Enhanced Circular Chain Control for Parallel Operation of Inverters in UPS Systems

Mahdi Shahparasti, Mehdi Savaghebi, Majid Hosseinpour and Navid Rasekh
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Mahdi Shahparasti: Electrical Engineering Section, Department of Mechanical and Electrical Engineering, University of Southern Denmark, 5230 Odense, Denmark
Mehdi Savaghebi: Electrical Engineering Section, Department of Mechanical and Electrical Engineering, University of Southern Denmark, 5230 Odense, Denmark
Majid Hosseinpour: Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil 56199-13131, Iran
Navid Rasekh: Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil 56199-13131, Iran

Sustainability, 2020, vol. 12, issue 19, 1-16

Abstract: In this paper, a current sharing method based on the circular chain control (3C) method is proposed for controlling parallel inverters of unequal ratings in uninterruptible power supply (UPS) applications. Due to its circular structure, 3C is one of the most convenient methods which can be used in UPS as well as microgrid systems. However, the conventional 3C control strategy is only applicable to inverters of equal power ratings. The proposed method not only retains the circular structure of the 3C method, but also provides adaptability for the parallel operation of inverters with different power ratings. Moreover, this method adds hot-swap capability to the parallel inverter. A two-loop control structure is used to control the inverters. For proper current sharing, currents of inverters are conveyed in a circular structure with appropriate gains through control links. Simulation and experimental results for linear and nonlinear loads verify the effectiveness of the proposed strategy.

Keywords: parallel inverters; current sharing; circular chain control (3C) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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