The photovoltaic grid-connected power generation is a key development direction for thedevelopment and utilization of renewable energy and its core components are grid-connected inverter.Thetraditional non-isolation H5 inverter can not suppress and control the common mode current.In this paper

a new type of H5 bridge inverter topology is developed wich

compared to the traditional one

has only oneswitch tube added so to keep isolation between PV module and and power grid during the current flowingperiod and achieve suppression of the common mode leakge current.Double L filter of H5 bridge topology isdesigned and the double loop control strategy based on quasi proportiona reasonant control is proposed.Theexperimental platform of H5 bridge inverter is set up and it is demonstrated that the H5 bridge topologicalstructure can suppress effectively common mode current

the control strategy has good dynamic and staticperofrmance and the grid-connected current has small harmonic.