Simulation of PV array with Partial Shading Effect
In this simulation, we explore the impact of partial shading on a Photovoltaic (PV) system with three parallel series of panels. Each panel in the series has a bypass diode to address shading-induced issues. Partial shading occurs when some part of a panel is covered, leading to a reduction in current flow. Bypass diodes help mitigate this effect
PV Panels: Three panels connected in parallel-series configuration.
Bypass Diodes: Each panel has a bypass diode to handle partial shading conditions.
Constant Block: Sets the radiation and temperature values for the PV panels.
Controlled Voltage Source with Ramp Input: Varied voltage to observe the impact on the PV system.
Current and Voltage Measurements: Monitors current and voltage across the PV panels.
Power Measurement: Calculates power by multiplying current and voltage.
PV Panel Configuration: Connect three PV panels in parallel-series with bypass diodes to simulate partial shading conditions.
Constant Block Settings: Set the radiation to 1000 W/m² and temperature to 25°C. These values can be adjusted based on environmental conditions.
Ramp Input: Use a ramp input to vary the voltage across the PV panels, simulating changing irradiation conditions.
Simulation and Analysis
Slope Adjustment: Adjust the slope of the ramp input to observe changes in voltage, current, and power.
Scope Observations: Utilize the scope to visualize the variations in current, voltage, and power. Peaks in the graphs indicate the effects of partial shading on different PV panels.
Understanding the Results
The simulation demonstrates how partial shading affects the PV system, leading to variations in current and power outputs. Peaks in the graphs represent instances where shading impacts specific panels, causing changes in power generation. The bypass diodes help maintain stable operation during partial shading events.
Optimization and Further Analysis
Bypass Diode Configuration: Explore different configurations of bypass diodes to optimize performance during shading.
System Response: Analyze how quickly the system responds to changes in irradiation and the effectiveness of the bypass diodes in maintaining power output.
This simulation provides valuable insights into the behavior of PV systems under partial shading conditions. Understanding how bypass diodes and system configurations impact performance is crucial for optimizing solar energy systems. The Simulink model offers a practical tool for researchers and engineers to study and enhance the efficiency of PV systems.
In summary, the simulation results highlight the importance of addressing partial shading effects and implementing appropriate measures, such as bypass diodes, to ensure consistent and efficient power generation in solar installations.