• Title, Summary, Keyword: AC-AC converter

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DSP-based Current Programmed Control of Three Phase PWM AC-AC Boost Converter (3상 PWM AC-AC 부스트 컨버터의 DSP 기반 전류 프로그램 제어)

  • Choi Nam-Sup;Li Yulong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.1
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    • pp.27-32
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    • 2006
  • In this paper, a new scheme of current programmed control for three phase PWM AC-AC converter is presented. Compared to duty-ratio voltage control, current programmed control has several advantages such as reduction of system order, inherent current protection and robust output. By considering only the magnitude components, a similar scheme in the DC-DC converter can be extended to the three phase PWM AC-AC converter. The proposed current programmed control will be well adopted into various converter topologies though three phase PWM AC-AC boost converter is treated as an example. The converter analysis is carried out by applying the vector DQ transformation to obtain physical insight into the converter operation and to establish some important characteristic equations for control purpose. The experiment results show the validity of the proposed scheme.

Current-Programmed Control of Three Phase PWM AC-AC Boost Converter

  • Choi, Nam-Sup;Li, Yulong
    • Proceedings of the KIPE Conference
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    • pp.414-416
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    • 2005
  • In this paper, a new scheme of current programmed control for three phase PWM AC-AC converter is presented. By considering only the magnitude components, a similar scheme in the DC-DC converter can be extended to the three phase PWM AC-AC converter. The proposed current programmed control will be well adopted into various converter topologies though three phase PWM AC-AC boost converter is treated as an example. The converter analysis is carried out by applying the vector DQ transformation to obtain physical insight into the converter operation. Finally, the experiment result shows the validity of the proposed scheme.

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Universal power converter using High-Speed Switching (고속 스위칭에 의한 만능 전려변화기 구성)

  • Isnanto, Isnanto;Budhi, Prayoga;Choi, Woo-seok;Park, Sung-jun
    • Proceedings of the KIPE Conference
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    • pp.337-338
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    • 2013
  • Combination the several type of single phase power conversion utilized simply topology are proposed in this paper. Totally four kind of converter are investigated, they are Boost AC/AC Converter, Buck AC/AC Converter, Boost AC/DC Converter, and Buck DC/AC Converter. Two types action mode are presented to determine the functional of circuit. First is AC chopper action mode, representation of the AC/AC converter. AC chopper action mode offered the sinusoidal current waveform, better power factor, faster dynamics, and smaller input/output filter. They present high robustness, offer safe commutation and have high efficiency. The second is full bridge action mode, determined the transformation AC to DC power and otherwise. Four switching devices and one magnetic contactor will establish the mode operation of circuit and manage the flow of power proceed in proper. The correction and advance of the kind of converter are verified by simulation.

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Output voltage characterstics of the cascade connected Quasi-Z-source AC-AC converter (Cascade 연결된 Quasi Z-source AC/AC Converter의 출력전압 특성)

  • Oum, Jun-Hyun;Jung, Young-Gook;Lim, Young-Cheol;Oh, Seung-Yeol
    • Proceedings of the KIPE Conference
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    • pp.192-193
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    • 2010
  • 본 논문에서는 Quasi Z-source AC/AC converter를 cascade로 연결한 시스템의 출력 전압 특성을 고찰 한다. 제안된 시스템은 Quasi Z-source AC/AC converter의 buck-boost와 boost의 출력특성을 기본으로 하고 있으며, 각각 출력 단이 절연된 단상 Quasi Z-source AC/AC converter 2대가 cascade로 연결된 구조이다. 제안된 시스템의 응용으로는 고전압 대용량의 교류전원 시스템과 고정 주파수의 가변전압과 같은 분야이다. 본 논문에서는 제안된 시스템에 대하여 PSIM 시뮬레이션을 통하여 출력 특성을 고찰하였다.

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Static Characteristics Analysis of PWM Cuk AC-AC Converter for Power Quality Improvement of Custom Power (Custom Power의 전력품질 향상을 위한 PWM Cuk AC-AC 컨버터의 정적 특성 해석)

  • 최남섭
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.513-516
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    • 2004
  • In this paper, a PWM Cuk AC-AC converter for power quality improvement of custom power is presented. The PWM Cuk AC-AC converter that is used in VVCF applications such as AC line conditioner, phase shifter is modelled by using complex circuit DQ transformation whereby the static characteristics equations such as voltage gain and power factor is analytically obtained. Finally, the PSIM simulation show the validity of the modelling and analysis.

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High Power Factor 3-Phase AC-DC Converter without LC Filter (LC필터가 없는 고역율 3상 AC-DC 컨버터)

  • Nam, Jing-Rak
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.10
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    • pp.1894-1898
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    • 2007
  • Conventional 3-phase AC-DC converter is frequently in the industrial world. In this paper, the high power factor 3-phase AC-DC converter which can reduce its weight and volume is proposed. The high power factor 3-phase AC-DC converter without LC filter can realize light weight and low-cost. In spite of elimination of LC filter, the performance of the high power 3-phase AC-DC converter is almost the same as conventional 3-phase AC-DC converter. Finally, this result can be expected to be applied to aviation and the space industry with high power density and high power factor.

Single-phase Trans-Z-Source AC-AC Converter (단상 트랜스-Z-소스 AC-AC 컨버터)

  • Shin, Hyunhak;Chae, Junyoung;Joung, Minjae
    • Proceedings of the KIPE Conference
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    • pp.407-408
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    • 2015
  • The existing (q)Z-source PWM AC-AC converters have limited voltage gain because of the equivalent series resistance in the Z-source inductor. In order to obtain higher voltage gain than (q)Z-source AC-AC converters, a coupled inductor (or transformer) based Z-source AC-AC converter is proposed in this paper. By increasing turns ratio of the coupled inductor more than 1, the proposed converter can obtain higher output voltage than (q)Z-source converters with the same duty ratio. A 120 W prototype AC-AC converter is built and tested to verify performances of the proposed converter.

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A Study on PWM Buck-Boost AC-AC Converter for Improvement of Power Quality of Custom Power (Custom Power의 전력품질 향상을 위한 PWM Buck-Boost AC-AC 컨버터에 대한 연구)

  • Choi Nam-Sup
    • Proceedings of the KIPE Conference
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    • pp.129-132
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    • 2002
  • In this paper, a PWM Buck-Boost AC-AC converter for improvement of power quality of custom power is presented. The PWM Buck-Boost AC-AC converter is modelled by using circuit DQ transformation whereby the both static and dynamic characteristics are analyzed completely. Finally, the converter system is implemented with the design criteria and the experimental results show the validity of modelling and analysis.

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Design and Control of PWM Buck-Boost AC-AC Converter for Voltage Compensation (전압 보상을 위한 PWM Buck-Boost AC-AC 컨버터의 설계 및 제어)

  • Choi, Nam-Sup
    • Proceedings of the KIEE Conference
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    • pp.166-169
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    • 2003
  • In this paper, a PWM Buck-Boost AC-AC converter for improvement of power quality of custom power is presented. The PWM Buck-Boost AC-AC converter is modelled by using circuit DQ transformation whereby the design guideline is obtained. Based on the analysis, the converter system is implemented with the design criteria and the experimental results show the validity of modelling and analysis.

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Solving the commutation problem of single-phase PWM AC-AC converter using basic switching cell (스위칭 셀을 이용하여 커뮤테이션 문제를 해결한 단상 PWM AC-AC 컨버터)

  • Shin, Hyunhak;Cha, Honnyong;Kim, Heung-Geun
    • Proceedings of the KIPE Conference
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    • pp.194-195
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    • 2013
  • This paper presents novel single-phase PWM AC-AC converters that can solve commutation problem in single-phase direct AC-AC converter without sensing input voltage polarity. By using the basic switching cell concept and coupled inductor, the proposed converter can be short and open-circuit without damping switching devices. A 120 W prototype is built and tested to verify performance of the proposed converter.

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