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DEW Applications

 

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  • ELECTRICAL
  • FIELD VALIDATION
  • CONTROL
  • FLUID
  • OTHER


Electrical Applications available in DEW are listed in the table below:

 

Application

Description

Capacitor Design
 Calculates size and location of capacitors needed to satisfy power factor and voltage magnitude specifications.
Circuit Component Load Analysis
 For user selected circuit locations and time periods, calculates the percent time selected components operate within specified load intervals.
Comparison of Alternative Projects
 Alternative plans for a system of circuits can be analyzed to automatically compare peaks, costs, and efficiencies over time varying load curves.
Contingency Analysis
 Automatically runs first and second contingencies on a system of feeders to determine loss of load events.
DG Control Analysis
 Evaluate use of Distributive Generators to eliminate system overloads or low voltages.
Distribution Transformer Loading Analysis
 For user selected time periods (such as a whole year), calculates the percent time each transformer operates within specified load intervals.  For example: transformer is loaded less than 25% of rating for 90% of time, with loading between 25% and 50% of rating for 10% of time.
Fault Analysis
 Calculates fault currents for radial and looped systems; works for multiple substations looped together; analyzes fault currents from distributed resource generators.
Flicker Analyses
 Flicker Analysis calculates voltage dip percentages resulting from special loads cycling in the system and compares with the standard ANSI flicker curves.
Secondary Flicker Analysis calculates sizes for various load types and capacitors that result in flicker at selected circuit locations.
Impedance/Admittance Calculations

Calculates line and cable impedances and admittances as a function of construction, temperature, and frequency.
Integrated Design
 The output of one design application (i.e. modifications the design application makes to the circuit model) can be used as the input to the next design application.  For example, the output of reconfiguration for minimum loss can be used as the input to phase balancing, then the output of phase balancing could be used as the input to capacitor design.
Load Estimation
 Combines start of circuit measurements, interior circuit measurements,  kWHr measurements, load research statistics, single large customer (kW, kVar, kVA) load measurements, special load measurements, and load growth factors (either for entire circuit or individual load) to estimate kW and kVar loading as a function of the time.
Load Forecasting
 Weather conditions may be used, including weather forecast, to estimate future loading, where future loads can be scaled based upon load growth and weather scaling factors.
Load Research Statistics Analysis

Calculates statistical parameters for each customer class; the statistical parameters are functions of the customer class, weather conditions, and user selected day and month types.
Management of Special Loads

Custom loads and load measurements may be defined and managed.
Measurement Matching
 Loads may be scaled to cause both start of circuit and simultaneously existing interior circuit measurements to be matched. Uniform scaling of 3-phase loads can be used; individual load measurements and large customer load measurements can be fixed.
Optimum Sizing of Secondary Equipment

Calculates size of distribution transformers and secondary system conductors for supplying mixed customer load classes with minimum operating costs.
Outage Analysis
 From actual field data, allows analysis of sectionalizing problems that are resulting in lower reliabilities. Can be used to predict where additional sectionalizing devices are needed or where coordination is lacking. Displays actual outage statistics on circuit model for visual analysis.
Phase Balancing
 Predicts the best phase move, the next best move, etc.  Can be performed at both start of circuit and tie switches.  Can also be performed for entire circuit or for overhead only.
Phase Prediction
 Uses kWHr and circuit measurements (both start and internal measurements) to predict phasing of one or more loads.  Also, used for phase balancing all the laterals on a circuit, when rebuilding entire circuit.
Power Flow
 Solves large scale problems from transmission level voltages down to secondary service points, including heavily meshed secondary systems.
Project Planning Tool
 Any type of circuit addition, deletion, or modification can be stored as a step in a project, where each step is planned for a specified month in the future.  For example, a lateral may be cut from one feeder and attached to another; the project may be built to any step in the plan and analysis performed on the resulting circuits.
Protection/Coordination Design
 Automatically locates protection and coordination problems within a circuit. Automatically searches the database to find list of devices that will coordinate, displays zones of protection, and can update circuit protective devices from within application.
Reconfiguration for Minimum Loss
 Calculates the minimum loss switching configuration.  Also can be used with failed components in the system to balance loading across substations.
Reconfiguration for Restoration
 For one or more failed circuit points, i.e. loss of a substation or line section, isolates failed areas and calculates power restoration switching operations, based on load priority of lost services.
Reliability Analysis
 Used to predict changes in reliability as a result of circuit modifications or to evaluate improvements in reliability due to the addition of distributed resource generation. Two Dew applications are Monte Carlo simulation and Reliability Analysis of radial feeders.
Revenue Flow

Based on customer usage and classes, calculates revenue flow for every month and hour of the year at every point in a system.
Statistical Analysis of Lightning Data
 Calculates lightning density within specified corridor around every line in Dew model; may be used to predict outages due to lightning.
Study Mode Analysis

Compares alternative control and design strategies over a time varying load pattern, also used to compare annual efficiencies, reliabilities, and costs of alternatives.
Switch Management

Switching configurations (status of all switches at a given point in time) may be stored and subsequently retrieved to restore configuration, enabling a single mouse click to operate any number of switches. Enables measurement simulation in alternate switch configurations.

Time Varying DG Fault Current Analysis

Calculates time varying fault currents due to Distributed resource Generators and predicts if the additional fault currents will affect fuse protection.
Time Varying Loading Analysis

Calculates minimum and maximum loading conditions over a user selected time period, such as a year.

 

DEW applications independently tested to validate accuracy of calculations under actual field conditions, along with some test participants are provided in the table below:

Field Validation
    DEW applications validated under field conditions include:
        • Load Estimation
        • Load Research Statistics
        • Power Flow
        • Fault Analysis
        • Reliability Analysis
        • Reconfiguration for Restoration
        • Phase Balancing
        • Capacitor Placement
    Utilities and organizations performing these DEW validations include:
        • Ameren
        • Detroit Edison
        • Con Edison
        • Orange
        • Rockland
        • National Renewable Energy Lab

 

 

 

 

 

 

 

DEW offers applications that can be used by operations for real-time control and analysis of electrical systems:

 

Application

Description

Coordinated Control of Distribution Systems

Modal control can switch between best efficiency control and maximum capacity control, immediately reconfiguring control based upon switching operations and/or system failures.  Works with any control device, including capacitors, voltage regulators, and distributed generators.
Model Validation

Interfaces directly to all types of SCADA measurements and works with a set of 3 agents to check validity of physics correlated field measurements.  Maintains statistics on errors between model and field measurements and raises flags when results exceed the statistical experience of the model; useful to detect measurements going bad, unknown switching operations, and component failures.
Real-time Forecasting of Storm Outages

Uses statistical models of outages as a function of storm type to predict expected outages as a function of time and location, allowing improved storm response.
Switching Analysis

Used by operators to check switching plans for overload or voltage problems over the existing and forecasted load patterns.

 

 

DEW also offers fluid applications that can be used to model hydraulics and water quality for water distribution systems:

 

Application

Description

Chemical Mixing Analysis

Solves for resultant chemical concentration of working fluid where multiple sources of various known constituencies mix in the network.  Uses results of fluid flow to determine mixed concentration as a function of time and location in the distribution network.
Chemical Reaction Analysis

Solves for resultant chemical concentrations throughout the fluid distribution network as a function of  known constituent's initial concentration, time of injection, and local environment.  Uses results of fluid flow to determine constituents concentration as a function of time and location in the distribution network.
Fluid Flow

Solves system hydraulics of an incompressible fluid system, giving pressure and flow results throughout the distribution network, as a function of piping, components, and elevation.

 

 

DEW offers applications that allow user to define system interdepencies and set recovery priorities to manage service restoration:

 

Application

Description

Mission Priority

Set priorities on critical loads as a function of mission, such as fire fighting, medical care, and police or military support.
Recovery Analysis

Uses dependencies among systems (such as electric, gas, fluid) to discover high priority loads that have lost service due to failures.  Then uses system reconfiguration and load shedding to restore services  when operating constraints are met.

 

EDD is actively evolving DEW applications to extend coverage to manage other utility distribution systems:

 

Application

Description

Gas Flow

EDD is in the development process to extend its DEW flow analysis capabilities to apply to compressible gas systems, which will be used to model Natural Gas and Steam distribution systems.
Sewage Flow

EDD is in the development process to extend its DEW flow analysis capabilities to apply to partial flow gravity drainage systems, which will be used to analyze sewage system flow parameters.

 

 

 

 

 

 

 

 

 


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