• Title, Summary, Keyword: charging system

Search Result 998, Processing Time 0.047 seconds

Electric Yard Tractor with Furtive Charging (Furtive 충전을 활용한 전기식 Yard tractor)

  • Lee, Dong-Su;Lim, Dong-Nam;Jeon, Seong-Jeub;Ko, Young Suk
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.482-483
    • /
    • 2014
  • In this paper, an electric yard tractor (YT) with furtive charging system is investigated. YT is one of pollution sources in container terminals. The furtive charging system does not impose difficulties on YT day-schedule because charging is performed when a YT is waiting under RTGC (Rubber Type Gantry crane) or Quay-wall crane.

  • PDF

Study on the Smart Charging for Plug-in Hybrid Electric Vehicle (플러그인 하이브리드 전기자동차의 스마트 충전에 관한 연구)

  • Roh, Chul-Woo;Kim, Min-Soo
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.349-352
    • /
    • 2008
  • The most concerning issue in these days is the energy crisis by increasing threat of global warming and depletion of natural resources. In the situations, the Plug-in Hybrid Electric Vehicle (PHEV) is drawing attention from many countries for the next generation's car which has higher fuel efficiency and lower environmental impact. This paper presents simulation results about the limit capacity of central power-grid which doesn't have enough surplus electric power for charging PHEVs. Therefore, this paper also presents a smart charging system that can charge the PHEVs with a function of distributing demands of charging. The smart charging system is an agent facility between the government and consumer, which can recommend the best time to charge the battery of PHEVs by the lowest energy cost. This function of choosing time-slots is the technical system for the government which wants to control the consumption rate of electric power for PHEVs. Finally, this paper presents the economic feasibility of PHEVs from the two kinds of price system, midnight electric price and home electric price.

  • PDF

PFC and Zero Torque Control of SRM for EV Battery Charging (EV용 충전 인덕터용 PFC 및 제로 토크제어)

  • Rashidi, A.;Namazi, M.M.;Saghaian-nezhad, S.M.;Lee, D.H.;Ahn, J.W
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.652-654
    • /
    • 2015
  • Integrated switched reluctance motor drive as an electric vehicle battery charger is presented in this paper. The SRM, which is used as the traction power in the driving mode, is used in the charge circuit to improve the power factor of charging system. The charging circuit can share the power switches of the asymmetric converter and phase windings of SRM to charge the battery, and can reduce the size and cost of the system in the plug-in system. To keep the rotor at standstill, zero torque control method is proposed. Since the inductances of the SRM windings are not same at any stop position, the charger controller controls the reference current to satisfy the total charging current with PFC and zero torque condition. A novel cubic equation method is proposed as a current reference distributor of the charging controller. Simulations are performed by MATLAB software and results satisfy the Effectiveness of proposed battery charging system.

  • PDF

Optimal Scheduling of Electric Vehicles Charging in low-Voltage Distribution Systems

  • Xu, Shaolun;Zhang, Liang;Yan, Zheng;Feng, Donghan;Wang, Gang;Zhao, Xiaobo
    • Journal of Electrical Engineering and Technology
    • /
    • v.11 no.4
    • /
    • pp.810-819
    • /
    • 2016
  • Uncoordinated charging of large-scale electric vehicles (EVs) will have a negative impact on the secure and economic operation of the power system, especially at the distribution level. Given that the charging load of EVs can be controlled to some extent, research on the optimal charging control of EVs has been extensively carried out. In this paper, two possible smart charging scenarios in China are studied: centralized optimal charging operated by an aggregator and decentralized optimal charging managed by individual users. Under the assumption that the aggregators and individual users only concern the economic benefits, new load peaks will arise under time of use (TOU) pricing which is extensively employed in China. To solve this problem, a simple incentive mechanism is proposed for centralized optimal charging while a rolling-update pricing scheme is devised for decentralized optimal charging. The original optimal charging models are modified to account for the developed schemes. Simulated tests corroborate the efficacy of optimal scheduling for charging EVs in various scenarios.

Effect of Hydrogen Charging on the Mechanical Properties of 304 Stainless Steels

  • Lee, Sang-Pill;Hwang, Seung-Kuk;Lee, Jin-Kyung;Son, In-Soo;Bae, Dong-Su
    • Journal of the Korea Society For Power System Engineering
    • /
    • v.19 no.5
    • /
    • pp.73-79
    • /
    • 2015
  • The effects of hydrogen charging on the mechanical properties of 304 stainless steels were investigated in conjunction with the detailed examinations of their fracture modes. The dependence of the absorbed impact energy and the surface hardness of the 304 stainless steels on the hydrogen charging time was characterized. The tensile properties of the 304 stainless steels by the variation of cross-head speed were also evaluated at the room temperature. The hydrogen charging was performed by an electrolysis method for all specimens of the 304 stainless steels. The mechanical properties of the 304 stainless steels exhibited the sensitivity of embrittlement due to a hydrogen charging. The correlation between mechanical properties and fracture surfaces was discussed.

Development of 20kV Pulse Power Charging System (20kV급 Capacitor Charging Power System 개발)

  • Jeong, I.W.;Rim, G.H.;Choi, Y.W.;Lee, H.S.;Kim, J.S.;Ryoo, H.J.;Gusev, G.I.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.213-214
    • /
    • 2001
  • This paper describes a power supply for a rapid pulse power charging system designed for charging a $0.35{\mu}F$ capacitor to 20kV in approximately 3ms. The power supply should be capable of recharging the load capacitor maximum 300 times within one second. This power supply is based on a series resonant 3-phase inverter followed by the step-up transformers. The experiments have been carried out at different repetition rates and charging voltages.

  • PDF

Design of In-Wheel Type Switched Reluctance Motor for Electric Vehicle Traction and Wireless Charging (전기자동차 트랙션 및 무선 충전용 인휠타입 스위치드 릴럭턴스 전동기 설계)

  • Lukman, Grace Firsta;Son, Dong-Ho;Lee, Dong-Hee;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.12
    • /
    • pp.1866-1872
    • /
    • 2017
  • This paper presents the design of in-wheel type Switched Reluctance Motor (SRM) which can be used as both traction motor and power pickup device in a wireless charging system of electric vehicles. The SRM acts as a traction drive in driving mode and a power receiver in charging mode to avoid any additional weights. Double stator axial field SRM is used due to its structure that can be mounted inside the wheel. The charging circuit is integrated with the asymmetric converter and phase windings of SRM, reducing the cost and size of the system. Magnetic resonance is implemented to increase the efficiency. Simulations done in Maxwell and Simplorer verify the effectiveness of the proposed system.

An Analysis of Track Access Charging Systems of European Countries and Recommendation of Policy Directions for Domestic Track Access Charging System (유럽의 선로사용료체계 분석과 국내 선로사용료체계 구축방향)

  • Mun Jin-Su
    • Journal of the Korean Society for Railway
    • /
    • v.8 no.3
    • /
    • pp.235-243
    • /
    • 2005
  • Following the rail reform in 2004, rail industry in Korea has separated into two parts: one is the infrastructure manager and the other is train operator. Amongst many aspects, track access charging system is one of the imminent aspects to be studied closely to make the rail reform successful. In this study, track access charging systems of European countries are closely investigated and compared one another and lessons learnt from their experiences are derived. Finally, policy directions regarding the track access charging system to be adopted in Korea are suggested.

New Prediction of the Number of Charging Electric Vehicles Using Transformation Matrix and Monte-Carlo Method

  • Go, Hyo-Sang;Ryu, Joon-Hyoung;Kim, Jae-won;Kim, Gil-Dong;Kim, Chul-Hwan
    • Journal of Electrical Engineering and Technology
    • /
    • v.12 no.1
    • /
    • pp.451-458
    • /
    • 2017
  • An Electric Vehicle (EV) is operated with the electric energy of a battery in place of conventional fossil fuels. Thus, a suitable charging infrastructure must be provided to expand the use of electric vehicles. Because the battery of an EV must be charged to operate the EV, expanding the number of EVs will have a significant influence on the power supply and demand. Therefore, to maintain the balance of power supply and demand, it is important to be able to predict the numbers of charging EVs and monitor the events that occur in the distribution system. In this paper, we predict the hourly charging rate of electric vehicles using transformation matrix, which can describe all behaviors such as resting, charging, and driving of the EVs. Simulation with transformation matrix in a specific region provides statistical results using the Monte-Carlo Method.

Charging Schedule Establishment of PEVs considering Power System Constraints (전력계통 제약을 고려한 플러그인 전기자동차 충전계획 수립)

  • Gwon, Han Na;Kook, Kyung Soo
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.19 no.5
    • /
    • pp.632-639
    • /
    • 2018
  • Recently, a policy has been enforced to supply Plug-in Electric Vehicles (PEVs) but this may require reinforcement of the power system depending on its clustering because PEVs are charged directly from power systems. On the other hand, as the reinforcement of power system is limited by time and budget, it is important to supply the charging demand of PEVs efficiently using the existing power systems to increase the diffusion of PEVs. This paper establishes a charging schedule for Plug-in Electric Vehicles (PEVs) considering the power system constraints. For this, the required amount and time of the charging demand for an individual PEV was modeled to integrate into power systems based on the driving pattern and charging tariff of PEV. Furthermore, the charging schedule of PEVs was established to meet the power system constraints by calculating the operating conditions of the power systems with PEVs.