Z Source Inverter Thesis

Z Source Inverter Thesis-73
This report investigates the AIN-q ZSI and present solutions to aforementioned issues.

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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 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.

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).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.In addition, it is shown that the settling time of the system, which determines the maximum power point tracking performance, is similar to two-stage VSI-based inverter.The control of the ZSI-based PV inverter is more complicated than the control of the VSIbased inverter.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.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.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.

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