Transformerless Photovoltaic Grid-Connected Inverter

Transformerless Photovoltaic Grid-Connected Inverter


Project Description

Transformerless Grid-Connected Inverters for domestic photovoltaic applications (4kW). The inverter has a patented modulation (UNI-TL) which uses a
topology to active six devises in order to reduce leakage to ground, which is typical of the solutions without galvanic isolation. The converter can manage two independent strings of panels thanks to a double step-up stage with two independent MPPT algorithms.

Input
Power PV Field 4400 W
Maximum Input Voltage 550 Vdc
Range MPPT 90-450 V
Maximum Current for each string 14 A
Maximum input power of each channel 2500 W
Two independent MPPT channels Yes
Output
Nominal Power 4000 W
Nominal Voltage 185 – 270 Vac
harmonic distortion <3%
Maximum efficiency 97%
European efficiency 96%
User Interface
LCD graphic matrix display 128×64
Communication Interface RS485 – Modbus