研究目的
To propose a control strategy for the SS-CMI, focusing on its characteristics such as low harmonic content and reduced voltage stress across the switches, and to explore the system's response to variations of irradiance, temperature, and grid voltage swell.
研究成果
The proposed control strategy for the SS-CMI effectively balances the dc-link voltages under partial shading and ensures low THD of the grid currents. The system demonstrates good performance under extreme variations of irradiance, temperature, and grid voltage swell.
研究不足
The study is based on simulation results, which may not fully capture all real-world operational challenges. The performance under extreme conditions, such as partial shading and grid voltage swell, is explored, but practical implementation may reveal additional constraints.
1：Experimental Design and Method Selection:
The study employs a simulation-based approach to analyze the performance of the SS-CMI under various conditions. The control strategy includes individual Maximum Power Point Tracking (MPPT) for each photovoltaic array and controllers for grid current and dc-bus voltages.
2：Sample Selection and Data Sources:
Simulation parameters are based on a five-level system with photovoltaic panels KYOCERA-KD245GH-4FB connected to each power module.
3：List of Experimental Equipment and Materials:
The simulation uses parameters such as rms grid voltage, photovoltaic output voltage, input current, and system power, among others.
4：Experimental Procedures and Operational Workflow:
The response of the system is analyzed for steps in the input power, including variations in temperature and irradiance, and a grid voltage swell.
5：Data Analysis Methods:
The performance is evaluated based on the harmonic distortion of the grid current and the balance of dc-link voltages under input disturbances.
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