NDLI: Combination voltage-controlled and current-controlled PWM inverters for parallel operation of UPS

Content Provider	IEEE Xplore Digital Library
Author	Jiann-FuhChen Ching-Lung Chu
Copyright Year	1993
Description	Author affiliation: Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan (Jiann-FuhChen; Ching-Lung Chu)
Abstract	In this paper the scheme of combination voltage-controlled and current-controlled PWM inverters for parallel operation of single-phase UPS is proposed. The voltage-controlled PWM inverter (VCPI) unit as a master is developed to keep a constant sinusoidal wave output voltage. The current-controlled PWM inverter (CCPI) units as a slave are controlled to track the distributive current. The power distribution center performs the function of distributing the output current of each active unit. In this proposed scheme of parallel operation, each of the units can be designed nearly independently, and the CCPI units do not need a PLL circuit for synchronization. As a result, the parallel operation of the UPS is easy to implement and to expand system capacity. For the purpose of illustration, the system, including three single-phase units which are operated in parallel, is analyzed and experimentally verified.
Starting Page	1111
Ending Page	1116
File Size	410880
Page Count	6
File Format	PDF
ISBN	0780308913
DOI	10.1109/IECON.1993.339119
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-11-15
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Pulse width modulation inverters Uninterruptible power systems Power generation Phase locked loops Frequency synchronization Equivalent circuits Pulse width modulation Power distribution Master-slave
Content Type	Text
Resource Type	Article

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