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Circuit arrangement of an inverted current rectifier with self commutation

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TLDR
Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutations in the phases are separated as discussed by the authors.
Abstract
Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutation in the phases are separated and the accumulated power of capacitors of the inverted rectifier is, without losses, discharged to the current source and thus to the load of the inverted rectifier.

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Citations
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Patent

Current-type GTO inverter with surge energy restoration

TL;DR: In this paper, a GTO bridge-connected inverter is used to generate commutation surge voltage from an inductive load whenever each GTO is turned off, and the surge voltage is stored in a capacitor (C 1 ) through a diode surge voltage rectifier (5) and then restored to the DC source terminals (3A, 3B) through a pair of other GTOs (G 7, G 8 ) turned on during steady state intervals of inverter commutation.
References
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Patent

A brushless dc motor system combined with a thyristor bridge inverter

TL;DR: In this article, a polyphase thyristor bridge inverter is used to energize the polyphase armature winding of an electric motor, which is subjected to either natural or forced commutation, the latter being more reliably than the former.
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TL;DR: In this paper, a solid state, current source, polyphase inverter induction motor drive is described, where the current source is derived from a constant potential buss each side of the buss is connected to the inverter via a separate chopper.