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Improved adaptive input voltage control of a solar array interfacing current mode controlled boost power stage

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalEnergy Conversion and Management
Volume98
DOIs
Publication statusPublished - 1 Jul 2015
Publication typeA1 Journal article-refereed

Abstract

Nonlinear characteristics of photovoltaic generators were recently shown to significantly influence the dynamics of interfacing power stages. Moreover, since the dynamic resistance of photovoltaic generators is both operating point and environmental variables dependent, the combined dynamics exhibits these dependencies as well, burdening control challenge. Typically, linear time invariant input voltage loop controllers (e.g. Proportional-Integrative-Derivative) are utilized in photovoltaic applications, designed according to nominal operating conditions. Nevertheless, since actual dynamics is seldom nominal, closed loop performance of such systems varies as well. In this paper, adaptive control method is proposed, allowing to estimate photovoltaic generator resistance online and utilize it to modify the controller parameters such that closed loop performance remains nominal throughout the whole operation range. Unlike previously proposed method, utilizing double-grid-frequency component for estimation purposes and suffering from various drawbacks such as operation point dependence and applicability to single-phase grid connected systems only, the proposed method is based on harmonic current injection and is independent on operating point and system topology.

Keywords

  • Adaptive control, Dynamic resistance, Photovoltaic generators

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