Novel double-stator three-phase electric heating multi-energy flexible magnetic control power generation device and method

Abstract

The invention discloses a novel double-stator three-phase electric heating multi-energy flexible magnetic control power generation device and method, the device comprises a heating stator, a rotor and a power generation stator, the heating stator, the rotor and the power generation stator are annular and are concentrically arranged, the heating stator is located on the inner side of the rotor, and the power generation stator is located on the outer side of the rotor; the power generation stator is provided with a plurality of windings which are arranged around the rotor at equal intervals. Wherein a plurality of permanent magnets are respectively attached to the inner side and the outer side of the rotor, the plurality of permanent magnets on the inner side of the rotor are located between the heating stator and the rotor and arranged around the heating stator, and the plurality of permanent magnets on the outer side of the rotor are located between the rotor and the power generation stator and arranged around the rotor. Flexible conversion from mechanical energy to electric energy and heat energy can be achieved at the same time, the output voltage harmonic content and torque pulsation of the device are further reduced under the configuration, and therefore the conversion efficiency and power density of the device can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of green power generation, and in particular to a novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device and method. Background Art

[0002] In recent years, the cost of wind power generation in my country has dropped rapidly, and the installed capacity of wind power has continued to rise. The volatility and intermittency of wind energy have increasingly affected the stability of the power grid, and the frequent abandonment of wind power has become a key factor restricting the further increase of wind power installed capacity. The effective storage of wind energy is a key issue to ensure the effective absorption of wind energy by the power grid and improve the utilization rate of wind energy.

[0003] Thermal energy is one of the most in-demand forms of energy in my country's energy consumption. The use of new energy for heating can meet the growing demand for thermal energy in social life. Large-capacity electric thermal energy storage systems have the advantages of low energy storage and construction costs, and no obvious capacity decay under long-term energy storage conditions. They are an ideal technology for the power grid to achieve long-term and large-capacity energy storage.

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

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the first purpose of the present invention is to provide a new type of dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device, which can convert wind energy into electrical energy and thermal energy at the same time and realize flexible and controllable output of electrical energy and thermal energy. In this configuration, the device is more compact, the harmonic content and torque pulsation of the device output voltage are further reduced, the device efficiency and power density are further improved, and the thermal energy generated by the device can be stored and directly supplied to the thermal load to meet the society's growing demand for thermal energy. In addition, it can actively respond to the needs of the power grid when the power grid needs it, actively generate thermal power to support the power grid or consume surplus electrical energy, ensure the safe and stable operation of the power grid, improve the overall conversion efficiency and utilization rate of wind energy, and avoid the problem of long-distance transmission of large-scale thermal energy.

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

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

[0008] A novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device, comprising:

[0009] The heating stator, the rotor and the generating stator are annular and concentrically arranged, the heating stator is located on the inner side of the rotor, and the generating stator is located on the outer side of the rotor; a plurality of windings are arranged on the generating stator, and the plurality of windings are arranged at equal intervals around the rotor; wherein a plurality of permanent magnets are respectively attached to the inner and outer sides of the rotor, the plurality of 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, and the plurality of permanent magnets on the outer side of the rotor are located between the rotor and the generating stator, and are arranged around the rotor.

[0010] Preferably, the heat-generating stator is provided with an even number of through holes near the side surface of the permanent magnets, and the number of the through holes is an integer multiple of the number of the 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 inner and outer permanent magnets of the rotor are both connected in series and arranged in the same order.

[0013] Preferably, the multiple windings on the generating stator are connected in a star connection manner.

[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 object, the second aspect of the present invention provides a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method, which is applied to any of the above-mentioned devices, comprising:

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

[0017] The periodically changing rotating magnetic field induces an induced electromotive force in the generating stator winding, and forms a loop when a load is connected to the external circuit, thereby realizing electrical energy output; at the same time, the periodically changing rotating magnetic field forms an eddy current loop in the heating stator, thereby realizing thermal energy output.

[0018] Preferably, the method further comprises adjusting the motor speed and output current to achieve electric-to-heat ratio output regulation.

[0019] To achieve the above-mentioned object, the third aspect of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method is implemented.

[0020] To achieve the above objectives, the 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, the method described above is implemented.

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

[0022] (1) Compared with traditional power generation devices, the present invention can achieve the 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 thermal energy to users without increasing the electrical load. In addition, when the grid needs it, it can also support the grid by converting heat into electricity, thereby ensuring the safe and stable operation of the grid.

[0024] (3) Compared with traditional power generation devices, the present invention can autonomously adjust the power of heat generation and power generation when the load on the receiving end changes, thereby realizing flexible conversion of electric-thermal power. This can avoid the phenomenon of discarding excess input energy that may occur when the electric power demand on the receiving end decreases in traditional power generation devices, thereby effectively improving energy utilization efficiency.

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

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device according to an embodiment of the present invention.

[0028] Figure 2 This is a flow chart 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] Figure 3(a)-Figure 3(b) This is a waveform diagram of phase voltage and phase current output by the device according to an embodiment of the present invention.

[0030] Figure 4 It is a waveform diagram of various power and loss changes of the device according to the embodiment of the present invention.

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

[0032] Figure 6 This is a heat generation power distribution diagram of the heat generation stator according to an embodiment of the present invention.

[0033] Figure 7 1 is a graph showing the output power variation corresponding to various speeds and output currents of an embodiment of the present invention. DETAILED DESCRIPTION

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

[0035] The present embodiment proposes a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device and method, which can realize the simultaneous output of electric energy and thermal energy, can simultaneously meet the dual needs of electric and thermal loads in social life, can directly supply users with thermal energy without increasing the electric load, and can also support the power grid by converting heat into electricity when the power grid needs it, thereby 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 the present embodiment can autonomously adjust the power of heating and power generation when the load on the receiving end changes, realize the flexible conversion of electric-thermal power, avoid the phenomenon of discarding excess input energy that may occur when the electric power demand on the receiving end decreases in traditional power generation devices, and effectively improve energy utilization efficiency; in addition, the novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device proposed in the present embodiment adopts a concentric dual-stator structure, which is more compact in structure, and the output voltage harmonic content and torque pulsation of the output device are further reduced, and the equipment efficiency and power density are further improved.

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

[0037] Figure 1 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. Figure 1 As shown, the novel dual-stator three-phase electrothermal multi-energy flexible magnetically controlled power generation device comprises a heating stator 10, a rotor 20 and a power generation stator 30, which are annular and concentrically arranged, the heating stator 10 is located on the inner side of the rotor 20, and the power generation stator 30 is located on the outer side of the rotor 20; a plurality of windings 40 are arranged on the power generation stator 30, and the plurality of windings 40 are arranged at equal intervals around the rotor 20; wherein, a plurality of permanent magnets 50 are respectively attached to the inner and outer sides of the rotor 20, the plurality of 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, and the plurality of 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 double-stator motor is adopted. Unlike a general concentric double-stator motor, the outer stator of the device, i.e., the power generation stator 30, is used for power generation, while the inner stator, i.e., the heat generation stator 10, is used for heat generation. Under this structure, the device is more compact and the power density is further improved. The outer stator of the concentric double-stator motor often has greater power and is more convenient for heat dissipation, and the main purpose of the device is still to generate electricity, so the outer stator is still selected as the main power generation body, while the inner stator is used for heat generation.

[0039] The device adopts the above structure to realize flexible conversion of mechanical energy into electrical energy and thermal energy at the same time, and the harmonic content and torque pulsation of the output voltage of the equipment are further reduced, and the efficiency and power density of the equipment are further improved.

[0040] In one embodiment of the present invention, the main body of the heat-generating part is a heat-generating stator 10, and its material is selected from ordinary soft magnetic material to increase the eddy current effect. At the same time, the heat-generating stator 10 is drilled near the surface near 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 punched should be an even number to ensure the symmetry of the motor, and the number of holes punched should not be an integer multiple of the number of permanent magnets 50 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 both adopt a surface-mounted structure of permanent magnets 50, the permanent magnets 50 are made of rare earth permanent magnet material neodymium iron boron, the number of the inner and outer permanent magnets 50 is equal, and the inner and outer permanent magnets 50 adopt a series structure, that is, the arrangement order of the inner and outer permanent magnets 50 is the same. This magnetic circuit structure can minimize the degree of magnetic coupling between the inner and outer sides.

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

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

[0045]

[0046] Where U n ,I n is the line voltage and line current output from the synchronous generator port, is the cosine of the phase difference between the output port voltage and current; m is the number of phases, E0 is the no-load phase potential of the synchronous generator, U is the grid voltage, x tis the armature reactance, sin(θ) is 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 f dp Φ (2)

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

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

[0051]

[0052] In the formula, i d 、i q are the currents of d and q axes respectively; L d , L q are the inductances of the d and q axes respectively; p is the number of pole pairs of the permanent magnet 50; ψ f is the flux linkage of the permanent magnet 50.

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

[0054] P em =T e Ω w (4)

[0055] In the formula, Ω w is the speed of the synchronous generator. Therefore, the power on the generating side can be adjusted by controlling the speed and torque of the synchronous generator, and the torque can be adjusted by adjusting the output current and regulating the dq axis current.

[0056] The new dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device can also realize the controllable output of thermal energy. It is assumed that the electromagnetic field in the device is two-dimensionally distributed, that is, the influence of its axial length is not considered; the displacement current of the stator and the air gap is ignored, so the normal current density on the stator surface is always equal to zero. In the axial coordinate system, the thermal energy output power P of the device is h satisfy:

[0057]

[0058] In the formula, σ s is the conductivity, l represents the axial length of the heating stator 10, J2(n) is the density of the nth harmonic current inside the heating stator 10 area, r, θ are the radius coordinates and azimuth of the heating stator integration area in the polar coordinate system, the polar coordinate system takes the center of the motor equipment as the pole, r represents the distance from the pole, θ represents the angle from the polar axis in the counterclockwise direction, R4, R5 are the inner diameter and outer diameter of the heating stator respectively. Then the corresponding electromagnetic braking torque T can be expressed as:

[0059]

[0060] Wherein, ω is the rotation angular velocity of the rotor 20.

[0061] It can be seen that when the device structure design is basically determined, the heating 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 magnetically controlled power generation method is proposed, which can be applied to any of the above-mentioned devices. Figure 2 Flow chart of a novel dual-stator three-phase electrothermal multi-energy flexible magnetic control 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 permanent magnets installed in pairs on the surface to rotate, forming a periodically changing rotating magnetic field.

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

[0065] Specifically, after being driven by other energy (wind energy or other forms of mechanical energy), the rotor drives the paired permanent magnets mounted on the surface to rotate, forming a periodically changing rotating magnetic field. According to the law of electromagnetic induction, the periodically changing rotating magnetic field will induce an induced electromotive force in the winding of the generating stator. When the external circuit is connected to a load, a loop can be formed, and the output of electrical energy can be achieved at this time; in addition, according to the law of electromagnetic induction, the periodically changing rotating magnetic field will form an eddy current loop in the heating stator and generate heat. According to this principle, the heating stator can generate a large amount of heat. Since the generating stator uses silicon steel sheets, the eddy current loss can be suppressed, and it can be considered that it does not generate heat. Through the above two processes, the simultaneous output of mechanical energy to 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 thermal energy is related to the rotation speed, the function of regulating the output electrical-to-heat ratio of the device can be achieved by adjusting the rotation speed and output current.

[0067] In addition, the heat energy generated by the heating stator is collected by a collection device and can be supplied to the heat load. In addition, it can also support the power grid in the form of heat-to-electricity conversion. If the output heat energy quality is not enough, secondary heating can be performed to improve the heat energy quality.

[0068] In order to verify that the new dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device has the function of outputting electrical energy and thermal energy at the same time, a simple simulation model was built in the finite element simulation. The simulation parameters are shown in Table 1.

[0069] In the simulation, the device is 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 this parameter and rated operating conditions, the performance of the device is shown in Table 2.

[0073] Table 2 Performance 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 ripple 0.716％ Motor efficiency 97.34％ <![CDATA[Power density / (W / m 3 )]]> <![CDATA[2.4485×10 6 ]]>

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

[0076] The magnetic induction intensity distribution diagram and heat generation power distribution diagram of the device are as follows: Figure 5 and Figure 6 As shown, Figure 5 In the table, B represents magnetic induction intensity, and A represents magnetic vector potential; Figure 6 Ohmic-Loss in the table indicates the heat generation power. The device generates heat based on the eddy current effect. The greater the magnetic induction intensity, the greater the heat generation power. Figure 5 and Figure 6 By comparing at the same time, it can be seen that the area where the magnetic induction intensity of the heating stator is concentrated almost overlaps with the heat generation area.

[0077] Next, change the device speed and output current. The change of output current here is indirectly achieved by adjusting the load in the simulation. The output power changes as shown in Figure 7 It can be seen that the output electrical and thermal power can be adjusted smoothly by changing the device speed and output current.

[0078] In summary, the novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device of this embodiment can realize the simultaneous conversion of mechanical energy into electrical energy and thermal energy. When the power demand at the receiving end of the power grid fluctuates, it can autonomously adjust the ratio of the power generation power and the heating power inside the device to adapt to the needs of the power grid. The generated heat energy can be directly supplied to the thermal load and can also support the power grid through thermal power generation when the power grid needs it, which has good economic efficiency. This embodiment adopts a concentric dual-stator structure, and the device structure is more compact. Under this configuration, the harmonic content of the output voltage of the equipment and the torque pulsation are further reduced; the equipment efficiency and power density are further improved.

[0079] Furthermore, the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above method can be implemented.

[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. When the processor executes the computer program, the above method can be implemented.

[0081] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

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

Claims

1. A novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device, characterized in that: It includes a heating stator, a rotor and a generating stator, which are annular and concentrically arranged. The heating stator is located on the inner side of the rotor, and the generating stator is located on the outer side of the rotor. A plurality of windings are arranged on the generating stator, and the plurality of windings are arranged at equal intervals around the rotor. A plurality of permanent magnets are respectively attached to the inner and outer sides of the rotor. The plurality of 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, and the plurality of permanent magnets on the outer side of the rotor are located between the rotor and the generating stator and are arranged around the rotor.

2. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as claimed in claim 1 is characterized in that: The heating stator is provided with an even number of through holes near the side surface of the permanent magnet, and the number of the through holes is an integer multiple of the number of the non-permanent magnets.

3. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as claimed in claim 1 is characterized in that: The number of permanent magnets attached to the inner and outer surfaces of the rotor is equal.

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

5. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as claimed in claim 1 is characterized in that: The multiple windings on the power generation stator are connected in a star connection manner.

6. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation device as claimed in claim 1 is 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.

7. 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 to 6, characterized in that: include: When the rotor is driven by wind energy, it drives the permanent magnets installed on the surface in pairs to rotate, forming a periodically changing rotating magnetic field. The periodically changing rotating magnetic field induces an induced electromotive force in the generating stator winding, and forms a loop when a load is connected to the external circuit, thereby realizing electrical energy output; at the same time, the periodically changing rotating magnetic field forms an eddy current loop in the heating stator, thereby realizing thermal energy output.

8. The novel dual-stator three-phase electrothermal multi-energy flexible magnetic control power generation method as claimed in claim 7 is characterized in that: The method also includes adjusting the motor speed and output current to achieve electric-to-heat ratio output control.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method as claimed in claim 7 or 8 is implemented.

10. An electronic device comprising 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, the method as claimed in claim 7 or 8 is implemented.

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