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CONTROL TO OUTPUT DYNAMIC RESPONSE AND EXTEND MODULATION INDEX RANGE WITH HYBRID SELECTIVE HARMONIC CURRENT MITIGATION-PWM AND PHASE-SHIFT PWM FOR FOUR-QUADRANT CASCADED H-BRIDGE CONVERTERS
CONTROL TO OUTPUT DYNAMIC RESPONSE AND EXTEND MODULATION INDEX RANGE WITH HYBRID SELECTIVE HARMONIC CURRENT MITIGATION-PWM AND PHASE-SHIFT PWM FOR FOUR-QUADRANT CASCADED H-BRIDGE CONVERTERS
A hybrid Cascaded H-Bridge (CHB) converter includes a selective harmonic current mitigation pulse width modulation (SHCM-PWM) unit coupled to an input current and providing an output signal SWSHCM, a phase shift pulse width modulation (PSPWM) unit coupled to the input current and providing an output signal SWPS, a modulation selector coupled to the output signal SWSHCM of the SHCM-PWM unit and the output signal SWPS of the PSPWM unit and providing an output signal SW, and a CHB converter coupled to the output signal SW of the modulation selector. The modulation selector can select one of the output signals (SWSHCM and SWPS) as the output signal SW based on the input current. The hybrid technique is for cascaded multilevel converters which utilizes asymmetric SHCM to mitigate the harmonics generated from PS-PWM to meet harmonic limits with a smaller number of switching transitions and smaller inductance than the conventional PS-PWM technique.
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