永磁同步风电机组功率平滑控制策略研究

Research on Power Smoothing Control Strategy for Permanent Magnet Synchronous Wind Turbine Units

大型风电机组普遍采用转矩-转速控制实现最大风能跟踪,传统控制策略下风机输出功率随着风速的变化而剧烈波动,影响了电网的稳定运行。在分析永磁同步风电机组运行特性的基础上,提出全风速范围内基于变桨的风电机组功率平滑控制策略,结合变桨和转矩控制实现风机跟踪给定功率,同时控制发电机低转速运行,抑制阵风时风电机组超速。基于MATLAB/Simulink,对一台2.5 MW高速永磁同步风力发电机进行仿真研究。结果表明,提出的控制策略能够有效抑制功率波动。

Large wind turbine units generally adopt torque-rotational speed control to realize maximal wind energy tracking. According to the traditional control strategy, the output power of the wind turbine fluctuates sharply with the change of wind velocity, thus affecting steady operation of the power network. Based on an analysis of the operational characteristics of the permanent magnet synchronous wind turbines, this paper presented a power smoothing control strategy based on variable pitch over the entire range of wind velocity. Variable pitch and torque control was applied to achieve the preset power of the wind turbine. In the meantime, the generator was made to operate at a low speed, and over speed was suppressed during wind gusts. Simulation study was made on a 2.5 MW high-speed permanent magnet synchronous wind turbine on the basis of MATLAB/Simulink. The results indicated that the proposed control strategy could effectively suppress power fluctuations.