【目的】随着智能化管道与智慧管网建设的快速发展及无人值守站场运行技术的广泛应用，天然气管道站场自动分输系统的作用愈发重要。【方法】针对某在役天然气管道站场普通分输系统存在人工操作频繁、无法精准控制等问题，从分输系统控制逻辑、场站控制系统自动化程度、分输支路操作便利性、运行安全性与经济性等多个方面进行了深入分析，提出基于站场原SCADA系统的天然气管道站场自动分输系统改造设计方案，即在原有站控系统ABPLC基础上，进行了自动分输系统控制逻辑开发和SCADA系统组态设计，实现了不均匀系数、剩余平均量、恒压控制、到量停输4种主要自动分输控制方式，同时新增了分输支路无扰切换、PID调节、自动分输启停、低流量保护、低压力保护、超压停输等多项辅助控制功能。【结果】该天然气管道站场经自动分输系统改造后可持续、稳定工作，大幅减少了操作人员现场巡检和操作频次，提高了分输的自动化水平和控制精度。该设计方案对站控PLC处理能力要求不高，可应用于新建管道自动分输系统建设，也可用于已投产管道站场自动分输系统的改造。【结论】该天然气管道站场自动分输系统改造设计方案可以有效降低投资成本与工期，助力站场无人值守及管道公司区域化管理目标的实现。（
图4，
表1，参
[19]）
[Objective] With the rapid development of intelligent pipelines and smart pipeline network construction, coupled with the widespread application of unattended station operation technologies, the automatic offtake system plays an increasingly significant role at natural gas pipeline stations. [Methods] This paper delves into the challenges posed by the conventional offtake system at an in-service natural gas pipeline station, such as frequent manual operations and imprecise control. A comprehensive analysis was conducted, covering aspects such as the control logic governing the offtake system, the degree of automation in the station control system, the operational convenience of offtake branches, operational safety, and cost-effectiveness. Consequently, a retrofit scheme was proposed for the automatic offtake system, leveraging the existing SCADA system at the station. The proposed design includes devising the control logic for the automatic offtake system and configuring the SCADA system, based on the existing station control system (AB PLC). This retrofit facilitates the introduction of four primary automatic offtake control modes: non-uniformity coefficient, residual mean, constant-pressure control, and volume-limit transmission shutdown. Furthermore, several supplementary control functions are integrated, comprising undisturbed offtake branch switching, PID regulation, automatic offtake startup/shutdown, low-flow protection, low-pressure protection, and transmission shutdown for overpressure prevention. [Results] Following the retrofit of the automatic offtake system, this natural gas pipeline station has been restored to continuous and stable operation. The retrofit led to a substantial reduction in the frequency of patrol inspections and manual operations while improving automation levels and the precision of offtake control. The design’s compatibility with the station control PLC, owing to its low processing demands, makes it ideal for establishing automatic offtake systems for new pipelines and upgrading existing ones at operational pipeline stations. [Conclusion] The proposed retrofit design for the automatic offtake system at natural gas pipeline stations is demonstrated to be efficient in reducing investment costs and construction periods. Furthermore, it is beneficial in achieving unattended station operation, thereby enhancing regional management for pipeline operators. (4 Figures, 1 Table, 19 References)
