• Title, Summary, Keyword: charging system

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Impact of Electric Vehicle Penetration-Based Charging Demand on Load Profile

  • Park, Woo-Jae;Song, Kyung-Bin;Park, Jung-Wook
    • Journal of Electrical Engineering and Technology
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    • v.8 no.2
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    • pp.244-251
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    • 2013
  • This paper presents a study the change of the load profile on the power system by the charging impact of electric vehicles (EVs) in 2020. The impact of charging EVs on the load demand is determined not only by the number of EVs in usage pattern, but also by the number of EVs being charged at once. The charging load is determined on an hourly basis using the number of the EVs based on different scenarios considering battery size, model, the use of vehicles, charging at home or work, and the method of charging, which is either fast or slow. Focusing on the impact of future load profile in Korea with EVs reaching up 10 and 20 percentage, increased power demand by EVs charging is analyzed. Also, this paper analyzes the impact of a time-of-use (TOU) tariff system on the charging of EVs in Korea. The results demonstrate how the penetration of EVs increases the load profile and decreases charging demand by TOU tariff system on the future power system.

Test and simulation of High-Tc superconducting power charging system for solar energy application

  • Jeon, Haeryong;Park, Young Gun;Lee, Jeyull;Yoon, Yong Soo;Chung, Yoon Do;Ko, Tae Kuk
    • Progress in Superconductivity and Cryogenics
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    • v.17 no.3
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    • pp.18-22
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    • 2015
  • This paper deals with high-Tc superconducting (HTS) power charging system with GdBCO magnet, photo-voltaic (PV) controller, and solar panels to charge solar energy. When combining the HTS magnet and the solar energy charging system, additional power source is not required therefore it is possible to obtain high power efficiency. Since there is no resistance in superconducting magnet carrying DC transport current the energy losses caused by joule heating can be reduced. In this paper, the charging characteristics of HTS power charging system was simulated by using PSIM. The charging current of HTS superconducting power charging system is measured and compared with the simulation results. Using the simulation of HTS power charging system, it can be applied to the solar energy applications.

Analysis for Evaluating the Impact of PEVs on New-Town Distribution System in Korea

  • Choi, Sang-Bong
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.859-864
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    • 2015
  • This paper analyzes the impact of Plug-in Electric vehicles(PEVs) on power demand and voltage change when PEVs are connected to the domestic distribution system. Specifically, it assesses PEVs charging load by charging method in accordance with PEVs penetration scenarios, its percentage of total load, and voltage range under load conditions. Concretely, we develop EMTDC modelling to perform a voltage distribution analysis when the PEVs charging system by their charging scenario was connected to the distribution system under the load condition. Furthermore we present evaluation algorithm to determine whether it is possible to adjust it such that it is in the allowed range by applying ULTC when the voltage change rate by PEVs charging scenario exceed its allowed range. Also, detailed analysis of the impact of PEVs on power distribution system was carried out by calculating existing electric power load and additional PEVs charge load by each scenario on new-town in Korea to estimate total load increases, and also by interpreting the subsequent voltage range for system circuits and demonstrating conditions for countermeasures. It was concluded that total loads including PEVs charging load on new-town distribution system in Korea by PEVs penetration scenario increase significantly, and the voltage range when considering ULTC, is allowable in terms of voltage tolerance range up to a PEVs penetration of 20% by scenario. Finally, we propose the charging capacity of PEVs that can delay the reinforcement of power distribution system while satisfying the permitted voltage change rate conditions when PEVs charging load is connected to the power distribution system by their charging penetration scenario.

Rapid Electric Vehicle Charging System with Enhanced V2G Performance

  • Kang, Taewon;Kim, Changwoo;Suh, Yongsug;Park, Hyeoncheol;Kang, Byungik;Kim, Simon
    • Proceedings of the KIPE Conference
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    • pp.201-202
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    • 2012
  • This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charging mode, constant-current mode, and constant-voltage mode. Each mode is operated according to battery states: voltage, current and State of Charging (SOC). The proposed system is able to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 67A. The optimal discharging algorithm for Vehicle to the Grid (V2G) operation has been adopted to maintain the discharging current of 1C. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system. Experiment waveforms confirm the proposed functionality of the charging system.

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Reduction of Control Signal Overhead for Electric Vehicle Charging Operation in Smart Grid System

  • Kwon, Ojin;Kim, Pilkee;Yoon, Yong-Jin
    • International Journal of Precision Engineering and Manufacturing-Green Technology
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    • v.4 no.2
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    • pp.191-197
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    • 2017
  • Smart grid systems have been proposed to replace the conventional power distribution system in order to accommodate future market penetration of electric vehicles (EVs). Nevertheless, there are many factors to consider when large numbers of EVs require simultaneous charging in the smart grid. Among various optimization schemes, the most updated schemes proposed charging with coordination to optimize EV charging performance. In this case, huge amount of control signals are involved in the coordinated charging, therefore the charging performance is retarded. In this paper, a new threshold-based charging operation with historical average data of the EV charging system to improve the EV charging performance is proposed by minimizing control signal overhead, instead of maximum power delivery to all EVs. The moving average of historical data for BSOC levels of the EVs can properly approximate the charging profile of the EVs over time thus enabling the development of an optimization algorithm based on the threshold method. Up to 33% of the reduction in the control signal overhead is achieved with slight trade off in the power delivery to the EVs.

PEBB Based Bi-directional Rapid Charging System for EV Traction Battery

  • Kang, Taewon;Chae, Beomseok;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • pp.323-324
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    • 2013
  • This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is specified to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.

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Evaluation of the Charging effects of Plug-in Electrical Vehicles on Power Systems, taking Into account Optimal Charging Scenarios (전기자동차의 충전부하 모델링 및 충전 시나리오에 따른 전력계통 평가)

  • Moon, Sang-Keun;Gwak, Hyeong-Geun;Kim, Jin-O
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.6
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    • pp.783-790
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    • 2012
  • Electric Vehicles(EVs) and Plug-in Hybrid Electric Vehicles(PHEVs) which have the grid connection capability, represent an important power system issue of charging demands. Analyzing impacts EVs charging demands of the power system such as increased peak demands, developed by means of modeling a stochastic distribution of charging and a demand dispatch calculation. Optimization processes proposed to determine optimal demand distribution portions so that charging costs and demand can possibly be managed. In order to solve the problems due to increasing charging demand at the peak time, alternative electricity rate such as Time-of-Use(TOU) rate has been in effect since last year. The TOU rate would in practice change the tendencies of charging time at the peak time. Nevertheless, since it focus only minimizing costs of charging from owners of the EVs, loads would be concentrated at times which have a lowest charging rate and would form a new peak load. The purpose of this paper is that to suggest a scenario of load leveling for a power system operator side. In case study results, the vehicles as regular load with time constraints, battery charging patterns and changed daily demand in the charging areas are investigated and optimization results are analyzed regarding cost and operation aspects by determining optimal demand distribution portions.

A Study of Comparing and Analyzing Electric Vehicle Battery Charging System and Replaceable Battery System by Considering Economic Analysis (경제성을 고려한 전기자동차 충전시스템과 배터리 교체형 시스템의 비교분석 연구)

  • Kim, Si-Yeon;Hwang, Jae-Dong;Lim, Jong-Hun;Song, Kyung-Bin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.9
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    • pp.1242-1248
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    • 2012
  • Electric vehicle usage is currently very low, but it will be increase with development of electric vehicle technology and a good government policy. Moreover in 2020, advanced electric vehicle manufacturing system will give high performance for its price and mass production. Electric vehicle will become widespread in Korea. From an operational and a planned viewpoint, the electric power demand should be considered in relation to diffusion of electric vehicles. This paper presents the impact of the various battery charge systems. A comparison is performed for electric vehicle charging methods such as, normal charging, fast charging, and battery swapping. In addition, economic evaluation for the replaceable battery system and the quick battery charging system is performed through basic information about charging Infrastructure installation cost. The results of the evaluation show that replaceable battery system is more economical and reliable in side of electric power demand than quick battery charging system.

A Design and Control of Bi-directional Non-isolated DC-DC Converter with Coupled Inductors for Rapid Electric Vehicle Charging System

  • Kang, Taewon;Kim, Changwoo;Suh, Yongsug;Park, Hyeoncheol;Kang, Byungil;Kim, Daegyun
    • Proceedings of the KIPE Conference
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    • pp.429-430
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    • 2011
  • This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology with coupled inductors. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charging mode, constant-current mode, and constant-voltage mode. The pre-charging mode employs the staircase shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is able to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 67A. The optimal discharging algorithm for Vehicle to the Grid (V2G) operation has been adopted to maintain the discharging current of 1C. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.

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AC Regeneratable Battery Charging and Discharging Test System (AC 회생이 가능한 배터리 충·방전 테스트 시스템)

  • Kim, Jun-Gu;Youn, Sun-Jae;Kim, Jae-Hyung;Won, Chung-Yuen;Na, Jong-Kuk
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.2
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    • pp.99-106
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    • 2012
  • In this paper, 15[kW] AC regenerative system for battery charging and discharging test is proposed. The regenerative system is able to regenerate surplus energy to the grid in discharging mode, and the inverter of the system can be operated as a converter to compensate scarce energy in charging mode. In case of the conventional DC charging and discharging system, the regenerative energy is consumed by a resistor. However, as the proposed system regenerates the surplus energy to the grid through using DC-AC inverter, the energy saving effect can be achieved. In this paper, 15[kW] battery charging and discharging system is developed, and the validity of the system is verified through simulation and experimental results.