𝐏&𝐎 𝐌𝐏𝐏𝐓 𝐟𝐨𝐫 𝐖𝐢𝐧𝐝 𝐄𝐧𝐞𝐫𝐠𝐲 𝐂𝐨𝐧𝐯𝐞𝐫𝐬𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦 𝐰𝐢𝐭𝐡 𝐆𝐫𝐢𝐝
- lms editor
- 18 hours ago
- 6 min read
𝐏&𝐎 𝐌𝐏𝐏𝐓 𝐟𝐨𝐫 𝐖𝐢𝐧𝐝 𝐄𝐧𝐞𝐫𝐠𝐲 𝐂𝐨𝐧𝐯𝐞𝐫𝐬𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦 𝐰𝐢𝐭𝐡 𝐆𝐫𝐢𝐝
𝐈𝐧𝐭𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧
The P&O MPPT for Wind Energy Conversion System with Grid model demonstrates the complete MATLAB/Simulink implementation of a grid-connected wind power system.
The model combines a wind turbine, permanent-magnet synchronous generator, diode rectifier, boost converter, P&O MPPT controller, grid inverter and LCL filter. It extracts maximum wind power, regulates the DC-link voltage and transfers active power to the utility grid with low current distortion.
This simulation is suitable for students, researchers and engineers interested in:
Wind energy conversion
Maximum power point tracking
PMSG generator modelling
Grid-connected inverter control
DC-link voltage regulation
Power-quality analysis
𝐒𝐲𝐬𝐭𝐞𝐦 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰
The wind energy conversion system contains the following major sections:
Section | Main function |
Wind turbine | Converts wind energy into mechanical power |
PMSG | Converts mechanical power into electrical power |
Diode rectifier | Converts PMSG AC output into DC |
Boost converter | Increases and regulates the rectified voltage |
P&O MPPT | Extracts maximum available wind power |
DC link | Provides a stable DC supply for the inverter |
Single-phase inverter | Converts DC power into grid-compatible AC power |
LCL filter | Reduces inverter switching harmonics |
Grid | Receives the generated active power |
PLL and controller | Synchronize and control grid power injection |
The complete energy-conversion path is:
Wind Turbine → PMSG → Diode Rectifier → Boost Converter → DC Link → Inverter →
LCL Filter → Grid
𝐌𝐚𝐢𝐧 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐏𝐚𝐫𝐚𝐦𝐞𝐭𝐞𝐫𝐬
Parameter | Value or operating condition |
Wind energy system rating | 3 kW |
Initial wind speed | 12 m/s |
Wind speed after 1 second | 10.8 m/s |
Pitch angle | 0° |
Regulated DC-link voltage | 400 V |
Grid frequency | 50 Hz |
MPPT method | Perturb and Observe |
Generator type | PMSG |
Rectifier type | Diode rectifier |
Grid-side converter | Single-phase inverter |
Grid filter | LCL filter |
Reactive-current reference | Zero |
Measured current THD | Approximately 1.70% |
𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬
1. Wind-Power Generation
The wind turbine receives three important inputs:
Wind speed
Generator rotational speed
Pitch angle
The turbine converts the available wind energy into mechanical torque. This torque drives the PMSG, which generates variable-frequency AC power.
The generator speed is measured, converted into a suitable per-unit value and supplied to the wind-turbine model.
2. AC-to-DC Conversion
The three-phase output of the PMSG is connected to a diode rectifier.
The rectifier:
Converts variable AC voltage into DC voltage
Supplies the input of the boost converter
Provides voltage and current signals for MPPT control
3. Maximum-Power Extraction
The rectifier voltage and current are measured and supplied to the P&O MPPT controller.
The controller:
Monitors the change in wind-generator power
Adjusts the boost-converter duty cycle
Searches for the maximum-power operating point
Continues tracking when wind speed changes
The resulting duty cycle is processed through a PWM generator to produce the switching signal for the boost-converter MOSFET.
4. DC-Link Regulation
The boost converter transfers the extracted wind power to the DC link.
Its main functions are:
Increasing the rectifier output voltage
Supporting maximum-power extraction
Maintaining sufficient voltage for grid integration
Transferring wind power efficiently to the inverter
The DC-link voltage is controlled at approximately 400 V.
5. Grid-Power Injection
The single-phase inverter converts the regulated DC-link power into AC power.
The inverter output is connected to the grid through an LCL filter, which helps:
Reduce switching-frequency harmonics
Improve grid-current quality
Produce a smooth sinusoidal current
Support low-distortion power injection
𝐂𝐨𝐧𝐭𝐫𝐨𝐥 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐲
𝐏&𝐎 𝐌𝐏𝐏𝐓 𝐂𝐨𝐧𝐭𝐫𝐨𝐥
The P&O controller operates on the wind-generator side.
Its input signals are:
Rectifier voltage
Rectifier current
Its output is:
Boost-converter duty cycle
The controller continuously adjusts the duty cycle to extract the maximum available power from the wind energy system.
𝐏𝐋𝐋-𝐁𝐚𝐬𝐞𝐝 𝐆𝐫𝐢𝐝 𝐒𝐲𝐧𝐜𝐡𝐫𝐨𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧
The grid voltage is measured and processed by a phase-locked loop.
The PLL generates the grid phase angle, which is used for:
Synchronizing the inverter with the grid
Transforming measured signals into the rotating reference frame
Producing properly aligned inverter-control signals
Maintaining stable grid integration
𝐃𝐂-𝐋𝐢𝐧𝐤 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥
The measured DC-link voltage is compared with the 400 V reference.
A PI controller processes the voltage error and generates the active-current reference. This allows the inverter to transfer the available wind power while maintaining a stable DC-link voltage.
𝐝–𝐪 𝐂𝐮𝐫𝐫𝐞𝐧𝐭 𝐂𝐨𝐧𝐭𝐫𝐨𝐥
The inverter current and grid voltage are transformed into d–q components.
The control objectives are:
Control component | Objective |
d-axis current | Controls active-power transfer |
q-axis current | Controls reactive-power transfer |
q-axis reference | Set to zero |
DC-link controller | Generates active-current reference |
Feedforward decoupling | Improves dynamic response and current control |
Setting the q-axis current reference to zero helps the inverter inject mainly active power into the grid.
𝐅𝐞𝐞𝐝𝐟𝐨𝐫𝐰𝐚𝐫𝐝 𝐃𝐞𝐜𝐨𝐮𝐩𝐥𝐢𝐧𝐠 𝐂𝐨𝐧𝐭𝐫𝐨𝐥
Feedforward decoupling is applied to reduce interaction between the d-axis and q-axis control loops.
This control improves:
Current tracking
Dynamic response
Active and reactive power control
DC-link voltage stability
Grid-current quality
The generated voltage-reference signals are converted back into the stationary reference frame and supplied to the PWM generator.
𝐏𝐖𝐌 𝐏𝐮𝐥𝐬𝐞 𝐆𝐞𝐧𝐞𝐫𝐚𝐭𝐢𝐨𝐧
The inverter voltage reference is processed by the PWM generator.
The PWM section produces switching pulses for the inverter switches and controls:
Inverter output voltage
Grid current
Active-power injection
Reactive-power exchange
Harmonic performance
𝐕𝐚𝐫𝐢𝐚𝐛𝐥𝐞 𝐖𝐢𝐧𝐝-𝐒𝐩𝐞𝐞𝐝 𝐎𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧
The wind-speed profile is changed during the simulation to test the system response.
Simulation period | Wind speed | Expected response |
Initial operating period | 12 m/s | Wind system operates near rated power |
After 1 second | 10.8 m/s | Generated power and grid current decrease |
After the transition | 10.8 m/s | DC-link voltage returns to approximately 400 V |
When the wind speed decreases:
The available wind power reduces
Rectifier power decreases
Boost-converter power decreases
Inverter current decreases
Grid current decreases
Active power supplied to the grid decreases
Despite this variation, the controller maintains stable grid-connected operation.
𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬
𝐑𝐞𝐜𝐭𝐢𝐟𝐢𝐞𝐫 𝐚𝐧𝐝 𝐁𝐨𝐨𝐬𝐭-𝐂𝐨𝐧𝐯𝐞𝐫 𝐕𝐨𝐥𝐭𝐚𝐠𝐞
The rectifier voltage varies according to the wind-generator operating condition.
The boost converter raises this voltage and supports the regulation of the DC link at approximately 400 V. A small transient is visible during startup and after the wind-speed variation.
𝐖𝐢𝐧𝐝-𝐏𝐨𝐰𝐞𝐫 𝐓𝐫𝐚𝐜𝐤𝐢𝐧𝐠
At the initial wind speed, the system power settles close to the 3 kW operating level.
The P&O controller tracks the available maximum power by adjusting the boost-converter duty cycle. When the wind speed decreases, the controller moves the system to the new operating point.
𝐃𝐂-𝐋𝐢𝐧𝐤 𝐕𝐨𝐥𝐭𝐚𝐠𝐞
The DC-link voltage:
Reaches approximately 400 V after startup
Experiences a small transient during wind-speed variation
Returns to the reference value after the controller response
Remains sufficiently stable for grid-inverter operation
𝐆𝐫𝐢𝐝 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 𝐚𝐧𝐝 𝐂𝐮𝐫𝐫𝐞𝐧𝐭
The simulation shows that:
The grid voltage is sinusoidal
The inverter current is sinusoidal
The grid current is sinusoidal
Grid voltage and injected current remain in phase
Current magnitude changes according to available wind power
The in-phase voltage and current indicate active-power transfer from the wind energy system to the grid.
𝐑𝐞𝐚𝐥 𝐚𝐧𝐝 𝐑𝐞𝐚𝐜𝐭𝐢𝐯𝐞 𝐏𝐨𝐰𝐞𝐫
Power component | Observed behaviour |
Real power | Supplied from the wind system to the grid |
Reactive power | Controlled close to zero after the transient |
Wind-speed reduction | Causes lower real-power injection |
Steady-state operation | Stable active-power transfer |
𝐓𝐇𝐃 𝐀𝐧𝐚𝐥𝐲𝐬𝐢𝐬
The grid-current harmonic performance is evaluated using the FFT Analysis tool available through the powergui block.
The demonstrated FFT settings include:
FFT setting | Value |
Analysis start time | 0.3 seconds |
Fundamental frequency | 50 Hz |
Maximum frequency | 1,000 Hz |
Measured THD | Approximately 1.70% |
The obtained THD confirms that the inverter and LCL filter produce a high-quality sinusoidal current with low harmonic distortion.
𝐊𝐞𝐲 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬
Complete 3 kW wind energy conversion system
PMSG-based wind-power generation
Diode-rectifier modelling
P&O maximum-power-point tracking
PWM-controlled boost converter
Regulated 400 V DC link
Single-phase grid-connected inverter
PLL-based grid synchronization
d–q current-control structure
Feedforward decoupling control
Zero reactive-current reference
LCL-filter implementation
Variable wind-speed testing
Real and reactive power measurement
FFT and current-THD analysis
Approximately 1.70% current THD
𝐁𝐞𝐧𝐞𝐟𝐢𝐭𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐌𝐨𝐝𝐞𝐥
This MATLAB/Simulink model helps users understand:
How maximum wind power is extracted using P&O MPPT
How PMSG output is converted into regulated DC power
How the DC-link voltage is maintained
How a grid inverter is synchronized using a PLL
How active and reactive power are controlled
How an LCL filter improves current quality
How wind-speed changes affect grid power
How FFT analysis is used to calculate current THD
𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬
The model can support studies related to:
Grid-connected wind energy conversion
PMSG generator control
Wind MPPT algorithm evaluation
Renewable-energy grid integration
DC-link voltage regulation
Grid inverter control
Power-electronics converter analysis
LCL-filter performance
Active and reactive power management
Power-quality and harmonic assessment
Variable wind-speed operation
MATLAB/Simulink training and research
𝐖𝐡𝐨 𝐂𝐚𝐧 𝐔𝐬𝐞 𝐓𝐡𝐢𝐬 𝐌𝐨𝐝𝐞𝐥?
This simulation is useful for:
Electrical engineering students
Power-electronics learners
Renewable-energy researchers
MATLAB/Simulink users
Wind-energy engineers
Grid-integration researchers
Control-system developers
Academic trainers
𝐂𝐨𝐧𝐜𝐥𝐮𝐬𝐢𝐨𝐧
The P&O MPPT for Wind Energy Conversion System with Grid model provides a complete simulation of wind-power generation and grid integration in MATLAB/Simulink.
The PMSG generates electrical power from the wind turbine, while the diode rectifier and P&O-controlled boost converter extract and transfer the available maximum power. The grid inverter uses PLL synchronization, DC-link voltage control, d–q current regulation and feedforward decoupling to inject active power into the utility grid.
The simulation demonstrates stable operation under wind-speed variation, regulation of the DC link near 400 V, reactive power close to zero and low grid-current distortion of approximately 1.70% THD.