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Reduced common-mode voltage in Z-source inverters

Noroozi, N ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1109/PEDSTC.2017.7910361
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2017
  4. Abstract:
  5. Z-source family has been widespread in photovoltaic (PV) applications. In trasformerless grid-connected PV systems, the common mode voltage (CMV) time variations, cause the leakage current flow. This current flows through the stray capacitance of the PV panels. For a Z-Source Inverter (ZSI), the CMV would have higher high-frequency harmonics, due to the shoot through states within the switching cycles. In this paper, the CMV of a ZSI is analyzed and a simple method is proposed for the harmonic reduction of the CMV in the ZSI. The CMV reduction method is based on changing the switching states. The CMV in reduced method is compared to the CMV in the traditional ZSI in frequency domain by using modulated Fourier transform (MFT) method. The results are verified through the simulation of a lkw ZSI. © 2017 IEEE
  6. Keywords:
  7. Common-mode voltage ; Leakage current ; Modulated Fourier transform ; Photovoltaic power system ; ZSource inverter ; Capacitance ; Electric inverters ; Frequency domain analysis ; Leakage currents ; Photovoltaic cells ; Power electronics ; Common mode voltage ; Grid connected PV system ; Harmonic reduction ; High-frequency harmonics ; Photovoltaic power systems ; Stray capacitances ; Z-source inverter ; Z-source inverters (ZSI) ; Fourier series
  8. Source: 8th Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2017, 14 February 2017 through 16 February 2017 ; 2017 , Pages 413-418 ; 9781509057665 (ISBN)
  9. URL: https://ieeexplore.ieee.org/abstract/document/7910361