Single-Phase to Split-Phase Inverters with Grid Support Functions for Grid-Interactive Applications

This paper presents a cost-effective single-phase to split-phase inverter with a reduced switch count, achieving grid-interactive performance while maintaining operational efficiency. The proposed system integrates an Andronov-Hopf oscillator-based secondary controller, which inherently embeds a nonlinear resistive droop architecture, ensuring rapid dynamic response. A Lyapunov energy function-based primary control enhances transient stability and regulation, while an internal model-based point of common coupling voltage estimation enables cost reduction without additional sensors. Equipped with advanced grid support functionalities, the inverter facilitates seamless distribution system operation with enhanced robustness. The effectiveness of the proposed architecture and control strategy is validated through MATLAB/Simulink and PLECS simulations, demonstrating its feasibility for high-performance grid-supportive applications.