Eliminating leakage currents in transformerless Z-source inverters for photovoltaic systems

This paper presents a new pulse-width modulation that allows the three-phase Z-source inverter photovoltaic system operate without transformer and assuring very low leakage currents. Furthermore, a proper switching pattern is chosen in order to assure a reduced number of commutations, leading to reduced switching losses in the inverter. Experimental results of the three-phase Z-source inverter connected to a RL load are obtained to validate the theoretical models.