Grid Connected PV System With SEPIC Converter

Grid Connected PV System With SEPIC Converter

𝐈𝐧𝐭𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧

The Grid Connected PV System With SEPIC Converter in MATLAB is a complete MATLAB/Simulink model designed to study solar PV power generation, SEPIC converter operation, MPPT control, inverter control, and grid power injection.

This model is suitable for students, researchers, and engineers who want to understand how a solar PV system is connected to the grid using power electronics and control techniques.

𝐒𝐲𝐬𝐭𝐞𝐦 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

1. The system uses a solar PV array as the main energy source.

2. A SEPIC converter is used to boost and regulate the PV voltage.

3. Incremental Conductance MPPT is used to extract maximum power from the PV array.

4. A Voltage Source Inverter converts DC power into AC power.

5. An LCL filter improves the quality of the grid current.

6. The inverter is connected to a 400 V, 50 Hz grid.

7. PLL-based synchronization is used for proper grid connection.

𝐏𝐕 𝐀𝐫𝐫𝐚𝐲 𝐏𝐚𝐫𝐚𝐦𝐞𝐭𝐞𝐫𝐬

Parameter | ValuePV Module Rating | 213.15 WSeries Modules | 10Parallel Strings | 47Open Circuit Voltage | 36.3 VVoltage at Maximum Power Point | 29 VShort Circuit Current | 7.84 AMaximum PV Power | 100.2 kWPV Voltage at Maximum Power | 290 V

𝐒𝐄𝐏𝐈𝐂 𝐂𝐨𝐧𝐯𝐞𝐫𝐭𝐞𝐫 𝐃𝐞𝐬𝐢𝐠𝐧

Parameter | ValueRated Power | 100.2 kWInput Voltage | 290 VOutput Voltage | 600 VSwitching Device | IGBTControl Method | MPPT Duty CycleMain Purpose | PV voltage regulation and power extraction

𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬

1. The PV array generates DC power based on the available solar irradiance.

2. The MPPT controller measures PV voltage and PV current.

3. The Incremental Conductance algorithm calculates the operating point of the PV system.

4. The duty cycle is adjusted to extract maximum power from the PV array.

5. The SEPIC converter boosts the PV voltage to the required DC link voltage.

6. The DC power is supplied to the Voltage Source Inverter.

7. The inverter converts DC power into synchronized AC power.

8. The LCL filter reduces current ripple before grid injection.

9. The generated solar power is successfully transferred to the grid.

𝐂𝐨𝐧𝐭𝐫𝐨𝐥 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐲

1. Incremental Conductance MPPT is used for maximum power tracking.

2. The MPPT controller generates the duty cycle for the SEPIC converter.

3. The SEPIC converter maintains the required boosted DC output.

4. The DC link voltage is compared with a 600 V reference.

5. A PI controller generates the active current reference.

6. The reactive current reference is set to zero.

7. The inverter control mainly injects real power into the grid.

8. PLL is used for grid voltage synchronization.

9. DQ transformation is used for inverter current control.

10. PWM pulses are generated for inverter switching.

𝐌𝐏𝐏𝐓 𝐋𝐨𝐠𝐢𝐜

Condition | Control ActionM value less than 0.05 | Maintain previous duty cycleVoltage and current changes are zero | MPP is reachedCurrent change is positive when voltage change is zero | Decrease duty cycleIncremental conductance condition matches MPP | Maintain duty cycleOperating point is away from MPP | Adjust duty cycle

𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬

Time Interval | Irradiance | PV Power0 to 0.4 s | 1000 W/m² | Approximately 100 kW0.4 to 0.8 s | 800 W/m² | Approximately 80 kW0.8 to 1.2 s | 500 W/m² | Approximately 50 kW1.2 to 1.6 s | 300 W/m² | Approximately 30 kW

𝐈𝐫𝐫𝐚𝐝𝐢𝐚𝐧𝐜𝐞 𝐕𝐬 𝐏𝐨𝐰𝐞𝐫 𝐎𝐮𝐭𝐩𝐮𝐭

Irradiance | Power Output1000 W/m² | 100.2 kW500 W/m² | 50.75 kW100 W/m² | 9.72 kW

𝐊𝐞𝐲 𝐎𝐛𝐬𝐞𝐫𝐯𝐚𝐭𝐢𝐨𝐧𝐬

1. Grid voltage and current remain sinusoidal.

2. PV output power reduces smoothly with lower irradiance.

3. Grid current amplitude changes according to PV power generation.

4. The SEPIC converter helps maintain the required DC link voltage.

5. MPPT control improves solar power extraction.

6. The inverter successfully transfers PV power to the grid.

𝐊𝐞𝐲 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬

1. MATLAB/Simulink model of grid-connected PV system.

2. SEPIC converter for DC voltage conversion.

3. Incremental Conductance MPPT for maximum power tracking.

4. VSI control with DQ transformation.

5. PLL-based grid synchronization.

6. LCL filter for improved grid current quality.

7. Simulation under multiple irradiance conditions.

8. Real power injection into the grid.

9. Suitable for renewable energy and power electronics study.

𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬

1. Solar PV system analysis.

2. Grid-connected renewable energy studies.

3. SEPIC converter control learning.

4. MPPT algorithm implementation.

5. Inverter control and grid synchronization study.

6. Power electronics simulation.

7. Renewable energy training and research.

8. MATLAB/Simulink-based system modeling.

𝐖𝐡𝐲 𝐓𝐡𝐢𝐬 𝐌𝐨𝐝𝐞𝐥 𝐈𝐬 𝐔𝐬𝐞𝐟𝐮𝐥

1. It explains the complete flow of solar power from PV array to grid.

2. It helps users understand SEPIC converter operation.

3. It shows how Incremental Conductance MPPT improves power tracking.

4. It demonstrates inverter control for grid-connected PV systems.

5. It helps analyze system behavior under changing irradiance.

6. It provides a clear simulation platform for learning and research.

𝐒𝐄𝐎 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬

Grid connected PV system in MATLAB, SEPIC converter MATLAB Simulink, Incremental Conductance MPPT, solar PV grid connection, 100 kW PV system, MATLAB solar PV model, grid connected inverter control, LCL filter MATLAB, renewable energy simulation, PV system with MPPT.

𝐂𝐨𝐧𝐜𝐥𝐮𝐬𝐢𝐨𝐧

The Grid Connected PV System With SEPIC Converter in MATLAB provides a clear and practical simulation model for studying solar PV generation, SEPIC converter control, MPPT operation, and grid-connected inverter performance.

The simulation results show that the system successfully transfers PV power to the grid under different irradiance conditions. As irradiance decreases, the PV power and grid current amplitude reduce smoothly, while the grid voltage and current remain sinusoidal.