• Title/Summary/Keyword: synchronous generator

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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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    • 2003.07a
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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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    • 2011.07a
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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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1MVA synchronous generator control for vessel used for digital AVR of drop method (Drop 방식의 디지털 AVR을 이용한 1MVA급 선박용 동기발전기 제어)

  • Yoo, Dong-Hwan;Hwang, Chun-Hwan;Park, Sang-Hoon;Yoo, Jae-Sung;Lee, Sang-Suk;Won, Chung-Yuen
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.11a
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    • pp.225-229
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    • 2007
  • The output voltage of a synchronous generator is regulated constantly by field current control of excitation system. Synchronous generator exciter has two type, first one is Drop control type by thyristor and second one is exciter current control type through power output by PWM control. Control method of the second one prevails, but when the power devices have a breakdown, output voltage of the generator rises rapidly. This exciter must have a protection circuit and system is complicated, so reliability is poor Excitation control type which is drop control type control only 10% of the power, so it can be improved precision. When a trouble come to the controller, output voltage of a generator don't rise excessively and the voltage rise about 10%, so it has a excellent reliability. This paper prove stability of the digital AVR.

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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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    • 2002.07b
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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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Simulation for Voltage Variation of a Permanent Magnetic Synchronous Generator Wind Turbine Systems on Simulink (Simulink에서 영구자석 동기형 풍력발전시스템의 전압변동에 대한 시뮬레이션)

  • An, Hae-Joon;Kim, Hyun-Goo;Kim, Hong-Woo;Jang, Gil-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.184.2-184.2
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    • 2010
  • This study performs modelling and simulation of permanent magnetic synchronous generator wind turbine by using Matlab & Simulink. In simulation, change of wind velocity, change of load, and voltage decrease of infinite bus are performed. Through such simulation, different with wiring system that there is only existing load, this study can confirm problems and voltage changing characteristics, which can occur in distributed electric power that load and electric power is mixed and operated, especially, in interconnecting with wind power generation.

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Experimental Evaluation on Power Loss of Coreless Double-side Permanent Magnet Synchronous Motor/Generator Applied to Flywheel Energy Storage System

  • Kim, Jeong-Man;Choi, Jang-Young;Lee, Sung-Ho
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.256-261
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    • 2017
  • This paper deals with the experimental evaluation on power loss of a double-side permanent magnet synchronous motor/generator (DPMSM/G) applied to a flywheel energy storage system (FESS). Power loss is one of the most important problems in the FESS, which supplies the electrical energy from the mechanical rotation energy, because the power loss decreases the efficiency of energy storage and conversion of capability FESS. In this paper, the power losses of coreless DPMSM/G are separated by the mechanical and rotor eddy current losses in each operating mode. Moreover, the rotor eddy current loss is calculated by the 3-D finite element analysis (FEA) method. The analysis result is validated by separating the power loss as electromagnetic loss and mechanical loss by a spin up/down test.

Design of Slot Wedge Shape for Reducing Cogging Torque in Outer Rotor Type Permanent Magnet Synchronous Generator with Open Slot Structure (개방형 슬롯 구조를 갖는 외전형 영구자석 동기발전기의 코깅 토크 저감을 위한 슬롯 ��지 형상 설계)

  • Kim, Bong-Ju;Park, Su-Kang;Moon, Jae-Won;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.936-938
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    • 2011
  • This paper suggests the slot wedge shape for reducing the cogging torque of a gearless type direct-drive permanent magnet synchronous generator with open slot shape. To achieve this, we are designed the appropriate specifications of the permanent magnet synchronous generator by selected the appropriate material of slot wedge and various slot wedge shapes. The PMSG models were analyzed by finite element method. Finally, we have suggested appropriate material of slot wedges and its shape which has benefit to further reducing cogging torque and preventing decreasing of the generating power.

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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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    • 2006.11a
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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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Adaptive Controller Design for a Synchronous Generator with Unknown Perturbation in Mechanical Power

  • Jiao Xiaohong;Sun Yuanzhang;Shen Tielong
    • International Journal of Control, Automation, and Systems
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    • v.3 no.spc2
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    • pp.308-314
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    • 2005
  • Transient stabilization with voltage regulation is investigated for a synchronous generator when the mechanical power is perturbed to any unknown value within its physical bounds so that the operating point of the system shifts to an unknown point. An adaptive excitation controller is designed based on the backstepping method with tuning functions. It will be shown that the adaptive control law proposed can achieve the convergence of the system states to the new equilibrium point in correspondence with the real value of the unknown mechanical power and the regulation of the terminal voltage to the required value. Simulation results are given to demonstrate the effectiveness of the proposed controller for the transient stabilization and voltage regulation.