DEVELOPMENT OF TRANSITIONAL METHODS Determination

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DEVELOPMENT OF TRANSITIONAL METHODSDetermination of the Efficiency of InvertersDunlop E.D., Gracia Amillo A., Salis E., Sample T., Taylor NC2 Energy Efficiency and RenewablesDirectorate Energy, Transport and ClimateThe European Commission’sscience and knowledge serviceJoint Research CentrePV Expert Meeting. Ispra, 31st October 2018

InvertersProposed functional parameter:"1 kWh of AC power output from a reference photovoltaicsystem (excluding the efficiency of the inverter) underpredefined climatic and installation conditions for 1 yearand assuming a service life of 10 years".Model the performance of the inverter DC to AC conversion efficiency Efficiency MPP tracking: static and dynamic2PV Expert Meeting Ispra, 31st October 2018

IEC 61683 Photovoltaic systems –Power conditioners- Procedure for measuringefficiency Second edition under development (Jan 2020) Applicable to stand-alone and utility-interactive PV systems Efficiency calculated from direct measurement of input and outputpower at various levels of rated powerGrid-connectedStand-alone3 PV Expert Meeting Ispra, 31st October 2018The resulting data shallbe presented in tabularform and may also bepresented graphically

IEC 61683 Photovoltaic systems –Power conditioners- Procedure for measuringefficiency Weighted average efficiency: hIWeighting factors, ki, depend on the inverter type4 Grid-connected: regional irradiance duration curve Stand-alone: load duration curvePV Expert Meeting Ispra, 31st October 2018

EN 50530 Overall efficiency of grid connectedinverters Current state: withdrawn Procedure for measuring the efficiency of the static and dynamicMaximum Power Point Tracking (MPPT) Overall efficiency calculated from static MPPT and the conversionefficiency from IEC 61683 with additional measurements.PAC hconv PDC hconv hMPPT PMPPGrid-connected5 PV Expert Meeting Ispra, 31st October 2018

EN 50530 Overall efficiency of grid connectedinvertersWeighted MPPT and conversion efficiencies European EfficiencyhEUR 0.03 h5% 0.06 h10% 0.13 h20% 0.10 h30% 0.48 h50% 0.20 h100% CEC Efficiency (California Energy Commission)hCEC 0.04 h10% 0.05 h20% 0.12 h30% 0.21 h50% 0.53 h75% 0.05 h100%hi static MPPT efficiency at partial MPP power: MPP i (PMPP,PVS/PDC,r)PMPP,PVS Power provided by the power simulatorPDC,r Rated input power of the inverter6PV Expert Meeting Ispra, 31st October 2018

Inverter information. ExampleIEC 616837PV Expert Meeting Ispra, 31st October 2018

Inverter datasheet. Examples8PV Expert Meeting Ispra, 31st October 2018

Inverter datasheet. Examples9PV Expert Meeting Ispra, 31st October 2018

Conclusions There exist experimental methodologies to define the inverter'sefficiency described in standards which are, however, at presentunder revision. Usefulness of having a single weighted average efficiency valueor efficiency curves with several points. Interpolation methodology should be defined in order to applythe efficiency curves values. Possibility to define new weighted factors for the predefinedclimatic conditions mentioned in the functional parameterdescription.10EU PVSEC 2018, 24-28 September, Brussels

IEC 61683. 8 PV Expert Meeting Ispra, 31st October 2018 Inverter datasheet. Examples. 9 PV Expert Meeting Ispra, 31st October 2018 Inverter datasheet. Examples. 10 Conclusions EU PVSEC 2018, 24-28 September, Brussels † There

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