• 한국전자통신학회논문지
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• 제16권2호
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• pp.255-260
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• 2021

최근 화석연료의 고갈로 인해 전기 자동차의 중요성이 점차 커지고 있다. 전기 자동차를 사용하기 위해서는 자동차에 내장된 배터리를 수시로 충전해야 한다. 전기 자동차는 소음, 진동에 있어 매우 뛰어난 성능을 구현한다. 하지만 배터리의 한계상 1회 충전 시 주행거리가 내연 자동차보다 상당이 짧으며, 배터리 충전 시간도 주유 시간에 비해 상대적으로 매우 오래 걸린다는 단점이 있다. 전기 자동차용 배터리를 충전하는 방식은 플러그인 방식과 무선 충전 방식이 있다. 본 논문에서는 전기 자동차용 무선 충전 기술에 대한 소개와 주요 국가의 기술 개발 현황 및 표준을 소개하였다.

• 대한교통학회지
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• 제35권3호
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• pp.210-219
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• 2017

친환경 교통수단으로 주목받고 있는 전기자동차는 우리나라에서도 2011년부터 지속적으로 보급대수가 증가하고 있다. 전기자동차 보급에 따라 충전 인프라 확대를 위하여 본 논문에서는 전기자동차 보급률이 높고 충전인프라가 비교적 잘 구축되어 있는 제주도 사례를 바탕으로 충전소 이용행태를 분석하여 기존 충전소의 효율적 운영방안과 추가적인 충전시설 설치 시 고려할 요소에 대하여 분석하고자 하였다. 전기자동차 충전소가 있는 읍면동별 급속충전기와 완속충전기 이용특성과 시설의 유형에 따라 시간대별 이용특성을 분석하였다. 제주도에 설치된 충전기의 이용 빈도를 분석한 결과, 급속충전기와 완속충전기 이용 빈도 모두 특정지역에 편중된 이용률이 나타났다. 유형별 충전소 이용은 급속충전기와 완속충전기 모두 업무시설과 공영주차장에 설치된 충전기 이용률이 높았으나, 시간대별 이용률을 보면 급속충전기는 오후시간 전반에 걸쳐 이용률이 높은 반면, 완속충전기 이용은 오전시간에 집중되어 있었다. 이러한 이용특성을 반영하여 이용자들이 전기자동차 충전소를 효율적으로 이용할 수 있도록 이용률이 낮은 충전소를 안내하는 홍보방안과 충전기를 이용할 때에 주의사항 및 충전완료 알림서비스 등을 제공하는 것이 필요할 것이다. 또한, 아직 충전기가 설치되지 않은 지역을 충전기 설치대상지역으로 고려하고, 이에 더불어 충전기 이용률이 높은 지역과 시설에 추가 설치가 이루어져야 한다. 실제 전기자동차 충전행태 분석 결과를 활용하여 실질적인 서비스 향상이 가능할 것으로 기대된다.

• KEPCO Journal on Electric Power and Energy
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• 제6권1호
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• pp.59-64
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• 2020

Scheduling of electric vehicles and optimizing for charging waiting time have been critical. Meanwhile, it is challengeable to exploit the fluctuating data from electric vehicles in real-time. We introduce an optimal routing algorithm and a simulator with electric vehicles obeying the Poisson distribution of the observed information about time, space and energy-demand. Electric vehicle routing is updated in every cycle even it is already set. Also, we suggest an electric vehicle routing algorithm for minimizing total trip time, considering a threshold of the waiting time. Total trip time and charging waiting time are decreased 34.3% and 86.4% respectively, compared to the previous algorithm. It can be applied to the information service of charging stations and utilized as a reservation service.

• 문화기술의 융합
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• 제7권1호
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• pp.551-557
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• 2021

전기자동차의 증가에 따라 공공장소의 전기자동차 충방전 기반시설 또한 급격히 늘어나고 있다. 전기자동차의 충방전을 위해서는 보안상의 취약점을 최소화하기 위해 전기자동차와 서비스 제공자가 서로의 신원을 확인하는 상호인증과정 후에 층방전 서비스를 시작하여야 한다. 본고에서는 해쉬함수와 메시지 인증코드를 사용하여 전기자동차와 충방전 서비스 제공자간의 양방향 인증 방법을 제안한다. 그리고 효율적인 충방전 시스템의 운영에 대해 기술한다. 제안된 시스템은 외부로 부터의 공격에 강한 내성을 가지며 충방전 서비스 이용자의 개인정보를 효과적으로 보호할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권8호
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• pp.2209-2221
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• 2023

As the supply of electric vehicles increases, research on wireless charging methods for convenience has been increasing. Because the electric vehicle wireless transmission device is installed on the ground and the electric vehicle battery is installed on the floor of the vehicle, the transmission and reception antennas are approximately 15-30 cm away, and thus strong magnetic fields are exposed during wireless charging. When a metallic foreign object is placed in the magnetic field area, an eddy current is induced to the metallic foreign object, and heat is generated, creating danger of fire and burns. Therefore, this study proposes a method to detect metallic foreign objects in the magnetic field area of a wireless electric vehicle charging system. An active detection-only coil array was used, and an LC resonance circuit was constructed for the frequency of the supply power signal. When a metallic foreign object is inserted into the charging zone, the characteristics of the resonance circuit are broken, and the magnitude and phase of the voltage signal at both ends of the capacitor are changed. It was confirmed that the proposed method has about 1.5 times more change than the method of comparing the voltage magnitude at one node.

• Journal of Electrical Engineering and Technology
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• 제12권5호
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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).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1175-1176
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• 2011

Electric Vehicle Supply Equipment(EVSE) is a system or an equipment to supply electric power for charging the traction batteries on the electric vehicle. EVSEs are classified with a conductive charging system and an inductive charging system by the power transfer method. Inductive charging systems are necessary to use high frequency converters to increase the output power and to reduce the size of the charging systems. In this paper, a 20kHz inverter for inductive charging system has been designed and PSCAD/EMTDC have been used to simulate the output characteristics of the 20kHz inverter.

• 자동차안전학회지
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• 제10권2호
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• pp.36-42
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• 2018

UNECE/WP29/GRPE/EVE has recently defined that the power of a hybrid electric vehicle is the system power. Although a method for measuring the maximum power of a hybrid electric vehicle is presented by KATRI, it does not consider charging and discharging characteristics of traction batteries. This study provides a maximum power measurement method which reflects the charging and discharging characteristics of traction batteries in NOVC-HEVs (Not Off Vehicle Charging-Hybrid Electric Vehicles). Both methods are compared with regard to the output measurement results.

• Journal of Electrical Engineering and Technology
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• 제7권5호
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• pp.736-744
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• 2012

In this paper, a battery charging system for Plug-in Hybrid Electric Vehicle (PHEV) and Electric Vehicle (EV), and operation algorithm of charging system are introduced. Also, the proposed charging system uses commercial electricity in order to charge the battery of parked PHEV and 48V battery charging system with power factor controllable single phase converter for PHEV is investigated in this paper. This research verifies the power factor control of input and the converter output controlled by the charge control algorithm through simulation and experiment.

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.742-751
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• 2018

Electric vehicles (EV) are emerging as the future transportation vehicle reflecting their potential safe environmental advantages. Vehicle to Grid (V2G) system describes the hybrid system in which the EV can communicate with the utility grid and the energy flows with insignificant effect between the utility grid and the EV. The paper presents an optimal power control and energy management strategy for Plug-In Electric Vehicle (PEV) charging stations using Wind-PV-FC-Battery renewable energy sources. The energy management optimization is structured and solved using Multi-Objective Particle Swarm Optimization (MOPSO) to determine and distribute at each time step the charging power among all accessible vehicles. The Model-Based Predictive (MPC) control strategy is used to plan PEV charging energy to increase the utilization of the wind, the FC and solar energy, decrease power taken from the power grid, and fulfil the charging power requirement of all vehicles. Desired features for EV battery chargers such as the near unity power factor with negligible harmonics for the ac source, well-regulated charging current for the battery, maximum output power, high efficiency, and high reliability are fully confirmed by the proposed solution.