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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Advanced electrical systems: From megabyte to megawatt' taking place on Wednesday, 12 March 2014 at 09:00-10:30. The meet-the-authors will take place in the poster area.

Patrick Vincent CG Holdings Belgium NV, Belgium
Co-authors:
Jean Charles Beauverger (1) F P Etienne Lemaire (1)
(1) CG Holdings Belgium NV, Mechelen, Belgium

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited


Mr. Jean Charles Beauverger has been working in the wind industry for the past 6 years.
He is currently Electrical Lead Engineer at CG Belgium.
He has a joint master in electrical engineering at Ecole Centrale Lille, France and University of Technology of Munich, Germany.
Within the System Division, Jean-Charles is a design specialist for on- and offshore windsubs with a focus on the high voltage equipment.

As an electrical engineer, Patrick Vincent has held several positions within Belgian and Canadian CG transformer production facilities (engineering, production).
Currently he is in charge of business development for renewable turnkey projects.

Abstract

Optimisation of offshore substations and their transformers

Introduction

To deliver its electricity to the onshore electrical network, offshore wind farms are connected through a grid connection system consisting of the offshore and onshore substations and the export subsea and land cables. The grid connection system is considered as one of the most critical elements of offshore wind farm projects as all the power produced by the wind turbines is to transit through it.

Approach

This paper presents optimisations made in the high-voltage system of the offshore substation. In order to increase its availability and performance in the offshore environment in a cost effective manner, two levels of actions are possible. Either to work on equipment to enhance its capability to perform in this specific environnement or to work on the overall high-voltage system design. Both aspects are presented hereafter.

Main body of abstract

Recent developments in transformer design, implemented and adapted for the specific application of offshore wind, are at first discussed. A particular focus is made on hybrid insulation, and customised cooling methods, bringing to light the associated benefits such as improved overloadability and reduced foot print.
The second part of this paper deals with the design of the high voltage system of the substation. A number of boundary conditions are defined by the wind farm developer on one side and the transmission system operator on the other side. The developer specifies the characteristics of the wind farm and the grid connection availability. The transmission system operator specifies the grid codes, which are regularly updated and different from one country to the other. Taking these requirements into account, the high-voltage grid connection contractor optimises the overall system to achieve the highest availability at a reasonable cost of the substation. As part of the optimisation, appropriate transformer type, rating and level of redundancy, online-monitoring and appropriate definition of the reactive compensation equipment are defined.
Design of substations is permanently improved through the experience provided by CG transformer factories and our offshore operation and maintenance service department. This input nurtures the process to develop cost effective substations with increased availability and maintainability.


Conclusion

This paper demonstates how recent development in transformer technology applied to offshore wind farms and carefull conception of the high-voltage system fed back by operation and maintenance experience allow optimisations in the design of offshore substations. These lead to offshore substations with increased availability and performance, reducing at the same time the cost.


Learning objectives
The objective of this paper is to present different optimisation options for offshore high-voltage substation in order to enhance its availability and performance at minimum cost.