BS EN 61724-1:2017 – TC:2020 Edition

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Tracked Changes. Photovoltaic system performance – Monitoring

Published By	Publication Date	Number of Pages
BSI	2020	138

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IEC 61724-1:2017 outlines equipment, methods, and terminology for performance monitoring and analysis of photovoltaic (PV) systems. It addresses sensors, installation, and accuracy for monitoring equipment in addition to measured parameter data acquisition and quality checks, calculated parameters, and performance metrics. In addition, it serves as a basis for other standards which rely upon the data collected.

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PDF Pages	PDF Title
76	undefined
81	CONTENTS
84	FOREWORD
86	INTRODUCTION Figures Figure 1 – Possible elements of PV systems
88	1 Scope 2 Normative references
89	3 Terms and definitions
92	4 Monitoring system classification 5 General 5.1 Measurement uncertainty Tables Table 1 – Monitoring system classifications and suggested applications
93	5.2 Calibration 5.3 Repeated elements 5.4 Power consumption 5.5 Documentation 5.6 Inspection
94	6 Data acquisition timing and reporting 6.1 Sampling, recording, and reporting Figure 2 – Sampling, recording, and reporting
95	6.2 Timestamps 7 Measured parameters 7.1 General requirements Table 2 – Sampling and recording interval requirements
97	Table 3 – Measured parameters and requirements for each monitoring system class
99	7.2 Irradiance 7.2.1 On-site irradiance measurement Table 4 – Relation between system size (AC) and number of sensors for specific sensors referenced in Table 3
100	Table 5 – Sensor choices and requirements for in-plane and global irradiance
101	Table 6 – Irradiance sensor alignment accuracy
102	Table 7 – Irradiance sensor maintenance requirements
104	7.2.2 Satellite remote sensing of irradiance
105	7.3 Environmental factors 7.3.1 PV module temperature Table 8 – PV module temperature sensor maintenance requirements
106	7.3.2 Ambient air temperature 7.3.3 Wind speed and direction Table 9 – Ambient air temperature sensor maintenance requirements
107	7.3.4 Soiling ratio Table 10 – Wind sensor maintenance requirements
109	7.3.5 Rainfall 7.3.6 Snow 7.3.7 Humidity
110	7.4 Tracker system 7.4.1 Single-axis trackers 7.4.2 Dual-axis trackers for >20x systems 7.5 Electrical measurements
111	7.6 External system requirements 8 Data processing and quality check 8.1 Daylight hours Table 11 – Inverter-level electrical measurement requirements Table 12 – Plant-level AC electrical output measurement requirements
112	8.2 Quality check 8.2.1 Removing invalid readings 8.2.2 Treatment of missing data 9 Calculated parameters 9.1 Overview
113	9.2 Summations 9.3 Irradiation Table 13 – Calculated parameters
114	9.4 Electrical energy 9.4.1 General 9.4.2 DC output energy 9.4.3 AC output energy 9.5 Array power rating 9.5.1 DC power rating 9.5.2 AC power rating 9.6 Yields 9.6.1 General
115	9.6.2 PV array energy yield 9.6.3 Final system yield 9.6.4 Reference yield 9.7 Yield losses 9.7.1 General 9.7.2 Array capture loss 9.7.3 Balance of systems (BOS) loss
116	9.8 Efficiencies 9.8.1 Array (DC) efficiency 9.8.2 System (AC) efficiency 9.8.3 BOS efficiency 10 Performance metrics 10.1 Overview
117	10.2 Summations 10.3 Performance ratios 10.3.1 Performance ratio Table 14 – Performance metrics
118	10.3.2 Temperature-corrected performance ratios
119	10.4 Performance indices
120	11 Data filtering 11.1 Use of available data 11.2 Filtering data to specific conditions 11.3 Reduced inverter, grid, or load availability
121	Annex A (informative)Sampling interval A.1 General considerations A.2 Time constants A.3 Aliasing error
122	A.4 Example
123	Annex B (informative)Module backsheet temperature sensor selection and attachment B.1 Objective B.2 Sensor and material selection B.2.1 Optimal sensor types B.2.2 Optimal tapes B.2.3 Cyanoacrylate adhesives and backsheet integrity
124	B.3 Sensor attachment method B.3.1 Permanent versus temporary B.3.2 Attachment location B.3.3 Sensor attachment
125	Figure B.1 – Sensor attachment, permanent Figure B.2 – Sensor attachment, temporary Figure B.3 – Sensor element wire strain relief
127	Annex C (informative)Derate factors
128	Annex D (normative)Systems with local loads, storage, or auxiliary sources D.1 System types Figure D.1 – Energy flow between possible elements of different PV system types
129	Table D.1 – Elements of different PV system types
130	D.2 Parameters and formulas Table D.2 – Parameters and equations for different system types
136	Bibliography

Status

Withdrawn

Pages

138

Publication Date

2020-02-25

Withdrawn Date

2020-09-03

ISBN

978 0 539 09870 9

Standard Number

BS EN 61724-1:2017 – TC

Title

Tracked Changes. Photovoltaic system performance – Monitoring

Descriptors

Data layout, Solar cells, Electrical measurement, Stability, Solar radiation, Electric power systems, Radiation measurement, Sampling methods, Photovoltaic cells, Data processing, Solar power, Photoelectricity, Real-time systems, Photoelectric cells, Solar-powered devices, Information exchange, Performance testing

Publisher

BSI

Committee

GEL/82

ICS Codes

27.160 - Solar energy engineering


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