BIDIRECTIONAL ELECTRIC POWER CONVERTER WITH FAULT-HANDLING CAPABILITY INCLUDING AN UNIPOLAR AND A BIPOLAR UNIT

摘要

A power conversion system (100) includes a unipolar bidirectional power converter (102) with DC terminals and a first controller (106), and a bipolar bidirectional power converter (104) with DC terminals connected in series with the DC terminals of the unipolar bidirectional power converter (102) and a second controller (108). The first controller (106) is operable to cause only a positive-valued DC voltage across the DC terminals of the unipolar bidirectional power converter (102). The second controller (108) is operable to cause a positive-valued or negative-valued DC voltage across the DC terminals of the bipolar bidirectional power converter (104) so that a total voltage of the power conversion system (100) is the sum of the positive-valued or negative-valued DC voltage across the DC terminals of the bipolar bidirectional power converter (104) and the positive-valued DC voltage across the DC terminals of the unipolar bidirectional power converter (102).