• Title/Summary/Keyword: PMG (Permanent Magnet Generator)

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Voltage Control of Synchronous Generator for Ship Using a PMG Type Digital AVR (PMG Type 디지털 AVR을 이용한 선박용 동기발전기 출력전압제어)

  • Yu, Dong-Hwan;Park, Sang-Hoon;Yu, Jae-Sung;Lee, Sang-Suk;Kim, Young-Real;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.136-138
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    • 2008
  • The output voltage of synchronous generator is regulated constantly by field current control in excitation system. Most of ship generator exciter system uses the thyristor phase controlled rectifier. However this rectifier is difficult to realize that the speed control system because its control period is slower than MOSFET and IGBT type converter. Therefore, this paper deals with PMG(Permanent Magnet Generator) type digital excitation system using MOSFET for ship synchronous generator. The organization of this excitation system is very simple. When the generator is under the short circuit accident, the output voltage becomes zero state and AVR can not operate. Thus generator requires the function for flowing output current through CBS. The performance of the proposed system is evaluated on a 10kVA experimental prototype circuit in place of real ship generator.

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Development Status of 3MW Class Offshore Wind Turbine (3MW급 해상 풍력발전시스템 개발현황)

  • Joo, Wan-Don;Park, Jeung-Hun;Choi, June-Hyug;Lim, Chae-Wook;Park, Jong-Po
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.366-369
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    • 2007
  • This paper presents the general results of the conceptual design of a 3MW class offshore wind turbine named WinDS 3000 under development. In WinDS 3000, an integrated drive train design, three stage gearbox and permanent magnet generator (PMG) with fully rated converters have been introduced. A pitch regulated variable speed power control with individual pitch control has been adopted to regulate rotor torque while generator reaction torque can be adjusted almost instantaneously by the associated power electronics. Through the introduction of WinDS 3000, it is expected that helpful to understanding of the development status of 3MW offshore wind turbine.

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Voltage Control of Synchronous Generator for Ships using a PMG Type Digital Automatic Voltage Regulator (PMG Type 디지털 AVR을 이용한 선박용 동기발전기 출력전압제어)

  • Yu, Dong-Hwan;Park, Sang-Hoon;Won, Chung-Yuen;Yu, Jae-Sung;Lee, Sang-Seuk;Ahn, Sung-Joon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.1
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    • pp.38-45
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    • 2009
  • To get the constant output, synchronous generator field excitation is controlled by AVR(Automatic Voltage Regulator). Most of ships generator AVR uses the thyristor phase controlled rectifier. However this rectifier is difficult to realize that the fast control system because its control period is slower than MOSFET and IGBT type converter. Therefore, this paper deals with PMG(Permanent Magnet Generator) type digital AVR using MOSFET switch for ships synchronous generator. The composition of this digital AVR is very simple, the generator is under the short circuit accident, the output voltage becomes zero state and AVR can not operate. Thus generator is required to add CBC(Current Boosting Circuit) in an excitation circuit to flow output current. The performance of the proposed system is evaluated on a 10[kVA] experimental prototype circuit in place of real ships generator.

DC Bus Voltage Regulation With Six-Step Operation in Maritime DC Power System (식스 스텝 운전을 이용한 선박용 DC 전력 시스템의 직류단 전압 제어)

  • Yun, Jonghun;Son, Young-Kwang;Sul, Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.4
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    • pp.263-270
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    • 2021
  • Active AC/DC converters with PWM operation are utilized to regulate rectified DC bus voltage of a permanent magnet synchronous generator in the maritime DC power system. A DC bus voltage regulation strategy that exploits the six-step operation is proposed in this study. Compared with that of the PWM operation, switching loss of the converter can be significantly reduced under the six-step operation. Moreover, conduction loss can also be reduced due to the high modulation index and reduced flux-weakening current of the six-step operation. A controller is used for the proposed DC bus voltage regulation strategy to verify its validity with the simulation and experimental setup. The simulation and the experimental test results showed that the converter loss reduces to a maximum of 70% and 19%, respectively.

A Case of Changing Excitation System as the Load Characteristics (부하특성에 따른 동기발전기 여자시스템 변경 사례)

  • Kim, Jong-Seo;Cheon, Young-Sig;Park, Yun-Chool;Im, Yeong-Chul
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.2037_2038
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    • 2009
  • 공장 단독부하에 전력을 공급하고 있는 디젤발전소에서, 자여자 방식으로 적용된 여자시스템이, 부하변동이 심하여 전압동요가 빈번하게 발생하는 곳에서 적용하기에 부적합한 것으로 판명되었고, 이에 PMG(Permanent Magnet Generator)를 이용한 타여자 방식의 여자시스템으로 변경하여 정상화 시킨 정비사례임.

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Experimental Verification and Prediction of Generating Performance of PMG with Multi-Pole Rotor based on Electromagnetic Analysis and Parameter Estimation considering Skew Effects (스큐를 고려한 다극 영구자석 발전기의 전자기 특성해석/제어정수 도출을 통한 발전특성 예측 및 실험적 검증)

  • Jang, Seok-Myeong;Choi, Jang-Young;Ko, Kyoung-Jin;Park, Ji-Hoon;Lee, Sung-Ho;Kim, Ii-Jung
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.752-753
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    • 2008
  • The analytical expressions for magnetic field distributions considering slotting effects, cogging torque and back-emf considering skew effects are established. On the basis of magnetic field solutions, electrical parameters such as back-emf constant and winding inductance are obtained. The predicted results are validated extensively by non-linear finite element (FE) analyses. In particular, test results such as back-emf, cogging torque, inductance and resistance measurements are given to confirm the analyses. Finally, generating performances are investigated by applying estimated parameters to equivalent circuit (EC) of the permanent magnet generator (PMG) and validated extensively by FE calculations and measurements.

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