• Title, Summary, Keyword: Diode clamped multi-level converter

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An Optimization Design of the Diode Clamped Multi-Level Converter for Coaxial Inductive Power Transfer on the Low Voltage DC Micro-grid

  • Pairindra, Worapong;Khomfoi, Surin
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.333-344
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    • 2018
  • This proposed paper aims for the high efficiency contactless power transfer in household dc power distribution. A 300 W five-level diode clamped multi-level converter with 300 Vdc input dc link bus is employed for the power transferring task and the output voltage range is controlled at 48 Vdc. The inner and outer solenoid coils are used for inductive power transfer (IPT) transformer with the 200 kHz switching frequency for designed power density. Therefore, to achieve the converter efficiency above 95%, the LLC series resonant with fundamental harmonic analysis (FHA) and the calculated switching angles are used as an optimized tool for designing the system resonant tank. The validations of this approached topology are illustrated in both MATLAB/Simulink simulation and implementation.

Overvoltage Snubber for a Diode-Clamped 3-level IGBT Inverter (다이오드 클램프형 3-레벨 IGBT 인버터용 과전압 방지 스너버)

  • Jung, Jae-Hun;Song, Woong-Hyub;Nho, Eui-Cheol;Kim, In-Dong;Kim, Heung-Geun;Chun, Tae-Won;Yoo, Dong-Wook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.6
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    • pp.514-521
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    • 2009
  • This paper deals with a new overvoltage snubber for a diode-clamped 3-level IGBT inverter. Usually most power converters use snubber circuits to protect the switching devices from voltage spike. However, it is difficult for the diode-clamped multi-level converter to be protected from voltage spike with overvoltage snubber since the series connection of the switching devices. To solve the problem the characteristic of a overvoltage snubber for a DC-DC converter is analyzed, and a new snubber for a diode clamped 3-level inverter is proposed. The performance of the proposed snubber is verified through experiments.

Wind Energy Interface to Grid with Load Compensation by Diode Clamped Multilevel Inverters

  • Samuel, Paulson;Naik, M. Kishore;Gupta, Rajesh;Chandra, Dinesh
    • Journal of Power Electronics
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    • v.14 no.2
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    • pp.271-281
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    • 2014
  • Fluctuating wind conditions necessitate the use of a variable speed wind turbine (VSWT) with a AC/DC/AC converter scheme in order to harvest the maximum power from the wind and to decouple the synchronous generator voltage and frequency from the grid voltage and frequency. In this paper, a combination of a three phase diode bridge rectifier (DBR) and a modified topology of the diode clamped multilevel inverter (DCMLI) has been considered as an AC/DC/AC converter. A control strategy has been proposed for the DCMLI to achieve the objective of grid interface of a wind power system together with local load compensation. A novel fixed frequency current control method is proposed for the DCMLI based on the level shifted multi carrier PWM for achieving the required control objectives with equal and uniform switching frequency operation for better control and thermal management with the modified DCMLI. The condition of the controller gain is derived to ensure the operation of the DCMLI at the fixed frequency of the carrier. The converter current injected into the distribution grid is controlled in accordance with the wind power availability. In addition, load compensation is performed as an added facility in order to free the source currents being fed from the grid of harmonic distortion, unbalance and a low power factor even though the load may be unbalanced, non-linear and of a poor power factor. The results are validated using PSCAD/EMTDC simulation studies.