Energy taking system for distribution network cable and energy taking method for distribution network cable

Abstract

The embodiment of the invention provides an energy taking system for a distribution network cable and an energy taking method for the distribution network cable, relates to the technical field of power grid energy taking, and can improve the safety, stability and reliability of taking energy from the distribution network cable and improve the energy taking quality. The system comprises an energy taking module which is used for accessing a distribution network cable so as to obtain alternating current on the distribution network cable; the input end of the rectification module is electrically connected with the output end of the energy taking module, and the rectification module is used for converting alternating current into first direct current; the input end of the voltage regulating module is electrically connected with the output end of the rectifying module, the voltage regulating module is used for regulating the voltage of the first direct current to target voltage and inputting the first direct current with the voltage being the target voltage to an external load, and the target voltage is the voltage required by the operation of the external load; and the detection module is connected between the output end of the voltage regulation module and an external load, and the detection module is used for detecting the actual voltage of the first direct current output by the voltage regulation module.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of cable energy extraction, and in particular, to an energy extraction system for distribution network cables and an energy extraction method for distribution network cables. Background Art

[0002] With the acceleration of urbanization and the continuous development of society, both industrial production and life security require electricity to maintain. In the current power system, electric energy is usually transmitted through high-voltage distribution cables, and the high-voltage AC power on the high-voltage distribution cables is extracted and transmitted to the required external power loads through the energy extraction system for the distribution cables.

[0003] However, since high-voltage distribution cables usually carry high-voltage alternating current, while the power required by external power loads is usually low-voltage direct current, the safety of power conversion is particularly important during the energy extraction process of distribution cables. Therefore, proposing an energy extraction system for distribution cables that can improve the safety, stability and reliability of energy extraction has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiments of the present application provide an energy acquisition system for a distribution network cable and an energy acquisition method for a distribution network cable, which can improve the safety, stability and reliability of energy acquisition from the distribution network cable and improve the energy acquisition quality for the distribution network cable.

[0005] According to a first aspect of an embodiment of the present application, there is provided an energy acquisition system for a distribution network cable, comprising:

[0006] An energy acquisition module, used for accessing a distribution network cable to obtain AC power on the distribution network cable;

[0007] A rectifier module, the input end of the rectifier module is electrically connected to the output end of the energy acquisition module, and the rectifier module is used to convert the alternating current into a first direct current;

[0008] a voltage regulating module, wherein an input end of the voltage regulating module is electrically connected to an output end of the rectifier module, and the voltage regulating module is used to regulate the voltage of the first direct current to a target voltage, and input the first direct current with the target voltage to an external load, wherein the target voltage is a voltage required for the operation of the external load;

[0009] A detection module is connected between the output end of the voltage regulating module and the external load, and is used to detect the actual voltage of the first direct current output by the voltage regulating module.

[0010] In some embodiments, the energy acquisition system for a distribution network cable further includes:

[0011] A power supply module is used to input a second direct current with a voltage of the target voltage to an external load.

[0012] In some embodiments, the detection module is connected between the output end of the power module and the external load, and the detection module is used to detect the actual voltage of the second direct current output by the power module. The detection module is used to detect the actual voltage of the second direct current output by the power module.

[0013] In some embodiments, the energy acquisition system for a distribution network cable further includes:

[0014] A control module, wherein the input end of the control module is electrically connected to the output end of the detection module, the output end of the control module is electrically connected to the input end of the voltage regulating module and the input end of the power module, and the control module is used to control whether the voltage regulating module and the power module are electrically connected to the external load according to the actual voltage of the first direct current output by the voltage regulating module and the actual voltage of the second direct current output by the power module.

[0015] In some embodiments, the energy acquisition system for a distribution network cable further includes:

[0016] An alarm module, wherein the input end of the alarm module is electrically connected to the output end of the detection module, and the alarm module is used to issue an alarm message when the difference between the actual voltage of the first direct current and the target voltage is greater than a preset threshold.

[0017] In some embodiments, the rectifier module includes:

[0018] A conversion module, the conversion module is used to convert the alternating current into a first direct current;

[0019] A filter module, wherein an input end of the filter module is electrically connected to an output end of the conversion module, and the filter module is used to filter the first direct current output by the conversion module.

[0020] In some embodiments, the energy acquisition system for a distribution network cable further includes:

[0021] A circuit protection module, wherein the input end of the circuit protection module is used to access the distribution network cable, the output end of the circuit protection module is electrically connected to the input end of the energy acquisition module, and the circuit protection module is used to reduce the voltage of the alternating current on the distribution network cable.

[0022] In some embodiments, the circuit protection module includes a protection circuit, which includes a first capacitor, a second capacitor, a first resistor, a second resistor and an inductor. The first capacitor is connected in series with the first resistor to form a first sub-loop, the second capacitor, the second resistor and the inductor are connected in series to form a second sub-loop, the first sub-loop is connected in parallel with the second sub-loop, one end of the protection circuit is used to connect to the distribution network cable, and the other end of the protection circuit is used for grounding.

[0023] In some embodiments, the circuit protection module includes a unidirectional conduction unit.

[0024] According to a second aspect of an embodiment of the present application, there is provided a method for obtaining energy from a distribution network cable, comprising:

[0025] Accessing a distribution network cable to obtain alternating current on the distribution network cable;

[0026] converting the alternating current into a first direct current;

[0027] adjusting the voltage of the first direct current to a target voltage, and inputting the first direct current having the target voltage to an external load, wherein the target voltage is a voltage required for the external load to operate;

[0028] The actual voltage of the first direct current is detected.

[0029] The embodiments of the present application provide an energy acquisition system for a distribution network cable and an energy acquisition method for a distribution network cable. The distribution network cable is connected through an energy acquisition module to obtain alternating current on the distribution network cable, and the alternating current is converted into a first direct current through a rectifier module to provide direct current to an external load. The voltage of the first direct current is further adjusted to a target voltage through a voltage regulation module so that the external load can directly use it, thereby avoiding excessive or insufficient current on the external load, which affects the normal operation of the external load. At the same time, the first direct current after voltage regulation by the voltage regulation module is detected through a detection module, thereby further improving the accuracy of energy acquisition for the distribution network cable, thereby improving the safety, stability and reliability of energy acquisition from the distribution network cable, and improving the energy acquisition quality for the distribution network cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] FIG1 is a schematic structural diagram of an energy extraction system for a distribution network cable provided in an embodiment of the present application;

[0032] FIG2 is a schematic circuit diagram of a protection circuit for an energy extraction system of a distribution network cable provided in an embodiment of the present application;

[0033] FIG3 is a schematic flowchart of a method for obtaining energy from a distribution network cable provided in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100, energy acquisition module; 200, rectification module; 201, conversion module; 202, filtering module; 300, voltage regulation module; 400, detection module; 500, power supply module; 600, control module; 700, alarm module; 800, circuit protection module. DETAILED DESCRIPTION

[0036] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, in this specification, the term "and / or" includes any and all combinations of the relevant listed items.

[0039] With the acceleration of urbanization and the continuous development of society, both industrial production and life security require electricity to maintain. In the current power system, electric energy is usually transmitted through high-voltage distribution cables, and the high-voltage AC power on the high-voltage distribution cables is extracted and transmitted to the required external power loads through the energy extraction system for the distribution cables.

[0040] However, since high-voltage distribution cables usually carry high-voltage alternating current, while the power required by external power loads is usually low-voltage direct current, the safety of power conversion is particularly important during the energy extraction process of distribution cables. Therefore, proposing an energy extraction system for distribution cables that can improve the safety, stability and reliability of energy extraction has become a technical problem that needs to be solved urgently.

[0041] FIG1 is a schematic structural diagram of an energy extraction system for a distribution network cable provided in an embodiment of the present application. As shown in FIG1 , in the first aspect of an embodiment of the present application, an energy extraction system for a distribution network cable is provided, comprising: an energy extraction module 100, a rectifier module 200, a voltage regulator module 300 and a detection module 400. Among them, the energy extraction module 100 is used to access the distribution network cable to obtain the alternating current on the distribution network cable; the input end of the rectifier module 200 is electrically connected to the output end of the energy extraction module 100, and the rectifier module 200 is used to convert the alternating current into a first direct current; the input end of the voltage regulator module 300 is electrically connected to the output end of the rectifier module 200, and the voltage regulator module 300 is used to adjust the voltage of the first direct current to a target voltage, and input the first direct current with a voltage of the target voltage to an external load, and the target voltage is the voltage required for the operation of the external load; the detection module 400 is connected between the output end of the voltage regulator module 300 and the external load, and the detection module 400 is used to detect the actual voltage of the first direct current output by the voltage regulator module 300.

[0042] Exemplarily, the energy acquisition module 100 may include a first coil and a second coil, wherein the first coil is electrically connected to the distribution network cable by being sleeved on the distribution network cable, and the second coil is electrically connected to the input end of the rectifier module.

[0043] The energy acquisition system for a distribution cable provided in the embodiment of the present application is connected to the distribution cable through the energy acquisition module 100 to obtain the alternating current on the distribution cable, and the alternating current is converted into a first direct current through the rectifier module 200 to provide direct current to an external load, and the voltage of the first direct current is further adjusted to a target voltage through the voltage regulation module 300 so that the external load can directly use it, thereby avoiding excessive or insufficient current on the external load, which affects the normal operation of the external load. At the same time, the first direct current after the voltage regulation processing by the voltage regulation module 300 is detected through the detection module 400, thereby further improving the accuracy of energy acquisition for the distribution cable, and then improving the safety, stability and reliability of energy acquisition from the distribution cable, and improving the energy acquisition quality for the distribution cable.

[0044] As shown in FIG. 1 , in some feasible implementations, the energy acquisition system for a distribution network cable further includes: a power module 500, and the power module 500 is used to input a second direct current with a target voltage to an external load.

[0045] Exemplarily, the energy extraction system for distribution network cables provided in the embodiment of the present application further includes a power charging module, the output end of the power charging module is electrically connected to the input end of the power module 500, and the power charging module is used to charge the power module 500. The power module 500 may include a battery, such as a lithium battery.

[0046] The energy acquisition system for the distribution network cable provided in the embodiment of the present application uses the power module 500 as a backup power source for the external load, and is used to back up the power supply of the distribution network cable to the external load, so as to provide power to the external load in the event of abnormal energy acquisition for the distribution network cable or abnormal power supply of the distribution network cable, so as to maintain stable operation of the external load, thereby further improving the stability and reliability of energy acquisition for the distribution network cable, improving the energy acquisition quality for the distribution network cable, and improving the power supply quality of the energy acquisition system for the distribution network cable.

[0047] As shown in Figure 1, in some feasible implementations, the detection module 400 is connected between the output end of the power module 500 and the external load, and the detection module 400 is used to detect the actual voltage of the second direct current output by the power module 500. The detection module 400 is used to detect the actual voltage of the second direct current output by the power module 500.

[0048] The energy acquisition system for distribution network cables provided in the embodiment of the present application can detect the actual voltage of the second direct current output by the power module 500 through the detection module 400 before the step of supplying power to the external load through the power module 500, thereby improving the accuracy of the voltage of the energy acquisition system for distribution network cables for redundant power supply to external loads, further improving the stability and reliability of energy acquisition for distribution network cables, improving the energy acquisition quality for distribution network cables, and improving the power supply quality of the energy acquisition system for distribution network cables.

[0049] As shown in Figure 1, in some feasible implementations, the energy acquisition system for the distribution network cable also includes: a control module 600, the input end of the control module 600 is electrically connected to the output end of the detection module 400, the output end of the control module 600 is electrically connected to the input end of the voltage regulating module 300 and the input end of the power module 500, and the control module 600 is used to control whether the voltage regulating module 300 and the power module 500 are electrically connected to an external load according to the actual voltage of the first direct current output by the voltage regulating module 300 and the actual voltage of the second direct current output by the power module 500.

[0050] Exemplarily, when the actual voltage of the first direct current output by the voltage regulating module 300 is equal to the target voltage, the voltage regulating module 300 is controlled by the control module 600 to be electrically connected to the external load to supply power to the external load. When the actual voltage of the first direct current output by the voltage regulating module 300 is greater than or less than the target voltage, the control module 600 controls the detection module 400 to detect the actual voltage of the second direct current output by the power module 500, and when the actual voltage of the second direct current output by the power module 500 is equal to the target voltage, the control module 600 controls the power module 500 to be electrically connected to the external load to supply power to the external load.

[0051] The energy acquisition system for distribution network cables provided in the embodiment of the present application controls the on-off electrical connection between the voltage regulating module 300 and the external load, and the on-off electrical connection between the power module 500 and the external load according to the actual voltage of the first direct current output by the voltage regulating module 300 and the actual voltage of the second direct current output by the power module 500 through the control module 600. In the event of power supply failure of the distribution network cable or abnormal voltage regulation function of the voltage regulating module 300, the power module 500 with a more stable and accurate output voltage can be used as a backup power supply to power the external load, which can further improve the stability and reliability of energy acquisition for distribution network cables, improve the energy acquisition quality for distribution network cables, and improve the power supply quality of the energy acquisition system for distribution network cables.

[0052] As shown in Figure 1, in some feasible implementations, the energy acquisition system for the distribution network cable also includes: an alarm module 700, the input end of the alarm module 700 is electrically connected to the output end of the detection module 400, and the alarm module 700 is used to issue an alarm message when the difference between the actual voltage of the first direct current and the target voltage is greater than a preset threshold.

[0053] Exemplarily, the alarm information may include sound and light information, and the alarm module 700 may be used to connect to the Internet and send the alarm information to the management personnel according to the relationship between the difference between the actual voltage of the first direct current and the target voltage and the preset threshold.

[0054] Exemplarily, the alarm information may include the actual voltage of the first DC power output by the voltage regulating module 300, the actual voltage of the first DC power output by the power module 500, and the time when the actual voltage of the first DC power differs from the target voltage.

[0055] The energy acquisition system for distribution network cables provided in the embodiment of the present application, by setting an alarm module 700, sends out an alarm message when the difference between the actual voltage of the first direct current and the target voltage is greater than a preset threshold value, which can facilitate management personnel to monitor the operating status of the voltage regulating module 300 and the power module 500 in real time, and facilitate fault location of the energy acquisition system for distribution network cables, so that when a fault occurs in the energy acquisition system for distribution network cables, the fault can be solved in time, which can further improve the safety, stability and reliability of energy acquisition for distribution network cables, improve the energy acquisition quality for distribution network cables, and improve the power supply quality of the energy acquisition system for distribution network cables.

[0056] As shown in FIG1 , in some feasible implementations, the rectifier module 200 includes: a conversion module 201 and a filter module 202. The conversion module 201 is used to convert the alternating current into the first direct current; the input end of the filter module 202 is electrically connected to the output end of the conversion module 201, and the filter module 202 is used to filter the first direct current output by the conversion module 201.

[0057] Exemplarily, the conversion module 201 may include an AC-DC converter, and the input end of the conversion module 201 is electrically connected to the distribution network cable to obtain the AC power on the distribution network cable, and the AC power on the distribution network cable can be converted into DC power by the conversion module 201. The filtering module 202 can be used to filter the DC power output by the conversion module 201 to improve the stability of the first DC power.

[0058] Exemplarily, the filtering module 202 may include a filtering capacitor, a filter, a filtering loop, and the like.

[0059] The energy acquisition system for distribution network cables provided in the embodiment of the present application converts alternating current into direct current through the conversion module 201, which can facilitate the supply of direct current to external loads and facilitate the use of external loads. The direct current output by the conversion module 201 is further filtered through the filtering module 202, and stray electrical signals other than the target voltage can be filtered out, thereby further improving the stability and accuracy of the first direct current, improving the stability and reliability of the operation of the external load, and extending the service life of the external load, thereby further improving the safety, stability and reliability of energy acquisition for distribution network cables, improving the energy acquisition quality for distribution network cables, and improving the power supply quality of the energy acquisition system for distribution network cables.

[0060] As shown in Figure 1, in some feasible implementations, the energy extraction system for the distribution network cable also includes: a circuit protection module 800, the input end of the circuit protection module 800 is used to access the distribution network cable, the output end of the circuit protection module 800 is electrically connected to the input end of the energy extraction module 100, and the circuit protection module 800 is used to reduce the voltage of the alternating current on the distribution network cable.

[0061] Exemplarily, the circuit protection module 800 can be used to be connected in series with the energy extraction cable in the energy extraction module 100 to reduce the voltage of the distribution network cable, thereby protecting the safety of the energy extraction module 100. The circuit protection module 800 can also be used to prevent the electronic components in the energy extraction module 100 from breaking down when the voltage suddenly changes, thereby further improving the safety of the energy extraction module 100.

[0062] The energy acquisition system for distribution cables provided in the embodiment of the present application can protect the energy acquisition module 100 during the energy acquisition process for the distribution cables through the circuit protection module 800, thereby preventing the high-voltage alternating current on the high-voltage distribution cables from breaking down the electronic components in the energy acquisition system for the distribution cables, thereby improving the safety, stability and reliability of the energy acquisition module 100, and further improving the safety, stability and reliability of the energy acquisition system for the distribution cables during the energy acquisition process, improving the energy acquisition quality for the distribution cables, and improving the power supply quality of the energy acquisition system for the distribution cables.

[0063] FIG2 is a schematic circuit diagram of a protection circuit for an energy extraction system of a distribution network cable provided in an embodiment of the present application. As shown in FIG2, in some feasible implementations, the circuit protection module 800 includes a protection circuit, the protection circuit includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2 and an inductor L, the first capacitor C1 is connected in series with the first resistor R1 to form a first sub-loop, the second capacitor C2, the second resistor R2 and the inductor L are connected in series to form a second sub-loop, the first sub-loop is connected in parallel with the second sub-loop, one end of the protection circuit is used to access the distribution network cable, and the other end of the protection circuit is used for grounding.

[0064] The energy collection system for distribution network cables provided in the embodiment of the present application reduces the voltage of the high voltage AC power on the distribution network cable before the high voltage AC power enters the energy collection module 100 through the protection circuit, thereby preventing the high voltage power from entering the energy collection module 100 and causing damage to the energy collection module 100, thereby improving the safety, stability and reliability of the energy collection module 100, and further extending the service life of the energy collection module 100, thereby improving the safety, stability and reliability of the energy collection system for distribution network cables during the energy collection process, improving the energy collection quality for the distribution network cables, and improving the power supply quality of the energy collection system for the distribution network cables.

[0065] In some feasible implementations, the circuit protection module 800 includes a unidirectional conduction unit.

[0066] Exemplarily, the unidirectional conducting unit may include a diode, such as a transient voltage suppressor diode.

[0067] The energy acquisition system for distribution network cables provided in the embodiment of the present application can prevent the distribution network cables from malfunctioning during the transmission of electric energy through the unidirectional conduction unit in the circuit protection module 800, thereby reducing the impact of the voltage mutation on the energy acquisition module 100 when the voltage on the distribution network cable suddenly changes, thereby improving the safety, stability and reliability of the energy acquisition module 100, and further extending the service life of the energy acquisition module 100, thereby improving the safety, stability and reliability of the energy acquisition system for distribution network cables during the energy acquisition process, improving the energy acquisition quality for distribution network cables, and improving the power supply quality of the energy acquisition system for distribution network cables.

[0068] Exemplarily, the energy extraction system for the distribution network cable may further include a lightning arrester, wherein one end of the lightning arrester is electrically connected to the high-voltage electrode of the high-voltage distribution network cable, and the other end of the lightning arrester passes through the through hole of the lower electrode of the high-voltage distribution network cable for grounding. The lightning arrester may include a zinc oxide lightning arrester.

[0069] Exemplarily, the energy-taking system for distribution network cables may further include a housing, at least the energy-taking module 100, the rectifier module 200, the voltage-regulating module 300 and the detection module 400 are arranged inside the shell of the housing, for achieving the insulation effect between the modules and the external environment, thereby avoiding leakage of the energy-taking system for distribution network cables, or contact injuries to related personnel, and improving the safety of the energy-taking system for distribution network cables. The housing may adopt a pillar-type design of a glass fiber epoxy barrel.

[0070] Exemplarily, the outer surface of the shell may be provided with a silicone shed, which is used to improve the insulation performance of the outer shell of the shell. A dust cover may be provided above the silicone shed, which is in the shape of an umbrella, and the radius of the silicone shed may be smaller than the radius of the dust cover, so that the dust cover may prevent dust accumulation or ice from forming on the surface of the silicone shed. The connection between the dust cover and the silicone shed may be designed to be detachable, so that the dust cover may be easily cleaned and replaced. In the case where the shell adopts a pillar-type design of a glass fiber epoxy barrel, the pillar insulator may be replaced by the structure of the silicone shed.

[0071] FIG3 is a schematic flow chart of a method for obtaining energy from a distribution network cable provided in an embodiment of the present application. As shown in FIG3, a second aspect of an embodiment of the present application provides a method for obtaining energy from a distribution network cable, comprising:

[0072] Step S110: Connecting to the distribution network cable to obtain AC power on the distribution network cable.

[0073] Step S120: convert the alternating current into a first direct current.

[0074] Step S130: adjust the voltage of the first direct current to a target voltage, and input the first direct current with the target voltage to an external load, where the target voltage is a voltage required for the external load to operate.

[0075] Step S140: Detect the actual voltage of the first direct current.

[0076] The energy acquisition method for a distribution network cable provided in an embodiment of the present application obtains alternating current on the distribution network cable by accessing the distribution network cable, and converts the alternating current into a first direct current so as to provide direct current to an external load, and further adjusts the voltage of the first direct current to a target voltage so that the external load can directly use it, thereby avoiding excessive or insufficient current on the external load, which affects the normal operation of the external load. At the same time, the accuracy of energy acquisition for the distribution network cable can be further improved by detecting the first direct current after the voltage regulation process, thereby improving the safety, stability and reliability of energy acquisition from the distribution network cable, and improving the energy acquisition quality for the distribution network cable.

[0077] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0078] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features of the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An energy extraction system for distribution network cables, characterized in that: include: An energy acquisition module, used for accessing a distribution network cable to obtain AC power on the distribution network cable; A rectifier module, the input end of the rectifier module is electrically connected to the output end of the energy acquisition module, and the rectifier module is used to convert the alternating current into a first direct current; a voltage regulating module, wherein an input end of the voltage regulating module is electrically connected to an output end of the rectifier module, and the voltage regulating module is used to regulate the voltage of the first direct current to a target voltage, and input the first direct current with the target voltage to an external load, wherein the target voltage is a voltage required for the operation of the external load; A detection module is connected between the output end of the voltage regulating module and the external load, and is used to detect the actual voltage of the first direct current output by the voltage regulating module.

2. The energy extraction system for distribution network cables according to claim 1, characterized in that: Also includes: A power supply module is used to input a second direct current with a voltage of the target voltage to an external load.

3. The energy extraction system for distribution network cables according to claim 2, characterized in that: The detection module is connected between the output end of the power module and the external load, and is used to detect the actual voltage of the second direct current output by the power module. The detection module is used to detect the actual voltage of the second direct current output by the power module.

4. The energy extraction system for distribution network cables according to claim 3, characterized in that: Also includes: A control module, wherein the input end of the control module is electrically connected to the output end of the detection module, the output end of the control module is electrically connected to the input end of the voltage regulating module and the input end of the power module, and the control module is used to control whether the voltage regulating module and the power module are electrically connected to the external load according to the actual voltage of the first direct current output by the voltage regulating module and the actual voltage of the second direct current output by the power module.

5. The energy extraction system for distribution network cables according to claim 1, characterized in that: Also includes: An alarm module, wherein the input end of the alarm module is electrically connected to the output end of the detection module, and the alarm module is used to issue an alarm message when the difference between the actual voltage of the first direct current and the target voltage is greater than a preset threshold.

6. The energy extraction system for distribution network cables according to claim 1, characterized in that: The rectifier module comprises: A conversion module, the conversion module is used to convert the alternating current into a first direct current; A filter module, wherein an input end of the filter module is electrically connected to an output end of the conversion module, and the filter module is used to filter the first direct current output by the conversion module.

7. The energy extraction system for distribution network cables according to claim 1, characterized in that: Also includes: A circuit protection module, wherein the input end of the circuit protection module is used to access the distribution network cable, the output end of the circuit protection module is electrically connected to the input end of the energy acquisition module, and the circuit protection module is used to reduce the voltage of the alternating current on the distribution network cable.

8. The energy extraction system for distribution network cables according to claim 7, characterized in that: The circuit protection module includes a protection circuit, which includes a first capacitor, a second capacitor, a first resistor, a second resistor and an inductor. The first capacitor is connected in series with the first resistor to form a first sub-loop, the second capacitor, the second resistor and the inductor are connected in series to form a second sub-loop, the first sub-loop is connected in parallel with the second sub-loop, one end of the protection circuit is used to connect to the distribution network cable, and the other end of the protection circuit is used for grounding.

9. The energy extraction system for distribution network cables according to claim 7, characterized in that: The circuit protection module includes a unidirectional conduction unit.

10. A method for obtaining energy from a distribution network cable, characterized in that: include: Accessing a distribution network cable to obtain alternating current on the distribution network cable; converting the alternating current into a first direct current; adjusting the voltage of the first direct current to a target voltage, and inputting the first direct current having the target voltage to an external load, wherein the target voltage is a voltage required for the external load to operate; The actual voltage of the first direct current is detected.

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