Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1978-02-21
1979-12-04
Miller, J. D.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 37, H02J 326
Patent
active
041775082
ABSTRACT:
Apparatus for use in balancing an asymmetrical load which is supplied from a three-phase network. The apparatus is provided with a self commutating converter for generating a three-phase output current system on its a-c side which is fed with phases reversed to the network. The d-c side of the converter, in turn, is fed from a d-c source with a d-c current corresponding to the maximum asymmetry power to be balanced. The apparatus is further provided with a control device which includes a first control means having a pulse program for firing and extinguishing the valves of the converter; and a second control means responsive to the a-c voltage and a-c current of the three-phase network for determining the phase and amplitude of the required countercurrent system and for controlling the pulse widths of the pulses of the program of the first control means to effect a change in the amplitude of the fundamental of the converter three phase output current system in dependence on the determined amplitude of said counter current system and for controlling the phase of the pulse program relative to the zero crossings of the a-c voltage of the network to effect a change in the phase of the fundamental of the three phase output current system in dependence on the determined phase of the countercurrent system.
REFERENCES:
patent: 3551778 (1968-11-01), Ekstrom
patent: 3768001 (1973-10-01), Thorborg
patent: 3980941 (1976-09-01), Griebel
Miller J. D.
Siemens Aktiengesellschaft
Wong Peter S.
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