• 제목/요약/키워드: reduction DC voltage

검색결과 270건 처리시간 0.024초

Implementation of Multilevel Boost DC-Link Cascade based Reversing Voltage Inverter for Low THD Operation

  • Rao, S. Nagaraja;Kumar, D.V. Ashok;Babu, Ch. Sai
    • Journal of Electrical Engineering and Technology
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    • 제13권4호
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    • pp.1528-1538
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    • 2018
  • In this paper, configuration of $1-{\phi}$ seven-level boost DC-link cascade based reversing voltage multilevel inverter (BDCLCRV MLI) is proposed for uninterrupted power supply (UPS) applications. It consists of three level boost converter, level generation unit and full bridge circuit for polarity generation. When compared with conventional boost cascaded H-bridge MLI configurations, the proposed system results in reduction of DC sources, reduced power switches and gate drive requirements. Inverter switching is accomplished by providing appropriate switching angles that is generated by any optimization switching angle techniques. Here, round modulation control (RMC) method is taken as the optimization method and switching angles are derived and the same is compared with various switching angles methods i.e., equal-phase (EP) method, and half-equal-phase (HEP) method which results in improved quality of obtained AC power with lowest total harmonic distortion (THD). Reduction in DC sources and switch count makes the system more cost effective. A simulation and prototype model of $1-{\phi}$ seven-level BDCLCRV MLI system is developed and its performance is analyzed for various operating conditions.

Common Arm을 이용한 새로운 고성능 단상 전압조정기에 관한 연구 (A Novel, High-performance Single-phase Voltage Regulator using Common Arm)

  • 박성준;박한웅;송달섭;이만형;김철우
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제48권7호
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    • pp.369-375
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    • 1999
  • This paper presents the novel low-performance single-phase voltage regulator which has common arm between the AC/DC and DC/AC power converters and adopts appropriate switching strategy, resulting in the reduction of the number of switching devices. Moreover, by introducing the method to replace the method to replace the conventional AC condenser in filter circuit with the new low-cost type using two DC condenser, the whole voltage regulator system can be more compact, simpler and less expensive than conventional ones. The fully digital controller is designed using high speed DSP, and the proposed system is validated through the experimental results.

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단일 소프트 스위칭 셀을 가진 다상 Interleaved ZVT Boost 컨버터 (Multi-Phase Interleaved ZVT Boost Converter With a Single Soft-Switching Cell)

  • 이주승;황윤성;강승현;권만재;장은수;이병국
    • 전력전자학회논문지
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    • 제27권3호
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    • pp.247-255
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    • 2022
  • This paper proposes a multiphase interleaved zero-voltage-transition boost converter with a single soft-switching cell for high-voltage DC-DC converter (HDC) of fuel cell systems. The proposed single soft-switching cell structure can reduce the system volume by minimizing the passive and active elements added even in the multiphase-interleaved structure. To analyze the feasibility of the proposed structure, this paper mathematically analyzes the operation modes of the converter with the proposed single soft-switching cell structure and presents guidelines for design and considerations. In addition, the feasibility of the 210[kW] HDC was confirmed through PSIM simulation, and the system volume reduction of up to 10.48% was confirmed as a result of the 5[kW] HDC test-bed experiment considering the fuel cell system. Through this, the validity of the proposed structure was verified.

Analytic Model of Four-switch Inverter-fed Driving System for Wye or Delta-connected Motor with Current Ripple Reduction Scheme

  • Lee, Dong-Myung;Jung, Jin-Woo;Heo, Seo Weon;Kim, Tae Heoung
    • Journal of Electrical Engineering and Technology
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    • 제11권1호
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    • pp.109-116
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    • 2016
  • This paper proposes an analytic model for four-switch inverter (FSI)-driven wye (Y) or delta (Δ)-connected motors with a current ripple reduction algorithm. FSIs employ four switches in controlling three-phase load instead of using six switches. They have split dc-link stage, and due to this inherent structure there exists the voltage difference between upper and lower capacitors, which results in distortion of the inverter output voltage. To study characteristics of FSIs, this paper presents an advanced simulation models of FSI-driven control system for 3-phase motor that can has a wire connection either Y or Δ. In addition, this paper introduces a current ripple reduction scheme that mitigates degradation of control performance due to the voltage difference between the dc-link capacitors. The validity of the proposed method and the analytic model is verified by simulations and experiments carried out with 1-HP induction machine with Y or Δ-connection

A Ringing Surge Clamper Type Active Auxiliary Edge-Resonant DC Link Snubber-Assisted Three-Phase Soft-Switching Inverter using IGBT-IPM for AC Servo Driver

  • Yoshitsugu, Junji;Yoshida, Masanobu;Hiraki, Eiji;Inoue, Kenji;Ahmed, Tarek;Nakaoka, Mutsuo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제2B권3호
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    • pp.115-124
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    • 2002
  • This paper presents an active auxiliary edge-resonant DC link snubber with a ringing surge damper and a three-phase voltage source type zero voltage soft-switching inverter with the resonat snubber treated here for the AC servo motor driver applications. The operation of the active auxiliary edge-resonant DC link snubber circuit with PWM voltage is described, together with the practical design method to select its circuit parameters. The three-phase voltage source type soft-switching inverter with a single edge-resonant DC link snubber treated here is evaluated and discussed for the small-scale permanent magnet (PM) type-AC servo motor driver from an experimental point of view. In addition to these, the AC motor stator current and its motor speed response for the proposed three-phase soft-switching inverter employing Intelligent Power Module(IPM) based on IGBTS are compared with those of the conventional three-phase hard-switching inverter using IPM. The practical effectiveness of the three-phase soft-switching inverter-fed permanent magnet type AC motor speed tracking servo driver is proven on the basis of the common mode current in a novel type three-phase soft-switching inverter-fed AC motor side and the conductive noise on the mains terminal interface voltage as compared with those of the conventional three-phase hard-switching inverter-fed permanent magnet type AC servo motor driver for the speed tracking applications.

12상 다중 GTO 인버터 (12 Phase Multiple GTO Inverter)

  • 오동섭;이규종;성세진;최수현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1990년도 추계학술대회 논문집 학회본부
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    • pp.291-294
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    • 1990
  • Fuel cell system needs DC-AC conversion inverter system because its output is DC. And the inverter system can be operated not only in stand-alone load but also in interactive mode in interactive mode, it is necessary to control active-reactive power of inverter and to synchronize inverter output voltage to power line voltage. In this paper, a 12 phase multiple VSI type GTO inverter system for fuel cell is described. Synchronization between power line voltage phase and inverter output voltage phase, and reduction of harmonics in the output voltage phase are the purpose of this inverter system. This control algorithm for the system is realized by the software method utilizing 8031AH 8bit Microprocessor.

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A Novel Multi-Level Inverter Configuration for High Voltage Conversion System

  • Suh, Bum-Seok;Lee, Yo-Han;Hyun, Dong-Seok
    • Journal of Electrical Engineering and information Science
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    • 제1권2호
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    • pp.109-118
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    • 1996
  • This paper deals with a new multi-level high voltage source inverter with GTO Thyristors. Recently, a multi-level approach seems to be the best suited for implementing high voltage conversion systems because it leads to harmonic reduction and deals with safe high power conversion systems independent of the dynamic switching characteristics of each power semiconductor device. A conventional multi-level inverter has some problems; voltage unbalance between DC-link capacitors and larger blocking voltage across the inner switching devices. To solve these problems, the novel multi-level inverter structure is proposed.

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Brushless DC Motor에서 토크리플 저감을 위한 전환 구간에서의 전류제어 기법 (A Current Control Strategy for Torque Ripple Reduction on Brushless DC Motor during Commutation)

  • 권경준;김상훈
    • 전력전자학회논문지
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    • 제9권3호
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    • pp.195-202
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    • 2004
  • 본 연구에서는 Brushless DC Motor의 전환구간에서 토크리플 저감을 위한 전류제어 기법을 제안하였다. 전환구간에서 토크리플은 증가하는 전류의 변화율과 감소하는 전류의 변화율이 같지 않음에 주원인이 있고, 실제 역기전력의 모양에 의해서도 영향을 받는다. 이에 제안된 제어기법은 전환하는 전류들의 변화율을 같게 하는 실제 역기전력이 고려된 보상전압을 추하고, 전환구간동안에만 보상전압을 인가함으로써 토크리플을 줄이는 것이다. 시뮬레이션과 실험 결과는 제안된 방법이 토크와 전류의 리플을 현저히 줄일 수 있음을 보여준다.

A Flyback-Assisted Single-Sourced Photovoltaic Power Conditioning System Using an Asymmetric Cascaded Multilevel Inverter

  • Manoharan, Mohana Sundar;Ahmed, Ashraf;Park, Joung-Hu
    • Journal of Power Electronics
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    • 제16권6호
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    • pp.2272-2283
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    • 2016
  • This paper proposes a power conditioning system (PCS) for distributed photovoltaic (PV) applications using an asymmetric cascaded multilevel inverter with a single PV source. One of the main disadvantages of the cascaded multilevel inverters in PV systems is the requirement of multiple isolated DC sources. Using multiple PV strings leads to a compromise in either the voltage balance of individual H-bridge cells or the maximum power point tracking (MPPT) operation due to localized variations in atmospheric conditions. The proposed PCS uses a single PV source with a flyback DC-DC converter to facilitate a reduction of the required DC sources and to maintain the voltage balance during MPPT operation. The flyback converter is used to provide input for low-voltage H-bridge cells which processes only 20% of the total power. This helps to minimize the losses occurring in the proposed PCS. Furthermore, transient analyses and controller design for the proposed PCS in both the stand-alone mode and the grid-connection mode are presented. The feasibility of the proposed PCS and its control scheme have been tested using a 1kW hardware prototype and the obtained results are presented.

Verification of New Family for Cascade Multilevel Inverters with Reduction of Components

  • Banaei, M.R.;Salary, E.
    • Journal of Electrical Engineering and Technology
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    • 제6권2호
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    • pp.245-254
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    • 2011
  • This paper presents a new group for multilevel converter that operates as symmetric and asymmetric state. The proposed multilevel converter generates DC voltage levels similar to other topologies with less number of semiconductor switches. It results in the reduction of the number of switches, losses, installation area, and converter cost. To verify the voltage injection capabilities of the proposed inverter, the proposed topology is used in dynamic voltage restorer (DVR) to restore load voltage. The operation and performance of the proposed multilevel converters are verified by simulation using SIMULINK/MATLAB and experimental results.