IEC TS 63156:2021 pdf download

IEC TS 63156:2021 pdf download.Photovoltaic systems – Power conversion equipment performance – Energy evaluation method
1 Scope
This document describes the procedure for evaluating the energy conversion performance of stand-alone or grid-connected power conversion equipment (PCE) used in PV systems. This procedure includes the calculation of inverter performance to anticipate the energy yield of PV systems. This evaluation method is based on standard power efficiency calculation procedures for PCE found in IEC 61683 and IEC 62891, but provides additional methods for evaluating the expected overall energy efficiency for a particular location given solar load profiles. This document can be used as the energy evaluation method for PCE in IEC TS 61724-3, which defines a procedure for evaluating a PV system’s actual energy production relative to its modeled or expected performance.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61683, Photovoltaic systems – Power conditioners – Procedure for measuring efficiency IEC TS 61836, Solar photovoltaic energy systems – Terms, definitions and symbols IEC 62891, Maximum power point tracking efficiency of grid connected photovoltaic inverters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61836 as well as the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.3 rate of change of irradiance R change in irradiance amount during 1 s Note 1 to entry: Unit: W•m −2 •s −1. 3.4 rated input voltage V DC,r rated input voltage specified by the manufacturer, to which other data sheet information refers Note 1 to entry: Unit: V. 3.5 rated input power P DC,r rated input power of the power conversion equipment, which can be converted under continuous operating conditions Note 1 to entry: Unit: W. 3.6 rated output voltage V AC,r utility grid voltage to which other data sheet information refers Note 1 to entry: Unit: V. 3.7 rated output power P AC,r active power that the power conversion equipment can output during continuous operation Note 1 to entry: Unit: W. 3.8 PV simulator MPP-Power P MPP,PVS MPP power provided by the PV simulator Note 1 to entry: Unit: W. 3.9 input power P DC measured input power of the device under test Note 1 to entry: Unit: W. 3.10 PV simulator MPP voltage V MPP,PVS MPP voltage provided by the PV simulator Note 1 to entry: Unit: V.
4 Workflow of energy conversion efficiency evaluation method
4.1 General Clause 4 describes the workflow for the energy conversion efficiency evaluation method. This method consists of two parts. Part one (4.2) addresses the conversion efficiency measurements according to the procedures in IEC 61683 and IEC 62891. Part two (4.3) addresses the subsequent energy conversion efficiency calculations provided by this document using test data and solar load profiles. Both steps have the option for evaluating the impact of dynamic energy conversion efficiency. For projects where there are not significant dynamic irradiance fluctuations, standard solar profiles can be used without including the dynamic energy efficiency measurement or calculation.Figure 1 shows the flow of the energy conversion efficiency evaluation for power conversion equipment. First, the static energy conversion efficiency should be measured with the rated input and output voltages based on the description of IEC 61683 (see Annex B). Then, if necessary, the dynamic energy conversion efficiency should be measured for meteorological or other conditions; the necessity should be determined by agreement between users and suppliers. The dynamic energy conversion efficiency method should be based on IEC 62891 (see Annex C).