CN103678872B - A kind of photovoltaic power generation system performance evaluation method and device - Google Patents
A kind of photovoltaic power generation system performance evaluation method and device Download PDFInfo
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Abstract
The present invention provides a kind of photovoltaic power generation system performance evaluation method and device, is applied to technical field of electric power, and the method includes: obtain service data and the meteorological data of photovoltaic generating system；Calculate the functional relation setting in the case of reference temperature between theoretical power output and the solar irradiance of photovoltaic generating system；Obtain the real output of photovoltaic generating system, corresponding relation between photovoltaic module temperature and solar irradiance；In the case of being converted to real output set reference temperature, obtain with reference to real output；Determine with reference to the corresponding relation between real output and solar irradiance；Draw theoretical output power curve；Draw with reference to real output scatter diagram；The performance of assessment photovoltaic generating system.The method and device that the present invention provides is conducive to on-demand formulation maintenance plan, optimizes the O&M level of photovoltaic generating system, reduces the life-cycle maintenance cost of equipment.
Description
Technical field
The present invention relates to technical field of electric power, in particular it relates to a kind of photovoltaic power generation system performance evaluation method and device.
Background technology
Along with computer software and the development of sensing technology, in conventional electric power generation field, occurred in that electrically-based equipment shape in recent years
The maintenance of state and service mode, the decline in health state of equipment can be monitored, assesses and predict by this pattern constantly,
And on-demand formulation maintenance plan, while preventing equipment failure, the maintenance period of extension device to greatest extent, minimizing sets
Standby life-cycle maintenance cost.This pattern it is critical only that the health status to equipment make quickly, the assessment of science.
To use maintenance and the service mode of the electrically-based equipment state of aforementioned conventional power field in field of photovoltaic power generation,
Then need the health status of photovoltaic power generation equipment to be made quickly, the assessment of science, whether analyze the performance of photovoltaic power generation equipment
Reach design standard, if be in sub-health state, if need repair based on condition of component.But it is different from conventional power generation systems, light
Photovoltaic generating system has the scattered feature of performance, and its manufacturer related to is more, number of devices is relatively big, equipment routing inspection and maintenance
Needing to consider many factors such as weather, traffic, therefore, photovoltaic generating system can not indiscriminately imitate conventional electric power generation neck simply
Territory is for the appraisal procedure of equipment health status.
Finding through literature search, the authorization day for announcing is on 09 21st, 2011, the Chinese invention of Publication No. 102195342A
Patent " a kind of real-time monitoring system for photovoltaic power station component status ", mainly describes a kind of photovoltaic monitoring system, this system
The monitoring chip monitoring this solar module it is provided with in the terminal box of each solar module, if a certain
Block assembly breaks down and can quickly find, positions rapidly particular location, such that it is able to overhaul rapidly, improves generated energy, and it is main
The technological means that realizes wanted is the fast monitored being realized fault by chip technology；The authorization day for announcing is on February 17th, 2012,
The Chinese invention patent " performance prediction of a kind of photovoltaic plant and fault alarm method " of Publication No. 102566435A, the party
Method is mainly by empirical model or the polynomial regression model of setting up power station performance prediction, it is achieved power station performance prediction and fault
Early warning, the basis of performance prediction is still that substantial amounts of index, and does not form the unified metric system of Performance Evaluation, i.e. should
Method only proposes a kind of new approaches calculating photovoltaic index；The authorization day for announcing is on 01 04th, 2012, Publication No.
The Chinese invention patent " performance detecting system of photovoltaic generating system " of 103197131A, mainly describes a kind of photovoltaic and sends out
The performance detection hardware system of electricity system, mainly realizes the effectively collection of various types of signal when photovoltaic generating system runs, converts
With transmission etc., eventually through the voltage signal received to detect the performance of photovoltaic generating system；The authorization day for announcing is 2011
December 14, Chinese invention patent " parallel network power generation on-line monitoring and the state estimation system of Publication No. 102279327A
System ", describe a kind of distributed new monitoring platform based on the design of CPU full-embedded type, mainly emphasize the place of hardware
Reason ability, real-time, reliability, extensibility etc..
The most not being specifically designed for photovoltaic generating system health status carries out system and the method for comprehensive assessment, aforementioned
The maintenance based on equipment state and the service mode that have been applied to conventional electric power generation field are not the most sent out in field of photovoltaic power generation
Exhibition, the theory the most not referred to and experience.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of photovoltaic power generation system performance evaluation method and device, to provide one
Plant and maintenance based on equipment state and the service mode in conventional electric power generation field are applied to field of photovoltaic power generation, it is achieved photovoltaic is sent out
The health status of electricity system carries out the technology of comprehensive assessment.
To achieve these goals, the embodiment of the present invention provides a kind of photovoltaic power generation system performance evaluation method, including:
Obtain service data and the meteorological data of photovoltaic generating system；
Service data according to described photovoltaic generating system and meteorological data, calculate described photovoltaic in the case of setting reference temperature and send out
Functional relation between theoretical power output and the solar irradiance of electricity system；
Obtain the real output of described photovoltaic generating system, corresponding pass between photovoltaic module temperature and solar irradiance
System；
Real output according to described photovoltaic generating system and the photovoltaic module temperature of correspondence, by described real output
In the case of being converted to described setting reference temperature, obtain with reference to real output；
Determine described with reference to the corresponding relation between real output and solar irradiance；
According in the case of described setting reference temperature between theoretical power output and the solar irradiance of described photovoltaic generating system
Functional relation, draw theoretical output power curve；
According to described with reference to the corresponding relation between real output and solar irradiance, draw and dissipate with reference to real output
Point diagram；
According to the relation between described theoretical output power curve and described reference real output scatter diagram, assess described light
The performance of photovoltaic generating system.
The present invention also provides for a kind of photovoltaic generating system capability evaluating device, including:
Data acquisition module, for obtaining service data and the meteorological data of photovoltaic generating system；
Theoretical power (horse-power) functional relation module, for the service data according to described photovoltaic generating system and meteorological data, calculating sets
Functional relation between theoretical power output and the solar irradiance of described photovoltaic generating system in the case of determining reference temperature；
Actual power corresponding relation module, for obtaining the real output of described photovoltaic generating system, photovoltaic module temperature
And the corresponding relation between solar irradiance；
With reference to actual power conversion module, for the real output according to described photovoltaic generating system and the photovoltaic group of correspondence
Part temperature, in the case of described real output is converted to described setting reference temperature, obtains with reference to real output；
With reference to actual power corresponding relation module, for determining described right with reference between real output and solar irradiance
Should be related to；
Theoretical output power curve drafting module, for according to described photovoltaic generating system in the case of described setting reference temperature
Functional relation between theoretical power output and solar irradiance, draws theoretical output power curve；
Real output scatter diagram drafting module, for according between described reference real output and solar irradiance
Corresponding relation, draws with reference to real output scatter diagram；
Performance estimation module, for according between described theoretical output power curve and described reference real output scatter diagram
Relation, assess the performance of described photovoltaic generating system.
By means of technique scheme, the present invention first calculate photovoltaic generating system theory power output and solar irradiance it
Between functional relation, and the real output data of photovoltaic generating system are converted setting reference temperature, then draw
Photovoltaic generating system theory output power curve and reference real output scatter diagram, finally by the ginseng under the same terms
Examine real output scatter diagram to be analyzed with theoretical output power curve, it is achieved that the health to photovoltaic generating system
State is carried out quickly and the assessment of science.The present invention is by the maintenance of equipment state electrically-based in conventional electric power generation field and safeguards mould
Formula introduces field of photovoltaic power generation, the most on-demand formulation maintenance plan, optimizes the O&M level of photovoltaic generating system, reduces
The life-cycle maintenance cost of equipment.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, institute in embodiment being described below
The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is the schematic flow sheet of the photovoltaic power generation system performance evaluation method that the present invention provides；
Fig. 2 be the theoretical output power curve that provides of the present invention with reference to real output scatter diagram；
Fig. 3 is the structural representation of the photovoltaic generating system capability evaluating device that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
The present invention provides a kind of photovoltaic power generation system performance evaluation method, as it is shown in figure 1, the method includes:
Step S11, obtains service data and the meteorological data of photovoltaic generating system；
Step S12, according to service data and the meteorological data of described photovoltaic generating system, calculates in the case of setting reference temperature
Functional relation between theoretical power output and the solar irradiance of described photovoltaic generating system；
Step S13, obtains the real output of described photovoltaic generating system, between photovoltaic module temperature and solar irradiance
Corresponding relation；
Step S14, according to real output and the photovoltaic module temperature of correspondence of described photovoltaic generating system, by described reality
In the case of border power output is converted to described setting reference temperature, obtain with reference to real output；
Step S15, determines described with reference to the corresponding relation between real output and solar irradiance；
Step S16, according to the theoretical power output of described photovoltaic generating system in the case of described setting reference temperature and sun spoke
Functional relation between illumination, draws theoretical output power curve；
Step S17, according to described with reference to the corresponding relation between real output and solar irradiance, draws with reference to actual
Power output scatter diagram；
Step S18, according to the relation between described theoretical output power curve and described reference real output scatter diagram,
Assess the performance of described photovoltaic generating system.
The present invention is by the functional relation between photovoltaic generating system theory power output and solar irradiance, and actual output work
Corresponding relation between rate and solar irradiance is all converted under same temperature (setting reference temperature) such that it is able to realize section
Learn, assess exactly the purpose of photovoltaic generating system health status.
Setting reference temperature in the present invention can be configured according to actual needs, and this is not especially limited by the present invention.?
In a kind of preferred embodiment, the STC(Standard Test that European commission sets can be selected for photovoltaic module
Condition, standard test condition) in test temperature 25 DEG C.
Step S16 is drawn theoretical output power curve and is drawn with reference to real output scatter diagram institute with step S17 by the present invention
The drawing practice used is not especially limited, such as, can use third party's drawing instruments such as Excel, Matlab, it is also possible to root
Above-mentioned drawing process is realized according to being actually needed designed, designed professional drawing software.
First said method calculates the functional relation between photovoltaic generating system theory power output and solar irradiance, and
The real output data of photovoltaic generating system are converted setting reference temperature, then draws photovoltaic generating system theory defeated
Go out power curve and with reference to real output scatter diagram, finally by the reference real output scatterplot under the same terms
Scheme to be analyzed with theoretical output power curve, it is achieved that the health status of photovoltaic generating system is carried out quickly and science
Assessment.Maintenance and the service mode of equipment state electrically-based in conventional electric power generation field are introduced photovoltaic generation neck by the method
Territory, the most on-demand formulation maintenance plan, optimize the O&M level of photovoltaic generating system, the life-cycle reducing equipment safeguards into
This.
In a kind of preferred embodiment, the photovoltaic power generation system performance evaluation method that the present invention provides, in step S11 and step
Between rapid S12, further comprise the steps of: and screen out condition according to setting, the service data to the photovoltaic generating system that step S11 obtains
Screen with meteorological data.
The purpose of this step is that reject can not be correct in the service data of photovoltaic generating system and meteorological data that step S11 obtains
Reflection photovoltaic generating system theory output situation data, such as, reject photovoltaic generating system abnormal operational conditions (as
Limit power control status, malfunction etc.) under service data and meteorological data, retain photovoltaic generating system properly functioning
Service data under state and meteorological data.Setting screening conditions in this step can be configured according to actual needs, this
The protection domain of invention contains service data and the meteorology of the photovoltaic generating system using any means to reach step S11 obtains
Data are screened, to reject the purpose of the data that wherein can not correctly reflect photovoltaic generating system theory output situation.
In a kind of preferred embodiment, the above-mentioned screening conditions set as: retain the photovoltaic generating system that step S11 obtains
Service data and meteorological data in, the average output power of solar irradiance and photovoltaic generating system is in setting normal range (NR)
Interior and photovoltaic module is in the data under peak power output, screens out remainder data.
In a kind of preferred embodiment, the service data of the photovoltaic generating system that step S11 obtains includes: photovoltaic generation system
Running status, inverter output power and inverter number of units, inverter efficiency curve, header box efficiency and the header box platform of system
Number, power distribution cabinet efficiency and power distribution cabinet number of units, the photovoltaic module decline factor and number of photovoltaic modules, the mounted angle of photovoltaic module；
The meteorological data that step S11 obtains specifically includes that total solar radiation degree, solar water planar radiation degree or sun inclined plane
Radiancy, weather station temperature.
In a kind of preferred embodiment, step S12 is according to the service data of described photovoltaic generating system and meteorological data, meter
Calculate the functional relation setting in the case of reference temperature between theoretical power output and the solar irradiance of described photovoltaic generating system,
Employing equation below:
Wherein, S is real-time solar irradiance in inclined plane；
HBFor solar irradiance direct on horizontal plane, can be obtained by corresponding sensor；
H is total solar irradiance on horizontal plane, can be obtained by corresponding sensor；
HdFor nephelometric turbidity unit on horizontal plane, can be obtained by corresponding sensor；
β is policy inclination angle, for fixed value；
ρ is ground surface reflectance；
φ is local latitude, for fixed value；
N is to start the number of days to the year end from the same day, and n is natural number, and 1≤n≤365；
δ is solar declination；
ωsFor sunset hour angle on horizontal plane；
ωSTFor sunset hour angle in inclined plane；
HdTFor sky radiation component；
HRTFor ground return radial component；
RBRatio for radial component direct on the direct radial component in inclined plane and horizontal plane；
PsTheoretical power output for photovoltaic generating system；
PhTheoretical power output for every road header box；
ξsyFor the attenuation rate of photovoltaic module, photovoltaic module producer can be given；
ηsyFor photovoltaic generating system device efficiency, photovoltaic module producer can be given；
PstTheoretical power output for every road photovoltaic group string；
LhThe number of the photovoltaic group string for comprising in the header box of every road:
PpTheoretical power output for every piece of photovoltaic module；
LstThe number of the photovoltaic module for comprising in the photovoltaic group string of every road；
V'mFor actual measurement MPPT maximum power point tracking voltage；
VmFor setting the MPPT maximum power point tracking voltage under reference conditions, photovoltaic module producer can be given；
C is photovoltaic module voltage temperature coefficient, and photovoltaic module producer can be given；
Δ T is and sets photovoltaic module temperature difference under reference conditions；
E is natural logrithm；
B is photovoltaic module radiancy coefficient, and photovoltaic module producer can be given；
Δ S is and the irradiance error set under reference conditions；
I'mFor actual measurement MPPT maximum power point tracking electric current；
ImFor setting MPPT maximum power point tracking electric current under reference conditions, photovoltaic module producer can be given；
SREFFor setting irradiation level under reference conditions；
A is photovoltaic module current temperature coefficient, and photovoltaic module producer can be given；
TREFFor setting temperature under reference conditions, consistent with the setting reference temperature in step S12；
T is Real-Time Optical photovoltaic assembly temperature；
TairFor environment temperature, can obtain from meteorological data；
NOCT is the operating temperature ratings of photovoltaic module, with reference to the set-point of photovoltaic apparatus producer；
EtotFor the total irradiation intensity of solar energy, can be obtained by corresponding sensor.
It should be noted that the T in above-mentioned formulaREFFor setting the temperature under reference conditions, with the setting reference in step S12
Temperature is consistent.
The setting reference conditions used in above-mentioned formula are not especially limited by the present invention, can set according to actual needs
Put.In a kind of preferred embodiment, the reference conditions that set in above-mentioned formula set as European commission for photovoltaic module
STC, its condition is: solar module surface temperature 25 DEG C, spatial distribution AM1.5, irradiation level 1000W/m2；That is,
TREF=25℃。
It should be noted that outside divided by upper computing formula, protection scope of the present invention contains employing additive method and is calculated and sets
Determine the functional relation between theoretical power output and the solar irradiance of photovoltaic generating system in the case of reference temperature.
In a kind of preferred embodiment, the step S14 real output according to described photovoltaic generating system and the light of correspondence
Photovoltaic assembly temperature, in the case of described real output is converted to described setting reference temperature, obtains with reference to actual output work
Rate, employing equation below:
Wherein, Pr_tFor with reference to real output；
PrReal output for photovoltaic generating system；
A is photovoltaic module current temperature coefficient, and photovoltaic module producer can be given；
C is photovoltaic module voltage temperature coefficient, and photovoltaic module producer can be given；
Δ T is and sets photovoltaic module temperature difference under reference conditions.
The setting reference conditions used in above-mentioned formula are not especially limited by the present invention, can set according to actual needs
Put.In a kind of preferred embodiment, the reference conditions that set in above-mentioned formula set as European commission for photovoltaic module
STC, its condition is: solar module surface temperature 25 DEG C, spatial distribution AM1.5, irradiation level 1000W/m2。
It should be noted that outside divided by upper computing formula, protection scope of the present invention contains employing additive method and reality is exported
Power conversion, in the case of described setting reference temperature, obtains with reference to real output.
In a kind of preferred embodiment, step S18 is according to described theoretical output power curve and the actual output work of described reference
Relation between rate scatter diagram, assesses the performance of described photovoltaic generating system, particularly as follows:
When determining, described reference real output scatter diagram comes across described theoretical output power curve periphery setting range
When the quantity of interior point accounts for the percentage of whole some sum more than setting reference percentage, it is judged that the property of described photovoltaic generating system
Can be for being in normal condition.
According to the practical operating experiences of photovoltaic generating system, when photovoltaic generating system is in optimal operational condition, in fact
Border power output and theoretical power output closest to, and when photovoltaic generating system is in abnormal condition (such as malfunction)
Time, its real output differs relatively big, when under same setting reference temperature, by difference sun spoke with theoretical power output
When reference real output scatter diagram that illumination is corresponding and theoretical output power curve are compared, its performance is exactly: work as light
When photovoltaic generating system is in optimal operational condition, occur in above theoretical output power curve with reference to real output scatterplot or
Distance close near person, when photovoltaic generating system is in abnormal condition, will go out with reference to real output scatterplot
At the most theoretical output power curve either above or below larger distance.
For different photovoltaic generating systems, in this step, setting range and setting can be carried out according to practical experience with reference to percentage
Arrange.Such as it show same such as Fig. 2 (abscissa is solar irradiance, and ordinate is photovoltaic power generation system output power)
Set reference temperature (T=TREFUnder), the distribution of reference real output scatterplot and theory that different solar irradiances are corresponding are defeated
Go out power curve, according to the scatterplot distribution situation of reference real output in this figure, i.e. can determine that current photovoltaic generating system
Performance state, if the quantity of the point come across in scatterplot in theoretical output power curve periphery setting range accounts for all puts sum
Percentage more than set with reference to percentage time, then can determine that photovoltaic generating system is in normal condition；Otherwise, so that it may judge
Photovoltaic generating system is in abnormal condition.Owing to the abnormal condition of photovoltaic generating system has multiple situation, therefore for tool
The judgement of body reason also needs to carry out according to practical experience, such as, occurs in below theoretical power curve if scatterplot is concentrated and does not exists
In setting range, then can determine that systematic function is in inferior health or severe conditions；If scatterplot is concentrated and is occurred in theoretical power curve
Top and not in setting range, then system is likely to be at severe conditions or malfunction (such as weather station fault).
The present invention also provides for a kind of photovoltaic generating system capability evaluating device, as it is shown on figure 3, this device includes:
Data acquisition module 31, for obtaining service data and the meteorological data of photovoltaic generating system；
Theoretical power (horse-power) functional relation module 32, for the service data according to described photovoltaic generating system and meteorological data, calculates
Set the functional relation between theoretical power output and the solar irradiance of described photovoltaic generating system in the case of reference temperature；
Actual power corresponding relation module 33, for obtaining the real output of described photovoltaic generating system, photovoltaic module temperature
Corresponding relation between degree and solar irradiance；
With reference to actual power conversion module 34, for the real output according to described photovoltaic generating system and the photovoltaic of correspondence
Assembly temperature, in the case of described real output is converted to described setting reference temperature, obtains with reference to real output；
With reference to actual power corresponding relation module 35, described with reference between real output and solar irradiance for determining
Corresponding relation；
Theoretical output power curve drafting module 36, for according to described photovoltaic generating system in the case of described setting reference temperature
Theoretical power output and solar irradiance between functional relation, draw theoretical output power curve；
Real output scatter diagram drafting module 37, for according between described reference real output and solar irradiance
Corresponding relation, draw with reference to real output scatter diagram；
Performance estimation module 38, for according to described theoretical output power curve with described with reference to real output scatter diagram it
Between relation, assess the performance of described photovoltaic generating system.
In a kind of preferred embodiment, above-mentioned photovoltaic generating system capability evaluating device, also include:
Screening module, for described theoretical power (horse-power) functional relation module 32 according to the service data of described photovoltaic generating system and
Meteorological data, in the case of calculating setting reference temperature between theoretical power output and the solar irradiance of described photovoltaic generating system
Functional relation before, screen out condition according to setting, the operation of photovoltaic generating system that described data acquisition module 31 is obtained
Data and meteorological data are screened.
In a kind of preferred embodiment, above-mentioned screening module of stating is specifically for retaining the service data of described photovoltaic generating system
With in meteorological data, the average output power of solar irradiance and photovoltaic generating system is in setting normal range (NR) and photovoltaic group
Part is in the data under peak power output, screens out remainder data.
In a kind of preferred embodiment, the service data of described photovoltaic generating system includes: the operation shape of photovoltaic generating system
State, inverter output power and inverter number of units, inverter efficiency curve, header box efficiency and header box number of units, power distribution cabinet
Efficiency and power distribution cabinet number of units, the photovoltaic module decline factor and number of photovoltaic modules, the mounted angle of photovoltaic module；
Described meteorological data specifically includes that total solar radiation degree, solar water planar radiation degree or sun inclined plane radiancy, gas
As station temperature.
In a kind of preferred embodiment, theoretical power (horse-power) functional relation module 32 is according to the service data of described photovoltaic generating system
And meteorological data, calculate set in the case of reference temperature the theoretical power output of described photovoltaic generating system and solar irradiance it
Between functional relation time, use equation below:
Wherein, S is real-time solar irradiance in inclined plane；
HBFor solar irradiance direct on horizontal plane；
H is total solar irradiance on horizontal plane；
HdFor nephelometric turbidity unit on horizontal plane；
β is policy inclination angle；
ρ is ground surface reflectance；
φ is local latitude；
N is to start the number of days to the year end, 1≤n≤365 from the same day；
δ is solar declination；
ωsFor sunset hour angle on horizontal plane；
ωSTFor sunset hour angle in inclined plane；
HdTFor sky radiation component；
HRTFor ground return radial component；
RBRatio for radial component direct on the direct radial component in inclined plane and horizontal plane；
PsTheoretical power output for photovoltaic generating system；
PhTheoretical power output for every road header box；
ξsyAttenuation rate for photovoltaic module；
ηsyFor photovoltaic generating system device efficiency；
PstTheoretical power output for every road photovoltaic group string；
LhThe number of the photovoltaic group string for comprising in the header box of every road:
PpTheoretical power output for every piece of photovoltaic module；
LstThe number of the photovoltaic module for comprising in the photovoltaic group string of every road；
V'mFor actual measurement MPPT maximum power point tracking voltage；
VmFor setting the MPPT maximum power point tracking voltage under reference conditions；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions；
E is natural logrithm；
B is photovoltaic module radiancy coefficient；
Δ S is and the irradiance error set under reference conditions；
I'mFor actual measurement MPPT maximum power point tracking electric current；
ImFor setting MPPT maximum power point tracking electric current under reference conditions；
SREFFor setting irradiation level under reference conditions；
A is photovoltaic module current temperature coefficient；
TREFFor setting temperature under reference conditions；
T is Real-Time Optical photovoltaic assembly temperature；
TairFor environment temperature；
NOCT is the operating temperature ratings of photovoltaic module；
EtotFor the total irradiation intensity of solar energy；
T is photovoltaic module temperature.
In a kind of preferred embodiment, reference actual power conversion module 34 is according to the actual output of described photovoltaic generating system
The photovoltaic module temperature of power and correspondence, in the case of described real output is converted to described setting reference temperature, obtains
During with reference to real output, employing equation below:
Wherein, Pr_tFor with reference to real output；
PrReal output for photovoltaic generating system；
A is photovoltaic module current temperature coefficient；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions.
In a kind of preferred embodiment, performance estimation module 38 specifically for: described dissipate with reference to real output when determining
The quantity coming across the point in described theoretical output power curve periphery setting range in point diagram accounts for the percentage of all some sums
More than when setting with reference to percent value, it is judged that the performance of described photovoltaic generating system is for being in normal condition.
Photovoltaic generating system capability evaluating device and the photovoltaic power generation system performance evaluation method that the present invention provides based on as
Realizing principle, detailed description of the invention can be found in the aforementioned introduction to photovoltaic power generation system performance evaluation method, and here is omitted.
Above-mentioned photovoltaic generating system capability evaluating device achieves the health status to photovoltaic generating system to be carried out quickly and science
Assessment, maintenance and the service mode of equipment state electrically-based in conventional electric power generation field are introduced field of photovoltaic power generation, have
It is beneficial to on-demand formulation maintenance plan, optimizes the O&M level of photovoltaic generating system, preventing the colleague of equipment failure, maximum limit
The maintenance period of degree ground extension device, reduces the life-cycle maintenance cost of equipment.
Particular embodiments described above, has been carried out the most specifically the purpose of the present invention, technical scheme and beneficial effect
Bright, be it should be understood that the specific embodiment that the foregoing is only the present invention, the protection being not intended to limit the present invention
Scope, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in
Within protection scope of the present invention.
Claims (14)
1. a photovoltaic power generation system performance evaluation method, it is characterised in that including:
Obtain service data and the meteorological data of photovoltaic generating system；
Service data according to described photovoltaic generating system and meteorological data, calculate described photovoltaic in the case of setting reference temperature and send out
Functional relation between theoretical power output and the solar irradiance of electricity system；
Obtain the real output of described photovoltaic generating system, corresponding pass between photovoltaic module temperature and solar irradiance
System；
Real output according to described photovoltaic generating system and the photovoltaic module temperature of correspondence, by described real output
In the case of being converted to described setting reference temperature, obtain with reference to real output；
Determine described with reference to the corresponding relation between real output and solar irradiance；
According in the case of described setting reference temperature between theoretical power output and the solar irradiance of described photovoltaic generating system
Functional relation, draw theoretical output power curve；
According to described with reference to the corresponding relation between real output and solar irradiance, draw and dissipate with reference to real output
Point diagram；
According to the relation between described theoretical output power curve and described reference real output scatter diagram, assess described light
The performance of photovoltaic generating system.
Photovoltaic power generation system performance evaluation method the most according to claim 1, it is characterised in that send out according to described photovoltaic
The service data of electricity system and meteorological data, the theoretical output work of described photovoltaic generating system in the case of calculating setting reference temperature
Before functional relation between rate and solar irradiance, also include:
Screening out condition according to setting, service data and meteorological data to described photovoltaic generating system are screened.
Photovoltaic power generation system performance evaluation method the most according to claim 2, it is characterised in that screen out bar according to setting
Part, service data and meteorological data to described photovoltaic generating system screen, particularly as follows:
Retain in service data and the meteorological data of described photovoltaic generating system, solar irradiance and photovoltaic generating system average
Power output is in setting normal range (NR) and photovoltaic module is in the data under peak power output, screens out remainder data.
Photovoltaic power generation system performance evaluation method the most according to claim 1, it is characterised in that
The service data of described photovoltaic generating system includes: the running status of photovoltaic generating system, inverter output power and inverse
Become device number of units, inverter efficiency curve, header box efficiency and header box number of units, power distribution cabinet efficiency and power distribution cabinet number of units, photovoltaic
The assembly decline factor and number of photovoltaic modules, the mounted angle of photovoltaic module；
Described meteorological data includes: total solar radiation degree, solar water planar radiation degree or sun inclined plane radiancy, weather station
Temperature.
Photovoltaic power generation system performance evaluation method the most according to claim 4, it is characterised in that send out according to described photovoltaic
The service data of electricity system and meteorological data, the theoretical output work of described photovoltaic generating system in the case of calculating setting reference temperature
Functional relation between rate and solar irradiance, employing equation below:
Wherein, S is real-time solar irradiance in inclined plane；
HBFor solar irradiance direct on horizontal plane；
H is total solar irradiance on horizontal plane；
HdFor nephelometric turbidity unit on horizontal plane；
β is policy inclination angle；
ρ is ground surface reflectance；
φ is local latitude；
N is to start the number of days to the year end, 1≤n≤365 from the same day；
δ is solar declination；
ωsFor sunset hour angle on horizontal plane；
ωSTFor sunset hour angle in inclined plane；
HdTFor sky radiation component；
HRTFor ground return radial component；
RBRatio for radial component direct on the direct radial component in inclined plane and horizontal plane；
PsTheoretical power output for photovoltaic generating system；
PhTheoretical power output for every road header box；
ξsyAttenuation rate for photovoltaic module；
ηsyFor photovoltaic generating system device efficiency；
PstTheoretical power output for every road photovoltaic group string；
LhThe number of the photovoltaic group string for comprising in the header box of every road:
PpTheoretical power output for every piece of photovoltaic module；
LstThe number of the photovoltaic module for comprising in the photovoltaic group string of every road；
Vm′mFor actual measurement MPPT maximum power point tracking voltage；
VmFor setting the MPPT maximum power point tracking voltage under reference conditions；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions；
E is natural logrithm；
B is photovoltaic module radiancy coefficient；
Δ S is and the irradiance error set under reference conditions；
I′mFor actual measurement MPPT maximum power point tracking electric current；
ImFor setting MPPT maximum power point tracking electric current under reference conditions；
SREFFor setting irradiation level under reference conditions；
A is photovoltaic module current temperature coefficient；
TREFFor setting temperature under reference conditions；
T is photovoltaic module temperature；
TairFor environment temperature；
NOCT is the operating temperature ratings of photovoltaic module；
EtotFor the total irradiation intensity of solar energy.
Photovoltaic power generation system performance evaluation method the most according to claim 1, it is characterised in that send out according to described photovoltaic
The real output of electricity system and the photovoltaic module temperature of correspondence, be converted to described setting reference by described real output
Under temperature conditions, obtain reference real output, employing equation below:
Wherein, Pr_tFor with reference to real output；
PrReal output for photovoltaic generating system；
A is photovoltaic module current temperature coefficient；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions.
Photovoltaic power generation system performance evaluation method the most according to claim 1, it is characterised in that defeated according to described theory
Go out the relation between power curve and described reference real output scatter diagram, assess the performance of described photovoltaic generating system,
Particularly as follows:
When determining, described reference real output scatter diagram comes across described theoretical output power curve periphery setting range
When the quantity of interior point accounts for the percentage of whole some sum more than setting reference percentage, it is judged that the property of described photovoltaic generating system
Can be for being in normal condition.
8. a photovoltaic generating system capability evaluating device, it is characterised in that including:
Data acquisition module, for obtaining service data and the meteorological data of photovoltaic generating system；
Theoretical power (horse-power) functional relation module, for the service data according to described photovoltaic generating system and meteorological data, calculating sets
Functional relation between theoretical power output and the solar irradiance of described photovoltaic generating system in the case of determining reference temperature；
Actual power corresponding relation module, for obtaining the real output of described photovoltaic generating system, photovoltaic module temperature
And the corresponding relation between solar irradiance；
With reference to actual power conversion module, for the real output according to described photovoltaic generating system and the photovoltaic group of correspondence
Part temperature, in the case of described real output is converted to described setting reference temperature, obtains with reference to real output；
With reference to actual power corresponding relation module, for determining described right with reference between real output and solar irradiance
Should be related to；
Theoretical output power curve drafting module, for according to described photovoltaic generating system in the case of described setting reference temperature
Functional relation between theoretical power output and solar irradiance, draws theoretical output power curve；
Real output scatter diagram drafting module, for according between described reference real output and solar irradiance
Corresponding relation, draws with reference to real output scatter diagram；
Performance estimation module, for according between described theoretical output power curve and described reference real output scatter diagram
Relation, assess the performance of described photovoltaic generating system.
Photovoltaic generating system capability evaluating device the most according to claim 8, it is characterised in that also include:
Screening module, for gentle according to the service data of described photovoltaic generating system in described theoretical power (horse-power) functional relation module
Image data, in the case of calculating setting reference temperature between theoretical power output and the solar irradiance of described photovoltaic generating system
Before functional relation, screen out condition according to setting, the service data to the photovoltaic generating system that described data acquisition module obtains
Screen with meteorological data.
Photovoltaic generating system capability evaluating device the most according to claim 9, it is characterised in that described screening module
Specifically for retaining in the service data of described photovoltaic generating system and meteorological data, solar irradiance and photovoltaic generating system
Average output power is in setting normal range (NR) and photovoltaic module is in the data under peak power output, screens out its remainder
According to.
11. photovoltaic generating system capability evaluating device according to claim 8, it is characterised in that
The service data of described photovoltaic generating system includes: the running status of photovoltaic generating system, inverter output power and inverse
Become device number of units, inverter efficiency curve, header box efficiency and header box number of units, power distribution cabinet efficiency and power distribution cabinet number of units, photovoltaic
The assembly decline factor and number of photovoltaic modules, the mounted angle of photovoltaic module；
Described meteorological data includes: total solar radiation degree, solar water planar radiation degree or sun inclined plane radiancy, weather station
Temperature.
12. photovoltaic generating system capability evaluating device according to claim 11, it is characterised in that described theoretical power (horse-power)
Functional relation module, according to the service data of described photovoltaic generating system and meteorological data, calculates and sets institute in the case of reference temperature
When stating the functional relation between theoretical power output and the solar irradiance of photovoltaic generating system, employing equation below:
Wherein, S is real-time solar irradiance in inclined plane；
HBFor solar irradiance direct on horizontal plane；
H is total solar irradiance on horizontal plane；
HdFor nephelometric turbidity unit on horizontal plane；
β is policy inclination angle；
ρ is ground surface reflectance；
φ is local latitude；
N is to start the number of days to the year end, 1≤n≤365 from the same day；
δ is solar declination；
ωsFor sunset hour angle on horizontal plane；
ωSTFor sunset hour angle in inclined plane；
HdTFor sky radiation component；
HRTFor ground return radial component；
RBRatio for radial component direct on the direct radial component in inclined plane and horizontal plane；
PsTheoretical power output for photovoltaic generating system；
PhTheoretical power output for every road header box；
ξsyAttenuation rate for photovoltaic module；
ηsyFor photovoltaic generating system device efficiency；
PstTheoretical power output for every road photovoltaic group string；
LhThe number of the photovoltaic group string for comprising in the header box of every road:
PpTheoretical power output for every piece of photovoltaic module；
LstThe number of the photovoltaic module for comprising in the photovoltaic group string of every road；
V′mFor actual measurement MPPT maximum power point tracking voltage；
VmFor setting the MPPT maximum power point tracking voltage under reference conditions；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions；
E is natural logrithm；
B is photovoltaic module radiancy coefficient；
Δ S is and the irradiance error set under reference conditions；
I′mFor actual measurement MPPT maximum power point tracking electric current；
ImFor setting MPPT maximum power point tracking electric current under reference conditions；
SREFFor setting irradiation level under reference conditions；
A is photovoltaic module current temperature coefficient；
TREFFor setting temperature under reference conditions；
TairFor environment temperature；
NOCT is the operating temperature ratings of photovoltaic module；
EtotFor the total irradiation intensity of solar energy；
T is photovoltaic module temperature.
13. photovoltaic generating system capability evaluating device according to claim 8, it is characterised in that described with reference to actual
The power conversion module real output according to described photovoltaic generating system and the photovoltaic module temperature of correspondence, by described reality
In the case of power output is converted to described setting reference temperature, when obtaining with reference to real output, employing equation below:
Wherein, Pr_tFor with reference to real output；
PrReal output for photovoltaic generating system；
A is photovoltaic module current temperature coefficient；
C is photovoltaic module voltage temperature coefficient；
Δ T is and sets photovoltaic module temperature difference under reference conditions.
14. photovoltaic generating system capability evaluating device according to claim 8, it is characterised in that described Performance Evaluation
Module specifically for: described with reference to real output scatter diagram comes across described theoretical output power curve periphery when determining
The quantity of the point in setting range accounts for the percentage of all some sums more than when setting with reference to percent value, it is judged that described photovoltaic is sent out
The performance of electricity system is for being in normal condition.
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