A Five-Level Common-Ground Inverter With Reduced Switch Count for Transformerless Grid-Tied PV Applications
- Publisher:
- Institute of Electrical and Electronics Engineers (IEEE)
- Publication Type:
- Journal Article
- Citation:
- IEEE Transactions on Industry Applications, 2024, PP, (99), pp. 1-15
- Issue Date:
- 2024-01-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| 1734659.pdf | Published version | 4.92 MB |
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Multilevel inverters with common-ground feature have been getting attention especially for grid-tied photovoltaic systems. These inverters have the grid neutral line connected to the negative pole of the dc bus, eliminating the common-mode leakage current which is a critical issue in grid-connected PV systems. This paper proposes a common-ground five-level transformerless inverter with a reduced switch count for solar photovoltaic applications. The proposed inverter comprises only four power switches, three diodes, two capacitors and two inductors. Moreover, only two switches operate at high-frequency, enabling the reduction of switching losses. The interleaved operation of a coupled inductor enhances the quality of the output current, as the first group of harmonic components is around twice the switching frequency. Additionally, a full dc- bus voltage utilization is provided and the reactive power capability is achieved. The paper details the operation modes, the design guidelines as well as a control and modulation strategy for the proper operation of the inverter. Finally, experimental results are obtained to validate the performance of the proposed grid-tied inverter.
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