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Comprehensive dynamic analysis of photovoltaic generator interfacing DC-DC boost power stage

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Details

Original languageEnglish
Pages (from-to)306-314
Number of pages9
JournalIET Renewable Power Generation
Volume9
Issue number4
DOIs
Publication statusPublished - May 2015
Publication typeA1 Journal article-refereed

Abstract

In transformer-less grid-connected renewable energy systems, interfacing of photovoltaic (PV) generators is typically implemented by means of DC-DC boost-power-stage converter, mainly because of its voltage-boosting capability. In order to track the maximum power point of a PV generator, input voltage of the converter is usually feedback controlled, forcing the converter to operate as a current-sourced rather than voltage-sourced converter. Nevertheless, PV generator interfacing power stage is commonly assumed to possess the same dynamic properties as corresponding voltage-sourced power stage. Investigations presented in this study reveal explicitly that the dynamics of PV generator interfacing DC-DC boost power stage resembles conventional buck power stage behaviour with duty-cycle independent resonance and additional right-half-plane zeros. In addition, the duty cycle has to be decreased for increasing the corresponding output variables (i.e. input voltage and output current). Extended experimental results are given to support the theoretical findings.

Keywords

  • AC generators, photovoltaic power systems, maximum power point trackers, photovoltaic generator, comprehensive dynamic analysis, transformer-less grid-connected renewable energy systems, PV generators, DC-DC boost-power-stage converter, voltage-boosting capability, maximum power point tracking, input voltage, voltage-sourced converter, current-sourced converter, buck power stage behaviour, duty-cycle independent resonance, right-half-plane zeros, MPP-TRACKING CONVERTERS, SOLAR-ARRAY, VOLTAGE REGULATOR, SYSTEMS, PERFORMANCE, CAPACITANCE, INVERTER, DESIGN, ISSUES

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