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Current Sensorless Pole-Zero Cancellation Output Voltage Control for Uninterruptible Power Supply Systems with a Three-Phase Inverter

Author

Listed:
  • Hosik Lee

    (Green Mobility Team, Tenergy, Suwon 18487, Republic of Korea)

  • Yonghun Kim

    (School of Mechanical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea)

  • Seok-Kyoon Kim

    (Department of Creative Convergence Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)

Abstract

This article presents a proportional–derivative (PD) type output voltage regulator without the current feedback, taking into account system parameter and load variations. The main advantages are given as follows: First, the first-order output voltage derivative observer is developed without the requirement of system parameter information, which makes it possible to stabilize the system without current sensing. Second, a simple self-tuner implements the feedback-loop adaptation by updating the desired dynamics accordingly. Third, the observer-based active damping injection for the PD-type controller results in the closed-loop system order reduction to 1 by the pole-zero cancellation, including the disturbance observer as a feed-forward term. The prototype uninterruptible power supply system comprised of a 3 kW three-phase inverter, inductors, and capacitors verifies the practical merits of the proposed technique for linear and nonlinear loads.

Suggested Citation

  • Hosik Lee & Yonghun Kim & Seok-Kyoon Kim, 2024. "Current Sensorless Pole-Zero Cancellation Output Voltage Control for Uninterruptible Power Supply Systems with a Three-Phase Inverter," Energies, MDPI, vol. 17(7), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1738-:d:1370272
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    References listed on IDEAS

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    1. Zhaoxu Luo & Bo Zhang & Lang Li & Lixing Tang, 2023. "A Decentralized Control Strategy for Series-Connected Single-Phase Two-Stage Photovoltaic Grid-Connected Inverters," Energies, MDPI, vol. 16(20), pages 1-13, October.
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