中小型独立风电机组电传动偏航控制与实现

CONTROL AND PRACTICE OF MIDDLE AND SMALL STAND-ALONE WIND TURBINE WITH ELECTRIC-DRIVEN YAWING

为提高中小型独立风电机组运行的可靠性,设计了基于电传动控制技术的风电机组尾舵偏航系统,实现定桨距风力发电机在高风速区一定范围内具有稳定输出的调节能力以及在极端风速下的偏航保护。通过建立以电动直线执行机构为核心的偏航控制器的数学模型,采用以发电机转速和输出功率为输入信号的控制策略并对其进行仿真研究。该系统应用于现场海岛独立风电机组的偏航保护,通过分析大风条件下风力机输出功率特性曲线,结果表明该系统较好地完成了各风速区的设计要求。此项技术的应用可有效解决中小型独立风电机组的偏航保护,特别是在极端风速下可极大地提高此类风电机组生存能力的同时仍可实现风电机组的持续发电。

The over-speed protection and power regulation of middle and small wind turbine are indispensable for safety reasons and can avoid overload under strong wind. An active yaw system technology was designed based on electric-driven control, so as to accomplish the maximum wind energy tracking in low wind speed protection or even constant power output in high speed areas. The model of yaw controller which areas and the yaw depends on an electromechanical linear actuator was established, and corresponding simulation system was tested based on the control strategies with input signals of the rotor speed and the output power. The yaw system was applied to a prototype island wind turbine, and by analyzing the power characteristic curve under strong wind. The result indicate that the application of this method can solve the yaw protection problem of middle and small stand-alone wind turbine effectively, especially when suffering very strong wind it can greatly enhance the viability of such wind turbine,