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随着分布式SCADA系统在铁路牵引供电应用的不断推广,SCADA系统节点之间以及与其他异构系统之间进行消息数据传递面临着效率降低、接口不统一等问题。针对此问题,提出一种基于发布/订阅模式的分布式SCADA消息中间件的设计方案,该方案使用了N-Tree结构将系统消息进行逻辑区域划分,设计了一套完善的消息传递与反馈处理机制,方案中利用Quorum-Based改进型算法确保了分布式节点的消息一致性。实践及仿真实验证明,本方案提高了SCADA系统的消息传递效率,降低了分布式系统的运行负载和通信开销。
With the continuous promotion of distributed SCADA system in the application of railway traction power supply, the transmission of message data between SCADA system nodes and other heterogeneous systems faces the problems of reduced efficiency and inconsistent interfaces. In order to solve this problem, this paper proposes a design scheme of distributed SCADA message middleware based on publish / subscribe mode. This scheme uses N-Tree structure to divide the logical area of system messages and designs a complete set of message passing and feedback processing Mechanism, program using Quorum-Based improved algorithm to ensure that the distributed node message consistency. Practice and simulation experiments show that this scheme improves the efficiency of SCADA system’s message transmission and reduces the operating load and communication overhead of distributed system.