CN204009409U - A kind of direct current cooker unit coordinatedcontrol system - Google Patents
A kind of direct current cooker unit coordinatedcontrol system Download PDFInfo
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- CN204009409U CN204009409U CN201420369029.2U CN201420369029U CN204009409U CN 204009409 U CN204009409 U CN 204009409U CN 201420369029 U CN201420369029 U CN 201420369029U CN 204009409 U CN204009409 U CN 204009409U
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- controller
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- decoupling compensator
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Abstract
The utility model belongs to power plant's automation field, be particularly related to a kind of direct current cooker unit coordinatedcontrol system, this system is comprised of pulverized coal preparation system, direct current cooker, steam turbine, power sensor, pressure transducer, enthalpy sensor, 3 PI controllers and decoupling compensator, and decoupling compensator is comprised of 8 PID controllers; Wherein, direct current cooker is divided into heating section and superheat section; Pulverized coal preparation system is connected with the heating section in direct current cooker, and heating section is connected with superheat section, and superheat section is connected with steam turbine, and 3 sensors are connected with 3 PI controllers, and 3 PI controllers are connected with decoupling compensator; The direct current cooker monoblock three input three output coordinating control system of setting up, can realize the decoupling zero between boiler side and steamer pusher side, fuel-side and feedwater side, have solved in current control method and have relied on combustion water than a difficult problem for coefficient.
Description
Technical field
The utility model belongs to power plant's automation field, particularly a kind of direct current cooker unit coordinatedcontrol system.
Background technology
Along with China's rapid development of economy and the propelling of building a resource-conserving society, the super (super-) critical Once-through Boiler machine with features such as high-level efficiency, low emission and load performance are strong consists of China thermal power generation main force unit.Due to features such as its single-machine capacity are large, the safe and stable operation of these units is the basic and crucial of large power network safety operation.
The coordinated control system object structure model of direct current cooker monoblock is reduced to one three input three output systems conventionally, its input quantity is confluent, quantity combusted and steam turbine pitch aperture, its output quantity is intermediate point temperature (specific enthalpy), main vapour pressure and steam turbine power, has association and the strong coupling phenomenon of intersecting between input/output variable.
In direct current cooker unit coordinatedcontrol system, most importantly confluent regulates and fuel quantity regulates, the correct coordination by regulating system with coordinate, make the load of boiler reach requirement, also make main steam temperature keep stablizing.Because the variation of fuel quantity and confluent all produces obviously impact to output power, generally adopt at present and adjust combustion water than coefficient control intermediate point temperature (specific enthalpy), the direct current cooker unit model of three input three outputs is reduced to the model of dual input dual output, therefore in practical engineering application, there are two kinds of different schemes: 1. take coal as basic water is with coal control, by fuel quantity, regulate load or main vapour pressure, confluent regulates intermediate point temperature (specific enthalpy); 2. take water as basic coal is with water management, by confluent, regulate load or vapour pressure, fuel quantity regulates micro-superheat section direct-contact desuperheater front and back temperature difference, guarantees combustion water ratio, realizes overheating steam temperature coarse adjustment.Yet two schemes cuts both ways, because feedwater is more faster than fuel adjusting, water is conducive to the control of main steam temperature with the control program of coal, but the fluctuation meeting of main steam pressure is very large, and coal is conducive to the control of main vapour pressure with the control program of water, be unfavorable for the maintenance of main steam temperature.In addition,, during due to ature of coal frequent variations, than the very difficult assurance of coefficient, often there is the problems such as parameter fluctuation amplitude is large, unit load bad adaptability in combustion water in unit running process.
Utility model content
A kind of direct current cooker unit coordinatedcontrol system the utility model proposes, control system is comprised of pulverized coal preparation system, direct current cooker, steam turbine, power sensor, pressure transducer, enthalpy sensor, 3 PI controllers and decoupling compensator; Wherein, direct current cooker is divided into heating section and superheat section; Pulverized coal preparation system is connected with the heating section in direct current cooker, and heating section is connected with superheat section, and superheat section is connected with steam turbine;
Power sensor one end is connected with steam turbine, and the other end is connected with the input end of a PI controller, by the current steam turbine power N detecting
ewith initial steam turbine power N
e0deliver to together the input end of a PI controller; The one output terminal of PI controller and the first input end of decoupling compensator are connected, and the first output terminal of decoupling compensator and the adjustment doors of steam turbine are connected, the Steam Turhine Adjustment door aperture u of its output
tfor controlling the adjustment doors aperture of steam turbine;
The superheat section of pressure transducer one end and direct current cooker is connected with the intermediate point of steam turbine, and the other end is connected with the input end of a PI controller, by the current main vapour pressure p detecting
twith initial main vapour pressure p
t0deliver to together the input end of the 2nd PI controller; The second input end of the output terminal of the 2nd PI controller and decoupling compensator is connected, and the second output terminal of decoupling compensator is connected with the feedwater control end of direct current cooker heating section, the confluent D of its output
ecbe used for controlling direct current cooker confluent;
Pt0 enthalpy sensor one end and the heating section of direct current cooker and the intermediate point of superheat section are connected, and the other end is connected with the input end of the 3rd PI controller, current intermediate point specific enthalpy h will be detected
mwith initial intermediate point specific enthalpy h
m0deliver to together the input end of the 3rd PI controller; The 3rd input end of the output terminal of the 3rd PI controller and decoupling compensator is connected, and the 3rd output terminal of decoupling compensator is connected with pulverized coal preparation system quantity combusted control end, the fuel command u of its output
bfor controlling the quantity combusted of pulverized coal preparation system, control.
Described decoupling compensator is comprised of 8 PID controllers, is respectively P1 controller, P2 controller, P3 controller, P4 controller, D1 controller, D2 controller, PD1 controller, these eight controllers of PD2 controller; Wherein, the first input end of decoupling compensator is connected with the input end of P1 controller, P2 controller, P3 controller, the second input end of decoupling compensator is connected with the input end of P4 controller, D1 controller, D2 controller, and the 3rd input end of decoupling compensator is connected with the input end of PD1 controller, PD2 controller; The first output terminal of the output terminal of P1 controller, P4 controller and decoupling compensator is connected, the output terminal of P2 controller, D1 controller, PD1 controller and the second output terminal of decoupling compensator are connected, and the 3rd output terminal of the output terminal of P3 controller, D2 controller, PD2 controller and decoupling compensator is connected.
A kind of direct current cooker unit coordinatedcontrol system the utility model proposes is simple in structure, can realize the decoupling zero between boiler side and steamer pusher side, fuel-side and feedwater side, has solved in current control method and has relied on combustion water than a difficult problem for coefficient.When intermediate point specific enthalpy departs from setting value, confluent and fuel quantity are adjusted simultaneously, can make system keep rapidly stable.Step with fuel quantity gain changes to reflect that ature of coal changes, when fuel quantity gain step reduces by 5%, intermediate point specific enthalpy, main vapour pressure, power and feedwater flow return to original numerical value after adjusting, fuel quantity raises to guarantee the normal operation of unit, and the response curve of coordinated control system is as shown in Fig. 2 .1-2.6.When feedwater specific enthalpy step declines 10% time, intermediate point specific enthalpy, main vapour pressure, power and fuel quantity return to original numerical value after adjusting, feedwater flow reduces to guarantee the normal operation of unit, and the response curve of coordinated control system is as shown in Fig. 3 .1-3.6.
Accompanying drawing explanation
Fig. 1 is that direct current cooker monoblock is coordinated control structure figure;
Coherent system response curve when Fig. 2 .1-2.6 is the variation of fuel gain step;
Coherent system response curve when Fig. 3 .1-3.6 changes for feedwater specific enthalpy step;
Fig. 4 .1-4.3 is load up coherent system response curve;
Fig. 5 .1-5.3 is load down coherent system response curve.
Embodiment
A kind of direct current cooker unit coordinatedcontrol system the utility model proposes, as shown in Figure 1, control system is comprised of pulverized coal preparation system, direct current cooker, steam turbine, power sensor, pressure transducer, enthalpy sensor, 3 PI controllers and decoupling compensator; Wherein, direct current cooker is divided into heating section and superheat section; Pulverized coal preparation system is connected with the heating section in direct current cooker, and heating section is connected with superheat section, and superheat section is connected with steam turbine;
Power sensor one end is connected with steam turbine, and the other end is connected with the input end of a PI controller, by the current steam turbine power N detecting
ewith initial steam turbine power N
e0deliver to together the input end of a PI controller; The one output terminal of PI controller and the first input end of decoupling compensator are connected, and the first output terminal of decoupling compensator and the adjustment doors of steam turbine are connected, the Steam Turhine Adjustment door aperture u of its output
tfor controlling the adjustment doors aperture of steam turbine;
The superheat section of pressure transducer one end and direct current cooker is connected with the intermediate point of steam turbine, and the other end is connected with the input end of a PI controller, by the current main vapour pressure p detecting
twith initial main vapour pressure p
t0deliver to together the input end of the 2nd PI controller; The second input end of the output terminal of the 2nd PI controller and decoupling compensator is connected, and the second output terminal of decoupling compensator is connected with the feedwater control end of direct current cooker heating section, the confluent D of its output
ecbe used for controlling direct current cooker confluent;
Pt0 enthalpy sensor one end and the heating section of direct current cooker and the intermediate point of superheat section are connected, and the other end is connected with the input end of the 3rd PI controller, current intermediate point specific enthalpy h will be detected
mwith initial intermediate point specific enthalpy h
m0deliver to together the input end of the 3rd PI controller; The 3rd input end of the output terminal of the 3rd PI controller and decoupling compensator is connected, and the 3rd output terminal of decoupling compensator is connected with pulverized coal preparation system quantity combusted control end, the fuel command u of its output
bfor controlling the quantity combusted of pulverized coal preparation system, control.
Decoupling compensator is comprised of 8 PID controllers, is respectively P1 controller, P2 controller, P3 controller, P4 controller, D1 controller, D2 controller, PD1 controller, these eight controllers of PD2 controller; Wherein, the first input end of decoupling compensator is connected with the input end of P1 controller, P2 controller, P3 controller, the second input end of decoupling compensator is connected with the input end of P4 controller, D1 controller, D2 controller, and the 3rd input end of decoupling compensator is connected with the input end of PD1 controller, PD2 controller; The first output terminal of the output terminal of P1 controller, P4 controller and decoupling compensator is connected, the output terminal of P2 controller, D1 controller, PD1 controller and the second output terminal of decoupling compensator are connected, and the 3rd output terminal of the output terminal of P3 controller, D2 controller, PD2 controller and decoupling compensator is connected.
1. the bidirectional compensating of steamer pusher side and boiler side.The disturbance of steamer pusher side is very micro-, negligible on the impact of intermediate point specific enthalpy.By main vapour pressure deviation signal Δ P
tbe introduced into steamer pusher side, can be used for the Steam Turhine Adjustment device action that make-up water side and fuel-side disturbance may cause, because main vapour pressure is similar with disturbance of feed-water response curve shape to fuel with power, make Δ P
tchange and Δ N
evariation cancel out each other, guarantee that steam turbine pitch aperture remains unchanged when boiler side disturbance.The deviation signal Δ N of power
ecompensating signal as the disturbance of steamer pusher side is incorporated into feedwater side and fuel-side, when steamer pusher side generation disturbance, due to changing in the opposite direction of power and intermediate point specific enthalpy, when guaranteeing that fuel-side instruction is constant, accelerates feedwater side and moves to guarantee main vapour pressure P
tstable, improved the responding ability of system.In addition, when changing power definite value, Steam Turhine Adjustment device changes very fast, makes to regulate porthole action to catch up with the demand of load instruction, but because the inertia of boiler is very large, energy is difficult to supplement in time, can cause main vapour pressure P
tlarge fluctuation, even can surpass the deviation range allowing, Δ P
tintroduce Steam Turhine Adjustment device, can play the effect of stablizing main vapour pressure.
2. the bidirectional compensating of side and the fuel-side of feeding water.When fuel-side generation disturbance, intermediate point specific enthalpy is identical with main vapour pressure change direction, and when feedwater side generation disturbance, the changing in the opposite direction of intermediate point specific enthalpy and main vapour pressure.By Δ h
mwith Δ P
tdifferential signal is introduced feedwater side and fuel-side simultaneously, can weaken or eliminate the coupling between feedwater side and fuel-side, makes adjusting of system become easy.Simultaneously be also equivalent to increase a backfeed loop fast in boiler side, can compensate the disturbance of steamer pusher side, improved the load responding speed of unit, strengthened the ability that system overcomes disturbance.
In order to verify the control performance of coordinated control system, this system is done to lifting load experiment, operating mode 1: unit by 677MW load up to 802MW; Operating mode 2: unit has 934MW load down to 802MW.Fig. 4 .1-4.3, Fig. 5 .1-5.3 have shown setting value and the response curve of two kinds of operating mode tubine power, intermediate point specific enthalpy and 3 output quantities of main vapour pressure.As can be seen from Figure, steam turbine power and main vapour pressure dynamic property are good, and intermediate point specific enthalpy is in course of adjustment certain dynamic deviation, and 3 output quantities can reach rapidly setting value, and the control performance of coordinated control system is good.
Using 1000MW ultra supercritical direct current cooker monoblock as control object, and its input quantity is confluent D
ec, burning instruction uB and steam turbine pitch aperture μ
t, its output quantity is intermediate point specific enthalpy h
m, main vapour pressure p
twith steam turbine power N
e.As shown in Figure 1, control system is comprised of 3 PI controllers and decoupling compensator direct current cooker unit three input three output coordinating control structures, and decoupling compensator can be realized full decoupled between each variable of input and output, Δ h
m, Δ p
twith Δ N
efor the output of PI controller, D
ec, u
band μ
tfor controlled quentity controlled variable, directly act in controlled device.The stove that this control system adopts, with machine control mode, by changing boiler input quantity, maintains the balance of machine capacity of furnace, keeps main vapour pressure, and the unit to external world response of load variations demand is good.Consider the coupled characteristic between direct current unit machine stove object, in control system, add decoupling compensator, the coupling that elimination machine stove plant characteristic exists, strengthened the ability of system customer service disturbance, realize the decoupling zero of steamer pusher side and boiler side, boiler interior feedwater side and fuel-side, make whole system be equivalent to three non-interfering single variable control systems.
The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (2)
1. a direct current cooker unit coordinatedcontrol system, is characterized in that, described control system is comprised of pulverized coal preparation system, direct current cooker, steam turbine, power sensor, pressure transducer, enthalpy sensor, 3 PI controllers and decoupling compensator; Wherein, direct current cooker is divided into heating section and superheat section; Pulverized coal preparation system is connected with the heating section in direct current cooker, and heating section is connected with superheat section, and superheat section is connected with steam turbine;
Power sensor one end is connected with steam turbine, and the other end is connected with the input end of a PI controller, by the current steam turbine power N detecting
ewith initial steam turbine power N
e0deliver to together the input end of a PI controller; The one output terminal of PI controller and the first input end of decoupling compensator are connected, and the first output terminal of decoupling compensator and the adjustment doors of steam turbine are connected, the Steam Turhine Adjustment door aperture u of its output
tfor controlling the adjustment doors aperture of steam turbine;
The superheat section of pressure transducer one end and direct current cooker is connected with the intermediate point of steam turbine, and the other end is connected with the input end of a PI controller, by the current main vapour pressure p detecting
twith initial main vapour pressure p
t0deliver to together the input end of the 2nd PI controller; The second input end of the output terminal of the 2nd PI controller and decoupling compensator is connected, and the second output terminal of decoupling compensator is connected with the feedwater control end of direct current cooker heating section, the confluent D of its output
ecbe used for controlling direct current cooker confluent;
Pt0 enthalpy sensor one end and the heating section of direct current cooker and the intermediate point of superheat section are connected, and the other end is connected with the input end of the 3rd PI controller, current intermediate point specific enthalpy h will be detected
mwith initial intermediate point specific enthalpy h
m0deliver to together the input end of the 3rd PI controller; The 3rd input end of the output terminal of the 3rd PI controller and decoupling compensator is connected, and the 3rd output terminal of decoupling compensator is connected with pulverized coal preparation system quantity combusted control end, the fuel command u of its output
bfor controlling the quantity combusted of pulverized coal preparation system, control.
2. system according to claim 1, it is characterized in that, described decoupling compensator is comprised of 8 PID controllers, is respectively P1 controller, P2 controller, P3 controller, P4 controller, D1 controller, D2 controller, PD1 controller, these eight controllers of PD2 controller; Wherein, the first input end of decoupling compensator is connected with the input end of P1 controller, P2 controller, P3 controller, the second input end of decoupling compensator is connected with the input end of P4 controller, D1 controller, D2 controller, and the 3rd input end of decoupling compensator is connected with the input end of PD1 controller, PD2 controller; The first output terminal of the output terminal of P1 controller, P4 controller and decoupling compensator is connected, the output terminal of P2 controller, D1 controller, PD1 controller and the second output terminal of decoupling compensator are connected, and the 3rd output terminal of the output terminal of P3 controller, D2 controller, PD2 controller and decoupling compensator is connected.
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| CN201420369029.2U CN204009409U (en) | 2014-07-04 | 2014-07-04 | A kind of direct current cooker unit coordinatedcontrol system |
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| CN201420369029.2U CN204009409U (en) | 2014-07-04 | 2014-07-04 | A kind of direct current cooker unit coordinatedcontrol system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062905A (en) * | 2014-07-04 | 2014-09-24 | 华北电力大学（保定） | Once-through boiler unit set coordinated control system and design method thereof |
| CN109441559A (en) * | 2018-10-15 | 2019-03-08 | 华北电力大学（保定） | A kind of balance tracking and controlling method of flexibility coordinated control system |
| CN109657909A (en) * | 2018-11-13 | 2019-04-19 | 北京国电龙源环保工程有限公司 | A kind of desulfurization based on big data grinds system ratio of water to material method of adjustment and system |
-
2014
- 2014-07-04 CN CN201420369029.2U patent/CN204009409U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062905A (en) * | 2014-07-04 | 2014-09-24 | 华北电力大学（保定） | Once-through boiler unit set coordinated control system and design method thereof |
| CN104062905B (en) * | 2014-07-04 | 2016-07-06 | 华北电力大学（保定） | A kind of direct current cooker unit coordinatedcontrol system and method for designing thereof |
| CN109441559A (en) * | 2018-10-15 | 2019-03-08 | 华北电力大学（保定） | A kind of balance tracking and controlling method of flexibility coordinated control system |
| CN109657909A (en) * | 2018-11-13 | 2019-04-19 | 北京国电龙源环保工程有限公司 | A kind of desulfurization based on big data grinds system ratio of water to material method of adjustment and system |
| CN109657909B (en) * | 2018-11-13 | 2022-07-29 | 国能龙源环保有限公司 | Big data-based water-material ratio adjusting method and system for desulfurization grinding system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20170704 |
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