Contents I. Introduction
With the increase in converter capacity in wind power and PV industries, it is common to provide parallel power modules to ensure higher power ratings, redundancy, reliability, and flexibility, along with several other advantages such as smaller switching stress, lower cost, and lower maintenance [1] –[3]. Research efforts focus on parallel inverters including power sharing and circulating current suppression. For power- or load-current sharing [4] , [5], parallel-operated inverters could have different hardware topologies, circuit parameters, modulation techniques, and controller parameters, because they are completely independent of each other. However, for circulating current suppression applications, the hardware, modulation, and controller of the parallel inverters should be identical, to reduce the circulating current as much as possible [6].
