• Title, Summary, Keyword: Inverter

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Enhanced Voltage Gain Single-Phase Current-Fed qZ-Source Inverter (전압 이득이 향상된 단상 전류형 qZ-소스 인버터)

  • Shin, Hyun-Hak;Cha, Hon-Nyong;Kim, Heung-Geun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.4
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    • pp.305-311
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    • 2013
  • This paper proposes a performance improvement of existing single-phase current-fed qZ-Source inverter. Voltage gain of the traditional voltage-fed full-bridge inverter and single-phase current-fed qZ-source inverter is only equal to or smaller than input voltage. The proposed inverter can obtain twice higher voltage gain than the single-phase current-fed qZ-Source inverter by adding an extra switch and a capacitor in the circuit. In addition, the proposed inverter shares the common ground between dc input and ac output voltage. Therefore, the proposed inverter can eliminate the possible ground leakage current problem when it is used for grid-tied photovoltaic inverter system. A 120 W prototype inverter is built and tested to verify performances of the proposed inverter.

A Novel Cost-Effective Two-Level Inverter with Combined Use of Thyristors and IGBTs

  • Chen, Dezhi;Zhao, Wenliang;Kwon, Byung-il
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.152-159
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    • 2018
  • In this paper, a novel topology of two-level voltage-type inverter is proposed. The proposed inverter has three bridge arms while each bridge is made up of two thyristors, one IGBT and four diodes. Thyristors complete the phase positioning of the inverter, IGBT completes the modulation of different modulation modes such as SPWM, SVPWM, and SHPWM, and the diodes complete the commutation of the bridge arms. Compared to the traditional voltage-type inverter with six IGBTs, the proposed voltage-type inverter using three IGBTs can achieve the same function with highly reduced cost. The principle of the proposed two-level inverter is explained in detail. The simulation and experiment results demonstrate the performance and effectiveness of the proposed inverter-type inverter.

Extended Boost Single-phase qZ-Source Inverter for Photovoltaic Systems

  • Shin, Hyun-Hak;Cha, Honnyong;Kim, Hongjoon;Kim, Heung-Geun
    • Journal of Power Electronics
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    • v.14 no.5
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    • pp.918-925
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    • 2014
  • This study presents an extended boost single-phase qZ-source DC-AC inverter for a single-phase photovoltaic system. Unlike the previously proposed single-phase qZ-source and semi-qZ-source inverters that achieve the same output voltage as that of the traditional voltage-fed full-bridge inverter, the proposed inverter can obtain higher output than input voltage. The proposed inverter also shares a common ground between DC input voltage and AC output voltage. Thus, possible ground leakage current problem in non-isolated grid-tied inverters can be eliminated with the proposed inverter. A 120 W prototype inverter is built and tested to verify the performance of the proposed inverter.

A Study for Characteristics of the Auxiliary Inverter in the 8200 Electric Locomotive (8200대 전기기관차 보조전원장치의 특성에 관한 연구)

  • Kim Jin-Yong;Lee Sang-Jun;Choi Jong-Mok;Kang Seung-Uk
    • Proceedings of the KSR Conference
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    • pp.237-244
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    • 2005
  • The Auxiliary Inverter supply the power to Loads of Electric Locomotive. The Auxiliary Inverter have three characteristics. First, The Auxiliary Inverter is VVVF(variable voltage variable frequency) inverter. And, the output voltage is AC $0^{\sim}440V$. Second, The Auxiliary Inverter is controled all operations by CCU(Center Control Unit). Last, The Auxiliary Inverter have the SIBMON program. This program easily displays most of all status of auxiliary inverter.

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A New Single Phase Multilevel Inverter Topology with Two-step Voltage Boosting Capability

  • Roy, Tapas;Sadhu, Pradip Kumar;Dasgupta, Abhijit
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1173-1185
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    • 2017
  • In this paper, a new single phase multilevel inverter topology with a single DC source is presented. The proposed topology is developed based on the concepts of the L-Z source inverter and the switched capacitor multilevel inverter. The input voltage to the proposed inverter is boosted by two steps: the first step by an impedance network and the second step by switched capacitor units. Compared to other existing topologies, the presented topology can produce a higher boosted multilevel output voltage while using a smaller number of components. In addition, it provides more flexibility to control boosting factor, size, cost and complexity of the inverter. The proposed inverter possesses all the advantages of the L-Z source inverter and the switched capacitor multilevel inverter like controlling the start-up inrush current and capacitor voltage balancing using a simple switching strategy. The operating principle and general expression for the different parameters of the proposed topology are presented in detail. A phase disposition pulse width modulation strategy has been developed to switch the inverter. The effectiveness of the topology is verified by extensive simulation and experimental studies on a 7-level inverter structure.

New Current-fed GTO Inverter and Its Basic Characteristics (전류형 GTO Inverter와 그 기본특성)

  • ;Kouki MATSUE
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.36 no.1
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    • pp.3-8
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    • 1987
  • The conventional autosequentially commutated current-fed inverter (ASCI) is widely employed with the induction motor drives for speed control. Howener, this inverter has a limit of high power and high frequency indution motor drives. One of the limitations is to be found in the commutation capacitors in the main circuit of this inverter. A new current-fed gate turn-off thyristor (GTO) inverter is developed. This inverter is composed of the main GTO bridge configuration and the improved energy rebound circuit (ERC)without the commutation capacitor. This inverter works stable at high frequency from light load to heavy one. The improved ERC is used not only to rebound the load reactive power to the dc link, but also to return the power in the load to the ac source. The new GTO inverter circuit and the characteristics of the inverter induction motor drives are explained and analyzed.

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A Study on Parallel Operation Between Inverter System and Utility Line (인버터 시스템과 상용 전력 계통과의 병렬 운전에 관한 연구)

  • 천희영;박귀태;유지윤;안호균
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.4
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    • pp.369-378
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    • 1992
  • This paper proposes a utility parallel processing inverter system, which consists of a voltage source PWM inverter, isolation transformer and a reactor linking the inverter to utility line. This system realizes following functions : (1) voltage phase frequency and amplitude synchronization between inverter and utility line at stand-alone mode. (2) current phase synchronization between inverter and load at parallel mode. Therefore, despite sudden increase in load current over setting point at stand-alone mode, inverter system can be transferred into parallel mode immediately without transient current. Furthermore, high frequency(18KHz) PWM control and sinusoidal filtering improve the inverter output waveform by eliminating high order harmonic components as well as low order. As a switching device, IGBT is used for high frequency switching and large current capacity.

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Flux Weakening Control for Surface Mounted Permanent Magnet Synchronous Machine Driven by Dual Inverter (이중 인버터를 이용한 표면 부착형 영구자석 동기전동기의 약자속 제어)

  • Kim, Youngnam;Lee, Yongjae;Ha, Jung-Ik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.437-442
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    • 2013
  • For open-end permanent magnet synchronous machine(PMSM) with dual inverter system, where one inverter is connected to the source and the other is flying, the dc link voltage of the flying inverter can be boosted through the machine. For this reason, when compared with single inverter drive system, higher voltage can be applied to PMSM, and higher torque can be generated in the flux weakening region. In this case, however, active and reactive powers are separately supplied by each inverter to maintain the dc link voltage of flying inverter. Therefore, the required flux weakening control is different from the conventional method for a single inverter drive system. This paper proposes the novel flux weakening control method which maximizes the active voltage component in a dual inverter PMSM drive system. The proposed method was demonstrated and verified through experimental results.

Characteristics of inverter-driven induction motor (인버터용 유도전동기의 특징)

  • Cho, K.J.
    • Proceedings of the KIEE Conference
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    • pp.60-63
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    • 1991
  • Nowadays inverters are widely used for energy-saving and factory automation. Accordingly the characteristics and functions of the inverter are well understood. To our surprise, the characteristics and functions of the inverter-driven induction motor are not well understood. In this technical review, the electrical and mechanical characteristics of the inverter-driven motor, the optimal combination of the inverter with motor, the special design of the inverter-driven motor, and the application of the inverter with the existing motor are given, based on ABB Drives' experiences and technical data.

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