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Three-phase quasi-Z-source inverter with constant common-mode voltage for photovoltaic application

Noroozi, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TIE.2017.2774722
  3. Abstract:
  4. In trasformerless grid-connected photovoltaic (PV) systems, common-mode voltage (CMV) fluctuations cause leakage current flow through the stray capacitance of the PV panels. Shoot-through (SH) states in a quasi-Z-source inverter (q-ZSI), increase the amplitude of high order harmonics of CMV. In this paper, by using the modulation technique based on odd PWM (OPWM) and minor change in the Z network of the three-phase q-ZSI, the leakage current is blocked. No extra semiconductor element is added. By the proposed technique, CMV is kept nearly constant during switching cycles. The experimental results for CMV analysis in a 1kW prototype are presented to verify the theoretical analysis. IEEE
  5. Keywords:
  6. Impedance ; Inverters ; Leakage current ; Leakage currents ; Odd PWM ; Photovoltaic power system ; Quasi-Z-Source inverter ; Capacitance ; Electric impedance ; Modulation ; Nobelium ; Photovoltaic cells ; Pulse width modulation ; Semiconductor diodes ; Switches ; Voltage control ; Common mode voltage ; Grid-connected photovoltaic system ; High order harmonics ; Modulation techniques ; Photovoltaic applications ; Photovoltaic power systems ; Semiconductor element ; Z-source inverter ; Electric inverters
  7. Source: IEEE Transactions on Industrial Electronics ; 2017 ; 02780046 (ISSN)
  8. URL: https://ieeexplore.ieee.org/document/8114205