CN103903068A  Greenhouse energy forecasting method based on hybrid optimization algorithm  Google Patents
Greenhouse energy forecasting method based on hybrid optimization algorithm Download PDFInfo
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 CN103903068A CN103903068A CN201410144270.XA CN201410144270A CN103903068A CN 103903068 A CN103903068 A CN 103903068A CN 201410144270 A CN201410144270 A CN 201410144270A CN 103903068 A CN103903068 A CN 103903068A
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 239000000428 dust Substances 0.000 description 1
 230000000694 effects Effects 0.000 description 1
 238000010921 indepth analysis Methods 0.000 description 1
 238000004519 manufacturing process Methods 0.000 description 1
 238000002310 reflectometry Methods 0.000 description 1
 230000011218 segmentation Effects 0.000 description 1
 238000010998 test method Methods 0.000 description 1
Abstract
The invention discloses a greenhouse energy forecasting method based on a hybrid optimization algorithm. The greenhouse forecasting method based on the hybrid optimization algorithm comprises the following steps that (1), a differential equation of temperature inside a greenhouse is set; (2), parameters are initialized; (3), a population is initialized, and the initial values of the parameters needing recognizing are generated randomly; (4), gen is made to be 1; (5), if gen is smaller than or equal to gens_max, the step (6) is carried out, and if gen is greater than gens_max, the step (15) is carried out; (6), k is made to be 1; (7), if k is smaller than or equal to max_k, the step (8) is carried out, or the step (10) is carried out; (8), a current optimal solution and a globally optimal solution are obtained; (9), k is made to be k+1, and the step (7) is carried out again; (10), pop_size grains are selected by utilization of a preferred function; (11), information of reserved M grains is used for regenerating a population of the GA; (12), the grains obtained in the step (11) are used for intersection and variation of the GA; (13), the pop_sizeM grains obtained by the GA and the reserved M grains of the PSO are combined to be pop_size new populations; (14), gen is made to be gen+1, and then the step (5) is carried out; (15), the minimum fitness function value and the parameters are output finally, and the forecast energy value of the greenhouse is output.
Description
Technical field
The invention belongs to agricultural greenhouse Environment Design and control technology field, be applicable to be difficult to set up the greenhouse energy predicting field of mathematical models.Specifically, relate to a kind of based on adaptive particle swarm optimization algorithm (
particle Swarm Optimization, hereinafter to be referred as
pSO) and genetic algorithm (
genetic Algorithm, hereinafter to be referred as
gA) the greenhouse energy predicting method of hybrid optimization algorithm.
Background technology
Industrialized agriculture is one of key industrial sector of modern agriculture, is the mark of a national agricultural development level, is the inevitable requirement of an agriculture featuring high yields, fine quality and high efficiency.The important content that hothouse production industry is produced as industrialized agriculture, causes people's common concern gradually.
Greenhouse is the complication system with nonlinear, randomness, strong coupling and the feature such as uncertain.The object of greenhouse modeling is mainly the needs that meet the aspects such as Greenhouse System emulation, design, prediction, control (optimization control and adaptive control) and decisionmaking.The main method of greenhouse modeling has two kinds of modelling by mechanism based on physical process and methods of testing.Modelling by mechanism based on physical process is to utilize unsteadystate heat transfer mass transfer to obtain describing the differential equation of greenhouse dynamic process, obtains environment dynamic model by solving the differential equation in the solution under certain boundary conditions.But in the time that physical parameter is more, some physical parameter wherein will be difficult to measure and some parameter can change according to the growth of houseplant.Therefore be difficult to set up energy mathematical model more accurately by the modelling by mechanism method of physical process completely.Method of testing refers to the mathematical model of utilizing information that inputoutput data provides to carry out process of establishing, also referred to as System Discrimination modeling.For very complicated system, it is more difficult setting up the mechanism model that each parameter has physical significance.So from experimental data, set up the model of input/output relation that can reflect system, although do not there is clear and definite physical significance, can be the Exact Design of system with control conduct with reference to foundation.
The present invention is the modeling method combining with System Discrimination modeling method according to modelling by mechanism, adopts
pSO
gAhybrid optimization algorithm carries out identification acquisition to being difficult to definite parameter in physical model.Greenhouse environment control system need to be according to the variation of greenhouse climate environment, controls topworks and regulates accordingly.When indoor air temperature is too low, need to utilize heating system heating; When indoor air temperature is too high, need to control the work such as ventilating opening, shading system, vent fan or evaporationcooled device, avoid overheated.Therefore, energy predicting method in greenhouse can be greenhouse design and controls provides theoretical reference.
Summary of the invention
In order to overcome existing greenhouse energy predicting method precision deficiency and consuming time of a specified duration, the invention provides a kind of greenhouse energy predicting method of the hybrid optimization algorithm based on selfadaptation PSO and GA.
The technical solution adopted for the present invention to solve the technical problems is:
A greenhouse energy predicting method for hybrid optimization algorithm, is characterized in that comprising the following steps:
Step 1: the differential equation of setting up warm indoor temperature:
（I）
In formula:
for the density of dry air,
for the volume in greenhouse,
for airborne thermal content,
,
be respectively the indoor and outdoor temperature in greenhouse,
for the surface area of chamber covering material,
for greenhouse surface area,
for outdoor radiosity,
for the total light transmittance of cladding material,
the energy providing for greenhouse heat source of heatsupply system,
for the emissivity between glass surface and air,
for
stefanBoltzmanconstant,
for sky temperature,
for the heat transfer coefficient of cladding material,
for thermal screen insulation correction factor,
for plant canopy leaf area index,
for the temperature of canopy leaf surface,
for boundary layer aerodynamics impedance,
being time series, is the adjacent seasonal effect in time series time interval;
Wherein, will
,
with
as the object of parameter adjustment identification;
Step 2: the initialization of parameter, comprises total number of particles
pop_size, preferentially function
threshold values
,
gAin initial crossingover rate
and aberration rate
, the scaleup factor of crossingover rate and aberration rate
cwith
m, maximum particle rapidity
v_max,
pSO_GAhybrid optimization algorithm is embedded
pSOthe population algebraically of algorithm
max_k,
pSO_GAthe population algebraically of hybrid optimization algorithm
gens_max;
Step 3: initialization population, generates even number particle composition population by population scale and constraint condition random
p (t); Meanwhile, the random parameter that needs identification that generates
,
with
initial value;
Step 4: order
gen=1, wherein
genthe algebraically of genetic manipulation;
Step 5: if
, perform step 6, otherwise exit to step 15;
Step 6: order
k=1, wherein
krepresent
pSO_GAhybrid optimization algorithm is embedded
pSOthe current population algebraically of algorithm;
Step 7: if
, perform step 8, otherwise execution step 10;
Step 8: algorithm is generated
,
,
use with interior extraneous greenhouse variable input
mATLABin software
sIMULINKthe Greenhouse model the inside that functional module is set up, obtains out current portion optimum solution and globally optimal solution; Then upgrade speed and the positional information of population according to formula II, III;
（II）
（III）
In formula:
iindividual particle is
kspeed in inferior Evolution of Population,
iindividual particle is
klocally optimal solution after inferior evolution,
globally optimal solution,
iindividual particle is
kposition in inferior evolution,
wconstraint,
with
respectively the study factor and the social factor,
with
it is the random number between [0,1];
Order
=
, then obtain their value according to formula IV:
（IV）
In formula: c is constant, and c>2;
Step 9: order
, return to step 7;
Step 10: will
pop_sizeindividual particle carries out arrangement from small to large by the value of fitness function, then utilizes the preferentially function of formula V to select: if the value of the fitness function of some particles
j (i)be more than or equal to selected threshold values, this particle is bad class particle, gives up; If the value of the fitness function of some particles
j (i)be less than selected threshold values, this particle is excellent class particle, retains; Finally can obtain
mthe particle of individual fitness function value in selected threshold values;
（V）
In formula:
represent the
ithe preferentially function of individual particle,
j (i)represent the
ithe value of the fitness function of individual particle,
represent selected threshold values;
Step 11: by what retain
mthe information of individual particle is brought formula VI into and is regenerated
gApopulation;
（VI）
In formula:
ithe selecteed possibility of individual particle,
ithe value of the fitness function of individual particle,
mthe size of population,
be all particles in population fitness function value and; Wherein fitness function can represent with formula VII;
（VII）
tindividual time series
ithe output energy of individual calculating particles,
tthe output energy of individual time series experiment actual measurement,
nfor seasonal effect in time series maximal value;
Step 12: will
with
bring formula VIII and IX into, obtain crossingover rate and aberration rate now:
（VIII）
（IX）
In formula:
genthe algebraically of genetic manipulation,
gens_maxbe
pSO_GAthe population algebraically of hybrid optimization algorithm maximum,
with
respectively initial crossingover rate and aberration rate,
cwith
mbe respectively the scaleup factor of crossingover rate and aberration rate,
with
respectively
genthe crossingover rate in generation and aberration rate;
Then the particle, step 11 being obtained for
gAcrossover and mutation;
Step 13: will
gAobtain
pop_sizeMindividual particle and
pSOretain
mindividual particle is combined into number
pop_sizenew population;
Step 14: order
, execution step 5;
Step 15: finally export the parameter that needs identification in minimum fitness function value and model
,
with
,and the energy value of greenhouse prediction.
Superiority of the present invention is mainly manifested in:
1. selfadaptation
pSOGAhybrid optimization algorithm has fast convergence rate, more easily tends to the feature of globally optimal solution;
2. based on selfadaptation
pSOGAthe greenhouse energy predicting method of hybrid optimization algorithm is more accurate and still less consuming time aspect greenhouse energy predicting.
brief description of the drawings
Be further described in detail below in conjunction with accompanying drawing and embodiments of the present invention.
Fig. 1 is greenhouse energy predicting procedure figure.
Fig. 2 is based on selfadaptation
pSOGAthe greenhouse energy predicting method flow diagram of hybrid optimization algorithm.
Fig. 3 is greenhouse energy predicting graph curve.
Embodiment
With reference to Fig. 1, in the present embodiment, greenhouse is to connect a glasshouse, employing nanometer antimonydoped stannic oxide (
aTO) glass of film, to reduce the heat interchange inside and outside greenhouse, play good energysaving effect.It is high that unlatching at night in winter has reflectivity, and the aluminium foil thermal screen that emissivity is low reduces thermal loss.Inside greenhouse adopts fan coil and lowtemperature hot water floor radiation heating system as the end heating plant in greenhouse, adopts the medium of circulating hot water as heat transport.The present embodiment carries out energy predicting by following steps:
Step 1: according to radiant heat exchange, heat conduction energy exchange, massand heattransfer energy exchange and crop latent heat and Exchange of apparent heat etc., set up the differential equation of greenhouse indoor temperature.And according to the differential equation, adopt highorder Runge Kutta method for solving to change into the energy equation of greenhouse.The energy equation of greenhouse can represent that independent variable is solar radiation
solar, outdoor temperature
and humidity
relevant, and the heat transfer coefficient of greenhouse geometrical structure parameter, cladding material
, thermal screen insulation correction factor
, be plant canopy leaf area index
relevant expression formulas such as (leaf area/surface areas).Greenhouse selfenergy predictive equation can be expressed as:
(I)
Wherein,
be 1.2
;
be 64512
;
be 1008
; Inside and outside, greenhouse temperature
,
collected by temperature sensor;
for the surface area of chamber covering material, value is 11470
;
for greenhouse surface area, value is 8064
;
for outdoor radiosity, can be obtained by weather station sensor collection;
for the total light transmittance of cladding material, value is 0.75;
the energy (the energy difference that different greenhouse heating systems provides) providing for greenhouse heat source of heatsupply system,
for the emissivity between glass surface and air, numerical value is 0.82,
for
stefanBoltzmanconstant
,
for sky temperature, can pass through 183+0.34 (
+ 273) calculate and obtain;
for the heat transfer coefficient of cladding material;
for thermal screen insulation correction factor;
for plant canopy leaf area index;
for the temperature of canopy leaf surface, the indoor temperature before available 1 hour substitutes;
for boundary layer aerodynamics impedance, value is 290
;
tbe time series, each seasonal effect in time series interval time is 5 minutes;
Wherein, greenhouse geometrical structure parameter can be determined and can calculate according to greenhouse structure, outdoor solar radiation
solar,outdoor temperature
and outside humidity
can be obtained by the collection of outdoor weather station, and
,
with
difficult parameters, to measure, and can change along with the situation such as dust and plant growth on cladding material, therefore
,
with
as the object of parameter adjustment identification;
Step 2: the initialization of parameter, comprises total number of particles
pop_size=20, preferentially function
threshold values
=250000,
gAin initial crossover and mutation probability
=0.6 He
=0.01, the scaleup factor of crossingover rate and aberration rate
c=0.5with
m=0.005, maximum particle rapidity
v_max=7,
pSO_GAhybrid optimization algorithm is embedded
pSOthe population algebraically of algorithm
max_k=10,
pSO_GAthe population algebraically of hybrid optimization algorithm
gens_max=10;
Step 3: initialization population, generates even number particle composition population by population scale and constraint condition random
p (t).Meanwhile, the random parameter that needs identification that generates
,
with
initial value, wherein
for the random number between [3,6],
for the random number between [0.5,1],
for the random number between [4,8];
Step 4: order
gen=1, wherein
genthe algebraically of genetic manipulation;
Step 5: if
, perform step 6, otherwise exit to step 15;
Step 6: order
k=1, wherein
krepresent
pSO_GAhybrid optimization algorithm is embedded
pSOthe current population algebraically of algorithm;
Step 7: if
, perform step 8, otherwise execution step 10;
Step 8: algorithm is generated
,
,
use with interior extraneous greenhouse variable input
mATLABin software
sIMULINKthe Greenhouse model the inside that functional module is set up, draws locally optimal solution and globally optimal solution; Then upgrade speed and the positional information of population according to formula II, III;
（II）
（III）
In formula:
iindividual particle is
kspeed in inferior Evolution of Population,
iindividual particle is
klocally optimal solution after inferior evolution,
globally optimal solution,
iindividual particle is
kposition in inferior evolution,
wbe constraint, it can ensure
pSOsearch in algorithm can finally be tending towards certain a bit,
with
respectively the study factor and the social factor,
with
it is the random number between [0,1];
Order
=
, then obtain their value according to formula IV:
（IV）
In formula: c is constant, and c>2;
Step 9: order
, return to step 7;
Step 10: will
pop_sizeindividual particle carries out arrangement from small to large by the value of fitness function, then utilizes the preferentially function of formula V to select: if the value of the fitness function of some particles
j (i)be more than or equal to selected threshold values, this particle is bad class particle, gives up; If the value of the fitness function of some particles
j (i)be less than selected threshold values, this particle is excellent class particle, retains; Finally can obtain
mthe particle of individual fitness function value in selected threshold values;
（V）
In formula:
represent the
ithe preferentially function of individual particle,
j (i)represent the
ithe value of the fitness function of individual particle,
represent selected threshold values;
Step 11: by what retain
mthe information of individual particle is brought formula VI into and is regenerated
gApopulation; Here we define
mthe selecteed possibility of particle that in individual particle, the value of fitness function is large is large, and the reason of doing is like this that this class particle is " the bad class particle " of the excellent class particle the inside of definition in step 10, and we wish that these particles are more chosen and carry out
gAoperation, prevents that algorithm is absorbed in local optimum convergence;
（VI）
In formula:
ithe selecteed possibility of individual particle,
ithe value of the fitness function of individual particle,
mthe size of population,
be all particles in population fitness function value and; Wherein fitness function can represent with formula VII;
（VII）
tindividual time series
ithe output energy of individual calculating particles,
tthe output energy of individual time series experiment actual measurement,
nfor seasonal effect in time series maximal value;
Step 12: will
with
bring formula VIII and IX into, obtain crossingover rate and aberration rate now:
（VIII）
（IX）
In formula:
genthe algebraically of genetic manipulation,
gens_maxbe
pSO_GAthe population algebraically of hybrid optimization algorithm maximum,
with
respectively initial crossingover rate and aberration rate,
cwith
mbe respectively the scaleup factor of crossingover rate and aberration rate,
with
respectively
genthe crossingover rate in generation and aberration rate;
Then the particle that, we obtain step 11 for
gAcrossover and mutation;
Step 13: will
gAobtain
pop_sizeMindividual particle and
pSOretain
mindividual particle is combined into number
pop_sizenew population;
Step 14: order
, execution step 5;
Step 15: finally export minimum fitness function value and be 180000 and model in need the parameter of identification
,
with
respectively 4.5,0.6,5.8, wherein
the heat transfer coefficient of cladding material,
thermal screen insulation correction factor,
plant canopy leaf area index, i.e. leaf area/surface area.
The present embodiment conducts indepth analysis in the combination thought of particle cluster algorithm and genetic algorithm and combination, and around population selfadaptation segmentation strategy, crossover operator is chosen and the probability parameter selection that makes a variation etc. is optimized algorithm design.By introduce the crossover operator of genetic algorithm in particle cluster algorithm, make paired particle can intercourse information, so that particle has had to the ability of new search volume flight.The mutation operator of introducing genetic algorithm in particle cluster algorithm strengthens particle cluster algorithm and jumps out local ability.By case verification new
gAPSOthe global convergence of hybrid optimization algorithm.Sample result shows selfadaptation
gAPSOhybrid optimization algorithm has possessed good ability of searching optimum, has also had stronger local search ability simultaneously.Can obtain faster greenhouse energy predicting value, and contrast actual value, value and the actual value of algorithm identification are more or less the same.
What more than enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can also directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (1)
1. a greenhouse energy predicting method for hybrid optimization algorithm, is characterized in that comprising the following steps:
Step 1: the differential equation of setting up warm indoor temperature:
（I）
In formula:
for the density of dry air,
for the volume in greenhouse,
for airborne thermal content,
,
be respectively the indoor and outdoor temperature in greenhouse,
for the surface area of chamber covering material,
for greenhouse surface area,
for outdoor radiosity,
for the total light transmittance of cladding material,
the energy providing for greenhouse heat source of heatsupply system,
for the emissivity between glass surface and air,
for
stefanBoltzmanconstant,
for sky temperature,
for the heat transfer coefficient of cladding material,
for thermal screen insulation correction factor,
for plant canopy leaf area index,
for the temperature of canopy leaf surface,
for boundary layer aerodynamics impedance,
being time series, is the adjacent seasonal effect in time series time interval;
Wherein, will
,
with
as the object of parameter adjustment identification;
Step 2: the initialization of parameter, comprises total number of particles
pop_size, preferentially function
threshold values
,
gAin initial crossingover rate
and aberration rate
, the scaleup factor of crossingover rate and aberration rate
cwith
m, maximum particle rapidity
v_max,
pSO_GAhybrid optimization algorithm is embedded
pSOthe population algebraically of algorithm
max_k,
pSO_GAthe population algebraically of hybrid optimization algorithm
gens_max;
Step 3: initialization population, generates even number particle composition population by population scale and constraint condition random
p (t); Meanwhile, the random parameter that needs identification that generates
,
with
initial value;
Step 4: order
gen=1, wherein
genthe algebraically of genetic manipulation;
Step 5: if
, perform step 6, otherwise exit to step 15;
Step 6: order
k=1, wherein
krepresent
pSO_GAhybrid optimization algorithm is embedded
pSOthe current population algebraically of algorithm;
Step 7: if
, perform step 8, otherwise execution step 10;
Step 8: algorithm is generated
,
,
use with interior extraneous greenhouse variable input
mATLABin software
sIMULINKthe Greenhouse model the inside that functional module is set up, obtains out current portion optimum solution and globally optimal solution; Then upgrade speed and the positional information of population according to formula II, III;
（II）
（III）
In formula:
iindividual particle is
kspeed in inferior Evolution of Population,
iindividual particle is
klocally optimal solution after inferior evolution,
globally optimal solution,
iindividual particle is
kposition in inferior evolution,
wconstraint,
with
respectively the study factor and the social factor,
with
it is the random number between [0,1];
Order
=
, then obtain their value according to formula IV:
（IV）
In formula: c is constant, and c>2;
Step 9: order
, return to step 7;
Step 10: will
pop_sizeindividual particle carries out arrangement from small to large by the value of fitness function, then utilizes the preferentially function of formula V to select: if the value of the fitness function of some particles
j (i)be more than or equal to selected threshold values, this particle is bad class particle, gives up; If the value of the fitness function of some particles
j (i)be less than selected threshold values, this particle is excellent class particle, retains; Finally can obtain
mthe particle of individual fitness function value in selected threshold values;
（V）
In formula:
represent the
ithe preferentially function of individual particle,
j (i)represent the
ithe value of the fitness function of individual particle,
represent selected threshold values;
Step 11: by what retain
mthe information of individual particle is brought formula VI into and is regenerated
gApopulation;
（VI）
In formula:
ithe selecteed possibility of individual particle,
ithe value of the fitness function of individual particle,
mthe size of population,
be all particles in population fitness function value and; Wherein fitness function can represent with formula VII;
（VII）
tindividual time series
ithe output energy of individual calculating particles,
tthe output energy of individual time series experiment actual measurement,
nfor seasonal effect in time series maximal value;
Step 12: will
with
bring formula VIII and IX into, obtain crossingover rate and aberration rate now:
（VIII）
（IX）
In formula:
genthe algebraically of genetic manipulation,
gens_maxbe
pSO_GAthe population algebraically of hybrid optimization algorithm maximum,
with
respectively initial crossingover rate and aberration rate,
cwith
mbe respectively the scaleup factor of crossingover rate and aberration rate,
with
respectively
genthe crossingover rate in generation and aberration rate;
Then the particle, step 11 being obtained for
gAcrossover and mutation;
Step 13: will
gAobtain
pop_sizeMindividual particle and
pSOretain
mindividual particle is combined into number
pop_sizenew population;
Step 14: order
, execution step 5;
Step 15: finally export the parameter that needs identification in minimum fitness function value and model
,
with
,and the energy value of greenhouse prediction.
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JP2010051190A (en) *  20080826  20100311  Ehime Univ  Apparatus and method for cooling local area of cultivated plant 
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CN102736596A (en) *  20120611  20121017  南京农业大学  Multiscale greenhouse environment control system based on crop information fusion 
CN202694113U (en) *  20120629  20130123  南京农业大学  Greenhouse environmental control system fused with crop information 
CN103105246A (en) *  20121231  20130515  北京京鹏环球科技股份有限公司  Greenhouse environment forecasting feedback method of back propagation (BP) neural network based on improvement of genetic algorithm 
CN103235620A (en) *  20130419  20130807  河北农业大学  Greenhouse environment intelligent control method based on global variable prediction model 

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JP2010051190A (en) *  20080826  20100311  Ehime Univ  Apparatus and method for cooling local area of cultivated plant 
CA2691228A1 (en) *  20100127  20110727  Trido Industries Inc.  Control system for a chemical injection pump 
CN102736596A (en) *  20120611  20121017  南京农业大学  Multiscale greenhouse environment control system based on crop information fusion 
CN202694113U (en) *  20120629  20130123  南京农业大学  Greenhouse environmental control system fused with crop information 
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CN107067035A (en) *  20170417  20170818  哈尔滨师范大学  The SVMs Study on wetland remote sensing method of coevolution algorithm optimization 
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CN107545100A (en) *  20170731  20180105  江苏大学  A kind of highresolution Reduced Modeling Methods of venlo types greenhouse 
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