• Title/Summary/Keyword: Induction generator modeling

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Comparison of Characteristics for Variable Operation using Doubly-fed Induction Generator and Fixed Speed Operation in Wind Turbine System (이중여자 유도발전기를 이용한 가변속운전과 정속운전 풍력발전시스템의 운전특성 비교)

  • Ro, Kyoung-Soo;Kim, Tae-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.7
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    • pp.1313-1320
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    • 2009
  • This paper analyzes the steady-state operating characteristics of doubly-fed induction generator(DFIG) and fixed-speed induction generator(FSIG) in wind turbine system. It also presents a modeling and simulation of a grid-connected wind turbine generation system for dynamics analysis on MATLAB/Simulink, and compares the responses between DFIG and FSIG wind turbine systems with respect to wind speed variation, 3-phase fault and 1-phase ground fault of the network. Simulation results show the variations of generator's active/reactive output, rotor speed, terminal voltage, fault current, etc. Case studies demonstrate that DFIG illustrates better performance compared to FSIG.

Speed control of a induction motor system using digital control method (유도전동기의 디지탈 속도 제어)

  • 이충환;김상봉;하주식
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.987-992
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    • 1992
  • In recent years, induction motor is applied for several industrial actuatung parts instead of direct current motor because of the robust construction, nonexpensive and maintenance-free actuator etc. and having capability of speed control according to development of power electrounics and microprocessor techniques. In the paper, a microprocessor-based digital control approach for spped control of induction motor system is presented by considering a simple modelling equation as the system expression equation of induction motor and using the self tuning control and torque effdforward control method. As the model equation of the induction motor system, we use a second order differential equation which is well known in the modeling equation is induced form the control theory stand point such tath we can describe usually the motor system connected by inverter, generator and load etc. The effectiveness of the control system composed by the above mentioned design concept is illustrated by the expermental result in the presence of step reference change and generator load variation.

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Electrical Machines for High Speed Applications with a Wide Constant-Power Region Requirement

  • Gerada, David;Borg-Bartolo, David;Mebarki, Abdeslam;Micallef, Christopher;Brown, Neil L.;Gerada, Chris
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.3
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    • pp.274-281
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    • 2012
  • This paper discusses the issues associated with the design of high speed machines for applications with a wide constant-power region requirement. Using described multi-domain design environments which put equal weight on the electromagnetic, thermal and mechanical considerations, the suitability and power density achievable using Induction Machines (IM) and Permanent Magnet Synchronous Machines (PMSM) are compared.

Modeling of a Compressed Air Energy Electrification by Using Induction Generator Based on Field Oriented Control Principle

  • Vongmanee, Varin;Monyakul, Veerapol
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1511-1519
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    • 2014
  • The objective of this paper is to propose a modelling of a small compressed air energy storage system, which drives an induction generator based on a field-oriented control (FOC) principle for a renewable power generation. The proposed system is a hybrid technology of energy storage and electrification, which is developed to use as a small scale of renewable energy power plant. The energy will be transferred from the renewable energy resource to the compressed air energy by reciprocating air compressor to be stored in a pressurized vessel. The energy storage system uses a small compressed air energy storage system, developed as a small unit and installed above ground to avoid site limitation as same as the conventional CAES does. Therefore, it is suitable to be placed at any location. The system is operated in low pressure not more than 15 bar, so, it easy to available component in country and inexpensive. The power generation uses a variable speed induction generator (IG). The relationship of pressure and air flow of the compressed air, which varies continuously during the discharge of compressed air to drive the generator, is considered as a control command. As a result, the generator generates power in wide speed range. Unlike the conventional CAES that used gas turbine, this system does not have any combustion units. Thus, the system does not burn fuel and exhaust pollution. This paper expresses the modelling, thermodynamic analysis simulation and experiment to obtain the characteristic and performance of a new concept of a small compressed air energy storage power plant, which can be helpful in system designing of renewable energy electrification. The system was tested under a range of expansion pressure ratios in order to determine its characteristics and performance. The efficiency of expansion air of 49.34% is calculated, while the efficiency of generator of 60.85% is examined. The overall efficiency of system of approximately 30% is also investigated.

Wind Power System using Doubly-Fed Induction Generator and Matrix Converter (매트릭스컨버터와 이중여자유도발전기를 사용한 풍력발전시스템)

  • Lee, Dong-Geun;Kwon, Gi-Hyun;Han, Byung-Moon;Li, Yu-Long;Choi, Nam-Sup;Choy, Young-Do
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.985-993
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    • 2008
  • This paper proposes a new DFIG(Doubly-Fed Induction Generator) system using matrix converter, which is very effectively used for interconnecting the wind power system to the power grid. The operation of proposed system was verified by computer simulations with PSCAD/EMTDC software. The feasibility of hardware implementation was conformed by experimental works with a laboratory scaled-model of wind power system. The laboratory scaled-model was built using a motor-generator set with vector drive system, and a matrix converter with DSP(Digital Signal Processor). The operation of scaled-model was tested by modeling the specific variable-speed wind turbine using the real wind data in order to make the scaled-model simulate the real wind power system as close as possible. The simulation and experimental results confirm that matrix converter can be applied for the DFIG system.

Speed Control of Induction Motor Systems by Design Method of Digital Servo System (디지탈 서보계 설계법에 의한 유도 전동기 시스템의 속도 제어)

  • 김상봉;김환성;이동철;하주식
    • Journal of Advanced Marine Engineering and Technology
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    • v.16 no.4
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    • pp.50-59
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    • 1992
  • The paper presents a digital speed control approach of induction motor systems by using a digital servo control method and a well-known second order differential equation as model. The basic concept of using the modeling equation stated in the above is induced from the control theory stand point such that we can describe usually the motor system connected by inverter, generator and load etc, just as a mechanical system to be controlled. The concept does not demand us the complicated vector-based modeling equation adopted in the traditional methods for the speed control of induction motor. Futhermore, the proposed speed control system can be treated as a single input and single output system. The effectiveness of the servo control system obtained by the above-mentioned design concept is illustrated by the experimental results in the presence of both step reference changes and load variations. It is observed from the experimental results that the steady state-error of the experimental set up becomes zero after some regulation time and the induction motor system is robust in spite of reference signal changes and load variations.

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Modeling of a Dual Stator Induction Generator with and Without Cross Magnetic Saturation

  • Slimene, Marwa Ben;Khlifi, Mohamed Arbi;Fredj, Mouldi Ben;Rehaoulia, Habib
    • Journal of Magnetics
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    • v.20 no.3
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    • pp.284-289
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    • 2015
  • This paper discusses general methods of modelling magnetic saturation in steady-state, two-axis (d & q) frame models of dual stator induction generators (DSIG). In particular, the important role of the magnetic coupling between the d-q axes (cross-magnetizing phenomenon) is demonstrated, with and without cross-saturation. For that purpose, two distinct models of DSIGs, with and without cross-saturation, are specified. These two models are verified by an application that is sensitive to the presence of cross-saturation, to prove the validity of these final methods and the equivalence between all developed models. Advantages of some of the models over the existing ones and their applicability are discussed. In addition, an alternative is given to evaluate all saturation factors (static and dynamic) by just calculating the static magnetizing inductance which is simply the magnitude of the ratio of the magnetizing flux to the current. The comparison between the simulation results of the proposed model with experimental results gives a good correspondence, especially at startup.

Modeling and Control of a Doubly-Fed Induction Generator (DFIG) Wind Power Generation System for Real-time Simulations

  • Byeon, Gil-Sung;Park, In-Kwon;Jang, Gil-Soo
    • Journal of Electrical Engineering and Technology
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    • v.5 no.1
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    • pp.61-69
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    • 2010
  • This paper presents a study of a DFIG wind power generation system for real-time simulations. For real-time simulations, the Real-Time Digital Simulator (RTDS) and its user friendly interface simulation software RSCAD are used. A 2.2MW grid-connected variable speed DFIG wind power generation system is modeled and analyzed in this study. The stator-flux oriented vector control scheme is applied to the stator/rotor side converter control, and the back-to-back PWM converters are implemented for the decoupled control. The real-wind speed signal extracted by an anemometer is used for a realistic, reliable and accurate simulation analysis. Block diagrams, a mathematical presentation of the DFIG and a control scheme of the stator/rotor-side are introduced. Real-time simulation cases are carried out and analyzed for the validity of this work.

Performance analysis of 2-phase self-excited Induction Generator (2권선 자기 여자 유도 발전기의 특성 해석)

  • Kim Cherl-jin;Lee Kwan-young;Lee Yun-Jin;Baek Soo-Hyun;Han Kung-Hee
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.938-940
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    • 2004
  • With increased emphasis on non-conventional energy system and autonomous power generation, development of improved and appropriate generating system has assumed signification. This paper describes the performance analysis of 2-phase self-excited induction generators. The minimum capacitance of self-excited capacitor connected auxiliary winding is determined the suitable value using circuit equations of auxiliary winding. For the steady state analysis, the equivalent circuit of 2-phase induction generators is used as circuit modeling using the double-revolving field theory. The validity of designed generator system will be confirmed by experimental and computed results.

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A Design Scheme of Single-Phase Induction Generator Considering Self-excitation and Voltage Regulation (자기여자 현상 및 출력전압 안정화를 고려한 단상유도발전기의 설계방안)

  • Kim, Cherl-Jin;Lee, Kwan-Yong;Kim, Young-Tae;Shin, Heung-Kyo
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1002-1004
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    • 2005
  • This paper describes the performance analysis and design of single-phase self-excited induction generators. In this study, it is proposed to design the proper capacitance for self-excitation and voltage regulation, also. This methods are based on the induced MMF equations between main and the auxiliary winding. For the least influence between the two capacitors, the self-excited capacitor is selected under no load condition, while the series capacitor is designed under loaded condition. For the steady state analysis, the equivalent circuit of single-phase induction generators is used as circuit modeling using the double-revolving field theory. The validity of proposal methods and designed generator system will be confirmed by experimental and computed results.

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