MATLAB Implementation of Fuel Cell Battery Driven Electric Vehicle
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MATLAB Implementation of Fuel Cell Battery Driven Electric Vehicle
𝐈𝐧𝐭𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧
Fuel Cell Battery Driven Electric Vehicle
A fuel-cell electric vehicle combines the high-energy capability of a fuel cell with the fast power support of a battery. This MATLAB/Simulink model demonstrates a 𝗳𝘂𝗲𝗹 𝗰𝗲𝗹𝗹–𝗯𝗮𝘁𝘁𝗲𝗿𝘆 hybrid electric vehicle that drives a BLDC motor under different fuel-pressure conditions.
The model includes:
A 24 V fuel-cell source
A P&O MPPT controller
A DC–DC boost converter
A 48 V battery
A three-phase voltage source inverter
Hall-sensor-based BLDC motor commutation
Fuel-cell, battery and motor performance measurements
The simulation also explains how the battery changes between charging and discharging modes when fuel-cell power varies.
𝐒𝐲𝐬𝐭𝐞𝐦 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰
The proposed electric vehicle powertrain contains two energy sources connected to a common DC bus.
Component | Function |
Fuel cell | Supplies the primary electrical power |
P&O MPPT controller | Extracts the maximum available fuel-cell power |
Boost converter | Increases the fuel-cell voltage to the DC-bus level |
Battery | Stores excess energy and supports the motor during low fuel-cell power |
Voltage source inverter | Converts DC power into three-phase AC power |
BLDC motor | Represents the electric vehicle traction motor |
Hall-sensor decoder | Identifies the rotor position for electronic commutation |
Measurement system | Records voltage, current, power, speed, torque and SOC |
𝐒𝐲𝐬𝐭𝐞𝐦 𝐒𝐩𝐞𝐜𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬
Fuel-Cell Parameters
Parameter | Value |
Rated fuel-cell voltage | 24 V |
Nominal operating voltage | 24.23 V |
Nominal operating current | 52 A |
Nominal power | 1.26 kW |
Maximum operating voltage | 20 V |
Maximum operating current | 100 A |
Maximum power | Approximately 2 kW |
Battery and Converter Parameters
Parameter | Value |
Fuel-cell-side voltage | Approximately 24 V |
Regulated DC-bus voltage | 48 V |
Battery nominal voltage | 48 V |
Battery rated capacity | 200 Ah |
Converter type | DC–DC boost converter |
MPPT method | Perturb and Observe |
Power switch | MOSFET |
Motor type | BLDC motor |
𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬
The complete power flow can be understood through the following stages.
1. Fuel-Cell Power Generation
The fuel cell produces DC electrical power according to the supplied fuel and air pressures. Its voltage and current are continuously measured and provided to the MPPT controller.
2. Maximum Power Extraction
The 𝗣&𝗢 𝗠𝗣𝗣𝗧 algorithm processes the measured fuel-cell voltage and current.
The controller considers:
Present fuel-cell voltage
Present fuel-cell current
Calculated fuel-cell power
Change in voltage
Change in power
Previous duty-cycle value
Minimum and maximum duty-cycle limits
Duty-cycle step size
The duty cycle is increased or decreased depending on the change in fuel-cell power.
3. Boost Converter Operation
The duty-cycle command is compared with a triangular carrier waveform to generate the PWM switching pulse.
The PWM pulse controls the boost-converter MOSFET so that:
Fuel-cell voltage is increased from approximately 24 V to 48 V
Maximum available fuel-cell power is transferred to the DC bus
Battery charging becomes possible when excess power is available
The BLDC motor receives the required operating power
4. Battery Power Support
The 48 V battery is connected to the common DC bus.
The battery performs two major functions:
𝗖𝗵𝗮𝗿𝗴𝗶𝗻𝗴 when fuel-cell generation exceeds the motor demand
𝗗𝗶𝘀𝗰𝗵𝗮𝗿𝗴𝗶𝗻𝗴 when fuel-cell generation is insufficient
This hybrid arrangement helps maintain continuous electric motor operation during changes in fuel availability.
5. BLDC Motor Drive
The voltage source inverter supplies three-phase power to the BLDC motor. The inverter operates as an electronic commutator.
The motor-side control system uses:
Three Hall-sensor signals
Rotor-position decoding
Back-EMF state generation
Switching truth tables
Six inverter gate pulses
The generated pulses control switches Q1 to Q6 of the three-phase inverter.
𝐂𝐨𝐧𝐭𝐫𝐨𝐥 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐲
P&O MPPT Control
The P&O MPPT controller continuously searches for the operating point at which the fuel cell delivers maximum power.
Control Parameter | Purpose |
Initial duty cycle | Defines the starting converter operating point |
Maximum duty cycle | Prevents excessive converter operation |
Minimum duty cycle | Maintains safe lower switching limits |
Duty-cycle step | Determines tracking speed and steady-state variation |
Fuel-cell voltage | Identifies changes in operating condition |
Fuel-cell current | Supports real-time power calculation |
PWM Generation
The calculated duty cycle is compared with a high-frequency triangular waveform. The resulting PWM pulse controls the MOSFET of the boost converter.
Hall-Sensor Decoder
The BLDC motor provides three Hall signals representing rotor position. These signals are processed through logic gates and a decoder subsystem.
The decoder determines:
Phase-A back-EMF state
Phase-B back-EMF state
Phase-C back-EMF state
Correct inverter switching sequence
Electronic Commutation
Each back-EMF signal is compared with zero. The positive, negative and zero states are used to determine the required inverter switch combination.
The resulting gate signals control:
Q1 and Q2 for the first inverter leg
Q3 and Q4 for the second inverter leg
Q5 and Q6 for the third inverter leg
This process maintains the required electromagnetic torque and rotor speed.
𝐎𝐩𝐞𝐫𝐚𝐭𝐢𝐧𝐠 𝐂𝐚𝐬𝐞𝐬
The simulation evaluates the hybrid vehicle under different fuel-cell pressure conditions.
Operating Case | Fuel/Air Pressure | Expected System Behaviour |
Case 1 | 1 atm | Fuel cell supplies high power and charges the battery |
Case 2 | 0.5 atm after 4 seconds | Fuel-cell power reduces and battery charging current changes |
Case 3 | 0 atm | Fuel-cell output becomes insufficient and the battery supplies the motor |
𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬
The model measures the electrical and mechanical responses of the complete vehicle system.
Fuel-Cell Results
The fuel-cell scope displays:
Fuel-cell voltage
Fuel-cell current
Fuel-cell output power
At approximately 1 atm pressure:
Fuel-cell voltage reaches nearly 20 V at maximum loading
Fuel-cell current reaches nearly 100 A
Fuel-cell power approaches 2 kW
When the pressure is reduced to 0.5 atm, the available fuel-cell power decreases.
Battery Results
The battery scope displays:
Battery voltage
Battery current
Battery state of charge
During sufficient fuel-cell generation:
Battery voltage remains close to the DC-bus level
The battery operates in charging mode
Battery SOC gradually increases
During zero fuel-cell pressure:
Fuel-cell power becomes insufficient
Battery current changes to the discharging region
Battery SOC begins to decrease
The battery supplies the required motor power
The exact positive or negative sign of battery current depends on the current-direction convention configured in the Simulink battery block.
BLDC Motor Results
The motor-side scopes display:
Stator phase current
Trapezoidal back EMF
Rotor speed
Electromagnetic torque
The results indicate that:
Rotor speed remains nearly constant
Electromagnetic torque remains stable
Stator current continues without major interruption
The battery compensates for reduced fuel-cell power
Vehicle operation continues even when fuel-cell pressure becomes zero
𝐑𝐞𝐬𝐮𝐥𝐭 𝐂𝐨𝐦𝐩𝐚𝐫𝐢𝐬𝐨𝐧
Performance Variable | Normal Fuel Pressure | Reduced Fuel Pressure | Zero Fuel Pressure |
Fuel-cell power | High | Reduced | Very low or unavailable |
Battery mode | Charging | Reduced charging or support | Discharging |
Battery SOC | Increasing | Changes slowly | Decreasing |
Motor speed | Maintained | Maintained | Maintained by battery |
Motor torque | Stable | Stable | Stable with battery support |
Vehicle operation | Fuel cell and battery | Hybrid support | Battery-supported operation |
𝐊𝐞𝐲 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬
MATLAB/Simulink implementation of a 𝗳𝘂𝗲𝗹-𝗰𝗲𝗹𝗹 electric vehicle
Hybrid fuel-cell and battery energy supply
P&O MPPT-based maximum power extraction
DC–DC boost conversion from approximately 24 V to 48 V
Battery charging and discharging analysis
Hall-sensor-based BLDC motor commutation
Six-switch voltage source inverter
Fuel-pressure variation analysis
Battery SOC monitoring
Fuel-cell voltage, current and power measurement
Motor current, back EMF, speed and torque monitoring
Continuous motor operation during fuel-cell power loss
𝐀𝐝𝐯𝐚𝐧𝐭𝐚𝐠𝐞𝐬
Improved power availability through two energy sources
Continuous vehicle operation during low fuel supply
Better fuel-cell energy utilization through MPPT
Battery charging during excess fuel-cell generation
Reduced dependency on the fuel cell during transient conditions
Stable BLDC motor speed and torque
Simple electronic commutation using Hall sensors
Clear visualization of energy flow in MATLAB/Simulink
𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬
This simulation model is suitable for studying:
Fuel-cell electric vehicles
Hybrid electric vehicle energy management
Battery-supported traction systems
BLDC motor drive control
Fuel-cell MPPT techniques
DC–DC boost-converter control
Electronic commutation methods
Battery SOC and current analysis
Alternative-energy transportation systems
Fault and fuel-pressure variation studies
𝐖𝐡𝐨 𝐂𝐚𝐧 𝐔𝐬𝐞 𝐓𝐡𝐢𝐬 𝐌𝐨𝐝𝐞𝐥?
The model is useful for:
Electrical engineering students
Power electronics learners
Electric vehicle researchers
MATLAB and Simulink users
Motor-drive engineers
Fuel-cell system developers
Renewable-energy researchers
Control-system engineers
𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐎𝐮𝐭𝐜𝐨𝐦𝐞𝐬
After studying this model, users can understand:
Fuel-cell operation at nominal and maximum operating points
P&O MPPT implementation for fuel-cell systems
Boost-converter duty-cycle control
Battery charging and discharging behaviour
Hybrid source power balancing
Hall-sensor signal decoding
BLDC motor electronic commutation
Inverter gate-pulse generation
Fuel-pressure effects on fuel-cell power
Battery support during fuel-cell power interruption
𝐅𝐀𝐐
What is the main purpose of the battery?
The battery stores excess fuel-cell energy and supplies the BLDC motor when fuel-cell power is insufficient.
Why is a boost converter required?
The boost converter increases the fuel-cell voltage from approximately 24 V to the 48 V DC-bus level.
Which MPPT method is used?
A 𝗣𝗲𝗿𝘁𝘂𝗿𝗯 𝗮𝗻𝗱 𝗢𝗯𝘀𝗲𝗿𝘃𝗲 MPPT method is used to extract maximum power from the fuel cell.
What happens when fuel-cell pressure becomes zero?
The fuel-cell power reduces significantly, and the battery changes to discharging operation to maintain the motor load.
Which motor is used in the model?
A BLDC motor is used as the electric vehicle traction motor.
How are the inverter switches controlled?
The Hall-sensor signals are decoded into back-EMF states, which are then used to generate six inverter switching pulses.
Which outputs are available for analysis?
Fuel-cell voltage, current and power; battery voltage, current and SOC; motor current, back EMF, rotor speed and electromagnetic torque are available.
𝐂𝐨𝐧𝐜𝐥𝐮𝐬𝐢𝐨𝐧
The MATLAB implementation of a fuel-cell battery-driven electric vehicle demonstrates an effective hybrid energy-management structure. The fuel cell acts as the primary energy source, while the battery stores excess power and supports the BLDC motor during reduced or unavailable fuel-cell generation.
The P&O MPPT-controlled boost converter extracts the available fuel-cell power and regulates the voltage to the 48 V DC-bus level. Hall-sensor-based electronic commutation ensures proper BLDC motor operation. Simulation results confirm that the battery can maintain motor speed and torque even when fuel-cell pressure is reduced to zero.
This model provides a practical platform for understanding 𝗳𝘂𝗲𝗹-𝗰𝗲𝗹𝗹 EV operation, battery power balancing, MPPT control, DC–DC conversion and BLDC motor-drive performance.