HYDROGEN SYSTEM AND HYDROGEN SYSTEM OPERATING METHOD

A hydrogen system includes: a compressor that causes, by application of a voltage between an anode and a cathode, hydrogen in a hydrogen-containing gas supplied to the anode to move to the cathode through an electrolyte membrane and compresses the hydrogen; a first flow channel that supplies the hydrogen-containing gas to the anode; a second flow channel that branches off from the first flow channel and supplies the hydrogen-containing gas to the cathode; and a check valve that is provided in the second flow channel and prevents a flow in a direction opposite to a flow of the hydrogen-containing gas to be supplied to the cathode.