Journal ArticleDOI
A Current-Source Inverter in the Secondary Circuit of a Wound Rotor Induction Motor Provides Sub- and Supersynchronous Operation
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TLDR
A control system is described in which a current-source inverter is connected between the secondary winding of a three-phase slip-ring induction motor and the ac mains supply to give a variable speed sub- and supersynchronous operation.Abstract:
A control system is described in which a current-source inverter is connected between the secondary winding of a three-phase slip-ring induction motor and the ac mains supply to give a variable speed sub- and supersynchronous operation. Control techniques developed in an earlier work were used to ensure fully stable operation over a very wide speed range with either driving or braking torque. Means are provided for power-factor control to compensate for the lagging power-factor effect of the inverter when operating into the large secondary electromotive forces (EMF) at high slip values. Experimental results are presented for a speed range from standstill to approaching twice synchronous speed for both driving and braking torque. There are no instabilities and the developed torque even at low frequencies near synchronous speed is steady with motor derating due only to the quasi-square wave current in the secondary circuit.read more
Citations
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Proceedings ArticleDOI
Field orientation control of a doubly excited brushless reluctance machine
Longya Xu,Li Zhen,Eel-Hwan Kim +2 more
TL;DR: The concept and implementation of field orientation control of a doubly excited brushless reluctance machine (DEBRM) for variable speed drive and generating system are presented and computer simulation and laboratory experimental results are shown in excellent agreement.
Wind-energy recovery by a static Scherbius induction generator
G. A. Smith,K. A. Nigim +1 more
TL;DR: In this paper, a technique for controlling a doubly fed induction generator driven by a windmill, or other form of variable-speed prime mover, to provide power generation into the national grid system is described.
Wind-energy recovery by a static Scherbius induction generator
G. A. Smith,K. A. Nigim +1 more
TL;DR: In this article, a technique for controlling a doubly fed induction generator driven by a windmill, or other form of variable-speed prime mover, to provide power generation into the national grid system is described.
Journal ArticleDOI
Steady-state analysis of a doubly fed asynchronous machine supplied by a current-controlled cycloconvertor in the rotor
TL;DR: In this article, a doubly fed asynchronous machine (DFAM) with a current-controlled cycloconvertor (CCC) at the rotor and AC mains at the stator is investigated.
Journal ArticleDOI
A new slip power recovery scheme with improved supply power factor
TL;DR: In this paper, a slip power recovery scheme with a PWM (pulsewidth-modulation) converter in the rotor circuit is investigated, and the steady-state performance characteristics, such as speed-torque characteristics and the overall power factor of the drive system, are determined using simple DC and AC equivalent circuits.
References
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Journal ArticleDOI
Current-Source Converter for AC Motor Drives
TL;DR: In this paper, the employment of current-source concepts in thyristor converters to obtain adjustable frequency and adjustable current waveforms is presented. But the use of a dc filter choke and a current feedback loop to produce a regenerative current source is explained.
Journal ArticleDOI
Quasi-sine-wave fully regenerative invertor
W. Farrer,J.D. Miskin +1 more
TL;DR: In this paper, a cage induction motor is fed with a quasi-square-wave current, and the motor terminal voltage is approximately sinusoidal under normal operating conditions, based on the assumption that the motor resistances and inductances do not change with frequency.
Journal ArticleDOI
Slip Power Recovery in an Induction Motor by the Use of a Thyristor Inverter
William Shepherd,Jack Stanway +1 more
TL;DR: Line feedback with a two-phase induction motor eliminates the need for a variable control voltage source and improves the low power factor and nonsinusoidal supply current of the line feedback connection.
Journal ArticleDOI
Adjustable Speed AC Drive Systems for Pump and Compressor Applications
TL;DR: In this paper, the application and performance of a cycloconverter type frequency converter and a doubly fed wound rotor ac motor as applicable to adjustable speed drive systems for pump and compressor loads are discussed.