计及电网频率波动敏感特性的双馈风电机组优化发电控制策略

为协调优化提高风电机组发电量目标和限制机组功率波动目标,提出一种带滤波器的改进转矩控制策略.在风力机空气动力学、机组转子运动学和风机控制原理的基础上,考虑自然风频谱特征和电网调频敏感频段,推导并建立了机组转速和输出功率对风速的小信号分析模型.基于工作点处转速和功率对风速的传递函数,对比分析了常规转矩控制和改进转矩控制的...

Optimal Generation Control Strategy for DFIG Considering Grid Frequency Fluctuation Sensitivity

To improve the power production of a wind energy conversion system(WECS) while limiting its power fluctuations simultaneously, an improved torque control strategy with filter is proposed. Based on wind turbine aerodynamics, rotor kinematics and the generator control principle, considering the natural wind spectrum characteristics and the sensitive frequency band of power grid, the small signal analysis models of rotational speed and output power with respect to wind speed are derived and established. On the basis of the transfer functions of rotational speed and power with respect to wind speed, the control performances under the conventional and modified torque control are compared and analyzed. The analysis results show that the proposed control strategy improves the dynamic tracking performance of WECS in the case of mid-low frequency wind. Meanwhile, it limits the power fluctuations in the high-frequency band to which the power grid is sensitive, thus achieving the comprehensive optimization, i.e., improvement in power production and limit of power fluctuations. Finally, a 1.5 MW DFIG system was established on the co-simulation platform of BLADED and RTDS, and simulation and experimental results verified the correctness of theoretical analysis and the effectiveness of the proposed control strategy.