A Modified Single-Phase Transformerless Z-Source Photovoltaic Grid-Connected Inverter

Hongpeng Liu; Guihua Liu; Yan Ran; Gaolin Wang; Wei Wang; Dianguo Xu

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자료유형: 학술저널

저자정보: Hongpeng Liu (Harbin Institute of Technology) Guihua Liu (Harbin Institute of Technology) Yan Ran (Harbin Institute of Technology) Gaolin Wang (Harbin Institute of Technology) Wei Wang (Harbin Institute of Technology) Dianguo Xu (Harbin Institute of Technology)

저널정보: 전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.15 No.5

발행연도: 2015.9

수록면: 1,217 - 1,226 (10page)

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In a grid-connected photovoltaic (PV) system, the traditional Z-source inverter uses a low frequency transformer to ensure galvanic isolation between the grid and the PV system. In order to combine the advantages of both Z-source inverters and transformerless PV inverters, this paper presents a modified single-phase transformerless Z-source PV grid-connected inverter and a corresponding PWM strategy to eliminate the ground leakage current. By utilizing two reversed-biased diodes, the path for the leakage current is blocked during the shoot-through state. Meanwhile, by turning off an additional switch, the PV array is decoupled from the grid during the freewheeling state. In this paper, the operation principle, PWM strategy and common-mode (CM) characteristic of the modified transformerless Z-source inverter are illustrated. Furthermore, the influence of the junction capacitances of the power switches is analyzed in detail. The total losses of the main electrical components are evaluated and compared. Finally, a theoretical analysis is presented and corroborated by experimental results from a 1-kW laboratory prototype.

#Common-mode voltage #Leakage current #Photovoltaic power system #Power loss #Pulse width modulation #Z-source inverter

참고문헌 (25)

참고문헌 신청

[학술지(정기간행물)] - Ahmet Teke / 2014 / Review of Multifunctional Inverter Topologies and Control Schemes Used in Distributed Generation Systems / Journal of Power Electronics 14 (2) : 324 ~ 340

[학술지(정기간행물)] - M. R. Islam / 2014 / A multilevel medium-voltage inverter for step-up-transformer-less grid connection of photovoltaic power plants / IEEE J. Photovoltaics 4 (3) : 881 ~ 889

[학술지(정기간행물)] - M. Amirabadi / 2014 / High-frequency AC-link PV inverter / IEEE Trans. Ind Electron 61 (1) : 281 ~ 291

[학술지(정기간행물)] - P. R. Prasanna / 2014 / Analysis, design, and experimental results of a novel soft-switching snubberless current-fed half-bridge front-end converter-based PV inverter / IEEE Trans. Power Electron 28 (7) : 3219 ~ 3230

[학술지(정기간행물)] - Kai Deng / 2014 / Novel Switched-Inductor Quasi-Z-source Inverter / Journal of Power Electronics 14 (1) : 11 ~ 21

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