Coupled-DC Module-Based Photovoltaic System With Power Mismatch-Tolerated Modulation

Wang, Cheng; Peng, He; He, Liqun; Li, Lei; Xue, Yaosuo

doi:10.1109/jestpe.2021.3131182

Coupled-DC Module-Based Photovoltaic System With Power Mismatch-Tolerated Modulation

Journal Article · Tue Nov 29 00:00:00 EST 2022 · IEEE Journal of Emerging and Selected Topics in Power Electronics

DOI:https://doi.org/10.1109/jestpe.2021.3131182· OSTI ID:1906570

^[1]; Peng, He ^[1]; ^[2]; Li, Lei ^[1]; ^[3]

Nanjing University of Information Science and Technology (China)
Soochow University, Suzhou (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, this article presents a coupled-DC power module-based cascaded multilevel converter integrating utility-scale photovoltaic (PV) generations (coupled-DC-link power module (CDPM)-PV). CDPM-PV inherits merits such as modular structure, distributed maximum power point tracking (MPPT), direct distribution grid access, from cascaded H-bridge-based PV (CHB-PV) system. But, it supplies more flexible power routes than CHB-PV, through coupling different DC-links. Power routes are intended for enlarging the entire operating range including conditions of active power mismatch arising from nonideal elements such as partial shading and parameter variations. The system construction with its self-balancing principle is first introduced. Switching states for different operating regions are then derived based on the principle of easing implementation. Based on these, a modulation strategy including initial switching pattern selection and coordinated power routing is proposed to allow module-mismatches. Operating ranges are also analyzed and compared with conventional CHB-PV. Simulation results of a 3-MW/13.8-kV system developed in MATLAB/Simulink platform, and experiment results based on a 2.4-kW/311-V setup are presented and have demonstrated that the CDPM-PV topology with proposed modulation strategy can not only ride through a larger range of module mismatches, but also improve solar power utilization and system efficiency owing to noncompromised MPPT.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Natural Science Foundation of Jiangsu Province; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1906570

Journal Information:: IEEE Journal of Emerging and Selected Topics in Power Electronics, Journal Name: IEEE Journal of Emerging and Selected Topics in Power Electronics Journal Issue: 6 Vol. 10; ISSN 2168-6777

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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