Method and system for terminating operation of an HVDC invertor
First Claim
1. A method for terminating inverter operation of a converting device connected to a DC power transmission system and having a bridge connection of thyristor valves, comprising the steps of:
- detecting absence of a current flowing through the converting device to provide an absence detection signal indicative of such absence, andusing said absence detection signal as one condition for effecting termination of the inverter operation,wherein said step of detecting absence comprises detecting non-conduction of all the valves in at least one of the lower potential side and the higher potential side to find said absence of a current when said all the valves are found concurrently non-conducting, andthe detection of non-conduction of each valve comprises detecting a voltage across the valve to find the non-conduction when the voltage is found present.
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Accused Products
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.
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Citations
10 Claims
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1. A method for terminating inverter operation of a converting device connected to a DC power transmission system and having a bridge connection of thyristor valves, comprising the steps of:
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detecting absence of a current flowing through the converting device to provide an absence detection signal indicative of such absence, and using said absence detection signal as one condition for effecting termination of the inverter operation, wherein said step of detecting absence comprises detecting non-conduction of all the valves in at least one of the lower potential side and the higher potential side to find said absence of a current when said all the valves are found concurrently non-conducting, and the detection of non-conduction of each valve comprises detecting a voltage across the valve to find the non-conduction when the voltage is found present. - View Dependent Claims (2, 3, 4)
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5. 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, comprising:
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means for detecting absence of a current flowing through the converting device to produce an absence detection signal indicative of such absence, means using said absence detection signal as one condition for effecting termination of the inverter operation, wherein said means for detecting absence comprises means for detecting non-conduction of all the valves in at least one of the lower potential side and the higher potential side to find said absence of a current when said all the valves are found concurrently non-conducting, and said means for detecting non-conduction comprises means for detecting a voltage across each valve to find the non-conduction when the voltage is found present. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification