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

摘要

A hybrid Cascaded H-Bridge (CHB) converter can include a selective harmonic current mitigation pulse width modulation (SHCM-PWM) unit coupled to an input current and providing an output signal SW_SHCM, a phase shift pulse width modulation (PSPWM) unit coupled to the input current and providing an output signal SW_PS, a modulation selector coupled to the output signal SW_SHCM of the SHCM-PWM unit and the output signal SW_PS 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 (SW_SHCM and SW_PS) as the output signal SW based on the input current.