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Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
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Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
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The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
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Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Implementation of a software defined FLISR solution on an active distribution grid.

Darren Leniston1, David Ryan1, Clem Power2

  • 1Programmable Autonomous Systems Unit, Walton Institute for Information and Communication Systems Science, Waterford City, Waterford City, Co. Waterford, Ireland.

Open Research Europe
|August 30, 2023
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Summary
This summary is machine-generated.

A new software-driven Fault Location, Isolation and Service Restoration (FLISR) solution enhances grid resiliency. This technology reduces customer interruptions and improves service quality by enabling faster fault resolution for distribution system operators.

Keywords:
Distribution AutomationFLISRSCADASelf-HealingSmart Grids

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Grid Modernization

Background:

  • Distribution grid resiliency is a growing concern for Distribution System Operators (DSOs) due to climate change impacts.
  • Inclement weather causes faults, leading to service disruptions and negatively impacting DSO Key Performance Indicators (KPIs) like Customer Minutes Lost (CML) and Customer Interruptions (CI).
  • These disruptions result in financial penalties for DSOs imposed by regulators.

Purpose of the Study:

  • To propose and evaluate a software-driven Fault Location, Isolation, and Service Restoration (FLISR) solution.
  • To leverage modern software and communication technologies integrated with existing DSO infrastructure.
  • To reduce CMLs and CIs, thereby minimizing financial penalties.

Main Methods:

  • Development of a software-driven FLISR solution.
  • Integration of modern software and communication technologies with existing DSO infrastructure.
  • Field trial of the FLISR solution in a high-fault area of south-east Ireland.

Main Results:

  • The FLISR solution was tested in an area prone to service loss.
  • The solution's outputs indicated potential for faster fault event resolution compared to current DSO systems.
  • The trial provided an ideal environment to assess the solution's effectiveness.

Conclusions:

  • The FLISR solution, utilizing modern software and existing grid infrastructure, benefits DSOs.
  • Improvements were observed in grid management and operations.
  • Enhanced quality of service for customers was demonstrated.