DC Bias in Distributed Photovoltaic Grid Power Transformers
8.1 DC Injection into the Grid
Many DC-AC inverters employ transformers in their overall design, thus eliminating the DC bias that can be injected into the grid. Distributed photovoltaic grid transformers (DPV-GTs) play an important role in performing this basic function. However, many commercial inverters are designed without transformers for higher efficiency, lower cost, and size limitations. In such cases a better approach is to design a filter to remove the DC bias.
DC injection into the grid results from badly designed grid-connected inverters. Transformers and inverters can be specially designed to eliminate DC injection into the AC grid. High DC injection causing possible ...
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