双馈风力发电系统无速度传感器控制

Speed Sensorless Control of Doubly-fed Wind Generator System

变速恒频风电系统中,速度传感器的使用降低了双馈发电系统的可靠性。提出了一种基于坐标变换方式的双馈电机无速度传感器控制策略,利用电流、电压估算转子磁场的位置。为了验证该方法的正确性,使用DSP控制芯片构建了双馈风力发电实验系统,该系统无需增加额外的设备,算法简单易行,实验结果表明所提出的控制方法能够准确观测转子角度。

In the variable-speed constant-frequency wind power system, the use of speed sensor reduces the reliability of double-fed generator system. A speed sensorless control strategy of a doubly fed induction generator was presented,this control strategy is based on the coordinate transform, using the current and the voltage to estimate the position of the rotor. In order to verify the accuracy of the present method, a doubly fed induction machine sensorless digital control system based on DSP was implemented. The experimental results indicate that the proposed method can precisely estimate the position and speed of the rotor, without extra equipment, the algorithm is simple.