Performance optimization of Solar PVplant Through Micro InverterAshish VermaM.Tech (Energy System)500022066University of P...
Power scenario in IndiaGrowing scenario of Renewable energyUPES► Renewable energy accounts forapproximately 12.04% of a to...
 India is largest EPC sector in renewable energyin the World Installed capacity of 27.29 GW(up to feb2013) various miss...
Different type of Solar PV plant and his component UPESGrid Connected System & Component1. Module2. Inverter3. Transformer...
 Grid connected Solar PV plant cost is 8Cr/MWp Land according to technology used(Crystalline & Thin film) Highest cost ...
 CUFwhich is ratio of actual energy produced from the plant to maximum possible outputduring the year Radiation of the S...
Reflection lossdata show that the module faced toward the equator with tilt angle of latitude ,yearlyreflection losses is ...
 Temperature and climate conditionPower decrease according to temperature coefficientTypical value for Crystalline module...
 Ensure continuous and reliable operation Generating maximum energy Maximize the economic performance Ensure better PR...
 It build into or attached to each PV module Each micro inverter convert Dc from each module to AC ,ready for grid conne...
 Activation Process Array Gun Center feed – separate the individual branch circuit current for protection withOCPD(over...
Micro inverter operate similarly to central inverter SystemConnected on each individually moduleHandle much less power tha...
Connection of Micro inverter Integrated with Solar PV Module UPESSource :Enphase Energy
 Deliver design flexibility Integrated intelligence24/7 monitoring analysisQuick and simple design ,installation and man...
 Isolating Communication devicesReduce the communication noiseBetter individual Monitoring ReliableSystem availability g...
PV module with String & Central InverterPV module with Micro InverterMicro Inverter V/S String ,Central Inverter UPES
 Buyers wants to know what would be the PBP of investment Saving and PBP is vary according to location Dependent on var...
LCOE takes account of1. Capital Cost- module cost , cost of power conversion electronics, Installation2. Power harvesting ...
Capital Cost :System Rating -7kWpModule cost per Watt-$2 ($14,000)String Inverter Cost per Watt - $0.5($3,500) Micro Inver...
 PV Evaluation Lab (PVEL), in association with NREL ,recently performed a series offield test to measure the shade impact...
Characteristics Curve of System with Shade effectSource: NREL , PVEL, Enphase energy
Adopted MethodologyPerformance tested on two identical 8kWp ArrayOne connected with String inverter and another is with Mi...
 Mesh with transparency of 36% Shade configuration time is around 20 Minutes Performance is measured with the RGM (Reve...
Result Summary with GraphInverter output V/S Shade area
Question & AnswersThank You….
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performance optimization of Solar pv plant through Micro inverter

  1. 1. Performance optimization of Solar PVplant Through Micro InverterAshish VermaM.Tech (Energy System)500022066University of Petroleum and energy studies
  2. 2. Power scenario in IndiaGrowing scenario of Renewable energyUPES► Renewable energy accounts forapproximately 12.04% of a total214.86 GW of power generationcapacity installed in India.► Demand for power in India hasbeen increasing due to the risingpopulation, growing economy, andchanging lifestyles.► Despite substantial capacityadditions, the power sector is stillin shortage of energy.► Peak demand shortage averagesaround 9%.► Renewable energy installedcapacity was grown at a healthyCAGR of 19% over FY07-FY12Source: MNRE, CEA & Economic survey of India201258%9%1%2%18%12%CoalGasDieselNuclearHydroRES10.2 12.3 14.4 16.82024.5FY07 FY08 FY09 FY10 FY11 FY12Growth of Renewable energyinstalled capacity in IndiaCAGR19%
  3. 3.  India is largest EPC sector in renewable energyin the World Installed capacity of 27.29 GW(up to feb2013) various mission and state policies forenhancing the power generation capacitythrough renewable energy(NSM,NBMMP ,Gujrat Solarpolicy2009 etc.) Target of Renewable energy mix of 15 %upto2017 Total installed capacity of Solar PV was 10 MWbefore 2009 and now its reached up to 1440MW(feb2013) Expected CAGR of installed capacity of SolarPV is 47 % during the 2011-16Source :EFYtimes, MNRE,PV- Magazine, NAPCCBreak Up of Renewable EnergyGrowth rate of Solar PV UPES68.27%13.01%4.63%8.43%0.35% 5.30%Grid Interactive Installedcapacity (In MW)WindSmall HydropowerBiomass PowerBagasseCogenerationWaste to powerSolar PV
  4. 4. Different type of Solar PV plant and his component UPESGrid Connected System & Component1. Module2. Inverter3. Transformer4. Distribution panelOff grid System & Component1. Module2. PCU ( Charger controller /Inverter )3. Battery4. Distribution PanelDecentralized SystemSuitable for where grid connectivity is poor or grid is not viableBest option for Rural Electrification
  5. 5.  Grid connected Solar PV plant cost is 8Cr/MWp Land according to technology used(Crystalline & Thin film) Highest cost sharing by PV module isaround 43%Source: CERCBreak up Cost of Solar PV plant UPES43%7%2%12%13%13%10%% Sharing of Cost/MWModulePCULand CostCivil and GeneralWorkMounting StructureEvacuation cost up toInter connectionpointIDC & Contingencycost
  6. 6.  CUFwhich is ratio of actual energy produced from the plant to maximum possible outputduring the year Radiation of the Site -Responsible of energy generation through solar PVPrimary requirement for design of power plantData me be instant(Irradiance) or integrated(irradiation )Comparable result found the inaccuracy of 20-25% Losses in PV systemWhich cause the power actually delivered to the grid to be lower than the powerproduced from PV moduleCable lossPower InverterDust on the Module surfaceAmbient temperatureVarying insolation levelPerformance parameter of Solar PV plantUPES
  7. 7. Reflection lossdata show that the module faced toward the equator with tilt angle of latitude ,yearlyreflection losses is 1 % relative to STCSoiling LossOccur due to dust and dirt particlesLosses are generally 1%Reduce the power capabilityMismatch EffectLosses due to series and parallel connection of ModuleModule don’t have identical propertyMPPT LossExtract the max power from Solar PVInverter EfficiencyStand alone ,Grid tiedEfficiency measure how well it convert the dc voltage into AC voltageEfficiency of 95-98 %Less efficiency at low power
  8. 8.  Temperature and climate conditionPower decrease according to temperature coefficientTypical value for Crystalline module is -0.4- 0.45%/ CTypical value for thin film module is -0.24-0.25%/ C Design parameter of PlantMinimization of ohmic lossesSelection of efficient transformer and InverterMounting position –proper air ventilation requiredInclination angle –max radiation can be obtained by optimum tilt angle which isdetermine by the latitude of location Module power degradation due to ageing-0.50% reduction of power Per year90% of the max power up to 10 years and 80% of the max power next 15 years
  9. 9.  Ensure continuous and reliable operation Generating maximum energy Maximize the economic performance Ensure better PR Life expectancy Long term commercial utilization of plantNeed of optimization and evaluation of the Performance ? UPES
  10. 10.  It build into or attached to each PV module Each micro inverter convert Dc from each module to AC ,ready for grid connectiondirectly Allow Each module to be an independent ,standalone , Solar AC grid connectedsystem with optimized energy production output Less space for installation No handling to high DC voltage No Issue of single point failure Life is more 20-30 % than String inverter Market Growth is around $14.8Billion*Source: Bloomberg Energy ,NREL, EnphaseMicro Inverter -Technology
  11. 11.  Activation Process Array Gun Center feed – separate the individual branch circuit current for protection withOCPD(over current protection device ) Communication domain Engage cable – connecting the Micro Inverter LCF – when more than one communication domain is installed ,for reducing thenoise level Micro Inverter- Inverter automatic detect the utility scale voltage and export powerthe utility services , connected with CB Micro inverter Sub panel PLC Transformer –use to connect the commercial PV project to utility gridMicro Inverter Component
  12. 12. Micro inverter operate similarly to central inverter SystemConnected on each individually moduleHandle much less power than central inverterYes ,Micro inverter are better option for optimizationImprove the energy harvestIncrease reliabilitySimplify design ,installationBetter monitoring of IndividualsDynamic MPPT efficiency is around 99.3%Integrated with PLCMicro InverterIs micro inverter best option to optimize the performance ? UPES
  13. 13. Connection of Micro inverter Integrated with Solar PV Module UPESSource :Enphase Energy
  14. 14.  Deliver design flexibility Integrated intelligence24/7 monitoring analysisQuick and simple design ,installation and management Increase energy harvestDue to minimization of system losses due to DC-AC conversion Cost effectiveCost is 10-12% high comparable to Central or String InverterEnergy production 18-20% high , so cost effectiveness is justified Limitless scalabilityInclude main panel board of PV load center that feeds multiple micro inverter subpanel distributed across the systemBenefits of Micro Inverter over other Inverter
  15. 15.  Isolating Communication devicesReduce the communication noiseBetter individual Monitoring ReliableSystem availability greater than 99.8%No single point failure of systemSafeLow voltage DCReduce fire riskSource: Enphase energy, NREL
  16. 16. PV module with String & Central InverterPV module with Micro InverterMicro Inverter V/S String ,Central Inverter UPES
  17. 17.  Buyers wants to know what would be the PBP of investment Saving and PBP is vary according to location Dependent on various factor likecost of electricity from the gridFeed in TariffSubsidyCapital costUnpredictable factor , like radiation that affect the amount generation of electricityLCOE (Levelelized cost of Electricity) – best option to comparing thelifetime system cost with total power harvested over the period of time help todetermine the ROIEconomics behind installing Micro Inverter UPES
  18. 18. LCOE takes account of1. Capital Cost- module cost , cost of power conversion electronics, Installation2. Power harvesting –the total power harvested from the system ,through its lifetime and monetary value of each harvested kWh ,determine the financial return3. Operation & Maintenance – Directly proportional to the system reliability ,ifit is difficult to locate the source of problem ,the time spent on locating the fault willincrease the costLow LCOE show that RE power production is cheep and close to achieving GRID parityPower optimizer are also used for extracting the max power from Module ,but cost isincrease $200 per module and need of central inverter same
  19. 19. Capital Cost :System Rating -7kWpModule cost per Watt-$2 ($14,000)String Inverter Cost per Watt - $0.5($3,500) Micro Inverter Cost per Watt- $0.75($5,250)Total =$17,500 Total=$19,250Cost is 10% more than String inverterInstallation CostNo high voltage DC switch and wireNo need to allocate area for inverter in buildingAccording to market survey installation cost for String inverter is $16,500 and for Microinverter is $12,500 for 7kWp plantOffer saving of 24% in installation costEnecsys Case Study : Architecture Cost Evaluation
  20. 20.  PV Evaluation Lab (PVEL), in association with NREL ,recently performed a series offield test to measure the shade impact on solar array output. Solar Micro inverter shows the higher output than a string inverter in certain cases Perform in Light ,Medium and Highly shade – 4%,8%,12% increased energy harvestedby Micro Inverter Solar power electronics ,Inverter ,Micro Inverter ,Power converter have a range ofobtaining Max power curve NREL developed different type of standard test procedure for simulating PVperformance under shadeSource: NREL , PVEL, Enphase energyShade impact On Power Generation Through Solar PVExperimental Case study - String & Micro inverter
  21. 21. Characteristics Curve of System with Shade effectSource: NREL , PVEL, Enphase energy
  22. 22. Adopted MethodologyPerformance tested on two identical 8kWp ArrayOne connected with String inverter and another is with Micro InverterTested under different 78 shaded test conditionSemi Transparent mess in Module
  23. 23.  Mesh with transparency of 36% Shade configuration time is around 20 Minutes Performance is measured with the RGM (Revenue grade meter )Result Micro Inverter perform better in shading String inverter stuck in the a local MPP causing current limited operation of thesystem NREL’s result show that the approximately 50% of the energy lost due to shading bystring inverter ,specially in light shade condition Micro inverter increase the harvested energy 4%,8% and 12% in light , medium andhigh shade condition
  24. 24. Result Summary with GraphInverter output V/S Shade area
  25. 25. Question & AnswersThank You….

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