基于自抗扰技术的主汽温全程控制

Full Scope Control on the Main Steam Temperature Based on ADRC Technology

主汽温全程控制是火电机组启动优化的基础技术,但汽温过程的大滞延特性和模型不确定性使常规PID系统控制品质不好,甚至难以投入。针对此问题,设计了基于自抗扰技术的汽温全程控制系统。用时域加性摄动表示对象模型漂移,使系统可以利用关于对象的先验知识。跟踪微分器采用特定线性环节构成,简化了设计过程和控制器结构。试验表明,该系统有较强的鲁棒性和较好的控制品质,在工况大范围变化时,系统输出能很好地跟踪优化启动曲线。

Full Scope control on the main steam is a basic technology of the start-up optimization of power unit. The main steam temperature system is a typical controlled process with time-delay and time-varying parameters. And due to these typical characteristics, good control quality can not be gained when using the normal PID controller. In this paper, full scope control system on the main steam temperature based on the ADRC technology is present. The drift of the controlled model is denoted by the method of additive perturbation, and the trace differentiator is composed of special linear elements. Thus the structure of the controller is simplified and the designing process becomes easier. The experimental results show that the system has a sufficient capability for control and strong robustness. While significant change of operating conditions takes place, the output of the system traces the start-up optimization curve exactly.