GB/T 23479-2023 English PDF (GB/T23479-2023)

GB/T 23479-2023: Wind turbine - Doubly-fed induction generator
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GB/T 23479-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.180
CCS F 11
Replacing GB/T 23479.1-2009, GB/T 23479.2-2009
Wind Turbine - Doubly-fed Induction Generator
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 10
2 Normative References ... 10
3 Terms and Definitions ... 11
4 Symbols ... 12
5 Structural Type and Main Parameter Series ... 13
6 Technical Requirements ... 14
7 Test Methods ... 19
8 Inspection Rules ... 26
9 Warning Signs ... 28
10 Product Information ... 28
11 Packaging, Transportation and Storage ... 29
12 Environmental Protection ... 30
13 Safety ... 30
Wind Turbine - Doubly-fed Induction Generator
1 Scope
This document specifies the type, technical requirements, test methods, inspection rules,
warning signs, product information, packaging, transportation and storage, environmental
protection and safety of low-voltage doubly-fed induction generator for grid-connected wind
turbines with a rated voltage of 1,140 V and below.
This document is applicable to low-voltage doubly-fed induction generator for grid-connected
wind turbines with a rated voltage of 1,140 V and below (hereinafter referred to as “the
generator”).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. 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 Marking for Handling of Goods
GB/T 755-2019 Rotating Electrical Machines - Rating and Performance
GB/T 997 Rotating Electrical Machines - Classification of Types of Construction, Mounting
Arrangements and Terminal Box Position for (IM Code)
GB/T 1029 Test Procedures for Three-phase Synchronous Machines
GB/T 1032-2012 Test Procedures for Three-phase Induction Motors
GB/T 1971 Rotating Electrical Machines - Terminal Markings and Direction of Rotation
GB/T 1993 Cooling Methods for Rotating Electrical Machines
GB/T 2900.25 Electrotechnical Terminology - Rotating Electrical Machines
GB/T 4942-2021 Degrees of Protection Provided by the Integral Design of Rotating Electrical
Machines (IP code) - Classification
GB/T 10068 Mechanical Vibration of Certain Machines with Shaft Heights 56 mm and Higher
- Measurement, Evaluation and Limits of Vibration Severity
GB/T 10069.1 Measurement of the Airborne Noise Emitted by Rotating Electrical Machines
and the Noise Limits - Part 1: Method for the Measurement of Airborne Noise Emitted by
Udc: DC bus voltage, V.
Ur: operating voltage of the rotor, V.
U0: no-load stator voltage, V.
Ur0: rotor locked open-circuit voltage, V.
: efficiency, %.
5 Structural Type and Main Parameter Series
5.1 Structural Type
5.1.1 The protection degree of the enclosure of the generator shall not be lower than IP54
specified in GB/T 4942-2021. Under special circumstances, it may be determined by the
generator manufacturer and the user through consultation. The protection degree of the junction
box shall not be lower than IP54 specified in GB/T 4942-2021, and a ground terminal shall be
provided in the junction box. The protection degree of the slip ring chamber of the generator
shall not be lower than IP23.
5.1.2 The cooling mode of the generator shall comply with the stipulations of GB/T 1993. The
cooling mode beyond the scope specified in the Standard shall be determined by the generator
manufacturer and the user through consultation. The primary or secondary cooling medium
shall not cause harm to the product or the surrounding environment. If liquid cooling is adopted,
there shall be no leakage and corrosion, etc.
5.1.3 The stator winding and rotor winding leading-out terminals and the connecting terminals
in the junction box shall all have corresponding signs, and it shall be ensured that their writing
is clearly visible throughout the generator’s period of use. The generator wire-end markings
and rotation directions shall comply with the stipulations of GB/T 1971, or be determined by
the generator manufacturer and the user through consultation.
5.1.4 The structure and installation type of the generator shall comply with the stipulations of
GB/T 997. The structure and installation type beyond the scope specified in the Standard shall
be determined by the generator manufacturer and the user through consultation.
5.1.5 An electric heating device shall be installed inside the generator. The power selection of
the electric heating device is based on JB/T 7836.1.
5.1.6 The generator shall be equipped with a stator winding temperature sensor, bearing
temperature sensor and carbon brush wear sensor to monitor the operating status of the
generator. If other types of sensors need to be added, this shall be determined by the generator
manufacturer and the user through consultation.
5.1.7 An oil filling structure shall be set up for the lubrication of the generator bearings, and the
filling mode shall be determined by the generator manufacturer and the user through
c) The maximum water temperature at the inlet of the water-cooling cooler or the
maximum ambient water temperature of the water jacket-cooling motor does not
exceed 40 C;
d) Relative air humidity: the monthly average maximum relative humidity in the wettest
month is 90% (the monthly average minimum temperature in that month is not higher
than 25 C).
6.1.2 Electrical operating conditions
6.1.2.1 The generator shall be able to normally operate under the following electrical conditions:
a) Under the grid conditions of rated voltage tolerance and rated frequency tolerance
specified in GB/T 19963.1, the generator shall be able to normally operate;
b) For motors with Type II insulation structure in accordance with GB/T 22720.2 and
designed to be powered by voltage source converters, the manufacturer shall mark the
pulse peak coefficient (OF) of the insulation structure in accordance with GB/T
22720.1; the phase-to-phase should satisfy the pulse voltage level (Up/Ua) C, and the
phase-to-ground should satisfy level (Up/Ua) B, or the level agreed between the
manufacturer and the user.
NOTE: when a generator needs to operate beyond one or more of the above-mentioned limit
conditions, its special requirements can be determined by the generator manufacturer and
the user through consultation.
6.1.2.2 The generator shall be able to withstand the unit requirements specified in GB/T 19963.1,
and continuously operate without disconnecting from the grid.
6.2 Basic Performance
6.2.1 The generator shall be manufactured in accordance with the drawings and technical
documents approved by the prescribed procedures.
6.2.2 The appearance and installation dimensions of the generator shall comply with the
requirements of the outline drawings agreed with the user.
6.2.3 When the generator is idling, it shall be smooth, flexible and without stagnation.
6.3 Temperature and Temperature Rise Limit
6.3.1 During the temperature rise test of the generator, the temperature detection of the stator
winding shall adopt the embedded thermometer method (ETD) and the resistance method (R),
and the temperature detection of the rotor winding shall adopt the resistance method (R). For
the temperature rise limit, see GB/T 755-2019. Under non-benchmark operating conditions
beyond what is specified in this document, the temperature rise limit shall be corrected in
accordance with the stipulations of GB/T 755-2019. When the altitude exceeds the requirements
of this document, it shall be corrected in accordance with the requirements of GB/T 31140.
6.3.2 The temperature rise or temperature of the collector ring, electric brush or brush device
shall not affect its normal operation.
6.3.3 When measured using the embedded thermometer method (ETD), the operating
temperature of the rolling bearings shall not be higher than 95 C.
6.4 Characteristics
6.4.1 System information exchange
The designers of the generator and the converter shall provide each other with relevant
information as follows:
---The generator designer shall provide the converter designer with the rated parameters
and equivalent circuit parameters of the generator;
---The converter designer shall provide the generator designer with the maximum voltage,
maximum current, voltage harmonics, switching frequency, DC bus voltage, phase-to-
ground peak voltage at the motor end, phase-to-phase peak-to-peak voltage, sudden
changes of voltage expected to appear at the motor end, and impulse rise times of the
converter, etc.
This information is necessary to ensure that the generator complies with the user’s requirements
and comprehensively evaluate the interaction effect between the generator and the converter.
6.4.2 Reference temperature
When the generator adopts Class F insulation, all its characteristics are plotted when the
winding reference temperature is 115 C.
When the generator adopts Class H insulation, all its characteristics are plotted when the
winding reference temperature is 135 C. This temperature shall be indicated on the
characteristic curve.
6.4.3 Generator characteristics
The specified characteristics of the generator refer to the relation curve among the total active
power of the generator (Pe), the active power of the stator (Ps), the active power of the rotor
(Pr), the reactive power of the rotor (Qr), the stator current (Is), the operating voltage of the rotor
(Ur), the rotor current (Ir), as well as the efficiency () and rotation speed (n) when the motor
rotor winding is power by the converter, and maintains the rated voltage, rated frequency and
rated power factor. The characteristic curve shall be measured within the entire operating speed
range (nmin ~ nmax) when the generator is in a thermal state and after the temperature rise test of
the generator.
6.5 Tolerances
6.5.1 No-load current tolerance
alternating current for a duration of 1 minute, and there shall be no breakdown or flashover.
The test shall be immediately carried out after the exit-factory test is completed. The effective
value of the stator test voltage is 2UN + 1,000 V, with a minimum of 1,500 V; the effective value
of the rotor test voltage is 2Udc + 1,000 V.
6.10.2 Interturn withstand voltage
6.10.2.1 The random-wound winding shall be able to withstand the interturn insulation impulse
voltage test without breakdown for 3 seconds. The peak value of the impulse test voltage shall
comply with the stipulations of GB/T 22719.2.
6.10.2.2 The form-wound winding shall be able to withstand the interturn insulation impulse
voltage test without breakdown for 3 seconds. The peak value of the impulse test voltage shall
comply with the stipulations of GB/T 22714.
6.11 Short-time Voltage Increase
The generator shall be able to withstand a short-time voltage increase test without manifesting
any fault. During the test, adjust the generator stator voltage to 1.3 times the rated voltage, and
the frequency shall not be lower than the power frequency for a duration of 3 minutes, and the
insulation shall not be damaged.
6.12 Harmonic Waves
6.12.1 Under the no-load operating status of the generator, and at the rated rotation speed, power
is supplied through the rotor sinusoidal voltage and rated slip frequency. The total harmonic
distortion (THD) of the stator line end voltage of the generator shall not exceed 5%, and the
frequency measurement range shall include all harmonic waves from the rated frequency to the
50th harmonic wave.
6.12.2 Under the rated operating conditions and power supplied by the converter (the waveform
distortion rate on the motor side is less than or equal to 3%), the harmonic current factor HCF
for the determination of the stator line end current of the generator shall not exceed 5%. The
frequency measurement range shall include all harmonic waves from the 2nd harmonic wave to
the 50th harmonic wave.
6.13 Noise
When the generator operates under the condition of short-circuited rotor winding and power
frequency no-load motor, the cooler normally works, measure the noise in the specified rotation
direction. The noise limits of the generator shall satisfy the stipulations of GB/T 10069.3.
6.14 Vibration
When the generator is installed on the test bench and operates under the condition of short-
circuited rotor winding and power frequency no-load motor, and the cooler normally works, the
limits of the vibration speed and displacement shall satisfy the stipulations of GB/T 10068.
6.15 Efficiency
The efficiency of the generator under the rated operating conditions shall be greater than or
equal to 96%.
6.16 Other Requirements
6.16.1 The generator shall be insulated with insulated bearings or end covers, and the generator
shaft shall be equipped with a single-ended or double-ended grounding device, so as to reduce
the adverse impact of shaft current on the bearings.
6.16.2 The difference between the three-phase resistance value and the average value of the
three-phase resistance shall not be greater than 2% of the average value for star-connected
windings; and shall not be greater than 1.5% of the average value for delta-connected windings.
6.16.3 For grounding protection, refer to the requirements of 11.1 in GB/T 755-2019.
6.16.4 The anti-corrosion of the generator shall not be lower than the requirements of C3 in
GB/T 30790.5-2014.
7 Test Methods
7.1 Test Requirements
7.1.1 The power supply circuit shall comply with the requirements of 7.2.2 in GB/T 755-2019.
7.1.2 The converters used for the test shall comply with the requirements of GB/T 25388.1.
7.1.3 The measuring instruments used for the test shall comply with the requirements of 4.3 in
GB/T 1032-2012.
7.2 ...