Non-isolation photovoltaic grid-connection inverter attracts extensive attention thanks to such advantage as low cost and small volume. However

the leakage current issue due to parasitic capacitance and inductance can be occurred between the photovoltaic cell panel and ground

which affects the life of inverter and even

in case of serious condition

endangers personnel safety. In this paper

it is analyzed through modeling that the leakage current of the photovoltaic current gird-connection inverter is related to common mode voltage which in turns has a definite relation with the vector of inverter

thus finding that the leakage current is mainly due to zero vector. Therefore

in this paper

a kind of method of multicarrier modulation abandon zero vectors are proposed to achieve leakage current suppression of photovoltaic grid-connection inverter. This method can achieve the suppression of the leakage current without increase of hardware and cost. In the photovoltaic grid-connection inverter

appropriate design of current controller is of great importance to system stability and power quality. In this paper

PR（proportional resonant

PR in short） controller is sued to achieve fast and accurate control

thus omitting complicated coordination variation. The correctness of the proposed algorithm is verified through simulation.