An improved Z-source-derived converter for efficient PV integration

ABSTRACT

This paper proposes a high-voltage (HV) gain non-inverting an improved Z-source (ZS)-derived non-isolated boost converter topology. The achievement of HV gain is facilitated through the astute's integration of a ZS, a switched capacitor (SC), and a boost cell that operates with a reduced duty cycle. In comparison with earlier developed topologies, the proposed topology uses fewer components and provides HV gain. In addition to this, the converter reduces voltage stress on semiconductors and passive components. As a result, low-voltage rating (small R_ds(on)) switches and diodes can be used to reduce conduction and reverse recovery losses, respectively. The converter emphasises on reducing device count while increasing device utilisation factor and accommodating a broad range of input variations; thus, it has potential application in HV low-power distributed photovoltaic (PV) systems. Additionally, the converter draws continuous input current from the low-voltage PV terminal. The proposed converter’s operating principle is thoroughly examined in stead state. A 400 W prototype has been developed to verify the operational efficiency and theoretical assertions of the converter, with a switching frequency of 100 kHz. The converter obtained a peak efficiency of 93.25%.

KEYWORDS:

• high-voltage gain
• reduced device
• solar PV
• switched capacitor
• z-source network

Disclosure statement

No potential conflict of interest was reported by the author(s).

Credit authorship contribution statement

Yugal Kishor: Conceptualisation, proof of concept, validation, software, writing-original manuscript, R.N.Patel: Supervision, visualisation, writing-reviewing and editing, Lalit Kumar Sahu: Methodology, writing-reviewing and editing.

Data availability statement

There is no data sharing relevant to this article, nor is there any new data created.

Additional information

Funding

The authors received no funding for this work.