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Simple Discrete Control of a Single-Phase Voltage Source Inverter in a UPS System for Low Switching Frequency

Author

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  • Zbigniew Rymarski

    (Department of Electronics, Electrical Engineering and Microelectronics, Faculty of Automatic Control, Electronics and Computer Science, Silesian University of Technology, Akademicka 16, 44-100 Gliwice, Poland)

Abstract

Previous research has shown that the inverter output voltage distortions are higher for low switching frequencies, and it is impossible to increase the controller gains because it will cause oscillations of the output voltage. The main reason is the real frequency domain characteristic of the PWM modulator and measuring traces, which can be modelled as switching periods delays. The thesis of this paper is that by using the control system that takes care of these delays, it is possible to decrease output voltage distortions for the standard loads for relatively low switching frequencies (e.g., 12,800 Hz). The Luenberger observer was implemented in the multi-input-multi-output passivity-based control of the system with the delay, in order to predict the state variables of the inverter. It is shown that state variable prediction is unnecessary for high switching frequencies (e.g., 51,200 Hz). The theory, simulations and breadboard verification, using the inverter model controlled with the real-time interface MicroLabBox, are presented.

Suggested Citation

  • Zbigniew Rymarski, 2023. "Simple Discrete Control of a Single-Phase Voltage Source Inverter in a UPS System for Low Switching Frequency," Energies, MDPI, vol. 16(15), pages 1-26, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5717-:d:1207229
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    References listed on IDEAS

    as
    1. Zbigniew Rymarski & Krzysztof Bernacki, 2021. "Technical Limits of Passivity-Based Control Gains for a Single-Phase Voltage Source Inverter," Energies, MDPI, vol. 14(15), pages 1-19, July.
    2. Zbigniew Rymarski & Krzysztof Bernacki, 2020. "Different Features of Control Systems for Single-Phase Voltage Source Inverters," Energies, MDPI, vol. 13(16), pages 1-20, August.
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