Electric power conversion system and electric power conversion method for stopping power upon a failure

摘要

An electric power conversion system includes: a primary circuit including a first port, a second port and a primary electric power conversion unit; and a secondary circuit magnetically coupled to the primary circuit by a transformer and including a third port, a fourth port and a secondary electric power conversion unit. The electric power conversion system is configured to convert electric power between any two of the four ports with the use of the primary and secondary electric power conversion units, and convert electric power between the first and second ports and between the third and fourth ports with the use of electric power conversion circuit portions other than a faulty electric power conversion circuit portion among a plurality of electric power conversion circuit portions configured in the primary and secondary electric power conversion units.

主权项

1. An electric power conversion method comprising:
among four ports including a first port and a second port of a primary circuit and a third port and a fourth port of a secondary circuit magnetically coupled to the primary circuit by a transformer, converting electric power between any two of the four ports with the use of a primary electric power conversion unit configured in the primary circuit and a secondary electric power conversion unit configured in the secondary circuit; and when there occurs a failure in any one of a plurality of electric power conversion circuit portions configured in the primary and secondary electric power conversion units, converting electric power between the first port and the second port and between the third port and the fourth port with the use of the electric power conversion circuit portions other than the faulty electric power conversion circuit portion among the plurality of electric power conversion circuit portions, wherein the primary electric power conversion unit and the secondary electric power conversion unit are configured to stop transfer of electric power between the primary circuit and the secondary circuit when there is a failure in at least one of the primary electric power conversion unit and the secondary electric power conversion unit, and stopping transfer of electric power by disconnecting magnetic coupling between the primary circuit and the secondary circuit when there is the failure by short-circuiting both ends of each of coils formed in the transformer.