• 전력전자학회논문지
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• 제27권6호
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• pp.455-463
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• 2022

This study proposes a receiving pad identification coil for wireless charging of electric vehicles. The proposed coil identifies the shape of the receiving pad through magnetic coupling with the receiving pad. Therefore, the shape of the coil is designed to show the different magnetic properties of each receiving pad. The accuracy of this design is verified through finite element method simulation. Furthermore, the operation method of the secondary pad identification circuit is described, and the appropriate magnitude and length of the pulse voltage applied to this circuit for receiving pad identification are derived through simulation. The performance of the proposed identification coil set is verified by the experimental results.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2019년도 추계학술대회
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• pp.94-95
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• 2019

본 논문에서는 에너지인터넷의 한 분야인 전력선 통신 기반 전기 자동차 충전 시스템 구축에서 발생하는 임펄스 노이즈 동기화 문제를 해결하기 위해 OFDM에서 사용하는 프레임 동기화 방식을 제안한다. Kasami sequence를 통한 동기화 방식으로 전력선 통신의 임펄스 노이즈 동기화 결과를 확인한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.495-496
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• 2018

본 논문은 최근 전기자동차용 충전시스템에 대한 연구개발 동향과 전망을 제시한다. 해당 기술분야의 논문 및 최근 특허출원 자료 등을 기초로 최근 국외 선진업체 및 국내 산업체 대학 연구소들의 기술개발 동향 및 기술권리화 전략을 비교 분석하였고, 이를 기초로 향후 전망 및 대책을 제시한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2020년도 전력전자학술대회
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• pp.361-362
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• 2020

내연기관을 이용한 이동 수단의 환경 오염에 미치는 영향이 부각 되면서, 전기 자전거 및 전기 보드와 같이 소형 전기 자동차로 분류되는 E-Mobility에 대한 관심이 증대되고 있다. 하지만, 대중화되어 있는 EV 충전소와 달리, E-Mobile 충전 시스템은 공급이 부족한 실정이다. 따라서, 본 논문에서는 다양한 사양의 충전전압 요건을 충족하는 충전 시스템을 제안한다. 높은 범용성을 갖추기 위해 멀티 레벨 충전 시스템을 설계한다. 또한, 제안하는 충전 시스템의 PSIM 시뮬레이션 및 프로토타입을 제작하여 타당성을 검증한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 춘계학술발표대회
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• pp.282-283
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• 2023

본 논문에서는 공개 데이터 사이트의 OpenAPI를 통해 지속적으로 축적되고 있는 제주지역 전기자동차 충전 트랜잭션을 활용하여 시간대별 충전수요의 패턴을 분석한다. 시간대별 수요, 충전시간 등과 아울러 요일과 지역에 따른 시간대별 충전 패턴의 분석은 전기자동차 충전에 있어서 신재생 에너지의 결합을 요일과 지역 맞춤형으로 설계할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권10호
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• pp.4988-5012
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• 2019

As a subset of the Internet of Things, the Internet of Energy (IoE) is expected to tackle the problems faced by the current smart grid framework. Notably, the conventional day-ahead power scheduling of the smart grid should be redesigned in the IoE architecture to take into consideration the intermittence of scattered renewable generations, large amounts of power consumption data, and the uncertainty of the arrival time of electric vehicles (EVs). Accordingly, a day-ahead power scheduling system for the future IoE is proposed in this research to maximize the usage of distributed renewables and reduce carbon emission caused by the traditional power generation. Meanwhile, flexible charging mechanism of EVs is employed to provide preferred charging options for moving EVs and flatten the load profile simultaneously. The simulation results revealed that the proposed power scheduling mechanism not only achieves emission reduction and balances power load and supply effectively, but also fits each individual EV user's preference.

• 한국태양에너지학회 논문집
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• 제40권4호
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• pp.35-44
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• 2020

Currently, various policies regarding ecofriendly vehicles are being proposed to reduce carbon emissions. In this study, the required areas for charging electric vehicle (EV) batteries using electricity produced by photovoltaic (PV) power plants were estimated. First, approximately 2.4 million battery EVs, which represented 10% of the total number of vehicles, consume approximately 404 GWh. Second, the power required for charging batteries is approximately 0.3 GW, and the site area of the PV power plant is 4.62 ㎢, which accounts for 0.005% of the national territory. Third, from the available sites of buildings based on the region, Jeju alone consumes approximately 0.2%, while the rest of the region requires approximately 0.1%. Fourth, Seoul, which has the smallest available area of mountains and farmlands, utilizes 0.34% of the site for PV power plants, while the other parts of the region use less than 0.1%. The results of this study confirmed that the area of the PV power plant site for producing battery-charging power generated through the supply of EVs is very small. Therefore, it is desirable to analyze and implement more specific plans, such as efficient land use, forest damage minimization, and safe maintenance, to expand renewable energy, including PV power.

• 한국IT서비스학회지
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• 제21권6호
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• pp.117-125
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• 2022

In respond to climate change caused by global environmental problems, countries around the world are actively promoting the advancement of new electricity industries. The new energy business is being applied to energy storage systems (ESS), electric vehicle charging business, and power demand response using cutting edge technologies. In 2022, the Korean government is also establishing a policy stance to foster new energy industries and making efforts to improve its responsiveness to power demand response with the innovative technologies. In Korea, attempts to commercialize energy power are also being made in the private and public sectors to control energy power in houses, buildings, and industries. For example, private companies, local governments, and central government are making all-out efforts to develop new energy industry models through joint investment. There are forms such as establishing energy-independent facilities by region, establishing an electric vehicle charging system, controlling urban lighting systems with Information technologies, and managing demand between power suppliers and power consumers. This study examined the business model applied with energy storage system, electric vehicle charging business, smart lighting, and power demand response based on information communication technology to examine the site where smart energy system was introduced. According to this study, company missions and government tasks are suggested to apply new energy business technologies as economical energy solutions that meet the purpose of use by region, industry, and company.

• 한국ITS학회 논문지
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• 제23권2호
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• pp.142-156
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• 2024

교통부문 탄소중립을 위한 전기자동차로의 전환에 있어 충분한 충전 인프라의 구축은 중요한 선행요소이다. 특히, 거주지의 충전 인프라 구축은 필수적이다. 우리나라의 주거형태는 주로 공동주택이며, 다수의 거주민을 위한 공공 충전기가 공급되어야 한다. 정부는 충전시설과 전기자동차 전용주차구역의 확보를 법적으로 규정하고 있으나, 주차면수만을 산출근거로 한다. 완속 충전기는 3.5kW 과금형 콘센트와 7kW 완속 충전기가 주를 이룬다. 전자가 충전기 설치 및 이용에 유리하지만, 충전속도가 느려 두 가지 형태의 충전기는 양립이 필요하다. 본 연구에서는 일일 주행거리를 기반으로 산정한 전기자동차의 충전 수요에 대응할 수 있는 충전기를 할당하는 최적화 모형을 제시하였다. 또한, 메타 휴리스틱 알고리즘인 Tabu Search를 사용하여 최적화 모형을 만족하는 것과 동시에 충전기 공급 및 충전 비용을 최소화할 수 있는 완속 충전기 공급량을 산정하였다. 사례 분석을 위해 개인통행실태조사자료를 사용해 주행거리를 산정하였으며, 가상의 충전 시나리오 및 환경을 설정하여 100대의 전기자동차 충전 수요에 대응하는 22대의 3.5kW 과금형 콘센트를 최적 공급량으로 산정하였다.

• 전기학회논문지
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• 제66권2호
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• pp.328-338
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• 2017

In this paper, a zero torque control scheme adopting current sharing function (CSF) used in integrated Switched Reluctance Motor (SRM) drive with DC battery charger is proposed. The proposed control scheme is able to achieve the keeping position (KP), zero torque (ZT) and power factor correction (PFC) at the same time with a simple novel current sharing function algorithm. The proposed CSF makes the proper reference for each phase windings of SRM to satisfy the total charging current of the battery with zero torque output to hold still position with power factor correction, and the copper loss minimization during of battery charging is also achieved during this process. Based on these, CSFs can be used without any recalculation of the optimal current at every sampling time. In this proposed integrated battery charger system, the cost effective, volume and weight reduction and power enlargement is realized by function multiplexing of the motor winding and asymmetric SR converter. By using the phase winding as large inductors for charging process, and taking the asymmetric SR converter as an interleaved converter with boost mode operation, the EV can be charged effectively and successfully with minimum integral system. In this integral system, there is a position sliding mode controller used to overcome any uncertainty such as mutual inductance or DC offset current sensor. Power factor correction and voltage adaption are obtained with three-phase buck type converter (or current source rectifier) that is cascaded with conventional SRM, one for wide input and output voltage range. The practicability is validated by the simulation and experimental results by using a laboratory 3-hp SRM setup based on TI TMS320F28335 platform.