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A Z-source inverter is a type of power inverter, a circuit that converts direct current to alternating current. It functions as a buck-boost inverter without making use of DC-DC converter bridge due to its unique circuit topology.
Impedance (Z-) Source networks provide an efficient means of power conversion between source and load in a wide range of electric power conversion applications (dc–dc, dc–ac, ac–dc, ac– ac) , . Z-source-related research has grown rapidly since it was first proposed in 2002 by Prof. F. Z. Peng. A comprehensive pulse width modulation scheme for Z-source inverters was proposed by Prof. P. C. Loh and Prof. D. M. Vilathgamuwa . The numbers of modifications and new Z-source topologies have grown exponentially. Improvements to the impedance networks by introducing coupled magnetics have also been lately proposed for achieving even higher voltage boosting, while using a shorter shoot-through time . They include the Γ-source, T-source, trans-Zsource, TZ-source, LCCT-Z-source (proposed in 2011 by Dr Marek Adamowicz and utilizing high frequency transformer connected in series with two dc-current-blocking capacitors) , high-frequency transformer-isolated, and Y-source  networks. Among them, the Y-source network (proposed in year 2013 by Dr Yam P. Siwakoti) is more versatile and can in fact be viewed as the generic network, from which the Γ-source, T-source, and trans-Z-source networks are derived . The incommensurate properties of this network open a new horizon to researchers and engineers to explore, expand, and modify the circuit for a wide range of power conversion applications.
Types of inverters
Inverters can be classified by their structure:
1. Single-phase inverter:
This type of inverter consists of two legs or two poles. (A pole is connection of two switches where source of one and drain of other are connected and this common point is taken out).
2. Three-phase inverter:
This type of inverter consists of three legs or poles or four legs (three legs for phases and one for neutral).
But, inverters are also classified based on the type of input source. And they are,
1. Voltage-source inverter (VSI)
2. Current-source inverter (CSI)
Typical inverters (VSI and CSI) have few disadvantages. They are listed as,
- Behave in a boost or buck operation only. Thus the obtainable output voltage range is limited, either smaller or greater than the input voltage.
- Vulnerable to EMI noise and the devices gets damaged in either open or short circuit conditions.
- The combined system of DC-DC boost converter and the inverter has lower reliability.
- The main switching device of VSI and CSI are not interchangeable.
Advantages of ZSI
The advantages of Z-source inverter are listed as follows,
- The source can be either a voltage source or a current source. The DC source of a ZSI can either be a battery, a diode rectifier or a thyristor converter, a fuel cell stack or a combination of these.
- The main circuit of a ZSI can either be the traditional VSI or the traditional CSI.
- Works as a buck-boost inverter.
- The load of a ZSC can either be inductive or capacitive or another Z-Source ntwrk.
. 'Power Electronics' by M Rashid.
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