Research On Control System Of Industrial Steam Turbine Based On PLC

With the rapid development of industry technology, the industrial steam turbine is widely applied to the field of industry, such as petrifaction, electric power, metallurgy, architectural material, environment protection, energy sources, etc. Since the characteristic of industrial steam turbine is of high temperature, high pressure and high rotate speed, the control system which takes on the task of controlling rotate speed, load and run status directly affects security, reliability, economy and automation degree of running unit. Nowadays, the industrial steam turbine almost adopts to mechanism-hydraulic control system. It has some disadvantages, such as low governing precision and automatization degree, difficult realization of communication with Distributed Control System (DCS), fixed work characteristic, small governing function, etc. However, the import electro hydraulic control system has some disadvantages of high cost, inconvenient maintenance, bad currency, etc. So it is indispensable to develop the electro hydraulic control system with excellent performance, high reliability, good currency and high performance-price ratio for industrial steam turbine.For the running safety of industrial steam turbine, the article discusses the design of electro hydraulic servo system and S7-300 PLC controller according to development process of industrial steam turbine electro hydraulic servo control system based on S7-300 PLC. The thesis outlines the development of domestic and aboard industrial steam turbine control system. The thesis establishes the scheme of the control system as a whole, and designs the part of electro hydraulic servo, and establishes the mathematical model of the system. Then, the system of dynamic simulation is performed by means of Matlab. The controller is SIEMENS S7-300 PLC. The thesis introduces its principle, structure and hardware, and configurates hardware, software and communication. Human-computer interface is WinCC and TP170B. The configuration of upper computer and touch panel was performed. The friendly interface has been developed.The results show that the system effectively adjusts and protects the industrial steam turbine. The use of electro hydraulic servo system improves control precision and response speed of the industrial steam turbine. The application of upper computer and touch panel improves automatization degree, which is convenient for monitoring and management of operator, and realizes remote transmission of monitoring data, and is in favor of realizing Total Plant Solution (TPS). It is facility to mount and maintain, reliable to operate, and precise to adjust and detect. The monitoring software has abundant functions and kind interface.