Parallel Operation Control Strategy of High-Frequency-Link Single-Phase Full Bridge Full Wave Inverter Based on Virtual Impedance

The high-frequency-link single-phase full bridge full wave inverter with bidirectional active clamp circuit can realize safe commutation, and the secondary side of the transformer has no voltage spike. However, the capacity of a single high-frequency inverter is limited, and it cannot run for a long time at high load, which is difficult to meet the requirements of high-power applications. In this paper, a droop control strategy based on virtual impedance is established to realize the parallel operation of two high-frequency-link single-phase full-bridge full-wave inverters, which effectively improves the system capacity, and optimizes the circuit topology by simplifying the clamp circuit, and realizes the elimination of voltage spikes. The employment of virtual impedance improves the performance of the parallel system, and effectively solves the problem that the reactive power of the parallel system of inverters with different capacities is excessive and difficult to balance. Finally, through matlab/simulink simulation, the effectiveness of the droop control based on virtual impedance in the parallel operation of high-frequency- link single-phase full-bridge full-wave inverter is verified.