STEP By STEP Implementation of Three Phase Grid Connected Solar PV System in MATLAB
Introduction
We will walk through the detailed process of implementing a three-phase grid-connected solar PV system using MATLAB. This guide covers everything from setting up the model and configuring the solar panels to designing the boost converter and inverter, and finally testing the system’s performance.
1. Setting Up the Model
To begin, open MATLAB and create a new Simulink model. Navigate through the following steps to set up your basic solar PV model:
Create a New Model: Launch Simulink and open a new model workspace.
Add Solar PV Array: Go to the Simscape library and select Electrical > Specialized Power Systems > Renewables. Drag the solar PV array into your model.
Set Irradiation and Temperature: Add constant blocks from the Simulink library to set the irradiation to 1000 W/m² and the temperature to 25°C. Connect these constants to the corresponding parameters in your solar PV model.
2. Configuring the Solar Panels
Next, configure the solar array to match your system requirements:
Define Panel Specifications: Set up a solar array with 10 series strings of 47 panels each. Each panel should have a rating of 213.15 watts, with an open-circuit voltage of 36.3V and a voltage at the maximum power point of 29V.
Calculate Maximum Power: At 1000 W/m² irradiation, the maximum power output is approximately 100 kW. This value is crucial for determining the efficiency and output of your system.
3. Designing the Boost Converter and MPPT Algorithm
Implementing the boost converter and MPPT (Maximum Power Point Tracking) algorithm is essential for optimizing power extraction:
Add Boost Converter Components: Include a capacitor, inductor, IGBT (Insulated Gate Bipolar Transistor), and diode in your model. Set the capacitor to 1000 µF and the inductor to 0.5 mH.
Configure the MPPT Algorithm: Use a MATLAB function to apply the MPPT algorithm. This function will calculate and adjust the reference voltage to maximize the power output from the solar panels.
4. Building and Integrating the Inverter
Design the three-phase inverter necessary for grid connection:
Create the Inverter Model: Use six IGBT components to construct the three-phase inverter. Connect the positive and negative terminals correctly and ensure that you provide the necessary pulse signals for operation.
Add Filters: Implement RLC (Resistor-Inductor-Capacitor) and RC (Resistor-Capacitor) filters to smooth the output of the inverter. These filters help in reducing harmonics and stabilizing the output voltage.
Measure and Transform Signals: Measure the output voltage and current from the inverter. Convert the three-phase signals to alpha-beta and then to dq coordinates to facilitate control.
5. Final Configuration and Testing
Finalize your model setup and run simulations to test the system:
Configure Control Parameters: Set up the control blocks, including PID controllers and PWM (Pulse Width Modulation) generators, to manage the inverter’s operation.
Run Simulations: Perform simulations to validate the performance of your solar PV system. Check how variations in irradiation affect the system’s power output and ensure the MPPT algorithm is functioning correctly.
Conclusion
By following these steps, you can successfully implement a three-phase grid-connected solar PV system in MATLAB. This process includes setting up the model, configuring solar panels, designing the boost converter and inverter, and finally, testing the system’s performance.
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