Wireless power supply device and method of multi-transmitting and multi-receiving hydro-generator rotor monitoring system

Abstract

The invention discloses a wireless power supply device and method for a multi-transmitting and multi-receiving hydro-generator rotor monitoring system, and belongs to the technical field of online monitoring of the running state of a hydro-generator. The device comprises transmitting end equipment and receiving end equipment, the receiving end equipment is arranged at the bottom of the hydro-generator rotor; the transmitting terminal equipment is arranged below the hydro-generator rotor and the receiving terminal equipment; the transmitting terminal equipment comprises an emitting electrode controller and at least three spiral transmitting coils electrically connected with the emitting electrode controller in parallel, and the spiral transmitting coils are arranged in a regular triangle shape; the receiving end equipment comprises a receiving pole controller and at least two spiral receiving coils which are electrically connected with the receiving pole controller in parallel; the spiral receiving coils are symmetrically distributed in pairs around the center of the hydro-generator rotor; the receiving pole controller comprises an energy storage battery, and the energy storage battery is used for storing direct-current electric energy obtained by the receiving end equipment through wireless electric energy transmission and supplying power to the hydro-generator rotor monitoring system when the spiral receiving coil and the spiral transmitting coil are not in the opposite state.

Description

Technical Field

[0001] The invention belongs to the technical field of online monitoring of the operating status of a hydro-generator, and in particular relates to a wireless power supply device and method for a multi-transmitting and multi-receiving hydro-generator rotor monitoring system. Background Art

[0002] With the continuous construction of new power systems and the rapid development of smart power plant technology, the demand for online monitoring of key components in power generation systems has become increasingly urgent. In power generation stations, there are a large number of rotating components, which are in a rotating state during the production process, making it difficult to power the monitoring equipment through wired means.

[0003] As one of the core components of the hydropower generation system, the online monitoring data of the turbine generator rotor has gradually become a key reference for the condition monitoring and fault diagnosis of the turbine generator unit. However, the turbine generator rotor is in a rotating state centered on the main shaft during operation, which poses a huge challenge to the power supply and signal transmission of the monitoring system deployed in it.

[0004] At present, the rotor monitoring equipment of hydro-turbine generator mainly adopts conductive slip ring as the transmission mode of signal and energy. However, due to the friction between the collector ring and the contact of the conductive slip ring and the high-speed rotating parts, the life of the conductive slip ring is limited. With the increase of service time, the collector ring and the contact will gradually wear and fatigue, seriously affecting the reliability and performance of the conductive slip ring. At the same time, the maintenance cost of the conductive slip ring is high and it is easy to fail, resulting in high-frequency shutdown and maintenance, which causes unnecessary production losses.

[0005] As an emerging technology, magnetically coupled wireless power transmission technology can achieve medium-distance wireless power transmission between the transmitting coil and the receiving coil, which can solve the problem that the rotor of the hydro-turbine generator cannot provide wiring and power for the monitoring equipment when it is rotating.

[0006] For example, a wireless power supply device for a hydro-turbine generator rotor monitoring system provided by a Chinese utility model patent with publication number CN216162472U in the prior art includes a support frame fixed on a generator fixing part, and also includes a rectifier inverter, a rectifier filter, a switch controller and a receiving coil arranged on the circumference of the generator rotor. The rectifier inverter and the switch controller are fixed on the generator fixing part, the rectifier filter is fixed on the generator rotor, and an annular transmitting coil is fixedly connected to the support frame. The annular transmitting coil is electrically connected to the rectifier inverter, the rectifier inverter is electrically connected to the switch controller, and the receiving coil is electrically connected to the rectifier filter. This can effectively improve the power supply stability of the hydro-turbine generator rotor monitoring system, reduce the frequency of overhaul and maintenance of the power plant, improve the stability of the rotor monitoring system, and ensure the safe and stable operation of the unit.

[0007] However, the above-mentioned wireless power supply device uses a single transmitting coil and receiving coil to transmit power, and wireless power transmission will only occur when the two are facing each other. During the rotation of the rotor, the relative position between the transmitting and receiving coils changes continuously, resulting in unstable power transmission efficiency. Moreover, when the transmitting and receiving coils are not facing each other, the receiving coil cannot obtain sufficient power to support the continuous operation of the rotor monitoring system, resulting in unstable power supply to the system. Summary of the invention

[0008] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a wireless power supply device and method for a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system, which increases the number of times the multiple transmitting and receiving coils are aligned, thereby improving the efficiency of wireless power supply; the device stores excess electrical energy through an energy storage battery when the transmitting and receiving coils are aligned, and when the coils are not aligned, the energy storage device can release the stored electrical energy, thereby ensuring that the rotor monitoring system can work continuously and stably.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a wireless power supply device for a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system, comprising a transmitting end device and a receiving end device; the receiving end device is arranged on the bottom of the hydro-turbine generator rotor; the transmitting end device is arranged below the hydro-turbine generator rotor and the receiving end device; the transmitting end device comprises an emitter controller and at least three spiral transmitting coils electrically connected to the emitter controller in parallel, and the spiral transmitting coils are arranged in an equilateral triangle; the receiving end device comprises a receiving pole controller and at least two spiral receiving coils electrically connected to the receiving pole controller in parallel, and the spiral receiving coils are distributed in pairs in a straight line symmetrical manner around the center of the hydro-turbine generator rotor; the receiving pole controller comprises an energy storage battery, and the energy storage battery is used to store direct current power obtained by the receiving end device through wireless power transmission, and to power the hydro-turbine generator rotor monitoring system when the spiral receiving coils are not in a facing state with the spiral transmitting coils.

[0010] In one embodiment, the emitter controller includes a first rectifying and filtering circuit, a first voltage conversion circuit, a high-frequency inverter circuit, a first communication module and an emitter coupling compensation circuit; The first rectifier and filter circuit is used to use the mains electricity as input power and convert the mains electricity into direct current power; The first voltage conversion circuit is used to convert the DC power obtained by the first rectifier and filter circuit into a voltage to adapt to the input requirements of the high-frequency inverter circuit; The high-frequency inverter circuit is used to convert the DC power after voltage conversion into high-frequency AC power and transmit it to the emitter coupling compensation circuit; The first communication module is used to communicate with the receiving pole controller, and through the receiving pole controller, the on / off control signal of the emitter controller is used to turn off the emitter controller to save power when the spiral transmitting coil and the spiral receiving coil are not in a facing state when the rotor of the hydro-turbine generator rotates; The emitter coupling compensation circuit is used to provide capacitance and inductance compensation for the spiral transmitting coil, and interacts with the receiving electrode coupling compensation circuit in the receiving electrode controller to generate the same frequency resonance between the spiral transmitting coil and the spiral receiving coil.

[0011] In one embodiment, the receiving pole controller further includes a receiving pole coupling compensation circuit, a second rectifying and filtering circuit, a second voltage conversion circuit, a second communication module, and a battery charging control circuit; The receiving electrode coupling compensation circuit is used to provide capacitance and inductance compensation for the spiral receiving coil, and interacts with the emitter coupling compensation circuit in the emitter controller to make the spiral transmitting coil and the spiral receiving coil resonate at the same frequency; The second rectifying and filtering circuit is used to receive the high-frequency alternating current obtained by the spiral receiving coil through magnetic coupling resonant wireless power transmission, and convert it into direct current power; The second voltage conversion circuit is used to convert the DC power obtained by rectification and filtering into a voltage to adapt to the energy supply requirements of the energy storage battery and the receiving pole controller; The second communication module is used to communicate with the emitter controller to achieve switch control of the emitter controller; The battery charging control circuit is used to achieve three charging modes of constant current, constant voltage and trickle current by sampling and controlling the current and voltage of the energy storage battery charging, thereby ensuring that the energy storage battery can be stably charged.

[0012] In one embodiment, when the turbine generator rotor rotates, the spiral transmitting coil and the spiral receiving coil face each other six times per cycle.

[0013] In one embodiment, the spiral receiving coil and the spiral transmitting coil are located on parallel horizontal planes, and wireless power transmission occurs when the spiral receiving coil and the spiral transmitting coil are in a facing state.

[0014] In one embodiment, when the spiral receiving coil and the spiral transmitting coil are in a facing state, the effective transmission distance of wireless power transmission is 20 cm.

[0015] In one embodiment, the transmitting end device further includes a first electromagnetic shielding device arranged below the spiral transmitting coil; the receiving end device further includes a second electromagnetic shielding device arranged between the spiral receiving coil and the rotor of the hydro-generator.

[0016] In one embodiment, a lower frame is provided below the hydro-generator rotor, a turbine fixing structure and a lifting frame are provided between the hydro-generator rotor and the lower frame, the lifting frame is connected to the turbine fixing structure, and the transmitting end device is provided on the lifting frame.

[0017] The present invention also provides a wireless power supply method for a multi-transmitting and multi-receiving hydro-generator rotor monitoring system, comprising the following steps: S1: The emitter controller in the transmitter device converts the incoming mains electricity into high-frequency AC power, which is then transmitted to the spiral transmitting coil; S2: When any spiral transmitting coil is facing the spiral receiving coil, an alternating magnetic field with the same frequency as itself is generated in space, causing the spiral receiving coil in the magnetic field area to generate electromagnetic induction, thereby wireless power transmission occurs; the spiral receiving coil in the magnetic field area generates electromagnetic induction, thereby obtaining high-frequency alternating current power; S3: The receiving pole controller of the receiving end device receives the high-frequency AC power obtained by the spiral receiving coil; the receiving pole controller converts the high-frequency AC power into DC power; S4: During the rotation cycle of the hydro-turbine generator rotor, whenever the spiral transmitting coil is directly opposite to the spiral receiving coil, the receiving pole controller directly supplies a part of the DC power to the monitoring system of the hydro-turbine generator rotor, and uses another part of the DC power to charge the built-in energy storage battery. When the spiral transmitting coil is not directly opposite to the spiral receiving coil, the energy storage battery supplies power to the monitoring system of the hydro-turbine generator rotor.

[0018] In one embodiment, when the spiral transmitting coil and the spiral receiving coil are not aligned, the DC power stored in the energy storage battery meets all power requirements of the hydro-generator rotor monitoring system until the next time the spiral transmitting coil and the spiral receiving coil are aligned.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a wireless power supply device for a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system, which can respectively arrange multiple spiral receiving coils and transmitting coils at the bottom and below of the rotor, increase the number of facing times, improve the stability of power transmission, and integrate an energy storage battery in the receiving device to store power and power the monitoring system when it is not facing, so as to ensure the continuous operation of the system. By adopting a multi-transmitting and multi-receiving wireless power transmission structure, the efficiency of effective wireless power transmission of the rotor during the rotation cycle is significantly improved. The energy storage battery is used to store the DC power obtained by the receiving end device through wireless power transmission, and to power the hydro-turbine generator rotor monitoring system when the spiral receiving coil and the spiral transmitting coil are not in a facing state, effectively enhancing the stability of the power supply of the rotor monitoring system. In addition, multiple spiral transmitting coils are arranged in an equilateral triangle, and multiple spiral receiving coils are arranged circumferentially at the bottom of the hydro-turbine generator rotor and are arranged in a linear symmetrical manner. This arrangement can effectively increase the number and duration of facing times of the transmitting and receiving coils, and even during the rotation of the rotor, it can ensure that more transmitting-receiving coils are in a good facing state, thereby significantly improving the stability and efficiency of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure and installation and deployment position of a wireless power supply device of a multi-transmitter and multi-receiver hydro-generator rotor monitoring system of the present invention; Figure 2 It is a schematic diagram of a specific deployment method of the multi-transmitting and multi-receiving coil wireless power supply device of the present invention; Figure 3 It is a schematic diagram of the structure of the transmitting end device of the present invention; Figure 4 It is a schematic diagram of the connection structure of the transmitting end device of the present invention; Figure 5 It is a schematic diagram of the structure of the receiving end device of the present invention; Figure 6 It is a schematic diagram of the connection structure of the receiving end device of the present invention; Figure 7 A schematic diagram of the locations of a transmitting end device and a receiving end device of the present invention; In the figure: 1. transmitting end equipment; 2. receiving end equipment; 3. turbine generator rotor; 4. lower frame; 5. lifting frame; 6. turbine fixing structure; 7. transmitter controller; 8. first spiral transmitting coil; 9. second spiral transmitting coil; 10. third spiral transmitting coil; 11. first electromagnetic shielding device; 12. receiving pole controller; 13. first spiral receiving coil; 14. second spiral receiving coil; 15. second electromagnetic shielding device. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 The present invention discloses a wireless power supply device and method for a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system, comprising a transmitting end device 1 and a receiving end device 2. The transmitting end device 1 comprises a plurality of spiral transmitting coils, the number of the spiral transmitting coils is at least three, and the plurality of spiral transmitting coils are arranged in an equilateral triangle. The receiving end device 2 comprises a plurality of spiral receiving coils, the number of the spiral receiving coils is at least two, and the plurality of spiral receiving coils are arranged circumferentially at the bottom of the hydro-turbine generator rotor 3 and are arranged in a linear symmetric manner. The receiving pole controller 12 comprises an energy storage battery, the energy storage battery is used to store the DC power obtained by the receiving end device 2 through wireless power transmission, and to power the hydro-turbine generator rotor 3 monitoring system when the spiral receiving coil and the spiral transmitting coil are not in a facing state.

[0024] See also Figure 3 and Figure 4 In one embodiment, the transmitting end device 1 is fixed between the turbine generator rotor 3 and the lower frame 4, a turbine fixing structure 6 and a lifting frame 5 are arranged between the turbine generator rotor 3 and the lower frame 4, the lifting frame 5 is connected to the turbine fixing structure 6, and the transmitting end device 1 is arranged on the lifting frame 5.

[0025] The transmitting end device 1 includes a transmitter controller 7 , a first spiral transmitting coil 8 , a second spiral transmitting coil 9 , a third spiral transmitting coil 10 and a first electromagnetic shield 11 .

[0026] The first spiral transmitting coil 8, the second spiral transmitting coil 9, and the third spiral transmitting coil 10 are connected in parallel with the emitter controller 7. The emitter controller 7 generates a high-frequency signal that can drive the spiral transmitting coil and the spiral receiving coil in the receiving device 2 to generate an alternating magnetic field to perform magnetically coupled resonant wireless power transmission.

[0027] The first electromagnetic shield 11 is installed between the spiral transmitting coil and the supporting frame 5, and can shield the electromagnetic crosstalk between the spiral transmitting coil and the hydro-generator rotor 3, thereby preventing the high-frequency alternating electromagnetic field from damaging the generator set structure.

[0028] See also Figure 5 and Figure 6 The receiving end device 2 is fixed at the bottom of the turbine generator rotor 3 and rotates with the rotor when the turbine generator is in operation. The receiving end device 2 includes a receiving pole controller 12, a first spiral receiving coil 13, a second spiral receiving coil 14, and a second electromagnetic shield 15.

[0029] All the spiral receiving coils are connected in parallel with the receiving pole controller 12. When they rotate with the rotor to face the spiral transmitting coil, they use the principle of electromagnetic induction to obtain electrical energy from the alternating magnetic field generated by the spiral transmitting coil.

[0030] The receiving pole controller 12 performs rectification, filtering, and voltage conversion processing on the high-frequency AC signal obtained by the spiral receiving coil through wireless power transmission, and converts it into a DC voltage that can charge the energy storage battery integrated in the receiving pole controller 12, and powers the monitoring system in the hydro-turbine generator through the energy storage battery, wherein the second electromagnetic shielding device 15 can shield the electromagnetic crosstalk between the spiral receiving coil and the rotor 3 of the hydro-turbine generator.

[0031] The wireless power supply scheme proposed above for the rotor monitoring system of a hydro-turbine generator is intended to achieve stable and efficient power transmission. By adopting a multi-transmitting and multi-receiving wireless power transmission structure, the efficiency of effective wireless power transmission of the rotor during the rotation cycle is significantly improved. This design not only enhances the stability of the power supply of the rotor monitoring system, but also overcomes the technical difficulty of being unable to provide wired power supply due to rotor rotation, thereby ensuring the continuous operation of the monitoring system. The implementation of the present invention can effectively improve the operating safety of the hydro-turbine generator and reduce the occurrence rate of operating accidents caused by power supply problems, thereby providing a strong guarantee for the reliable operation of the hydro-turbine generator. This technological innovation has important application value in promoting the upgrade and optimization of monitoring systems in the hydropower field.

[0032] In addition, the energy storage battery can store excess electrical energy when the transmitting and receiving coils are facing each other. When the coils are not facing each other, the energy storage device can release the stored electrical energy to ensure that the rotor monitoring system can work continuously and stably.

[0033] The present invention also provides a wireless power supply method based on the wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system, comprising the following steps: S1: The transmitter controller 7 in the transmitter device 1 converts the incoming mains electricity into high-frequency AC power, which is then transmitted to a plurality of spiral transmitting coils; S2: When any spiral transmitting coil is facing the spiral receiving coil, an alternating magnetic field with the same frequency as itself is generated in space, causing the spiral receiving coil in the magnetic field area to generate electromagnetic induction, thereby wireless power transmission occurs; the spiral receiving coil in the magnetic field area generates electromagnetic induction, thereby obtaining high-frequency alternating current power; S3: The receiving pole controller 12 of the receiving end device 2 receives the high-frequency AC power obtained by the spiral receiving coil; the receiving pole controller 12 converts the high-frequency AC power into DC power; S4: During the rotation cycle of the hydro-generator rotor 3, whenever the spiral transmitting coil is directly aligned with the spiral receiving coil, the receiving pole controller 12 directly supplies a portion of the DC power to the monitoring system of the hydro-generator rotor 3, and uses the other portion of the DC power to charge the built-in energy storage battery. When the spiral transmitting coil is not directly aligned with the spiral receiving coil, the energy storage battery supplies power to the monitoring system of the hydro-generator rotor 3.

[0034] When the spiral transmitting coil and the spiral receiving coil are not facing each other, the DC power stored in the energy storage battery meets all the power requirements of the hydro-generator rotor 3 monitoring system until the next time when the spiral transmitting coil and the spiral receiving coil face each other.

[0035] In another embodiment, a wireless power supply device and method for a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system are provided. The wireless power supply device mainly includes: a transmitting end device 1 and a receiving end device 2.

[0036] See also Figure 1 The transmitting end device 1 is fixed between the turbine generator rotor 3 and the lower frame 4 through the lifting frame 5, providing non-contact power transmission for the receiving end device 2.

[0037] The receiving-end device 2 is fixed at the bottom of the turbine generator rotor 3, receives the electric energy transmitted from the transmitting-end device 1 in a non-contact manner, and rotates along with the rotor when the turbine generator is running.

[0038] See also Figure 2The transmitting end device 1 specifically includes a transmitter controller 7, a first spiral transmitting coil 8, a second spiral transmitting coil 9, a third spiral transmitting coil 10 and a first electromagnetic shield 11; See also Figure 3 and Figure 4 , the transmitter controller 7 converts the connected mains electricity into high-frequency AC power and transmits it to the first spiral transmitting coil 8, the second spiral transmitting coil 9 and the third spiral transmitting coil 10. When any spiral transmitting coil is facing the spiral receiving coil, an alternating magnetic field with the same frequency as itself is generated in space, so that the spiral receiving coil in the magnetic field area generates electromagnetic induction, thereby wireless power transmission occurs.

[0039] The first spiral transmitting coil 8, the second spiral transmitting coil 9 and the third spiral transmitting coil 10 are connected to the emitter controller 7, and driven by the high-frequency AC voltage generated by the emitter controller 7, an alternating magnetic field with the same frequency as itself is generated in space, so that the spiral receiving coils in the magnetic field area generate electromagnetic induction, thereby causing wireless power transmission.

[0040] The first electromagnetic shielding device 11 is installed between the first spiral transmitting coil 8, the second spiral transmitting coil 9 and the third spiral transmitting coil 10 and the supporting frame 5, and can shield the electromagnetic crosstalk between the first spiral transmitting coil 8, the second spiral transmitting coil 9, the third spiral transmitting coil 10 and the rotor 3 of the hydro-generator, thereby preventing the high-frequency alternating electromagnetic field from damaging the structure of the generator set.

[0041] The receiving end device 2 specifically includes a first spiral receiving coil 13 , a second spiral receiving coil 14 , a receiving pole controller 12 and a second electromagnetic shield 15 .

[0042] The first spiral receiving coil 13 and the second spiral receiving coil 14 obtain high-frequency AC power through the alternating magnetic field generated by the spiral transmitting coil, and transmit the high-frequency AC power to the receiving pole controller 12 connected thereto.

[0043] The receiving pole controller 12 converts the high-frequency AC power obtained by the first spiral receiving coil 13 and the second spiral receiving coil 14 into DC power, and can directly charge the energy storage battery integrated in the receiving pole controller 12, thereby directly powering the monitoring system of the turbine generator rotor 3.

[0044] The second electromagnetic shielding device 15 is installed between the first spiral receiving coil 13, the second spiral receiving coil 14 and the bottom of the hydro-generator rotor 3, and can shield the electromagnetic crosstalk between the first spiral receiving coil 13, the second spiral receiving coil 14 and the hydro-generator rotor 3, thereby preventing the high-frequency alternating electromagnetic field from damaging the structure of the generator set.

[0045] The emitter controller 7 comprises: a first rectifying and filtering circuit, a first voltage conversion circuit, a high-frequency inverter circuit, a first communication module and an emitter coupling compensation circuit.

[0046] Among them, the first rectifier and filter circuit uses the mains as input power and converts it into stable DC power. The first voltage conversion circuit converts the DC power obtained by rectification and filtering into voltage to adapt to the input requirements of the high-frequency inverter circuit. The high-frequency inverter circuit converts the DC power after voltage conversion into high-frequency AC power and transmits it to the emitter coupling compensation circuit. The first communication module can communicate with the receiving pole controller 12, and through the switch control signal of the receiving pole controller 12 to the emitter controller 7, when the spiral transmitting coil and the spiral receiving coil are not in a facing state when the turbine generator rotor 3 rotates, the emitter controller 7 is turned off to save energy.

[0047] The emitter coupling compensation circuit provides capacitance and inductance compensation for the first spiral transmitting coil 8, the second spiral transmitting coil 9 and the third spiral transmitting coil 10, and interacts with the receiving electrode coupling compensation circuit in the receiving electrode controller 12 to generate the same frequency resonance between the spiral transmitting coil and the spiral receiving coil, and improve the system energy transmission power and efficiency.

[0048] See also Figure 4 and Figure 5 , 6 The receiving pole controller 12 includes: a receiving pole coupling compensation circuit, a second rectifying and filtering circuit, a second voltage conversion circuit, a second communication module, a battery charging control circuit and an energy storage battery.

[0049] The receiving electrode coupling compensation circuit provides capacitance and inductance compensation for the first spiral receiving coil 13 and the second spiral receiving coil 14, and interacts with the emitter coupling compensation circuit in the emitter controller 7, so that the spiral transmitting coil and the spiral receiving coil produce the same frequency resonance, and improve the system energy transmission power and efficiency.

[0050] The second rectifying and filtering circuit receives the high-frequency alternating current obtained by the first spiral receiving coil 13 and the second spiral receiving coil 14 through magnetic coupling resonant wireless power transmission, and converts it into stable direct current power.

[0051] The second voltage conversion circuit converts the DC power obtained by rectification and filtering into a voltage to adapt to the energy supply requirements of the energy storage battery and the receiving pole controller 12.

[0052] The second communication module can communicate with the emitter controller 7 to implement switch control of the emitter controller 7 .

[0053] The battery charging control circuit samples and controls the current and voltage of the energy storage battery to achieve three charging modes: constant current, constant voltage and trickle current, ensuring that the energy storage battery can be charged stably.

[0054] The energy storage battery is integrated inside the receiving pole controller 12 and is charged by the electric energy obtained by the receiving pole controller 12 , and can directly power the monitoring system of the hydro-generator rotor 3 .

[0055] Among them, Figure 1 The lifting frame 5 shown is fixed by a turbine fixing structure 6, and lifts the transmitting end device 1 to shorten the distance between the transmitting end device 1 and the receiving end device 2, thereby reducing the wireless power transmission distance requirement.

[0056] The spiral transmitting coil and the spiral transmitting coil are on parallel horizontal planes, and wireless power transmission occurs when the two are facing each other. When the two are facing each other, wireless power transmission occurs, and the effective transmission distance is 20 cm.

[0057] like Figure 4 , Figure 6 and Figure 7 As shown, the installation positions of the first spiral transmitting coil 8, the second spiral transmitting coil 9, and the third spiral transmitting coil 10 on the plane between the bottom of the hydro-generator rotor 3 and the lower frame 4 are in the shape of an equilateral triangle, and the first spiral receiving coil 13 and the second spiral receiving coil 14 are in the shape of a straight line. When the hydro-generator rotor 3 rotates, the spiral transmitting coil and the spiral receiving coil face each other 6 times in each rotation cycle, which greatly improves the efficiency of wireless power supply.

[0058] In one implementation, the first spiral transmitting coil 8, the second spiral transmitting coil 9, the third spiral transmitting coil 10, the first spiral receiving coil 13 and the second spiral receiving coil 14 are made of three-dimensional spiral Litz wire, which improves the electromagnetic induction intensity in the vertical direction and increases the wireless power transmission distance. The first electromagnetic shielding device 11 and the second electromagnetic shielding device 15 are made of ferrite.

[0059] The present embodiment provides a wireless power supply device and method for a multi-transmitter and multi-receiver hydro-generator rotor monitoring system, so as to realize the transformation of the hydro-generator rotor monitoring equipment from the traditional contact power supply mode to the contactless power supply mode. Through this invention, many technical problems commonly existing in the application of traditional conductive slip rings, such as easy damage, unstable power transmission and low signal transmission quality, have been successfully solved. In addition, the present invention designs an efficient multi-transmitter and multi-receiver mode, thereby significantly improving the transmission efficiency of magnetically coupled wireless power transmission in the hydro-generator rotor 3 monitoring system, reducing the volume of the wireless power supply device, and reducing the complexity of installation and deployment. This innovation significantly improves the power supply mode of the hydro-generator rotor online monitoring system, enhances the operating safety of the hydro-generator, and effectively reduces the accident rate during operation.

[0060] The wireless power supply device and method of a multi-transmitting and multi-receiving hydro-turbine generator rotor monitoring system provided by the present invention are suitable for the field of online monitoring of the operating status of hydro-turbine generators. The device effectively overcomes the many defects of the traditional conductive slip ring power supply method, and realizes the passive wireless improvement of the power supply method of the hydro-turbine generator rotor online monitoring system. By adopting a multi-transmitting and multi-receiving wireless power supply mode design, the present invention significantly improves the wireless power supply efficiency of the rotor monitoring system in each rotation cycle, enhances the overall reliability of the hydro-turbine generator monitoring system, and effectively ensures the safe operation of the hydro-turbine generator set. This solution not only improves the stability and reliability of wireless power supply, but also provides more superior support for the development of hydro-turbine generator rotor monitoring technology.

[0061] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A wireless power supply device for a multi-transmitter and multi-receiver hydro-generator rotor monitoring system, characterized in that: The invention comprises a transmitting end device (1) and a receiving end device (2); the receiving end device (2) is arranged on the bottom of a hydro-generator rotor (3); the transmitting end device (1) is arranged below the hydro-generator rotor (3) and the receiving end device (2); the transmitting end device (1) comprises an emitter controller (7) and at least three spiral transmitting coils electrically connected in parallel to the emitter controller (7), the spiral transmitting coils being arranged in an equilateral triangle; the receiving end device (2) comprises a receiving pole controller (12) and at least two spiral receiving coils electrically connected in parallel to the receiving pole controller (12), the spiral receiving coils being arranged symmetrically in pairs around the center of the hydro-generator rotor (3); the receiving pole controller (12) comprises an energy storage battery, the energy storage battery being used to store direct current power obtained by the receiving end device (2) through wireless power transmission, and to supply power to a monitoring system of the hydro-generator rotor (3) when the spiral receiving coils are not in a facing state with the spiral transmitting coils.

2. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: The emitter controller (7) comprises a first rectifying and filtering circuit, a first voltage conversion circuit, a high-frequency inverter circuit, a first communication module and an emitter coupling compensation circuit; The first rectifier and filter circuit is used to use the mains electricity as input power and convert the mains electricity into direct current power; The first voltage conversion circuit is used to convert the DC power obtained by the first rectifier and filter circuit into a voltage to adapt to the input requirements of the high-frequency inverter circuit; The high-frequency inverter circuit is used to convert the DC power after voltage conversion into high-frequency AC power and transmit it to the emitter coupling compensation circuit; The first communication module is used to communicate with the receiving pole controller (12), and through the receiving pole controller (12) to control the switch signal of the emitter controller (7), when the spiral transmitting coil and the spiral receiving coil are not in a facing state when the turbine generator rotor (3) rotates, the emitter controller (7) is turned off to save electric energy; The emitter coupling compensation circuit is used to provide capacitance and inductance compensation for the spiral transmitting coil, and interacts with the receiving electrode coupling compensation circuit in the receiving electrode controller (12) to generate the same frequency resonance between the spiral transmitting coil and the spiral receiving coil.

3. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: The receiving pole controller (12) further comprises a receiving pole coupling compensation circuit, a second rectifying and filtering circuit, a second voltage conversion circuit, a second communication module, and a battery charging control circuit; The receiving electrode coupling compensation circuit is used to provide capacitance and inductance compensation for the spiral receiving coil, and interacts with the emitter coupling compensation circuit in the emitter controller (7) to make the spiral transmitting coil and the spiral receiving coil resonate at the same frequency; The second rectifying and filtering circuit is used to receive the high-frequency alternating current obtained by the spiral receiving coil through magnetic coupling resonant wireless power transmission, and convert it into direct current power; The second voltage conversion circuit is used to convert the voltage of the DC electric energy obtained by rectification and filtering to adapt to the energy supply requirements of the energy storage battery and the receiving pole controller (12); The second communication module is used to communicate with the emitter controller (7) to achieve on-off control of the emitter controller (7); The battery charging control circuit is used to achieve three charging modes of constant current, constant voltage and trickle current by sampling and controlling the current and voltage of the energy storage battery charging, thereby ensuring that the energy storage battery can be stably charged.

4. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: When the hydro-generator rotor (3) rotates, the number of times the spiral transmitting coil and the spiral receiving coil face each other is 6 times per cycle.

5. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: The spiral receiving coil and the spiral transmitting coil are located on mutually parallel horizontal planes, and wireless energy transmission occurs when the spiral receiving coil and the spiral transmitting coil are in a facing state.

6. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 5 is characterized in that: When the spiral receiving coil and the spiral transmitting coil are in a facing state, the effective transmission distance of wireless power transmission is 20cm.

7. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: The transmitting-end device (1) further comprises a first electromagnetic shield (11) arranged below the spiral transmitting coil; the receiving-end device (2) further comprises a second electromagnetic shield (15) arranged between the spiral receiving coil and the turbine generator rotor (3).

8. The wireless power supply device of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 1 is characterized in that: A lower frame (4) is arranged below the turbine generator rotor (3), a turbine fixing structure (6) and a lifting frame (5) are arranged between the turbine generator rotor (3) and the lower frame (4), the lifting frame (5) is connected to the turbine fixing structure (6), and the transmitting end device (1) is arranged on the lifting frame (5).

9. A wireless power supply method for a multi-transmitter and multi-receiver hydro-generator rotor monitoring system, characterized in that: The following steps are involved: S1: The emitter controller (7) in the transmitting end device (1) converts the incoming mains electricity into high-frequency alternating current energy, and the high-frequency alternating current energy is transmitted to the spiral transmitting coil; S2: When any spiral transmitting coil is facing the spiral receiving coil, an alternating magnetic field with the same frequency as itself is generated in space, causing the spiral receiving coil in the magnetic field area to generate electromagnetic induction, thereby wireless power transmission occurs; the spiral receiving coil in the magnetic field area generates electromagnetic induction, thereby obtaining high-frequency alternating current power; S3: The receiving pole controller (12) of the receiving end device (2) receives the high-frequency AC power energy obtained by the spiral receiving coil; the receiving pole controller (12) converts the high-frequency AC power energy into DC power energy; S4: During the rotation cycle of the hydro-generator rotor (3), whenever the spiral transmitting coil and the spiral receiving coil are aligned, the receiving pole controller (12) directly supplies a portion of the DC power to the monitoring system of the hydro-generator rotor (3), and simultaneously charges the built-in energy storage battery with another portion of the DC power. When the spiral transmitting coil and the spiral receiving coil are not aligned, the energy storage battery supplies power to the monitoring system of the hydro-generator rotor (3).

10. The wireless power supply method of the multi-transmitting and multi-receiving hydro-generator rotor monitoring system according to claim 9, characterized in that: When the spiral transmitting coil and the spiral receiving coil are not aligned, the DC power stored in the energy storage battery meets all power requirements of the hydro-generator rotor (3) monitoring system until the next time the spiral transmitting coil and the spiral receiving coil are aligned.

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