Modeling and Analysis of a Six-Phase Self Excited Induction Generator Feeding Induction Motors

Conventionally, the multi-phase self-excited induction generators (SEIGs) have been analysed either with resistive or static resistive-inductive loads. This endeavor proposes a simple six-phase SEIG (6\phi-SEIG) topology feeding induction motors (IMs). Shunt and series capacitances provide excitatio...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2021-06, Vol.36 (2), p.746-754
Main Authors: Khan, M. Faisal, Khan, M. Rizwan
Format: Article
Language:English
Subjects:
Capacitance
Cross coupling
Dynamic loading
Electric potential
Excitation
induction generator
Induction generators
induction motor loads
Induction motors
Integrated circuit modeling
Load modeling
Loading
modeling
mult-phase
Reactive power
saturation
self-excited
Topology
Voltage
Voltage control
Windings
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Summary:Conventionally, the multi-phase self-excited induction generators (SEIGs) have been analysed either with resistive or static resistive-inductive loads. This endeavor proposes a simple six-phase SEIG (6\phi-SEIG) topology feeding induction motors (IMs). Shunt and series capacitances provide excitation current and load voltage compensation for 6\phi-SEIG. A stationary reference frame dual dq model including non-linear saturation and cross coupling effects is integrated with IM loads for simulating 6\phi-SEIG-IM set. Sub-synchronous resonance (SSR) is associated with series compensated SEIGs. A series capacitance 2.5 times the excitation capacitance causes SSR in studied 6\phi-SEIG as starting of IMs is attempted from its terminals. SSR induces low frequency oscillations and spikes load voltage and current amplitudes. A method to overcome SSR is proposed by evaluating a critical value of series capacitance (C_{se,cr}). Equipped with C_{se,cr} and excitation capacitance the 6\phi-SEIG successfully sustains starting, no-load build-up and rated load operation of IMs. A comparison with its equivalent 3\phi counterpart reveals that 6\phi-SEIG manages reactive power more efficiently as its optimum capacitance requirement reduces by 1.9 to 3.75 times, it incurs 0.4% to 2.8% lesser %THDs in output parameters and exhibits greater operational flexibility. Experimental results are obtained on an open end winding induction machine operated as SEIG.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2020.3013784