• Title/Summary/Keyword: Shaft Generator

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Modeling and Simulation of a Tugboat's Shaft Generator for HILS Testing (HILS 테스트를 위한 터그보트의 샤프트제너레이터 모델링 및 시뮬레이션)

  • Kim, Sung-Dong;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.05a
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    • pp.216-219
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    • 2021
  • In the Eco-Friendly Ship Act, the shaft generator is an equipment for eco-friendly ships. However, in order to apply the new technology in ships, high reliability is required, and the HILS (hardware in loop system) test is used as a verification method for this. Therefore, in this paper, a shaft generator is modeled and simulated for HILS test of a tugboat to which a shaft generator is applied. Through simulation, it was verified that the charging/discharging of the shaft generator operates according to the scenario.

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Realization of Torsional Response based on Multi-mass Modeling of Turbine-Generator Shaft System (터빈 발전기 축 시스템의 다중 질량체 모델링을 통한 비틀림 응답 구현)

  • Park, Ji-Kyung;Cho, Gyu-Jung;Sohn, Seung-Hyun;Chung, Se-Jin;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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    • pp.201-207
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    • 2015
  • Turbine-generator torsional response is caused by interaction between electrical transient air-gap torque and mechanical characteristics of turbine-generator shafts. If torsional shaft torque exceeds a certain threshold, the loss of fatigue life may occur and, in the end, it is possible to happen permanent shaft failure. Therefore, it is required to understand the torsional response for reliable operation and protection of turbine-generator shaft system. In this paper, we introduced multi-mass modeling method of turbine-generator shaft system using mechanical-electrical analogy and state-space equation to verify the transient torsional response based on ElectroMagnetic Transient Program (EMTP). These simple realization methods for turbine-generator shaft torsional response could be helpful to understand torsional interaction phenomena and develop the transient torque reduction countermeasures for turbine-generator shaft system.

Development of a Reclosing Scheme for Reduction of Turbine Generator Shaft Torsional Torques: A Decision Method to Achieve Optimal Reactor Capacity

  • Oh, Yun-Sik;Seo, Hun-Chul;Yang, Jeong-Jae;Kim, Chul-Hwan
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1145-1153
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    • 2014
  • It is well known that line switching operations like reclosing are able to cause transient power oscillations which can stress or damage turbine generators. This paper presents a reclosing scheme to reduce the shaft torsional torques of turbine generators by inserting an additional reactor. A novel method to determine optimal reactor capacity to minimize the torsional torque generated in a turbine generator is also proposed. In this paper, the turbine generator shaft is represented by a multi-mass model to measure torsional torques generated in the shaft between the turbine and the generator. Transmission systems based on actual data from Korea are modeled to verify the proposed scheme using ElectroMagnetic Transient Program (EMTP) software. The simulation results clearly show the effectiveness of the proposed scheme and torsional torque can be minimized by applying the proposed scheme.

Microcomputer-Based Constant Frequency Control of Generating System Driven by Hydraulic Power -Pump Displacement Control Type - (마이크로컴퓨터에 의한 유압구동식 발전장치의 정주파수 제어)

  • 정용길;이일영;김상봉;양주호
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.2
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    • pp.53-63
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    • 1991
  • This study suggests a new type shaft generator driven by hydraulic power suitable for small size vessels. Since the shaft generator system is very easy to be affected by disturbances such as speed variation of main engine and load variation of the generator, a robust servo control must be implemented to obtain stable electric power with constant frequency. Thus, in this study two types of controller design method-the reference following optimal control method and robust servo control method-are adopted to the controller design. In the experiment, static and dynamic characteristics of the shaft generator system according to the variation of input frequency setting, the speed variation of the pump and the load variation of the generator are investigated. From the considerations on the computer simulation results and experimental results, it is ascertained that the shaft generator system proposed in this study has good control performances.

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Fatigue life Evaluation of Rib Weldment for Generator Shaft (회전기 shaft의 rib 용접부 피로수명 평가)

  • Yun Jung-Geun;Kim Hyeon-Su;Hwang Ju-Hwan
    • Proceedings of the KWS Conference
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    • 2006.05a
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    • pp.83-85
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    • 2006
  • The purpose of this study is to evaluate the fatigue life at the rib weldment of generator shaft. In order to do it, the stress distributions at the weldment under design loading condition were evaluated using FEA and analytical approach. The fatigue strengths of the as welded and toe machined rib specimen were estimated using 3-points bending fatigue test. Based on the fatigue test results, the S-N curve far the rib weldment of the generator shaft with post treatment was established.

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Analysis of Turbine-Generator Shaft System Mechanical Torque Response based on Turbine Blade Modeling (터빈 블레이드 모델링을 통한 터빈 발전기 축 시스템의 기계적 토크 응답 분석)

  • Park, Ji-Kyung;Chung, Se-Jin;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.9
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    • pp.1269-1275
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    • 2015
  • Turbine-generator torsional response is caused by interaction between electrical transient air-gap torque and mechanical characteristics of turbine-generator shafts. There are various factors that affects torsional interaction such as fault, circuit breaker switching and generator mal-synchronizing, etc. Fortunately, we can easily simulate above torsional interaction phenomena by using ElectroMagnetic Transient Program (EMTP). However, conventional EMTP shows the incomplete response of super- synchronous torsional mode since it does not consider turbine blade section. Therefore, in this paper, we introduced mechanical-electrical analogy for detailed modeling of turbine-generator shaft system including low pressure turbine blade section. In addition, we derived the natural frequencies of modeled turbine-generator shaft system including turbine blade section and analyzed the characteristics of mechanical torque response at shaft coupling and turbine blade root area according to power system balanced/unbalanced faults.

A Study for the Shaft Vibration of the Vertical Type Hydro Electric Power Generator (수축형 수차발전기 축진동에 관한 연구(I))

  • 이승원
    • 전기의세계
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    • v.13 no.3
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    • pp.28-37
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    • 1964
  • It is the intention of this thesis to discriminate and investigate the cause of the shaft vibration of the vertical type hydroelectric power generator with respect to electrical, mechanical and hydraulic aspects, and to analyze the vibration which will occure by the each cause investigated above. In order to test the shaft vibration of No.1 generator in Hwachon, Korea new measurement method and measuring equipments were designed. In practice the shaft vibration of the generator was measured by above equipments and analyzed by the discriminative method. Detailed explanation for the designed measurement method and instruments is presented, and the results which I had tested three times for the generator No.1 in Hwachon power plant are added. As a appendix the mechanism and causes of the thrust bearing's wear and remarks for the runner are written.

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The Optimal Design Technique for Improving Durability of Spline Shaft of the Self Propelled Artillery' Generator (자주포 발전기 스플라인 축 내구성 향상을 위한 최적 설계 기법)

  • Kim, Byeong Ho;Kang, Hyen Jae;Park, Young Il;Seo, Jae Hyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.5
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    • pp.485-491
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    • 2015
  • In this study, the experimental and analytical investigation on structural integrity evaluation of spline shaft of self propelled artillery' generator were carried out. For this work, macro and microstructure fractography of spline shaft were observed. According to the results of the structure analysis and simulation, the shaft was redesigned and optimized. To improve the stiffness and shear stress, the material was changed from the SNCM220 to SNCM439 and surface roughness and protective coating treatment are changed to increase the stress relaxation, respectively. From the result of the torsion test of shaft and accelerated life test of generator, the shaft of a SNCM439 with heat-treatment(Q/T) and electroless nickel plating was superior quality reliability and durability than the others. Therefore, modeling and simulation corresponded well with the experimental result and structural safety was confirmed by generator performing.

Prediction of 2X Vibration of a Generator Rotor with Asymmetric Shaft Stiffness (비대칭 축 강성을 가지는 발전기 회전자의 2X 진동 예측)

  • Park, C.H.;Kim, Y.C.;Cho, K.G.;Yang, B.S.
    • Journal of Power System Engineering
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    • v.11 no.1
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    • pp.16-19
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    • 2007
  • The large generator rotor used in fossil power plant has the possibility of high 2X vibration due to asymmetric shaft stiffness. The generator rotor is machined into pole faces to reduce stiffness difference and then is tested through 2X vibration measurement when the balancing works are performed in the balancing shop. However, there are many cases of large difference values between 2X vibration in the balancing shop and 2X vibration in site. This paper presents a new method to estimate 2X vibration in site with more accuracy and applied for the retrofit of a fossil 400 MW class deteriorated generator. It shows that the new generator rotor is manufactured with a good 2X vibration characteristics and is operated in a low 2X vibration level although the generator rotor has high 2X vibration in the balancing shop.

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Studies on a Wind Turbine Generator System using a Shaft Generator System

  • Tatsuta Fujio;Tsuji Toshiyuki;Emi Nobuharu;Nishikata Shoji
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.177-184
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    • 2006
  • In this paper a new dc-link type wind turbine generator system using a shaft generator system, which is widely used for power sources in a ship, is proposed. The basic configuration of the proposed wind turbine generating system is first explained. And the equations expressing the system are derived. Then the steady-state characteristics of the generating system are discussed. We use an experimental system that can simulate the characteristics of a wind turbine in this study, because it is hard to operate an actual wind turbine in a laboratory. In addition, the transient responses of this system are investigated when the velocity of the wind is changed. It is shown that experimental results were very close to the simulated ones, supporting the usefulness of the theory.