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Digital control of a three-phase series-parallel uninterruptible power supply/active filter system | IEEE Conference Publication | IEEE Xplore

Digital control of a three-phase series-parallel uninterruptible power supply/active filter system


Abstract:

In this paper, a new digital deadbeat controller is designed, implemented, and applied to a three-phase series-parallel line-interactive uninterruptible power supply (UPS...Show More

Abstract:

In this paper, a new digital deadbeat controller is designed, implemented, and applied to a three-phase series-parallel line-interactive uninterruptible power supply (UPS). This topology consists of a parallel and a series converter. In this topology, most of the power is supplied directly from the AC line to the load. Therefore, the overall efficiency is higher than that of the on-line UPS. The controller adjusts the current of the parallel converter and voltage of the series converter and follows the reference with two and four sampling periods, respectively. Current and voltage control of the system in different operating modes are discussed. Simulation and experimental results are presented, which show the viability of the proposed controller for this topology.
Date of Conference: 20-25 June 2004
Date Added to IEEE Xplore: 15 November 2004
Print ISBN:0-7803-8399-0
Print ISSN: 0275-9306
Conference Location: Aachen, Germany

I. Introduction

The main types of the static UPS systems are on-line, off-line, and line-interactive configurations. The main advantages of off-line UPS topology are simple design, low cost, and small size. The line conditioning is passive and, hence, the technique is very robust. On the other hand, no output voltage regulation, long switching time, and poor performance with nonlinear loads are the main disadvantages of this topology. Although, the on-line UPS system is widely recognized as the superior topology in performance, power conditioning, and load protection, the low efficiency is inherent to this topology due to the double-conversion nature of this UPS. Power flow through the rectifier and inverter during the normal operation means higher power losses and lower efficiency compared to off-line and line-interactive UPS systems.

References

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