Method and apparatus for determining the actual value of the mar

Details Method and apparatus for determining the actual value of the mar Method and apparatus for determining the actual value of the mar

1988-09-23

1989-12-12

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 35, 363 51, 363129, H02M 1084

Patent

active

048872008

ABSTRACT:
A method and apparatus for determining the quenching angle in inverter valves, in which the pulse-shaped deviations, which occur in the valve voltages due to the current commutations as compared to the corresponding fundamental waveforms, are blanked out in the form of voltage blocks. For the duration of the quenching angle, a binary measuring signal is generated which is triggered by an end-of-conduction pulse and is terminated by a zero voltage crossing pulse. The end-of-conduction pulse indicating the completion of the commutation is formed by the flank at the end of the voltage shift caused by the preceeding commutation in the valve voltage as compared to the fundamental waveforms.

REFERENCES:
patent: 3771041 (1973-11-01), Chadwick
patent: 4554623 (1985-11-01), Ainsworth
Galanos et al, "Direct Digital Control of HVDC Converter," IEEE Trans. on Pwr. App. and Syst's., vol. PAS-89, No. 8, Nov./Dec. 1970, pp. 2056-2065.
"Elektrotechnische Zeitschrift ETZ," vol. 102 (1981) pp. 14-18 (1981).
"Voltage Circuit for an HVDC Convertor" O'Kelly, IEEE Proceedings, vol. 131, pp. 5-15 (1984).
"Microprocessor-Controlled HVDC Simulator", J. A. Arrillaga et al., IEEE Proceedings, vol. 131, pp. 197-203 (1984).

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