CN110288203A - A kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array - Google Patents

A kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array Download PDF

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CN110288203A
CN110288203A CN201910468372.XA CN201910468372A CN110288203A CN 110288203 A CN110288203 A CN 110288203A CN 201910468372 A CN201910468372 A CN 201910468372A CN 110288203 A CN110288203 A CN 110288203A
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shadow
irradiation
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shelter
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卫东
方洛迪
王茹
叶洪吉
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China Jiliang University
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Abstract

A kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array, it is characterized in that shelter is equivalent to polyhedron, determine that each vertex of polyhedron is validity feature point and is projected on rectangular coordinate system, according to the solar elevation of target date object time, the angular relationship of solar azimuth and shelter, calculate the shadow length of shelter, in conjunction with effective characteristic point coordinate, from the shadow occlusion start and ending moment, data calculating, which is carried out, every cycle time describes shadow spots, integrating meter is carried out to irradiation intensity simultaneously and calculates irradiation loss late, shadow region is divided into different extent of damage regions, to improve power generation while guaranteeing that power generation is safe.

Description

A kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array
Technical field:
The present invention relates to field of photovoltaic power generation, specially a kind of irradiation amount loss rate of barrier shadow region photovoltaic array Dynamic calculation method.
Background technique:
With the rapid growth of global energy requirements, photovoltaic power generation technology causes countries in the world scholar and industry A large amount of concerns, temperature ramp.Photovoltaic power generation is related to extensive field, especially photovoltaic power station, belongs to country Encourage maximum green electric power supply exploitation energy project.Photovoltaic power station is because it goes to fabricating yard to require more low advantage, closely Develop over year rapidly, however component fabricating yard is generally industrial building or local-style dwelling houses roof, for the shade for avoiding architectural barriers object It influences, the installation region of component suffers from great limitation, and how scientific and reasonable determination installation region becomes design distribution The matter of utmost importance of formula photovoltaic plant, existing most of photovoltaic design companies all with guarantee at 9 points in morning winter solstice at 15 points in afternoon without It blocks as condition design photovoltaic module installation region, can guarantee annual most photovoltaic timing components as design considerations It is unobstructed, however consider that power station investment repayment and income rationally expand mounting area on the basis of not damaging component, it improves Installed capacity is conducive to promote power station income, realizes maximizing the benefits, and it to be installing zone that therefore, it is necessary to the new evaluation indexes of establishment The optimization in domain provides reasonable design considerations.It is calculated in conjunction with the dynamic of each installation region irradiation amount loss rate, photovoltaic group can be optimized Part array mounting arrangement reaches power station power generation safety and promotes the balance between economic benefit.
Summary of the invention:
The present invention proposes a kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array, passes through meter The irradiation amount loss rate that power station photovoltaic module intends installation region is calculated, region division is carried out to quasi- installation region, component is installed on In suitable regional scope, power generation is improved.
By this purpose, proposed adoption following technical scheme of the present invention:
Shelter is equivalent to polyhedron first, determines that each vertex of polyhedron is validity feature point and is projected on right angle Coordinate system, according to the solar elevation α of target date object times, solar azimuth γsWith the angular relationship of shelter, calculate The shadow length of shelter, in conjunction with effective characteristic point coordinate, from the shadow occlusion start and ending moment, every cycle time T into The calculating of row data describes shadow spots, while carrying out integrating meter to irradiation intensity and calculating irradiation loss late, and shadow region is divided At different extent of damage regions, to improve power generation while guaranteeing that power generation is safe, the specific steps are as follows:
Step 1: barrier it is equivalent
Using position between east and west as X-axis, north-south orientation establishes plane right-angle coordinate as Y-axis, when there are camber line constitute or Person it is more complicated when blocking object, be equivalent to polyhedron, determine the validity feature point for determining to block shadow of object track, Validity feature point is projected in rectangular coordinate system, the coordinate (X for blocking object validity feature point is obtainedm, Ym) and its height hm, Wherein m indicates m-th of validity feature point；
Step 2: shadow length calculates
Declination angle δ of the target cities on the day of target date is calculated, as shown in formula (1):
In formula (1), day is number of days of the current date in 1 year；
Using the geographic latitude φ of declination angle δ and city, the solar elevation α of object time is calculatedsAnd solar azimuth Angle γs, can by obtained by formula (2) (3),
In formula (2) (3), t indicates object time；φ indicates geographic latitude.
According to each validity feature point height h of sheltermWith shadow length LmTangent relationship, tangent angle is altitude of the sun Angle αs, the shelter validity feature point shadow length L of t moment is obtained in conjunction with trigonometric function formula and formula (2)m, shadow length LmTable Up to shown in formula such as formula (4):
Step 3: shade coordinate calculates
Using blocking object validity feature point coordinate (Xm, Ym), in conjunction with solar azimuth γsWith each validity feature of shelter Point shadow length Lm, calculate shadow spots coordinate (XSm, YSm), calculation equation such as formula (5):
Step 4: irradiation amount loss rate dynamic calculates:
It completes t moment and determines that the data of the validity feature point of view field's range calculate, obtain shadow spots coordinate (XSm, YSm) after, it is fastened into description in rectangular co-ordinate, draws the shade coverage area for blocking object of t moment；
Same day irradiation intensity is integrated, obtains a day total amount of irradiation, at interval of period of time T, irradiation intensity is carried out Integral obtains the irradiation of t moment shade overlay area loss, shown in formula such as formula (6):
In formula (6), F (t) indicates loss irradiation；F (t) is continuous intensity of illumination function；t1、t2Indicate shadow occlusion Moment, wherein t2-t1To calculate period of time T；f(xi) be sampling instant intensity of illumination；xiIndicate sampling instant；J is irradiation Intensity sampling point number；
From this period at shadow occlusion start and ending moment, according to formula (1)-(5) computational shadowgraph occlusion area, according to Formula (6) calculates the area loss irradiation, and is folded for the loss of the irradiation of different moments shadow region lap Add, formula such as formula (7):
FS (t)=F (t) * N (7)
In formula (7), N is overlapping number；FS (t) is the loss irradiation of shaded region lap；
It enables shadow loss irradiation compared with day total amount of irradiation, irradiation amount loss rate is obtained, according to spoke in shadow region According to amount loss rate size to region division, shadow region is divided into different extent of damage regions.
Detailed description of the invention:
Fig. 1 proposes the optimized flow chart of the photovoltaic panel installation about shade for the present invention；
Specific embodiment:
The present invention is described further with reference to the accompanying drawings and embodiments.Fig. 1 is optimization method implementation flow chart.With this Based on flow chart, specific calculated examples are provided:
Assuming that it is all 1m, the cube of south-north direction that block object, which be length, width and height,.Using the sunny winter solstice as target date into The optimization of row installation region, detailed process is as follows:
Barrier it is equivalent:
Using north-south orientation as Y-axis, plane right-angle coordinate is established as X-axis in thing orientation, determines and determines to block object Validity feature point is to block 4 angles at the top of object, will block object validity feature point and is projected on reference axis, coordinate be respectively (- 1, -1), (- 1,1), (1,1), (1, -1), are highly 1m.
Shadow length calculates:
Declination angle δ of the target cities on the day of target date is calculated, as shown in formula (1):
In formula (1), day is the number of days serial number in current date 1 year, and target date number of days is brought into formula (1), is calculated red δ=- 23 ° 27 ' of latitude angle calculates the solar elevation α of object time using the geographic latitude φ of declination angle δ and citysToo Positive azimuth γs, can by obtained by formula (2) (3),
In formula (2), t indicate object time, i.e., 9 when 15 interior any moment, if object time be 9: 15, need it Minute, position was converted into percentage, and t=9.25 after conversion is brought into formula (2), calculated solar elevation αsIt=23.45 °, utilizes formula (3) Calculate solar azimuth γs=-41.25 °.
Due to blocking object height and blocking object shadow length there are tangent relationship, tangent angle is solar elevation αs, In conjunction with the solar elevation α obtained in trigonometric function formula and formula (2)s, each effective spy of 9: 15 moment shelters can be calculated Sign point shelter shadow length Lm, shadow length LmShown in expression formula such as formula (4):
M indicates m-th of validity feature point in formula (4).
The calculating of shade coordinate:
Learn that 4 characteristic points, feature point height are 1m by step (1), formula (4) calculates shelter shadow length Lm It is 2.31m, in conjunction with trigonometric function formula, calculates the shadow spots coordinate of 9: 15 moment validity feature points, calculation equation is such as Formula (5):
By formula (5), validity feature point (- 1, -1), (1,1), (- 1,1), (1, -1) corresponding shade coordinate be respectively (- 2.52,0.74), (- 0.52,2.74), (- 2.52,2.74), (- 0.52,0.74).
Amount loss rate dynamic is irradiated to calculate:
The data for the validity feature point for determining view field's range are calculated, shadow spots coordinate (XS is obtainedm, YSm), by its Description is fastened in rectangular co-ordinate, draws the shade coverage area for blocking object at moment；
Summation integral is carried out to irradiation intensity on the day of certain power station, show that total amount of irradiation is 858KJ/m in one day2, at interval of Period of time T integrates irradiation intensity to obtain the irradiation of t moment shade overlay area loss, formula such as formula (6) institute Show:
In formula (6), F (t) indicates loss irradiation；F (t) is continuous intensity of illumination function；t1、t2Indicate shadow occlusion Moment, wherein t2-t1To calculate period of time T；f(xi) be sampling instant intensity of illumination；xiIndicate sampling instant；J is irradiation Intensity sampling point number.
From this period at shadow occlusion start and ending moment, according to formula (1)-(5) computational shadowgraph occlusion area, according to Formula (6) calculates the area loss irradiation, and is folded for the loss of the irradiation of different moments shadow region lap Add, formula such as formula (7):
FS (t)=F (t) * N (7)
In formula (7), N is overlapping number；FS (t) is the loss irradiation of shaded region lap；
It enables shadow loss irradiation compared with day total amount of irradiation, irradiation amount loss rate is obtained, according to spoke in shadow region According to amount loss rate size to region division, shadow region can be divided into different extent of damage regions, photovoltaic is installed for power station Component provides design considerations.

Claims (1)

1. a kind of irradiation amount loss rate Dynamic calculation method of barrier shadow region photovoltaic array, it is characterised in that by shelter It is equivalent to polyhedron, determines that each vertex of polyhedron is validity feature point and is projected on rectangular coordinate system, according to target date The solar elevation α of object times, solar azimuth γsWith the angular relationship of shelter, the shadow length of shelter is calculated, is tied Validity feature point coordinate is closed, from the shadow occlusion start and ending moment, data calculating is carried out every cycle time T and describes shade Point, while integrating meter is carried out to irradiation intensity and calculates irradiation loss late, shadow region is divided into different extent of damage areas Domain, to improve power generation while guaranteeing that power generation is safe, the specific steps are as follows:
Step 1: barrier it is equivalent
Using position between east and west as X-axis, north-south orientation establishes plane right-angle coordinate as Y-axis, when there are camber line composition or ratios It is more complex to be equivalent to polyhedron when blocking object, it determines the validity feature point for determining to block shadow of object track, will have Projecting characteristic points are imitated in rectangular coordinate system, obtain the coordinate (X for blocking object validity feature pointm, Ym) and its height hm, wherein m Indicate m-th of validity feature point；
Step 2: shadow length calculates
Declination angle δ of the target cities on the day of target date is calculated, as shown in formula (1):
In formula (1), day is number of days serial number of the current date in 1 year；
Using the geographic latitude φ of declination angle δ and city, the solar elevation α of object time is calculatedsWith solar azimuth γs, Can by obtained by formula (2) (3),
In formula (2) (3), t indicates object time；φ indicates geographic latitude；
According to each validity feature point height h of sheltermWith shadow length LmTangent relationship, tangent angle be solar elevation αs, The shelter validity feature point shadow length L of t moment is obtained in conjunction with trigonometric function formula and formula (2)m, shadow length LmExpression formula As shown in formula (4):
Step 3: shade coordinate calculates
Using blocking object validity feature point coordinate (Xm, Ym), in conjunction with solar azimuth γsWith each validity feature point of shelter Shadow length Lm, calculate shadow spots coordinate (XSm, YSm)；Calculation equation such as formula (5):
Step 4: irradiation amount loss rate dynamic calculates:
It completes t moment and determines that the data of the validity feature point of view field's range calculate, obtain shadow spots coordinate (XSm, YSm) after, It is fastened into description in rectangular co-ordinate, draws the shade coverage area for blocking object of t moment；
Same day irradiation intensity is integrated, obtains a day total amount of irradiation, at interval of period of time T, irradiation intensity is integrated The irradiation of t moment shade overlay area loss is obtained, shown in formula such as formula (6):
In formula (6), F (t) indicates loss irradiation；F (t) is continuous intensity of illumination function；t1、t2Indicate the shadow occlusion moment, Wherein t2-t1To calculate period of time T；f(xi) be sampling instant intensity of illumination；xiIndicate sampling instant；J adopts for irradiation intensity Sampling point number；
From this period at shadow occlusion start and ending moment, according to formula (1)-(5) computational shadowgraph occlusion area, according to formula (6) the area loss irradiation is calculated, and is overlapped for the loss of the irradiation of different moments shadow region lap, it is public Formula such as formula (7):
FS (t)=F (t) * N (7)
In formula (7), N is overlapping number；FS (t) is the loss irradiation of shaded region lap；
It enables shadow loss irradiation compared with day total amount of irradiation, irradiation amount loss rate is obtained, according to irradiation in shadow region Shadow region is divided into different extent of damage regions to region division by loss late size.
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CN110334466A (en) * 2019-07-16 2019-10-15 河海大学常州校区 A kind of calculation method of non-uniform irradiation distribution lower component failure probability
CN110705727A (en) * 2019-09-30 2020-01-17 山东建筑大学 Photovoltaic power station shadow shielding diagnosis method and system based on random forest algorithm
CN112272007A (en) * 2020-10-30 2021-01-26 合肥阳光新能源科技有限公司 Method and device for determining influence of shelter on photovoltaic module
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
CN113139995A (en) * 2021-04-19 2021-07-20 杭州伯资企业管理合伙企业(有限合伙) Low-cost method for detecting and evaluating light occlusion between objects
CN114397322A (en) * 2021-11-26 2022-04-26 广东电网有限责任公司阳江供电局 Heat dissipation index measuring method, system and device based on shadow compensation

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Publication number Priority date Publication date Assignee Title
CN110334466A (en) * 2019-07-16 2019-10-15 河海大学常州校区 A kind of calculation method of non-uniform irradiation distribution lower component failure probability
CN110334466B (en) * 2019-07-16 2022-08-16 河海大学常州校区 Method for calculating failure probability of components under non-uniform irradiation distribution
CN110705727A (en) * 2019-09-30 2020-01-17 山东建筑大学 Photovoltaic power station shadow shielding diagnosis method and system based on random forest algorithm
CN112272007A (en) * 2020-10-30 2021-01-26 合肥阳光新能源科技有限公司 Method and device for determining influence of shelter on photovoltaic module
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
CN113139995A (en) * 2021-04-19 2021-07-20 杭州伯资企业管理合伙企业(有限合伙) Low-cost method for detecting and evaluating light occlusion between objects
CN113139995B (en) * 2021-04-19 2022-06-21 杭州伯资企业管理合伙企业(有限合伙) Low-cost method for detecting and evaluating light occlusion between objects
CN114397322A (en) * 2021-11-26 2022-04-26 广东电网有限责任公司阳江供电局 Heat dissipation index measuring method, system and device based on shadow compensation
CN114397322B (en) * 2021-11-26 2024-02-06 广东电网有限责任公司阳江供电局 Heat dissipation index measurement method, system and device based on shadow compensation

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