风电机组气动载荷控制策略

Control strategy of aerodynamic load for wind turbine

针对风电机组在风切效应影响下,较大尺寸的桨叶会加剧风轮所承受的不平衡气动载荷问题,提出了基于改进离散模糊控制的同步变桨距和基于桨叶方位角权系数分配的独立变桨距联合控制策略.通过主动变桨距控制来实现风电机组输出功率的稳定,同时降低风轮所承受的轴向气动载荷.仿真结果表明,此联合控制策略在风电机组的额定工作区间,不仅可以使风电机组的输出功率稳定在额定功率附近,而且还可以有效地抑制其轴向气动载荷,也直接证明了所提出的控制策略的有效性.

Aiming at the problem that under the influence of wind shear effect,the blade with a large size will aggravate the imbalanced aerodynamic load suffered by the wind rotor,a combined control strategy of both synchronous variable pitch based on modified discrete fuzzy control and individual variable pitch based on blade azimuth angle weight coefficient assignment was proposed. The stability of wind turbine output power was realized with the active variable pitch control,and meanwhile the axial aerodynamic load suffered by the wind rotor reduced. The simulation results showthat when the wind turbine runs at the rated working range,the combined control strategy can not only stabilize the fluctuation of output power near the rated power of wind turbine,but also effectively suppress its axial aerodynamic load. Therefore,the effectiveness of the proposed control strategy is directly proved.