Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics

Vishal Anand; Varsha Singh; Jagabar Sathik; Dhafer Almakhles

doi:10.17775/CSEEJPES.2022.02700

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Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics

Regular Papers | 更新时间：2026-10-15

- Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics
- CSEE Journal of Power and Energy Systems Vol. 9, Issue 1, Pages: 37-49(2023)
- 作者机构：
  
  1. Department of Electrical Engineering, National Institute of Technology Raipur,India
  2. Renewable Energy Lab, Prince Sultan University, Riyadh, Saudi Arabia
  3. Department of Electrical and Electronics Engineering, SRM Institute of Science and Technology, Tamil Nadu,India
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.02700
  CLC：
- Published：01 January 2023
- 稿件说明：
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Vishal Anand, Varsha Singh, Jagabar Sathik, et al. Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics[J]. CSEE Journal of Power and Energy Systems, 2023, 9(1): 37-49.
DOI：

Vishal Anand, Varsha Singh, Jagabar Sathik, et al. Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics[J]. CSEE Journal of Power and Energy Systems, 2023, 9(1): 37-49. DOI： 10.17775/CSEEJPES.2022.02700.

摘要

Abstract

The paper presents a five-level common ground type (5L-CGT)

transformer-less inverter topology with double voltage boosting. The proposed inverter uses eight switches and two capacitors

charged at input voltage level. The inverter in its basic form acts as a string inverter for low-power PV applications. However

it can be extended to work as a scalable multi-level inverter with higher power handling capability to act as a centralized inverter. The working of the inverter with the sizing of the components is presented with mathematical analysis. The efficiency of the proposed PV inverter is found using thermal losses associated with switches using PLECS software. A prototype of 1 kW has been designed

and experimentation has been carried out. Various loads with a lagging power factor up to 0.6 have been tested with the inverter to establish the usability of the proposed inverter in a worst-case emulated home-use scenario. The total harmonic distortion (THD) at the output has been recorded using a power quality analyzer with voltage and current THD values of 4.5% and 2.5%

respectively

which lies within the limits of IEEE 519 standards. The highest power conversion efficiency of the inverter has been recorded to be 96.20%.

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