This paper presents a new control method for Quasi-Z-Source cascade multilevel inverter based on ... more This paper presents a new control method for Quasi-Z-Source cascade multilevel inverter based on Grid connected Single phase photovoltaic power system. The control system enables the voltage boost of a PV string to a higher level and produces a balanced DClink voltage in H-bridge inverters. A novel Space vector modulation for QZS-CMI is presented to control the shoot through states independently and synthesize a staircase output voltage waveform. The system achieves independent Maximum power point tracking for separate PV arrays, independent DC-link voltage and the grid injected power control at unity power factor. A Fuzzy logic control scheme is developed to PV array voltage control loop, it adjusts the sum of pv arrays to track its reference value with reduced transients.. The system demonstrates stable output voltage with reduced total harmonic distortion. The proposed system components are modeled and simulated through software tool using MATLAB/SIMULINK.
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Papers by Raveena Sowmya