天然气自动分输控制系统不稳定性研究

Study on Unstability of Natural Gas Automatic Sub-output Control System

SCADA系统是长输管道自动化水平较高的一套系统。在分输站基本工作在满负荷状态的情况下,分输量的自动控制能够工作在设定值附近,因而分输比较稳定。但实际工程中存在局部分输站分输量远小于设计分输量,使得站控系统的PLC参数难以整定,经常出现分输不稳定的现象。本文在不改变原系统结构的情况下,进行控制优化设计,从而实现了小流量下的平稳分输任务,并给出了算法实现。经现场实践取得了较好的分输控制效果。

SCADA is a set of systems with a higher automatic level of the long-distance pipeline. When the sub-transmission sta- tions in the state of full load, the automatic control of sub-output capacity is quite stable working at certain settings. However, partly sub-transmission stations sub-output capacity is far less than the design of sub-output capacity in actual projects, which makes the PLC control system parameter difficult to set. And unstable sub-output often appears. This paper gives the optimizing design to achieve stable sub-output in small flow, and gives the algorithms to achieve better effects for sub-output control on the practical spots under the condition of unchanging the original structure of the system.