Three-phase Four-leg Inverter LC Filter Using FCS MPC

The need to convert electric power from dc to ac is due to the growing development of renewable energy generation connected to an electric power distribution system. The power conversion is carried out with power inverters where a three-phase four-leg inverter, apart from being an electric power converter, turns out to stabilize the output voltage supplied to the load. The voltage on the distribution network can experience imbalance due to connection with an unbalanced three-phase load. This article presents a four-leg three-phase inverter using an LC filter using an MPC control to produce a sinusoidal output voltage and balance the voltage. From the simulation results, it is obtained that when the load is balanced, the THD of the output voltage is 0.3% - 0.5%, while in unbalanced load conditions, the THD of the output voltage is 0.2% - 1.7%, with a percentage of voltage imbalance of 0.1% - 0.9%.