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Open AccessArticle

A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique

1
Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
2
Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju 27469, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Akhtar Kalam
Energies 2017, 10(5), 673; https://doi.org/10.3390/en10050673
Received: 10 March 2017 / Revised: 20 April 2017 / Accepted: 5 May 2017 / Published: 11 May 2017
(This article belongs to the Section Electrical Power and Energy System)
This paper proposes a single-loop repetitive voltage control strategy which incorporates the active damping control feature for single-phase uninterruptible power supply (UPS) applications. The proposed method reduces the effect of the LC resonant peak, which limits the control bandwidth and deteriorates the stability of the entire control loop by effectively increasing the damping component. Due to the increased stability margin, a repetitive controller working together with a proportional-resonant (PR) controller can be easily adopted. Moreover, the voltage error is minimized even under severe non-linear load conditions. It is confirmed that the proposed single-loop controller achieves excellent and stable voltage regulation performance by evaluating the entire loop-gain of the system and the output impedance. Both the simulation and the experimental results for a 1.5 kW UPS inverter show agree well with the analyses, and the excellence of the proposed method has been verified. View Full-Text
Keywords: uninterruptible power supply (UPS); repetitive voltage control; active damping uninterruptible power supply (UPS); repetitive voltage control; active damping
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Cho, Y.; Byen, B.-J.; Lee, H.-S.; Cho, K.-Y. A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique. Energies 2017, 10, 673.

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