DMC490 Configuration
23
Constraint
Mode
Soft constraint means that the generator is allowed to violate its
minimum power generation level but at the cost of a penalty in the
objective function. Having the possibility of going below the
minimum power (soft constraint) can positively affect the feasibility
of the microgrid optimization problem.
Hard constraint means that the generator is not allowed to go
below its minimum power generation level.
Use this setting in conjunction with
Minimum Power Penalty
.
Hard
Soft
Hard
Minimum
Power Penalty
($/kWh)
Use this setting in conjunction with Constraint Mode. This setting
puts a numerical value on the minimum power violation. When the
violation from minimum power is critical, set a high value here.
The cost is in dollars; for other currencies simply enter that value
and be consistent in all fields involving the currency.
0 to 1,000
$/kWh
0 $/kWh
Isochronous
Operation
Mode1
Specify if isochronous or droop (non-isoch) mode is to be used for
the renewable resources in each of the microgrid operation modes.
Operation mode numbers 1 to 4 refer to operation modes for the
microgrid. Depending on the type of isochronous machine and how
the reserve margins are provided, four different operation modes
can be considered for the microgrid.
For example the following mode numbers can be used:
1.
Dispatchable/CHP isochronous load sharing
2.
Hydro in isochronous
3.
Single dispatchable/CHP in isochronous
4.
Grid in isochronous
Assume in a particular microgrid, one big hydro generator
(such as a run-of-the-rive hydro unit with a reservoir) can
operate in isochronous mode. This corresponds to Operation
Mode 2; however, any of the four operation modes can be
assigned to a single hydro unit in isochronous. If the operator
follows the suggested operation-mode assignment (that is,
Operation Mode 2 is hydro in isochronous) and Hydro 1 is
supposed to be the isochronous machine, the following are set
for this machine:
•
Operation Mode 1 = Droop
•
Operation Mode 2 = Isoch
•
Operation Mode 3 = Droop
•
Operation Mode 4 = Droop
In this manner, if you select the second mode to be the active
mode for the microgrid, then Hydro 1 can run in isochronous
mode by receiving the isochronous command from DMC490.
For the other microgrid operation modes, Hydro 1 is in non-
isochronous mode (as set by zero values).
Isoch
Droop
Droop
Isochronous
Operation
Mode2
Isochronous
Operation
Mode3
Isochronous
Operation
Mode4
Status Points
The following field mappings apply to the status and read only inputs that are to be mapped to the Microgrid
controller >
Dispatchable Asset
configuration page:
•
Online:
This field indicates if the resource is online or offline. It is not necessarily the same as being
available for use in the MGC optimization calculations.
•
Input Isoch Mode
: This field indicates if the resource is to be in droop or isochronous mode. There is an
input and output isoch mode. The input isoch mode is advice produced by the optimizer and issued to
the dispatchable asset. The output isoch mode is the actual operating mode of the dispatchable asset.
Summary of Contents for DMC490
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