Novel Dual-Stator Three-Phase Electrothermal Multi-Energy Flexible Magnetically Controlled Power Generation Device and Method

Abstract

This invention discloses a novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device and method. The device includes a heating stator, a rotor, and a power generation stator, all arranged concentrically in a ring shape. The heating stator is located inside the rotor, and the power generation stator is located outside the rotor. Multiple windings are arranged on the power generation stator, evenly spaced around the rotor. Multiple permanent magnets are also surface-mounted on the inner and outer sides of the rotor. The permanent magnets on the inner side of the rotor are located between the heating stator and the rotor, and surround the heating stator. The permanent magnets on the outer side of the rotor are located between the rotor and the power generation stator, and surround the rotor. This invention can simultaneously achieve flexible conversion of mechanical energy to electrical energy and thermal energy. Furthermore, this configuration further reduces the harmonic content of the output voltage and torque ripple, thereby improving the device's conversion efficiency and power density.

Description

Technical Field

[0001] This invention relates to the field of green power generation technology, and in particular to a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device and method. Background Technology

[0002] In recent years, the cost of wind power generation in my country has decreased rapidly, and the installed capacity of wind power has continued to rise. However, the volatility and intermittency of wind energy itself have increasingly impacted grid stability, leading to frequent wind curtailment, which has become a key factor restricting further increases in wind power installed capacity. Achieving effective wind energy storage is crucial for ensuring the grid's effective absorption of wind energy and improving wind energy utilization.

[0003] Thermal energy is one of the most in-demand forms of energy in my country's energy consumption sector. Utilizing new energy sources for heating can meet the ever-increasing demand for thermal energy in daily life. Large-capacity electrothermal energy storage systems have the advantages of low energy storage and construction costs, and minimal capacity decay during long-term storage, making them an ideal technology for achieving long-term, large-capacity energy storage in power grids.

[0004] Traditional thermal energy storage systems are low-cost solutions for mitigating wind power fluctuations and can directly meet the heat needs of some users, alleviating the problem of power system load spikes caused by heating. However, their overall efficiency is not high. Other countries have proposed the concept of wind power thermal systems that use wind energy to directly generate heat. However, this solution also has the disadvantage that it is difficult to achieve long-distance large-scale heat energy transmission after all wind energy is converted into heat energy. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to provide a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device. This device can simultaneously convert wind energy into electrical and thermal energy and achieve flexible and controllable output of both. Furthermore, this configuration results in a more compact device, further reduces the harmonic content and torque ripple of the output voltage, and further improves the device's efficiency and power density. The thermal energy generated by this device can be stored and directly supplied to heat loads, meeting the growing societal demand for thermal energy. In addition, it can proactively respond to grid demands when needed, actively generating thermal power to support the grid or absorb surplus electricity, ensuring the safe and stable operation of the grid, improving the overall conversion efficiency and utilization rate of wind energy, and avoiding the challenges of long-distance transmission of large-scale thermal energy.

[0006] The second objective of this invention is to provide a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] A novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device includes:

[0009] The heating stator, rotor, and power generation stator are arranged in a ring and concentrically. The heating stator is located inside the rotor, and the power generation stator is located outside the rotor. The power generation stator is provided with multiple windings, which are arranged at equal intervals around the rotor. The rotor is also surface-mounted with multiple permanent magnets on its inner and outer sides. The permanent magnets on the inner side of the rotor are located between the heating stator and the rotor and are arranged around the heating stator. The permanent magnets on the outer side of the rotor are located between the rotor and the power generation stator and are arranged around the rotor.

[0010] Preferably, the heating stator has an even number of through holes on the side surface near the permanent magnet, and the number of through holes is an integer multiple of the number of non-permanent magnets.

[0011] Preferably, the number of permanent magnets attached to the inner and outer surfaces of the rotor is equal.

[0012] Preferably, the permanent magnets on both the inner and outer sides of the rotor are connected in series and arranged in the same order.

[0013] Preferably, the multiple windings on the generator stator are connected in a star configuration.

[0014] Preferably, the heating stator is made of soft magnetic material, the permanent magnet is made of rare earth permanent magnet material neodymium iron boron, and the power generation stator is made of silicon steel sheet.

[0015] To achieve the above objectives, a second aspect of the present invention provides a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method, applied to the apparatus described in any one of the above claims, comprising:

[0016] When the rotor is driven by wind energy, it drives the pairs of permanent magnets mounted on the surface to rotate, forming a periodically changing rotating magnetic field.

[0017] The periodically changing rotating magnetic field induces an electromotive force in the stator windings of the generator and forms a loop when a load is connected to the external circuit, thus realizing the output of electrical energy. At the same time, the periodically changing rotating magnetic field forms an eddy current loop in the heating stator, thus realizing the output of thermal energy.

[0018] Preferably, the method further includes adjusting the motor speed and output current to achieve electrothermal ratio output control.

[0019] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method described above.

[0020] To achieve the above objectives, a fourth aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method described above.

[0021] This invention has at least the following technical effects:

[0022] (1) Compared with traditional power generation devices, the present invention can achieve simultaneous output of electrical energy and thermal energy, and can simultaneously meet the dual needs of electrical and thermal loads in social life.

[0023] (2) The present invention can directly supply heat energy to users without increasing the electrical load. In addition, it can support the power grid through thermal power conversion when the power grid needs it, so as to ensure the safe and stable operation of the power grid.

[0024] (3) Compared with traditional power generation devices, the present invention can autonomously adjust the power of heating and power generation when the load at the receiving end changes, realize the flexible conversion of electric and heat power, avoid the phenomenon of discarding excess input energy when the power demand at the receiving end decreases in traditional power generation devices, and effectively improve energy utilization efficiency.

[0025] (4) The present invention adopts a concentric double stator structure, which is more compact in structure, further reduces the harmonic content of the output voltage and torque ripple of the output device, and further improves the efficiency and power density of the device.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device according to an embodiment of the present invention.

[0028] Figure 2 This is a flowchart of a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method according to an embodiment of the present invention.

[0029] Figures 3(a)-3(b) The output phase voltage and phase current waveforms of the device in this embodiment of the invention are shown.

[0030] Figure 4 The diagram shows the waveforms of power and loss variations of the device according to an embodiment of the present invention.

[0031] Figure 5 This is a magnetic induction intensity distribution diagram of the heating stator according to an embodiment of the present invention.

[0032] Figure 6 This is a diagram showing the heating power distribution of the heating stator in an embodiment of the present invention.

[0033] Figure 7 This is a graph showing the output power variation at various rotational speeds and output currents according to an embodiment of the present invention. Detailed Implementation

[0034] The following describes this embodiment in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0035] This embodiment proposes a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device and method, which can simultaneously output electrical and thermal energy, meeting the dual demands of electricity and heat loads in daily life. It can directly supply heat energy to users without increasing the electrical load, and can also support the power grid through thermal conversion when needed, ensuring the safe and stable operation of the power grid. Compared with traditional power generation devices, the novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device proposed in this embodiment can autonomously adjust the power of heating and power generation when the load at the receiving end changes, realizing flexible conversion of electrical and thermal power. This avoids the phenomenon of discarding excess input energy when the power demand at the receiving end decreases in traditional power generation devices, effectively improving energy utilization efficiency. In addition, the novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device proposed in this embodiment adopts a concentric dual-stator structure, which is more compact in structure, further reducing the harmonic content of the output voltage and torque ripple of the output device, and further improving the device efficiency and power density.

[0036] The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device and method of this embodiment are described below with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of the structure of a novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device according to an embodiment of the present invention. Figure 1 As shown, this novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device includes a heating stator 10, a rotor 20, and a power generation stator 30, which are arranged in a ring and concentrically. The heating stator 10 is located inside the rotor 20, and the power generation stator 30 is located outside the rotor 20. The power generation stator 30 is provided with multiple windings 40, which are arranged at equal intervals around the rotor 20. In addition, multiple permanent magnets 50 are attached to the inner and outer sides of the rotor 20, respectively. The multiple permanent magnets 50 on the inner side of the rotor 20 are located between the heating stator 10 and the rotor 20 and are arranged around the heating stator 10, while the multiple permanent magnets 50 on the outer side of the rotor 20 are located between the rotor 20 and the power generation stator 30 and are arranged around the rotor 20.

[0038] In this embodiment, a structure similar to a concentric dual-stator motor is adopted. However, unlike a typical concentric dual-stator motor, the outer stator (generating stator 30) is used for power generation, while the inner stator (heating stator 10) is used for heat generation. This structure makes the device more compact and further improves power density. While the outer stator of a concentric dual-stator motor often has higher power and easier heat dissipation, the primary purpose of the device remains power generation; therefore, the outer stator is still chosen as the main power generator, while the inner stator is used for heat generation.

[0039] The device, with the above structure, can achieve flexible conversion of mechanical energy into electrical and thermal energy simultaneously, and further reduce the harmonic content of the output voltage and torque pulsation, thereby further improving the efficiency and power density of the device.

[0040] In one embodiment of the present invention, the main body of the heating part is the heating stator 10, which is made of ordinary soft magnetic material to increase the eddy current effect. At the same time, holes are drilled near the surface of the heating stator 10 on the side close to the permanent magnet 50 to improve the heating efficiency and increase the magnetic induction intensity of the remaining part, so that the magnetic field distribution is more concentrated and the heating power is increased.

[0041] The number of holes should be even to ensure the symmetry of the motor, and the number of holes should not be an integer multiple of the number of permanent magnets inside the motor to reduce torque pulsation.

[0042] In one embodiment of the present invention, the inner and outer sides of the intermediate rotor 20 adopt a surface-mount structure of permanent magnets 50. The permanent magnets 50 are made of rare earth permanent magnet material neodymium iron boron. The number of permanent magnets 50 on the inner and outer sides is equal. The permanent magnets 50 on the inner and outer sides adopt a series structure, that is, the arrangement order of the permanent magnets 50 on the inner and outer sides is the same. This magnetic circuit structure can reduce the degree of magnetic coupling between the inner and outer sides to the greatest extent.

[0043] In one embodiment of the present invention, the core of the external generator stator 30 is made of low-loss silicon steel sheets and the winding is connected in a star configuration to reduce eddy current losses and the third harmonic in the output voltage.

[0044] In this embodiment, the novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device can achieve controllable output of electrical energy, and the device's electrical energy output power is P. em ,satisfy:

[0045]

[0046] In the formula, U n I n For the line voltage and line current output from the synchronous generator port, The phase difference between the output port voltage and current is the cosine; m is the number of phases, E0 is the no-load phase potential of the synchronous generator, U is the grid voltage, and x is the phase difference between the phases. tLet θ be the armature reactance, and sin(θ) be the sine of the phase difference between the no-load phase potential of the synchronous generator and the grid voltage.

[0047] The no-load phase potential E0 satisfies:

[0048] E0 = 4K Nm fNK dp Φ (2)

[0049] Among them, K Nm is the air gap magnetic field waveform coefficient, typically taken as 1.11; N is the number of conductors in series per phase, in turns; K dp Φ is the fundamental winding coefficient, which is related to the number of slots per pole per phase, the slot pitch angle, and the winding pitch; f is the magnetic field alternation frequency, and Φ is the main flux linkage of the power generation section.

[0050] In the dq0 coordinate system, the synchronous generator torque T e It can be represented as:

[0051]

[0052] In the formula, i d i q The currents along the d and q axes are respectively; L d L q ψ represents the inductance along the d and q axes, respectively; p is the number of pole pairs of the permanent magnet 50; ψ f The magnetic flux of permanent magnet 50.

[0053] The relationship between the torque and output power of a synchronous generator satisfies:

[0054] P em =T e Ω w (4)

[0055] In the formula, Ω w This refers to the rotational speed of the synchronous generator. Therefore, the power output can be adjusted by controlling the generator's rotational speed and torque, and the torque can be controlled by adjusting the output current and regulating the dq-axis current.

[0056] The novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device can also achieve controllable thermal energy output. Assuming the electromagnetic field within the device is two-dimensionally distributed, i.e., the influence of its axial length is ignored; neglecting the displacement current of the stator and air gap, the normal current density on the stator surface is always zero. In the axial coordinate system, the device's thermal energy output power P... h satisfy:

[0057]

[0058] In the formula, σ s Let J represent electrical conductivity, l represent the axial length of the heating stator 10, and J represent the electrical conductivity.2(n) Let r and θ be the density of the nth harmonic current within region 10 of the heating stator, and r and θ be the radius coordinates and azimuth angle of the integration region of the heating stator in the polar coordinate system, with the center of the motor as the pole. r represents the distance from the pole, and θ represents the angle from the polar axis in the counterclockwise direction. R4 and R5 are the inner and outer diameters of the heating stator, respectively. The corresponding electromagnetic braking torque T can then be expressed as:

[0059]

[0060] In the formula, ω is the rotational angular velocity of rotor 20.

[0061] It can be seen that, given the basic design of the device structure, the heat generation power is mainly adjusted by adjusting the rotational angular velocity of the rotor 20.

[0062] Furthermore, a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method is proposed and applied to any of the above-mentioned devices. Figure 2 This is a flowchart illustrating a novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation method according to an embodiment of the present invention. Figure 2 As shown, the method includes:

[0063] Step S1: After being driven by wind energy, the rotor drives the pairs of permanent magnets assembled on the surface to rotate, forming a periodically changing rotating magnetic field.

[0064] Step S2: The periodically changing rotating magnetic field induces an electromotive force in the generator stator winding and forms a loop when a load is connected to the external circuit, thus realizing the output of electrical energy; at the same time, the periodically changing rotating magnetic field forms an eddy current loop in the heating stator, thus realizing the output of thermal energy.

[0065] Specifically, when the rotor is driven by other forms of energy (wind energy or other forms of mechanical energy), it drives the pairs of permanent magnets mounted on its surface to rotate, forming a periodically changing rotating magnetic field. According to the law of electromagnetic induction, this periodically changing rotating magnetic field induces an electromotive force in the stator windings. When a load is connected to the external circuit, a loop can be formed, thus enabling the output of electrical energy. Furthermore, according to the law of electromagnetic induction, the periodically changing rotating magnetic field forms eddy current loops in the heating stator, generating heat. Based on this principle, the heating stator can generate a large amount of heat. Since the generator stator uses silicon steel sheets, eddy current losses can be suppressed, and it can be considered to generate no heat. Through these two processes, the simultaneous output of mechanical energy into electrical energy and thermal energy can be achieved.

[0066] Since the output electrical energy of the device is affected by the rotation speed and output current, and the output heat energy is related to the rotation speed, the output electrothermal ratio of the device can be controlled by adjusting the rotation speed and output current.

[0067] In addition, the heat generated by the heating stator is collected by a collection device and can be used to supply the heat load. It can also support the power grid through thermal power conversion. If the quality of the output heat energy is insufficient, it can be reheated to improve the quality of the heat energy.

[0068] To verify that the novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device can simultaneously output electrical and thermal energy, a simplified simulation model was built in finite element simulation. The simulation parameters are shown in Table 1.

[0069] In the simulation, the device was operated under rated conditions, and the line voltage and current waveforms output by the device are shown in Figure 3(a) and Figure 3(b), respectively.

[0070] Table 1 Simulation Parameters

[0071]

[0072] Under these parameters and at rated operating conditions, the performance of the device is shown in Table 2.

[0073] Table 2 Performance Tables of the Device

[0074] Motor performance parameters Parameter value <![CDATA[Line voltage U AB / V]]> 380.34 Harmonic content (THD) 0.596％ Heating power / W 3316.8 Torque pulsation 0.716％ motor efficiency 97.34％ <![CDATA[Power density / (W / m 3 )]]> <![CDATA[2.4485×10 6 ]]>

[0075] The changes in power and losses of the device are as follows: Figure 4 As shown.

[0076] The magnetic induction intensity distribution diagram and the heat generation power distribution diagram of the device are as follows: Figure 5 and Figure 6 As shown, where, Figure 5 In the list, B represents magnetic flux density and A represents magnetic vector potential. Figure 6 The Ohmic-Loss value in the list represents the heating power. The device generates heat based on the eddy current effect; the greater the magnetic induction intensity, the greater the heating power. Figure 5 and Figure 6 A comparison at the same time shows that the area where the magnetic induction intensity of the heating stator is concentrated almost overlaps with the area where heat is generated.

[0077] Next, the device's rotational speed and output current are changed. The change in output current is achieved indirectly by adjusting the load in the simulation, and the output power changes as follows: Figure 7 As shown, it can be seen that the output electrical and thermal power can be smoothly adjusted by changing the device's rotation speed and output current.

[0078] In summary, the novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device of this embodiment can simultaneously convert mechanical energy into electrical energy and thermal energy. It can autonomously adjust the ratio of power generation and heating power within the device to adapt to grid demand fluctuations. The generated thermal energy can be directly supplied to the heat load or used to support the grid through thermal power generation when needed, exhibiting good economic efficiency. This embodiment adopts a concentric dual-stator structure, resulting in a more compact device structure. Under this configuration, the harmonic content of the output voltage and torque ripple are further reduced; the device efficiency and power density are further improved.

[0079] Furthermore, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, can implement the above-described method.

[0080] Furthermore, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method.

[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device, characterized in that, The device includes a heating stator, a rotor, and a power generating stator, all arranged concentrically in a ring shape. The heating stator is located inside the rotor, and the power generating stator is located outside the rotor. The power generating stator has multiple windings that are evenly spaced around the rotor. The rotor also has multiple permanent magnets attached to its inner and outer surfaces. The permanent magnets on the inner surface are located between the heating stator and the rotor, and surround the heating stator. The permanent magnets on the outer surface are located between the rotor and the power generating stator, and surround the rotor. The heating stator has an even number of through holes on its surface near the permanent magnets, and the number of through holes is an integer multiple of the number of non-permanent magnets. The number of permanent magnets attached to the inner and outer surfaces of the rotor is equal.

2. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as described in claim 1, characterized in that, The permanent magnets on both the inner and outer sides of the rotor are connected in series and arranged in the same order.

3. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as described in claim 1, characterized in that, The multiple windings on the generator stator are connected in a star configuration.

4. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as described in claim 1, characterized in that, The heating stator is made of soft magnetic material, the permanent magnet is made of rare earth permanent magnet material neodymium iron boron, and the power generation stator is made of silicon steel sheet.

5. A novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method, applied to the device as described in any one of claims 1-4, characterized in that, include: When the rotor is driven by wind energy, it drives the pairs of permanent magnets mounted on the surface to rotate, forming a periodically changing rotating magnetic field. The periodically changing rotating magnetic field induces an electromotive force in the stator windings of the generator and forms a loop when a load is connected to the external circuit, thus realizing the output of electrical energy. At the same time, the periodically changing rotating magnetic field forms an eddy current loop in the heating stator, thus realizing the output of thermal energy.

6. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method as described in claim 5, characterized in that, The method also includes adjusting the motor speed and output current to achieve electrothermal ratio output control.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in claim 5 or 6.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in claim 5 or 6.

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