Multilevel Inverter Simulation with MATLAB Implementation

Multilevel inverters are power electronic devices widely used in high-voltage, high-power applications, capable of significantly reducing output voltage harmonic content and improving power quality. MATLAB simulation models provide an effective platform to study their operating principles and control strategies through programmable code implementations.

The multilevel inverter simulation model typically includes the following key components implemented in MATLAB/Simulink: Topology Structure: Common topologies include diode-clamped, flying capacitor, and cascaded H-bridge configurations. Each structure requires specific voltage balancing algorithms and switching control logic that can be programmed using MATLAB's Power Electronics Toolbox. PWM Modulation Strategies: Multilevel inverters commonly employ carrier-based modulation (such as SPWM) or space vector modulation (SVPWM) to control switching devices. Implementation involves generating modulation signals through mathematical algorithms and comparing them with triangular carrier waves using logical operations in MATLAB code. Control Loops: Voltage and current closed-loop control systems maintain output stability and suppress harmonic interference. These can be implemented using PID controllers with anti-windup protection and custom control algorithms written in MATLAB scripts.

The simulation model enables researchers to optimize modulation algorithms through parameter tuning, validate voltage balancing strategies using waveform analysis functions, and analyze dynamic responses under various load conditions. This provides theoretical foundation for actual hardware design while allowing code-based verification of control logic before physical implementation.