This standard specifies definition, measuring procedure and evaluation method of power quality characteristics of wind turbines generator systems, including:
——definition and specification of the quantities to be determined for characterizing the power quality of a grid connected wind turbine;
——measurement procedures for quantif ying the characteristics;
——procedures for assessing compliance with power quality requirements, including estimation of the power quality expected from the wind turbine type when deployed at a specific site, possibly in groups.
The measurement procedures are valid for single wind turbines with a three-phase grid connection. The measurement procedures are valid for any size of wind turbine, though this standard only requires wind turbine types intended for PCC (Point of Common Coupling) at MV or HV to be tested and characterized as specified in this standard.
The measured characteristics are valid for the specific configuration and operational mode of the assessed wind turbine type only. Other configurations, including altered control parameters that cause the wind turbine to behave differently with respect to power quality, require separate assessment.
The measurement procedures are designed to be as non-site-specific as possible, so that power quality characteristics measured at for example a test site can be considered valid also at other sites.
The procedures for assessing compliance with power quality requirements are valid for wind turbines with PCC at MV or HV in power systems with fixed frequency within ±1 Hz, and sufficient active and reactive power regulation capabilities. In other cases, the principles for assessing compliance with power quality requirements may still be used as a guidance.
This standard is for testing of wind turbines, though it contains information that may also be useful for testing of wind farms.
Note: This standard uses the following terms for system voltage:
——low voltage (LV) refers to Un≤1 kV;
——medium voltage (MV) refers to 1 kV
—— high voltage (HV) refers to Un>35 kV.
2 Normative References
The following documents for the application of this document are essential. For dated reference, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 17626.7—2008 Electromagnetic Compatibility (EMC) C Part 4-7: Testing and Measurement Techniques C General Guide on Harmonics and Interharmonics Measurements and Instrumentation, for Power Supply Systems and Equipment Connected Thereto (IEC 61000-4-7: 2002, IDT)
IEC 60044-1 Instrument Transformers—Part 1: Current trans-Formers
IEC 60044-2 Instrument Transformers—Part 2: Inductive Voltage Transformers)
IEC 60050-161 International Electrotechnical Vocabulary—Part 161: Electromagnetic Compatibility
IEC 60050-415 International Electrotechnical Vocabulary—Part 415: Wind Turbine Generator Systems
IEC 61000-4-15 Electromagnetic Compatibility (EMC)—Part 4: Testing and Measurement Techniques—Section 15: Flickermeter—Functional and Design Specifications
IEC 61400-12-1 Wind Turbines—Part 12-1: Power Performance Measurements of Electricity Producing Wind Turbines
IEC 61800-3: 2004 Adjustable Speed Electrical Power Drive Systems—Part 3: EMC Requirements And Specific Test Methods
IEC 62008 Performance Characteristics and Calibration Methods for Digital Data Acquisition Systems and Relevant Software
3 Terms and Definitions
For purposes of this document, the following terms and definitions apply.
3.1
Continuous operation (for wind turbines)
Normal operation of the wind turbine excluding start-up and shutdown operations.
3.2
Cut-in wind speed(for wind turbines)
