Abstract:
Light weight, small size, high efficiency as non-isolated PV grid-connected inverter advantages. Still, there is an electrical connection between the PV cells and the grid in non-isolated PV grid-connected inverters, which quickly generates large leakage currents to the ground. The standard mode leakage current will cause grid-connected current distortion and additional losses and threaten personal safety. In addition, the traditional bridge inverter has the problem of bridge arm straight-through, which renders the system less stable. A dual grounded leakage current-free PV inverter is proposed to address the above problems. The inverter topology consists of a Buck-Boost circuit and a DBHB circuit, with PWM control for the Buck-Boost circuit and hysteresis loop current control for the DBHB circuit. This inverter has no common-mode leakage current and does not lead to bridge arm straight-through. The analysis of the simulation proves the feasibility and effectiveness of the topology.VCVVCVCCVC
