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A Novel Phase Current Reconstruction Method for a Three-Level Neutral Point Clamped Inverter (NPCI) with a Neutral Shunt Resistor

Author

Listed:
  • Yungdeug Son

    (Department of Mechanical Facility Control Engineering, Korea University of Technology and Education; Cheonan, Chungnam 31253, Korea)

  • Jangmok Kim

    (Department of Electrical and Computer Engineering, Pusan National University, Busan 46241, Korea)

Abstract

This paper presents three phase current reconstruction methods for a three-level neutral point clamped inverter (NPCI) by measuring the voltage of a shunt resistor placed in the neutral point of the inverter. In order to accurately acquire the phase currents from the shunt resister, the dwell time of the active voltage vectors need to exceed the minimum time. On the other hand, if the time of active voltage is shorter than the minimum time, the current measurement becomes impossible. In this paper, unmeasurable regions for current are classified into three areas. Area 1 is a region in which both phase currents can be measure. Therefore, it is not necessary to restore the current. In Area 2, only one phase current can be measured. Thus, an estimation or restoration method is needed to measure another phase current. In this paper, the current estimation method using an electrical model of the motor is proposed. Area 3 is the region in which both phase currents can not be measured. In this case, it is necessary to move the voltage vector to the current measurable area by injecting the voltage. In this paper, Area 3 is divided into 36 sectors to inject optimal voltage. The proposed methods have the advantages of high current measurement accuracy and low THD (total harmonic distortion). The effectiveness of the proposed methods are verified through experimental results.

Suggested Citation

  • Yungdeug Son & Jangmok Kim, 2018. "A Novel Phase Current Reconstruction Method for a Three-Level Neutral Point Clamped Inverter (NPCI) with a Neutral Shunt Resistor," Energies, MDPI, vol. 11(10), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2616-:d:173161
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    Citations

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    Cited by:

    1. Guozheng Zhang & Bingxu Wei & Xin Gu & Xinmin Li & Zhanqing Zhou & Wei Chen, 2019. "Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction," Energies, MDPI, vol. 12(14), pages 1-16, July.
    2. Zheng Gong & Qi Cui & Xi Zheng & Peng Dai & Rongwu Zhu, 2018. "An Improved Imperialist Competitive Algorithm to Solve the Selected Harmonic Elimination Pulse-Width Modulation in Multilevel Converters," Energies, MDPI, vol. 11(11), pages 1-16, November.
    3. Fabio Viola, 2018. "Experimental Evaluation of the Performance of a Three-Phase Five-Level Cascaded H-Bridge Inverter by Means FPGA-Based Control Board for Grid Connected Applications," Energies, MDPI, vol. 11(12), pages 1-47, November.
    4. Maosong Zhang & Ying Cui & Qunjing Wang & Jun Tao & Xiuqin Wang & Hongsheng Zhao & Guoli Li, 2019. "A Study on Neutral-Point Potential in Three-Level NPC Converters," Energies, MDPI, vol. 12(17), pages 1-22, September.

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