MATLAB Model  Grid Connected PV System with Five Level Multilevel Inverter
 
The MATLAB Grid Connected PV System with Five Level Inverter is a complete simulation model designed for advanced analysis of solar energy integration with the electrical grid. This model combines a photovoltaic (PV) array, boost converter with P&O MPPT, and a five-level multilevel inverter to achieve efficient DC–AC conversion and maximum power extraction.
This grid connected PV system MATLAB model ensures stable DC-link voltage regulation and delivers high-quality AC output with reduced harmonic distortion. The use of a five level multilevel inverter MATLAB simulation significantly improves waveform quality compared to conventional inverters, making it suitable for power quality and harmonic analysis studies.
The system includes PLL-based grid synchronization, PI and PR controllers, and an LCL filter to ensure smooth and synchronized power injection into the grid with unity power factor. It dynamically responds to varying irradiance conditions, making it ideal for real-time solar energy performance evaluation.
 
This MATLAB PV system with multilevel inverter is widely useful for renewable energy research, power electronics design, microgrid studies, and EV charging system development. It helps users understand MPPT techniques, inverter control strategies, and grid integration challenges in a practical simulation environment.
Perfect for engineers, researchers, and students, this model provides a reliable platform to study grid connected solar PV systems with multilevel inverter technology and enhance system efficiency, stability, and performance.
 
The system uses a two-stage conversion topology:
 
DC-DC Boost Converter with MPPT
Five-Level Inverter for Grid Integration
 
The model is designed for renewable energy research, power electronics studies, and microgrid applications.
 
📌 The PV energy is extracted using Perturb & Observe (P&O) MPPT and injected into the grid with unity power factor and low THD.
 
🔷 Key Features
 
✅ Two-stage PV conversion (Boost + Multilevel Inverter)
✅ Five-level output waveform for reduced harmonics
✅ P&O MPPT for maximum power extraction
✅ PI + PR control strategy
✅ Grid synchronization using PLL
✅ LCL filter for harmonic reduction
✅ Low THD (~3%) compliant with IEEE standards
✅ Dynamic irradiance variation testing
✅ Unity power factor operation
 
🔷 Technical Specifications
 
🔸 PV System
Panel rating: ~350 W per module
Number of panels: 6 (series connected)
Total power: ~2.1 kW
Voltage (per panel): ~43 V
Current: ~8.13 A
PV array voltage: ~258 V
 
🔸 DC-DC Boost Converter
Input voltage: ~258 V
Output (DC link): ~400 V
Control: PI controller + PWM
MPPT algorithm: P&O
 
🔸 Five-Level Multilevel Inverter
Type: Reduced switch topology
Number of switches: 5 IGBTs
Output levels:
+Vdc
+Vdc/2
0
–Vdc/2
–Vdc
Control:
Voltage loop → PI controller
Current loop → PR controller
 
🔸 Grid Parameters
Grid voltage: 230 V RMS
Frequency: 50 Hz
Peak voltage: 325 V
Synchronization: PLL
 
🔸 Filter
Type: LCL filter
Purpose: Harmonic reduction and smoothing
 
🔸 Performance Metrics
DC-link voltage: ~400 V (regulated)
Output waveform: Five-level stepped AC
THD: ~3% (within IEEE limits)
Power factor: Unity
 
🔷 Control Strategy
 
🔹 MPPT Control
Uses PV voltage & current
Adjusts reference voltage dynamically
Tracks maximum power under varying irradiance
 
🔹 Inverter Control
PLL generates phase angle
PI controller → voltage regulation
PR controller → current shaping
Ensures:
Grid synchronization
Sinusoidal current injection
 
🔷 Working Principle
PV array generates DC power
Boost converter:
Tracks MPP
Increases voltage to DC-link level
Five-level inverter:
Converts DC → AC
Produces stepped waveform
LCL filter:
Removes harmonics
Power injected into grid:
Voltage & current in-phase
Ensures unity power factor
 
🔷 Simulation Conditions
0 – 0.5 s → 1000 W/m²
0.5 – 2 s → 100 W/m²
2 – 3.5 s → 1000 W/m²
 
👉 System dynamically adapts and maintains stability under irradiance changes.
 
🔷 Use Cases
 
🔸 Academic & Research
Power electronics and renewable energy studies
Multilevel inverter analysis
MPPT algorithm comparison
Grid integration studies
 
🔸 Industrial Applications
Solar power plants
Grid-connected rooftop PV systems
Smart grid integration
Distributed generation systems
 
🔸 Advanced Applications
EV charging stations with PV integration
Microgrid and hybrid energy systems
Power quality improvement studies
Harmonic analysis and mitigation
 
🔷 Advantages
✔ Reduced harmonic distortion
✔ Improved efficiency
✔ Better voltage waveform quality
✔ Lower switching stress
✔ High-quality grid power injection