Analysis of Characteristics of Zero-sequence Circulating Supraharmonics in Grid-connected System with Parallel Inverters Using Dynamic Phasors
To study the characteristics of zero-sequence circulating supraharmonics(ZSCSs)and sideband components in a grid-connected system with parallel inverters which have common AC and DC links,the loops of zero-sequence cir-culating current(ZSCC)in the system are studied through the analysis of switching states of each inverter,and the equiv-alent circuit of ZSCC is established.Afterwards,the dynamic phasor method is used to construct an analysis model of ZSCSs,in which the carrier phase difference between inverters is considered.Based on this model,the characteristics of ZSCSs and sideband components in the grid-connected system with parallel inverters are analyzed.Finally,simula-tion results verify the correctness of theoretical analyses.
supraharmoniczero-sequence circulating current(ZSCC)dynamic phasorparallel convertersgrid-con-nected system
万方数据
维普
