NDLI: Low THD, fast transient, and cost-effective synchronous-frame repetitive controller for three-phase UPS inverters

Content Provider	IEEE Xplore Digital Library
Author	Shuai Jiang Dong Cao Peng, F.Z. Yuan Li Jianfeng Liu
Copyright Year	2011
Description	Author affiliation: Department of Electrical and Computer Engineering, Michigan State University, East Lansing, USA (Shuai Jiang; Dong Cao; Peng, F.Z.) \|\| School of Information Science and Engineering, Central South University, Changsha, China (Jianfeng Liu) \|\| Department of Electrical Engineering and Information, Sichuan University, Chengdu, China (Yuan Li)
Abstract	This paper presents a synchronous-frame repetitive controller for three-phase UPS inverters. The proposed control algorithm can eliminate odd-harmonic periodic distortions caused by the nonlinear and unbalanced load, and simultaneously achieve very fast transient response. Distinguished from the conventional repetitive control in the stationary frame, the proposed approach incorporates the repetitive controller into three deliberately selected synchronous frames. Resultantly, the repetitive control time delay is reduced to 1/6 of the fundamental period such that the error convergence rate and transient tracking accuracy are both significantly improved. To further enhance the steadystate performance, a high performance $4^{th}-order$ linear-phase infinite-impulse-response (IIR) filter Q(z) is synthesized and incorporated into the repetitive controller. The proposed controller is implemented on the Texas Instruments fixed-point digital signal processor (TMS320LF2407) and eliminates all current sensors for cost effectiveness. Experiments have been carried out on an 18 kW three-phase UPS prototype. Low THD (<2%) has been achieved under heavily distorted nonlinear load and unbalanced load. Fast error convergence (< one fundamental period) is demonstrated during step load transients.
Starting Page	2819
Ending Page	2826
File Size	506582
Page Count	8
File Format	PDF
ISBN	9781457705427
e-ISBN	9781457705410
DOI	10.1109/ECCE.2011.6064148
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	IIR filters Harmonic analysis Inverters Steady-state Power harmonic filters Uninterruptible power systems Convergence
Content Type	Text
Resource Type	Article

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