The conventional three-phase current reconstruction method for a three-phase inverter using a single dc-link current sensor reconstructs the three-phase currents by measuring the two-phase currents corresponding to the two active voltage vectors. However, the current measured by the sensor is not the average current. In addition, there is a current reconstruction dead zone (CRDZ) near the boundary of each sector. In this paper, we propose a novel current reconstruction strategy using two carriers that are inverted in phase with each other. This strategy compares the inverted carrier with the voltage references of one or two phases and compares the remaining phase voltage references with the non-inverted carrier. This allows us to measure the average current and significantly reduces the CRDZ to the corners of the space vector hexagon. The validity of the proposed method is verified by experimental results.
