Single-Phase Transformerless Photovoltaic Inverter With Suppressing Resonance in Improved H6

Akpınar E., Balıkcı A., Durbaba E., Turan Azizoğlu B.

IEEE TRANSACTIONS ON POWER ELECTRONICS, vol.34, no.9, pp.8304-8316, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 9
  • Publication Date: 2019
  • Doi Number: 10.1109/tpel.2018.2886054
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.8304-8316
  • Keywords: Common-mode voltage, leakage current, photovoltaic (PV) system, transformerless inverter, unipolar sinusoidal pulsewidth modulation (SPWM), LEAKAGE CURRENT, CONVERTERS, TOPOLOGIES, REDUCTION
  • Dokuz Eylül University Affiliated: Yes


In low-power applications of photovoltaic (PV) systems, the transformerless grid-connected inverters have been preferred to increase the efficiency and reduce the cost, size, and power losses when they are compared to the ones with the transformer. A transformerless single-phase inverter topology with a single dc-link capacitor for the grid-connected PV systems is proposed in this paper. The proposed inverter has been simulated by using a cooperation process of the MATLAB and SPICE package programs and it has been implemented for experimental verification. The proposed inverter reduces the high-frequency common-mode leakage current caused by parasitic capacitances of PV panels, whereas it is controlled with the unipolar sinusoidal pulsewidth modulation. Also, the results show that the common-mode voltage remains constant. The efficiency of the proposed inverter has been compared to that of the most common topologies having the dc-link decoupling during the zero voltage states. This paper is accompanied by a video file demonstrating the power loss distribution in the inverter.