See Also
The OPF Dialog, Solution Summary page displays general results from the last OPF solution. Click the Save as Aux button to save these results to a Simulator Auxiliary file.
The display contains the following fields, none of which can be directly changed:
General Results
Solution Start Time, Solution End Time
The starting time and ending time of the OPF solution algorithm.
Total Solution Time, Last Solution Status
Time and status of the last OPF solution.
Number of LP Iterations
Total number of LP iterations used during the last OPF solution. The maximum number of iterations is specified in the Maximum Number of Iterations field of the General Options page.
Initial Cost Function Value
Initial value of the OPF cost function. During the OPF the solution algorithm seeks to minimize the cost function, subject to the equality and inequality constraints.
Final Cost Function Value
Final value of the OPF cost function.
Final Slack Cost Value
The slack cost value is an artificial cost that is only non-zero when there are one or more unenforceable constraints.
Final Total Cost Value
The addition of the final cost function value and the final slack cost value.
Number of Buses in OPF
This field contains the total number of buses that are in areas or super areas that are on OPF control. Thus this field need not be equal to the total number of buses in the case. Marginal costs are only calculated for buses in OPF controlled areas or super areas.
Highest Bus Marginal Cost, Lowest Bus Marginal Cost, Average Bus Marginal Cost
Highest, lowest and average marginal cost for the buses that are in OPF controlled areas or super areas.
Bus MC Standard Deviation
The standard deviation of the Bus Marginal Cost.
Area and Superarea Constraints
Unenforceable Area Constraints
Number of unenforceable area constraints.
Unenforceable Superarea Constraints
Number of unenforceable superarea constraints.
Line MVA Constraints
The Line MVA Constraints fields present results associated with the enforcement of the line MVA constraints.
Number of Initial Violations, MVA Sum of Initial Violations
Total number of lines that initially exceeded their MVA limits and were eligible for enforcement by the OPF. For these lines only, the MVA Sum of Initial Violations field contains sum of the absolute values of the line's actual MVA flow minus the line's MVA limit.
Number of Binding Lines
Total number of lines that are constrained to their limit value.
Highest Line MVA Marginal Cost
The highest Marginal Cost for an MVA change on a line.
Number of Unenforceable Violations
Total number of lines whose MVA flows can not be enforced by the OPF using the available controls.
MVA Sum of Unenforceable Violations
For all the unenforceable lines, this field contains the sum of the absolute values of the line's actual MVA flow minus the line's MVA limit.
Interface MW Constraints
The Interface MW Constraints field present results associated with the enforcement of the interface MW constraints.
Number of Initial Violations, MW Sum of Initial Violations
Total number of interfaces that initially exceeded their MW limits and were eligible for enforcement by the OPF. For these interfaces only, the MW Sum of Initial Violations field contains the sum of the absolute values of the interface's actual MW flow minus the interface's MW limit.
Number of Binding Interfaces
Total number of interfaces that are constrained to their limit value.
Highest Interface MW Marginal Cost
The highest Marginal Cost for an MVA change on an interface.
Number of Unenforceable Violations
Total number of interfaces whose MW flows can not be enforced by the OPF using the available controls.
MW Sum of Unenforceable Violations
For all the unenforceable interfaces, this field contains the sum of the absolute values of the interface's actual MW flow minus the interface's MW limit.
Generator MW Control Limit Violations
The Generator MW Control Limit Violations fields present results associated with the enforcement of the generator MW limit constraints.
Number of Initial Violations, MW Sum of Initial Violations
Total number of generators that initially exceeded their MW limits and were eligible for enforcement by the OPF. For these generators only, the MW Sum of Initial Violations field contains the sum of the absolute values of the generators’ actual MW output minus the generators’ MW limits.
Number of Unenforceable Violations
Total number of generators whose MW limits can not be enforced by the OPF using the available controls.
MW Sum of Unenforceable Violations
For all the generators with unenforceable limits, this field contains the sum of the absolute values of the generators’ actual MW output minus the generators MW limits.
Transformer Regulation Constraints
The Transformer Regulation Constraints fields present results associated with the enforcement of phase shifting transformer regulation.
Number of Initial Violations
Total number of phase shifting transformers that initially exceeded their MW set point limits and were eligible for enforcement by the OPF.
Number of Binding Constraints
Total number of phase shifting transformers that are set at their minimum or maximum regulation value.
Number of Unenforceable Violations
Total number of phase shifting transformers whose MW regulation limits can not be enforced by the OPF using the available controls.
Fast Start Generators
The Fast Start Generators fields present results associated with the commitment/decommitment of fast start generators.
Number of Generators Turned On
Total number of fast start generators turned on during the OPF solution
Number of Generators Turned Off
Total number of fast start generators turned off during the OPF solution