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SA/SNZ TS 61724.2:2020

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Current

The latest, up-to-date edition.

Photovoltaic system performance Capacity evaluation method (IEC TS 61724-2:2016, MOD)
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Language(s)

English

Published date

04-03-2020

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The objective of this Technical Specification is to define a procedure for measuring and analysing the power production of a specific photovoltaic system with the goal of evaluating the quality of the PV system performance. The test is intended to be applied during a relatively short time period (a few relatively sunny days). The intent of this document is to specify a framework procedure for comparing the measured power produced against the expected power from a PV system on relatively sunny days.

This part of IEC 61724 defines a procedure for measuring and analyzing the power production of a specific photovoltaic system with the goal of evaluating the quality of the PV system performance. The test is intended to be applied during a relatively short time period (a few relatively sunny days).
In this procedure, actual photovoltaic system power produced is measured and compared to the power expected for the observed weather based on the design parameters of the system.
The expected power under reference and measured conditions are typically derived from the design parameters that were used to derive the performance target for the plant as agreed to prior to the commencement of the test. For cases when a power model was not developed during the plant design, a simple model that increases transparency is presented in the annexes as a possible approach.
The intent of this document is to specify a framework procedure for comparing the measured power produced against the expected power from a PV system on relatively sunny days. This test procedure is intended for application to grid-connected photovoltaic systems that include at least one inverter and the associated hardware.
The performance of the system is quantified both during times when the inverters are maximum-power-point tracking and during times when the system power is limited by the output capability of the inverter or interconnection limit, reducing the system output relative to what it would have been with an inverter with generation freely following irradiance, if this condition is relevant.
This procedure can be applied to any PV system, including concentrator photovoltaic systems, using the irradiance (direct or global) that is relevant to the performance of the system.
This test procedure was designed and drafted with a primary goal of facilitating the documentation of a performance target, but it can also be used to verify a model, track performance (e.g., degradation) of a system over the course of multiple years, or to document system quality for any other purpose. The terminology has not been generalized to apply to all of these situations, but the intent is to create a methodology that can be used whenever the goal is to verify system performance at a specific reference condition chosen to be a frequently observed condition. A more complete evaluation of plant performance can be accomplished by using the complementary Technical Specification IEC TS 61724-3, Photovoltaic system performance – Part 3: Energy evaluation method.

Committee
EL-042
DocumentType
Technical Specification
ISBN
978 1 76072 796 3
Pages
22
ProductNote
Modifies IEC TS 61724-2:2016.
PublisherName
Standards Australia
Status
Current

First published as SA/SNZ TS 61724.2:2020.

AS/NZS 61724.1:2020 Photovoltaic system performance Monitoring (IEC 61724-1:2017, MOD)
IEC 60904-5:2011 Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method
IEC 62446-1:2016 Photovoltaic (PV) systems - Requirements for testing, documentation and maintenance - Part 1: Grid connected systems - Documentation, commissioning tests and inspection
IEC 61829:2015 Photovoltaic (PV) array - On-site measurement of current-voltage characteristics
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results Part 4: Basic methods for the determination of the trueness of a standard measurement method
ISO 5725-2:2019 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
IEC TS 61724-3:2016 Photovoltaic system performance - Part 3: Energy evaluation method
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results — Part 5: Alternative methods for the determination of the precision of a standard measurement method
ASTM E 2848 : 2013 Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance
IEC TS 61836 REDLINE : 3ED 2016 SOLAR PHOTOVOLTAIC ENERGY SYSTEMS - TERMS, DEFINITIONS AND SYMBOLS
ISO/IEC Guide 98-1:2009 Uncertainty of measurement — Part 1: Introduction to the expression of uncertainty in measurement

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