GE DMC490 Software Configuration Manual page 30

DMC490 Microgrid Controller Software Configuration Guide
Discharging Yes means that the storage local controller provides the
Limit Feedback maximum value of discharging power for the DMC490 to read.
No means that the value read by the DMC490 is disregarded.
For storage devices we have maximum charging power and
maximum discharging power; these are settings and fixed
values. However, for particular storage technologies, these
maximum powers are not fixed; they depend on the state of
charge (SOC). For example, we have a setting of 100 kW for
maximum discharging power but if SOC is below a certain limit
we cannot approach this maximum 100-kW limit. For these
particular storage devices, the maximum charging or
discharging powers are declared by their local controllers;
they have mathematical functions that calculate the
maximum power depending on the value of SOC; these values
are published so that an external device like the DMC490 can
read them. Given this, the DMC490 has two related settings
for storage devices: Charging Limit Feedback and Discharging
Limit Feedback. For example, when the Charging Limit
Feedback is Yes, it means that the storage local controller
provides the maximum value of charging power (this is read
by the DMC490 and used in the optimization calculation). In
this case, the value read by the DMC490 is replaced with the
maximum value already set by the user. In other words,
setting value for maximum charging power is overwritten
based on the value provided by the storage local controller
and read by the DMC490. When the Charging Limit Feedback
is set to No, then the value read by the DMC490 is disregarded.
Used by Unit Select yes to have storage contribution considered in the Unit
Commitment1 Commitment (UC) routine of the optimization problem.
The Unit Commitment problem is the task of determining a
Used by Unit
combination of power generation units each with a certain
Commitment2
capacity and operation cost so as to minimize the total
Used by Unit
operation costs while satisfying the electricity-demand
Commitment3
requirement of the microgrid in each time period.
Used by Unit
The numbers 1 to 4 specify whether or not to consider the
Commitment4
contribution of storage devices in the Unit Commitment (UC)
routine in each of the four microgrid operation modes.
Charging This setting represents energy loss from the storage device
Dissipation over time. It specifies the rate of charge dissipation, or standby
(kWh/h) loss of the storage, in kWh/h. You set this value based on your
knowledge of the storage technology used in the microgrid.
For example, some storage technologies, such as hydrogen,
have low standby losses while battery storage systems have
relatively high dissipation.
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False False
True
False False
True
0 to 1,000 0 kWh/h
kWh/h