电力系统供电负荷稳定性优化控制研究

Optimum Control Research on Power Supply Load Stability of Power System

对于电力系统来说,供电负荷稳定性优化控制的重要目的是保证系统稳定和电能质量。但是,在实际工业控制中,调速器死区、限幅限速以及发电速率约束(generation rate constraint,GRC)等非线性特性是普遍存在的。因此,系统性能会受到恶化,甚至出现不稳定。为了保证系统稳定和消除这些非线性特性对系统的影响,提出了线性自抗扰控制(linear active disturbance rejection control,LADRC)方法。并在LADRC的基础上,提出了误差补偿策略。仿真结果显示,所设计的控制器结构简单,计算方便,便于应用。提出的误差补偿策略能很好地改善和恢复系统的控制性能。所以,提出的LADRC方法和补偿策略是可行且有效。

For the power system, the important purpose of power supply load stabilizing optimal control is to guarantee the stability of the system and power quality. However, the nonlinear characteristics are common in industrial control, e.g. , governor dead-zone, the speed limit and generation rate constraint （GRC）. Therefore, the dynamic performance will be degraded, and even unstable. To guarantee the stability of the system and eliminate the effect of the nonlinearities, a linear active disturbance rejection control （LADRC） method is presented. And then, an error compensation scheme is proposed for LADRC. Simulation results show that the structure of the designed controller is simple, convenient and easy to be applied. The control performance of the system can be recovered and improved well via the proposed error compensation scheme. Therefore, the proposed method of LADRC and the compensation scheme are feasible and effective.