STEVAL-ISV003V1 Datasheet, PDF (1/12 Pages) STMicroelectronics – 250 W microinverter for plug-in PV panels demonstration board

STEVAL-ISV003V1
250 W microinverter for plug-in PV panels
demonstration board
Data brief
Features
■ Input voltage range from 18 V to 45 V
■ Output voltage range from 110 V to 240 V AC,
50/60 Hz
■ Grid connection algorithm and MPPT capability
■ Digital control section managed by the STM32
■ Reactive power management
■ RS-232 for communication
■ RoHS compliant
Description
The STEVAL-ISV003V1 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 in the
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
under any environmental condition. The grid
synchronization algorithm has the advantage over
standard solutions of a decoupled control of
active and reactive power. The STEVAL-
ISV003V1 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 which allows monitoring and/or
modifying some of the main operating
parameters. Two modes of operation are available
and can be selected to allow either open-loop
operation or closed-loop operation in
synchronization with the grid.
STEVAL-ISV003V1
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 grid voltage,
is used. The system can be connected to either a
50 Hz or 60 Hz network, depending on local
requirements. Finally, the RS-232 interface can be
used for serial data transfer of specified voltage,
current and current signals.
October 2011
Doc ID 022334 Rev 2
For further information contact your local STMicroelectronics sales office.
1/12
www.st.com
12