Research on Interconnection and Communication Application of Air Compressor Control System in Thermal Power Plant

Research on Interconnection and Communication Application of Air Compressor Control System in Thermal Power Plants CHI Xinli1, ZHANG Zhiye2, SUN Fuming2, ZHANG Wei2 (1. Department of Automatic Control Engineering, Shenyang Institute of Technology, Shenyang 110136, China; 2. Huadian Tieling Power Generation Co., Ltd., Liaoning Tieling 112000) proposed a solution that uses the MODBUS protocol to complete the communication between two programmable controllers, OMRON and Mitsubishi, to realize the interconnection and communication between the two air compressor stations and the upper computer. The actual operation results show that the on-site data acquisition and processing time is in the order of milliseconds, which can meet the real-time requirements of the control system.

The air compressor system of the thermal power plant is a system that provides a reliable air source for the pneumatic operating valves and pneumatic tools of the factory, and provides a clean, oil-free and water-free compressed air system for the factory instrument. The safe and reliable operation of the air compressor control system is an indispensable part to ensure the safety and economic operation of the power plant. It is an important part of the auxiliary power system of the thermal power plant. 01. 300MW unit includes 2 sets of air compressor stations. 1 Air compressor station has 5 air compressors, and 2 air compressor stations have 7 air compressor control systems using OMRONCS1 series programmable controllers. The control management layer includes an engineering station and an operator station air compressor start-stop control, operation status, fault alarm, and current (ie, back to the 7j 1 control system network structure. This control system network is designed into 3 layers. Structure: The bottom layer is collected and processed by the Mitsubishi controller into a group of 12 air compressors. The intermediate control layer is realized by two OMRONCS1 series programmable controllers; the upper layer control management dubbing engineer station and The status and operation of each air compressor station of the operator station are set up by the control management operator's operation station. The monitoring network layer communication adopts OMRONCCLINK fiber network, and the field control layer passes the 0M-RONCS1PLC communication card SCB41, adopting MODBUS. communication with a compressor controller forms Mitsubishi 1: 5 and 1: 7, 2 compressor network chain stop, and running status, fault alarm, current (i.e., return water temperature signal) collected Mitsubishi controller. The internal state of the air compressor and the parameters enter the OMRONCS1PLC through MODBUS communication, and then sent to the operator station through the CCLINK fiber-optic communication network for monitoring.

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It shows that the data transmission and reception time between the main station OMRONCS1PLC and the slave station Mitsubishi PLC controller is in the order of ms, even if the analog temperature of the supply air temperature and air supply pressure is collected from the sensor to the upper computer operator station, the display time is also 1s. Within, it can meet the real-time requirements of the system.

Data communication operation status 2.4 Operation monitoring screen content There are two types of air compressors, that is, the sound between the air compressors in the same group of air compressor stations and the air compressors in the air compressors of two groups of air compressors. The sound can be divided into two types: the first sound and the second sound. The setting of the sound mode can be manually set by the operator on the host computer when there is a start command and one of the first sound or the second sound parallel signal. When the air compressor is in the stop state, there is no stop signal and the accident signal, the air compressor start command is issued.

The analog quantity includes: return water temperature, main motor current, supply air temperature, supply air pressure, fuel supply pressure, exhaust gas temperature, exhaust pressure and oil inlet pressure.

Points monitored include: light fault, heavy fault, emergency stop, host overload, fan overload, power supply abnormality, water pressure abnormality, P1 shutdown, 1C shutdown, T1 shutdown, T2 shutdown, high ambient temperature shutdown, voltage abnormality, AP3 shutdown , P1LOW, P1HIGH, P3LOW, air filter blockage, oil filter blockage, P1 alarm, ambient temperature alarm, SRC alarm, SPR alarm, high pressure side alarm, 316 alarm stop, T1LOW, temperature sensor fault, pressure sensor fault, 210 alarm stop.

3 Conclusion There are many sounds and parameters involved in the air compressor control system. The original control system is basically manual operation, and the operator has a high labor intensity. At the same time, the air compressor is also a high-energy-capacity sound. The start-stop control will not waste a lot of energy in time. In addition, in most thermal power plants, the control system of the entire power plant can be decomposed into several relatively independent parts, the main auxiliary machine control system. Controllers are often implemented using programmable controllers from different manufacturers. Therefore, when the system is upgraded or modified, users need to solve the interconnection and communication problems between different systems. Through the transformation of the air compressor control system of Tieling Power Plant, the interconnection and communication between the OMRONCS1 series programmable controller and the Mitsubishi controller is realized. The solution can meet the real-time requirements of the control system. After the control system is modified, the unit is not only improved. The level of automation, but also conducive to energy conservation and environmental protection, worthy of actual promotion and application.

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