A deep well filling method and system with potential energy recovery and pressure regulation functions

Abstract

The embodiment of the present invention discloses a deep well filling method and system with potential energy recovery and pressure regulation functions, which relates to the field of deep well filling pipeline transportation technology. The filling method includes: transmitting the filling slurry from the filling station to the goaf through a pipeline; the filling slurry drives the turbine to drive the permanent magnet synchronous generator to generate electricity, and stores the electrical energy in the hybrid energy storage component; the pressure and flow at the outlet of the hydraulic turbine are collected in real time by the pressure sensor and the flow meter; according to the pressure value and flow value collected in real time by the pressure sensor and the flow meter, as well as the energy storage state of the hybrid energy storage component, the current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator and the opening adjustment amount of the electro-hydraulic proportional valve are calculated, the excitation current of the turbine excitation module of the permanent magnet synchronous generator is adjusted based on the current adjustment amount, and the opening of the electro-hydraulic proportional valve is adjusted based on the opening adjustment amount. The present invention is suitable for deep well filling scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of deep well filling pipeline transportation, and in particular to a deep well filling method and system with potential energy recovery and pressure regulation functions. Background Art

[0002] During filling in deep wells (depth > 1000m), the filling slurry is transported to the goaf through pipelines, and its gravitational potential energy is converted into kinetic energy, resulting in the pipeline outlet pressure far exceeding the filling body strength requirement.

[0003] Traditional solutions generally use throttle valves or pressure reducing valves to directly release pressure or increase pipeline resistance, which directly consumes the slurry potential energy and causes energy waste; reducing the pipeline outlet pressure through mechanical throttling can easily cause pipeline vibration, cavitation and valve wear, and cannot simultaneously meet the needs of energy recovery, precise pressure control and long-life operation of equipment. Summary of the Invention

[0004] In view of this, the present invention provides a deep well filling method and system with potential energy recovery and pressure regulation functions, which facilitates the unification of efficient energy utilization, precise control of filling pipeline pressure and long-life operation of equipment.

[0005] In the first aspect, the present invention provides a deep well filling method with potential energy recovery and pressure regulation functions, characterized in that the filling method is applied to a slurry filling system, the filling system comprising: a filling station, a goaf and a pipeline connecting the filling station and the goaf, a hydraulic turbine and a permanent magnet synchronous generator connected to the hydraulic turbine are provided at a preset position of the pipeline, the permanent magnet synchronous generator is connected to a hybrid energy storage component; a pressure sensor, a flow meter and an electro-hydraulic proportional valve are provided downstream of the hydraulic turbine; the filling method comprises: transmitting the filling slurry of the filling station to the goaf through the pipeline; the filling slurry drives the The hydraulic turbine drives the permanent magnet synchronous generator to generate electricity and stores the electrical energy in the hybrid energy storage component; the pressure value and flow value of the outlet of the hydraulic turbine are collected in real time by the pressure sensor and the flow meter; according to the pressure value and flow value collected in real time by the pressure sensor and the flow meter, as well as the energy storage state of the hybrid energy storage component, the current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator and the opening adjustment amount of the electro-hydraulic proportional valve are calculated, the excitation current of the turbine excitation module of the permanent magnet synchronous generator is adjusted based on the current adjustment amount, and the opening of the electro-hydraulic proportional valve is adjusted based on the opening adjustment amount.

[0006] Optionally, the current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator is calculated according to the following formula: :

[0007] ;in, is the pressure PID control coefficient, is the fuzzy membership weight coefficient, is the error between the actual pressure at the outlet of the hydraulic turbine and the target pressure, Fuzzy() is a fuzzy logic function, is the error between the actual flow rate at the hydraulic turbine outlet and the target flow rate, is the error between the target energy storage state and the real-time energy storage state of the hybrid energy storage component.

[0008] Optionally, the opening adjustment amount of the electro-hydraulic proportional valve is calculated according to the following formula: :

[0009] ;in, is the energy storage state compensation coefficient of the hybrid energy storage component, is the fuzzy membership weighting coefficient.

[0010] Optionally, when the outlet pressure of the hydraulic turbine exceeds a specified value, the current of the turbine excitation module of the permanent magnet synchronous generator is reduced to reduce the power generation of the permanent magnet synchronous generator, and the opening of the electro-hydraulic proportional valve is increased; conversely, the opening of the electro-hydraulic proportional valve is reduced and the current of the turbine excitation module of the permanent magnet synchronous generator is increased to increase the power generation of the permanent magnet synchronous generator.

[0011] Optionally, the filling method also includes: when the energy storage of the hybrid energy storage component is <70%, switching to a potential energy recovery priority mode; when the energy storage of the hybrid energy storage component is ≥90% or the pressure value collected by the pressure sensor fluctuates beyond a limit, switching to a pressure stabilization priority mode; wherein, the potential energy recovery priority mode is: reducing the turbine blade inclination angle of the hydraulic turbine to increase the power generation of the permanent magnet synchronous generator, and then reducing the opening of the electro-hydraulic proportional valve; the pressure stabilization priority mode is: increasing the opening of the electro-hydraulic proportional valve, and then switching the permanent magnet synchronous generator to a no-load state.

[0012] In the second aspect, the present invention provides a deep well filling system with potential energy recovery and pressure regulation functions, comprising: a filling station, a goaf, a pipeline, a potential energy recovery component, a hybrid energy storage component and an intelligent regulation component; the potential energy recovery component comprises: a hydraulic turbine generator, the hydraulic turbine generator comprises a hydraulic turbine and a permanent magnet synchronous generator; wherein the hydraulic turbine is arranged in the pipeline, and the hydraulic turbine is coaxially fixedly connected to the permanent magnet synchronous generator; the hybrid energy storage component comprises a capacitor array and a battery pack; the capacitor array is used to absorb the electrical energy of the hydraulic turbine generator; the battery pack is connected to the capacitor array for receiving and storing the buffering energy of the capacitor array; the hybrid energy storage component is electrically connected to the hydraulic turbine generator; the intelligent regulation component comprises a pressure sensor, a flow meter, a control device and an actuator; the pressure sensor and the flow meter are electrically connected to the control device; the control device and the actuator are electrically connected to control the actuator to adjust the pressure in the pipeline according to the detection results of the pressure sensor and the flow meter.

[0013] Optionally, at least two stages of potential energy recovery components are spaced apart in the pipeline.

[0014] Optionally, the pressure sensor and the flow meter are provided at the inlet of the pipeline, the outlet of the pipeline, the front of the hydraulic turbine and the rear of the hydraulic turbine.

[0015] Optionally, the actuator includes an electro-hydraulic proportional valve and a turbine excitation module; the electro-hydraulic proportional valve adjusts the flow of the filling slurry in the pipeline by adjusting the opening; the turbine excitation module adjusts the power generation power of the hydraulic turbine generator by adjusting the excitation current.

[0016] The present invention provides a deep well filling method and system with potential energy recovery and pressure regulation functions. The method drives the turbine to drive the permanent magnet synchronous generator to generate electricity by the filling slurry, converting the potential energy of the filling slurry into electrical energy, which is stored in the hybrid energy storage component for long-term storage and supply to various equipment underground. At the same time, potential energy recovery is used to generate electricity to reduce the pressure in the pipeline and the mechanical wear of the filling slurry on the pipeline, thereby increasing the service life of the equipment. The opening of the electro-hydraulic proportional valve and the current of the turbine excitation module are dynamically adjusted according to the pressure value and flow value collected in real time by the pressure sensor and the flowmeter and the energy storage state of the hybrid energy storage component to achieve stable pipeline outlet pressure. The contradiction between energy recovery and pressure stability in the deep well filling pipeline is resolved by combining potential energy power generation and pressure reduction with opening adjustment of the electro-hydraulic proportional valve, thereby achieving coordinated control of pipeline dynamic pressure and realizing the unity of efficient energy utilization, precise pressure control and long-life operation of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of a deep well filling system according to an embodiment of the present invention;

[0019] Figure 2 This is a side view of the working principle diagram of the potential energy recovery component according to an embodiment of the present invention;

[0020] Figure 3 This is a top view of the working principle diagram of the potential energy recovery component according to an embodiment of the present invention;

[0021] Figure 4 This is a flow chart of a method for regulating pipeline outlet pressure through multivariable coordinated control according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic flow chart of a deep well filling method according to an embodiment of the present invention;

[0023] In the figure: 1. Filling station; 2. Goaf; 3. Pipeline; 4. Potential energy recovery component; 41. Hydraulic turbine generator; 411. Hydraulic turbine; 412. Permanent magnet synchronous generator; 413. Turbine blades of hydraulic turbine; 42. Power line; 5. Hybrid energy storage component; 6. Intelligent control component; 61. Pressure sensor; 62. Flow meter; 63. Control device; 64. Actuator; 641. Electro-hydraulic proportional valve; 65. Signal line; 66. Control line; 7. Coupling; 8. Ceramic wear-resistant bearing frame; 9. Downhole equipment; 10. Permanent magnet rotor. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be understood that the embodiments described are only a portion 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 persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] See Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the deep well filling system according to an embodiment of the present invention. Figure 1As shown, the present invention provides a deep well filling system with potential energy recovery and pressure regulation functions, including: a filling station 1, a goaf 2, a pipeline 3, a potential energy recovery component 4, a hybrid energy storage component 5 and an intelligent regulation component 6.

[0028] The filling station 1 is responsible for processing the filling material slurry (such as tailings, waste slag, cementitious materials, etc.) into a slurry or paste that meets the requirements and transports it to the underground goaf 2 through the pipeline 3.

[0029] Pipeline 3 can be a multi-stage pipeline connected in series. This multi-stage pipeline includes vertical pipelines and horizontal transverse pipelines. This multi-stage segmented design addresses issues such as large height differences in deep well filling and pipeline pressure overload. By utilizing a graded and segmented pressure reduction technology, pipeline pressure requirements are reduced, allowing the use of lower-cost ordinary steel pipes instead of specialized high-pressure pipelines.

[0030] The potential energy recovery component 4 includes a hydraulic turbine generator 41 , which includes a hydraulic turbine 411 and a permanent magnet synchronous generator 412 ; wherein the hydraulic turbine 411 is arranged in the pipeline 3 , and the hydraulic turbine 411 and the permanent magnet synchronous generator 412 are coaxially fixedly connected.

[0031] The hydraulic turbine 411 is disposed in the pipeline 3. In some embodiments, the hydraulic turbine 411 is disposed in a vertical pipeline. In this way, the filling slurry provided by the filling station 1 drives the turbine of the hydraulic turbine 411 to rotate, converting the potential energy of the filling slurry into mechanical energy of the turbine rotation. The turbine rotation of the hydraulic turbine 411 drives the permanent magnet synchronous generator 412 to convert the mechanical energy of the turbine rotation into electrical energy, thereby realizing the conversion of the potential energy of the filling slurry into usable electrical energy. In this way, while the turbine rotation of the hydraulic turbine 411 can be used to drive the permanent magnet synchronous generator 412 to generate electricity and realize the recycling of the potential energy of the filling slurry, the hydraulic turbine 411 can also be used to increase the resistance during the slurry filling process, reduce the pressure in the pipeline 3, reduce the mechanical wear of the valves on the pipeline 3 and the inner wall of the pipeline 3, and extend the maintenance cycle.

[0032] See Figure 1 To improve the efficiency of recycling the potential energy of the filling slurry, mitigate the impact of the filling slurry falling along the vertical pipeline, and increase the falling resistance of the filling slurry in the vertical pipeline, in some embodiments, multiple hydraulic turbine generators 41 can be installed in the vertical pipeline at intervals. The multiple hydraulic turbine generators 41 convert the potential energy of the filling slurry into electrical energy. This can reduce the pressure at the outlet of the pipeline 3 and achieve multi-stage absorption and conversion of the potential energy of the filling slurry.

[0033] In some embodiments, the potential energy in the pipeline 3 is utilized in a multi-stage (stepped) manner through a potential energy recovery component. At least two stages of potential energy recovery components 4 are arranged in the pipeline 3. The potential energy of the filling slurry in the pipeline 3 is recovered through a hydraulic turbine generator 41. Combined with the hybrid energy storage component 5 to store electrical energy, the comprehensive energy utilization rate can be increased to more than 65% (traditional solutions <10%).

[0034] In some embodiments, the surface of the turbine blades 413 of the hydraulic turbine is covered with a tungsten carbide coating to increase the service life of the turbine blades 413 .

[0035] Figure 2 and Figure 3 They are respectively a side view and a top view of the working principle diagram of the potential energy recovery component according to an embodiment of the present invention. Figure 2 and Figure 3 As shown, the hydraulic turbine 411 and the permanent magnet synchronous generator 412 are coaxially connected via a coupling 7. As a key connecting component between the rotating shafts of the hydraulic turbine 411 and the permanent magnet synchronous generator 412, the coupling 7 must efficiently transmit rotational torque while compensating for displacement deviations between the two shafts, adapting to complex working conditions inside and outside the pipeline, and effectively transferring the torque of the hydraulic turbine 411 shaft to the permanent magnet synchronous generator 412 shaft for power generation.

[0036] In some embodiments, ceramic wear-resistant bearing frames are used in the rotating bearings of the hydraulic turbine 411 and the permanent magnet synchronous generator 412 to increase the service life of the hydraulic turbine generator 41 and reduce the failure rate.

[0037] In some examples, a ceramic wear-resistant bearing frame 8 is provided between the hydraulic turbine 411 and the side wall of the pipe 3. The rotating shaft of the hydraulic turbine 411 passes through a rotating bearing on the ceramic wear-resistant bearing frame 8 and is fixedly connected to the coupling 7. A sealing structure is provided between the ceramic wear-resistant bearing frame 8 and the side wall of the pipe 3, and a sealing structure is also provided between the rotating shaft of the hydraulic turbine 411 and the ceramic wear-resistant bearing frame 8.

[0038] In some embodiments, the sealing structure between the ceramic wear-resistant bearing frame 8 and the sidewall of the pipeline 5 can adopt a dual mechanical seal structure, which includes a primary seal provided on the inside of the pipeline 5 and a secondary seal provided on the outside of the pipeline 5. When the primary seal fails due to wear or pressure fluctuation, the secondary seal can still maintain the sealing effect, preventing the filling slurry from overflowing the pipeline due to seal failure, causing pressure fluctuations in the pipeline and affecting the permanent magnet synchronous generator 412.

[0039] In some embodiments, the sealing structure between the rotating shaft of the hydraulic turbine 411 and the ceramic wear-resistant bearing frame 8 may also adopt the above-mentioned double mechanical sealing structure.

[0040] See Figure 1The hybrid energy storage assembly 5 and the hydraulic turbine generator 41 are electrically connected via power lines 42, storing the electrical energy generated by the hydraulic turbine generator 41. The hybrid energy storage assembly 5 includes a capacitor array and a battery pack (not shown). The capacitor array absorbs transient electrical energy from the hydraulic turbine generator 41. The battery pack is connected to the capacitor array to receive and store the buffered energy.

[0041] In some embodiments, the capacitor array may be a supercapacitor array, and the battery pack may be a lithium-ion battery pack. The capacitor array is used to quickly absorb the transient electrical energy generated by the hydraulic turbine generator 41. The use of the supercapacitor array can instantly absorb the transient electrical energy generated by the hydraulic turbine generator 41 and smoothly output it to the lithium-ion battery pack. In one example, the conversion efficiency of transient electrical energy is >95%. The battery pack serves as a long-term energy storage module, receiving the buffering energy of the capacitor array and converting the transient electrical energy generated by the hydraulic turbine generator 41 into stable electrical energy. The electrical energy generated by the potential energy recovery component is transmitted to the hybrid energy storage component 5 via the power line 42 for long-term storage and supplied to various downhole equipment 9 for use, thereby improving the overall energy utilization rate.

[0042] The intelligent control component 6 includes: a pressure sensor 61, a flow meter 62, a control device 63 and an actuator 64; the pressure sensor 61 and the flow meter 62 are electrically connected to the control device 63 through a signal line 65; the control device 63 and the actuator 64 are electrically connected through a control line 66 to control the actuator 64 to adjust the pressure in the pipeline 3.

[0043] The pressure sensor 61 is responsible for detecting pressure changes in the system and transmitting the pressure data to the control device 63 via the signal line 65. Similarly, the flow meter 62 is used to measure the flow information of the fluid and also transmits this data to the control device 63 via the signal line 65. The control device 63 and the actuator 64 are electrically connected via the control line 66. After receiving the detection result data from the pressure sensor 61 and the flow meter 62, the control device 63 processes it according to the control logic preset by the logic module, calculates the required pressure adjustment amount based on the data of the pressure sensor 61 and the flow meter 62, and converts it into a corresponding control signal through the controller and outputs it to the actuator 64 via the control line 66. The actuator 64 receives the control signal of the control device 63 via the control line 66 and executes it according to the control signal to adjust the flow rate in the pipeline 3 and / or the power generated by the hydraulic turbine generator 41, thereby realizing the control and regulation of the pressure in the pipeline 3 by the actuator 64. The potential energy recovery component 4, the hybrid energy storage component 5 and the intelligent control component 6 together form a potential energy recovery-energy storage-pressure control collaborative architecture to achieve the unity of efficient energy utilization, precise pressure control and long-life operation of the equipment.

[0044] The deep well filling system of the present invention has the functions of potential energy recovery and pressure regulation. The potential energy of the filling slurry in the filling pipe 3 is recovered by the potential energy recovery component and converted into electrical energy, which is stored in the hybrid energy storage component 5 for long-term storage and supply to various equipment downhole. At the same time, the potential energy recovery is used to generate electricity to reduce the pressure in the pipe 3 and the mechanical wear of the filling slurry on the pipe 3, thereby increasing the service life of the equipment; the intelligent control component 6 dynamically adjusts the electro-hydraulic proportional valve 641 and the turbine excitation module according to the measurement data of the pressure sensor 61 and the flow meter 62 to achieve stable pipe outlet pressure; solves the contradiction between energy recovery and pressure stability in the deep well filling pipe, realizes coordinated control of the dynamic pressure of the pipe, and realizes efficient energy utilization.

[0045] In some embodiments, the turbine center of the hydraulic turbine 411 can be set at a position offset from the center of the pipeline 3. This allows the turbine blades 413 to extend into the interior of the pipeline 3 and contact the filling slurry, so that the filling slurry impacts the turbine blades 413 made of abrasion-resistant material instead of directly impacting the shaft of the hydraulic turbine 411, thereby increasing the service life of the shaft of the hydraulic turbine 411 and the related bearings and bearing frames.

[0046] In addition, the turbine center of the hydraulic turbine 411 is set at a position deviated from the pipeline center of the pipeline 3, so that the turbine blades 413 are eccentrically set in the pipeline 3, that is, the gap between the outer edge of the turbine blades 413 and the inner wall of one side of the pipeline 3 (the first gap) is larger than the gap between the outer edge of the turbine blades 413 and the inner wall of the other side of the pipeline 3 (the second gap). In this way, the filling slurry in the pipeline 3 can be divided into two parts of slurry flows with different flow directions through the turbine of the hydraulic turbine 411. The first part of the slurry flow maintains the original flow velocity and does not pass through the turbine, that is, it directly crosses the turbine and flows forward in the pipeline. The second part of the slurry flow passes through the turbine and drives the turbine to rotate for potential energy recovery and power generation. When the second part of the slurry flow passes through the turbine, the flow velocity of the second part of the slurry is reduced due to the blocking effect of the turbine. The slurry flow with reduced flow velocity merges with the first part of the slurry flow after passing through the turbine. This can avoid the slurry flow rate in the pipeline being too low or even blocked due to all the slurry flows passing through the turbine, or the situation where the particles in the slurry are stratified, settled and wear the pipeline due to the low slurry flow rate. This can achieve the effect of taking into account potential energy recovery, preventing pipeline blockage and reducing pipeline wear.

[0047] In some embodiments, the turbine blades 413 of the hydraulic turbine may adopt six axial flow blades, and the inclination angle of the turbine blades 413 may be variable. When the flow rate of the filling material in the pipeline 3 needs to be increased, the inclination angle between the turbine blades 413 and the axial direction of the hydraulic turbine shaft can be increased to allow more filling slurry to pass through quickly; when the flow rate of the filling material needs to be reduced, the inclination angle between the turbine blades 413 and the axial direction of the hydraulic turbine shaft is reduced to increase the flow resistance of the filling slurry in the pipeline 3. At the same time, the filling slurry is used to drive the hydraulic turbine 411 and the permanent magnet synchronous generator 412 to rotate, and the potential energy of the filling slurry is converted into electrical energy and stored in the hybrid energy storage component 5 for use by other equipment downhole.

[0048] The axial thrust generated by the hydraulic turbine 411 during operation is directly transmitted to the generator bearing, which can easily lead to bearing wear or even failure. A combined thrust bearing group can be used, which includes a tapered roller bearing and a hydraulic balance chamber, so that the tapered roller bearing bears the main axial thrust; the hydraulic balance chamber is located at the rear end of the hydraulic turbine 411, and balances part of the axial force by adjusting the pressure, thereby reducing the bearing load.

[0049] It is difficult for the generator to dissipate heat in a closed environment, and the lubricating oil is easily contaminated. In some embodiments, a dual-circulation cooling system can be used for the hydraulic turbine 411 and the permanent magnet synchronous generator 412, wherein the inner circulation uses the fluid in the pipeline 3 to drive the turbine blades 413 to rotate and the airflow generated by the spiral channel in the outer casing of the hydraulic turbine 411 to dissipate heat; the outer circulation adopts independent closed oil cooling, uses high-temperature resistant synthetic lubricating oil, and circulates heat through an external radiator to improve the heat dissipation efficiency and avoid contamination of the lubricating oil by the filling slurry.

[0050] The filling slurry in the pipeline 3 may be sucked, entangled or squeezed by the turbine blades 413, causing the turbine blades 413 to get stuck or the pipeline to be partially blocked, resulting in a decrease in power generation efficiency and even the risk of pipeline blockage. In some embodiments, a rotatable guide cover can be tilted and set in front of the contact position between the turbine blades 413 and the filling slurry in the pipeline 3 and at a position that does not affect the rotation of the turbine blades 413. The surface of the cover is provided with spiral filtering holes (the hole diameter is slightly larger than the minimum particle size of the filling slurry). When the filling slurry passes through the guide cover, the filling slurry can contact the turbine blades 413 through the guide cover and drive the hydraulic turbine 411 to rotate to generate electricity. Impurities larger than the filter holes of the guide cover are blocked by the guide cover and diverted outward along the guide cover to the edge of the pipeline 3, avoiding entering the turbine area and causing the turbine blades 413 to get stuck or the pipeline to be blocked.

[0051] In some embodiments, the turbine blade 413 can adopt a segmented hinged blade, and a flexible scraper is embedded in the end of the blade. When the turbine blade 413 rotates, the scraper swings with the blade to scrape off the residual filling material attached to the shroud or the inner wall of the pipe. The segmented blade design can adapt to the irregular shape of the filling material to prevent the turbine blade 413 from getting stuck; at the same time, when the pipeline 3 is blocked or the turbine blade 413 is stuck, the pressure of the filling slurry in the pipeline 3 can cause the flexible scraper to deform, so that the filling slurry can pass through the gap between the end of the turbine blade 413 and the pipeline 3, avoiding the risk of pipe burst or damage to the potential energy recovery component 4 due to excessive pressure caused by blockage in the pipeline 3.

[0052] In some embodiments, a transient energy absorption circuit is provided between the capacitor array and the hydraulic turbine generator 41; the transient energy absorption circuit includes an IGBT switch array and a current limiting resistor; the capacitor array and the battery pack are electrically connected via a bidirectional DC / DC converter.

[0053] In this embodiment, a transient energy absorption circuit is set between the capacitor array and the hydraulic turbine generator 41. The absorption circuit includes an IGBT switch array and a current-limiting resistor to solve the problems of power conversion efficiency and reliability when potential energy is recovered and the permanent magnet synchronous generator 412 of the hydraulic turbine generator 41 generates instantaneous high voltage and large current; to avoid damage to equipment and circuits caused by instantaneous high voltage and large current; the capacitor array and the battery pack are electrically connected through a bidirectional DC / DC converter to form a hybrid energy storage component 5, which cooperates with the potential energy recovery component and downhole equipment to realize a closed-loop design of potential energy-electric energy-power supply.

[0054] In some embodiments, the hybrid energy storage component 5 is a distributed energy storage component; the hybrid energy storage component 5 stores electrical energy and directly supplies it to downhole equipment.

[0055] In this embodiment, there are multiple hybrid energy storage components 5, which are distributed energy storage components. The positions of the distributed energy storage components are set according to the positions of the potential energy recovery components set in the pipeline 3, so that the electric energy recovered by the potential energy recovery component can be quickly stored in the nearest hybrid energy storage component 5, avoiding power loss caused by long-distance power line transmission; the stored electric energy of the hybrid energy storage component 5 is directly supplied to the downhole equipment 9 (such as the filling pump and the monitoring system) for use. The electric energy generated by the potential energy recovery component is used through the self-powered design, reducing dependence on external power supply and reducing carbon emissions from diesel generators, which is suitable for remote mining areas.

[0056] In some embodiments, a pressure sensor 61 and a flow meter 62 are provided at the inlet of the pipeline 3 , the outlet of the pipeline 3 , the front of the hydraulic turbine 411 , and the rear of the hydraulic turbine 411 .

[0057] In this embodiment, the pressure sensor 61 and the flow meter 62 are installed at key nodes of the pipeline 3. The installation locations include but are not limited to: the inlet of the pipeline 3, the outlet of the pipeline 3, in front of the hydraulic turbine 411 and after the hydraulic turbine 411. By deploying high-precision pressure sensors 61 and flow meters 62 at key nodes in the pipeline, the pressure values ​​and flow values ​​at key positions in the pipeline are collected in real time, and the corresponding electrical signals are transmitted to the control device 63 through the signal line 65.

[0058] In some embodiments, the actuator 64 includes: an electro-hydraulic proportional valve 641 and a turbine excitation module (not shown in the figure); the electro-hydraulic proportional valve 641 adjusts the flow of the filling slurry in the pipeline by adjusting the opening; the turbine excitation module adjusts the power generation power of the hydraulic turbine generator 41 by adjusting the excitation current.

[0059] The electro-hydraulic proportional valve 641 and the turbine excitation module are electrically connected to the control device 63 through a control line 66. The electro-hydraulic proportional valve 641 receives the control electrical signal of the control device 63, dynamically adjusts the opening according to the target outlet pressure calculated by the control device 63, controls the pressure in the pipeline 3, adjusts the opening within the range of 0%~100%, and responds to the control electrical signal in real time to accurately control the flow change of the filling slurry in the pipeline 3; the turbine excitation module receives the control electrical signal of the control device 63, adjusts the current of the eddy current excitation module within the range of 0~200A, thereby adjusting the overall magnetic field strength of the generator, keeping the generator output power within the set range, especially responding quickly when the load changes, and adjusting the power generation power of the potential energy recovery component 4; the turbine excitation module is integrated into the non-driving end of the permanent magnet rotor 10 in the permanent magnet synchronous generator 412, and can also be installed close to the permanent magnet synchronous generator 412, thereby improving the modularity of each device and facilitating the replacement and installation of each device when the turbine excitation module or the permanent magnet synchronous generator 412 is damaged.

[0060] The control device 63 receives data from the pressure sensor 61 and the flow meter 62 in real time, calculates the required pressure regulation amount, and outputs a control signal to the electro-hydraulic proportional valve 641 and the turbine excitation module; when the outlet pressure needs to be increased, the control signal is used to control the electro-hydraulic proportional valve 641 to increase its opening and reduce the current of the turbine excitation module, thereby reducing the overall magnetic field strength of the permanent magnet synchronous generator 412, reducing the effect of the generator cutting magnetic flux lines, reducing the power generation, and reducing the blocking effect of the turbine blades 413 of the hydraulic turbine on the filling slurry in the pipeline 3, so that the filling slurry flows quickly, thereby increasing the pipeline outlet pressure; conversely, the pipeline outlet pressure is reduced, and the opening of the electro-hydraulic proportional valve 641 and the excitation current of the turbine excitation module are optimized through dynamic adjustment and multi-data parameters to achieve stable pipeline outlet pressure.

[0061] When the current of the turbine excitation module is increased, the overall magnetic field strength of the permanent magnet synchronous generator 412 is increased, the effect of the generator cutting the magnetic flux lines is enhanced, the rotation speed of the hydraulic turbine 411 shaft is reduced, and the blocking effect of the hydraulic turbine 411 blades on the filling slurry in the pipeline 3 is enhanced, thereby reducing the flow rate of the filling slurry, which may cause the filling slurry to cause pipeline blockage in the pipeline 3; in some embodiments, a bypass pipeline can be set next to the pipeline where the potential energy recovery device is located, the inlet of the bypass pipeline is set before the potential energy recovery device on the pipeline 3, and a throttle valve is set at the inlet of the bypass pipeline; the outlet of the bypass pipeline is set after the potential energy recovery device on the pipeline 3, and a rotatable guide vane is set at the outlet of the bypass pipeline, which supports continuous adjustment within the angle range of 30-90°; when the filling system is running, the filling slurry flows out from the outlet of the bypass pipeline and intersects with the filling slurry in the pipeline 3 at an angle and momentum exchange occurs, reducing the pipeline 3. The flow rate of the filling slurry in the bypass pipe is controlled by adjusting the size of the throttle valve opening to control the flow of the filling slurry entering the bypass pipe, so as to achieve the amount of filling slurry that generates momentum exchange at the bypass pipe outlet, and by adjusting the angle of the rotatable guide vane at the bypass pipe outlet, the filling slurry in the bypass pipe can produce different flow rate reduction effects on the filling slurry in pipe 3, thereby realizing the regulation of the outlet pressure of pipe 3; at the same time, when the potential energy recovery device blocks the filling slurry in pipe 3, causing the pipe to be blocked and the adjacent potential energy recovery components stop rotating, an alarm is triggered, and the filling slurry can flow from the bypass pipe at the same time, avoiding excessive pressure in pipe 3 causing pipe 3 to burst or the filling system to stop working, affecting the project progress and economic benefits. The filling system can still continue to work and wait for maintenance personnel to repair it, shortening the length of the filling system shutdown and maintenance time, and enhancing the fault tolerance of the filling system.

[0062] Example 2

[0063] Since the turbine blades 413 of the hydraulic turbine have a blocking effect on the filling slurry in the pipeline 3, which may cause the pipeline 3 to be blocked in some cases, this embodiment is basically the same as the above embodiment, except that, in this embodiment, the hydraulic turbine 411 is installed on a slide rail so that the distance between the turbine center of the hydraulic turbine 411 and the pipeline center of the pipeline 3 can be changed; a concentration meter is provided downstream of the hydraulic turbine 411 for detecting the concentration of the filling slurry. The distance between the turbine center of the hydraulic turbine 411 and the pipeline center of the pipeline 3 is automatically adjusted as the flow rate and concentration of the filling slurry in the pipeline 3 change, thereby achieving automatic adjustment of the outlet pressure of the pipeline 3. The calculation formula is:

[0064]

[0065] Wherein, D is the distance between the turbine center of the vortex of the hydraulic turbine 411 and the center of the pipeline 3, and the sum of D and the radius of the pipeline 3 is greater than the length of the turbine blade 413; K is the comprehensive proportional coefficient used to adjust the overall sensitivity; C is the concentration of the filling slurry; α is the correction coefficient of the filling slurry concentration C, α>0; Q is the flow rate of the filling slurry per unit time; β is the correction coefficient of the flow rate Q of the filling slurry per unit time, β>0.

[0066] When Q increases or C decreases, D is automatically reduced to allow the turbine blades 413 to fully contact the filling slurry, increase the blocking effect of the turbine blades 413 on the filling slurry, thereby reducing Q and reducing the outlet pressure of the pipeline 3; conversely, when Q decreases or C increases, D is automatically increased to reduce the contact of the filling slurry with the turbine blades 413, reduce the blocking effect of the turbine blades 413 on the filling slurry, increase the flow rate Q of the filling slurry in the pipeline 3, thereby increasing the outlet pressure of the pipeline 3 and realizing automatic regulation of the outlet pressure of the pipeline 3.

[0067] Example 3

[0068] The present invention provides a deep well filling method with potential energy recovery and pressure regulation functions, which can be used in the filling system described in Example 1 or Example 2. The filling system includes: a filling station, a goaf, and a pipeline connecting the filling station and the goaf. A hydraulic turbine and a permanent magnet synchronous generator connected to the hydraulic turbine are provided at a preset position on the pipeline. The permanent magnet synchronous generator is connected to a hybrid energy storage component. A pressure sensor, a flow meter, and an electro-hydraulic proportional valve are provided downstream of the hydraulic turbine. Figure 5 This is a schematic diagram of the deep well filling method according to an embodiment of the present invention. Figure 5 , the method comprises the following steps:

[0069] S100: transporting the filling slurry from the filling station to the goaf through the pipeline.

[0070] S101. Filling slurry drives the hydraulic turbine to drive the permanent magnet synchronous generator to generate electricity, and stores the electrical energy in the hybrid energy storage component.

[0071] In this step, the hydraulic turbine and the permanent magnet synchronous generator are arranged in the pipeline, and the hydraulic turbine and the permanent magnet synchronous generator are coaxially connected. When the filling slurry flows in the pipeline and drives the hydraulic turbine to rotate, it will also drive the permanent magnet synchronous generator to generate electricity. The electrical energy generated by the permanent magnet synchronous generator is then stored in the hybrid energy storage component. The electrical energy stored in the hybrid energy storage component can be used for the turbine excitation module of the permanent magnet synchronous generator, the change of the turbine blade inclination angle of the hydraulic turbine, and electrical equipment such as pressure sensors and flow meters, thereby improving the energy utilization rate in the filling system.

[0072] S102, collecting the pressure value and flow value of the outlet of the hydraulic turbine in real time through the pressure sensor and the flow meter;

[0073] In this step, pressure sensors and flow meters are installed at key positions in the pipeline, including the filling pump outlet, the hydraulic turbine outlet and the pipeline outlet. The pressure sensors and flow meters collect the pressure and flow data values ​​at these positions in real time for adjusting the current of the turbine excitation module of the permanent magnet synchronous generator, the opening of the electro-hydraulic proportional valve and the inclination angle of the turbine blades of the hydraulic turbine.

[0074] S103. Calculate a current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator and an opening adjustment amount of the electro-hydraulic proportional valve based on the pressure value and flow value collected in real time by the pressure sensor and the flowmeter, and the energy storage state of the hybrid energy storage assembly; adjust the excitation current of the turbine excitation module of the permanent magnet synchronous generator based on the current adjustment amount; and adjust the opening of the electro-hydraulic proportional valve based on the opening adjustment amount.

[0075] In this step, based on the pressure and flow values ​​collected in real time by the pressure sensor and flowmeter, as well as the energy storage state of the hybrid energy storage component, a multivariable collaborative control algorithm is used to calculate the current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator and the opening adjustment amount of the electro-hydraulic proportional valve to reduce the control error. Then, a corresponding control signal is generated based on the calculation result, and converted into a corresponding control electrical signal and output to the turbine excitation module and the electro-hydraulic proportional valve. The excitation current of the turbine excitation module is adjusted based on the control signal converted from the current adjustment amount, and the opening of the electro-hydraulic proportional valve is adjusted based on the control signal converted from the opening adjustment amount, thereby achieving adjustment of the flow in the pipeline and the generated power of the permanent magnet synchronous generator; the energy storage state of the hybrid energy storage component 5 refers to the amount of electrical energy stored in the hybrid energy storage component 5.

[0076] In some embodiments, the current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator is calculated according to the following formula: :

[0077] ;in, is the pressure PID control coefficient, is the fuzzy membership weight coefficient, is the error between the actual pressure at the outlet of the hydraulic turbine and the target pressure, Fuzzy() is a fuzzy logic function, is the error between the actual flow rate at the hydraulic turbine outlet and the target flow rate, is the error between the target energy storage state and the real-time energy storage state of the hybrid energy storage component.

[0078] In this embodiment, the current adjustment amount of the turbine excitation module Dynamic constraints also need to be met: , where clamp is the excitation current limiting function.

[0079] In some embodiments, the opening adjustment amount of the electro-hydraulic proportional valve is calculated according to the following formula: : ;in, is the energy storage state compensation coefficient of the hybrid energy storage component, is the fuzzy membership weighting coefficient.

[0080] In this embodiment, the opening adjustment amount of the electro-hydraulic proportional valve Dynamic constraints also need to be met: , where sat is the opening saturation constraint processing function.

[0081] In some embodiments, the pressure, flow, and SOC state variables cooperate to satisfy the collaborative optimization equation: , where the current change rate satisfies the constraint: , the opening adjustment rate meets the constraints: , weight coefficient Dynamic adjustment based on the operating conditions of the energy storage system: , where tanh is the hyperbolic tangent function and std is the standard deviation calculation function.

[0082] In some embodiments, when there is a flow meter in the pipeline, The error between the actual flow rate at the outlet of the hydraulic turbine and the target flow rate is is the error vector between the actual flow rate and the target flow rate at the hydraulic turbine outlet: [ Q 1 - Q ref , Q 2 - Q ref ,... Q n - Q ref ] ^ T .

[0083] In some embodiments, the Fuzzy() fuzzy logic function includes the following rule base:

[0084]

[0085] Where, I is the current adjustment of the turbine excitation module, is the opening adjustment of the electro-hydraulic proportional valve, is the pressure threshold at the outlet of the hydraulic turbine, threshold is the pressure limit value at the outlet of the hydraulic turbine, is the flow threshold at the hydraulic turbine outlet.

[0086] In some embodiments, the current of the turbine excitation module, the opening of the electro-hydraulic proportional valve, and the pitch angle of the turbine blades of the hydraulic turbine are collaboratively optimized based on the real-time data collected by the pressure sensor and flow meter and the energy storage state of the hybrid energy storage component. Through a multivariable collaborative control algorithm, pressure, flow, and SOC state are jointly decided to achieve a dynamic balance between energy recovery and filling pipeline pressure stability. The flow chart of the multivariable collaborative control pipeline outlet pressure regulation method is shown in FIG. Figure 4 As shown, the input values ​​of the control device are the pressure values ​​and flow values ​​collected in real time by the pressure sensor and the flow meter. The logic module of the control device calculates the pressure values ​​and flow values ​​collected in real time by the pressure sensor and the flow meter, as well as the energy storage state of the hybrid energy storage component. The controller outputs the corresponding excitation current control signal of the eddy current excitation module and the opening control signal of the electro-hydraulic proportional valve. The controller transmits the control signal to the actuator through the control line for adjustment to achieve dynamic balance of the pressure in the pipeline and reduce the error between the pipeline outlet pressure and the target pressure. The controller is a PID-fuzzy composite controller; the excitation current can be adjusted in the range of 0A~200A, and the opening range of the electro-hydraulic proportional valve is 0~100%.

[0087] In some embodiments, the hybrid energy storage component and the control device are electrically connected via a signal line, and the pipeline outlet pressure and the energy storage status of the hybrid energy storage component are fed back to the control device via the signal line. The control device adjusts the excitation current of the eddy current excitation module and the opening of the electro-hydraulic proportional valve according to the pipeline outlet pressure and the energy storage status feedback of the hybrid energy storage component. Through the "power generation pressure reduction + valve adjustment" dual-mode control, the energy consumption problem of a single throttle valve is avoided. Compared with the traditional throttle valve solution, the energy consumption is reduced by 58%, the mechanical wear of valves and pipelines is reduced, the service life of the equipment is extended, the maintenance cycle is extended, the dynamic pressure coordinated control is realized, and the unity of efficient energy utilization and precise pressure control is achieved.

[0088] In some embodiments, the control signal output by the controller includes: a turbine excitation module current magnitude control signal and an electro-hydraulic proportional valve 641 opening control signal.

[0089] In this step, the control signal is transmitted through the control line 66, including: the current size control signal of the turbine excitation module and the opening control signal of the electro-hydraulic proportional valve 641; the turbine excitation module and the electro-hydraulic proportional valve 641 and other actuators 64 dynamically adjust the load of the hydraulic turbine 411 and the opening of the electro-hydraulic proportional valve 641 according to the control signal, thereby adjusting the pressure in the pipeline, and controlling the target pressure in the pipeline 3 and the outlet of the pipeline 3 while adjusting the power generation power of the potential energy recovery component 4.

[0090] In some embodiments, when the outlet pressure of the hydraulic turbine exceeds a specified value, the current of the turbine excitation module of the permanent magnet synchronous generator is reduced to reduce the power generation of the permanent magnet synchronous generator, and the opening of the electro-hydraulic proportional valve is increased; conversely, the opening of the electro-hydraulic proportional valve is reduced and the current of the turbine excitation module of the permanent magnet synchronous generator is increased to increase the power generation of the permanent magnet synchronous generator.

[0091] In this embodiment, when the outlet pressure of the hydraulic turbine exceeds a specified value, the current of the turbine excitation module of the permanent magnet synchronous generator is reduced, thereby reducing the overall magnetic field strength of the permanent magnet synchronous generator and reducing the effect of cutting magnetic lines of flux, thereby reducing the power generation of the permanent magnet synchronous generator, reducing the resistance of the permanent magnet synchronous generator shaft and the turbine blades of the hydraulic turbine generator to the filling slurry, and increasing the opening of the electro-hydraulic proportional valve to increase the flow rate of the filling slurry; otherwise, the opening of the electro-hydraulic proportional valve is reduced, and the current of the turbine excitation module of the permanent magnet synchronous generator is increased to increase the power generation of the permanent magnet synchronous generator and increase the amount of electrical energy stored in the hybrid energy storage component.

[0092] In some embodiments, when the pipeline outlet pressure exceeds 4.0 MPa, the power generation of the hydraulic turbine generator is adjusted first and the opening of the electro-hydraulic proportional valve is adjusted in conjunction with it; otherwise, the opening of the electro-hydraulic proportional valve is adjusted first and the power generation is adjusted in conjunction with it.

[0093] In this step, the pressure sensor monitors the pipeline outlet pressure in real time, and the control device calculates the required pressure regulation amount. When the pipeline outlet pressure exceeds 4.0 MPa, the power generation power of the hydraulic turbine generator is increased first, and the potential energy of the filling slurry in the pipeline is converted into electrical energy first, thereby reducing the pressure of the filling slurry on the pipeline. At the same time, the opening of the electro-hydraulic proportional valve is reduced to reduce the flow rate of the filling slurry in the pipeline, thereby avoiding damage to the pipeline caused by excessive pressure in the pipeline; when the pipeline outlet pressure is less than or equal to 4.0 MPa, the opening of the electro-hydraulic proportional valve is increased first, while reducing the power generation power of the hydraulic turbine generator, thereby increasing the flow rate of the filling slurry in the pipeline, thereby avoiding damage to the pipeline caused by impact of the filling slurry in the pipeline due to partial pipe transportation.

[0094] In some embodiments, the filling method also includes: when the energy storage of the hybrid energy storage component is <70%, switching to a potential energy recovery priority mode; when the energy storage of the hybrid energy storage component is ≥90% or the pressure value collected by the pressure sensor fluctuates beyond the limit, switching to a pressure stabilization priority mode; wherein, the potential energy recovery priority mode is: reducing the turbine blade inclination angle of the hydraulic turbine to increase the power generation power of the permanent magnet synchronous generator, and then reducing the opening of the electro-hydraulic proportional valve; the pressure stabilization priority mode is: increasing the opening of the electro-hydraulic proportional valve, and then the permanent magnet synchronous generator is switched to a no-load state.

[0095] In this embodiment, when the energy storage of the hybrid energy storage component is less than 70%, the mode can be switched to the potential energy recovery priority mode to recover the potential energy of the filling slurry in the pipeline to increase the amount of electrical energy stored in the hybrid energy storage component; when the energy storage of the hybrid energy storage component is ≥90% or the pressure value collected by the pressure sensor fluctuates beyond the limit, the mode can be switched to the pressure stability priority mode to prioritize maintaining the pressure stability in the pipeline.

[0096] The potential energy recovery priority mode is: prioritize reducing the inclination angle between the turbine blades of the hydraulic turbine and the axial direction of the hydraulic turbine shaft, increasing the resistance of the turbine blades of the hydraulic turbine to the filling slurry, so that the filling slurry drives the turbine blades to rotate rapidly, increases the shaft speed of the hydraulic turbine and the permanent magnet synchronous generator, and improves the power generation power of the permanent magnet synchronous generator; then the opening adjustment of the electro-hydraulic proportional valve is used as an auxiliary adjustment, and the opening of the electro-hydraulic proportional valve is reduced, thereby reducing the flow rate of the filling slurry to a certain extent, reducing the impact and mechanical wear of the filling slurry on the hydraulic turbine blades and pipelines, and improving the service life of the equipment.

[0097] The pressure stability priority mode is: the opening of the electro-hydraulic proportional valve is used as the main control, and the opening of the electro-hydraulic proportional valve is adjusted to a larger value first, so that the filling slurry flows out at a faster speed, reducing the pressure of the filling slurry on the pipeline, and avoiding pipe burst accidents caused by excessive pressure; then the current of the turbine excitation module is reduced, so that the permanent magnet synchronous generator is turned to a no-load state, generating a small amount of power or no power, and the pressure in the pipeline is adjusted to be stable to match the pressure fluctuation.

[0098] In some embodiments, according to the calculation formula: , calculate the generated power, where K is the turbine efficiency coefficient and Q is the real-time flow rate. The turbine blades of the hydraulic turbine 411 can be adjusted in real time according to the calculated generated power, reducing the flow fluctuation in the pipeline while reasonably utilizing the potential energy recovery component to generate power, avoiding equipment overload operation, and dynamically adjusting the generated power of the potential energy recovery component.

[0099] In some embodiments, there is a certain hysteresis in adjusting the power generation power of the potential energy recovery component 4 by adjusting the current of the turbine excitation module, thereby adjusting the pressure in the pipeline 3. When adjusting the outlet pressure of the pipeline 3 in real time, the opening of the electro-hydraulic proportional valve 641 is also calculated and adjusted to compensate for the hysteresis of the power generation power regulation of the potential energy recovery component 4, ensuring that the error between the actual outlet pressure of the pipeline 3 and the target outlet pressure of the pipeline 3 is <±0.2MPa, and the outlet pressure fluctuation range is reduced from ±1.0MPa to ±0.15MPa.

[0100] When the energy storage of the hybrid energy storage component 5 is less than 70%, the potential energy recovery priority mode is used to reduce the inclination angle between the turbine blades 413 and the axial direction of the hydraulic turbine shaft, so that the filling slurry is in full contact with the turbine blades 413, driving the hydraulic turbine 411 to rotate, increasing the power generation of the hydraulic turbine generator 41, and improving the storage capacity of the hybrid energy storage component 5. The electro-hydraulic proportional valve 641 assists in regulation, thereby increasing the power generation of the hydraulic turbine generator 41 while avoiding excessive pressure changes in the pipeline 3, which affects the pipeline outlet pressure.

[0101] When the energy storage of the hybrid energy storage component 5 is ≥90% or the pressure fluctuation exceeds the limit (>5.5MPa), the pressure stability priority mode is used, and the opening of the electro-hydraulic proportional valve 641 is controlled as the main control, and the inclination angle between the turbine blade 413 and the axial direction of the hydraulic turbine shaft is increased, so that the filling slurry can pass through quickly or the hydraulic turbine 411 is switched to the no-load mode, thereby reducing the power generation of the hydraulic turbine generator 41 and the pressure fluctuation in the pipeline 3; it can adapt to complex working conditions such as sudden flow changes and / or changes in slurry concentration in the filling pipeline 3, and avoid the failure problem of the fixed parameter control strategy.

[0102] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0103] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A deep well filling method with potential energy recovery and pressure regulation functions, characterized in that: The filling method is applied to a slurry filling system, which includes: a filling station, a goaf, and a pipeline connecting the filling station and the goaf; a hydraulic turbine and a permanent magnet synchronous generator connected to the hydraulic turbine are provided at a preset position of the pipeline, and the permanent magnet synchronous generator is connected to a hybrid energy storage component; a pressure sensor, a flow meter, and an electro-hydraulic proportional valve are provided downstream of the hydraulic turbine; a rotatable flow guide is provided at an angle in the pipeline at a position in front of the contact position between the turbine blades of the hydraulic turbine and the filling slurry and does not affect the rotation of the turbine blades of the hydraulic turbine, and a filter hole is provided on the cover surface of the flow guide; The filling method comprises: transporting the filling slurry from the filling station to the goaf through the pipeline; The filling slurry drives the hydraulic turbine to drive the permanent magnet synchronous generator to generate electricity, and stores the electrical energy in the hybrid energy storage component; The pressure sensor and the flow meter are used to collect the pressure and flow values ​​at the outlet of the hydraulic turbine in real time; Calculating a current adjustment amount of the turbine excitation module of the permanent magnet synchronous generator and an opening adjustment amount of the electro-hydraulic proportional valve based on the pressure value and flow value collected in real time by the pressure sensor and the flowmeter, and the energy storage state of the hybrid energy storage assembly; adjusting the excitation current of the turbine excitation module of the permanent magnet synchronous generator based on the current adjustment amount; and adjusting the opening of the electro-hydraulic proportional valve based on the opening adjustment amount; When the energy storage of the hybrid energy storage component is less than 70%, it switches to the potential energy recovery priority mode; when the energy storage of the hybrid energy storage component is ≥90% or the pressure value collected by the pressure sensor fluctuates beyond the limit, it switches to the pressure stabilization priority mode; wherein, the potential energy recovery priority mode is: reducing the turbine blade inclination angle of the hydraulic turbine to increase the power generation power of the permanent magnet synchronous generator, and then reducing the opening of the electro-hydraulic proportional valve; the pressure stabilization priority mode is: increasing the opening of the electro-hydraulic proportional valve, and then the permanent magnet synchronous generator is switched to a no-load state.

2. The filling method according to claim 1, characterized in that: When the outlet pressure of the hydraulic turbine exceeds a specified value, the current of the turbine excitation module of the permanent magnet synchronous generator is reduced to reduce the power generation of the permanent magnet synchronous generator, and the opening of the electro-hydraulic proportional valve is increased; conversely, the opening of the electro-hydraulic proportional valve is reduced and the current of the turbine excitation module of the permanent magnet synchronous generator is increased to increase the power generation of the permanent magnet synchronous generator.

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