This standard specifies power quality characteristic parameters, measurement procedures and power quality assessment for wind turbine generator system.
This standard is applicable to grid connected wind turbine with rotor swept area larger than or equal to 40m2.
Note 1: This standard includes:
? definition and specification of the quantities to be determined for characterizing the power quality of a grid connected wind turbine;
? measurement procedures for quantifying 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 in this standard are valid for single wind turbines with a three-phase grid connection, and as long as the wind turbine is not operated to actively control the frequency or voltage at any location in the network. The measurement procedures are valid for any size of wind turbine, though this standard only requires wind turbine types intended for PCC at MV or HV to be tested and characterized as specified in this standard.
The measured characteristics are valid for the specific configuration of the assessed wind turbine 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 ±1Hz, and sufficient active and reactive power regulation capabilities and sufficient load to absorb the wind power production. In other cases, the principles for assessing compliance with power quality requirements may still be used as a guide.
Note 2: This standard uses the following terms for system voltage:
low voltage (LV) refers to Un≤1kV;
medium voltage (MV) refers to 1kV
high voltage (HV) refers to Un<35kV.
Note 3: The issue of interharmonics is not addressed in this standard, though it is under consideration awaiting proper measurement and assessment procedures to be established by the appropriate IEC committee.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB 755-2000 "Rotating Electrical Machines-Rating and Performance" (idt IEC 60034-1:1996)
GB 1208 "Current Transformers" (GB 1208-1997, eqv IEC 185:1987)
GB/T 2900.53 "Electrotechnical Terminology-Wind Turbine Generator Systems" (GB/T 2900.53-2001, idt IEC 60050-415:1999)
GB/T 4365 "Electrotechnical Terminology-Electromagnetic Compatibility" (GB/T 4365-2003, IEC 60050(161):1990, IDT)
GB/T 13850 "Electrical Measuring Transducers for Converting A. c. Electrical Quantities to Analogue or Digital Signals" (GB/T 13850-1998, idt IEC60688:1992)
GB/T 17626.7 "Electromagnetic Compatibility-Testing and Measurement Techniques-General Guide on Harmonics and Interharmonics Measurements and Instrumentation for Power Supply Systems and Equipment Connected Thereto" (GB/T 17626.7-1998, idt IEC 61000-4-7:1991)
IEC 60050 (393) "International Electrotechnical Vocabulary (IEV)-Chapter 393: Nuclear Instrumentation: Physical Phenomena and Basic Concepts"
IEC 60186 "Voltage Transformers, Amendment 1, Amendment 2"
IEC 61000-4-15 "Electromagnetic Compatibility (EMC)-Part 4: Testing and Measurement Techniques-Section 15: Flickermeter-Functional and Design Specifications"
IEC 61800-3 "Adjustable Speed Electrical Power Drive Systems-Part 3: EMC Product Standard including Specific Test Methods"
3 Terms and Definitions
For the purposes of this standard, the terms and definitions established in GB/T 2900.53 and GB/T 4365 as well as the following ones apply.
3.1
Continuous operation (for wind turbine)
Normal operation of the wind turbine excluding start-up and shutdown operations.
3.2
Cut-in wind speed (for wind turbine)
Lowest wind speed at hub height at which the wind turbine starts to produce power.
3.3
Flicker coefficient for continuous operation (for wind turbine)
A normalized measure of the flicker emission during continuous operation of the wind turbine:
GB/T 20320-2006 The following standards are cited：
