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A Photovoltaic-Based DC Microgrid System: Analysis, Design and Experimental Results

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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Electronics 2020, 9(6), 941; https://doi.org/10.3390/electronics9060941
Received: 30 April 2020 / Revised: 19 May 2020 / Accepted: 2 June 2020 / Published: 5 June 2020
(This article belongs to the Special Issue Applications of Power Electronic Circuits and Systems for Future Grid)
Due to the exhaustion of fossil energy, the utilization of renewable energy resources is developing quickly. Due to the intermittent nature of the renewable energy resources, the energy storage devices are usually adopted in renewable power generation system to enhance the system reliability. In this paper, the photovoltaic-based DC microgrid (PVDCM) system is designed, which is composed of a solar power system and a battery connected to the common bus via a boost converter and a bidirectional buck/boost converter, respectively. As the photovoltaic (PV) panels might operate in a maximum power point tracking (MPPT) mode or constant voltage mode, meanwhile, the power can flow between the battery and the load bidirectionally. Therefore, for the sake of optimizing power utilization in the PVDCM system, a control strategy making the system able to switch from one operating mode to another smoothly and automatically is proposed in this paper. Moreover, the small-signal modeling method based on averaged state-space is no more applicable in this study, thus the nonlinear analysis method with discrete-time mapping model is adopted for stability analysis. Based on the stability analysis, the closed-loop parameters are designed to make sure the whole system can operate properly in all operating modes. The control strategy and stability analysis based on the nonlinear analysis method in the closed-loop design are verified by experiment results. View Full-Text
Keywords: DC microgrid; PV system; battery; multiple operating modes; energy management strategy; nonlinear analysis; closed-loop stability DC microgrid; PV system; battery; multiple operating modes; energy management strategy; nonlinear analysis; closed-loop stability
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Xiong, X.; Yang, Y. A Photovoltaic-Based DC Microgrid System: Analysis, Design and Experimental Results. Electronics 2020, 9, 941.

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