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NB/T 10394-2020: (Specification for efficiency of photovoltaic power generation system)
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(Specification for efficiency of photovoltaic power generation system)
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NB/T 10394-2020
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Basic data | Standard ID | NB/T 10394-2020 (NB/T10394-2020) | | Description (Translated English) | (Specification for efficiency of photovoltaic power generation system) | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | F12 | | Word Count Estimation | 19,186 | | Date of Issue | 2020-10-23 | | Date of Implementation | 2020-10-23 | | Regulation (derived from) | National Energy Administration Announcement No. 5 of 2020 | | Issuing agency(ies) | National Energy Administration | NB/T 10394-2020: (Specification for efficiency of photovoltaic power generation system)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification for photovoltaic power generation system performance
Energy Industry Standards of the People's Republic of China
Specification for efficiency of photovoltaic power generation system
2020-10-23 released
2020-10-23 implementation
Issued by the National Energy Administration
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Performance parameters...3
4.1 Module efficiency...3
4.2 Bifacial ratio of bifacial modules...3
4.3 Inverter efficiency...3
4.4 Capacity ratio...4
4.5 DC power loss...5
4.6 AC power loss...5
4.7 Selection of solar resource data for photovoltaic power generation system...5
4.8 Calculation of annual on-grid power by photovoltaic power generation system...5
4.9 Actual grid power of photovoltaic power generation system...5
4.10 Electricity Consumption Rate of Comprehensive Station...5
4.11 Total area of photovoltaic power generation system...5
4.12 Installation capacity per unit area...6
4.13 On-grid electricity per unit area...6
4.14 Revenue per unit area of power generation...6
4.15 Economic benefits per unit area...6
4.16 External benefits...6
5 Performance indicators and evaluation methods...6
5.1 Effectiveness evaluation content...6
5.2 Effectiveness evaluation method...6
5.2.1 Annual equivalent utilization hours of the system...6
5.2.2 System energy efficiency ratio...7
5.2.3 Leveling the cost per kilowatt hour...8
5.2.4 Efficiency per unit area...8
5.2.5 kWh external benefits...9
5.3 Effectiveness evaluation process...10
5.3.1 Overview...10
5.3.2 List of Fund Collection...10
5.3.3 Effectiveness evaluation...10
Appendix A (Normative Appendix) Optimization calculation process of photovoltaic power generation system capacity ratio...11
Appendix B (informative appendix) Optimal calculation case of photovoltaic power generation system capacity ratio in typical areas...12
B.1 Selection of typical regions...12
B.2 Typical Case Calculation Boundary Conditions...12
B.3 Typical Case Measurement Process...13
B.4 Reference for the results of representative location calculation examples...14
Foreword
This specification is drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
This specification is managed by the National Energy Administration, put forward by the General Institute of Hydropower and Water Conservancy Planning and Design, and is responsible for daily management.
The General Institute of Planning and Design is responsible for the explanation of specific technical content. If you have any comments or suggestions during the implementation process, please send to the General Institute of Hydropower and Water Conservancy Planning and Design (Address.
No. 2 Kangbei Street, Liupu District, Xicheng District, Beijing, Zip Code. 100120).
Drafting organizations of this specification. General Institute of Hydropower and Water Conservancy Planning and Design, Northwest Survey, Design and Research Institute Co., Ltd. of Power Construction Corporation of China, Shanghai Electric Power
Power Design Institute Co., Ltd., China Photovoltaic Industry Association, China Three Gorges New Energy Company, China Huaneng Group Co., Ltd., Longji Green Energy
Technology Co., Ltd., Tongwei Co., Ltd., Sungrow Power Supply Co., Ltd., Huawei Technologies Co., Ltd., Sunneng Electric Co., Ltd.
Co., Ltd.
The main drafters of this specification. Qin Xiao, Lu Song, Chen Gang, Zhang Bo, Wang Jixue, Xiao Bin, Wang Haoyi, Jin Yanmei,
Fu Zhengning, Zhou Zhi, Hui Xing, Du Wei, Wang Shuo, Cui Yun, Liu Jianping, Ni Xin,
Cui Yongfeng, Liu Xiaoxin, Li Cheng, Tian Lisha, Dong Feifei, Zhao Wei, Li Dongxia, Ren Jiachen,
Liu Yinglian, Lu Guocheng, Niu Zhiyuan, Liu Songmin, Zhang Ling, Zhao Wei, Shu Zhenhuan, Wang Li.
Introduction
The efficiency of photovoltaic power generation system is an index system used for comprehensive evaluation of the technical and economic performance of photovoltaic power generation system.
An important reference indicator in the process of system investment analysis, design optimization, quality management, and operation and maintenance is the acceptance and post-evaluation of photovoltaic power generation systems
Important basis.
In order to standardize and guide the system efficiency evaluation of photovoltaic power generation projects, standardize the efficiency evaluation parameter indexes, calculation methods, and
The efficiency evaluation process, the establishment of a system efficiency evaluation system, and the
This standard is formulated according to the requirements of "Notice on Standardization (Revision) of Supplementary Plan (Second Batch)" (Guoneng Zongtong Technology [2018] No. 191).
Specification for efficiency of photovoltaic power generation system
1 Scope
This standard specifies the basic requirements, evaluation methods and evaluation procedures for the efficiency evaluation of photovoltaic power generation systems.
This standard applies to the evaluation of the technical and economic efficiency of photovoltaic power generation systems.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 37526 Solar energy resource assessment method
GB 50797 Design Code for Photovoltaic Power Stations
GB/T 6495.3 Photovoltaic devices Part 3.Measurement principles and standard spectral irradiance data of photovoltaic devices for ground use
"Control Indicators for Land Use of Photovoltaic Power Station Projects" (Guo Tu Zi Gui [2015] No. 11)
IEC 61724-1 Photovoltaic system performance-Part 1.Monitoring
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Standard test condition
The battery temperature is 25 ℃, the irradiance is 1000 W/m2, and the air quality is AM1.5.
Note. The spectral irradiance distribution meets the requirements of GB/T 6495.3.
3.2
Nominal power of the rear side of a bifacial PV module
The peak power on the back of the module measured under standard test conditions, in units of peak watts (Wp).
3.3
Installation capacity of PV modules
For single-sided modules, it refers to the sum of the nominal power of the photovoltaic modules installed in the photovoltaic power generation system, and the unit is the peak watt (Wp).
For double-sided modules, the front installation capacity refers to the sum of the nominal power of the front of the photovoltaic modules installed in the photovoltaic power generation system, and the unit is peak
Watt (Wp), its back installation capacity refers to the sum of the nominal power on the back of the photovoltaic modules installed in the photovoltaic power generation system, and the unit is peak watts (Wp).
The installed capacity of a bifacial module photovoltaic power generation system refers to its frontal installed capacity.
3.4
Rated capacity
The sum of the rated active power of the inverters installed in the photovoltaic power generation system, in watts (W).
3.5
PV power to inverter power ratio
The ratio of the installed capacity of the photovoltaic system to the rated capacity.
3.6
Mismatch losses
The series mismatch power loss of all photovoltaic modules in the photovoltaic module branch, the parallel mismatch power loss of the photovoltaic module branch, and the combiner box parallel
The sum of power loss in connection mismatch.
3.7
DC cable losses
The sum of the power loss of all DC cables from the output end of the photovoltaic module to the input end of the inverter.
3.8
AC cable losses
The power loss of all AC cables from the output end of the inverter to the step-up transformer, and the step-up transformer to the grid-connected point in the grid-connected photovoltaic power generation system
with.
3.9
System failure and maintenance losses
Power generation caused by component, inverter, step-up transformer and other equipment failures, maintenance needs, and management problems in the operation of photovoltaic power generation systems
loss.
3.10
System external losses of photovoltaic power generation system
Photovoltaic power generation system due to the power grid, natural disasters and other external factors caused the loss of power generation
3.11
Electric energy tariff point
The property boundary between the photovoltaic power generation system and the grid facilities or the transaction settlement point specified in the contract agreement.
3.12
Levelized cost of energy
The discount ratio of all costs incurred by the photovoltaic power generation system during the evaluation period to the total amount of electricity available to the grid, in yuan per kilowatt-hour
(CNY/kWh).
3.13
System performance
Refers to the annual equivalent utilization hours of photovoltaic power generation systems, system energy efficiency ratio, levelized electricity cost, unit area efficiency, and external benefits
And other indicators.
4 Performance parameters
4.1 Component efficiency
Module efficiency should be the ratio of module power measured under standard test conditions to the product of module area and radiation intensity, the calculation formula
as follows.
4.2 Double-sided ratio of double-sided modules
The double-sided ratio of the double-sided module should be the ratio of the nominal power on the back of the double-sided module to the nominal power on the front of the double-sided module. The calculation formula is as follows.
(2)
4.3 Inverter efficiency
Inverter efficiency includes maximum conversion efficiency and average weighted total efficiency. The maximum efficiency of the inverter is based on the
The test and certification result is confirmed. The average weighted total efficiency of the inverter should be calculated according to the following formula.
Note. G represents the total annual radiation exposure, using the multi-year average (generally the 30-year average), and the unit is megajoules per square meter per year (MJ·m-2·a-1)
4.4 Capacity ratio
The volume ratio should be calculated as follows.
4.5 DC power loss
The DC power loss index of the photovoltaic power generation system should be the sum of all mismatch losses from the component output to the inverter input and the DC line loss
The ratio to the sum of the output power of all components, expressed as a percentage.
4.6 AC power loss
For grid-connected photovoltaic power generation systems, the AC power loss of the photovoltaic power generation system should be all the AC line losses from the output end of the inverter to the grid-connected point
And the ratio of the sum of the power loss of the step-up transformer to the sum of the output power of all inverters, expressed as a percentage.
4.7 Selection of solar resource data for photovoltaic power generation system
The calculated value of solar resources of photovoltaic power generation system should be based on at least one complete year of actual measurement data of the solar radiation field observation station.
Count. When the actual measurement data of the solar radiation field observation station is not available, it can represent the long-term observation data of the weather station or the long-term radiation data calculated by the weather station.
The calculation is based on statistical calculation data based on satellite remote sensing data or physical inversion data. Radiation data measurement and processing should meet IEC
According to 61724-1, the priority level of solar resource data selection for photovoltaic power generation system is shown in Table 3.
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