• 제목/요약/키워드: Auxiliary power system

검색결과 423건 처리시간 0.024초

이미지 센서를 이용한 크레인의 흔들림 계측 및 제어 (Measurement and Control of Swing Motion Using Image Sensor)

  • 김영복;카와이히데키;최용운;이권순;채규훈
    • 동력기계공학회지
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    • 제11권4호
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    • pp.103-108
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    • 2007
  • In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In many papers reported by us, we suggested a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. The measuring system is based on laser sensor or others. However it is not so useful in real world. Especially, in this paper, the image sensor is used to measures the motions of the spreader and the measured data are fed back to the controller in real time. The applied image processing technique is a kind of robust template matching method which is named Vector Code Correlation (VCC) and devised to consider the real environmental conditions. And the $H_{\infty}$ based control technique is applied to suppress swing motion of the crane. And the experimental result shows that the proposed measurement system based on image sensor and control system is useful and robust to disturbances.

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미분탄화력발전에서의 바이오매스 혼소 시 플랜트 성능특성 평가 (Evaluation of Plant Performance during Biomass Co-firing in Pulverized Coal Power Plant)

  • 문태영;;이은도;이정우;양원
    • 한국연소학회지
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    • 제19권3호
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    • pp.8-17
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    • 2014
  • The aims of this research were to evaluate effects of biomass co-firing to pulverized coal power plants and the variation of co-firing ratios on the plant efficiency related to power consumption of auxiliary system and flue gas characteristics such as production and component by process simulation based on the existing pulverized coal power plant. In this study, four kinds of biomass are selected as renewable fuel candidates for co-firing: wood pellet(WP), palm kernel shell(PKS), empty fruit bunch(EFB) and walnut shell(WS). Process simulation for various biomass fuels and co-firing ratios was performed using a commercial software. Gas side including combustion system and flue gas treatment system was considering with combination of water and steam side which contains turbines, condenser, feed water heaters and pumps. As a result, walnut shell might be the most suitable as co-firing fuel among four biomass since when 10% of walnut shell was co-fired with 90% of coal on thermal basis, flue gas production and power consumption of auxiliary systems were the smallest than those of other biomass co-firing while net plant efficiency was relatively higher than those of other biomass co-firing. However, with increasing walnut shell co-firing ratios, boiler efficiency and net plant efficiency were expected to decrease rather than coal combustion without biomass co-firing.

ZVT Series Capacitor Interleaved Buck Converter with High Step-Down Conversion Ratio

  • Chen, Zhangyong;Chen, Yong;Jiang, Wei;Yan, Tiesheng
    • Journal of Power Electronics
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    • 제19권4호
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    • pp.846-857
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    • 2019
  • Voltage step-down converters are very popular in distributed power systems, voltage regular modules, electric vehicles, etc. However, a high step-down voltage ratio is required in many applications to prevent the traditional buck converter from operating at extreme duty cycles. In this paper, a series capacitor interleaved buck converter with a soft switching technique is proposed. The DC voltage ratio of the proposed converter is half that of the traditional buck converter and the voltage stress across the one main switch and the diodes is reduced. Moreover, by paralleling the series connected auxiliary switch and the auxiliary inductor with the main inductor, zero voltage transition (ZVT) of the main switches can be obtained without increasing the voltage or current stress of the main power switches. In addition, zero current turned-on and zero current switching (ZCS) of the auxiliary switches can be achieved. Furthermore, owing to the presence of the auxiliary inductor, the turned-off rate of the output diodes can be limited and the reverse-recovery switching losses of the diodes can be reduced. Thus, the efficiency of the proposed converter can be improved. The DC voltage gain ratio, soft switching conditions and a design guideline for the critical parameters are given in this paper. A loss analysis of the proposed converter is shown to demonstrate its advantages over traditional converter topologies. Finally, experimental results obtained from a 100V/10V prototype are presented to verify the analysis of the proposed converter.

도시보급용 소형 태양광/풍력 복합발전의 계통연계운전에 관한 연구 (A Study on Utility Inter-Active for Urban Photovoltaic/Wind Hybrid Generation System)

  • 지운석;윤필현;조경재;이정일;임중열;차인수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 B
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    • pp.1504-1506
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    • 2004
  • Photovoltaic and wind power generation have an advantage of unpolluted and unlimited amount of energy resource. Since there is such an advantage in these energies, But photovoltaic system and wind system cannot always generate stable output with ever-changing weather condition. In this paper, the auxiliary power generator for hybrid system(photovoltaic 500[W], wind power generation 400[W]) was suggested. the auxiliary power generator that uses elastic energy of spiral spring to photovoltaic system was also added for present system. when output of photovoltaic system gets lower than 24[V], power was continuously supplied to load through the inverter by charging energy of spiral spring operates in DC generator.

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There-Phase Voltage-Source Soft-Switching Inverter with Auxiliary High Frequency Transformer Linked Power Regeneration Resonant Snubbers

  • Hattori, Hiroshi;Nakaoka, Mutsuo;Sakamoto, Kenji
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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    • pp.153-158
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    • 1998
  • In this paper, a prototype of the auxiliary resonant commutated snubber circuit(ARCS) with a high frequency transformer power regeneration loop is described for voltage source type sinewave inverter system. This is a new soft switching topology developed for three phase voltage source soft-switching inverter, active power filter and reactive power compensator has significant advantage of current rating reduction for auxiliary active switching devices. In addition, this paper presents a novel prototype of voltage-source soft switching space vector-modulated inverter with ARCS mentioned above, which is more suitable and acceptable for high-power utility interactive power conditioning, along with a digital control scheme. The steady-state operating analysis of ARCS has the remarkable features and the practical design procedure of this resonant snubber are illustrated on the basis of computer simulation analysis. The operating performance evaluations in the steady-state of this three phase voltage source soft switching inverter are discussed and compared with the three phase voltage source hard switching inverter.

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1,500MW대형원전 정지/저출력 안전성향상을 위한 설계개선안 및 민감도 분석 (Risk and Sensitivity Analysis during the Low Power and Shutdown Operation of the 1,500MW Advanced Power Reactor)

  • 문호림;한덕성;김재갑;이상원;임학규
    • 한국압력기기공학회 논문집
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    • 제15권1호
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    • pp.33-39
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    • 2019
  • An 1,500MW advanced power reactor required the standard design approval by a Korean regulatory body in 2014. The reactor has been designed to have a 4-train independent safety concept and a passive auxiliary feedwater system (PAFS). The full power risk or core damage frequency (CDF) of 1,500MW advanced power reactor has been reduced more than that of APR1400. However, the risk during the low power and shutdown (LPSD) operation should be reduced because CDF of LPSD is about 4.7 times higher than that of internal full power. The purpose of paper is to analysis design alternatives to reduce risk during the LPSD. This paper suggests design alternatives to reduce risk and presents sensitivity analysis results.

제지공장용 열병합발전시스템의 운용비용절감을 위한 합리적 운전기법 수립 (A Rational Operation Scheduling for Operational Cost Saving in Cogeneration System for Paper Mill)

  • 최광범;이종범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 C
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    • pp.1276-1278
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    • 1999
  • This paper proposed the optimal operational scheduling of cogeneration system for paper mill connected with several auxiliary devices. Auxiliary devices that include auxiliary boiler, waste boiler and sludge incinerator operate with multi-cogeneration system. Especially environment element was considered in objective function to solve environment problem. Electricity can be purchased through power system from utility. The proposed operational strategy on cogeneration system for paper mill to increase energy efficiency can be applied to the similar cogeneration system in industrial field.

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염료감응 태양전지를 이용한 선박용 LED등의 보조 전원 개발 (Development of LED Auxiliary Power System for Ship using DSSC)

  • 이진;양재창;김상기;소순열
    • 전기학회논문지
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    • 제63권9호
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    • pp.1312-1316
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    • 2014
  • The color and the installation position of the LED lamp for night voyage of the ship are changed by the purpose of it. The power dissipation occurs because a navigation light is on and off or continuously on. In addition, in case that the light is produced by operating generator in the ship, it's very inefficient except that it's on a voyage. Therefore in this dissertation, we construct auxiliary power system for the LED lamp of the ship, producing and developing a module, a panel, and a charging system using Dye-sensitize Solar Cell.

Solar Cell을 적용한 교통 시설물용 휀스의 전원 충전용 컨트롤러에 관한 연구 (The Study on the Controller for Battery of fence power supply with traffic Auxiliary system by Solar Cell)

  • 윤형상;임중열;윤석암;차인수;장헌
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 1998년도 학술발표회논문집
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    • pp.166-169
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    • 1998
  • This paper represent about design of the controller for battery of fence with traffic controller for battery of fence with traffic auxiliary system for power supply using solar cell. Simulation is represents V-I and power characteristic by Pspice. This system is successfully operating with high clearness lights.

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Aspen Plus 프로그램에 의한 장갑차량용 고온고분자전해질 연료전지 기반 보조전원장치 성능 시뮬레이션 분석 (Analysis for Performance of the HT-PEFC based Auxiliary Power Unit by Aspen Plus Software)

  • 유민규;박지일;권혁상
    • 한국군사과학기술학회지
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    • 제19권2호
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    • pp.211-217
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    • 2016
  • The fuel cell based auxiliary power unit (APU) is promising for power source of armed vehicles due to its silence and high efficiency. Especially, the on board hydrogen generation and fed to fuel cell system was core technology of this power system. In this study, we analyzed the performance of the Auto thermal reactor (ATR) that produce the hydrogen from the fuel, integrated High temperature polymer electrolyte fuel cell (HT-PEFC) by Aspen plus software. The fuel was designed as a n-dodecane for analysis of military fuel (JP-8).