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A transformerless Z-Source photovoltaic grid-connected inverter with coupled inductor coil
  • Yunzhong Dai,
  • Huaiyu Zhang
Yunzhong Dai
Yibin Vocational and Technical College

Corresponding Author:daiyunzhong@126.com

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Huaiyu Zhang
Yibin Vocational and Technical College
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Abstract

The quasi-Z-source H-bridge grid-connected inverter (QHGCI) is well known with its advantages of the void of shoot-through problem and the high DC-voltage utilization. But the existence of the common-mode leakage current in the power frequency cycle, lower power density and higher thermal stress makes it hardly applicable to the grid-penetrating application. Thus with a purpose to conquer the problem relating to the QHGCI, an innovative transformerless Z-Source photovoltaic grid-connected inverter with coupled inductor coil (TZPGCI-CIC) is proposed. The circuitry topology and an unipolar SPWM strategy are firstly introduced in short. And thereafter the common-mode voltage in the whole working process is derived and evaluated through the detailed operating mode analysis, in which a constant value of it has been theoretically revealed. Lastly, a prototype platform of TZPGCI-CIC is setup and its good performance on leakage current suppression, lower thermal stress are validated with the experimental results.
11 Aug 2023Submitted to Micro & Nano Letters
14 Aug 2023Submission Checks Completed
14 Aug 2023Assigned to Editor
24 Aug 2023Reviewer(s) Assigned
25 Jan 20241st Revision Received
29 Jan 2024Submission Checks Completed
29 Jan 2024Assigned to Editor
29 Jan 2024Reviewer(s) Assigned
13 Feb 2024Review(s) Completed, Editorial Evaluation Pending