Preprint Article Version 1 This version is not peer-reviewed

A Single-Stage Buck-Boost Three-Level Neutral-Point-Clamped Inverter with Two Input Sources for the Grid-Tied Photovoltaic Power Generation

Version 1 : Received: 28 February 2017 / Approved: 1 March 2017 / Online: 1 March 2017 (09:31:28 CET)

How to cite: Ge, X.; Gao, F.; Chen, M. A Single-Stage Buck-Boost Three-Level Neutral-Point-Clamped Inverter with Two Input Sources for the Grid-Tied Photovoltaic Power Generation. Preprints 2017, 2017030003 (doi: 10.20944/preprints201703.0003.v1). Ge, X.; Gao, F.; Chen, M. A Single-Stage Buck-Boost Three-Level Neutral-Point-Clamped Inverter with Two Input Sources for the Grid-Tied Photovoltaic Power Generation. Preprints 2017, 2017030003 (doi: 10.20944/preprints201703.0003.v1).

Abstract

This paper proposes a novel single-stage buck-boost three-Level neutral-point-clamped (NPC) inverter with two independent dc sources coupled for the grid-tied photovoltaic (PV) application, which can effectively solve the unbalanced operational conditions generally appeared between two coupled independent PV sources induced by the unequal irradiation and temperature distribution. The proposed control scheme can simultaneously guarantee the maximum power point (MPP) operation of both PV sources and maintain the output waveform quality. Compared to the traditional two-stage PV inverter, the proposed NPC inverter could reduce the PV array voltage requirement and dc-link capacitors’ voltage rating, meanwhile show the advantage in operational efficiency. MATLAB simulations and the captured experimental results are presented to show the performance of the proposed three-level inverter.

Subject Areas

neutral-point-clamped inverter; buck-boost inverter; single stage conversion; photovoltaic inverter

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