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BSI PD IEC TR 61400-21-3:2019

BSI PD IEC TR 61400-21-3:2019

$167.15

Wind energy generation systems – Measurement and assessment of electrical characteristics. Wind turbine harmonic model and its application

Published By Publication Date Number of Pages
BSI 2019 36
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This part of IEC 61400 provides guidance on principles which can be used as the basis for determining the application, structure and recommendations for the WT harmonic model. For the purpose of this Technical Report, a harmonic model means a model that represents harmonic emissions of different WT types interacting with the connected network.

This document is focused on providing technical guidance concerning the WT harmonic model. It describes the harmonic model in detail, covering such aspects as application, structure, as well as validation. By introducing a common understanding of the WT representation from a harmonic performance perspective, this document aims to bring the overall concept of the harmonic model closer to the industry (e.g. suppliers, developers, system operators, academia, etc.).

A standardized approach of WT harmonic model representation is presented in this document. The harmonic model will find a broad application in many areas of electrical engineering related to design, analysis, and optimisation of electrical infrastructure of onshore as well as offshore WPPs.

The structure of the harmonic model presented in this document will find an application in the following potential areas:

  • evaluation of the WT harmonic performance during the design of electrical infrastructure and grid-connection studies;

  • harmonic studies/analysis of modern power systems incorporating a number of WTs with line side converters;

  • active or passive harmonic filter design to optimize electrical infrastructure (e.g. resonance characteristic shaping) as well as meet requirements in various grid codes;

  • sizing of electrical components (e.g. harmonic losses, static reactive power compensation, noise emission, harmonic compatibility levels, etc.) within WPP electrical infrastructure;

  • evaluation of external network background distortion impact on WT harmonic assessment;

  • standardised communication interfaces in relation to WT harmonic data exchange between different stakeholders (e.g. system operators, generators, developers, etc.);

  • universal interface for harmonic studies for engineering software developers;

  • possible benchmark of WT introduced to the academia and the industry.

The advantage of having standardized WT harmonic performance assessment by means of the harmonic model is getting more and more crucial in case of large systems with different types of WTs connected to them, e.g. multi-cluster wind power plants incorporating different types of WTs connected to the same offshore or onshore substation.

The WT harmonic model can cover the integer harmonic range up to the 40th, 50th, or 100th. And can be expanded, depending on requirements and application, to higher harmonic range as well as can also cover interharmonic components.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
10 2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
11 Figures
Figure 1 – Example of a phase angle between the harmonic current and the harmonic voltage component as well as the fundamental voltage
14 3.2 Abbreviations
15 4 General description
4.1 Overview
16 4.2 Background
Figure 2 – Example of wind power plant typical components relevant for the harmonic studies and potential challenges in harmonic performance
17 Figure 3 – Example of a WPP complex structure
18 Figure 4 – Example of a WPP complex electrical infrastructure with many WTs
19 5 Recommendations of minimal requirements
5.1 General
Figure 5 – Harmonic impedance estimated at the pointof connection specified in Figure 4
20 5.2 Application
5.3 Input parameters
5.4 Harmonic model terminal
21 5.5 Output variables
5.6 Structure
22 6 Interfaces to other IEC documents
6.1 IEC 61400-21-1:2019, Annex D – Harmonic evaluation
Figure 6 – Generic harmonic model structure representedas Norton/Thévenin equivalent circuit
23 6.2 IEC 61400-21-1:2019, Annex E – Assessment of power quality of wind turbines and wind power plants
7 Harmonic model
7.1 General
24 7.2 Thévenin/Norton equivalent circuit
7.3 Equivalent harmonic voltage/current sources
7.3.1 General
25 7.3.2 Harmonic equivalent impedance
Tables
Table 1 – Example of a representation/template of the harmonic voltage source
Table 2 – Example of a representation/template of the harmonic current source
26 7.4 Wind turbine types
7.4.1 General
7.4.2 Type 1 and Type 2
Table 3 – Example of a representation/template of the harmonic equivalent impedance
27 7.4.3 Type 3
Figure 7 – Main electrical and mechanical components of Type 3 WTs [6]
28 7.4.4 Type 4
Figure 8 – Example of a structure of a DFAG harmonic model (from [13])
Figure 9 – Main electrical and mechanical components of Type 4 WTs [6]
29 Figure 10 – Example of a converter harmonic model as Thévenin equivalentcircuit together with an example of a WT power circuit (from [9])
30 8 Validation
8.1 General
8.2 Overview
Figure 11 – Harmonic voltage comparison for respective power bins
31 8.3 Model validation
32 8.4 Fictitious grid
9 Limitations
34 Bibliography

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BSI PD IEC TR 61400-21-3:2019
$167.15