变速直驱永磁风力发电机控制系统的研究

在直驱永磁风力发电系统中,永磁发电机的输出电压的幅值和频率随风速的波动而变化,不可直接并网。根据风力机运行特性和最佳风能利用原理,本文设计了由不可控AC/DC整流器和可控DC/AC逆变器组成的控制系统,通过控制逆变器的输出电压或电流实时跟踪给定值,来控制永磁发电机电磁转矩,实现最大风能的获取和无功功率可调。本文在理论上分析了方案的可行性,并搭建了基于DSPTMS320LF2407的实验室硬件平台。

Control System of Variable-speed Permanent-magnet Generator Directly Driven by Wind Turbine

The electric power from the permanent magnet generators direct driven by wind turbine can not be utilized by connecting the generator to the grid directly since the voltage and the frequency of the generator will change when the wind speed changes.Based on the performance characteristic of the turbine shaft and principle of optimum utilization of wind-energy,this paper discusses a control system composed of an uncontrollable AC/DC converter and a controllable DC/AC inverter.In order to achieve maximum energy capture and controllable reactive power,the opposing reaction torque of the generator is controlled by adjusting the AC voltage or current of the inverter to track the reference signal.This paper also analyzes the feasibility of the control method in theory and designs the typical experimental system based on DSPTMS320LF2407 for permanent-magnet generator direct driven by wind turbine.