Robust Model Predictive Current Control of Three-Phase Voltage Source PWM Rectifier With Online Disturbance Observation

• Published in: IEEE transactions on industrial informatics Vol. 8; no. 3; pp. 459 - 471
• Main Authors: Xia, Changliang, Wang, Meng, Song, Zhanfeng, Liu, Tao
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-08-2012; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Disturbance observer; Disturbance observers; Disturbances; Electric potential; Mathematical analysis; Mathematical models; model predictive current controller; Modulation; Observers; parameter errors; Pulse duration modulation; rectifier; Rectifiers; Robustness; root-locus analysis; stability analysis; Studies; Switches; Vectors; Voltage; Voltage control
• ISSN: 1551-3203; 1941-0050
• DOI: 10.1109/TII.2012.2187912

This paper presents a robust model predictive current controller with a disturbance observer (DO-MPC) for three-phase voltage source PWM rectifier. The new algorithm is operated with constant switching frequency (CF-MPC). In order to minimize instantaneous d- and q-axes current errors in every sampling period, CF-MPC is implemented by selecting appropriate voltage vector sequence and calculating duty cycles. The fundamental of this algorithm is discussed and the instantaneous variation rates of d- and q-axes currents are deduced when each converter voltage vector is applied in six different sectors. A Luenberger observer is constructed for parameter mismatch and model uncertainty which affect the performance of the MPC. The gains of the disturbance observer are determined by root-locus analysis. Moreover, the stability of the disturbance observer is analyzed when there are errors in the inductor filter parameter. The proposed method has an inherent rapid dynamic response as a result of the MPC controller, as well as robust control performance with respect to the disturbance due to use of the combined observation algorithm. Simulation and experimental results on a 1.1 kW VSR are conducted to validate the effectiveness of the proposed solution.