Z Source Inverter: Topology Improvements Review
One of the most promising power electronics converter topologies is the Z source inverter (ZSI) The ZSI is an emerging topology for power electronics dc ac converters with interesting properties such as buck boost characteristics and single stage conversion. A two port network, composed of two capacitors and two inductors connected in an X shape, is employed to provide an impedance source (Z source) network, coupling the inverter main circuit to the dc input source. The ZSI advantageously uses the shoot through (ST) state to boost the input voltage, which improves the inverter reliability and enlarges its application fields. In comparison with other power electronics converters, it provides an attractive single stage dc ac conversion with buck boost capability with reduced cost, reduced volume, and higher efficiency due to a lower component number. For emerging power generation technologies, such as fuel cells, photovoltaic (PV) arrays, and wind turbines, and new power electronic applications such as electric and hybrid vehicles, the ZSI is a very promising and competitive topology [1] [4]
IEEE Industrial Electronics Magazine