Abstract
Z-source inverter has recently been introduced to overcome the limitations of conventional voltage source inverter. This paper deals with a novel topology of single-phase Z-source inverter (ZSI). This topology reduced the number of passive elements and active switches in order to make the inverter cheaper and smaller in size compared to traditional ZSI. Detailed analysis of the proposed topology is presented in this paper which includes calculations of boost factor, total harmonic disorder, magnitude of output voltage etc. Modulation technique used to control the switching of the proposed inverter is explained in detail. This paper also compares the proposed topology with conventional topologies of Z-source inverter. Simulation results of MATLAB and real-time simulators are shown to explain the working of the proposed topology.
Highlights
Z-source inverter (ZSI) has many advantages over conventional voltage source inverters in terms of reliability, efficiency, cost etc
To carry out the boost operation, ZSI uses an additional state called shoot-through state in which both switches of the same-phase leg are turned on simultaneously. This shoot-through state is not possible in conventional VSI as it may damage the inverter. This property of ZSI to use shoot-through state makes it more reliable compared to the conventional VSI
Researchers have proposed many topologies which make use of less number of passive elements. One of these topologies is switched boost inverter which significantly reduced the number of passive elements but an additional switch is required for the operation of this inverter, which makes its control a bit complex and with the increase in the number of semiconductor devices, the inverter circuit requires better protection compared to traditional ZSI [2]
Summary
Z-source inverter (ZSI) has many advantages over conventional voltage source inverters in terms of reliability, efficiency, cost etc It uses a unique LC-impedance network to join the inverter with the power source [1]. Researchers have proposed many topologies which make use of less number of passive elements One of these topologies is switched boost inverter which significantly reduced the number of passive elements but an additional switch is required for the operation of this inverter, which makes its control a bit complex and with the increase in the number of semiconductor devices, the inverter circuit requires better protection compared to traditional ZSI [2]. Modulation technique used for the switching of the inverter is quite simple and is explained in detail in this paper
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