Analysis of the single-phase photovoltaic grid-connected cascaded H-bridge multilevel inverters

The technology of multilevel inverters has appeared as a significant alternate in the high power energy at medium voltage region. The cascaded H-bridge (CHB) rectifier configuration is appropriate for random numbers of series bridges with various levels of voltages and powers. This paper offer a single phase three levels and nine levels photovoltaic (PV) inverter topology that can be applied for PV systems of grid connecting to a normal pulsed width modulating (PWM) controlled system. The simulation of MATLAB based on Simulink have been presented for total harmonic distortions (THD) for output signals and the output phase of voltage and current in addition to PWM signal for IGBT. The designed system is confirmed through simulation that THDs may be reduced within increased level numbers and this certifies a suggested controlling approach.