EMI Spectral Aggregation of Modulation Schemes in a lab-based DC Microgrid

Abstract

DC Microgrid research has developed in the recent years following the increasing integration of power electronic based switching devices at the point of common coupling in DC grids. This has led to electromagnetic interference problems caused by the spectral aggregation of conducted emissions in the low-frequency range (2-150 kHz). To investigate this, a framework for understanding spectral aggregation resulting from the multiple switching harmonics from the interconnected DC grid devices is analysed. In this work, three modulation techniques are applied to identical & parallel connected DC/DC converters forming a lab-based DC grid. The harmonics are then analysed for spectral aggregation using an EMI receiver. This provides insights into the spectral aggregation of conducted emissions in the low-frequency range to promote electromagnetic compatibility and further facilitate a possible framework for standardisation of DC power quality.

Modulation Algorithms of Power Electronic Converters for Shaping of Conducted Interference

“…The RanM methodology has also been utilized as prior-art for the reduction of converter power losses while achieving a target control dynamics or system power density or cost, and/or to 11 achieve a flattening of power efficiency curves as function of processed power, and to improve control dynamics in transient operations [82], [83]. On the other hand, some research such as [84], aims to generate an understanding of the equipment required to measure emissions in both the time-domain and the frequency-domain for the source and victim of EMI. In this way, a complete assessment of RanM can be done by analyzing the influence on other devices, such as the EMI victim.…”