The ship's power generation system is started. The power generation system of a ship according to an embodiment of the present invention includes organic Rankine cycles consisting of cycles in the order of an evaporator, an expansion turbine, a carburetor, a heat medium tank and a pump on a heat medium circulation line through which a heat medium for vaporizing liquefied gas is circulated; A generator for providing starting power required when one of the organic Rankine cycles is operated; And it may include a switchboard for controlling the amount of power generation of the generator according to the power generation according to the operation of the organic Rankine cycle.
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