Abstract
Transformerless grid-connected distributed photovoltaic (PV) systems (TGCDPVs) has the merits of high efficiency, small size, and low cost, draws great interest in recent years. However, Direct Current (DC) injection is a serious issue in TGCDPVS, which degrade its power quality. Some publications have discussed DC component generation and suppression methods; however, there are very few systematic reviews on the generation, detection, and suppression of DC component in TGCDPVS. For young researchers and designers working in photovoltaic power generation systems, the DC injection suppression is of great importance. This paper first reviews a number of issues related with dc component in TGCDPVs, the DC current generation and its detriments to the grid are reviewed at first, then, a comprehensive review on the latest DC detection method are performed, finally, various DC suppression solutions are given. Comparisons between various DC component detection and suppression methods are discussed. In the end, some future suggestions are given. This review shall provide a useful guideline and a clearer vision for researchers to determine the best solution for DC suppression in their PV product.
Highlights
With the gradual exhaustion of fossil energy in the world, energy shortage becomes a significant problem for countries in the world
Long et al.: Overview of direct current (DC) Component Generation, Detection, and Suppression for Grid-Connected Converter Systems many attempts have been presented on the usage of these resources [6], [7]
The advantages of this scheme are: firstly, the simplified power circuit and control circuit; secondly, much lower DC-link voltage is required than that in transformerless grid-connected converter for voltage matching at PCC
Summary
With the gradual exhaustion of fossil energy in the world, energy shortage becomes a significant problem for countries in the world. Grid connected converter plays an important role in the high-quality energy conversion in distributed generation system DGs. There are two schemes for grid-connected converter in the distributed power generation system, namely, isolation and non-isolation power converters. The isolation transformer means that no direct current (DC) is injected to the grid. The advantages of this scheme are: firstly, the simplified power circuit and control circuit; secondly, much lower DC-link voltage is required than that in transformerless grid-connected converter for voltage matching at PCC. To solve the above issues, the TGCDPVS draws great interests in recent years
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