DocumentCode :
737980
Title :
A Control Strategy for Parallel Operation of Single-Phase Voltage Source Inverters: Analysis, Design and Experimental Results
Author :
Lazzarin, Telles B. ; Bauer, G.A.T. ; Barbi, Ivo
Author_Institution :
Dept. of the Electr. Eng. (EEL), Fed. Univ. of Santa Catarina (UFSC), Florianopolis, Brazil
Volume :
60
Issue :
6
fYear :
2013
fDate :
6/1/2013 12:00:00 AM
Firstpage :
2194
Lastpage :
2204
Abstract :
This paper describes a theoretical and experimental study on a control strategy for the parallel operation of single-phase voltage source inverters (VSI), to be applied to uninterruptible power supply. The control system for each inverter consists of two main loops, which both use instantaneous values. The first (parallelism control) employs the feedback of the inductor current from the output filter to modify the input voltage of the same filter and, therefore, to control the power flow of each inverter to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltage of the LC filter, which coincides with the output voltage of the VSI. Due to the fact that there is no exchange of information among the VSIs regarding their operation points, it is easier to obtain redundant systems. Furthermore, the connection (or disconnection) of inverters in a parallel arrangement is carried out directly, without connection impedance, and can occur at any operation point of the system. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state operation. Moreover, its design and implementation are very simple. The control technique was verified through experimental results with a maximum load of 10 kVA supplied by three parallel-connected inverters.
Keywords :
feedback; invertors; load flow control; uninterruptible power supplies; voltage control; LC filter; inductor current; parallel connected inverters; parallelism control; power flow control; single phase voltage source inverters; steady-state operation; transient operation; uninterruptible power supply; voltage control; Control systems; Inductors; Inverters; Parallel processing; Pulse width modulation; Transfer functions; Voltage control; Control strategy; parallelism; single-phase; uninterruptible power supply (UPS); voltage source inverters (VSIs);
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2012.2193856
Filename :
6179531
Link To Document :
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