NDLI: An Improved Parallel Processing UPS Using a Voltage-Controlled Voltage Source Inverter

Content Provider	IEEE Xplore Digital Library
Author	Lee, S.W. Dehbonei, H. Ko, S.H. Lee, S.R. Jang, B.H. Moon, Y.H. Ko, T.K.
Copyright Year	2007
Description	Author affiliation: Inst. of TMS Inf. Tech., Seoul (Lee, S.W.)
Abstract	This paper presents an improved parallel processing uninterruptible power supply (UPS) for a strong grid using a bi-directional voltage-controlled voltage source inverter (VCVSI). To maintain the load voltage at the desired value and to control the active power flow between the VCVSI and grid, the amplitude and phase angle of the inverter output voltage (power angle) must be controlled. Selecting the power angle operating range is an important factor which has a direct effect on various parameters, such as the size of a decoupling inductor, grid power factor and the power ratings of VCVSI components. It is shown how the optimum power angles can be chosen and by restricting the operation of this, the power factor can be maintained above 0.9 at different loads and operating conditions. The paper examines the steady state modeling and analysis of a single phase parallel processing UPS while maintaining a high system power factor under different conditions. Experimental and simulation results of a prototyped 1 KVA VCVSI confirms the validity of the proposed method.
Starting Page	1508
Ending Page	1512
File Size	8179134
Page Count	5
File Format	PDF
ISBN	9781424406449
DOI	10.1109/PEDS.2007.4487905
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-27
Publisher Place	Thailand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Parallel processing Uninterruptible power systems Inverters Reactive power Voltage control Bidirectional control Load flow Inductors Steady-state Power system modeling power factor Parallel processing UPS power angle VCVSI
Content Type	Text
Resource Type	Article

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