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 PDF

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CN106356895A
CN106356895A CN201610936581.9A CN201610936581A CN106356895A CN 106356895 A CN106356895 A CN 106356895A CN 201610936581 A CN201610936581 A CN 201610936581A CN 106356895 A CN106356895 A CN 106356895A
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heat
wind
cogeneration units
heat reservoir
capacity
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CN106356895B (en
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田雪沁
徐彤
王新雷
颜静
宋崇明
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Beijing Huajian Network Source Electric Power Design Institute
State Grid Corp of China SGCC
State Grid Economic and Technological Research Institute
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Beijing Huajian Network Source Electric Power Design Institute
State Grid Corp of China SGCC
State Grid Economic and Technological Research Institute
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    • H02J3/386
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)

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

A kind of method that cogeneration units heat accumulation promotes wind electricity digestion
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:
σ i &element; ω c h p q i , t + ση l d l , t t e s = h t , t = 1 , 2 , ... t ,
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:
d l , t e b ≤ d &overbar; l e b , t = 1 , 2 ... t , l &element; ω e b ,
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:
min i m i z e σ t = 1 t σ i &element; ω c h p c i ( p i , t , q i , t ) + σ j &element; ω w f c j ( p j , t ) ,
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:
min i m i z e σ t = 1 t σ i &element; ω c h p c i ( p i , t , q i , t ) + σ j &element; ω w f c j ( p j , t ) - - - ( 1 )
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:
σ i &element; ω c h p q i , t + ση l d l , t t e s = h t , t = 1 , 2 , ... t - - - ( 4 )
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:
d l , t e b ≤ d &overbar; l e b , t = 1 , 2 ... t , l &element; ω e b - - - ( 5 )
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:
min i m i z e σ t = 1 t σ i &element; ω c h p c i ( p i , t , q i , t ) + σ j &element; ω w f c j ( p j , t ) - - - ( 7 )
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:
σ i &element; ω c h p q i , t + ση l d l , t t e s = h t , t = 1 , 2 , ... t ,
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:
d l , t e b ≤ d &overbar; l e b , t = 1 , 2 ... t , l &element; ω e b ,
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:
min i m i z e σ t = 1 t σ i &element; ω c h p c i ( p i , t , q i , t ) + σ j &element; ω w f c j ( p j , t ) ,
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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