Performance

FLSIR has to perform several Load Flow solutions in order to evaluate the scenarios under consideration. As FLISR events typically happen sporadically the effects on overall system performance tend to be negligible. However the time taken to find a solution for a particular FLISR event may be longer than desired in some situations (for example some regulatory situations mandate a minimum time to ensure restored customers only experience a momentary outage). In particular there are two aspects that can impact how long FLISR can take to generate a solution that need to be considered:

Forecast Hours: FLISR looks out into the future to predict load so that it will not create plans that whilst immediately viable might have issues in a few hours. How far out FLISR looks is configurable from 0 to 24 hours.

FLISR Solution Engine: For some organizations it is necessary for FLISR to execute extremely quickly. In some parts of the world regulators provide financial incentives to restore outages within 60 seconds. To accommodate this FLISR can be configured to run in "Connected kVA" mode.

FLISR's "Connected kVA" mode is not the same as "Power Flow kVA" mode. It has certain advantages and disadvantages:

1. It will only run on radial feeders, therefore substation conditions (for example, Xfmr Overloads) may not be detected

2. It will assume nominal voltage on the feeder and will not detect voltage violation conditions

3. As it only analyzes single feeders it is considerably faster

4. As it uses the "Ladder Method" it can only support feeders that are truly radial. Feeders that are meshed or contain loops cannot be solved.

5. FLISR "Connected kVA" does not require a Power Flow license and can be implemented as a first ADMS application with significantly less data requirements.