Research on Grid-Connected Control Strategy of Photovoltaic (PV) Energy Storage Based on Constant Power Operation

Tao Wang, Cunhao Lin (), Kuo Zheng, Wei Zhao and Xinglu Wang
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Tao Wang: Mechanical Engineering, College of Mechanical and Equipment Engineering, New Campus, Hebei University of Engineering, Handan 056038, China
Cunhao Lin: Mechanical Engineering, College of Mechanical and Equipment Engineering, New Campus, Hebei University of Engineering, Handan 056038, China
Kuo Zheng: Mechanical Engineering, College of Mechanical and Equipment Engineering, New Campus, Hebei University of Engineering, Handan 056038, China
Wei Zhao: Mechanical Engineering, College of Mechanical and Equipment Engineering, New Campus, Hebei University of Engineering, Handan 056038, China
Xinglu Wang: Mechanical Engineering, College of Mechanical and Equipment Engineering, New Campus, Hebei University of Engineering, Handan 056038, China

Energies, 2023, vol. 16, issue 24, 1-21

Abstract: In order to effectively mitigate the issue of frequent fluctuations in the output power of a PV system, this paper proposes a working mode for PV and energy storage battery integration. To address maximum power point tracking of PV cells, a fuzzy control-based tracking strategy is adopted. The principles and corresponding mathematical models are analyzed for the three-phase voltage PWM converter and bidirectional DC/DC converter, while feedforward decoupling double closed loop, constant power (PQ), and constant voltage charge/discharge control strategies are proposed. Space vector pulse width modulation (SVPWM) technology is utilized to generate power switching tube driver signals. Finally, a simulation model is developed in MATLAB/Simulink for system analysis. The results demonstrate that the proposed method enables constant grid-connected power generation and constant voltage charging of the energy storage battery when the PV cell’s power generation exceeds that of the grid. When insufficient solar power generation occurs, both the PV system and energy storage battery work together to achieve constant grid-connected power.

Keywords: fuzzy control; PQ control; three-phase voltage-type PWM converter; bidirectional DC/DC converter (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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