• Title/Summary/Keyword: Regional transmission loss

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Analysis on Characteristics of Regional Transmission Loss based on the KEPCO's Peak Load Data of Year 2000 (2000년 하계 첨두시의 지역별 송전손실 특성분석)

  • NamKung, J.Y.;Choi, H.K.;Moon, Y.H.;Rim, S.H.;Han, Y.H.
    • Proceedings of the KIEE Conference
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    • 2000.11a
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    • pp.20-22
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    • 2000
  • The transmission networks are not perfect conductors and a percentage of the power generated is therefore lost before it reaches the loads. This network loss contributes to the cost of suppling power to consumers, and must be considered if the most efficient dispatch and location of generators and loads is to be achieved. In this paper, we propose an approximate calculation of marginal loss factors to analyze characteristics of regional transmission loss. These static marginal loss factors are approximately calculated based on the KEPCO's expected summer peak load data of year 2000.

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Analysis on Characteristics of Transmission Loss using Marginal Loss Factors Based on the KEPCO's Expected Peak Load Data of Year 2000 (한계손실계수에 의한 한전 예상첨두계통 송전손실 특성 분석)

  • NamKung, Jae-Yong;Choe, Heung-Gwan;Mun, Yeong-Hwan;O, Tae-Gyu;Im, Seong-Hwang;Han, Yong-Hui
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.7
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    • pp.333-339
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    • 2001
  • The transmission networks are not perfect conductors and a percentage of the power generated is therefore lost before it reaches the loads. This network loss effects to the cost of suppling power to consumers, and must be considered if the most efficient dispatch and location of generators and loads is to be achieved. In this paper, we propose an approximate calculation of marginal loss factors to analyze characteristics of transmission loss of KEPCO power system. These static marginal loss factors are approximately calculated based on the KEPCO's expected summer peak load data of year 2000.

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Coordinated Wide-Area Regulation of Transmission System for Voltage Profile Improvement and Power Loss Reduction

  • Asadzadeh, Babak;Golshannavaz, Sajjad
    • Transactions on Electrical and Electronic Materials
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    • v.18 no.5
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    • pp.279-286
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    • 2017
  • In this paper, an optimal approach for the wide-area regulation of control devices in a transmission network is proposed. In order to realize an improved voltage profile and reduced power loss, existing devices such as tap-changing transformers, synchronous machines, and capacitor banks should be controlled in a coordinated and on-line manner. It is well-understood that phasor measurement units in transmission substations allow the system operators to access the on-line loading and operation status of the network. Accordingly, this study proposes efficient software applications that can be employed in area operation centers. Thus, the implanted control devices can be regulated in an on-line and wide-area coordinated approach. In this process, efficient objective functions are devised for both voltage profile improvement and power loss reduction. Subsequently, sensitivity analysis is carried out to determine the best weighting factors for these objectives. Extensive numerical studies are conducted on an IEEE 14-bus test system and a real-world system named the Azarbayjan Regional Transmission Network. The obtained results are discussed in detail to highlight the promising improvements.

Analysis of Regional MLF Characteristics on 12 Load Cases (부하시점에 따른 지역별 한계손실계수 변동특성 분석)

  • NamKung, J.Y.;Moon, Y.H.;Oh, T.K.;Rim, S.H.
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.333-335
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    • 2001
  • The transmission networks are not perfect conductors and a percentage of the power generated is therefore lost before it reaches the loads. This network loss contributes to the cost of suppling power to consumers, and must be considered if the most efficient dispatch and location of generators and loads are to be achieved. In this paper, marginal loss factors are calculated for 12 load cases that represent the impact of marginal network losses on nodal prices at the transmission network connection points. Based on comparison analysis of marginal loss factors for 12 loaf cases, we can find the regional MLF characteristics in KOREA.

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A hybrid model of regional path loss of wireless signals through the wall

  • Xi, Guangyong;Lin, Shizhen;Zou, Dongyao
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.16 no.9
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    • pp.3194-3210
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    • 2022
  • Wall obstruction is the main factor leading to the non-line of sight (NLoS) error of indoor localization based on received signal strength indicator (RSSI). Modeling and correcting the path loss of the signals through the wall will improve the accuracy of RSSI localization. Based on electromagnetic wave propagation theory, the reflection and transmission process of wireless signals propagation through the wall is analyzed. The path loss of signals through wall is deduced based on power loss and RSSI definition, and the theoretical model of path loss of signals through wall is proposed. In view of electromagnetic characteristic parameters of the theoretical model usually cannot be accurately obtained, the statistical model of NLoS error caused by the signals through the wall is presented based on the log-distance path loss model to solve the parameters. Combining the statistical model and theoretical model, a hybrid model of path loss of signals through wall is proposed. Based on the empirical values of electromagnetic characteristic parameters of the concrete wall, the effect of each electromagnetic characteristic parameters on path loss is analyzed, and the theoretical model of regional path loss of signals through the wall is established. The statistical model and hybrid model of regional path loss of signals through wall are established by RSSI observation experiments, respectively. The hybrid model can solve the problem of path loss when the material of wall is unknown. The results show that the hybrid model can better express the actual trend of the regional path loss and maintain the pass loss continuity of adjacent areas. The validity of the hybrid model is verified by inverse computation of the RSSI of the extended region, and the calculated RSSI is basically consistent with the measured RSSI. The hybrid model can be used to forecast regional path loss of signals through the wall.

A Numerical Method to Calculate Drainage Time in Large Transmission Pipelines Filter (대구경 관로의 배수시간 산정을 위한 수치해석 기법)

  • Shin, Byoung-Ho;Choi, Doo-Yong;Jeong, Kwansue
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.6
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    • pp.511-519
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    • 2017
  • Multi-regional water supply system, which installed for supplying multiple water demands, is characterized by large-sized, long-distance, tree-type layout. This system is vulnerable to long-standing service interruption when a pipe breaks is occurred. In this study, a numerical method is proposed to calculate drainage time that directly affects time of service interruption. To begin with, governing equations are formulated to embed the delayed drainage effect by the friction loss, and to resolve complicated connection of pipelines, which are derived from the continuity and energy equations. The nonlinear hydraulic equations are solved by using explicit time integration method and the Newton-Raphson method. The developed model is verified by comparing the result with analytical solution. Furthermore, the model's applicability is validated by the examples of pipelines in serial, in parallel, and complex layout. Finally, the model is utilized to suggest an appropriate actions to reduce the deviation of draining time in the C transmission line of the B multi-regional water supply system.

An Efficient Design of a DC-Block Band Pass Filter for the L-Band

  • Kaur, Avneet;Malhotra, Jyoteesh
    • Transactions on Electrical and Electronic Materials
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    • v.18 no.2
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    • pp.62-65
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    • 2017
  • In this paper, three DC Block designs are presented which efficiently meet the need of modern-day compactsize wireless communication systems. As one of the important parts of a complete system design, the proposed microstrip-based DC block with coupled transmission lines efficiently attenuates unwanted frequencies that cause damage to the system. The compact-sized DC block structures are created by incorporating an extended coupled-line section with a radial stub, an enveloped coupled-line section, and using alternate up-down meandering techniques. The structures are analyzed for the L-Band using a high-resistive silicon substrate. At a resonating frequency of 1.575 GHz, the designed DC Block structures have a return loss better than -10 dB, an insertion loss of around -1 dB, and also possess wide pass-band characteristics.

RF-MEMS-Based DPDT Switch on Silicon Substrate for Ku-Band Space-Borne Applications

  • Singh, Harsimran;Malhotra, Jyoteesh
    • Transactions on Electrical and Electronic Materials
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    • v.18 no.1
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    • pp.16-20
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    • 2017
  • A RF-MEMS (radio-frequency microelectromechanical-system) based DPDT (double pole double throw) switch for the Ku band has been designed and analyzed for this article. The switch topology is based on the FG-CPW (finite ground-coplanar waveguide) configuration of a microstrip-transmission line. An FEM-based multiphysics solver is used for the evaluation of the spring constant, stress distribution, and pull-in voltage regarding the requirements of the switch-beam unit. The electromagnetic performance of the switch is investigated for a $675{\mu}m$ thick silicon substrate. For the operational frequency of 14.5 GHz, an insertion loss better than -0.3 dB, a return loss better than -40 dB, and input/output- and output-port isolations better than -35 dB are achieved for the switching unit.

Transmission Scheme for Improving QoS of Multimedia Contents (멀티미디어 콘텐츠의 QoS를 개선한 전송 메커니즘)

  • Kim Seonho;Song Byoungho
    • The KIPS Transactions:PartB
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    • v.12B no.2 s.98
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    • pp.167-172
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    • 2005
  • A rapid growth in the number of Internet users and in massive media contents tends to cause server overload and high network traffic. As a consequence, it can be safely assumed that the quality of service is on the brink of deterioration. A solution of this problem is the development of the Content Distribution Network. Therefore, in this paper, we propose a transmission model using CDN. This model uses regional media server which closes to client, and uses MDC coding and multi-channel to reduce packet loss and delay. In conclusion, this study improved performance of multimedia service by reducing packet loss and delay.

A Critique of Designing Resource Adequacy Markets to Meet Loss of Load Probability Criterion

  • Yoon, Yong T.;Felder, Frank A.
    • KIEE International Transactions on Power Engineering
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    • v.3A no.1
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    • pp.35-41
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    • 2003
  • To ensure resource adequacy in restructured electricity markets, policymakers have adopted installed capacity (ICAP) markets in some regions of the United States. These markets ensure that adequate generation exists to satisfy regional Loss of Load Probability(LOLP) criterion. Since the incentives created through ICAP mechanisms directly impact new generation and transmission investment decisions we examine one important factor that links ICAP markets with LOLP calculations;, determining the amount of ICAP credit assigned to particular generation units. First, we review and critique the literature on electric power systems' market failure resulting from demand exceeding supply. We then summarize the method of computing (the LOLP) as a means of assessing reliability and relate this method to ICAP markets. We find that only the expected value of available generation is used In current ICAP markets while ignoring the second and higher order moments, which tends to mis-state the ICAP value of a specific resource. We then consider a proposal whose purpose is to avoid this ICAP assignment issue by switching from ICAP obligations to options. We find that such a proposal may fail to not provide the benefits claimed and suffers from several practical difficulties. Finally, we conclude with some policy recommendations and areas for future research.