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The SIMATIC PCS7 PS industrial steam turbine process control system is designed specifically for the reliable operation of industrial steam turbines and industrial power plants by Siemens, Germany. It is based on the SIMATIC S® product range and adds some special features required by the power station to meet the instrumentation requirements. Control requirements. Shandong Rizhao Wood Pulp Co., Ltd. ENK/63/63/137. Type 4 35 MW turbo-generators use this control system.
The control system operates and monitors using the Windows NT operating system, global automation standards, and the SIMATIC family of products. The process control system can realize all the functions required for industrial plant automation: (1) collecting and modulating process data; (2) open-loop and closed-loop control; (3) monitor monitoring, alarm, and operation control process screen monitoring; (4) and Process variable-related information storage (eg, important steam parameter curves); (5) System startup and restart, privileged access, time synchronization, and life monitoring; (6) Using graphical engineering tools, library software, and related functions Blocks facilitate project management of all system software; (7) Compatibility with other SIMATIC S5/S7 programmable controllers and third-party terminal interfaces.
2 Hardware Composition
The SIMATIC PCS7 PS control system consists of the following components: SIMATIC S7-400 programmable control system, distributed I/O with SIMATIC ET 200M input/output modules, based on WinCe
Graphical interface operation monitoring system, which uses fiber optic cables and two-core copper conductors as the transmission medium to communicate with SIMATIC NET (Industrial Ethernet and PROFIBUS PP protocols), an engineering station for project management with graphical tools CFC and SFC for general control and The software library of the plant control function integrates the turbine controller.
The control system is scalable. According to actual requirements, several operation and monitoring systems, several programmable controller interfaces, third-party system interfaces, etc. can be inserted. The SIMATIC PCS7 PS control system consists of Figure 1. 
The PCS7 PS control system contains all the functional modules required for the plant. In addition to the logical combination functions and calculation functions used for the conventional control, there are fully functional advanced function blocks that can ensure the open and closed loop control of the relevant components, such as the control of the motor and the pump, and can detect all devices. Faults of the function blocks and the error detection at the proper timing achieve the target error detection function.
The functional modules used are: operating mode switching module (ie single network operation and grid-connected operation mode switching), speed control module, process controller, power controller, speed and power setpoint control module, limited controller, extraction steam Pressure controller, additional extraction pressure controller, cylinder temperature protection module, starter module, low pressure starter starter module, medium pressure starter starter module, steam turbine module with extraction pressure regulator E1, extraction pressure regulator E2 Start turbine module, etc.
The operation and monitoring of the control system includes a standardized graphical user interface. Process operations are provided through different windows to meet the operator's specific needs. On the simulation screen, the entire (or part of) power plant process, pipelines, instrument control charts, etc. can be displayed. In addition to static displays, it also contains digital, bar, and color information about the system components (such as temperature, pressure, and configuration signals), allowing operators to easily operate and monitor the system.
4 Application in Industrial Steam Turbines
Shandong Rizhao Wood Pulp Co., Ltd. ENK/63/63/137. Type 4 steam turbine is a normal pressure pumping type, in order to meet the different pressure levels used in the production process, the use of double pumping and extractable adjustable type. Turbine control system adopts advanced digital electro-hydraulic speed control system (EHS), and 3 electromagnetic pulsed speed sensors (ST) transmit the collected speed signals to the control system through a data acquisition module in a three-selection manner. Siemens digital regulators, regulators through the analysis and comparison of the set value, the output feedback signal to the electro-hydraulic converter, the electro-hydraulic converter and then the proportional conversion of the (4 ~ 20) mA signal (0. 15 ~ 0. 45 ) The secondary oil pressure signal of MPa is used to drive the lift of the oil motor and the valve of the regulator valve to achieve the purpose of speed regulation.
The control system is also designed with automatic temperature difference protection system. Six hot resistance probes are installed at different points on the upper and lower cylinders of the steam turbine to measure the temperature of the upper and lower cylinders, and they are sent to the central processing unit through the acquisition module, and then through the cylinder temperature difference protection software module for comparative processing. During the steam turbine startup and speeding, the turbine is guaranteed to be The temperature difference between the cylinders meets the requirements to protect the steam turbine from rising too fast during the start-up process, causing excessive metal thermal stress.
In addition, the control system also has advanced automatic extraction pressure extraction function, can be a very sensitive and reliable one-level extraction, two extraction pressure protection, coordination of extraction and power generation. In addition, it shows considerable sensitivity and reliability during turbine control, security, and operation monitoring.
Application of PCS7 PS Control System in Industrial Steam Turbine
1 Overview 3 Software Composition