同步风力发电机无刷励磁系统设计

Design for Wind Synchronous Generator Brushless Excitation System

分析了基于可旋转变换器的无刷励磁原理,提出了基于可旋转变换器的同步风力发电机无刷励磁系统的设计方案。旋转变换器的输入为直流电,经过全桥逆变电路和旋转变压器以后,将电能传递到旋转部分,再经过整流以后给同步风力发电机励磁绕组提供直流电。根据风速变化,控制励磁机的励磁从而可以控制同步发电机的励磁,使得输出电压恒定;在额定风速以下,获得最大风能利用系数;额定风速以上,保证输出功率恒定。通过Matlab/simulink对所提出的系统进行了建模仿真,仿真结果表明所提出的无刷励磁系统是正确可行的。

This paper introduces the principle of brushless excitation based on rotating converter,and presents design scheme of wind synchronous generator brushless excitation system based on rotating converter.The input signal for rotating converter is dc.Through the whole bridge inverter circuits and rotating transformer,electric power transferred to the rotating parts.AC from the exciter after a wind turbine rotating rectifier supply excitation.Simply follow the changes of wind speed to control the main exciter in order to control the excitation of synchronous generator,the constant output voltage can be obtained.In the following wind speed rating,the largest wind energy utilization factor can be obtained.It should be over the wind speed rating to make sure the output power is constant.Matlab/simulink has been used to develop the simulation models.The simulation results show that the brushless excitation system proposed in this paper is correct and feasible.