• Title/Summary/Keyword: EV charging

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The Qualitative Analysis of Lithium-Ion Battery Pulse Charging Algorithms for EV/PHEV (EV/PHEV용 리튬 이온 이차전지의 펄스 충전 알고리즘의 정성적 해석)

  • Lee, Eun-Ju;Jeong, Da-Youn;Jeon, Joon-Young;Shin, Seung-Min;Lee, Byoung-Kuk
    • Proceedings of the KIPE Conference
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    • 2010.11a
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    • pp.347-348
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    • 2010
  • 본 논문에서는 현재 EV/PHEV(전기자동차 및 하이브리드전기자동차)용으로 주목 받고 있는 리튬 이온 이차전지의 충전 알고리즘들 중에서 펄스(Pulse) 충전 알고리즘과 가변 주파수 펄스 충전 알고리즘을 CC/CV(정전류/정전압) 충전 알고리즘과 충전시간과 안정도, 전지 수명 부분에서 비교 및 분석한다. 그 결과 제시되는 펄스 충전 알고리즘의 장점을 기존의 결과론적인 분석에서 나아가 전기적, 화학적 근거를 통해 정성적으로 분석한다.

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An Analysis on the Stability of the Electric Vehicles Connected Power System According to Charging Cost with Price Elasticity (가격탄력성을 이용한 전기자동차 충전요금제에 따른 연계계통의 안정성 분석)

  • Kim, Junhyeok;Kim, Joorak;Kim, Chulhwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.9
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    • pp.1577-1582
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    • 2016
  • Now we are facing severe environmental issues such as global warming. Due to these, the concerns about eco-friendly energy have been increased. Kyoto protocol and Copenhagen climate change conference are circumstantial evidence of it. With these trends, the interests for the Electric Vehicles(EVs) which do not emit any harmful gases have gradually been raised. Unfortunately, however, massive connection of EVs to the power system could cause negative impacts such as voltage variations, frequency variations and increase of demand power. To prevent the mentioned issues, KEPCO adopts Time-of-Use(ToU) price for EVs charging. Nevertheless, it is important to verify the propriety of the charging system. In this paper, therefore, we used pre-introduced price elasticity concept to predict possible Demand Response(DR) on charging of EVs. And analyzed possible demand power increase according to various price elasticities. Simulation results show that given ToU based charging system would not enough to control the increase of demand power by EVs on the power system. It is concluded, therefore, additional methods and/or algorithms are required.

PFC and Zero Torque Control of SRM for EV Battery Charging (EV용 충전 인덕터용 PFC 및 제로 토크제어)

  • Rashidi, A.;Namazi, M.M.;Saghaian-nezhad, S.M.;Lee, D.H.;Ahn, J.W
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.652-654
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    • 2015
  • Integrated switched reluctance motor drive as an electric vehicle battery charger is presented in this paper. The SRM, which is used as the traction power in the driving mode, is used in the charge circuit to improve the power factor of charging system. The charging circuit can share the power switches of the asymmetric converter and phase windings of SRM to charge the battery, and can reduce the size and cost of the system in the plug-in system. To keep the rotor at standstill, zero torque control method is proposed. Since the inductances of the SRM windings are not same at any stop position, the charger controller controls the reference current to satisfy the total charging current with PFC and zero torque condition. A novel cubic equation method is proposed as a current reference distributor of the charging controller. Simulations are performed by MATLAB software and results satisfy the Effectiveness of proposed battery charging system.

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Analysis of Construction Plans of Rapid Charging Infrastructures based on Gas Stations in Rural Areas to Propagate Electric Vehicles (전기자동차 보급을 위한 농촌지역의 주유소 기반 급속 충전인프라 구축 방안 분석)

  • Kim, Solhee;Kim, Taegon;Suh, Kyo
    • Journal of Korean Society of Rural Planning
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    • v.21 no.1
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    • pp.19-28
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    • 2015
  • As environmental concerns including climate change drive the strong regulations for car exhaust emissions, electric vehicles attract the public eye. The purpose of this study is to identify rural areas vulnerable for charging infrastructures based on the spatial distributions of the current gas stations and provide the target dissemination rates for promoting electric cars. In addition, we develop various scenarios for finding optimal way to expand the charging infrastructures through the administrative districts data including 11,677 gas stations, the number of whole national gas stations. Gas stations for charging infrastructures are randomly selected using the Monte Carlo Simulation (MCS) method. Evaluation criteria for vulnerability assessment include five considering the characteristic of rural areas. The optimal penetration rate is determined to 21% in rural areas considering dissemination efficiency. To reduce the vulnerability, the charging systems should be strategically installed in rural areas considering geographical characteristics and regional EV demands.

Interference suppression method of between AMI system and EV charging system (AMI 시스템과 전기차 충전시스템 간의 간섭 억제 기법)

  • Park, Ju Hyun;Seo, Jong Kwan;Park, Chang-Un;Lee, Jae Jo;Kim, Jin Young
    • Journal of Satellite, Information and Communications
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    • v.9 no.1
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    • pp.74-78
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    • 2014
  • In this paper, we proposed Interference suppression method of between AMI system and EV charging system. IEC12139-1 and HomePlug GreenPhy are using 2-30Mhz frequency band in power line communication. Both method while using the same frequency band, interference occurs in the system of each other. In this paper, we experiment a way to suppress the interference through the channel separation using a Walsh code.

Operating Characteristics of Superconducting Wireless Power Transfer System for Electric Vehicle Charging (전기차 충전을 위한 초전도 무선전력전송 시스템의 동작 특성)

  • Chung, Yoon-Do;Lee, Chang-Young;Kim, Dae-Wook
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.22-23
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    • 2015
  • As wireless power transfer (WPT) technology using strongly coupled electromagnetic resonators is a recently explored technique to realize the large power delivery and storage without any cable or wire, this technique is required for diffusion of electric vehicles (EVs) since it makes possible a convenient charging system. Typically, since the normal conducting coils are used as a transmitting coil in the CPT system, there is limited to deliver the large power promptly in the contactless EV charging system. From this reason, we proposed the combination CPT technology with HTS transmitting antenna, In this study, we examined the improvement of transmission efficiency and properties for HTS and copper antennas, respectively, at 30 cm distance. Thus, we obtained improved transfer efficiency with HTS antenna over 10% compared with copper antenna

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Development of EV Charging Scheme Considering Distributed Generation and Energy Storage System (분산전원과 ESS를 고려한 전기 자동차 충전 기법 개발)

  • Sim, Bo-Seok;Kim, Jun-Hyeok;Lee, Soon-Jeong;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.521-522
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    • 2015
  • Many countries concern about environmental problems. Therefore, they have made regulation for mandatory reduction of greenhouse gases. Electric Vehicles(EVs) are one of the most effective counterproposals for it. EVs are usually charging for it by using actual distribution system of the Korea Electric Power Corporation(KEPCO). However, it could cause adverse effects such as increase of the power demand and voltage variation on the distribution system. To reduce adverse effects for demand power side, in this paper, charging for EVs by using PV(Photovolatic Power Generation) connected with ESS(Energy Storage System) are modeled by using Electro Magnetic Transient Program(EMTP). And then, the simulation results are compared with EVs that are connected to the distribution system of KEPCO for using charge.

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Analysis and improvement of transfer power capability considering movable load charging of EV (전기자동차 충전부하의 이동성을 고려한 전송 전력량의 해석 및 개선)

  • Kim, Deok Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.12
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    • pp.762-767
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    • 2017
  • This paper presents an analysis for improving the power transfer capability in transmission lines caused by the movable load charging of electric vehicles (EVs). EVs are expected to be used more widely and replace gas fuel vehicles in the near future due to the shortage of fossil fuels and for environmental preservation. Movable load charging of EVs could lead to the convergence of transferred power flow and overloading conditions in transmission lines in a specific area of a power system, which is conventionally based on estimated fixed load capability. To analyze these conditions, the New England Test System was divided into four regions based on the load characteristics, and different charging scenarios were considered. In these scenarios, the regional power load was highly increased to 31% based on the standard charging capacity of an EV. As a solution to the overloading problem of transmission lines, a TCSC was installed serially on the overloaded line to directly control the transferred power under limited line capability (100% load capability). The simulation showed that the application of a few TCSCs could efficiently and economically control the line capability problem caused by movable load charging of EVs.

Identifying Daily and Weekly Charging Profiles of Electric Vehicle Users in Korea : An Application of Sequence Analysis and Latent Class Cluster Analysis (전기차 이용자의 일단위 및 주단위 충전 프로파일 유형화 분석 : 순차패턴분석과 잠재계층분석을 중심으로)

  • Jae Hyun Lee;Seo Youn Yoon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.21 no.6
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    • pp.194-210
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    • 2022
  • The user-centered EV charging infrastructure construction policy the government is aiming for can increase convenience for electric vehicle users and bring new electric vehicle users into the market. This study was conducted to provide an in-depth understanding of the charging behaviors of actual electric vehicle users, which can be used as basic information for the electric vehicle charging infrastructure. Based on charging diary data collected for a week, the charging of electric vehicles was analyzed on a daily and weekly basis, and sequence analysis and latent class analysis were used. As a result, five daily charging profiles and four weekly charging profiles were identified, which are expected to contribute to revitalizing the electric vehicle market by providing key information for decision-making by potential electric vehicle users as well for establishing user-centered charging infrastructure policies in the future.

The Study for EV Charging Infrastructure connected with Microgrid (마이크로그리드와 연계된 전기자동차 충전인프라에 관한 연구)

  • Hun Shim
    • Journal of Internet of Things and Convergence
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    • v.10 no.1
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    • pp.1-6
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    • 2024
  • In order to increase the use of electric vehicles (EVs) and minimize grid strain, microgrid using renewable energy must take an important role. Microgrid may use fossil fuels such as small diesel power, but in many cases, they can be supplied with energy from renewable energy, which is an eco-friendly energy source. However, renewable energy such as solar and wind power have variable output characteristics. Therefore, in order to meet the charging and discharging energy demands of electric vehicles and at the same time supply load power stably, it is necessary to review the configuration of electric vehicle charging infrastructure that utilizes diesel power or electric vehicle-to-grid (V2G) as a parallel energy source in the microgrid. Against this background, this study modelized a microgrid that can stably supply power to loads using solar power, wind power, diesel power, and V2G. The proposed microgrid uses solar power and wind power generation as the primary supply energy source to respond to power demand, and determines the operation type of the load's electric vehicles and the rotation speed of the load synchronous machine to provide stable power from diesel power for insufficient generations. In order to verify the system performance of the proposed model, we studied the stable operation plan of the microgrid by simulating it with MATLAB /Simulink.