Z Source Inverter Thesis

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A 3.3 k W MZSI has been designed and simulated using PLECS. The peak efficiency of 94% was observed under irradiation and temperature changes.

A scaled-down version of the proposed topology has been implemented for proof of concept.

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).

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.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.According to the results presented in this thesis, the small-signal characteristics of a photovoltaic generator-fed and a conventional voltage-fed ZSI differs from each other.The derived small-signal model was used to develop deterministic procedure to design the control system of the inverter.Due to the inevitable depletion of fossil fuels and increased awareness of their harmful environmental effects, the world energy sector has been moving towards extensive use of renewable energy resources, such as solar energy.In solar photovoltaic power generation, the needed interface between the source of electrical energy, i.e., a photovoltaic generator, and electrical energy transmission and distribution systems is provided by power electronic converters known as inverters.Also the small mismatch in the impedance network parameters do not compromise the performance of the inverter.These phenomena will remain hidden if the effect of the photovoltaic generator is not taken into account.The single stage Quasi-Z-Source Inverter (q ZSI) is also able to draw continuous and constant current from the source making ideal for PV applications in addition to allowing shoot-through states.The q ZSI find best applications in medium level ranges where multiples q ZS inverters can be cascaded (q ZS-CMI) by combining the benefit of the q ZSI, boost capabilities and continuous and constant input current, and those of the CMI, low output harmonic content and independent MPPT.


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