Wave power generation system and method for controlling same

A wave power generation system comprising:

• a movable object that moves by waves while floating on the waves;
• a motion transmission unit comprising a plurality of tension transmission members that connected to at least three portions of the movable object to enable a six degrees-of-freedom motion of the movable object and that are configured to transmit kinetic energy of the movable object in one direction;
• a converting body connected to the plurality of tension transmission members;
• an equalizer disposed on one side of the converting body;
• a power conversion unit disposed on another side of the converting body and configured to generate a fluid pressure;
• and
• a power generation unit connected to the power conversion unit and configured to generate power,
• wherein the power conversion unit comprises:
• a fluid pressure generation unit connected to the tension transmission members and configured to generate a fluid pressure;
• a hydraulic driving unit connected to the power generation unit to generate power;
• a first hydraulic circuit configured to allow a fluid to flow toward the fluid pressure generation unit;
• a second hydraulic circuit configured to allow a fluid to flow toward the hydraulic driving unit, the second hydraulic circuit comprising a high-pressure accumulator and a low-pressure accumulator provided in front of and behind the hydraulic driving unit;
• and
• a rectifier circuit disposed between the first hydraulic circuit and the second hydraulic circuit and configured to change a direction of the fluid,
• wherein when the tension transmission members are pulled, energy is stored in the equalizer, and the power conversion unit allows a fluid to flow in a first direction so that power is generated in the power generation unit, and
• wherein when the tension transmission members are not pulled, the power conversion unit allows a fluid to flow in a second direction by the energy stored in the equalizer so that power is generated in the power generation unit.

A method of controlling a wave power generation system, the method comprising:

• allowing, by a power conversion unit, a fluid to flow in a first direction along a first hydraulic circuit when a tension is applied through a tension transmission member by a six degrees-of-freedom motion of a movable object floating on waves;
• storing energy in an equalizer;
• allowing, by a rectifier circuit of the power conversion unit, the fluid flowing in the first direction to flow toward a hydraulic driving unit along a second hydraulic circuit;
• generating, by a power generation unit connected to the hydraulic driving unit, power when a fluid flows from a high-pressure accumulator of the second hydraulic circuit to a lower-pressure accumulator of the second hydraulic circuit;
• allowing, by the power conversion unit, a fluid to flow in a second direction along the first hydraulic circuit using the energy stored in the equalizer when the tension is not applied by the tension transmission member, the second direction being opposite to the first direction;
• changing, by the rectifier circuit, a direction of the fluid flowing in the second direction and allowing the fluid to flow toward the hydraulic driving unit in a same direction as the first direction along the second hydraulic circuit;
• and
• generating, by the power generation unit, power when a fluid flows from the high-pressure accumulator to a lower-pressure accumulator.