CN109901637A - A kind of thermoelectricity plants the green house control method of three coproduction - Google Patents
A kind of thermoelectricity plants the green house control method of three coproduction Download PDFInfo
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- CN109901637A CN109901637A CN201910271185.2A CN201910271185A CN109901637A CN 109901637 A CN109901637 A CN 109901637A CN 201910271185 A CN201910271185 A CN 201910271185A CN 109901637 A CN109901637 A CN 109901637A
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Abstract
A kind of thermoelectricity disclosed by the invention plants the green house control method of three coproduction, including following steps: one, establishing system model, system model includes three parts: a greenhouse, an energy source router (EH) and a water tank；It wherein include a co-generator, a gas fired-boiler in EH, E indicates electric energy, and heat flow indicates that CO2 is indicated with X with H；Two, the heat S of storage is ignored other state variables as being unique state variable.Green house control method of the invention instructs Instantaneous Control decision by the virtual value of the heat of storage, and virtual value carries out heuristic adjustment, to reduce the water tank invalid time to the maximum extent.
Description
Technical field
The present invention relates to multiple-energy-sources to comprehensively utilize optimizing resource allocation field, plants three in particular to a kind of thermoelectricity
The green house control method of production.
Background technique
In recent years, the distributed energy resource system that co-generation unit is quickly grown in the world, especially in winter, thermoelectricity connection
Widely paid attention in countries in the world in the greenhouse of production.This components of system as directed electric power is transported to power grid, most of heat and dioxy
Change carbon for improving environment in greenhouse.Water tank stores the additional heat generated daytime, and winter is used for night greenhouse heating, and summer is used
It radiates in night.Cogeneration of heat and power Greenhouse System is also a main aspect of distributed energy resource system, this kind of system mainly exists
It is developed on the basis of co-generation unit, pollutant emission can be reduced, green plants greenhouse is combined into entire system
In system, under the premise of realizing energy utilization, it is further reduced the discharge of pollutant.Co-generation system can mutually be tied with greenhouse
It closes, a large amount of carbon compounds and a large amount of vapor that co-generation system generates further are absorbed and utilized for plant, co-generation system row
Exhaust gas out still has very high temperature, can be used for greenhouse Winter protection, saves Greenhouse Heating expense.However how to control this system
Achieve the effect that one it is optimal be a problem.
Summary of the invention
In view of the deficiencies of the prior art, main mesh of the invention is in the green house control for providing a kind of thermoelectricity and planting three coproduction
Method instructs Instantaneous Control decision by the virtual value of the heat of storage, and virtual value carries out heuristic adjustment, with to greatest extent
Reduce the water tank invalid time in ground.
Purpose to realize the present invention, the technical solution of use are as follows:
A kind of thermoelectricity plants the green house control method of three coproduction, comprising the following steps:
One, system model is established, system model includes three parts: a greenhouse, an energy source router (EH) and one
A water tank；It wherein include a co-generator, a gas fired-boiler in EH, E indicates electric energy, and heat flow is indicated with H,
CO2 is indicated with X；
Two, the heat S of storage is ignored other state variables as being unique state variable；
Three, following balanced type is obtained by step 1 and step 2:
Water tank thermal balance: ds/dt=Hs (1)
Greenhouse energy balance: HG+HF-HT=0 (2)
Greenhouse CO2 balance: the carbon dioxide (3) of XC-XV-G=0, G expression plant consumption
The hot node balance in four tunnels: HC+HB-HS-HG=0 (4)
Three road CO2 node balances: XC+XB-XG=0 (5)
Preferably, heat and electricity that cogeneration of heat and power generates are linked to each other, obtain following procedure equilibrium equation:
EC=ηHEHC (6)
The energy (heat and electricity) that cogeneration of heat and power generates is connected with the carbon dioxide generated, show that following procedure balances
Equation:
XC=η(H+E)X(HC+EC) (7)
Heat and carbon dioxide that boiler generates are connected, obtain following procedure equilibrium equation:
XB=ηHXHB (8)
Wherein η refers to efficiency.
Preferably, constraint condition in such a system are as follows:
0≤HB≤HBC (9)
0≤HC≤HCc (10)
-HSc≤Hs≤HSc (11)
Preferably, plant is in stable state, the speed of growth are as follows:
G ≡ N+Y=(P-R) f { M } (12)
Wherein G, N and Y are the speed of growth, not vendible material and the vendible plant of entire plant respectively.
Preferably, above-mentioned Y is assumed proportional to G, and f { M } is sunshine leaf area index, and P is gross photosynthesis rate,
R is total respiratory rate.Gross photosynthesis R may be expressed as:
P{Li,Ci,Ti}=p { Li,Ci,}q{Ti} (13)
Wherein p { Li,Ci, indicate optimum temperature under gross photosynthesis rate, q { TiIndicate photosynthesis to best temperature
The reaction of the deviation of degree.
q{Ti}=1-k (Ti-Tp)2 (15)
Wherein ηLXIt is photosynthetic efficiency, σ is the conductance to CO2, and Tp is photosynthetic optimum air temperature, and k is one
Constant.
Preferably, given system and weather parameters value are controlled with the function optimization of time:
J=∫ [(UE{t}EC+uYY)-(uQQ+uCHc+uBHB)]dt (16)
Wherein J is the performance standard of Greenhouse System, UE{ t } is the unit value of electric power, uYIt is the unit value that can harvest plant, Y
For the amount that can harvest plant, Q is ventilation rate.
Preferably, the virtual value Λ of the heat of storage enters decision process by Hamiltonian function, and M indicates Greenhouse System
The increment (heat including storage) of value as a whole:
M=UE{t}EC+uYY-uQQ-uCHc-uBHB)+ΛHS (17)
Preferably, control process is by maximizing Hamilton letter with the value of Λ in each time step (true or simulation)
Number is to obtain；When the heat of storage does not cross the border, is searched for by five dimensions to Q, Hb, Hc, Hs and Ts, realize that H is maximized.Then
Greenhouse indoor environment, and the increment of growth and accumulation of heat are assessed using optimal control inputs；In this case, Λ is at any time
Variation and change, when water tank be it is empty or when having expired, Hs is known as zero, and Hamiltonian function is unrelated with Λ, searches for as four-dimensional Q, Hb, Hc
And Ts；Here enter heuristic rule: when amount of storage is at the upper bound, each time step can be reduced slightly, be emptied with increasing
The ability of water tank, otherwise in lower limit, S=0.
The beneficial effects of the present invention are: since the demand in season to heat and carbon dioxide constantly changes, it is this common
State changes with time, and winter is greater than summer.When water tank is empty, it is gradually increased, and is gradually subtracted when water tank is full
It is few.Changing its value is in order to rationalize amount of storage, to reduce the time of water tank free time to the maximum extent.According to statistics, this control
Method processed is able to achieve 25% gain.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the system model figure for the green house control method that a kind of thermoelectricity provided in an embodiment of the present invention plants three coproduction；
Fig. 2 is the flow chart for the green house control method that a kind of thermoelectricity provided in an embodiment of the present invention plants three coproduction；
Fig. 3 is the MATLAB system emulation for the green house control method that a kind of thermoelectricity provided in an embodiment of the present invention plants three coproduction
Result figure.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Below in conjunction with specific embodiment, technical scheme in the embodiment of the invention is clearly and completely described, shows
So, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
A kind of thermoelectricity provided in the embodiment of the present invention plants the green house control method of three coproduction, comprising the following steps:
One, system model is established, referring to Fig.1, system model includes three parts: a greenhouse, an energy source router
(EH) and a water tank；It wherein include a co-generator, a gas fired-boiler in EH, E indicates electric energy, heat flow
It is indicated with H, CO2 is indicated with X；
Two, the heat S of storage is ignored other state variables as being unique state variable；
Three, following balanced type is obtained by step 1 and step 2:
Water tank thermal balance: ds/dt=Hs (1)
Greenhouse energy balance: HG+HF-HT=0 (2)
Greenhouse CO2 balance: XC-XVThe carbon dioxide (3) of-G=0, G expression plant consumption
The hot node balance in four tunnels: HC+HB-HS-HG=0 (4)
Three road CO2 node balances: XC+XB-XG=0 (5)
Further, heat and electricity that cogeneration of heat and power generates are linked to each other, obtain following procedure equilibrium equation:
EC=ηHEHC (6)
The energy (heat and electricity) that cogeneration of heat and power generates is connected with the carbon dioxide generated, show that following procedure balances
Equation:
XC=η(H+E)X(HC+EC) (7)
Heat and carbon dioxide that boiler generates are connected, obtain following procedure equilibrium equation:
XB=ηHXHB (8)
Wherein η refers to efficiency.
In the present embodiment, the constraint condition in this system are as follows:
0≤HB≤HBC (9)
0≤HC≤HCc (10)
-HSc≤Hs≤HSc (11)
Further, plant is in stable state, the speed of growth are as follows:
G ≡ N+Y=(P-R) f { M } (12)
Wherein G, N and Y are the speed of growth, not vendible material and the vendible plant of entire plant respectively.Y is false
It is set to proportional to G, f { M } is sunshine leaf area index, and P is gross photosynthesis rate, and R is total respiratory rate.Gross photosynthesis
R may be expressed as:
P{Li,Ci,Ti}=p { Li,Ci,}q{Ti} (13)
Wherein p { Li,Ci, indicate optimum temperature under gross photosynthesis rate, q { TiIndicate photosynthesis to best temperature
The reaction of the deviation of degree.
q{Ti}=1-k (Ti-Tp)2 (15)
Wherein ηLXIt is photosynthetic efficiency, σ is the conductance to CO2, and Tp is photosynthetic optimum air temperature, and k is one
Constant.
Preferably, given system and weather parameters value are controlled with the function optimization of time:
J=∫ [(UE{t}EC+uYY)-(uQQ+uCHc+uBHB)]dt (16)
Wherein J is the performance standard of Greenhouse System, be according to vendible electric power in regular period (being here 1 year) and
The value of vendible plant subtracts into (not the considering capital and cost of labor) measured originally；
UE{ t } is the unit value of electric power, uYIt is the unit value that can harvest plant, Y is the amount that can harvest plant, and Q is ventilation
Rate.
Optionally, the virtual value Λ of the heat of storage enters decision process by Hamiltonian function, and M indicates Greenhouse System
The increment (heat including storage) of value as a whole:
M=UE{t}EC+uYY-uQQ-uCHc-uBHB)+ΛHS (17)
Further, referring to Fig. 2, control process is by maximum with the value of Λ in each time step (true or simulation)
Change Hamiltonian function to obtain.When the heat of storage does not cross the border, is searched for by five dimensions to Q, Hb, Hc, Hs and Ts, realize H
It maximizes.Then greenhouse indoor environment, and the increment of growth and accumulation of heat are assessed using optimal control inputs.In such case
Under, Λ is changed over time and is changed, and when water tank is empty or when having expired, Hs is known as zero, and Hamiltonian function is unrelated with Λ, is searched for and is
Four-dimensional Q, Hb, Hc and Ts.Here enter heuristic rule: when amount of storage is at the upper bound, each time step can be reduced slightly,
To increase the ability of Clean water tank empty, otherwise in lower limit, S=0.
Referring to Fig. 3, it was found from the simulation result of MATLAB: indoor temperature control system temperature is controlled at 10-35 ° of temperature
C range, in reasonable range.
Once establishing the process of operation optimization, so that it may be used during the best size of search system component
It.Accomplish this point, it must be understood that the capital cost of device (cogeneration of heat and power, boiler, water tank), the function as its size.
Under normal conditions, bigger installed capacity can improve operating characteristics, but this improvement must be with the increase phase of system capital cost
Tradeoff.Annual capital cost k, the standard that can earn a profit J are subtracted from annual operation standarddes:
Jdes=J-k (18)
Available data shows that cost of equipment can be with the approximate linear function of capacity.Thus it is contemplated that arriving certain rate of descent
(i.e. certain payoff period), certain interest rate and certain maintenance cost, Nian Chengben k can be indicated are as follows:
KC=(CHCc+C)ωC (19)
KB=(BHBc+B)ωB (20)
KS=(SSC+S)ωS (21)
KTS=(TS)ωTS (22)
Its neutralize be linear cost of investment function coefficient, subscript C, B, S and TS indicate cogeneration of heat and power, boiler, water tank and
The coefficient of heat shielding.Therefore, the statement in bracket is the purchase cost of unit greenhouse surface area equipment.ω is specific return rate,
Including depreciation, interest and maintenance cost.For any selected size combinations, total capital cost are as follows:
K=KC+KB+KS+KTS (23)
Table 1 lists the monthly unit income in standard time.These incomes are related with plant and electricity.It is sold to the electricity of power grid
Power takes in the expense of cogeneration of heat and power using gas of can not paying, i.e. cogeneration of heat and power itself and uneconomical.Plant income from sales and electricity
Power income reaches peak in May and June.Consider the synergistic effect between two systems, it is obvious to generate income, therefore have very high
Economic value.
Table 1
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (8)
1. a kind of green house control method that thermoelectricity plants three coproduction, which comprises the following steps:
One, system model is established, system model includes three parts: a greenhouse, an energy source router (EH) and a water
Case；It wherein include a co-generator, a gas fired-boiler in EH, E indicates electric energy, and heat flow is indicated with H, CO2 X
It indicates；
Two, the heat S of storage is ignored other state variables as being unique state variable；
Three, following balanced type is obtained by step 1 and step 2:
Water tank thermal balance: ds/dt=Hs (1)
Greenhouse energy balance: HG+HF-HT=0 (2)
Greenhouse CO2 balance: XC-XVThe carbon dioxide (3) of-G=0, G expression plant consumption
The hot node balance in four tunnels: HC+HB-HS-HG=0 (4)
Three road CO2 node balances: XC+XB-XG=0 (5)
2. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that by cogeneration of heat and power
The heat and electricity of generation are linked to each other, and obtain following procedure equilibrium equation:
EC=ηHEHC (6)
The energy (heat and electricity) that cogeneration of heat and power generates is connected with the carbon dioxide generated, obtains following procedure equilibrium equation
Formula:
XC=η(H+E)X(HC+EC) (7)
Heat and carbon dioxide that boiler generates are connected, obtain following procedure equilibrium equation:
XB=ηHXHB (8)
Wherein η refers to efficiency.
3. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that in above system
In constraint condition are as follows:
0≤HB≤HBC (9)
0≤HC≤HCc (10)
-HSc≤Hs≤HSc (11)
4. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that plant is in steady
Fixed state, the speed of growth are as follows:
G ≡ N+Y=(P-R) f { M } (12)
Wherein G, N and Y are the speed of growth, not vendible material and the vendible plant of entire plant respectively.
5. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that above-mentioned Y is false
It is set to proportional to G, f { M } is sunshine leaf area index, and P is gross photosynthesis rate, and R is total respiratory rate；Gross photosynthesis
R may be expressed as:
P{Li,Ci,Ti}=p { Li,Ci,}q{Ti} (13)
Wherein p { Li,Ci, indicate optimum temperature under gross photosynthesis rate, q { TiIndicate photosynthesis to optimum temperature
The reaction of deviation.
q{Ti}=1-k (Ti-Tp)2 (15)
Wherein ηLXIt is photosynthetic efficiency, σ is the conductance to CO2, and Tp is photosynthetic optimum air temperature, and k is a constant.
6. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that given system and
Weather parameters value is controlled with the function optimization of time:
J=∫ [(UE{t}EC+uYY)-(uQQ+uCHc+uBHB)]dt (16)
Wherein J is the performance standard of Greenhouse System, UE{ t } is the unit value of electric power, uYIt is the unit value that can harvest plant, Y is can
The amount of plant is harvested, Q is ventilation rate.
7. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that the heat of storage
Virtual value Λ, decision process is entered by Hamiltonian function, M indicates the increment of the value of Greenhouse System as a whole
(heat including storage):
M=UE{t}EC+uYY-uQQ-uCHc-uBHB)+ΛHS (17)
8. the green house control method that a kind of thermoelectricity according to claim 1 plants three coproduction, which is characterized in that control process is
By being obtained in each time step (true or simulation) with the value of Λ maximization Hamiltonian function；When the heat of storage is not got over
When boundary, is searched for by five dimensions to Q, Hb, Hc, Hs and Ts, realize that H is maximized；Then temperature is assessed using optimal control inputs
Room indoor environment, and the increment of growth and accumulation of heat.In this case, Λ is changed over time and is changed, when water tank be it is empty or
When having expired, Hs is known as zero, and Hamiltonian function is unrelated with Λ, searches for as four-dimensional Q, Hb, Hc and Ts；Here enter heuristic rule
Then: when amount of storage is at the upper bound, each time step can be reduced slightly, to increase the ability of Clean water tank empty, otherwise under
In limited time, S=0.
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| CN109255489A (en) * | 2018-09-27 | 2019-01-22 | 河海大学 | A kind of electric-thermal interconnection integrated energy system likelihood energy flow calculation methodologies based on Cumulants method |
| CN109472050A (en) * | 2018-09-30 | 2019-03-15 | 东南大学 | Co-generation unit incorporation time scale dispatching method based on thermal inertia |
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6446385B1 (en) * | 2001-06-12 | 2002-09-10 | William C. Crutcher | Greenhouse system with co-generation power supply, heating and exhaust gas fertilization |
| JP2006017340A (en) * | 2004-06-30 | 2006-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | Cogeneration plant and its operating method |
| US20120102950A1 (en) * | 2010-11-02 | 2012-05-03 | Alliance For Sustainable Energy, Llc. | Solar thermal power plant with the integration of an aeroderivative turbine |
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