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IEEE PowerTech 2017

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Special Session (SS06): Supraharmonics – waveform distortion in the range 2 kHz to 150 kHz

Tuesday, 20 June 2017
09:00 - 10:40

Room 2.219/2.220

Organiser(s): Math Bollen, Luleå University of Technology, Sweden


There are numerous reasons for the shift from rather passive (diode- and thyristor-based) to more active (transistor-based) converters connected to the grid. Two important drivers are higher requirements on energy efficiency and strict harmonic limits. But the overall reduction in costs of power electronics and developments in automatic control are important enablers for this shift.
An adverse consequence of this is the introduction of new frequency components in the voltage and current being injected by these converters, mostly above 2 kHz. These are referred to, among other terms, as “supraharmonics”. Another source of supraharmonics is formed by power line communication, mainly with remotely-read energy meters, where the frequency range 9 to 95 kHz is allocated for use by network operators. It was mainly the use of this frequency band for communication with so-called “smart meters” that triggered standardization in the 2 to 150 kHz band. The standardization efforts are however hindered by a lack of knowledge on, among others, emission levels and propagation of disturbances.
Both the subject and the term “supraharmonics” have been subject to quite some controversy, where opinions range from “being extremely important” to “of no interest to anybody at all”. In this special session we will aim to put the subject into perspective and show that, although being an important subject for both industry and academia, there is no reason for panic concerning supraharmonics.
The presenters in this special session are three academics, which have all worked on putting the subject on the agenda, and two representatives from industry, which get in contact with disturbances in the range from 2 to 150 kHz on a regular basis. The presentations will all give different views on this interesting and still very much evolving subject.

Presentations and Speakers

1. “Measurements of supraharmonics” by Jan Meyer, Technische Universität Dresden, Germany

2. “The role of resonances in the spread of supraharmonics” by Sarah Rönnberg, Luleå University of Technology, Sweden

3. “Waveform distortion and efficiency of modern power electronic equipment” by Sasa Djokic, University of Edinburgh, UK

4. “Measurement technology for high-frequency disturbances” by Robert Olofsson, Metrum Sweden AB, Sweden

5. “High-frequency distortion in railway traction systems” by Stefan Niska, Swedish transport authority, Sweden


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