Multi-phase rectifier system

Electrical transmission or interconnection systems – Plural supply circuits or sources – Plural converters

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Details

307 43, 307 83, 321 27R, 321 43, H02J 338

Patent

active

039743977

ABSTRACT:
Disclosed is a multi-source rectifier system for providing DC power to a load from a plurality of high impedance AC electrical sources connected to a multi-source high voltage transmission system. The system comprises a parallel arrangement of high impedance AC current sources each connected in series with a respective bridge rectifier, the positive output terminals of all bridge rectifiers are connected in parallel to the positive side of a load. The negative output terminals of all bridge rectifiers are connected in parallel to the low side of the load. The individual high impedance AC current sources are completely isolated from one another through their series connected bridge rectifiers, making it possible to simultaneously supply current from more than one high impedance AC current source to the load without significant circulating currents among the sources. The parallel arrangement of high impedance AC current sources connected through bridge rectifiers to the load provides direct current electrical power to the load notwithstanding phase differences between various high impedance AC current sources. A multisource rectifier arrangement when connected to a high impedance AC current source, will yield a level of DC output power greater than what at first might be expected. Only one rectifier may conduct at any given time when voltage sources are used and when the load is resistive, for example, the rectifier conduction angle cannot exceed 120.degree. (60.degree. per half cycle). This is the result of forced commutation of the rectifier by the voltage source. When a current source, e.g. a high impedance AC current source, is used however, the conduction angle with a resistive load, for example, can increase theoretically to 360.degree. (180.degree. per half cycle) and several rectifiers can conduct simultaneously. Further, the failure of any number fewer than all of the high impedance AC current sources will not interrupt power to the load.

REFERENCES:
patent: 2759140 (1956-08-01), Lewis
patent: 3535603 (1970-10-01), Droste et al.

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