Low voltage dc system design and implementation of 400 VDS optimizer

This thesis presents the design of a Low Voltage Direct Current (DC) system and a DC optimizer. Initially, a system simulation was established to evaluate the performance of a DC micro grid, and measurements were taken and analyzed. The Low Voltage DC voltage value is set at 400 VDC. Each photovoltaic panel in the system can operate at an output voltage of 400 VDC with the assistance of a DC optimizer. The DC optimizer, utilizing an interleaved flyback converter structure, generates the system bus bar value of 400 VDC with variable current. In the system design, sample loads were incorporated into the system simulation to test the power drawn directly from the common bus bar. Additionally, a DC-AC full bridge inverter was designed to facilitate power flow between the grid and the Low Voltage DC system. The DC-AC inverter employs a decoupling control structure to provide bidirectional real and reactive power control. The simulated DC optimizer was implemented and tested, achieving values of 220 W and 400 VDC.