• 제목/요약/키워드: low-power system

검색결과 5,516건 처리시간 0.048초

Low Calorific Gasturbine 매립지 적용 및 유리온실 운용기술 설계 (Design for Landfill Gas Application by Low Calorific Gas Turbine and Green House Optimization Technology)

  • 허광범;박정극;이정빈;임상규
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
    • /
    • pp.244.1-244.1
    • /
    • 2010
  • Bio energy development by using Low Calorific Gas Turbine(LCGT) has been developed for New & Renewable energy source for next generation power system, low fuel and operating cost method by using the renewable energy source in landfill gas (LFG), Food Waste, water waste and Livestock biogas. Low calorific fuel purification by pretreatment system and carbon dioxide fixation by green house system are very important design target for evaluate optimum applications for bio energy. Main problems and accidents of Low Calorific Gas Turbine system was derived from bio fuel condition such as hydro sulfide concentration, siloxane level, moisture concentration and so on. Even if the quality of the bio fuel is not better than natural gas, LCGT system has the various fuel range and environmental friendly power system. The mechanical characterisitics of LCGT system is a high total efficiency (>70%), wide range of output power (30kW - 30MW class) and very clean emmission from power system (low NOx). Also, we can use co-generation system. A green house designed for four different carbon dioxide concentration from ambient air to 2000 ppm by utilizing the exhaust gas and hot water from LCGT system. We look forward to contribute the policy for Renewable Portfolio Standards(RPS) by using LCGT power system.

  • PDF

Bulk-Driven 기법을 이용한 저전압 Analog Multiplier (The Low Voltage Analog Multiplier Using The Bulk-driven MOSFET Techniques)

  • 문태환;권오준;곽계달
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2001년도 하계종합학술대회 논문집(2)
    • /
    • pp.301-304
    • /
    • 2001
  • The analog multiplier is very useful building block in many circuits such as filter, frequency-shifter, and modulators. In recent year, The main design issue of circuit designer is low-voltage/low-power system design, because of all systems are recommended very integrated system and portable system In this paper, the proposed the four-quadrant analog multiplier is using the bulk-driven techniques. The bulk-driven technique is very useful technique in low-voltage system, compare with gate-driven technique. therefore the proposed analog multiplier is operated in 1V supply voltage. And the proposed analog multiplier is low power dissipation compare with the others. therefor the proposed analog multiplier is convenient in low-voltage/low-power in system.

  • PDF

하이브리드시스템 모델링 기반 발전기 전력시스템 안정화장치 정수선정 기법 (Parameter Selection Method for Power System Stabilizer of a Power Plant based on Hybrid System Modeling)

  • 백승묵
    • 전기학회논문지
    • /
    • 제63권7호
    • /
    • pp.883-888
    • /
    • 2014
  • The paper describes the parameter tuning of power system stabilizer (PSS) for a power plant based on hybrid system modeling. The existing tuning method based on bode plot and root locus is well applied to keep power system stable. However, due to linearization of power system and an assumption that the parameter ratio of the lead-lag compensator in PSS is fixed, the results cannot guarantee the optimal performances to damp out low-frequency oscillation. Therefore, in this paper, hybrid system modeling, which has a DAIS (differential-algebraic-impusive-switched) structure, is applied to conduct nonlinear modeling for power system and find optimal parameter set of the PSS. The performances of the proposed method are carried out by time domain simulation with a single machine connected to infinite bus (SMIB) system.

저전력 임베디드 시스템을 위한 프로그램이 수행되는 메모리에 따른 소비전력의 정략적인 분석 (Quantitative Analysis of Power Consumption for Low Power Embedded System by Types of Memory in Program Execution)

  • 최하연;구영경;박상수
    • 한국멀티미디어학회논문지
    • /
    • 제19권7호
    • /
    • pp.1179-1187
    • /
    • 2016
  • Through the rapid development of latest hardware technology, high performance as well as miniaturized size is the essentials of embedded system to meet various requirements from the society. It raises possibilities of genuine realization of IoT environment whose size and battery must be considered. However, the limitation of battery persistency and capacity restricts the long battery life time for guaranteeing real-time system. To maximize battery life time, low power technology which lowers the power consumption should be highly required. Previous researches mostly highlighted improving one single type of memory to increase ones efficiency. In this paper, reversely, considering multiple memories to optimize whole memory system is the following step for the efficient low power embedded system. Regarding to that fact, this paper suggests the study of volatile memory, whose capacity is relatively smaller but much low-powered, and non-volatile memory, which do not consume any standby power to keep data, to maximize the efficiency of the system. By executing function in specific memories, non-volatile and volatile memory, the quantitative analysis of power consumption is progressed. In spite of the opportunity cost of all of theses extra works to locate function in volatile memory, higher efficiencies of both power and energy are clearly identified compared to operating single non-volatile memory.

잡음 발생기의 저면적, 저전력 방안에 관한 연구 (A Study on Low Area/Power Schemes of Noise Generation System)

  • 이창기
    • 한국컴퓨터산업학회논문지
    • /
    • 제4권4호
    • /
    • pp.433-442
    • /
    • 2003
  • 통신 시스템의 성능은 여러 가지 요구 조건을 고려하여 측정되어져야 한다. 이러한 목적으로 잡음 발생기는 주어진 특성을 갖는 잡음 신호를 생성하는데 사용되어진다. 최근의 연구에서 잡음 모델이 복잡한 PSD를 갖는 경우 DCT를 이용한 잡음 발생기가 기존의 잡음 발생기보다 우수한 성능을 보였다. 본 논문에서는 DCT 기반 잡음 발생기에서 DCT를 제외한 회로의 면적을 줄일 수 있는 구조와 전력을 최소화시킬 수 있는 구조를 제안한다. 모의실험에서 면적을 최소화하기 위한 구조는 61-64%의 면적을 줄였으며, 전력을 고려한 구조에서는 88-89%정도의 전력소모를 감소를 예측할 수 있다.

  • PDF

한전 전력계통의 저주파 진동현상 요인분석;양수발전기 기동시 (Analysis of the Factors Affecting Low-Frequency Oscillations in KEPCO Power System` With Pumped-Storage Plant)

  • Kil Yeong Song;Sae Hyuk Kwon;Kyu Min Ro;Seok Ha Song
    • 대한전기학회논문지
    • /
    • 제41권8호
    • /
    • pp.841-849
    • /
    • 1992
  • In power system operation, the stability of synchronous machine has been recognized one of the most important things. AESOPS program developed by EPRI in U.S.A. is a frequency domain analysis program in power system stability and it computes the electro-mechanical oscillation mode. This paper presents how to analyze the power system small signal stability problem efficiently by uusing the AESOPS program and analyze the various factors affecting the damping characteristics of these oscillations in KEPCO power system of 1986 with pumped-storage plant. To reduce the computing time and efforts, selecting the poorly-damped oscillation mode and clustering technique have been used. The characteristics of load, the amount of power flow on the transmission line and the gain of exciter have a significant effects on the damping of the system while the governing system has only a minor one. With the Power System Stabilizers, the stability of the power system has been improved.

  • PDF

낮은 스위칭 주파수를 갖는 대용량 무정전 전원장치를 위한 반복제어기 (Repetitive Controller for High Power UPS System with Low Switching Frequency)

  • 이태영;조영훈;김지수;변용섭
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2016년도 전력전자학술대회 논문집
    • /
    • pp.477-478
    • /
    • 2016
  • This paper introduces a repetitive controller in low switching frequency applications. Generally, A high power UPS system has a high rated current. And the system usually consist of high power IGBT has a tail current. So the high power UPS system operates in low switching frequency because of this tail current. The repetitive controller improve THD of output voltage or current by reducing the steady state error. The effect of the repetitive controller is proved by simulations.

  • PDF

Low Power Test for SoC(System-On-Chip)

  • 정준모
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 2011년도 추계학술대회
    • /
    • pp.892-895
    • /
    • 2011
  • SoC(System-On-Chip)을 테스트 하는 동안 소모하는 전력소모는 SoC내의 IP 코어가 증가됨에 따라 매우 중요한 요소가 되었다. 본 논문에서는 Scan Latch Reordering과 Clock Gating 기법을 적용하여 scan-in 전력소모를 줄이는 알고리즘을 제안한다. Scan vector들의 해밍거리를 최소로 하는 새로운 Scan Latch Reordering을 적용하였으며 Gated scan 셀을 사용하여 저전력을 구현하였다. ISCAS 89 벤치마크 회로에 적용하여 실험한 결과 모든 회로에 대하여 향상된 전력소모를 보였다.

  • PDF

전력선 통신 시스템을 위한 신호 감쇠 저하 장치 연구 (A Study on the Signal Anti-reduction Equipment in Power Line Communication)

  • 김주환
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2000년도 전력전자학술대회 논문집
    • /
    • pp.103-106
    • /
    • 2000
  • In this paper a communication system that is not using the communication line but power line is presented. It will be very useful for an information-oriented society with tele-metering and home automation. Conventional system has a difficulty in transmitting information due to decreasing communication voltage and increasing carrier, current. Proposed idea is a special type switching amplifier system which has a low inner resistance. It can provide reactive power and dose not have low impedance between the transceivers. This new system is proposed to overcome the loss of conductor load in a PLC system.

  • PDF

Enhancement of Power System Dynamic Stability by Designing a New Model of the Power System

  • Fereidouni, Alireza;Vahidi, Behrooz
    • Journal of Electrical Engineering and Technology
    • /
    • 제9권2호
    • /
    • pp.379-389
    • /
    • 2014
  • Low frequency oscillations (LFOs) are load angle oscillations that have a frequency between 0.1-2.0 Hz. Power system stabilizers (PSSs) are very effective controllers in improvement of the damping of LFOs. PSSs are designed by linearized models of the power system. This paper presents a new model of the power system that has the advantages of the Single Machine Infinite Bus (SMIB) system and the multi machine power system. This model is named a single machine normal-bus (SMNB). The equations that describe the proposed model have been linearized and a lead PSS has been designed. Then, particle swarm optimization technique (PSO) is employed to search for optimum PSS parameters. To analysis performance of PSS that has been designed based on the proposed model, a few tests have been implemented. The results show that designed PSS has an excellent capability in enhancing extremely the dynamic stability of power systems and also maintain coordination between PSSs.