A high voltage direct current transmission line power taking device for dynamically optimizing power taking

Abstract

The invention discloses a high-voltage direct current transmission line power taking device for dynamically optimizing power taking, comprising an energy taking device and a power taking circuit, wherein the power taking circuit comprises a rectifier circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the power taking coil of the energy taking device is connected to the rectifier circuit; the rectifier circuit is connected to the filter circuit; the filter circuit is connected to the voltage stabilizing circuit; the voltage stabilizing circuit is connected to the protection circuit; the protection circuit outputs a direct current power supply; the energy taking device comprises a circular magnetic core, a power taking coil and a reverse coil; the reverse coil is an open-circuit connection; the power taking coil and the reverse coil are wound on both sides of the circular magnetic core, the inner diameter of the circular magnetic core is larger than the outer diameter of the transmission line, and is eccentrically arranged relative to the axis of the transmission line; through advanced control strategies and technologies, efficient and reliable power taking of high-voltage direct current transmission lines is achieved, and at the same time, the system's responsiveness to load changes and environmental adaptability are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic induction power extraction of direct current transmission lines, and in particular relates to a high-voltage direct current transmission line power extraction device which dynamically optimizes power extraction. Background Art

[0002] High-voltage direct current transmission line power extraction technology has a variety of uses, mainly to support the power needs of monitoring, maintenance and other related facilities along the transmission line.

[0003] Prior art such as CN113470943B describes an electromagnetic induction power extraction device based on DC ripple, which is used to solve the infeasibility of traditional electromagnetic induction power extraction methods under stable magnetic field conditions near DC transmission lines. The device uses specific core materials and structural designs, as well as rectification, filtering and voltage stabilization circuits to extract power from harmonic currents in DC lines. Although the device can effectively extract electrical energy from DC transmission lines for use by online monitoring devices, it still has the following limitations:

[0004] 1. Inadequate response to current and load fluctuations

[0005] Since the parameters of the power-taking devices are fixed, they cannot be adjusted according to changes in current and load in the transmission lines, and they are even less able to predict changes in current and load in the transmission lines through big data and make adaptive adjustments, resulting in unstable power supply and risk of core saturation.

[0006] 2. Failure to maximize energy efficiency

[0007] The lack of a pre-regulatory mechanism means that the device cannot dynamically optimize its performance based on energy demand, which is particularly inadequate in modern power grids where energy efficiency is particularly important, such as:

[0008] Energy waste: When the load is low, the device still operates at maximum capacity, which may result in energy waste.

[0009] Efficiency fluctuations: When harmonic intensity changes or grid conditions change, a fixed-design power supply system may not be able to maintain optimal operating efficiency.

[0010] 3. Lack of flexibility and adaptability

[0011] In the context of changing grid operating conditions, the flexibility and adaptability of the power supply system become key. As the proportion of renewable energy in the grid increases, the load of the grid becomes more unstable. Fixed-design power supply devices may find it difficult to adapt to this rapidly changing environment.

[0012] Therefore, the present invention is further improved on the basis of the above. Summary of the invention

[0013] The purpose of the present invention is to provide a high-voltage direct current transmission line power supply device that dynamically optimizes the power supply. Through advanced control strategies and technologies, efficient and reliable high-voltage direct current transmission line power supply is achieved, while enhancing the system's responsiveness to load changes and environmental adaptability. Through real-time regulation and predictive adjustment, the system can not only prevent core saturation, but also significantly improve the economy and stability of the system while ensuring efficient energy conversion.

[0014] A high-voltage direct current transmission line power-taking device that dynamically optimizes power taking includes an energy taking device and a power taking circuit, wherein the power taking circuit includes a rectifier circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the power taking coil of the energy taking device is connected to the rectifier circuit; the rectifier circuit is connected to the filter circuit; the filter circuit is connected to the voltage stabilizing circuit; the voltage stabilizing circuit is connected to the protection circuit; the protection circuit outputs a direct current power supply; the energy taking device includes a circular magnetic core, a power taking coil and a reverse coil; the reverse coil is an open-circuit connection; the power taking coil and the reverse coil are wound on both sides of the circular magnetic core, the inner diameter of the circular magnetic core is larger than the outer diameter of the transmission line, and is eccentrically arranged relative to the axis of the transmission line, and a driving device can drive the circular magnetic core to rotate to adjust the magnetic flux ratio of the power taking coil and the reverse coil.

[0015] Among them, the driving device includes a servo motor, a base, a driving gear and a limit shoe; the base can be detachably fixed outside the transmission line, and the servo motor and the limit shoe are respectively fixed on the base; the driving gear is driven to rotate by the servo motor; the driving gear and the limit shoe are arranged on both sides of the circular magnetic core; the circular magnetic core has a circular shell; a tooth track is arranged in the middle part of the circular shell along its circumferential direction; the driving gear is meshed with the tooth track; the inner arc surface of the limit shoe is the same as the arc of the outer circumferential surface of the circular shell, and is attached to the outer circumferential surface of the circular shell to support and limit the circular shell.

[0016] Among them, a limiting slideway arranged around the circular shell is also arranged on both sides of the tooth path on the outer circumferential surface of the circular shell; and a pulley is arranged on the inner arc surface of the limiting shoe corresponding to the limiting slideway.

[0017] Among them, the power of the power coil is predicted by combining the big data of the load changes of the high-voltage DC transmission line in one day. The prediction model is:

[0018] Current prediction model: ;

[0019] Magnetic field prediction model: ;

[0020] in, is the reference value of the current, i.e. the average value; is the amplitude of the current change; is the cycle, one day is 86400 seconds; is the current phase angle; is the proportionality coefficient between current and magnetic field, describing the effect of current change on magnetic field change; For time The current value at Represents the time variable, that is, the seconds of the current time; is the magnetic field strength at time t.

[0021] The power of the power taking coil at different times is predicted by the prediction model in the following method:

[0022] Calculate the current in the reverse coil: ; ;

[0023] Calculate the magnetic flux of the power coil ;

[0024] Calculate the induced electromotive force: ;

[0025] Calculating Power ;

[0026] in, is the time t and angle of the power coil The magnetic flux at ; is the current of the reverse coil at time t; is the induced electromotive force of the power coil at time t; is the power of the power taking coil at time t; is the turns ratio of the power taking coil and the reverse coil; is the capacitance of the parallel capacitor; is the voltage on the capacitor, is the voltage change across the parallel capacitor; is the rate of change of capacitor voltage, is the rate of change of parallel capacitor voltage over time, used to calculate current change; is the radius of the circular core; is the initial distance between the center point of the power taking coil and the center point of the transmission line, and is the initial distance between the power taking coil and the transmission line when not rotating; is the initial distance between the center point of the reverse coil and the center point of the transmission line, is the initial distance between the reverse coil and the transmission line when not rotating; is the eccentricity distance of the circular magnetic core, is the eccentricity distance of the circular magnetic core relative to the transmission line; is the rotation angle of the circular magnetic core, is the rotation angle of the circular magnetic core relative to the initial position; is the magnetic field strength at time t; The number of turns of the power coil is used to calculate the induced electromotive force; is the effective area of ​​the power coil, which is used to calculate the magnetic flux.

[0027] Among them, the control method for adjusting the rotation angle of the circular magnetic core in real time according to the predicted power change is:

[0028] Step 1: Set target power , that is, the optimal power consumption that the system is expected to maintain;

[0029] Step 2: Calculate the error between the predicted power and the target power ;in, For time The power error when is the target power; For the predicted time The power at

[0030] Step 3: Use PID controller to calculate the angle adjustment ;in, is the angle adjustment amount; are the proportional, integral and derivative gains of the PID controller;

[0031] Step 4: Calculate the new core rotation angle ;in, is the new core rotation angle; is the current core rotation angle; is the angle adjustment amount;

[0032] Step 5: New Angle Sent to the servo motor to adjust the rotation angle of the circular magnetic core.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. Power optimization

[0035] By dynamically adjusting the angle of the circular magnetic core, the present invention can adjust the magnetic flux ratio of the power taking coil and the reverse coil in real time. This adjustment enables the system to optimize the distribution of magnetic flux according to real-time current changes and changes in other electrical parameters, thereby maximizing the power taking. In daily operation, this means that it can be dynamically adjusted according to load demand and changes in power supply lines to ensure the most efficient energy conversion. Magnetic core saturation is caused by excessive magnetic flux exceeding the limit of the material's magnetic properties. After saturation, the magnetic core cannot effectively increase the magnetic flux, resulting in a decrease in the gain of its induced electromotive force, thereby affecting the power conversion efficiency of the entire system. By adjusting the rotation angle of the circular magnetic core in real time, the magnetic flux can be controlled to be distributed at the optimal level, thereby avoiding the core from reaching a saturated state and ensuring that the core always operates at the optimal operating point.

[0036] 2. Adjust in advance according to current and load changes

[0037] By integrating high-precision sensors and advanced predictive algorithms, the system can monitor current and load changes in real time and predict future changes. This allows the control system to react in advance and adjust the position and angle of the core to cope with upcoming changes. This predictive adjustment helps:

[0038] Improved response speed: The system can respond before the current and load actually change, which can adapt more quickly to sudden load changes, such as industrial peaks or power consumption troughs.

[0039] Prevent overload and saturation: By maintaining the magnetic flux at the optimal level and avoiding core saturation, the system is protected from efficiency loss and potential hardware damage caused by magnetic saturation, and the power consumption is dynamically maintained while the equipment is safe.

[0040] 3. Extend equipment life

[0041] Because it can reduce unnecessary overloads and stresses, and the power draw remains relatively stable, the dynamic adjustment mechanism helps reduce the failure of upstream and downstream related equipment, thereby extending the service life of related equipment. This is of great significance for reducing long-term maintenance costs and ensuring the return on equipment investment.

[0042] In general, the present invention realizes efficient and reliable high-voltage direct current transmission line power extraction through advanced control strategies and technologies, while enhancing the system's responsiveness to load changes and environmental adaptability. Through real-time regulation and predictive adjustment, the system can not only prevent core saturation, but also significantly improve the economy and stability of the system while ensuring efficient energy conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a radial cross-sectional schematic diagram of the power taking device of the present invention;

[0044] Figure 2 It is a schematic front view of the power taking device of the present invention.

[0045] In the figure, 1. circular magnetic core; 2. power taking coil; 3. reverse coil; 4. transmission line; 5. driving device; 51. servo motor; 52. base; 53. driving gear; 54. limit shoe; 6. circular shell; 61. tooth track; 62. limit slideway. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The present invention provides a technical solution:

[0048] See also Figure 1 and 2 A high-voltage direct current transmission line power-taking device that dynamically optimizes power taking includes an energy-taking device and a power-taking circuit, wherein the power-taking circuit includes a rectifier circuit, a filter circuit, a voltage-stabilizing circuit and a protection circuit; the power-taking coil of the energy-taking device is connected to the rectifier circuit; the rectifier circuit is connected to the filter circuit; the filter circuit is connected to the voltage-stabilizing circuit; the voltage-stabilizing circuit is connected to the protection circuit; the protection circuit outputs a direct current power supply; the energy-taking device includes a circular magnetic core 1, a power-taking coil 2 and a reverse coil 3; the reverse coil 3 is an open-circuit connection; the power-taking coil 2 and the reverse coil 3 are wound on both sides of the circular magnetic core 1, the inner diameter of the circular magnetic core 1 is larger than the outer diameter of the transmission line 4, and is eccentrically arranged relative to the axis of the transmission line 4, and a driving device 5 can drive the circular magnetic core 1 to rotate to adjust the magnetic flux ratio of the power-taking coil 2 and the reverse coil 3.

[0049] Among them, the driving device 5 includes a servo motor 51, a base 52, a driving gear 53 and a limiting shoe 54; the base 52 can be detachably fixed outside the power transmission line 4, and the servo motor 51 and the limiting shoe 54 are respectively fixed on the base 52; the driving gear 53 is driven to rotate by the servo motor 51; the driving gear 53 and the limiting shoe 54 are arranged on both sides of the circular magnetic core 1; the circular magnetic core 1 has a circular shell 6; a tooth track 61 is arranged in the middle part of the circular shell 6 along its circumferential direction; the driving gear 53 is meshed with the tooth track 61; the inner arc surface of the limiting shoe 54 has the same arc as the outer circumferential surface of the circular shell 6, and is attached to the outer circumferential surface of the circular shell 6 to support and limit the circular shell 6.

[0050] Among them, the outer circumferential surface of the circular shell 6 is further provided with limiting slideways 62 arranged around the circular shell 6 on both sides of the tooth track 61; the inner arc surface of the limiting shoe 54 is provided with a pulley corresponding to the limiting slideway 62.

[0051] Among them, the power of the power coil is predicted by combining the big data of the load changes of the high-voltage DC transmission line in one day. The prediction model is:

[0052] Current prediction model: ;

[0053] Magnetic field prediction model: ;

[0054] in, is the reference value of the current, i.e. the average value; is the amplitude of the current change; is the cycle, one day is 86400 seconds; is the current phase angle; is the proportionality coefficient between current and magnetic field, describing the effect of current change on magnetic field change; For time The current value at Represents the time variable, that is, the seconds of the current time; is the magnetic field strength at time t.

[0055] Among them, the power of the power taking coil at different times is predicted by the prediction model, and the method is:

[0056] Calculate the current in the reverse coil: ; ;

[0057] Calculate the magnetic flux of the power coil ;

[0058] Calculate the induced electromotive force: ;

[0059] Calculating Power ;

[0060] in, is the time t and angle of the power coil The magnetic flux at ; is the current of the reverse coil at time t; is the induced electromotive force of the power coil at time t; is the power of the power taking coil at time t; is the turns ratio of the power taking coil and the reverse coil; is the capacitance of the parallel capacitor; is the voltage on the capacitor, is the voltage change across the parallel capacitor; is the rate of change of capacitor voltage, is the rate of change of parallel capacitor voltage over time, used to calculate current change; is the radius of the circular core; is the initial distance between the center point of the power taking coil and the center point of the transmission line, and is the initial distance between the power taking coil and the transmission line when not rotating; is the initial distance between the center point of the reverse coil and the center point of the transmission line, is the initial distance between the reverse coil and the transmission line when not rotating; is the eccentricity distance of the circular magnetic core, is the eccentricity distance of the circular magnetic core relative to the transmission line; is the rotation angle of the circular magnetic core, is the rotation angle of the circular magnetic core relative to the initial position; is the magnetic field strength at time t; The number of turns of the power coil is used to calculate the induced electromotive force; is the effective area of ​​the power coil, which is used to calculate the magnetic flux.

[0061] Among them, the control method for adjusting the rotation angle of the circular magnetic core in real time according to the predicted power change is:

[0062] Step 1: Set target power , that is, the optimal power consumption that the system is expected to maintain;

[0063] Step 2: Calculate the error between the predicted power and the target power ;in, For time The power error when is the target power; For the predicted time The power at

[0064] Step 3: Use PID controller to calculate the angle adjustment ;in, is the angle adjustment amount; are the proportional, integral and derivative gains of the PID controller;

[0065] Step 4: Calculate the new core rotation angle ;in, is the new core rotation angle; is the current core rotation angle; is the angle adjustment amount;

[0066] Step 5: New Angle Sent to the servo motor to adjust the rotation angle of the circular magnetic core.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage direct current transmission line power supply device for dynamically optimizing power supply, comprising an energy supply device and a power supply circuit, wherein the power supply circuit comprises a rectifier circuit, a filter circuit, a voltage stabilizing circuit and a protection circuit; the power supply coil of the energy supply device is connected to the rectifier circuit; the rectifier circuit is connected to the filter circuit; the filter circuit is connected to the voltage stabilizing circuit; the voltage stabilizing circuit is connected to the protection circuit; the protection circuit outputs a direct current power supply; the energy supply device comprises a circular magnetic core (1), a power supply coil (2) and a reverse coil (3); the reverse coil (3) is an open circuit connection; the power supply coil (2) and the reverse coil (3) are wound on both sides of the circular magnetic core (1), characterized in that: The inner diameter of the circular magnetic core (1) is larger than the outer diameter of the transmission line (4), and is eccentrically arranged relative to the axis of the transmission line (4). A driving device (5) can drive the circular magnetic core (1) to rotate to adjust the magnetic flux ratio of the power taking coil (2) and the reverse coil (3). The power taking at different times is predicted by the prediction model, and the method is as follows: Calculate the current in the reverse coil: ; ; Calculate the magnetic flux of the power coil ; Calculate the induced electromotive force: ; Calculating Power ; in, is the time t and angle of the power coil The magnetic flux at ; is the current of the reverse coil at time t; n is the turns ratio of the power coil and the reverse coil; The turns ratio of the power taking coil and the reverse coil; The capacitance of the parallel capacitor; The voltage on the capacitor is the voltage change across the parallel capacitor; The rate of change of capacitor voltage is the rate of change of the parallel capacitor voltage over time and is used to calculate the current change; The radius of the circular core; is the initial distance between the center point of the power taking coil and the center point of the transmission line, and is the initial distance between the power taking coil and the transmission line when not rotating; is the initial distance between the center point of the reverse coil and the center point of the transmission line, is the initial distance between the reverse coil and the transmission line when not rotating; The eccentricity of the circular magnetic core is the eccentricity of the circular magnetic core relative to the transmission line; The rotation angle of the circular magnetic core is the rotation angle of the circular magnetic core relative to the initial position; is the magnetic field strength over time changes; The number of turns of the electric coil is used to calculate the induced electromotive force; The effective area of ​​the power coil is used to calculate the magnetic flux.

2. A high voltage direct current transmission line power taking device for dynamically optimizing power taking as claimed in claim 1, characterized in that: The driving device (5) comprises a servo motor (51), a base (52), a driving gear (53) and a limiting shoe (54); the base (52) is detachably fixed outside the power transmission line (4), and the servo motor (51) and the limiting shoe (54) are respectively fixed on the base (52); the driving gear (53) is driven to rotate by the servo motor (51); the driving gear (53) and the limiting shoe (54) are arranged on both sides of the circular magnetic core (1); the circular magnetic core (1) has a circular shell (6); a tooth track (61) is arranged in the middle of the circular shell (6) along its circumferential direction; the driving gear (53) meshes with the tooth track (61); the inner arc surface of the limiting shoe (54) has the same arc as the outer circumferential surface of the circular shell (6), and is attached to the outer circumferential surface of the circular shell (6) to support and limit the circular shell (6).

3. A high voltage direct current transmission line power taking device for dynamically optimizing power taking as claimed in claim 2, characterized in that: The outer circumferential surface of the circular outer shell (6) is provided with limiting slideways (62) arranged around the circular outer shell (6) on both sides of the tooth path (61); and a pulley is provided on the inner arc surface of the limiting shoe (54) corresponding to the limiting slideway (62).

4. A high voltage direct current transmission line power taking device for dynamically optimizing power taking as claimed in claim 1, characterized in that: Combined with the big data of the load changes of the high-voltage DC transmission line in one day, the power of the power coil is predicted. The prediction model is: Current prediction model: ; Magnetic field prediction model: ; in, The baseline value of the current, i.e. the average value; The amplitude of the current change; is the cycle, one day is 86400 seconds; is the current phase angle; The proportionality coefficient between current and magnetic field describes the effect of current change on magnetic field change; For time The current value at Represents a time variable, that is, the number of seconds of the current time.

5. A high voltage direct current transmission line power taking device for dynamically optimizing power taking as claimed in claim 1, characterized in that: The control method for adjusting the rotation angle of the circular magnetic core in real time according to the predicted power change is: Step 1: Set target power , that is, the optimal power consumption that the system is expected to maintain; Step 2: Calculate the error between the predicted power and the target power ;in, For time The power error when Target power; For the predicted time The power at Step 3: Use PID controller to calculate the angle adjustment ;in, is the angle adjustment amount; are the proportional, integral and derivative gains of the PID controller; Step 4: Calculate the new core rotation angle ;in, is the new core rotation angle; is the current core rotation angle; is the angle adjustment amount; Step 5: Rotate the new core Sent to the servo motor to adjust the rotation angle of the circular magnetic core.

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