Modified FBDC Bypass Grid-Tied Inverter for Operating at Double The Switching Frequency

The distributed power generation system offers many advantages in utilizing renewable energy resources for the generation of power. While integrating the system it is essential to maintain the quality of power that will be injected into the grid. The power quality can be improved by decreasing the total current harmonic distortion. The harmonic distortion can be reduced by designing a filter for the required standard, increasing the number of levels or by increasing the switching frequency. As switching frequency directly related to the switching stresses that a power device must be capable of it essential to switch to topologies or algorithm that are capable of working at lower switching frequency. This paper presents a modified full-bridge direct current bypass topology for improving the power quality while reducing the switching stress on the power devices. The inverter outputs a sine pulse width modulated signal that is double the operating frequency of the inverter. The diodes in the FBDC bypass inverter are replaced with IGBTs to give better efficiency. The topology presents a leakage current of 9 mA and the total harmonic distortion at the output of the inverter under no grid condition is 0.36%.