STEREOSCOPIC DC-DC CONVERTER AND GRID INTERCONNECTOR

摘要

The present invention discloses a stereoscopic DC-DC converter for power transfer between two DC grids, the converter comprises a first converter, a second converter and a third converter, a positive terminal of the first converter is connected to a positive terminal of a second DC grid, a negative terminal of the first converter is connected to a positive terminal of the second converter, a negative terminal of the second converter is connected to a positive terminal of the third converter, a negative terminal of the third converter is connected to a negative terminal of the second DC grid, in the meantime, a positive terminal of the second converter is also connected to a positive terminal of a first DC grid, and the negative terminal of the second converter is also connected to a negative terminal of the first DC grid. Compared with the conventional DC-DC converter employing the DC-AC-DC converting technology, the DC-DC converter of the invention makes full use of existing DC voltage of the first DC grid, which significantly reduces overall power of converters that are used, and thus cost and power loss caused thereby.

主权项

1. A stereoscopic DC-DC converter for power transfer between a first DC grid (8) and a second DC grid (9), comprising a first converter (1), a second converter (2), and a third converter (3), wherein:
a positive terminal of said first converter (1) is connected to a positive terminal of said second DC grid (9); a negative terminal of said first converter (1) is connected to a positive terminal of said second converter (2); a negative terminal of said second converter (2) is connected to a positive terminal of said third converter (3); a negative terminal of said third converter (3) is connected to a negative terminal of said second DC grid (9); a positive terminal of said second converter (2) is connected to a positive terminal of said first DC grid (8); and said negative terminal of said second converter (2) is connected to a negative terminal of the first DC grid (8).