CN106447231A - Method of calculating the time without shielding of shadow for photovoltaic assembly for photovoltaic power generation project - Google Patents
Method of calculating the time without shielding of shadow for photovoltaic assembly for photovoltaic power generation project Download PDFInfo
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Abstract
The invention discloses a method of calculating the time without shielding of shadow for a photovoltaic assembly for a photovoltaic power generation project. For the method of calculating the time without shielding of shadow for a photovoltaic assembly for a photovoltaic power generation project, after knowing about the parameters, such as the latitude of the location of a photovoltaic power station, the length of a battery assembly, the separation distance of the battery assembly, the inclination angle of the battery assembly, and the mountainous region gradient inclination angle, the time without shielding of shadow for a photovoltaic assembly can be acquired under the layout scheme condition. The method of calculating the time without shielding of shadow for a photovoltaic assembly for a photovoltaic power generation project has the advantages of being accurate in calculation, being able to provide important parameters for comprehensive analysis of the photovoltaic power generation project, effectively analyzing various economic parameters, and solving the problem that in the prior art, the practical time without shielding of shadow for the photovoltaic assembly cannot be calculated.
Description
Technical field
The present invention proposes photovoltaic module shadow-free in a kind of photovoltaic generation engineering and blocks Time Calculation method, belongs to photovoltaic and sends out
Electrical engineering technical field.
Background technology
Constantly expand with global economy scale, the demand sustainable growth to the energy for the mankind.At present, the energy that the mankind consume
Source, essentially from fossil fuels such as coal, oil, natural gases, belongs to non-renewable energy resources.Increasingly the exhaustion of conventional energy resource leads to
Becoming increasingly conspicuous of environmental problem, has then caused Regional Pollution and ecodoom, has been embodied in greenhouse
Effect, depletion of the ozone layer, Global climate change, acid rain, species extinction, desertification, sharp reduction of the forests, trans-frontier pollution, ocean
A series of environmental crises such as pollution, wildlife species minimizing, tropical rain forest minimizing, the soil erosion, haze, seriously threaten the mankind's
Survival and development.Exploitation regenerative resource is effectively reduced carbon emission, significant to environmental protection, it has also become global energy circle
Common recognition.The Chinese government pays much attention to the exploitation of regenerative resource, on January 1st, 2006 formal execution《Middle Chinese
People republic Renewable Energy Law》In explicitly point out, country the exploitation of regenerative resource are classified as the preferential of energy development
Field.Solar energy, as the clean energy resource of most economic development value in regenerative resource, has that the amount of accumulateing is huge, Ke Yizai
Raw, widely distributed, the advantages of do not pollute.
Under above-mentioned background, photovoltaic project construction flourishes, and every technology convergence is ripe, and photovoltaic plant overall cost is in
Existing downward trend.Photovoltaic industry technology is made deeper into anatomy imperative, and the time that photovoltaic module shadow-free blocks is then
It is an important parameter of analysis photovoltaic plant economic index.At present, photovoltaic module to be recorded shadow-free in a day blocks
Time, be only capable of carrying out by during the built actual O＆M in power station coming into operation, and the photovoltaic plant place mountain region gradient
Difference, allow the sunshine-duration record become more difficult.Additionally, still not having a kind of software or method can determine at the design initial stage
On the premise of photovoltaic module arrangement, calculate the time that photovoltaic module shadow-free blocks.
Content of the invention
It is an object of the invention to, the solution prior art photovoltaic module actual shadow-free time of blocking cannot calculate a difficult problem,
The present invention can be on known photovoltaic plant location latitude, battery component length, battery component spacing, battery component inclination angle, mountain
After ground these parameters of the gradient, obtain under the conditions of this arrangement, the time that photovoltaic module shadow-free blocks, is photovoltaic plant
Comprehensive analysis important parameter, effect comprehensive analysis items economic parameters are provided.
Technical solution of the present invention is：
In a kind of photovoltaic generation engineering, photovoltaic module shadow-free blocks Time Calculation method, comprises the following steps：
S01, acquisition parameter, described parameter includes local latitude φ, battery component length L, trestle column before and after photovoltaic module
D, photovoltaic module inclination angle a and mountain region gradient inclination angle b；
S02, calculates the declination angle δ of some day in the middle of 1 year, and computing formula is formula (1)：
N is to the total number of days calculating day from New Year's Day；
S03, calculates photovoltaic module relative altitude H and relative spacing D；
D=d × cosb-L × cos (a+b) (2)
H=L × sin (a+b)-L × cos (a+b) × tanb-d × tanb (3)
Wherein, d is trestle column before and after photovoltaic module, and L is battery component length, and a is photovoltaic module inclination angle, and b is mountain region slope
Degree inclination angle；
S04, calculates critical hour angle ω when photovoltaic module shadow-free blocks：
Sun altitude α is：α=arcsin (sin φ sin δ+cos φ cos δ cos ω) (4)
Solar azimuth angle beta is：β=arcsin (cos δ sin ω/cos α) (5)
The relation of photovoltaic module relative altitude H and relative spacing D is：
D=Hcos β/tan α (6)
Tried to achieve by formula (4), (5) and (6)：
Make cos ω=x (8)
H2cos2δ-(H2+D2)cos2φcos2δ=A (9)
-((H2+D2) 2sin φ sin δ cos φ cos δ)=B (10)
H2sin2δ-(H2+D2)sin2φsin2δ=C (11)
Formula (8), (9), (10) and (11) is brought into formula (7), solves：
ω=arccos x (13)
Wherein, α is sun altitude, and β is solar azimuth, and φ is local latitude, and δ is declination angle, and ω is critical hour angle；
S05, calculates the time Δ t that photovoltaic module theory shadow-free blocks：
t1=-ω/15+12 (14)
t2=ω/15+12 (15)
Δ t=t2-t1(16)
In formula, t1Block the crash time for morning photovoltaic module shadow-free, t2Block critical for photovoltaic module shadow-free in afternoon
Time；
S06, calculates irradiation time Δ T in the middle of the sun one day：
Wherein, φ is local latitude, and δ is declination angle.
S07, compares Δ t, the time that the smaller value of Δ T blocks for the actual shadow-free of photovoltaic module.
More preferably, the value of mountain region gradient inclination angle b is：Nan Po is that just north slope is negative, and flat slope is 0.
Beneficial effect of the present invention：
In a kind of photovoltaic generation engineering disclosed by the invention, photovoltaic module shadow-free blocks Time Calculation method, solves existing
The actual shadow-free of technology photovoltaic module blocks a time imponderable difficult problem, in known photovoltaic plant location latitude, battery pack
Part length, battery component spacing, battery component inclination angle, after these parameters of mountain region gradient inclination angle, obtain in this arrangement bar
Under part, the time that photovoltaic module shadow-free blocks, calculate accurately, the comprehensive analysis for photovoltaic plant provides important parameter, and effect is comprehensive
Close the every economic parameters of analysis.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is that in photovoltaic generation engineering of the present invention, photovoltaic module shadow-free blocks Time Calculation method and step schematic diagram；
When Fig. 2 is southern slope for the mountain region gradient, photovoltaic module relative altitude H and relative spacing D calculate schematic diagram；
When Fig. 3 is north slope for the mountain region gradient, photovoltaic module relative altitude H and relative spacing D calculate schematic diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings and by specific embodiment, and following examples are descriptive
, it is not determinate it is impossible to protection scope of the present invention is limited with this.
As shown in figure 1, photovoltaic module shadow-free blocks Time Calculation method in a kind of photovoltaic generation engineering, walk including following
Suddenly：
S01, certain photovoltaic plant factory site latitude is φ=31.61 °, b=0 ° of place gradient inclination angle.Photovoltaic module is taken double
Arrangement, i.e. L=3.32m, a=26 ° of photovoltaic module inclination angle, trestle column d=7.2m before and after assembly.
Carry out calculating the time that winter solstice (December 21) photovoltaic module shadow-free blocks with this computational methods.
S02, calculates winter solstice (December 21) declination angle δ,
Winter solstice is the 355th day in the middle of a year,
S03, calculates photovoltaic module relative altitude H, relative spacing D
D=d × cosb-L × cos (a+b)=4.2160m (2)
H=L × sin (a+b)-L × cos (a+b) × tanb-d × tanb=1.4554m (3)；
The value of mountain region gradient inclination angle b is：Nan Po is that just north slope is negative, and flat slope is 0.When wherein the mountain region gradient is southern slope,
Photovoltaic module relative altitude H and relative spacing D calculate as shown in Fig. 2 when the mountain region gradient is north slope, photovoltaic module relative altitude H
Calculate as shown in Figure 3 with relative spacing D；The present embodiment is north slope, and the value of mountain region gradient inclination angle b is flat slope 0；
S04, calculates critical hour angle ω when photovoltaic module shadow-free blocks：
Sun altitude α is：α=arcsin (sin φ sin δ+cos φ cos δ cos ω) (4)
Solar azimuth angle beta is：β=arcsin (cos δ sin ω/cos α) (5)
The relation of photovoltaic module relative altitude H and relative spacing D is：
D=Hcos β/tan α (6)
Tried to achieve by formula (4), (5) and (6)：
According to cos ω=x (8)
H2cos2δ-(H2+D2)cos2φcos2δ=A (9)
-((H2+D2) 2sin φ sin δ cos φ cos δ)=B (10)
H2sin2δ-(H2+D2)sin2φsin2δ=C (11)
Formula (8), (9), (10) and (11) is brought into formula (7), solves：
Then：
ω=arccosx=58.0543 ° (13)
S05, calculates the time Δ t that photovoltaic module theory shadow-free blocks
t1=-ω/15+12 (14)
t2=ω/15+12 (15)
Δ t=ω/15+12- (- ω/15+12)=7.7418h (16)
S06, calculates irradiation time Δ T in the middle of the sun one day：
S07, compares Δ t, and in Δ T, smaller value is the time that the actual shadow-free of photovoltaic module blocks
Because Δ t ＜ Δ T, the time that is, Δ t blocks for the actual shadow-free of photovoltaic module.
So, in project site is according to the S01 article, parameter carries out assembly arrangement, then actual no in winter solstice photovoltaic module
The time of shadow occlusion is 7.7418 hours, according to photovoltaic plant number of actual measurements it is found that, winter solstice photovoltaic module shadow-free
Time of blocking is 7 hours 45 minutes, and that is, 7.75 hours, result of calculation was consistent with actual measurement data.
Those skilled in the art the present invention can be modified or modification design but the think of without departing from the present invention
Think and scope.Therefore, if these modifications of the present invention and modification belong to the claims in the present invention and its equivalent technical scope
Within, then the present invention is also intended to comprise these changes and modification.
Claims (2)
1. in a kind of photovoltaic generation engineering, photovoltaic module shadow-free blocks Time Calculation method it is characterised in that including following walking
Suddenly：
S01, acquisition parameter, described parameter includes local latitude φ, battery component length L, trestle column d, light before and after photovoltaic module
Volt assembly inclination angle a and mountain region gradient inclination angle b；
S02, calculates the declination angle δ of some day in the middle of 1 year, and computing formula is formula (1)：
N is to the total number of days calculating day from New Year's Day；
S03, calculates photovoltaic module relative altitude H and relative spacing D；
D=d × cosb-L × cos (a+b) (2)
H=L × sin (a+b)-L × cos (a+b) × tanb-d × tanb (3)
Wherein, d is trestle column before and after photovoltaic module, and L is battery component length, and a is photovoltaic module inclination angle, and b inclines for the mountain region gradient
Angle；
S04, calculates critical hour angle ω when photovoltaic module shadow-free blocks：
Sun altitude α is：α=arcsin (sin φ sin δ+cos φ cos δ cos ω) (4)
Solar azimuth angle beta is：β=arcsin (cos δ sin ω/cos α) (5)
The relation of photovoltaic module relative altitude H and relative spacing D is：
D=Hcos β/tan α (6)
Tried to achieve by formula (4), (5) and (6)：
Make cos ω=x (8)
H2cos2δ-(H2+D2)cos2φcos2δ=A (9)
-((H2+D2) 2sin φ sin δ cos φ cos δ)=B (10)
H2sin2δ-(H2+D2)sin2φsin2δ=C (11)
Formula (8), (9), (10) and (11) is brought into formula (7), solves：
ω=arccos x (13)
Wherein, α is sun altitude, and β is solar azimuth, and φ is local latitude, and δ is declination angle, and ω is critical hour angle；
S05, calculates the time Δ t that photovoltaic module theory shadow-free blocks：
t1=-ω/15+12 (14)
t2=ω/15+12 (15)
Δ t=t2-t1(16)
In formula, t1Block the crash time for morning photovoltaic module shadow-free, t2For when afternoon, photovoltaic module shadow-free blocked critical
Between；
S06, calculates irradiation time Δ T in the middle of the sun one day：
Wherein, φ is local latitude, and δ is declination angle；
S07, compares Δ t, the time that the smaller value of Δ T blocks for the actual shadow-free of photovoltaic module.
2. in a kind of photovoltaic generation engineering according to claim 1, photovoltaic module shadow-free blocks Time Calculation method, its
It is characterised by, the value at described mountain region gradient inclination angle is：Nan Po is that just north slope is negative, and flat slope is 0.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109684593A (en) * | 2018-11-19 | 2019-04-26 | 南京国电南自新能源工程技术有限公司 | Mountainous region photovoltaic project array pitch calculation method and system |
| CN111246618A (en) * | 2020-03-12 | 2020-06-05 | 江西五和电气有限公司 | Photovoltaic LED lighting product capable of changing color temperature according to seasons |
| CN112883323A (en) * | 2021-01-11 | 2021-06-01 | 珠海格力电器股份有限公司 | Photovoltaic power generation system and area determination method, device, medium and processor thereof |
| CN113269740A (en) * | 2021-05-19 | 2021-08-17 | 阳光新能源开发有限公司 | Photovoltaic power station installation capacity determination method and device and storage medium |
-
2016
- 2016-11-01 CN CN201610935277.2A patent/CN106447231A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109684593A (en) * | 2018-11-19 | 2019-04-26 | 南京国电南自新能源工程技术有限公司 | Mountainous region photovoltaic project array pitch calculation method and system |
| CN109684593B (en) * | 2018-11-19 | 2023-06-06 | 南京国电南自新能源工程技术有限公司 | Mountain photovoltaic project array spacing calculation method and system |
| CN111246618A (en) * | 2020-03-12 | 2020-06-05 | 江西五和电气有限公司 | Photovoltaic LED lighting product capable of changing color temperature according to seasons |
| CN112883323A (en) * | 2021-01-11 | 2021-06-01 | 珠海格力电器股份有限公司 | Photovoltaic power generation system and area determination method, device, medium and processor thereof |
| CN112883323B (en) * | 2021-01-11 | 2023-06-30 | 珠海格力电器股份有限公司 | Photovoltaic power generation system, area determination method and device thereof, medium and processor |
| CN113269740A (en) * | 2021-05-19 | 2021-08-17 | 阳光新能源开发有限公司 | Photovoltaic power station installation capacity determination method and device and storage medium |
| CN113269740B (en) * | 2021-05-19 | 2024-05-17 | 阳光新能源开发股份有限公司 | Photovoltaic power station installation capacity determination method, device and storage medium |
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Application publication date: 20170222 |