CN106452354A - Verification method for electricity generation performance of grid-connected type photovoltaic power station - Google Patents
Verification method for electricity generation performance of grid-connected type photovoltaic power station Download PDFInfo
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- 238000012795 verification Methods 0.000 title claims abstract description 15
- 230000005611 electricity Effects 0.000 title claims abstract description 10
- 238000010248 power generation Methods 0.000 claims abstract description 19
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- 238000013461 design Methods 0.000 claims abstract description 8
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a verification method for electricity generation performance of a grid-connected type photovoltaic power station. The verification method comprises the steps of collecting solar irradiance G of a light-accepting surface of a solar photovoltaic module and a temperature T of a photovoltaic cell in the photovoltaic module at intervals; then by combination of total power PAS of the photovoltaic power station module, a power irradiance coefficient C1 and a power temperature coefficient C2 of the solar photovoltaic module, a direct current augmenting factor kd, inverter efficiency <eta>INV, and an attenuation coefficient C3 of the solar photovoltaic module, calculating instantaneous power generation power P according to a formula that P is equal to PAS*[1+(G-1)*C1]*[1+(T-25)*C2]*kd*<eta>INV*C3; enabling the instantaneous power generation power P to be multiplied with data collection interval time separately, and summing to obtain theoretical measurement and calculation electric energy production within a certain time; and next, enabling the theoretical measurement and calculation electric energy production to be compared with actual electric energy production data so as to verify and determine whether the electricity generation performance of the grid-connected type photovoltaic power station satisfies requirements of contracts, design or regulations or not. The verification method can be widely applied to construction quality verification and operational management of grid-connected type photovoltaic power station projects.
Description
Technical field
The present invention relates to solar energy power generating field, the especially checking of parallel networking type solar photovoltaic power station power generation performance
Method.
Background technology
With energy resources supply be becoming tight day, ecological deterioration increasingly sharpens, country carry out energy-saving and emission-reduction dynamics continuous
Increase, parallel networking type solar photovoltaic power station has obtained Preliminary Applications at home.
If solar irradiation can be converted into unidirectional current by dry tablet solar photovoltaic assembly by parallel networking type photovoltaic power station, through grid-connected
Inverter is connected to the grid after changing into alternating current.The power generation performance of parallel networking type photovoltaic power station, is the major technique ginseng of photovoltaic plant
Number, at present can only in standard test condition, (standard test condition includes with the monolithic solar photovoltaic assembly for being adopted：Sun spoke
Illumination 1000W/m2, internal 25 DEG C of the photovoltaic battery temperature of solar photovoltaic assembly, air quality AM1.5) under peak power total
With representing.As standard test condition can only be indoor by strictly controlling and could be formed in experiment, it is impossible to by photovoltaic plant
Under laboratory is put into standard test condition integrally verify solar irradiance, solar energy in its power generation performance, and practical application
The ambient parameters such as the internal photovoltaic battery temperature of photovoltaic module are continually changing so that the generating work(of each time point of parallel networking type photovoltaic power station
Rate is all in change, thus under standard test condition, the summation of peak power represents photovoltaic plant only with solar photovoltaic assembly
, there is larger deficiency in the method for power generation performance, it is impossible to effectively represent parallel networking type photovoltaic power station under the environmental condition being continually changing
Power generation performance, it is impossible to effectively checking determines whether actual power performance meets the requirement of contract, design or regulation, thus makes item
Quantitative basis in terms of mesh examination shortage power generation performance, are unfavorable for ensureing the construction quality of parallel networking type photovoltaic power station engineering, unfavorable
In the abnormal conditions for finding power station operation in time, it is unfavorable for the application of parallel networking type photovoltaic power station.
Content of the invention
The technical problem to be solved is：For cannot effectively represent that parallel networking type photovoltaic power station is constantly becoming at present
Power generation performance under the environmental condition of change, cannot effectively verify whether determination actual power performance meets contract, design or regulation
Requirement problem, provide a kind of new verification method, by calculating the generated energy under the conditions of varying environment, and and actual power
Amount is contrasted, to determine whether photovoltaic plant actual power performance meets the requirement of contract, design or regulation.
For solving above-mentioned technical problem, the technical solution used in the present invention is：A kind of described parallel networking type photovoltaic power station is sent out
The verification method of electrical property, by solar irradiance G of certain frequency collection solar photovoltaic assembly sensitive surface, photovoltaic group
Temperature T of the internal photovoltaic cell of part, in conjunction with photovoltaic power station component general power PAS, the power irradiance degree system of solar photovoltaic assembly
Number C1 and temperature power coefficient C2 and direct current augmenting factor kd, inverter efficiency η INV, the decay system of solar photovoltaic assembly
Number C3, calculates instantaneous sending out according to formula P=PAS × [1+ (G-1) × C1] × [1+ (T-25) × C2] × kd × η INV × C3
Electrical power P, and be multiplied with the time of data acquisition intervals respectively and sue for peace, the theoretical calculation generated energy of a period of time is drawn, then
The theoretical calculation generated energy is contrasted with the actual power generation data for gathering from combining inverter, grid-connected so as to verify determination
Whether the power generation performance of type photovoltaic plant reaches the requirement of contract, design or regulation.
Implication in above-mentioned formula representated by each symbol is as follows：
P instantaneous electric power measuring and calculating value, i.e., using the parallel networking type photovoltaic electricity of maximum power point tracking technology (MPPT)
Stand measuring and calculating value of a certain time point to electrical network output, unit kW；
PAS solar photovoltaic assembly general power, i.e., solar photovoltaic assembly is in standard test condition (solar irradiance
For 1000W/m2, the internal photovoltaic battery temperature of solar photovoltaic assembly is 25 DEG C, AM1.5) under peak power summation, unit
kWp.The method of determination is：The photovoltaic module for being adopted is multiplied by total tablet number per piece peak power under standard test condition；
The solar irradiance received by a certain time point photovoltaic module sensitive surface of G, changes with weather condition, unit
For kW/m2；
C1 power irradiance degree coefficient, i.e. solar photovoltaic assembly peak power becomes with the change of solar irradiance
The percentage ratio of change, different according to solar photovoltaic assembly performance difference, unit is %/kW m-2；Which can be by photovoltaic
Component manufacturer provides, and also can be determined by test.Test method is：Extract from the solar photovoltaic assembly of same type a piece of
Or multi-disc sample, with the A level solar simulator for meeting national standard in test chamber, adjust solar photovoltaic assembly interior lights
Volt battery temperature to 25 DEG C and makes air quality reach AM1.5, makes simulated solar light irradiance from 200W/m2Gradually change to
1200W/m2, and test simulation sunlight difference irradiance under photovoltaic module maximum output, draw maximum output
The curve for changing as simulated solar irradiance changes, highest irradiance and minimum irradiance most middle a little on, take
The slope of maximum output, i.e. power irradiance degree coefficient C1；
The temperature of the internal photovoltaic cell of a certain time point photovoltaic module of T, is generated heat by ambient temperature and self generating
Impact and change, unit be DEG C；
C2 temperature power coefficient, i.e. solar photovoltaic assembly peak power are with the internal photovoltaic cell temperature of photovoltaic module
The change of degree and percentage change, different according to solar photovoltaic assembly performance and different, unit for %/DEG C；Power temperature
Coefficient can be provided by solar photovoltaic assembly manufacturer, also can be determined by test.Test method is：Solar energy from same type
One or more pieces samples are extracted in photovoltaic module, with the A level solar simulator for meeting national standard in test chamber, adjust mould
It is 1000W/m to intend sunlight irradiation degree2And make air quality reach AM1.5, make the temperature of the internal photovoltaic cell of photovoltaic module from
It is not less than 40 DEG C to gradually change to not higher than 10 DEG C, the maximum output that tests under different temperatures, draws maximum output
The curve for changing with temperature change, maximum temperature and minimum temperature most middle a little on, take maximum output
Slope, i.e. temperature power coefficient C2；
Kd direct current augmenting factor, the contamination containing solar photovoltaic assembly surface, back flow prevention element and power transmission line
The correction of path loss consumption；Approximation 0.8 or so is typically can use, also can be determined by test.Test method is：Parallel networking type photovoltaic power station
It is made up of some electric units, each electric unit is made up of some solar photovoltaic assemblies；Normal in parallel networking type photovoltaic power station
In the case of work, select a certain electric unit and measure the output of its DC distribution outfan；Reselection is another electrically
Certain piece solar photovoltaic assembly in unit, cleans its surface, and measures the piece solar energy while aforementioned measurement is carried out
The output of volt component, by the former divided by the latter and the solar photovoltaic assembly included by an electric unit piece number it
Product, as direct current augmenting factor；
η INV inverter efficiency, is the unidirectional current that photovoltaic module is produced is converted to inverter alternating current efficiency,
By the offer of inverter life manufacturer；
The attenuation quotient of C3 solar photovoltaic assembly, i.e. solar photovoltaic assembly are declined with the passage of use time
After subtracting, the ratio of peak power and peak power when dispatching from the factory under standard testing state, by solar photovoltaic assembly, manufacturer carries
For.
Above-mentioned solar irradiance G by irradiance sensor by the frequency collection for being not less than 5 minutes 1 time interval time, and
And irradiance sensor is on the same plane of solar photovoltaic assembly sensitive surface.
The internal photovoltaic battery temperature T of above-mentioned photovoltaic module is by temperature sensor by being not less than 5 minutes 1 time interval time
Frequency collection, and temperature sensor is packaged in solar photovoltaic assembly.Temperature sensor can be close in photovoltaic module
The back of portion's photovoltaic cell.
The invention has the beneficial effects as follows：Effectively can be calculated in a period of time under actual environmental conditions using said method
The theoretical generated energy of photovoltaic plant, and contrasted with actual power generation.Determination power station can be verified in project final acceptance of construction
Actual power performance whether reach the requirement of contract, design or regulation, advantageously ensure that building for parallel networking type photovoltaic power station engineering
If quality；It has also been discovered that power station problem present in running, so as to timely Diagnosis of Primary because and maintenance maintenance, be conducive to
The operational management of parallel networking type photovoltaic power station.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme is clearly and completely described, it is clear that institute
The embodiment of description is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment party obtained under the premise of creative work is not made by those of ordinary skill in the art
Formula, belongs to the scope of protection of the invention.
Embodiment 1：Parallel networking type photovoltaic power station of solar photovoltaic assembly general power PAS for 28kWp is built, using monocrystal silicon
175Wp solar photovoltaic assembly.
1st, measurement determines power irradiance degree coefficient C1, temperature power coefficient C2, direct current augmenting factor kd and photovoltaic
The attenuation quotient C3 of component：
One or more pieces samples are extracted from the solar photovoltaic assembly of same type, with meeting national standard in test chamber
A level solar simulator, adjusting the internal photovoltaic battery temperature of solar photovoltaic assembly to 25 DEG C and reaches air quality
AM1.5, makes simulated solar light irradiance from 200W/m2Gradually change to 1200W/m2, and test simulation sunlight difference irradiance
The maximum output of lower photovoltaic module, draws the curve that maximum output changes with the change of simulated solar irradiance,
Highest irradiance and minimum irradiance most middle a little on, take the slope of maximum output, i.e. power irradiance degree coefficient
C1 is 105.26%/kW m-2.
One or more pieces samples are extracted from the solar photovoltaic assembly of same type, with meeting national standard in test chamber
A level solar simulator, it is 1000W/m to adjust simulated solar light irradiance2And make air quality reach AM1.5, make photovoltaic
The temperature of component internal photovoltaic cell is gradually changed to not higher than 10 DEG C from being not less than 40 DEG C, and the peak value that tests under different temperatures is defeated
Go out power, the curve that maximum output changes with temperature change is drawn, in maximum temperature and minimum temperature most middle
On point, take the slope of maximum output, i.e. temperature power coefficient C2 for -0.45%/DEG C.
Direct current augmenting factor, in the case of grid-connected power station normal work, selects a certain electric unit and measures its direct current
Output on power distribution cabinet, selects certain piece solar photovoltaic assembly of another electric unit, cleans its surface, and before carrying out
While stating measurement, the output of the piece solar photovoltaic assembly is measured, by the former divided by the latter and an electric unit institute
Including solar photovoltaic assembly piece number product, as direct current augmenting factor kd be 0.82.
The attenuation quotient of solar photovoltaic assembly, i.e., the degree that photovoltaic module is decayed with the growth of use time, too
Sun energy photovoltaic module manufacturer provides parameter and is：Photovoltaic module dispatch from the factory the 1st year for the 0.95, the 2nd year to the 5th year be the 0.93, the 6th to
It the 0.85, the 16th to the 25th year is 0.80 that 10th year for the 0.9, the 11st to the 15th year was.Calculated by the 1st year 0.95.
The 2nd, the sensor of collection solar irradiance G is installed on the same clinoplain of solar photovoltaic assembly sensitive surface
On, the sensor of internal for collection photovoltaic module photovoltaic battery temperature T is packaged in solar photovoltaic assembly and is close to photovoltaic
The back of component internal photovoltaic cell.
3rd, determine solar photovoltaic assembly general power PAS, by the solar photovoltaic assembly for being adopted in standard test condition
Under be multiplied by total tablet number, i.e. 175 × 160=28kWp per piece peak power.
4th, determine inverter efficiency η INV, be the effect that the unidirectional current that photovoltaic module is produced is converted to inverter alternating current
Rate, it is 0.95 that inverter life manufacturer provides η INV.
The 5th, monitoring software and data acquisition unit are installed and are calculated, by each sensor, combining inverter and monitoring equipment phase
Even, and Usage data collection software gather solar irradiance G, photovoltaic battery temperature T and reality inside photovoltaic module per 3 minutes
Border generated energy data, and press formula P=28 × [1+ (G-1) × 105.26%] × [1+ (T-25) × -0.45] × 0.82 ×
0.95 × 0.95, the product of the instantaneous electric power P of each time point and interval time 3 minutes is mutually added up, measuring and calculating can be added up and sent out
Electricity.Solar irradiance G, component internal photovoltaic cells temperature T, theoretical the accumulative total of generating electricity and actual the accumulative total of generating electricity all exist
Show on display, in order to observe.
6th, through the data collection of continuous 7 days, theoretical the accumulative total of generating electricity is that 560.8kWh, actual power generation is
585.2kWh.Both are contrasted, actual power generation is the 104.35% of theoretical generated energy, it may be determined that the parallel networking type photovoltaic
The power generation performance in power station meets design requirement.
The better embodiment of the present invention is the foregoing is only, not in order to limit the present invention, all the present invention's
Within spirit and principle, any modification, equivalent substitution and improvement that is made etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of verification method of parallel networking type photovoltaic power station power generation performance, it is characterised in that：The certain frequency collection sun is pressed first
Temperature T of the internal photovoltaic cell of solar irradiance G of energy photovoltaic module sensitive surface, solar photovoltaic assembly, in conjunction with photovoltaic plant
Component general power PAS, the power irradiance degree coefficient C1 of solar photovoltaic assembly and temperature power coefficient C2 and direct current correction system
Number kd, inverter efficiency η INV, the attenuation quotient C3 of solar photovoltaic assembly, according to formula P=PAS × [1+ (G-1) × C1]
× [1+ (T-25) × C2] × kd × η INV × C3 calculates instantaneous electric power P, and the time with data acquisition intervals respectively
Be multiplied and sue for peace, draw the theoretical calculation generated energy of a period of time, then by the theoretical calculation generated energy with adopt from combining inverter
The actual power generation data of collection are contrasted, so as to verify determine parallel networking type photovoltaic power station power generation performance whether meet contract,
Design or the requirement of regulation.Implication in above-mentioned formula representated by each symbol is as follows：P instantaneous electric power measuring and calculating value,
I.e. using maximum power point tracking technology measuring and calculating value from a certain time point of parallel networking type photovoltaic power station to electrical network output, unit
kW；(solar irradiance is in standard test condition for PAS solar photovoltaic assembly general power, i.e. solar photovoltaic assembly
1000W/m2, the internal photovoltaic battery temperature of solar photovoltaic assembly is 25 DEG C, AM1.5) under peak power summation, unit kWp；
The method of determination is：The photovoltaic module for being adopted is multiplied by total tablet number per piece peak power under standard test condition；G is for the moment
The solar irradiance received by point photovoltaic module sensitive surface, changes with weather condition, and unit is kW/m2；C1 power
Irradiance coefficient, i.e. solar photovoltaic assembly peak power with the change of solar irradiance and percentage change, according to too
Sun can photovoltaic module performance different and different, unit be-2；Power irradiance degree coefficient can be given birth to by solar photovoltaic assembly
Business men is provided, and also can be determined by test；The temperature of the internal photovoltaic cell of a certain time point solar photovoltaic assembly of T, by ring
Border temperature and self generating and the impact generated heat and change, unit for DEG C；C2 temperature power coefficient, i.e. photovoltaic group
Part peak power percentage change with the change of photovoltaic battery temperature inside solar photovoltaic assembly, according to solar energy
Volt assembly property is different and different, unit for %/DEG C；Temperature power coefficient can be provided by solar photovoltaic assembly manufacturer,
Can be determined by test；Kd direct current augmenting factor, the contamination containing solar photovoltaic assembly surface, back flow prevention element and transmission of electricity
The correction of line loss, can be determined by test；η INV inverter efficiency, is direct current that photovoltaic module is produced by inverter
Electricity is converted to the efficiency of alternating current, by the offer of inverter life manufacturer；The attenuation quotient of C3 solar photovoltaic assembly, the i.e. sun
After energy photovoltaic module is decayed with the passage of use time, peak power and peak power when dispatching from the factory under standard testing state
Ratio, by solar photovoltaic assembly, manufacturer provides.
2. verification method according to claim 1, it is characterised in that：Determine the test method of power irradiance degree coefficient value
For：One or more pieces samples are extracted from the solar photovoltaic assembly of same type, with the A level for meeting national standard in test chamber
Solar simulator, adjusting the internal photovoltaic battery temperature of solar photovoltaic assembly to 25 DEG C and makes air quality reach AM1.5, makes
Simulated solar light irradiance is from 200W/m2Gradually change to 1200W/m2, and photovoltaic group under test simulation sunlight difference irradiance
The maximum output of part, draws the curve that maximum output changes with the change of simulated solar irradiance, in highest spoke
Illumination and minimum irradiance most middle a little on, take the slope of maximum output, i.e. power irradiance degree coefficient C1.
3. verification method according to claim 1, it is characterised in that：The test method for determining temperature power coefficient value is：
One or more pieces samples are extracted from the solar photovoltaic assembly of same type, in test chamber with the A level for meeting national standard too
Sunlight simulator, it is 1000W/m to adjust simulated solar light irradiance2And make air quality reach AM1.5, make inside photovoltaic module
The temperature of photovoltaic cell is gradually changed to not higher than 10 DEG C from being not less than 40 DEG C, the maximum output that tests under different temperatures,
Draw the curve that maximum output changes with temperature change, maximum temperature and minimum temperature most middle a little on,
Take the slope of maximum output, i.e. temperature power coefficient C2.
4. verification method according to claim 1, it is characterised in that：Determine the test method of direct current augmenting factor value
For：In the case of parallel networking type photovoltaic power station normal work, composition parallel networking type photovoltaic power station several, each is by multi-disc light
In the electric unit of volt component connection, select a certain electric unit and measure the output of its DC distribution outfan；Select again
Certain the piece solar photovoltaic assembly in another electric unit is selected, its surface is cleaned, while aforementioned measurement is carried out, measure the piece
The output of solar photovoltaic assembly, by the former divided by the latter and solar photovoltaic assembly included by an electric unit piece
The product of number, as direct current augmenting factor kd.
5. verification method according to claim 1, it is characterised in that：Solar irradiance G is not by irradiance sensor by low
In the frequency collection data of 5 minutes 1 time, and irradiance sensor is installed in the same inclination of solar photovoltaic assembly sensitive surface
In plane.
6. verification method according to claim 1, it is characterised in that：The internal photovoltaic battery temperature T of photovoltaic module is by temperature
Sensor is by the frequency collection data for being not less than 5 minutes 1 time, and temperature sensor is packaged in solar photovoltaic assembly.
7. verification method according to claim 6, it is characterised in that：Temperature sensor is close to the internal photovoltaic of photovoltaic module
The back of battery.
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| CN108462468A (en) * | 2018-03-06 | 2018-08-28 | 上海振华重工电气有限公司 | A kind of Portable photovoltaic module power analog device |
| CN108985625A (en) * | 2018-07-16 | 2018-12-11 | 浙江电腾云光伏科技有限公司 | A kind of photovoltaic apparatus operating analysis method |
| CN109756185A (en) * | 2017-11-03 | 2019-05-14 | 财团法人资讯工业策进会 | Judge solar array whether abnormal computer installation and method |
| CN112598208A (en) * | 2020-08-11 | 2021-04-02 | 上海质卫环保科技有限公司 | Method for calculating Anti-PID product investment return rate based on inverter operating voltage |
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