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Method for correcting signal transmission error among DCS (Decentralized Control System) hardware

A technology of signal transmission and correction method, applied in the direction of engine components, comprehensive factory control, comprehensive factory control, etc., can solve the problem that the data involved in control or protection does not use communication, and the hardware accuracy cannot meet the requirements of the control system and the power grid. Power quality requirements and other issues, to achieve the effect of static error elimination, error elimination, and complete static error

Active Publication Date: 2011-02-16
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

[0002] In recent years, with the increase of the installed capacity of a single generator set and the improvement of operating parameters, the requirements for signal accuracy are getting higher and higher. In some cases, the existing hardware of the DCS system (that is, the distributed control system) can achieve The accuracy cannot meet the requirements of the control system, and even cannot meet the requirements of the power quality of the power grid. Not only in the field of power generation, but also in other control fields are facing similar problems
The DCS signal output side transmits the signal source data to the DCS signal input side through the AO card and AI card. Due to the hardware error caused by the card accuracy, there is a large gap between the data received by the DCS signal input side and the signal source data. Deviation, which affects the accuracy of the DCS system
[0003] With the application of communication technology in the DCS system, the use of communication to transfer data between DCS systems has gradually increased, but because the security of communication has not been widely accepted, important data such as data participating in control or protection have not generally adopted communication. way to transfer data

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  • Method for correcting signal transmission error among DCS (Decentralized Control System) hardware
  • Method for correcting signal transmission error among DCS (Decentralized Control System) hardware

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Embodiment Construction

[0011] In the supercritical 1000MW unit, the main control command of the steam turbine (or active power command) is sent from the DCS system to the analog input channel of the DEH system through a hardware analog output channel. The characteristic is converted into an instruction to adjust the opening of the steam valve, and the valve is operated to change the opening of the adjustable valve to change the intake air volume of the steam turbine to change the active power of the generator. This active power command plays an important role in the coordination of the boiler and the steam turbine. However, the active power command is output through the AO card of the DCS system and then input through the AI ​​card of the DEH. The channel error will inevitably be caused by the accuracy of the card. According to For some 1000MW units, the error can reach about 0.3% through observation and statistics, which means that the power command signal received by DEH deviates nearly 3MW from th...

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Abstract

The invention discloses a method for correcting signal transmission error among DCS (Decentralized Control System) hardware. In the process of signal transmission among the DCS hardware, an analog quantity signal is output through a system and then is input by the other system hardware, thus the precision of the hardware must bring a channel error for the signal transmission; and the economical performance of the system is directly influenced by an important analog quantity control signal. The invention provides the method for correcting signal transmission error among DCS hardware, which is characterized in that signal source data before correcting are directly taken as output data to be output; when correcting, deviation obtained by reducing communication feedback data from the output data before correcting passes through a step delay loop as hardware error, and then the signal source data are superposed with the hardware error to obtain the output data after correcting. The application of the method for correcting signal transmission error among DCS hardware can make the signal transmission error among the DCS hardware and realize the effects of completely removing static error and obviously reducing dynamic error, thereby improving the accuracy of the DCS.

Description

technical field [0001] The invention relates to the field of signal transmission between distributed control system hardware, in particular to a method for real-time correction of signal transmission errors between DCS hardware. Background technique [0002] In recent years, with the increase of the installed capacity of a single generator set and the improvement of operating parameters, the requirements for signal accuracy are also getting higher and higher. In some cases, the existing hardware of the DCS system (that is, the distributed control system) can achieve The accuracy cannot meet the requirements of the control system, and even cannot meet the requirements of the power quality of the power grid. Not only in the field of power generation, but also in other control fields are facing similar problems. The DCS signal output side transmits the signal source data to the DCS signal input side through the AO card and AI card. Due to the hardware error caused by the card a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418F01D17/00
CPCY02P90/02
Inventor 罗志浩张彩陈波尹峰
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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