Integrating Dual-Channel Data into the d-q Frame for Talkative Power Converters in Three-Phase AC Systems

Talkative power converters (TPCs), capable of simultaneous power conversion and data modulation, have emerged as a hardware-minimized communication solution for power electronic systems. Although TPCs have been extensively studied in DC systems, their implementation in three-phase AC systems remains underexplored. This paper proposes a novel dual-channel decoupled data modulation, which enables three-phase DC/AC TPCs to realize data interaction using two independent communication channels through power cables. The cross-axis coupling issue between the data transmitter and receiver is analyzed using a TPC communication model. To solve the problem, an adaptive estimation strategy is proposed to estimate and eliminate the coupling for each data frame. The proposed solution can be seamlessly deployed as a software upgrade compatible with existing three-phase inverters. Finally, experimental validation is conducted on a 3.3 kW AC microgrid comprising three grid-forming inverters, demonstrating the effectiveness and practical feasibility of the proposed approach.