• Title/Summary/Keyword: Power conversion system

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Integrated Operation of Power Conversion Module for DC Distribution System (직류 배전 시스템을 위한 전력 변환 모듈의 통합 운전)

  • Lee, Hee-Jun;Shin, Soo-Choel;Hong, Suk-Jin;Won, Chung-Yuen
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.3
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    • pp.240-248
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    • 2014
  • It is DC power that Output of renewable energy being recently developed and researched. Also, demand of DC power will expect to proliferate due to increase of digital load. Thus, DC distribution system providing high quality of power and reliability has emerged as a new distribution system. If the conventional distribution systems are substituted by proposed DC distribution system, the output of renewable energy can be connected with distribution systems under minimum power conversion. Therefore, in the event of connection with DC load, it can construct an efficient distribution system. In this paper, the integrated parallel operation of power conversion module for DC distribution system is proposed. Also, this paper proposed modularization of power conversion devices for DC distribution system and power control for parallel operation of large capacity system. DC distribution system consists of three power conversion modules such as AC/DC power conversion module 2 set, ESS module 1 set. DC distribution system controls suitable operation depending on the status of the DC power distribution system and load. Integrated operation of these systems is verified by simulation and experiment results.

A study on the power conversion system using Dye-Sensitized Solar cell (DSC를 활용한 상용전력변환 시스템에 관한 연구)

  • Kim, Jin-Young;Park, Sung-June;Park, Hae-Young;Kim, Woo-Sung;Kim, Hwi-Young;Kim, Hee-Je
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.195-198
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    • 2006
  • The technology of Solar Power conversion System is defined as a solar cell that changes the sol ar energy into the direct electric energy, power conversion and control technology that convert the dc power into ac power The solar cell module, power conversion, and a control part in component parts consisting a solar power conversion system have influence on its performance. The roles of power conversion and a control part supply the direct current generated by solar cell module for a load with high efficiency as conveniently as possible in this study, the power conversion systen that can generate solar power using DSC module was developed and its characteristics was experimented. The characteristics of the DSC power conversion system including MOSFET and DSP micro processor, high speed devices, was simulated using Psim. According to the results, converter and inverter was manufactured in detail and the performance characteristics were studied.

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Energy Conversion System using a Novel Multi-Mode DC/DC Converter for Hybrid Electric Vehicles (새로운 멀티 모드 DC-DC 컨버터를 이용한 하이브리드 전기자동차용 전력변환 시스템)

  • Park, Tae-Sik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.2
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    • pp.192-198
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    • 2013
  • The rapidly growing demand for electric power systems in electric vehicles (EVs) and hybrid electric vehicles (HEVs) require simpler, cost-effective, and higher performance components. In this paper, a novel power conversion system for hybrid electric vehicles is proposed for these needs. The proposed power conversion system reduces the conversion system cost while preserving same functionality. The proposed power conversion system can boost multi-sources to drive a traction motor and to store energy at the same time reducing number of switching components. In this paper, all operational modes of the proposed converter are explained in detail and verified by a computer simulation first. Then, the topology and operational modes are experimentally verified. Based on the results, the feasibility of the proposed multi-mode single leg power conversion system for EV and HEV applications is discussed.

Comparative Study on 220V AC Feed System and 300V DC Feed System for Internet Data Centers

  • Kim, Hyo-Sung
    • Journal of Power Electronics
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    • v.12 no.1
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    • pp.157-163
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    • 2012
  • Internet Data Centers (IDCs), which are essential facilities in the modern IT industry, typically have scores of MW of concentrated electric loads. The provision of an Uninterruptible Power Supply (UPS) is necessary for the power feed system of IDCs owing to the need for stable power. Thus, conventional IDC AC power feed systems have three cascaded power conversion stages, (AC-DC), (DC-AC), and (AC-DC), resulting in a very low conversion efficiency. In comparison, DC power feed systems require only a single power conversion stage (AC-DC) to supply AC main power to DC server loads, resulting in comparatively high conversion efficiency and reliability [4-11]. This paper compares the efficiencies of a 220V AC power feed system with those of a 300V DC power feed system under equal load conditions, as established by the Mok-Dong IDC of Korea Telecom Co. Ltd. (KT). Experimental results show that the total operation efficiency of the 300V DC power feed system is approximately 15% higher than that of the 220V AC power feed system.

Development of firing equipment and monitoring system for electric power conversion system for high voltage and large current (고압 대전류용 전력변환 점호장치 및 감시시스템 개발)

  • Lee Joo-Hyun;Lim Ick-Hun;Ryu Ho-Sun
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.481-484
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    • 2006
  • A electric power conversion system in a pumped storage power plant is important equipment for converting electric motor kinetic energy into electric power. A electric power conversion monitoring system consists of high voltage thyristor firing equipment, fault detection module, data gathering module, real time data processing equipment and man machine interface system. This paper describes electric power conversion system overview, the developed SFC monitoring system configuration including system characteristics, and successful application result to San-Cheong pumped storage power plant.

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Improving power conversion efficiency of the passive transponder (Passive 트랜스폰더에서의 전력변환 효율 향상을 위한 연구)

  • Kim, Kwang-Soo;Lee, Kyo-Sung;Kim, Yang-Mo
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.1951-1953
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    • 1998
  • In this study, we present the power conversion system of the passive transponder which is operated at 2.4GHz. First, The passive transponder which is the power conversion system is one of the passive transponder elements is presented. And then the power conversion system is analyzed and simulated.

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Design and Control of Novel Topology for Photovoltaic DC/DC Converter with High Efficiency under Wide Load Ranges

  • Lee, Jong-Pil;Min, Byung-Duk;Kim, Tae-Jin;Yoo, Dong-Wook;Yoo, Ji-Yoon
    • Journal of Power Electronics
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    • v.9 no.2
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    • pp.300-307
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    • 2009
  • In this paper, design and control is proposed for a four input-series-output-series-connected ZVS full bridge converter for the photovoltaic power conditioning system (PCS). The novel topology for a photovoltaic (PV) DC/DC converter that can dramatically reduce the power rating and increase the efficiency of a PV system by analyzing PV module characteristics is proposed. The control scheme, including an input voltage controller is proposed to achieve equal sharing of the input voltage as well output voltages by a four series connected module. Design methods for ZVS power stage are also introduced. The total PV system is implemented for a 250-kW PV power conditioning system (PCS). This system has only three DC/DC converters with a 25-kW power rating and uses only one-third of the total PV PCS power. The 25-kW prototype PV DC/DC converter is introduced to verify experimentally the proposed topology. In addition, an experimental result shows that the proposed topology exhibits good performance.

Comparative Study on AC and DC Feed System for Internet Data Center (인터넷데이터센터의 교류, 직류급전시스템 비교 분석)

  • Kim, Du-Hwan;Kim, Hyo-Sung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.1
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    • pp.27-33
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    • 2012
  • Internet Data Centers (IDC), as essential facilities for modern IT industry, typically have scores of MW of concentrated electric loads. Uninterruptible Power Supplies (UPS) are necessary for the power feed system of IDCs because of stable power requirement. Thus, conventional AC power feed systems of IDCs have three cascaded power conversion stages such as (AC-DC), (DC-AC), and (AC-DC), which results in very low conversion efficiency. On the contrary, DC power feed systems need just a single power conversion stage (AC-DC) supplying AC mains power to DC server loads, which gives comparatively high conversion efficiency and reliability. This paper compares the efficiencies between 220V AC power feed system and 300V DC power feed system on equal load conditions which were established in Mok-Dong IDC of Korea Telecom company (KT). Experimental results show that the total operation efficiency of the 300V DC power feed system is around 15% higher than that of the 220V AC power feed system.

Efficiency Comparison according to Power Conversion Method and Performance Estimation for Battery Source BLDC Motor Propulsion System of Small Ships (축전지 전원을 사용한 소형선박 추진용 BLDC모터의 전력변환방식에 따른 효율 비교 및 성능 추정)

  • Jeong, T.Y.;Jeong, S.K.
    • Journal of Power System Engineering
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    • v.14 no.1
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    • pp.27-33
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    • 2010
  • We investigate some operation characteristics and energy efficiency of the BLDC motor system driven by different two types power conversion method depends on same battery source for applying to electrical motor propulsion system of a small ship. Also, we suggest an estimation manner of operating performances such as total running distance and operating speed of ships from basic discharge voltage characteristics of batteries. Through some experiments, direct power conversion was better than indirect method on the view point of energy efficiency and the voltage discharge characteristics could be used as important design factor for estimating operating performances of small ships driven by electrical motors.

Control and Implementation of Dual-Stator-Winding Induction Generator for Variable Frequency AC-Generating System

  • Bu, Feifei;Hu, Yuwen;Huang, Wenxin;Shi, Kai
    • Journal of Power Electronics
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    • v.13 no.5
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    • pp.798-805
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    • 2013
  • This paper presents the control and implementation of the dual-stator-winding induction generator for variable frequency AC (VFAC) generating system. This generator has two sets of stator windings embedded into the stator slots. The power winding produces the VFAC power to feed the loads, and the control winding is connected to the static excitation controller to control the generator for output voltage regulation with speed and load variations. On the basis of the idea of power balance, an instantaneous slip frequency control (ISFC) strategy using the information of both the output voltage and the output power is used in this system. A series of experiments is carried out on a 15 kW prototype for verification. Results show that the system has good static and dynamic performance in a wide speed range, which demonstrates that the ISFC strategy is suitable for this system.