L3_1 - Dual-Converter A three-phase bridge rectifier...

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Dual-Converter A three-phase bridge rectifier provides unidirectional current at the dc terminals, but the voltage of the dc terminals can be reversed. It is thus capable of providing only two-quadrant operation. If two full-converters are connected back-to-back, both the voltage and the current at the dc terminals can reverse, and system will provide four-quadrant operation. 1 2 3 4 n T Motoring Clockwise Motoring counterclockwise Generating Clockwise Generating Counterclockwise n T This system is normally used for high-power dc drives, with power levels in the megawatt range, for speed control in both directions. 1
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IDEAL DUAL-CONVERTER Assume that the converters are ideal and that they produce pure dc output voltage, that is, no ac ripple at dc output terminals. Thus, both converters produce the same terminal voltage, one converter operating as a rectifier and the other operating as an inverter. Therefore, 11 0.955 cos dm l VV α = 22 0.955 cos l = In an ideal dual-converter, 12 dd d V = =− 0.955 cos 0.955 cos ml ml = − cos cos 0 + = 0 180 αα += 2
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Firing Control Scheme 3
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cos A eK t ω = , cos A eKt ′ = − 1 cos C EK α = , 2 cos C = − 1 cos C E K = , 2 cos C E K =− 11 0.955 cos 0.955 C dm l m l E VV V K == , 22 0.955 cos 0.955 C l m l E V K 12 0.955 m dd d V V E
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This note was uploaded on 10/05/2011 for the course EECS 101 taught by Professor Hero during the Spring '11 term at National Taipei University.

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L3_1 - Dual-Converter A three-phase bridge rectifier...

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