Effect of excitation capacitors on transient performance of reluctance generators

Rahim, Y.H.A.; Alyan, M.A.A.S.

doi:10.1109/60.103646

Cited by 12 publications

(9 citation statements)

References 11 publications

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“…In addition, a little work has been presented on the transient analysis of this generator type [13][14][15]. On the other hand, the performance analysis of SESRGs when driven by a wind turbine has not gained significant attention from researchers to date [6,16].…”

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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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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“…Most of the papers in this area concern with the steady state performance, its load and excitation capacitance effect on terminal voltage, power factor, and stability [7] [8][9][10][11]. Others focus on its self-excitation and de-excitation process to predict the transient.…”

Section: Equivalent Circuit Modelingmentioning

confidence: 99%

“…So finally, equation (2-1) to equation (2)(3)(4)(5)(6)(7) are used to solve the transient response. The saturation curves can be obtained by measurement or by finite element method.…”

Section: System Model Under Abc Natural Frame For Resistive Loadmentioning

confidence: 99%

“…Therefore, a change of the variables which formulates a transformation from one stationary two phase system to another rotor reference frame can be defined as: (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) where f can represent voltage, current or flux linkage.…”

Section: System Model Under Qd Reference Frame For Resistive Loadmentioning

confidence: 99%

“…The stator equations in QD reference frame are exactly the same as equations (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) and (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) shown in Section 2.2.…”

Section: System Model Under Qd Reference Frame For Rl Loadmentioning

confidence: 99%

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Nonlinear transient and steady state analysis for self-excited single-phase synchronous reluctance generator

Chen¹

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Nonlinear Transient and Steady State Analysis for Self-excited Single-phase Synchronous Reluctance Generator By Jingdong chen With today's trend for distributed generation and the need for alternative and renewable energy sources, self-excited induction and synchronous reluctance generators have attracted more attention for wind, tidal and hydro power generation applications. Compared to synchronous and DC generators, they have the advantages: they are brushless, they are robust, they do not need DC excitation and they are relatively low cost. Compared with SEIG, the self-excited reluctance generator (SERG) not only has the advantages of simplicity and ruggedness, but can also have enhanced steady-state characteristics and high efficiency over a wide range of operation. Moreover, its output frequency is determined only by the prime mover speed, rather than by both the load and the prime mover speed as in an induction generator, so SERG can be easily integrated with power electronic devices to implement a control scheme. Most of the current analyses deal with three-phase reluctance generators, but insufficient attention has been paid to single-phase self-excited reluctance generators (SPSERG). Their unbalanced loads make their analysis more difficult. This research is motivated by the fact that SPSERG provides a good alternative to single-phase induction generators used in stand-alone generation applications. A general methodology is suggested for transient response prediction and steady state performance analysis for the SPSERG type of electric machine. To establish a design environment, finite element method is an effective tool, which can be integrated in machine modeling to obtain good performance prediction. In this work, an off-line FEM approach is proposed to obtain the saturation characteristics for state space simulation. During the process, transformation between instantaneous inductance and average inductance is investigated. Off-line FEM+SS approach is proved to be a simple and economic method and can fit the experimental results in good accuracy. Moreover, a steady state model has to be built to reveal the parametric dependence and provide good design guidance. However, because of the unbalanced load and nonlinear feature of the machine, existing models are not suitable for analysis. In this dissertation, a novel inductance-oriented steady state model based on the harmonic balance technique is introduced. The idea is that starting from the inductance determination under certain load, the fluxes can be attained by a nonlinear relationship, after that, the machine variables can be solved according to the fluxes. Comparison between simulation and experiment validates this approach. iii Acknowledgement I would first like to thank my advisor and academic committee chairman, Dr.

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Transient simulation technique for studies of self-excited generator systems

Liu

Chang

1995

Electric Power Systems Research

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Effect of excitation capacitors on transient performance of reluctance generators

Cited by 12 publications

References 11 publications

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

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

Nonlinear transient and steady state analysis for self-excited single-phase synchronous reluctance generator

Transient simulation technique for studies of self-excited generator systems

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