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GB/T 25387.1-2021 English PDF (GBT25387.1-2021)

GB/T 25387.1-2021 English PDF (GBT25387.1-2021)

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GB/T 25387.1-2021: Wind turbines generator system -- Full-power converter -- Part 1: Technical condition

This Part of GB/T 25387 specifies the terms and definitions, general requirements, inspection rules and product-related information of full-power AC-DC-AC voltage-type converters for wind turbines generator system. This Part is applicable to the full-power AC-DC-AC voltage-type converters for wind turbines generator system (hereinafter referred to as ????the converters????).
GB/T 25387.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.180
F 11
Replacing GB/T 25387.1-2010
Wind Turbines Generator System - Full-power Converter -
Part 1: Technical Condition
ISSUED ON: MARCH 9, 2021
IMPLEMENTED ON: OCTOBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 General Requirements ... 12
4.1 Requirements for Conditions of Use ... 12
4.2 Cabinets and Components ... 14
4.3 Performance Indicators ... 15
4.4 Fault Protection ... 17
4.5 Safety Requirements ... 21
4.6 Electromagnetic Compatibility ... 23
4.7 Operation and Maintenance ... 24
4.8 Communication and Monitoring ... 25
4.9 Requirements for Grounding Safety ... 25
4.10 Requirements for Thermal Protection ... 26
4.11 Lightning Protection ... 27
4.12 Protective Performance ... 27
4.13 Requirements for Vibration Test ... 27
4.14 Requirements for High-temperature Test ... 27
4.15 Requirements for Low-temperature Test ... 27
4.16 Constant Damp Heat Test Requirements ... 28
4.17 Alternating Damp Heat Test Requirements ... 28
5 Test Methods ... 28
6 Inspection Rules ... 28
6.1 Type Test ... 28
6.2 Exit-factory Test ... 29
6.3 Test Items ... 29
7 Marking, Packaging, Storage and Transportation ... 30
7.1 Marking ... 30
7.2 Packaging ... 31
7.3 Storage ... 31
7.4 Transportation ... 32
Appendix A (informative) Topological Structures of Commonly Used Full-power AC- DC-AC Voltage-type Converter ... 33
Wind Turbines Generator System - Full-power Converter -
Part 1: Technical Condition
1 Scope
This Part of GB/T 25387 specifies the terms and definitions, general requirements, inspection rules and product-related information of full-power AC-DC-AC voltage-type converters for wind turbines generator system.
This Part is applicable to the full-power AC-DC-AC voltage-type converters for wind turbines generator system (hereinafter referred to as ?€?the converters?€?).
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 191 Packaging - Pictorial Markings for Handling of Goods
GB/T 2423.56 Environmental Testing - Part 2: Test Methods - Test Fh: Vibration, Broadband Random and Guidance
GB/T 2900.53 Electrotechnical Terminology - Wind Turbine Generator Systems GB/T 3797 Electrical Control Assemblies
GB/T 3859.1 Semiconductor Converters - General Requirements and Line Commutated Converters - Part 1-1: Specification of Basic Requirements
GB/T 3859.2-2013 Semiconductor Converters- General Requirements and Line Commutated Converters - Part 1-2: Application Guide
GB/T 4208-2017 Degrees of Protection Provided by Enclosure (IP code)
GB/T 4798.1 Classification of Environmental Conditions - Classification of Groups of Environmental Parameters and Their Severities - Part 1: Storage
GB/T 4798.2 Environmental Conditions Existing in the Application of Electric and Electronic Products - Part 2: Transportation
GB/T 4798.3 Environmental Conditions Existing in the Application of Electric and Electronic Products - Part 3: Stationary Use at Weather-protected Locations
A conversion unit that converts the AC electricity of the voltage, current amplitude and frequency change output by the wind turbines into DC electricity.
3.2 grid-side converter
A conversion unit that converts the DC electricity output by the generator-side converter into AC electricity that satisfies the requirements of the power grid, and feeds back to the power grid.
3.3 DC link
A DC unit connected to each other between the generator-side converter and the grid-side converter.
3.4 full-power converter
A conversion system composed of generator-side converter, grid-side converter and DC link, and undertakes all energy conversion of the adapted wind turbines.
NOTE: see Appendix A.
3.5 rated power of grid-side converter
The net on-grid rated active power of the adapted wind turbine of the grid-side converter. 3.6 rated power of generator-side converter
The rated active power of the adapted wind turbine of the generator-side converter. 3.7 grid-side power factor
The ratio of the active power output by the grid-side converter to the apparent power. 3.8 grid-side rated frequency
The nominal fundamental wave frequency of the grid voltage adapted to the grid-side converter. 3.9 grid-side frequency range
The gird voltage fundamental wave frequency variation interval that can be adapted to grid- side converter.
3.10 grid-side rated voltage
The root mean square value of the fundamental wave of the conductor line voltage between the low-voltage side of the boosting transformer adapted to the wind turbine and the grid-side converter.
3.11 grid-side operating voltage range
NOTE: when the voltage change in a short period of time exceeds the above-mentioned specified value, it may cause operation interruption or trip. If continuous operation is required, the user shall negotiate with the manufacturer.
4.1.2.4 Grid voltage unbalance
When the grid voltage unbalance is not greater than 4%, the converter shall be able to normally connect to the grid and operate; when the grid voltage unbalance is greater than 4% and less than 8%, the converter can maintain grid-connected operation.
4.1.2.5 Grid voltage fluctuations
When the difference in the extreme value of the grid voltage fluctuation range does not exceed 1.25% of the rated voltage within one hour, the converter shall be able to normally operate. 4.1.2.6 Total harmonic distortion (THDu) of voltage
The waveform of the grid voltage shall be a sine wave. Under steady-state conditions, when the total harmonic distortion of voltage is less than 5%, the converter shall be able to operate normally. Each order of harmonic of the grid voltage shall satisfy the requirements of GB/T 14549.
4.2 Cabinets and Components
4.2.1 Cabinet design requirements
The cabinet design shall satisfy the following requirements:
a) The construction standards for the converter cabinets shall comply with the relevant stipulations of GB/T 20641;
b) The design of the converter cabinets shall satisfy the installation and maintenance requirements of the tower and the cabin. When needed, there shall be corresponding vibration reduction measures;
c) The design of the converter cabinets shall satisfy the requirements of safe grounding; d) There shall be no scratching or deformation of the converter enclosure, appearance and surface, and shall comply with the stipulations of GB/T 3797.
4.2.2 Component requirements
The components shall satisfy the following requirements:
a) The components used in the converter shall comply with their own relevant standards and the relevant stipulations of GB/T 5226.1;
b) Anti-corrosion measures shall be taken into consideration for the metal parts of the product. All parts shall be intact, and the appearance of the product shall be free of scratches, damages and deformations;
c) Product parts and components shall be correctly and firmly installed, and achieve reliable mechanical and electrical connections;
d) The operation and adjustment parts, such as: rotary knobs, control switches, conversion switches and buttons shall be flexibly operated, and there must be no phenomenon such as stuck, loosening and poor contact, etc. There must be no phenomenon of loosening or state changes after vibration.
4.2.3 Electrical connection requirements
4.2.3.1 The correctness of each electrical connection shall be ensured. Auxiliary devices, such as: relays, contactors, micro circuit breakers and electronic components, shall be confirmed to be qualified before the assembly.
4.2.3.2 The laying and connection of cables and wires shall comply with the stipulations of GB/T 5226.1.
4.3 Performance Indicators
4.3.1 Converter efficiency
Under the operating conditions of the grid-side rated voltage, grid-side rated frequency, grid- side rated power and grid-side unity power factor, the converter efficiency shall not be lower than 97%.
4.3.2 Grid-side power factor
The converter shall be equipped with the control function that enables the grid-side power factor to be adjustable between the capacitive 0.95 and the inductive 0.95.
NOTE: if there are special requirements, the range of the grid-side power factor may be determined by the user and the supplier / manufacturer through negotiation.
4.3.3 Harmonic distortion of each order
Under the operating conditions of the grid-side rated voltage, grid-side rated frequency, grid- side rated power and grid-side unity power factor, the harmonic current and harmonic voltage of each order of the output current of the wind turbines shall satisfy the requirements of GB/T 14549.
4.3.4 DC current content
Under the operating conditions of the grid-side rated voltage, grid-side rated frequency, grid- side rated power and grid-side unity power factor, the DC current content fed to the grid by the converter shall not exceed 0.5% of the grid-side rated current.
When the generator operates at different speeds, the deviation between the active power and reactive power shall not be greater than 2.5% of the rated power.
4.3.12 Torque control accuracy
The converter executes a give torque, and the deviation between the feedback torque and the given torque shall not be greater than 2.5% of the rated torque.
4.3.13 Grid-side converter current unbalance
Under the operating conditions of grid-side rated voltage, grid-side rated frequency, grid-side rated power and grid-side unity power factor, the ratio of the root mean square value of the negative sequence fundamental component of the grid-side converter current to the positive sequence fundamental component shall not exceed 5%.
4.3.14 Loading and unloading time
Under the conditions of grid-connected operation, the loading and unloading response time shall satisfy the customer?€?s demands.
4.3.15 Mean time between failures (MTBF)
MTBF shall be not less than 18,000 h.
NOTE: if there are special requirements, the MTBF value can be determined by the user and manufacturer through negotiation.
4.3.16 Stable operation time
Under the operating conditions of grid-side rated voltage, grid-side rated frequency, grid-side rated power and grid-side unity power factor, the continuous operation time of the converter shall not be less than 72 h.
4.3.17 Noise
Under the operating conditions of grid-side rated voltage, grid-side rated frequency, grid-side rated power and grid-side unity power factor, the noise of the converter shall not exceed 80 dB. 4.4 Fault Protection
4.4.1 Fault types
When an abnormal situation occurs and the limit value of the converter is exceeded, the full- power converter has the function of triggering fault protection, so as to protect the safety of the unit and the converter. The converter?€?s fault protection function includes the following two types:
a) Type I fault protection: for Type I fault, after this type of fault occurs, the converter triggers protection and executes an emergency shutdown strategy. The converter uploads the flag of Type I fault to the master control, and meanwhile, directly shuts down the load;
b) Type II fault protection: for Type II fault, after this type of fault occurs, the converter uploads a fault shutdown request to the master control, and the master control issues a slow shutdown command. If the master control does not issue the slow shutdown command within the time specified in the protocol, then, the converter shall execute its own slow shutdown strategy.
4.4.2 Protection function
4.4.2.1 Instantaneous overcurrent protection (Type I fault protection)
When the operating current exceeds the instantaneous overcurrent protection threshold, the converter shall be able to quickly activate protection and shutdown, including grid-side overcurrent protection and generator-side overcurrent protection.
4.4.2.2 Short-circuit protection (Type I fault protection)
When a short-circuit to ground or a multi-phase short-circuit fault occurs, the converter shall be able to quickly activate protection and shutdown, including grid-side short-circuit protection and generator-side short-circuit protection.
4.4.2.3 Lack-phase protection (Type I fault protection)
The converter shall be equipped with lack-phase protection. When a lack-phase occurs in the main circuit, the converter shall be able to quickly activate protection, including grid-side converter lack-phase protection and generator-side converter lack-phase protection. 4.4.2.4 Overvoltage protection (Type I fault protection)
When the operating voltage of the converter exceeds the maximum operating voltage allowed by the converter, the converter shall be able to activate protection and shutdown, including generator-side overvoltage protection, DC overvoltage protection and grid-side overvoltage protection (need to satisfy the corresponding high-voltage ride-through criteria). 4.4.2.5 Undervoltage protection (Type I fault protection)
When the operating voltage of the converter is lower than the minimum operating voltage of the converter, the converter shall be able to activate protection and shutdown, including generator-side undervoltage protection, DC undervoltage protection and grid-side undervoltage protection (need to satisfy the corresponding low-voltage ride-through criteria). 4.4.2.6 Phase-sequence error protection (Type I fault protection)
When the phase sequence of any two phases of the converter is wrong, including the grid-side voltage phase sequence and the generator-side voltage phase sequence, the converter shall be equipped with the functions of identification and protection.
When the grid voltage frequency is lower than the protection threshold of the converter, the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down. The protection threshold settings shall satisfy the requirements of 4.1.2.1.
4.4.2.15 Generator overspeed protection (Type II fault protection)
When the generator speed exceeds the protection threshold of the converter, the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down.
4.4.2.16 Communication fault protection (Type II fault protection)
The converter shall be equipped with communication fault protection with the master control system of the wind turbine. When a communication abnormality occurs, the converter will take relevant measures to notify the master control and shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down.
4.4.2.17 Cooling system fault protection (Type II fault protection)
The converter shall be equipped with cooling system fault protection, including cooling fan, water cooling system and other faults. When the cooling system is abnormally operating, the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down.
4.4.2.18 Overtemperature protection (Type II fault protection)
The converter shall be equipped with overtemperature protection. When the corresponding temperature of the converter exceeds the protection threshold, including overtemperature of environmental temperature, water temperature (water-cooling heat dissipation) and devices, etc., the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down. 4.4.2.19 UPS upstream stage power outage protection (Type II fault protection) When the AC input power supplied to the converter control circuit is powered off, the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down.
4.4.2.20 Surge overvoltage protection (Type II fault protection)
The converter shall be equipped with surge overvoltage protection, and a grid incoming line overvoltage absorption device shall be used as a standard configuration. When a surge overvoltage occurs, the converter shall trigger Type II fault protection. After the converter continuously operates for a set time, it will automatically reduce the load and shut down. NOTE: the division and definition of Type I faults and Type II faults shall be determined by the radio-frequency electromagnetic field radiation field intensity disturbance, and satisfy the performance criterion level A in Table 5.
4.6.1.4 Electrical fast transient burst immunity
The converter shall comply with the stipulations of GB/T 17626.4, be able to withstand the electrical fast transient burst disturbance of ??? 2 kV of the power line and ??? 1 kV of the signal, and satisfy the performance criterion level B in Table 5.
4.6.1.5 Surge (shock) immunity
The converter shall comply with the stipulations of GB/T 17626.5, be able to withstand the surge disturbance of ??? 2 kV of the common mode and ??? 1 kV of the differential mode, and satisfy the performance criterion level B in Table 5.
4.6.1.6 Conducted disturbance immunity induced by radio-frequency fields The converter shall comply with the stipulations of GB/T 17626.6, be able to withstand the electromagnetic conduction disturbance of radio frequency generators of test level 3 in the range of 150 kHz ~ 80 MHz, and satisfy the performance criterion level A in Table 5. 4.6.2 Electromagnetic emission
4.6.2.1 Conducted emission
The converters used in low-voltage power supply network facilities that are not directly connected to residences shall satisfy Class C3 limits in GB/T 12668.3-2012. 4.6.2.2 Radiated emission
The converters used in low-voltage power supply network facilities that are not directly connected to residences shall satisfy Class C3 limits in GB/T 12668.3-2012. 4.7 Operation and Maintenance
4.7.1 Operation life
The expected life of the converter within the specified conditions of use must be ??? 20 years. If the application is beyond the technical conditions of this Part, the expected life can be determined by the user and supplier / manufacturer through negotiation. 4.7.2 Maintenance requirements
The maintainability of each component shall be considered in the structural design of the converter. The maintenance and replacement of vulnerability parts of the converter shall be ??? 1 h, and the maintenance and replacement of electric reactors and transformers, etc., that weigh more than 100 kg shall be ??? 4 h. The converter manufacturer shall stipulate in the user manual the cycles, tools, methods and steps for the periodic inspection of each component. 4.8 Communication and Monitoring
4.8.1 Real-time communication
The converter shall be equipped with the function of real-time communication with the wind turbine control system an...

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