• Title, Summary, Keyword: synchronous generator

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Adaptive Sliding Mode Controller Design of Permanent Magnet Synchronous Generator for Variable-Speed Wind Turbine System (가변속 풍력 발전용 영구자석형 동기발전기의 적응 슬라이딩 모드 제어기 설계)

  • Kim, Seong-Soo;Choi, Han Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.5
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    • pp.315-319
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    • 2016
  • This paper proposes a simple adaptive sliding mode control algorithm for controlling a permanent magnet synchronous generator (PMSG) of a MW-class direct-driven wind turbine system. The proposed adaptive sliding mode controller does not require accurate knowledge of the PMSG parameter or turbine torque values. The proposed controller can accurately track the reference angular speed computed by the maximum power point tracking(MPPT) algorithm. Finally, this paper gives Matlab/Simulink simulation results to verify the practicality and effectiveness of the proposed adaptive sliding mode controller.

Analysis for the Operating Characteristics when the Induction Motor is Used as a Generator (유도전동기를 발전기로 사용시 동작 특성 해석)

  • Kim, Jong-Gyeum
    • New & Renewable Energy
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    • v.10 no.2
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    • pp.5-11
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    • 2014
  • Squirrel cage induction motor is the main driving system of industrial field and familiar with its use in a large variety of applications. The structure and operating characteristics of induction generator is almost identical to induction motor, but the induction generator part is used restrictively from hydropower power and wind power development etc. Recently induction generator is commonly used for micro & small hydro power applications due to its simplicity, reliability, low cost and robustness. Input and output of induction motor has turned against at the induction generator operation. Rotation speed of induction generator is small faster than synchronous speed of induction motor. As output of induction machines increases with the increasement of speed, so loss is same. Actually, generator efficiency is lower than motor at this condition. If induction generator is connected with mechanical load such as increaser, total efficiency is decreased. Consequently the quality in compliance with an induction motor parameter applying like that in the generator is a possibility of having the error of some. In this paper, we analyzed that input, output, torque and efficiency of induction machine is different from each other above and below synchronous speed.

Study on the Application of Advanced Generator Models in Korean Power Systems (국내 전력계통에 개선된 발전기 모델 적용에 관한 연구)

  • Kim, Soobae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.2
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    • pp.285-291
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    • 2017
  • This paper proposes the use of advanced generator models in the studies of Korean power systems to accurately represent the dynamic behaviors of synchronous generators and thus to achieve a better match between transient stability simulations and reality. In the paper, GENTPF and GENTPJ models are described which have appeared over the last decade in the WECC system. Those advanced models are compared with conventional synchronous generator models such as GENROU and GENSAL, which have been used in dynamic studies of Korean power systems. The advancements are investigated by recognizing the differences in block diagram, saturation modeling, and network interface equations. Simulation comparisons between conventional and advanced models in Korean power systems are then provided. Clear distinctions identified in the simulation results demonstrate the necessity of the use of advanced generator models in Korean power system.

The Analysis of 3MW Embedded Type PMSG for Wind Turbine (풍력 발전기용 3MW 매립형 영구자석동기발전기 해석)

  • Won, Jeonghyun;Lee, Sangwoo;Kim, D.E.;Chung, Chinwha;Park, H.C.
    • 한국신재생에너지학회:학술대회논문집
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    • pp.180.1-180.1
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    • 2010
  • This paper introduces a 3MW embedded Permanent Magnet Synchronous Generator(PMSG) for wind turbine. The generator features 313mm stator inner radius and 974mm stator length. The blade rotor angular velocity is 15.7 rpm and the gear ratio is set to be 92.93. The nominal generator rpm at rated load is about 1459. The number of poles is six and embedded in the generator rotor. Embedded permanent magnet excitation shows higher reliability, and better efficiency. Using the finite element method, electromagnetic and thermal results are simulated by ANSYS and the results are summarized in this report.

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A Development of Surface Permanent Mount Synchronous Generator for 5 Phase 5KW (5상 5KW 표면부착형 영구자석 동기발전기(SPMSG) 개발)

  • Jung, Hyung-Woo;Kim, Min-Huei;Kim, Dong-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.11
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    • pp.87-96
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    • 2012
  • This paper propose a development of surface permanent mount synchronous generator(SPMSG) for 5-phase 5Kw in order to study a polyphase ac machinery that keep hold of advantages more than traditional three-phase squirrel-cage induction motor, such as reducing a amplitude of torque pulsation decreasing electric noises, and increasing the reliability. Design methods of the generator use a development tools with Maxwell 2D and Simplorer. There are designed drawing of manufactured frames of the SPMSG. A amplitude and waveform of the generated electromotive force, FFT analysis of harmonics within output voltages, and reviewing a experiment results are shown by variable output frequency. We are presenting a design and manufacture methods for the SPMSG.

Control characteristics of the prototype power trains of 1MW Uldolmok tidal current plant (울돌목 조류발전소 설치용 1MW 발전설비 시제품 제어특성)

  • Park, Jung-Woo;Lee, Ki-Wook;Kim, Dong-Wook;Lee, Kwang-Soo;Park, Jin-Soon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.644-647
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    • 2007
  • We have developed electrical power train for 1MW tidal current plant which is composed of both 500kW tidal current plant with doubly-fed induction generator and 500kW tidal current plant with synchronous generator. To check performances of the protype, 2MW dynamometer is used to simulate a helical turbine, and then protype generator and converter are coupled with the dynamometer separately. From the suggested experimental results it is reconfirmed that two kinds of the power train to be installed at the Uldolmok located at southwestern shore in Korea are able to operate under all kinds of the condition about speed and power.

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Efficient Measurement of Wind Velocity and Direction Using Dual Rotor Wind Power Generator in Vessel (Dual Rotor 풍력발전을 이용한 선박에서의 효과적인 풍향 풍속 측정)

  • Choi, Won-Yeon;Park, Gye-Do;Lee, Jang-Myung
    • The Journal of Korea Robotics Society
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    • v.5 no.4
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    • pp.309-317
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    • 2010
  • This paper proposes an efficient measurement system for the velocity and direction of the wind using the dual rotor wind power generator in vessel. Conventional digital measurement system recognizes the direction and the velocity of the wind using the electric compass or synchronous motor and Vane probe method using hall sensors. But each system has its own short-comings: the synchronous motor has a larger measurement error than the magnetic compass and magnetic compass is weak for the external disturbances such as fluctuation of the vessel. To compensate these short-comings, this paper proposes a new compensation algorithm for the fluctuation errors according to the external interference and the unexpected movement of the vessel along the roll and pitch directions. The proposed system is implemented with the dual compasses and a synchronous motor. The proposed independent power generation system can be operated by itself and can raise the efficiency of the wind power generation systems of 30 ~ 400 W installed along the vertical and horizontal axes. The proposed system also realizes the efficient and reliable power production system by the MPPT algorithm for the real-time recognition of the wind direction and velocity. An advanced switching algorithm for the battery charging system has been also proposed. Effectiveness of the proposed algorithm has been verified through the real experiments and the results are demonstrated.

Damping for Wind Turbine Electrically Excited Synchronous Generators

  • Tianyu, Wang;Guojie, Li;Yu, Zhang;Chen, Fang
    • Journal of Electrical Engineering and Technology
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    • v.11 no.4
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    • pp.801-809
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    • 2016
  • The electrically excited synchronous generator (EESG) is applied in wind turbine systems recently. In an EESG control system, electrical torque is affected by stator flux and rotor current. So the control system is more complicated than that of the permanent-magnet synchronous generator (PMSG). Thus, the higher demanding of the control system is required especially in case of wind turbine mechanical resonance. In this paper, the mechanism of rotor speed resonant phenomenon is introduced from the viewpoint of mechanics firstly, and the characteristics of an effective damping torque are illustrated through system eigenvalues analysis. Considering the variables are tightly coupled, the four-order small signal equation for torque is derived considering stator and rotor control systems with regulators, and the bode plot of the closed loop transfer function is analyzed. According to the four-order mathematical equation, the stator flux, stator current, and electrical torque responses are derived by torque reference step and ramp in MATLAB from a pure mathematical deduction, which is identical with the responses in PSCAD/EMTDC simulation results. At last, the simulation studies are carried out in PSCAD software package to verify the resonant damping control strategy used in the EESG wind turbine system.

Design of Excitation Control System of Synchronous Generator on Board Ships (선박용 동기 발전기의 여자 제어시스템 설계)

  • Lee, Youngchan;Jung, Byung-Gun
    • Journal of the Korean Society of Marine Engineering
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    • v.39 no.3
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    • pp.298-305
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    • 2015
  • This paper provides experimental results of an excitation control system of the synchronous generator on board ships in accordance with rules of classification society to make sure its performance. The experiment compares and reviews control results between PID control and fuzzy logic control applied to change of loads of the generator in order to make sure to satisfy the rules of classification society. Both of them are written by Labview program. In case of PID Control, this paper firstly adjusts the gains by ultimate sensitive method and the gains is more tuned by engineer's experience. And the fuzzy logic controller uses Mamdani method to make membership function for error between reference voltage and measuring voltage, differential error rate and output voltage. This paper is to make sure the experimental results of the proposed excitation control system applied to actual small synchronous generator with PID control and fuzzy logic written by using Labview program and it is proved on stability and improvement through experiments.

Superconducting Synchronous Motor Design considering Machine Losses (손실을 고려한 초전도 동기전동기 설계)

  • 백승규;손명환;김석환;권영길
    • Progress in Superconductivity and Cryogenics
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    • v.3 no.2
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    • pp.21-26
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    • 2001
  • Superconducting synchronous generators and motors are designed based on 2 dimensional electro-magnetic approach. In the case of generator, if the machine output rating and terminal voltage are decided the armature rating current will be decided automatically according to its power factor. However, in the case of motor, if the output rating is given with [hp] or [kw] units, the armature terminal voltage and current are not decided directly because the machines armature input power and mechanical output are different by way of losses. So in order to calculate the armature current more accurately. the machine losses must be included in the design procedure. In this paper the machine loss of superconducting motor are analyzed and used for decision of the armature input power and current. Moreover, the differences of voltage equations between superconducting synchronous generator and motor are considered.

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