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, comprising:

• 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, based on if the input current satisfies a third predetermined condition or a fourth predetermined condition.

A four-quadrant Cascaded H-Bridge (CHB) converter, comprising:

• a selective harmonic current mitigation pulse width modulation (SHCM-PWM) unit receiving an active power and a reactive power from a power grid;
• a phase shift pulse width modulation (PSPWM) unit receiving the active power and the reactive power from the power grid;
• and
• a CHB converter selectively coupled to the SHCM-PWM unit at steady state and the PSPWM unit at transient state.

A hybrid Cascaded H-Bridge (CHB) converter, comprising:

• 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;
• and
• a CHB converter selectively coupled to the SHCM-PWM unit and the PSPWM unit;
• wherein the CHB converter is coupled to the SHCM-PWM unit under steady state condition and the CHB converter is coupled to the PSPWM unit under dynamic condition;
• and
• wherein the input current includes an active current reference ΔI*in-d and a reactive current reference ΔI*in-q, and the CHB converter is selectively coupled to the SHCM-PWM unit and the PSPWM unit based on the active current reference ΔI*in-d and the reactive current reference ΔI*in-q.