.Buildings.Templates.Plants.Controls.StagingRotation.EquipmentEnable

Information

This block generates the equipment enable commands based on the active stage index uSta, the equipment available signal u1Ava and the indices of lead/lag alternate equipment, sorted by increasing staging runtime.

A staging matrix staEqu is required as a parameter.

• Each row of this matrix corresponds to a given stage.
• Each column of this matrix corresponds to a given equipment.
• A coefficient staEqu[i, j] equal to 0 means that equipment j shall not be enabled at stage i.
• A coefficient staEqu[i, j] equal to 1 means that equipment j is required at stage i. If equipment j is unavailable, stage i is deemed unavailable.
• A coefficient staEqu[i, j] strictly lower than 1 and strictly greater than 0 means that equipment j may be enabled at stage i as a lead/lag alternate equipment. If equipment j is unavailable but another lead/lag alternate equipment is available, then the latter equipment is enabled. Stage i is only deemed unavailable if all lead/lag alternate equipment specified for stage i are unavailable.
• The sum of the coefficients in a given row ∑_j staEqu[i, j] gives the number of equipment required at stage i. If this number cannot be achieved with the available equipment, stage i is deemed unavailable.
• The condition ∑_j staEqu[i+1, j] ≥ ∑_j staEqu[i, j] is required for all i < size(staEqu, 1).

The state of the enable signals is only updated at stage change, or if the number of previously enabled equipment that is available is strictly less than the number of equipment required to run. This avoids hot swapping equipment, e.g., an equipment would not be started and another stopped during operation just to fulfill the priority order. However, when a lead/lag alternate equipment becomes unavailable and another lead/lag alternate equipment can be enabled to meet the number of required equipment, then the state of the enable signals is updated.