Please use this identifier to cite or link to this item: https://doi.org/10.1109/LPEL.2004.842402
Title: PWM methods to handle time delay in digital control of a UPS inverter
Authors: Deng, H.
Oruganti, R. 
Srinivasan, D. 
Keywords: Digital control
Pulse width modulation
PWM inverter
Uninterruptible power supply
Issue Date: Mar-2005
Source: Deng, H.,Oruganti, R.,Srinivasan, D. (2005-03). PWM methods to handle time delay in digital control of a UPS inverter. IEEE Power Electronics Letters 3 (1) : 1-6. ScholarBank@NUS Repository. https://doi.org/10.1109/LPEL.2004.842402
Abstract: With the popularity of micro-processors, digital controllers are widely used in uninterruptible power supply (UPS) inverters. These digital control systems of UPS inverters require a time interval for sampling and computation, which sometimes affects the performance of inverters. In this paper, the problem of time delay in digital control of a UPS inverter is discussed. Then two novel pulsewidth modulation (PWM) methods, the two-polarity PWM method and the asymmetric PWM method, are proposed to handle the time-delay problem. Both of these PWM methods can achieve a wide range of duty ratio between 0.05-0.95, which is independent of inverter model. Furthermore, they are easy to implement using a digital micro-controller. Experimental results are presented in the paper to verify feasibility of the proposed PWM methods. © 2005 IEEE.
Source Title: IEEE Power Electronics Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/57161
ISSN: 15407985
DOI: 10.1109/LPEL.2004.842402
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