Five-Level Grid-Tied Inverter Employing Switched-Capacitor Cell with Common-Grounded Feature

Publication Type:
Conference Proceeding
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, 2020, 2020-March, pp. 3298-3303
Issue Date:
Filename Description Size
09124516.pdf1.2 MB
Adobe PDF
Full metadata record
An advanced topology of single-phase five-level transformerless grid-connected inverter is presented in this paper, which offers a common ground between the input source and the null of the grid. This alleviated the concern of variable common-mode voltage and the leakage current problem, which makes the inverter suitable for grid-tied photovoltaic (PV)-based applications. The proposed topology is operated by a series-parallel switching conversion of a switched-capacitor (SC) cell. It consists of a single dc source, two power diodes/capacitors alongside six power switches. Using the SC technique, a single-stage two times voltage boosting inverter with a self-voltage balancing of the capacitors is achieved. By employing the SC cell, five distinct voltage levels are also made at the inverter's output, so a small L-Type filter can be utilized. The control/modulation of the proposed inverter is also on the basis of a new peak current controller (PCC) technique. The circuit description along with the proposed PCC operation is discussed and a brief comparative study besides the experimental results are given at the end to demonstrate the feasibility of the proposed topology.
Please use this identifier to cite or link to this item: