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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Storage & grid integration' taking place on Wednesday, 12 March 2014 at 16:30 -18:00. The meet-the-authors will take place in the poster area.

Christer Eriksson DNV GL, Germany
Co-authors:
Nils Friedrichsen (1) F P
(1) Germanischer Lloyd, Hamburg, Germany

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Abstract

Technical note for the 'certification of electromagnetic compatibility (EMC) of wind turbines'

Introduction

Wind turbines are tall structures with high energy and high frequency electrical installations inside. With regard to the safety functions and the environmental behaviour of a wind turbine the Electromagnetic Compatibility (EMC) of the complete wind turbine system and of the single components installed inside the wind turbine becomes more and more important. Since the common practice of EMC testing and measurement is defined only for equipment to be tested in calibrated testing facilities and laboratories it is a challenge to define this practice for tall structures like wind turbines.

Approach

EMC measures at wind turbines are required in the applicable wind turbine standards, in EU directives and other regulations. The definition how to perform EMC tests and measurements is missing. With DNV GL’s new Technical Note for the ‘Certification of EMC of Wind Turbines’ this Gap shall be closed to have an applicable basis for wind Energy.

Main body of abstract

Brief content of the EMC TN is:

Immunity
All electrical devices installed in the wind turbine have to be tested separately and shall withstand the industrial limits of their product standards or at least of the IEC 61000-6-2
Main focus on:
- Main components
- Safety related parts
- Controls

All devices have to withstand Performance Criterion A
Performance Criterion A : The apparatus continues to operate as intended during and after the test. No degradation of performance is observed below the performance level specified by the manufacturer.

Installation Concept
The installation concept has to be defined including an overview of:
- Installed filters
- Shielded cables
(and the connections)
- Equipotential bonding concept
This has to be done in accordance with the installation demands of the component manufacturers.
The installation of filters, shielding of cables as well as the way how to design the equipotential bonding concept and earthing system are the most important measures for EMC. It shall be shown in the circuit diagram and in an overview of the wind turbine.

Radiated Emissions
Testing has to be done according to CISPR 11/16-2-3
Different Load cases
Measuring: At minimum 4 positions
around the WT
Antenna in nacelle direction
(and depending on WT design in
other directions e.g. tower bottom)

Conducted Emissions
Wind turbine shall be seen as a Black Box‘
Measurements have to be done at on all outgoing cables
of the wind turbine according to the corresponding standards


Conclusion

The wind power as a green and clean energy should be tidy for the environment. Due to the high energy circuits as well as the high frequency controls the electromagnetic emissions of wind turbines have to be taken into account to keep the renewable energy clean.
DNV GL as an experienced Certification Body for Renewables Energy created with the Technical Note for the ‘Certification of EMC of Wind Turbines’ a possible way to define and measure EMC of wind turbines. The gap between requirements and possibility is closed now.



Learning objectives
For a wind turbine as a complete electrical system the EMC phenomena are not easy to detect. The regulations for small electrical devices which can be measured in calibrated well defined laboratories are not applicable. To find an applicable solution for wind turbines was and is still a challenge.