STEVAL-ISV003V2 Datasheet, PDF (1/4 Pages) STMicroelectronics – RS-232 for communication

STEVAL-ISV003V2
250 W microinverter for plug-in PV panels (60 Hz version)
Data brief
Features
• Input voltage range from 18 V to 45 V
• Output voltage range from 110 V to
240 V AC, 60 Hz
• Grid connection algorithm and MPPT
capability
• Digital control section managed by the
STM32
• RS-232 for communication
• RoHS compliant
Description
The STEVAL-ISV003V2 is a demonstration board
which implements the microinverter concept and
is designed to optimize the power production of
each single solar panel by means of DC-AC
conversion. The conversion system is capable of
both grid synchronization and maximum power
point tracking (MPPT) thanks to the use of an
advanced control algorithm implemented on a
32-bit STM32 microcontroller. The MPPT function
is based on the perturb and observe (P&O)
concept which seeks the best operating point of
the panel, thus maximizing the energy produced
in every environmental condition. The grid
synchronization algorithm has the advantage
over standard solutions of a decoupled control of
active and reactive power. The STEVAL-
ISV003V2 demonstration board uses a high-
frequency (HF) isolated DC-DC converter with
interleaved current and an optimized full-bridge
DC-AC inverter. The typical solar panel voltage is
first stepped up to about 400 V and then
converted into AC to create a sinusoidal output.
An LED display provides a user-friendly interface
for the end user and allows monitoring and/or
modifying some of the main operating
parameters. Two modes of operation are
available and can be selected for the STEVAL-
ISV003V2 to allow either open-loop or closed-
loop operation in synchronization with the grid. In
open-loop mode the sinusoidal reference is
created internally by means of a standard lookup
table, while in closed-loop mode a sinusoidal
voltage feedback proportional to the gird voltage
is used. Finally, the RS-232 interface can be
used for serial data transfer of specified voltage,
current, and current signals.
April 2014
DocID025856 Rev 1
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