Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1984-04-05
1986-02-18
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
318345C, 363 87, H02H 7162
Patent
active
045716684
ABSTRACT:
A control apparatus for a thyristor converter which supplies electric power to a load generating a changeable electromotive force, wherein, in response to a load current being changed from an intermittent load current mode to a continuous load current mode, an actual main circuit constant of the load is calculated on the basis of a pregiven main circuit constant of said load, a predetermined minimum value of a DC average motor current at which a compensation control angle is zero, a DC average load current and a set control angle at a time when the load current just changed from the intermittent load current mode to the continuous load current mode.
The compensation control angle is obtained on the basis of the calculated actual main circuit constant and the DC average load current.
The calculated compensation control angle is added to the set control angle to thereby apply the added angle to the thyristor converter as a firing control angle.
REFERENCES:
patent: 3902109 (1975-08-01), Speth et al.
patent: 3976930 (1976-08-01), Rehnman
patent: 4490780 (1984-12-01), Nondahl
patent: 4507723 (1985-03-01), Brackman et al.
Azusawa Noboru
Shiraishi Hisayoshi
Beha Jr. William H.
Hitachi , Ltd.
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