OPC技术及其在南水北调中线工程自动化调度系统中的应用

水量调度系统是南水北调中线工程自动化调度系统的核心组成部分,由闸站监控系统采集的水位、流量、闸门开度等监测数据反映了输水干渠水量调度控制的实时状态,是水量调度系统中控制指令生成必不可少的输入参数。因此,需要建立水量调度系统与闸站监控系统之间的数据通信。根据OPC基本原理和数据访问规范,提出了基于OPC技术的系统集成方案,即在水量调度系统中开发OPC客户端应用程序,用于实时获取闸站监控系统采集的监测数据,并将指令发送到闸站监控系统。实践表明,基于OPC技术的集成方案能够很好地实现两个应用系统之间的数据传递,降低了系统集成的成本,增强了系统的稳定性和灵活性。

Application of OPC Technique in Automatic Dispatching System of the Middle Route of South-to-North Water Diversion Project

Water regulation system is one of the core compositions of automatic dispatching system of the middle route of the South-to-North Water Diversion Project (MSNWDP). The survey data such as the canal water level, flow rate, and sluice gate opening a collected by monitoring devices reflect the real-time state of water transfer control in the canal, and they are the necessary input data for the water regulation system. Consequently, an appropriate data transfer approach is needed between the water regulation system and sluice gate monitoring system. Based on the basic principle and data access specification of OPC technique, this paper proposed an OPC-based system integration scheme to retrieve the real-time survey data from sluice gate monitoring system and to send control orders back to sluice gate monitoring system. The implementation of water regulation system in the Jingshi Section of MSNWDP suggested that the proposed OPC-based integration scheme can better realize the data transfer between the two systems with the reduction of the integration cost and improvement of the system stability and flexibility.