A novel high-performance voltage regulator for single-phase ACsources
Han-Woong Park; Sung-Jun Park; Jin-Gil Park; Cheul-U Kim
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 3, Jun 2001 Page(s):554 - 562
Digital Object Identifier 10.1109/41.925582
Summary:Regulation of load voltage in single-phase applications is
becoming an important issue for critical loads. This paper presents a
novel high-performance single-phase voltage regulator which has a common
arm between the rectifier and inverter, and adopts an appropriate
switching strategy. The proposed voltage regulator employs six switches
and can be implemented by only one three-phase inverter module. The
proposed voltage regulator has the capability of delivering sinusoidal
input current with unity power factor, good output voltage regulation,
and bidirectional power flow. For these purposes, a fully digital
controller is designed and implemented using a TMS320F240 digital signal
processor. In addition, a novel low-cost AC capacitor is also presented.
This type of capacitor requires two DC capacitors and two diodes,
enabling low-cost and compact manufacturing. Consequently, the complete
voltage regulator system, which is mainly suitable for an
uninterruptible power supply as well as reactive or nonlinear loads, can
be constructed compactly and inexpensively. Experimental results are
presented to verify the feasibility of the proposed voltage regulator
system
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