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Microcontroller-based discrete feedforward integral variable structure control for an uninterruptible power system (UPS)

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2 Author(s)
Phakamach, P. ; Dept.of Electron. Eng., North Eastern Univ., Khonkaen, Thailand ; Akkaraphong, C.

A discrete feedforward integral variable structure control or DFIVSC for the uninterruptible power system (UPS) are presented, which is tracking a sinusoidal AC voltage with specified frequency and amplitude. The DFIVSC algorithm combines feedforward strategy with the conventional variable structure control. The control function is derived to guarantee the existence of a sliding mode. The experimental results illustrate that the proposed approach gives a significant improvement on the tracking performances when compared with some existing control methods, like the IVSC and MIVSC strategies. Moreover, it can achieve the requirements of robustness and can supply a high-quality voltage power source in the presence of plant parameter variations, external load disturbances and nonlinear dynamic interactions.

Published in:

Power Electronics and Drive Systems, 2003. PEDS 2003. The Fifth International Conference on  (Volume:2 )

Date of Conference:

17-20 Nov. 2003

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