Modeling of Single-Phase Semi-Z-source Inverter
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2013, Vol 2, Issue 9
Abstract
This paper presents several single-phase non-isolated semi-Z-source inverters for small distributed power generator in grid-connected applications with low cost and doubly grounded features. These semi-Z-source inverters employ the Zsource/quasi-Z-source network and only two active switches to achieve the same output voltage as the traditional voltage-fed full-bridge inverter. The two active switches of the semi-Zsource inverter are controlled complementarily. Different from the traditional single-phase Z-source/quasi-Z-source inverter, shoot-through zero state is not applicable for the semi-Z-source inverter. The input dc source and the output ac voltage of the semi-Z-source inverter share the same ground, thus leading to less leakage ground current advantages over other non-doubly grounded inverters, such as voltage fed full-bridge inverter. This is a preferred feature for non-isolated grid-connected inverters especially in photovoltaic application. A revised non-linear sinusoid pulse width modulation method for semi-Z-source inverter is also proposed. By using this method, desired duty cycle can be generated to output the sinusoidal voltage. Other dc-dc converters with similar voltage gain curve, which can also be used as a single-phase inverter are also discussed and summarized. A single-phase semi-Z-source inverter prototype is built, experimental results are provided to verify and demonstrate the special features of the proposed circuit.
Authors and Affiliations
Tejasri G, SK Sadik Ahamad Khan, Firozali Mohammed, Anyam Naresh
Keywords
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