【PVPMC】Hukseflux-Jia-太阳辐照度测量的最新进展与模型合的推荐规程

13th PVPMC Workshop 2019 / Kushan 2 LATEST DEVELOPMENTS IN SOLAR IRRADIANCE MEASUREMENT- BEST PRACTICES- COUPLING WITH MODELS 3 Michael JIA Hukseflux Beijing Presented by TCOMSYS01 Hot Cube 4 Pyranometers Use in monitoring services Weakest link in the chain 7 solar irradiance measurement improving measurement accuracy improving data availability IEC 61724-1 PV system performance monitoring – part 1 “monitoring” ISO TR 9901 field pyranometers recommended practice for useSubjects 8 Monitoring according to IEC 61724 rapidly becomes the standard ISO 9901 is under revision, referring to IEC 61724-1 IEC 61724-1 is under revision to include Monitoring for bifacial systems What is new since May 2018 9 PV system simplified A Input solar irradiance in W/m2 B System PV system in m2 C Output Electrical power in W D System efficiency C/AB Degradation change of D versus time dD/dt performance ratios system name-plate rating performance index more detailed model of system performance. OMSYS01 Hot Cube 10 Test results c mparing to “name plate” temperature corrected OMSYS01 Hot Cube 11 Test results c mparing to model index OMSYS01 Hot Cube 12 Monitoring is an industry Industry is driven by investors banks/ asset managers Utility scale PV plants hire independent monitoring companiesPV monitoring OMSYS01 Hot Cube 13 IEC 61724-1 2017 OMSYS01 Hot Cube 14 POA GHI RHI OMSYS01 Hot Cube 15 PV monitoringaccording to IEC 61724 OMSYS01 Hot Cube 16 IEC pyranometer class OMSYS01 Hot Cube 17 IEC calibration OMSYS01 Hot Cube 18 IEC heating ventilation against dew and frost OMSYS01 Hot Cube 19 recommends the use of the best instruments Recommends heating high accuracy reduces “financial risk profile” stresses maintenance, inspection calibrationSummaryIEC61724-1 OMSYS01 Hot Cube 20 Typical IECClass A station OMSYS01 Hot Cube 21 ASTM G2 3-17 OMSYS01 Hot Cube 22 Uncertainty depends on Moving sun Variable environmental conditions Maintenance Data availability dew, frost, snow Horizon Reflections tilted installation Albedo bifacialsNot easy to atain a high accuracy OMSYS01 Hot Cube 23 Calibration uncertainty Instrument specifications Maintenance Typical uncertainty budget OMSYS01 Hot Cube 24 Analysis according to ASTM OMSYS01 Hot Cube 25 Meanwhile, in he r al world, OMSYS01 Hot Cube 26 powder snow in Utah USA OMSYS01 Hot Cube 27 snow OMSYS01 Hot Cube 28 snow 29 Webcam NOAA USA 30 Webcam NOAA USA