The parallel structure of multi full-bridge inverters has obvious advantages in capacity configuration flexibility and redundancy reliability as well as the availability of energy storage components with a common DC bus.However

in case of deviation in amplitude or phase of the output voltage

the problem of circulating current should be considered.Firstly

the relationship between circulating current and the inverting current as well as inverting voltage is obtained by way of analyzing the generating mechanism of circulating current and

on this basis

a unified circulating current suppression strategy based on instantaneous sharing of load current is proposed

which can adjust the order of voltage after introducing the deviation between current target value and actual value into closed-loop control and make sure the consistency of output voltage amplitude and phase of each inverting circuit.Finally

the feasibility and correctness of the proposed circulating current is verified by the simulation and experiment.