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

Hosik Lee, Yonghun Kim () and Seok-Kyoon Kim ()
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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

Energies, 2024, vol. 17, issue 7, 1-18

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.

Keywords: uninterruptible power supply; voltage control; observer; active damping; pole-zero cancellation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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