Power-Rating Balance Control and Reliability Enhancement in Mismatched Photovoltaic Differential Power Processing Systems



Zhu, Yinxiao, Wen, Huiqing, Chu, Guanying, Wang, Xue, Peng, Qilin, Hu, Yihua ORCID: 0000-0002-1007-1617 and Jiang, Lin ORCID: 0000-0001-6531-2791
(2022) Power-Rating Balance Control and Reliability Enhancement in Mismatched Photovoltaic Differential Power Processing Systems. IEEE TRANSACTIONS ON POWER ELECTRONICS, 37 (1). pp. 879-895.

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Abstract

With the increase of the component number, the power stress distribution among differential power processing (DPP) converters, control implementation, system cost, and reliability become the most challenging issues for a practical photovoltaic (PV) DPP system. This article introduces an improved power-rating balance (IPRB) control for the PV-to-bus based DPP architecture that ensures each PV submodule operate at its true maximum power point (MPP) while achieving more balanced power stress distribution and higher reliability. Specifically, a submodule-level finite-state-machine-based MPP tracking is implemented to guarantee always maximum power yield, whereas a string-level power-rating balancing (PRB) control is adopted to balance the unit-maximum proceeded power by DPP converters based on the built power flow model with respect to the string current. A comprehensive comparison of advanced control strategies for PV-to-bus DPP architectures, including least power point tracking, voltage equalization (VE) based PRB control, and the proposed IPRB, has been carried out with the mission-profile-based reliability assessment under different partial shading scenarios. Component-failure-rate-based reliability analysis shows that the PV-to-bus DPP architecture with the proposed IPRB control can significantly improve the system reliability. Main simulation and experimental evaluations are carried out to verify the effectiveness of the proposed control.

Item Type: Article
Uncontrolled Keywords: Reliability, Photovoltaic systems, Solar power generation, Stress, Optimization, Process control, Voltage control, Differential power processing (DPP), maximum power point (MPP) tracking, mismatched photovoltaic (PV), power-rating balancing (PRB)
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 14 Sep 2021 13:37
Last Modified: 18 Jan 2023 21:28
DOI: 10.1109/TPEL.2021.3094220
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3137052