High boosting type Z-source inverter/ improved Z-source inverter for solar photovoltaic system

In this paper, two topologies are presented for solar PV system, namely voltage lifting ZSI and voltage lifting Improved ZSI. These proposed inverters possess very high voltage boost. By replacing the middle diode in one of the switched inductor (SL) cell of SL-ZSI/2SL-qZSI with capacitor (CVL) high voltage gain can be obtained and also number of L, C and diodes gets reduced, which reduces weight, space and cost of the system. Very small shoot through duty cycle results in high voltage boost, thus efficiency can also be increased. Proposed topologies are analyzed in the steady state and their performances are validated using simulated results obtained in MATLAB/Simulink. This paper presents operating principles, analysis and simulation results, and compares them with SL-ZSI/2SL-qZSI.