Standard Briefing:Stadard ID: NB/T 31042-2019
Stadard Title: (Technical specification for offshore permanent magnet wind turbine converter)
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(Technical specification for offshore permanent magnet wind turbine converter)
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Basic Data: | Standard ID | NB/T 31042-2019 (NB/T31042-2019) | | Description (Translated English) | (Technical specification for offshore permanent magnet wind turbine converter) | | Sector / Industry | Energy Industry Standard (Recommended) | | Word Count Estimation | 27,286 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | NB/T 31042-2012 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | Contents, Scope, and Excerpt:NB/T 31042-2019
Technical Specification for converter of offshore permanent magnet wind turbine generator
NB
ICS 29.120.01
K 46
Energy Industry Standards of the People's Republic of China
Replace DL/T 31042-2012
Technical specification for offshore permanent magnet 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...2
5 Test method...8
6 Inspection Rules...15
7 Marking, packaging, storage and transportation...16
ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces NB/T -31042-2012 "Offshore Permanent Magnet Wind Turbine Converter". Compared with NB/T 31042-2012, this standard mainly
The changes are as follows.
--Modified the standard name, the original "Offshore Permanent Magnet Wind Turbine Converter" was renamed "Offshore Permanent Magnet Wind Turbine Converter Technology"
specification";
--- Added the power factor, differential mode voltage, du/dt value of the grid side in Chapter 3 "Terms and Definitions";
--- Added the relevant regulations on common mode voltage, differential mode voltage and du/dt value in the technical requirements in Chapter 4;
--Modified 4.1.1 the lower limit of ambient temperature for normal temperature and low temperature converter models, -10℃ for normal temperature and -20℃ for low temperature;
--Modified 4.1.2 experimental environmental conditions temperature range. -5 ℃～40℃; relative humidity conditions ≤90% (20℃);
---Modified 4.2.1 product types were subdivided, classified according to ambient temperature and power module cooling mode;
--Modified the grid side voltage KV in 4.2.2 product parameters. 0.38 (0.4), 0.6 (0.62), 0.66 (0.69), 1 (1.05),
1.14 (1.2), 2.3 (2.4), 3 (3.15), 6 (6.3), delete the rated capacity of the supporting unit;
- Modified the description of related content in 4.3.5 insulation requirements, and refined the contents of the test voltage selection table;
--Added 4.3.7 power factor adjustment index of the converter grid side ±0.95;
--Modified 4.3.11 grid adaptability, deleted low voltage ride through related content, and changed the reference standard to GB/T.19963;
---Add 4.3.22 fault ride-through capability requirements, covering high/low voltage ride-through capability, reference standards NB/T 31051-2014, NB/T
31111-2017;
--Modified 4.3.12 that the converter efficiency should not be less than 97%;
--- Increase the limit temperature rise requirements of copper-aluminum composite busbar in 4.3.13 temperature rise test;
--- Added the protection of grid power failure and grid current imbalance in 4.3.15 protection function, and the nominal discharge current of lightning protection is modified to
20KA;
--- Added 4.3.18 and 4.3.19 high and low temperature performance, the upper and lower limit temperature continuous operation time is 2h;
--- Added 4.3.20 Alternating damp heat resistance performance. After damp heat test, the insulation resistance should not be less than 0.5 MW, and the dielectric strength should not be less than
75% of the voltage value of the quality strength test.
--- Added the provisions of A sound level in 4.3.24 noise requirements;
--- Added two protocols, CDT and Modbus in 4.3.25 communication requirements;
--- The relevant reference standard for 5.3.7 insulation requirements is revised to GB/T 3859.1-2013;
--- Added the test methods for power outage protection and unbalanced power grid current protection in 5.3.10 protection function test;
- Modified 5.3.10.15 lightning protection test times to 10 times, and the test current is 20KA;
- Revised the reference standard of 5.2.23 grid adaptability test method to NB/T 31054-2014;
- Added 5.3.15 common mode voltage, 5.3.16 differential mode voltage, 5.3.17du/dt value, 5.3.24 fault ride-through capability, 5.3.33 storage
And other test methods.
--- Added the requirements for waterproof, moisture-proof, rust-proof, mildew-proof, shock-proof, bump-proof and abrasion-proof in 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. Shanghai Electric Power Transmission and Distribution Group Co., Ltd., Beijing Institute of Electrical Technology and Economics, Beijing Jin
Wind Technology Electrical Equipment Co., Ltd., Shanghai Electric Wind Power Group Co., Ltd., Mingyang Smart Energy Group Co., Ltd., China Classification Society
Certification company, Zhejiang Haide New Energy Co., Ltd., Tianjin Ruineng Electric Co., Ltd., Xuchang Cape Testing and Research Institute Co., Ltd., Tian
Jintian Transmission Electric Control Equipment Inspection 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, Zhejiang Yunda Wind Power Co., Ltd.,
Beijing Tiancheng Tongchuang Electric Co., Ltd., Suzhou Electric Scientific 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. Sun Jinying, Guo Yan, Li Ning, Hou Kun, Yang Caijian, Wang Ruiming, Zhang Li, Yuan Guofeng, Jing Yanan, Guo Liang, Zhang
Xinqiang, Lin Zhouquan, Yu Qing, Li Erhai, Wang Jianquan, Wang Peng, Wang Yanhua, Zhang Min, Zhao Yu, Zhou Dangsheng, Zhou Xinliang.
The previous editions of the standard replaced by this standard are as follows.
Technical specification for offshore permanent magnet wind turbine converter
ScopeThis standard specifies the terms and definitions, technical requirements, and test methods for offshore permanent magnet wind turbine converters (hereinafter referred to as "converters")
Law, inspection rules, etc.
This standard applies to voltage source type converters installed in offshore wind farms connected to the stator windings of permanent magnet wind turbines. Squirrel cage type wind turbine,
Electrically excited wind turbines and converters for medium/high-speed offshore permanent magnet wind turbines can be implemented with reference to this standard.
Normative ReferencesThe 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 Marine low-voltage electrical basic requirements
GB/T 3797-2016 Electrical control equipment
GB/T 3859.1-2013 General requirements for semiconductor converters and power grid commutated converters Part 1-1.Basic requirements specification
GB/T 4208 Enclosure protection grade (IP code). General
GB/T 4768-2008 Anti-mold packaging
GB/T 4879-2016 Anti-rust packaging
GB/T 5048-2017 moisture-proof packaging
GB/T 5169.5-2016 Fire hazard test of electrical and electronic products Part 5.Test flame needle flame test method device, confirmation test method
Laws and guidelines
GB/T 5169.11-2017 Fire hazard test for electrical and electronic products Part 11.Glow wire/hot wire basic test method The glow of the finished product
Silk flammability test method
GB/T 5169.21-2017 Fire hazard test of electrical and electronic products Part 21.Abnormal hot ball pressure test
GB/T 7094-2016 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
GB/T 12668.3-2012 Adjustable speed electric drive system Part 3.Electromagnetic compatibility standards of products and specific test methods
GB/T 13384-2008 General technical conditions for packaging of mechanical and electrical products
GB/T 13422-2013 Electrical test methods for semiconductor power converters
GB 14048.1-2012 Low-voltage switchgear and control equipment Part 1.General
GB/T 15543-2008 Three-phase voltage unbalance
GB 18451.1 Wind Turbine Generator Design Requirements
GB/T.19963 Technical Regulations for Connecting Wind Farms to Power Systems
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 20320-2013 Wind turbine power quality measurement and evaluation method
JB/T 5777.2-2002 General technical requirements for control and relay protection screens (cabinet, platform) for secondary circuits in power systems
NB/T 31015-2018 Permanent Magnet Wind Turbine Converter Technical Specification
NB/T 31051-2014 Wind Turbine Generator Low Voltage Ride Through Ability Test Regulation
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 31111-2017 Wind Turbine Generator High Voltage Ride Through Test Regulation
Terms and DefinitionsGB/T 3859.1-2013, GB/T 2900.33, GB/T 2900.53, GB/T.19963 and NB/T 31015-2018 and the following
The listed 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 low temperature type and normal temperature type;
b) According to the cooling mode of the power module, it is divided into air-cooled, liquid-cooled, mixed-cooled, etc., and liquid-cooled should be adopted.
4.1.2 Grid side voltage level (kV)
The grid side voltage level of the converter preferentially adopts the following series.
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%;
c) Altitude. ≤1000 m;
d) Influence of salt spray. Yes
e) Mold 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. ≤ 90% (below 20°C);
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 GB/T 15543-2008, the asymmetry degree of the grid voltage 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
The 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 and
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.
According to 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.
There is 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 permanent magnet 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 overspeed protection;
i) Over/under voltage protection;
j) Communication failure alarm;
k) Surge over-voltage protection;
l) Power grid power failure protection;
m) Grid current imbalance protection;
n) 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, and meet one of the following two situations.
--It is recommended to use a surge protector (SPD) external to the converter to suppress the impact of induced lightning. Loaded with SPD device
The minimum converter can withstand 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 converter should not exceed the peak value of the rated current on the grid side of the converter.
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, 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 converter should be designed with filtering links or filters to match the common mode voltage tolerance level at the motor end.
4.3.14 Differential mode voltage requirements
The converter should be designed with filtering links or filters to match the differential mode voltage tolerance level at the motor end.
4.3.15 du/dt value requirements
The converter should be designed with filtering links or filters to match the tolerance level of the motor end to the du/dt value.
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
Meet the relevant requirements of GB/T.19963, if the conditions are exceeded, the manufacturer should be negotiated.
4.3.22 Fault ride-through capability
When a low/high voltage fault occurs at the grid connection point of a wind turbine, the converter shall be in the main control of the unit within the specified voltage amplitude and duration.
With the cooperation of the control system, it can ensure that the unit does not run off the grid and meet the relevant requirements of NB/T 31051-2014 and NB/T 31111-2017.
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 lower limit of the working temperature.
Note. The running time from power-on to start-up is generally not more than 2h.
4.3.24 High temperature performance
The converter should have high temperature resistance, and the normal continuous operation shall not be less than 2h when the test environment is the upper limit temperature of the working temperature.
Note. The running time from power-on to start-up is generally not more than 2h.
4.3.25 Humidity and heat resistance
The converter should ......
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