초록 ▼

Described is a power generating apparatus and a rotor locking method for the apparatus, which is capable of locking the rotor without using a huge braking mechanism. The power generating apparatus of renewable energy type includes a blade, a rotor including a hub and a main shaft, a hydraulic pump o

Described is a power generating apparatus and a rotor locking method for the apparatus, which is capable of locking the rotor without using a huge braking mechanism. The power generating apparatus of renewable energy type includes a blade, a rotor including a hub and a main shaft, a hydraulic pump of variable displacement type driven by rotation of the rotor, a hydraulic motor driven by operating oil pressurized by the hydraulic pump, and a generator coupled to the hydraulic motor. The rotor locking method for the power generating apparatus may include the steps of: decelerating the rotor by adjusting a pitch angle of the blade: after the decelerating step, stopping the rotor by applying a braking force by the hydraulic pump to the rotor; and locking the rotor so that the rotor is immovable in a rotation direction.

대표청구항 ▼

1. A rotor locking method for a power generating apparatus of renewable energy type comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub; a hydraulic pump of variable displacement type driven by rotation of the rotor; a hydraulic motor driven

1. A rotor locking method for a power generating apparatus of renewable energy type comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub; a hydraulic pump of variable displacement type driven by rotation of the rotor; a hydraulic motor driven by operating oil whose pressure is increased by the hydraulic pump; and a generator coupled to the hydraulic motor, the method comprising the steps of: decelerating the rotor by adjusting a pitch angle of the blade:after the decelerating step, stopping the rotor by applying a braking force by the hydraulic pump to the rotor; andlocking the rotor so that the rotor is immovable in a rotation direction,wherein the power generating apparatus of renewable energy type further comprises:an encoder for detecting an angular position of the rotor; anda high pressure oil line for supplying the operating oil from the hydraulic pump to the hydraulic motor, andwherein, in the locking step, the rotor is stopped at a target angular position by adjusting at least one of a displacement of the hydraulic pump and a pressure of the operating oil in the high pressure oil line based on a detection result detected by the encoder. 2. The rotor locking method for the power generating apparatus of renewable energy type according to claim 1, wherein, in the locking step, a locking pin is inserted in a first hole formed on a rotor side and a second hole formed on side of a nacelle housing the main shaft, andwherein the target angular position is such an angular position that the first hole formed on the rotor side matches with the second hole formed on the nacelle side. 3. A rotor locking method for a power generating apparatus of renewable energy type comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub; a hydraulic pump of variable displacement type driven by rotation of the rotor; a hydraulic motor driven by operating oil whose pressure is increased by the hydraulic pump; and a generator coupled to the hydraulic motor, the method comprising the steps of: decelerating the rotor by adjusting a pitch angle of the blade:after the decelerating step, stopping the rotor by applying a braking force by the hydraulic pump to the rotor; andafter the stopping step, locking the rotor so that the rotor is immovable in a rotation direction,wherein, in the locking step, a locking pin is inserted in a first hole formed on a rotor side and a second hole formed on a side of a nacelle housing the main shaft, andwherein the method further comprises the step of after the stopping step and before the locking step, matching the first hole formed on the rotor side with the second hole formed on the nacelle side by driving the hydraulic pump in a motoring mode by pressurized oil supplied to the hydraulic pump and rotating the rotor. 4. The rotor locking method for the power generating apparatus of renewable energy type according to claim 3, wherein the power generating apparatus of renewable energy further comprises an encoder which detects an angular position of the rotor, andwherein, in the matching step, opening and closing of a valve provided in a supply path of supplying the pressurized oil to the hydraulic pump, is controlled based on a detection result of the encoder so as to match the first hole with the second hole. 5. The rotor locking method for the power generating apparatus of renewable energy type according to claim 1, wherein the power generating apparatus of renewable energy type further comprises a low pressure oil line which returns the operating oil from the hydraulic motor to the hydraulic pump,wherein the hydraulic pump comprises: a cylinder; a piston sliding in the cylinder in response to the rotation of the rotor; a working chamber formed by the cylinder and the piston; a high pressure valve opening and closing a conduit between the working chamber and the high pressure oil line; and a low pressure valve opening and closing a conduit between the working chamber and the low pressure oil line, andwherein the method further comprises the step ofafter the stopping step and before the locking step, temporarily locking the rotor in such a state that the high pressure valve and the low pressure valve are maintained closed. 6. The rotor locking method for the power generating apparatus of renewable energy type according to claim 1, wherein the power generating apparatus of renewable energy type further comprises a high pressure oil line which supplies the operating oil from the hydraulic pump to the hydraulic motor,wherein, to the high pressure oil line, an accumulator is connected via an accumulator valve, andwherein, in the stopping step, at least a displacement of the hydraulic motor is increased and excess of the operating oil in the high pressure oil line is accumulated in the accumulator by opening the accumulator valve. 7. The rotor locking method for the power generating apparatus of renewable energy type according to claim 1, wherein the hydraulic motor is a variable displacement type, andwherein, in the stopping step, at least a displacement of the hydraulic pump is increased and excess of the operating oil in the high pressure oil line is absorbed in the hydraulic motor by temporarily increasing a displacement of the hydraulic motor. 8. A rotor locking method for a power generating apparatus of renewable energy type comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub; a hydraulic pump of variable displacement type driven by rotation of the rotor; a hydraulic motor driven by operating oil whose pressure is increased by the hydraulic pump; and a generator coupled to the hydraulic motor, the method comprising the steps of: decelerating the rotor by adjusting a pitch angle of the blade;after the decelerating step, stopping the rotor by applying a braking force by the hydraulic pump to the rotor; andlocking the rotor so that the rotor is immovable in a rotation direction;wherein the power generating apparatus of renewable energy type further comprises: a high pressure oil line which supplies the operating oil from the hydraulic pump to the hydraulic motor; a low pressure oil line which returns the operating oil from the hydraulic motor to the hydraulic pump; a bypass flow path which connects the high pressure oil line to the low pressure oil line and bypasses the hydraulic motor; and a relief valve which is provided in the bypass flow path, andwherein, in the stopping step, at least a displacement of the hydraulic pump is increased and excess of the operating oil in the high pressure oil line is released to the low pressure oil line via the bypass flow path and the relief valve. 9. The rotor locking method for the power generating apparatus of renewable energy type according to claim 1, wherein the power generating apparatus of renewable energy type is a wind turbine generator which rotates the rotor by wind in a form of renewable energy, input a torque of the rotor to the generator via the hydraulic pump and the hydraulic motor, and generates electric power in the generator. 10. A power generating apparatus of renewable energy type, comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub;a hydraulic pump of variable displacement type which is driven by rotation of the rotor;a hydraulic motor which is driven by operating oil whose pressure is increased by the hydraulic pump;a generator which is coupled to the hydraulic motor;a pitch drive mechanism which adjusts a pitch angle of the blade to decelerate the rotor;a pump control unit which controls the hydraulic pump to stop the rotor by applying a braking force by the hydraulic pump to the rotor having been decelerated by the pitch drive mechanism; anda locking unit which locks the rotor so that the rotor is immovable in a rotation direction,a high pressure oil line for supplying the operating oil from the hydraulic pump to the hydraulic motor, andan encoder for detecting an angular position of the rotor;wherein the pump control unit is configured to stop the rotor at a target angular position by adjusting at least one of a displacement of the hydraulic pump and a pressure of the operating oil in the high pressure oil line based on a detection result detected by the encoder. 11. The power generating apparatus of renewable energy type according to claim 10wherein the locking unit is a locking pin which is inserted in a first hole formed on a rotor side and a second hole formed on a nacelle side, andwherein the target angular position is such an angular position that the first hole formed on the rotor side matches with the second hole formed on the nacelle side. 12. A power generating apparatus of renewable energy type, comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub;a hydraulic pump of variable displacement type which is driven by rotation of the rotor;a hydraulic motor which is driven by operating oil whose pressure is increased by the hydraulic pump;a generator which is coupled to the hydraulic motor;a pitch drive mechanism which adjusts a pitch angle of the blade to decelerate the rotor;a pump control unit which controls the hydraulic pump to stop the rotor by applying a braking force by the hydraulic pump to the rotor having been decelerated by the pitch drive mechanism;a locking unit which includes a locking pin which is inserted in a first hole formed on a rotor side and a second hole formed on a nacelle side and locks the rotor so that the rotor is immovable in a rotation direction;an encoder which detects an angular position of the rotor;a pressurized oil source from which pressurized oil is supplied to the hydraulic pump;a valve which is provided in a supply path of the pressurized oil from the pressurized oil source to the hydraulic pump; anda valve control unit which controls opening and closing of the valve based on a detection result of the encoder to drive the hydraulic pump in a motoring mode by the pressurized oil from the pressurized oil source and to rotate the rotor so that the first hole formed on the rotor side matches with the second hole formed on the nacelle side. 13. The power generating apparatus of renewable energy type according to claim 12, further comprising: a high pressure oil line which supplies the operating oil from the hydraulic pump to the hydraulic motor; anda low pressure oil line which returns the operating oil from the hydraulic motor to the hydraulic pump,wherein the hydraulic pump comprises: a cylinder; a piston sliding in the cylinder in response to the rotation of the rotor; a working chamber formed by the cylinder and the piston; a high pressure valve opening and closing a conduit between the working chamber and the high pressure oil line; a low pressure valve opening and closing a conduit between the working chamber and the low pressure oil line; and a casing housing the cylinder, the piston, the working chamber, the high pressure valve and the low pressure valve,wherein the supply path of the pressurized oil extends from the pressurized oil source and penetrates the casing to be in communication with the working chamber, andwherein the valve is an electromagnetic valve arranged in the supply path of the pressurized oil. 14. The power generating apparatus of renewable energy type according to claim 13, wherein the hydraulic pump further comprises a ring cam having a wave-shaped profile of a concave-convex shape which determines a cycle of a reciprocating motion of the piston,wherein a plurality of groups of at least two of the pistons are provided, said at least two of the pistons having the same phase in the cycle of the reciprocating motion, andwherein the valve is shared by the at least two of the pistons belonging to each of the groups. 15. A power generating apparatus of renewable energy type, comprising: a rotor including a blade, a hub on which the blade is mounted and a main shaft coupled to the hub;a hydraulic pump of variable displacement type which is driven by rotation of the rotor;a hydraulic motor which is driven by operating oil whose pressure is increased by the hydraulic pump;a generator which is coupled to the hydraulic motor;a pitch drive mechanism which adjusts a pitch angle of the blade to decelerate the rotor;a pump control unit which controls the hydraulic pump to stop the rotor by applying a braking force by the hydraulic pump to the rotor having been decelerated by the pitch drive mechanism;a locking unit which locks the rotor so that the rotor is immovable in a rotation direction,wherein the locking unit is a locking pin which is inserted in a first hole formed on the rotor side and a second hole formed on a side of the nacelle which houses the main shaft,wherein the hydraulic pump comprises: a plurality of cylinders; a plurality of pistons each sliding in the cylinder; and a ring cam which is arranged on an outer circumference of the main shaft and has a wave-shaped profile of a concave-convex shape which determines a cycle of a reciprocating motion of the piston, andwherein the wave-shaped profile of the ring cam is determined so that the first hole matches with the second hole when at least one of the pistons is positioned at a valley of the concave-convex shape of the ring cam. 16. The power generating apparatus of renewable energy type according to claim 10, wherein the locking unit is a locking pin which is inserted in a first hole formed on the rotor side and a second hole formed on a side of the nacelle which houses the main shaft,wherein the power generating apparatus of renewable energy type further comprises: an encoder which detects an angular position of the rotor;an actuator attached to the locking pin;a determination unit which determines whether or not the first hole matches with the second hole based on a detection result of the encoder; andan actuator control unit which, when it is determined that the first hole matches with the second hole, causes the actuator to push the locking pin in the first hole and the second hole. 17. The power generating apparatus of renewable energy type according to claim 10, wherein the locking unit is a locking pin which is inserted in a first hole formed on the rotor side and a second hole formed on a nacelle side, andwherein a tip surface of the locking pin is chamfered as well as an opening end surface of at least one of the first and second holes which is on a side opposing an insertion direction of the locking pin. 18. The rotor locking method for the power generating apparatus of renewable energy type according to claim 3, wherein the rotation of the rotor in the action of driving the hydraulic pump in the motoring mode is accomplished via the driving of the hydraulic pump in the motoring mode. 19. The power generating apparatus of renewable energy type according to claim 12, wherein the power generating apparatus is configured to rotate the rotor the driving of the hydraulic pump in the motoring mode.