风力机风轮的动态模拟装置，该装置具有与实际风力机风轮相同的机械特性，可用于设计、评价和测试实际的风力发电系统．假设负载在单位采样时间内恒定，模拟控制器根据电机反馈速度估算出每个采样时刻的负载值，由风力机风轮的特性计算出实际风轮的输出加速度，再与计算出的风轮加速度相比较，算出异步电动机的电磁转矩指令，采用直接转矩控制策略控制变频器，以调节异步电动机的电磁转矩．仿真结果表明，用该方法估算的负载值与实际负载相差很小，模拟系统的机械动态特性与实际风力机风轮的基本一致．

Dynamic Simulation Method for Wind Turbine Based on Induction Motor

In order to improve the controlling performance of wind-energy conversion systems, a dynamic wind turbine simulator with the same mechanical characteristics as those of the actual wind turbines is put forward to design, evaluate and test actual wind turbine systems. When the load in a sampling period is constant, the simulator can evaluate the load at each sampling time according to the feedback speed of the induction motor, calculate the output acceleration of a real turbine according to the characteristics of wind turbines, and obtain the magnetic torque instruction of the induction motor by the comparison with the calculated acceleration value, while the magnetic torque of the induction motor can be regulated by the direct torque control (DTC) for the transducer. The simulated results indicate that the evaluated loads accord well with the actual ones, and that the dynamic characteristics of the proposed simulator are similar to those of the actual wind turbines.