Steady State Analysis of Capacitor Self-Excited Induction Generators
ABSTRACT The paper presents a method for the steady state analysis of self-excited induction generators using balanced terminal capacitors. Operational and steady state equivalent circuits of the induction machine are employed to predict the steady state performance under different load conditions. The analytical procedure and the related computer program is described in the paper. Simulated results are presented and compared with corresponding results obtained experimentally.
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- "By using SEIG, it comes with small size and weight, simple construction, the absence of separate source for excitation, cheap and low cost compared to a synchronous induction machine. Certain minimum value need to be added in the terminal capacitance in SEIG so that self-excitation can take place where this value is affected by the machine parameters, speed and also load condition  . "
Conference Paper: Flywheel Energy Storage for Wind Energy System with SEIG-Motor Set[Show abstract] [Hide abstract]
ABSTRACT: Keywords: Flywheel energy storage system (FESS), wind energy system, self-excited induction motor (SEIG). Abstract. Intermittent wind energy in producing optimal power flow could lead to unstable generated power. Due to this, an energy storage that can release and absorb energy need to be used in order maintains the generated voltage at the permitted quality for the load. Nowadays, tons of energy storage systems are used in storing the energy. Flywheel energy storage system (FESS) becomes one of potential mechanism that can be used to smooth the voltage output of wind turbine due to its advantages. The aim of this study is to design and implement a FESS for critical load in a wind energy system that can store energy for a short time period. Then, period of the voltage generated by FESS using different capacitance is analyzed. FESS consists of a self-excited capacitance induction motor-generator set (SEIG), controller circuit and flywheel rotor. In this study, a three phase asynchronous induction machine is used as a motor-generator due to its simplicity, cheap, robust and less maintenance. The flywheel and SEIG-motor set could store the energy for a short period of time, which can be used to compensate for wind instability. Results show that FESS generates variable powers that compensate short time power to the wind system.ICEPEA 2014 Papers\full paper icepea2014; 11/2014
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- "The most typical analytical approach is based on the steady-state per-phase equivalent circuit of the induction machine. A necessary condition for the existence of a nonzero operating point is obtained by equating to zero either the total loop impedance - or the total node admittance at the magnetizing branch -. For resistive-inductive loads, selfexcitation conditions and steady-state values have been obtained by solving iteratively or numerically systems of two polynomial equations giving the frequency, and either the mutual inductance or the capacitance -. "
ABSTRACT: The paper presents a detailed analysis of self-excited induction generators with resistive-inductive loads. A nonlinear dynamic model is derived that enables a unified analysis of both the steady-state and transient characteristics of the machine. Steady-state operating modes are first determined, and self-excitation boundaries are derived. Computations are straightforward and do not require iterations. The dynamic model is also used to compute the eigenvalues of the linearized system around an operating mode. Experimental data show good agreement with computational results using the dynamic model. It is found that the addition of inductance generally, but not necessarily, enlarges the set of conditions where self-excitation is possible, and increases the stability of the operating modes.SPEEDAM 2014; 07/2014
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- "The impedance model  and the admittance model  are largely used for steady state analysis of SEIGs. Another approach introduces operational circuit based analysis  wherein the frequency f in the model is replaced by a new operator in terms of time derivative of ω i.e, the angular velocity. "
ABSTRACT: Renewable energy generation has emerged as a thrust area in energy technologies in the recent times. Amongst various generation systems based on renewable sources, wind electricity generation has proved to be most beneficial. One of the most important aspects for such applications is choice of generator. The self excited induction generators (SEIGs) are considered to be most suitable generating devices for wind and mini/micro hydro generation due to their rugged and maintenance free construction. This paper presents steady state analysis of a three phase self excited induction generator for wind energy application. The simulations are carried out by generating programs in MATLAB M-file to obtain various performance characteristics of the developed three phase SEIG model. A detailed discussion is carried out on different operational aspects of these machines on the basis of reported results.ICPEA 2013, 1st. International Conference on Power Electronics and their Applications, Djelfa, Algeria; 11/2013