𝐌𝐀𝐓𝐋𝐀𝐁 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐆𝐫𝐢𝐝 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐞𝐝 𝐏𝐕 𝐒𝐲𝐬𝐭𝐞𝐦 𝐰𝐢𝐭𝐡 𝐒𝐄𝐏𝐈𝐂 𝐂𝐨𝐧𝐯𝐞𝐫𝐭𝐞𝐫

𝐌𝐀𝐓𝐋𝐀𝐁 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐆𝐫𝐢𝐝 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐞𝐝 𝐏𝐕 𝐒𝐲𝐬𝐭𝐞𝐦 𝐰𝐢𝐭𝐡 𝐒𝐄𝐏𝐈𝐂 𝐂𝐨𝐧𝐯𝐞𝐫𝐭𝐞𝐫

Product Link: https://www.lmssolution.net.in/product-page/grid-connected-pv-system-with-sepic-converter-in-matlab

𝐈𝐧𝐭𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧

A grid connected PV system with SEPIC converter is an important simulation topic for students, researchers, and engineers working in renewable energy, power electronics, and MATLAB/Simulink.

Grid Connected PV System With SEPIC Converter in MATLAB

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This model demonstrates how solar power generated by a PV array is:

• extracted using Incremental Conductance MPPT

• processed through a SEPIC converter

• regulated at the DC link

• injected into the utility grid through a voltage source inverter

• 
  

This simulation is useful for learning the complete working of a 100 kW class solar PV grid integration system under changing irradiation conditions.

𝐒𝐲𝐬𝐭𝐞𝐦 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

The developed MATLAB/Simulink model includes the following main sections:

• PV array

• SEPIC converter

• Incremental Conductance MPPT controller

• DC link

• Voltage Source Inverter

• LCL filter

• Grid connection

• PLL and dq control system

• Feedforward decoupling current controller

Main purpose of the system:

• extract maximum power from the PV array

• regulate the DC-link voltage

• convert DC power into AC power

• inject real power into the grid with proper control

𝐏𝐕 𝐀𝐫𝐫𝐚𝐲 𝐃𝐞𝐭𝐚𝐢𝐥𝐬

Parameter	Value
Single panel power	213.15 W
Open circuit voltage	36.3 V
Voltage at maximum power point	29 V
Short circuit current	7.84 A
Current at maximum power point	7.35 A
Series modules	10
Parallel strings	47
Approximate system capacity	100.2 kW

𝐏𝐕 𝐂𝐡𝐚𝐫𝐚𝐜𝐭𝐞𝐫𝐢𝐬𝐭𝐢𝐜𝐬

Irradiation	PV Power	Operating Voltage
1000 W/m²	100.2 kW	290 V
500 W/m²	50.75 kW	293.3 V
100 W/m²	9.72 kW	280.2 V

𝐒𝐲𝐬𝐭𝐞𝐦 𝐎𝐭𝐡𝐞𝐫 𝐊𝐞𝐲 𝐕𝐚𝐥𝐮𝐞𝐬

Parameter	Value
SEPIC input voltage	Around 290 V
SEPIC output / DC-link reference voltage	600 V
Grid voltage	400 V
Grid frequency	50 Hz

𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬

The working process of this system can be understood in simple steps:

1. The PV array generates DC power based on solar irradiation.

2. The PV voltage and current are measured continuously.

3. The Incremental Conductance MPPT processes these signals and generates the required duty cycle.

4. The duty cycle is compared with a sawtooth waveform to create the switching pulse.

5. This pulse controls the IGBT of the SEPIC converter.

6. The SEPIC converter boosts and regulates the PV-side output to the required 600 V DC-link.

7. The voltage source inverter converts DC power into AC power.

8. The inverter output passes through an LCL filter.

9. The filtered power is injected into the 400 V, 50 Hz grid.

10. The controller ensures proper real power transfer from PV to grid.

𝐂𝐨𝐧𝐭𝐫𝐨𝐥 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐲

This system uses two important control sections:

1) Incremental Conductance MPPT

The MPPT controller:

• measures PV voltage and PV current

• checks the change in voltage, current, and power

• decides whether the PV system is operating at the maximum power point

• updates the duty cycle when needed

• keeps the duty cycle unchanged when the maximum power point is reached

• checks duty cycle within the minimum and maximum limits

Benefit:

• better tracking of the maximum power point

• improved power extraction during changing irradiation

2) Grid Side Control

The inverter is controlled using feedforward decoupling control.

This section:

• measures the DC-link voltage

• compares it with the 600 V reference

• uses a PI controller to generate the d-axis current reference

• sets the q-axis current reference to zero

• converts measured current into dq components

• uses PLL to obtain the required synchronization angle

• generates the inverter switching pulses using inverse Park transformation and PWM comparison

Benefit:

• stable DC-link voltage

• synchronized grid power injection

• real power transfer from PV to grid

𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬

The simulation is tested under changing irradiation conditions.

𝐈𝐫𝐫𝐚𝐝𝐢𝐚𝐭𝐢𝐨𝐧 𝐏𝐫𝐨𝐟𝐢𝐥𝐞

Time Interval	Irradiation
0 to 0.4 s	1000 W/m²
0.5 to 0.8 s	800 W/m²
0.9 to 1.2 s	500 W/m²
1.3 to 1.6 s	300 W/m²

𝐎𝐛𝐬𝐞𝐫𝐯𝐞𝐝 𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐞𝐬

Condition	Observed Result
1000 W/m²	PV power is around 100 kW
800 W/m²	PV power drops to around 80 kW
500 W/m²	PV power reduces to around 50 kW
300 W/m²	PV power reduces further due to lower irradiation
Grid voltage and current	Sinusoidal nature is observed
Grid current amplitude	Reduces as PV power decreases
Grid power	Follows the reduction in PV generation

Key result summary:

• the system tracks power effectively under changing irradiation

• the converter and MPPT work together to extract available solar power

• the inverter successfully sends the available PV power to the grid

• the current injected into the grid changes according to PV power level

• 
  

𝐊𝐞𝐲 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬

• MATLAB/Simulink based complete model

• Grid connected PV system architecture

• SEPIC converter based DC-DC stage

• Incremental Conductance MPPT

• 600 V DC-link regulation

• Voltage source inverter with dq control

• PLL based synchronization

• LCL filter for grid interfacing

• Performance under variable irradiation

• Clear understanding of PV-to-grid power flow

𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬

This simulation can be used for:

• academic learning in solar energy systems

• research work in MPPT and grid integration

• power electronics studies

• renewable energy control analysis

• grid-connected inverter design understanding

• converter and inverter control validation

• training and demonstration purposes

𝐖𝐡𝐨 𝐂𝐚𝐧 𝐔𝐬𝐞 𝐓𝐡𝐢𝐬 𝐌𝐨𝐝𝐞𝐥?

• Students who want to understand grid-connected PV operation

• Researchers working on MPPT and converter control

• Engineers studying inverter-grid interfacing

• Trainers and institutions looking for a practical MATLAB simulation example
  

𝐂𝐨𝐧𝐜𝐥𝐮𝐬𝐢𝐨𝐧

This MATLAB Simulation of Grid Connected PV System with SEPIC Converter is a useful and practical model for understanding how a solar PV system can be connected to the grid with proper control.

With the support of:

• PV array modeling

• Incremental Conductance MPPT

• SEPIC converter

• DC-link voltage regulation

• dq current control

• grid synchronization

  
  

the system demonstrates effective solar power extraction and smooth grid power injection under varying irradiation conditions.

If you are looking for a clear and educational MATLAB/Simulink model for grid-connected solar PV systems, this topic is highly valuable for study, analysis, and implementation.

Keywords: MATLAB simulation, grid connected PV system, SEPIC converter, incremental conductance MPPT, solar PV Simulink model, grid tied inverter, PV power control, renewable energy simulation