Power conversion system

A power conversion system configured to unidirectionally or bidirectionally transfer electric power between a direct-current power supply and any one of an alternating-current grid, an alternating-current load, or a direct-current load, the power conversion system comprising:

• a capacitor connected to the direct-current power supply via an inrush current prevention circuit which is switchable at least between a high-impedance state where impedance is relatively high and a low-impedance state where the impedance is relatively low;
• and
• a converter circuit which is an isolated type converter circuit, the converter circuit including a transformer, the transformer having a primary winding wire and a secondary winding wire, the capacitor being connected to the primary winding wire;
• a control circuit configured to control the inrush current prevention circuit and the converter circuit,
• the control circuit being configured to cause the converter circuit to start operating and then switch the inrush current prevention circuit from the high-impedance state to the low-impedance state.