研究目的
To investigate the energy yield of a photovoltaic system under partial shading conditions.
研究成果
The energy yield of a photovoltaic system decreases as the shading heaviness increases, with the effect being more significant under lightly partial shaded conditions. The study highlights the need to address partial shading to minimize energy losses in photovoltaic systems.
研究不足
The study is limited to simulations and does not include physical experiments. The impact of partial shading is analyzed for a specific configuration of photovoltaic modules and may vary with different configurations or environmental conditions.
1：Experimental Design and Method Selection:
The study involves simulating the impact of partial shading on a photovoltaic string consisting of 20 photovoltaic modules. The simulation uses Simulink software with solar cell blocks to model the photovoltaic string under various shading conditions.
2：Sample Selection and Data Sources:
The photovoltaic string model is based on photovoltaic modules with specific parameters, including open circuit voltage, short circuit current, ideality factor, and series resistance.
3：List of Experimental Equipment and Materials:
Simulink software and SimElectronics block set are used for simulations. The photovoltaic string model includes solar cell blocks and diode blocks for bypass diodes.
4：Experimental Procedures and Operational Workflow:
The study simulates different shading scenarios by varying the shadow rate (20%, 40%, 60%, 80%, 100%) and the number of shaded modules (5, 10, 15, 20). The output power and voltage are measured to plot P-V characteristics curves.
5：0). The output power and voltage are measured to plot P-V characteristics curves.
Data Analysis Methods:
5. Data Analysis Methods: The maximum power points from the P-V characteristics curves are used to calculate the total energy yield of the photovoltaic string under each shading condition.
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