Effect of inrush current flowing into EMI filter on the operation of ICT equipment in HVDC system

Asakimori, Koki; Murai, Kensuke; Tanaka, Toru; Babasaki, Tadatoshi

doi:10.1109/intlec.2014.6972194

Cited by 11 publications

(7 citation statements)

References 1 publication

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“…A similar occurrence was pointed out in [123], as caused by the input capacitance of EMI filters connected to LV DC grids. Reported results (experimental and simulated) show that a 500 V overshoot and 270 V undershoot may occur over a DC grid with 380 V nominal voltage, configuring an approximate ±30% excursion.…”

Section: Inrush Current and Short-circuit Currentsupporting

confidence: 72%

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Mariscotti

2021

Energies

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This 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, aging, distortion, grid instability; and (ii) the existing standardization framework, pointing out desirable coverage and extension, similarity with AC grids standards, but also inconsistencies. For the first point, each phenomenon is discussed with quantitative conclusions on relevant thresholds: in many cases some percentage of distortion (ripple) is acceptable (stress on capacitors and storage, impact on fuel cells, and PV panels), whereas in other cases, much higher levels may be tolerated (interference to protection and monitoring devices). Standards are reviewed for indications not only of low-order harmonics and voltage fluctuations typical of old DC grid schemes, but also for high-frequency noise, 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: ripple is considered in time and frequency domain, in particular with a band limited implementation; for transients and pulsed loads, more traditional indexes based on area, energy, and half duration are confronted with indexes evaluating the power trajectory and its derivative.

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Section: Inrush Current and Short-circuit Currentsupporting

confidence: 72%

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Mariscotti

2021

Energies

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“…b) the capacitance of EMI filters can draw a substantial inrush current when a load connected to the DC system is switched on, causing voltage oscillations at the point of connection of the load. When they exceed the operating voltage range, some loads may be switched off [9]. c) faults occurring on DC systems are supplied through DER converters and limited by the converters' power ratings and associated protection/control circuits.…”

Section: B Pq Concerns In DC Microgridsmentioning

confidence: 99%

“…The analysis of PQ disturbances can be broken into those originated from outside of the microgrid (external) and those originated inside the microgrid (internal) [9]. During islanded operation, there will be only disturbances with internal origin.…”

Section: Pq Concerns With External Originmentioning

confidence: 99%

Power Quality Concerns in Implementing Smart Distribution-Grid Applications

Bollen

Das

Djokić

et al. 2017

IEEE Trans. Smart Grid

193

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“…To control the harmonic currents drawn by a load converter or the voltage ripple produced by a source converter, EMI filters are generally placed at the connection with the DC bus as shown in Figure 7, and the capacitance of these filters can draw substantial inrush current [66]. The converter capacitance, together with the voltage level of the DC system and bus, filter, and capacitor reactance and resistance, determine the inrush current magnitude and characteristics [67]. While smaller filter capacitances would reduce the inrush current, the minimum size of this capacitance is generally constrained during converter design by electromagnetic interference (EMI) standards the converter must meet.…”

Section: Inrush Currentmentioning

confidence: 99%

“…This inrush current in DC distribution systems can be substantial enough to physically weld contact points together if connectors do not have sufficient tolerance, and the arc can cause other physical damage to the distribution system [69]. Even if the system is designed to withstand the resulting physical stresses, high inrush currents can cause voltage sags on the system that affect the operation of other equipment [67]. To address the issue of inrush current due to converter capacitance, pre-charge circuits or other soft-start methods are suggested [70].…”

Section: Inrush Currentmentioning

confidence: 99%

Power Quality in DC Power Distribution Systems and Microgrids

2015

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This review paper discusses power quality considerations for direct current (DC) electric power distribution systems, particularly DC microgrids. First, four selected sample DC architectures are discussed to provide motivation for the consideration of power quality in DC systems. Second, a brief overview of power quality challenges in conventional alternating current (AC) distribution systems is given to establish the field of power quality. Finally, a survey of literature addressing power quality issues in DC systems is presented, and necessary power quality considerations in DC distribution system design and operation are discussed.

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Effect of inrush current flowing into EMI filter on the operation of ICT equipment in HVDC system

Cited by 11 publications

References 1 publication

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Power Quality Concerns in Implementing Smart Distribution-Grid Applications

Power Quality in DC Power Distribution Systems and Microgrids

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