Shutdown; Transition; Power Tracking; Automatic Sleep Test - Xantrex GT100-208 Operation And Maintenance Manual

Operation

Shutdown

Transition

Power Tracking

Automatic Sleep Test

Manual Current

2–4
The line interface controller is idle. The CCU2 monitors the status of the PV array
and utility grid, waiting in standby until the PV array is available to produce
power to the grid.
The intermediate transition states provide an orderly progression from one
operating state to the next. The user has the ability to manually transition the
GT100 between operating states via the operator interface keypad or remotely
using the GUI software. Manual transitions are initiated by entering a "Goal
State", where the goal state is the desired operating state. Given all applicable
system parameters are within acceptable limits, and the request is valid within the
state machine, the GT100 will initiate the proper sequence of operations necessary
to progress to the requested goal state. Refer to Figure 2-1 on page 2–3 for an
illustration of valid state transitions.
This is the standard operating state of the GT100. The GT100 maximum power
tracker will demand maximum power from the PV array, given sufficient PV
irradiance. Refer to Figure 2-2 on page 2–6 for an illustration of valid operating
states for Power Tracking.
Toward the end of every solar day, the GT100 automatically determines when to
stop producing power dependent upon the output power of the inverter. As the net
output power of the GT100 nears zero, a timer is started to allow the inverter to
ride through any brief irradiance reductions.
This operating state is provided to evaluate the existing PV array V-I
characteristics. The PV controller regulates a constant amount of PV current as
commanded by the user from the operator interface keypad, up to the PV current
limit of the GT100. If the user commands more PV current than is available, the
DC bus voltage will drop below the minimum bus voltage level and the GT100
will enter Shutdown mode.
153378