Analysis, modeling, control and operation of an interleaved three-port boost converter for DMPPT systems including PV and storage at module level

Ander González,Ramón López-Erauskin,Johan Gyselinck

doi:10.1016/j.heliyon.2019.e01402

Ander González, Ramón López-Erauskin + Show 1 more

Open Access

https://doi.org/10.1016/j.heliyon.2019.e01402

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Journal: Heliyon	Publication Date: Mar 1, 2019
Citations: 14	License type: cc-by

Affiliation: Université Libre de Bruxelles

Abstract

This paper presents the analysis, control and implementation of the interleaved three-port boost converter. The scope of this paper is the interfacing of photovoltaic systems that include storage. A new symmetrical PWM modulation strategy that prevents unwanted switching states without requiring external circuitry is presented. This modulation allows for proper sampling of the measurements, increasing thus their accuracy. Large- and small-signal models of the interleaved and non-interleaved three port boost converters are presented and transfer functions are derived for control design purposes. The different currents in the converter are controlled using control loops that govern the behavior of the converter. These loops are intuitively designed by treating them independently. With the proper loop bandwidth selection, the converter achieves fast response and good reference tracking and is suitable to interface photovoltaic and storage systems with different kinds of loads. The presented models, modulation and control loops are validated through simulation and with experimental results.

Highlights

Article No~e01402In the course of time, more countries are changing their policies to promote renewable energy sources
The growing interest in combination of renewable energy sources and energy storage systems demands for more research
The use of symmetrical carriers is more suitable for digital implementation of the system, allowing for proper scheduling of the analog-to-digital converter (ADC) sampling

Summary

Introduction

In the course of time, more countries are changing their policies to promote renewable energy sources. In 2005, 55 countries had developed policies supporting renewables, while in 2013 the number of countries rose up to 144 [1]. The growing interest in combination of renewable energy sources and energy storage systems demands for more research. Power electronic converters are key to develop efficient solutions that integrate both parts. A way to increase the efficiency of such systems is reducing the power conversion stages in the converter. There are several three-port converter solutions in the literature that aim to interface renewable sources, storage and a load using a single power conversion stage

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