GB/T 32077-2025 Wind energy generation systems - Pitch system of wind turbines
1 Scope
This document specifies the working conditions, technical requirements, test methods, inspection rules, delivery requirements, installation and maintenance of the pitch system of grid-connected wind turbines (hereafter referred to as pitch system).
This document applies to the pitch system of grid-connected horizontal axis wind turbines, and the pitch drive is hydraulic or electric.
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 1029 Test procedures for three-phase synchronous machines
GB/T 1032 Test methods for three-phase asynchronous motors
GB/T 1311 Test methods for direct current machines
GB/T 2422 Environmental testing - Guide to drafting of test methods - Terms and definitions
GB/T 2423.1-2008 Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 2423.2-2008 Environmental testing for electric and electronic products - Part 2 : Test methods - Tests B : Dry heat
GB/T 2423.3-2016 Environmental testing - Part 2 : Testing method - Test Cab : Damp heat, steady state
GB/T 2423.4-2008 Environmental testing for electric and electronic products - Part 2: Test method - Test Db: Damp heat, cyclic (12h+12h cycle)
GB/T 2900.1 Electrotechnical terminology - Fundamental terms
GB/T 2900.53 Electrotechnical terminology - Wind turbine generator systems
GB/T 3222.2 Acoustics - Description, measurement and assessment of environmental noise - Part 2 : Determination of sound pressure levels
GB/T 3480 (all parts) Calculation of load capacity of spur and helical gears
GB/T 3482-2008 Lightning test method for electronic equipments
GB/T 3766 Hydraulic fluid power - General rules and safety requirements for systems and their components
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 4365 Electrotechnical terminology - Electromagnetic compatibility
GB/T 5226.1 Electrical safety of machinery - Electrical equipment of machines - Part 1 : General requirements
GB/T 6388 Transport package shipping mark
GB/T 7251.1-2023 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
GB/T 7935 Hydraulic fluid power - General requirements for hydraulic components
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 11287-2000 Electrical relays - Part 21 : Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section one : Vibration tests (sinusoidal)
GB/T 12113 Methods of measurement of touch current and protective conductor current
GB/T 13729-2019 Remote terminal unit equipment
GB/T 14039 Hydraulic fluid power - Fluids--Method for coding the level of contamination by solid particles
GB/T 14537-1993 Shock and bump tests on measuring relays and protection equipment
GB/T 14598.27-2017 Measuring relays and protection equipment - Part 27 : Product safety requirements
GB/T 15543-2008 Power quality - Three-phase voltage unbalance
GB/T 16935.1-2023 Insulation coordination for equipment within low-voltage supply systems - Part 1 : Principles, requirements and tests
GB/T 17626.2-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2023 Electromagnetic compatibility - Testing and measurement techniques - Part 3 : Radiated, radio-frequency, electromagnetic field immunity test
GB/T 17626.4-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient / burstimmunity test
GB/T 17626.5-2019 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test
GB/T 17626.6-2017 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields
GB/T 18451.1-2022 Wind energy generation systems - Design requirements
GB/T 19292.1-2018 Corrosion of metals and alloys - Corrosivity of atmospheres - Part 1 : Classification, determination and estimation
GB/T 19568 Wind turbines - Assembling and installation regulation
GB/T 19608.1 Classification of special environmental condition - Part 1 : Dry heat
GB/T 19608.2 Classification of special environmental condition - Part 2 : Dry heat-desert
GB/T 19608.3 Classification of special environmental condition - Part 3 : Plateau
GB/T 19963.1-2021 Technical specification for connecting wind farm to power system -Part 1 : On shore wind power
GB/T 20641 Empty enclosures for low-voltage switchgear and controlgear assemblies -General requirements
GB/T 20663-2017 Accumulators
GB/T 21714.4 Protection against lightning - Part 4 : Electrical and electronic systems within structures
GB/T 22473.1-2021 Batteries used for energy storage - Part 1 : Photovoltaic off-grid application technical conditions
GB/T 29717-2013 Rolling bearings - Wind power generators yaw and pitch bearings
GB/T 30790.5 Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 5: Protective paint systems
GB/T 30790.6-2014 Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 6: Laboratory performance test methods
GB/T 33629-2024 Wind energy generation systems - Lightning protection
JB/T 5558 Test method of reduction (increase) gear unites
JB/T 5777.2-2002 General specification for control and protection panel (cabinet, desk)of secondary circuit of power system
JB/T 5777.3-2002 Basic testing method for control and protection panel (cabinet, desk) of secondary circuit of power system
JB/T 10427 General hydraulic system of wind turbine generator systems
NB/T 10567 Code of pitch system maintenance for wind turbine generator system
NB/T 10924-2022 Technical specification for pitch motor used in wind turbine generator system
NB/T 31126-2017 Technical specification for pitch converter of wind turbine
NB/T 31149-2018 Specification for ultracapacitors used in pitch system of wind turbine generator system
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2422, GB/T 2900.1, GB/T 2900.53 and GB/T 4365 as well as the following apply.
3.1
pitch system
equipment controlling and adjusting the blade pitch angle of wind turbines
Note: It mainly includes pitch control device, pitch drive device, backup power source, pitch actuator, pitch lubrication device and pitch detection device.
3.2
electricpitch system
equipment adjusting the blade pitch angle by driving the pitch gearbox with a pitch motor
Note: It mainly includes pitch controller, pitch servo driver or frequency converter, backup power supply, pitch motor, pitch gearbox, pitch bearing, pitch lubrication system, pitch detector and other components.
3.3
hydraulicpitch system
equipment adjusting the blade pitch angle by driving the linkage mechanism with hydraulic cylinder (or other hydraulic actuator)
Note: It mainly includes pitch controller, hydraulic station, valve manifold, accumulator, hydraulic cylinder, linkage mechanism, pitch bearing, pitch lubrication system, pitch detector and other components.
3.4
multi-driver pitch system
equipment adjusting the pitch angle of a blade by using two or more pitch drive equipment
3.5
pitch drive equipment
equipment driving the pitch actuator to act
Note: The pitch drive equipment in the electricpitch system includes pitch servo driver (or frequency converter) and motor; the pitch drive equipment in multi-driver pitch system includes hydraulic station and valve manifold.
3.6
pitch actuating equipment
equipment driving the blades of wind turbine to rotate to adjust the pitch angle of the blades
Note: In the electricpitch system, pitch actuating equipment includes pitch control gear box and pitch control bearing; in hydraulicpitch system, the pitch control actuator includes hydraulic cylinder (or other hydraulic actuators), linkage mechanism and pitch control bearing.
3.7
the maximum pitch rate
maximum allowable pitch angle change rate
3.8
feathering
change of the geometric angle of attack of the wind turbine blade to the state that the wind turbine blade approaches zero lift
3.9
fine
change of the geometric angle of attack of the wind turbine blade to the state that the wind turbine blade approaches the maximum lift
3.10
safety position
pitch angle position that the wind turbine can ensure safety of the whole turbine
3.11
pitch system target position error
difference between the actual position and the target position of the blade pitch angle sensor after pitch action by the pitch control actuator upon receiving pitch instructions from wind turbine control system
3.12
pitch system following error
difference between the actual position and the target position of the blade pitch angle sensor at a moment after the pitch system reaching a stable speed upon receiving continuous pitch control instructions from wind turbine control system
