2ω power ripple analysis of PV fed single-phase QZSI using symmetrical shoot through control

Like a single phase traditional inverter, the 1φ quasi-Z source inverter (qZSI) faces the problem of double line frequency (2ω) power ripple which has the frequency of 100Hz. 2ω power ripple creates serious issues in the case of PV or fuel cell sources. Low frequency ripple reduces the overall performance of a system by reducing its power quality as well as by reducing the lifespan of the applied sources (PV/ fuel cells). For minimizing the low frequency ripple, the first step is to identify the percentage of 2ω power ripple. Symmetrical shoot through (SST) is one of the novel carrier controls introduced for grid-tied PV based 1φ qZSI to investigate the percentage of 2ω power ripple. This paper also gives the detailed analysis of 2ω power current and voltage ripple. The simulation results are obtained for grid current control as well as capacitor voltage control using MATLAB. From simulation results, the low frequency power ripple calculations are performed using a systematic formula.