• Title, Summary, Keyword: Exciter power supply

Search Result 13, Processing Time 0.042 seconds

Self-Starting Excitation System with Low-Power Permanent Magnet Generator

  • Cho, Chong Hyun;Lee, Dong-Hee
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.6
    • /
    • pp.2268-2275
    • /
    • 2018
  • This paper presents a high-efficiency low-power permanent magnet (PM) generator for the power supply of the generator exciter. In the conventional generator system, the power for the exciter is fed by the generator output power or an emergency battery for the starting. The proposed low-power PM generator can generate the proper power and voltage to excite the exciter field winding. According to the starting of the generator, the designed PM generator can supply the constant voltage to the Automatic Voltage Regulator (AVR), then it can be used to control of exciter field current for the generator. Because of the designed PM generator which is placed inside the conventional generator system, the emergency battery and Potential Transducer(PT) for AVR can be removed. Thus, the total efficiency can be improved. The proposed generator system is tested in the practical system. And the efficiency characteristic is analyzed.

Voltage Control of a Synchronous Generator for Ship using a Compound Type Digital AVR (혼합형 디지털 자동 전압 조정 장치를 이용한 선박용 동기발전기의 출력전압제어)

  • Park, Sang-Hoon;Lee, Sang-Seuk;Yu, Jae-Sung;Lee, Su-Won;Won, Chung-Yuen
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.58 no.4
    • /
    • pp.397-403
    • /
    • 2009
  • In this paper, an exciter current control of a synchronous generator for ships using a compound type digital automatic voltage regulator (DVAR) in order to provide a constant output voltage of the generator is presented. The compound type DAVR is composed of a controller part to adjust output voltage and an power source unit to supply power to the exciter. The controller part, which generates the PWM switching pattern via the PI controller, drives a power MOSFET for bypass to limit the SG's exciter current. The power source unit part is parallel connected to an output terminal of the generator through a reactor and a power CT. The residual magnetic flux of SG provides exciter current to the exciter through the reactor during the initial running or no load state and load current supplies field current to the exciter through the power CT during loading state. This paper confirmed an experiment to verify the validity of compound type DAVR system for controlling output voltage of synchronous generator.

The Development of EPSM(Exciter Power Supply Module) Localization in Generator Exciter(EX2100) System (발전기 여자기시스템 주제어전원공급장치 국산화 개발)

  • Lee, Ki-Seon;Park, Jung-Cheul;Chu, Soon-Nam
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.65 no.2
    • /
    • pp.101-107
    • /
    • 2016
  • The main target in this paper is the localization of VME Type EPSM in Generator Exciter(EX2100) System. Developed EPSM has the compatibility with the existing product in the structure and shape and electrical feature and so on, but it has a much improved capacity and reliability in comparison with origin company product. this paper, to improve these functions, put emphasis on protection, monitoring, power capacity increase(over 120%), an enlarged scale of input voltage supply, AC/DC dual voltage use and so on. After manufacturing product localization, it was carried out several tests for the performance and reliability verification of developed product. These tests were performed in Authorized Inspection Agency(KTL) and field application test and maker self-test were additionally performed. Finally, the results of all tests were "success".

Dynamic Performance of HVDC According to Excitation System Characteristics of Synchronous Compensator in a Weak AC System (약한 AC 계통에서 동기조상기용 여자 시스템 특성에 따른 HVDC 과도 특성)

  • Kim, Chan-Gi;Kim, Jeong-Bu;Sim, Eung-Bo
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.49 no.6
    • /
    • pp.431-440
    • /
    • 2000
  • This paper analyses the dynamic performance of HVDC System connected to a weak AC system for various exciter characteristics of synchronous machines connected at the converter bus. Conventionally capacitors are used to supply reactive power requirement at a strong converter bus. But the installation of synchronous machine is essential in a isolated weak network to re-start after a shutdown of HVDC and to increase system strength. The dynamic performance of a synchronous machine depends on the characteristics depends of its exciter. In this paper, several exciter types are used to investigate their effect on the dynamic performance of the HVDC system and modifications to standard exciter topologies are suggested to mitigate observed problems.

  • PDF

A Design and Voltage Control of a High Efficiency Generator with PM Exciter (고효율 영구자석 여자기 구조의 발전기 설계와 전압제어)

  • Jo, YeongJun;Lee, Dong-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.11
    • /
    • pp.1827-1834
    • /
    • 2016
  • This paper presents a high efficient generator with PM(Permanent Magnet) exciter. The proposed PM exciter for the generator can produce a linear output voltage according to the engine speed. This output voltage is directly used to control the field current of the generator to adjust the generator output voltage. In the proposed generator system, since the field winding current can be supplied by the PM exciter, the generator can self-start without any battery or an external power supply due to the low residential flux. Furthermore, the operating efficiency of the generator is higher than a conventional winding exciter. The main problem of the proposed generator system, the field winding current controller has to be embedded inside the generator, and it rotates according to the generator shaft. In this paper, the proper embedded current controller is designed for the proposed generator system. Due to the embedded controller cannot be connected to the outside the generator controller, the measured instantaneous output voltage of the generator is transferred by the photo isolated communication using shaft aligned infrared transmitter and receiver to keep the constant generator output voltage. In this paper, 10kW, 380V engine generator with PM exciter and the embedded DAVR(Digital Automatic Voltage Regulator) are described. The proposed high efficiency generator is simulated and tested to verify the effectiveness.

Characteristic Analysis and Experiments on Components of Low-Tc Power Supply (저온초전도전원장치의 시스템 특성해석 및 요소실험)

  • 윤용수;주민석;고태국
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.53 no.2
    • /
    • pp.76-81
    • /
    • 2004
  • This paper deals with characteristic analysis and experiments on components of low-Tc(LTS) power supply. A LTS power supply consists of two exciters, a rotor, a stator, and an LTS magnet. The power supply has eight rotating poles, which make rotational magnetic flux. These flux penetrate superconducting sheets and cause currents which charge an LTS load. In this experiment, a 25.8mH LTS magnet was used, and rotor revolutions from 30 to 300rpm were used. In order to measure the pumping-current with respect to the magnet flux changes, a hall sensor was installed at the center of the LTS magnet. The experimental observations have been compared with the theoretical predictions. In this experiment, the pumping-current has reached about 372A.

Vibration Characteristics for 11.4 MW Class Marine Generator using Rigid Support (고정지지를 갖는 11.4 MW급 선박용 발전기의 진동 특성)

  • Dao, Vuong Quang;Barro, Ronald D.;Kim, Hyojung;Lee, Donchool
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.585-588
    • /
    • 2013
  • Electric motor with reduction gear systems are being adopted recently as main propulsion on the special-purposed ships. These specialized ships or offshore vessels require higher power rating generators for propulsion and accommodation power supply. This study investigated the cause of exciter components failure in the view of excessive vibration, force or abnormal ship motion in service. Countermeasures are proposed to address the exciter component failure. A 1.4 MW class dual-fuel engine generator using rigid foundation for a LNG carrier was used as research model.

  • PDF

Dynamic Performance of HVDC according to Excitation System Characteristics of Synchronous Compensator in a Weak AC System (약한 계통에서 동기조상기의 여자 시스템에 따른 HVDC 시스템의 과도 성능 분석)

  • 김찬기
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.5 no.4
    • /
    • pp.318-326
    • /
    • 2000
  • This paper analyses with the dynamic performance of HVDC System connected to a weak AC system for varying exciter characteristics of synchronous machines connected at the converter bus. Conventionally capacitors are used to supply reactive power requirement at a strong converter bus. However the installation and synchronous machine is essential in a isolated weak network to re-start after a shutdown of HVDC and to increase strength. The dynamic performance of a synchronous machine depends on the characteristics depends on its exciter characteristics. In this paper, several excites types are used to investigate their effect on the dynamic performance of the HVDC system and modifications to standard exciter topogical are suggested to mitigate observed problems.

  • PDF

Design and Control of a high efficiency hybrid PM generator (고효율 하이브리드 영구자석 발전기의 설계 및 제어)

  • Jo, YeongJun;Park, JunHwi;Kim, Seungjun;Lee, Dong-Hee
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.57-58
    • /
    • 2017
  • This paper proposes a high efficiency hybrid generator which has a winding and PM(Permanent Magent) field together. The PM field can supply the enough flux to generate the no-load output voltage, and the field winding current can supply the flux to compensate the voltage drop from the load. Furthermore, the PM exciter can supply the enough power for the field of the generator. The detailed design and the FEM analysis are presented to verify the proposed hybrid generator. Then the experimental results shows the effectiveness of the proposed system.

  • PDF

Analysis of the Operational Characteristics of Superconducting Power supply Considering the structure of the Sheets (박막구조에 따른 초전도전원장치의 동작특성 해석)

  • Kim, Ho-Min;Yoon, Yong-Soo;Ahn, Min-Cheol;Ko, Tae-Kuk;Han, Tae-Su;Oh, Sang-Soo
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.50 no.4
    • /
    • pp.164-169
    • /
    • 2001
  • This paper deals with comparison of characteristics of continuous-sheet type low-Tc superconducting (LTS) power supply and discrete-sheet type LTS power supply. These characteristics have been analyzed through experiments. These power supplies consist of two exciters, a rotor, a stator, and a LTS load. A continuous-sheet type has a single continuous niobium (Nb) sheet attached to the inner surface of on the stator. In the case of discrete-sheet type, four separated Nb sheets are used. this experiment is using 1.81 mH LTS magnet load and maximum 30 A dc exciter current. A discrete-sheet type is expected to produce much better pumping rate than a continuous-sheet type. The experimental observations have been compared with the theoretical predictions. In this experiment, the maximum pumping-current has reached about 926 A.

  • PDF