A family of single-phase high-reliability grid-connected inverter topology is proposed to solve the shoot-through problem in conventional bridge-type grid-connected inverters. The proposed grid-connected inverters are deduced from the high-reliability cells. The operating principles of the proposed high-reliability grid-connected inverters with bipolar and unipolar modulations are illustrated. The constituent principle of the high-reliability grid-connected inverters is concluded. The simulation results of a dual-buck full-bridge grid-connected inverter with unipolar modulation verify the theoretical analysis. The comparison between the high-reliability grid-connected inverter and traditional grid-connected inverter shows that the dual-buck half-bridge grid-connected inverter is suitable for 110~120 V grid-voltage applications and the full-bridge type high-reliability grid-connected inverters are promising in 220~240 V grid-voltage applications.