• 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).

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.189-190
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• 2015

This paper investigates an economic and highly efficient power converter topology and its modulation scheme for 60kW rapid EV charger system. The target system consists of three-phase three-switch buck-type rectifier topology. A new Carrier Based PWM scheme along with its simple implementation using logic gates is introduced in this paper. This PWM scheme replaces the diode rectifier equivalent switching state with an active switching state producing the effectively same current flowing path. As a result, the distortion of input current during the polarity reversal of capacitor line voltage can be mitigated. The proposed modulation technique is confirmed through simulation verification. The proposed modulation technique and its implementation scheme can expand the operation range of the three-phase three-switch buck-type rectifier having ac input and capacitor ripple current of high quality.

• 전력전자학회논문지
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• 제20권4호
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• pp.375-387
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• 2015

This study investigates an economic and highly efficient power-converter topology and its modulation scheme for 60 kW rapid EV charger system. The target system is a three-phase three-switch buck-type rectifier topology. A new carrier-based PWM scheme, which is characterized by simple implementation using logic gates, is introduced in this paper. This PWM scheme replaces the diode rectifier equivalent switching state with an active switching state to produce the same effective current flowing path. As a result, the distortion of input current during the polarity reversal of capacitor line voltage can be mitigated. The proposed modulation technique is confirmed through simulation verification. The proposed modulation technique and its implementation scheme can expand the operation range of the three-phase three-switch buck-type rectifier with high-quality AC input and capacitor ripple current.

• 한국통신학회논문지
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• 제35권9B호
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• pp.1381-1389
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• 2010

동적인 전력 공급을 통해 에너지 효율을 높여줄 것으로 기대되는 스마트 그리드 기술은 최근 전기자동차 기술의 발달과 함께 차량의 배터리를 가정용 축전지로 활용하는 Vehicle-to-Grid(V2G) 기술에 대한 관심으로 이어지고 있다. 한편, 무선으로 전력을 공급해주는 비접촉 충전 방식은 직접 사용자가 전기 플러그를 콘센트에 꽂지 않고도 자기장 유도 기반으로 전력을 공급해줌으로써 사용자의 안전과 편의성을 보장해 줄 수 있다. 더욱이 이러한 무선 충전과 동시에 자기장을 활용한 통신 시스템이 구축되면 스마트 그리드의 동적 전력 공급의 영역을 이동하는 전기자동차까지 확장함으로써 보다 실용적인 V2G 기술을 제공할 수 있다. 본 논문에서는 이를 위한 자기장 통신 시스템을 제안한다. 자기장 통신 시스템은 데이터 통신 기능과 위치 인식 기능을 제공하며 비접촉식 충전인프라를 그대로 활용할 수 있는 장점이 있기 때문에 V2G 활용에 있어서 핵심적인 기술이라고 할 수 있다. 제안하는 시스템의 데이터 통신을 전력 공급 관련 정보를 패킷화하여 송수신하고, 위치 인식을 통해 차량과 충전인프라의 위치에 따른 충전 효율 및 통신 성능을 향상시킨다. 또한 테스트 베드를 개발하여 다양한 환경에서 성능 검증을 수행하였다.

• 전기학회논문지
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• 제62권1호
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• pp.63-69
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• 2013

In recent years, technology for storing a preliminary power or a surplus of photovoltaic energy is required. This technique, as well as store a preliminary energy and improve the reliability of the gird safety. This system can plan a efficient power generation through the flexibility of the power supply from the perspective of not only provider but also user. Accordingly, the realization of the smart grid can be expected. This paper proposes a hybrid PCS using a photovoltaic and a lithium-polymer battery with the characteristics of high density energy. The main energy source of a hybrid PCS is a photovoltaic, grid and the auxiliary energy source is a lithium-polymer battery. The operation of a proposed system in this paper is verified with simulation and experimental results.