Research On The Key Technology Of Subway Integrated Supervisory Control System Based On Real-Time Database

Integrated Supervisory Control System(ISCS) is an essential part of the subway system. The ISCS integrates and interconnects all kinds of subway professional subsystems and uses a unified information management platform to monitor and control the full range of equipment based on modern computer technology, network technology, information technology and automation technology.In order to ensure that the ISCS in subway system is running reliably, stably and efficiently, this paper is dedicated to the design of real-time database and the development of data acquisition driver for ISCS, and completes the following tasks:(1) Analyzing the technology survey of the ISCS, then studying its function structure, control mechanism, integration and interconnection mechanism. Combined with the performance requirements of ISCS, the application of ISCS's key technologies is researched, such as real-time database and data acquisition driver development.(2) The design of real-time database is an important part of the ISCS. The structure of real-time database is designed from two aspects of hierarchy structure and management structure. Combined with the characteristics of the ISCS, the transaction scheduling strategy of real-time database is selected from the perspective of priority allocation. Achieving the data management function of real-time database from the aspects such as data structure, data processing and alarm processing. Respectively to realize real-time database's history file store and query functions, then put forward an improvement strategy of history file access by using memory mapping file technique. Designing the interface function of real-time database to the upper application and site plant, then achieving the equipment management function of realtime database to improve its extensibility.(3) As an extension module of real-time database, the data acquisition driver can increase its practicability and portability. Analysis of the Modbus communication protocol is the first step in the development of data acquisition driver, which includes analysis of the architecture and protocol specification of the Modbus RTU and Modbus/TCP. The Modbus data acquisition driver which supports RS485 and TCP communication modes is designed and developed by using the standard interface functions of the real-time database.Finally, the real-time database named DasRdb and Modbus data acquisition driver are applied in the Nanning East Station integrated transport hub project. After repeated testing, the ISCS which based on DasRdb can fully achieve the informational monitoring and management of subway system and has a certain industrial practical value.