Dynamic Dead-Time Optimization And Phase Skipping Control Techniques For Three-Phase Microinverter Applications

Keywords

California Energy Commission (CEC) weighted efficiency; dead-time optimization (DTO); microinverters; phase skipping; three-phase inverters; zero-voltage switching (ZVS)

Abstract

This paper introduces a combination of two proposed efficiency improvement techniques for a microinverter with current mode control zero-voltage switching output stages. The first technique is dynamic dead-time optimization wherein pulse width modulation dead times are dynamically adjusted as a function of load current. The second method is advanced phase skipping control which maximizes inverter efficiency by controlling power on individual phases depending on the available input power from the photovoltaic source. Neither of the techniques requires any additional circuit components and both can be easily implemented in digital controller firmware. The two techniques were designed and implemented in a 400-W three-phase microinverter prototype. The experimental results validate the theoretical analysis of these techniques and demonstrate that a significant efficiency improvement can be achieved by combining the two proposed control techniques.

Publication Date

12-1-2016

Publication Title

IEEE Transactions on Industrial Electronics

Volume

63

Issue

12

Number of Pages

7523-7532

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TIE.2016.2586739

Socpus ID

84996946520 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84996946520

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