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NPC Seven-Level Single-Phase Inverter with DC-Link Voltage Balancing, Input Voltage Boosting, and AC Power Decoupling

Author

Listed:
  • Robert Stala

    (Department of Power Electronics and Energy Control Systems, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland)

  • Jakub Hachlowski

    (Department of Power Electronics and Energy Control Systems, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland)

  • Adam Penczek

    (Department of Power Electronics and Energy Control Systems, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland)

Abstract

This paper presents a novel concept of the DC-AC system with the input voltage boost ability, seven-level output voltage modulation, and the input AC current reduction at the double frequency of the output voltage. The system integrates the NPC full-bridge inverter which is composed of four-level legs and an active input voltage balancer (AIVB). The DC-link is composed of three capacitors connected in a series. The source of the energy is connected directly to the middle capacitor while the upper and lower capacitors of the DC-link are charged by the AIVB. The operation of the AIVB leads to balancing of the DC-link voltage and a three-fold boosting of the input voltage. The AIVB utilizes a novel switched-capacitor (SC) topology and can be designed as a low-volume quasi-magneticless converter with a simple open-loop control. One of the proposed methods of the control of the AIVB allows for a double frequency reduction in the input current. The application of the AIVB allows for the use of a seven-level NPC full-bridge (FB) inverter with a simple classic carrier-based PWM which is not applicable in the typical DC-link configurations. This paper presents the converter’s concept, its operation, control methods, and the results of simulations and experiments.

Suggested Citation

  • Robert Stala & Jakub Hachlowski & Adam Penczek, 2022. "NPC Seven-Level Single-Phase Inverter with DC-Link Voltage Balancing, Input Voltage Boosting, and AC Power Decoupling," Energies, MDPI, vol. 15(10), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3729-:d:819172
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    References listed on IDEAS

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    1. Singh, Jiwanjot & Dahiya, Ratna & Saini, Lalit Mohan, 2018. "Recent research on transformer based single DC source multilevel inverter: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3207-3224.
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