Abstract
In this article, a novel single-stage transformerless buck–boost inverter is introduced. The proposed inverter can share a common ground between the DC input side and the grid; this leads to having a zero-leakage current. The proposed inverter also provides the buck and boost voltage capabilities. Additionally, the power switches are operated at high frequency in the half-cycle of the sinusoidal wave, so the efficiency of the proposed inverter can be improved. Operating analysis, design consideration, comparison, and simulation study are presented. Finally, a 500 W laboratory prototype is also built to confirm the correctness and feasibility of the proposed inverter.
Highlights
In recent years, the nearly exhausted fossil fuels and environmental deterioration have promoted the development of renewable energy sources such as wind power, photovoltaic (PV), fuel cells, and ocean waves [1–4]
This leakage current causes a rise in harmonic distortion, in both output voltage and current, which results in electromagnetic interference between the PV system and grid
It can be seen that the proposed common-ground transformerless buck–boost inverter (CGBBI) topology is composed of one buck–boost module, one boost module, and one power switch operating at low frequency
Summary
The nearly exhausted fossil fuels and environmental deterioration have promoted the development of renewable energy sources such as wind power, photovoltaic (PV), fuel cells, and ocean waves [1–4]. Two-stage transformerless inverter topologies can have some disadvantages, including low efficiency, increased cost, and complexity control in a two-stage configuration. In order to improve the boosting capability and provide common ground with singlestage configuration, single-stage, common-ground transformerless inverters have been used in [23] without a continuous input current. To further improve the voltage gain, a novel step-up transformerless inverter is presented in [27] This inverter can provide the common ground between the output and input sides with a single stage. It requires more switches, which increases the size and cost of the inverter package. A novel single-stage common-ground transformerless buck–boost inverter (CGBBI) is proposed to eliminate leakage current elimination and achieve voltage boosting capability.
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