CN103225801A - Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit - Google Patents

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

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CN103225801A
CN103225801A CN2013101151536A CN201310115153A CN103225801A CN 103225801 A CN103225801 A CN 103225801A CN 2013101151536 A CN2013101151536 A CN 2013101151536A CN 201310115153 A CN201310115153 A CN 201310115153A CN 103225801 A CN103225801 A CN 103225801A
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output
deviation
control system
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CN103225801B (en
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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
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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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

The Generator Set feed water control system of intelligence Multi-Mode PID
Technical field
The present invention relates to a kind of automatic control system, particularly a kind of PID automatic control system of the feed water system of boiler of large-scale thermal power machine group.
Background technology
The water supply system of existing thermal power generation unit adopts the electrically driven feed pump with fluid-flywheel clutch mostly, and while operating at full capacity, feed pump all moves.This feedwater collocation method ubiquity feed pump capacity and the fluid coupling unmatched problem of exerting oneself, the very large nonlinear characteristic of plant characteristic existence due to water supply system, existing preset parameter PID automatic control system can not adapt to the nonlinear characteristic of controlled device well, cause fluctuating widely of feedwater flow, cause the decline to thermal power generation unit control performance, even had influence on the safe operation of thermal power generation unit.
Summary of the invention
The invention provides a kind of Generator Set feed water control system of intelligent Multi-Mode PID, solved the nonlinear characteristic that existing preset parameter PID automatic control system can not adapt to controlled device, cause the technical problem fluctuated widely of feedwater flow.
The present invention overcomes the above problems by the following technical programs:
A kind of Generator Set feed water control system of intelligent Multi-Mode PID, comprise PID controller module and boiler feed pump in the generator feed water control system, boiler feedwater instruction F SPInput with the first subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE002
Connect the input of boiler feedwater POF F and the first subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE004
Connect, the deviation E that the output of the first subtraction block is boiler feedwater command quantity and boiler feedwater flow, the output of the first subtraction block respectively with the input of the first multiplier module
Figure 2013101151536100002DEST_PATH_IMAGE002A
, the division module the dividend input
Figure 2013101151536100002DEST_PATH_IMAGE002AA
, the input of differential module, the input of the 3rd absolute value block and the deviation input △ e of PID controller module be connected, the divisor input of division module and the output O of default value module 2Connect the output O of division module 1With the input of the first absolute value block, be connected, the output O of the first absolute value block 3Input with the power module
Figure 2013101151536100002DEST_PATH_IMAGE002AAA
Be connected, the output O of the number of times input of power module and the first constant module 4Connect the output O of power module 5Input with the second multiplier module
Figure 2013101151536100002DEST_PATH_IMAGE002AAAA
Be connected, the output O of another input of the second multiplier module and the second constant module 6Be connected, at the output of the second multiplier module, obtain a corrected parameter
Figure 2013101151536100002DEST_PATH_IMAGE006
, the input of the output of the second multiplier module and the first multiplier module
Figure 2013101151536100002DEST_PATH_IMAGE004A
Be connected, the output O of the first multiplier module 7Respectively with the input of the first ambiguity function functional module
Figure 2013101151536100002DEST_PATH_IMAGE008
, the second ambiguity function functional module input
Figure 2013101151536100002DEST_PATH_IMAGE008A
Input with the 3rd ambiguity function functional module
Figure 2013101151536100002DEST_PATH_IMAGE008AA
Connect the output △ E of differential module and the input of the 3rd multiplier module
Figure 2013101151536100002DEST_PATH_IMAGE008AAA
Connect the input of the output of the second multiplier module and the second subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE004AA
Link together, the output O of constant 1 module 8Input with the second subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE008AAAA
Connect the output O of the second subtraction block 9Input with the 3rd multiplier module
Figure 2013101151536100002DEST_PATH_IMAGE004AAA
Connect the output O of the 3rd multiplier module 10Respectively with the input of the first binary function functional module , the second binary function functional module input
Figure 2013101151536100002DEST_PATH_IMAGE004AAAAA
Input with the 3rd binary function functional module
Figure 2013101151536100002DEST_PATH_IMAGE004AAAAAA
Connect, the input of the output of differential module and the second absolute value block links together, the output O of the second absolute value block 11Input with the 3rd subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE008AAAAA
Link together, the output O of deviation variation rate valve limit value module 12Input with the 3rd subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE004AAAAAAA
Link together, the output O of the 3rd subtraction block 13With the input of the first high limit module, be connected, the switching value output O of the first high limit module 14With the input with the door module
Figure 2013101151536100002DEST_PATH_IMAGE008AAAAAA
Link together, the output O of the 3rd absolute value block 15Input with the 4th subtraction block
Figure 2013101151536100002DEST_PATH_IMAGE008AAAAAAA
Link together, the output O of deviation valve limit value module 16Input with the 4th subtraction block Link together, the output O of the 4th subtraction block 17With the input of the second high limit module, be connected, the switching value output O of the second high limit module 18With the input with the door module
Figure 2013101151536100002DEST_PATH_IMAGE004AAAAAAAA
Link together, with the switching value output O of door module 19With the switching value input s of analog quantity handover module (M25), link together, the output O of the 3rd binary function functional module 20Input with the analog quantity handover module
Figure 2013101151536100002DEST_PATH_IMAGE004AAAAAAAAA
Link together, the output O of constant 0 module 21Input with the analog quantity handover module
Figure 2013101151536100002DEST_PATH_IMAGE008AAAAAAAA
Link together, the output O of the first binary function functional module 22With the proportionality coefficient P input of PID controller module in the generating set feed water control system, link together, the output O of the second binary function functional module 23With the parameter I input time of integration of PID controller module in the generating set feed water control system, link together, the output O of analog quantity handover module 24With parameter D input derivative time of PID controller module in the generating set feed water control system, link together, the output of the PID controller module in the generator feed water control system is connected with the flow-control input of boiler feed pump.
The first binary function functional module, the second binary function functional module and the 3rd binary function functional module are the binary function module of following fuzzy control rule.Fuzzy control rule is changed artificial experience or expert's experience by fuzzy rule, final a kind of functional rule of controlling output.Bring in fuzzy rule is set in the binary function functional module by the setting of binary function functional module.
The present invention can be according to the variation of water supply system dynamic characteristic, pid parameter is adjusted on real-time online ground rapidly, solved the thermal power generation unit adopt 3 feed pumps and without in the stand-by pump situation in the unmatched situation of water management, dynamic tracing object characteristic, the stable feedwater flow of controlling, improved the economic index of unit and reached the purpose of energy-saving and emission-reduction.
The accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is characteristic and the parameter declaration table of each module used in the present invention.
The specific embodiment
At first, the first binary function functional module M15 is carried out to the function module property settings according to following table:
Figure 2013101151536100002DEST_PATH_IMAGE012
The first binary function functional module M15 is U=f1 (E, △ E) two independents variable are respectively the differential △ E of deviation E and deviation, the function of the first binary function functional module M15 is controlled quentity controlled variable U, upper table be exactly the differential △ E of controlled quentity controlled variable U and deviation E and deviation be the ambiguity function relation rule.
Then, the second binary function functional module M16 is carried out to the function module property settings according to following table:
Figure 2013101151536100002DEST_PATH_IMAGE014
Two independents variable of the second binary function functional module M16 are respectively the differential △ E' of deviation E' and deviation, the function of the second binary function functional module M16 is controlled quentity controlled variable U', upper table be exactly the differential △ E' of controlled quentity controlled variable U' and deviation E' and deviation be the ambiguity function relation rule.
Finally, the 3rd binary function functional module M17 is carried out to the function module property settings according to following table:
Figure 2013101151536100002DEST_PATH_IMAGE016
Two independents variable of the 3rd binary function functional module M17 are respectively deviation E " and differential △ E of deviation ", and the function of the 3rd binary function functional module M17 is controlled quentity controlled variable U ", controlled quentity controlled variable U " with deviation E " and the differential △ E of deviation " are the ambiguity function relation rule.
Three above fuzzy reasoning tables are that the control experience with Control Engineering knowledge and site operation personnel draws.
The Generator Set feed water control system of intelligent Multi-Mode PID of the present invention, comprise PID controller module and boiler feed pump in the generator feed water control system, boiler feedwater instruction F SPInput with the first subtraction block M1
Figure DEST_PATH_IMAGE002AAAAA
Connect the input of boiler feedwater POF F and the first subtraction block M1
Figure DEST_PATH_IMAGE004AAAAAAAAAA
Connect, the deviation E that the output of the first subtraction block M1 is boiler feedwater command quantity and boiler feedwater flow, the output of the first subtraction block M1 respectively with the input of the first multiplier module M10
Figure DEST_PATH_IMAGE002AAAAAA
, division module M5 the dividend input
Figure DEST_PATH_IMAGE002AAAAAAA
, the input of differential module M18, the input of the 3rd absolute value block M8 and the deviation input △ e of PID controller module be connected, the output O of the divisor input of division module M5 and default value module M19 2Connect the output O of division module M5 1With the input of the first absolute value block M6, be connected, the output O of the first absolute value block M6 3Input with power module M9
Figure DEST_PATH_IMAGE002AAAAAAAA
Be connected, the output O of the number of times input of power module M9 and the first constant M20 4Connect the output O of power module M9 5Input with the second multiplier module M11
Figure DEST_PATH_IMAGE002AAAAAAAAA
Be connected, the output O of another input of the second multiplier module M11 and the second constant module M21 6Be connected, at the output of the second multiplier module M11, obtain a corrected parameter
Figure DEST_PATH_IMAGE006A
, the input of the output of the second multiplier module M11 and the first multiplier module M10
Figure DEST_PATH_IMAGE004AAAAAAAAAAA
Be connected, the output O of the first multiplier module M10 7Respectively with the input of the first ambiguity function functional module M15 , the second ambiguity function functional module M16 input Input with the 3rd ambiguity function functional module M17 Connect the output △ E of differential module M18 and the input of the 3rd multiplier module M12
Figure DEST_PATH_IMAGE008AAAAAAAAAAAA
Connect the input of the output of the second multiplier module M11 and the second subtraction block M2 Link together, the output O of constant 1 module M26 8Input with the second subtraction block M2
Figure DEST_PATH_IMAGE008AAAAAAAAAAAAA
Connect the output O of the second subtraction block M2 9Input with the 3rd multiplier module M12
Figure DEST_PATH_IMAGE004AAAAAAAAAAAAA
Connect the output O of the 3rd multiplier module M12 10Respectively with the input of the first binary function functional module M15
Figure DEST_PATH_IMAGE004AAAAAAAAAAAAAA
, the second binary function functional module M16 input
Figure DEST_PATH_IMAGE004AAAAAAAAAAAAAAA
Input with the 3rd binary function functional module M17
Figure DEST_PATH_IMAGE004AAAAAAAAAAAAAAAA
Connect, the output of differential module M18 and the input of the second absolute value block M7 link together, the output O of the second absolute value block M7 11Input with the 3rd subtraction block M3
Figure DEST_PATH_IMAGE008AAAAAAAAAAAAAA
Link together, the output O of deviation variation rate valve limit value module M22 12Input with the 3rd subtraction block M3 Link together, the output O of the 3rd subtraction block M3 13With the input of the first high limit module M13, be connected, the switching value output O of the first high limit module M13 14With the input with door module M24
Figure DEST_PATH_IMAGE008AAAAAAAAAAAAAAA
Link together, the output O of the 3rd absolute value block M8 15Input with the 4th subtraction block M4
Figure DEST_PATH_IMAGE008AAAAAAAAAAAAAAAA
Link together, the output O of deviation valve limit value module M23 16Input with the 4th subtraction block M4
Figure DEST_PATH_IMAGE010A
Link together, the output O of the 4th subtraction block M4 17With the input of the second high limit module M14, be connected, the switching value output O of the second high limit module M14 18With the input with door module M24 Link together, with the switching value output O of door module M24 19With the switching value input s of analog quantity handover module M25, link together, the output O of the 3rd binary function functional module M17 20Input with analog quantity handover module M25
Figure DEST_PATH_IMAGE004AAAAAAAAAAAAAAAAAAA
Link together, the output O of constant 0 module M27 21Input with analog quantity handover module M25
Figure DEST_PATH_IMAGE008AAAAAAAAAAAAAAAAA
Link together, the output O of the first binary function functional module M15 22With the proportionality coefficient P input of PID controller module in the generating set feed water control system, link together, the output O of the second binary function functional module M16 23With the parameter I input time of integration of PID controller module in the generating set feed water control system, link together, the output O of analog quantity handover module M25 24With parameter D input derivative time of PID controller module in the generating set feed water control system, link together, the output of the PID controller module in the generator feed water control system is connected with the flow-control input of boiler feed pump.

Claims (2)

1. the Generator Set feed water control system of an intelligent Multi-Mode PID, comprise PID controller module and boiler feed pump in the generator feed water control system, it is characterized in that boiler feedwater instruction F SPInput with the first subtraction block (M1)
Figure 2013101151536100001DEST_PATH_IMAGE002
Connect the input of boiler feedwater POF F and the first subtraction block (M1)
Figure 2013101151536100001DEST_PATH_IMAGE004
Connect, the deviation E that the output of the first subtraction block (M1) is boiler feedwater command quantity and boiler feedwater flow, the output of the first subtraction block (M1) respectively with the input of the first multiplier module (M10)
Figure DEST_PATH_IMAGE002A
, division module (M5) the dividend input
Figure DEST_PATH_IMAGE002AA
, the input of differential module (M18), the input of the 3rd absolute value block (M8) and the deviation input △ e of PID controller module be connected, the output O of the divisor input of division module (M5) and default value module (M19) 2Connect the output O of division module (M5) 1With the input of the first absolute value block (M6), be connected, the output O of the first absolute value block (M6) 3Input with power module (M9)
Figure DEST_PATH_IMAGE002AAA
Be connected, the output O of the number of times input of power module (M9) and the first constant module (M20) 4Connect the output O of power module (M9) 5Input with the second multiplier module (M11)
Figure DEST_PATH_IMAGE002AAAA
Be connected, the output O of another input of the second multiplier module (M11) and the second constant module (M21) 6Be connected, the output of the second multiplier module (M11) is corrected parameter
Figure 2013101151536100001DEST_PATH_IMAGE006
, the input of the output of the second multiplier module (M11) and the first multiplier module (M10)
Figure DEST_PATH_IMAGE004A
Be connected, the output O of the first multiplier module (M10) 7Respectively with the input of the first binary function functional module (M15)
Figure DEST_PATH_IMAGE008
, the second binary function functional module (M16) input
Figure DEST_PATH_IMAGE008A
Input with the 3rd binary function functional module (M17)
Figure DEST_PATH_IMAGE008AA
Connect the input of the output △ E of differential module (M18) and the 3rd multiplier module (M12)
Figure DEST_PATH_IMAGE008AAA
Connect the input of the output of the second multiplier module (M11) and the second subtraction block (M2)
Figure DEST_PATH_IMAGE004AA
Link together, the output O of constant 1 module (M26) 8Input with the second subtraction block (M2)
Figure DEST_PATH_IMAGE008AAAA
Connect the output O of the second subtraction block (M2) 9Input with the 3rd multiplier module (M12)
Figure DEST_PATH_IMAGE004AAA
Connect the output O of the 3rd multiplier module (M12) 10Respectively with the input of the first binary function functional module (M15)
Figure DEST_PATH_IMAGE004AAAA
, the second binary function functional module (M16) input
Figure DEST_PATH_IMAGE004AAAAA
Input with the 3rd binary function functional module (M17)
Figure DEST_PATH_IMAGE004AAAAAA
Connect, the input of the output of differential module (M18) and the second absolute value block (M7) links together, the output O of the second absolute value block (M7) 11Input with the 3rd subtraction block (M3)
Figure DEST_PATH_IMAGE008AAAAA
Link together, the output O of deviation variation rate valve limit value module (M22) 12Input with the 3rd subtraction block (M3)
Figure DEST_PATH_IMAGE004AAAAAAA
Link together, the output O of the 3rd subtraction block (M3) 13With the input of the first high limit module (M13), be connected, the switching value output O of the first high limit module (M13) 14With the input with door module (M24)
Figure DEST_PATH_IMAGE008AAAAAA
Link together, the output O of the 3rd absolute value block (M8) 15Input with the 4th subtraction block (M4)
Figure DEST_PATH_IMAGE008AAAAAAA
Link together, the output O of deviation valve limit value module (M23) 16Input with the 4th subtraction block (M4)
Figure DEST_PATH_IMAGE010
Link together, the output O of the 4th subtraction block (M4) 17With the input of the second high limit module (M14), be connected, the switching value output O of the second high limit module (M14) 18With the input with door module (M24) Link together, with the switching value output O of door module (M24) 19With the switching value input s of analog quantity handover module (M25), link together, the output O of the 3rd binary function functional module (M17) 20Input with analog quantity handover module (M25)
Figure DEST_PATH_IMAGE004AAAAAAAAA
Link together, the output O of constant 0 module (M27) 21Input with analog quantity handover module (M25)
Figure DEST_PATH_IMAGE008AAAAAAAA
Link together, the output O of the first binary function functional module (M15) 22With the proportionality coefficient P input of PID controller module in the generating set feed water control system, link together, the output O of the second binary function functional module (M16) 23With the parameter I input time of integration of PID controller module in the generating set feed water control system, link together, the output O of analog quantity handover module (M25) 24With parameter D input derivative time of PID controller module in the generating set feed water control system, link together, the output of the PID controller module in the generator feed water control system is connected with the flow-control input of boiler feed pump.
2. the Generator Set feed water control system of a kind of intelligent Multi-Mode PID according to claim 1 is characterized in that:
Two independents variable of the first binary function functional module (M15) are respectively the differential △ E of deviation E and deviation, the function of the first binary function functional module (M15) is controlled quentity controlled variable U, the differential △ E of controlled quentity controlled variable U and deviation E and deviation is the ambiguity function relation, and its ambiguity function rule is following table:
U=f1(E,△E)
Figure DEST_PATH_IMAGE012
;
Two independents variable of the second binary function functional module (M16) are respectively the differential △ E' of deviation E' and deviation, the function of the second binary function functional module (M16) is controlled quentity controlled variable U', the differential △ E' of controlled quentity controlled variable U' and deviation E' and deviation is the ambiguity function relation, and its ambiguity function rule is following table:
U'=f2(E',△E')
Figure DEST_PATH_IMAGE014
;
Two independents variable of the 3rd binary function functional module (M17) are respectively deviation E " and differential △ E of deviation ", the function of the 3rd binary function functional module (M17) is controlled quentity controlled variable U "; the differential △ E of controlled quentity controlled variable U " with deviation E " and deviation " be the ambiguity function relation, its ambiguity function rule is following table:
U"=f3(E",△E")
Figure DEST_PATH_IMAGE016
。
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CN103807847A (en) * 2014-02-16 2014-05-21 国家电网公司 Large-capacity boiler whole-course water feeing control system
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CN104819453A (en) * 2015-05-08 2015-08-05 南通长航船舶配件有限公司 Ship boiler control system
CN111624899A (en) * 2020-06-30 2020-09-04 核工业理化工程研究院 Multi-mode control system and control method thereof for large-scale system

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