Capacitance minimisation & alleviation of per-phase power imbalances in cascaded PV converters

C. D. Townsend, Y. Yu, G. Konstantinou, V. G. Agelidis

Research output: Chapter in Book/Conference paperConference paper

1 Citation (Scopus)

Abstract

The Cascaded H-bridge topology is ideal for implementing large-scale converters for photovoltaic (PV) applications. The improved quality of output voltage waveforms, high efficiency due to transformer-less connection and ability to employ multiple Maximum Power Point Tracking (MPPT) algorithms are just some advantages. The main disadvantage is the required overrating to facilitate converter operation at times of unequal PV generation. Unequal generation occurs due to shading, temperature inhomogeneity and faulty cells. Capacitor voltage balancing under such conditions typically requires an increase in the number of series connected cells to inject zero sequence voltage. However, leakage current and safety requirements often dictate a need for isolation between PV arrays and the cascaded converter. Therefore, this paper proposes a converter topology that avoids the cost of extra series connected cells by making additional use of the DC-DC converters that provide isolation. H-bridge capacitor sizes are also shown to be reduced. Simulation results are presented that confirm correct operation of the proposed approach.

Original languageEnglish
Title of host publicationIECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages2160-2165
Number of pages6
ISBN (Electronic)9781479917624
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes
Event41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015 - Yokohama, Japan
Duration: 9 Nov 201512 Nov 2015

Conference

Conference41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015
CountryJapan
CityYokohama
Period9/11/1512/11/15

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