Dead-time compensation strategy for power quality enhancement in high-frequency link matrix converters for energy storage systems

High-Frequency Link Matrix Converters (HFLMCs), which feature both high efficiency and high power density, hold great promise in bidirectional energy conversion between energy storage systems and the smart grid. However, the dead time introduced to prevent phase-leg shoot-through inevitably reduces the effective width of the SPWM pulses, thereby degrading conversion efficiency and increasing total harmonic distortion (THD). To mitigate these issues and enhance overall performance, this paper proposes an adaptive dead time compensation and soft-switching coordinated control strategy tailored for single-phase HFLMCs: First, the dead time is dynamically adjusted based on the instantaneous load current to minimize body-diode conduction losses while guaranteeing reliable commutation; Second, the phase-shift angle is dynamically regulated to precisely compensate for the dead-time-induced fundamental voltage loss, thereby improving the sinusoidal characteristics of the output waveforms; Third, by integrating the primary-side phase-shift control with a secondary-side “early-turn-off/delayed-turn-on” switching sequence, zero-voltage switching (ZVS) turn-on is successfully achieved across a broad load spectrum. Experimental evaluations on a 1-kW prototype demonstrate that the proposed strategy achieves a peak efficiency of 95.35% and reduces the output current THD to 1.90% under the rated power, representing an improvement of over 1% compared to the conventional fixed dead-time strategy.