Z Source Inverter Thesis

Z Source Inverter Thesis-73
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.In addition, the dynamic properties of the ZSI-based PV inverter was compared to single and two-stage VSI-based inverters.

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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.

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).

When used with Ga N devices operating at very high frequency, the q ZS network impedance can be significantly reduced. The asymmetric impedance network (AIN-q ZSI) has several advantages such as increased power density, increases system lifetime, small size volume and size making it more attractive for module integrated converter (MIC) concepts. With asymmetric component, resonance is introduced in the system leading to more losses and audible noise.

With small inductances, new operation states become available further increasing the system complexity.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.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).It is concluded that a feedback loop that adjusts the shootthrough duty cycle should be used to regulate the input voltage of the inverter.Under input voltage control, there is no tradeoff in between the parameters of the impedance network and impedance network capacitor voltage control bandwidth.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.This report investigates the AIN-q ZSI and present solutions to aforementioned issues.Solar energy has been the most popular sources of renewable energy for residential and semi-commercial applications.


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