A Dual Inverter Topology With Quasi-Isolated Power Supplies for More Electric Aircraft Applications

Open-end load system fed by the dual inverter (DI) is a promising technique for more electric aircraft (MEA) applications. Yet, two isolated power supplies preferred by the DI are hardly available in most MEAs. To address this issue, a novel DI topology with quasi-isolated power supplies is proposed in this letter. A simple nonisolated H-bridge boost converter is adopted to generate the second power supply and, moreover, to compensate for the load zero-sequence voltage generated by the DI. The operating principle and the applicability of the proposed DI topology are presented. Besides, a simple decoupled system control strategy is proposed. It is revealed that the proposed DI topology can generate a very high output voltage from the single power supply, while the load control performance is hardly affected by the zero-sequence current. This is a prominent advantage for MEA applications. The experimental results have verified the validity of the proposed topology.