研究目的
Investigating the novel topology and control strategies of a photovoltaic battery energy storage system based on modular multilevel converter.
研究成果
The proposed novel PV battery energy storage system based on the modular multilevel converter, along with its control strategies, has been verified through simulation and experimental results. The system effectively balances capacitor voltages and reliably works under the proposed control strategies. The study contributes to the advancement of renewable energy storage technologies.
研究不足
The study does not address the long-term reliability and efficiency of the proposed system under varying environmental conditions. Additionally, the scalability of the system for larger applications is not discussed.
1：Experimental Design and Method Selection:
The study proposes a novel topology of PV-BESS based on MMC, where batteries are connected to sub-modules through DC-DC converters. The control strategies for both DC-DC converters and MMC are analyzed, focusing on capacitor voltage balancing and modulation mode.
2：Sample Selection and Data Sources:
The simulation model is built in MATLAB, and related experiments are carried out to verify the proposed topology and control strategies.
3：List of Experimental Equipment and Materials:
The hardware structure includes the main control module, sampling and conditioning modules, driver module, switch input and output modules, signal protection module, power supply module, external memory unit, JATG1, JATG2, and CAN bus.
4：Experimental Procedures and Operational Workflow:
The control strategy involves the MPPT control strategy, DC-DC converter control strategy, and DC side voltage control strategy. The sorting method is used for capacitor voltage balancing, and CPS-SWM is proposed for PWM signal generation.
5：Data Analysis Methods:
Simulation and experimental results are analyzed to verify the availability of the proposed topology and control strategies.
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Modular Multilevel Converter
Used as a converter between the PV array and batteries in the proposed PV-BESS topology.
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DC-DC Converter
Connects batteries to the sub-modules of the MMC, enabling the Buck and Boost modes for charging and discharging the batteries.
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IGBT
S1, S2, S3, S4
Used in the sub-modules and DC-DC converters for switching operations.
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Diode
D1, D2, D3, D4
Used in the sub-modules and DC-DC converters for current direction control.
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Capacitor
Co, Cdc, Cl
Used for energy storage and filtering in the sub-modules, DC side, and DC load.
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Inductor
L0, Ls, Lm
Used for current smoothing and energy storage in the branches, output side, and DC-DC converters.
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Resistance
R, Rl
Represents the equivalent resistance of each branch and the resistance of the DC load.
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