• 제목, 요약, 키워드: synchronous generator

검색결과 546건 처리시간 0.056초

외전형 영구자석형 전동/발전기의 성능해석 (Performance Analysis of External Rotor Type Permanent Magnet Motor/Generator)

  • 장석명;고종운;윤인기;이성호;정상섭
    • 대한전기학회:학술대회논문집
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    • pp.641-643
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    • 2002
  • Synchronous generator needs slip-ring and brush for supplying current to rotor with external source. but slip-ring and brush have some problems to supply DC power to field winding with friction and high power loss due to brush voltage drop at high field current. Thus synchronous generator have been designed to brushless machine. Brushless synchronous machines of using permanent halbach array can composed without back core and coreloss. In this paper, analyse on the characteristics of external rotor type permenant magnet brushless with halbach array.

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동기 발전기의 평형 및 불평형 고장해석 (Balanced and Unbalanced Fault Analysis of Synchronous Generator)

  • 박철원;안준영;이종수;이상성;신명철
    • 대한전기학회:학술대회논문집
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    • pp.402-404
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    • 2006
  • In this paper, we simulated transient-state under fault in stator windings of synchronous generator. The fault types are line to ground fault, line to line short fault, and three phase short fault. For fault analysis of generator system, the voltage equation of a synchronous machine using the two-axis theory was used. It can be used to analyze important features of faults and to develop enhanced protection methods.

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

  • 김종겸
    • 신재생에너지
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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.

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

  • 원정현;이상우;김동언;정진화;박현철
    • 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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5상 5KW 표면부착형 영구자석 동기발전기(SPMSG) 개발 (A Development of Surface Permanent Mount Synchronous Generator for 5 Phase 5KW)

  • 정형우;김민회;김동희
    • 조명전기설비학회논문지
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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.

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

  • 김수배
    • 전기학회논문지
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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.

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

  • 박정우;이기욱;김동욱;이광수;박진순
    • 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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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.

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

  • 최원연;박계도;이장명
    • 로봇학회논문지
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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.

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

  • 백승규;손명환;김석환;권영길
    • 한국초전도ㆍ저온공학회논문지
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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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