Working Paper Review Version 1 This version is not peer-reviewed

Power Quality Phenomena, Standards and Metrics for DC Grids

Version 1 : Received: 1 August 2021 / Approved: 2 August 2021 / Online: 2 August 2021 (16:11:02 CEST)

A peer-reviewed article of this Preprint also exists.

Mariscotti, A. Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids. Energies 2021, 14, 6453. Mariscotti, A. Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids. Energies 2021, 14, 6453.


The work addresses the problem of Power Quality (PQ) metrics (or indexes) suitable for DC grids, encompassing Low and Medium Voltage applications, including electric transports, all-electric ships and aircrafts, electric vehicles, distributed generation and microgrids, modern data centers, etc. The two main pillars on which such PQ indexes are discussed and built are: i) the physical justification, so the electric phenomena affecting DC grids and components (PV panels, fuel cells, capacitors, batteries, etc.), causing e.g. stress of materials, ageing, distortion, grid instability; ii) the existing standardization framework, pointing out desirable coverage and extension, similarity with AC grids standards, but also inconsistencies. The first point is made more clear and usable by a graphical overview of the discussed phenomena. On this basis PQ is interpreted beyond the usual low-frequency range, including thus supraharmonics and common-mode disturbance, and filling the gap with the Electromagnetic Compatibility domain. However, phenomena typical of EMC and electrical safety (such as various types of overvoltages and fast transients) are excluded. Suitable PQ indexes are then reviewed, suggesting integrations and modifications, to cover the relevant phenomena and technological progress, and to better follow the normative exigencies.


DC grid; Distortion; Electromagnetic compatibility; Inrush; Microgrid; Power Quality; Pulsed power loads; Resonance; Ripple; supraharmonics; Transients


Engineering, Electrical and Electronic Engineering

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