CN103576036A - Comprehensive quality evaluation technology for grid-connected photovoltaic (PV) power generation system - Google Patents
Comprehensive quality evaluation technology for grid-connected photovoltaic (PV) power generation system Download PDFInfo
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Abstract
The invention discloses a comprehensive quality evaluation technology for a grid-connected photovoltaic (PV) power generation system. The evaluation process includes the following steps: the total solar irradiation H incident on a PV array surface of the grid-connected PV power generation system is measured and calculated; the total solar irradiation energy E received by the grid-connected PV power generation system is calculated based on the area A of PV modules applied in the grid-connected PV power generation system, the number N of the applied modules, and the module declared efficiency [mu]STC, and the theoretical gross generation WDC (direct current) of the grid-connected PV power generation system is further obtained; monitoring statistics of the gross generation WAC (alternate current) of the grid-connected side of the grid-connected PV power generation system is carried out; the comprehensive quality evaluation coefficient of the grid-connected PV power generation system is calculated based on a formula, i.e. comprehensive quality evaluation coefficient R=actual gross generation WAC of the grid-connected PV power generation system/theoretical gross generation WDC of the grid-connected PV power generation system*100%. The comprehensive quality evaluation technology for the grid-connected PV power generation system has the advantage of easiness in calculation and operation as well as high practicability, thereby achieving the worthiness for wide popularization.
Description
Technical field
The present invention relates to photovoltaic application technical field, be specifically related to a kind of quality overall evaluation technology of grid-connected photovoltaic power generation system.
Background technology
In recent years, Chinese photovoltaic application market has represented development fast, and domestic photovoltaic installation amount is increased sharply to the 8.5GW in the end of the year 2012 from the 140MW of 2000-2008 accumulative total, and the average speed with annual 2.8 times is increasing.When following the explosive growth of photovoltaic installation amount, it is the change of domestic photovoltaic subsidy policy, in August, 2013, National Development and Reform Committee issues extra urgent file < < National Development and Reform Committee, and about performance lever of price, effect promotes the notice > > that photovoltaic industry develops in a healthy way, and the centralized photovoltaic plant mark post rate for incorporation into the power network in clear and definite national San Lei solar energy resources district is respectively 0.9 yuan of every kilowatt hour, 0.95 yuan, 1 yuan; For distributed photovoltaic power generation project, according to generated energy, carry out electricity price subsidy, subsidy standard is 0.42 yuan of every kilowatt hour.From new announcement policy, show, the photovoltaic subsidy policy direction of country formally turns to rate for incorporation into the power network subsidy mode from subsidy in early stage mode (golden sun engineering), this also means the height of grid-connected photovoltaic power generation system generating capacity, the quality of quality will directly affect the key issues such as photovoltaic system earning rate and cost recovery cycle.
At present the evaluation of domestic grid-connected photovoltaic power generation system is only rested in the installed capacity detection of system, by actual measurement electricity generation system photovoltaic array DC output power and according to certain formula to calculating, go out the nominal power under its standard test condition (STC), and the comparative analysis of the system nominal power of calculating by detection and system installed capacity, thereby realize the evaluation to grid-connected photovoltaic power generation system.This technology ignored from photovoltaic array direct current output to and site between loss, also ignored also incoordinate concept of system installed capacity and generating capacity simultaneously, can not be all sidedly, synthetically the power generation performance of grid-connected photovoltaic power generation system and construction quality are evaluated.We have invented a kind of quality overall evaluation technical scheme of grid-connected photovoltaic power generation system for above deficiency.
Summary of the invention
The deficiency existing in order to overcome above technology, the quality overall evaluation technology of a kind of grid-connected photovoltaic power generation system of the present invention, comprising: photovoltaic array plane, photovoltaic module area, photovoltaic module; It is characterized in that: described grid-connected photovoltaic power generation system quality overall evaluation technology comprises the following steps:
(1) in monitoring period of time T, adopt proven standard cell or solar irradiation meter in grid-connected photovoltaic power generation system photovoltaic array same level, every sampling interval τ measures photovoltaic array dip plane solar irradiance G, calculates the total solar irradiation H that incides grid-connected photovoltaic power generation system photovoltaic array plane in monitoring period of time T;
(2) according to grid-connected photovoltaic power generation system photovoltaic module area A used, component count N used and step (1) gained, incide total solar irradiation H of photovoltaic system photovoltaic array plane, calculate total solar irradiation energy E that grid-connected photovoltaic power generation system receives in monitoring period of time T;
(3) according to the declared efficiency μ of grid-connected photovoltaic power generation system photovoltaic module used
sTCand the many total solar irradiation energy E of photovoltaic system of step (2) calculating, calculate the theoretical gross generation W of grid-connected photovoltaic power generation system in monitoring period of time T
dC;
(4) from electric energy meter meter, read and add up the gross actual power generation W of grid-connected photovoltaic power generation system in monitoring period of time T
aC, calculate grid-connected photovoltaic power generation system quality overall evaluation coefficients R.
Described monitoring period of time T, answers long enough to obtain the service data that can represent load and environmental baseline, take 1-3 as suitable.
Described sampling interval τ, because solar irradiance parameter rate of change is very fast, so sampling interval τ should be 1 minute or less.
Described Σ
t, be illustrated in monitoring period of time T, to each dip plane solar irradiation G summation.
Described photovoltaic module area A, the long L providing according to photovoltaic module specification table and wide W dimensional parameters, calculate assembly area.
The declared efficiency μ of described photovoltaic module
sTC, P wherein
sTCfor photovoltaic module nominal power, G
sTCfor standard testing state solar irradiance, i.e. 1kW/m
2, A is assembly area.
The concrete beneficial effect of the present invention is:
The present invention has defined the ratio of the actual alternative electric generation amount of grid-connected photovoltaic power generation system and theoretical DC generation amount, object is to consider the system energy loss that the devices such as photovoltaic array in photovoltaic system, inverter and AC distribution equipment and factor cause, and embodies the comprehensive electric generating Performance and quality of grid-connected photovoltaic power generation system; Grid-connected photovoltaic power generation system quality overall evaluation coefficient of the present invention is for for calculating gained under this electricity generation system infield and sun resources supplIes corresponding to mounting means, therefore can realize the photovoltaic system of different latitude, mounting means and capacity is analyzed, and computation process is simple, practical; In addition, because grid-connected photovoltaic power generation system cost etc. is all relevant with power system capacity and theoretical generated energy, by the calculating of grid-connected photovoltaic power generation system quality overall evaluation coefficient of the present invention, contributing to has more and understands in depth the cost of energy of system and cost performance.
Accompanying drawing explanation
Below in conjunction with drawings and Examples of the present invention, the present invention is further described in detail.
Fig. 1 is the described assessment technique process flow diagram of one of quality overall evaluation technology embodiment of a kind of grid-connected photovoltaic power generation system of the present invention.
Concrete embodiment
The quality overall evaluation technology of a kind of grid-connected photovoltaic power generation system of the present invention, comprising: photovoltaic array plane, photovoltaic module area, photovoltaic module; Described grid-connected photovoltaic power generation system quality overall evaluation technology comprises the following steps:
(1) in monitoring period of time T, adopt proven standard cell or solar irradiation meter in grid-connected photovoltaic power generation system photovoltaic array same level, every sampling interval τ measures photovoltaic array dip plane solar irradiance G, calculates the total solar irradiation H that incides grid-connected photovoltaic power generation system photovoltaic array plane in monitoring period of time T;
(2) according to grid-connected photovoltaic power generation system photovoltaic module area A used, component count N used and step (1) gained, incide total solar irradiation H of photovoltaic system photovoltaic array plane, calculate total solar irradiation energy E that grid-connected photovoltaic power generation system receives in monitoring period of time T;
(3) according to the declared efficiency μ of grid-connected photovoltaic power generation system photovoltaic module used
sTCand the many total solar irradiation energy E of photovoltaic system of step (2) calculating, calculate the theoretical gross generation W of grid-connected photovoltaic power generation system in monitoring period of time T
dC;
(4) from electric energy meter meter, read and add up the gross actual power generation W of grid-connected photovoltaic power generation system in monitoring period of time T
aC, calculate grid-connected photovoltaic power generation system quality overall evaluation coefficients R.
Described monitoring period of time T, answers long enough to obtain the service data that can represent load and environmental baseline, take 1-3 as suitable.
Described sampling interval τ, because solar irradiance parameter rate of change is very fast, so sampling interval τ should be 1 minute or less.
Described Σ
t, be illustrated in monitoring period of time T, to each dip plane solar irradiation G summation.
Described photovoltaic module area A, the long L providing according to photovoltaic module specification table and wide W dimensional parameters, calculate assembly area.
The declared efficiency μ of described photovoltaic module
sTC, P wherein
sTCfor photovoltaic module nominal power, G
sTCfor standard testing state solar irradiance, i.e. 1kW/m
2, A is assembly area.
Specific embodiments of the present invention is described in detail as embodiment to take a certain grid-connected photovoltaic power generation system in Hainan Province.Embodiment grid-connected photovoltaic power generation system engineering assembly nominal power used is 235W, long 1650mm, and wide 990mm, area is 1.634m
2, 84624 of component count, the photovoltaic module total area 137,974.96m
2, system actual capacity 19.886.64kWp, monitoring period of time T is 1 year.
As shown in Figure 1, according to the assessment technique process flow diagram one of quality overall evaluation technology embodiment of a kind of grid-connected photovoltaic power generation system of the present invention Suo Shu, first calculate and incide photovoltaic array plane total solar irradiation H of a year.According to solar irradiation, count record, solar irradiation monthly accounting, the irradiation numerical value that this month last day, 18:00 read on solar irradiation meter is deducted to month last day 18:00 and read the solar irradiation numerical quantity obtaining, solar irradiation for this month, as shown in table 1 is a certain grid-connected system position, Hainan, in April, 2012-2013 photovoltaic array plane in each month year March solar radiation quantities that adopt solar irradiation instrumentation to obtain.Therefore,, in this monitoring period of time in 1 year, the total solar irradiation H that incides photovoltaic array plane is 1528.33kWh/m
2.
Table 1: a certain grid-connected system in Hainan in April, 2012-2013 photovoltaic array plane in each month year March solar radiation quantity
Because photovoltaic generating system is 1.634m with assembly surface area
2, 84624 of component count, the assembly total area 137 of photovoltaic system, 974.96m
2, so total solar irradiation energy E=1528.33kWh/m of receiving in monitoring period of time 1 year of grid-connected photovoltaic power generation system
2* 137,974.96m
2=2.11 * 10
8kWh.
According to the declared efficiency μ of photovoltaic module
sTCcomputing formula, the declared efficiency μ of assembly for this grid-connected photovoltaic power generation system
sTC=235W/ (1000W/m
2* 1.634m
2) * 100%=14.4%, therefore can calculate the theoretical gross generation W of grid-connected photovoltaic power generation system in monitoring period of time 1 year
dC=2.11 * 10
8kWh * 14.4%=30,384,000kWh.
According to electric energy meter, count record, this grid-connected photovoltaic power generation system actual power generation monthly accounting, the generated energy numerical value that this month last day, 18:00 read on electric energy meter meter is deducted to month last day 18:00 and read the actual power numerical quantity obtaining, actual power generation for this month, in April, 2012-2013 actual power generations in each month year March that adopt electric energy meter metering to obtain for a certain grid-connected system in Hainan as shown in table 2, i.e. the gross actual power generation W of grid-connected photovoltaic power generation system in this monitoring period of time 1 year
aCbe 26,425,986kWh, therefore finally calculate this grid-connected photovoltaic power generation system quality overall evaluation coefficients R=26,425,986kWh/30,384,000kWh * 100%=86.97%.
Table 2: a certain grid-connected system in Hainan in April, 2012-2013 photovoltaic array plane in each month year March solar radiation quantity
From above result of calculation, show, according to the present invention, a kind of grid-connected photovoltaic power generation system quality overall evaluation technology obtains, the quality overall evaluation coefficient of a certain grid-connected photovoltaic power generation system in Hainan Province is 86.97%, the energy loss causing due to each factor in system operational process is approximately 13%, has shown power generation performance and construction quality that this grid-connected system is higher.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (6)
1. a quality overall evaluation technology for grid-connected photovoltaic power generation system, comprising: photovoltaic array plane, photovoltaic module area, photovoltaic module; It is characterized in that: described grid-connected photovoltaic power generation system quality overall evaluation technology comprises the following steps:
(1) in monitoring period of time T, adopt proven standard cell or solar irradiation meter in grid-connected photovoltaic power generation system photovoltaic array same level, every sampling interval τ measures photovoltaic array dip plane solar irradiance G, calculates the total solar irradiation H that incides grid-connected photovoltaic power generation system photovoltaic array plane in monitoring period of time T;
(2) according to grid-connected photovoltaic power generation system photovoltaic module area A used, component count N used and step (1) gained, incide total solar irradiation H of photovoltaic system photovoltaic array plane, calculate total solar irradiation energy E that grid-connected photovoltaic power generation system receives in monitoring period of time T;
(3) according to the declared efficiency μ of grid-connected photovoltaic power generation system photovoltaic module used
sTCand the many total solar irradiation energy E of photovoltaic system of step (2) calculating, calculate the theoretical gross generation W of grid-connected photovoltaic power generation system in monitoring period of time T
dC;
(4) from electric energy meter meter, read and add up the gross actual power generation W of grid-connected photovoltaic power generation system in monitoring period of time T
aC, calculate grid-connected photovoltaic power generation system quality overall evaluation coefficients R.
2. according to the quality overall evaluation technology of claim 1 grid-connected photovoltaic power generation system, it is characterized in that: described monitoring period of time T, answer long enough to obtain the service data that can represent load and environmental baseline, take 1-3 as suitable.
3. according to the quality overall evaluation technology of claim 1 grid-connected photovoltaic power generation system,, it is characterized in that: described sampling interval τ, because solar irradiance parameter rate of change is very fast, so sampling interval τ should be 1 minute or less.
4. according to the quality overall evaluation technology of claim 1 grid-connected photovoltaic power generation system, it is characterized in that: described Σ
t, be illustrated in monitoring period of time T, to each dip plane solar irradiation G summation.
5. according to the quality overall evaluation technology of claim 1 grid-connected photovoltaic power generation system, it is characterized in that: described photovoltaic module area A, the long L providing according to photovoltaic module specification table and wide W dimensional parameters, calculate assembly area.
6. according to the quality overall evaluation technology of claim 1 grid-connected photovoltaic power generation system, it is characterized in that: the declared efficiency μ of described photovoltaic module
sTC, P wherein
sTCfor photovoltaic module nominal power, G
sTCfor standard testing state solar irradiance, i.e. 1kW/m
2, A is assembly area.
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| CN104318013A (en) * | 2014-10-21 | 2015-01-28 | 河海大学常州校区 | Method for computing optimal inclination angles of distributed photovoltaic systems of roofs |
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| CN111310955A (en) * | 2018-12-11 | 2020-06-19 | 北京铂阳顶荣光伏科技有限公司 | Photovoltaic module installation area prediction method and device, storage medium and electronic equipment |
| CN114943405A (en) * | 2022-03-30 | 2022-08-26 | 武汉涛初科技有限公司 | Comprehensive evaluation method of photovoltaic new energy power generation system based on multidimensional analysis |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111310955A (en) * | 2018-12-11 | 2020-06-19 | 北京铂阳顶荣光伏科技有限公司 | Photovoltaic module installation area prediction method and device, storage medium and electronic equipment |
| CN114943405A (en) * | 2022-03-30 | 2022-08-26 | 武汉涛初科技有限公司 | Comprehensive evaluation method of photovoltaic new energy power generation system based on multidimensional analysis |
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