A Transformerless 1-, 5-level Half-Bridge PV Inverter Configuration based on Switched-Capacitor Technique

Dhara, Sumon ; Hota, Arpan ; Jain, Sachin ; Agarwal, Vivek (2021) A Transformerless 1-, 5-level Half-Bridge PV Inverter Configuration based on Switched-Capacitor Technique IEEE Transactions on Industry Applications . p. 1. ISSN 0093-9994

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Official URL: http://doi.org/10.1109/TIA.2021.3050975

Related URL: http://dx.doi.org/10.1109/TIA.2021.3050975

Abstract

Leakage current is a serious problem in the transformerless solar PV inverter configurations. The flow of leakage current is mainly due to the high-frequency oscillations in the voltage across PV parasitic capacitance (vCPV). Half-bridge and common ground type inverter topologies are highly suitable for eliminating these oscillations as these configurations allow direct electrical connection between the source and the load/grid ground. However, they suffer from either poor dc-bus utilization or asymmetric operation leading to dc-offset in the output voltage. In this paper, a novel 1-ϕ, 5-level inverter is proposed which employs a half-bridge structure to eliminate voltage oscillations from vCPV without compromising with the dc-bus utilization or symmetric operation. This is achieved by integrating a switched capacitor network with the half-bridge structure. All the necessary analysis and design procedures are included to support the various claims. The claims are further validated using MATLAB simulations and experiments on a laboratory prototype. The proposed topology is compared with the various existing topologies of similar nature (like 5-level output voltage, common ground or half-bridge type configuration and 1-ϕ) to prove its superiority.

Item Type:Article
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
Keywords:Leakage Current; Common Mode Voltage; Multilevel Inverter; Single Phase; Switched Capacitor.
ID Code:115050
Deposited On:16 Mar 2021 09:33
Last Modified:16 Mar 2021 09:33

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