• Title/Summary/Keyword: Power Conversion System

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Power Conversion System for Electric Power Take-off of Agricultural Electric Vehicle (농업용 전기차량의 전기식 동력인출장치용 전력변환시스템)

  • Kwak, Bongwoo;Kim, Jonghoon
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.994-1002
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    • 2019
  • In this paper, we propose the development of a power conversion system for electric power take-off (e-PTO) of agricultural electric vehicles. Most e-PTOs use commercial power $220V_{AC}$. A bidirectional power conversion system having a two-stage structure consisting of a DC-DC converter and a DC-AC inverter for supplying a high output voltage using a low battery voltage of an agricultural electric vehicle is suitable. we propose a power conversion system consisting of the one-stage dual active bridge (DAB) converter and the two-stage bidirectional full bridge inverter. In addition, we propose a soft start algorithm for reducing the inrush current generated by the link capacitor charging during the initial operation. A 3kW prototype system and its corresponding algorithms have been implemented to verify its effectiveness through experiments.

A simple 3-phase inverter topology to improve power conversion efficiency

  • Phan, Dang-Minh;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
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    • 2014.11a
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    • pp.25-26
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    • 2014
  • Renewable energy sources such as wind and solar power are free and can be easily harvested everywhere. However, one of the biggest problems when using this kind of energy source is how to increase the efficiency of power conversion system. This paper introduces a modified 3-phase inverter in order to increase the power conversion efficiency. By adding 3 bi-directional switches at output of the inverter, the current flow back DC source during zero state is prevented to minimize leakage current, so that the efficiency of whole system is increased. The proposed topology also improves the power quality to satisfy the total harmonics distortion (THD) requirement. In order to verify the effectiveness of the proposed topology, simulation results are carried out using Simulink in MATLAB.

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Design of the Power Conversion System for the Magnetic Levitation System (자기부상열차용 전원공급장치 설계)

  • Song, Byeong-Mun;Kye, Moon-Ho;Oh, Sung-Chul;Joe, Ki-Youn;Kim, Yo-Hee
    • Proceedings of the KIEE Conference
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    • 1990.11a
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    • pp.384-387
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    • 1990
  • This paper describes the design of the power conversion system for the 3-ton prototype magnetic levitation system. Electric power needed for the propulsion and levitation system of the vehicle is supplied by the wayside rectifier through the power rail and is picked up by the on board power collector, and is supplied to the propulsion VVVF inverter and levitation chopper. In this paper, design characteristic of the VVVF inverter, chopper and power source unit which provides control power to the levitation controller and levitation power to the chopper is described.

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Pulsed-Power System for Leachate Treatment Applications

  • Jang, Sung-Roc;Ryoo, Hong-Je;Ok, Seung-Bok
    • Journal of Power Electronics
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    • v.11 no.4
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    • pp.612-619
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    • 2011
  • This paper presents a water treatment system for leachate from sewage-filled ground that uses a pulsed-power modulator developed based on semiconductor switches in order to realize a long life, a high repetition rate, and a fast rising time. The specifications of the developed pulsed-power modulator are the pulsed output voltage, the output current, the pulse repetition rate (PRR), the pulse width, and an average output power of $60\;kV_{max}$, $300\;A_{max}$, 3000, $50\;{\mu}s$, and 15 kW, respectively. The pulsed-power water treatment system was introduced and analyzed using an equivalent electrical circuit model to optimize the output voltage waveform. The experimental results verify that the proposed water treatment system can be effectively used for industrial applications.

Development of TIG-Welder DC-DC Converter Based on Fuel Cell Stack (연료전지로 구동되는 TIG-용접기용 DC-DC 컨버터 개발)

  • Min, Myung-Sik;Park, Sang-Hoon;Jeon, Byum-Soo;Won, Chung-Yun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.8
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    • pp.48-56
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    • 2009
  • This paper presents the power conversion system for TIG-welder using the fuel cell stack Generally, power supply for TIG-welder uses the front-ended diode bridge rectifier by common AC power source. In this case, power supply of TIG-welder increases in volume because of using bulky capacitor and diode-rectifier. Also, input current includes ripple and harmonics. Moreover, TIG-welder will be demand the power supply with lightweight and easy movement in the areas like as the islands and mountainous areas or the special environment are not use common AC power source. Thus, input power of the power conversion system for TIG-welder is used PEMFC(Polymer Electrolyte Membrane Fuel Cell), and the power conversion system is comprised of full-bridge converter with function of boost converter and inverter welding source, in this paper. The proposed power conversion system which is power supply for TIG-welder was verified by computer simulations and experiments.

Power conversion control for zero emission buildings (탄소제로 빌딩을 위한 전력변환 제어)

  • Han, Seok-Woo
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.504-505
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    • 2011
  • Decreasing actual greenhouse gas will be difficult if it is not solved addressed in architectural fields. Zero emission building or zero energy building, maximize the efficiency of energy, which means the building can operate by their own renewable energy facility without any other supplying. To be a zero emission building, a building needs realization of high efficiency low energy consumption, construction of building its own energy production facilities and lastly a power grid connection. According to increasing of DC load about TV, LED lighting, computer, IT in building for living and business, it is expected the save of energy when the system of AC power distribution change into the system of DC power distribution. Renewable energy exists a big different rate produced by outside environment. When electrical power overproduce, it can supply for system. Otherwise, if electrical power produce less, it can receive supply from system. Send and receive power can lead to zero to annual standard. This paper shows the simulation about efficient control of power conversion which is related to DC power distribution of architecture and DC output of renewable energy by using L-type converter.

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A Study of Wind Energy Conversion System by a Secondary Control Hydrostatic Transmission (2차측 제어 정유압 변속기를 이용한 풍력발전시스템에 관한 연구)

  • Do, H.T.;Ahn, K.K.
    • Journal of Drive and Control
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    • v.10 no.1
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    • pp.21-28
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    • 2013
  • Wind energy has been more and more important and contributive in the energy utilization of the world. This paper proposed a novel method for Wind Energy Conversion System (WECS), in which a secondary control hydrostatic transmission (SC-HST) with two hydraulic accumulators, were employed for wind energy conversion system. This approach can absorb the excessive power of turbine, keep the generator from over-speed and maintain the speed of generator in low speed of turbine. A PID controller was designed for speed control to track a predefined speed. The simulation results indicated that the speed of the generator was ensured with the relative error less than 2%; and the efficiency of the proposed system was 70.4%.

The Design of DSP System for Power Conversion System Controller (전력변환 시스템 제어를 위한 고속 디지탈 신호처리 시스템의 설계)

  • Kim, J.S.;Sul, S.K.;Park, M.H.
    • Proceedings of the KIEE Conference
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    • 1991.11a
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    • pp.219-222
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    • 1991
  • It is difficult to adapt modern control theory to power conversion system for the price of real time control H/W and the difficulty of S/W implementation. But recent development of large integrated circuit make it possible that One-Chip microprocessor processes high speed arithmatic calculation used in control theory. Specially this chip is called Digital Signal Processing chip. So, this research developes high performance, high reliable digital control system using TMS320C30 of Texas Instrument for real time control in power conversion system.

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Variance of Harmonics Element due to Linear & Non-linear Load Quantity (선형 및 비선형 부하량에 따른 고조파 성분의 변화)

  • Kim, Jong-Gyeom;Son, Hong-Gwan;Lee, Eun-Ung
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.8
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    • pp.441-448
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    • 2002
  • Harmonics studies have been an important aspect of power conversion system analysis and design in recent years. Harmonics using power conversion device, have a harmful effect on power qualify. Nonlinear load such as converter causes harmonic and effects self & other system. There are linear and nonlinear loads in the end-user application. For filter design to reduce harmonics, it is important to understand how loads interact with each other. In this paper, effects on the power conversion system at the low voltage local bus are discussed.

Simulation Analysis of Control Methods for Parallel Multi-Operating System constructed by the Same Output Power Converters

  • Ishikura, Keisuke;Inaba, Hiromi;Kishine, Keiji;Nakai, Mitsuki;Ito, Takuma
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.3
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    • pp.282-288
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    • 2014
  • A large capacity power conversion system constructed by using two or more existing power converters has a lot of flexibility in how the power converters are used. However, at the same time, it has a problem of cross current flows between power converters. The cross current must be suppressed by controlling the system while miniaturizing the combination reactor. This paper focuses on two current control methods of a power conversion system constructed by using two power converters connected in parallel supplying the same power. In order to elucidate the control performance of cross current, each control method which are aimed at controlling cross current and not directly controlling it are examined in simulations.