变桨系统故障下风机极限载荷控制算法仿真设计与分析

Simulation and analysis of fan limit load control algorithm under pitch system fault

以风力发电机组变桨系统故障下单个叶片卡死无法调节变桨角度工况为研究对象,提出一种变桨故障下风机极限载荷控制算法,通过分析该工况下机组的不平衡载荷关系,根据坐标转换关系将面外弯矩转换为轮毂系统和偏航系统的极限载荷,通过载荷变化计算出最优的变桨角度进而降低风力发电机组各部件的极限载荷峰值。仿真结果表明,采用极限载荷控制算法可以明显降低风力发电机组在变桨系统故障下的极限载荷,进而保证机组运行的安全性,降低风机各子系统部件在该工况下的极限载荷。

A wind turbine ultimate load control algorithm is proposed for the condition where a single blade is stuck and unable to adjust the pitch angle under the fault of the wind turbine pitch system.By analyzing the unbalanced load relationship of the unit under this condition,the blade root load is converted into the ultimate load of the hub system and yaw system based on the coordinate transformation relationship.The optimal pitch angle is calculated through load changes to reduce the peak limit load of various components of the wind turbine.The simulation results show that using the ultimate load control algorithm can significantly reduce the ultimate load of wind turbines under pitch system faults,thereby ensure the safety of unit operation and reducing the ultimate load of various subsystem components of the wind turbine under this working condition.