一种具有参考模型的功率-频率控制方法

A Power-frequency Control Method with Reference Model

水电机组并入大电网运行时,水轮机调速器多采用功率调节模式,为保证良好的一次调频性能,当水轮机工况变化时需相应地调整PID控制参数。通过对不同控制方法下调节系统动态特性的分析,提出了一种具有参考模型的功率-频率控制方法,该方法通过参考模型根据当前水头和目标功率求得一次调频动作后的开度调整值,并通过PID闭环控制以提高调整精度。经过频率阶跃信号和电网实际频率信号下的仿真试验表明,在不同工况下采用固定的调节参数时,新方法均具有调节速度快、调节特性好的优点,一次调频指标满足电网的考核要求。

At present,the power regulation mode and frequency regulation mode of hydropower stations mostly adopt the same PID controller.When the working conditions are changed,the setting parameters of the primary frequency modulation should be changed frequently.In this paper,a power-frequency control method with reference model is put forward by analyzing the dynamic characteristics of control method.This method uses a reference model to obtain the adjustment value of the opening after the primary frequency modulation action according to the current head and target power and uses PID control to improve the adjustment accuracy.The simulation test under the frequency step sig⁃nal and the actual frequency signal shows that the new method has the advantages of fast regulation speed and good regulation characteristics when fixed regulation parameters are used under different working conditions.It can satisfy the requirements of the local power grid assess⁃ment.