Series Resonant Current Source High-frequency Link Inverter Grid Connection Technology Based on Model Predictive Control

This paper proposes a novel series resonant grid-connected high-frequency link inverter, which can achieve DC-AC conversion and bidirectional energy flow in a single stage. It enables full-range soft switching regardless of load characteristics and fundamentally resolves the issue of switching commutation voltage spikes caused by transformer leakage inductance in cycloconverters. The working principle of the circuit is detailed, and a multi-step model predictive control (MPC) scheme is proposed. By controlling the combination of three resonant models, precise modulation of the resonant current amplitude can be achieved, while avoiding control errors caused by computational delays and the loss of soft switching. Finally, this study used Simulink simulation software to construct a 100kHz, 440W circuit model, aiming to verify whether the circuit's output performance meets the design specifications and to assess the effectiveness of the control system. The simulation results indicate that the circuit output adequately satisfies grid-tied requirements, exhibits low total harmonic distortion (THD), and achieves full-range zero-current switching (ZCS) capability.