• 제목/요약/키워드: Installation time

검색결과 2,014건 처리시간 0.028초

대학건물의 전력소비패턴 분석을 통한 태양광, ESS 적정용량 산정 및 경제적 효과 분석 (Calculation of Photovoltaic, ESS Optimal Capacity and Its Economic Effect Analysis by Considering University Building Power Consumption)

  • 이혜진;최정원
    • 한국산업융합학회 논문집
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    • 제21권5호
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    • pp.207-217
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    • 2018
  • Recently, the importance of energy demand management, particularly peak load control, has been increasing due to the policy changes of the Second Energy Basic Plan. Even though the installation of distributed generation systems such as Photovoltaic and energy storage systems (ESS) are encouraged, high initial installation costs make it difficult to expand their supply. In this study, the power consumption of a university building was measured in real time and the measured power consumption data was used to calculate the optimal installation capacity of the Photovoltaic and ESS, respectively. In order to calculate the optimal capacity, it is necessary to analyze the operation methods of the Photovoltaic and ESS while considering the KEPCO electricity billing system, power consumption patterns of the building, installation costs of the Photovoltaic and ESS, estimated savings on electric charges, and life time. In this study, the power consumption of the university building with a daily power consumption of approximately 200kWh and a peak power of approximately 20kW was measured per minute. An economic analysis conducted using these measured data showed that the optimal capacity was approximately 30kW for Photovoltaic and approximately 7kWh for ESS.

레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구 (A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode)

  • 구자남;염정덕;지철근
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 1990년도 추계학술발표회논문집
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    • pp.23-27
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    • 1990
  • A new signal processing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes a long time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. The delay time of this signal processing system is < 45${\mu}$s. Specially in this paper we describe all electronic circuit and optical system design

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A Study of False Contour Noise in Moving Images through Consideration of the Phosphor Decay Time of AC PDP

  • Jeong, Dong-Cheol;Moon, Cheol-Hee
    • 조명전기설비학회논문지
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    • 제21권9호
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    • pp.12-17
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    • 2007
  • The dynamic false contour noise was analyzed with consideration for the phosphor decay time of an ac PDP by computer simulation based on the measurement of the 1/10 phosphor decay times of the primary colors red, green and blue at the main wavelengths of each phosphor. The noise level of dynamic false contour is strongly dependent on phosphor decay time. The noise level decreases incrementally with the phosphor decay time, whereas the noise width increases. The moving velocity of an object does not affect the noise level. The entire experiment was performed under the condition of 8 subfields ADS driving scheme, 2.5[${\mu}sec$] scan speed, and 5[${\mu}sec$] sustain period with VGA grade panel.

레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구 (A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode)

  • 강성철;진상규;지철근
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 1991년도 추계학술발표회논문집
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    • pp.33-37
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    • 1991
  • A now signal precessing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes along time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. the delay time of this signal processing system is < 45 $\mu$s. Specially in this paper we describe all electronic circuit and optical system design

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시간지연 시스템의 응답특성 개선을 위한 제어기 설계 (Design of the Controllers for the Improved Response of Time Delay Systems)

  • 이석원;양승현
    • 조명전기설비학회논문지
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    • 제19권7호
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    • pp.15-19
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    • 2005
  • 시간지연이 존재하는 시스템의 제어기 설계에 많이 사용되는 Smith Predictor는 플랜트와 모델이 완전히 일치해야만 특성방정식에서 시간지연을 제거 할 수 있기 때문에 실제 공정에서는 적용하기가 매우 어렵다. 본 논문에서는 Smith Predictor의 모델을 플랜트와 일치한 식이 아닌 시간지연을 포함한 2차식 형태로 제안하여 큰 시간지연에서의 응답특성을 향상 시켰다. PI 제어기의 적분상수의 범위를 제안하였다.

Reconstruction of the Electron Density Profile in O-mode Ultrashort Pulse Reflectometry using a Two-dimensional Finite Difference Time Domain

  • Roh, Young-Su
    • 조명전기설비학회논문지
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    • 제27권7호
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    • pp.52-58
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    • 2013
  • The two-dimensional finite difference time domain algorithm is used to numerically reconstruct the electron density profile in O-mode ultrashort pulse reflectometry. A Gaussian pulse is employed as the source of a probing electromagnetic wave. The Gaussian pulse duration is chosen in such a manner as to have its frequency spectrum cover the whole range of the plasma frequency. By using a number of numerical band-pass filters, it is possible to compute the time delays of the frequency components of the reflected signal from the plasma. The electron density profile is reconstructed by substituting the time delays into the Abel integral equation. As a result of simulation, the reconstructed electron density profile agrees well with the assumed profile.

전력변환기를 이용한 영구자석 동기전동기용 실시간 시뮬레이터 (Real Time Simulator for a Permanent Magnet Synchronous Motor with Power Converter)

  • 오현철;김학원;조관열
    • 조명전기설비학회논문지
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    • 제27권12호
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    • pp.114-124
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    • 2013
  • Recently, the real time simulator to develop the inverter drive board and motor control algorithm for high power induction motor and PM synchronous motor is required. In this paper, the real time simulator based on the voltage control for a PM synchronous motor is proposed. The resistor, inductor, and the induced voltage for the modeling of a PM synchronous motor is implemented by the power converter including the LCL filter and the PWM rectifier. The induced voltage of a PM synchronous motor is simulated by the capacitor voltage of the LCL filter, which is controlled by PI voltage controller and the deadbeat current controller. The operation and the simulated characteristics of the proposed real time simulator for a PM synchronous motor is verified by the simulation.

군용시설물(軍用施設物) 폐수처리(廢水處理)를 위한 고정생물막공법(固定生物膜工法)의 연구(硏究) (A Study on the Aerated Submerged Fixed-Film Bioreactor for Military Installation Wastewater Treatment)

  • 서형석;유성호
    • 상하수도학회지
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    • 제7권1호
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    • pp.37-45
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    • 1993
  • This research was performed to examined the applicability of a fixed-biofilm process for the wastewater treatment of military installations. Utilizing plastic net media, synthetic wastewater-average $BOD_5$ cocentration was $192mg/l$ treated in the three sets of reactors that have 8 hours, 6 hours, and 4 hours of hydraulic retention time. The results of this experiment showed that the biofilm was not detached easily, and the reactor was not closed by excess biomass. The average soluble $BOD_5$ concentrations of effluent were $6.0mg/l$ with 8 hours of retention time, $11.3mg/l$ with 6 hours of retention time, and $19.4mg/l$ with 4 hours of retention time. Especially it was reduced to $5.7mg/l$ in the second stage reactor with 4 hours of retention time. These resulted that the fixed-biofilm process could be adapted for the treatment of military installation wastewater.

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하이브리드 방법을 이용한 전력계통 안정도 해석 (Power System Stability Analysis Using a Hybrid Approach)

  • 서규석;박지호
    • 조명전기설비학회논문지
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    • 제24권10호
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    • pp.21-25
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    • 2010
  • This paper explains hybrid method that combines Time domain simulation technique with the direct method of Transient stability analysis. First, it calculate trajectory of real system by Time domain Simulation using OOP(Object Oriented Programming method) and evaluate Transient Energy Function to induce stability index to calculate Transient stability margin. Once the status of system(stable or unstable) has been identified, proper criteria are proposed to stop time-domain simulation to reduce CPU time.

인터버스 순환시간 측정에 대한 연구 (The Study on the Cycling Time for Interbus)

  • 박장환
    • 조명전기설비학회논문지
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    • 제18권6호
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    • pp.170-175
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    • 2004
  • 자동차 산업에서 널리 사용되는 인터버스의 순환 시간에 대한 시험이 이 논문에서 평가되었다. 순환시간의 측정은 인터버스의 성능을 측정하는데 중요한 요소이다. 시험은 전자파가 존재하는 환경과 존재하지 않는 정상적인 환경에서 실행되었다. 이론적으로 계산되는 인터버스 순환시간과 실제의 장비들을 활용하여 시험한 값은 거의 차이가 없었다. 그 결과로서 인터버스는 결정론적이며 신뢰성 있는 시스템임을 보여 주었다.