Z Source Inverter Thesis

Z Source Inverter Thesis-50
Photovoltaic generators have been shown to affect the behavior of the interfacing power converters but these issues have not been studied in detail thus far in case of ZSI.In this thesis, a consistent method for modeling a three-phase grid-connected photovoltaic ZSI was developed by deriving an accurate small-signal model, which was verified by simulations and experimental measurements by means of a small-scale laboratory prototype inverter.However, with the model presented in this thesis, it is possible to guarantee that the performance of the inverter resembles the behavior of the two-stage VSI, i.e.

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Solar energy sources alone cannot be used to charge an electric vehicle (EV).

Solar/Grid interconnected charging stations are used to charge EV batteries to reduce the dependency on the grid and enable charging at convenient locations such as a residential garage or a parking lot right next to an office or a shopping mall.

However, the continuous optimization and improvements in the production process of Si to meet today technology requirements have pushed Si materials to their theoretical limits.

In an effort to find a suitable replacement, wide bandgap devices mainly Gallium Nitride (Ga N) and Silicon Carbide (Si C), have proved to be excellent candidates offering high operation temperature, high blocking voltage and high switching frequency; of which the latter makes Ga N a better candidate in high switching low voltage in Distributed Generations (DG).

The operation of the proposed topology was verified.

The proposed topology reduces the number of conversion stages to charge EVs from a Smart Grid/PV interface (high efficiency).

The Z-source inverter (ZSI) topology achieves voltage boost and DC-AC power conversion in a single stage.

In this thesis, the design and implementation of a modified ZSI (MZSI) based charging topology for PV/EV/Grid interconnected application has been presented.

In addition, the dynamic properties of the ZSI-based PV inverter was compared to single and two-stage VSI-based inverters.

It is shown that the output impedance of ZSI-based inverter is similar to VSI-based inverter if the input voltage control is designed according to method presented in the thesis.


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