• Title/Summary/Keyword: Three-phase power converter

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Characteristics of Non-Isolated OSAKA Converter -Characteristics of Three-Phase Soft-Switching Power Factor Corrected Converter for Large Scale Power Without Three-Phase Transformer-

  • Taniguchi, Katsunori;Shimomori, Wataru;Lee, Hyun-Woo
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1383-1386
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    • 2005
  • Non-isolated OSAKA Converter, which removes a three-phase transformer, is described in this paper. The converter switches once in every half cycle of an AC commercial power source. Therefore, it can solve many problems caused by the high frequency operation. The proposed converter achieves the soft-switching operation and the EMI noise can be reduced. In this circuit, the resonant capacitor, which is used for the soft-switching operation, is utilized for the improvement of an input current waveform. To achieve low cost and compact structure, non-isolated OSAKA converter removes a three-phase transformer of the OSAKA converter. By removing the three-phase transformer, three phase currents occur the interferences each other. To avoid the interference, a new switching method for non-isolated OSAKA converter is preposed. The converter can be constructed by the low-speed large power devices. The converter generates the low distorted input current waveforms with high power factor.

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Advanced Three-Phase PFC Power Converters with Three-Phase Diode Rectifier and Four-Switch Boost Chopper

  • Nishimura Kazunori;Hirachi Katsuya;Hiraki Eiji;Ahmed Nabil A.;Lee Hyun-Woo;Nakaoka Mutsuo
    • Journal of Power Electronics
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    • v.6 no.4
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    • pp.356-365
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    • 2006
  • This paper presents an improved three-phase PFC power rectifier with a three-phase diode rectifier cascaded four-switch boost converter. Its operating principle contains the operating principle of two conventional three-phase PFC power rectifiers: one switch boost converter type and a two switch boost converter type. The operating characteristics of the four switch boost converter type three-phase PFC power rectifier are evaluated from a practical point of view, being compared with one switch boost converter type and two switch boost converter topologies.

Two-Switch Auxiliary Resonant DC Link Snubber-Assisted Three-Phase Soft Switching PWM Sinewave Power Conversion System with Minimized Commutation Power Losses

  • Nagai, Shinichiro;Sato, Shinji;Ahmed, Tarek;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.3 no.4
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    • pp.249-258
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    • 2003
  • This paper presents a high-efficient and cost effective three-phase AC/DC-DC/AC power conversion system with a single two-switch type active Auxiliary Resonant DC Link (ARDCL) snubber circuit, which can minimize the total power dissipation. The active ARDCL snubber circuit is proposed in this paper and its unique features are described. Its operation principle in steady-state is discussed for the three phase AC/DC-DC/AC converter, which is composed of PWM rectifier as power factor correction (PFC) converter, sinewave PWM inverter. In the presented power converter system not only three-phase AC/DC PWM rectifier but also three-phase DC/AC inverter can achieve the stable ZVS commutation for all the power semiconductor devices. It is proved that the proposed three-phase AC/DC-DC/AC converter system is more effective and acceptable than the previous from the cost viewpoint and high efficient consideration. In addition, the proposed two-switch type active auxiliary ARDCL snubber circuit can reduce the peak value of the resonant inductor injection current in order to maximize total system actual efficiency by using the improved DSP based control scheme. Moreover the proposed active auxiliary two-switch ARDCL snubber circuit has the merit so that there is no need to use any sensing devices to detect the voltage and current in the ARDCL sunbber circuit for realizing soft-switching operation. This three-phase AC/DC-DC/AC converter system developed for UPS can achieve the 1.8% higher efficiency and 20dB lower conduction noise than those of the conventional three-phase hard-switching PWM AC/DC-DC/AC converter system. It is proved that actual efficiency of the proposed three-phase AC/DC-DC/AC converter system operating under a condition of soft switching is 88.7% under 10kw output power.

Modeling and Analysis of Three Phase PWM Converter (3상 PWM 컨버터의 모델링 및 해석)

  • 조국춘;박채운;최종묵
    • Proceedings of the KSR Conference
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    • 1999.05a
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    • pp.328-335
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    • 1999
  • Three phase full bridge rectifier has been used to obtain dc voltage from three phase ac voltage source. The rectifier system has drawbacks that power factor is low and power flow is unidirectional. Therefore, when dc voltage increases due to regeneration of power the dynamic resister for dissipation of regeneration power must be installed. But three phase PWM converter can be controlled to operate with unity power factor and bidirectional power flow. Therefore when the PWM converter is used as do supply system, the dissipating resistor is not necessary. On this thesis, in order to design a controller having good performance, the hee phase PWM converter is completely modeled by using circuit DQ-transformation and thus a general and simple instructive equivalent circuit is obtained; the inductor set becomes a second order gyrator-coupled system and three phase inverter becomes a transformer as well. Under given phase angle(${\alpha}$) and modulation index(MI) of the three phase inverter, the dc and ac characteristics are obtained by analysis of the transformed equivalent circuit The validity of the equivalent circuit is confirmed through PSPICE simulation. And based on the dc and ac characteristics a controller with unity power factor is proposed.

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A Low COST SOFT-SWITCHED AC-TO-TC CONVERTER

  • 최주엽;목형수;김택용
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.135-140
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    • 1997
  • A highly efficient single-phase/three-phase compatible ac-to-dc converter is proposed and analyzed, which includes three identical single-phase both soft-switched dc-to-dc converter with boost converter as a pre-regulator for input power factor correction (PFC). The proposed converter structure provides a cost reduction and easy implementation of compatibility between single-phase 220V and three-phase 220V/380V with their inputs in delta or wye connections.

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Three-phase Power Equalizing System with UPS Function based on Battery Storage (UPS 기능을 가지는 배터리 기반의 삼상 전력 평준화 시스템)

  • Kwon, Jung-Min
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.4
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    • pp.353-358
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    • 2012
  • In this paper, three-phase power equalizing system (PES) with UPS function is proposed. This system is based on NiMH battery with battery management system. The power conversion circuit is composed with the three-phase converter/inverter, the bi-directional converter, and the thyristor switches. The three-phase converter/inverter provides the power to the grid or get the power from the grid. Also, it operates as a UPS. The bi-directional converter charges or discharges the battery. The thyristor switches are used for connecting/disconnecting with the grid and the load. A 15 kW prototype is implemented for the verifying the performance of the proposed system.

Three-Phase AC-to-DC Resonant Converter Operating in High Power Factor Mode in High-Voltage Applications

  • Chaudhari, Madhuri A.;Suryawanshi, Hiralal M.;Kulwal, Abhishek;Mishra, Mahesh K.
    • Journal of Power Electronics
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    • v.8 no.1
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    • pp.60-73
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    • 2008
  • In this paper a three-phase ac-to-dc resonant converter with high input power factor and isolated output is proposed. To improve the input power factor of the converter, high frequency current is injected into the input of the three-phase diode bridge rectifier. It is injected through an impedance network consisting of a series of L-C branches from the output of the high frequency three-phase inverter. A narrow switching frequency variation is required to regulate the output voltage. A design example with different design curves is illustrated along with the component ratings. Experimental verification of the converter is performed on a prototype of 3 kW, 1000 V output, operating above 300 kHz. Experimental results confirm the concept of the proposed converter. Narrow switching frequency variation is required to regulate the output voltage.

POWER FACTOR CORRECTION OF CO2 WELDING MACHINE USING SINGLE-SWITCH THREE-PHASE AC/DC CONVERTER

  • Kim, Jse-Mun;Kim, Yuen-Chung;Ahn, Jung-Jun;Won, Chung-Yuen;Kim, Sei-Chan
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.663-667
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    • 1998
  • This paper describes for reducing harmonic distortion on CO2 welding machine with nonlinear load characteristic using single-switch three-phase AC/DC converter. The low-order harmonic component amplitude of the phase current of single-switch three-phase discontinuous mode is calculated. Experimental results show that CO2 welding machine with single-switch three-phase AC/DC converter is effectively controlled with power factor correction for phase current during welding time.

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Three-Phase Interleaved Isolated High Efficiency Boost Converter (인터리브 방식 삼상 절연형 고효율 부스트 컨버터)

  • Choi, Jung-Wan;Cha, Han-Ju
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.6
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    • pp.496-503
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    • 2009
  • In this paper, a new three-phase interleaved isolated high efficiency boost dc-dc converter with active clamp is proposed. The converter is capable of increased power transfer due to its three-phase power configuration, and it reduces the rms current per phase, thus reducing conduction losses. Further, interleaved operation of three-phase boost converter reduces overall ripple current, which is imposed into fuel cells and realizes smaller sized filter components, increasing effective operating frequency and leading to higher power density. Each output current of three-phase boost converter is combined by the three-phase transformer and flows in the continuous conduction mode by the proposed three-phase PWM strategy. An efficiency of above 96% is mainly achieved by reducing conduction losses and switching losses are reduced by the action of active clamp branches, as well. The proposed converter and three-phase PWM strategy are analyzed, simulated and implemented in hardware. Experimental results are obtained on a 500 W prototype unit, with all of the design verified and analyzed.

Novel Converter Topology for a Three Phase to Three Phase PWM Rectifier/Inverter System (비용절감형 컨버터 구조를 갖는 3상-3상 PWM 정류기/인버터 시스템)

  • Kim, Gi-Taek;Park, Tae-Yeol;Lee, Hae-Chun
    • Journal of Industrial Technology
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    • v.18
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    • pp.323-328
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    • 1998
  • A current controlled VSI-PWM rectifier and inverter with capacitor dc link is regarded as one of the most promising structures for three-phase to three-phase to three-phase power conversion. This type of converter normally requires twelve switches for a rectifier and inverter composed of self turn-off switch such as a bi-polar transistor or IGBT with an anti-parallel diode. In this paper, a new three-phase to three-phase converter for ac motor drives is proposed. The proposed converter employs only eight switches and has the capability of delivering sinusoidal input currents with unity power factor and bidirectional power flow. This paper describes the feasibility and the operational limitations of the proposed structure. A mathematical model of the system is derived using generalized modulation theory and experimental results for steady state and dynamic behavior are presented to verify the developed model.

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