• Title/Summary/Keyword: Emergency generator

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Improvement of Transient Characteristics of Brush-less Type Synchronous Generator for Emergency Driven by Internal-Combustion Engine (내연기관 구동 비상용 브러시리스형 동기발전기의 과도특성 개선)

  • An, Young-Joo
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.4
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    • pp.268-272
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    • 2016
  • A brush-less type synchronous generator is driven by an internal-combustion engine that is used for emergency source. This kind of generator has to maintain output voltage in a range of some degree under the abrupt load irregular conditions such as a full load trip. This paper suggests a suppression method of increasing the output voltage over the rating. Automatic voltage regulator detects excessive rising of output voltage of the generator and supplies the signals to a switch installed in the rotating exciter through the photo-coupler. The current of main field rapidly decreases by additional resistor of the main filed circuit. Therefore, the output voltage of the generator is maintained effectively. The experimental results verified that the excessive value of the output voltage is limited in the range of 7% of the rated voltage.

Preventive and Emergency Control of Power System for Transient Stability Enhancement

  • Siddiqui, Shahbaz A.;Verma, Kusum;Niazi, K.R.;Fozdar, Manoj
    • Journal of Electrical Engineering and Technology
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    • v.10 no.1
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    • pp.83-91
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    • 2015
  • This paper presents preventive and emergency control measures for on line transient stability (security) enhancement. For insecure operating state, generation rescheduling based on a real power generation shift factor (RPGSF) is proposed as a preventive control measure to bring the system back to secure operating state. For emergency operating state, two emergency control strategies namely generator shedding and load shedding have been developed. The proposed emergency control strategies are based on voltage magnitudes and rotor trajectories data available through Phasor Measurement Units (PMUs) installed in the systems. The effectiveness of the proposed approach has been investigated on IEEE-39 bus test system under different contingency and fault conditions and application results are presented.

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 the Emergency Generator Equipments Diagnosis System (비상용 발전설비 진단시스템 개발)

  • Lee, Sang-Cheol;Na, Chae-Dong;Lee, Seong-Beom;Yoo, Jae-Moon;Choi, Sik
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2590-2593
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    • 1999
  • This paper describes the development of Emergency Generator Equipments Diagnosis System for monitoring generator equipments and battery system. This system is capable of measuring on up to 20 separate sites of generator, engine and periphral equipment's. Battery system also capable of measure the setting time, float and discharge voltage of up to 240 cells in a single installation, and has the memory capacity to store battery's alarm data information on up to 200 separate sites. This system are easy to maintain and attain cost effectively, so that prepared for meeting the customer's service needs immediately. The system is additionally programmed with a each model, that will enable to accurately determine the generator equipments and remain battery capacity in a system following a short discharge test. It is also equipped with remote interrogation and control facilities.

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Unified Controller for 100kVA Emergency Generator (100kV급 비상발전기용 통합제어기)

  • Jeong, C.Y.;Cho, J.G.;Baek, J.W.;Lee, J.J.;Kim, Y.J.;Yoo, D.W.
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2801-2803
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    • 1999
  • An unified controller for emergency generator is presented to control AVR and Governor and l00kVA power conditioner. This controller is operated to compensate current harmonics and asymmetries caused by nonlinear load and unbalance loads. The power conditioner shapes the source current sinusoidal in phase with source voltage and allows the generator to maximum power even to the single phase load. Also this power conditioner allows that three phase generator synchronizes with single phase main source and load sharing. An l00kVA generator system was built and the unified controller is realized with DSP(TMS320C32PCMA). Experimental results for many load conditions are presented to verify the performance of the unified controller.

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Emergency Brushless Synchronous Generator Having Rotating Exciter Status Monitoring and Protection Functions

  • Oh, Yongseung;Oh, Wonseok;Cho, Kyumin
    • Journal of Advanced Information Technology and Convergence
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    • v.10 no.2
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    • pp.1-13
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    • 2020
  • This paper presents an emergency brushless synchronous generator having rotating exciter status monitoring and protection functions. For monitoring the rotating exciter status, a wireless rotor status detector and a digital AVR(Automatic Voltage Regulator), which has a wireless communication capability, are proposed. The proposed rotor status detector detects temperatures of exciter armature and main field windings and input voltage and current of the main field. Therefore, it is possible to protect the generator from the over-temperature of windings and detect the exciter bridge diode fault. Furthermore, the proposed digital AVR has rotor status monitoring and protection function, and remote generator tuning, wireless group parallel operation function. So the operator can efficiently operate the generator using a smartphone from a remote area.

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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    • 2007.04a
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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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A Study on Operation Scheme of STS with Emergency Generator for Peak Shedding (첨두부하 저감을 위한 비상발전기 연계형 STS 운영 방안에 관한 연구)

  • Kim, Chang-Hwan;Rhee, Sang-Bong;Kim, Kyu-Ho
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.155-156
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    • 2015
  • Recently, electricity consumption has rapidly increased along with economic growth. The operating strategy using emergency generator is aimed, to resolve a demand response management. For strategy of peak shedding using emergency generator, it is essential to introduce the fast transfer switching device. One of the most effective solutions is to use a static transfer switch (STS) based on thyristor. However, the characteristic of natural commutated SCR thyristor should anticipate short duration voltage sag. STS system thus requires more than a quarter cycle to successfully complete transfer process. This paper proposes the operation scheme of the STS system using the forced-commutation technique to mitigate instantaneous voltage sag during peak transfer process. Proposed STS system improved turn-off characteristic thus accomplishes the peak load shedding satisfied power quality. Performance of the proposed STS system is evaluated using electromagnetic transient program (EMTP) to confirm the effectiveness.

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Governor upgrade for PWR NPP safety related Emergency Diesel Generator (경수로형 원자력 안전등급 비상디젤발전기)

  • Kim, Yoon Sik;Jeon, Il-Young;Song, Dong-Young;Kim, Chang-Kook;Sim, Su-Il
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.293-298
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    • 2005
  • The following is final report for governor upgrade for PWR NPP safety related EDG Kori NPP No.2 Unit. The upgraded system includes more beneficial function like as "Slow start with starting ramp", "Generator load sensing & control capability" and "Emergency ramp during slow start". This paper show functional operation of slow start regime according to NRC regulatory guide which guide regulation to NPP safety related environment.

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Seismic Risk Evaluation of Isolated Emergency Diesel Generator System (면진된 비상디젤발전기의 지진위험도 평가)

  • Kim, Min-Kyu;Ohtori, Yasuki;Choun, Young-Sun
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.217-222
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    • 2007
  • An Emergency Diesel Generator (EDG) is one of the safety related equipments of a Nuclear Power Plant. The seismic capacity of an EDG in nuclear power plants influences the seismic safety of the plants significantly. A recent study showed that the increase of the seismic capacity of the EDG could reduce the core damage frequency (CDF) remarkably. It is known that the major failure mode of the EDG is a concrete coning failure due to a pulling out of the anchor bolts. The use of base isolators instead of anchor bolts can increase the seismic capacity of the EDG without any major problems. This study introduces a seismic risk analysis method and presents sample results about the seismically isolated and conventional EDG system.

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