Xantrex Technology PV-30208 Current Imbalance Detection, DC Overvoltage Detection

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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-30208 will execute an orderly shutdown and annunciate a fault to the operator interface. If DC voltage remains greater than 600Vdc, the PV-30208 may be irreparably damaged. See Section 5, Troubleshooting for further information on this fault con- dition.

Peak Power Tracking

The PV-30208 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-30208 constantly seeks the opti- mum voltage and current operating points of the PV array to maintain maximum PV power output.

Automatic Wake Up PV Voltage Optimization

Every day the PV-30208 wakes up and starts producing power, the control software determines if it is necessary to make adjustments to the start voltage setpoint. If the PV-30208 wakes up and determines that there is insufficient PV array power to support inverter operation, the start voltage setpoint is shifted slightly higher. This assumes that once the voltage on the array has risen, there will be greater PV power as the PV array is exposed to higher irradiance. Conversely, if the PV-30208 wakes up and determines that there is more power than is necessary to support inverter operation, the PV start voltage setpoint is lowered. The PV start voltage setpoint will usually be optimized over the period of one week. This value may be manually adjusted via the graphical user interface program to expedite the optimization process. There is also a user settable timer that determines the time required for the PV start voltage to exceed the start voltage setpoint. This timer may also be manually adjusted via the graphical user interface to help compensate for poorly placed PV arrays. The default wake-up time delay is factory set at five minutes.

Automatic Sleep Test

Toward the end of every solar day, the PV-30208 automatically determines when to stop producing power dependent upon the output power of the inverter. As the net output power of the PV-30208 nears zero, a timer is started to allow the inverter to ride through any brief irradiance reductions. The default sleep time delay is factory set at five minutes.

DOCUMENT: 151315

PV-30208 Photovoltaic Inverter

4-4

 

Operation and Maintenance Manual

 

Copyright 2003, Xantrex Technology

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Page 18 Page 20
Contents Copyright 2003, Xantrex Technology Inc South Vasco RoadTable of Contents Major Components Section Product Description IntroductionMain Enclosure Solar Control Unit SCU Section Product DescriptionInterconnection Standards Compliance Matrix Bus BoardEquipment Symbol Section Product Description SpecificationsEnclosure Front Access Panel Section Safety Safety FeaturesPV Ground Fault Detection Anti Island Protection Section Safety Isolation ProcedureUtility Side Isolation Transformer Requirements Torque and Wire Gauge SpecificationsFloor Mounted Section Installation and Initial TURN-ONInstallation Instructions InstallationSection Installation and Initial TURN-ON Phase-Sequencing Ground Fault DetectionArray Grounding Section Installation and Initial TURN-ON Frame Optional PV Conductor PV Array Ground Jumper Wiring Diagram Optional BoxPV-30208 Inverter Visual Inspection, PV-30208 Visual Inspection, PV Array WiringInitial Power Visual Inspection, Isolation Transformer WYE/WYESystem Verification Fine TuningOverview Section Operation Description of System OperationOperating States Section Operation Operation Features Section Operation Diagram Of Monopolar ConfigurationBlock Automatic Wake Up PV Voltage Optimization Peak Power TrackingCurrent Imbalance Detection DC Overvoltage DetectionSection Operation Operator Interface Example of Normal System Operation System Fault System Sleep Test System Stop System ShutdownSection Operation System Operating Parameters User Factory Password Parameter Description Section Operation Fault Conditions Section Troubleshooting GeneralIPM Device Fault 0x0001 Through Fault DescriptionsAC Line Under Frequency Fault Section TroubleshootingAC Line Voltage Low Fault AC Line Voltage High FaultCT Offset Fault AC Line Over Frequency FaultGround Current Fault DC Bus Over Voltage FaultStop Switch Fault Current Imbalance FaultSection Preventative Maintenance Periodic Maintenance TURN-ON Procedure Section Preventative MaintenanceWarranty and Certifications Section Drawings and Parts List Drawings ListOptional Accessories Page Page Page Page Page Enclosure, Upper Page Xantrex PV Series Limited Warranty and Registration
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