DCS (Distributed Control System) based integrated-control system of coal-fired power plant

Abstract

The invention discloses a DCS (Distributed Control System) based integrated-control system of a coal-fired power plant. The integrated-control system based on a DCS distributed control principle comprises a control system and a human-machine interaction device, and the control system comprises a unit control network and a public control network and exchanges information with an operator through the human-machine interaction device. The integrated-control system disclosed by the invention realize a remote control operation of whole plant auxiliary shops and electric systems by the DCS, and devices of the whole coal-fired power plant are designed and manufactured by united standards and specifications, thus the whole plant only needs to prepare a set of spare parts, and operation and maintenance costs can be largely reduced.

Description

technical field [0001] The invention relates to the field of electric power engineering design, in particular to an integrated control system for coal-fired power plants. Background technique [0002] The traditional auxiliary workshop control of coal-fired power plants adopts the method of programmable logic controller (PLC) controller + host computer. The PLC controller is internally solidified and controls the operation of the system according to the scheduling method of steps and cycles, and its reliability is very high. , but the real-time response capability of the system to emergencies is not high, there are many interfaces between different brands of PLC control systems, and the man-machine interface is not friendly enough, so it is difficult to realize centralized monitoring and various optimized control logics. With the further increase in the scale of thermal power units, the increase in the number of units, and the further improvement of unit parameters, the real...

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Problems solved by technology

[0002] The traditional auxiliary workshop control of coal-fired power plants adopts the method of programmable logic controller (PLC) controller + host computer. The PLC controller is internally solidified and controls the operation of the system according to the scheduling method of steps and cycles, and its reliability is very high. , but the real-time response capability of the system to emergencies is not high, there are many interfaces between different brands of PLC control systems, and the man-machine interface is not friendly enough, so it is difficult to realize centralized monitoring and various optimized control logics

With the further increase in the scale of thermal power units, the increase in the number of units, and the further improvement of unit parameters, the real-time requirements for the auxiliary workshop control system are rapidly increasing, and the control equipment is required to operate sensitively, respond quickly, handle correctly, and record accurately. Conventional PLC controllers It has been difficult to guarantee the real-time response capability of the control system

These factors limit the improvement of the control level of the power plant, which affects the improvement of the operation level and economy of the power plant

Moreover, the interface between the PLC control system and other systems is difficult, it is difficult to meet the requirements of the coordinated operation of the main and auxiliary systems of the power plant, and it is difficult to form an integrated control system for the whole plant

[0003] In addition, the electrical system of the power plant uses a large number of special control systems provided by various electrical equipment manufacturers. The software and hardware of each system are not compatible with each other. There are many interfaces between the systems, which makes project implementation difficult and equipment configuration is repeated, resulting in a lot of waste of resources and workload of operation and maintenance. Large, it is difficult to realize the centralized control of the whole plant

Because a large number of electrical quantities of the power plant need to be input into the ECS electrical control system for screen display and logic configuration, the traditional method is that each electrical quantity needs to be converted into a 4-20mA standard signal by a special transmitter, and then Then send it to the ECS electrical control system. This method not only uses a large amount of cables, but also many such as power factor transmitters are expensive, and the amount of maintenance also increases accordingly.

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