Suppression of multiple power line harmonic interference for low frequency signals

2013 ◽  
Vol 49 (2) ◽  
pp. 114-116 ◽  
Author(s):  
L.C. Trudeau ◽  
F. Gagnon
Keyword(s):  
Low Frequency ◽  
Power Line ◽  
Multiple Power

scholarly journals Dynamic Line Rating—An Effective Method to Increase the Safety of Power Lines

2021 ◽  
Vol 11 (2) ◽  
pp. 492
Author(s):  
Levente Rácz ◽  
Bálint Németh
Keyword(s):  
Expert System ◽  
Electric Field ◽  
High Voltage ◽  
Low Frequency ◽  
Power Line ◽  
Power Lines ◽  
Design Parameters ◽  
Monitoring Methods ◽  
Limit Value ◽  
Potential Applications

Exceeding the electric field’s limit value is not allowed in the vicinity of high-voltage power lines because of both legal and safety aspects. The design parameters of the line must be chosen so that such cases do not occur. However, analysis of several operating power lines in Europe found that the electric field strength in many cases exceeds the legally prescribed limit for the general public. To illustrate this issue and its importance, field measurement and finite element simulation results of the low-frequency electric field are presented for an active 400 kV power line. The purpose of this paper is to offer a new, economical expert system based on dynamic line rating (DLR) that utilizes the potential of real-time power line monitoring methods. The article describes the expert system’s strengths and benefits from both technical and financial points of view, highlighting DLR’s potential for application. With our proposed expert system, it is possible to increase a power line’s safety and security by ensuring that the electric field does not exceed its limit value. In this way, the authors demonstrate that DLR has other potential applications in addition to its capacity-increasing effect in the high voltage grid.

Power Line Carrier Communication Channel Model Applied to Shipboard Electric Network

2013 ◽  
Vol 385-386 ◽  
pp. 1164-1170
Author(s):  
Hong Jiang Li ◽  
Hao Lan Zhang
Keyword(s):  
Communication Channel ◽  
Channel Model ◽  
Low Frequency ◽  
Power Line ◽  
Transmission Model ◽  
Electric Network ◽  
Network Characteristics ◽  
Power Line Carrier ◽  
Power Line Carrier Communication ◽  
Ordinary Power

It is necessary to build a particular communication channel model to investigate shipboard electric network power line carrier technology. And this model must live up to characteristics of ordinary power line as well as shipboard electric network. This paper confirms the lighting network as the PLC application network in the first place, on the basis of lumped parameter transmission model, analyzes shipboard cable AC resistance, describes pulse noises of shipboard loads, and builds the shipboard PLC channel model. Comparing with the PLC multipath model of large land electric network, this channel model also reflects characteristics of high frequency time-varying selective fading and low frequency smooth fading, at the same time, lives up to shipboard electric network characteristics.

scholarly journals Aggregated Conducted Electromagnetic Interference Generated by DC/DC Converters with Deterministic and Random Modulation

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3698 ◽  
Author(s):  
Hermes Loschi ◽  
Robert Smolenski ◽  
Piotr Lezynski ◽  
Douglas Nascimento ◽  
Galina Demidova
Keyword(s):  
Power Systems ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Low Frequency ◽  
Power Electronic ◽  
Laboratory Setup ◽  
Measuring Techniques ◽  
Random Modulation ◽  
Multiple Power ◽  
Harmonic Components

The assessment of electromagnetic compatibility (EMC) is important for both technical and legal reasons. This manuscript addresses specific issues that should be taken into account for proper EMC assessment of energy systems that use power electronic interfaces. The standardized EMC measuring techniques have been used in a laboratory setup consisting in two identical DC/DC converters with deterministic and random modulations. Measuring difficulties caused by the low frequency envelopes, resulting from frequency beating accompanying aggregation of harmonic components of similar frequencies, were indicated as a phenomenon that might lead to significant problems during the EMC assessment using currently binding standards. The experimental results describing deterministic and random modulated converters might be useful for practitioners implementing power interfaces in microgrids and power systems as well as for researchers involved in EMC assurance of power systems consisting in multiple power electronic interfaces.

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