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Determining maximum MPP-tracking sampling frequency for input-voltage-controlled PV-interfacing converter

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publication8th Annual IEEE Energy Conversion Congress & Exposition (ECCE 2016)
PublisherIEEE
ISBN (Electronic)9781509007370
DOIs
Publication statusPublished - 13 Feb 2017
Publication typeA4 Article in a conference publication
EventIEEE Energy Conversion Congress and Exposition -
Duration: 1 Jan 1900 → …

Conference

ConferenceIEEE Energy Conversion Congress and Exposition
Period1/01/00 → …

Abstract

A maximum-power-point tracking (MPPT) algorithm is essential in all controllers of solar power electronic converters due to the nonlinear current-voltage characteristics of a photovoltaic generator. One of the most widely utilized algorithms are perturbative MPPT techniques such as perturb and observe and incremental conductance methods due to their simple implementation with relatively good tracking performance. However, in order to optimize the performance of such algorithms, the design parameters - sampling frequency and perturbation step size - need to be designed in respect to interfaced power electronic converter. Recent studies have provided state-of-art MPP-tracking design rules for single and two-stage grid-connected PV systems. Unfortunately, the analysis of those studies does not provide analytical results for PV power transient response under feedback-controlled converters. This paper provides reduced-order transfer functions for the converters equipped with either I-type or PID-type controllers in order to approximate the maximum sampling or perturbation frequency for MPP-tracking algorithms. The analysis reveals the factors affecting the transient behavior similarly as in open-loop converter providing valuable tools for optimizing MPP-tracking perturbation frequency design.

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