Research on LADRC of Grid-Connected Inverter Based on LCCL

Guofeng He, Guanxu Chen, Yanfei Dong, Guojiao Li and Wenjie Zhang
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Guofeng He: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Guanxu Chen: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Yanfei Dong: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Guojiao Li: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Wenjie Zhang: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China

Energies, 2022, vol. 15, issue 13, 1-12

Abstract: A grid-connected inverter’s stability is easily influenced by the system’s internal and external characteristics, especially when the grid-connected inverter is connected to the grid by an LCL filter, which complicates the system design and operating conditions. To handle the problem of disturbance in the high-order grid-connected system of the inverter, a linear active disturbance rejection control (LADRC) strategy based on LCCL (which divides the capacitor of the LCL filter into two halves in a specified proportion) is proposed in this paper. First, the system is reduced from third order to first order by using the split capacitor control method, which solves the difficulties of complicated LCL grid-connected inverter controller design and easy resonance. Meanwhile, the internal and external disturbances of the inverter system are treated as generalized disturbances. Then, the LADRC control is used to adjust the closed-loop system’s parameters, which enhances the quality of the grid current and the system’s stability. Finally, the impacts of PI and LADRC control on the power mutation and voltage drop of an LCCL grid-connected inverter are compared by the experiments. The experimental results show the effectiveness of the proposed LADRC control strategy.

Keywords: LCL grid-connected inverter; LADRC; split capacitor; anti-interference (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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