01-03-2013, 11:02 AM
Maximum boost control of the Z-source inverter
ABSTRACT
Minor modifications in the traditional three phase sinusoidal PWM technique will yield various PWM control strategies for the QZSI. There are three available PWM control strategies for QZSI. Traditionally, they are three control methods.
a. simple boost control
b. maximum boost control
c. maximum constant boost control.
Maximum boost control turns all traditional zero state into shoot trough state. The voltage stress across the switching device is greatly reduced by fully utilizing the zero state. However, doing so also causes a shoot through duty ratio varying in a line cycle, which causes inductor current ripple. This will require a high inductance for low frequency or variable frequency applications.