• Title/Summary/Keyword: Power demand and supply

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Measurement and Analysis of Voltage Drop in Traction Power Supply System (전기철도 급전시스템의 안정화를 위한 전압강하 측정 결과 분석)

  • Kim, Joo-Rak;Lee, Young-Heum
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2210-2211
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    • 2011
  • Load capacity varies according to a day of the week in traction power supply system, because time schedule in railway is changed as demand for passengers and freights. Therefore, Voltage drop also varies as load capacity. In Korea railway, Voltage collected from catenary in train is decreased, as load supplied traction power supply system is increased. Therefore, investigation about voltage drop should be performed, before development of countermeasure against voltage drop. The investigation can be performed by simulation or field test. Naturally, field test is more precise than simulation. In addition, field test should be carried out at peak load. This paper presents test and analysis about voltage drop in railway. The test is performed in both a day of the week and weekend. The analysis is figured out comparison load capacity between two days and voltage drop across terminal.

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A Study on EV Charging Scheme Using Load Control

  • Go, Hyo-Sang;Cho, In-Ho;Kim, Gil-Dong;Kim, Chul-Hwan
    • Journal of Electrical Engineering and Technology
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    • v.12 no.5
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    • pp.1789-1797
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    • 2017
  • It is necessary to charge electric vehicles in order to drive them. Thus, it is essential to have electric vehicle charging facilities in place. In the case of a household battery charger, the power similar to that consumed by a household with a basic contract power of 3kW is consumed. In addition, many consumers who own an electric vehicle will charge their vehicles at the same time. The simultaneous charging of electric vehicles will cause the load to increase, which then will lead to the imbalance of supply and demand in the distribution system. Thus, a smart charging scheme for electric vehicles is an essential element. In this paper, simulated conditions were set up using real data relating to Korea in order to design a smart charging technique suitable for the actual situation. The simulated conditions were used to present a smart charging technique for electric vehicles that disperses electric vehicles being charged simultaneously. The EVs and Smart Charging Technique are modeled using the Electro Magnetic Transients Program (EMTP).

Electrical Consideration in OPGW Live-Line Installation (활선 상태에서의 OPGW 가선 시 전기적인 현상 고찰)

  • Baek, Ju-Heum;Kim, Jung-Nyun;Jeon, Seung-Ik;Kim, Byung-Soo;Lee, In-Ho
    • Proceedings of the KIEE Conference
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    • 2005.07e
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    • pp.127-129
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    • 2005
  • OPGW(Optical Ground Wire) whose demand is increasing worldwide have composite function as optical communication and grounding for preventing transmission line from lightning. While continuous efforts have been made to increase the transmission capacity and speed, the working method to replace the existing ground wire with OPGW under live-line condition is coming to force newly as installation aspects. Particularly, this requirement became more serious in developing country that the electric power supply is not sufficient and power outage is impossible for supply and dead of electric power LS cable Ltd. has developed the new installation method in full live-line condition to solve the confronted problem and to meet the market demand. In this paper, Electric Problems in live-line installation is considered to predict dry-band arcing. This can be used by Makers to predict dry-band arcing in insulating ropes installed on earth wire of power transmission system.

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Prediction of the Electric Vehicles Supply and Electricity Demand Using Growth Models (성장모형을 활용한 전기자동차 보급과 전력수요 예측)

  • Hyo Seung Han;Ilsoo Yun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.22 no.4
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    • pp.132-144
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    • 2023
  • European and American countries are actively promoting eco-friendly cars to reduce exhaust emissions from internal combustion engines. In Korea, the "4th Basic Plan for Eco-Friendly Vehicles" aims to promote eco-friendly cars by improving charging infrastructure, expanding incentive systems, and targeting the supply of 1.13 million eco-friendly cars by 2025. As rapid growth in the number of electric vehicles sold is expected, estimates are required of this growth and corresponding power demands. In this study, the authors used a growth model to predict future growth in the electric vehicle market and a previously derived electricity generation model to estimate corresponding power demands up to 2036, the target year of the "10th Basic Plan for Power Supply and Demand". The results obtained provide useful basic research data for future electric vehicle infrastructure planning.

A Study on the Operation Strategies of Multi-Infeed HVDC System in Jeju Island Power System (제주지역 계통특성을 고려한 다기(Multi-Infeed) HVDC 시스템 운전 방안에 관한 연구)

  • Lee, Seung-Yeup;Yoon, Min-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.12
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    • pp.1675-1681
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    • 2017
  • As recently the demand on electric power has been increasing, the requirement of power supply reliability has been increased. Accordingly, the number of HVDC transmission systems in the world has been steadily increased, which have been installed in the power system to transmit a large capacity power to the long distant and interconnect the power grid between different countries. etc. #1 HVDC Transmission System was installed between Haenam and Jeju island in 1998, which is the first HVDC system furnished in korea. and has been operated until now. Before #1 HVDC Transmission System being installed, the power system of the Jeju Island is a isolated power system from that of Korea mainland. After the construction of #1 HVDC the system has made the Jeju power system more reliable and also been able to supply the mainland power, which was cheaper than that of Jeju island, to Jeju island. The construction of additional HVDC transmission system between mainland and the Jeju Island has been currently underway to cope with recent changes of the power market of the Jeju island, for examples the increase of power demand and the capacity of wind power generation. etc. #2 HVDC Transmission System construction was completed in 2012. #3 HVDC Transmission System will be also installed according to the plan. If all goes as planned, the Jeju power system will be operated with Multi-Infeed HVDC system connected to mainland power system. So the additional studies are needed in order to maintain the stability of the Jeju power system and get the efficiency of the Multi-Infeed HVDC system. Therefore, in this paper, the optimal operation strategies of the Multi-Infeed HVDC system between the mainland of Korea and the Jeju are suggested to ensure the stability of the power system in Jeju Island when the Multi-Infeed HVDC system is operated between two power system.

Planning for Construction and Expanding of Distribution Substation Considering Contingency (상정사고를 고려한 배전용 변전소 신,증설 계획 수립)

  • Choi, Sang-Bong;Kim, Dae-Kyeong;Jeong, Seong-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.7
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    • pp.303-308
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    • 2001
  • This paper presents algorithm to plan construction and expanding of substation considering contingency accidents by proposing utilization factor according to configuration of substation bank system. In this paper, firstly, proper sphere of supply area by each district which could be standardized with respect to its supply capacity is established under assumption of long term load forecasting. Secondly, goal of utilization ratio based on configuration of substation bank was set to keep reliability by remaining sound bank when it happen to one bank accidents. Finally, it is set up for optimal construction and expanding of substation considering economy and reliability simultaneously about substation to exceed these ratio. To verify proposed algorithm, at first, after adopting a part of Kangnam area in Seoul as area for testing, it is divided into several regions for this area according to power branches of power utility. Secondly, by deriving correlation factor between load demand and economic indicators in these region respectively, the regional load forecasting was performed with economic growth and city plan scenario. Finally, based on the predicted load demand by region and land use data which is identified from air-photographic, the load demand by district was predicted. Also, planning for substation considering contingency is formulated to expand taking into account computing utilization factor which is based on configuration of substation bank respectively.

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A Survey Research for Power Demand Forecast Criteria of new Industry Complex (산업수용가에 대한 전력수요 예측기준에 관한 조사연구)

  • Nam, Kee-Young;Choi, Sang-Bong;Jeong, Seong-Hwan;Ryoo, Hee-Suk;Kim, Dae-Kyung
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.86-88
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    • 2003
  • New cities and industrial complexes are being developed actively according to the government's policy. To determine the size of investment, number of power lines and substations for stable power supply to newly developed industrial complexes, the accurate estimation of power demand is necessary. "The standards for the estimation of power demands in newly developed residential and industrial complexes" established by KEPCO in 1991 have been used up to now. But the background for the estimation of power demands is weak and the accuracy has not been verified. Also, it has been passed above 10 years since their establishment and the social & economic situations have changed a lot, which requires an urgent revision. Through this survey and analysis of existing areas, new standards that will enable more accurate estimation of power demands in new cities and industrial complexes to be developed in the future are established by calculating the some kinds of power demand factors.

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The Effect of HVDC#3 on Jeju Power System (제주 HVDC#3 영향 분석)

  • Park, Jung-Soo;Jung, Hong-Ju;Han, Young-Seong;Kim, Rae-Young;Chung, Chung-Choo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2196-2201
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    • 2011
  • According to the 5th national plan for electric power demand and supply, the 3rd HVDC link will be installed between KEPCO and Jeju Island system and go into operation in June, 2016. However, if it adopt LCC HVDC, Jeju power system could be in voltage instable condition. In order to solve the problem, we propose the application of VSC HVDC to the 3rd HVDC project. In the past, VSC HVDC has many disadvantages such as, inefficiency in conversion, size limit, and expensiveness, compared to LCC HVDC. Recently, the new technologies and the demand for renewable energy interconnection are leading a large growth in VSC HVDC market. In this paper, we will introduce the technical and market trends of VSC HVDC and power system stability analysis results for Jeju power system having LCC and VSC HVDCs.

Analysis of Electromagnetic Field Around Distribution Line (배전선로 주변에서의 전자계 분포 해석)

  • Kwon, Myung-Rak
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.10
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    • pp.672-676
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    • 2017
  • Electrical energy is playing an increasingly vital role as the primary energy source in everyday life. With the increase in electric power consumption, power facilities are under an increasing stress and must operate at a high capacity. Consequently, the demand for electric power cables in power transmission and distribution lines is rapidly increasing. Underground distribution lines have been steadily replacing the aboveground lines owing to the increase in electric power demand and the need to increase the supply voltage. In addition to line damage, worker safety is of primary concern in this type of underground infrastructure. In this study, to improve the safety of workers dealing with underground transmission lines, we analyzed the electromagnetic field generated around the distribution line and determined the basic criteria for developing a device that can detect a live underground line.

Regional Electricity Demand Forecasting for System Planning (계통계획을 위한 지역별 전력수요예측)

  • Jo, I.S.;Rhee, C.H.;Park, J.J.
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.292-294
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    • 1998
  • It is very important for electric utility to expand generating facilities and transmission equipments in accordance with the increase of electricity demand. Regional electricity demand forecasting is among the most important step for long-term investment and power supply planning. The main objectives of this paper are to develop the methodologies for forecasting regional load demand. The Model consists of four models, regional economy, regional electricity energy demand, areal electricity energy demand. and areal peak load demand. This paper mainly suggests regional electricity energy demand model and areal peak load demand. A case study is also presented.

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