Schneider_PVPMC_Webinar_2020-08-05_Solargis

Self-shading analysis in PV simulation: comparison of diferent software packages PVPMC Webinar series I, 5 August 2020 Peter Orosi, ArturSkoczek, BranislavSchnierer Solargis, Slovakia PVPMC Webinar series I, 5 August 2020 2 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 3 About Solargis Solar resource, meteorological and photovoltaic simulation data, software and expert services for power industry •Prospection •Project development •Monitoring •Forecasting 1000+ Customers 100+ countries 5000+ projects per year 20 years of experience in solar industry PVPMC Webinar series I, 5 August 2020 4 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 5 PV simulation model development Current status of Solargis 1 model: •In operation over 12 years •Some parts are outdated •Not easy to serve new or special requirements New challenges: •Improved input data •Improved modeling capabilities •Improved models –higher quality of simulation •Colaboration in project development •Improved PV knowledge –customers are asking more •More detailed simulation in reasonable time PVPMC Webinar series I, 5 August 2020 6 PV simulation model development ÞSG2 simulator is being developed Requirements: •Processing of 1-, 10-, 15-, or 30-minute data (ful time series, customized data) •Representing available period of data (26+ years) •Using updated parameters (TEMP, WS, PWAT, AP), aded more input parameters (ALBEDO, PREC, DUST, SNOW) •High resolution digital elevation model •Single diode model (PVLIB) •SANDIA inverter model •Simulate diferent hierarchical levels of PV power plant •Suporting actual technical standards (ISO, IEC, …) •Provide advanced graphical output •Validation by independent software packages PVPMC Webinar series I, 5 August 2020 7 PV simulation model development Global tilted iradiation (GTI) Mismatch and cable losses Inter-row shading losses Dirt, dust and soiling, snow Shading by terain Losses in the conversion of iradiance into DC in modules Losses in transformers and AC Technical availability Angular reflectivity Losses in the inverters Spectral corection Simplified PV simulation chain Source: http:/ww.tonko.eu/ele/content/6-transform%C3%A1tory PVPMC Webinar series I, 5 August 2020 8 PV simulation model development Global tilted iradiation (GTI) Mismatch and cable losses Inter-row shading losses Dirt, dust and soiling, snow Shading by terain Losses in the conversion of iradiance into DC in modules Losses in transformers and AC Technical availability Angular reflectivity Losses in the inverters Spectral corection Simplified PV simulation chain Source: http:/ww.tonko.eu/ele/content/6-transform%C3%A1tory “GTI efective” “Shaded DC PVOUT” PVPMC Webinar series I, 5 August 2020 9 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 10 Visualization tol •Detailed shading analysis of fix-and tracker-mounted systems •Simulation for specific date •Direct and difuse shading •Electric simulation of hierarchical levels of power plant down to cels •Various strings layouts •Modules orientation (vertical/horizontal) PVPMC Webinar series I, 5 August 2020 11 Visualization tol Results available in: •Large number of parameters •Interactive graphs •Visual presentation Solar, meteo and electric outputs of PV simulation PVPMC Webinar series I, 5 August 2020 12 Visualization tol •Results available also in 3D view •Difuse part of shading •Real shade vs. electrical efect •Cel contribution to generated PVOUT •Curent, voltage, temperature, … al available operational parameters PVPMC Webinar series I, 5 August 2020 13 Visualization tol String 1 Partialy shaded String 2 unshaded •Example for strings Export time series for al day Snapshot for each 15-min interval of the day PVPMC Webinar series I, 5 August 2020 14 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 15 GTI and PVOUT Shading simulation Raytracing method by Solargis •Custom implementation •Monte Carlo backward path-tracing (from cel to the source of light) •Multiple bounces until the source of light is reached •Fuly converged unbiased per cel solution for Lambertiansurfaces (no specular yet) •Universal 3D scene (arbitrary panel placement) •Sky model is adapted from Perez model (uses Solargis data): •Direct normal iradiance •Difuse iradiance (sky isotropic) •Easily extendable to more detailed models of sky (assuming the more detailed sky data is available) PVPMC Webinar series I, 5 August 2020 16 GTI and PVOUT Shading simulation •Single diode model •De Soto model (Single diode model paramscalculated as function of cel temperature and iradiance) •Algorithms inspired by Pvlib, but with custom implementation •PV module parameters are from SAM (System Advisor Model) database •Each cel is simulated •Bypass diodes •Blocking diodes (On/Of) •Conections into substrings, strings, inverters –arbitrary layout PVPMC Webinar series I, 5 August 2020 17 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 18 •Main idea –to verify al possible simulator sections with independent software packages •Raytracing shading simulation –bifacial_radiance •Series of Python functions for RADIANCE (ray tracing lighting simulation tol) for photovoltaic (bifacial) simulations •Preparing for analysis •Electrical efects of shading –LTspiceXVII •Analog electronic circuit simulator/schematic capture/waveform viewer, based on SPICE (Simulation Program with Integrated Circuit Emphasis, Berkeley University of California) open source simulator •Started Verification of shading simulation PVPMC Webinar series I, 5 August 2020 19 •Level of cells in a PV module Verification of shading simulation Suneel Raju Pendem, Suresh Mikkili: Modeling, simulation and performance analysis of solar PV aray configurations (Series, Series–Parallel and Honey-Comb) to extract maximum power under Partial Shading Conditions (htps:/ww.sciencedirect.com/science/article/pi/S2352484717302378) •KYOCERA-KC200GTPV module •Diferences depending on shading situation •In average 0.5%, maximum up to 1.0% •Determined mainly by diferent Single-diode parameters (temp. coef, Rs, Rsh) of used PV module (authors vs. SAM database) PVPMC Webinar series I, 5 August 2020 20 •Level of a single module at STC conditions Verification of shading simulation •Hyundai HiS-M250MG PV module •60 cels simulation, 3 bypass diodes •GTI = 1000 W/m 2 , TEMP = 25°C Simulation tol P MPP [W] SG2 250.27 LTSPICE 250.2828 PVlib 250.2826 PVsyst7.0.5 250.3 SAM 2020.2.29250.29 PVPMC Webinar series I, 5 August 2020 21 •Level of a single string (shaded back row) –landscape orientation Verification of shading simulation •Siberia site (Lat: 59.878, Lon: 119.931), N-S tracker (GCR 50%), no backtracking •10 modules in string (10 x 60 cels), landscapeoriented, one string per row •No DC losses considered •Selected day –12 May 2017, 16:37 local time •60 GTI values fed into LTSPICE simulator and IV and Power curves calculated GTI Difuse PVOUT PVPMC Webinar series I, 5 August 2020 22 Verification of shading simulation Cursor 1 Cursor 2 LTSPICE simulation SG2 -Power SG2 -IV PVPMC Webinar series I, 5 August 2020 23 •On a single string (shaded back row) –portrait orientation Verification of shading simulation •Finland site (Lat: 59.865, Lon: 23.172), N-S tracker (GCR 50%) •10 modules in string (10 x 60 cels), portrait oriented, one string per row •No DC losses considered •Selected day –26 July 2020, 8:52 local time •60 GTI values fed into LTSPICE simulator and IV and Power curves calculated GTI Difuse PVOUT PVPMC Webinar series I, 5 August 2020 24 Verification of shading simulation Cursor 1 Cursor 2 LTSPICE simulation SG2 -Power SG2 -IV PVPMC Webinar series I, 5 August 2020 25 Agenda •About Solargis •PV simulation model development •Visualization tol •GTI and PVOUT shading simulation •Verification of shading simulation •Comparison to other software packages •Conclusions and future work PVPMC Webinar series I, 5 August 2020 26 Comparison to other software packages •9 representative sites •Sites should represent various climate conditions •SAM and Pvsyst •Year 2017, hourly data, exported in required format 0 50 100 150 200 250 300 350 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec GH I [ k W h / m 2 ] Tvarminne Al Dabbyia Daying Pulau Douala Kikorongo Vanrhyndsorp Afrera Tokko PVPMC Webinar series I, 5 August 2020 27 Comparison to other software packages •Fixed tilt 1MWp instalations •Optimum tilt angle •CSI modules, landscape •Centralized inverter •Where possible, other losses set to 0 •20 PV modules in a string •4 strings on a table •Variants with/without inter- row shading (no shading, GCR = 0.4, GCR = 0.5) PVPMC Webinar series I, 5 August 2020 28 Comparison to other software packages •Solargis exports GHI, DNI, DIF •GTI is calculated inside of simulation SW with various models •Albedo (!) •Diferent aproaches lead to diferent input data for simulation even after first step –preparation of data Global Tilted Irradiation (POA) Shadingconditions Yearly diference [%] Not aply -0.6 to +0.3 PVPMC Webinar series I, 5 August 2020 29 Comparison to other software packages •GTI after shadings, soiling, incidence aray losses •Several IAM aproaches exists, SG is using Martin & Ruiz model, which is not implemented in Pvsyst/SAM •Shading calculation methods, solar geometry, hourly data to rough GTI effective Shadingconditions Yearly diference [%] Noshading -0.2 to +1.4 Rel. spacing 2.5 (GCR = 0.4) -8.1 to +1.5 Rel. spacing 2.0 (GCR = 0.5) -10.5 to +1.6 PVPMC Webinar series I, 5 August 2020 30 Comparison to other software packages •DC output after conversion, with electrical efect of shading •Several aproaches exists, GTI and TEMP are main inputs (more aproaches also for TEMP) •User knowledge, skils and practice Shaded DC PVOUT Shadingconditions Yearly diference [%] Noshading +0.4 to +4.6 Rel. spacing 2.5 (GCR = 0.4) -2.1 to +4.6 Rel. spacing 2.0 (GCR = 0.5) -1.6 to +4.6