具有调速器死区的LFC系统的广义自抗扰控制

Analysis and Design of LFC System with Governor Dead-band via Generalized Active Disturbance Rejection Control

为了消除调速器死区非线性对系统的影响和保证系统稳定,针对存在调速器死区的负荷频率控制(load frequency control,LFC)系统,采用了自抗扰控制(active disturbance rejection control,ADRC)方法,并通过描述函数法验证控制方法的有效性。提出死区线性化方法,并采用了广义自抗扰控制(generalized active disturbance rejection control,GADRC)方法。为能有效地消除死区非线性,提出了一种误差补偿策略。仿真结果显示,提出的误差补偿策略能有效地消除死区非线性,保证了系统的控制性能。提出通过描述函数法获得补偿系数的取值范围也是可行。

To eliminate the effect of the governor dead-band nonlinearities and guarantee the system stability, for load frequency control （LFC） of power systems with governor dead-band nonlinearity, the active disturbance rejection control （ADRC） was adopted, and the effectiveness of the control method was verified through the describing function method. A linearized method of dead-band was proposed, and the generalized active disturbance rejection control （GADRC） was adopted. Further, an error compensation scheme was proposed to eliminate the dead-band nonlinearities effectively. Simulation results show that the proposed error compensation scheme can eliminate the dead-band nonlinearity effectively and guarantee the control performance of the system. The describing function method can be proposed to obtain the range of the compensation coefficient.