• Title/Summary/Keyword: Sinusoidal Input Current

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Sinusoidal Tracking Control of Voltage Source PWM Converter by Input Current Estimation (입력전류추정에 의한 전압형 PWM 컨버터의 정현추종제어)

  • 허태원;박지호;신동률;김춘삼;우정인
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.4
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    • pp.39-47
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    • 2000
  • This paper presents the sinusoidal tracking controller in error to eliminate the steady state control error and to improve the transient characteristics for input current in voltage source PWM converter with input current estimation. The estimation method of input current values and configuration of controller are described. DC output voltage is controlled by PI controller, and sinusoidal tracking current controller which tracks directly AC input current is used as input current controller. The sinusoidal tracking current controller can be used without any coordinate transformation algorithms.It is proved that the steady state deviation of input current reduces to zero and the proposed control system is not affected by input voltage from transfer functions of input current control system. The validity of proposed scheme is verified by simulations and experimental results for load resister and input voltage variation.

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Drawing Sinusoidal Input Currents of Series-Connected Diode Rectifiers by A Current Injection Technique (직렬접속형 다이오드 정류기 시스템의 전류주입에 의한 고조파 저감)

  • 최세완;오준용;원충연;김영석
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.346-349
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    • 1999
  • This paper proposes a new series-connected diode rectifier which draws sinusoidal input currents. The proposed rectifier system is configured by adding an auxiliary circuit to the conventional 12-pulse series-connected diode rectifier and employing a current injection technique. A low kVA (0.02Po (PU) ) active current source injects a triangular current results in near sinusoidal input current from the utility with less than 1% THD. The resulting system is suitable for high voltage and high power applications. Experimental results is provided from a 220VA rectifier system.

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The Improvement Effect of Input Current Waveform of Two New Main Switching Boost Rectifiers

  • Ha, Sung-Hyun;Kim, Chang-Il;Kim, Soo-Wook;Nam, Jing-Rak;Mun, Sang-Pil
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.3
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    • pp.15-26
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    • 2008
  • This paper proposes a new sinusoidal rectifier which improves input factor and input current waveform without complicated switching modulation such as pulse width or a complicated feed back control. The proposed rectifier consists of a pair of capacitors connected in series, a full bridge diode rectifier, a pair of inductors, and a pair of switching devices connected in series. While the configuration of the sinusoidal rectifier is simple in itself, it effectively reduces the reactive power and harmonics involved(IEC555-2 SC77A90 Class C) in input line current. The excellent properties of the new sinusoidal rectifier are verified by theoretical analysis and experimental results.

A Study on Power Factor Correction of CO2 Arc Welder Using Three Phase Switch Mode Converter (3상 AC/DC 스위치 모드 승압형 컨버터를 이용한 CO2 아크 용접기 역률개선에 관한 연구)

  • 이정훈;김재문;안정준;이상석;원충연;김세찬
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.149-153
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    • 1998
  • In this paper A switched mode AC/DC three phase boost converter with high power factor and sinusoidal input current waveform is analyzed and simulated. The proposed converter retain high power factor and sinusoidal input current waveform even under electric arc welder load. It is shown that experimental result and simulation waveform yield a sinusoidal input current waveform at high power factor.

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A Control Strategy to Obtain Sinusoidal Input Currents of Matrix Converter under Unbalanced Input Voltages

  • Nguyen, Thanh-Luan;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
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    • 2018.07a
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    • pp.114-116
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    • 2018
  • This paper presents a control strategy to achieve the balanced sinusoidal output currents, as well as sinusoidal input currents for the matrix converter (MC) under unbalanced input voltages. By regulating the modulation index of the converter according to the instantaneous input voltages, the output currents are kept balanced and sinusoidal. In order to obtain sinusoidal input currents, the input power factor angle should be dynamically calculated based on the positive and negative sequence components of the input voltages. This paper proposes a simple method to construct the expected input power factor angle without the complicated sequence component extraction of input voltages. Simulation results are given to validate the effectiveness of the proposed control strategy.

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An Efficiency improvement of Sinusoidal Converter for Power Factor Corection (역률 보정을 위한 정현 컨버터의 효율개선)

  • 서재호;이희승
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.432-435
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    • 1997
  • This Paper proposes a novel sinusoidal converter which improves input power factor and input current waveform without any complicated switching modulation such as a pulse width modulation or a complicated feed-back control. It is composed of a full bridge diode, a pair of capacitors, a pair of inductors and a pair of switching devices. The configuration and control strategy are both simple however, the sinusoidal converter effectively reduces reactive power and hamonics included in a input line current. Excellent behavior of the proposed converter is verified by theoretical analysis and experimental results.

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Sinusoidal Input Power factor Improved for Single-Phase Buck AC-DC Type Converter (정현파 입력 역률개선을 위한 단상 강압형 AC-DC 컨버터)

  • Jung, S.H.;Kwon, K.S.;Lee, H.W.
    • Proceedings of the KIEE Conference
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    • 2001.11c
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    • pp.338-340
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    • 2001
  • Power factor improved for single-phase buck-converter is studied in the paper. To sinusoidal waveform the input current with a near-unity power factor over a wide variety of operating conditions, the output capacitor is operated with voltage reversibility for the supply by arranging the auxiliary diode and power switching device. Then the output voltage is superposed on the input voltage during on time duration of power switching devices in order to minimize the input current distortion caused by the small input voltage when changing the polarity. The tested setup, using two insulated gate bipolar transistors(IGBT) and a microcomputer, is implemented and IGBT are switched with 20[kHz], which is out of the audible band. Moreover, a rigorous state-space analysis is introduced to predict the operation of the rectifier. The simulated results confirm that the input current can be sinusoidal waveform with a near-unity power factor and a satisfactory output voltage regulation can be achieved.

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Drawing Sinusoidal Input Currents of Series-Connected Diode Rectifiers by A Current Injection Technique (직렬접속형 다이오드 정류기 시스템의 전류주입에 의한 고조파 저감)

  • O, Jun-Yong;Choe, Se-Wan;Kim, Yeong-Seok;Won, Chung-Yeon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.11
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    • pp.640-645
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    • 1999
  • This paper proposes a new series-connected diode rectifier which draws sinusoidal input currents. The proposed rectifier system is configured by adding an auxiliary circuit to the conventional 12-pulse series-connected diode rectifier and employing a current injection technique. A low kVA($0.02P_{\circ}$(PU) ) active current source injects a triangular current into the interphase reactor of the diode rectifier. The current injection results in near sinusoidal input current from the utility with less than 1% THD. The resulting system is suitable for high voltage and high power applications. Experimental and simulation results are provided from a 220V, 3kVA prototype rectifier system.

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SVPWM controlled the Three-phase AC to DC Boost Converter for High Power Factor (SVPWM 방식의 3상 고역율 AC-DC Boost 컨버터)

  • Na, Jae-Hyeong;Lee, Jung-Hyo;Kim, Kyung-Min;Lee, Su-Won;Won, Chung-Yuen
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.10a
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    • pp.327-331
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    • 2008
  • The problems of power factor and harmonics are occurred in converter system which used to SCRs and diodes as power semiconductor devices IGBT was solved that problem, maintain the input line current with sinusoidal wave current of input power source voltage. In this paper, three phase AC to DC boost converter that operates with unity power factor and sinusoidal input currents is presented. The current control of the converter is based on the space vector PWM strategy with fixed switching frequency and the input current tracks the reference current within one sampling time interval. Space vector PWM strategy for current control was materialized as a digital control method. By using this control strategy low ripples in the output voltage, low harmonics in the input current and fast dynamic responses are achieved with a small capacitance in the dc link.

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A new PWM method for instantaneous output current control of matrix converters with sinusoidal input current

  • Sung K. M.;Kobayashi K;Sato Y.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.179-183
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    • 2001
  • This paper presents a simple current control strategy for matrix converters based on the extension of PWM method for inverters. A novel and efficient PWM algorithm is developed. The algorithm is verified through simulation and experiments employing a 2-kVA prototype. The results of simulation and experiment prove the instantaneous control capability of the output current with the sinusoidal input current.

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