Ultra Robust 1MHz Multi-sampling Deadbeat Control for Megawatt-Class Grid-tied Multi-level Inverter with LC type Output Filter Configuration using C-HIL

The growing interest in distributed power generation systems, which use clean and renewable energy sources, grid-tied inverter systems are widely introduced to the grid. Downsize of the system and cost-effective solution is required to the main circuit configuration. It involves using only an LC filter in the equipment and utilizing the existing transformer on the facility side as the interconnecting reactor. Traditionally, a control system in such configuration was implemented based on PI control. However, to improve the control performance, especially under various grid disturbance conditions like FRT (Fault Ride Through), a deadbeat control technique based on a 1 MHz multisampling for low carrier frequency is proposed. The effectiveness of the proposed method is demonstrated through Real Time simulation with C-HIL (Controller Hardware in the Loop) configuration, superior characteristics were verified.