• Title/Summary/Keyword: distribution System

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The Simplified Economic Evaluation of Extra-High Voltage Distribution System in the Large Apartment Complex (대단위 아파트에서 특고압 배전시스템의 경제성 평가)

  • Yun, Man-Soo;Chung, Chan-Soo;Park, Hyung-Joon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.117-124
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    • 2007
  • This paper is about the Extra-High voltage distribution system in the customer's area. The power loss in the distribution system in the customer's area is disregarded and rarely managed so far. But, economically, this loss is not small quality to ignore. So, in this paper, we calculate the power loss of the Extra-High voltage distribution system in the customer's area by changing the locations of power transformer and other power facilities to decrease power loss in decreased secondary line length. And we also show the payback time of the proposed Extra-High voltage distribution system in the customer's area by simplified calculations.

Robust Control of Multi-Echelon Production-Distribution Systems with Limited Decision Policy (II)- Numerical Simulation-

  • Jeong, Sang-Hwa;Oh, Yong-Hun;Kim, Sang-Suk
    • Journal of Mechanical Science and Technology
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    • v.14 no.4
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    • pp.380-392
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    • 2000
  • A typical production-distribution system consist of three main echelons representing the retailer, distributors, and a factory each with an on-site warehouse. The system is sufficiently general and realistic to represent many industrial situations. However, decision functions and parameters have been selected to apply particularly to the production and distribution of consumer durables. The flows included in the model are materials, orders, and those information flows needed to support the material and order-rate decisions. In this work, a realistic production-distribution system has been used as a basic model, which consists of three sectors: retailer, distributor, and factory. That system is a nonlinear 25th-order continuous system interconnected between the echelons. Using a modern control algorithm, a typical multi-echelon production-distribution system using a dynamic controller is numerically simulated in the nominal plant and in the perturbed plant when the piecewise constant manufacturing decision is limited by a factory manufacturing upper-limit due to capital equipment, manpower, and factory lotsize.

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A Study of Re-Fuse Coordination Method of Distribution System with SFCL (배전계통에 초전도 전류제한기 적용 시 Relcoser-Fuse 협조 방법에 관한 연구)

  • Kim, Myoung-Hoo;Kim, Jin-Seok;You, Il-Kyoung;Moon, Jong-Fil;Lim, Sung-Hun;Kim, Jae-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.10
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    • pp.1835-1841
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    • 2009
  • We analyze the problem of recloser-fuse coordination when a superconducting fault current limiter (SFCL) is installed to a power distribution system. Generally, The recloser is installed to upstream of fuse to protect against both permanent fault and temporary one appropriately. However, in a power distribution system with SFCL, the fault current is decreased by the effect of the impedance value of the SFCL and when a permanent fault occurs, the fuse may not melt during the last delay operation of the recloser because of the insufficient heat from the decreased current. Therefore, when SFCLs are applied into a power distribution system, the rating of the fuse has to be reselected to coordinate recloser to fuse effectively. To solve these problems, this paper analysed the operation of recloser-fuse coordination and presented the improved recloser-fuse coordination method in a power distribution system with SFCL using PSCAD/EMTDC.

Modeling of Load Element for a Low Voltage DC Distribution System (저전압 DC 배전시스템 구성요소의 부하 모델링)

  • Gwon, Gi-Hyeon;Han, Joon;Oh, Yun-Sik;Kim, Eung-Sang;Kim, Chul-Hwan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.6
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    • pp.113-121
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    • 2014
  • At the end of the 19th century, a battle known as the War of the Currents was fought over how electricity would be generated, delivered, and utilized. In this day and age, there has been a growing interest in Green Growth policies as countermeasures against global warming. As a result of these policies, the use of new and renewable energy needed a power converter to replace fossil fuels has expanded. To reduce power consumption through high efficiency of conversion, Low Voltage DC (LVDC) distribution systems are suggested as an alternative. In a DC distribution system, DC loads are very efficient due to decrease the stages of power conversion. If the LVDC distribution system is adopted, not only DC load but also existing AC loads should be connected with LVDC system. Thus, the modeling of two loads is needed to analyze the DC distribution system. This paper, especially, is focused on the modeling of resistive load and electronic load including power electronic converters using ElectroMagnetic Transient Program (EMTP) software.

A Study on Detection of High Impedance Fault in Low Voltage DC Distribution System using Filter based on Mathematical Morphology (수학적 형태학 기반의 필터를 이용한 저압직류 배전계통의 고저항 지락고장 검출에 관한 연구)

  • Oh, Yun-Sik;Noh, Chul-Ho;Kim, Doo-Ung;Gwon, Gi-Hyeon;Han, Joon;Kim, Chul-Hwan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.11
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    • pp.89-95
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    • 2015
  • As a solution of improving the energy efficiency in power system, Low Voltage DC (LVDC) distribution systems different from conventional ones have been constantly researched. As in conventional AC distribution system, LVDC distribution system can suffer from High Impedance Fault (HIF) which may cause a failure of protective relay due to relatively low change in magnitude of fault current. In order to solve the problem, a scheme for detecting HIFs is presented in this paper. Closing Opening Difference Operation (CODO) based on Mathematical Morphology (MM), one of the MM-based filters, is utilized to make fault signals discriminable. To verify performance of the scheme, a simple LVDC distribution system is modeled by using ElectroMagnetic Transient Program (EMTP) software. Computer simulations according to various conditions are performed and comparison studies with a scheme using Wavelet Transform (WT) in an aspect of simulation time are also conducted.

Video Surveillance System Design and Realization with Interframe Probability Distribution Analyzation (인터프레임 확률분포분석에 의한 비디오 감시 시스템 설계 구현)

  • Ryu, Kwang-Ryol;Kim, Ja-Hwan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.6
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    • pp.1064-1069
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    • 2008
  • A system design and realization for video surveillance with interframe probability distribution analyzation is presented in this paper. The system design is based on a high performance DSP professor, video surveillance is implemented by analyzing interframe probability distribution using trivariate normal distribution(weight, mean, variance) for scanning objects in a restricted area and the video analysis algorithm is decided for forming a different image from the probability distribution of several frame compressed by the standardized JPEG. The system processing time of D1$(720{\times}480)$ image per frame is 85ms and enables to process the system at 12 frames per second. An object surveillance about the restricted area by rules is extracted to 100% unless object is moved faster.

A study on comparison of buying system between Discount Stores and Department Stores in Korea (국내의 할인점과 백화점 매입유형에 관한 비교 연구)

  • Youn, Myoung-Kil
    • Journal of Distribution Science
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    • v.2 no.2
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    • pp.1-15
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    • 2004
  • The distribution companies in Korea usually specify the buying system in jikmeip, tukjeongmeip, imdeeul, and imdegap. In this view, the development of distribution companies in Korea is highly dependent on the which business status is emphasized. And it is considered critical to identify the important features of each buying system and the impact these systems have on each business status. Subsequently, the purpose of this study is to identify the said features and impact. With this study, we have tried to explore a new vision for distribution taking a consideration of the fact that most studies within Korea are oriented in marketing standpoint. Particularly, we have intended to analyze the distribution industry in the view of internal standpoint of a distribution company.

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Proposed Distribution Voltage Control Method for Connected Cluster PV Systems

  • Lee, Kyung-Soo;Yamaguchi, Kenichiro;Kurokawa, Kosuke
    • Journal of Power Electronics
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    • v.7 no.4
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    • pp.286-293
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    • 2007
  • This paper proposes a distribution voltage control method when a voltage increase condition occurs due to reverse power flow from the clustered photovoltaic (PV) system. This proposed distribution voltage control is performed a by distribution-unified power flow controller (D-UPFC). D-UPFC consists of a hi-directional ac-ac converter and transformer. It does not use any energy storage component or rectifier circuit, but it directly converts ac to ac. The distribution model and D-UPFC voltage control using the ATP-EMTP program were simulated and the results show the voltage increase control in the distribution system.

The Development of Application Programs for Optimal Feeder Operation Through Distribution Automatic System

  • Ha, Bok-Nam;Seol, Ieel-Ho;Jeong, Mi-Ae
    • KIEE International Transactions on Power Engineering
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    • v.4A no.1
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    • pp.42-47
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    • 2004
  • This paper presents the various application programs for the Distribution Automation System (DAS) of the Korea Electric Power Corporation (KEPCO)'s distribution system. These programs are developed to allow for optimal operation in the areas of feeder automation, relay coordination, loss minimization and so on. They are single line diagram auto creation programs for the feeder, service restoration program, protection coordination program, data error detection program, and optimal network reconfiguration program. The details of these programs are presented for validity and effectiveness.

A Study on the Operation of Physical Distribution System with the Allocation of Safety Stock (안전재고입지를 고려한 물적 분배시스템 운영에 관한 연구)

  • 김병찬;김형준
    • Journal of the Korea Safety Management & Science
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    • v.3 no.3
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    • pp.77-86
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    • 2001
  • An operational strategy for inventory control on finished goods in the distribution system has been given attention to many enterprises and many studies regarding this field have been done and is also on-going currently. Many of these studies represented a large scale distribution network with a unified formulation by using defined symbols. These methods have provided the systematic approach of the distribution network but they are impossible to applying the reality system due to not considering the service rate of demand and treating the shortage of inventory. In order to overcome these unrealistic problems, the novel safety stock policy of responding to customers' inventory distribution network is suggested. this paper explores the transportation between Central Distribution Center(CDC) and Regional Distribution Center(RDC). Especially, the relation of transportation cost between CDC and RDC and cost of inventory control according to safety inventory with service level are emphasized. We could obtain the good results of this study by determining the optimal safety stock considering the various variables and constraints.

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