CN106372350B  Assess the calculation method that twodimentional condenser influences concentration photovoltaic system electrical property  Google Patents
Assess the calculation method that twodimentional condenser influences concentration photovoltaic system electrical property Download PDFInfo
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 CN106372350B CN106372350B CN201610817461.7A CN201610817461A CN106372350B CN 106372350 B CN106372350 B CN 106372350B CN 201610817461 A CN201610817461 A CN 201610817461A CN 106372350 B CN106372350 B CN 106372350B
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Abstract
Assess the calculation method that twodimentional condenser influences concentration photovoltaic system electrical property, for the solar concentration photovoltaic system using twodimentional condenser, it is discrete in the progress of the direction of crystal silicon photovoltaic cell uneven distribution along Photospot solar stream, form multiple discrete units, according to the equivalent circuit of polysilicon photovoltaic cells, form the twodimentional multiple diode computation model of multiple discrete unit parallel connections, discrete twodimentional Photospot solar circulation is changed to short circuit current and is correspondingly arranged into the discrete unit constantcurrent source of twodimentional multiple diode computation model, then graphical programs are established using iterative method or Multisim software and calculates twodimentional concentrating photovoltaic photothermal system output electric energy, to realize the influence for assessing the twodimentional condenser optically focused uniformity to concentration photovoltaic system.
Description
Technical field
The invention belongs to solar concentrating photovoltaic research field, it is related to a kind of twodimentional condenser of assessment to concentration photovoltaic system
The calculation method that electrical property influences.
Background technique
In solar concentration photovoltaic system, condenser optics performance has a great impact to system electrical property, condenser
Optical property include that condenser optics efficiency and the condenser convergence aspect of the solar energy stream uniformity two, optical efficiency characterization are poly
" amount " of light device optically focused, and " matter " of optically focused uniformity characterization condenser optically focused, the often condenser of same optical efficiency, by
It is different in its optically focused uniformity, enable the output electric property of system different；Due to the presence of the optically focused uniformity, excessively high office
In the irradiation to photovoltaic cell of portion's solar energy stream, so that photovoltaic cell local current is excessively high, lead to photovoltaic cell local I^{2}R loss increases
Add, so that the electric energy that photovoltaic cell generates is consumed in local excessive, to reduce the electrical property of entire concentration photovoltaic system, separately
Outside, it since excessively high local solar energy stream irradiates, so that resistance value is relatively excessively high in the area for photovoltaic cell, is not able to satisfy
The work of conveying electric energy is undertaken under corresponding high current density, and then leads to photovoltaic cell local I^{2}R loss increases, to reduce
The electrical property of entire concentration photovoltaic system.In consideration of it, being needed for the solar concentration photovoltaic system using twodimentional condenser
A kind of method calculates and assesses influence of the Photospot solar stream uniformity to system electrical property.
Summary of the invention
For the solar concentration photovoltaic system using twodimentional condenser, it is an object of that present invention to provide a kind of assessment two dimensions
The calculation method that condenser influences concentration photovoltaic system electrical property.
To achieve the above object, the technical solution adopted by the present invention are as follows:
Assess the calculation method that twodimentional condenser influences concentration photovoltaic system electrical property, comprising the following steps:
1) it connects to form crystal silicon photovoltaic cell group by welding between several monomer crystal silicon photovoltaic cells, in crystalline silicon
Xoy coordinate system is established on photovoltaic cell group lighting surface, monomer crystal silicon photovoltaic cell is connected in series along the yaxis direction, serial number
For m；Welding along the yaxis direction has been correspondingly formed welding circuit, amounts to l welding circuit, the equivalent electricity of each welding circuit
Resistance is R_{h,s}；
2) at crystal silicon photovoltaic cell group both ends, l welding circuit connection is got up by convergent belt, convergent belt includes adjacent
The convergent belt of convergent belt and external circuits between welding forms convergent belt circuit, the convergent belt between adjacent welding
Equivalent resistance is R_{hl,s}, the equivalent resistance of the convergent belt of external circuits is R_{hl,o}；
3) twodimentional condenser prefocus stream is on crystal silicon photovoltaic cell group lighting surface, along the optically focused energyflux density of yaxis
It is evenly distributed, is unevenly distributed along the optically focused energyflux density of xaxis；
4) crystal silicon photovoltaic cell group is discrete along the xaxis direction, form n discrete unit, the crystalline substance of each discrete unit
Body Silicon photrouics group series resistance is R_{s,i}, crystal silicon photovoltaic cell group is discrete along the yaxis direction；
5) according to crystal silicon photovoltaic cell equivalent circuit, for a discrete unit in step 4), formation one is discrete
Unit equivalent circuit, a discrete unit equivalent circuit include: discrete unit diode, discrete unit constantcurrent source I_{sc,i}And from
The crystal silicon photovoltaic cell group series resistance R of throwaway member_{s,i}, the connection type of discrete unit equivalent circuit are as follows: two pole of discrete unit
Manage it is parallel with one another with discrete unit constantcurrent source, then with the crystal silicon photovoltaic cell group series resistance R of discrete unit_{s,i}Series connection；
6) n discrete unit is formed into n discrete unit equivalent circuit according to the connection type in step 5), according to parallel connection
Mode be connected with each other this n discrete unit equivalent circuit；
7) on the basis of the n discrete unit equivalent circuit in step 6) is parallel with one another, corresponding welding and convergent belt exist
Polysilicon photovoltaic cells group present position, serial or parallel connection enter the equivalent resistance R of welding circuit_{h,s}, confluence between adjacent welding
The equivalent resistance R of band_{hl,s}With the equivalent resistance R of the convergent belt of external circuits_{hl,o}；
The equivalent resistance R of welding circuit_{h,s}The equivalent resistance R of convergent belt between adjacent welding_{hl,s}After series connection, then with
The equivalent resistance R of welding circuit_{h,s}After parallel connection, finally with the equivalent resistance R of the convergent belt of external circuits_{hl,o}Series connection；
8) on the basis of step 7), IV analyzer is connected into, forms a closed circuit, it is poly to complete twodimentional condenser
The twodimentional multiple diode equivalent circuit of crystal silicon photovoltaic cell group under light；
9) for the discrete unit diode of the discrete unit equivalent circuit in step 5), it is antithat discrete unit diode is set
To saturation current I_{0,i}, discrete unit Diode Ideality Factor A_{i}And discrete unit diode temperature T_{i}:
10) to the discrete unit constantcurrent source I in the discrete unit equivalent circuit in step 5)_{sc,i}Setting:
11) twodimentional concentration photovoltaic system output electric energy is calculated, completes twodimentional condenser to concentration photovoltaic system electrical property
Assessment.
A further improvement of the present invention lies in that reversed saturation electricity of the discrete unit diode at certain temperature T in step 9)
Flow I_{0,i_T}, it is equal to monomer crystal silicon photovoltaic cell reverse saturation current I at temperature T_{0_T}With the quotient of discrete unit quantity n；
Discrete unit Diode Ideality Factor A_{i}, it is equal to the sum of m monomer crystal silicon photovoltaic cell ideal factor A；
Discrete unit diode temperature T_{i}For the mean temperature of the crystal silicon photovoltaic cell group of the discrete unit.
A further improvement of the present invention lies in that for the discrete unit constant current in discrete unit equivalent circuit in step 10)
Source I_{sc}, detailed process is as follows for the setting of i:
At standard conditions, the condition of the status of criterion are as follows: total solar irradiance G_{t,stco}=1000W/m^{2}, crystalline silicon photovoltaic
Battery temperature T_{stco}=25 DEG C；Monomer crystal silicon photovoltaic cell short circuit current is I_{sc,stco}；Monomer crystal silicon photovoltaic cell short circuit electricity
The temperature coefficient of stream is α；
Total solar irradiance of the twodimentional condenser Photospot solar stream in step 5) on the lighting surface of discrete unit be
G_{t,i}, discrete unit diode temperature is T_{i}；
Discrete unit constantcurrent source I_{sc,i}Value calculate and be arranged according to following formula:
I_{sc,i}=I_{sc,stco}G_{t,i}/G_{t,stco}(1+α(T_{i}T_{stco}))。
A further improvement of the present invention lies in that being calculated by the following method in step 11): utilizing voltampere of characteristic diode
Mathematic(al) representation and Kirchhoff's law simultaneously solve twodimentional concentration photovoltaic system output electric energy by Newton iteration method, or utilize
Multisim software is established graphical programs and is calculated.
Compared with prior art, the invention has the following beneficial effects: utilize method of the invention, it will be able to assess nonequal
Influence of the evenness to system output electric energy；Because when hot spot is uniform, output electric energy is a value, and hot spot is uneven, output
Be another value, this method that can propose through the invention this when is assessed, when nonuniform
Output electric property can with it is uniform when output electric property can comparison, to evaluate the nonhomogeneous influence to electrical property.Therefore certain
It wants discrete, if not discrete, influence of the nonuniformity to electrical property cannot be evaluated.Because not discrete, it is nonhomogeneous with it is uniform
Hot spot, be all identical energy value, the influence for evaluating Irregular facula to electrical property of just having no idea this when.This hair
The bright solar concentration photovoltaic system for using twodimentional condenser, along Photospot solar stream in crystal silicon photovoltaic cell unevenness
The direction of even distribution carries out discrete, forms multiple discrete units, according to the equivalent circuit of crystal silicon photovoltaic cell, formed it is multiple from
The twodimentional multiple diode equivalent circuit of crystal silicon photovoltaic cell group under throwaway member twodimentional condenser optically focused in parallel, will be discrete
The crystal silicon photovoltaic cell group that twodimentional Photospot solar circulation is changed to short circuit current and is correspondingly arranged under twodimentional condenser optically focused
Twodimentional multiple diode equivalent circuit discrete unit constantcurrent source in, figure is then established using iterative method or Multisim software
Shape program calculates twodimentional concentration photovoltaic system output electric energy, to realize the twodimentional condenser optically focused uniformity of assessment to optically focused
The influence of photovoltaic system.The present invention provides a kind of concentration photovoltaic system two dimension multiple diode computation model, and it is poly can to assess two dimension
The light device optically focused uniformity influences concentration photovoltaic system electrical property.
Detailed description of the invention
Fig. 1 is the crystal silicon photovoltaic cell group and discrete way schematic diagram in the case of twodimentional condenser optically focused.
Fig. 2 is the twodimentional multiple diode equivalent circuit of the crystal silicon photovoltaic cell group under twodimentional condenser optically focused.
Specific embodiment
The present invention will be further described below with reference to the drawings.
Calculating step of the invention are as follows:
1) it referring to Fig. 1, connects to form crystal silicon photovoltaic cell group by welding between several monomer crystal silicon photovoltaic cells,
Xoy coordinate system is established on crystal silicon photovoltaic cell group lighting surface, monomer crystal silicon photovoltaic cell is connected in series along the yaxis direction,
Serial number is m；Welding along the yaxis direction has been correspondingly formed welding circuit, amounts to l welding circuit, each welding circuit
Equivalent resistance be R_{h,s}；
2) at crystal silicon photovoltaic cell group both ends, l welding circuit connection is got up by convergent belt, convergent belt includes adjacent
The convergent belt of convergent belt and external circuits between welding forms convergent belt circuit, the convergent belt between adjacent welding
Equivalent resistance is R_{hl,s}, the equivalent resistance of the convergent belt of external circuits is R_{hl,o}；
3) twodimentional condenser prefocus stream is on crystal silicon photovoltaic cell group lighting surface, along the optically focused energyflux density of yaxis
It is evenly distributed, is unevenly distributed along the optically focused energyflux density of xaxis；
4) crystal silicon photovoltaic cell group is discrete along the xaxis direction, form n discrete unit, the crystalline substance of each discrete unit
Body Silicon photrouics group series resistance is R_{s,i}, crystal silicon photovoltaic cell group is discrete along the yaxis direction；
5) referring to fig. 2, a discrete unit in step 4) is formed according to crystal silicon photovoltaic cell equivalent circuit
One discrete unit equivalent circuit, a discrete unit equivalent circuit include: discrete unit diode, discrete unit constantcurrent source
I_{sc,i}And the crystal silicon photovoltaic cell group series resistance R of discrete unit_{s,i}, the connection type of discrete unit equivalent circuit are as follows: from
Dissipate cell diodes and discrete unit constantcurrent source it is parallel with one another, then with the crystal silicon photovoltaic cell group series resistance of discrete unit
R_{s,i}Series connection；
6) n discrete unit is formed into n discrete unit equivalent circuit according to the connection type in step 5), according to parallel connection
Mode be connected with each other this n discrete unit equivalent circuit；
7) on the basis of the n discrete unit equivalent circuit in step 6) is parallel with one another, corresponding welding and convergent belt exist
Polysilicon photovoltaic cells group present position, serial or parallel connection enter the equivalent resistance R of welding circuit_{h,s}, confluence between adjacent welding
The equivalent resistance R of band_{hl,s}With the equivalent resistance R of the convergent belt of external circuits_{hl,o}；
The equivalent resistance R of welding circuit_{h,s}The equivalent resistance R of convergent belt between adjacent welding_{hl,s}After series connection, then with
The equivalent resistance R of welding circuit_{h,s}After parallel connection, finally with the equivalent resistance R of the convergent belt of external circuits_{hl,o}Series connection；
8) on the basis of step 7), IV analyzer is connected into, forms a closed circuit, it is poly to complete twodimentional condenser
The twodimentional multiple diode equivalent circuit of crystal silicon photovoltaic cell group under light；
9) for the discrete unit diode of the discrete unit equivalent circuit in step 5), it is antithat discrete unit diode is set
To saturation current I_{0,i}, discrete unit Diode Ideality Factor A_{i}And discrete unit diode temperature T_{i}:
Reverse saturation current I of the discrete unit diode at certain temperature T_{0,i_T}, it is equal to monomer crystal silicon photovoltaic cell and exists
Reverse saturation current I under temperature T_{0_T}With the quotient of discrete unit quantity n, i.e. I_{0,i_T}=I_{0_T}/n；
Discrete unit Diode Ideality Factor A_{i}, it is equal to the sum of m monomer crystal silicon photovoltaic cell ideal factor A, i.e. A_{i}=
mA；
Discrete unit diode temperature T_{i}For the mean temperature of the crystal silicon photovoltaic cell group of the discrete unit；
10) to the discrete unit constantcurrent source I in the discrete unit equivalent circuit in step 5)_{sc,i}Setting:
(total solar irradiance G at standard conditions_{t,stco}=1000W/m^{2}, crystal silicon photovoltaic cell temperature T_{stco}=25
DEG C), monomer crystal silicon photovoltaic cell short circuit current is I_{sc,stco}；The temperature coefficient of monomer crystal silicon photovoltaic cell short circuit current is
α；
Total solar irradiance of the twodimentional condenser Photospot solar stream in step 5) on the lighting surface of discrete unit be
G_{t,i}, discrete unit diode temperature is T_{i}；
Discrete unit constantcurrent source I_{sc,i}Value calculate and be arranged according to following formula:
I_{sc,i}=I_{sc,stco}G_{t,i}/G_{t,stco}(1+α(T_{i}T_{stco}))
11) using the mathematic(al) representation of voltampere of characteristic diode and Kirchhoff's law and two are solved by Newton iteration method
It ties up concentration photovoltaic system and exports electric energy, or establish graphical programs using Multisim software and calculate twodimentional concentration photovoltaic system
Electric energy is exported, completes twodimentional condenser to concentration photovoltaic system electrical performance evaluation.
Claims (3)
1. assessing the calculation method that twodimentional condenser influences concentration photovoltaic system electrical property, which is characterized in that including following step
It is rapid:
1) it connects to form crystal silicon photovoltaic cell group by welding between several monomer crystal silicon photovoltaic cells, in crystalline silicon photovoltaic
Xoy coordinate system is established on battery pack lighting surface, monomer crystal silicon photovoltaic cell is connected in series along the yaxis direction, serial number m；
Welding along the yaxis direction has been correspondingly formed welding circuit, amounts to l welding circuit, and the equivalent resistance of each welding circuit is
R_{h,s}；
2) at crystal silicon photovoltaic cell group both ends, l welding circuit connection is got up by convergent belt, convergent belt includes adjacent welding
Between convergent belt and external circuits convergent belt, form convergent belt circuit, the convergent belt between adjacent welding it is equivalent
Resistance is R_{hl,s}, the equivalent resistance of the convergent belt of external circuits is R_{hl,o}；
3) twodimentional condenser prefocus stream is on crystal silicon photovoltaic cell group lighting surface, along the optically focused fluxdensity distribution of yaxis
Uniformly, it is unevenly distributed along the optically focused energyflux density of xaxis；
4) crystal silicon photovoltaic cell group is discrete along the xaxis direction, form n discrete unit, the crystalline silicon of each discrete unit
Photovoltaic cell group series resistance is R_{s,i}, crystal silicon photovoltaic cell group is discrete along the yaxis direction；
5) discrete unit is formed for a discrete unit in step 4) according to crystal silicon photovoltaic cell equivalent circuit
Equivalent circuit, a discrete unit equivalent circuit include: discrete unit diode, discrete unit constantcurrent source I_{sc,i}And discrete list
The crystal silicon photovoltaic cell group series resistance R of member_{s,i}, the connection type of discrete unit equivalent circuit are as follows: discrete unit diode with
Discrete unit constantcurrent source is parallel with one another, then with the crystal silicon photovoltaic cell group series resistance R of discrete unit_{s,i}Series connection；
6) n discrete unit is formed into n discrete unit equivalent circuit according to the connection type in step 5), according to side in parallel
Formula is connected with each other this n discrete unit equivalent circuit；
7) on the basis of the n discrete unit equivalent circuit in step 6) is parallel with one another, corresponding welding and convergent belt are in polycrystalline
Silicon photrouics group present position, serial or parallel connection enter the equivalent resistance R of welding circuit_{h,s}, convergent belt between adjacent welding
Equivalent resistance R_{hl,s}With the equivalent resistance R of the convergent belt of external circuits_{hl,o}；
The equivalent resistance R of welding circuit_{h,s}The equivalent resistance R of convergent belt between adjacent welding_{hl,s}After series connection, then it is electric with welding
The equivalent resistance R on road_{h,s}After parallel connection, finally with the equivalent resistance R of the convergent belt of external circuits_{hl,o}Series connection；
8) on the basis of step 7), IV analyzer is connected into, forms a closed circuit, is completed under twodimentional condenser optically focused
Crystal silicon photovoltaic cell group twodimentional multiple diode equivalent circuit；
9) for the discrete unit diode of the discrete unit equivalent circuit in step 5), discrete unit diode is set and is reversely satisfied
With electric current I_{o,i}, discrete unit Diode Ideality Factor A_{i}And discrete unit diode temperature T_{i}:
10) to the discrete unit constantcurrent source I in the discrete unit equivalent circuit in step 5)_{sc,i}Setting:
11) twodimentional concentration photovoltaic system output electric energy is calculated, completes twodimentional condenser to concentration photovoltaic system electrical performance evaluation；
Wherein, for the discrete unit constantcurrent source I in discrete unit equivalent circuit in step 10)_{sc,i}Setting detailed process such as
Under:
At standard conditions, the condition of the status of criterion are as follows: total solar irradiance G_{t,stco}=1000W/m^{2}, crystal silicon photovoltaic cell temperature
Spend T_{stco}=25 DEG C；Monomer crystal silicon photovoltaic cell short circuit current is I_{sc,stco}；The temperature of monomer crystal silicon photovoltaic cell short circuit current
Degree coefficient is α；
Total solar irradiance of the twodimentional condenser Photospot solar stream in step 5) on the lighting surface of discrete unit is G_{t,i}, from
Throwaway member diode temperature is T_{i}；
Discrete unit constantcurrent source I_{sc,i}Value calculate and be arranged according to following formula:
2. the calculation method according to claim 1 assessed twodimentional condenser and concentration photovoltaic system electrical property is influenced,
It is characterized in that, reverse saturation current I of the discrete unit diode at certain temperature T in step 9)_{o,i_T}, it is equal to monomer crystalline silicon light
Lie prostrate battery reverse saturation current I at temperature T_{o_T}With the quotient of discrete unit quantity n；
Discrete unit Diode Ideality Factor A_{i}, it is equal to the sum of m monomer crystal silicon photovoltaic cell ideal factor A；
Discrete unit diode temperature T_{i}For the mean temperature of the crystal silicon photovoltaic cell group of the discrete unit.
3. the calculation method according to claim 1 assessed twodimentional condenser and concentration photovoltaic system electrical property is influenced,
It is characterized in that, is calculated by the following method in step 11): is fixed using the mathematic(al) representation and kirchhoff of voltampere of characteristic diode
It restrains and passes through Newton iteration method and solve twodimentional concentration photovoltaic system output electric energy, or establish graphical journey using Multisim software
Sequence is calculated.
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CN103984840A (en) *  20140605  20140813  湖北工业大学  Modeling method of concentrating solar photovoltaic power generation system 
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