• Title/Summary/Keyword: Operation-level

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A Study on the Improvement of Subsidy Program for CHP Plant Connected with Capital Region District Heating System (수도권 지역난방연계 열병합발전소의 기반기금 지원과 개선방안)

  • 김창수;이창호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.2
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    • pp.97-103
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    • 2004
  • CHP system supplies electricity and heating together with high efficiency. Current utility's CHP system uses electric power by itself and sells thermal energy to KDHC(Korea District Heating Corporation). CHP's operation cost except sales revenue of heating was covered by the sale revenue of electricity. Thus Electric generation cost in district Heating CHP system has close relationship with the level of heating price. However, after the restructuring of electricity industry, the operation cost could not be covered by sales revenue of heating and electricity. This loss was compensated by energy subsidy program in the electric power industry infrastructure fund. This paper suggests reasonable evaluation and improvement methods of the loss calculation of CHP system utilizing the infrastructure fund efficiency In terms of the direction of support by the fund, it provides the methods to prevent inefficient operation through setting up the upper limit of subsidy and to improve the loss calculation. Moreover, it suggest fixed rate support by heating supply level and reducing subsidy gradually for an efficient operation of CHP system.

Development of Inverter for Improvement of Low Temperature Operation of LCD Backlight using Flat Fluorescent Lamp (FFL) (면광원을 이용한 LCD 백라이트의 저온구동특성 향상을 위한 인버터 개발)

  • Hur, Jeong-Wook;Lim, Sung-Kyoo
    • Journal of the Microelectronics and Packaging Society
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    • v.14 no.1
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    • pp.11-17
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    • 2007
  • The CCFLs, EEFLs and FFLs use mercury and the operating conditions are different at warm or cold temperature. At start of operation, there may exist a possibility of inhomogeneous operation of lamps or channels of FFL to the very low vapor pressure of mercury at low temperature. In this paper, an inverter with level control block (LCB) was developed to drive LCD backlight using FFL stably at low temperature range. The operation of FFL backlight at $-20^{\circ}C$ was successfully demonstrated by developing inverter with LCB under 130 Watt of power consumption.

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A Study on the 0.5$\mu\textrm{m}$ Dual Gate High Voltage Process for Multi Operation Applications (Multi Operation을 위한 0.5$\mu\textrm{m}$Dual Gate 고전압 공정에 관한 연구)

  • 송한정;김진수;곽계달
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.463-466
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    • 2000
  • According to the development of the semiconductor micro device technology, IC chip trends the high integrated, low power tendency. Nowadays, it can be showed the tendency of single chip in system level. But in the system level, IC operates by multi power supply voltages. So, semiconductor process is necessary for these multi power operation. Therefore, in this paper, dual gate high voltage device that operate by multi power supply of 5V and 20V fabricated in the 0.5${\mu}{\textrm}{m}$ CMOS process technology and its electrical characteristics were analyzed. The result showed that the characteristics of the 5V device almost met with the SPICE simulation, the SPICE parameters are the same as the single 5V device process. And the characteristics of 20V device showed that gate length 3um device was available without degradation. Its current was 520uA/um, 350uA/um for NMOS, PMOS and the breakdown voltages were 25V, 28V.

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Development of 4MW Class High Voltage Inverter System (4MW급 고압 인버터 시스템 개발)

  • 박영민;한기준;최세경;정명길;이세현
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.5
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    • pp.432-437
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    • 2001
  • This paper describes a new developed 3.3KV/4MW class three-level Voltage Source Inverter(VSI), which is equipped with IIMS(Inverter Information Management System) based on the world wide web and with the Virtual operation simulator. The algorithm for motor control is the stator oriented Direct Torque Control(DTC), which works without speed sensor and gives the physically fastest dynamic response. The IIMS have the functions of operation monitoring and data managements. Virtual operation simulator can analyze and tune the system characteristics without main power. Now, this system is under the field test to verify the confidence.

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Operation Characteristics of Open Type Geothermal Heat Pump (개방형 지열 히트펌프 시스템의 운전 특성)

  • Lim, Hyo-Jae;Kong, Hyoung-Jin;Song, Yoon-Seok;Park, Seong-Koo
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.701-706
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    • 2006
  • Groundwater heat pump systems are the oldest of the ground-souce systems and it has various type. Standing column well type are must be located in hard rock geology site and produce sufficient water for the conventional open loop system. These system are indirect type(the building circulating loop and ground water are intercept). Existence of the exchanger the foundation protect water quality to use of open loop. The design of open loop system are concern on the power requirements. An experimental study was analysis the extremely heating operation COP of ground water heat pump system. Operation efficiency of the 50RT systems shows that, COP $2.9{\sim}5.0$ in heating operation. And generally it shows 3.4.

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Designing on Scenario-based Drone Platform to Enhancement Security (보안성 향상을 위한 시나리오 기반 드론 플랫폼 설계 연구)

  • Kim, Yanghoon;Hong, Chan-Ki
    • Journal of Platform Technology
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    • v.9 no.3
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    • pp.78-83
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    • 2021
  • The new industry drone research is increasing through convergence between 4th industrial revolution technology. In particular, the government indicates the D.N.A platform as a countermeasure of 4th industrial revolution. So, the research topics are remarkable which are using D.N.A platform. On the other hand, the drone for industrial and research has spatial factor based on sequential because, they performance scenario-based mission through control operation. When the drone flights as a control operation, they have necessity apply multi-dimensional methods to improve the security level. So, this study researched a scenario based drone platform to improve the security level. As a result, the space classified as a ground control system, drone, drone data server and designed the application method based on scenario security technology.

Neutronic and thermohydraulic blanket analysis for hybrid fusion-fission reactor during operation

  • Sergey V. Bedenko ;Igor O. Lutsik;Vadim V. Prikhodko ;Anton A. Matyushin ;Sergey D. Polozkov ;Vladimir M. Shmakov ;Dmitry G. Modestov ;Hector Rene Vega-Carrillo
    • Nuclear Engineering and Technology
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    • v.55 no.7
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    • pp.2678-2686
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    • 2023
  • This work demonstrates the results of full-scale numerical experiments of a hybrid thorium-containing fuel plant operating in a state close to critical due to a controlled source of D-T neutrons. The proposed facility represented a level of generated power (~10-100 MWt) in a small pilot. In this work, the simulation of the D-T neutron plasma source operation in conjunction with the facility blanket was performed. The fission of fuel nuclei and the formation of spatial-energy release were studied in this simulation, in pulsed and stationary modes of the facility operation. The optimization results of neutronic and fluid dynamics studies to level the emerging offsets of the radial energy formed in the volume of the facility multiplying part due to the pulsed operation of the D-T neutron plasma source were presented. The results will be useful in improving the power control-based subcriticality monitoring method in coupled systems of the "pulsed neutron source-subcritical fuel assembly" type.

Design of New Channel Codes, MLC(Multi-Level Code), with Fast Coding Time for Processing of Multimedia Data (멀티미디어 데이터를 위한 빠른 처리 속도를 가지는 새로운 채널코드, MLC(Multi-Level Code)의 설계)

  • 공형윤;이창희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.11B
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    • pp.1864-1871
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    • 2000
  • 본 논문에서는 차세대 무선 통신 시스템에 적용이 가능한 새로운 FEC(Forward Error Correction) 부호화 방법으로 MLC(Multi-Level Convolutional) 부호화 방식을 제안한다. 차세대 무선통신서비스는 음성, 데이터, 영상 등 많은 종류의 서비스를 함으로써 데이터의 처리속도가 빠른 시스템이 요구된다. 데이터 처리시간을 단축시키기 위한 방법으로 다중 레벨을 이용하여 부호어를 만들어 내는 방식의 부호화 시스템을 설계하였다. MLC는 부호 처리시간을 단축시킬 뿐만 아니라 다양한 알고리즘을 이용해 부호어를 만들어 낼 수 있다는 특징을 가지게 된다. 모의실험은 MLC 코드의 두 가지 방법, Modulo- operation 방식과 Galois Field-Operation 방식을 이용하여 수행하였다. 또한 모의실험을 통하여 (s=2, T=2)인 경우가 MLC 부호기의 최적 연결다항식임을 알았다.

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Efficient Operation Policy in a Closed-loop Tire Manufacturing System with EPR

  • Ko, Young-Dae;Hwang, Hark
    • Industrial Engineering and Management Systems
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    • v.8 no.3
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    • pp.162-170
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    • 2009
  • This paper deals with a closed-loop remanufacturing system with one manufacturer and one remanufacturer. The manufacturer sells new products bearing the 'Extended Producer Responsibility (EPR).' It is assumed that the manufacturer's collection rate of used products depends only on the buy-back cost, while that of the remanufacturer depends on the minimum allowed quality level of used products in addition to the buy-back cost. Through the development of mathematical models with the objective function of maximizing profit, we study an efficient operation policy of each party. The decision variables are the unit selling price of new products and remanufactured products, the unit buy-back cost of the used products of the manufacturer and remanufacturer, and the minimum allowed quality level. The validity of the model is examined through numerical examples and sensitivity analysis.

Probabilistic Precontract Pricing for Power System Security (전력계통 안정성확보를 위한 확률적 예약요금제)

  • 임성황;최준영;박종근
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.2
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    • pp.197-205
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    • 1994
  • Security of a power system refers to its robustness relative to a set of imminent disturbances (contingencies) during operation. The socially optimal solution for the actuall level of generation/consumption has been well-known spot pricing at shot-run marginal cost. The main disadvantage of this approach arises because serious contingencies occur quite infrequently. Thus by establishing contractual obligations for contingency offering before an actual operation time through decision feedback we can obtain socially optimal level of system security. Under probabilistic precontract pricing the operating point is established at equal incremental cost of the expected short-run and collapse cost of each participant. Rates for power generation/consumption and for an offer to use during a contingency, as well as information on the probability distribution of contingency need for each participant, are derived so that individual optimization will lead to the socially optimal solution in which system security is optimized and the aggregate benefit is maxmized.

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