전력전자학회:학술대회논문집 (Proceedings of the KIPE Conference)
- 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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- Pages.830-835
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- 1998
Design of Digital Controller for Uninterruptible Power Supply Using Disturbance Observer
- Cho, Jun-Seok (Dept. of Electrical Eng., Kon-Kuk University) ;
- Lee, Seung-Yo (Dept. of Electrical Eng., Kon-Kuk University) ;
- Mok, Hyung-Soo (Dept. of Electrical Eng., Kon-Kuk University) ;
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Choe, Gyu-Ha
(Dept. of Electrical Eng., Kon-Kuk University)
- 발행 : 1998.10.01
초록
This paper describes a new digital control method of 3-phase PWM inverter with LC filter for uninterruptible power supply(UPS). The overall control system is based on the dead beat control, which has the minor loop of current control within the voltage control major loop. In this paper, the full-order disturbance observer is proposed to compensate the disturbances generated due to a sudden change of load currents. The proposed disturbance observer is composed of dead beat observer which estimates state values within a finite time, and cancels the disturbances by adding feedforward compensation loop in the control system. In addition, on order to remove a defect of oscillation generated in output of conventional dead beat controller, a modified dead beat algorithm is proposed in this paper.
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