LT Plan Co-optimize Unit Commitment

Units:	Yes/No
Default Value:	False (0)
Validation Rule:	False (0) or True (-1)
Description:	If unit commitment is co-optimized rather than sequentially optimized with expansion

This setting applies when Production Unit Commitment Optimality = "Integer".  By default, integer unit commitment decisions are relaxed during the expansion optimization, and optimized in a second pass with the expansion solution fixed . Enabling this setting instructs LT Plan to co-optimize integer unit commitment in conjunction with the expansion optimization. Unit commitment applies to on/off decisions of resources such as Facility and Generator.

This setting is useful for smaller scale systems where the on/off decisions of resources might affect the optimal expansion. However, the resulting optimzation problem can be very hard to solve. One approach to solving such hard problem is to apply Decomposition.

By default, LT solves:

Expansion problem with expansion decisions integer, unit commitment variables continuous.

Unit commitment problem with expansion decisions fixed from 1, unit commitment variables integer.

LT Plan Co-optimize Unit Commitment is True changes then Solve a combined expansion + unit commitment problem with expansion decisions and unit commitment variables both integer. There is no second problem.