FLM Island Statistics Window
Statistics pertaining to the performance of real-time power flow and FLM solutions are available through the FLM Islands Statistics window, which is accessed by selecting FLM Islands Stats... from the Web Workspace Tools menu. By default, this option is only available for Administration or Trainer user types.
The tool is a visualization of the FLM_ISLANDS database table. The table is updated every time the periodic FLM solution runs; with the default product configuration, this is every 900 seconds (15 minutes). Various information about the performance of the solution is written to that table.
An island is defined to be all network fed from the same (set of) energization sources. For most customers, this is typically a substation and its distribution feeders. If the model is split, islands start at the location of the split.
The tool is useful in getting a high-level summary on the performance of the power flow engine for real-time solves and allows application support staff to identify areas of the model that are having difficulty solving.
The columns shown by default on the page are:
Column Name
Description
Island Name
The name of the island as determined by one of the energization sources and the corresponding entry in the data model FEEDERS table.
Status
The status of the power flow solution. These match the values reported in FLM. Typically, this can be one of: Solved, Suspect SCADA, Model error, Failed.
Updated
The time the last information was written for this island.
Solve Time
The time take to perform the state estimation, power flow solution, and SCADA load allocation.
Supply Connections
Report how many energization source nodes feeder the island.
Feeders
How many FID or MID nodes are present in the model. This is broadly related to the number of distribution feeders plus power transformers. The exact location of each of these nodes is determined during model design and project implementation.
Buses
Number of connection points in the island. Each device (Transformer, switch, conductor, and so on) has a connection point at each end.
Powerflow Iterations
Number of iterations of the power flow engine to converge on a solution.
State Estimator Iterations
Number of iterations of the state estimator (capacitor status, network protector status, and/or regulating DERs) to converge on a solution.
SCADA Iterations
Number of iterations of the SCADA load allocation engine to converge on a solution.
Total Iterations
Sum of the previous three columns.
Voltage Violations
Number of voltage violations (Low or High) detected by the power flow.
Flow Violations
Number of thermal violations detected by the power flow.
Transformers
Number of transformers in the islands. This figure typically excludes service transformers as they tend to be modeled as load points for the power flow. If, however, the load and DER behind the xfmr is dis-aggregated then the service transformers do get included in this count. This is implementation dependent and typically depends on the level of behind the meter DER penetration there is in a service territory.
Shunts
Number of shunted devices (capacitors, SVCs, or reactors) in the island.
Switches
Number of switchable devices (typically breakers, reclosers, load-break switches, non-load break switches, and fuses).
Distributed Generators
Number of DER units (primary and behind the meter) that are in the island.
 
Columns available but hidden by default include:
Column Name
Description
kW Gen Phase A|B|C
Per phase real power generation in the island.
kVAr Gen Phase A|B|C
Per phase reactive power generation in the island (excludes Caps, SVC, and Reactors).
kW Load Phase A|B|C
Per phase real power load in the island.
kVAr Load Phase A|B|C
Per phase reactive power load in the island.
kW Cap Phase A|B|C
Per phase real power support in the island (from Caps, SVC, and Reactors). Almost always zero.
kVAr Cap Phase A|B|C
Per phase reactive power support in the island (from Caps, SVC, and Reactors).
kW Loss Phase A|B|C
Per phase technical real power loss in the island (typically from conductors).
kVAr Loss Phase A|B|C
Per phase technical reactive power loss in the island (typically from conductors).
kW Xfmr Loss Phase A|B|C
Per phase technical real power loss in the island from transformers (excludes service transformers modeled as loads).
kVAr Xfmr Loss Phase A|B|C
Per phase technical reactive power loss in the island from transformers (excludes service transformers modeled as loads).
SRC Class
The class handle of one of the energization sources feeding the island.
SRC Index
The index handle of one of the energization sources feeding the island.
 
The statistics table supports all standard table functionality for the NMS user interface, including filtering, automatic filtering, column selection, column locking, copying, and printing.
You can select a row and navigate to the island in the Viewer by clicking the Viewer Focus button ().
The rows have the following context menu options:
• Auto Filter: Activates auto filtering based on the selected cell.
• Show Errors and Statistics...: Opens the FLM Feeder Errors, Warnings, and Details window, which displays detailed information about model data errors and warnings. The FLM Feeder Errors, Warnings, and Details window also provides a deep dive into the solution details and information about the areas of the model where convergence is taking a long time.