A wind power generation system comprising: a DC bus; a plurality of feeders to transmit, to the DC bus, DC powers each of which is obtained by converting an AC power generated by a wind power generator, the feeders being connected to the DC bus; and a current limiting unit to prevent a DC current from flowing from the DC bus into each of the feeders, the current limiting unit being installed on each of the feeders, wherein the current limiting unit includes a DC breaker to cut off a DC current flowing from the feeder to the DC bus when the DC current exceeds a specified value, the DC breaker being disposed at a position where the DC current flowing from the feeder to the DC bus becomes maximum, characterized in that the current limiting unit further includes: a diode to prevent a DC current from flowing from the DC bus into the feeder, the diode being disposed between the DC breaker and the DC bus; a switch to short-circuit opposite ends of the diode when the wind power generator and an electric power conversion device to convert an AC power generated by the wind power generator into a DC power are activated, wherein the switch is closed at an initial activation or at a re-activation after maintenance so as to achieve a supply of the DC power from the DC bus to the wind power generator and an electric power conversion device, and opened when a current zero point is formed on operation start of the wind power generator and the electric power conversion device after the supply of the DC power from the DC bus, the switch being connected in parallel with the diode. a DC bus; a plurality of feeders to transmit, to the DC bus, DC powers each of which is obtained by converting an AC power generated by a wind power generator, the feeders being connected to the DC bus; and a current limiting unit to prevent a DC current from flowing from the DC bus into each of the feeders, the current limiting unit being installed on each of the feeders, wherein the current limiting unit includes a DC breaker to cut off a DC current flowing from the feeder to the DC bus when the DC current exceeds a specified value, the DC breaker being disposed at a position where the DC current flowing from the feeder to the DC bus becomes maximum, characterized in that the current limiting unit further includes: a diode to prevent a DC current from flowing from the DC bus into the feeder, the diode being disposed between the DC breaker and the DC bus; a switch to short-circuit opposite ends of the diode when the wind power generator and an electric power conversion device to convert an AC power generated by the wind power generator into a DC power are activated, wherein the switch is closed at an initial activation or at a re-activation after maintenance so as to achieve a supply of the DC power from the DC bus to the wind power generator and an electric power conversion device, and opened when a current zero point is formed on operation start of the wind power generator and the electric power conversion device after the supply of the DC power from the DC bus, the switch being connected in parallel with the diode. a diode to prevent a DC current from flowing from the DC bus into the feeder, the diode being disposed between the DC breaker and the DC bus; a switch to short-circuit opposite ends of the diode when the wind power generator and an electric power conversion device to convert an AC power generated by the wind power generator into a DC power are activated, wherein the switch is closed at an initial activation or at a re-activation after maintenance so as to achieve a supply of the DC power from the DC bus to the wind power generator and an electric power conversion device, and opened when a current zero point is formed on operation start of the wind power generator and the electric power conversion device after the supply of the DC power from the DC bus, the switch being connected in parallel with the diode.