Method and system for terminating operation of an HVDC invertor

Details Method and system for terminating operation of an HVDC invertor Method and system for terminating operation of an HVDC invertor

1984-02-24

1985-09-24

Beha, Jr., William H.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Plural converters

307 86, 363 35, 363 51, H02J 336

Patent

active

045434921

ABSTRACT:
In a method and a system for terminating inverter operation of a converting device connected to a DC power transmission system and having a bridge connection 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 condition for effecting termination of the inverter operation. 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.

REFERENCES:
patent: 3543045 (1970-11-01), Hammarlund et al.
patent: 3737763 (1973-06-01), Chadwick
patent: 3881147 (1975-04-01), Ueda et al.
patent: 3883791 (1975-05-01), Zelina et al.
patent: 4419591 (1983-12-01), Irokawa et al.

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