Regeneration energy type electric generation apparatus and its rotor fixing method

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;
• and
• after 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, and
• wherein 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.

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;
• and
• locking 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, and
• wherein, 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.

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;
• and
• a 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, and
• an 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.

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;
• and
• a 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.

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, and
• wherein 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.