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Disturbance Observer based Internal Model Control for Three Phase LCL-type Inverter
Jinmu Lai,Xianggen Yin,Zhen Wang,Langzi Li,Zhenyu Qi,Xin Yin 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a disturbance observerbased internal model control for the three-phase LCL-type grid-connected inverter. The proposed control scheme is designed in dq-frame, and the compound controller includes an internal model control (IMC) feedback part and a feedforward compensation part for the disturbances by using a disturbance observer (DO). The attractive advantages of this structure are that the lumped disturbances including the strong coupling effects of LCL filter, model mismatched and external disturbances can be suppressed effectively, and the parameters of the two controllers can be designed separately with easy implementation. The simulation and experimental results demonstrate that the proposed method has a better lumped disturbance rejection property than that of PI method in controlling three-phase LCL-type inverter.