Abstract
Z-source inverter refers to a DC-AC converter that is unique in various ways. It consists of a companion of the regular voltage source inverter and Z-source impedance that acts as Buck-Boost converter. The DC-DC boosting leads to the Z-source having the buck-boost converter properties, rather than having two separate devices. In this design, the system is simplified by having one device that can do both the DC-DC boosting and DC-AC conversion. It also has the voltage source properties. The Z-source is said to be a three-phase inverter. In this design, an SPWM technique will be used to control the switches in order to generate the sinusoidal waveform. The SPWM technique compares three sine waves with a 120-degree phase shift with a triangle waveform. To simulate the SPWM signal that is required, Matlab software is used. The comparison result is sent to the microcontroller on comparing the sine wave with a triangle wave in Matlab. This step is used to help in simplifying the circuit and also in producing noiseless SPWM signal. The SPWM signal is produced by the Arduino, and the microcontroller that is connected to the Mosfet Driver boosts the output current. Mosfet switches have been used for DC-AC converter. In this design, a protection mechanism to cut off the power supply when one of the phases is disconnected is used. A BJT transistor switch is used to control the relays by being energized and, thereby, cutting off the power on one of the phases being disconnected.
Key Words: Z-source inverter, three phase inverter, SPWM technique, Z-source impedance, Protection mechanism.
