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. 2024 Nov 16;14(1):28269.
doi: 10.1038/s41598-024-79891-1.

Low capacitor stress reconfigurable quadratic boost converter with fault tolerant capability for rooftop solar PV application

J Divya Navamani  1 , K Boopathi  2 , A Lavanya  3 , Pradeep Vishnuram  3 , Mohit Bajaj  4   5   6 , Ievgen Zaitsev  7   8
Affiliations

Low capacitor stress reconfigurable quadratic boost converter with fault tolerant capability for rooftop solar PV application

J Divya Navamani et al. Sci Rep. .

Abstract

Recently, many high-gain topologies have been derived. However, there is a need for a high-gain converter with fault-tolerant features. In this paper, a fault-tolerant reconfigurable quadratic boost converter is proposed for DC microgrid application. In this novel topology, 2-level redundancy is achieved by addressing the fault in the switch and capacitors. The operation of the converter in normal operating conditions and reconfiguration mode is discussed. The derived topology can achieve the same voltage gain even in the reconfiguration mode. The proposed topology exhibits better performance in the reconfiguration state. The voltage stress across the input and output capacitor is reduced in that state. The reliability analysis of capacitors in both states is carried out and compared with the aid of the reliability handbook. Finally, the topology operation in a normal and reconfiguration state is validated by building a 1-kW hardware setup. The results show that the quadratic boost converter in a reconfiguration state operates without altering the voltage gain of the converter and with reduced voltage stress across the capacitors.

Keywords: Capacitor; Fault-tolerant; Quadratic and reliability; Reconfiguration; Switch.

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Conflict of interest statement

Declarations Competing interests The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
(a) Cost of solar panel and its production (b) Failures in power converter.
Fig. 2
Fig. 2
(a) Derivation of the proposed structure (b) Reconfigured Fault-tolerant Quadratic boost converter (RFTQB) (c) RFTQB converter with faulted components considered for analysis (d) RFTQB converter in normal state (e) RFTQB converter in reconfiguration state.
Fig. 3
Fig. 3
Circuit configuration (a) Input capacitor fails (b) Output capacitor fails (c) Switch fails.
Fig. 4
Fig. 4
(a) Voltage across diodes and capacitors in Normal state (b) Voltage across diodes and capacitors in reconfiguration state (c) Switching flow graph of proposed fault-tolerant converter in normal mode (d) Switching flow graph of proposed fault-tolerant converter in reconfiguration mode (e) Root locus (f) Bode plot (g) Changes in voltage gain for various value of duty cycle and parasitic resistance (h) Losses in the power components.
Fig. 5
Fig. 5
Reliability assessment (a) Voltage stress across input capacitor (b) Voltage stress across output capacitor (c) Base failure rate of input capacitor (d) Base failure rate of output capacitor (e) Comparison of base failure rate of capacitors for chosen ratings (f) Comparison of failure rate of capacitors for chosen ratings (g) Failure rate analysis of switch (h) Failure rate analysis of diode (i) Failure rate analysis of inductor (j) Failure rate analysis of capacitor.
Fig. 6
Fig. 6
Comparative analysis (a) Converter proposed in (b) Converter proposed in (c) RFTQB topology.
Fig. 7
Fig. 7
Simulation results (a) Output voltage (b) capacitor voltage (c) Switch voltage (d) Diode voltage (e) Input and output voltage/current.
Fig. 8
Fig. 8
Hardware results (a) Photograph of 1-kW proposed converter in Ilem sheet (b) Photograph of proposed converter as a finished product with protection circuit (c) Photograph of test setup with solar panel and resistive load (d) Photograph of the solar panel (e) Input/output voltage and output capacitor voltage at 0.5 duty cycle (f) Input/output voltage and output capacitor voltage at 0.4 duty cycle (g) Diode voltages (h) SW and SWR voltage (i) Voltage across capacitor Co and CoR (j) Voltage across C and CR (k) Input current for 0.5 duty cycle with output/input voltage (l) Redundant capacitors (CR and CoR) current with input and output voltage.
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References

    1. Kesavan, P. K., Subramaniam, U., Almakhles, D. J. & Selvam, S. Modelling and coordinated control of grid connected photovoltaic, wind turbine driven PMSG, and energy storage device for a hybrid DC/AC microgrid. Protect. Control Modern Power Syst.9 (1), 154–167. 10.23919/PCMP.2023.000272 (2024).
    1. Saafan, A. A., Khadkikar, V., Edpuganti, A., Moursi, M. S. E. & Zeineldin, H. H. A novel nonisolated four-port converter for flexible DC microgrid operation. IEEE Trans. Ind. Electron.71 (2), 1653–1664. 10.1109/TIE.2023.3257360 (2024).
    1. Wan, K., Zhao, J., Chen, Y. & Yu, M. A decentralized resilient control scheme for DC microgrids against faults on sensor and actuator. IEEE Trans. Circuits Syst. I Regul. Pap.71 (2), 816–827. 10.1109/TCSI.2023.3331881 (2024).
    1. Bhakar, P. S. & Kalaiselvi, J. Fault-tolerant and self-reliant characteristic in series resonant converter for semiconductor open/short-circuit faults. IEEE J. Emerg. Selected Top. Power Electron.11 (1), 1143–1153. 10.1109/JESTPE.2022.3161362 (2023).
    1. Mahafzah, K. A., Al-Shetwi, A. Q., Hannan, M. A., Babu, T. S. & Nwulu, N. A new Cuk-based DC-DC converter with improved efficiency and lower rated voltage of coupling capacitor. Sustainability15 (11), 8515 (2023).

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