Project 1

Key Components of the Model

Inputs:

• powerDemand (from powerDemandData.mat)

• MinFCPower = 3000

• MaxFCPower = 8000

States & Transitions:

• FCS_Standby_And_BatteryRunning → Battery powers the system when powerDemand < MinFCPower.

• FCS_Running → Fuel cell powers the system when MinFCPower ≤ powerDemand ≤ MaxFCPower.

• BatteryAssist → Battery helps fuel cell when powerDemand > MaxFCPower.

Outputs:

• fuelCellPower (fuel cell energy supply)

• batteryPower (battery energy supply)

• fcOperatingState (standby = 0, running = 1, battery assist = 2)
  
  
  Now breakdown of the statechart:
  
  

  State Transitions

  • The system shifts between FCSStandby_And_BatteryRunning, FCS_Running, and BatteryAssist based on power demand conditions.

  • Transitions happen when powerDemand crosses MinFCPower and MaxFCPower.

  Fuel Cell Behavior

  • Active (fcOperatingState = 1) when MinFCPower ≤ powerDemand ≤ MaxFCPower.

  • Off (fcOperatingState = 0) when powerDemand < MinFCPower.

  Battery Support

  • Battery provides full power when powerDemand < MinFCPower.

  • Battery supplements the fuel cell when powerDemand > MaxFCPower.
    
    
    
    

    Interpretation of Simulation Outputs:
    
    
    

    Based on your Stateflow model’s simulation output, here’s how the system performed over 100 seconds:

    1. Power Demand Behavior

    • The power demand fluctuates significantly, starting around 5000 units, peaking near 8000 units, and then stabilizing before dropping towards the end.

    • These fluctuations trigger transitions in power management between the fuel cell and battery.

    2. Fuel Cell Power Response

    • Fuel Cell supplies power initially (stable at 5000 units).

    • Around 50 seconds, the fuel cell power drops to zero, indicating a transition to standby mode.

    • Later, it ramps back up to 5000 units, meaning the fuel cell resumed operation.

    3. Battery Power Compensation

    • Initially, battery does not supply power (operating in standby).

    • As the fuel cell shuts down at 50s, battery power jumps to 5000 units.

    • Later, battery power drops back to zero when the fuel cell resumes operation.

      4. Fuel Cell Operating State Behavior

    • Starts in running state (fcOperatingState = 1).

    • At 50s, transitions to standby (fcOperatingState = 0), matching the fuel cell shutdown.

    • Then transitions back to running (fcOperatingState = 1), when the fuel cell resumes.