Application of an Improved STSMC Method to the Bidirectional DC–DC Converter in Photovoltaic DC Microgrid

Siyuan Liu, Xiaona Liu, Shaojie Jiang, Zengnan Zhao, Ning Wang, Xiaoyu Liang, Minghui Zhang and Lihua Wang
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Siyuan Liu: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Xiaona Liu: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Shaojie Jiang: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Zengnan Zhao: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Ning Wang: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Xiaoyu Liang: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Minghui Zhang: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China
Lihua Wang: School of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao 266000, China

Energies, 2022, vol. 15, issue 5, 1-16

Abstract: In a photovoltaic DC microgrid, the intermittent power supply of the distributed generation and the fluctuation of the load power will cause the instability of the bus voltage. An improved super-twisting sliding mode control method based on the super-twisting algorithm is proposed to solve this problem. In this paper, a bidirectional half-bridge buck–boost converter was selected as the research topic. The proposed control method replaces the sign function with the saturation function to further mitigate the chattering effect. The stability of the proposed control method was proven to be finite-time convergent using the Lyapunov theory control. Compared with PI control, linear sliding mode control, and terminal sliding mode control, the proposed control method reduces the system overshoot by up to 33% and greatly improves the response speed; compared with the traditional super-twisting sliding mode control method, the system overshoot is reduced by 6.8%, and the response speed is increased by 38%. The experimental results show that the proposed control method can reduce the fluctuation range of the bus voltage, shorten the time of bus voltage stability, effectively stabilize the bus voltage of the photovoltaic DC microgrid, and maintain strong robustness.

Keywords: photovoltaic DC microgrid; bidirectional half-bridge buck–boost converter; super-twisting sliding mode control; robustness (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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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