Performance Improvement of Grid-Tied Cascaded H-Bridge Inverter Using Advanced Single-Carrier PWM Scheme

Grid-tied solar photovoltaic (PV) systems are becoming increasingly prevalent as a result of recent advancements and the popularity of solar photovoltaic panels. The control strategy used has a significant impact on these systems’ dependability and performance. In order to link PV systems to medium-voltage grids, this paper presents a seventh harmonic injected single carrier pulse width modulation (SHISCPWM) technique for a cascaded H-bridge (CHB) inverter. In contrast to the stablished phase disposition PWM (PDPWM) method, the suggested SHISCPWM generates gate pulses in the CHB by utilizing only a single carrier and a seventh harmonic saturated signal. On digital signal processor (DSP)/ field programmable gate array (FPGA) platforms, this innovative SHISCPWM technique eases implementation and lessens computational load. However, the goal of the proposed SHISCPWM is to guarantee the thermal stability of junction temperature of the power semiconductor devices. Again, the SHISCPWM seeks to minimize the total harmonic distortion (THD) of CHB inverter, which will result in lower semiconductor power losses and higher efficiency. In addition to optimizing DC bus consumption, the proposed SHISCPWM reduces switching and conduction losses.