ABB HiPerGuard MV UPS User Manual page 57

6.4.6. Power Exchanger and generator interfaces
6.4.6.1. Power Exchanger Interface
It is possible to configure the HiPerGuard MV UPS to provide grid support services to aid the utility grid
in the supply of power if ever the grid demand temporarily exceeds grid supply. This requires the
connection to a third party "Demand Response Controller" (DRC). The MV UPS communicates with the
DRC via an external MODBUS client (SCADA/PLC). For a detailed description of Modbus registers,
addresses and ranges, refer to the latest revision of the HiPerGuard MV UPS Modbus TCP register map
(2UCD400000E012). Optionally, hard-wired connections over a remote I/O interface module are also
available, as shown in Figure 6.8.
Note: Even though hard-wired digital/analogue interfacing is available for Power Exchanger functionality
over said remate I/O interface module, this is dependent on battery SoC information being available to
MV UPS.
A Power Exchanger functionality, when enabled, uses the UPS inverter and battery as an additional
source of power for occasions when grid capacity is temporarily at or near its limit. It monitors grid
conditions and influences the operation of the inverter and battery management to give grid support
when needed.
A portion of the battery's capacity is allocated for Power Exchanger functions. If this capacity is not
available, grid support may be disabled to ensure that the battery has adequate capacity to perform
UPS autonomy functions.
Note that DRC requests for support will be overridden at any time if the UPS considers
that the request will compromise the UPS's ability to protect the load.
In normal Power Conditioning mode, the grid supplies all the power to the load. The inverter makes only
a small contribution, mainly as power factor compensation for the input inductor. Under DRC control, if
it is sensed that the grid has temporarily reached maximum capacity, the DRC will request the MV UPS
to inject some power from the battery into the protected load.
The extreme of this state is if the grid goes into a deep sag event, or fails altogether, at which point the
HiPerGuard will enter Independent mode.
When the system is restored to normal after a grid support or load support event, the DRC is able to
control the amount of grid power allocated to bulk charging of the UPS battery.
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