Reserve Unit Commitment

Units:	Yes/No
Mode:	Input Only
Multi-band:	False
Default Value:	False (0)
Validation Rule:	False (0) or True (-1)
Key Property:	No
Description:	If the set of Generators providing the Reserve is optimized or always includes all members of the Reserve Generators collection.
Detail:

Reserve Unit Commitment is a flag that determines if the set of Generators providing the Reserve is optimized or always includes all members of the Reserve Generators collection. The setting can take these values:

True (value = -1)

Generator providers are determined by a set of 'choice' variables in the mathematical programming formulation. For the optimal set of providers the constraints Min Provision, Min Spinning Provision, Min Regulation Provision (for Regulation Range) and Max Response are applied, but for those not chosen, these constraints are relaxed and their units do not provide the reserve.

False (value = 0)

All members of the Reserve Generators can provide the reserve. The properties Min Provision and Min Spinning Provision apply at all times e.g. for spinning-type reserves, if one of these generators is 'on' then it must provide at least the Min Spinning Provision. Likewise the constraint Max Response applies whenever the unit is 'on'.

This option can be thought of as "unit commitment" for reserve provision and involves the use of integer decision variables. Notice that for operational reserves, another integer decision variable was introduced to simulate the generator unit providing replacement reserves.

For replacement reserves, generator's Start Cost at cold state and the Reserves VO&M Charge will be included in the objective to choose the cheapest generators to provide this kind of reserves. Therefore, Reserve Cost = (Start Cost) + (Reserves VO&M Charge) x Reserves. This is also applied to the operational reserves if some replacement reserves are provided. In this case, either the raise or the replacement reserves will be chosen taking into account the reserve cost.