Jae-Young Jang, Kyo-Beum Lee, Joong-Ho Song, Ick Choy, Ji-Yoon Yoo, and Ju-Yeop Choi, "A Disturbance Observer-Based Load Current Estimation Method for Ups Inverter Applications," The Transactions of the Korean Institute of Electrical Engineers, vol. 51, n > Paper

Design and analysis of disturbance observer-based deadbeat control for single-phase inverter applications are comprehensively

presented in this paper. Load current can be estimated by disturbance observer, which is basically structured with the first order

equation in this case and is regarded as a relatively simple method in comparison with conventional full-order Luenberger

observer. Also, an inherent one-step delay problem appeared in the deadbeat control method is overcome by a simple prediction

technique proposed. Output voltage dip is reduced by the feedforward control with the change rate of the estimated load current

involved in the deadbeat current control loop. The proposed algorithms are verified by the respective simulation and experiment

results.