Description Of The Gt100; Power Conversion System; Advanced Design Features - Xantrex GT100-208 Operation And Maintenance Manual

Introduction

Description of the GT100

Power Conversion System

Advanced Design Features

Anti-islanding
Auto-Phase
Rotation
1–2
The GT100 Grid-Tied Photovoltaic Inverter is a utility interactive, three-phase
power conversion system for grid-connected photovoltaic arrays with a power
rating of 100 kW. Designed to be easy to install and operate, the GT100 automates
start-up, shutdown, and fault detection scenarios. With user-definable power
tracking that matches the inverter to the array and adjustable delay periods, users
are able to customize startup and shutdown sequences. Multiple GT100 inverters
are easily paralleled for larger power installations.
The GT100 power conversion system consists of a pulse-width modulated (PWM)
inverter, switch gear for isolation and protection of the connected AC and DC
power sources. Housed in a rugged NEMA-3R rated, corrosive resistant, powder-
coated steel enclosure, the GT100 incorporates sophisticated Insulated Gate
Bipolar Transistors (IGBTs) as the main power switching devices. An advanced,
field-proven, Maximum Peak Power Tracker (MPPT) integrated within the
GT100 control firmware ensures the optimum power throughput for harvesting
energy from the photovoltaic array.
The advanced design of the GT100 includes an EMI output filter and the main AC
contactor located electrically on the utility side of the isolation transformer to
minimize transformer tare losses when the unit is not operating.
The GT100 also includes an Inrush Limit assembly to prevent nuisance Utility
Circuit Breaker trips when the isolation transformer is energized.
A sophisticated control scheme optimizes the operation of the GT100 cooling fan
as needed for increased overall system efficiency.
Additionally, the GT100 integrated controller contains self-protection features
including over and under voltage and frequency safeguards in compliance with
UL 1741 Rev 2005.
An integral anti-island protection scheme prevents the inverter from feeding
power to the grid in the event of a utility outage.
The GT100 includes the ability to auto-sense and correct for a "mis-phased"
connection at the AC Interface terminals. In the event the power conductors from
the utility are not phased correctly at the AC Interface terminals, the GT100 will
sense the discrepancy and automatically correct for a clockwise (A-B-C)
phase rotation.
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