| 摘要 |
PROBLEM TO BE SOLVED: To prevent commutation failure of an AC-DC converter and to make it possible to stably continue the operation switching a synchronous power source according to the same command as that of switching of a system bus to synchronously detect and control the AC-DC converter during operating, thereby switching the bus without having to stop power transmission between the systems. SOLUTION: When an AC-DC converter 1A transmits power by a DC linkage during operating, the switch command of a system bus switch operation unit 33A is given to disconnectors 60A, 62A connected with a dual system bus 10A. Thus, the disconnectors 60A, 62A are disconnected, disconnectors 61A, 63A are connected, and the system bus 10A is switched to a dual system bus 10A'. The same signal as that of this system bus switch operation command is transmitted to a synchronous power source switch circuit 81A in a converter controller 200A, and the synchronous power detected by an AC power source detector 50A is switched to the synchronous power source detected by an AC power source detector 50A'. Thus, the occurrence of the commutation failure of the converter 1A can be prevented. |
