2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific) 2014
DOI: 10.1109/itec-ap.2014.6940808
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Abstract: This paper proposes a novel virtual impedance method for uninterruptible power system (UPS) inverters with parallel connected capability. To achieve wireless control, the droop control method is adopted. However, the power sharing accuracy is highly sensitive to the output impedance of inverter. So, a virtual output impedance is usually added to alleviate the unbalance of output impedance between each inverter and then, improve power sharing accuracy. The virtual impedance is implemented as the time derivative… Show more

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Cited by 7 publications
(9 citation statements)
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References 12 publications
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“…However, a conventional PQ control scheme has poor performance for non inductive loads [17,18]. Hence, strategies consisting of the conventional droop method with an additional virtual impedance loop have been proposed [19][20][21]. In independent control strategies, since the load voltage references are controlled to achieve load-sharing, a tradeoff between a precise load power distribution and a high-quality load voltage waveform typically exists.…”
Section: Introductionmentioning
confidence: 99%
“…However, a conventional PQ control scheme has poor performance for non inductive loads [17,18]. Hence, strategies consisting of the conventional droop method with an additional virtual impedance loop have been proposed [19][20][21]. In independent control strategies, since the load voltage references are controlled to achieve load-sharing, a tradeoff between a precise load power distribution and a high-quality load voltage waveform typically exists.…”
Section: Introductionmentioning
confidence: 99%