• Title, Summary, Keyword: synchronous generator

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A Study on the Suppression of Abnormal Field Voltage in the Static Excitor Type Synchronous Generator (정지여자형 동기발전기의 계자이상전압 억제에 관한 연구)

  • 윤병도;이원교
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.35 no.2
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    • pp.55-61
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    • 1986
  • This paper describes the generation region and suppression effect of the abnormal field voltage induced when the synchronous generator is switched to the infinite bus, the critical value of negative field current is calculated by simmulation which has parameters of the phase difference and voltatge ratio between the bus and the generator. The suppression effect of discharge resistance connected in parallel with the field circuit is also investigated. According to this study, the optimal value of discharge resistance which can suppress effectively the abnormal field voltage may be calculated.

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Permanent Magnet Excited Generator For Gearless Wind Generation Plant

  • Curiac, Paul;Kang, D.H.;Park, D.Y.
    • Proceedings of the KIEE Conference
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    • pp.455-458
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    • 2001
  • This paper presents an axial flux permanent magnet synchronous generator with a high power-to-weight ratio, dedicated for small-scale gearless wind power generation plants. For this purpose, a specific design is necessary to meet the imposed requirements. In this paper the design technique for the specifications is presented. The aim of the paper is also to discuss some of the first obtained test results and the involved demagnetizing problem (i.e. short-circuit).

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Development of EMTDC Classical Generator Model Considering Reactive Power Control (무효전력제어를 고려한 EMTDC Classical Generator 모델개발)

  • Lee, Seung-Ryul;Yoon, Jae-Young;Choi, Heung-Kwan;Kim, Jong-Yul
    • Proceedings of the KIEE Conference
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    • pp.101-103
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    • 2003
  • In power system, the study on synchronous generators is an important issue. Among the studies, reactive power control of synchronous generators is very important from the viewpoint of power system stability. In this study, we develope a classical generator model and a power factor regulation model applying a simple algorithm in order to control reactive power generation, using EMTDC.

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Characteristic Analysis of Double-sided Linear Synchronous Generator with Variable Load (양측식 선형발전기의 부하 가변에 따른 특성 고찰)

  • Jeong, Su-Kwon;Lee, Dong-Yeup;Jang, Ki-Bong;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • pp.41-43
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    • 2008
  • This paper presents the characteristic analysis of Double-Sided Linear Synchronous Generator for wave power generation under different operating conditions. FEM is applied to analyze performance of generator at no-load and load with variable resistance. Moreover, the validity of characteristic analysis is confirmed through the experimental work.

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Characteristic Analysis of Shorted-turn for Generator Rotor (발전기 회전자의 층간단락에 대한 특성 해석)

  • Kim S.J.;Jeon Y.S.;Lee S.H.;Choe G.H.
    • Proceedings of the KIPE Conference
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    • pp.137-140
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    • 2003
  • Shorted-turns can have significant effects on a generator and its performance. Shorted-turn sensor for synchronous generator's field winding have been developed. One of effective method detecting inter-turn short circuits on round rotor winding is a method using sensor detecting. But the method needs duplicate design of sensor for characteristic change according to types and forms of generator Thus sensing skill without sensor depend on change of electric property in generator. For the reason, this paper presents shorted-turns phenomenon and the characteristic analysis of shorted-turns In synchronous generator by using 2-D finite element method(FEM).

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Conceptual design of 10 MW class gearless type superconducting synchronous generator for wind turbine (10 MW급 gearless 타입 초전도 풍력발전기의 개념 설계)

  • Kim, Nam-Won;Kim, Gyeong-Hun;Kim, Kwang-Min;Kim, Seok-Ho;Park, Min-Won;Yu, In-Keun;Lee, Sang-Jin
    • Proceedings of the KIEE Conference
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    • pp.1294-1295
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    • 2011
  • This paper describes a conceptual design of 10 MW class gearless type superconducting synchronous generator for wind turbine. The main benefits of gearless type generator are decrease of the process of maintenance and loss caused by drive-train. The designed generator improves efficiency of high-capacity wind turbine by applying superconducting coil making high magnetic field. Conventional wind turbines were investigated for up-scaling of generator and the generator had been designed with estimated design parameters using a finite elements method analysis tool.

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Experimental Assessment with Wind Turbine Emulator of Variable-Speed Wind Power Generation System using Boost Chopper Circuit of Permanent Magnet Synchronous Generator

  • Tammaruckwattana, Sirichai;Ohyama, Kazuhiro;Yue, Chenxin
    • Journal of Power Electronics
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    • v.15 no.1
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    • pp.246-255
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    • 2015
  • This paper presents experimental results and its assessment of a variable-speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG) and boost chopper circuit (BCC). Experimental results are obtained by a test bench with a wind turbine emulator (WTE). WTE reproduces the behaviors of a windmill by using servo motor drives. The mechanical torque references to drive the servo motor are calculated from the windmill wing profile, wind velocity, and windmill rotational speed. VSWPGS using PMSG and BCC has three speed control modes for the level of wind velocity to control the rotational speed of the wind turbine. The control mode for low wind velocity regulates an armature current of generator with BCC. The control mode for middle wind velocity regulates a DC link voltage with a vector-controlled inverter. The control mode for high wind velocity regulates a pitch angle of the wind turbine with a pitch angle control system. The hybrid of three control modes extends the variable-speed range. BCC simplifies the maintenance of VSWPGS while improving reliability. In addition, VSWPGS using PMSG and BCC saves cost compared with VSWPGS using a PWM converter.

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

  • Jang, S.M.;Go, J.W.;Yoon, I.K.;Lee, S.H.;Jeong, S.S.
    • Proceedings of the KIEE Conference
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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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Balanced and Unbalanced Fault Analysis of Synchronous Generator (동기 발전기의 평형 및 불평형 고장해석)

  • Park, Cheol-Won;An, Jun-Yeong;Lee, Jong-Su;Lee, Sang-Seong;Sin, Myeong-Cheol
    • Proceedings of the KIEE Conference
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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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Low-Voltage and High-Current DC Output Realized by Multiple Power Cells Based on Deadbeat and Automatic Current Sharing Control

  • Liu, Jinfeng;Zhang, Yu;Wang, Xudong;IU, Herbert Ho-Ching
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1575-1585
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    • 2017
  • This paper presents a synchronous generator with a distributed system of multiple parallel three-phase power cells. This generator can immediately output high DC. Each power cell comprises three-phase windings and a three-phase synchronous rectification bridge with a deadbeat control of load power feedforward, which can improve the characteristics of dynamic response and reflect the load variance in real time. Furthermore, each power cell works well independently and modularly using the method of automatic maximum current sharing. The simulation and experimental results for the distributed controller of multiple power cells demonstrate that the deadbeat control method can respond quickly and optimize the quality of the energy. Meanwhile, automatic maximum current sharing can realize the validity of current sharing among power cells.