ASTM E2939-2013(2018) Standard Practice for Determining Reporting Conditions and Expected Capacity for Photovoltaic Non-Concentrator Systems《确定光伏非集中器系统报告条件和预期容量的标准实施规程》.pdf
《ASTM E2939-2013(2018) Standard Practice for Determining Reporting Conditions and Expected Capacity for Photovoltaic Non-Concentrator Systems《确定光伏非集中器系统报告条件和预期容量的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM E2939-2013(2018) Standard Practice for Determining Reporting Conditions and Expected Capacity for Photovoltaic Non-Concentrator Systems《确定光伏非集中器系统报告条件和预期容量的标准实施规程》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E2939 13 (Reapproved 2018)Standard Practice forDetermining Reporting Conditions and Expected Capacityfor Photovoltaic Non-Concentrator Systems1This standard is issued under the fixed designation E2939; the number immediately following the designation indicates the year oforiginal adopti
2、on or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice provides procedures for determining theexpected capacity of
3、a specific photovoltaic system in aspecific geographical location that is in operation under naturalsunlight during a specified period of time. The expectedcapacity is intended for comparison with the measured capacitydetermined by Test Method E2848.1.2 This practice is intended for use with Test Me
4、thodE2848 as a procedure to select appropriate reporting conditions(RC), including solar irradiance in the plane of the modules,ambient temperature, and wind speed, needed for the photo-voltaic system capacity measurement.1.3 The values stated in SI units are to be regarded asstandard. No other unit
5、s of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applic
6、ability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by th
7、e World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy ConversionE2848 Test Method for Reporting Photovoltaic Non-Concentrator System Performance2.2 IEEE Standards:3IEEE 1547-2003 Standard for Interconnecting
8、DistributedResources with Electric Power Systems3. Terminology3.1 Definitions of terms used in this practice may be foundin Terminology E772, IEEE 1547-2003, and Test MethodE2848.3.2 Definitions:3.2.1 expected capacity, photovoltaic system, nthe pre-dicted power rating that is derived from meteorolo
9、gical dataand a performance model that describes a specific PV system ina specific location and time period.3.2.2 measured capacity, photovolaic system, nthe outputpower of a photovoltaic system measured according to TestMethod E2848.3.2.3 performance model, photovoltaic system, na com-puter model w
10、hich, at a minimum, simulates the operation of aparticular photovoltaic system using plane-of-array irradiance,ambient temperature and wind speed data as inputs to calculatethe instantaneous, simulated power output.3.2.4 performance simulation period, photovoltaic system,nthe period of time over whi
11、ch a single expected capacityprediction is performed. Compare with data collection periodin Test Method E2848.3.2.5 plane-of-array irradiance, POA, nsee solarirradiance, hemispherical in Terminology E772.3.2.6 simulated power output, photovoltaic system,nphotovoltaic system power output derived from
12、 meteoro-logical data and a performance model.3.2.7 time resolution, meteorological data, nthe timeinterval between individual meteorological data points that hasa maximum averaging interval of 1 h, used to calculate both thereporting conditions and the expected capacity.4. Summary of Practice4.1 Te
13、st Method E2848 provides a procedure to measure thecapacity of a photovoltaic system. The procedure involves a1This practice is under the jurisdiction of ASTM Committee E44 on Solar,Geothermal and Other Alternative Energy Sources and is the direct responsibility ofSubcommittee E44.09 on Photovoltaic
14、 Electric Power Conversion.Current edition approved May 1, 2018. Published September 2013. Originallyapproved in 2013. Last previous edition approved in 2013 as E2939-13. DOI:10.1520/E2939-13R182For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
15、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),445 Hoes Ln., Piscataway, NJ 08854, http:/www.ieee.org.Copyright ASTM International, 100
16、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Re
17、commendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1multiple linear regression of output power as a function ofplane-of-array irradiance, ambient air temperature, and windspeed data collected during the data collection period, which isa relatively short
18、time period, typically between 3 and 30 days.Using the regression results, the expected capacity (in watts) isthen calculated by substitution of a set of reporting conditionsconsisting of plane-of-array irradiance, ambient airtemperature, and wind speed appropriate for the system undertest into the
19、regression equation.4.2 Although Test Method E2848 states that its procedure issuitable for acceptance testing of newly installed photovoltaicsystems (i.e. acceptance testing), it provides only generalguidance for the selection of the reporting conditions and noguidance for predicting expected capac
20、ity prior to test. Boththe reporting conditions and the expected capacity are neces-sary for acceptance testing.4.3 This practice provides guidance for selecting the report-ing conditions needed for Test Method E2848. This practicealso provides a procedure for determining the expected capac-ity of a
21、 photovoltaic system.4.4 The procedure for determining expected capacity con-sists of the following steps:4.4.1 Procure meteorological data that will be representa-tive4of the POA irradiance, ambient air temperature, and windspeed conditions during the data collection period.4.4.1.1 This is best acc
22、omplished by using meteorologicaldata that is of the same time of year and same weatherconditions seen or expected to be seen during E2848.4.4.2 Procure or develop a performance model representa-tive of the photovoltaic system,4.4.3 Substitute the meteorological data into the perfor-mance model to c
23、alculate the instantaneous, simulated poweroutput of the photovoltaic system, and4.4.4 Use the data set to calculate the expected capacityaccording to Section 9 of Test Method E2848.4.5 The expected capacity can then be compared with thecapacity measured during an acceptance test of a photovoltaicsy
24、stem, if both capacities are determined from the samereporting conditions.5. Significance and Use5.1 This practice can be used to determine an expectedcapacity for an existing or a proposed photovoltaic system in aparticular location during a specified period of time (see datacollection period in Te
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