JP2013209969A - Wind power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind power generation system which can cancel out a low frequency noise generated by rotations of a wind mill provided on a wind power generation member while suppressing a change of the existing wind power member and without increasing the size of equipment.SOLUTION: A linear motor provided with a permanent magnet which is set as the so-called Halbach array is used for a vibration member 30, thereby, a three-phase coil is intensively excited and is miniaturized as compared with the conventional vibrator and, further, a sheet member 28 is axially vibrated with a large thrust in a low frequency. Therein, such low frequency sound deadening to cancel the low frequency noise provided with an attendant wave generated by causing a wind mill 20 to rotate is generated. Thus, a change of the existing wind mill apparatus 12 is suppressed and, without increasing the size of a vibrating member 16 (device), the low frequency noise provided with the attendant wave generated by causing the wind mill 20 to rotate can be canceled.

Description

  The present invention relates to a wind power generation system.

  Patent Document 1 discloses a wind power generator (wind power generation member) that converts power generated by rotation of a windmill rotor into AC power by an AC generator and stores the AC power in a battery as DC power through a commutator. Have been described. And this wind power generator supplies the eddy current brake to the eddy current brake that can brake the wind turbine rotor and reduce the rotation speed, and when the output power of the AC generator exceeds the set value. Brake control means to be operated in this manner. As a result, a constant power generation amount can be obtained even under strong winds without causing inconveniences such as breakage of operating parts and generation of low-frequency noise, and suppressing an overload to the AC generator.

JP 2004-104975 A

  However, in the conventional configuration, it is necessary to greatly change the wind power generation member itself.

  The subject of this invention is canceling the low frequency noise which arose by rotation of the windmill provided in the wind power generation member, without suppressing the change of the existing wind power generation member and enlarging an apparatus.

  A wind power generation system according to claim 1 of the present invention includes a wind turbine that is rotated by wind power, and detects a low-frequency noise generated by the wind power generation member that generates electric power by rotating the wind turbine and the wind turbine rotating. And a plurality of first elements arranged in the first direction so that the direction of the magnetic pole changes in an integer equal to 2π in the first direction, the magnetic field on one side is strengthened and the magnetic field on the other side is weakened. A first permanent magnet array having permanent magnets, and a direction of the magnetic poles arranged to face the first permanent magnet array on the one side of the first permanent magnet array and in an integer equal to 2π in the first direction And the plurality of second arrays arranged in the first direction so that the magnetic fields on the side of the first permanent magnet array arranged opposite to each other are strengthened and the magnetic fields on the side opposite to the first permanent magnet array are weakened. A first member having a second permanent magnet array with two permanent magnets; A second member having a coil which is supported so as to be relatively movable in the first direction with respect to the first member and at least a part of which is arranged between the first permanent magnet row and the second permanent magnet row; A plate member that is fixed to an end of the second member in the first direction and whose plate surface faces the first direction, and controls the vibration member. A control member that vibrates the plate member based on the low-frequency noise detected by the detection member so as to generate a low-frequency sound that cancels out the low-frequency noise generated by the rotation of the windmill; It is characterized by providing.

  According to the said structure, in order to generate electric power, the windmill provided in the wind power generation member rotates with a wind force. Low-frequency noise is generated by the rotation of the windmill. And a detection member detects this low frequency noise.

  Further, the control member controls and operates the vibration member so that a low-frequency sound that cancels out the low-frequency noise generated by the rotation of the windmill is generated based on the low-frequency noise detected by the detection member. The plate member is vibrated.

  Here, the vibrating member has a first permanent magnet row in which the direction of the magnetic pole is changed by an integer equal to 2π in the first direction and the magnetic field on the second permanent magnet row side arranged on one side strengthens, There is provided a second permanent magnet array in which the direction of the magnetic poles changes by an integer equal to 2π in one direction and the magnetic field on the first permanent magnet array side strengthens. Thereby, an extremely large amount of magnetic flux is distributed in the gap between the first permanent magnet row and the second permanent magnet row.

  And the coil of the 2nd member arrange | positioned between a 1st permanent magnet row | line | column and a 2nd permanent magnet row | line | column is excited strongly, and a 2nd member vibrates with a big thrust. That is, the plate member vibrates due to a large thrust generated by the vibration member without increasing the size of the vibration member (device).

  In this way, the vibration member vibrates the plate member with a large thrust, so that the change of the existing wind power generation member is suppressed, and the low frequency noise generated by the rotation of the windmill without increasing the vibration member. Can be countered.

  The wind power generation system according to a second aspect of the present invention is the wind power generation system according to the first aspect, wherein the control member controls and operates the vibration member, and the low frequency noise generated by the rotation of the windmill. The plate member is vibrated so that a low-frequency sound having an opposite phase is generated.

  According to the above configuration, the control member controls and operates the vibration member, and vibrates the plate member so that the low frequency sound having an opposite phase to the low frequency noise generated by the rotation of the windmill is generated. For this reason, the low frequency noise produced by rotation of a windmill can be canceled effectively.

  The wind power generation system according to claim 3 of the present invention is characterized in that, in claim 1 or 2, the vibration member is operated by electric power generated by the wind power generation member.

  According to the above configuration, the vibration member is operated by electric power generated by the wind power generation member. For this reason, the vibration member can be operated without using an external power source.

  ADVANTAGE OF THE INVENTION According to this invention, the change of the existing wind power generation member can be suppressed, and the low frequency noise produced by rotation of the windmill with which the wind power generation member was equipped can be canceled, without enlarging an apparatus.

It is the schematic block diagram which showed the structure of the wind power generation system which concerns on embodiment of this invention. It is the perspective view which showed the silencer used for the wind power generation system which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along line AA (plane) in FIG. 2, showing the silencer used in the wind power generation system according to the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line BB (plane) in FIG. 2, showing the silencer used in the wind power generation system according to the embodiment of the present invention. The silencer used for the wind power generation system which concerns on embodiment of this invention is shown, and it is CC line (plane) sectional drawing in FIG. It is the schematic block diagram which showed the structure of the deformation | transformation form with respect to the wind power generation system which concerns on embodiment of this invention.

  An example of a wind power generation system according to an embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIG. 1, a wind power generation system 10 includes a wind power generation device 12 as an example of a wind power generation member that generates AC power, and low-frequency noise (for example, 50 Hz or less) generated by operating the wind power generation device 12. The sound collection member 14 as an example of a detection member for detecting the sound wave), and the silencer 16 is controlled based on the detection result of the sound collection member 14, and low-frequency noise generated by operating the wind power generator 12 is detected. A control member 18 for generating a low frequency sound to be canceled by the silencer 16 is provided.

  Further, the wind power generation system 10 includes a rectifier 36 that converts AC power generated by the wind power generator 12 into DC power, a power storage 32 that stores DC power converted by the rectifier 36, and a DC that is converted by the rectifier 36. And an inverter 34 that converts electric power into AC power (three-phase AC power) having a desired frequency [Hz] for supplying power to a supply member (not shown).

[Wind power generator]
The wind power generator 12 includes a so-called downwind type windmill 20 including three blades 20A that are rotated by wind power. Furthermore, the main body 22 with which the generator 26 which produces electric power by rotating the rotating shaft 20B (hub) with which the windmill 20 was equipped is provided is provided. A support column 24 that supports the main body 22 from below is fixed to the ground (ground).

[Silencer]
The silencer 16 is disposed away from the wind power generator 12, and the sound collection member 14 is disposed in the vicinity of the silencer 16. Further, the silencer 16 includes a flat plate member 28 whose plate surface faces in the first direction in which low frequency noise generated by the wind power generator 12 is transmitted, and a vibration member that vibrates the plate member 28. 30. Details of the silencer 16 will be described later.

[Control member]
The control member 18 controls and operates the vibration member 30 based on the low frequency noise detected by the sound collecting member 14, and the low frequency sound that mainly cancels the low frequency noise generated by the rotation of the windmill 20. The plate member 28 is vibrated so that (hereinafter referred to as “low frequency silencing”) occurs.

  Accordingly, in the present embodiment, as an example, the silencer 16 generates low-frequency noise cancellation that has an opposite phase to the low-frequency noise generated by the rotation of the windmill 20.

  Specifically, the control member 18 converts the DC power supplied from the power storage 32 into three-phase AC power, controls the voltage of the three-phase AC power, and supplies it to the vibration member 30. Desired low-frequency silencing occurs.

(Main part configuration)
Next, the silencer 16 will be described.

  As shown in FIG. 2, the silencer 16 includes a vibration member 30 and a plate member 28 fixed to the vibration member 30. The plate member 28 has a flat plate shape and is arranged so that the plate surface faces the first direction (the direction of arrow G shown in each drawing) as described above. Further, the plate member 28 has a rectangular shape (in this embodiment, a square shape) when viewed from the first direction.

  On the other hand, the vibration member 30 is configured as a linear motor including a permanent magnet in a so-called Halbach array. The vibration member 30 is supported by a stator 105 as an example of a first member having a columnar shape extending in the first direction, and is supported so as to be movable in the first direction with respect to the stator 105, and has a notch. A movable element 107 as an example of a cylindrical second member is provided.

〔stator〕
As shown in FIGS. 3 and 5, the stator 105 is configured so that the magnetic poles of a plurality of ring-shaped permanent magnets 112 are adjacent to each other so as to rotate by 90 degrees in a cross section including the central axis (see FIG. 3). The outer permanent magnet row 111 is provided as an example of the first permanent magnet row. Further, the inner permanent magnet as an example of the second permanent magnet row is configured so that the magnetic poles of the plurality of ring-shaped permanent magnets 116 are adjacent to each other so as to rotate by 90 degrees in a cross section including the central axis (see FIG. 3). The row 115 is provided so as to face the outer permanent magnet row 111 inside the outer permanent magnet row 111.

  The number of permanent magnets 112 in the outer permanent magnet row 111 is the same as the number of permanent magnets 116 in the inner permanent magnet row 115. Furthermore, the magnetic pole direction of the permanent magnet 112 magnetized in the radial direction among the permanent magnets 112 in the outer permanent magnet row 111 and the magnetic pole direction of the permanent magnet 116 magnetized in the radial direction among the permanent magnets 116 in the inner permanent magnet row 115. Are arranged on the same radius in the same manner.

  On the other hand, among the permanent magnets 112 of the outer permanent magnet row 111, the magnetic pole direction of the permanent magnet 112 magnetized in the axial direction (the same direction as the first direction in the present embodiment) and the permanent magnet of the inner permanent magnet row 115. The magnetic pole directions of the permanent magnets 116 magnetized in the axial direction out of 116 are opposite to those arranged on the same radius.

  In this configuration, in the outer permanent magnet row 111, the magnetic field on one side (outside in the present embodiment) of the array is weakened. On the other hand, on the other side of the arrangement (in this embodiment, on the inner side and inner permanent magnet row 115 side), the magnetic field is increased correspondingly, and a strong magnetic field is generated on the inner permanent magnet row 115 side of the outer permanent magnet row 111. Be able to.

  Further, in the inner permanent magnet row 115, the magnetic field on one side of the array (in the present embodiment) is weakened. On the other hand, on the other side of the arrangement (in this embodiment, on the outer side and outer permanent magnet row 111 side), the magnetic field is increased accordingly, and a strong magnetic field is generated on the outer permanent magnet row 111 side of the inner permanent magnet row 115. Be able to.

  By configuring the outer permanent magnet row 111 and the inner permanent magnet row 115 in this way, the magnetic field in the space between the outer permanent magnet row 111 and the inner permanent magnet row 115 becomes stronger, while on the other hand, the outer permanent magnet row The magnetic field hardly leaks outside the row 111 and inside the inner permanent magnet row 115. Then, an extremely large amount of radial magnetic flux is distributed in the gap between the outer permanent magnet row 111 and the inner permanent magnet row 115.

  The stator 105 is cut so as not to interfere with the mover 107 and the outer pipe 113 with the outer permanent magnet array 111 fixed to the inner inner surface, the inner pipe 117 with the inner permanent magnet array 115 fixed to the outer surface. A notch is formed, and an outer pipe 113 and a fixing plate 123 (see FIG. 2) for fixing the inner pipe 117 are provided.

  Further, in the stator 105, as shown in FIG. 2, a pair of cylindrical guides extending in the first direction at the outer one end (upper part in the drawing) and the outer other end (lower part in the drawing) of the outer pipe 113. A bar 121 is attached via guide bar support members 211 and 213.

  On the surface of the guide rod 121, as shown in FIG. 3, the electrodes 203 and 205 and the electrode 207 which are divided into two vertically in the range from the end on the guide rod support member 211 side to the guide rod support member 211. , 209 are fixed. The lead wires 141 from the respective electrodes are bundled and introduced into the control member 18 (see FIG. 2) via a lead-out path 143 provided in the guide rod support member 211.

[Movers]
On the other hand, as shown in FIGS. 3 and 4, the mover 107 has a winding ring 133 around which the three-phase coil 131 is wound, and a notch fixed to both ends of the winding ring 133. The output ring 137, a notch fixing plate 139 that fixes the end of the notch of the output ring 137, and the linear bush 135 that is attached to the end of the output ring 137 and guides the winding ring 133 along the guide rod 121. And. The plate member 28 described above is fixed to one fixed plate 139.

  The linear bush 135 includes a sliding electrode 201 that is in contact with each of the electrodes 203 and 205 and the electrodes 207 and 209 provided on the surface of the guide rod 121. The sliding electrode 201 provided in the linear bush 135 is connected to the three-phase coil 131 and is connected to the lead wire 145 passing through the output ring 137 and the lead-out path 143 provided in the linear bush 135. Accordingly, the three-phase coil 131 is electrically connected to the control member 18 (see FIG. 2) via the electrodes 203 and 205 and the electrodes 207 and 209 on the stator 105 side.

  On the other hand, as described above, the magnetic field in the space between the outer permanent magnet row 111 and the inner permanent magnet row 115 provided in the stator 105 is strong. In addition, an extremely large amount of magnetic flux in the radial direction is distributed in the gap between the outer permanent magnet row 111 and the inner permanent magnet row 115.

  On the other hand, the electrodes 203 and 205 and the electric powers 207 and 209 include a U-phase, a V-phase, a W-phase, and a neutral point of a three-phase AC current according to the voltage of the three-phase AC power converted by the control member 18. A current flows, the three-phase coil 131 is excited, and the mover 107 moves in the axial direction with a predetermined thrust.

  Here, since the three-phase coil 131 is disposed between the outer permanent magnet row 111 and the inner permanent magnet row 115, most of the magnetic flux is linked to the three-phase coil 131 at right angles. The three-phase AC power supplied from is efficiently converted into a large thrust. Thus, a large thrust can be obtained without using an iron core (coreless) for the three-phase coil 131 and without increasing the size of the vibration member 18 (device).

  In addition, since no iron core is used, the occurrence of cogging caused by moving (vibrating) the mover 107 in the axial direction is suppressed.

(Action / Effect)
Next, the operation and effect of the wind power generation system 10 will be described.

  As shown in FIG. 1, when the wind turbine 20 is rotated in the direction of the arrow by wind power, AC power is generated by the generator 26 provided in the wind power generator 12. This AC power is converted into DC power by the rectifier 36, and this DC power is converted into AC power (three-phase AC power) having a desired frequency [Hz] by the inverter 34 and supplied to the supplied member. . Further, a part of the DC power converted by the rectifier 36 is stored in the power storage 32.

  On the other hand, the rotation of the windmill 20 generates low-frequency noise and harmonic sounds accompanying the low-frequency noise (hereinafter referred to as “accompanying sound”) on the tip side of the blade 20A.

  The sound collecting member 14 detects low frequency noise having accompanying sound generated by the rotation of the windmill 20.

  The control member 18 controls and operates the vibration member 30 based on the low frequency noise provided with the accompanying wave sound detected by the sound collection member 14. Then, the control member 18 moves the plate member 28 so as to generate a low-frequency sound (for example, a low-frequency sound having an opposite phase: hereinafter referred to as “low-frequency noise reduction”) that cancels the low-frequency noise having accompanying sound. Vibrate.

  Specifically, the control member 18 converts the DC power supplied from the power storage 32 into three-phase AC power. Further, based on the detection result of the sound collecting member 14, the control member 18 controls the voltage of the three-phase AC power and supplies this power to the vibration member 30.

  When electric power is supplied to the vibration member 30, as shown in FIGS. 3 and 4, periodic excitation current is supplied to the three-phase coil 131 of the vibration member 30, and the three-phase coil 131 is periodically moved. When excited, thrust is generated, and the mover 107 vibrates along the first direction.

  As the mover 107 vibrates, as shown in FIG. 2, the plate surface of the plate member 28 vibrates along the first direction, and thereby, a low wave with an accompanying wave generated by the rotation of the windmill 20 is obtained. Low frequency noise cancellation that cancels the frequency noise occurs.

  As described above, the magnetic field in the region where the three-phase coil 131 is arranged is strengthened by adopting the linear motor including the permanent magnet in the so-called Halbach array as the vibration member 30. As a result, even if an iron core is not used for the three-phase coil 131, the three-phase coil 131 is strongly excited and is reduced in size as compared with the conventional vibrator, and the movable element 107 is pivoted with a large thrust. Vibrates at low frequency in the direction. In this way, it is possible to suppress the low-frequency noise including the accompanying wave generated by the rotation of the windmill 20 without suppressing the change of the existing wind power generator 12 and without increasing the size of the vibration member 16 (device). it can.

  Further, by adopting a linear motor including a permanent magnet in a so-called Halbach array for the vibration member 30, power can be saved and heat generation can be suppressed as compared with a conventional vibration exciter. For this reason, the vibration member 30 can be operated for a long time without using a cooling device.

  Moreover, since no iron core is provided, the occurrence of so-called cogging is suppressed. For this reason, compared with the case where the iron core is provided, the low-frequency mute that faithfully cancels the low-frequency noise can be reproduced by the muffler 16.

  Further, since the vibration member 30 is not provided with a bottom plate, the movable element 107 is movable as compared with a case where a bottomed yoke (a bottomed housing) is provided as in the case of a conventional vibrator. Stroke increases. For this reason, the low frequency muffling can be effectively reproduced by the muffler 16.

  Further, by using the flat plate member 28, the response of the plate member 28 to the vibration of the mover 107 is improved. For this reason, the low frequency muffling can be effectively reproduced by the muffler 16.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above-described embodiment, the case where the wind power generator 12, the silencer 16, and the sound collecting member 14 are one has been described. However, the present invention is not particularly limited to one, and as shown in FIG. The number of silencers and the number of sound collecting members may be plural. In this case, the entire wind power generation system may be controlled by one control member in consideration of the overall balance.

  Moreover, in the said embodiment, although the control member 18 converted the direct-current power supplied from the power storage 32 into the three-phase alternating current power, it is not necessary to supply especially direct-current power from the power storage 32, and externally. Power may be supplied from the power source.

  Moreover, in the said embodiment, although the control member 18 converted the direct-current power supplied from the electric power storage 32 into the three-phase alternating current power, you may provide the converter which converts electric power separately from a control member.

  In the above embodiment, the so-called downwind type three-blade windmill 20 has been described. However, the downwind type two blades, the upwind type, the Savonius type, the gyromill type, the Darrie type, and the like. May be.

  In the above embodiment, the magnetic poles of the permanent magnets are arranged while being rotated by 90 degrees in the axial direction. However, the magnetic poles may be rotated by 45 degrees, for example, without rotating by 90 degrees in the axial direction. Alternatively, the magnetic poles may be arranged so that the direction of the magnetic poles changes by an integer equal to 2π in the axial direction so that the magnetic field is strengthened on one side and the magnetic field is weakened on the other side.

  In the above embodiment, the outer permanent magnet row 111 and the inner permanent magnet row 115 are on the stator side, and the three-phase coil 131 is the mover side. However, the outer permanent magnet row 111 and the inner permanent magnet row 115 are on the mover side. The three-phase coil 131 may be the stator side. Furthermore, both the outer permanent magnet row 111, the inner permanent magnet row 115, and the three-phase coil 131 may be arranged on the mover side so that these move relatively.

DESCRIPTION OF SYMBOLS 10 Wind power generation system 12 Wind power generator (an example of a wind power generation member)
14 Sound collection member (an example of a detection member)
18 Control member 20 Windmill 28 Plate member 30 Excitation member 105 Stator (an example of a first member)
107 Mover (example of second member)
111 outer permanent magnet row (an example of a first permanent magnet row)
112 Permanent magnet (an example of a first permanent magnet)
115 Inner permanent magnet row (an example of a second permanent magnet row)
116 permanent magnet (an example of a second permanent magnet)
131 Three-phase coil (example of coil)

Claims (3)

A wind turbine that rotates by wind power, and a wind power generation member that generates electric power by rotating the wind turbine;
A detection member for detecting low-frequency noise generated by rotation of the windmill;
There are provided a plurality of first permanent magnets arranged in the first direction so that the direction of the magnetic pole changes by an integer equal to 2π in the first direction, the magnetic field on one side is strengthened and the magnetic field on the other side is weakened. The first permanent magnet array is disposed opposite to the first permanent magnet array on the one side of the first permanent magnet array, and the direction of the magnetic poles is changed by an integer equal to 2π in the first direction. A plurality of second permanent magnets arranged in the first direction so that the magnetic fields on the first permanent magnet array side arranged intensify and the magnetic fields on the opposite side to the first permanent magnet array side weaken each other. A first member having a second permanent magnet row, and supported so as to be relatively movable in the first direction with respect to the first member, and between the first permanent magnet row and the second permanent magnet row. A vibration member configured to include a second member having a coil at least partially disposed;
In the first direction, a plate member fixed to the end of the second member and having a plate surface facing the first direction;
The plate member is controlled so as to operate, and the plate member generates a low-frequency sound that cancels out the low-frequency noise generated by the rotation of the windmill based on the low-frequency noise detected by the detection member. A control member that vibrates,
Wind power generation system comprising.   The said control member controls and operates the said vibration member, The said plate member is vibrated so that the low frequency sound which becomes an antiphase with respect to the low frequency noise produced by the said windmill rotating may be produced. Wind power generation system as described in.   The wind power generation system according to claim 1 or 2, wherein the vibration member is operated by electric power generated by the wind power generation member.

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