Method of controlling a power conversion system

Details Method of controlling a power conversion system Method of controlling a power conversion system

1978-04-10

1979-05-29

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 96, 363129, H02P 1324, H02M 7155

Patent

active

041568966

ABSTRACT:
A method of controlling the thyristors of an a.c. to d.c. bridge converter, having neutral connected thyristors, at relatively low power levels by gating each phase leg thyristor conductive for a predetermined minimum period within the electrical separation between adjacent line to neutral phase voltages and immediately gating the respective neutral leg thyristor conductive for the remainder of the period such that there are no intervals in the cycle when both neutral leg thyristors are in conduction. In a three phase bridge converter system, this requires at least 60 electrical degrees minimum conduction for each phase leg thyristor followed by a 60.degree. conduction of the neutral leg thyristors. In any event, the sum of the phase leg conduction and the neutral leg conductions is always equal to 120.degree. in a three phase system. This control method improves the response to a reverse command voltage by assuring that a phase leg thyristor is conductive, thus making a transition from the first to fourth quadrant operation at maximum possible speed.

REFERENCES:
patent: 3392319 (1968-07-01), McColl et al.
patent: 3421071 (1969-01-01), Cassel
patent: 3424970 (1969-01-01), Ross
patent: 3447061 (1969-05-01), Russell et al.
patent: 3775663 (1973-11-01), Turnbull

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