Technical data

Transformation / DC-AC Conversion
There are two types of static converters used in the field of photovoltaics:
 Grid-switching inverter
Industrially-derived, they are based on the use of thyristors or GTOs and traditionally
are used to pilot electric motors, including those in the traction sector.
Although these are remarkably sturdy relatively cheap, they are no longer used in
photovoltaic applications because they require large filter banks to suppress the
current harmonics injected into the grid (fundamental square-wave current) and
ensure compliance with EMC requirements.
 Switching Commutation Inverter
Used in modern conversion systems based on sinusoidal PWM (Pulse Width
Modulation), both for applications and photovoltaic converters. This inverter is based
on “H” bridge architecture with IGBT (sometimes substituted by the half bridge in low
power inverters).
Operating at frequencies much higher than the grid frequency (6-20kHz), they allow a
lighter weight and smaller size of the output reconstruction filter and obtain a low
harmonic content of the current injected into the grid (THD<5%).
Energy conversion to alternating current