Modeling and analysis of self-excited induction generator for wind energy conversion

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Self-Excited Induction Generators (SEIG) have recently emerged for wind energy conversion in remote and rural areas due to many advantages as standalone induction generator over Grid Connected Induction Generators. However, poor voltage and frequency regulation under varying load and speed is the prime disadvantage of standalone SEIG. Steady state analysis for such machines is important to understand their behavior under varying operating conditions. This paper presents a detailed d-q model of SEIG using Matlab/Simulink which contributes to the development of SEIG modeling with a limited complexity. From the generalized d-q model, the effect of different constraints such as, variation of prime mover speed, and excitation capacitor size, on the SEIG output built up process have been addressed and analyzed. The variation of the magnetizing inductance and the non-linearity is also considered.

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... Among the most common generations systems, WECS are increasingly becoming more cost competitive compared to all the environmentally safe and clean renewable energy source. Fixed speed WECS have gained much popularity among the manufacturers and developers in this field mainly due to the fact that this system uses a squirrel cage induction generator [5]. The design of larger wind turbines and reliability requirements match the features of multiphase machines due to their capability to split power and provide fault tolerance. ...
... SEIG can cope with a small increase in speed from their rated value because, due to saturation, the increasing rate of the generated voltage is not linear with the mechanical speed [7]. Understanding the voltage terminal build up process of SEIG and its performance under steady state and dynamic condition, it becomes a crucial issue toward the development of more efficient and competitive SEIG technology [5], [7]. For an SEIG, the external elements that can modify the voltage profile are the mechanical speed, the terminal capacitance and the connected load impedance [8], [9]. ...
... Also rotor voltage is expressed by equation = + j + j + " (6) [14] III. RESEARCH METHODOLOGY A real time prototype is made using asynchronous machine as IG and DC shunt motor as prime mover for the analysis purpose in laboratory. ...
... But, it suffers from the regular maintenance of the gearbox and the high cost of capacitor-bank required for the excitation. Besides, SEIG has poor voltage and frequency regulations, where it depends on excitation capacitance and prime mover speed [6], [7]. Moreover, DFIG is widely utilized in largescale WTGS due to its lower converter costs and lower power losses. ...
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In this paper, DQ-modeling approach for Transient State analysis in the time domain of the three-phase self-excited induction generator (SEIG) with squirrel cage rotor is presented along with its operating performance evaluations. The three-phase SEIG is driven by a variable-speed prime mover (VSPM) such as a wind turbine for the clean alternative renewable energy in rural areas. Here the prime mover speed has been taken both as fixed and variable and results have been analyzed. The basic Dynamic characteristics of the VSPM are considered in the three-phase SEIG approximate electrical equivalent circuit and the operating performances of the three-phase SEIG coupled by a VSPM in the Transient state analysis are evaluated and discussed on the conditions related to transient occurs in the system and speed changes of the prime mover. The whole proposed system has been developed and designed using MATLAB / SIMULINK.
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Conference Paper
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Due to increased emphasis on renewable resources, the development of suitable isolated power generators driven by energy sources such as wind, small hydro-electric, biogas, etc. have recently assumed greater significance. The capacitor self-excited squirrel cage induction generator has emerged as a suitable candidate of isolated electrical power sources. In this paper such a system is studied both by means of laboratory tests and by simulation.
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New perspectives on using induction generators in alternative energy technologies Durable and cost-effective, induction power generators have undergone numerous improvements that make them an increasingly attractive option for renewable energy applications, particularly for wind and hydropower generation systems. From fundamental concepts to the latest technologies, Alternative Energy Systems: Design and Analysis with Induction Generators, Second Edition provides detailed and accurate coverage of all aspects related to the design, operation, and overall analysis of such systems. Placing a greater emphasis on providing clear, precise, and succinct explanations, this second edition features new, revised, and updated content as well as figures, tables, equations, and examples. Each chapter introduces a multi-step, chapter-length problem relating the material to a real application. The solution appears at the end of the chapter, along with additional practice problems and references. New Material in This Edition: • Updated definitions for generated power and efficiency • Technological advances, such as new applications using doubly-fed induction generators • New methodologies, such as the magnetization curve representation for induction generators • Additional focus on renewable energy applications such as sea, wind, and hydropower systems • Totally re-written and updated chapter covering doubly-fed induction generators Alternative Energy Systems provides the tools and expertise for advanced students and professionals in electrical, mechanical, civil, and environmental engineering involved in the development of power plants.
Conference Paper
This paper presents the generalized dynamic modeling of self-excited induction generator (SEIG) using state-space approach. The proposed dynamic model consists of induction generator, self-excitation capacitance and load model are expressed in stationary d-q reference frame with the actual saturation curve of the machine. An artificial neural network (ANN)-model is implemented to estimate the machine magnetizing inductance based on the knowledge of magnetizing current. The dynamic performance of SEIG is investigated under no load, with the load, perturbation of load, short circuit at stator terminals, and variation of prime mover speed, variation of capacitance value by considering the effect of main and cross-flux saturation. During voltage buildup the variation in magnetizing inductance is taken into consideration. The performance of SEIG system under various conditions as mentioned above are simulated using MATLAB/SIMULINK and the simulation results demonstrates the feasibility of the proposed system.
Conference Paper
This paper explores the possibility of using a simple model for grid connected induction generators while studying the dynamic behavior of such systems. The approach used here is inspired from the method in use for the transient stability analysis of power systems. In this scheme both the stator and rotor transients of the machines are neglected. This enables the use of torque slip characteristics of the induction machines, in the analysis of their dynamic behavior. A concept of critical clearing slip has been introduced and its utility has been highlighted. The capabilities of the proposed model has been illustrated by studying the behavior of a sample system for the common types of events such as mechanical, electrical and switching disturbances.
Self-excited induction generators (SEIG) offer many advantages as variable-speed generators in renewable energy systems. Small hydro and wind generating systems have constraints on the size of individual machines, and several induction generators must be paralleled in order to access fully the potential of the site. SEIGs connected in parallel may lose excitation momentarily owing to large transient currents caused by differences in individual instantaneous voltages and frequency. This phenomenon cannot be easily simulated using the conventional models because it has such a fast transient nature. An innovative and automatic numerical solution for steady-state and transient analysis of any number of SEIGs operating in parallel is presented. Experimental results confirm the accuracy of the proposed model and open new possibilities for incorporating advanced control to monitor and optimise a parallel installation of SEIGs. The proposed SEIG model is applied to a two-turbine case, which can be extended to simulate a wind generating system.
The modeling and steady-state performance of single-phase induction generators based on the principles of harmonic balance is set forth in this paper. Magnetizing flux linkage saturation and flux dependent core loss resistances are included. Experimental results are provided to justify the analytical approach and steady-state calculations
Constant Voltage Operation of Self Excited Induction Generator using Optimization Tools
  • S H Vadhera
  • K S Sandhu
Wind Energy Generation Modelling and Control
  • O Anaya-Lara
  • N Jenkins
  • J Ekanayake
  • M Cartwright
  • Hughes