Fuzzy MPPT and P&O MPPT Battery Charging Control
Simulink Model Overview
The Simulink model used for this comparison involves a setup with:
2000 watts PV panel (4 panels in series, 2 parallel strings)
PV panel specifications: 36.6V open circuit voltage, 30.9V maximum power point voltage, 8.75A short circuit current, and 8.4A maximum power point current.
Fuzzy MPPT Controller
Description of Fuzzy MPPT Controller Operation
Utilizes fuzzy logic to track the maximum power point of the PV panel efficiently.
Monitors PV panel voltage (Vpv) and current (Ipv), adjusting duty cycles to extract maximum power.
Includes logic to measure state of charge (SOC) and battery voltage, ensuring optimal charging conditions.
Design and Functionality
Implements fuzzy rules based on delta power (ΔP) and delta voltage (ΔV) to dynamically adjust duty cycles.
Ensures smooth operation under varying irradiation levels, maintaining stability in power extraction.
Simulations Results
Demonstrates smooth transitions and optimized power extraction, with minimal oscillations in PV panel characteristics and battery currents.
P&O MPPT Controller
Description of P&O MPPT Controller Operation
Uses perturb and observe algorithm to adjust duty cycles based on power and voltage differentials.
Sensitive to changes in irradiation levels, potentially causing oscillations in PV panel and battery currents.
Design and Functionality
Adjusts duty cycles incrementally based on whether power (ΔP) is increasing or decreasing.
May exhibit oscillatory behavior during sudden changes in irradiation, affecting overall system stability.
Simulations Results
Shows response to varying irradiation with noticeable transitions in PV panel and battery currents, highlighting sensitivity to rapid changes.
Comparison of Controllers
PV Panel Characteristics
Fuzzy MPPT: Maintains stability with minimal oscillations.
P&O MPPT: Exhibits oscillatory behavior under changing conditions.
Battery Charging Efficiency
Fuzzy MPPT: Provides smooth charging with consistent power extraction.
P&O MPPT: Effective but may experience transient oscillations impacting efficiency.
System Stability
Fuzzy MPPT: Offers robust stability across different irradiation levels.
P&O MPPT: Requires careful tuning to mitigate oscillations and ensure stable operation.
Conclusion
In conclusion, both Fuzzy MPPT and P&O MPPT controllers offer effective methods for optimizing battery charging from PV panels. The choice between these controllers depends on specific application requirements, considering factors such as stability, efficiency, and response to dynamic environmental changes.
Comments