Title

A Single-Stage Microinverter Without Using Eletrolytic Capacitors

Keywords

Flyback; Microinverter; Photovoltaic; Power decoupling

Abstract

This paper presents a new microinverter topology that is intended for single-phase grid-connected PV systems. The proposed microinverter topology is based on a flyback converter, where an extra switch is added to separate the decoupling capacitor from the PV Module, which allows for a high voltage and voltage ripples across its terminals. This results in reducing the power decoupling required capacitance. In this manner, long lifetime low power density film capacitors can be used instead of lifetime limited high power density electrolytic capacitors, resulting in remarkable increase of microinverter's lifespan. The main advantages of the proposed topology are summarized as: 1) eliminating the double-frequency power ripple using a small film capacitor; 2) using long lifetime film capacitors, which will improve the reliability of the inverter; and 3) requiring no additional circuitry to manage the transformer leakage energy. A 100-W microinverter prototype was built to verify the proposed topology. Experimental results show that the proposed topology and its control scheme can realize the power decoupling, while maintaining very good conversion efficiency numbers. © 2013 IEEE.

Publication Date

11-12-2013

Publication Title

IEEE Transactions on Power Electronics

Volume

28

Issue

6

Number of Pages

2677-2687

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TPEL.2012.2224886

Socpus ID

84880729500 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84880729500

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