Method and system for terminating inverter operation of a...

Details Method and system for terminating inverter operation of a... Method and system for terminating inverter operation of a...

H - Electricity

02

M

321/24

H02M 5/257 (2006.01) H02H 7/12 (2006.01) H02M 7/155 (2006.01) H02M 7/525 (2006.01) H02M 7/757 (2006.01)

Patent

CA 1201476

ABSTRACT OF THE DISCLOSURE In a method and a system for terminating invert- er operation of a converting device connected to a DC power transmission system and having a bridge connec- tion of thyristor valves, absence of a current flowing through the converting device is detected to provide an absence detection signal indicative of such absence, and the absence detection signal is used as one condi- tion for effecting termination of the inverter opera- tion. According to the invention, the absence is found when all the valves in at least one of the lower potential side and the higher potential side are found concurrently non-conducting, and each valve is found non-conducting when a voltage is found present across each valve.

447736

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