Reactive power allocation for loss minimisation in a stand alone variable speed constant frequency double output induction generator

Vector control algorithms reported so far for stand alone operation of variable speed constant frequency double output induction generators propose to supply the full magnetisation current of the machine in addition to the torque producing component from the rotor side converter. As the rotor of a n...

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Bibliographic Details
Published in:IET power electronics Vol. 6; no. 5; pp. 851 - 861
Main Authors: Bagarty, Durgesh Prasad, Kastha, Debaprasad
Format: Journal Article
Language:English
Published: Stevenage The Institution of Engineering and Technology 01.05.2013
The Institution of Engineering & Technology
Subjects:
Allocations
asynchronous generators
Electric potential
fast load transients
Flux
frequency control
full magnetisation current
improved stator flux oriented control strategy
load voltage
loss minimisation
machine loss
machine vector control
magnetisation current
magnetising current
normal induction machine
optimum allocation program
power convertors
Reactive power
reactive power allocation
rotor side
rotor side converter
Rotors
slow acting flux control loop
stand alone variable speed constant frequency double output induction generator
Stands
stator flux
stator side converter
stators
total reactive power demand
undesirable load voltage transients
Variable speed
variable structure systems
vector control algorithms
velocity control
Voltage
vector control algorithms
rotor side
fast load transients
machine loss
full magnetisation current
improved stator flux oriented control strategy
magnetising current
rotor side converter
magnetisation current
machine vector control
loss minimisation
slow acting flux control loop
power convertors
rotors
load voltage
undesirable load voltage transients
asynchronous generators
frequency control
normal induction machine
optimum allocation program
stators
velocity control
stator side converter
reactive power allocation
stand alone variable speed constant frequency double output induction generator
stator flux
variable structure systems
total reactive power demand
ISSN:1755-4535, 1755-4543
Online Access:Get full text
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Description
Summary:Vector control algorithms reported so far for stand alone operation of variable speed constant frequency double output induction generators propose to supply the full magnetisation current of the machine in addition to the torque producing component from the rotor side converter. As the rotor of a normal induction machine is not designed for this additional load this approach leads to underutilisation of the machine torque capacity. Moreover, supplying the entire magnetisation current from the rotor side is not optimal from the point of view of the machine losses. Since the load voltage is regulated by manipulating the magnetising current through a slow acting flux control loop undesirable fluctuations in the load voltage waveforms are observed during fast load transients. An improved stator flux oriented control strategy for this type of generators, proposed in this study, eliminates undesirable load voltage transients by directly regulating the stator flux through the stator side converter. The total reactive power demand of the system is dynamically distributed between the two converters according to an optimum allocation program so as to minimise the losses without disturbing the stator flux. The effectiveness of the proposed algorithms is verified experimentally on a laboratory prototype.
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ISSN:1755-4535
1755-4543
DOI:10.1049/iet-pel.2012.0561