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Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit

A technology for control systems and generator sets, which is used in the control of water supply, steam generation, lighting and heating equipment, etc., can solve the problems of water supply flow fluctuations, inability to adapt to the nonlinear characteristics of the controlled object, etc., and achieve the effect of improving economic indicators.

Active Publication Date: 2013-07-31
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an intelligent multi-mode PID water supply control system for large-scale generator sets, which solves the technical problem that the existing fixed-parameter PID automatic control system cannot adapt to the nonlinear characteristics of the controlled object, resulting in large fluctuations in the water supply flow

Method used

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  • Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit
  • Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit
  • Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit

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Experimental program
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Embodiment Construction

[0010] First, set the first binary function function module M15 according to the following table for function module characteristic setting:

[0011]

[0012] The first binary function function module M15, that is, the two independent variables of U=f1(E,△E) are the deviation E and the differential △E of the deviation, and the function of the first binary function function module M15 is the control variable U, above The table is the control quantity U and the deviation E and the deviation △ E of the deviation is the relationship rule of the fuzzy function.

[0013] Then, the second binary function function module M16 is set according to the following table for function module characteristics:

[0014]

[0015] The two independent variables of the second binary function function module M16 are the deviation E' and the differential △E' of the deviation respectively. The function of the second binary function function module M16 is the control quantity U'. The above table i...

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Abstract

The invention discloses an intelligent multi-mode PID water-feeding control system for a large generator unit, and solves the problem that feedwater flow fluctuates substantially due to the fact that a conventional PID automatic control system with fixed parameters cannot adapt to a nonlinear characteristic of a controlled object. The water-feeding control system comprises a PID controller module in a generator water-feeding control system and a boiler water feeding pump; a function module, a differential module, a multiplication module, a division module, a subtraction module, a power module, a high value monitoring module and an analog quantity switching module in a distributed control system are adopted to construct a multi-mode fuzzy control real-time online optimizer; and the multi-mode fuzzy control real-time online optimizer accesses a PID closed-loop control system existing in a boiler to form an independent closed-loop control system of the water-feeding system, so that the stable control of the large boiler water-feeding system is realized, the stability of the main steam pressure and the main steam temperature of the boiler can be improved, and the accurate control of a unit load can be guaranteed.

Description

technical field [0001] The invention relates to an automatic control system, in particular to a PID automatic control system of a boiler feed water system of a large thermal power generating set. Background technique [0002] Most of the water supply systems of existing thermal power generating units use electric water supply pumps with hydraulic couplings, and all the water supply pumps run at full load. This water supply configuration method generally has the problem that the output of the water supply pump does not match the output of the hydraulic coupler. Due to the large nonlinear characteristics of the object characteristics of the water supply system, the existing fixed-parameter PID automatic control system cannot be well adapted. Due to the non-linear characteristics of the control object, the large fluctuation of the feed water flow rate leads to the decline of the control performance of the thermal power generating set, and even affects the safe operation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D5/26
Inventor 杜艳生周策张缠保段秋刚冯昌倪子俊张菊芳杨琦温武贾峰生于秀兰张健武瀚王晓慧张志刚郝丽华
Owner STATE GRID CORP OF CHINA
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