直驱型风力发电机组控制策略研究

Control strategy research of direct driving type wind turbine

针对直驱型风力发电机组常规控制策略中因扭矩和转速振荡幅值大、持续时间长,导致整个机组在较长的时间内受到损害,从而影响机组可靠性及寿命的问题,对当前的直驱型风力发电机组的特点及需求进行了总结,阐述了直驱型风力发电机组的常规控制策略的基本原理。结合直驱型风力发电机组的特点及需求分析了常规控制策略中扭矩和转速振荡幅值大,且稳定时间较长的不足,在此基础上提出了在直驱型风力发电机组变流器控制策略中引入扭矩比例系数来优化传统控制策略的方法。仿真和测试平台试验结果验证了优化后控制策略的性能明显优于传统的控制策略;在风速变化范围相同的条件下,优化后的风电机组的扭矩和转速振荡幅值比传统控制策略的机组减少了40%,且振荡持续时间也减少了1/3,对风电机组的损害明显减小。该优化方法能明显的提高机组的可靠性,从而能有效延长机组的使用寿命。

Aiming at the reliability and lifetime of direct driving type wind turbine,for large torque and rotate speed vibration range and continue long time in conventional control strategy result in the damage to wind turbine, the characteristics and needs of direct driving type wind turbine technique were summarized and conventional control strategy theory was stated. The shortage of conventional control strategy was analyzed. On this basis, an optimal control strategy theory was proposed. In this theory, a torque ratio coefficient was added to control strategy of converter. By means of simulation and test platform experiment, the experimental results show that the performance of this optimal control strategy is superior to conventional control strategy. At the same condition of wind speed oscillation, the wind turbine of optimal control strategy than conventional control strategy, the torque and rotate speed vibration range reduce forty percent and continue time reduce one third, the damage to wind turbine is decreased. The results indicate that, by this optimal control strategy theory, the reliability of wind turbine is enhanced, the lifetime of wind turbine is prolonged.