A dual-stator axial flux grid-connected generator

Abstract

This invention provides a dual-stator axial flux grid-connected generator, relating to the field of motor technology. It includes a left stator, a right stator, a rotor, a support shaft, and a housing. The left stator, rotor, and right stator are sequentially arranged on the support shaft along its axial direction. The support shaft is rotatably mounted within the housing, and the rotor is fixed to the support shaft. The left and right stators are rotatably sleeved on the support shaft relative to it. A first winding is placed in a slot on the surface of the left stator facing the rotor, and this first winding can be connected to the inverter of a new energy generator set. The rotor includes a left silicon steel sheet, a middle layer of magnetic shielding material, and a right silicon steel sheet. A permanent magnet is placed on the surface of the left silicon steel sheet, and a second winding is placed in a slot on the surface of the right silicon steel sheet. A third winding is placed in a slot on the surface of the right stator facing the rotor. The third winding can be connected to the power grid. The solution provided by this invention can enhance the inertia of the power system.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a dual-stator axial flux grid-connected generator. Background Technology

[0002] With the continuous changes in the living environment, my country will continue to promote the adjustment of its energy structure and vigorously develop renewable energy. It is foreseeable that in the next few decades, the proportion of renewable energy power generation in my country will continue to increase. Due to the randomness, volatility, and intermittency of various renewable energy sources, and the differences in their power generation principles, to achieve grid-connected renewable energy power generation, the electricity must first be collected and then converted by an inverter to meet the power quality requirements of the grid. As a static component, the inverter lacks inertia compared to a rotating motor. When power disturbances occur in the power system (such as high-power load grid connection, generator tripping, etc.), renewable energy units cannot play an active role; that is, when the grid frequency fluctuates, they cannot actively respond to provide inertial support. During the grid connection of renewable energy units, the extensive use of inverters reduces the inertia of the power system, posing a challenge to the stability of the power system.

[0003] Therefore, a new solution is urgently needed to address the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-stator axial flux grid-connected generator to solve the problems existing in the prior art and enhance the inertia of the power system.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a dual-stator axial flux grid-connected generator, comprising a left stator, a right stator, a rotor, a support shaft, and a housing; the left stator, the rotor, and the right stator are sequentially arranged on the support shaft along its axial direction, the support shaft is rotatably disposed within the housing, the rotor is fixed on the support shaft, and the left stator and the right stator are rotatably sleeved on the support shaft relative to it;

[0007] The left stator has a slot on its surface facing the rotor to house the first winding, which can be connected to the inverter of the new energy generator set; the rotor includes a left silicon steel sheet, a middle layer of magnetic shielding material and a right silicon steel sheet, a permanent magnet is placed on the surface of the left silicon steel sheet, and a slot is opened on the surface of the right silicon steel sheet to house the second winding; the right stator has a slot on its surface facing the rotor to house the third winding; the third winding can be connected to the power grid.

[0008] Preferably, it further includes a rotary drive device, which is capable of driving the support shaft and causing the rotor to rotate;

[0009] When the power output of the new energy generator set decreases, the mechanical power input is increased through the rotary drive device to compensate for the power shortage; when the power output of the new energy generator set increases, the mechanical power input is reduced through the rotary drive device or the rotary drive device is stopped directly to reduce the power surplus.

[0010] Preferably, the rotary drive device is a water turbine or a steam turbine.

[0011] Preferably, the left silicon steel sheet, the middle layer of magnetic shielding material, and the right silicon steel sheet are fastened together by bolts.

[0012] The present invention achieves the following technical effects compared to the prior art:

[0013] The dual-stator axial flux grid-connected generator provided by this invention has a left stator and rotor forming a motor, and a right stator and rotor forming a generator. The motor is connected to the inverter of the new energy generator set through the first winding, and the generator is connected to the power system through the third winding. The motor and generator physically isolate the new energy generator set from the power system. Any fluctuations that occur on the side of the new energy generator set will not be transmitted to the power system, thus eliminating the interference of the inverter-dominated flexible weak grid on the power system and ensuring the inertia of the power system.

[0014] In addition, another portion of the rotor's kinetic energy is provided by a rotary drive unit, transmitted through a coupling. The mechanical power provided by the rotary drive unit can coordinate with the new energy generator set. When the power output of the new energy generator set decreases, the rotary drive unit can increase its mechanical power input to compensate for the shortage; conversely, when the power output of the new energy generator set increases, the rotary drive unit can decrease its mechanical power input to reduce the surplus. This enhances the inertia of the power system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram showing the connection of the dual-stator axial flux grid-connected generator provided by the present invention to the power system and new energy generator sets;

[0017] Figure 2 A schematic diagram of the structure of the left stator, rotor, right stator, and support shaft in the dual-stator axial flux grid-connected generator provided by the present invention;

[0018] Figure 3 This is a schematic diagram of the rotor structure;

[0019] In the diagram: 1-Dual-stator axial flux grid-connected generator; 2-New energy generator set; 3-Power system; 4-Rotary drive device; 5-Excitation device; 11-Left stator; 12-Rotor; 13-Right stator; 14-Support shaft; 15-Coupling; 16-Bearing; 121-Permanent magnet; 122-Left silicon steel sheet; 123-Intermediate layer magnetic shielding material; 124-Right silicon steel sheet. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a dual-stator axial flux grid-connected generator to solve the problems existing in the prior art and enhance the inertia of the power system.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a dual-stator axial flux grid-connected generator 1, such as... Figures 1-3 As shown, the system includes a left stator 11, a right stator 13, a rotor 12, a support shaft 14, and a housing. The left stator 11, rotor 12, and right stator 13 are sequentially arranged on the support shaft 14 along its axial direction. The support shaft 14 is rotatably mounted inside the housing, and is connected to the housing via bearings 16 on both sides. The rotor 12 is fixed to the support shaft 14. The left stator 11 and right stator 13 are rotatably mounted on the support shaft 14 relative to it. When the support shaft 14 rotates, the left stator 11 and right stator 13 remain stationary. Specifically, the left stator 11 and right stator 13 are fixedly connected to the housing, and the left stator 11 and right stator 13 are rotatable relative to the support shaft 14 via bearings.

[0024] The left stator 11 has a slot on its surface facing the rotor 12 to house the first winding, which can be connected to the inverter of the new energy generator set 2. The rotor 12 includes a left silicon steel sheet 122, a middle layer of magnetic shielding material 123, and a right silicon steel sheet 124. A permanent magnet 121 is placed on the surface of the left silicon steel sheet 122, and a second winding is placed on the surface of the right silicon steel sheet 124. The right stator 13 has a slot on its surface facing the rotor 12 to house the third winding. The third winding can be connected to the power grid.

[0025] The dual-stator axial flux grid-connected generator 1 provided by this invention has a left stator 11 and rotor 12 forming a motor, and a right stator 13 and rotor 12 forming a generator. The motor is connected to the inverter of the new energy generator set 2 through the first winding, and connected to the power system 3 through the third winding of the generator. The motor and generator physically isolate the new energy generator set 2 from the power system 3. Any fluctuations that occur on the side of the new energy generator set 2 will not be transmitted to the power system 3, thus eliminating the interference of the inverter-dominated flexible weak grid on the power system 3 and ensuring the inertia of the power system 3.

[0026] In some embodiments, the left silicon steel sheet 122, the middle layer of magnetic shielding material 123, and the right silicon steel sheet 124 are fastened by bolts.

[0027] In some embodiments, in order to enhance the inertia of the power system 3, the dual-stator axial flux grid-connected generator 1 provided in this embodiment further includes a rotary drive device 4, which can drive the support shaft 14 and drive the rotor 12 to rotate.

[0028] Another part of the kinetic energy of the rotor 12 is provided by the rotary drive device 4 and transmitted through the coupling 15. When the power generated by the new energy generator set 2 decreases, the mechanical power input of the rotary drive device 4 is increased to make up for the power shortage. When the power generated by the new energy generator set 2 increases, the mechanical power input of the rotary drive device 4 is reduced or the rotary drive device 4 is stopped directly to reduce the power surplus, thereby strengthening the inertia of the power system 3.

[0029] In some embodiments, the rotary drive device 4 may be a water turbine or a steam turbine, where the water turbine is a hydroelectric turbine and the steam turbine is a thermal power turbine.

[0030] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A dual-stator axial flux grid-connected generator, characterized in that: It includes a left stator, a right stator, a rotor, a support shaft, and a housing; the left stator, the rotor, and the right stator are sequentially arranged on the support shaft along the axial direction of the support shaft, the support shaft is rotatably disposed within the housing, the rotor is fixed on the support shaft, and the left stator and the right stator are rotatably sleeved on the support shaft relative to the support shaft; The left stator has a slot on its surface facing the rotor to house the first winding, which can be connected to the inverter of the new energy generator set; the rotor includes a left silicon steel sheet, a middle layer of magnetic shielding material and a right silicon steel sheet, a permanent magnet is placed on the surface of the left silicon steel sheet, and a slot is opened on the surface of the right silicon steel sheet to house the second winding; the right stator has a slot on its surface facing the rotor to house the third winding; the third winding can be connected to the power grid.

2. The dual-stator axial flux grid-connected generator according to claim 1, characterized in that: It also includes a rotary drive device, which can drive the support shaft and cause the rotor to rotate; When the power output of the new energy generator set decreases, the mechanical power input is increased through the rotary drive device to compensate for the power shortage; when the power output of the new energy generator set increases, the mechanical power input is reduced through the rotary drive device or the rotary drive device is stopped directly to reduce the power surplus.

3. The dual-stator axial flux grid-connected generator according to claim 2, characterized in that: The rotary drive device is a water turbine or a steam turbine.

4. The dual-stator axial flux grid-connected generator according to claim 1, characterized in that: The left silicon steel sheet, the middle layer of magnetic shielding material, and the right silicon steel sheet are fastened together with bolts.

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