Amit Kumar Jain

TL;DR: A novel, simple, and easily implementable sensorless control scheme based on a wound rotor induction machine with rotor side control to maintain constant voltage and frequency at the output of the generator irrespective of prime mover speed variation is proposed.

TL;DR: A simple active damping technique is proposed for lossless damping of vector-controlled ac motor drives with an LC filter and is carried out in the three-phase domain for better accuracy of the control.

TL;DR: This paper describes the field oriented control of a salient pole wound field synchronous machine in stator flux coordinates and proposes a new sensorless control by usingstator flux closed loop observer and estimation of torque angle using stator current components in statOr flux coordinates.

TL;DR: In this paper, an integrated starter generator (ISG) for automobile applications with 42-V powernet is described. This system is based on an induction machine which is directly mounted on the engine crankshaft and controlled using the technique of direct torque control (DTC).

Abstract: Neutral point clamped (NPC), three level converters with insulated gate bipolar transistor devices are very popular in medium voltage, high power applications. DC bus short circuit protection is usually done, using the sensed voltage across collector and emitter (i.e., VCE sensing), of all the devices in a leg. This feature is accommodated with the conventional gate drive circuits used in the two level converters. The similar gate drive circuit, when adopted for NPC three level converter protection, leads to false VCE fault signals for inner devices of the leg. The paper explains the detailed circuit behavior and reasons, which result in the occurrence of such false VCE fault signals. This paper also illustrates that such a phenomenon shows dependence on the power factor of the supplied three-phase load. Finally, experimental results are presented to support the analysis. It is shown that the problem can be avoided by blocking out the VCE sense fault signals of the inner devices of the leg.