CN109389311A - A method of output power of photovoltaic module impact factor is calculated based on meteorological condition - Google Patents
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Abstract
The invention discloses a kind of methods for calculating output power of photovoltaic module impact factor based on meteorological condition to obtain output power of photovoltaic module impact factor by calculating temperature revisory coefficient, low irradiation revisory coefficient and the spectrum revisory coefficient of photovoltaic module.The present invention is under any any solar spectrum of irradiation level arbitrary temp, only it is to be understood that the factory parameter of solar cell can accurately calculate the output power impact factor of component, and then the output power of optimization component.
Description
Technical field
The present invention relates to a kind of methods for calculating output power of photovoltaic module impact factor based on meteorological condition, belong to photovoltaic
Assembly property analysis technical field.
Background technique
The output power of photovoltaic module is basis and the core of the entire photovoltaic system power generation of evaluation, technically to improve hair
Electricity, the power of reply component first have an accurately assessment.Chen Yuwei output power of photovoltaic module analysis of Influential Factors [J]
Scientific and technological visual field, 2017 (20): the surface cleanness that 53-54+64. analyzes intensity of illumination, environment temperature and component is defeated to component
The influence of power and Influencing Mechanism out, and give propose high-power suggestion more accordingly.Guo Changxing, Shen Na, Han Fengqin, woods
Great waves, research [J] the new energy progress of Yang Shangxing solar-energy photo-voltaic cell multi-parameter output characteristics, 2017,5 (02): 136-
140. proposing foundation solar cell factory parameter (short circuit current, open-circuit voltage, maximum power point voltage and a maximum power point
Electric current) it is any under the conditions of current-voltage equation model, and then predict power.Existing research is mainly to photovoltaic module
Each influence factor (temperature, irradiation level and solar spectrum etc.) of output power carries out qualitative analysis and approximate quantitative analysis, but
Not to the second level impact factor quantitative research of power, also the interaction of these factors is not analysed in depth.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, provide a kind of based on meteorological condition calculating
The method of output power of photovoltaic module impact factor introduces temperature revisory coefficient, low irradiation revisory coefficient and spectrum revisory coefficient,
To estimate the output power impact factor of component, and then the output power of optimization component.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
A method of output power of photovoltaic module impact factor is calculated based on meteorological condition, comprising the following steps:
1) temperature revisory coefficient K is calculatedT:
KT=2.49-0.005Tc
Wherein, TcFor photovoltaic module temperature；
2) low irradiation revisory coefficient K is calculatedH:
Wherein, H is local irradiation level, I1(H) and U1(H) under any irradiation level of photovoltaic module real work electric current and
Operating voltage；I2(H) and U2It (H) is the specified point electric current and specified point voltage under any irradiation level of photovoltaic module, the specified point
Electric current and specified point voltage refer to generated electric current and voltage when the load of the external determination of photovoltaic module；
3) spectrum revisory coefficient K is calculatedS:
KS=1+k
Wherein, k is that photovoltaic module effective unit photogenerated current is opposite with the unit photogenerated current under standard test condition
Error；
4) output power of photovoltaic module impact factor K is calculated；The impact factor is temperature revisory coefficient, low irradiation revision
Coefficient and spectrum revisory coefficient, the product of three:
K=KT·KH·KS。
In aforementioned step 1), photovoltaic module temperature TcIt calculates as follows:
Wherein, TaFor environment temperature, ω is installation coefficient, VfFor wind speed.
In aforementioned step 2), the real work electric current under any irradiation level of photovoltaic module calculates as follows:
I1(H)=1.2 × 10-4H
Real work voltage under any irradiation level of photovoltaic module is the inverse function of function shown in following formula:
Wherein, U is real work voltage.
Specified point electric current in aforementioned step 2), under any irradiation level of photovoltaic module are as follows:
Wherein, ISTCIt is standard test condition specified point electric current, HSTCIt is the irradiation level of standard test condition, value is
1000W/m2；
Specified point voltage under any irradiation level of photovoltaic module are as follows:
U2(H)=USTC·ln(e+b(H-HSTC))
Wherein, USTCIt is standard test condition specified point voltage, e is the truth of a matter of constant natural logrithm, and b is penalty coefficient,
Value is 0.005 (W/m2)-1。
Unit photogenerated current in aforementioned step 3), under photovoltaic module effective unit photogenerated current and standard test condition
Relative error k calculating it is as follows:
Wherein, iph(λ) is unit photogenerated current, iph- STC (λ) is the unit photogenerated current under standard spectrum AM1.5；
Unit photogenerated current iphThe expression formula of (λ) are as follows:
Wherein, Iph(λ) is photogenerated current；
Photogenerated current IphThe expression formula of (λ) are as follows:
Wherein, h is planck constant, and c is the light velocity, and α (λ) is EVA transmitance, and β (λ) is glass transmitance, QE (λ) amount of being
Sub- efficiency, G (λ) is spectral irradiance.
The fitting expression of quantum efficiency QE (λ) above-mentioned are as follows:
QE (λ)=4 × 10-17λ6-2×10-13λ5+4×10-10λ4-4×10-7λ3+2×10-4λ2- 0.03 λ+0.98,
300nm < λ < 1100nm；
Define the product that total transmittance γ (λ) is EVA transmitance α (λ) and glass transmitance β (λ), fitting expression are as follows:
γ (λ)=4 × 10-16λ6-2×10-12λ5+2×10-9λ4-2×10-6λ3+5×10-4λ2- 0.02 λ+78.93,
380nm < λ < 1015nm.
The beneficial effects obtained by the present invention are as follows are as follows:
Under any solar spectrum of any irradiation level arbitrary temp, only it is to be understood that the factory parameter (standard testing of solar cell
Under the conditions of open-circuit voltage Uoc-STC, short circuit current Isc-STC, maximum power point voltage Im-STCWith maximum power point electric current Um-STC),
Can by temperature revisory coefficient, the output power that low irradiation revisory coefficient and spectrum revisory coefficient accurately calculate component influence because
Son, and then the output power of optimization component.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is electric current and irradiation level relational graph；
Fig. 3 is quantum efficiency and wavelength relationship figure；
Fig. 4 is total transmittance and wavelength relationship figure.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
The output power of photovoltaic module is mainly related with component temperature, irradiation level and solar spectrum, photovoltaic module output electricity
Stream slightly increases and linear with irradiation level with the raising of temperature, the output voltage of battery with temperature increase and reduce and
With irradiation level at logarithmic relationship, and in the case where identical irradiation level and temperature, solar spectrum distribution difference can also cause power
Variation.Accurately to study influence of these three factors to component output power, temperature revisory coefficient K is proposed respectivelyT, low irradiation
Revisory coefficient KHWith spectrum revisory coefficient KS, component output power impact factor K is the product of three revisory coefficients.
The method that output power of photovoltaic module impact factor is calculated based on meteorological condition of the invention, as shown in Figure 1, including
Following steps:
1) expression formula of temperature revisory coefficient, comprising the following steps:
1-1) determine component temperature, the temperature of component is related with solar irradiation and environment temperature, while considering the shadow of wind speed
It rings, introduces Skoplaki model:
Wherein, TcAnd TaIt is component temperature and environment temperature respectively, ω is defined as installation coefficient, the installation situation with component
It is related, self-supporting is installed, ω takes 1, VfIt is wind speed, H is local irradiation level.
1-2) temperature revisory coefficient expression formula, it is assumed that temperature revisory coefficient KTFor TcLinear function relationship, in standard
Test condition TcUnder=298K, KT=1, but component power declines, amplitude 0.5%/K with the raising of temperature, therefore can indicate
Are as follows:
KT=2.49-0.005Tc (2)
2) expression formula of low irradiation revisory coefficient is derived, comprising the following steps:
It is 2-1) directly proportional to irradiation level in low irradiation lower component real work electric current, their relationship is shown in Fig. 2, is passed through
Linear fit can obtain:
I1(H)=1.2 × 10-4H (3)
Wherein, H is local irradiation level, I1It (H) is real work electric current.
2-2) relationship of irradiation level and component real work voltage has given below:
Wherein, U is virtual voltage, TcIt is component temperature, can be calculated by formula (1).It can be acquired shown in formula (4) by Matlab
The inverse function U of function1(H)。U1It (H) is that formula (4) is negated the function expression of voltage U and irradiation level H that function obtains.
The influence of temperature is not considered 2-3), defining generated electric current when the load of the external determination of solar cell is specified point
The voltage of electric current, generation is specified point voltage, and using the irradiation level of standard test condition as foundation, theoretical calculation goes out any irradiation level
Under component specified point electric current I2(H):
Wherein, H is irradiation level, ISTCIt is standard test condition specified point electric current, HSTCIt is the irradiation level of standard test condition,
Its value is 1000W/m2.When external load is 0, ISTC=Isc-STC, thus can determine the short circuit electricity of any irradiation level lower component
Stream；When specified point is maximum power point, ISTC=Im-STC, thus can determine the maximum power point electricity of any irradiation level lower component
Stream.
The influence for not considering temperature 2-4), using the irradiation level of standard test condition as foundation, theoretical calculation goes out any irradiation
Component specified point voltage U under degree2(H):
U2(H)=USTC·ln(e+b(H-HSTC)) (6)
Wherein, H is irradiation level, USTCIt is standard test condition specified point voltage, e is the truth of a matter of constant natural logrithm, and b is
Penalty coefficient, value are 0.005 (W/m2)-1.When external load is ∞, USTC=Uoc-STC, thus can determine any irradiation level
The open-circuit voltage of lower component；When specified point is maximum power point, USTC=Um-STC, thus can determine any irradiation level lower component
Maximum power point voltage.
The calculating formula for 2-5) combining power, when actual power is equal with specified point power, KH=1, with external load
Variation, KHAlso change therewith, low irradiation revisory coefficient K can be obtainedHExpression formula:
3) process of spectrum revisory coefficient is calculated, comprising the following steps:
3-1) photogenerated current Iph(λ) can be calculated by formula (8):
Wherein, h is planck constant, and c is the light velocity, and it is glass transmitance, QE (λ) amount of being that α (λ), which is EVA transmitance, β (λ),
Sub- efficiency, G (λ) is spectral irradiance, they are all only related with wavelength X.
Fig. 3 shows the relationship of quantum efficiency and wavelength, and linear fitting can obtain: QE (λ)=4 × 10-17λ6-2×10-13
λ5+4×10-10λ4-4×10-7λ3+2×10-4λ2- 0.03 λ+0.98 (300nm < λ < 1100nm).
The product that total transmittance γ (λ) is EVA transmitance and glass transmitance is defined, Fig. 4 shows total transmittance and wave
Long relationship, linear fitting can obtain: γ (λ)=4 × 10-16λ6-2×10-12λ5+2×10-9λ4-2×10-6λ3+5×10-4λ2-
0.02 λ+78.93 (380nm < λ < 1015nm).
It is 3-2) influence for eliminating irradiation level and temperature, defines unit photogenerated current iph(λ), calculating formula is as follows:
Wherein, H is irradiation level, TcIt is component temperature.
3-3) calculate the relative error k of the unit photogenerated current under effective unit photogenerated current and standard test condition:
Wherein, iph-STC(λ) is the unit photogenerated current under standard spectrum AM1.5.
3-4) assume spectrum revisory coefficient KSIt is linear with relative error k, as effective unit photogenerated current iph(λ) etc.
Unit photogenerated current i under standard test conditionph-STCWhen (λ), i.e. k=0, KS=1；As effective unit photogenerated current iph(λ)
K when=0, i.e. k=-1S=0, it can thus be concluded that:
KS=1+k (11)
4) the impact factor coefficient of three revisory coefficient joint effect output powers, output power of photovoltaic module impact factor
K can be expressed as:
K=KT·KH·KS (12)
Embodiment
The District of Shanghai a certain moment is selected, the environment temperature T at the moment is measureda, wind speed VfAnd irradiation level H, it can calculate
Temperature revisory coefficient KT；
Real work electric current I is calculated according to formula (3) by the irradiation level H measured1(H), practical work is calculated according to formula (4)
Make voltage U1(H)；
Before maximum power point, by solar cell as constant-current source, standard test condition specified point operating current ISTC=
Isc-STC, then enable the irradiation level H of standard test conditionSTC=1000W/m2, substitute into formula (4) and find out standard test condition specified point work
Make voltage USTC, theoretical current I is obtained with formula (5) and formula (6)2(H) and theoretical voltage U2(H), low irradiation revision system is finally calculated
Number KH；
Practical photogenerated current I is calculated with the spectral irradiance at the spectrometer measurement moment, then with formula (8)ph(λ), then
Spectrum revisory coefficient K is obtained by formula (9), (10), (11)S.You can get it in this way Shanghai this when the power output factor inscribed
K, to be modified to component power.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of method for calculating output power of photovoltaic module impact factor based on meteorological condition, which is characterized in that including following
Step:
1) temperature revisory coefficient K is calculatedT:
KT=2.49-0.005Tc
Wherein, TcFor photovoltaic module temperature；
2) low irradiation revisory coefficient K is calculatedH:
Wherein, H is local irradiation level, I1(H) and U1(H) under any irradiation level of photovoltaic module real work electric current and work
Voltage；I2(H) and U2It (H) is the specified point electric current and specified point voltage under any irradiation level of photovoltaic module, the specified point electric current
Generated electric current and voltage when referring to the load of the external determination of photovoltaic module with specified point voltage；
3) spectrum revisory coefficient K is calculatedS:
KS=1+k
Wherein, k is the relative error of the unit photogenerated current under photovoltaic module effective unit photogenerated current and standard test condition；
4) output power of photovoltaic module impact factor K is calculated；The impact factor is temperature revisory coefficient, low irradiation revisory coefficient
With spectrum revisory coefficient, the product of three:
K=KT·KH·KS。
2. a kind of method that output power of photovoltaic module impact factor is calculated based on meteorological condition according to claim 1,
It is characterized in that, in the step 1), photovoltaic module temperature TcIt calculates as follows:
Wherein, TaFor environment temperature, ω is installation coefficient, VfFor wind speed.
3. a kind of method that output power of photovoltaic module impact factor is calculated based on meteorological condition according to claim 1,
It is characterized in that, the real work electric current under any irradiation level of photovoltaic module calculates as follows in the step 2):
I1(H)=1.2 × 10-4H
Real work voltage under any irradiation level of photovoltaic module is the inverse function of function shown in following formula:
Wherein, U is real work voltage.
4. a kind of method that output power of photovoltaic module impact factor is calculated based on meteorological condition according to claim 1,
It is characterized in that, the specified point electric current in the step 2), under any irradiation level of photovoltaic module are as follows:
Wherein, ISTCIt is standard test condition specified point electric current, HSTCIt is the irradiation level of standard test condition, value 1000W/m2；
Specified point voltage under any irradiation level of photovoltaic module are as follows:
U2(H)=USTC·ln(e+b(H-HSTC))
Wherein, USTCIt is standard test condition specified point voltage, e is the truth of a matter of constant natural logrithm, and b is penalty coefficient, and value is
0.005(W/m2)-1。
5. a kind of method that output power of photovoltaic module impact factor is calculated based on meteorological condition according to claim 1,
It is characterized in that, the unit photoproduction electricity in the step 3), under photovoltaic module effective unit photogenerated current and standard test condition
The calculating of the relative error k of stream is as follows:
Wherein, iph(λ) is unit photogenerated current, iph-STC(λ) is the unit photogenerated current under standard spectrum AM1.5；
Unit photogenerated current iphThe expression formula of (λ) are as follows:
Wherein, Iph(λ) is photogenerated current；
Photogenerated current IphThe expression formula of (λ) are as follows:
Wherein, h is planck constant, and c is the light velocity, and α (λ) is EVA transmitance, and β (λ) is glass transmitance, and QE (λ) is quantum effect
Rate, G (λ) is spectral irradiance.
6. a kind of method that output power of photovoltaic module impact factor is calculated based on meteorological condition according to claim 5,
It is characterized in that, the fitting expression of the quantum efficiency QE (λ) are as follows:
QE (λ)=4 × 10-17λ6-2×10-13λ5+4×10-10λ4-4×10-7λ3+2×10-4λ 2-0.03 λ+0.98,300nm < λ
< 1100nm；
Define the product that total transmittance γ (λ) is EVA transmitance α (λ) and glass transmitance β (λ), fitting expression are as follows:
γ (λ)=4 × 10-16 λ 6-2 × 10-12 λ5+2×10-9λ4-2×10-6λ3+5×10-4λ2- 0.02 λ+78.93,380nm
< λ < 1015nm.
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| CN111414582A (en) * | 2020-03-12 | 2020-07-14 | 广西电网有限责任公司 | Photovoltaic theoretical power calculation method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008083971A (en) * | 2006-09-27 | 2008-04-10 | Toyohashi Univ Of Technology | Method for simulating system having solar generator/wind generator/cogenerator |
| CN103390116A (en) * | 2013-08-07 | 2013-11-13 | 华北电力大学（保定） | Method for predicting electricity generation power of photovoltaic power station in step-by-step way |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008083971A (en) * | 2006-09-27 | 2008-04-10 | Toyohashi Univ Of Technology | Method for simulating system having solar generator/wind generator/cogenerator |
| CN103390116A (en) * | 2013-08-07 | 2013-11-13 | 华北电力大学（保定） | Method for predicting electricity generation power of photovoltaic power station in step-by-step way |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111414582A (en) * | 2020-03-12 | 2020-07-14 | 广西电网有限责任公司 | Photovoltaic theoretical power calculation method, device, equipment and storage medium |
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