Hour mean value calculation system and method based on analog quantity of thermal power plant control system

Abstract

The invention discloses a hour mean value calculation system and method based on an analog quantity of a thermal power plant control system. The method comprises: equally dividing a set time period into a first time period, a second time period, a third time period and a fourth time period; collecting first time period analog quantity detection sampling data, and performing first time period accumulation on the first time period analog quantity detection sampling data to obtain a first time period accumulation result; when the analog quantity detection sampling data quantity in the first time period exceeds a threshold value, performing second time period accumulation to obtain a second time period accumulation result; when the analog quantity detection sampling data quantity in the second time period exceeds a threshold value, performing third time period accumulation to obtain a third time period accumulation result; when the analog quantity detection sampling data quantity in the third time period exceeds a threshold value, performing fourth time period accumulation to obtain a fourth time period accumulation result; and averaging the time period accumulation results. Statistical calculation of the hour mean value of the analog quantity can be achieved, the method can adapt to all task execution periods, and the load of a controller during statistical calculation is reduced to a great extent.

Description

technical field [0001] The invention relates to the technical field of DCS control in thermal power plants, in particular to an hourly average value calculation system and method based on analog quantities of a thermal power plant control system. Background technique [0002] At this stage, environmental protection requirements are becoming more and more stringent. Each thermal power plant is equipped with its own online monitoring system, which is used to monitor the real-time values ​​of sulfide and nitrogen oxides in the flue gas after combustion in real time, and to analyze the concentration of these pollutants within one hour. The average value has a strict assessment system. Since some control systems were developed relatively early, there is no special logical operation block for the hourly average value of pollutants. Therefore, the hourly average value of thermal power plants using imported DCS systems at this stage is either realized by the host computer or simply ...

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Problems solved by technology

Since some control systems were developed relatively early, there is no special logical operation block for the hourly average value of pollutants. Therefore, the hourly average value of thermal power plants using imported DCS systems at this stage is either realized by the host computer or simply accumulated through configuration. There is no way to achieve close coupling with the DCS system through the host computer, and the simple accumulation method through logical configuration is mostly cleared after 1 hour, and continuous statistics cannot be realized. Therefore, it is necessary to provide a method that can be directly implemented in the DCS system. Continuous statistical method from 1 minute to 24 hours

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