FIELD: electricity.
SUBSTANCE: scalar control method consists in pulse-duration control of three-phase voltage by means of fourfold alternating switching of valves at the period of carrier frequency only in two load phases, while in the third phase the valve remains ON throughout the repetition interval equal to 1/6 of period of output voltage. Switchings are performed at moments of equality of reference and three-phase modulating signals. The latter is obtained by multiplying the three-phase demand signal of harmonic shape by switching function, each phase of which is formed with alternation of various clock pulses of carrier frequency of unit amplitude, which divide the period of demand signal into six equal time intervals.
EFFECT: reducing commutation power losses and increasing maximum value of output voltage of amplitude of line-to-earth voltage of the network.
6 dwg
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