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A new modeling and control scheme for cascaded split-source converter cells

Montazeri, S. H ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1109/TIE.2021.3111559
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2022
  4. Abstract:
  5. Cascaded split-source inverter (CSSI) is a new single-stage modular multilevel topology. Each cell of this converter converts dc to ac power in the buck or boost operation mode without any additional power switch. This article develops a design method based on a detailed model for CSSI. This model shows that energy storage elements experience double-fundamental frequency ripples besides high-frequency ones. It accurately calculates voltage gains and capacitor voltage and inductor current ripples. On the other hand, common carrier-based multilevel modulations have been modified in terms of both reference and carrier signals to control the inverter under symmetric and asymmetric conditions. With proposed simple modulations, the cell inductor is charged with the constant duty cycle. Also, the reverse recovery of diodes occurs in the minimum level of input current once per switching cycle and output power is distributed equally between cells. These characteristics reduce power losses, the input inductance of each cell, and the complexity of the system model. By phase-shifted pulsewidth modulation (PWM), the output voltage harmonics of three-cell CSSI are centralized around multiples of the triple switching frequency. In this method, high-frequency ripples on the network impedance are one-third of those in level-shifted PWM. Also, CSSI has been compared with cascaded multilevel inverters with voltage boosting ability and other SSI-based multilevel topologies. Validity of operation principles, mathematical relations, and modulation schemes are verified through simulation and experimental results. © 1982-2012 IEEE
  6. Keywords:
  7. Buck-boost inverter ; Carrier signal ; Low-frequency ripple ; Multilevel inverter ; Split-source inverter (SSI) ; Cells ; Cytology ; Energy storage ; Molecular biology ; Pulse width modulation ; Switching frequency ; Voltage control ; Asymmetric condition ; Fundamental frequencies ; High frequency ripple ; Inductor current ripples ; Modeling and control ; Multilevel modulation ; Multilevel topologies ; Phase shifted pulse ; Electric inverters
  8. Source: IEEE Transactions on Industrial Electronics ; Volume 69, Issue 8 , 2022 , Pages 7618-7628 ; 02780046 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/9539031