厂站自动化系统从客户/服务器到客户/集群服务器结构的改造

目前许多厂站自动化系统采用客户/服务器结构.文中提出了在厂站自动化系统中实现从客户/服务器模式到客户/集群服务器模式转变的一种思路和实现方案,并且分析了其优点和难点.客户/集群服务器模式可提供一种更为灵活的服务端结构,它通过集群服务能够很好地均衡服务端负载,解决或减轻单纯客户/服务器结构中遇到的问题.该方案已在NSC300UX系统中得到应用.

Transformation from Client/Server to Client/Cluster Structure in Power Plant and Substation Automation Systems

Many SCADA/EMS systems with Client/Server structure have been applied to power plants or substations at present. In such a system, there are some problems at the server end, such as high load on the main server, low availability and low service-speed especially at peak time when there are many signals waiting to be processed etc. Client/Cluster is a more flexible architecture at the server end that can solve or lighten the problems mentioned above by balancing load among servers better. In a system with Client/Cluster structure, server computers connected through fast LAN work together closely to provide high quality services as a whole. An application scheme for the transformation from Client/Server structure to Client/Cluster structure is presented and merits of the design are evaluated. Some difficulties are also pointed out in the realization, especially for shared storage. The practice in NSC300UX system proves that in this scheme the performance of servers can be improved effectively at the cost of a little modification.