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GB/T 25388.1-2021 English PDF (GBT25388.1-2021)

GB/T 25388.1-2021 English PDF (GBT25388.1-2021)

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GB/T 25388.1-2021: Wind turbines generator system -- Double-fed converter -- Part 1: Technical condition
GB/T 25388.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.180
F 11
GB/T 25388.1-2021
Replacing GB/T 25388.1-2010
Wind turbines generator system - Double-fed converter -
Part 1: Technical condition
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 General requirements ... 13
4.1 Requirements for use conditions ... 13
4.2 Cabinets and components ... 15
4.3 Performance indicators ... 16
4.4 Fault protection ... 18
4.5 Security requirements ... 22
4.6 Electromagnetic compatibility ... 25
4.7 Operation and maintenance ... 27
4.8 Communication and monitoring ... 27
4.9 Protective performance ... 28
4.10 Requirements for vibration test ... 28
4.11 Requirements for high temperature test ... 28
4.12 Requirements for low temperature test ... 28
4.13 Requirements for constant damp heat test ... 28
5 Test methods ... 29
6 Inspection rules ... 29
6.1 Type test ... 29
6.2 Factory-exit test ... 29
7 Marking, packaging, storage, and transportation ... 31
7.1 Marking ... 31
7.2 Packaging ... 32
7.3 Storage ... 32
7.4 Transportation ... 33
Wind turbines generator system - Double-fed converter -
Part 1: Technical condition
1 Scope
This Part of GB/T 25388 specifies the relevant terms and definitions, general
requirements, calibration rules, and related product information of AC-DC-AC voltage
type converters for double-fed variable-speed constant-frequency wind turbines
generator systems (hereinafter referred to as “systems”).
This Part applies to AC-DC-AC voltage type converters for double-fed variable-speed
constant-frequency wind turbines generator systems, i.e., double-fed converters
(hereinafter referred to as “converters”).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking 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 Degrees of protection provide 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 Classification of environmental conditions - Classification of groups
of environmental parameters and their severities - Part 2: Transportation and
handling
factor of three-phase voltage unbalance
The degree of three-phase voltage unbalance in a three-phase power system. The root
mean square ratio of the negative sequence fundamental component to the positive
sequence fundamental component of the voltage, expressed as a percentage.
3.30
function of fault recorder
When a fault occurs in the converter, the converter has the function of automatically
storing the waveform at the fault time.
3.31
environmental temperature
When the converter is at a 60 mm horizontal surface, the average value of several points
equidistant between the sample and the test chamber wall, or the average value of
several points 1 m away from the sample, whichever is the smaller value.
3.32
mean time between failures
Under specified conditions and specified time, the average operating time between two
adjacent failures of the converter. It is calculated as formula (3):
where:
M - the MTBF time value, in hours (h);
T - the total effective operating time of the converter, in hours (h);
F - the total number of failures of the converter in this interval (events that cause the
system to shut down due to the converter are recorded as failures/events that cause
the system to shut down for maintenance due to the converter are recorded as
failures).
4 General requirements
4.1 Requirements for use conditions
4.1.1 Normal operating environment conditions
The grid voltage deviation at the common connection point on the low-voltage side of
the box-type transformer connected to the grid-side converter is within the range of -
10 % ~ +10 %, and the converter shall be able to operate continuously and normally.
4.1.2.3 Grid fault ride-through range
When the low-voltage side grid voltage of the step-up transformer connected to the
grid-side converter is within the range of 20 % ~ 90 % and 110 % ~ 130 % of the
nominal voltage, the converter shall be able to support voltage recovery by feeding
reactive current. The support time, the amplitude of the reactive current, and the
response time shall comply with the provisions of GB/T 36995.
NOTE: Voltage changes exceeding the above specified value in a short period of time may cause
work interruption or tripping. If continuous operation is required, it is agreed upon between the user
and supplier/manufacturer.
4.1.2.4 Grid voltage unbalance
When the grid voltage unbalance does not exceed 5 %, the converter shall be able to
operate normally on the grid. When the grid voltage unbalance is greater than 5 % and
less than 8 %, the converter can maintain on-grid operation.
4.1.2.5 Voltage total harmonic distortion rate, THDu
The waveform of the grid voltage shall be a sine wave. Under steady-state conditions,
the total harmonic distortion rate of the voltage is less than 5 %, and the converter shall
be able to operate normally. The harmonics of each order of the grid voltage shall meet
the requirements of GB/T 14549.
4.2 Cabinets and components
4.2.1 Cabinet design requirements
The design requirements of the converter cabinet are as follows:
a) The structure of the converter cabinet shall comply with the relevant provisions
of GB/T 20641;
b) The design of the converter cabinet shall meet the installation and maintenance
requirements in the tower and engine room; if necessary, corresponding vibration
reduction measures shall be taken;
c) The design of the converter cabinet shall meet the requirements for safety
grounding;
d) The converter enclosure, appearance, and surface shall be free of scratches and
deformations, and shall comply with the provisions of GB/T 3797.
4.2.2 Component requirements
The requirements for components used in the converter are as follows:
a) The components used in the converter shall comply with its own relevant
standards and the relevant provisions 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, damage, and deformation;
c) Product parts and components shall be installed correctly and firmly, and achieve
reliable mechanical and electrical connections;
d) The operation and adjustment parts of the cabinet, suc...
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