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Operation Features
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Conversely, if the power comparison proves undesirable, the power tracker will
reverse the direction of the change to the “PPT_V Step”. The MPPT algorithm
within the GT100 will then continue this ongoing process of “stepping and
comparing” in order to seek the maximum power throughput from the PV array.
The changes made by the MPPT to the reference voltage are restricted to ± 40% of
“PPT V Ref” and by the maximum and minimum PV input voltage (600 and
300 V respectively). Also, the MPPT will not attempt to produce power greater
than that allowed by the “I PPT Max” setpoint. If available PV power is above the
maximum allowable power level of the GT100, the MPPT will increase voltage as
needed to maintain output power below the rated maximum.
Optimization of the GT100 MPPT will result in an increase in energy production.
The user is encouraged to study the PV array’s I-V curves and to adjust the MPPT
user settable parameters accordingly.
Utility Voltage/Frequency Fault Automatic Reset
In the event of a utility voltage or frequency excursion outside of preset limits, the
GT100 will stop operation and display a fault at the operator interface. Once the
utility voltage has stabilized within acceptable limits for a period of at least
5 minutes, the GT100 will automatically clear the fault and resume normal
operation. Voltage and frequency fault setpoints are detailed later in this section.
Figure 1-11
Maximum Peak Power Tracking
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