JP2017190701A - Wind power generation system or control method of wind power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain reliability of a power cable between a nacelle and a tower.SOLUTION: A horizontal axis wind power generation system comprises a rotor 1 that rotates by receiving wind, a nacelle 2 that rotatably supports the rotor, a tower 3 that rotatably supports the nacelle, and a yaw driving device 5 that rotates the nacelle with respect to the tower, and also comprises an upper cable 61 that rotates with the nacelle, a lower cable 62, and a connection part 7 that connects and disconnects the upper cable and the lower cable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wind power generation system or a method for controlling a wind power generation system.

  Wind power generation systems that use natural energy to prevent global warming are attracting attention. As a technique of a wind power generation system that can reduce a load caused by a typhoon or a gust when power is lost, for example, there is a method described in Patent Document 1. In Patent Document 1, the yaw angle is controlled so that the rotor on the upwind side waits on the downwind side, and the rotor of the downwind wind turbine is passively positioned on the leeward side by the wind force, and is stable. The operation method for reducing the deviation angle from the wind direction is described.

WO2003 / 58062

  Initially, wind power generation systems were installed mainly on land, but in recent years the number of offshore wind power plants has increased. There are two types of offshore wind power generation, a landing type and a floating type, but the generated power of the wind power generation system is basically connected to the land power system through a transmission cable installed on the seabed.

  This submarine power transmission cable is known to have a risk of disconnection. If the submarine cable is cut, the power supply from the power system is interrupted for a long period of time. Therefore, it is necessary to reduce the load against a gust of wind caused by a typhoon or the like approaching when the power supply is stopped. The above relates to the case where a wind power plant is installed on the ocean, but even when installed on land, it is possible that the power supply from the power system will be interrupted for a long time including disasters.

  The technique described in Patent Document 1 is effective as a load reduction method, but the yaw rotation is passive, so the rotation angle cannot be controlled, and if yaw rotation continues in the same direction, the power that connects the nacelle and the tower The possibility of excessive twisting and damaging the cable is not excluded.

  Therefore, an object of the present invention is to provide a wind power generation system or a wind power generation system control method capable of maintaining the reliability of the power cable between the nacelle and the tower.

  In order to solve the above problems, a wind power generation system according to the present invention includes a rotor that rotates by receiving wind, a nacelle that rotatably supports the rotor, a tower that rotatably supports the nacelle, and the nacelle. A horizontal-axis wind power generation system including a yaw drive device that rotates with respect to the tower, the upper cable rotating with the nacelle, the lower cable, the upper cable, and the lower cable are connected and disconnected. A connecting portion is provided.

  The method for controlling a wind power generation system according to the present invention includes a rotor that rotates by receiving wind, a nacelle that rotatably supports the rotor, a tower that rotatably supports the nacelle, and the nacelle that is the tower. Control method of a horizontal axis wind power generation system comprising a yaw drive device that rotates relative to the nacelle, an upper cable that rotates with the nacelle, and a lower cable connected to the upper cable, wherein the lower cable is The connection between the upper cable and the lower cable is released when the connected system side voltage drops for a predetermined period or longer.

  According to the present invention, it is possible to maintain the reliability of the power cable between the nacelle and the tower.

It is a figure which shows schematic structure of the wind power generator which concerns on one Embodiment of this invention. It is a conceptual diagram which shows the structure of the cable disconnection means. It is a figure explaining the state by which the connection connectors 76A and 76B were cut away. It is a figure explaining the state in which the nacelle side cable bracket 71 and the tower side cable bracket 73 are separated mechanically and can be freely rotated with respect to each other.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. In addition, the following is an Example to the last and it is not the meaning which intends that the embodiment of this invention is limited to the following specific aspect.

  A first embodiment will be described with reference to FIGS. As shown in FIG. 1, the wind turbine generator according to the present embodiment has a rotor 1 composed of blades that rotate by receiving wind and a hub that supports the blades, and a tower 3 described below while rotatably supporting the rotor 1. And a nacelle 2 that supports the yaw so that it can rotate, and a tower 3 that supports the nacelle 2 so that it can rotate. The nacelle 2 includes a generator 4 that generates electric power by the rotational movement of the rotor, and a yaw driving device 5 for changing the azimuth angle of the nacelle 2. The yaw driving device 5 can also be provided in the tower 3. In addition, in order to electrically connect the electrical equipment in the nacelle 2 (for example, the generator 4 etc.) and the tower lower side equipment (for example, the power converter 8 or the step-up transformer 11 etc.), the equipment on the nacelle 2 side has The upper cable 61 is connected to the tower side equipment, and the lower cable 62 is connected to the tower side equipment. The lower end of the upper cable 61 is connected to the upper end of the lower cable 62 using the connecting means 7 inside the tower. Here, for example, a cable 61 is connected to the output terminal of the generator 4 as a main circuit cable, and further connected to the power conversion device 8 on the lower side of the tower via the cable 62. Further, an upper cable 61 different from the above is connected to the power supply terminal of the yaw drive device 5 as an auxiliary machine power cable, and an auxiliary cable on the lower side of the tower is connected by a lower cable 62 different from the above connected to the upper cable 61. Connected to the machine distribution board 9. As described above, in this embodiment, two sets of the upper cable 61 and the lower cable 62 that are different for transporting the generated power and for transporting the auxiliary power supply are provided. Of course, the number of the upper cables 61 and the lower cables 62 is not limited. The power converter 8 is connected to the power system via the step-up transformer 11. A windmill control panel 10 serving as a main control device of the wind turbine generator is connected to the auxiliary power distribution panel 9. Electrical connection is made from the wind turbine control panel 10 to the connection means 7. Further, the wind turbine control panel 10 outputs a connection or release command to the connection means 7. In the present embodiment, the wind turbine control panel 10 serving as the main control device of the wind turbine generator functions as a control device for the connection means 7, but the connection means 7 can also be controlled by another control device.

  In FIG. 1, the azimuth angle (yaw angle) of the nacelle 2 is rotated by the yaw driving device 5. The cable 61, the connecting means 7, and the cable 62 are fixed to the tower 3 so that twisting may occur due to a change in yaw angle.

  Here, when the system power supply is reduced (for example, more than 10% lower than the normal voltage) for a long period (for example, several days), it is difficult to maintain the rotation by the yaw driving device 5. Also in this case, in order to reduce the load received from the wind, the rotor 1 and the nacelle 2 passively react to the wind force so that the rotor 1 is positioned leeward (downwind position) with respect to the nacelle 2. It is effective to shift to the rotating mode. In this mode, since the yaw rotation is passive, the rotation angle cannot be controlled, and the yaw rotation may continue in the same direction. In that case, it is conceivable that excessive twisting occurs in the upper cable 61 and the lower cable 62 that connect the nacelle 2 and the tower 3.

  Therefore, in this embodiment, when the system power supply is stopped for a long period of time, the connection means 7 can disconnect the connection between the upper cable 61 and the lower cable 62. By disconnecting the upper cable 61 and the lower cable 62 by the connecting means 7, it is possible to enter a standby operation mode in which twisting does not occur even if the yaw rotation is performed. If the connection between the upper cable 61 and the lower cable 62 is released, even if the connection is released and the rotor 1 is switched to the leeward position with respect to the nacelle 2, the connection is released. The rotor 1 may be switched before the nacelle 2 to be positioned leeward so that the state is maintained.

  This disconnection operation may be performed by an operator disconnecting the connection at the connection means 7 or remotely by an electrical connection signal from a control device such as the windmill control panel 10. In some cases, the worker may disconnect directly within the wind power generation system, or an alarm means (not shown) for notifying the remote location etc. of the abnormality is provided so that the worker receives the alarm and the remote location etc. It is also possible to issue a disconnect command.

  As for the timing of disconnection and alarm notification, for example, when the system side voltage drops for a predetermined period or more, or the remaining amount of a battery (not shown) for moving the yaw actuator when the system side voltage drops falls below a predetermined remaining amount Cases. This battery can be used not only for a long-term voltage drop but also for a few seconds. In addition, the system side voltage, not the system voltage here, is a cable that connects the system side and the wind power generation system (for example, a submarine cable), although the system voltage is normal as well as the system voltage itself is lowered. This is because there are cases where the power transmission system is abnormal due to damage.

  FIG. 2 is a conceptual diagram illustrating details of the connecting means 7. The connection means 7 connects the upper cable bracket 71 that fixes the plurality of upper cables 61, the lower cable bracket 73 that fixes the plurality of lower cables 62, and the upper cable bracket 71 and the lower cable bracket 73, A rotation preventing means 72 that bears a torque load due to a twist between the upper cable bracket 71 and the lower cable bracket 73, a motor 74 and a rotary shaft 75 that bear a tensile load between the cable bracket 71 and the cable bracket 73, and a cable 61 The connectors 62A and 76B are configured to electrically connect and disconnect the cable 62.

  The rotation preventing means 72 will be described. The rotation preventing means 72 is fixed to the cable bracket 71. The lower side of the rotation preventing means 72 is inserted into a hole (or a recess) formed in the cable bracket 73 so that the cable bracket 71 and the cable bracket 73 are not twisted separately even when torque is applied by twisting. Like that.

  The motor 74 and the rotating shaft 75 will be described. In the present embodiment, the motor 74 and the rotating shaft 75 are connected so that both brackets can be separated, and constitute a bracket connecting means. The motor 74 is an actuator that generates a driving force. The rotating shaft 75 has a thread groove and has a corresponding screw hole on the cable bracket 73 side. As a result, the rotational motion of the motor 74 can be converted into a linear motion like a known ball screw mechanism, and the position of the cable bracket 73 relative to the cable bracket 71 can be made variable.

  3 and 4 are drawings when the rotating shaft 75 is rotated by the motor 74 and the position of the cable bracket 73 is moved downward in the drawing. FIG. 3 shows a state in which the cable bracket 73 is moved downward, so that a tensile load is applied between the cable 61 and the cable 62 and the connectors 76A and 76B are separated. The connector is a connector that is released by a pulling force. Thereby, the cable 61 and the cable 62 are electrically cut. FIG. 4 shows a state where the cable bracket 73 is further moved downward as compared with FIG. In this state, the rotation preventing means 72 is completely pulled out from the hole of the cable bracket 73. Moreover, since the cable bracket 73 comes to a position where the diameter on the lower side of the rotation shaft 75 is thin, the cable bracket 73 can freely rotate regardless of the cable bracket 71 side. Thereby, even if it carries out yaw rotation, a twist is not produced.

  The motor 74 described in the present embodiment may be driven automatically by a control device such as the windmill control panel 10 or may be driven by an operator receiving an alarm notification at the site or at a remote location.

  In the present embodiment, the above connection means has been described as an embodiment, but it goes without saying that the present invention is not limited to this, and various different means can be used without departing from the spirit of the invention. Is possible.

1: rotor, 2: nacelle, 3: tower, 4: generator, 5: yaw drive, 61: cable (nacelle side), 62: cable (tower side), 7: cable disconnecting means, 8: power converter , 9: Auxiliary power distribution board, 10: Control device, 71: Cable bracket (nacelle side), 72: Anti-rotation means, 73: Cable bracket (tower side), 74: Motor, 75: Motor rotation shaft, 76A 76B: Connector

Claims (12)

A rotor that rotates in response to the wind;
A nacelle for rotatably supporting the rotor;
A tower that rotatably supports the nacelle;
A horizontal axis wind power generation system comprising a yaw drive for rotating the nacelle relative to the tower,
A wind power generation system comprising: an upper cable that rotates together with the nacelle; a lower cable; and a connection portion that connects and releases the upper cable and the lower cable. The wind power generation system according to claim 1,
A wind power generation system comprising: a control device that outputs a command to release the connection when the system-side voltage to which the lower cable is connected has dropped for a predetermined period or longer. The wind power generation system according to claim 1,
A wind power generation system comprising alarm means for notifying an abnormality when a system side voltage to which the lower cable is connected drops for a predetermined period or more The wind power generation system according to claim 1,
A battery for driving the yaw driving device when the system side voltage to which the lower cable is connected is lowered,
A wind power generation system comprising: a control device that outputs a command to release the connection unit when the remaining amount of the battery drops below a predetermined remaining amount The wind power generation system according to claim 1,
A battery for driving the yaw driving device when the system side voltage to which the lower cable is connected is lowered,
A wind power generation system comprising alarm means for notifying an abnormality when the remaining amount of the battery falls below a predetermined remaining amount The wind power generation system according to any one of claims 1 to 5,
A plurality of the upper cables and the lower cables are provided,
The connecting portion includes a bracket for fixing each cable such that a distance between the plurality of upper cables and the lower cables is substantially constant;
A wind power generation system comprising a connector for connecting and releasing the plurality of upper cables and the plurality of lower cables. The wind power generation system according to claim 6,
The bracket includes a first bracket that supports the plurality of upper cables;
A second bracket for supporting the plurality of lower cables;
A wind power generation system comprising bracket connection means for detachably connecting the first bracket and the second bracket. The wind power generation system according to claim 7,
The bracket connecting means includes an actuator that generates a thrust force that moves the first bracket and the second bracket closer to or away from each other.
The wind power generation system characterized in that the connector is a connector released by a pulling force. The wind power generation system according to any one of claims 1 to 8,
After the release of the connection portion, the nacelle rotates with respect to the tower using wind force so that the rotor is positioned leeward with respect to the nacelle. A rotor that rotates in response to the wind;
A nacelle for rotatably supporting the rotor;
A tower that rotatably supports the nacelle;
A yaw drive for rotating the nacelle relative to the tower;
A control method of a horizontal axis wind power generation system including an upper cable rotating with the nacelle and a lower cable connected to the upper cable,
A method for controlling a wind power generation system, wherein the connection between the upper cable and the lower cable is released when a system side voltage to which the lower cable is connected has dropped for a predetermined period or longer. It is a control method of the wind power generation system according to claim 10,
The wind power generation system includes a battery that drives the yaw driving device when the system-side voltage decreases.
A control method for a wind power generation system, wherein the connection between the upper cable and the lower cable is released when the remaining amount of the battery falls below a predetermined remaining amount. A method for controlling a wind power generation system according to claim 10 or 11,
After the connection between the upper cable and the lower cable is released, the nacelle is rotated with respect to the tower by using wind force so that the rotor is located leeward with respect to the nacelle. Method for controlling wind power generation system

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