TY - GEN
T1 - Design of Observer-Based Active Damping Using Disturbance Observer for Grid-Connected Inverter with LCL Filter
AU - Liu, Jiahao
AU - Wu, Weimin
AU - Gao, Ning
AU - He, Yuanbin
AU - Chung, Henry Shu-Hung
AU - Blaabjerg, Frede
PY - 2018/11
Y1 - 2018/11
N2 - In applications of grid-tied inverters with LCL filter, the digital delay and lumped disturbance may deteriorate the performance, even result in instability. For the purpose of alleviating the impact of computational delay and improve the ability against disturbance, this paper presents a composite controller based on the disturbance and state observer, combining with a PI controller and a full state-feedback which plays a role of the active damping. The proposed strategy utilizes a state observer as a state predictor to eliminate the influence of computational delay, and a disturbance observer to suppress the model uncertainty and unmodeled dynamics. Therefore, an excellent transient response of system can be achieved. Simulation results demonstrate that the designed system has the characteristics of superior disturbance rejection, desired transient and steady-state performances.
AB - In applications of grid-tied inverters with LCL filter, the digital delay and lumped disturbance may deteriorate the performance, even result in instability. For the purpose of alleviating the impact of computational delay and improve the ability against disturbance, this paper presents a composite controller based on the disturbance and state observer, combining with a PI controller and a full state-feedback which plays a role of the active damping. The proposed strategy utilizes a state observer as a state predictor to eliminate the influence of computational delay, and a disturbance observer to suppress the model uncertainty and unmodeled dynamics. Therefore, an excellent transient response of system can be achieved. Simulation results demonstrate that the designed system has the characteristics of superior disturbance rejection, desired transient and steady-state performances.
KW - disturbance observer
KW - full state feedback
KW - LCL filter
KW - state observer
UR - https://www.scopus.com/pages/publications/85060981296
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85060981296&origin=recordpage
U2 - 10.1109/PEAC.2018.8590419
DO - 10.1109/PEAC.2018.8590419
M3 - RGC 32 - Refereed conference paper (with host publication)
T3 - Proceedings - IEEE International Power Electronics and Application Conference and Exposition, PEAC
BT - Conference Proceedings - 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)
PB - IEEE
T2 - 2018 IEEE International Power Electronics and Application Conference and Exposition (IEEE PEAC 2018)
Y2 - 4 November 2018 through 7 November 2018
ER -