• 기계와재료
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• v.26 no.1
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• pp.6-15
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• 2014

마이크로 가스터빈은 수백 kW의 전기를 생산하는 시스템으로, 최근 천연가스 이용의 확산과 분산 발전에 대한 관심이 증가되면서 기술 개발에 대한 요구가 증가하고 있다. 재생열교환기의 도입과 CHP 시스템 적용을 통해 에너지 효율을 개선하고 각 부품의 가격 경쟁력이 확보된다면, 단위 면적당 출력이 높고, 낮은 공해 물질 배출 특성을 갖는 마이크로 가스터빈은 입지 선정이 용이하고 기존의 도시 가스 공급망을 활용할 수 있다는 측면에서 분산형 발전 시스템의 핵심 역할을 담당할 수 있을 것이다. 이에 마이크로 가스터빈의 기술개발 동향을 소개하고자 한다.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.565-567
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• 2008

가스터빈용 자동전압조정기는 발전기 출력 전압을 측정하여 발전기 단자 전압과 계자 전류를 제어하며, 발전기 여자시스템 보호/제한 기능을 수행한다. 본 논문에서는 전력연구원이 개발한 가스터빈 자동전압조정기의 시작품에 대한 소프트웨어와 하드웨어에 설계 및 제주화력 가스터빈에 현장 적용한 결과를 상세히 기술하였다.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2144-2146
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• 2001

본 논문은 국내 한 발전소의 가스터빈 제어계통을 개조하기 위해 제작된 터빈제어시스템과 제어로직의 타당성을 검증하기 위해 구현한 시뮬레이터에 대해서 언급하고자 한다. 시뮬레이터는 가스터빈 계통의 열역학적 모델 부분, 제어시스템과 인터페이스를 위한 입출력 시스템 및 사용자 그래픽 인터페이스 부분으로 구성되어 있다. 실제 출력 운전상태에서 발전 운전데이터를 취득하였고, 이 데이터를 가지고 구현된 시뮬레이터의 성능을 확인한 결과 현장과 유사한 특성을 보여 주었다.

• Proceedings of the KIEE Conference
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• 1997.07b
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• pp.639-641
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• 1997

전력계통의 주파수는 전력의 수요와 공급량의 평형상태에 따라 수시로 변동하며, 각 발전소에서는 이 주파수를 입력 신호로 사용하여 발전기의 출력을 제어하고 있다. 본 논문에서는 국내에서 운영하고 있는 한 개스터빈 발전소의 터빈제어 시스템을 모델로 하여 주파수 추종성에 영향을 미치는 파라미터들을 분석하고, 시뮬레이션을 통해 주파수 추종성을 향상시키기 위한 방안을 제시하였으며, 현장에 적용한 결과를 통해 제안된 주파수 추종성 향상방안의 타당성을 검증하였다.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2147-2149
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• 2001

국내 한 증기터빈 발전소의 출력증감발 운전을 중앙급전 명령에 의해 가능하도록 하는 제어로직을 구현하였다. 이는 중앙급전으로부터 증감발 펄스 신호를 입력받아 발전기 출력 설정치를 변경함으로써 이루어지고, 증감되는 양은 펄스의 지속시간에 의해 이루어지며 여러 가지 운전상황에 대해 원활한 운전전환이 이루어져야 한다. 본 논문에서는 이를 구현하기 위해 제어로직 및 운전원 조작 화면의 구성을 소개하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.8
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• pp.653-660
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• 2015

In this study, we conduct power performance and load analyses of two different types of vertical-axis tidal-current turbines using the computational fluid dynamics (CFD) method. To analyze the power output and loads, we perform transient CFD simulations considering the cavitation model using ANSYS CFX. The averaged power output of an H-type rotor was 7.47 kW and 67.6 kW in normal and extreme operating conditions, respectively, which did not satisfy the initial design conditions. However, in the case of the helical-type rotor, the power output under normal and extreme conditions were close to the expected values. The cavitation, which may cause instantaneous power fluctuation, occurred repeatedly at the suction side of the rotors. In order to guarantee a more stable power supply and to prevent fatigue failure, we require a design that minimizes cavitation.

• Plant Journal
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• v.15 no.3
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• pp.23-28
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• 2019

In this study, ammonia consumption by gas turbine output was adjusted to find out the amount of ammonia consumption that complies with the enhanced Air Quality Preservation Act and internal regulation emission standards in SCR type DeNOx System for a 580 MW Sejong Combined Cycle Power Plant. For measurements, the gas turbine output was varied to 50, 99, 149, 198 MW and ammonia consumption was adjusted with the combustion gas and ammonia supply conditions fixed at each stage. When the emission limit were change from 10 ppm to 8 ppm, ammonia consumption was increased from 78, 93, 105, 133 kg/h to 89, 113, 132, 176 kg/h. The increase rate of ammonia consumption was 14, 22, 26, 32% per output category compared to the 10 ppm emission limit, which was shown to increase as output increased.

• Plant Journal
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• v.13 no.1
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• pp.37-43
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• 2017

This study analyzed the change of gas turbine performance with air temperature decrease by the evaporation cooling system in summer season. Gas turbine performance was tested on the condition that ambient temperature is $29{\pm}1^{\circ}C$. As a result, Air temperature at the compressor inlet was decreased by $4.12^{\circ}C$ after the installation of evaporation cooling system. Decreased air temperature followed by increased air density affected gas turbine performance, Which increased compressor pressure ratio by 0.27, improved compressor efficiency of 0.29 %p, improved gas turbine enthalpy drop efficiency of 0.31 %p, improved the gas turbine efficiency by 0.44 %p, improved electric power output by 4,489 kW. On the other side, the influence of the humidity increase and flow resistance increase was negligible.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.8
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• pp.661-668
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• 2015

We present a design methodology for horizontal-axis tidal turbine blades based on blade element momentum theory, which has been used for aerodynamic design and power-performance analysis in the wind-energy industry. We design a 2-blade-type 1 MW HATT blade, which consists of a single airfoil (S814), and we present the detailed design parameters in this paper. Tidal turbine blades can experience cavitation problems at the blade-tip region, and this should be seriously considered during the early design stage. We perform computational fluid dynamics (CFD) simulations considering the cavitation model to predict the power performance and to investigate the flow characteristics of the blade. The maximum power coefficient is shown to be about 47 under the condition where TSR = 7, and we observed cavitation on the suction and pressure sides of the blade.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.4
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• pp.371-378
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• 2015

Range extenders, which are power generation systems driven by small engines, extend the driving distance and time of electric vehicles (EVs) through continuous charging of batteries. The currently used range extenders with gasoline engines pose limitations with regard to the realization of high-power compact systems, owing to their complex structure and low energy density. In contrast, micro gas turbine (MGT) range extenders (MGT power packs) possess high power and low weight, and can therefore be significantly reduced in size despite increase in speed. In this study, an MGT power pack for the range extenders of EVs was developed using a turbo-prop micro turbine, an alternator for passenger vehicles and electric batteries. The operating characteristics of the MGT power pack were measured through a series of experiments conducted under electrical no-load and load conditions. Their power generation performance and efficiency were measured under various electrical loads and power transmission gear ratios. From the results, electrical load was found to have no influence on power generation performance. The maximum electrical power output was 0.8 kW at a core turbine speed of 150 krpm, and the application of 3:1 reduction gear to the turbine output shaft increased the power to 1.5 kW by 88%. This implies that the test results demonstrated stable power generation performance of the MGT power pack regardless of vehicle load changes, thus revealing its feasibility for use with the range extenders of EVs.