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A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

Author

Listed:
  • Turgay Duman

    (Department of Electrical and Computer Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA)

  • Shilpa Marti

    (Department of Electrical and Computer Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA)

  • M. A. Moonem

    (Department of Electrical and Computer Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA)

  • Azas Ahmed Rifath Abdul Kader

    (Department of Electrical and Computer Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA)

  • Hariharan Krishnaswami

    (Department of Electrical and Computer Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA)

Abstract

A modular multilevel power converter configuration for grid connected photovoltaic (PV) systems is proposed. The converter configuration replaces the conventional bulky line frequency transformer with several high frequency transformers, potentially reducing the balance of systems cost of PV systems. The front-end converter for each port is a neutral-point diode clamped (NPC) multi-level dc-dc dual-active bridge (ML-DAB) which allows maximum power point tracking (MPPT). The integrated high frequency transformer provides the galvanic isolation between the PV and grid side and also steps up the low dc voltage from PV source. Following the ML-DAB stage, in each port, is a NPC inverter. N number of NPC inverters’ outputs are cascaded to attain the per-phase line-to-neutral voltage to connect directly to the distribution grid (i.e., 13.8 kV). The cascaded NPC (CNPC) inverters have the inherent advantage of using lower rated devices, smaller filters and low total harmonic distortion required for PV grid interconnection. The proposed converter system is modular, scalable, and serviceable with zero downtime with lower foot print and lower overall cost. A novel voltage balance control at each module based on power mismatch among N -ports, have been presented and verified in simulation. Analysis and simulation results are presented for the N -port converter. The converter performance has also been verified on a hardware prototype.

Suggested Citation

  • Turgay Duman & Shilpa Marti & M. A. Moonem & Azas Ahmed Rifath Abdul Kader & Hariharan Krishnaswami, 2017. "A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems," Energies, MDPI, vol. 10(5), pages 1-28, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:698-:d:98863
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    Citations

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    Cited by:

    1. Simone Fiori & Jing Wang, 2023. "External Identification of a Reciprocal Lossy Multiport Circuit under Measurement Uncertainties by Riemannian Gradient Descent," Energies, MDPI, vol. 16(6), pages 1-31, March.
    2. Jiatu Hong & Mahinda Vilathgamuwa & Jian Yin & Yitao Liu & Jianchun Peng & Hui Jiang, 2018. "Power Decoupling of a Single Phase DC-AC Dual Active Bridge Converter Based on an Integrated Bidirectional Buck/Boost Stage," Energies, MDPI, vol. 11(10), pages 1-16, October.
    3. Marian Liberos & Raúl González-Medina & Gabriel Garcerá & Emilio Figueres, 2017. "Modelling and Control of Parallel-Connected Transformerless Inverters for Large Photovoltaic Farms," Energies, MDPI, vol. 10(8), pages 1-25, August.
    4. Refaat, Ahmed & Osman, Mohamed Hassan & Korovkin, Nikolay V., 2020. "Current collector optimizer topology to extract maximum power from non-uniform aged PV array," Energy, Elsevier, vol. 195(C).
    5. Xuesong Zhou & Jiayao Wang & Youjie Ma, 2020. "Linear Active Disturbance Rejection Control of Grid-Connected Photovoltaic Inverter Based on Deviation Control Principle," Energies, MDPI, vol. 13(15), pages 1-29, July.
    6. Lei Wang & Qinghua Wu & Wenhu Tang, 2017. "Energy Balance Control of a Cascaded Multilevel Inverter for Standalone Solar Photovoltaic Applications," Energies, MDPI, vol. 10(11), pages 1-17, November.
    7. Narciso Castro Charris & Vladimir Sousa Santos & Juan Jos Cabello Eras, 2023. "Aspects to Consider in the Evaluation of Photovoltaic System Projects to Avoid Problems in Power Systems and Electric Motors," International Journal of Energy Economics and Policy, Econjournals, vol. 13(3), pages 334-341, May.
    8. Haris Ataullah & Taosif Iqbal & Ihsan Ullah Khalil & Usman Ali & Vojtech Blazek & Lukas Prokop & Nasim Ullah, 2022. "Analysis of the Dual Active Bridge-Based DC-DC Converter Topologies, High-Frequency Transformer, and Control Techniques," Energies, MDPI, vol. 15(23), pages 1-23, November.
    9. Xuesong Zhou & Mao Liu & Youjie Ma & Bao Yang & Faqing Zhao, 2019. "Linear Active Disturbance Rejection Control for DC Bus Voltage of Permanent Magnet Synchronous Generator Based on Total Disturbance Differential," Energies, MDPI, vol. 12(20), pages 1-22, October.

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