Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1996-09-11
1998-02-03
Hecker, Stuart N.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 35, H02H 7125, H02J 336
Patent
active
057151512
ABSTRACT:
A control and protection system for an AC-DC conversion system for exchanging an electric power between two AC power systems. The AC-DC conversion system is composed of two power converters and two circuit breakers connected to the two AC power systems. Each of the power converters is composed of a plurality of switching devices controlled by a gate signal and converts AC power into DC power or DC power into AC power. The control and protection system is composed of two control and protection units. Each of the control and protection units includes a protection unit for detecting a fault of the power converter to generate a first protection order signal when the fault is detected, and a phase control unit for continuously generating firing pulses to the switching devices of the power converter. Each of the control and protection unit further includes a protection sequence unit connected to the protection unit for receiving the first protection order signal, for holding the first protection order signal, for generating an opening instruction to the circuit breaker, and for generating a second protection order signal for stopping the power converter at another side to the control and protection unit at the another side, while the firing pulses are being supplied to the switching devices of the power converter.
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Handbook for High Voltage Direct Current Technology, Chapter 5, Sec. 5, A Classification of HTDC Faults and Protection Sequence, JIEE, Mar. 30, 1978.
T. Machida, "High Voltage Direct Current", Chapter 6, Sec. 4, Example of Protection Sequences, Feb. 15, 1971.
Hecker Stuart N.
Kabushiki Kaisha Toshiba
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