CN106356895A - Method for promoting wind power generation by heat storage of combined heat and power plant - Google Patents
Method for promoting wind power generation by heat storage of combined heat and power plant Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005338 heat storage Methods 0.000 title claims abstract description 33
- 238000010248 power generation Methods 0.000 title claims abstract description 8
- 230000001737 promoting effect Effects 0.000 title abstract description 3
- 239000003245 coal Substances 0.000 claims abstract description 26
- 238000005457 optimization Methods 0.000 claims abstract description 12
- 230000035699 permeability Effects 0.000 claims abstract description 12
- 230000033228 biological regulation Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 60
- 238000009825 accumulation Methods 0.000 claims description 31
- 230000005619 thermoelectricity Effects 0.000 claims description 23
- 230000029087 digestion Effects 0.000 claims description 21
- 238000000605 extraction Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000008901 benefit Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- JOCBASBOOFNAJA-UHFFFAOYSA-N N-tris(hydroxymethyl)methyl-2-aminoethanesulfonic acid Chemical compound OCC(CO)(CO)NCCS(O)(=O)=O JOCBASBOOFNAJA-UHFFFAOYSA-N 0.000 claims description 3
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- 238000001764 infiltration Methods 0.000 description 1
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention relates to a method for promoting wind power generation by heat storage of a combined heat and power plant. The method comprises the following steps: (1) obtaining the capacity and wind power permeability of a heat storage system according to a preset combined heat and power plant model with the heat storage system; (2) obtaining a target optimization function of the minimum coal consumption of a power system according to a heat load constraint function, a heat storage system capacity constraint function and a wind power output constraint function; (3) obtaining the minimum coal consumption value of the power system by using a generalized reduced gradient algorithm of a VBA platform according to the target optimization function of the minimum coal consumption of the power system; and (4) obtaining an operation mode I or an operation mode II, which can effectively reduce the wind power generation stopping rate, of the heat storage system according to the minimum coal consumption value of the power system, the capacity of the heat storage system and the wind power permeability under a condition of a relatively low heat load, and obtaining an operation mode III, which can effectively reduce the wind power generation stopping rate, of the heat storage system under a condition of a relatively high heat load. The method can improve the peak load regulation capacity of the combined heat and power plant and effectively promote the wind power generation.
Description
Technical field
The present invention relates to a kind of method promoting wind electricity digestion, especially with regard to one kind thermoelectricity used in wind-powered electricity generation field
The method that coproduction unit heat accumulation promotes wind electricity digestion.
Background technology
With the fast development of wind power technology, China has become the maximum country of global wind-powered electricity generation installation scale, by 2014
In the end of the year, the installation of China wind-powered electricity generation has reached 115gw, but but persistently being dropped using hourage of China's wind-power electricity generation, main cause
It is: cogeneration units are occupied an leading position in China's power supply architecture, especially in the winter time, for meeting heat demand, thermoelectricity unit
Often maintain higher level of exerting oneself under the operational mode of electricity determining by heat, and it is abundant to be now that wind-resources collect neutralization the most
Period, the high output of Wind turbines and cogeneration units adds up and causes power supply and demand unbalance, and winter supply of electric power is substantially high
In electricity needs, occur abandoning wind in a large number in the load valley period.As shown in figure 1, the cogeneration units with heat reservoir, its
Including cogeneration units 1, heat accumulation unit 2, heat distribution pipe network 3 and supply thermal region 4.Cogeneration units 1 pass through 3 points of heat distribution pipe network
It is not connected with heat accumulation unit 2 with for thermal region 4.Therefore, abandon wind ratio to reduce electrical network, effectively facilitate wind electricity digestion, need to fill
Divide the peak regulation potentiality excavating cogeneration units.
Content of the invention
For the problems referred to above, it is an object of the invention to provide a kind of cogeneration units heat accumulation promotes the side of wind electricity digestion
Method, it can lift the peak modulation capacity of cogeneration units, and effectively facilitates wind electricity digestion.
For achieving the above object, the present invention takes technical scheme below: a kind of cogeneration units heat accumulation promotes wind-powered electricity generation to disappear
The method received is it is characterised in that it comprises the following steps: 1) basis pre-sets the cogeneration units model with heat reservoir,
Obtain heat reservoir capacity and wind-powered electricity generation permeability；2) according to thermic load constraint function, heat reservoir capacity constraint function and wind-powered electricity generation
Units limits function, obtains the objective optimization function of power system minimum coal consumption amount；3) according to power system minimum coal consumption amount
Objective optimization function, using the broad sense reduced gradient algorithm of vba platform, obtains the minimum coal consumption value of power system；4) according to electricity
The minimum coal consumption value of Force system, heat reservoir capacity and wind-powered electricity generation permeability, using the broad sense reduced gradient algorithm of vba platform, obtain
To when thermic load is relatively low, the heat reservoir method of operation one or the heat reservoir method of operation two can effectively reduce wind-powered electricity generation and abandon wind rate；
When thermic load is higher, the heat reservoir method of operation three can effectively reduce abandons wind rate.
Preferably, described step 1) in, according to known electric load characteristic, wind-force power producing characteristics and thermic load characteristic, if
Put the cogeneration units model with heat reservoir；Cogeneration units model with heat reservoir includes storing up heat release calculation mould
Type, heat Balance Calculation model and thermoelectricity relation.
Preferably, described store hot computation model hs,t+1For: hs,t+1=hs,t-hi,t-hr,t, in formula: hs,tRepresent t
The heat of storage, hi,tRepresent t dispersed heat, for day circulation heat storage system, radiation loss is below 3%；hr,tGeneration
The heat of table t release.
Preferably, described heat Balance Calculation model htFor: ht=hr,t+hex,t, in formula, hex,tRepresent cogeneration units vapour
The heat that draws gas that turbine provides.
Preferably, the thermoelectricity relation of the described cogeneration units with heat reservoir, thermoelectricity unit maximum power generation pmax
Determined by the maximum and extraction flow of main steam flow, thermoelectricity unit minimum generated output pminBy main steam flow
The minima of little value, extraction flow and condensing flow determines.
Preferably, described step 2) in, the constraint function of load is:
In formula, qi,tFor cogeneration units heating load,For heat reservoir heating load, ηlFor heat reservoir efficiency, ht
Represent thermic load；The constraint function of heat reservoir capacity is:
In formula,Represent heat reservoir quantity of heat storage,Represent heat reservoir maximum quantity of heat storage, ωebRepresent heat reservoir
Maximum capacity；The constraint function of wind power output is:
0≤pj,t≤wj,t, t=1,2 ..., t, j ∈ ωwf,
In formula, pj,tRepresent that wind-powered electricity generation is actual to exert oneself, wj,tRepresent that wind-powered electricity generation theory is exerted oneself.
Preferably, according to thermic load constraint function, heat reservoir capacity constraint function and wind power output constraint function, obtain
The objective optimization function of power system minimum coal consumption amount is:
In formula, ci(pi,t,qi,t) it is cogeneration units coal consumption, cj(pj,t) it is simple generating set coal consumption.
Preferably, described step 4) in, the described heat reservoir method of operation one is: section heat accumulation at ordinary times, the heat release of paddy period；Institute
Stating the heat reservoir method of operation two is: section and peak period heat accumulation at ordinary times, the heat release of paddy period；The described heat reservoir method of operation three
For: according to the dynamic heat accumulation of power system peak regulation demand and heat release.
Preferably, described step 4) in, when heat storage capacity is less than 10000m3, the increase of heat storage capacity can reduce abandons wind rate,
And there is limit with capacity increase and successively decrease benefit；When heat storage capacity is more than 10000m3When, the increase of heat storage capacity is abandoned to reduction
Wind rate does not significantly act on.
Due to taking above technical scheme, it has the advantage that the 1, present invention using the heat with heat reservoir to the present invention
Unit model is produced in Electricity Federation, according to the minimum coal consumption value of power system, heat reservoir capacity and wind-powered electricity generation permeability, lifting cogeneration of heat and power
The peak modulation capacity of unit, effectively facilitates wind electricity digestion, improves the utilization rate of wind-powered electricity generation.2nd, the present invention is in different wind-powered electricity generation permeabilities
Under, obtain abandoning wind rate and be gradually lowered and diminishing marginal benefits with the increase of heat storage capacity.3rd, the present invention adopts cogeneration of heat and power
The method that unit heat accumulation promotes wind electricity digestion, can expand the space of dissolving of wind-powered electricity generation further, be wind power cost and investment decision
Important references are provided.
Brief description
Fig. 1 is the structural representation of the cogeneration units with heat reservoir in prior art；
Fig. 2 is the cogeneration units thermoelectricity relation schematic diagram with heat reservoir in the present invention；Wherein, pminRepresent thermoelectricity
Unit minimum generated output, p 'minRepresent corresponding thermoelectricity unit generated output, p during heat releasemaxRepresent thermoelectricity unit maximum generation work(
Rate, p 'maxRepresent corresponding thermoelectricity unit generated output during heat accumulation, δ p represents thermoelectricity unit electrical power difference, δ p ' expression is stored
Thermoelectricity unit generated output difference, h ' under heat condition-Represent the heat under exothermic conditions, h represents the heat initially drawing gas, h '+Table
Show the heat under the conditions of heat accumulation；
Fig. 3 is the schematic diagram of power load and wind power output characteristic in the present embodiment；Wherein, straight line represents electric load, short
Horizontal line represents equivalent electric load (20% wind-powered electricity generation), and point represents equivalent electric load (80% wind-powered electricity generation)；
Fig. 4 is under corresponding difference heat reservoir modes under different wind-powered electricity generation permeabilities under the conditions of 70mw heat demand in the present embodiment
Abandon wind situation schematic diagram；Wherein, white represents w/o heat accumulation mode, the light grey expression heat reservoir method of operation one, Dark grey
Represent the heat reservoir method of operation two, black represents the heat reservoir method of operation three；
Fig. 5 is corresponding difference heat reservoir modes under different wind-powered electricity generation permeabilities under the conditions of 140mw heat demand in the present embodiment
Under abandon wind situation schematic diagram；Wherein, white represents w/o heat accumulation mode, the light grey expression heat reservoir method of operation one, dark-grey
Color table shows the heat reservoir method of operation two, and black represents the heat reservoir method of operation three；
Fig. 6 be under the conditions of 140mw heat demand in the present embodiment different heat reservoir capacity to the signal abandoning wind improvement
Figure；Wherein, circle straight line represents 40% wind-powered electricity generation, and triangle straight line represents 60% wind-powered electricity generation, and rhombus straight line represents 80% wind-powered electricity generation, square
Shape straight line represents 100% wind-powered electricity generation.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
The present invention provides a kind of method that cogeneration units heat accumulation promotes wind electricity digestion, and it specifically comprises the following steps that
1) according to pre-setting the cogeneration units model with heat reservoir, heat reservoir capacity and wind-powered electricity generation infiltration are obtained
Rate；
2) according to thermic load constraint function, heat reservoir capacity constraint function and wind power output constraint function, obtain electric power
The objective optimization function of system minimum coal consumption amount is:
In formula, ci(pi,t,qi,t) it is cogeneration units coal consumption, cj(pj,t) it is simple generating set coal consumption.
3) the objective optimization function according to power system minimum coal consumption amount, using the broad sense reduced gradient algorithm of vba platform,
Obtain the minimum coal consumption value of power system；
4) according to the minimum coal consumption value of power system, heat reservoir capacity and wind-powered electricity generation permeability, using the broad sense of vba platform
Reduced gradient algorithm, obtains when thermic load is relatively low, and the heat reservoir method of operation one or the heat reservoir method of operation two can be effective
Reduce wind-powered electricity generation and abandon wind rate, when thermic load is higher, the heat reservoir method of operation three can effectively reduce abandons wind rate.
Above-mentioned steps 1) in, according to known electric load characteristic, wind-force power producing characteristics and thermic load characteristic, setting band heat accumulation
The cogeneration units model of system；Cogeneration units model with heat reservoir includes storing hot computation model, thermal balance
Computation model and thermoelectricity relation, store hot computation model hs,t+1For:
hs,t+1=hs,t-hi,t-hr,t(2)
In formula, hs,tRepresent the heat of t storage, hi,tRepresent t dispersed heat, for day circulation heat storage system
System, radiation loss is below 3%；hr,tRepresent the heat of t release；
Heat Balance Calculation model htFor:
ht=hr,t+hex,t(3)
In formula, hex,tThe heat that draws gas of cogeneration units steam turbine offer is provided；
The thermoelectricity relation of the cogeneration units with heat reservoir, as shown in Fig. 2 thermoelectricity unit maximum power generation pmax
Determined by the maximum and extraction flow of main steam flow, thermoelectricity unit minimum generated output pminBy main steam flow
The minima of little value, extraction flow and condensing flow determines.Under certain thermic load h, the peak modulation capacity of thermoelectricity unit is δ p
=pmax-pmin, by heat reservoir, according to the demand of power peak regulation, thermic load (h ' is decreased or increased-Or h '+), thus by machine
Group peak modulation capacity is expanded to δ p '=p 'max-p′min, when particularly wind-powered electricity generation is occurred frequently, power peak regulation is difficult, can be by cogeneration of heat and power machine
That organizes exerts oneself by pminReduce to p 'min, provide the useful space for wind electricity digestion.
Above-mentioned steps 2) in, the constraint function of load is:
In formula, qi,tFor cogeneration units heating load,For heat reservoir heating load, ηlFor heat reservoir efficiency, ht
Represent thermic load.
The constraint function of heat reservoir capacity is:
In formula,Represent heat reservoir quantity of heat storage,Represent heat reservoir maximum quantity of heat storage, ωebRepresent heat reservoir
Maximum capacity；
The constraint function of wind power output is:
0≤pj,t≤wj,t, t=1,2 ..., t, j ∈ ωwf(6)
In formula, pj,tRepresent that wind-powered electricity generation is actual to exert oneself, wj,tRepresent that wind-powered electricity generation theory is exerted oneself.
Carry out optimization to thermic load constraint function, heat reservoir capacity constraint function and wind power output constraint function to ask
Solution, the objective optimization function obtaining power system minimum coal consumption amount is:
Above-mentioned steps 4) in, when heat storage capacity is less than 10000m3, the increase of heat storage capacity can reduce abandons wind rate, and with
There is limit and successively decrease benefit in capacity increase；When heat storage capacity is more than 10000m3When, the increase of heat storage capacity has abandoned wind rate to reduction
Through significantly not acting on.
Above-mentioned steps 4) in, heat reservoir runs three kinds of modes, the heat reservoir method of operation one: section heat accumulation at ordinary times, paddy
Period heat release；The heat reservoir method of operation two: section and peak period heat accumulation at ordinary times, the heat release of paddy period；The heat reservoir method of operation three:
According to the dynamic heat accumulation of power system peak regulation demand and heat release.
Embodiment, electric load data during Beijing-Tianjin-Tangshan Grid in the December, 2014 being provided according to control centre, used
Electric load and wind power output characteristic, as shown in Figure 3.The area of heat-supply service providing in conjunction with North China regulation and control branch center and heating load, and
The mean daily temperature that China Meteorological board web provides, obtains the thermoelectricity relation of the cogeneration units containing heat reservoir.
The heat reservoir method of operation has a major impact to wind electricity digestion, compares three kinds of methods of operation, obtains as Fig. 4, Fig. 5
Analysis result: the heat reservoir method of operation one and the heat reservoir method of operation two are limited to the regulation performance of cogeneration units,
It is configured with heat reservoir and still suffers from abandoning wind, and the heat reservoir method of operation three can be by changing extraction flow flexible fortune
Market condition, therefore can reduce to greatest extent and abandon wind rate.
Promote wind electricity digestion to greatest extent, the capacity of heat reservoir is also important factor in order.Thermic load is 140mw's
Under the conditions of, to different heat reservoir capacity to abandoning wind improvement as shown in figure 5, under different wind-powered electricity generation permeabilities, abandoning wind rate
Increase with heat storage capacity is gradually lowered and diminishing marginal benefits, when heat storage capacity is more than 10000m3When, the increasing of heat storage capacity
Plus reduction is abandoned with wind rate significantly do not act on.
The various embodiments described above are merely to illustrate the present invention, and the structure of each part, size, set location and shape are all permissible
It is varied from, on the basis of technical solution of the present invention, all improvement individual part being carried out according to the principle of the invention and waiting
With converting, all should not exclude outside protection scope of the present invention.
Claims (9)
1. a kind of cogeneration units heat accumulation promotes the method for wind electricity digestion it is characterised in that it comprises the following steps:
1) according to pre-setting the cogeneration units model with heat reservoir, heat reservoir capacity and wind-powered electricity generation permeability are obtained；
2) according to thermic load constraint function, heat reservoir capacity constraint function and wind power output constraint function, obtain power system
The objective optimization function of minimum coal consumption amount；
3) the objective optimization function according to power system minimum coal consumption amount, using the broad sense reduced gradient algorithm of vba platform, obtains
The minimum coal consumption value of power system；
4) according to the minimum coal consumption value of power system, heat reservoir capacity and wind-powered electricity generation permeability, using vba platform broad sense both about
Gradient algorithm, obtains when thermic load is relatively low, and the heat reservoir method of operation one or the heat reservoir method of operation two can effectively reduce
Wind-powered electricity generation abandons wind rate；When thermic load is higher, the heat reservoir method of operation three can effectively reduce abandons wind rate.
2. as claimed in claim 1 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
Step 1) in, according to known electric load characteristic, wind-force power producing characteristics and thermic load characteristic, the setting connection of the thermoelectricity with heat reservoir
Produce unit model；Cogeneration units model with heat reservoir includes storing hot computation model, heat Balance Calculation model and heat
Electric relation.
3. as claimed in claim 2 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
Store hot computation model hs,t+1For:
hs,t+1=hs,t-hi,t-hr,t,
In formula: hs,tRepresent the heat of t storage, hi,tRepresent t dispersed heat, for day circulation heat storage system, dissipate
Heat loss is below 3%；hr,tRepresent the heat of t release.
4. as claimed in claim 2 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
Heat Balance Calculation model htFor:
ht=hr,t+hex,t,
In formula, hex,tThe heat that draws gas of cogeneration units steam turbine offer is provided.
5. as claimed in claim 2 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
The thermoelectricity relation of the cogeneration units with heat reservoir, thermoelectricity unit maximum power generation pmaxMaximum by main steam flow
Value and extraction flow determine, thermoelectricity unit minimum generated output pminBy the minima of main steam flow, extraction flow and solidifying
The minima of steam flow amount determines.
6. as claimed in claim 1 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
Step 2) in, the constraint function of load is:
In formula, qi,tFor cogeneration units heating load,For heat reservoir heating load, ηlFor heat reservoir efficiency, htRepresent heat
Load；
The constraint function of heat reservoir capacity is:
In formula,Represent heat reservoir quantity of heat storage,Represent heat reservoir maximum quantity of heat storage, ωebRepresent that heat reservoir is maximum
Capacity；
The constraint function of wind power output is:
0≤pj,t≤wj,t, t=1,2 ..., t, j ∈ ωwf,
In formula, pj,tRepresent that wind-powered electricity generation is actual to exert oneself, wj,tRepresent that wind-powered electricity generation theory is exerted oneself.
7. as claimed in claim 6 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: according to
Thermic load constraint function, heat reservoir capacity constraint function and wind power output constraint function, obtain power system minimum coal consumption amount
Objective optimization function be:
In formula, ci(pi,t,qi,t) it is cogeneration units coal consumption, cj(pj,t) it is simple generating set coal consumption.
8. as claimed in claim 1 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
The heat reservoir method of operation one is: section heat accumulation at ordinary times, the heat release of paddy period；The described heat reservoir method of operation two is: at ordinary times section and
Peak period heat accumulation, the heat release of paddy period；The described heat reservoir method of operation three is: according to the dynamic heat accumulation of power system peak regulation demand and
Heat release.
9. as claimed in claim 1 a kind of cogeneration units heat accumulation promote wind electricity digestion method it is characterised in that: described
Step 4) in, when heat storage capacity is less than 10000m3, the increase of heat storage capacity can reduce abandons wind rate, and increases presence with capacity
Successively decrease benefit in limit；When heat storage capacity is more than 10000m3When, wind rate is abandoned in the increase of heat storage capacity to reduction not to have been had significantly
Effect.
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| CN108711849A (en) * | 2018-06-01 | 2018-10-26 | 北京华建网源电力设计研究院有限公司 | Design method for thermoelectric unit configured with heat storage device |
| CN108711849B (en) * | 2018-06-01 | 2020-08-18 | 国网经济技术研究院有限公司 | Design method for thermoelectric unit configured with heat storage device |
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| CN109659958B (en) * | 2019-01-11 | 2022-05-06 | 国网辽宁省电力有限公司沈阳供电公司 | Power system and peak-load and frequency modulation method thereof |
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