AN3095 datasheet(1/55 Pages) STMICROELECTRONICS

Part #	AN3095

Description	The STEVAL-ISV002V2 demonstration board is the same

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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November 2012

Doc ID 16555 Rev 3

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AN3095

Application note

STEVAL-ISV002V1, STEVAL-ISV002V2 3 kW

grid-connected PV system, based on the STM32F103xx

Introduction

The STEVAL-ISV002V2 demonstration board is the same as the STEVAL-ISV002V1, but

assembled in a metal suitcase. In recent years, the interest in photovoltaic (PV) applications

has grown exponentially. As PV systems need an electronic interface to be connected to the

grid or standalone loads, the PV market has started appealing to many power electronics

manufacturers. Improvements in design, technology and manufacturing of PV inverters, as

well as cost reduction and high efficiency, are always the main objectives, [see References

1, 2].

This application note describes the development and evaluation of a conversion system for

PV applications with the target of achieving a significant reduction in production costs and

high efficiency. It consists of a high frequency isolated input power section performing DC-

DC conversion and an inverter section capable of delivering sinusoidal current of 50 Hz to

the grid. The system operates with input voltages in the range of 200 V to 400 V and is tied

to the grid at 230 Vrms, 50 Hz, through an LCL filter. Other peculiar characteristics of the

proposed converter are the integration level, decoupled active and reactive power control

and flexibility towards the source. A prototype has been realized and a fully digital control

algorithm, including power management for grid-connected operation and an MPPT

(maximum power point tracking) algorithm, has been implemented on a dedicated control

board, equipped with a latest generation 32-bit (STM32F103xx) microprocessor.

Figure 1.

3 kW PV system image

www.st.com

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