Distribution Reliability Assessment | Distribution Network Analysis

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Reliability Assessment

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Обзор

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Features

Produce studies and reports to support long-term planning & redundancy
Model the reliability characteristics of each component
Availability & quality of power assessments
Single or double contingency studies
System-wide and feeder-wide calculations
Optionally include load flow constraints
Calculate maximum load transfer rates
Assess reliability level for the system and at each load point
Indices for customer-oriented, energy (cost) and system reliability
Reliability library data based on IEEE Std 493-2007 (Gold Book) and IEEE Std 3006.8
Unbalanced load flow constraints for alternative sources

Benefits

Accurately assess distribution reliability and potential for consumer interruption at point of service
Determine approaches to achieve optimal system reliability at minimum cost
Pinpoint areas of concern affecting the availability and quality of power supply
Enhance ongoing grid stability and reliability through data-driven decision making and maintenance strategies
Prepare comprehensive reports that demonstrate reliability standards compliance

Capabilities

Calculate indices (scroll down to see the full list)
- Bus and load point reliability
- System reliability
- Energy (cost) indices
Rank element contributions to energy (cost) indices
Consider load flow constraints, including
- Capacity of power supply
- Capacity of branch and its voltage drop
- Minimum voltage of buses
Calculate maximum load transfer rate with respect to load flow constraint
Pinpoint critical elements for load transfer per each element failure
Incorporate load transfer rates in calculation of reliability indices
Select the types of components to include in plots
Multiple phase configurations
Unbalanced system reliability calculation
Datablock visualization
GIS diagram plotting
Apply user-defined parameters & settings

Reporting

Graphical display of reliability results
Load point/bus reliability indices
System reliability indices
EENS & ECOST sensitivity analysis
Load transfer results for load flow constraints

Customer Oriented Indices

Average Load Interrupted per Connected Load Served - ALII
Average Customer Curtailment Index - ACCI
Average Service Availability Index - ASAI
Average Service Unavailability Index - ASUI
Average System Interruption Duration Index - ASIDI
Average System Interruption Frequency Index - ASIFI
Customer Average Interruption Duration Index - CAIDI
Momentary Average Interruption Frequency Index - MAIFI
Momentary Average Interruption Duration Index - MAIDI
Sector interruption cost estimates: Customer Damage Function - CDF
System Average Interruption Frequency Index - SAIFI
System Average Interruption Duration Index - SAIDI
System Customer Total Average Interruption Duration Index - CTAIDI
Other indices including but not limited to: CEMI, CELID, TIEPE, NIEPE

Energy (Cost) Indices

Component parameter library
Element contributions to the EENS & their rankings
Element contributions to the ECOST & their rankings
Expected Energy Not Supplied - EENS sensitivity analysis
Expected Interruption Cost - ECOST sensitivity analysis
Interrupted Energy Assessment Rate - IEAR
Interruption cost library
Order of most contributing components to EENS & ECOST

System Reliability Indices

Average failure rate - l
Average outage duration - r
Annual outage duration - U

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Analysis of power distribution network in Mission critical areas – Airports & Datacenters

ETAP Power System Software, with its various analysis modules is used to validate the design of Larsen & Toubro Construction – Buildings and Factories projects in airports, data centers, hospitals, office buildings etc. Network Analysis, such as Load Flow and Short Circuit Calculations, ensure load shedding and voltage drop within permissible limits, Transformer Sizing Analysis is utilized to meet standard requirements. Cable Sizing and Cable Pulling Modules, along with UG Thermal Analysis modules, validate cable routing at various underground locations. These tools allow for easy planning and approval at the initial project stage. On Safety and Protection – STAR curves help to find the correct protection and selectivity for prestigious projects with critical operations such as airports, data centers, office buildings and hospitals, to ensure smooth power flow without interruptions. Arc Flash Modules help us to quickly create & define Arc Flash Labels, as well as PPE requirements. Ground Grid Analysis is used for effective and economical earth mat design and sizing. Reliability Assessments are part of the design process to ensure the AIDI and CAIDI reliability metrics. Harmonic Analysis, for the sizing of active and passive filters allows for fine-tuning of filter design at the right locations.

Case Study

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Distribution System Reliability Analysis

Assess system for greatest improvement at minimum cost with ETAP's Reliability Assessment.

Tutorial

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