The utility model discloses a single -stage formula Z source photovoltaic grid -connected inverter's unified controller, including photovoltaic voltage sample module and the photovoltaic current sample module that links to each other with the solar photovoltaic array respectively, the electric capacity voltage sample module that links to each other with the Z source network, the electric wire netting voltage sample module that links to each other with three -phase grid ) and electric wire netting current sample module, photovoltaic system utilizes the direct time of Z source network and dc -to -ac converter to step up because the single -stage formula of Z source dc -to -ac converter is incorporated into the power networks, and the electric current contravariant control that can realize being incorporated into the power networks simultaneously has harmonic and reactive compensation concurrently, and overall structure is compact, and efficiency is higher, and it is more reliable to work.