• Title, Summary, Keyword: Excitation System

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A Study on an AVR Parameter Tuning Method using Real-lime Simulator (실시간 시뮬레이터를 이용한 AVR의 파라미터 튜닝에 관한 연구)

  • Kim, Jung-Mun;Mun, Seung-Il
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.2
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    • pp.69-75
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    • 2002
  • AVR parameter tuning for voltage control of power system generators has generally been performed with the analytic methods and the simulation methods, which mostly depend on off-line linear mathematical models of excitation control system. However, due to the nonlinear nature of excitation control system, excitation control system performance of the tuned Parameters using the above conventional tuning methods may not be appropriate for some operating conditions. This paper presents an AVR parameter tuning method using actual on-line data of the excitation control system with the parameter optimization technique. As this method utilizes on-line operating data of the target excitation control system not the mathematical model of the system, it can overcome the limitation of model uncertainty Problems in conventional method, and it can tune the AVR parameter set which gives desired performance at the operating conditions. For the verification of proposed tuning method, two case studies with scaled excitation systems and the real-time power system simulator are presented.

The Study on Equipment Qualification of Emergency Diesel Generator Excitation Control System for Nuclear Power Plant (I) (원전 디젤발전기 여자시스템 기기검증시험에 관한 연구(I))

  • Lee, Joo-Hyun
    • Proceedings of the KIEE Conference
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    • pp.143-145
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    • 2007
  • The development of excitation control system (ECS) for emergency diesel generator in nuclear power plant is the replacement project of existing control system to resolve the maintenance problems caused by aging and obsolescence, The excitation control system is classified as a safety-related system. To guarantee the performance of developing excitation control system is equal to or higher than that of other systems, establishing the quality assurance scheme, doing software verification and validation activities, and planning equipment qualification. In this paper, we'd like to introduce the equipment qualification of excitation control system.

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Development of the Triple Modular Redundant Excitation System with Simulator for 500MW Synchronous Generator (500MW 동기발전기용 시뮬레이터 탑재형 디지털 삼중화 여자시스템 개발)

  • Ryu, Hoseon;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.1
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    • pp.70-75
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    • 2014
  • TMR(triple modular redundant) digital excitation system with simulator is developed for tuning optimal control parameters during commissioning test and coping with system faults rapidly. A new system which mocks up virtual generator, turbine, grid can simulate as if excitation system is connected to a real generator system by setting four switches. The maintenance crew using the simulator is able to test perfectly the phase controller rectifiers, field breaker, sequence relays as well as TMR controller of the excitation system. Commissioning and performance results about the excitation system with simulator is discussed. The trial product was installed and operated at a 500MW thermal power plant after the commissioning test.

Developing the Excitation Testing Module with LabVIEW (LabVIEW를 이용한 Exciter 가진시험 모듈 개발)

  • Choi, Ki-Soo;Jung, Wei-Bong;Won, Sung-Gyu;Ahn, Se-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.37-41
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    • 2007
  • Fast Fourier Transformation(FFT) is one of the most useful way to analyze response signal for the purpose of grasping the dynamic characteristics of system. Excitation is a factor or process making noise or vibration. It's typical and simple experimental method widely used for catching hold of dynamic peculiar characters and modal behaviors of system by frequency analysis. There are harmonic excitation, impact excitation, random excitation, sweep excitation, chirp excitation and so on as the ideal method in an experiment using exciter. In this thesis, excitation testing module for NI-PXI equipment is developed. The analyzing module is developed with LabVIEW tool. A user can generate each waveform for shaking a structure and see quickly and easily modal shape of system with this module. This developed module will be expected to build up more convenient and serviceable measurement system.

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A Study on Excitation System for Synchronous Generator using Current Mode Controlled PWM Converter (전류제어형 PWM컨버터를 이용한 동기발전기용 여자시스템에 관한연구)

  • 장수진;류동균;서민성;김준호;원충연;배기훈
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.151-156
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    • 2002
  • The output voltage of Synchronous Generator is regulated constantly by field current control in excitation system. A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the constant output voltage under normal operating conditions about various levels. High frequency PWM converter (Current Mode Control Buck converter) type excitation system for synchronous generator is able to sustain output voltage level properly when the fault condition happened. This paper deals with the design and evaluation of the excitation system controller for a synchronous generator to improve the steady state and transient stability. The simulation and experimental results show that the proposed excitation system is improve the respons time by the AVR(automatic voltage regulator) of 50kW synchronous generator that is applied the current mode control excitation system.

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EXCITATION SYSTEM MODERNIZATION OF THERMAL POWER PLANT

  • Kim, Chan-Ki;Kim, Jang-Mok;Rhew, Ho-Sun
    • Proceedings of the KIEE Conference
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    • pp.2024-2026
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    • 1998
  • Many power plants built 20-30 years ago are facing problems associated with the excitation system used for controlling generator output voltage. After years of reliable operation, generation is experiencing increased down time due to maintenance associated with the exciting excitation equipment. Reliability of the excitation system has become an issue, especially where many of these generation plants may be critical to the internal processes used for manufacturing. Wear out mechanisms such as those associated with the wire wound rheostat the electromechanical voltage regulator, insulation failures of the rotating exciter and commutator deterioration have become real problems typical of many older installations. These are some of the issues that are affecting system reliability for older power plants. This paper will address typical problems associated with the old excitation systems and the justification for a replacement static excitation system used in many Paper Mills.

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The Development of Digital Excitation Control System for Diesel Generator of Nuclear Power Plant and Its Application (원자력발전소 디젤발전기 디지털 다중화 여자시스템 개발 및 적용)

  • Lee, Joo-Hyun;Lim, Ik-Hun;Shin, Man-Su;Jeong, Tae-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.8
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    • pp.1449-1455
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    • 2010
  • The excitation control system of an emergency diesel generator is classified as a kind of safety-related system. Compared with other control systems in a power plant, this system is required to be more reliable and have better performance. In this paper, the digital multi-redundant excitation system for a diesel generator was proposed. The signal processing system of the proposed system makes high speed signal processing and arithmetic in excitation control possible. The improved soft start algorithm and multiple PI parameters adaptation considering the diesel generator characteristics were implemented in the proposed system. The developed system was applied to a nuclear power plant successfully.

Development of Excitation System for Class 1E (Class 1E용 여자시스템 개발)

  • Shin, Man-Su;Lee, Joo-Hyun;Ryu, Ho-Seon;Lim, Ick-Hun;Jeong, Tae-Won
    • Proceedings of the KIEE Conference
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    • pp.1953-1954
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    • 2008
  • The excitation system for class 1E has been developed to apply to the nuclear power plant emergency diesel generator by utilizing the existing digital excitation system. The additional mission was to evaluate the excitation system of safety. It is the safety analysis of the excitaton system, the verification test, the aging test, the safety requirement test and so on. The verification test is classified of hardware and software part for detail.

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Performance Analysis for the Modified Excitation System of Synchronous Machine Connected to HVDC System

  • Kim, Chan-Ki
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.2B no.3
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    • pp.109-114
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    • 2002
  • This paper analysis the transient performance of the modified excitation system using 4-quadrant chopper for a synchronous machine connected to HVDC system. Conventionally, capacitors are used to supply reactive power requirement at a strong converter bus. And the installation of a synchronous machine is essential in an isolated weak network to re-start after a shutdown of HVDC and to increase the system strength. However, a conventional static excitation system has some problems which are harmonic instability and the system stress due to overvoltage. To reduce these problems, the new excitation system, which has 4-quadrant chopper, is proposed. As the proposed system provides the capability to allow reverse current and isolate between AC network and excitation power, problems of overvoltage and harmonic instability can be solved. The investigation is performed and confirmed by the time domain digital simulation using PSCAD/EMTDC program.

Experimental Study of Triple Redundancy Static Excitation System for Power Plant (발전소 발전기용 삼중화 정지형 여자시스템에 관한 연구)

  • Baeg, Seung-Yeob;Nam, Jung-Han;Kim, So-Hyung;Kang, Sung-Su
    • Proceedings of the KIEE Conference
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    • pp.806-809
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    • 2003
  • Digital controllers have developed rapidly in recent years. This paper describes the synchronized signal generation circuits for control of Multiple Controllers and test results. Also this paper describes configuration and functions of digital excitation system. The digital excitation system is made up of triple redundancy and has control and protection functions.

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