NDLI: Closed-loop SPWM control for grid-connected buck-boost inverters

Content Provider	IEEE Xplore Digital Library
Author	Yaosuo Xue Liuchen Chang
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Comput. Eng., New Brunswick Univ., Fredericton, NB, Canada (Yaosuo Xue; Liuchen Chang)
Abstract	DC input voltage of inverters fluctuates dramatically in distributed generation applications such as in a wind energy system. Yet, a high quality AC output is required for grid interconnection under variable source conditions. Previously developed control strategies mainly focused on improvements under load variations, a DC input of relatively small ripples, etc. This paper proposed a closed-loop sinusoidal PWM control method with real-time waveform feedback techniques for a grid-connected buck-boost inverter. The control-to-output function was derived through steady state modeling based on the power balance condition, which provides an approach when the output cannot easily be characterized in a single-stage buck-boost inverter. The closed-loop control model was studied with a newly-invented single-stage buck-boost inverter circuit. Simulations verified the method provided fast dynamic response and robustness under large DC voltage variations, nonideal grid voltage, and component parametric uncertainties. The controlled inverter achieved a low-THD sinusoidal output with a small AC filter and without a DC link capacitor. Therefore, it is concluded that the proposed method can be a preferred choice for grid-connected buck-boost inverters in distributed generation systems.
Sponsorship	IEEE Power Electon. Soc
Starting Page	3366
Ending Page	3371
File Size	374845
Page Count	6
File Format	PDF
ISBN	0780383990
ISSN	02759306
DOI	10.1109/PESC.2004.1355070
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-20
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation inverters Distributed control Voltage fluctuations Wind energy Integrated circuit interconnections Load management Feedback Steady-state Circuit simulation Robustness
Content Type	Text
Resource Type	Article

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