中文摘要：

针对兆瓦级风电机组在额定风速以上的气流扰动时出现的载荷不平衡现象,提出了基于改进DE算法的独立变桨距控制策略。利用DE算法能够较快进行全局寻优的特点,缩小PID参数的搜索范围,提高动态响应能力。通过改进DE算法以改善其局部搜索能力,使调节过程具有较强的自适应性,从而得到最优的桨距角控制结果。最后,采用Matlab和Fast软件作为测试平台,对2 MW的独立变桨机组进行了仿真。结果表明,所提独立变桨控制策略能够有效降低机组在扰动情况下的载荷,缓解机组疲劳程度、延长机组寿命,有利于稳定输出功率,从而提高运行效率。

英文摘要：

Aiming at the load imbalance occurred in the air flow disturbance of megawatt wind turbine generator system at the rated wind speed, an individual pitch control strategy based on the improved differential evolution （ DE） algorithm is pro-posed. It uses the optimization of DE algorithm to narrow the search range of PID parameters and improve dynamic response capability. Through the improved DE algorithm, the local search ability is improved to make the adjustment process have a strong adaptability, thus the optimal control of pitch angle is obtained. Finally, Matlab and Fast software are adopted as the testing platform, and the simulation for 2 MW unit with individual pitch is carried out. The results show that the proposed indi-vidual pitch control strategy can effectively reduce the load of the unit under disturbance, relieve the fatigue degree of the unit and extend its life, which is good for maintaining the output power so as to improve the running efficiency.