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PWM methods to handle time delay in digital control of a UPS inverter

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3 Author(s)
Heng Deng ; Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore ; Oruganti, R. ; Srinivasan, D.

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.

Published in:

Power Electronics Letters, IEEE  (Volume:3 ,  Issue: 1 )