Three-Phase Z-Source Power Supply Design and Dynamic Modeling

Z-source converter configurations make possible to overcome intrinsic limits present in conventional both ac-dc and dc-ac converters. A typical three-phase inverter can not supply output voltages greater than the voltages at its input; at the same manner, a typical three-phase boost-rectifier can not supply output voltages lower than input voltages. Using Z-source topology permits to overcome both these limits. In fact, a Z-source boost-rectifier can theoretically step-down the output voltage to any desired value. Additionally, it presents intrinsic immunity to shoot-through states, relaying to improved reliability of the entire system. In this paper, attention is focused on the mathematical modeling of a three-phase Z-source boost-rectifier for PFC power supply applications; where, using of such a topology as first-stage converter allows to design the second-stage converters with the same voltage constraints of single-phase units.