CN103225801B - 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 PDFInfo
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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
The present invention relates to a kind of automatic control system, more particularly to a kind of PID automatic control systems 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 is mostly using the electrically driven feed pump with fluid-flywheel clutch, and feed pump is all run when operating at full capacity.This feedwater collocation method generally existing feed pump capacity and fluid coupling are exerted oneself unmatched problem, because there is very big nonlinear characteristic in the plant characteristic of water supply system, existing preset parameter PID automatic control systems can not be well adapted for the nonlinear characteristic of controlled device, cause fluctuating widely for feedwater flow, cause the decline to thermal power generation unit control performance, or even have influence on the safe operation of thermal power generation unit.
The content of the invention
The invention provides a kind of Generator Set feed water control system of intelligent Multi-Mode PID, the nonlinear characteristic that existing preset parameter PID automatic control systems do not adapt to controlled device is solved, the technical problem fluctuated widely of feedwater flow is caused.
The present invention is to solve problem above by the following technical programs：
A kind of Generator Set feed water control system of intelligent Multi-Mode PID, including PID controller module and boiler feed pump in generator feed water control system, boiler feedwater instruction FSPWith the input of the first subtraction blockThe input of connection, boiler feedwater pump output flow F and the first subtraction blockConnection, the output end of the first subtraction block is the deviation E of boiler feedwater command quantity and boiler feedwater flow, the input of the output end of the first subtraction block respectively with the first multiplier module, dividing module dividend input, derivative module input, the input of the 3rd absolute value block be connected with the deviation input △ e of PID controller module, the divisor input of dividing module and the output end O of default value module2Connection, the output end O of dividing module1It is connected with the input of the first absolute value block, the output end O of the first absolute value block3With the input of power moduleIt is connected, the number of times input of power module and the output end O of first constant module4Connection, the output end O of power module5With the input of the second multiplier moduleIt is connected, another input of the second multiplier module and the output end O of second constant module6It is connected, a corrected parameter is obtained in the output end of the second multiplier module, the input of the output end of the second multiplier module and the first multiplier moduleIt is connected, the output end O of the first multiplier module7Respectively with the input of the first ambiguity function functional module, the second ambiguity function functional module inputWith the input of the 3rd ambiguity function functional moduleConnection, the output end △ E of derivative module and the input of the 3rd multiplier moduleConnection, the input of the output end of the second multiplier module and the second subtraction blockLink together, the output O of the module of constant 18With the input of the second subtraction blockConnection, the output end O of the second subtraction block9With the input of the 3rd multiplier moduleConnection, the output end O of the 3rd multiplier module10Respectively with the input of the first binary function functional module, the second binary function functional module inputWith the input of the 3rd binary function functional moduleConnection, the input of the output end of derivative module and the second absolute value block links together, the output end O of the second absolute value block11With the input of the 3rd subtraction blockLink together, the output end O of deviation variation rate valve limit module12With the input of the 3rd subtraction blockLink together, the output end O of the 3rd subtraction block13It is connected with the input of the first high limit module, the output switch parameter end O of the first high limit module14With the input with door moduleLink together, the output end O of the 3rd absolute value block15With the input of the 4th subtraction blockLink together, the output end O of deviation valve limit module16With the input of the 4th subtraction blockLink together, the output end O of the 4th subtraction block17It is connected with the input of the second high limit module, the output switch parameter end O of the second high limit module18With the input with door moduleLink together, the output switch parameter end O with door module19With analog quantity handover module（M25）On-off signal end s link together, the output end O of the 3rd binary function functional module20With the input of analog quantity handover moduleLink together, the output end O of the module of constant 021With the input of analog quantity handover moduleLink together, the output end O of the first binary function functional module22Linked together with the proportionality coefficient P input of the PID controller module in generating set feed water control system, the output end O of the second binary function functional module23Linked together with the time of integration parameter I input of the PID controller module in generating set feed water control system, the output end O of analog quantity handover module24Linked together with the derivative time parameter D input of the PID controller module in generating set feed water control system, the output end of the PID controller module in generator feed water control system and the flow control signal of boiler feed pump are connected.
First binary function functional module, the second binary function functional module and the 3rd binary function functional module are the binary function module for following fuzzy control rule.Fuzzy control rule is that the experience of artificial experience or expert is changed by fuzzy rule, a kind of functional rule of final control output.Fuzzy rule is set in binary function functional module by the setting end of binary function functional module.
The present invention can be according to the change of water supply system dynamic characteristic, adjust pid parameter rapid real-time online, solve thermal power generation unit using 3 feed pumps and without in the case of stand-by pump to water management it is unmatched in the case of, dynamic tracking plant characteristic, stability contorting feedwater flow, improves the economic index of unit and reaches the purpose of energy-saving and emission-reduction.
Brief description of the drawings
Fig. 1 is the circuit structure block diagram of the present invention；
Fig. 2 is the characteristic and parameter declaration table of each module used in the present invention.
Embodiment
First, function module property settings are carried out according to the following table in the first binary function functional module M15：
First binary function functional module M15 is U=f1 (E, △ E) two independents variable be respectively deviation E and the differential △ E of deviation, first binary function functional module M15 function is controlled quentity controlled variable U, and the differential △ E that upper table is exactly controlled quentity controlled variable U and deviation E and deviation are ambiguity function relation rule.
Then, function module property settings are carried out according to the following table in the second binary function functional module M16：
Second binary function functional module M16 two independents variable are respectively deviation E' and the differential △ E' of deviation, second binary function functional module M16 function is controlled quentity controlled variable U', and the differential △ E' that upper table is exactly controlled quentity controlled variable U' and deviation E' and deviation are ambiguity function relation rule.
Finally, function module property settings are carried out according to the following table in the 3rd binary function functional module M17：
3rd binary function functional module M17 two independents variable are respectively the deviation E differential △ E of deviation " and ", and the 3rd binary function functional module M17 function is controlled quentity controlled variable U ", and the differential △ E " of controlled quentity controlled variable U " and deviation E " and deviation are ambiguity function relation rule.
More than three fuzzy reasoning tables be to control the control experience of engineering knowledge and site operation personnel to draw.
The Generator Set feed water control system of the intelligent Multi-Mode PID of the present invention, including PID controller module and boiler feed pump in generator feed water control system, boiler feedwater instruction FSPWith the first subtraction block M1 inputConnection, boiler feedwater pump output flow F and the first subtraction block M1 inputConnection, the first subtraction block M1 output end is the input of the deviation E, the first subtraction block M1 of boiler feedwater command quantity and boiler feedwater flow output end respectively with the first multiplier module M10, dividing module M5 dividend input, derivative module M18 input, the 3rd absolute value block M8 input be connected with the deviation input △ e of PID controller module, dividing module M5 divisor input and default value module M19 output end O2Connection, dividing module M5 output end O1It is connected with the first absolute value block M6 input, the first absolute value block M6 output end O3With power module M9 inputIt is connected, power module M9 number of times input and first constant M20 output end O4Connection, power module M9 output end O5With the second multiplier module M11 inputIt is connected, the second multiplier module M11 another input and second constant module M21 output end O6It is connected, a corrected parameter is obtained in the second multiplier module M11 output end, the second multiplier module M11 output end and the first multiplier module M10 inputIt is connected, the first multiplier module M10 output end O7Respectively with the first ambiguity function functional module M15 input, the second ambiguity function functional module M16 inputWith the 3rd ambiguity function functional module M17 inputConnection, derivative module M18 output end △ E and the 3rd multiplier module M12 inputConnection, the second multiplier module M11 output end and the second subtraction block M2 inputLink together, the module M26 of constant 1 output O8With the second subtraction block M2 inputConnection, the second subtraction block M2 output end O9With the 3rd multiplier module M12 inputConnection, the 3rd multiplier module M12 output end O10Respectively with the first binary function functional module M15 input, the second binary function functional module M16 inputWith the 3rd binary function functional module M17 inputConnection, derivative module M18 output end and the second absolute value block M7 input link together, the second absolute value block M7 output end O11With the 3rd subtraction block M3 inputLink together, deviation variation rate valve limit module M22 output end O12With the 3rd subtraction block M3 inputLink together, the 3rd subtraction block M3 output end O13It is connected with the first high limit module M13 input, the first high limit module M13 output switch parameter end O14With the input with door module M24Link together, the 3rd absolute value block M8 output end O15With the 4th subtraction block M4 inputLink together, deviation valve limit module M23 output end O16With the 4th subtraction block M4 inputLink together, the 4th subtraction block M4 output end O17It is connected with the second high limit module M14 input, the second high limit module M14 output switch parameter end O18With the input with door module M24Link together, the output switch parameter end O with door module M2419Linked together with analog quantity handover module M25 On-off signal end s, the 3rd binary function functional module M17 output end O20With analog quantity handover module M25 inputLink together, the module M27 of constant 0 output end O21With analog quantity handover module M25 inputLink together, the first binary function functional module M15 output end O22Linked together with the proportionality coefficient P input of the PID controller module in generating set feed water control system, the second binary function functional module M16 output end O23Linked together with the time of integration parameter I input of the PID controller module in generating set feed water control system, analog quantity handover module M25 output end O24Linked together with the derivative time parameter D input of the PID controller module in generating set feed water control system, the output end of the PID controller module in generator feed water control system and the flow control signal of boiler feed pump are connected.
Claims (1)
1. a kind of Generator Set feed water control system of intelligent Multi-Mode PID, including PID controller module and boiler feed pump in generator feed water control system, it is characterised in that boiler feedwater instructs FSPWith the first subtraction block（M1）InputConnection, boiler feedwater pump output flow F and the first subtraction block（M1）InputConnection, the first subtraction block（M1）Output end be the deviation E of boiler feedwater command quantity and boiler feedwater flow, the first subtraction block（M1）Output end respectively with the first multiplier module（M10）Input, dividing module（M5）Dividend input, derivative module（M18）Input, the 3rd absolute value block（M8）Input be connected with the deviation input △ e of PID controller module, dividing module（M5）Divisor input and default value module（M19）Output end O2Connection, dividing module（M5）Output end O1With the first absolute value block（M6）Input be connected, the output end O of the first absolute value block (M6)3With power module（M9）InputIt is connected, power module（M9）Number of times input and first constant module（M20）Output end O4Connection, power module（M9）Output end O5With the second multiplier module（M11）InputIt is connected, the second multiplier module（M11）Another input and second constant module（M21）Output end O6It is connected, the second multiplier module（M11）Output end be corrected parameter, the second multiplier module（M11）Output end and the first multiplier module（M10）InputIt is connected, the first multiplier module（M10）Output end O7Respectively with the first binary function functional module（M15）Input, the second binary function functional module（M16）InputWith the 3rd binary function functional module（M17）InputConnection, derivative module（M18）Output end △ E and the 3rd multiplier module（M12）InputConnection, the second multiplier module（M11）Output end and the second subtraction block（M2）InputLink together, the module of constant 1（M26）Output end O8With the second subtraction block（M2）InputConnection, the second subtraction block（M2）Output end O9With the 3rd multiplier module（M12）InputConnection, the 3rd multiplier module（M12）Output end O10Respectively with the first binary function functional module（M15）Input, the second binary function functional module（M16）InputWith the 3rd binary function functional module（M17）InputConnection, derivative module（M18）Output end and the second absolute value block（M7）Input link together, the second absolute value block（M7）Output end O11With the 3rd subtraction block（M3）InputLink together, deviation variation rate valve limit module（M22）Output end O12With the 3rd subtraction block（M3）InputLink together, the 3rd subtraction block（M3）Output end O13With the first high limit module（M13）Input be connected, the first high limit module（M13）Output switch parameter end O14With with door module（M24）InputLink together, the 3rd absolute value block（M8）Output end O15With the 4th subtraction block（M4）InputLink together, deviation valve limit module（M23）Output end O16With the 4th subtraction block（M4）InputLink together, the 4th subtraction block（M4）Output end O17With the second high limit module（M14）Input be connected, the second high limit module（M14）Output switch parameter end O18With with door module（M24）InputLink together, with door module（M24）Output switch parameter end O19With analog quantity handover module（M25）On-off signal end s link together, the 3rd binary function functional module（M17）Output end O20With analog quantity handover module（M25）InputLink together, the module of constant 0（M27）Output end O21With analog quantity handover module（M25）InputLink together, the first binary function functional module（M15）Output end O22Linked together with the proportionality coefficient P input of the PID controller module in generating set feed water control system, the second binary function functional module（M16）Output end O23Linked together with the time of integration parameter I input of the PID controller module in generating set feed water control system, analog quantity handover module（M25）Output end O24Linked together with the derivative time parameter D input of the PID controller module in generating set feed water control system, the output end of the PID controller module in generator feed water control system and the flow control signal of boiler feed pump are connected.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104633648A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Analog quantity control method for feed pump set with different powers |
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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 |
| CN103791485B (en) * | 2014-02-28 | 2015-04-22 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN104819453A (en) * | 2015-05-08 | 2015-08-05 | 南通长航船舶配件有限公司 | Ship boiler control system |
| CN104791765A (en) * | 2015-05-08 | 2015-07-22 | 南通长航船舶配件有限公司 | Ship boiler water feed regulation system |
| CN104806999A (en) * | 2015-05-08 | 2015-07-29 | 南通长航船舶配件有限公司 | Ship boiler feedwater regulation 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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