• Title/Summary/Keyword: bus demand

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Development of KNX/EIB-based Communication Module (KNX/EIB 프로토콜 기반의 통신 모듈 개발)

  • Park, D.K.;Lee, W.S.;Hong, S.H.;Hwang, T.Y.
    • Proceedings of the KIEE Conference
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    • 2007.04a
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    • pp.420-422
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    • 2007
  • Nowadays, the demand for home networking system is gradually increasing. But most of vendors use their own protocols. KNX/EIB ( European Installation Bus / Konnex) is a standard protocol approved as an European (EN 50090 - EN 13321-1) and a World-wide standard (ISO/IEC 14543). In this study, we develop on/off and dimming lighting control system using BIM. In this system, BIM communicates to micro-controller using PEI(Physical External Interface) communication. And this enables including more KNX/EIB communication objects in lighting control system, and providing lighting control algorithm. The technology in this paper can help to adapt the world-wide standards.

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A Development of On-Line Guidance System for Power System (전력 계통 이상 상태 Guidance System 개발)

  • Oh, Seung-Ryle;Baek, Young-Sik;Kim, Jung-Nyun;Han, Moo-Ho
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.47-49
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    • 2002
  • Recently, the power system has a trend of a sustaining growth in electric power demand with large-sized formation. In this situation, current states can be definitely comprehended to operate security and economic power system. Also, corrective actions must be performed for the violation of bus voltage and line overload. In the security and economy with on-line, It is desirable that the situations of violation are promptly removed to operate power system effectively. This paper deals with the development of application, Kangyang Steel Works' Power System Guidance System, for voltage and overload correction on base case using Generator-Voltage Sensitivity List(GVSL) and Generator Shifter Factor List(GSFL). Also, to show the superiority and economical efficiency of the proposed application, we simulate the Kangyang Steel Works' Power System.

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On Fault Current Limitering and Design Method of the Specific Parameter of Superconducting Fault Current Limiter (초전도고장전류제한기의 고장전류억제효과와 동작파라메타 설정방법에 대한고찰)

  • Hong, Won-Pyo;Kim, Jung-Hoon
    • Proceedings of the KIEE Conference
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    • 1997.07c
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    • pp.972-974
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    • 1997
  • Design & Operation of power system for meeting increase of electric Power demand is becoming more difficult and complex. One of reasons is increase of fault current. As one of the most effective methods for suppressing the fault current installation of SFCL is expected. These paper describes a method of fault analyses of power system with SFCLs, and also discusses determination of specification of SFCLs, effects of limiting the fault current due to SFCLs by use of the model system of two - bus electric power system with single transmission lines.

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A Load Flow Based Approach to Transaction Cost Allocation in Transmission Network (조류계산에 기초한 탁송요금 계산)

  • Park, Young-Moon;Lim, Jung-Uk;Won, Jong-Ryul;Park, Jong-Bae
    • Proceedings of the KIEE Conference
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    • 1997.07c
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    • pp.1149-1152
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    • 1997
  • This paper describes a novel approach for allocating transmission costs among users of transmission services. In the suggested approach, the cost share of each participant is proportional to amount of its line flow. To develop individual user's impact, the line utilization factors of each participant are derived by power flow equations of all nodes (i.e., load-flow equations). To deal With the slack bus problem inherent in the conventional load-flow analysis more practically, a additional power supply/demand balance equation is incorporated. Although the developed allocation rule is basically similar to the existing MW-mile method in the aspect of embedded cost allocation, it does not require to get load flow solutions of each wheeling transaction when multiple transmission transactions are considered.

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The flexible network implementation of TMDS in case of multiple unit and variable train-set (중련 및 가변편성에서의 TMDS의 유연한 network 적용)

  • Shin, Kwang-Kyun;Han, Jeong-Su;Kim, Chul-Ho
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.141-147
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    • 2009
  • This paper reports on a study to increase the flexibility of previous TMDS(Train Monitoring and Diagnosis System) network communication in case of both multiple units and variable train sets. The previous TMDS network configuration has been applied using various field-BUS by the TMDS manufacturers using their own intrinsic method. But recently, there has been a demand for flexible train formations such as multiple units and variable train set formations, hence the TMDS had to be adapted to offer flexible network communication technology capability. Therefore, Hyundai-Rotem needed its intrinsic method of network configuration, and develop a network configuration method applicable to both multiple units and variable train set formations. The TMDS was integrated into the Irish Rail new Diesel Multiple Units from an early stage of the project and subsequently fully tested on a finished train.

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Analysis on Voltage Sag in Power Distribution System according to SFCL's Impedance for Protective Coordination with Large Transformer (배전계통에 대용량변압기 교체 적용시 초전도 한류기의 임피던스에 따른 순간전압 분석)

  • Kim, Jin-Seok;Moon, Jong-Fil
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.312-316
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    • 2014
  • In this paper, a voltage sag is analyzed in case of superconducting fault current limiter (SFCL) installed in power distribution system where replaces the main power transformer to large one to meet the power demand. First, the power system is configurated to analyze the operation characteristics of the protective relay with replacement of the main transformer and application of the SFCL. Next, the method to meet the protection coordination is analyzed with large transformer using PSCAD/EMTDC. Finally, the bus voltage is investigated according to the impedance of both main transformer and SFCL in case that the SFCL is applied into feeder.

On Setting Method of the operating Parameters of SFCL in Transmission Systems Considering Power Protection Relay (계통보호릴레이와의 협조를 고려한 SFCL의 동작파라메타 설정방법에 대한고찰)

  • Hong, Won-Pyo
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1231-1234
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    • 1998
  • Design & Operation of power system for meeting increase of electric power demand is becoming more difficult and complex. One of reasons is increase of fault current. As one of the most effective methods for suppressing the fault current, installation of SFCL is expected. This paper describes a method of fault analyses of power system with SFCLs, and also discusses determination of specification of SFCLs, effects of limiting the fault current due to SFCLs by use of the model system of two - bus electric power system with parallel circuit model transmission line. Also, describes the definition of six specific parameters of SFCL for power system application & a proposal of design method of specific parameter of a resistance type SFCL in overhead transmission lines considering operation of protective relays.

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A Study for Load Supplying Margin of Transmission Networks (송전계통에서의 공급능력여유의 평가에 관한 연구)

  • Song, Kil-Yeong;NamKung, Jae-Yong;Choi, Jae-Seok;Kim, Yong-Ha
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.513-515
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    • 1995
  • Based on the concept of Load Supplying Capability of a transmission network, we provides an information concerning network adequacy. In particular this paper describes an algorithm regarding load supplying margin of transmission networks. And a different growth rate is assigned to each load point so that various demand characteristics can be taken into consideration at respective locations. In addition to this, in this paper, both generation and transmission equipment will be considered in determining the system capability. A 10 bus model system is used to demonstrate the capability of the proposed algorithm.

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A study on the Multipurpose Usage of Incheon International Airport Railway - Focusing on the Improvement of Connecting Systems - (인천국제공항철도의 다목적 활용방안 - 연계체계 개선을 중심으로)

  • Park Jeong-Soo;Won Jai-Mu;Han Woo-Jin
    • Journal of the Korean Society for Railway
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    • v.8 no.6 s.31
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    • pp.610-616
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    • 2005
  • The Incheon International Airport Express(I'Rex) is the railroad that connects Incheon International Airport, Gimpo Airport and Seoul Station. I'Rex is now under construction, and it will be connected to Gimpo Airport by 2007, to Seoul Station by 2010. However, there has been no discussion on how th connect different routes of railway Systems. Therefore it seems likely that rail passenger demand will be lower than that of limousine bus. Therefor, this paper proposes 4 effective connecting methods for I'Rex - (1) Shuttle transport, (2) Short-distance connecting transport (Inside I'Rex, Seoul Subway Line 9, 'Han-River line') (3) Mid-distance connecting transport (Jung-ang, Tae-baek, Young-dong line) (4) Long-distance connecting transport (Korean Train Express (Korean high speed railroad)) These methods can increase the connectivity of I'Rex with existing railroads and the competition power of I'Rex against a highway.

Economic Power Dispatch with Discontinuous Fuel Cost Functions using Improved Parallel PSO

  • Mahdad, Belkacem;Bouktir, T.;Srairi, K.;Benbouzid, M.EL.
    • Journal of Electrical Engineering and Technology
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    • v.5 no.1
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    • pp.45-53
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    • 2010
  • This paper presents an improved parallel particle swarm optimization approach (IPPSO) based decomposed network for economic power dispatch with discontinuous fuel cost functions. The range of partial power demand corresponding to the partial output powers near the global optimal solution is determined by a flexible decomposed network strategy and then the final optimal solution is obtained by parallel Particle Swarm Optimization. The proposed approach tested on 6 generating units with smooth cost function, and to 26-bus (6 generating units) with consideration of prohibited zone effect, the simulation results compared with recent global optimization methods (Bee-OPF, GA, MTS, SA, PSO). From the different case studies, it is observed that the proposed approach provides qualitative solution with less computational time compared to various methods available in the literature survey.