Overcurrent Protections in MV Grid with Local Energy Sources

The article presents typical methods of connecting various types of local power sources to a medium voltage network. Describes the advantages and disadvantages of individual solutions. The authors focus particularly on the issues of power system protection, with particular emphasis on overcurrent protection (ANSI 50 and 67). The key part of the article is the presentation of the selection methodology, along with examples, of setting this type of protection for a frequently encountered case - connecting local energy sources with busbars with a line with receipts.

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Advanced commercial power system protection practices applied to naval medium voltage power systems

IEEE Electric Ship Technologies Symposium, 2005. ◽

10.1109/ests.2005.1524713 ◽

2005 ◽

Cited By ~ 7

Author(s):

D. Whitehead ◽

N. Fischer

Keyword(s):

Power Systems ◽

Power System ◽

Power System Protection ◽

Medium Voltage ◽

System Protection

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Simulation Verification of Overcurrent Protection Operation in Power Networks Integrating Renewable Energy Sources in Energy Communities

Energies ◽

10.3390/en14082193 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2193

Author(s):

Mateusz Szablicki ◽

Piotr Rzepka ◽

Adrian Halinka

Keyword(s):

Renewable Energy ◽

Power Systems ◽

Power System ◽

Renewable Energy Sources ◽

Design Stage ◽

Energy Sources ◽

Power System Protection ◽

System Protection ◽

Energy Community ◽

Digital Protection

This publication discusses the risks of further use of classical overcurrent protections in modern power systems. The increasing penetration of renewable energy sources has caused a lot of challenges, among other things, the development of energy communities that balance local generation and consumption. Usually the interconnection line between the energy community and power systems are only used to balance the shortage or overflow of energy. As a result, most of the time these connections can be low loaded. Such a state can cause incorrect operation of power system protection approached, because the current level values are smaller than the required activation level for the protections. This article presents the potential incorrect operation of digital power system protection with overcurrent function. The obtained simulation results clearly show that the correctness of protection operation is strongly dependent on the level load of lines and the parameters and structure of the protection decision algorithms. These problems occur during low load line periods because these were not taken into account during the classical digital protection design stage. In the future this can cause problems with the fulfillment of the basic protection requirements of stability, speed, sensitivity. This publication suggests extra problems for power system protection research.

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Didatic Overcurrent Protection Coordination for the IEEE 34-Node Radial Test Feeder

10.48011/sbse.v1i1.2185 ◽

2020 ◽

Author(s):

Mariana A. Mendes ◽

Murillo C. Vargas ◽

Carla J. Espindula ◽

Luann G. O. Queiroz ◽

Luiz Guilherme R. Tonini ◽

...

Keyword(s):

Power Flow ◽

Energy Resources ◽

Distributed Energy Resources ◽

Power System Protection ◽

Distributed Energy ◽

Testing Methods ◽

Main Trunk ◽

System Protection ◽

Overcurrent Protection ◽

High Penetration

The IEEE Test Feeders are used in general for power flow testing methods. However the studies of it can be extended to other applications, as power system protection. This paper proposes an overcurrent protection (OCP) coordination for IEEE 34-Node Radial Test Feeder, based on the protection philosophies commonly used in Brazil, by a practical and didactic methodology. The OCP coordination proposed consist in two reclosers (R), one at substation and other at the middle of the main trunk, and fuses at the laterals. The recloser-recloser, recloser-fuse and fuse-fuse coordinations are presented and discussed. The methodology and the OCP devices used may be extended to others IEEE or real feeders. Moreover, this OCP scheme may be used as a start point to evaluate the impacts of high penetration of distributed energy resources on this feeder.

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Promising solutions for the reconstruction of small power supply systems

The Agrarian Scientific Journal ◽

10.28983/asj.y2021i4pp106-108 ◽

2021 ◽

pp. 106-108

Author(s):

Natalya Anatolyevna Kharlamova

Keyword(s):

Power Supply ◽

Energy Sources ◽

Local Energy ◽

Small Power ◽

Operating Modes ◽

Advantages And Disadvantages ◽

Supply Systems

Solutions for the reconstruction of low-capacity power supply systems are considered and analyzed. The most promising ones are highlighted. Possibilities of their application at industrial, agro-industrial and municipal facilities have been assessed, possible ranges of payback periods for power generating mini-CHP have been determined. The specificity of operating modes of local energy sources, combination and regulation of heat and power supply loads, their advantages and disadvantages are considered.

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