• Title/Summary/Keyword: 터빈-발전기

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Development and Evaluation for the Insulated Coupling Test Machine of a Large Wind Turbine (대형 풍력터빈 절연커플링 시험장치 개발 및 평가)

  • Ju, Sung Ha;Kim, Dong Hyun;Oh, Min Woo;Kim, Su Hyun;Kang, Jong Hun;Bae, Jun Wu;Lee, Hyoung Woo;Kim, Kyung He
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.8
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    • pp.543-556
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    • 2016
  • In this work, an insulated coupling test machine for a 5-MW-class wind turbine was designed and developed, along with the public performance testing of a 3-MW-class wind turbine. The results of the device design, development requirements, functional considerations, structural vibration analysis, and the evaluation of the insulated coupling test machine are presented in this study. For the coupling models, thick fiberglass composite pipe insulation, fabricated by filament winding, was considered. Results of three-dimensional finite element analysis conducted using both solid element and shell element modeling were analyzed and compared, considering the effect of thickness. In addition, results from the nonlinear finite element analysis of multiple leaf springs of the laminated disk pack structure were verified and compared with experimental data.

A CAD/CAM System for Steam Paths of Turbine Generators (터빈발전기의 Steam Path 전용 CAD/CAM시스템)

  • Kim Y. I.;Kim D. S.;Jun C. S.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.4
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    • pp.254-261
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    • 2005
  • The purpose of this research is to develop a method for cutting non-circular holes on a bent thick plate. Generally in order to cut the holes on the large plates, a special-purpose 5-axis machine is needed. However, such a machine is unavailable in most of the machine shops. This paper provides a description of such a method that utilizes a general-purpose 5-axis water-jet machine in place of the special-purpose machine: First, the bent piece is transformed into a flat plate, where the shape of the holes is reconstructed by considering deformation during bending. Then, after a 5-axis NC data is generated, the holes on the flat plate are cut using the 5-axis water-jet machine. The final step is to return to its, original shape by bending the plate with its newly-cut holes. The proposed methodology is implemented as a dedicated system by customizing a commercial CAD/CAM system. Some illustrations are provided throughout the paper in order to show the validity of the proposed methods and the developed system.

Noise and flow analysis of lift-type disk wind power System (양력형 디스크 풍력 발전기의 유동 및 소음 해석)

  • Ko, Seungchul;Na, Jisung;Lee, Joon Sang
    • Journal of the Korean Society of Visualization
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    • v.15 no.3
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    • pp.52-56
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    • 2017
  • In this study, we investigate the flow characteristics of lift-type disk which behaves the up-down motion using the large eddy simulation (LES) and immersed boundary method (IBM). Also, we perform the noise analysis using pressure field at 1.35 m distance and reveal the cause of noise to observe the vortical structure analysis of flow result. It is observed that vortical structure and wind shear were generated at leading edge and tower with high velocity deficit and flow separation. High magnitude of flow noise was observed in low frequency range which is from 30 Hz to 60 Hz. It was observed that vortical structure at leading edge was generated in frequency range from 33.3 Hz to 41.6 Hz. Temporal characteristic in vortical structure at leading edge was similar to noise characteristics, having the similar frequency ranges.

Rotordynamic Analysis and Experimental Investigation of the Turbine-Generator System Connected with Magnetic Coupling (마그네틱 커플링으로 연결된 터빈-발전기 시스템의 로터다이나믹 해석 및 실험적 고찰)

  • Kim, Byung Ok;Park, Moo Ryong;Choi, Bum Seok
    • The KSFM Journal of Fluid Machinery
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    • v.16 no.3
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    • pp.32-38
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    • 2013
  • This paper deals with the study on the rotordynamic and experimental analysis of turbine-generator system connected with a magnetic coupling. Although magnetic coupling has been used to torque transmission of chemical processing pump rotating at under 3,600rpm, magnetic coupling in this study is applied to high-speed turbine-generator system using a working fluid that is refrigerant such as ammonia or R-124a. Results of rotordynamic design analysis are as follows. The first, shaft diameter nearest to outer hub of magnetic coupling has a big effect on the $1^{st}$ critical speed of generator rotor. The second, if the $1^{st}$ critical speeds of turbine rotor and generator rotor have enough to separation margin in comparison to rated speed, the $1^{st}$ critical speed of turbine-magnetic coupling-generator rotor train has enough to separation margin regardless of connection stiffness of magnetic coupling. The analytical FE model is guaranteed by impact test on the prototype and condition monitoring such as measurements of vibration and bearing temperature is also performed.

A Optimization of the ORC for Ship's Power Generation System (해수 온도차를 이용한 선박의 ORC 발전 시스템 최적화)

  • Oh, Cheol;Song, Young-Uk
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.5
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    • pp.595-602
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    • 2012
  • In this study, for the purpose of reduction of $CO_2$ gas emission and to increase recovery of waste heat from ships, the ORC (Organic Rankine Cycle) is investigated and offered for the conversion of temperature heat to electricity from waste heat energy from ships. Simulation was performed with waste heat from the exhaust gasse which is relatively high temperature and cooling sea water which is relatively low temperature from ships. Various fluid is used for simulation of the ORC system with variable temperature and flow condition and efficiency of system and output power is compared. Finally, 2,400kW output power is obtained by system optimization of the preheater and reheater utilizing waste heat form sea water cooling system.

Study on Enhancement of Data Processing Algorithm in SaaS Cloud Infrastructure to Monitor Wind Turbine Condition (풍력발전기 상태 감시를 위한 SaaS 클라우드 인프라 내 데이터 처리 알고리즘 개선 연구)

  • Lee, Gwang-Se;Choi, Jungchul;Kang, Minsang;Park, Sail;Lee, JinJae
    • New & Renewable Energy
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    • v.16 no.1
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    • pp.25-30
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    • 2020
  • In this study, an SW for the analysis of the wind-turbine vibration characteristics was developed as an application of SaaS cloud infrastructure. A measurement system for power-performance, mechanical load, and gearbox vibration as type-test class was installed at a target MW-class wind turbine, and structural meta and raw data were then acquired into the cloud. Data processing algorithms were developed to provide cloud data to the SW. To operate the SW continuously, raw data was downloaded consistently based on the algorithms. During the SW test, an intermittent long time-delay occurred due to the communication load associated with frequent access to the cloud. To solve this, a compression service for the target raw data was developed in the cloud and more stable data processing was confirmed. Using the compression service, stable big data processing of wind turbines, including gearbox vibration analysis, is expected.

The Minimization of Generator Output Variations by Impulse Chamber Pressure Control during Turbine Valve Test (터빈 밸브시험 중 충동실 압력제어에 의한 발전기 출력변동 최소화)

  • Choi, In-Kyu;Kim, Jong-An;Park, Doo-Yong;Woo, Joo-Hee;Shin, Jae-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.152-159
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    • 2010
  • This paper describes the actual application of a feedback control loop as a means for minimizing turbine impulse chamber pressure variation during the turbine steam valve tests at a 1,000 MW nuclear power plant. The chamber pressure control loop was implemented in the new digital control system which was installed as a replacement for the old analog type control system. There has been about 40MW of the generator output change during the steam valve tests, especially the high pressure governing valve tests, because the old control system had not the impulse chamber pressure control so the operators had to compensate steam flow drop manually. The process of each valve test consists of a closing process and an reopening process and the operators can make sure that the valves are in their sound conditions by checking the valves movement. The control algorithm described in this paper contributed to keep the change in megawatt only to 6MW during the steam valve tests. Thereby, the disturbance to reactor control was reduced, and the overall plant control system's stability was greatly improved as well.

A study on the Turbine-Generator Governor Dynamic Characteristic Testing System (터빈-발전기 조속기의 동특성 시험시스템 개발에 관한 연구)

  • Choi, Hyung-Joo;Lee, Heung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.10
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    • pp.1399-1411
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    • 2012
  • The grid frequency is controlled cooperatively by the governor of the Turbine-Generator and the automatic generation controller(AGC) of the KPX(Korea Power Exchange). It is a basic requirement that the reliability of the governor is verified to enhance the power system stability but it is not easy to confirm the response characteristics of the governor because all generators are operated in the grid system that has the constant voltage and frequency. Therefore, it is necessary to study a new test method in order to examine the governor dynamic characteristic in the similar fault conditions. A study has shown that it is verified to simulate the turbine-generator power control system, the governor response characteristic under limited conditions and contribution of AGC with the gas turbine generator simulation model as well as demonstrate the dynamic response of the governor with the developed governor dynamic characteristic tester based on digital controller while the turbine-generator is connected to the grid system. This tester is constructed by the built-in functions of the turbine-generator main controller. In this treatise, the theoretical background, development method and the results of both simulations and demonstrations are described as another way to verify the turbine-generator governor dynamic characteristics.

The Reduction of Generator Output Calculation by Using 6σ Method on Steam Turbine Simulator in a Nuclear Power Plant (6시그마 기법을 적용한 원자력 터빈 시뮬레이터의 발전기 출력 연산오차 저감)

  • Choi, In-Kyu;Kim, Jong-An;Park, Doo-Yong;Woo, Joo-Hee;Shin, Man-Su
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.1017-1022
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    • 2011
  • This paper describes the improvement of the calculation by using $6{\sigma}$ method on steam turbine simulator in a nuclear power plant. The simulator is essential to not only verification and validation of control logic but also making sure of control constants in upgrading the long time used control system into the new one. And the dynamic model is a key point in that simulator. The model used during the retrofit period of the turbine controller in Kori Nuclear Power Plant makes difference in calculating generator output and control valve positions. That is because such operating data as the main steam pressure, the main steam temperature and control valve positions of Yongkwang #3 are different from those of Kori #4. Therefore, the model parameters must be tuned by using actual operating data for the high fidelity of simulator in calculating the dynamic characteristic of the model. This paper describes that the $6{\sigma}$ method is used in improvement of precision of generator output calculation in the steam turbine model of the simulator.

A Synthetical Study on Power Quality Measurement of Grid-Connected Wind Turbine Generating System based on the IEC International Standards (IEC 국제표준에 따른 계통연계형 풍력터빈 발전기계통의 전력품질 측정방법에 관한 심화연구)

  • Cho, Soo-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.2
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    • pp.197-204
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    • 2014
  • As more and more renewable energy resources are connected into the existing power system and their generation capacities are increasing, the need for regulations to minimize their impacts on the power grid is increasingly growing. And minimizing the irregular impacts made by grid-connected wind generators is important, since the output power generated by renewable energy resources can be changed easily by the weather condition and surrounding environment. In South Korea, an operational technical standard for distributed generation is used as a regulation, in which renewable energy sources including wind power are considered as a kind of distributed generation. In this paper, an international standard, IEC 61400-21, for the grid-connected wind turbine generating system(WTGS) will be introduced and a comprehensive and detailed review on the measuring methods of power quality characteristic parameters for WTGS based on the related IEC standards will be presented. Additionally, some prerequisites for applying the international standards to KEPCO system will be proposed.