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NB/T 31041-2019: Technical specification for converter of offshore doubly-fed wind turbine generator
Status: Valid NB/T 31041: Evolution and historical versions
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Technical specification for converter of offshore doubly-fed wind turbine generator
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NB/T 31041-2019
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| NB/T 31041-2012 | English | 959 |
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Converter of offshore doubly-fed wind turbine generator
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Basic data | Standard ID | NB/T 31041-2019 (NB/T31041-2019) | | Description (Translated English) | Technical specification for converter of offshore doubly-fed wind turbine generator | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | K46 | | Classification of International Standard | 29.120.01 | | Word Count Estimation | 28,217 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | NB/T 31041-2019: Technical specification for converter of offshore doubly-fed wind turbine generator
---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.
Technicalspecificationforconverter of offshore doubly-fed wind turbine generator
NB
ICS 29.120.01
K 46
Energy Industry Standards of the People's Republic of China
Replace NB/T 31041-2012
Technical specification for offshore doubly-fed wind turbine converter
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 Technical requirements...3
5 Test method...9
6 Inspection Rules...18
7 Marking, packaging, storage and transportation...20
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces NB/T 31041-2012 "Offshore Doubly Fed Wind Turbine Converter". Compared with NB/T -31041-2012, this standard mainly
The changes are as follows.
--Modified the standard name, the original "Offshore Doubly Fed Wind Turbine Converter" was renamed as "Offshore Doubly Fed Wind Turbine Converter Technology"
specification";
--The scope of Chapter 1 is revised. This standard is applicable to AC, DC, and AC voltage source low-voltage converters in offshore doubly-fed wind turbines. sea
The medium voltage converter in the upper doubly-fed wind turbine can be implemented with reference to this standard;
--The following standards in the normative references in Chapter 2 are deleted.
GB 14048-2006 Low-voltage switchgear and control equipment Part 1;
GB 18451.1-2001 Safety requirements for wind turbines;
GB/T 5226.1-2008 Electrical Safety of Machinery, Electrical Equipment of Machinery Part 1.General Technical Requirements;
--Added the following standards in the normative references in Chapter 2.
NB/T 31054-2014 wind turbine grid adaptability test procedure
NB/T 31111-2017 Wind turbine high voltage ride through test regulations;
GB/T 4768-2008 Anti-mold packaging;
GB/T 4879-2016 Anti-rust packaging;
GB/T 5048-2017 moisture-proof packaging;
GB/T 7350-1999 waterproof packaging;
GB/T 8166-2011 Cushion packaging design;
NB T/T 31094-2016 Special offshore environmental conditions and technical requirements for wind power equipment;
--Added the power factor, common mode voltage, differential mode voltage, du/dt value of the power grid in terms and definitions (see Chapter 3);
--- Added 4.1.1 product type mixed cooling type classified by power module cooling method
- Deleted the rated capacity (MW) of the supporting unit;
--- Modify 4.3.1 c) Dehumidification device should be installed inside the cabinet;
--- Deleted the 4.3.1 structure and appearance requirements of the top of the cabinet to be equipped with lifting rings;
--- Added clauses c) and d) of 4.3.3 electrical connection requirements;
- Modified 4.3.7 The overload capacity needs to be under rated operating conditions;
--Added 4.3.8 medium over/under frequency protection, grid power failure protection, grid current imbalance protection, power device hardware protection;
-Modified 4.3.9 The temperature rise should be under the operating conditions of nominal current;
--- Added the temperature rise standard for copper-aluminum composite row in Table 3;
-Deleted the temperature rise requirements of the surge protector and the resistance element of the main circuit in Table 3;
--Added 4.3.13 common mode voltage, 4.3.14 differential mode voltage, 4.3.15du/dt value requirements;
--Modified 4.3.16, the efficiency is not less than 97%;
--Modified 4.3.21 The adaptability of the grid should meet the requirements of GB/T.19963, and the manufacturer should consult with the manufacturer if this condition is exceeded;
--- Added 4.3.22 fault ride-through capability requirements;
--- Amended 4.3.29 The noise sound pressure level emitted by the converter should not be greater than 80 dB(A);
--- Modify the speed and power curve of the doubly-fed generator in Figure 2 in 5.3.8;
--- Added 5.3.15 common mode voltage test, 5.3.16 differential mode voltage test, 5.3.17du/dt value test, 5.3.24 fault ride-through capability
Test, 5.3.33 storage test and other test methods;
--Modify the 5.3.23 grid adaptability test to comply with the relevant requirements of BB/T 31054-2014, in the main control system of the unit
Closed, the manufacturer and the user cooperate;
-Modified 5.3.27 alternating damp heat test, the severity is. high temperature is 45℃;
--- Added 6.2.1 general requirements;
--- Added 6.2.2 grounding requirements;
- Modified Table 6 load control function test as type test;
--- Added 7.2.2 product packaging;
This standard was proposed by China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the Wind Power Electrical Equipment Subcommittee (NEA/TC1/SC6) of the Wind Power Standardization Technical Committee of the Energy Industry.
The main drafting organizations of this standard. Beijing Goldwind Technology Electrical Equipment Co., Ltd., Beijing Institute of Electrical Technology and Economics, Shanghai
Electric Power Transmission and Distribution Group Co., Ltd., Shanghai Electric Wind Power Group Co., Ltd., Mingyang Smart Energy Group Co., Ltd., Guodian United Power Technology
Technology Co., Ltd., Zhejiang Haide New Energy Co., Ltd., Tianjin Ruineng Electric Co., Ltd., Xuchang Kaipu Testing and Research Institute Co., Ltd.,
Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd., National Electric Control Distribution Equipment Quality Supervision and Inspection Center.
Participated in the drafting of this standard. China Electric Power Research Institute Co., Ltd., North China University of Technology, Envision Energy (Jiangsu) Co., Ltd.,
Huarui Wind Power Technology (Group) Co., Ltd., Zhejiang Yunda Wind Power Co., Ltd., Beijing Tiancheng Tongchuang Electric Co., Ltd., Suzhou
Electrical Equipment Research Institute Co., Ltd., China Quality Certification Center, Shenzhen Hewang Electric Co., Ltd., Beijing Jianheng Certification Center
Co., Ltd., Jiangsu Goldwind Technology Co., Ltd.
Drafters of this standard. Ma Zhongbao, Guo Yan, Sun Jinying, Chen Kunming, Wang Ruiming, Zhang Li, Yuan Guofeng, Chu Jingchun, Guo Liang, Zhang Xinqiang,
Liu Peng, Wang Feng, Yang Caijian, Xiang Feng, Yu Qing, Ren Gaoquan, Wang Jianghua, Wang Lianjie, Wang Yanhua, Yang Zhifeng, Zhao Yu, Zhou Dangsheng, Li Hao
Ran, Bai Xiaogang, Liu Zhi.
The previous editions of the standard replaced by this standard are as follows.
Technical specification for offshore doubly-fed wind turbine converter
1 Scope
This standard specifies the terms and definitions, technical requirements, and tests of offshore doubly-fed wind turbine converters (hereinafter referred to as "converters")
Methods, inspection rules, etc.
This standard applies to AC, DC, and AC voltage source low-voltage converters in offshore doubly-fed wind turbines. In offshore double-fed wind turbine
The medium voltage converter can be implemented with reference to this standard.
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 article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 191 Packaging, Storage and Transportation Graphic Mark
GB/T 2423.1 Environmental testing of electrical and electronic products Part 2.Test method Test A. Low temperature
GB/T 2423.2 Environmental testing of electrical and electronic products Part 2.Test method Test B. High temperature
GB/T 2423.4 Basic environmental test procedures for electrical and electronic products Part 2.Test methods Test Db. Alternating damp heat (12h + 12h
cycle)
GB/T 2423.16 Environmental testing of electrical and electronic products Part 2.Test method Test J and guideline. Mold growth
GB/T 2423.18 Environmental test Part 2.Test method Test Kb. Salt spray, alternating (sodium chloride solution)
GB/T 2900.33 Electrical Engineering Terminology Power Electronic Technology
GB/T 2900.53 Electrical terminology wind turbine
GB/T 3783-2008 Basic requirements for marine low-voltage electrical appliances
GB/T 3797-2016 Electrical control equipment
GB/T 3859.1-2013 Basic requirements for semiconductor converters
GB/T 4208 Shell protection grade (IP code)
GB/T 4768-2008 Anti-mold packaging
GB/T 4879-2016 Anti-rust packaging
GB/T 5048-2017 moisture-proof packaging
GB/T 5169.5 Fire hazard test for electrical and electronic products-Part 5.Test flame needle flame test method device, confirmation test method
And guidelines
GB/T 5169.11 Fire hazard test for electric and electronic products Part 11.Glow wire/hot wire basic test method
Flammability test method
GB/T 5169.21 Fire hazard test for electric and electronic products Part 21.Abnormal hot bulb pressure test
GB/T 7094 Vibration (sinusoidal) test method for marine electrical equipment
GB/T 7350-1999 Waterproof packaging
GB/T 8166-2011 Cushioning packaging design
GB/T 12668.2-2002 Speed control electric drive system Part 2.General requirements for the rated value of low-voltage AC variable frequency electric drive system
Stipulate
GB/T 12668.3-2012 Adjustable speed electric drive system Part 3.Electromagnetic compatibility standards of products and specific test methods
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 13422-2013 Electrical test methods for semiconductor power converters
GB/T 15543-2008 Power quality three-phase voltage unbalance
GB 18802.1 Surge Protective Devices (SPD) for Low-Voltage Distribution Systems Part 1.Performance Requirements and Test Methods
GB/T.19963 Technical Regulations for Connecting Wind Farms to Power Systems
GB/T 20320-2013 Wind turbine power quality measurement and evaluation method
GB/T 21714.1 Lightning Protection Part 1.General
GB/T 21714.4 Lightning Protection Part 4.Electrical and Electronic Systems in Buildings
GB/T 23479.1 Double-fed asynchronous generators for wind turbines Part 1.Technical conditions
JB/T 5777.2-2002 General technical requirements for control and relay protection screens (cabinet, platform) for secondary circuits in power systems
NB/T 31014 Technical specification for doubly-fed wind turbine converter
NB/T 31051 Wind Turbine Generator Low Voltage Ride Through Capability Test Procedure
NB/T 31054-2014 wind turbine grid adaptability test procedure
NB/T 31094-2016 Special offshore environmental conditions and technical requirements for wind power equipment
NB/T 31111 Wind Turbine Generator High Voltage Ride Through Test Procedure
3 Terms and definitions
Defined by GB/T 3859.1-1993, GB/T 2900.33, GB/T 2900.53, GB 18802.1, GB/T.19963 and NB/T 31014
And the following terms and definitions apply to this document.
3.1
Converter control unit(CCU)
The control system of the converter, which mainly includes the core processor, coprocessor, input and output interface, communication interface, etc., is to control the converter
An important component that completes various functions and performs data interaction with related peripherals.
3.2
Redundancy
Repeatedly configure some components of the system. When the system fails, the redundantly configured components intervene and assume the work of the failed component, thereby reducing
Less system downtime.
3.3
Line-side converter power factor
The ratio of active power to apparent power at the AC side of the grid-side converter.
3.4
Commonmode voltage
The average value of the phasor voltage that appears between each conductor and the specified reference point (usually the ground or the frame). Or add at the same time
One third of the input voltage between the two measurement terminals of the voltmeter and the specified common terminal, that is, (Va Vb Vc)/3.
3.5
Differential mode voltage
The potential difference between phases.
3.6
4 Technical requirements
4.1 Product type and main parameters
4.1.1 Product Type
The product types are divided into.
a) According to the ambient temperature, it is divided into normal temperature type and low temperature type;
b) According to the cooling method of the power module, it is divided into air-cooled, liquid-cooled, mixed-cooled, etc., and the liquid-cooled type should be adopted.
4.1.2 Grid side voltage level (kV)
The grid side voltage level of the converter preferentially adopts the following series.
Note. The voltage level beyond the above priority series is determined by the user and the manufacturer through negotiation.
4.2 Conditions of use
4.2.1 Environmental conditions for normal use
a) According to 4.2 of NB/T 31094-2016, the ambient temperature for normal use of the converter is divided into.
Normal temperature type. -10 ℃～＋45 ℃.
Low temperature type. -20 ℃～＋45 ℃;
b) Relative air humidity. ≤95% (when below 20 ℃);
c) Altitude. ≤1000 m;
d) Influence of salt spray. Yes;
e) Mould influence. Yes.
4.2.2 Normal test environmental conditions
Mainly including the use of climatic conditions, the converter should be tested under the following atmospheric environment.
a) Ambient temperature. -5 ℃～40 ℃;
b) Relative humidity. 30%～90% (below 20℃);
c) Atmospheric pressure. 86kPa～106kPa.
4.2.3 Ambient temperature during storage and transportation
The limit temperature range of ambient air during storage and transportation of the converter is. -40 ℃ ~ +70 ℃.
4.2.4 Electrical conditions for normal use
4.2.4.1 Grid frequency variation range
The range of power grid frequency. 47.5 Hz～51.5 Hz.
4.2.4.2 Grid voltage fluctuation range
If the grid voltage is within ±10% of the rated value, the converter should be able to operate normally.
When the grid voltage exceeds the above range, the user shall negotiate with the manufacturer.
4.2.4.3 Grid voltage unbalance
According to the provisions of GB/T 15543-2008 in 4, the voltage unbalance of the power grid should not exceed 2%, and it should not exceed 4% in a short time.
4.3 Performance requirements
4.3.1 Structure and appearance requirements
a) The cabinet body should adopt steel anti-corrosion design;
b) The cabinet is provided with a public grounding point, and all parts of the cabinet shall be well connected to the public grounding point, and electric shock prevention measures shall be provided.
Complete protective grounding;
c) Dehumidification device should be installed inside the cabinet;
d) The power supply of the internal control unit of the cabinet should be powered by a shielded isolation transformer;
e) The cabinet design should meet the installation and maintenance requirements in the tower and engine room, and be easy to install, debug and maintain;
f) The selection and installation process of buttons, switches, display screens, signal lights and alarm devices of the cabinet, as well as the way of entering and exiting the cabinet
Should match the protection level of the cabinet;
g) The cabinet has a firm structure and should be able to withstand the influence of electricity, heat, mechanical strength and vibration on the equipment in the operating environment;
h) The operating device should be installed in a position that is easy for the operator to operate, and the emergency stop button should be placed in the most conspicuous and easy-to-operate position of the cabinet.
And the button itself is equipped with a protective cover;
i) The surface of the cabinet body should be smooth and without unevenness, and coating treatment should be adopted, and the color of the paint layer should be uniform, and there should be no blistering, cracks and flow.
The cabinet door should be able to open and close flexibly within an angle of not less than 90 degrees;
j) The cabinet structure should be simple and open, easy to reach, and the corrosion-prone surface design should be as smooth as possible. Any necessary reinforcements,
Joints and pipes should be arranged as far as possible in places with low corrosion risk, and hollow parts that are difficult to maintain should be welded firmly. other
Metal exposed to the air should be protected by plating. Generally, electroplating should be used.
4.3.2 Requirements for electrical components
a) The components listed in Table 1 should meet the requirements of 7.1.1.2 in GB/T 3783-2008;
b) All solid insulating parts except ceramic materials should have heat resistance, that is, after the parts are subjected to the heat resistance test, the indentation spans the largest dimension
The inch is not more than 2mm;
c) All solid insulating parts except ceramic materials should have flame resistance, that is, the parts will not
Ignition, or even if ignition occurs, the combustion and heat can be completely extinguished within 30s after the glow wire (or needle flame) is removed, and the indication
Silk paper does not burn. At the same time, all plastic parts should also have flame retardancy, that is, after flame retardance test, these parts burn or damage
The length of the part is not more than 60mm;
d) All components should be installed in accordance with the manufacturer's instructions and meet the requirements of their respective standards.
4.3.3 Electrical connection requirements
a) The correctness of each electrical connection should be ensured. Auxiliary devices such as capacitors, fast fuses, electronic components, etc. should be screened before assembly,
Test and confirm that it has normal functions. The cross-sectional area of the cable and the crimping of the cable head should meet the maximum current carrying capacity of the converter. cloth
The line should be in accordance with 6.7 of GB/T 3797-2016;
b) All exposed conductors, connectors, terminal blocks, soldering points and circuit boards should be treated with anti-corrosion and moisture-proof treatment;
c) The conductive part should be made of copper or copper alloy;
d) When non-aluminum electrical accessories are connected to aluminum parts, appropriate measures should be taken to prevent electrolytic corrosion;
e) The wiring process and electrical connection in the cabinet should consider the influence of external insulation corrosion and condensation on the creepage distance, and the high humidity on the air insulation
The influence of fate;
f) Magnetic materials should not be used for shielding when multi-core cables are used in the AC system;
g) When single-core cables need to be connected in parallel, the type, length, and end technology of the parallel cables must be the same;
h) Permanent anti-corrosion non-magnetic clamps and brackets should be used for fixed cables;
i) Shielded cables or cables in metal pipes, shielded nets or metal pipes should be equipotentially connected.
4.3.4 Measures to prevent electric shock
The protective ground terminal shall have appropriate anti-corrosion measures, and the rest shall be in accordance with the provisions of 5.12 in JB/T 5777.2-2002.
4.3.5 Insulation performance
4.3.5.1 Insulation resistance
Under the normal test atmospheric conditions specified in 4.2.2, between each independent circuit of the converter and the exposed conductive part, as well as with each independent
Between the circuits, use a DC megohmmeter to measure the insulation resistance, which should not be less than 1 MΩ.
4.3.5.2 Dielectric strength
Under the normal test atmospheric conditions specified in 4.2.2, the converter should be able to withstand a power frequency withstand voltage test with a frequency of 50 Hz and a duration of 1 min.
No breakdown flashover and component damage.
4.3.5.3 Electrical clearance and creepage distance
The electrical clearance and creepage distance between the live circuits of the converter and between the live parts, conductive parts, and grounding parts should comply with Table 2.
Requirements.
4.3.6 Load control function
Within the allowable generator speed range and specified load level, the converter should be able to normally control the grid-connected operation and phase of the wind turbine.
Response power output.
4.3.7 Overload capacity
The overload capacity of the converter, including the motor side and the grid side, should match the overload capacity of the doubly-fed generator. In the converter rated operation bar
Under 110% of the nominal current, the continuous running time should be no less than 1 min.
4.3.8 Protection function
The converter should have at least the following protection functions.
a) Overcurrent protection;
b) Lack of phase protection;
c) Phase sequence error protection;
d) Protection of grid voltage imbalance;
e) Ground fault protection;
f) Cooling system failure protection;
g) Over temperature protection;
h) Generator under/over speed protection;
i) Over/under voltage protection;
j) Communication failure alarm;
k) Over/under frequency protection;
l) Power grid power failure protection;
m) Grid current imbalance protection;
n) Power device hardware protection;
o) Surge over-voltage protection;
p) Lightning protection.
The lightning protection of the converter shall meet the requirements of GB/T 21714.4.The converter should be installed with a lightning electromagnetic pulse protection system (LEMS)
In the area of wind power equipment, one of the following two situations is met.
--It is recommended to use a surge protector (SPD) external to the converter to suppress the impact of induced lightning. Load the variable flow of SPD device
The minimum withstand the nominal discharge current In is 20kA (waveform 8/20μs);
--The converter itself can withstand the minimum nominal discharge current In of 20kA (waveform 8/20μs).
In addition, the protection shutdown should be able to be released by remote or local self-reset after the protection conditions are released.
4.3.9 Temperature rise
Under the operating conditions of nominal current, after the thermal stability of each element, the limit temperature rise of each part of the converter is shown in Table 3.
4.3.10 Grid-connected cut-in current
The grid-connected cut-in current of the generator should not exceed the peak value of the stator rated current.
4.3.11 Communication requirements
The converter should have a corresponding communication interface and be able to communicate with the main control system of the unit. The communication protocol can be CDT, Modbus,
CANopen or PROFIBUS etc.
4.3.12 Power factor
Including the grid side of the converter and the output end of the unit, the converter should have a certain power factor adjustment capability, and the grid side of the converter should have
Certain power factor adjustment capability, the power factor can be adjusted between ±0.95.
4.3.13 Common mode voltage requirements
The filter link or filter of the converter should be designed to match the common mode voltage tolerance level at the motor end.
4.3.14 Differential mode voltage requirements
The filter link or filter of the converter should be designed to match the differential mode voltage tolerance level at the motor end.
4.3.15 du/dt requirements
The converter should be designed with filtering links or filters to match the tolerance level of the motor end to du/dt.
4.3.16 Efficiency
Under rated operating conditions, the converter efficiency should not be less than 97%.
4.3.17 Redundancy
The converter shall have redundant functions. It is advisable to use redundant components. power supply, converter control unit.
The converter should have strong fault-tolerant operation capability, and redundancy should be adopted to reduce the impact of a single fault on the entire system.
4.3.18 Stability running time
The continuous operation time of the converter at full load shall not be less than 72 h.
4.3.19 EMC performance
4.3.19.1 Electrostatic discharge immunity
The converter should be able to withstand the rigorous electrostatic discharge immunity test specified in Chapter 5 of GB/T 12668.3-2012.
4.3.19.2 Electrical fast transient pulse group immunity
The converter shall be able to withstand the severe electrical fast transient pulse group immunity test specified in Chapter 5 of GB/T 12668.3-2012.
4.3.20 Total harmonic distortion (THD)
It shall meet the requirements of 7.4 on harmonics in GB/T 20320-2013.
4.3.21 Grid adaptability
It should meet the requirements of GB/T.19963, and negotiate with the manufacturer if it exceeds this condition.
4.3.22 Fault ride-through capability
When a low/high voltage fault occurs, the converter should be coordinated with the main control system of the unit within the specified voltage amplitude and duration.
To ensure that the unit does not run off the grid, it should meet the requirements of NB/T 31051 and NB/T 31111.
4.3.23 Low temperature performance
The converter should have low temperature resistance, and the normal continuous operation is not less than 2h when the test environment is the lo...
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