Power Loss Analysis of a Single-Phase Differential Buck Inverter with Power Decoupling Utilizing Energy Stored in Output Capacitors

authored by

Lennart Hoffmann, Tobias Brinker, Jens Friebe

Abstract

With solar energy being one of the most essential sources for general energy transition towards renewable sources, the need for light and efficient photovoltaic (PV) inverters becomes crucial. A PV micro-inverter, having the advantage of omitted dc-wiring and modular flexibility becomes attractive. However, single-phase applications cause the drawback of bulky dc-link capacitors required to compensate doubled frequent power fluctuation on the solar module. This paper presents an active power decoupling method without the need of additional switches by modulating a common-mode (cm)-voltage on the filter capacitors of a differential buck inverter. Based on literature, a stability analysis and simulation is performed. The objective of this paper is to investigate the effect of different variations of dc-link voltage and filter capacitor size on decoupling performance and semiconductor losses, aiming for an optimal inverter design.

Organisation(s)

Institute of Drive Systems and Power Electronics

External Organisation(s)

University of Kassel

Type

Conference contribution

Pages

2163-2168

No. of pages

6

Publication date

2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Hardware and Architecture, Energy Engineering and Power Technology, Electrical and Electronic Engineering

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.23919/ICPE2023-ECCEAsia54778.2023.10213750 (Access: Closed)