Using Optimization in Real-Time Mode
In real-time mode, when enabled, Optimization runs in the background and generates recommendations for the current network topology using predicted loads for the short-term future (for example, 4 to 6 hours).
Setting the Optimization Mode
To enable a feeder for Optimization, the feeder type must be Primary Xfmr or Primary. The feeder type can be set using Configuration Assistant Feeder Management Tab (see
Using the Feeder Management Tab on page 24-32 for details).
The Feeder’s Optimization Objective can be set to
Conservation Voltage Reduction,
Loss Minimization,
Power Factor Correction,
Relieve Violations, or
Maximize Voltage using Configuration Assistant Feeder Management Tab (see
Using the Feeder Management Tab on page 24-32 for details). Power Factor Correction will solve for a loss minimization objective, but only consider using capacitors, not LTCs or Line Regulators.
Optimization can be set to run Fast Cycle, which occurs at the end of each Feeder Load Management (FLM) cycle, or Slow Cycle, which occurs at the end of each FLM forecast.
Optimization supports four different modes of operation:
• Disabled: Optimization does not run.
Note: When a single feeder(s) is set for
Disabled mode, Optimization will restore the feeder's regulation devices to nominal during the next optimization cycle. During this scenario, the plan may consist of a blend of optimization steps and return to nominal. For example, if one feeder on a bus containing five feeders was set to
Disabled, the steps would consist of return to nominal for that feeder and optimization for the other four feeders (see
Using the Feeder Management Tab on page 24-32 for details on disabling a single feeder).
• Manual: Optimization runs periodically for every hour and configured FLM cycle time. Feeders that require optimization in specific periodic execution can be set with desired objectives modes of the feeders in the Configuration Assistant Feeder Management tab (see
Using the Feeder Management Tab on page 24-32 for details). It checks the real-time load scenario, and recommends DER dispatch and shunt device, transformer, and regulator status changes, if there is a significant benefit. The recommendation plan will not be executed automatically.
• An operator may view recommendations by opening the Optimization solution.
• An operator has to manually create a switching sheet from the plan and execute it.
• Automatic: Optimization runs periodically for every hour and configured FLM cycle time. Feeders that require optimization in specific periodic execution can be set with desired objectives and modes of the feeders in the Configuration Assistant Feeder Management tab (see
Using the Feeder Management Tab on page 24-32 for details). However, the status of the other feeders on the same substation Load Tap Changer can influence the mode of this feeder. It checks the real-time load scenario and recommends shunt device and transformer/regulator status changes, if there is a significant benefit. The recommendation plan will be executed silently. An event (O-NEW) will be created and displayed in the Work Agenda for the plan execution.
• Return to Nominal: During the next optimization cycle, Optimization will begin returning all optimization enabled devices to their nominal regulation settings. The plans will be executed automatically in real-time. This would generally be used for situations where the entire service territory needs to be returned to nominal (for example, due to an impending storm or other emergency situation). The nominal settings are stored in the NMS database and will be used in the steps generated by the tool. The application will attempt to restore any set-points, on/off thresholds, position, or step would be different from the nominal value. For example, a substation load tap changer (LTC) may have two steps to return it to nominal; the first step would be to adjust the voltage target set-point and the second would be to adjust the tap step.
Note: The Return to Nominal mode is not set on a single feeder or group of feeders; it is a global mode that is accessible from the Web Workspace Tools menu and applies to all Optimization enable feeders.
To set the optimization mode, from the Web Workspace
Tools menu, select
DMS Settings, and then
Optimization Mode, and, finally, select the desired mode (
Disable,
Manual,
Automatic, or
Return to Nominal). Also select the desired Optimization modes of the feeders in the Configuration Assistant's Feeder Management tab (see
Using the Feeder Management Tab on page 24-32 for details). Note that Feeder Load Management must be running for the Optimization Mode options to be enabled; see
Chapter 17,
Feeder Load Management for more information. Also make sure that the FLM mode of these feeders is set to
Forecasting in the Configuration Assistant Feeder Management tab (see
Using the Feeder Management Tab on page 24-32 for details).
Understanding Optimization Events in the Work Agenda
The Work Agenda
DMS Status column provides information about Optimization events and results of the calculations. When row or cell coloring is enabled in the
Web Workspace (see
“Understanding the Table Settings Menu” for more information), the
DMS Status information is color coded. Possible Optimization status results:
Understanding the Number of Retries for a Timed Out Step
If no response (related to a plan's switching action) is received from SCADA within the configured timeout period, then the switch step status will be set to a value of Failed. When the Optimization plan is executed in automatic mode, or when the plan is manually executed using the Execute the entire plan toolbar option, the plan execution can retry a timed out step for configurable number of times before it sets the status of the switch step to Failed.