Week 9 Challenge

Attached is the Matlab script file(EnergyManagement_Strategy.m) which implements the Energy management strategy.

The input to program is the "UDDS drive cycle(EnergyManagement_Strategy.mat)". Based on the power demand of the vehicle during the drive cycle the ultracapacitor,Fuel Cell & Battery power is taken into operation to supply the demand.

The output of the program is the power request from Ultracapacitor, Fuel cell & Battery units.

The attached code is also provided with comments for its description.

Now coming to the output of the code after execution(EnergyManagement_Output.fig):

The output graph visualizes how power demand is distributed among different energy sources—ultracapacitor , fuel cell , and battery—throughout the drive cycle.

Interpretation of the Output

1. Power Demand (Black Curve)

   • Represents the total energy requirement over time.

   • Initially zero, then gradually rises as the vehicle starts moving.

   • Peaks around 780 seconds, reaching slightly above 35,000 W, indicating a high-energy demand phase.

   • Declines back to zero, likely due to braking or idle periods.

2. Ultracapacitor Request (Red Curve)

   • Mirrors the rapid fluctuations of the power demand curve but at a lower magnitude (~21,000 W max).

   • Handles sharp transient peaks, meaning it absorbs quick bursts of power needed for acceleration.

   • Drops rapidly when demand decreases, showing fast discharge and recharge cycles.

3. Fuel Cell Request (Blue Curve)

   • More gradual and steady compared to UC.

   • Peaks at around 11,000 W, suggesting it provides consistent baseline power rather than transient spikes.

   • Ensures stable energy supply while relying on battery and ultracapacitor for dynamic variations.

4. Battery Request (Green Curve)

   • Relatively low throughout the cycle (~3,000 W peak).

   • Acts as a moderate buffer, supplying stable power between UC (short-term surges) and FC (long-term power).

   • Used during mid-range energy demands rather than sudden peaks.

Behavior Summary

• Ultracapacitor handles rapid energy shifts (high acceleration, braking events).

• Fuel cell provides steady power output (base load energy supply).

• Battery manages intermediate loads, preventing strain on UC and FC.

• Peak power demand occurs at ~780 sec, indicating a significant acceleration or uphill scenario.