• 제목/요약/키워드: Voltage source converter

검색결과 637건 처리시간 0.036초

Parallel Operation of Trans-Z-Source Network Full-Bridge DC-DC Converter for Wide Input Voltage Range

  • Lee, Hyeong-Min;Kim, Heung-Geun;Cha, Hon-Nyong
    • Journal of international Conference on Electrical Machines and Systems
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    • 제1권2호
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    • pp.98-104
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    • 2012
  • This paper presents a novel transformer isolated parallel connected full-bridge dc-dc converter using recently developed trans-Z-source network. Unlike the traditional voltage -fed or current-fed converters, the proposed converter can be open- and short-circuited without damaging switching devices. Therefore, the desired buck and boost function can be achieved and the converter reliability can be greatly improved. A 6 kW prototype dc-dc converter is built and tested to verify performances of the proposed converter.

3상 임베디드 Z-소스 인버터 (Three Phase Embedded Z-Source Inverter)

  • 오승열;김세진;정영국;임영철
    • 전력전자학회논문지
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    • 제17권6호
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    • pp.486-494
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    • 2012
  • In this paper, we proposes the three-phase embedded Z-source inverter consisting of the three embedded Z-source converters and it's the output voltage control method. Each embedded Z-source converter can produce the bipolar output capacitor voltages according to duty ratio D such as single-phase PWM inverter. The output AC voltage of the proposed system is obtained as the difference in the output capacitor voltages of each converter, and the L-C output filter is not required. Because the output AC voltage can be stepped up and down, the boost DC converter in the conventional two-stage inverter is unnecessary. To confirm the validity of the proposed system, PSIM simulation and a DSP based experiment were performed under the condition of the input DC voltage 38V, load $100{\Omega}$, and switching frequency 30kHz. Each converter is connected by Y-connection for three-phase loads. In case that the output phase voltage is the same $38V_{peak}$ as the input DC voltage and is the 1.5 times($57V_{peak}$), the simulation and experimental results ; capacitor voltages, output phase voltages, output line voltages, inductor currents, and switch voltages were verified and discussed.

PFC Bridge Converter for Voltage-controlled Adjustable-speed PMBLDCM Drive

  • Singh, Sanjeev;Singh, Bhim
    • Journal of Electrical Engineering and Technology
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    • 제6권2호
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    • pp.215-225
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    • 2011
  • In this paper, a buck DC-DC bridge converter is used as a power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of the PFC converter is a diode bridge rectifier (DBR) fed from single phase AC mains. The PMBLDCM is used to drive the compressor of an air conditioner through a three-phase voltage source inverter (VSI) fed from a variable voltage DC link. The speed of the air conditioner is controlled to conserve energy using a new concept of voltage control at a DC link proportional to the desired speed of the PMBLDC motor. Therefore, VSI operates only as an electronic commutator of the PMBLDCM. The current of the PMBLDCM is controlled by setting the reference voltage at the DC link as a ramp. The proposed PMBLDCM drive with voltage control-based PFC converter was designed and modeled. The performance is simulated in Matlab-Simulink environment for an air conditioner compressor load driven through a 3.75 kW, 1500 rpm PMBLDC motor. To validate the effectiveness of the proposed speed control scheme, the evaluation results demonstrate improved efficiency of the complete drive with the PFC feature in a wide range of speed and input AC voltage.

Time Varying 전원 전압을 고려한 PWM 컨버터 제어 (PWM Converter Control considering time varying source voltage)

  • 주인원;임선경;남광희
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1999년도 전력전자학술대회 논문집
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    • pp.692-695
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    • 1999
  • A new control scheme is proposed suitable for the three phase PWM converter having abrupt load variation such as a crane. In the converter used in a crane, the peak value of source voltage varies instantaneously due to the abrupt load variations. Such a voltage variation degrades the performance of DC-link control of PWM converter. To overcome this problem, load variations should be detected and compensated properly. We propose a new method for detecting and compensating the load variations without the additional hardware. With the proposed scheme, load variations are detected by estimating the current of DC-link capacitor. The estimated current information is feedbacked to a current controller to improve the performance. Additionally, the variation of source voltage is compensated using feedforward controller. The performance of the proposed scheme has been verified through simulations.

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Novel Voltage Source Converter for 10 kV Class Motor Drives

  • Narimani, Mehdi;Wu, Bin;Zargari, Navid Reza
    • Journal of Power Electronics
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    • 제16권5호
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    • pp.1725-1734
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    • 2016
  • This paper presents a novel seven-level (7L) voltage source converter for high-power medium-voltage applications. The proposed topology is an H-bridge connection of two nested neutral-point clamped (NNPC) converters and is referred to as an HNNPC converter. This converter exhibits advantageous features, such as operating over a wide range of output voltages, particularly for 10-15 kV applications, without the need to connect power semiconductors in series; high-quality output voltage; and fewer components relative to other classic seven-level topologies. A novel sinusoidal pulse width modulation technique is also developed for the proposed 7L-HNNPC converter to control flying capacitor voltages. One of the main features of the control strategy is the independent application of control to each arm of the converter to significantly reduce the complexity of the controller. The performance of the proposed converter is studied under different operating conditions via MATLAB/Simulink simulation, and its feasibility is evaluated experimentally on a scaled-down prototype converter.

승압형 PWM 싸이크로 콘버터에 관한 연구 (A Study on the Step-up PWM Cycloconverter)

  • 박민호;홍순찬;김기택
    • 대한전기학회논문지
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    • 제38권6호
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    • pp.431-440
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    • 1989
  • This paper proposes a new PWM cycloconverter which can step up input voltage. With input reactors ac power supply acts as current source, and with output capacitors the balanced output voltage is build-up. The converter is modeled with fourth order state equation using dq transformation and the steady state characteristics are evaluated. It is shown that the proposed converter can generate the output voltage 2-5 times greater than input voltage. The output voltage and input current have sinusoidal and smooth waveforms and the converter is capable of voltage build-up. The characteristics of the proposed converter is verified simulation and experiment.

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A Bidirectional Three-level DC-DC Converter with a Wide Voltage Conversion Range for Hybrid Energy Source Electric Vehicles

  • Wang, Ping;Zhao, Chendong;Zhang, Yun;Li, Jing;Gao, Yongping
    • Journal of Power Electronics
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    • 제17권2호
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    • pp.334-345
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    • 2017
  • In order to meet the increasing needs of the hybrid energy source system for electric vehicles, which demand bidirectional power flow capability with a wide-voltage-conversion range, a bidirectional three-level DC-DC converter and some control strategies for hybrid energy source electric vehicles are proposed. The proposed topology is synthesized from Buck and Boost three-level DC-DC topologies with a high voltage-gain and non-extreme duty cycles, and the bidirectional operation principle is analyzed. In addition, the inductor current ripple can be effectively reduced within the permitted duty cycle range by the coordinated control between the current fluctuation reduction and the non-extreme duty cycles. Furthermore, benefitting from duty cycle disturbance control, series-connected capacitor voltages can also be well balanced, even with the discrepant rise and fall time of power switches and the somewhat unequal capacitances of series-connected capacitors. Finally, experiment results of the bidirectional operations are given to verify the validity and feasibility of the proposed converter and control strategies. It is shown to be suitable for hybrid energy source electric vehicles.

HVDC 시스템의 SCR 사이리스터 밸브 시험을 위한 Full-Bridge Converter 방식의 개선된 전류원 회로 (Improved Current Source using Full-Bridge Converter Type for Thyristor Valve Test of HVDC System)

  • 정재헌;조한제;구법진;노의철;정용호;백승택
    • 전력전자학회논문지
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    • 제20권4호
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    • pp.363-368
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    • 2015
  • This paper deals with an improved current source using full-bridge converter type for thyristor valve test of HVDC system. The conventional high-current and low-voltage source of synthetic test circuit requires additional auxiliary power supply to provide the reverse voltage for the auxiliary thyristor valve during turn-off process. The proposed circuit diagram to provide the reverse voltage is extremely simple because no additional component is required. The reverse voltage can be obtained from the input DC voltage of the high-current and low-voltage power supply. The operation principle and design method of the proposed system are described. Simulation and experimental results in scaled down STC of 200 V, 30 A demonstrate the validity of the proposed scheme.

단상 풀 브리지 인버터를 이용한 SRM 컨버터 토폴로지 (The Converter with Full Bridge Inverter for the Switched Reluctance Motor Drives)

  • 장도현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 B
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    • pp.989-991
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    • 2001
  • The new converter topology using full bridge inverter for the switched reluctance motor drives is proposed. The proposed SRM drives are supplied by the pulse voltage source, while the conventional drives are supplied by dc voltage source. Proposed converter maintains the characteristics of asymmetric bridge converter and has advanced characteristics.

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단상 하프 브리지 인버터를 이용한 스위치드 리럭턴스 전동기용 컨버터 토폴로지 (The Converter with Half Bridge Inverter for the Switched Reluctance Motor Drives)

  • 장도현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.335-337
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    • 2001
  • The new converter topology using half bridge inverter for the switched reluctance motor drives is proposed. The proposed SRM drives are supplied by the pulse voltage source, while the conventional drives are supplied by de voltage source. Proposed converter does not lose the characteristics of classic converter though the total no. of power switches are reduced.

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