Operator Interface - Xantrex PV-100208 Operation And Maintenance Manual

100 kw grid-tied photovoltaic inverter

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Table Of Contents

Table of Contents

SECTION 4

OPERATION

Current Imbalance Detection

In the event of phase-to-phase current imbalance of greater than 20% between phases, the inverter will

execute an orderly shutdown, and annunciate a fault at the operator interface. See Section 5, Trouble-

shooting, for further information on this fault condition.

DC Overvoltage Detection

In the event of DC voltage greater than 600Vdc, the PV-100208 will execute an orderly shutdown and

annunciate a fault to the operator interface. If DC voltage remains greater than 600Vdc, the PV-100208

may be irreparably damaged. See Section 5, troubleshooting for further information on this fault condi-

tion.

Peak Power Tracking

The PV-100208 control software employs an active PV peak power tracker designed to maintain maxi-

mum power output from the PV array at all times of operation. The peak power voltage point varies

primarily depending upon the temperature of the PV cells. The PV-100208 constantly seeks the opti-

mum voltage and current operating points of the PV array to maintain maximum PV power output.

Upon PV wake-up, the power tracker will increase power while ramping PV array voltage to the PV

maximum power voltage reference setpoint (PPT V Ref). The change rate is governed by the power

point ramp time setpoint (PPT Ramp T). Once the PV voltage is ramped to the reference setpoint, the

PCU begins to adjust the commanded PV voltage around the reference setpoint, seeking maximum PV

power. The power tracker may only adjust the operating voltage +/- 20% of PPT V Ref. The PV

maximum power voltage step and update rate are user setable (PPT V Step and PPT Rate, respec-

tively).

If available PV power is above the maximum allowable power level of the PV-100208, the power

tracker will increase voltage as needed to maintain output power below rated maximum.

The minimum operating voltage of the PV-100208 is 330 VDC. The power tracker will not track

voltage below this point, regardless of the reference voltage setpoint.

Automatic Sleep Test

Toward the end of every solar day, the PV-100208 automatically determines when to stop producing

power dependent upon the output power of the inverter. As the net output power of the PV-100208

nears zero, a timer is started to allow the inverter to ride through any brief irradiance reductions.