Draft Advisory Electrical Concept Design

187 Pages·2017·7.37 MB·English

Document title 1

Advisory Electrical Concept
Design
Document title 2

About FOWPI
The First Offshore Wind Project of India (FOWPI) is part of the “Clean Energy Cooperation with India (CECI)
programme, funded by the European Union. The programme aims at enhancing India's capacity to deploy
low carbon energy production and improve energy efficiency, thereby contributing to the mitigation of global
climate change. Project activities will support India's efforts to secure the energy supply security, within a
well-established framework for strategic energy cooperation between the EU and India.
FOWPI is scheduled to become the first 200MW sized offshore wind farm near the coast of Gujarat, 25km off
Jafarabad. The project will focus on finalisation of design and technical specification of the windfarm
including foundation, electrical network, turbines etc.. This will also include specific technical studies for the
selected site, including coastal surveys, environmental assessments, cost-benefit analysis, transmission
layouts, monitoring systems, safety measures, and other relevant technical studies as identified. It will be
using the outputs of the Facilitating Offshore Wind in India (FOWIND) project (2013-2018) supported by the
European Union. The project will bring the vast experience of offshore wind rich European countries to India
which aims to provide technical assistance for setting up the wind-farm and creation of a knowledge centre
in the country.
The technical assistance to FOWPI is led by COWI A/S (Denmark) with key support from WindDForce
Management Ltd. (India). The project is implemented in close collaboration with the European Union, the
Ministry of New and Renewable Energy- India (MNRE) and National Institute of Wind Energy- India (NIWE).
Contract: No 2015/368469 Start 01-2016 Duration: 42 months
Disclaimer
This publication was produced with the financial support of the European Union. Its contents are the sole
responsibility of the author and do not necessarily reflect the views of the European Union

Copyright statements

Reproduction is authorised, provided the source is acknowledged, save where otherwise stated. This
publication should be cited as COWI, FOWPI – Advisory Electrical Concept Design. Draft Version, February
2018.
Where prior permission must be obtained for the reproduction or use of textual and multimedia information
(sound, images, software, etc.), such permission shall cancel the above-mentioned general permission and
shall clearly indicate any restrictions on use.
Document title 3

About the European Union
The Member States of the European Union have decided to link together their know-how, resources and
destinies. Together, they have built a zone of stability, democracy and sustainable development whilst
maintaining cultural diversity, tolerance and individual freedoms. The European Union is committed to
sharing its achievements and its values with countries and peoples beyond its borders.

The 14th annual Summit between India and the European Union (EU) was held in New Delhi on 6 October
2017. Both sides adopted a Joint Statement on Clean Energy and Climate Change, reaffirmed their
commitments under the 2015 Paris Agreement, and agreed to co-operate further to enhance its
implementation. India and the EU noted that addressing climate change and promoting secure, affordable
and sustainable supplies of energy are key shared priorities and welcomed the progress on the Clean Energy
and Climate Partnership, adopted at the 2016 EU-India Summit, and reiterated their commitment to its
implementation and further development. In particular the EU is committed to continue cooperation in view
of the cost-effective development of offshore wind in India.
Acknowledgements

FOWPI is grateful for the support provided by European Union (EU), Ministry of New and Renewable Energy-
India (MNRE), National Institute of Wind Energy- India (NIWE), and the Wind Industry.
Contact information
FOWPI Project Management
C/o Per Vølund, COWI A/S
Parallelvej 2, 2800 Kongens Lyngby
Denmark

FOWPI Project Secretariat
C/o Nikhilesh Singh, WinDForce Management Services Pvt. Ltd.
11th Floor, Vatika Professional Point
Sector-66, Golf course Extension Road
Gurgaon-122001, Haryana, India

www.fowpi.in
[email protected]
Document title 4

Wind Turbine, Layout and AEP

Document
Version
Released Edited By Modified Sections Reason for Changes
No.
Date
Draft 28/02/2018 KELA/ESMA
Document title 5
ADDRESS COWI A/S
Parallelvej 2
2800 Kongens Lyngby
Denmark

TEL [phone]
FAX [phone]
WWW cowi.com

FEBRUARY 2018
NIWE
FOWPI – ADVISORY
ELECTRICAL CONCEPT
DESIGN

PROJECT NO. DOCUMENT NO.
A073635 A073635-020-001

VERSION DATE OF ISSUE PREPARED CHECKED APPROVED
Draft 28-02-2018 KELA/ESMA ANJS/JOCN PEVL

5
ELECTRICAL CONCEPT DESIGN

CONTENTS
1 Introduction 7
2 Summary 9
3 References, abbreviations and definitions 13
3.1 References 13
3.2 Abbreviations 15
4 Design assumptions 17
4.1 Grid code requirements 17
4.2 Wind farm outline 18
4.3 Landfall location 21
4.4 Grid connection point 22
4.5 Environmental conditions 24
4.6 Power Grid Analysis 26
5 General design challenges and concepts 30
5.1 General Electrical Rating 30
5.2 Cable system type and sizing 30
5.3 Offshore Cable Systems 35
5.4 WTG - Cable system interface 48
5.5 WTG switchgear 53
5.6 HV – MV cables at OSS 57
5.7 Sub-marine-cable installation 59
5.8 Landfall / sea defence / beach 70
5.9 Installation methods – suggested for the
200MW OWF 77
5.10 Onshore cable system 79
5.11 STATCOM/SVC 84
5.12 Onshore substations 86
6 FOWPI
5.13 Control (SCADA) & communication 88
6 Conceptual design options 100
7 Recommended Design Options 102
7.1 Option 1: 3MW WTGs – 33kV cables to shore 102
7.2 Option 2: 3MW WTGs - OSS with 220kV export
cable 103
7.3 Option 3: 6MW WTGs – 66kV cables to shore 104
8 Indicative comparison 106
8.1 Capitalisation of energy losses 106
8.2 CAPEX & energy losses 107
8.3 Reliability 111
8.4 General recommendations 111
9 Supplier & Contractor Survey 113
9.1 MV/HV Cable Suppliers 114
9.2 Offshore cable installation contractors 115
9.3 Offshore platform contractors 115

APPENDICES
Appendix A Option 1. 3 MW WTG with 6x33kV
Export Cables
Appendix B Option 2. 3MW WTG with 220kV Export
Cable
Appendix C Option 3. 6MW WTG with 4x66kV Export
cables
Appendix D Survey - Cable Suppliers
Appendix E Survey – OSS Suppliers
7
ELECTRICAL CONCEPT DESIGN

1 Introduction
In the EU-funded project "First Offshore Wind farm Project in India (FOWPI)", an
offshore wind farm is planned and advisory technical documentation for a tender
call for such wind farm is being prepared. This document addresses the power
system infrastructure interconnecting the wind farm to the existing power grid.
The preliminary design elements provided in this document are thus advisory
only.
The planned offshore wind farm is a 200 MW project, located in Gujarat in the
Gulf of Khambhat, approximately 25 km off the coast, near the harbour and
container terminal of Pipavav (see Figure 1).

Figure 1 Wind farm location in Gulf of Khambath, Gujarat, in a sub-area of Zone B
identified by FOWIND studies.
This document investigates a number of preliminary grid connection options for
interconnection fir the FOWPI wind farm. The electrical infrastructure offshore
and onshore is addressed based on concept studies aimed at presenting possible
designs that may be used for this specific project, but which may also provide
inspiration for coming offshore projects in India.