Field programmable gate array-based control method for a pulse density modulated microinverter operating in island mode

• Published in: IET power electronics 2016-11, Vol.9 (14), p.2621-2630
• Main Authors: Korošec, Lucijan, Konjedic, Tine, Truntič, Mitja, Rodič, Miran, Milanovič, Miro
• Format: Article
• Language: English
• Subjects: field programmable gate arrays; field programmable gate array‐based control method; invertors; island mode; load transients; pulse density modulated microinverter; switching frequency; zero current switching
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2015.1021

This study proposes a new control method for a pulse-density modulated microinverter and its implementation within a field programmable gate array circuit. The structure and operating principle of the studied microinverter demand implementation of a pulse-density modulation-based control method with two independent control loops. The first one ensures a constant input current from the source while the second one provides a sinusoidal voltage at the converter's output. At the same time the implemented control method ensures zero-current switching of the utilised power transistors in decoupling and output stages which allows operation at high switching frequency. The performance of the proposed control method for a microinverter operating in island mode was experimentally verified in steady-state operation, as well as during load transients.