A new slip power recovery scheme with improved supply power factor

Dept. of Electr. Eng., Indian Inst. of Technol., Kanpur
IEEE Transactions on Power Electronics (Impact Factor: 6.01). 05/1988; 3(2):200 - 207. DOI: 10.1109/63.4350
Source: IEEE Xplore


A slip power recovery scheme with a PWM (pulsewidth-modulation)
converter in the rotor circuit is investigated. 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. The performance characteristics
are verified experimentally, showing good agreement with theoretical
results. The power factor of the drive system is improved significantly
over the entire range of speed control. The drive provides speed-torque
characteristics similar to those of a separately excited DC motor.
Oscillograms of typical waveforms from the experimental set-up are
illustrated to demonstrate the satisfactory performance of the scheme

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    • "Two voltage fed PWM converters are inserted back-toback in the rotor circuit, which connect the slip ring terminals to the ac supply network. By adjustment of the switching of the Insulated Gate Bipolar Transistors in both converters, the power flow between the rotor circuit and the supply can be controlled both in magnitude and in direction [8], [9], [13]. This is effectively the same as connecting a controllable voltage source to the rotor circuit [16]. "
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    ABSTRACT: A method of evaluating harmonic currents and voltages associated with slip power recovery drives is presented. The rectifier commutation overlap and DC link current ripple are included in the analysis by using a hybrid between the traditional d - q and a - b - c induction motor models. The harmonic components are determined from closed-form expressions which are functions of the numerical values of the distorted waveforms. Computer simulations illustrate the nonperiodic nature of the stator currents and typical harmonic contents of rotor phase current and voltage as well as inverter current at various speed values
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