变速风力发电机组的变桨控制及载荷优化

针对额定风速以上,如何抑制变速风力发电机组因反馈信号滞后引起的输出功率波动以及机组载荷等控制技术问题进行研究。在研究了传统变桨控制的基础上,提出基于风扰动的前馈补偿控制与传统PID反馈信号相结合的变桨控制策略。通过MATLAB环境下进行仿真研究,结果表明:桨控制策略能够快速使风力机的输出转矩保持在额定转矩附近,减小风机转速波动以及风电机组传动链扭振,从而降低风电机组承受的气动载荷使得系统运行更加平稳。

Variable Pitch Control and Load Optimization for Variable Speed Wind Power Generation Systems

This paper discusses suppression of the output power fluctuation of the variable-speed wind power generation unit due to feed-back signal hysteresis occurring in case of wind velocity exceeding its rated value, as well as control technologies such as load of the machine group On the basis of a study on the traditional variable pitch control, it presents a variable pitch control strategy combining feed-forward compensation control based on wind disturbance and traditional PID feed-back signal. The result of simulation in the MATLAB environment shows that the designed variable pitch control strategy can quickly keep the output torque of the wind turbine in the vicinity of the rated torque, and reduce turbine speed fluctuations and torsional vibration of the drive chain of the wind turbine, thus lowering aerodynamic load of the turbine and ensuring more steady system operation.