摘要：随着国内管道干线管网的不断建成,天然气管道站场分输控制成为被广泛关注的工程问题。在工程实施过程中,输气站场投运初期测量值与设定值误差大,以及下游天然气用户存在调峰周期等问题逐渐显露出来。为了解决该类问题并适应调控中心分输日指定的控制要求,文中提出了一种解决方案,该方案基于常见站场分输支路流程,详述了控制器的比选逻辑和PID控制器的设计过程,给出了对分输流程复杂工况的控制方案,并在西气东输二线站场中取得了较好的应用效果。

摘要：要实现天然气无人化自动分输,依靠简单的控制往往费时、费力、不易满足工艺过程要求,调节精度不高,存在天然气超输、少输,分输不稳定,分输中断等情况,无法满足下游供气需求。为解决这一问题,现以某集输工程外输装置天然气分输为例,结合正常工况和特殊工况,利用检测仪表、调节阀、安全切断阀,控制系统等手段,对分输管线进行分输控制方案设计和优化,对下游用户进行智能流量调配,并对输气管道采取安全联锁保护措施。工程运行结果表明:通过优化的控制方案,实现了分输管线压力和流量的自动调节控制,并保证了多路输气管道的连续、安全、平稳运行。无人化自动分输避免了人工频繁操作,提高了自动化水平,优化了劳动用工,降低了人工成本,提高了公司的智能化管理水平和生产效率,满足了下游用户的不同需求,为今后的天然气分输提供参考价值。To achieve unmanned automatic distribution of natural gas, relying on simple control is often time-consuming, laborious and difficult to meet the requirements of the process, the adjustment accuracy is not high, there are natural gas over-transportation, less transportation, unstable transportation, transportation interruption and other situations, can not meet the downstream gas supply demand. To solve this problem, Now, taking the natural gas distribution transportation of gas export unit of some gathering and transportation project as an example, combining normal and special process conditions, using detection instruments, regulating valves, safety and shutdown valves, control system and other means, the distribution control scheme of the distribution pipeline is designed and optimized, the intelligent flow allocation is carried out for downstream users, and the safety interlock protection measures are taken for the gas transmission pipeline. The results of the engineering operation show that the automatic control of pressure and flow is realized by optimizing the control scheme, and the continuous, safe, and stable operation of the multi-channel gas transmission pipeline is ensured. The unmanned automatic distribution avoids frequent manual operation, improves the level of automation, optimizes labor employment, reduces labor costs, improves the intelligent company’s management level and production efficiency, and meets the different needs of downstream users, it provides reference value for the future distribution of natural gas.

摘要：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。

摘要：在不改变自动分输控制系统原系统结构的情况下,设计了一种基于模糊控制原理的自适应PID控制器,根据偏差和偏差变化率来实时调整参数KP,KI和KD,实现了小流量下的平稳分输任务.在天然气分输系统业务中取得了较好的分输控制效果,并给出了控制优化设计和软硬件改造方案.现场运行表明,这种模糊自适应PID控制器比常规PID控制器有更好的控制效果,改善了系统的动态响应性能和稳态性能,对改善和优化工业控制系统动态行为有现实意义和参考价值.