35 Steady State Analysis of Wind Driven Self Excited Induction Generator (original) (raw)
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Steady State Analysis of Self-Excited Induction Generator
Lalit Goyal & Om Prakash Mahela , 2013
Induction generators are increasingly used in non-conventional energy systems such as wind, mini/micro hydro etc. In isolated systems, squirrel cage induction generators with capacitor excitation, known as self-excited induction generators (SEIG), are very popular. Steady state analysis for such machines is essential to estimate the behavoir under actual operating conditions. A 5.5KW induction machine excited with symmetrical capacitor bank and loaded with resistive or resistive-inductive load was the subject of investigation. A simple mathematical model is proposed to compute the steady-state performance of self-excited induction generator by nodal admittance model. MATLAB programming is used to solve the proposed model. The results confirms the validity and accuracy of the MATLAB based modeling of self- excited induction generator.
Capacitance Required Analysis for Self-Excited Induction Generateur
2013
The main drawback of induction generator in wind energy conversion systems applications is its need for leading reactive power to build up the terminal voltage and to generate electric power. Using terminal capacitor across generator terminals can generate this leading reactive power. The capacitance value of the terminal capacitor is not constant but it is varying with many system parameters like shaft speed, load power and its power factor. If the proper value of capacitance is selected, the generator will operate in selfexcited mode. This paper presents direct methods derived from loop and nodal analyses to obtain different criteria for maintaining self-excitation and performance characteristics of an isolated, three-phase, selfexcited induction generator (SEIG). Results of a detailed investigation on a conventional 3kW induction motor operated as a SEIG are presented to illustrate the effectiveness of the proposed method.
IAETSD JOURNAL FOR ADVANCED RESEARCH IN APPLIED SCIENCES, 2021
With advancement in new edge machine technology, self-excited induction generators (SEIG) has gained attention of researchers in the field of renewable energy exploration and exploitation. SEIG has increasingly been used in generating electrical energy from conventional and non-conventional energy sources. The main drawback of induction generator in wind energy conversion systems applications is its need for leading reactive power to build up the terminal voltage and to generate electric power. Using terminal capacitor across generator terminals can generate this leading reactive power. The capacitance value of the terminal capacitor is not constant but it is varying with many system parameters speed, load power and its power factor. If the proper value of capacitance is selected, the generator will operate in self-excited mode. To find this capacitor value two non-linear equations have to be solved. Different numerical methods for solving these equations under R-L load. This paper reviews the previous techniques and a complete mathematical analysis over starting period to find the minimum excitation capacitor required (−) of self excited induction generators (SEIG)using two method Nodal Admittance Approach and Loop Impedance Approach
Electric Power Systems Research, 2012
The paper presents the application of DIRECT algorithm to analyse the performance of the Self-excited induction generator (SEIG). To the author best knowledge, this is the first attempt to apply it to such a problem. DIRECT algorithm is used to minimize the induction generator's admittance without the need to separate it into its real and imaginary parts. No initial guess is required as it needs only the upper and lower values of the unknown variables which are easily determined. The obtained minimum admittance yields the adequate magnetizing reactance and the frequency. These two key parameters are then used to compute the self-excitation process requirements in terms of the prime mover speed, the capacitance and the load impedance on the one hand and to predict the generator steady state performance parameters on the other. Very good agreement between predicted results and experimental measurements is achieved.
EXPERIMENTAL INVESTIGATION OF SELF-EXCITED INDUCTION GENERATOR FOR INSULATED WIND TURBINE
– The use of induction machine in autonomous operating mode of wind turbine generators is very appreciated in many applications for economic, logistic and technical issues. However, the induction machine model, which is naturally nonlinear, becomes more complicated with the addition of external capacitive bank for the self-excitation of the machine. The present paper provides a theoretical and experimental investigation of a self-excited induction generator (SEIG) behavior for various connection topologies by considering the machine magnetic saturation. A good agreement between simulation and experimental result is obtained from the benchmark test which includes various balanced and unbalanced loads with and without power convert.
TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES20, 2020
The three-phase self-excited induction generator (SEIG) plays a basic rule in sources of renewable energy, such as wind turbines (WT). His main defect is poor regulation of output voltage and frequency under variable rotor speed and load conditions at stand-alone and isolated area operation mode. In this paper, a complete dynamic model of the SEIG-WT system is performed to analyze and study the system performance under transient and steady-state conditions. This dynamic model considers into account the effect of saturation in magnetizing inductance, cross-coupling magnetizing inductance, stator, and rotor leakage inductances, iron core resistance, and mechanical (friction and windage ) loss resistance, as well as the effect of stray load resistance, are considered in this model.New analytical formulas are used to accurate calculation of minimum and maximum values of excitation capacitance and generator rotor cut-off and maximum speed. The results of the dynamic model are partially compared with experimental results, and accurate agree are shown.
Analysis of wind driven self-excited induction generator supplying isolated DC loads
Journal of Electrical Systems and Information Technology, 2017
This paper presents the analysis, modelling and simulation of wind-driven self-excited induction generator (SEIG). The three-phase SEIG is driven by a variable-speed prime mover to represent a wind turbine. Also, the paper investigates the dynamic performance of the SEIG during start-up, increasing or decreasing the load or rotor speed. The value of the excitation capacitance required for the SEIG is calculated to give suitable saturation level to assure self-excitation and to avoid heavy saturation levels. Matching of the maximum power available from the wind turbine is performed through varying the load value. The effect of AC-DC power conversion on the generator is investigated. The system simulation is carried out using MATLAB/SIMULINK toolbox program.
2011
This paper explains a method to calculate the capacitance value of a 3-Ø cage induction motor working as a generator in the self-excited mode of operation. The synchronous impedance test method has been reviewed. The capacitance value is determined from the manufacturer data. The effect of voltage variation with different capacitances has been evaluated at constant speed. Performance of self-excited asynchronous generator (SEASG) with the capacitance (calculated value) is evaluated experimentally. Simulation study of the SEASG is done using power sytem tool box in Mat Lab/Simulink.
Performance Analysis of Self-Excited Induction and Reluctance Generators
Electric Machines & Power Systems, 1991
To ensure the complete control of AC machine, state analysis is highly required during the dynamic modelling. In this paper, a mathematical model of the self-excited induction generator (SEIG) is developed to analyse its operation in wind energy systems. A generalised steady state model using d-q stationary reference frame of such a three phase SEIG has been developed. The model has been analysed for balanced and unbalanced excitation condition. Moreover, the effect of wind speed and pitch angle in generator response is observed. Eventually, the model is tested for static and dynamic loads. The analysis of the results could help to determine the efficiency solutions for the system to supply isolated areas even when the loads are unbalanced. The derived equations and developed model are verified through the simulation results of MATLAB simulator.