• Title/Summary/Keyword: Parallel converter

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Photovoltaic Generation by Parallel Driving of Modified Buck-boost Converter (변형된 승강압 컨버터의 병렬구동에 의한 태양광발전)

  • Lee Hee-Chang;Park Sung-Jun;Park Soo-Sik;Moon Chae-Joo;Lee Man-Hyung;Kim Jong-Dal
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.5
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    • pp.457-466
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    • 2004
  • In this paper, a modified converter is presented and analyzed to use as a photovoltaic converter. And also a new parallel driving scheme is proposed to increase output power and to reduce the output voltage ripple. The ratio of the output to the input voltage of the modified converter is equal to that of the boost converter. The difference between both converters is the composition of output terminal. Owing to the discrepancy, a working voltage of the output capacitor of the modified converter becomes lower, thus the capacitance value of the capacitor can be smaller than that of the boost converter. The proposed parallel driving is based on the modified converter and a current-mode-control method. It gives a good solution for alleviating the current sharing unbalance problem of conventional parallel operations. It reduces the output voltage ripple by means of increasing the equivalent switching frequency without additional switching losses. The validity of the proposed parallel driving strategy is verified through computer-aided simulations and experimental results.

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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    • v.1 no.2
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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.

Analysis of Parallel-Input Series-Output(PISO) Boost Converter With Output Voltage Balancing Characteristic (병렬입력/직렬출력(PISO) 부스트 컨버터의 출력 전압 밸런싱 특성 해석)

  • Nam, Hyun-Taek;Cha, Honnyong;Kim, Heung-Geun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.1
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    • pp.40-46
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    • 2018
  • In this study, the output voltage balancing characteristics of parallel-input series-output (PISO) boost converter is analyzed. The PISO boost converter is derived by combining two basic boost converters. In comparison with the conventional three-level boost converter, the PISO boost converter can balance the output voltages under an unbalanced load condition without requiring additional circuit components and control strategy. A 2 kW prototype converter is built and tested to verify the output voltage balancing characteristics of the PISO boost converter.

An improved LCLC Resonant Converter using Auxiliary winding of Resonant Inductor (공진 인덕터 보조권선을 이용한 개선된 LCLC 공진형 컨버터)

  • 백주원;이영식;정창용;조정구;김흥근
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.472-475
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    • 1999
  • An improved series-parallel resonant converter using auxiliary winding of resonant is presented. The conventional series-parallel resonan converter and newly developed converter are compared for high voltage application. This proposed converter gives several merits such a wide load ranges, small circulating current, low peak voltage at no load. Two experimental results for the proposed converter and conventional one are presented for conventional LCC type converter and the proposed one.

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A Cyclic-Parallel Analog-to-Digital Converter (순환-병렬형 아나로그-디지틀 변환기)

  • Chung, W.S.;Kim, H.B.;Kwak, G.D.;Park, K.M.;Son, S.H.
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.1166-1169
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    • 1987
  • A new analog-la-digital structure. called cyclic-parallel analog-to-digital(A/D) converter, has been developed for video applications. It consists of a M-bit parallel A/D converter, a digital-to-analog(D/A) converter, a differencing amplifier with gain of $2^M$ and two sample-and-hold circuits. In this structure, the input signal is circulated around the circuits K times, thereby converted into a MK-bit digital word. The proposed converter retains speed advantages of conventional series-parallel converters, with half reduced circuit components.

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Parallel Control Algorithm of Thyristor Dual Converter Power System for DC Power Substation of Railway (철도 직류 급전용 싸이리스터 이중 컨버터 전력 시스템의 병렬운전 기법)

  • Kim, Young-Woo;Moon, Dong-Ok;Lee, Chang-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.1
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    • pp.9-17
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    • 2017
  • A parallel control algorithm of thyristor dual-converter power system for the DC power supply of railway is proposed. The circulating current and current imbalance generated during parallel operation can be limited to control the output voltage of each power system by using the proposed parallel control algorithm. The proposed control algorithm can also eliminate output current sensor to achieve the same output response without additional costs. The validity of the proposed algorithm is verified through simulation and experiment.

A Study on Three Parallel Operation Control Algorithm of Thyristor Dual Converter System for Urban Railway Substation (도시 철도용 사이리스터 듀얼 컨버터 시스템의 3병렬 운전 제어 기법에 관한 연구)

  • Kim, Sung-An;Han, Sung-Woo;Cho, Yun-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.2
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    • pp.459-467
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    • 2017
  • An urban railway power substation consists of three thyristor dual converters. Two converters are connected to up and down trolley line to supply the electric energy or feed the regenerative energy back to the distribution. When the two converters break down, the remaining converter is used in an emergency. One thyristor dual converter system (TDCS) manages the energy of two or three railway stations. If the TDCS fails, the trains stop operating. To solve the problem, this paper proposes the three parallel operation control algorithm of thyristor dual converter system using the emergency converter. The broken TDCS can be replaced by the emergency converter in other TDCS. The effectiveness of this proposed control is verified by simulation.

Redundant Operation of a Parallel AC to DC Converter via a Serial Communication Bus

  • Kanthaphayao, Yutthana;Kamnarn, Uthen;Chunkag, Viboon
    • Journal of Power Electronics
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    • v.11 no.4
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    • pp.533-541
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    • 2011
  • The redundant operation of a parallel AC to DC converter via a serial communication bus is presented. The proposed system consists of three isolated CUK power factor correction modules. The controller for each converter is a dsPIC30F6010 microcontroller while a RS485 communication bus and the clock signal are used for synchronizing the data communication. The control strategy of the redundant operation relies on the communication of information among each of the modules, which communicate via a RS485 serial bus. This information is received from the communication checks of the converter module connected to the system to share the load current. Performance evaluations were conducted through experimentation on a three-module parallel-connected prototype, with a 578W load and a -48V dc output voltage. The proposed system has achieved the following: the current sharing is quite good, both the transient response and the steady state. The converter modules can perform the current sharing immediately, when a fault is found in another converter module. In addition, the transient response occurs in the system, and the output voltages are at their minimum overshoot and undershoot. Finally, the proposed system has a relatively simple implementation for the redundant operation.

The Parallel Operation of ZVT-Full Bridge Converter with Dynamic Current Shared Inductor (동적 전류분담 인덕터를 적용한 ZVT 풀 브리지 컨버터의 병렬 운전)

  • Bae, Jin-Yong;Kim, Yong;Baek, Soo-Hyun;Kwon, Soon-Do;Lee, Kyu-Hoon;Kim, Cherl-Jin
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.942-945
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    • 2001
  • This paper presents parallel operation of ZVT(Zero Voltage Transition) Full Bridge Converter with Dynamic Current Shared Inductor. In the conventional method, CT(Current Transformer) have been used to share the load current equally with converters. In this system, at parallel operation of ZVT Full Bridge Converter, dynamic current shared inductor divides the same current of unit converter and ZVT circuit aids to high efficiency. This method which is proposed to compare in the conventional method will do simple control circuit. To show the superiority of this converter is verified through the experiment with a 2kW, 50kHz prototype converter.

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A Study on the Parallel Operation and Control Loop Design of ZVT-Full Bridge DC/DC Converter (ZVT 풀 브리지 DC/DC 컨버터의 병렬 운전 및 제어기 설계에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Yoon, Suk-Ho;Chang, Sung-Won;Lee, Kyu-Hoon
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.324-328
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    • 2001
  • This paper presents parallel operation and control loop design of ZVT(Zero Voltage Transition) Full Bridge DC/DC Converter. At parallel operation of ZVT Full Bridge Converter, dynamic current shared inductor devides the same current of unit converter and ZVT circuit and aids to high efficiency in the system. Base on the modeling of ZVT. Full Bridge Converter, the control loop is designed using a simple two-pole, one-zero compensation circuit. To show the validity of the design procedures, the small signal analysis of the closed loop system and open loop system is carried out and the superiority of the dynamic characteristics is verified through the experiment with a 2kW, 50kHz prototype converter.

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