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GB/T 20320-2023: Wind energy generation systems - Electrical characteristics measurement and assessment of wind turbines
Status: Valid GB/T 20320: Evolution and historical versions
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Wind energy generation systems - Electrical characteristics measurement and assessment of wind turbines
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GB/T 20320-2023
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Measurement and assessment of power quality characteristics of wind turbines generator systems
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The WTG power quality measurement and assessment methods
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Basic data | Standard ID | GB/T 20320-2023 (GB/T20320-2023) | | Description (Translated English) | Wind energy generation systems - Electrical characteristics measurement and assessment of wind turbines | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F11 | | Classification of International Standard | 27.180 | | Word Count Estimation | 122,192 | | Date of Issue | 2023-05-23 | | Date of Implementation | 2023-12-01 | | Older Standard (superseded by this standard) | GB/T 20320-2013 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20320-2023: Wind energy generation systems - Electrical characteristics measurement and assessment of wind turbines
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ICS 27:180
CCSF11
National Standards of People's Republic of China
Replacing GB/T 20320-2013
Electrical Characteristics of Wind Turbines in Wind Power Generation System
Measurement and Evaluation Methods
Windturbines, IDT)
Released on 2023-05-23 Implemented on 2023-12-01
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface IX
Introduction Ⅺ
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Symbols and units 10
5 Abbreviations 11
6 Wind Turbine Specifications 12
7 Test conditions and test system 12
7:1 General 12
7:2 Overview of test levels 12
7:3 Test validity 13
7:4 Test conditions 14
7:5 Test equipment 14
8 Electrical characteristic measurement and test procedure 15
8:1 General 15
8:2 Power quality test 16
8:3 Steady state operation 21
8:4 Control characteristics 27
8:5 Dynamic performance 36
8:6 Off-grid test 42
Appendix A (Informative) Report Format Sample 47
A:1 Overview 47
A:2 Basic information of test items 47
A:3 Power Quality Test 48
A:4 Steady-state operation 58
A:5 Dynamic performance (see 8:5) 73
A:6 Off-grid protection (see 8:6) 78
Appendix B (Informative) Voltage Fluctuation and Flicker 82
B:1 Continuous operation 82
B:2 Switch operation 82
B:3 Confirmatory tests for flicker measurement procedures 83
B:4 Detailed definition 86
Appendix C (Normative) Active Power, Reactive Power and Voltage Measurements 88
C:1 General 88
C:2 Reference direction according to Generator Practice 88
C:3 Calculation of positive, negative and zero sequence components 89
Appendix D (Informative) Harmonic Evaluation 94
D:1 General principles 94
D:2 General analytical methods 94
D:3 Determination of harmonic amplitudes affected by space harmonics in DFAG systems 101
Appendix E (informative) Wind turbines and wind farm power quality assessment 102
E:1 General 102
E:2 Voltage fluctuations 102
E:3 Current harmonics, interharmonics and high-frequency components 104
Appendix F (Informative) Guidelines for Citing Test Results of Different Wind Turbine Generating Sets on the Same Product Platform 105
References 108
Figure 1 Step response example 8
Figure 2 Main parts of the measurement system 15
Fig:3 Schematic diagram of virtual grid used for virtual voltage simulation16
Figure 4 Corresponding curve of active power and wind speed (example) 22
Figure 5 Number of measured data in each wind speed interval (example) 23
Figure 6 Number of measured data in each power interval (example) 23
Fig:7 Example of PQ curves of wind turbines at different voltage levels26
Figure 8 Schematic diagram of active power reference value adjustment 28
Figure 9 Example of active power step response 28
Figure 10 Example of available active power and measured active power curves in ramp rate limiting mode30
Figure 11 Examples of active power control functions according to different measurement points and reference frequency step values31
Figure 12 Integrated inertia - definition 34
Figure 13 Static error test 35
Figure 14 Dynamic response test (example) 35
Figure 15 Example of low voltage ride through test equipment 37
Fig:16 Positive sequence voltage error band of low voltage disturbance when wind turbine is unloaded38
Figure 17 Error band of high voltage disturbance positive sequence voltage 38
Figure 18 Example of resistance-capacitance high voltage ride-through test unit 39
Figure 19 Example of low voltage ride through test diagram 40
Figure 20 Example of high voltage ride through test diagram 41
Figure 21 Example of overvoltage or overfrequency step ramp test 44
Figure 22 Example of overvoltage or overfrequency pulse ramp test 44
Figure 23 Example of release time test 45
Figure A:1 Voltage short-term flicker value changes with active power Figure 49
Figure A:2 Flicker coefficient changes with active power when the grid impedance phase angle is 30° Figure 49
Figure A:3 Flicker coefficient changes with active power when the grid impedance phase angle is 50° Figure 49
Figure A:4 Flicker coefficient changes with active power when the grid impedance phase angle is 70° Figure 49
Figure A:5 Flicker coefficient changes with active power when the grid impedance phase angle is 85° Figure 49
Figure A:9 Time series of starting three-phase voltage effective value at rated active power Figure 51
Figure A:10 Time series of starting three-phase current effective value at rated active power Figure 51
Figure A:11 Start active power and reactive power time series at rated active power Figure 51
Figure A:12 Time series of three-phase voltage effective value when generator 1 is switched to 2 Figure 52
Figure A:13 Time series of three-phase current RMS value when generator 1 is switched to 2 Figure 52
Figure A:14 Time series of active power and reactive power when generator 1 is switched to 2 Figure 52
Figure A:15 Three-phase voltage time series when generator 2 is switched to 1 Figure 52
Figure A:16 Three-phase current time series when generator 2 is switched to 1 Figure 53
Figure A:17 Time series of active power and reactive power when generator 2 is switched to 1 Figure 53
Figure A:18 The maximum value of the 95% quantile of each harmonic current 58
Figure A:19 The maximum value of the 95% quantile of harmonic currents between frequencies 58
Figure A:20 The maximum value of the 95% quantile of the current high-frequency component at each frequency 58
Figure A:21 Power curve 59
Figure A:22 Reactive power and active power 60
Figure A:23 PQ curve 60
Figure A:24 PQ curve at maximum voltage 61
Figure A:25 PQ curve at minimum voltage 62
Figure A:26 1min average current unbalance degree changes with active power Figure 62
Figure A:27 Active power reference value, available power and measured power time during static error evaluation test in active power control mode
sequence 63
Figure A:28 In the active power control mode, the wind speed time series during the static error evaluation test 63
Figure A:29 Active power reference value, available power and measured power time during the settling time test in active power control mode
sequence 63
Figure A:30 Active power ramp rate limiting test period, available active power and measured active power time series 64
Figure A:31 During the active ramp rate limit test, the wind speed time series 64
Figure A:32 Time series of available active power and measured active power during the ramp rate limit test 65
Figure A:33 During the ramp rate limit test, the wind speed time series 65
Figure A:34 Time series of available active power and measured active power during the ramp rate limit test 66
Figure A:35 During the ramp rate limit test, the wind speed time series 66
Figure A:36 Time series of available active power and measured active power during ramp rate limiting test 66
Figure A:37 During the ramp rate limit test, the wind speed time series 67
Figure A:38 During grid frequency change, available active power, measured active power and reference active power time series 67
Figure A:39 Wind speed time series 68
Figure A:40 Measured value of active power changing with frequency 68
Figure A:41 During the grid frequency change, available active power, measured active power and reference active power time series 68
Figure A:42 Wind speed time series 68
Figure A:43 Measured value of active power changing with frequency 69
Figure A:44 Test 1: When 0:25Pn< P< 0:5Pn, available active power, measured active power, grid frequency reference value time
sequence 69
Figure A:45 Test 1: When 0:25Pn< P< 0:5Pn, wind speed time series 70
Figure A:46 Test 2: When 0:25Pn< P< 0:5Pn, available active power, measured active power, grid frequency reference value time
sequence 70
Figure A:47 Test 2: When 0:25Pn< P< 0:5Pn, wind speed time series 70
Figure A:48 Test 3: When P > 0:8Pn, time series of available active power, measured active power and grid frequency reference value 70
Figure A:49 Test 3: When P >0:8Pn, wind speed time series 70
Figure A:50 Test 4: When P > 0:8Pn, time series of available active power, measured active power and grid frequency reference value 70
Figure A:51 Test 4: When P >0:8Pn, wind speed time series 71
Figure A:52 Test 5: when v > vn, time series of available active power, measured active power, grid frequency reference value 71
Figure A:53 Test 5: When v > vn, wind speed time series 71
Figure A:54 Test 6: When v > vn, time series of available active power, measured active power and grid frequency reference value 71
Figure A:55 Test 6: when v > vn, wind speed time series 71
Figure A:56 During the reactive power control test, the time series of reactive power reference values and measured values is shown in Figure 72
Figure A:57 During reactive power control test, active power time series Figure 72
Figure A:58 During the reactive power dynamic response test, the time series of reactive power reference values and measured values Figure 73
Figure A:59 During reactive power dynamic response test, active power time series Figure 73
Figure A:60 Three-phase voltage waveform during voltage drop/rise when the wind turbine under test is not connected to the grid 74
Figure A:61 Three-phase voltage waveform during the recovery period after the voltage drop/rise when the wind turbine under test is not connected to the grid 74
Figure A:62 When the wind turbine under test is not connected to the grid, the effective value of the three-phase voltage during the test (one cycle) 74
Figure A:63 When the wind turbine under test is not connected to the grid, the positive sequence component of the voltage during the test is 75
Figure A:64 Three-phase voltage waveform during voltage drop/rise period when the wind turbine unit under test is connected to the grid 76
Figure A:65 Three-phase voltage waveform during the recovery period after the voltage drop/rise when the measured wind turbine is connected to the grid 76
Figure A:66 When the tested wind turbine is connected to the grid, the effective value of the three-phase voltage during the test (one cycle) 76
Figure A:67 When the wind turbine under test is connected to the grid, the fundamental positive-sequence and negative-sequence voltages during the test period 77
Figure A:68 When the tested wind turbine is connected to the grid, the effective value of the three-phase current during the test (one cycle) 77
Figure A:69 When the wind turbine under test is connected to the grid, the fundamental positive sequence and negative sequence currents during the test period 77
Figure A:70 When the wind turbine under test is connected to the grid, the fundamental positive sequence active power during the test period is 77
Figure A:71 When the wind turbine under test is connected to the grid, the fundamental positive sequence reactive power during the test period is 77
Figure A:72 When the wind turbine under test is connected to the grid, the fundamental positive-sequence active current during the test period is 77
Figure A:73 When the wind turbine under test is connected to the grid, the fundamental positive sequence reactive current during the test period is 78
Figure A:74 When the wind turbine under test is connected to the grid, the wind speed or available power during the test78
Figure A:75 Voltage time series during 10s fault reconnection test 80
Figure A:76 Time series of active power during 10s fault reconnection test (including recovery phase) 80
Figure A:77 Wind speed time series during 10s fault reconnection test 80
Figure A:78 Voltage time series during 60s fault reconnection test 80
Figure A:79 Active power time series during 60s fault re-connection test (including recovery phase) 80
Figure A:80 Wind speed time series during 60s fault reconnection test period 80
Figure A:81 Voltage time series during 600s fault reconnection test 81
Figure A:82 600s fault reconnection test period (including recovery phase) active power time series 81
Figure A:83 Wind speed time series during 600s fault reconnection test period 81
Figure B:1 Measurement procedure for wind turbine flicker during continuous operation 82
Figure B:2 Measurement procedure for wind turbine voltage variation and flicker during switching operation 83
Figure C:1 When the generator convention is adopted, the positive direction of the instantaneous phase current of active power, reactive power and instantaneous phase voltage 88
Figure C:2 Example of power phasors in each quadrant corresponding to instantaneous phase voltage and current when the generator convention is adopted 89
Figure D:1 Definition of spectral line phase angle under the generator convention (taking the fifth harmonic αI5= 120° and αU5= 170° as an example, so the fifth
The harmonic phase angle is φ5= 170°-120°= 50°) 95
Figure D:2 Aggregated harmonic amplitude (dotted line) in the 10s interval and the amplitude calculated directly from the DFT10 period window without aggregation
(dotted line) compare 96
Figure D:3 Comparison of dominant phase angle ratio (PAR) 97
Figure F:1 Block diagram of a general-purpose wind turbine (source IEC 61400-27-1) 106
Table 1 Test Level 12
Table 2 Requirements for measuring equipment15
Table 3 Statistics of the number of 10-min measurement data in each wind speed interval 22
Table 4 Statistics of the number of measured data in each power range (10min average value) 23
Table 5 Maximum measured active power value 24
Table 6 Test results of active power control accuracy 29
Table 7 Test results of active power reference value 29
Table 8 Calculation of active power ramp rate31
Table 9 Frequency-dependent active power adjustment function setting example 33
Table 10 Static error test 36
Table 11 Dynamic response test 36
Table 12 Voltage drop example 40
Table 13 Example of voltage increase 41
Table 14 Grid Protection Test 43
Table A:1 Report Basic Information 47
Table A:2 main data 47
Table A:3 Rated parameters 48
Table A:4 Test conditions 48
Table A:5 Flicker coefficient of each power range (95% percentile) 48
Table A:6 Start 50 when cutting into the wind speed
Table A:7 Starting at rated active power 51
Table A:8 Start-up under the worst working condition when the generator is switched 52
Table A:9 Basic test information 53
Table A:10 10min harmonic components (95% percentile) in each power range 53
Table A:11 Harmonic components (95% percentile) between 10 min in each power range 55
Table A:12 10min high-frequency components (95% percentile) in each power range 56
Table A:13 Variation of active power with wind speed 58
Table A:14 Test data power interval distribution 58
Table A:15 Maximum active power 59
Table A:16 Reactive power characteristics 59
Table A:17 PQ curve 60
Table A:18 PQ curve at maximum voltage 61
Table A:19 PQ curve at minimum voltage 61
Table A:20 P-IUFi 62
Table A:21 Basic test information 63
Table A:22 static error 63
Table A:23 Dynamic response 63
Table A:24 Basic test information 64
Table A:25 Calculated value of active power ramp rate at startup 64
Table A:26 Basic test information 64
Table A:27 Start-up, active power ramp rate limit 65
Table A:28 Basic test information 65
Table A:29 During normal shutdown, active power ramp rate limit 65
Table A:30 Basic test information 66
Table A:31 During normal operation, active power ramp rate limit 66
Table A:32 Basic test information 67
Table A:33 When 0:25Pn< P< 0:5Pn, test 67
Table A:34 When P >0:8Pn, test 68
Table A:35 Comprehensive inertia test results 69
Table A:36 Basic test information 72
Table A:37 Static error 72
Table A:38 Dynamic response 73
Table A:39 Test results when the wind turbine is not connected to the grid 73
Table A:40 Test results when wind turbines are connected to the grid 75
Table A:41 Voltage protection test results 78
Table A:42 Frequency protection test results 78
Table A:43 Complete protection circuit test results 79
Table A:44 Rate of Change of Frequency (RoCoF) Test Results 79
Table A:45 Rate of Change of Frequency (RoCoF) test information 79
Table A:46 Re-connection test results 79
Table B:1 The rated value of the wind turbine during the confirmatory test 83
Table B:2 Relative current fluctuation input value corresponding to flicker coefficient c(ψk)=200×(1±5%) when Sk,fic=20Sn 84
Table B:3 When Sk,fic=50Sn, relative current change input value corresponding to flicker coefficient c(ψk)=200×(1±5%) 84
Table B:4 Test specifications for distorted voltages with multiple zero crossings 85
Table D:1 Example of measurement results 100
Table E:1 Index parameters (IEC TR61000-3-6) 104
Table F:1 Main components affecting the electrical performance of wind turbines 106
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents"
drafting:
This document replaces GB/T 20320-2013 "Wind Turbine Power Quality Measurement and Evaluation Method", and GB/T 20320-
Compared with:2013, in addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) Added "off-grid time", "rated active power", "reactive power capability", "short-circuit ratio", "voltage drop", "voltage increase", "fault wear-through
"Over", "Low Voltage Ride Through", "High Voltage Ride Through", "Phasor", "Fundamental Positive Sequence Component", "Fundamental Negative Sequence Component", "Fundamental Zero Sequence
Balance", "Control Interface", "Wind Farm", "Assessor", "Time Series", "Short Circuit Capacity", "Percentile", "Comprehensive Inertia", "Static
Error", "Response Time", "Stable Time", "Rise Time", "Overshoot", "Reaction Time", "Fall Time", "Recovery Time", "Steady State"
"Error Band" "Event Start Time" "Wind Turbine Product Platform" "Component Test" "Subsystem" "Subsystem Test" "Available
Active power", "Power factor", "Ramp rate", "Reference value", "Active power range", "Virtual grid", "On-site measurement", "On-site measurement
"Test" and "wind speed range" terms and definitions (see 3:3, 3:15, 3:16, 3:20, 3:26, 3:27, 3:28, 3:29, 3:30, 3:31, 3:32,
3:33, 3:34, 3:35, 3:36, 3:37, 3:38, 3:39, 3:40, 3:41, 3:42, 3:43, 3:44, 3:45, 3:46, 3:47, 3:48, 3:49,
3:50, 3:51, 3:52, 3:53, 3:54, 3:55, 3:56, 3:57, 3:58, 3:59, 3:60, 3:61, 3:62, 3:63, 3:64, 3:65, 3:66);
b) The terms and definitions of "common connection point", "power collection system", "rated current", "rated wind speed" and "switching operation" have been changed (see 3:11,
3:12, 3:14, 3:17, 3:21, 3:10, 3:11, 3:13, 3:15, 3:18 of the:2013 edition);
c) Delete the term "rated power" (see 3:14 of the:2013 edition);
d) Added "finertia,recovery" "finertia,trigger" "fsim" "HW" "IUF" "PF" "SW" "Umin" "Umax" "UUVRC" "UOVRC"
"Upre" symbol (see Chapter 4);
e) The symbols "fm,i" "fy,i" "Nbin" "Nm,i" "Nm,i,c< x" "va" "vi" "ωi" are deleted (see Chapter 4 of the:2013 edition) ;
f) Added the abbreviations "DFAG" and "RoCoF" (see Chapter 5);
g) The abbreviation "PCC" has been deleted (see Chapter 5 of the:2013 edition);
h) Added the requirement of "test level" (see 7:2);
i) The test requirements and test methods for voltage-related PQ curves and unbalance degree are added (see 8:3:6, 8:3:7);
j) Added test requirements and test methods for frequency control and integrated inertia (see 8:4:4, 8:4:5);
k) Added test requirements and test methods for high voltage ride-through (see 8:5:2);
l) Added the test requirements and test methods for frequency rate-of-change protection (see 8:6:3):
This document is equivalent to IEC 61400-21-1:2019 "Wind energy generation system - Part 21-1: Electrical characteristics measurement and evaluation of wind power
Generator Set":
The following minimal editorial changes have been made to this document:
--- In order to coordinate with existing standards, the name of the standard was changed to "Measurement and Evaluation Method for Electrical Characteristics of Wind Turbine Generator Sets in Wind Power Generation System":
Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed by China Machinery Industry Federation:
This document is under the jurisdiction of the National Wind Power Standardization Technical Committee (SAC/TC50):
This document was drafted by: China Electric Power Research Institute Co:, Ltd:, CRRC Shandong Wind Power Co:, Ltd:, State Grid Jilin Electric Power Co:, Ltd:
Electric Power Research Institute, Zhejiang Wind Power Co:, Ltd:, Siemens Gamesa Renewable Energy Technology (China) Co:, Ltd:, Weiss
Tass Technology Research and Development (Beijing) Co:, Ltd:, Envision Energy Co:, Ltd:, Xinjiang Goldwind Technology Co:, Ltd:, China Huaneng Group Clean Energy Co:, Ltd:
Source Technology Research Institute Co:, Ltd:, Shanghai Electric Wind Power Group Co:, Ltd:, Harbin Electric Wind Energy Co:, Ltd:, China Shipbuilding Industry Corporation Haizhuang
Wind Power Co:, Ltd:, Chongqing University, Guodian United Power Technology Co:, Ltd:, Longyuan Power Group Co:, Ltd:, Beijing Huizhi Tianhua
New Energy Technology Co:, Ltd:, State Power Investment Group Co:, Ltd:, Mingyang Smart Energy Group Co:, Ltd:, State Grid Ningxia Electric Power Co:, Ltd:
Electric Power Research Institute, Shenzhen Hopewind Electric Co:, Ltd:, Dongfang Electric Wind Power Co:, Ltd:, Sany Heavy Energy Co:, Ltd:
Division, Beijing Jianheng Certification Center Co:, Ltd:, China Quality Certification Center, Zhejiang University, Sungrow Power Supply Co:, Ltd:, Shanghai Energy Technology
Development Co:, Ltd:, CRRC Zhuzhou Electric Locomotive Research Institute Co:, Ltd: Wind Power Division:
The main drafters of this document: Qin Shiyao, Xu Ting, Zhao Lei, Lu Xiangyu, Xu Guodong, Li Yue, Chen Qiang, Zhao Bingjie, Huang Yuanyan, Jiao Chong, Zhu Zhiquan,
Qi Chen, Wang Ruiming, Chen Chen, Li Dexin, Zhang Haifeng, Yu Qingqing, Song Xiaoping, Yang Jing, Zheng Jie, Chen Wenchao, Liu Junqi, Chen Danghui, Zhang Chong, Shi Junwei,
Tang Binwei, Guo Jiangtao, Li Gangqiang, Sun Dawei, Liang Jian, Zhang Shuang, Wang Wenyue, Yan Jiaming, Wang Sufei, Lu Yihang, Qiang Xichen, Yuan Xu, Zeng Xingguo,
Wei Ru, Zhao Yu, Wu Lijian, Meng Xiangzhi, Deng Yi, Tang Jianping, Wu Ranghui, Dai Linwang, Zhang Li:
This document was first released in:2006, revised for the first time in:2013, and this is the second revision:
Introduction
This document provides a unified approach to ensure consistency and accuracy in the reporting, testing and evaluation of electrical characteristics of grid-connected wind turbines:
accuracy: This document will apply to the following parties in the wind power industry:
---Wind turbine manufacturers, providing wind turbines that meet the requirements of electrical characteristics;
--- Wind turbine owners, specify the requirements for the electrical characteristics of wind turbines;
--- The operator of the wind turbine, confirming the compliance of the specification or electrical characteristics of the wind turbine;
---Wind turbine planning supervision department, accurately and fairly judges that the installation process of wind turbines meets the design requirements, voltage quality
meet deadline;
---Wind turbine certification testing agency, to evaluate the electrical characteristics of this type of wind turbine;
---The power grid planning and dispatching department has the right to decide whether the wind turbines can be connected to the grid:
This document provides measurement and evaluation methods for the electrical characteristics of grid-connected wind turbines, which will be beneficial to the production and installation of wind turbines
Planning, licensing, operation, use, testing and commissioning: All parties involved in the wind power industry should use the measurement and analysis techniques described in this document,
To ensure consistency and accuracy in the continued development and operation of wind turbines:
The measurement and analysis procedures in this document ensure consistency of test results: Any part of the test content can be carried out independently and issued
Report:
Electrical Characteristics of Wind Turbines in Wind Power Generation System
Measurement and Evaluation Methods
1 Scope
This document specifies the definitions, measurement procedures and evaluation methods of the electrical characteristic parameters of wind turbines: content include:
---Definition and quantitative description of electrical characteristic parameters of grid-connected wind turbines;
--- Measurement procedures for quantifying electrical characteristic parameters;
--- Grid-connected standard compliance assessment procedures, such as evaluating the power quality of a certain type of wind turbine installed in a specific site:
The measurement procedures in this document apply to a single wind turbine connected to the grid in three phases: This document only requires grid-connected wind power
The wind turbines are tested and evaluated, but the measurement procedure is applicable to wind turbines of any capacity:
The measured characteristic parameters are only valid for the evaluated wind turbine product platform with specific configuration and operation mode: If an item is tested
The characteristics are determined by the control parameters and can affect the operating status of the wind turbine, and should be marked in the test report: For example: disconnection of power grid protection
The grid level is related to the parameters of the unit, and the test results are only used to verify whether the grid protection function is normal, and there is no need to measure the specific protection value:
The designed measurement procedure has nothing to do with the measurement site as far as possible, so as to ensure that the conclusions of the electrical characteristic parameters measured in a certain test site are consistent:
Subject to venue restrictions:
This document applies to wind turbines that are connected to a frequency-stabilized grid through a point of common connection:
Note: In this document, the system voltage level uses the following terms:
---Low voltage (LV), Un≤1kV;
---Medium voltage (MV), 1kV< Un≤35kV;
---High voltage (HV), 35kV< Un≤220kV;
---Extra high voltage (EHV), Un >220kV:
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document
document:
IEC TR61000-3-7 Electromagnetic Compatibility (EMC) Part 3-7: Limits for installation in medium-voltage, high-voltage and extra-high voltage power systems
IEC 61000-4-7:2002/AMD1:2008 Electromagnetic Compatibility (EMC) Part 4-7: Testing and Measurement Techniques for Power Supply Systems
Note: GB/T 17626:7-2017 Electromagnetic Compatibility Test and Measurement Technology Power Supply System and Connected Equipment Harmonic and Interharmonic Measurement and Measuring Instrument Guide
Then (IEC 61000-4-7:2009, IDT)
IEC 61000-4-15:2010 Electromagnetic Compatibility (EMC) Part 4-15: Test and Measurement Techniques Flicker Meter Function and Design
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