• Title, Summary, Keyword: EV(electrical vehicle)

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Optimal Coordination of Charging and Frequency Regulation for an Electric Vehicle Aggregator Using Least Square Monte-Carlo (LSMC) with Modeling of Electricity Price Uncertainty

  • Lee, Jong-Uk;Wi, Young-Min;Kim, Youngwook;Joo, Sung-Kwan
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1269-1275
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    • 2013
  • Recently, many studies have suggested that an electric vehicle (EV) is one of the means for increasing the reliability of power systems in new energy environments. EVs can make a contribution to improving reliability by providing frequency regulation in power systems in which the Vehicle-to-Grid (V2G) technology has been implemented and, if economically viable, can be helpful in increasing power system reliability. This paper presents a stochastic method for optimal coordination of charging and frequency regulation decisions for an EV aggregator using the Least Square Monte-Carlo (LSMC) with modeling of electricity price uncertainty. The LSMC can be used to assess the value of options based on electricity price uncertainty in order to simultaneously optimize the scheduling of EV charging and regulation service for the EV aggregator. The results of a numerical example show that the proposed method can significantly improve the expected profits of an EV aggregator.

Reliability Verification of Battery Disconnecting Unit (BDU 신뢰성 검증)

  • Yoon, Hye-Lim;Ryu, Haeng-Soo;Ji-Hong;Hong-Tae, Park
    • Proceedings of the KIEE Conference
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    • pp.866-867
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    • 2011
  • As part of the green growth, The Green Car has attracted wide attention. Types of the Green Car are Electric Vehicle, Plug-in Hybrid Electric Vehicle, Hybrid Electric Vehicle, Fuel Cell Vehicle and Clean Diesel Vehicle. Of these, The electric vehicle is equipped with the BDU(Battery Disconnecting Unit). BDU is supplying stable battery power and blocking it to protect electrical system of the electric vehicle. The BDU consists of electric components such as current sensor, fuse and pre-charge resistor. These must pass Voltage withstand test, Salt mist test, Thermal shock test, Vibration test and Short-circuit test commonly to verify reliability of the electric components. In addition, The current sensor should be verified whether normal operation. The breaking capacity of fuse should be verified. The durability of pre-charge resistor should be verified by supplying battery power and blocking it repeatedly. The reliability of BDU as well as the electric vehicle is secured by verifying the reliability of electric components. In addition, It will contribute to the acceleration and promotion of Green Car Technology.

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Analysis of Pulse Width Modulation Schemes for Electric Vehicle Power Converters (전기차용 전력변환장치의 펄스 폭 변조 기법 분석)

  • Quach, Ngoc-Thinh;Chae, Sang Heon;Kim, Eel-Hwan;Yang, Seung-Yong;Boo, Chang-Jin;Kim, Ho-Chan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2225-2231
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    • 2016
  • In order to overcome the problem of fossil fuel energy, electric vehicle (EV) has been used in recent years. The important issues of EV are driving distance and lifetime related to EV efficiency. A voltage source converter is one of the main components of EV which can be operated with various pulse width modulation (PWM) schemes such as continuous PWM schemes and discontinuous PWM schemes. These PWM schemes will cause the effects on the efficiency of converter system and the lifetime of EV. Therefore, this paper proposes an analysis of the PWM schemes for the power converter on the EV. The objective is to find out a best solution for the EV by comparing the total harmonic distortion (THD) and transient response between the various PWM schemes. The operation of traction motor on the EV with the PWM schemes will be verified by using Psim simulation program.

Electric Vehicle Charging Control System using a Smartphone Application Based on WiFi Communication (WiFi 기반 스마트폰 어플리케이션을 이용한 전기자동차 충전제어시스템)

  • Ro, Sunny;Lee, Kyung-Jung;Ki, Young-Hun;Ahn, Hyun-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.8
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    • pp.1138-1143
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    • 2013
  • In this paper, we propose a smartphone application based on a wireless fidelity(WiFi) in order to control the charging of electric vehicle(EV) and monitor the charging status together with the vehicle history information. The driver obtains much information on vehicle status through a smartphone application which communicates with the electric vehicle supply equipment(EVSE) management server while the EV also communicates with the EVSE for the authentification through controller area network(CAN). We also implement the simulator for the EV charging control system to verify the functions of the proposed application where the simulator consists of an EV model, an EVSE, and a smartphone. It is shown by the simulator that the proposed smartphone application allows the driver to control and to monitor the charging process of an EV conveniently and, moreover, it can provide the driver with vehicle information stored in the EVSE management server.

Study on Operating Guidelines of Electric Vehicles considering Negawatt Market (수요자원 거래시장을 고려한 전기차 운영기준에 관한 연구)

  • Yang, Ken-Mo;KIM, DONG-MIN
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.67-71
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    • 2015
  • The concept known as Vehicle-to-Grid (V2G) is to provide power to help balance loads by charging at night when demand is low and sending power to the grid when demand is high. Therefore, it is important to model the cost-benefit characteristics of Electric vehicle(EV)'s operation considering the negawatt market in real time. This paper proposes a methodology to formulate the various costs and economic benefits for sending the EV's power back to the grid, including a concept of inconvenience costs caused by operating the EV as a battery. This paper also introduces the general decision-making process based on the cost-benefit analysis in order to simulate the reasonable participation of V2G service. In the case study, it is confirmed by two-case simulations that the proposed approach is useful to help EV owners' decision-making. In the future, it is expected that the proposed methodology can be used as a decision-making guideline to help prepare the EV' power transmission.

Design of DC Solenoid Actuator applied in Electric Vehicle Relay (전기자동차 Relay 용 DC Solenoid actuator 설계)

  • Lee, Seo-Hyun;Yoon, Hee-Sung;Koh, Chang-Seop
    • Proceedings of the KIEE Conference
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    • pp.1029-1030
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    • 2011
  • 최근 녹색성장과 함께 전기자동차에 대한 관심이 높아짐에 따라 전기자동차 Relay 용 Solenoid Actuator에 대한 관심 또한 높아지고 있다. DC Solenoid Actuator는 Electric Vehicle relay(EV-Relay)의 동작을 담당하므로, EV-Relay의 핵심 부분이라 할 수 있다. 본 논문에서는 등가자기회로법을 통해 EV-Relay가 동작하기 위한 DC Solenoid Actuator를 설계하였다.

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Design Characteristics on Electric Drivetrain for Electric Vehicle Based on Driving Performance

  • Park, Ji-Seong;Jung, Sang-Yong
    • Journal of IKEEE
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    • v.13 no.3
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    • pp.47-54
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    • 2009
  • Design consideration on electric drivetrain(E-D/T), usually referred as electric motor for driving, its compatible reduction gear, and inverter, are performed for developing electric vehicle(EV) with efficient driving performance. Universal mode of driving cycle has been used to make up the actual vehicle performance, and its results are incorporated to the design of E-D/T.

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A Study of Durability Evaluation for Couplers in Battery Changeable Electric Vehicle (배터리 교환형 전기자동차의 배터리 접속기 내구성 평가에 관한 연구)

  • Kim, Kwang-Min;Yun, Jun-Bo;Kang, Byung-Guk;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.8
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    • pp.69-74
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    • 2014
  • Recently, many countries are researching and developing the various Electric Vehicle(EV) for reserving their natural environments and so on. But the charging time that is longer than the time of filling up the traditional engine vehicle will be the obstacles of spreading them. So, the other type EV is developed. It is the Battery Changeable EV. But there is not testing method for it. Especially, the defining of the durability evaluation for the couplers between battery and charger is very important because the couplers are changed very frequently. So, they may cause many faults and problems. Therefore, this study shows the definition of the durability procedure and the test is conducted with the equipment.

Analysis and Evaluation of Buck Converter with LC Input Filter for a PTC Heater in the Electric Vehicle (전기자동차용 PTC 히터 구동을 위한 입력 필터를 갖는 벅 컨버터의 특성 분석 및 성능 평가)

  • Jeon, Yong-Sung;Shin, Hye-Su;Chae, Beom-Seok;La, Jae-Du;Kim, Young-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.61 no.2
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    • pp.59-66
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    • 2012
  • Recently, the market of Electric Vehicle(EV) is increasing more and more than before. Thus a new heater for the EV is required. The PTC devices may be used the heater for the EV. In this paper, a simple DC-DC Converter is proposed as the PTC Heater for the EV. The proposed circuit was optimally desired to decrease the stress of the power devices and reduce the current ripples. To apply the result of the test in the laboratory to the actual EV system with the high DC voltage, ripple current, average current and output peak current are predicted by using the least-squares method. Finally, the proposed circuit is validated by various experiments.