Abstract
Advances in power electronics, increasing share of renewables in the energy system and e-mobility cause an increase of disturbances in the frequency range 2–150 kHz, also known as supraharmonics. A rigorous, credible and agreed measurement framework is essential to evaluate electromagnetic compatibility (EMC) in this frequency range. While a normative method exists for measuring equipment emission in the laboratory, no normative method exists yet for the measurement of supraharmonic disturbance levels in the grid. The aim of this research is a detailed comparison of potential measurement methods derived from existing standards IEC 61000-4-7, IEC 61000-4-30, CISPR 16-1-1 and a critical assessment of their suitability for disturbance measurements in grid applications. Based on a comprehensive set of synthetic signals and real measurements from laboratory and field, this article studies the ability of the methods to assess the typical characteristics of supraharmonic emission with relevance to EMC coordination. It presents the benefits and drawbacks of the existing measurement methods and discusses the suitability of possible modifications for grid compliance assessment. The results and recommendations intend to be an input for the present activities of IEC SC 77A WG 9 to define a normative method for the measurement of supraharmonic disturbance levels to be included in the next edition of IEC 61000-4-30.
Highlights
Due to the increasing use of renewables and electric vehicle (EV) chargers as well as the continuous rise of energy efficiency in modern mass-market appliances, a tendency in shifting emission from lower to higher frequencies is observed
The selected methods are based on the specifications in present standards IEC 61000-4-7, IEC 610004-30 and CISPR 16-1-1
The presented results shall contribute to the ongoing discussion towards a normative measurement method for the frequency range 2-150 kHz for the edition of IEC 61000-4-30
Summary
Due to the increasing use of renewables and electric vehicle (EV) chargers as well as the continuous rise of energy efficiency in modern mass-market appliances, a tendency in shifting emission from lower to higher frequencies is observed. An essential part of the Electromagnetic Compatibility (EMC) coordination is a credible and agreed framework. For the measurement of emission and disturbance levels in this frequency range. A normative method (mandatory for compliance with a standard) is defined only for the measurement of device emission under laboratory conditions to assess compliance with equipment limits. A standardization framework for the measurement of disturbance levels in the grid, e.g. to compare them with compatibility levels, is still lacking but urgently required. Due to its informative character, these methods are considered as optional requirements, but are not mandatory for compliance with the respective
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