CN109325708A - Photovoltaic electrification component dust stratification cleaning period determines method - Google Patents
Photovoltaic electrification component dust stratification cleaning period determines method Download PDFInfo
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- CN109325708A CN109325708A CN201811283443.0A CN201811283443A CN109325708A CN 109325708 A CN109325708 A CN 109325708A CN 201811283443 A CN201811283443 A CN 201811283443A CN 109325708 A CN109325708 A CN 109325708A
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Abstract
The present invention is suitable for technical field of photovoltaic power generation, it provides a kind of photovoltaic electrification component dust stratification cleaning period and determines method, the second relational expression of the first relational expression and photovoltaic electrification component light transmittance of dust stratification density and light transmittance and generated energy on photovoltaic electrification component is derived respectively first, then according to the relational expression of the first relational expression and the second relational expression export photovoltaic electrification component generated energy and cleaning period.Thus operating personnel can determine cleaning period by final relational expression, and the cleaning period specified by such method is more reasonable, can achieve the effect that neither waste of resource does not influence normal power generation again.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation more particularly to a kind of photovoltaic electrification component dust stratification cleaning period determination sides
Method.
Background technique
In recent years, in face of outstanding day by day environmental problem, countries in the world formulate for new energy such as wind, light and implement length
The phase strategy of sustainable development, generation of electricity by new energy amount account for the continuous improvement of total power generation ratio.As photovoltaic industry cost constantly reduces
It is landed with subsidy policy, photovoltaic industry rapidly develops, and all kinds of intensity of illumination areas, photovoltaic power generation project puts into operation on a large scale.Photovoltaic
The problem of root problem of the development of industry is cost absorbing and benefit, photovoltaic module common at present is mostly crystal silicon battery and copper and indium gallium
Selenium hull cell, battery material cover high transparency tempered glass sheath, are fabricated to the photovoltaic module of various specifications.
After photovoltaic plant is built up, in addition to the maintenance of daily electrical equipment conventional operation, power station photovoltaic module O&M becomes one
New project.The problems such as dust storm, dust, mechanical defect and local hot spot, becomes to be treated main in photovoltaic plant operation
Problem, wherein the accumulation of dust storm dust influences the most obvious and generally existing, DIFFERENT METEOROLOGICAL CONDITIONS to photovoltaic module transformation efficiency
Under, the accumulation of dust storm dust becomes different to the influence degree of light conversion efficiency, according to statistical data, influences serious up to close
30% is even more, influence small also above 10%.As it can be seen that later period O&M, which carries out component to clean, just becomes extremely important.
Currently, the dust stratification to photovoltaic electrification component maintenance by the way of periodic cleaning, when cleaning, on photovoltaic electrification component
It is very few, cause to waste manpower and material resources, result in waste of resources, dust stratification is excessive, influences the generated energy of photovoltaic electrification component.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of photovoltaic electrification component dust stratification cleaning periods to determine method, with solution
The certainly unascertainable problem of photovoltaic electrification component cleaning period in the prior art.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of photovoltaic electrification component dust stratification cleans
Cycle determination method, comprising:
Establish the first relational expression of dust stratification density and light transmittance on photovoltaic electrification component；
Establish the second relational expression of photovoltaic electrification component light transmittance and generated energy；
According to first relational expression and second relational expression export photovoltaic electrification component generated energy and cleaning period
Relational expression.
Further, first relational expression and second relational expression are obtained by establishing model.
Further, first relational expression are as follows:
Y=e-kx
Wherein, y is light transmittance, and x is dust stratification density, and k is constant.
Further, the k value influence factor includes geographical location, air quality and meteorological condition.
Further, the determination method of the k value are as follows:
It chooses the identical photovoltaic electrification component of several parameters to be placed in same environment, makes photovoltaic electrification component surface
Natural dust stratification；
The generated energy that each photovoltaic electrification component is measured in identical light environment calculates each light according to the second relational expression
Lie prostrate the light transmittance of electrification component；
It collects each photovoltaic power generation group upper dust stratification is weighed, be obtained often in conjunction with the areal calculation of photovoltaic electrification component
The dust stratification density of a photovoltaic electrification component；
The light transmittance of each photovoltaic electrification component and dust stratification density are calculated to the k value for obtaining each photovoltaic electrification component；
The k value of several photovoltaic electrification components is averaged, final k value is obtained.
Further, the relational expression of the photovoltaic electrification component generated energy and cleaning period calculates process are as follows:
Wherein, GiFor i-th day generated energy, yiFor the light transmittance of i-th day photovoltaic electrification component, f (n) is average daily loss, n
For cleaning period, 0 n≤30 <；
In short time, intensity of illumination is stablized, i.e. GnFor definite value, i.e.,It asks its extreme value that can obtain n optimal value, can obtain:
Wherein, n is cleaning period, and 0 < n≤30, k is constant, and C is to clean cost, and G is generated energy.
The beneficial effects of adopting the technical scheme are that the present invention devises a kind of photovoltaic electrification component dust stratification
Cleaning period determines method, derives the first relational expression and light of dust stratification density and light transmittance on photovoltaic electrification component respectively first
The second relational expression of electrification component light transmittance and generated energy is lied prostrate, then according to the first relational expression and the second relational expression export photovoltaic hair
The relational expression of electrical component generated energy and cleaning period.Thus operating personnel can determine cleaning period by final relational expression,
The cleaning period specified by such method is more reasonable, can reach neither waste of resource and not influence the effect of normal power generation
Fruit.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the flow chart that photovoltaic electrification component dust stratification cleaning period provided in an embodiment of the present invention determines method；
Fig. 2 is that k value provided in an embodiment of the present invention determines method flow diagram.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
As shown in Figure 1, determining the process of method for photovoltaic electrification component dust stratification cleaning period provided in an embodiment of the present invention
Figure, step include:
Step S101 establishes the first relational expression of dust stratification density and light transmittance on photovoltaic electrification component.
Step S102 establishes the second relational expression of photovoltaic electrification component light transmittance and generated energy.
Step S103, according to the first relational expression and the second relational expression export photovoltaic electrification component generated energy and cleaning period
Relational expression.
This method derives the first relational expression and photovoltaic of dust stratification density and light transmittance on photovoltaic electrification component respectively first
Then second relational expression of electrification component light transmittance and generated energy exports photovoltaic power generation according to the first relational expression and the second relational expression
The relational expression of component generated energy and cleaning period.Thus operating personnel can determine cleaning period by final relational expression, lead to
It is more reasonable to cross the specified cleaning period of such method, can achieve the effect that neither waste of resource does not influence normal power generation again.
In one embodiment of the present of invention, the first relational expression and the second relational expression are obtained by establishing model.In determination
Modelling is carried out according to the actual situation before relational expression, and the derivation of relational expression is then carried out according to the model of foundation, passes through this
The relational expression that kind method obtains can be more nearly the actual conditions of photovoltaic electrification component, achieve the effect that improve accuracy.
In one embodiment of the present of invention, the first relational expression derivation process are as follows:
The square glass plate for being 1 for one piece of area, surface undergoes dust deposit process, if not by dust stratification shielded area
For A, having fallen into the equivalent equivalent diameter dust granule amount of glass pane surface is N, it is contemplated that the subsequent particle that falls into is possible to fall
On a cluster group rather than on a glass, therefore A and N relationship has:
Then: A=e-NIt can be seen that non-dead area A and dust stratification quantity N are exponential relationship, and light transmittance y and group during dust stratification
Part surface light transmittance A is linear relationship, therefore light transmittance and dust stratification density relationship form are as follows:
Y=e-kx
Wherein, y is light transmittance, and x is dust stratification density, unit g/m2, k is constant.
For meteorological condition difference, the different area of pollution level, since the souring of rainy snow-broth exists, x has it
Natural permafrost table value.The higher area of pollution level, the upper limit value of x are bigger.For DIFFERENT METEOROLOGICAL CONDITIONS, filthy horizontal area, k
It is worth also not identical.
As shown in Fig. 2, the determination method of k value are as follows:
Step S201 chooses the identical photovoltaic electrification component of several parameters and is placed in same environment, sends out photovoltaic
Electrical component surface nature dust stratification.
Step S202 measures the generated energy of each photovoltaic electrification component in identical light environment, according to the second relational expression
Calculate the light transmittance of each photovoltaic electrification component.
Step S203 collects each photovoltaic power generation group and upper dust stratification is weighed, in conjunction with the area of photovoltaic electrification component
Calculate the dust stratification density for obtaining each photovoltaic electrification component.
Step 204, the light transmittance of each photovoltaic electrification component and dust stratification density are calculated and obtains each photovoltaic electrification component
K value.
The k value of several photovoltaic electrification components is averaged by step S205, obtains final k value.
In one embodiment of the present of invention, the relational expression of photovoltaic electrification component generated energy and cleaning period calculates process are as follows:
If photovoltaic system capacity is M kW, single photovoltaic module power is W watts, and area is S (unit cm2), it is current good
Daily generation G kWh under weather, component cleaning up cost is by the electricity charge, cost of labor, cleaning equipment cost and other mating consumptive materials
Four parts composition, i.e., clean cost every time:
C=E+H+V+L
Wherein, E is the electricity charge, H is cost of labor, V is cleaning equipment cost, L is other mating consumptive materials.
If f is daily loss function (electric quantity loss and cleaning investment), average daily to lose for a n days cleaning period are as follows:
Wherein, GiFor i-th day generated energy, yiFor i-th day dust accumulation.
Within one not too long of time, in general intensity of sunshine is relatively stable, it is assumed that in a short time, GnFor definite value,It asks its extreme value that can obtain n optimal value, can obtain:
For functionN is in general not too large, within 30.And function is in certain value model
In enclosing, it is closer to straight line.It means that generated energy is inversely proportional with cleaning period n, i.e., when generated energy increasing is twice,
Cleaning period n should shorten half.
The advantages of this method:
(1) model is stacked using dirt accumulation, disclosing non-dead area A and dust stratification quantity N is exponential relationship, and the mould
The more common linear model of type more meets actual field situation.
(2) relational expression that model inference goes out generated energy and cleaning period is stacked according to dirt accumulation, facilitates engineer application.
(3) floating cleaning period is proposed according to generated energy, intensity of illumination good season should suitably improve according to charge condition
Cleaning period reduces economic loss for electricity power enterprise.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (6)
1. a kind of photovoltaic electrification component dust stratification cleaning period determines method characterized by comprising
Establish the first relational expression of dust stratification density and light transmittance on photovoltaic electrification component；
Establish the second relational expression of photovoltaic electrification component light transmittance and generated energy；
According to the relationship of first relational expression and second relational expression export photovoltaic electrification component generated energy and cleaning period
Formula.
2. photovoltaic electrification component dust stratification cleaning period according to claim 1 determines method, which is characterized in that described first
Relational expression and second relational expression are obtained by establishing model.
3. photovoltaic electrification component dust stratification cleaning period according to claim 1 determines method, which is characterized in that described first
Relational expression are as follows:
Y=e-kx
Wherein, y is light transmittance, and x is dust stratification density, and k is constant.
4. photovoltaic electrification component dust stratification cleaning period according to claim 3 determines method, which is characterized in that the k value
Influence factor includes geographical location, air quality and meteorological condition.
5. photovoltaic electrification component dust stratification cleaning period according to claim 3 determines method, which is characterized in that the k value
Determination method are as follows:
It chooses the identical photovoltaic electrification component of several parameters to be placed in same environment, keeps photovoltaic electrification component surface natural
Dust stratification；
The generated energy that each photovoltaic electrification component is measured in identical light environment calculates each photovoltaic according to the second relational expression and sends out
The light transmittance of electrical component；
It collects each photovoltaic power generation group upper dust stratification is weighed, obtains each light in conjunction with the areal calculation of photovoltaic electrification component
Lie prostrate the dust stratification density of electrification component；
The light transmittance of each photovoltaic electrification component and dust stratification density are calculated to the k value for obtaining each photovoltaic electrification component；
The k value of several photovoltaic electrification components is averaged, final k value is obtained.
6. photovoltaic electrification component dust stratification cleaning period according to claim 1 determines method, which is characterized in that the photovoltaic
The relational expression of electrification component generated energy and cleaning period calculates process are as follows:
Wherein, GiFor i-th day generated energy, yiFor the light transmittance of i-th day photovoltaic electrification component, f (n) is average daily loss, and n is clear
It sweeps the period, 0 n≤30 <；
In short time, intensity of illumination is stablized, i.e. GnFor definite value, i.e.,It asks its extreme value that can obtain n optimal value, can obtain:
Wherein, n is cleaning period, and 0 < n≤30, k is constant, and C is to clean cost, and G is generated energy.
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