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Automatic adjusting method for steam pump power output balance of thermal power generating unit

A thermal power unit, automatic adjustment technology, applied in the direction of machine/engine, pump, pump control, etc., can solve problems such as inappropriate parameter setting, reversed sequence of commands, main water flow fluctuations, etc., to improve the level of automatic control and eliminate artificial The effect of misoperation and stable water supply flow

Active Publication Date: 2017-06-20
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is highly dependent on the experience of the operating personnel. If the operating personnel are inexperienced or do not concentrate on work, it is easy to have inappropriate parameter settings or reverse the sequence of instructions, etc., and issue unreasonable instructions, causing the flow rate of the main water supply to be relatively large. Large fluctuations will affect the smooth operation of the unit, and may even cause serious accidents such as tripping

Method used

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  • Automatic adjusting method for steam pump power output balance of thermal power generating unit
  • Automatic adjusting method for steam pump power output balance of thermal power generating unit
  • Automatic adjusting method for steam pump power output balance of thermal power generating unit

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the implementation steps of the method for automatically adjusting the output balance of the steam pump of the thermal power unit in this embodiment include:

[0032] 1) Calculate the deviation between the set value of the water supply flow rate of the thermal power unit and the actual value of the water supply flow rate, and calculate the deviation through the first PID control module to output the water supply master control command;

[0033] 2) Calculate the average value of the actual inlet flow of the two steam pumps of steam pump A and steam pump B of the thermal power unit, and use the average value of the actual inlet flow as the inlet flow distribution value of each steam pump;

[0034] 3) Subtract the inlet flow rate of the steam pump A from the inlet flow distribution value, and calculate the difference obtained through the second PID control module to output the first control command, and add the main water supply control command a...

Embodiment 2

[0041] This embodiment is basically the same as Embodiment 1, and the main difference is that the control parameters of the second PID control module and the third PID control module among the three sets of PID control modules are further optimized.

[0042] Such as figure 2 As shown, in this embodiment, when the set value is calculated by the second PID control module, a different broken line function F is constructed in advance based on the first difference obtained by subtracting the feed water flow process value Pv from the feed water flow set value Sp 1 (x) and F 2 (x), the second difference obtained by subtracting the actual flow from the inlet flow distribution value of each steam pump to construct a different broken line function F 3 (x) and F 4 (x); determine the broken line function F according to the first difference obtained by subtracting the feedwater flow process value Pv from the feedwater flow set value Sp 1 (x) and F 2 The value of (x); subtract the actu...

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Abstract

The invention discloses an automatic adjusting method for steam pump power output balance of a thermal power generating unit. The method includes the implementation steps that the deviation between a feed water flow set value and a feed water flow actual value of each thermal power generating unit steam pump is calculated and then is output to a water master control instruction through a first PID control module; the average value of the actual inlet flow of the steam pump A and the actual inlet flow of the steam pump B of the thermal power generating unit is calculated to serve as an inlet flow assigned value of each steam pump; the inlet flow of the steam pump A is subtracted from the corresponding inlet flow assigned value, a first control instruction is output through a second PID control module, and the water master control instruction and the first control instruction are added to control the rotating speed of the steam pump A; and meanwhile, the inlet flow of the steam pump B is subtracted from the corresponding inlet flow assigned value, a second control instruction is output through a third PID control module, and the water master control instruction and the second control instruction are added and then control the rotating speed of the steam pump B. By the adoption of the automatic adjusting method, output power can be made automatic, fast and balanced when the steam pumps are in parallel operation, and feed water flow stability in the adjusting process of steam pump power output balance can be guaranteed.

Description

technical field [0001] The invention relates to a steam pump output balance adjustment technology of a thermal power unit, in particular to an automatic adjustment method for a steam pump output balance of a thermal power unit. Background technique [0002] In order to reduce power generation costs, pursue higher economic benefits, and meet increasingly stringent emission standards, thermal power generating units are gradually developing in the direction of large capacity and high parameters. Large-capacity and high-parameter unit equipment is numerous, which increases the labor intensity of operating personnel. Continuously improving the automation level of the unit and eliminating the unstable operation of the unit or even the tripping accident caused by human misoperation is a major issue that needs to be solved in the control of thermal power units. [0003] Water supply control is an important part of the thermal power unit control system. Most thermal power units abo...

Claims

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Application Information

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IPC IPC(8): F04B49/06F04B49/20F04B23/04F04B17/00
CPCF04B17/00F04B23/04F04B49/06F04B49/20
Inventor 王锡辉陈厚涛朱晓星王志杰
Owner STATE GRID CORP OF CHINA
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