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Harmonic analysis of common-mode voltage in quasi-z-source inverters

Noroozi, N ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1109/ICIT.2019.8755231
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2019
  4. Abstract:
  5. In a transformerless grid-connected photovoltaic system, many issues arise from the leakage current flow into the ground, as EMI problems. The leakage current is originated from the common-mode voltage fluctuations. In this paper, the common-mode voltage harmonics in a three-phase quasi-Z-source inverter are analyzed using Fourier transform and a closed-loop formulation is presented for the harmonics value. The shoot-through mode in a quasi-Z-source inverter causes extra fluctuations in the common-mode voltage comparing to a classic inverter. The proposed harmonic analysis method provides a systematic way to figure out how shoot-through mode and also other parameters affect the common-mode voltage. As an achievement of this method, it is possible to determine the work point of the system with the minimum leakage current. The experimental results from a reduced-voltage quasi-Z-source inverter prototype are presented to confirm the theatrical analysis. © 2019 IEEE
  6. Keywords:
  7. Common-mode voltage ; Fourier transform ; Leakage current ; Photovoltaic power system ; Quasi-Z-Source inverter ; Fourier series ; Fourier transforms ; Harmonic analysis ; Leakage currents ; Photovoltaic cells ; Closed-loop formulation ; Common mode voltage ; Grid-connected photovoltaic system ; Harmonic analysis method ; Photovoltaic power systems ; Shoot-through ; Transformerless ; Z-source inverter ; Electric inverters
  8. Source: 2019 IEEE International Conference on Industrial Technology, ICIT 2019, 13 February 2019 through 15 February 2019 ; Volume 2019-February , 2019 , Pages 1778-1783 ; 9781538663769 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/8755231