In transformerless photovoltaic (PV) systems, the leakage current reduction is one of the most important issues. Many interesting single-phase dc-bypass transformerless PV inverters have been proposed for the leakage current… Click to show full abstract
In transformerless photovoltaic (PV) systems, the leakage current reduction is one of the most important issues. Many interesting single-phase dc-bypass transformerless PV inverters have been proposed for the leakage current reduction, and there is a well-known conclusion that the clamping topology is better than the unclamping one in terms of leakage current reduction. However, is this conclusion correct for three-phase dc-bypass ones? The main objective of this article is to investigate the impact of clamping and unclamping dc-bypass switches on the leakage current reduction capability of three-phase transformerless inverters. The findings reveal that the conclusion is different from the single-phase dc-bypass ones. The theoretical analysis and experimental results are provided to verify the new insights.
               
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