Capstone Turbine Corporation
Model C65 Hybrid UPS User’s Manual
400027 Rev A (July 2010)
Page
23 of 66
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incurring any obligation either with respect to equipment previously sold or in the process of construction.
MultiPac Minimum Power
Hybrid UPS systems will normally be operating as part of a MultiPac in order to achieve at
least n+1 availability at all times. When operating in a MultiPac, the control system will
check to confirm that there are a sufficient number of Hybrid UPS systems available to
provide the preset minimum power demand before the LLCM’s will be commanded to
provide power to the load during startup. Therefore, if some units become unavailable for
any reason:
•
There can be a delay waiting for sufficient systems to meet the preset Minimum
Power Demand, and
•
The entire MultiPac system will shut down if the Minimum Power Timeout Period is
reached before sufficient systems become available.
System Start Sequences
When commanded to start from Standby Mode, there are several sequences that can
result, depending on the desired UPS or High Efficiency Mode and the conditions noted
above. Table 1 shows eight possible start sequences. Only start sequence 1 will
immediately bring power to the critical load and immediately connect to the utility. All other
sequences result in an engine start, and subsequent utility reconnection delay. While the
battery state of charge will have an impact on whether the turbine is started or not,
reconnection to the Utility grid does not depend on it. This is because there will be more
power available for recharging when both utility and turbine are available. Note that the
battery SOC of 50% can be adjusted to more or less, depending on the customer
application, and is shown in the table for purposes of explanation. If the battery system is
provided by others, the UPS Controller may not use state of charge from this external
system to provide the logic and permissive signals to the Hybrid UPS microturbines to
start and stop turbines as shown in Table 1, and therefore assumes sufficient SOC.
Table 1. System Start Sequences
Utility
Voltage
OK
Utility
Reconnect
Delay
1
>50%
OK
X
X
2
>50%
Not OK
X
X
X
X
X
3
<50%
OK
X
X
X
X
4
<50%
Not OK
X
X
X
X
X
5
>50%
OK
X
X
X
6
>50%
Not OK
X
X
X
X
7
<50%
OK
X
X
X
8
<50%
Not OK
X
X
X
X
UPS
Hi Eff
Turbine Keeps
Running
Load Connection
No
Wait
Start
Sequence
Scenario
Battery
SOC
Hybrid
UPS
Mode
Utility
Voltage
Turbine
Start
Wait for
Turbine
Start
Utility Connection
Wait for
Turbine Stop
No
Wait
Wait for
Battery
SOC
>50%
No
Wait
