Ppendix; The Micro Inverter System; Characteristics Of Micro Inverters - ABB CDD Product Manual

T
he MICRO inverter system
This system is composed of a group of MICRO Inverters that convert direct electric current from a photovoltaic
module into alternating electric current and feed it into the utility grid.
Photovoltaic modules transform energy from the sun into direct current (DC) electrical energy (through a
photovoltaic field, also called photovoltaic module). In order to use it, it is necessary to transform the type of
current into alternating "AC". This conversion, known as DC to AC inversion, is made efficiently without using
rotating parts and only through static electronic devices.
In order to allow inverter operation in safe thermal and electrical conditions, in the event of adverse environmental
conditions or unsuitable input voltage values, the unit automatically reduces the value of the power fed into the
grid. This way the solar energy system compensates for the energy drawn from the utilities connected to the
grid to which it is linked. The solar energy system then powers all connected electrical devices, from lighting to
household appliances, etc.
When the photovoltaic system is not supplying sufficient power, the power needed to ensure normal operation
of the connected electrical devices is drawn from the utility grid. If, on the other hand, excess power is produced,
this is fed directly into the grid, becoming available to other consumers.
In accordance with local and national regulations, the power produced can be sold to the grid or credited
towards future consumption. Each inverter will work independently of the others and will supply the grid with
the maximum power available from its photovoltaic panel.
C
haracteristics of MICRO inverters
Unlike systems subdivided into strings controlled by one or several inverters, systems of this
sort are built for the incorporation of a MICRO Inverter for each photovoltaic module.
Each MICRO Inverter works independently of the others, thus its own photovoltaic module
supplies the maximum power available to the grid. This setup enables a direct control over
the production of a single photovoltaic module, consequently optimizing production as much
as possible.
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