基于转矩偏差的双馈风力发电机有功功率平滑控制

Active Power Smoothing Control Based on the Torque Error of Doubly Fed Induction Generator

风力发电机组运行在额定风速以下时,风速快速变化和风力发电机组的响应延迟引起输出有功功率波动,对并网运行不利。提出了一种新型风力发电机输出有功功率控制策略。在按照输出平滑有功功率的要求调节发电机转速的同时,根据测量参数,计算电磁转矩,根据电磁转矩偏差对转子励磁电压进行补偿,输出更加平滑的有功功率。仿真结果表明了上述方法的有效性。

Due to the characteristic of wind speed and the delay in response of WTG, the large fluctuation in generator＇s output active power that has adverse influence to grid is inevitably observed under rated wind speed region. A novel control strategy for output active power was presented. A compensatory voltage of the generator rotor was builded by calculating the electromagnetic torque and the errors of the torque when regulating the generator speed according to output smooth active power. The simulation results show the effectivity of the strategy.