• Title/Summary/Keyword: Power Station

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A Case Study on the Chungsong Pumped-storage power station Construction (청송 양수발전소 시공사례)

  • Hong, Chang-Soo;Lee, Hyun-Koo;Do, Jong-Youl
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.10a
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    • pp.169-178
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    • 2006
  • The pumped-storage power system is the one of the hydroelectric power systems, generating electricity with hydraulic head difference. In this system, the electricity is produced during the hours of peak demand by using water that has been pumped into an upper reservoir from a lower reservoir during the hours of low demand. Generally, the system consists of an under-ground power house and tunnels such as the headrace, pressure, and tailrace tunnels. The Chungsong pumped-storage power station is the sixth one In the pumped-storage power station in Korea. Both the regional self-government and the population of chungsong -Goon had made a great effort to draw this power station construction into this area. The proposed Chungsong pumped-power station construction project was accepted by the central government as a part of the national electricity plan for the first time in Korea.

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A Study on measurement for effective isotropic radiated power based power management of the base stations (등가등방성복사전력 기반의 기지국 출력 관리를 위한 측정 연구)

  • Lim, Jae-Choon;Kim, Jong-Heon;Moon, Sung-Won;Lee, Young-Hwan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.6
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    • pp.118-125
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    • 2011
  • In this paper, a WCDMA experimental base station is constructed for power management of mobile communication base station and effective isotropic radiated power is determined by using received power of pilot channel measured on the line-of sight. The measurement system was constructed by a experimental base station and a measurement receiver and the common pilot channel (CPICH) power of the base station was measured. Effective isotropic radiated power (EIRP) of the base station obtained by the measurement value considering correction factor for the errors represented the difference of 0.5 dB compared to the established EIRP of the base station.

Research Progress of the Structure Vibration-Attitude Coordinated Control of Spacecraft

  • Yang, Jingyu;Qu, Shiying;Lin, Jiahui;Liu, Zhiqi;Cui, Xuanming;Wang, Chu;Zhang, Dujiang;gu, Mingcheng;Sun, Zhongrui;Yang, Kang;Zhou, Lanwei;Chen, Guoping
    • International Journal of Aeronautical and Space Sciences
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    • v.16 no.4
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    • pp.590-601
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    • 2015
  • This paper gives an overview of research on the field of structure vibration-attitude coordinated control of spacecraft. First of all, the importance of the technology has been given an introduction, and then later the research progress of space structure dynamics modeling, research progress of structure vibration-attitude coordinated control of flexible spacecraft have been discussed respectively. Finally, future research on application of structure vibration-attitude coordinated control of spacecraft has been recommended.

Comparison and Analysis of Domestic and Foreign Standard for Solely Environment Installation of Power Station (수·변전설비의 안전 환경 설치에 관한 국내외 규정 비교 분석)

  • Bae, Seok-Myung;Kim, Han-Sang;Bang, Sun-Bae;Lee, Kun-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.5
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    • pp.45-53
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    • 2005
  • It's a general tendency that electrical facilities of power station become a large size and increase in number because electrical facilities become big and complicated with internal industrial development and economic growth. So, electrical accidents were increased in this electrical facilities of power station. Therefore, in this paper we compared domestic and foreign standard on safety environment of power station. From this, we draw several questions in case of installation on power station and we proposed a draft of relative standard to apply in power station.

A Study on the Output Power Optimization of Mobile WiMAX Base Station (Mobile WiMAX 기지국의 최적 출력파워 도출에 관한 연구)

  • Kim, Sung-Man
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.4A
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    • pp.341-349
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    • 2010
  • In this paper, we studied on the optimization of the output power of Mobile WiMAX (IEEE 802.16) base station considering the technical condition of base station and wireless channel condition. The optimum power of base station can be estimated based on the link budget calculation of downlink and uplink in the Mobile WiMAX communication system. We investigated the optimum output power of base station in the case of 2Tx-2Rx base station with $2{\times}2$ MIMO(multiple input multiple output) technology, 2Tx-4Rx base station with improved receiver sensitivity, and 4Tx-4Rx base station with beamforming technology.

Incorporating Station Related Aging Failures in Bulk System Reliability Analysis

  • Billinton Roy;Yang Hua
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.322-330
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    • 2005
  • This paper proposes methods to incorporate station related aging failures in composite system reliability assessment. Aging failures of station components, such as circuit breakers and bus bars, are a major concern in composite power system planning and operation as an increasing number of station components approach the wear-out phase. This paper presents probabilistic models for circuit breakers involving aging failures and relevant evaluation techniques to examine the effects of station related aging outages. The technique developed to incorporate station related aging failures are illustrated by application to a small composite test system. The paper illustrates the effects of circuit breaker aging outages on bulk system reliability evaluation and examines the relative effects of variations in component age. System sensitivity analysis is illustrated by varying selected component parameters. The results show the implications of including component aging failure considerations in the overall analysis of a composite system.

Geophysical investigations for deciding alignment of head race tunnel and location of lake tapping at Koyna hydroelectric project, Maharashtra, India

  • Wadhwa R. S.;Chaudhari M. S.;Chandrasekhar V.;Saha A.;Mukhopadhyay R.
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.370-378
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    • 2003
  • Continuous seismic refraction, reflection and echo-sounder surveys conducted at Koyna Project site provided geotechnical information which helped in choosing the alignment for Head race tunnel and in designing and choosing the site for Lake Tap. Seismic refraction survey both on land and in shallow water determined depths to bedrock and helped in inferring the bedrock quality. Seismic reflection survey mapped the subsurface stratigraphy with high resolution. Reservoir-bed and bedrock contours drawn from the results of the survey helped in choosing the tunnel alignment and the lake tap position cost effectively. It was inferred from the results of the survey that the geology and the quality of rock do not change unexpectedly around the site for extension of Head race tunnel and the lake tapping. The bedrock levels evaluated by seismic survey agreed remarkably well with those inferred in boreholes having Rock Quality Designation 90 percent or more.

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Multilevel Inverter Development to Utilize Renewable Energy in Urban Railway Station (도시철도 역사 신재생에너지 활용을 위한 멀티레벨 인버터 개발)

  • Shin, Seungkwon;Kim, Hyungchul;Jung, Hosung;Park, Jong Young;Hyun, Byungsoo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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    • pp.324-330
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    • 2015
  • Energy Saving Methods in existing railway vehicle are considered by active approach such as regenerative energy storage and utilization, eco driving, etc. On the other hands, energy saving measures in railway station are operated by passive method such as reduction of operating time in ventilation system, cooing system and power equipment. To reduce energy and for independence in railway system, it requires an active energy saving measures. It needs to its own power source besides the power source of electric supply company such as renewable energy and regenerative energy and take the advantage of power storage system and stored power are used in optimum time. This paper deal with 3-level NPC inverter and T-type NPC inverter that used in various multi-level topology applicable to the railway system.

Construction of Indoor Ground Station for Cubesat Communication Test (큐브위성 송수신시험을 위한 실내용 지상국 구축)

  • Han, Sanghyuck;Moon, Sangman;Shin, Dongyeop;Moon, SungTae;Gong, Hyeon Cheol;Choi, Gi-Hyuk
    • Aerospace Engineering and Technology
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    • v.13 no.2
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    • pp.73-79
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    • 2014
  • During developing cubesat flight software, Communication test between cubesat and ground station is needed. For this, we have constructed indoor ground station without outdoor antenna for decreasing total cost and time. In this time, if output power of ground station is high, it will affect for cubesat transceiver to be fail. For solving this problem, ground station must be designed for output power of it to be lower than input power of cubesat satellite, and it must be verified. In this paper, first, we describe cubesat indoor ground station using UHF and VHF. Second, we describe output power decreasing test for indoor operation of ground station by attaching attenuators in the end of the output connector.

The Analysis of Activity on Removal from Operation of the Chernobyl Atomic Power Station, Experience of the First Year After Closing Power Station

  • Kravchenko, Georgiy;Jung, Ki-Jung
    • Proceedings of the Korean Nuclear Society Conference
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    • 2002.05a
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    • pp.319.2-319
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    • 2002
  • removal from operation of power units of nuclear stations in the various counties last decade the usual phenomenon. Good practice on a successful conclusion from operation of power units in Japan. USA is turned out. Germany, Russia and other countries. The features inherent in the Chernobyl atomic power station make this process especial, unique.

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