Power System Software
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Intelligent Fast Load Shedding Software - ILS™

Intelligent Load Shedding (ILS) provides fast optimal load shedding for electrical disturbances and loss of generation. Intelligent load shedding calculates the minimum required MW to be shed for each subsystem according to the type and location of the disturbance, actual operating generation, spin reserve, loading, configuration, load distribution, and priority. Intelligent load shedding then selects the best combination of loads (CBs) that will satisfy this requirement. All of this is executed in less than a few milliseconds after a disturbance occurs in the system for transient events or after user-defined time delay for steady-state overload conditions.

Fast Load Shedding Benefits

• Eliminate unnecessary load shedding
• Reduction of downtime for critical loads
• Reduction of spinning reserve requirements
• Reliable load preservation system
• Fast response to disturbances
• Operator alerts for marginal operating conditions
• Display required minimum MW & selected loads
• Trigger & time dependent load shedding
• User-definable control logics & macros
• User-definable system triggers
• Operator-friendly interface
• Display operating & recommended spin reserve
• VFD load reduction control
• System islanding logic
• Display monitored data on the one-line diagram
• Predict system response after load shed
• Log & view load shedding actions & recommendations
• Unlimited load shedding schedules
• User-defined load priority & groups
• Option to simulate & test ILS recommendations

Why ETAP Intelligent Load Shedding is Unique

• Intelligent Load Shedding (ILS) is an integral part of ETAP. This patented technology works directly with ETAP one-line diagram, analysis modules, and real-time modules.
• Intelligent Load Shedding (ILS) works on a concept of prediction of system response to different disturbances under the actual system operating conditions.
• Intelligent Load Shedding (ILS) provides fast optimal load shedding solutions under both transient and steady-state system conditions.
• Intelligent Load Shedding (ILS) provides the operator the capability to change the load shedding priority, logic, and schedules directly from the one-line diagram with user-friendly interfaces. For any changes, ILS automatically updates the ILS Controller programs.
• Although all ILS Controller programming is generated automatically by ETAP, custom ILS Controller code can easily be augmented.
• In a case of a communication failure between the ETAP Real-Time Server and the ETAP Master ILS Controller, the ILS Backup Logic will take over and control the local ILS Controllers from the ETAP Master ILS Controller.
• The Intelligent Load Shedding (ILS) Backup Logic is based on the same load shedding schedule which is specified by the system operator from ETAP. It utilizes the same triggers and calculates the amount of load shedding based on the generation deficiency and the type of disturbance.
• The operator can Verify and Validate (V&V) the Intelligent Load Shedding (ILS) logic and operation before uploading a new schedule to the ETAP Master ILS Controller, at any time during normal operation, and/or after a load shedding event has occurred. Transient stability studies with real-time data are used to V&V the ILS process.