A Decentralized Control Strategy for Series-Connected Single-Phase Two-Stage Photovoltaic Grid-Connected Inverters

Zhaoxu Luo, Bo Zhang, Lang Li () and Lixing Tang
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Zhaoxu Luo: School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Bo Zhang: School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Lang Li: Department of Automation, Moutai Institute, Renhuai 564507, China
Lixing Tang: School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China

Energies, 2023, vol. 16, issue 20, 1-13

Abstract: Currently, most of the series inverter control methods rely on communication, which greatly reduces the reliability of the system and increases the cost. To address the above problems, this paper proposes a decentralized control strategy for series-connected single-phase two-stage grid-connected photovoltaic (PV) inverters. By improving the traditional droop control, the frequency and phase of the output voltage of each inverter unit are consistent and self-synchronized with the power grid while relying only on local independent control, and each unit realizes maximum power point tracking (MPPT). At different light intensities, each series-connected unit can quickly track the new maximum power point while still maintaining self-synchronization between the units. The system stability is analyzed via the small signal method, and sufficient conditions for system stability are obtained. Finally, the simulation results verify the correctness and effectiveness of the proposed control strategy.

Keywords: series-connected inverter; photovoltaic inverter; decentralized control; maximum power point tracking (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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