See Also
To remove the line MVA violations go back to the Constraint Options Page of the OPF Options and Results dialog. Uncheck the Disable Line/Transformer MVA Limit Enforcement.
Now resolve the LP OPF, enforcing the line constraints. The resultant solution is shown below.
OPF Solution with Super Area WITH Line MVA Constraint Enforcement
With line constraint enforcement active the OPF optimally redispatches the generation taking into account the line MVA limits. However, enforcing these line constraints comes at a cost. Notice that the total case hourly cost has increased from $ 16,227 / hr to $ 16,661 / hr, which is still substantially less than the $ 16,887 / hr figure we had for the case without the superarea.
Enforcing the line constraints also has an impact on the bus marginal costs, shown below.
Impact of Line MVA Enforcement on the Bus Marginal Costs
The actual marginal cost of enforcing the line constraint can also be viewed on the OPF Line/Transformer MVA Records display. The MVA Marg. Cost tells the marginal cost of enforcing the constraint, expressed in units of $ / MVA / hr. Left-click on the MVA Marg Cost field header to sort the display using this field.
