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Title: A simple control method for high-performance UPS inverters through output-impedance reduction
Authors: Deng, H.
Oruganti, R. 
Srinivasan, D. 
Keywords: Digital control
Pulse-width-modulation (PWM) inverter
Uninterruptible power supply (UPS)
Issue Date: Feb-2008
Citation: Deng, H., Oruganti, R., Srinivasan, D. (2008-02). A simple control method for high-performance UPS inverters through output-impedance reduction. IEEE Transactions on Industrial Electronics 55 (2) : 888-898. ScholarBank@NUS Repository.
Abstract: The purpose of a voltage controller for uninterruptible-power-supply inverters is to produce stable output voltage with low distortion under all loading conditions, particularly under nonlinear loads and load transients. Since the output impedance of the inverter is the source for tracking error caused by load current, this paper proposes a simple digital feedback controller that focuses on reducing the output impedance of inverters by a feedback of the load current. The proposed control strategy ensures high-quality steady-state and dynamic responses from the inverter system. The design of the proposed digital controller is simple and requires only a reasonably accurate knowledge of the output L - C filter parameters. In addition, only the output voltage and the load current are sensed if the dc link voltage is constant. The results of simulations and experiments show that the proposed controller can achieve very low total harmonic distortion and fast dynamic response under varied loads including nonlinear loads with low switching frequency. © 2008 IEEE.
Source Title: IEEE Transactions on Industrial Electronics
ISSN: 02780046
DOI: 10.1109/TIE.2007.909053
Appears in Collections:Staff Publications

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