The utility model relates to an alternating current -direct current integration electrical power generating system of transformer substation, include: parallelly connected DC power supply converter, direct -current input generating line, NULL generating line, current -sharing control unit, direct current output generating line, direct current control generating line, alternating current power supply, photovoltaic module, battery, wherein to the photovoltaic current input mouth that allies oneself with the DC power supply converter links to each other with the direct -current input generating line, and the direct -current input generating line links to each other with photovoltaic module, parallelly connected DC power supply converter AC input links to each other with the NULL generating line, the NULL generating line links to each other with alternating current power supply, the current equalizer of parallelly connected DC power supply converter links to each other with the current -sharing control unit, and the current -sharing control unit links to each other with direct -current input generating line, direct current output generating line simultaneously, and the direct current output generating line links to each other with direct current control generating line, the current output terminal of parallelly connected DC power supply converter links to each other with the direct current output generating line, the electric input end that fills of parallelly connected DC power supply converter links to each other with the battery.