A　novel　soft-switching　three-phase　grid-connected　quasi-Z-source　inverter　is　proposed　in　this　paper.　A　branch　including　one　resonant　inductor,　one　resonant　capacitor　and　two　active　switches,　is　added　to　the　impedance　network　on　the　basis　of　the　quasi-Z-source　inverter　topology.　In　addition,　an　improved　space　vector　modulation　(SVM)　for　the　inverter　is　proposed.　Thus,　soft-switching　operations　of　all　switches　could　be　realized　in　shoot-through　states.　The　relevant　switching　losses　and　the　THD　of　output　waveform　are　reduced.　The　soft-switching　characteristics　are　illustrated　by　the　simulation　results,　which　verify　the　theoretical　analysis.　©　2019　IEEE.