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An Improved SPWM-Based Control with Over-Modulation Strategy of the Third Harmonic Elimination for a Single-Phase Inverter

Author

Listed:
  • Alenka Hren

    (Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, SI-2000 Maribor, Slovenia
    These authors contributed equally to this work.)

  • Franc Mihalič

    (Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, SI-2000 Maribor, Slovenia
    These authors contributed equally to this work.)

Abstract

In single-phase inverter systems (grid-connected, Uninterrupted Power Supply systems or motor drives), the high quality Total Harmonic Distortion (THD) factor must always be considered, along with the utilization rate of the DC link. In cases when the supplying DC voltage is reduced, the output voltage can still be assured constant in a limited range by using over-modulation. Unfortunately, this operation incurs fundamental frequency related higher order harmonics’ force (especially the third is dominant) into the inverter output voltage, which is a huge drawback in almost all applications. This paper provides a comprehensive spectrum analysis of three-level output voltage in a single-phase inverter working in over-modulation regime. The output voltage is generated by triangular Sinusoidal Pulse-Width Modulation (SPWM) and, based on the analytical results of a frequency spectrum evaluation, the opposite third harmonic component in the modulator unit forces this component in the output voltage close to zero. Other remaining higher harmonics can be attenuated more easily by using a smaller filter. Although the voltage gain of the fundamental harmonic component is lower at higher over-modulation, such a solution assures lower THD in the wide inverter’s working range. The proposed SPWM procedure was validated experimentally.

Suggested Citation

  • Alenka Hren & Franc Mihalič, 2018. "An Improved SPWM-Based Control with Over-Modulation Strategy of the Third Harmonic Elimination for a Single-Phase Inverter," Energies, MDPI, vol. 11(4), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:881-:d:140384
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    References listed on IDEAS

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    1. Ou, Ting-Chia & Hong, Chih-Ming, 2014. "Dynamic operation and control of microgrid hybrid power systems," Energy, Elsevier, vol. 66(C), pages 314-323.
    2. Ting-Chia Ou & Kai-Hung Lu & Chiou-Jye Huang, 2017. "Improvement of Transient Stability in a Hybrid Power Multi-System Using a Designed NIDC (Novel Intelligent Damping Controller)," Energies, MDPI, vol. 10(4), pages 1-16, April.
    3. Mohammed Al-Hitmi & Salman Ahmad & Atif Iqbal & Sanjeevikumar Padmanaban & Imtiaz Ashraf, 2018. "Selective Harmonic Elimination in a Wide Modulation Range Using Modified Newton–Raphson and Pattern Generation Methods for a Multilevel Inverter," Energies, MDPI, vol. 11(2), pages 1-16, February.
    4. Jana, Joydip & Saha, Hiranmay & Das Bhattacharya, Konika, 2017. "A review of inverter topologies for single-phase grid-connected photovoltaic systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 72(C), pages 1256-1270.
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    Cited by:

    1. Cheng Nie & Yue Wang & Wanjun Lei & Tian Li & Shiyuan Yin, 2018. "Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping," Energies, MDPI, vol. 11(10), pages 1-15, September.
    2. Min-Sup Song & In-Ho Cho & Jae-Bum Lee, 2020. "± 180° Discontinuous PWM for Single-Phase PWM Converter of High-Speed Railway Propulsion System," Energies, MDPI, vol. 13(7), pages 1-16, March.
    3. Marcolino Díaz-Araujo & Aurelio Medina & Rafael Cisneros-Magaña & Amner Ramírez, 2018. "Periodic Steady State Assessment of Microgrids with Photovoltaic Generation Using Limit Cycle Extrapolation and Cubic Splines," Energies, MDPI, vol. 11(8), pages 1-16, August.

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