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A grey wolf optimization-based modified SPWM control scheme for a three-phase half bridge cascaded multilevel
Abdelrahman M Nasser1,2, Amr Refky3, Hamdy Shatla3
1Department of Electrical Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt. abdelrahman.mohamed1@azhar.edu.eg.
Scientific Reports
|March 26, 2024
Summary
A new control scheme for Multilevel Inverters (MLI) in Photovoltaic (PV) systems simplifies control and reduces Total Harmonic Distortion (THD) to 6.8%. This innovation enhances renewable energy integration and power quality.
Area of Science:
- Electrical Engineering
- Renewable Energy Systems
- Power Electronics
Background:
- Multilevel Inverters (MLI) are crucial for converting DC from Photovoltaic (PV) sources to AC in renewable energy (RE) systems.
- Existing sinusoidal pulse width modulation (SPWM) schemes for MLIs can be complex due to numerous carrier signals.
- Efficient integration of PV systems into the grid requires advanced control strategies for optimal power generation.
Purpose of the Study:
- To present a modified sinusoidal pulse width modulation (SPWM) control scheme for a three-phase half-bridge cascaded MLI powered by PV sources.
- To simplify the control complexity and enhance the practical implementation of MLI systems.
- To optimize the performance of MLI-powered PV systems, focusing on reducing Total Harmonic Distortion (THD).
Main Methods:
- A modified SPWM control scheme requiring only three signals (carrier, triangular, modulating) was developed.
- The Grey Wolf Optimization (GWO) algorithm was employed to determine optimal switching angles for the MLI.
- Simulations were performed using MATLAB/SIMULINK, and results were compared with Particle Swarm Optimization (PSO) and Genetic Algorithm (GA).
Main Results:
- The proposed GWO-based modified SPWM control scheme significantly reduced Total Harmonic Distortion (THD) to 6.8%.
- The control scheme demonstrated improved performance compared to PSO and GA methods in simulation.
- Experimental validation using a laboratory prototype confirmed the simulation results, showing acceptable convergence.
Conclusions:
- The developed modified SPWM control scheme offers a simpler and more effective method for controlling MLI-powered PV systems.
- The GWO algorithm effectively optimizes switching angles, leading to superior output waveform quality (minimized THD).
- This approach contributes to the widespread adoption of renewable energy by enhancing the efficiency and reliability of PV integration.
Keywords:
GAGrey wolf optimization (GWO)Modified sinusoidal pulse width modulation (SPWM)Multilevel inverter (MLI)PSORenewable energy (RE)THDMore Related Videos
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