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Inverter Output Voltage Control of Three-Phase UPS Systems Using Feedback Linearization

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2 Author(s)
Dong-Eok Kim ; Yeungnam Univ., Gyeongsan ; Dong-Choon Lee

In this paper, an improved nonlinear control strategy of the inverter output voltage for the three-phase UPS systems is proposed. At first, a nonlinear modeling including the output LC filters is derived from the power balance condition between the inverter output and load sides. Then input-output feedback linearization is applied to the nonlinear model, which can be linearized. The controller of the linearized model can be designed easily by linear control theory. The tracking control law is obtained with the pole placement technique. It is shown that the proposed control scheme gives high dynamic responses at load variation as well as a zero steady-state error.

Published in:

Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE

Date of Conference:

5-8 Nov. 2007