Grounding control method, device and equipment of power distribution network and storage medium

Abstract

The embodiment of the invention provides a grounding control method and device for a power distribution network, equipment and a storage medium, and relates to the technical field of power systems. The grounding control method comprises the following steps: acquiring current on a live wire; when the current is greater than or equal to the first preset current, judging that the power distribution network leaks electricity; and the grounding control unit applies potential which is equal to the leakage potential in amplitude and opposite to the leakage potential in phase to the zero line. According to the grounding control method, device and equipment of the power distribution network and the storage medium provided by the embodiment of the invention, when an electric leakage fault is detected, the potential which is equal to the electric leakage potential in amplitude and opposite to the electric leakage potential in phase can be applied between the null line and the ground wire, so that the voltage to ground of the null line is quickly clamped to zero, and residual current of the electric leakage fault is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a grounding control method, device, equipment and storage medium for a distribution network. Background Art

[0002] As modern society's dependence on electricity supply continues to increase, the safe and stable operation of the distribution network, as a core component of the power system, is extremely important for protecting the interests of power users and maintaining normal production and living order. In recent years, with the increase in cable line users, especially the expansion of the power supply network, the single-phase grounding capacitive current in the power supply system has increased significantly. This situation has led to frequent equipment damage accidents caused by single-phase intermittent grounding.

[0003] The existing neutral point grounding method of the distribution network is mainly the neutral point grounding method through the arc suppression coil. In recent years, the requirements for the stability of the distribution network have been continuously improved, and the method of using the arc suppression coil to compensate the capacitor current has the defects of low signal-to-noise ratio and obvious fluctuation of the waveform of the compensation current. Summary of the invention

[0004] The embodiments of the present invention provide a grounding control method, device, equipment and storage medium for a distribution network. The method can apply a potential with the same amplitude and opposite phase to the leakage potential between the neutral line and the ground line when a leakage fault occurs in the distribution network, quickly clamp the neutral line to ground voltage to zero, and eliminate the residual current of the leakage fault.

[0005] According to one aspect of the present invention, an embodiment of the present invention provides a grounding control method for a distribution network, wherein the distribution network includes a live wire, a neutral wire and a ground wire, a load is arranged between the live wire and the neutral wire, a grounding control unit is arranged between the neutral wire and the ground wire, and one end of the grounding control unit is connected to the live wire; the grounding control method includes:

[0006] Get the current on the live wire;

[0007] When the current is greater than or equal to the first preset current, it is determined that leakage occurs in the distribution network;

[0008] The grounding control unit applies a potential to the neutral line that is equal in magnitude and opposite in phase to the leakage potential.

[0009] Optionally, after obtaining the current on the live wire, the following is further included:

[0010] When the current is less than the first preset current, it is determined that the power supply of the distribution network is normal;

[0011] The grounding control unit controls the neutral line to be directly grounded.

[0012] Optionally, after the grounding control unit applies a potential having an amplitude equal to the leakage potential and an opposite phase to the neutral line, the method further includes:

[0013] Output the alarm information of power distribution network leakage.

[0014] Optionally, after the grounding control unit applies a potential having an amplitude equal to the leakage potential and an opposite phase to the neutral line, the method further includes:

[0015] The current on the live wire is continuously obtained, and when the current is less than a first preset current, the grounding control unit controls the neutral wire to be directly grounded.

[0016] Optionally, the grounding control unit includes a first switch, a second switch, a third switch and a voltage regulating transformer, the first end of the first switch is connected to the neutral line, the second end of the first switch is connected to the ground line, the first end of the second switch is connected to the neutral line, the second end of the second switch is connected to the first output end of the voltage regulating transformer, the second output end of the voltage regulating transformer is connected to the ground line, the first input end of the voltage regulating transformer is connected to the neutral line, the second input end of the voltage regulating transformer is connected to the second end of the third switch, and the first end of the third switch is connected to the live line;

[0017] When the grounding control unit controls the neutral line to be directly grounded, the first switch is closed, and the second switch and the third switch are opened;

[0018] When the grounding control unit controls to apply a potential with the same amplitude and opposite phase as the leakage potential to the neutral line, the first switch is opened, and the second switch and the third switch are closed.

[0019] Optionally, the distribution network is a three-phase power distribution network, and the third switch includes a first sub-switch, a second sub-switch and a third sub-switch;

[0020] When it is determined that at least one live wire has leakage, the grounding control unit controls the corresponding sub-switch to close.

[0021] Optionally, the grounding control unit meets the following conditions when it is actuated:

[0022] The first switch and the third switch are prohibited from being closed at the same time;

[0023] Before the first switch is opened, the second switch is closed first;

[0024] When the leakage protection is exited, the third switch is opened first, then the first switch is closed, and finally the second switch is opened.

[0025] According to another aspect of the present invention, an embodiment of the present invention provides a grounding control device for a power distribution network, comprising:

[0026] A current acquisition module, used for acquiring the current on the live wire;

[0027] A leakage detection module, used to determine that leakage occurs in the distribution network when a current is detected to be greater than or equal to a first preset current;

[0028] The control module is used to control the grounding control unit to apply a potential equal to the leakage potential amplitude and opposite to the phase to the neutral line when the leakage detection module determines that leakage occurs in the distribution network.

[0029] According to another aspect of the present invention, an embodiment of the present invention provides a grounding control device for a power distribution network, including:

[0030] one or more processors;

[0031] A memory for storing one or more programs;

[0032] When one or more programs are executed by one or more processors, the one or more processors implement the grounding control method provided by any embodiment of the present invention.

[0033] According to another aspect of the present invention, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the grounding control method provided by any embodiment of the present invention is implemented.

[0034] The embodiments of the present invention provide a grounding control method, device, equipment and storage medium for a distribution network. When a leakage fault is detected, a potential with an amplitude equal to and a phase opposite to the leakage potential can be applied between the neutral line and the ground line by setting a grounding control unit, thereby quickly clamping the neutral line-to-ground voltage to zero and eliminating the residual current of the leakage fault; and the input side of the grounding control unit directly obtains the potential from the fault point of the distribution network, and the obtained compensation potential is stable relative to the leakage potential waveform and has a high signal-to-noise ratio.

[0035] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution in this embodiment, the drawings required for use in the description of the embodiment will be briefly introduced below. 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.

[0037] Figure 1 It is a structural schematic diagram of a grounding control device for a distribution network provided by an embodiment of the present invention;

[0038] Figure 2is a flow chart of a grounding control method for a distribution network provided by an embodiment of the present invention;

[0039] Figure 3 is a flow chart of another grounding control method for a distribution network provided by an embodiment of the present invention;

[0040] Figure 4 It is a structural block diagram of a grounding control device for a distribution network provided by an embodiment of the present invention;

[0041] Figure 5 It is a structural schematic diagram of a grounding control device for a distribution network provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] The embodiments of the present invention provide a grounding control method, device, equipment and storage medium for a distribution network. The method can apply a potential with the same amplitude and opposite phase to the leakage potential between the neutral line and the ground line when a leakage fault occurs in the distribution network, quickly clamp the neutral line to ground voltage to zero, and eliminate the residual current of the leakage fault.

[0045] An embodiment of the present invention provides a grounding control method for a distribution network. The distribution network includes a live wire, a neutral wire and a ground wire. A load is arranged between the live wire and the neutral wire. A grounding control unit is arranged between the neutral wire and the ground wire. One end of the grounding control unit is connected to the live wire.

[0046] Figure 1Schematic diagram of a grounding control device for a distribution network provided by an embodiment of the present invention. Figure 1 , take the distribution network including three-phase electricity as an example, the distribution network includes a three-phase transformer T1, the common three-phase transformer is a three-phase dry-type transformer, the three-phase dry-type transformer can withstand 150° high temperature and has F-class insulation grade, the insulation resistance is not less than 150MΩ, and the three-phase dry-type transformer is allowed to exceed 1.2 times the rated load. The phase lines of phase a, phase b and phase c of the three-phase transformer T1 are equivalent to the live wire of the distribution network, and the phase a, phase b and phase c of the three-phase transformer T1 are connected to the load R a , Z a , R b , Z b , R c and Z c The grounding control unit 100 includes a first switch K1, a second switch K2, and a third switch K3 (including a first sub-switch K a , the second sub switch K b 、The third sub switch K c) The neutral point of the three-phase transformer T1 is connected to the protective ground line PE through the first switch K1, and the input side of the voltage regulating transformer T2 is connected between the neutral line N and the phase lines of the a phase, b phase and c phase of the three-phase transformer T1. The first sub-switch K1 is connected to the path between the a phase, b phase and c phase and the input side of the voltage regulating transformer T2. a , the second sub switch K b and the third sub-switch K c The output side of the voltage regulating transformer T2 is connected between the neutral line N and the protective ground line PE through the second switch K2.

[0047] Figure 2 1 is a flow chart of a grounding control method for a distribution network provided by an embodiment of the present invention. Figure 2 , the grounding control method provided by the embodiment of the present invention includes:

[0048] S1, obtain the current on the live wire.

[0049] Exemplarily, an ammeter may be connected in series with the live wire to monitor the current value on the live wire. Optionally, the temperature of the live wire may also be obtained. Since an excessive current in the live wire may cause the temperature of the live wire to rise abnormally, the operation of the distribution network may be monitored by monitoring the temperature of the live wire. A first preset temperature may be set, and when the temperature of the live wire exceeds the first preset temperature, an alarm is issued.

[0050] S2. When the current is greater than or equal to a first preset current, it is determined that a leakage occurs in the distribution network.

[0051] The first preset current is a preset current value used to determine whether there is a leakage in the distribution network. When a leakage occurs in the distribution network, the current on the live wire at this time will be much greater than the current on the live wire when the distribution network is operating normally, and the first preset current can be set accordingly. The first preset current is greater than the current on the live wire when the distribution network is operating normally, and is less than the current on the live wire when a leakage occurs in the distribution network. When the current is greater than or equal to the first preset current, it is determined that a leakage occurs in the distribution network. In specific implementation, the size of the first preset current can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0052] For example, taking a three-phase power distribution network as an example, when a single-phase grounding fault occurs, the faulty phase is equivalent to grounding, and its maximum overvoltage can reach 2 times the system rated phase voltage, and the maximum current of the other two phases can reach three times that of normal conditions, and the maximum overvoltage can reach 3.5 times the system rated phase voltage, and the voltage at the neutral point is no longer zero, resulting in single-phase leakage. If a three-phase power distribution network operates with a single-phase grounding fault for a long time, it will cause the insulation weaknesses in the distribution network to be broken down, resulting in a short circuit.

[0053] S3. The grounding control unit 100 applies a potential to the neutral line N that is equal in magnitude to the leakage potential and opposite in phase.

[0054] Taking the three-phase power distribution network as an example, when a leakage fault occurs in one phase of the three-phase transformer T1, the second switch K2 and the sub-switch corresponding to the leakage fault are closed, the input side of the voltage-regulating transformer T2 is connected between the phase line and the neutral line N of the fault phase, and the output side of the voltage-regulating transformer T2 is connected between the neutral line N and the protective ground line PE. At the same time, the first switch K1 needs to be disconnected to prevent the live wire from being directly connected to the protective ground line PE through the input side of the voltage-regulating transformer T2. By adjusting the coil turns ratio of the input side and the output side of the voltage-regulating transformer T2, the potential between the phase line and the neutral line N of the fault phase will be converted into a compensation potential with the same amplitude as the leakage potential through the voltage-regulating transformer T2.

[0055] For example, reference Figure 1 If a phase leakage fault occurs, the second switch K2 and the first sub-switch K a Closed, the first switch K1 is opened. In this way, the input side of the voltage regulating transformer T2 is connected between the phase line of phase a and the neutral line N, and the output side of the voltage regulating transformer T2 is connected between the neutral line N and the protective ground line PE. The voltage of the fault phase a is converted into a compensation voltage with the same amplitude as the leakage potential by the voltage regulating transformer T2, and is output from the output side of the voltage regulating transformer T2 to offset the leakage potential. At the same time, since the starting end of the coil on the input side of the voltage regulating transformer T2 is located on the side of the neutral line N, and the starting end of the output side of the voltage regulating transformer T2 is located on the side of the protective ground line PE, the compensation voltage output by the output side of the voltage regulating transformer T2 is exactly half a cycle out of phase with the leakage potential, that is, 180°, so that the compensation voltage can just offset the leakage potential.

[0056] The embodiments of the present invention provide a grounding control method, device, equipment and storage medium for a distribution network. When a leakage fault is detected, a potential with an amplitude equal to and a phase opposite to the leakage potential can be applied between the neutral line and the ground line by connecting a voltage regulating transformer and adjusting the turns ratio of the input coil and the output coil of the voltage regulating transformer, thereby quickly clamping the neutral line-to-ground voltage to zero and eliminating the residual current of the leakage fault. In addition, the input side of the voltage regulating transformer directly obtains the potential from the fault point of the distribution network, and the obtained compensation potential is stable relative to the leakage potential waveform and has a high signal-to-noise ratio.

[0057] Figure 3 is a flow chart of another grounding control method for a distribution network provided by an embodiment of the present invention, with reference to Figure 3 , the grounding control method provided by the embodiment of the present invention includes:

[0058] S1, obtain the current on the live wire.

[0059] S2. When the current is greater than or equal to a first preset current, it is determined that a leakage occurs in the distribution network.

[0060] S3. The grounding control unit 100 applies a potential to the neutral line N that is equal in magnitude to the leakage potential and opposite in phase.

[0061] S4. When the current is less than the first preset current, it is determined that the power supply of the distribution network is normal.

[0062] It should be noted that S2 and S4 are mutually exclusive, and one of S2 and S4 is selected for execution according to the current on the live wire.

[0063] S5. The grounding control unit 100 controls the neutral line N to be directly grounded.

[0064] If there is no leakage fault in the distribution network, the grounding control unit 100 does not need to connect the voltage regulating transformer T2 to the circuit, and the distribution network is in a normal working state. Figure 1 , the first switch K1 is closed, the neutral point of the three-phase transformer T1 is directly connected to the protective ground wire PE, the second switch K2 and the first sub-switch K a , the first sub switch K b and the first sub-switch K c All disconnected.

[0065] S6. Output the alarm information of power distribution network leakage.

[0066] Specifically, after the grounding control unit 100 applies a potential with the same amplitude and opposite phase to the leakage potential to the neutral line N, it is necessary to notify the maintenance personnel of the distribution network leakage alarm information in some way, and the alarm method includes but is not limited to: sounding an alarm or lighting an alarm light.

[0067] S7. Continue to obtain the current on the live line. When the current is less than the first preset current, the grounding control unit 100 controls the neutral line N to be directly grounded.

[0068] Specifically, when the current on the live wire is less than the first preset current, it means that the leakage fault has been eliminated and the current of the distribution network has returned to normal. It is necessary to disconnect the distribution network from the voltage regulating transformer T2 and directly ground the neutral wire N to restore normal power supply.

[0069] Optionally, the grounding control unit 100 includes a first switch K1, a second switch K2, a third switch K3 and a voltage regulating transformer T2, wherein a first end of the first switch K1 is connected to a neutral line N, a second end of the first switch K1 is connected to a ground line, a first end of the second switch K2 is connected to a neutral line N, a second end of the second switch K2 is connected to a first output end of the voltage regulating transformer T2, a second output end of the voltage regulating transformer T2 is connected to a ground line, a first input end of the voltage regulating transformer T2 is connected to a neutral line N, a second input end of the voltage regulating transformer T2 is connected to a second end of the third switch K3, and a first end of the third switch K3 is connected to a live line;

[0070] When the grounding control unit 100 controls the neutral line N to be directly grounded, the first switch K1 is closed, and the second switch K2 and the third switch K3 are opened;

[0071] When the grounding control unit 100 controls to apply a potential having the same amplitude and opposite phase as the leakage potential to the neutral line N, the first switch K1 is opened, and the second switch K2 and the third switch K3 are closed.

[0072] Optionally, the distribution network is a three-phase power distribution network, and the third switch K3 includes a first sub-switch K a , the second sub switch K b and the third sub-switch K c When it is determined that at least one live wire has leakage, the grounding control unit 100 controls the corresponding sub-switch to close.

[0073] For example, reference Figure 1 The third switch K3 includes a first sub-switch K a , the second sub switch K b and the third sub-switch K c For the first switch K1, the second switch K2, the first sub-switch K a , the second sub switch K b 、The third sub switch K c, the output side of the voltage regulating transformer T2 and the output side of the voltage regulating transformer T2, the interface located at the top is its first end, and the interface located at the bottom is its second end. Preferably, the rated voltage of the output side and the output side of the voltage regulating transformer T2 are both 220V, and the rated power of the voltage regulating transformer T2 is 15kVA. The first end of the first switch K1 is connected to the neutral line N, and the second end of the first switch K1 is connected to the protective ground line PE; the first end of the second switch K2 is connected to the neutral line N, and the second end of the second switch K2 is connected to the first output end of the voltage regulating transformer T2; the second output end of the voltage regulating transformer T2 is connected to the protective ground line PE, the first input end of the voltage regulating transformer T2 is connected to the neutral line N, and the second input end of the voltage regulating transformer T2 is respectively connected to the first sub-switch K a , the second sub switch K b and the third sub-switch K c The second end of the first sub-switch K a , the second sub switch K b and the third sub-switch K c The first ends of the first switch K1 and the second switch K2 are connected to the corresponding phase lines of phase a, phase b and phase c. a , the second sub switch K b and the third sub-switch K c When both are disconnected, the neutral point of the three-phase transformer T1 is directly grounded, and the voltage regulating transformer T2 is not connected to the circuit. a , the second sub switch K b and the third sub-switch K c When one of them is closed, the voltage regulating transformer T2 is connected to the circuit.

[0074] For example, reference Figure 1 When a leakage fault occurs in one phase of the three-phase power distribution network, the sub-switch corresponding to the fault is closed, and the input side of the voltage regulating transformer T2 is connected between the phase line and the neutral line N of the faulty phase, so that the output side of the voltage regulating transformer T2 outputs a compensation potential with an amplitude equal to the leakage potential and an opposite phase, thereby eliminating the leakage fault current.

[0075] Optionally, the grounding control unit 100 satisfies the following conditions when it operates:

[0076] The first switch K1 and the third switch K3 are prohibited from being closed at the same time;

[0077] Before the first switch K1 is opened, the second switch K2 is closed first;

[0078] When the leakage protection is exited, the third switch K3 is opened first, then the first switch K1 is closed, and finally the second switch K2 is opened.

[0079] For example, reference Figure 1, if the first sub-switch K a , the second sub switch K b and the third sub-switch K c If one of them is closed at the same time as the first switch K1, the phase line of one phase of the three-phase transformer T1 will be connected to the protective ground line PE through the input side of the voltage regulating transformer T2, which will cause excessive current in this path and cause a short circuit, causing damage to the equipment. Therefore, the first sub-switch K a , the second sub switch K b and the third sub-switch K c The first switch K1 and the second switch K2 cannot be closed at the same time. If the first switch K1 is disconnected, the second switch K2 is in the open state, and the neutral point of the three-phase transformer T1 is not connected to the protective ground wire PE. In this case, if a single-phase grounding occurs in the three-phase transformer T1, the current of the other two phases will increase to three times the normal level, which poses a great safety hazard. Therefore, after the leakage fault is eliminated and the leakage protection is exited, the correct order is to first disconnect the first sub-switch K1. a , the second sub switch K b and the third sub-switch K c , then close the first switch K1, and finally open the second switch K2.

[0080] According to the same inventive concept, an embodiment of the present invention provides a grounding control device for a distribution network. Figure 4 is a structural block diagram of a grounding control device for a distribution network provided by an embodiment of the present invention, with reference to Figure 4 , the grounding control device of the distribution network includes:

[0081] A current acquisition module 1 is used to acquire the current on the live wire;

[0082] The leakage detection module 2 is used to determine that leakage occurs in the distribution network when the current is detected to be greater than or equal to a first preset current;

[0083] The control module 3 is used to control the grounding control unit to apply a potential with the same amplitude and opposite phase as the leakage potential to the neutral line when the leakage detection module 1 determines that leakage occurs in the distribution network.

[0084] For example, reference Figure 1 The current acquisition module 1 acquires the current on the phase lines of phases a, b and c, and outputs the current on the phase lines of phases a, b and c to the leakage detection module 2. When the leakage detection module 2 detects that the current is greater than or equal to the first preset current, it is determined that leakage occurs in the distribution network. If a leakage fault occurs in phase a, the control module 3 controls the second switch K2 and the first sub-switch K aClosed, the first switch K1 is opened. In this way, the input side of the voltage regulating transformer T2 is connected between the phase line of phase a and the neutral line N, and the output side of the voltage regulating transformer T2 is connected between the neutral line N and the protective ground line PE. The voltage of the fault phase a is converted into a compensation voltage with the same amplitude as the leakage potential by the voltage regulating transformer T2, and is output from the output side of the voltage regulating transformer T2 to offset the leakage potential. At the same time, since the starting end of the coil on the input side of the voltage regulating transformer T2 is located on the side of the neutral line N, and the starting end of the output side of the voltage regulating transformer T2 is located on the side of the protective ground line PE, the compensation voltage output by the output side of the voltage regulating transformer T2 is exactly half a cycle out of phase with the leakage potential, that is, 180°, so that the compensation potential can offset the leakage potential.

[0085] The grounding control device provided in the embodiment of the present invention can execute the grounding control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0086] According to the same inventive concept, an embodiment of the present invention provides a grounding control device for a distribution network, including:

[0087] one or more processors;

[0088] A memory for storing one or more programs;

[0089] When one or more programs are executed by one or more processors, the one or more processors implement the grounding control method provided by any embodiment of the present invention.

[0090] According to the same inventive concept, an embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the grounding control method provided by any embodiment of the present invention is implemented.

[0091] Figure 5 : is a structural schematic diagram of a grounding control device for a distribution network provided by an embodiment of the present invention. The grounding control device for a distribution network is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The grounding control device for a distribution network may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0092] like Figure 5As shown, the grounding control device 10 of the distribution network includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the grounding control device 10 of the distribution network can also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0093] A plurality of components in the grounding control device 10 of the power distribution network are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the grounding control device 10 of the power distribution network to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0094] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a grounding control method for a distribution network.

[0095] In some embodiments, the grounding control method for the distribution network may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the grounding control device 10 for the distribution network via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the grounding control method for the distribution network described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the grounding control method for the distribution network in any other appropriate manner (e.g., by means of firmware).

[0096] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0097] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0098] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0099] To provide interaction with a user, the systems and techniques described herein may be implemented on a grounding control device of a power distribution network, which has: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball), through which a user can provide input to the grounding control device of the power distribution network. Other types of devices may also be used to provide interaction with a user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0100] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0101] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0102] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0103] The above specific implementations do not constitute a limitation on the scope of protection of this invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of this invention shall be included in the scope of protection of this invention.

Claims

1. A grounding control method for a distribution network, characterized in that: The power distribution network comprises a live wire, a neutral wire and a ground wire, a load is arranged between the live wire and the neutral wire, a ground control unit is arranged between the neutral wire and the ground wire, and one end of the ground control unit is connected to the live wire; The grounding control method comprises: obtaining the current on the live wire; When the current is greater than or equal to a first preset current, determining that a leakage occurs in the distribution network; The grounding control unit applies a potential having an equal magnitude and an opposite phase to the leakage potential to the neutral line.

2. The grounding control method of the distribution network according to claim 1, characterized in that: After obtaining the current on the live wire, the method further includes: When the current is less than the first preset current, it is determined that the power supply of the power distribution network is normal; The grounding control unit controls the neutral line to be directly grounded.

3. The grounding control method of the distribution network according to claim 1, characterized in that: After the grounding control unit applies a potential having the same magnitude and opposite phase as the leakage potential to the neutral line, the method further comprises: Output the alarm information of power distribution network leakage.

4. The grounding control method of the distribution network according to claim 1, characterized in that: After the grounding control unit applies a potential having the same magnitude and opposite phase as the leakage potential to the neutral line, the method further comprises: The current on the live wire is continuously obtained, and when the current is less than the first preset current, the grounding control unit controls the neutral wire to be directly grounded.

5. The grounding control method of the distribution network according to claim 1, characterized in that: The grounding control unit comprises a first switch, a second switch, a third switch and a voltage regulating transformer, wherein a first end of the first switch is connected to the neutral line, a second end of the first switch is connected to the ground line, a first end of the second switch is connected to the neutral line, a second end of the second switch is connected to the first output end of the voltage regulating transformer, a second output end of the voltage regulating transformer is connected to the ground line, a first input end of the voltage regulating transformer is connected to the neutral line, a second input end of the voltage regulating transformer is connected to the second end of the third switch, and a first end of the third switch is connected to the live line; When the grounding control unit controls the neutral line to be directly grounded, the first switch is closed, and the second switch and the third switch are opened; When the grounding control unit controls the neutral line to apply a potential with an amplitude equal to the leakage potential and an opposite phase, the first switch is opened, and the second switch and the third switch are closed.

6. The grounding control method of the distribution network according to claim 5, characterized in that: The power distribution network is a three-phase power distribution network, and the third switch includes a first sub-switch, a second sub-switch and a third sub-switch; When it is determined that at least one live wire has leakage, the grounding control unit controls the corresponding sub-switch to close.

7. The grounding control method of the distribution network according to claim 5, characterized in that: The grounding control unit meets the following conditions when it is in operation: The first switch and the third switch are prohibited from being closed at the same time; Before the first switch is opened, the second switch is closed first; When the leakage protection is exited, the third switch is opened first, then the first switch is closed, and finally the second switch is opened.

8. A grounding control device for a distribution network, characterized in that: include: A current acquisition module, used for acquiring the current on the live wire; A leakage detection module, used to determine that leakage occurs in the distribution network when detecting that the current is greater than or equal to a first preset current; The control module is used to control the grounding control unit to apply a potential equal to the leakage potential amplitude and opposite to the phase to the neutral line when the leakage detection module determines that the distribution network has leakage.

9. A grounding control device for a distribution network, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the grounding control method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the grounding control method according to any one of claims 1 to 7 is implemented.

Images