What is it about?
This paper incorporates the simulation analysis of Cascade H-Bridge Multilevel Inverter (CHBMLI) with two different pulse width modulation techniques. One used a pure sinusoidal reference wave and the other used a third harmonic injected resultant reference wave. Both the reference signals operate under different amplitude modulation conditions which are Over Modulation, Linear Modulation and Under Modulations. The Cascade H-Bridge Multilevel Inverter has been simulated in MATLAB/Simulink to observe the performance parameters such as inverter output RMS line and phase voltages and currents. Also, the input DC voltage of the Cascade H-Bridge Multilevel Inverter has been varied to evaluate under which condition the inverter output line voltage is Standard Low Voltage level of Malaysia which is 400V for three phase system.
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Why is it important?
A critical aspect of utilizing multilevel structures is employing proper control and modulation techniques. The control system structure must be capable of handling a number of key issues, like voltage balancing and equal power loss sharing, which arise in multilevel topologies. Multilevel Pulse Width Modulation inverters have been gained importance in high performance power applications without requiring high ratings on individual devices, as static var compensators, drives and active power filters. A multilevel inverter divides the dc rail directly or indirectly, so that the output of the leg can be more than two discrete levels. As both amplitude modulation and pulse width modulation are used in this, the quality of the output waveform gets improved with low distortion. To achieve the desired output in multilevel inverters, pulse width modulation (PWM) techniques contribute a significant role and have been classed into low frequency switching and high frequency switching. The modulation techniques that categorized into low frequency switching are Selective Harmonic Elimination PWM (SHE-PWM), Nearest Vector Control PWM (NVC-PWM), Nearest Level Control PWM (NLC-PWM) and Switching Angle Control (SAC) while for high frequency switching modulation technique is Space Vector PWM (SVPWM) and Multi-Carrier PWM (MCPWM). However, the main challenge associated with the SHEPWM and SVPWM techniques is the complicated calculation required to control multilevel inverter above 5-levels.
Perspectives
In this paper a 5-level Cascade H-Bridge Multilevel Inverter has been simulated in MATLAB/Simulink environment and the performance of the inverter has been studied under different conditions by varying the input DC Voltage and the Amplitude Modulation of PD-SPWM and PD-THIPWM. From the results it is very clear that the power conversion efficiency of the Cascaded H-Bridge MLI is greater than 90%. and the results with PD-THIPWM shows that it has high output voltage magnitude [407.6-492.9V] and low total harmonic distortions [V: 13.97% - 17.26%] [I: 24.39% - 38.2%].
Syed Mohammed Uddin
University of Kuala Lumpur
Read the Original
This page is a summary of: Simulation analysis of Cascade H-Bridge multilevel inverter with PD-SPWM and PD-THIPWM, January 2023, American Institute of Physics,
DOI: 10.1063/5.0127763.
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