A Self Balancing Space Vector PWM for Z Source T Multilevel Inverter [articol]

Abstract

This paper presents a Z Source -T shape - Neurtal point Diode Clamped (NPC) - Multi Level Inverter (MLI) power conversion system (Z-T-NPC-MLI) with the aid of New Space Vector PWM (SVPWM) scheme. The proposed impedance source (Z-Source) MLI associations the advantages of boosting operations with DC to AC power conversions. There are many MLI Z-Source research papers for concentrating the desired voltage generations with minimal switching and conduction losses. Nevertheless, the reported research on Z-NPC-MLI SVPWM has dealt with reduction of Shoot through (ST) options and voltage boosting operations enhancement; those are does not address the neutral point fluctuation (NPF) problems on the DC-Link. This paper offers improved SVPWM strategies for Z- source NPC-MLI with minimal ST state options. The proposed SVPWM exploits the redundancy switching vector option for both ST and regular switching (non-ST), which offers self-control to NP (DC-link capacitor) balancing. With this benefit of this self- control DC-link capacitors balancing, the inverter able to maintain their output quarter symmetry waveform and henceforth the harmonic spectra for the voltage and current waveform is maintained lesser. The proposed SVPWM for Z-T-NPC-MLI is simulated in MATLAB/SIMULINK 2011.b software environment, and the results confirm the advantages of the proposed inverter and its simplified PWM scheme. The experimentation is also performed for 1kW three-phase Z-T-NPC-MLI system using sparten-6 FPGA processor. The experimental results are confirmed the simulation results.