• Title/Summary/Keyword: PWM rectifiers

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Synchronous Carrier-based Pulse Width Modulation Switching Method for Vienna Rectifier

  • Park, Jin-Hyuk;Yang, SongHee;Lee, Kyo-Beum
    • Journal of Power Electronics
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    • v.18 no.2
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    • pp.604-614
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    • 2018
  • This paper proposes a synchronous switching technique for a Vienna rectifier that uses carrier-based pulse width modulation (CB-PWM). A three-phase Vienna rectifier, similar to a three-level T-type converter with three back-to-back switches, is used as a PWM rectifier. Conventional CB-PWM requires six independent gate signals to operate back-to-back switches. When internal switches are operated synchronously, only three independent gate signals are required, which simplifies the construction of gate driver circuits. However, with this method, total harmonic distortion of the input current is higher than that with conventional CB-PWM switching. A reactive current injection technique is proposed to improve current distortion. The performance of the proposed synchronous switching method and the effectiveness of the reactive current injection technique are verified using simulations and experiments performed with a set of Vienna rectifiers rated at 5 kW.

A Power Circuit Improvement of the Hybrid System Using Phase Controlled Rectifier and PWM Converter for Magnet Load Power Supply (자석-부하 전원장치를 위한 위상제어 정류기와 PWM 컨버터를 사용한 복합구조 시스템의 전력회로 개선)

  • Kang, Min-Gu;Shon, Jin-Geun;Jeon, Hee-Jong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.3
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    • pp.231-235
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    • 2008
  • Thyristor rectifiers are still the preferred choice for large magnet power supplies. However, large harmonic voltages, resulting in large current ripple, and slow dynamic response are major drawbacks of these converters. Joos presented a topology and a control technique for a hybrid large-power high-precision magnet power supply in 1996. The system consists of a phase controlled rectifier (PCR) connected in series with a high-frequency PWM converter. This paper improves the power circuit of the PWM converter using interphase transformer. Simulation result proves effect of the proposed system.

Study of 60Hz Transformer-less High Frequency Linked Grid-Connected Power Conditioners for Photovoltaic Power System (60Hz 절연변압기가 없는 고주파링크방식 계통연계형 태양광발전시스템 고찰)

  • 유권종;정영석;최주엽
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.6
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    • pp.563-569
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    • 2002
  • This paper proposes an inverter for the grid-connected photovoltaic system based on the transformer-less inverter. This system consists of a high frequency DC-DC converter, high frequency transformer, diode bridge rectifiers, a DC filter, a low frequency inverter, and an AC filter. The 20kHz switched high frequency converter is used to generate bipolar PWM pulse, and the high frequency transformer transforms its voltage twice, which is subsequently rectified by diode bridge rectifiers for a full-wave rectified 60 Hz sine wave power output. Even though the high frequency link system needs more power semiconductors, a reduced size, light weight, and saved parts cost make this system more comparative than other power conditioning systems due to elimination of 60Hz transformer.

New Uninterruptible Power Supply Using the Converter which is Secondary Auxiliary Soft Switching High Frequency Insulating PWM AC/DC (2차측 보조 소프트 스위칭 고주파 절연형 PWM AC/DC 컨버터를 이용한 새로운 무정전전원장치)

  • Suh, Ki-Young;Mun, Sang-Pil;Kim, Ju-Yong;Lee, Hyun-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.6
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    • pp.16-21
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    • 2005
  • In paper, propose new partial resonance ZCS PWM controlled High frequency insulating Full-bridge DC/DC converter not using exciting current of high frequency transformer. It is compared with the existing principles in characteristics. It also realizes a widely stabilized ZVS operating using new ON-OFF control method at synchronized power rectification MOSFET of high frequency insulating transformer secondary. Besides, it is brought over 97[%] measurement efficiency by proposed DC-DC converts. It is proved effectiveness of new methods using DC UPS PWM rectifier as switching power supply.

Stability and Performance Investigations of Model Predictive Controlled Active-Front-End (AFE) Rectifiers for Energy Storage Systems

  • Akter, Md. Parvez;Mekhilef, Saad;Tan, Nadia Mei Lin;Akagi, Hirofumi
    • Journal of Power Electronics
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    • v.15 no.1
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    • pp.202-215
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    • 2015
  • This paper investigates the stability and performance of model predictive controlled active-front-end (AFE) rectifiers for energy storage systems, which has been increasingly applied in power distribution sectors and in renewable energy sources to ensure an uninterruptable power supply. The model predictive control (MPC) algorithm utilizes the discrete behavior of power converters to determine appropriate switching states by defining a cost function. The stability of the MPC algorithm is analyzed with the discrete z-domain response and the nonlinear simulation model. The results confirms that the control method of the active-front-end (AFE) rectifier is stable, and that is operates with an infinite gain margin and a very fast dynamic response. Moreover, the performance of the MPC controlled AFE rectifier is verified with a 3.0 kW experimental system. This shows that the MPC controlled AFE rectifier operates with a unity power factor, an acceptable THD (4.0 %) level for the input current and a very low DC voltage ripple. Finally, an efficiency comparison is performed between the MPC and the VOC-based PWM controllers for AFE rectifiers. This comparison demonstrates the effectiveness of the MPC controller.

A New ZCS PWM Boost Converter with operating Dual Converter (Dual 컨버터로 동작하는 새로운 ZCS PWM Boost Converter)

  • Kim Tea-Woo;Chin Gi-Ho;Kim Hack-Sung
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.525-528
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    • 2002
  • A Novel Zero Current Switching(ZCS) Pulse Width Modulation(PWM) boost converter for reducing two rectifiers reverse recovery related losses Is proposed. The switches of the proposed converter are operating to work alternatively turn-on and turn-off with soft switching(ZVS, ZCS) condition. The reverse recovery related switching losses and EMI problems of the proposed converter eliminates the reverse recovery current of the freewheeling diode(D, Dl) by adding the resonant inductor Lr, in series with the switch S2. The voltage and current stresses of the components are similar to those in its conventional hard switching counterpats. As mentioned above, the characteristics are verified through experimental results.

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A New Injection Method of Harmonic Compensation Current by Active AC Power Filter (능동형 교류 전력 필터에 의한 고조파 보상전류의 새로운 주입방식)

  • 박민호;최규하
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.9
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    • pp.361-367
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    • 1985
  • A new injection method is proposed for active power filters to eliminate AC harmonics in ac input current of nonlinear loads such as rectifiers. By injecting the PWM current determined by the proposed injection method, all the harmonics up to order nn can be eliminated to exactly zero. This PWM injection current can be generated by sampling total harmonic wave at the rate of M and the sampled values are converted into the proposed PWM wave with N pulse-width variables and adjustable current magnitude Im. These variables are deetermined by solving a set of N nonlinear harmonic equations and the harmonic-elimination characteristics of the new injection are investigated through digital computer sinmulation. Also by comparing between the simulated results and the ones synthesized by data stored in EPROM, the possibility of the suggested injection method can be shown.

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Research on Carried-Based PWM with Zero-Sequence Component Injection for Vienna Type Rectifiers

  • Ma, Hui;Feng, Mao;Tian, Yu;Chen, Xi
    • Journal of Power Electronics
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    • v.19 no.2
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    • pp.560-568
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    • 2019
  • This paper studies the inherent relationship between currents and zero-sequence components. Then a precise algorithm is proposed to calculate the injected zero-sequence component to control the DC-Link neutral-point voltage balance, which can result in a more efficient and flexible neutral point voltage balance with a desirable performance. In addition, it is shown that carried-based PWM with the calculated zero-sequence component scheme can be equivalent to space-vector pulse-width modulation (SVPWM). Based on the proposed method, the optimal zero-sequence component of the feasible modulation indices is analyzed. In addition, the unbalanced load limitation of the DC-Link neutral-point voltage balance control is also revealed. Simulation and experimental results are shown to verify the validity and practicality of the proposed algorithm.

High-Frequency DC Link Inverter for Grid-Connected Photovoltaic System (고주파링크방식을 이용한 PV용 PCS의 고찰)

  • Jung, Young-Seok;Yu, Gwon-Jong;Jung, Myoung-Woong;Choi, Jae-Ho;Choi, Ju-Yeop
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1313-1315
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    • 2002
  • This paper proposes an inverter for the grid-connected photovoltaic system based on the transformer-less inverter. This system consists of a high frequency inverter bridge, high frequency transformer, diode bridge rectifiers, a DC filter, a low frequency inverter bridge, and an AD filter. The high frequency inverter bridge switching at 20kHz is used to generate bipolar PWM pulse, which is subsequently rectified by diode bridge rectifiers to result in a full-wave rectified sine wave. Finally, it is unfolded by a low frequency inverter bridge to result in a 60Hz sine wave power output. In this paper, the control algorithm for synchronous current feedback control method and a maximum power point tracking (MPPT) method using DSP are described. And, the simulation and experimental results are shown to verify the validity of the proposed system.

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Recent PV PCS Technology (국내외 PV PCS 기술현황)

  • Choi Ju-Yeop;You Gwon-Jon;Jeong Young-Seok;So Jeong-Hoon;Choy Ick
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.117-122
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    • 2005
  • This paper proposes an inverter for the grid-connected photovoltaic system based on the transformer-less inverter. This system consists of a high frequency converter bridge, high frequency transformer, diode bridge rectifiers, a DC filter, a low frequency inverter bridge, and an AC filter. The high frequency converter bridge switching at 20kHz is used to generate bipolar PWM pulse, and the high frequency transformer raise its voltage twice, which is subsequently rectified by diode bridge rectifiers to result in a full-wave rectified sine wave. Finally, it is unfolded by a low frequency inverter bridge to result in a 60Hz sine wave power output. Even though the high frequency link system needs more power semiconductors, a reduced size, light weight, and saved parts cost make this system more comparative than the other systems due to elimination of 60Hz transformer.

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