A dual-stator radial flux grid-connected generator

Abstract

This invention discloses a dual-stator radial flux grid-connected generator, relating to the field of motor technology. It includes an outer stator, an inner stator, a rotor, a support shaft, and a housing. The support shaft is fixedly installed within the housing, and the inner stator, rotor, and outer stator are nested sequentially on the support shaft from the inside out. A first winding is placed in a slot on the surface of the inner stator. The first winding can be connected to the inverter of a new energy generator set. The rotor includes an inner layer of silicon steel sheets, a middle layer of magnetic shielding material, and an outer layer of silicon steel sheets. A permanent magnet is placed in a slot on the inner surface of the rotor, and a second winding is placed in a slot on the outer surface. A third winding is placed in a slot on the surface of the outer stator and fixed to the housing. The third winding is 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 radial flux grid-connected generator. Background Technology

[0002] Because various renewable energy sources are characterized by randomness, volatility, and intermittency, and their power generation principles differ, grid-connected renewable energy generation requires the energy to be collected and then converted by inverters to meet grid power quality requirements. Inverters, as static components, lack the inertia of rotating electrical machines. When power disturbances occur in the power system (such as high-power load grid connection or generator tripping), renewable energy units cannot act proactively; that is, they cannot actively respond to provide inertial support when grid frequency fluctuates. During the grid connection of renewable energy units, the extensive use of inverters reduces the inertia of the power system, posing a challenge to its stability.

[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 radial 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 radial flux grid-connected generator, comprising an outer stator, an inner stator, a rotor, a support shaft, and a housing; the support shaft is fixedly disposed within the housing, and the inner stator, the rotor, and the outer stator are nested sequentially on the support shaft from the inside to the outside;

[0007] The inner stator surface has slots to accommodate the first winding; the first winding can be connected to the inverter of the new energy generator set; the rotor includes an inner layer of silicon steel sheet, a middle layer of magnetic shielding material and an outer layer of silicon steel sheet, the inner surface of the rotor has slots to accommodate permanent magnets and the outer surface has slots to accommodate the second winding; the outer stator surface has slots to accommodate the third winding and is fixed to the outer casing; the third winding is connected to the power grid.

[0008] Preferably, it further includes a rotary drive device, which is connected to the rotor via a rotor connector and is capable of driving 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 end of the support shaft is fixedly installed on the inner side of the housing, the rotor connector is rotatably sleeved on the support shaft, and the rotor is fixedly connected to the rotor connector.

[0011] Preferably, the rotary drive device is a water turbine or a steam turbine.

[0012] Preferably, the inner silicon steel sheet, the middle magnetic shielding material, and the outer silicon steel sheet are fastened together by bolts.

[0013] The present invention achieves the following technical effects compared to the prior art:

[0014] The dual-stator radial flux grid-connected generator provided by this invention has an inner stator and rotor forming a motor, and an outer 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 grid 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.

[0015] In addition, another portion of the rotor's kinetic energy is provided by a rotary drive unit, transmitted through a coupling and rotor connector. The mechanical power provided by the rotary drive unit can coordinate with the renewable energy generator set. When the power output of the renewable 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 renewable 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

[0016] 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.

[0017] Figure 1 A schematic diagram of the external structure of the dual-stator radial flux grid-connected generator provided by the present invention;

[0018] Figure 2 for Figure 1 A sectional view;

[0019] Figure 3 This is an exploded structural diagram of the outer stator, inner stator, rotor, and support shaft.

[0020] Figure 4This is a structural schematic diagram of the support shaft and inner stator;

[0021] Figure 5 This is a schematic diagram of the rotor and rotor connector.

[0022] Figure 6 This is a cross-sectional view of the rotor;

[0023] In the diagram: 1-House; 11-House body; 12-End cover; 2-Coupling; 3-Support shaft; 4-Bearing; 5-Inner stator; 61-Rotor; 62-Rotor connector; 7-Outer stator; 8-Fixing device; 611-Permanent magnet; 612-Inner silicon steel sheet; 613-Intermediate magnetic shielding material; 614-Outer silicon steel sheet. Detailed Implementation

[0024] 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.

[0025] The purpose of this invention is to provide a dual-stator radial flux grid-connected generator to solve the problems existing in the prior art and enhance the inertia of the power system.

[0026] 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.

[0027] This invention provides a dual-stator radial flux grid-connected generator, such as... Figures 1-4 As shown, it includes an outer stator 7, an inner stator 5, a rotor 61, a support shaft 3, and a housing 1. The support shaft 3 is fixedly disposed inside the housing 1. The housing 1 consists of a shell body 11 and end caps 12 at both ends. Any one or both ends of the support shaft 3 are fixedly mounted on the end caps 12 at both ends. In some embodiments, such as... Figure 2 As shown, one end of the support shaft 3 is fixed by a fixing device; the inner stator 5, the rotor 61 and the outer stator 7 are nested on the support shaft 3 from the inside to the outside; the inner stator 5 is tightly fixedly connected to the support shaft 3, the rotor 61 is rotatably disposed on the outside of the inner stator 5, the outer stator 7 is fixedly disposed on the outside of the rotor 61, and the outer stator 7 can be fixed on the support shaft 3 or fixedly connected to the housing 11 or the end cover 12.

[0028] The first winding is housed in a slot on the surface of the inner stator 5; the first winding can be connected to the inverter of the new energy generator set; such as Figure 6As shown, the rotor 61 includes an inner layer of silicon steel sheet 612, a middle layer of magnetic shielding material 613, and an outer layer of silicon steel sheet 614. The inner surface of the rotor 61 is slotted to place a permanent magnet 611, and the outer surface is slotted to place a second winding. The outer stator 7 is slotted to place a third winding and is fixed to the outer casing. The third winding is connected to the power grid.

[0029] The dual-stator radial flux grid-connected generator provided by this invention has an inner stator 5 and a rotor 61 forming a motor, and an outer stator 7 and a rotor 61 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 grid through the third winding. The motor and the 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.

[0030] In some embodiments, the inner silicon steel sheet 612, the middle magnetic shielding material 613, and the outer silicon steel sheet 614 are fastened by bolts.

[0031] In some embodiments, in order to enhance the inertia of the power system, the dual-stator radial flux grid-connected generator provided in this embodiment also includes a rotary drive device. The rotary drive device is connected to the rotor 61 via a rotor connector 62 and can drive the rotor 61 to rotate.

[0032] In some embodiments, the end of the support shaft 3 is fixedly mounted on the inner side of the housing 1, and the rotor connector 62 is rotatably sleeved on the support shaft 3. This can be achieved by providing a bearing 4 on the support shaft 3; the rotor 61 is fixedly connected to the rotor connector 62. Specifically, as shown... Figure 5 As shown, a rotor connector 62 is provided at each end of the rotor 61. The rotor connector 62 is sleeved on the support shaft 3 and rotatably connected to the support shaft 3. One end of the rotor connector 62 extends out of the housing 1 and is connected to the torque output end of the rotary drive device through the coupling 2.

[0033] Another part of the kinetic energy of rotor 61 is provided by the rotary drive device and transmitted through rotor connector 62. When the power generated by the new energy generator set decreases, the mechanical power input is increased through the rotary drive device to make up for the power shortage; when the power generated by 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, thereby strengthening the inertia of the power system.

[0034] In some embodiments, the rotary drive device 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.

[0035] 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 radial flux grid connected generator characterized by: It includes an outer stator, an inner stator, a rotor, a support shaft, and a housing; the support shaft is fixedly disposed within the housing, and the inner stator, the rotor, and the outer stator are nested on the support shaft from the inside to the outside; The inner stator surface is slotted to house the first winding; the first winding can be connected to the inverter of the new energy generator set; the rotor includes an inner layer of silicon steel sheet, a middle layer of magnetic shielding material and an outer layer of silicon steel sheet, the inner surface of the rotor is slotted to house a permanent magnet, and the outer surface is slotted to house the second winding; the outer stator surface is slotted to house the third winding and is fixed to the housing; the third winding is connected to the power grid.

2. The dual stator radial flux permanent magnet generator of claim 1, wherein: It also includes a rotary drive device, which is connected to the rotor via a rotor connector and is capable of driving 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 radial flux permanent magnet generator of claim 2, wherein: The end of the support shaft is fixedly installed on the inner side of the housing, the rotor connector is rotatably sleeved on the support shaft, and the rotor is fixedly connected to the rotor connector.

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

5. The dual stator radial flux permanent magnet generator of claim 1, wherein: The inner silicon steel sheet, the middle magnetic shielding material, and the outer silicon steel sheet are fastened together with bolts.

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