Steady-state performance of self-excited reluctance generators

Mohamadein, A.L.; Rahim, Y.H.A.; Al-Khalaf, AlBatool

doi:10.1049/ip-b.1990.0035

Cited by 50 publications

(11 citation statements)

References 10 publications

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“…In addition, the rotor cage is short circuited by end rings, and hence, the voltages V 0 qr and V 0 d r are zero. Other authors [3,8] used a similar procedure and arrived at equations for the load angle and daxis magnetizing inductance in terms of machine parameters, terminal load, and exciting capacitor. Such studies linearized the relationship between the d -axis inductance and winding current and assumed that the q-axis inductance is constant.…”

Section: Load Characteristicsmentioning

confidence: 98%

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Influence of Rotor Cage on the Performance of a Synchronous Reluctance Generator

Emeka

Anih

2010

Electric Power Components and Systems

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The influence of rotor cage on the performance of an autonomous selfexcited reluctance generator supplying loads of different power factors is presented. It is seen that for the same excitation capacitance, terminal load connection, and speed, the self-excited reluctance generator with a cage exhibits a better ability to preserve the voltage waveshape following a sudden addition or removal of load than does a cageless self-excited reluctance generator. This is because during the transient disturbance, the rotor cage supports some DC current in the d -axis, making it act as a field winding. The solution of steady-state model equations formulated directly from the dynamic model are solved using the MATLAB ® (The MathWorks, Natick, Massachusetts, USA) optimization technique 'fsolve.' The cageless self-excited reluctance generator is only capable of yielding less than half the rated power, while the self-excited reluctance generator with a cage is able to produce more than twothirds of the rated power. This is due to the inability of the cageless machine to excite at capacitance values high enough to circulate the rated current in the machine windings.

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Section: Load Characteristicsmentioning

confidence: 98%

“…The onset of steady-state analysis of synchronous reluctance machines from d -q models assumes that all time-varying state variables are zero [3,8]. In addition, the rotor cage is short circuited by end rings, and hence, the voltages V 0 qr and V 0 d r are zero.…”

Section: Load Characteristicsmentioning

confidence: 99%

Influence of Rotor Cage on the Performance of a Synchronous Reluctance Generator

Emeka

Anih

2010

Electric Power Components and Systems

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“…Later in the early sixties and seventies, synchronous reluctance machines were extensively investigated as line-start synchronous machines and during the period other rotor designs and applications emerged [2].Since then, many researchers have worked on the analysis of its performance as a motor and compared with that of the induction machine. Mohamadein [3] proposed a model for a self-excited reluctance and this was done to overcome the disadvantages of induction generator. While Brennen [4] carried out a study on the steady-state characteristics of synchronous reluctance generator (with two different rotor structures) and compared with those of the induction generator.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Self-Excited Cage and Cageless Three Phase Synchronous Reluctance Generator

Ojo¹

2017

IJERA

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The concept of generating electrical power using reluctance generator is yet to be fully exploited, which will necessitate its development into industrial standard. This research aims to facilitate the development through a comparative evaluation of the performance of caged and cageless reluctance generators. A three-phase synchronous reluctance generator was modeled using existing information and its performance with or without a cage rotor was analyzed. Evaluation of the machines' performance was carried out at both steady and dynamic states using MATLAB. The results show that a self-excited cage rotor synchronous reluctance generator yielded a power of 0.25 p.u compared to the cage-less rotor that yielded 0.2 p.u at an excitation of 62 μF; while on further excitation using capacitance of 110µF, the cage rotor yielded a higher power of 0.9p.u whereas the cageless rotor could not excite beyond 62 μF. This implies that the cage rotor generator has the ability to excite at capacitance values high enough to circulate rotor current in the machine windings due to the existence of remnant flux, magnetic saturation and rotor geometry. The removal of damper cage of a synchronous reluctance machine allows for more modifications of the rotor geometry which include reduction in the quadrature axis flux path and hence the quadrature axis reactance which ultimately improves the machine performance. This shows that a cage rotor generator can be deployed where higher power is required.

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“…This results in an additional increase in the stator induced voltage. The increase in both excitation current and induced stator voltage continues until steady-state condition occurs due to inherent machine magnetic saturation [10,17].…”

Section: Proposed Self-excited Wind Generating Systemmentioning

confidence: 99%

“…Some studies discussed the performance characteristics and steady-state analysis of synchronous reluctance generators [10][11][12]. In addition, a little work has been presented on the transient analysis of this generator type [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of an isolated self-excited synchronous reluctance generator driven by a wind turbine

Ali¹,

Allam²,

Abdel-Moneim³

2016

Turk J Elec Eng & Comp Sci

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This paper studies the dynamic characteristics of an isolated three-phase self-excited synchronous reluctance generator (SESRG) driven by a variable-speed wind turbine under different operating conditions. Self-excitation is achieved via capacitors connected across the generator terminals. A detailed mathematical modeling of the proposed self-excited wind generation system is presented. The proposed analysis is based on the dynamic qd-axis model of the SESRG. Magnetic saturation is taken into account and is assumed to be confined to the direct axis and is accounted for as a variable direct-axis magnetizing reactance. Effect of wind-speed variation, excitation-capacitance variation, and loading-conditions variation on the generated output voltage and frequency are presented and discussed. The presented results show the effectiveness of the proposed wind-generation system. A close agreement between experimental and simulated results has been observed, which supports the validity of the proposed analysis.

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Steady-state performance of self-excited reluctance generators

Cited by 50 publications

References 10 publications

Influence of Rotor Cage on the Performance of a Synchronous Reluctance Generator

Influence of Rotor Cage on the Performance of a Synchronous Reluctance Generator

Performance Evaluation of Self-Excited Cage and Cageless Three Phase Synchronous Reluctance Generator

Dynamic characteristics of an isolated self-excited synchronous reluctance generator driven by a wind turbine

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