Line de-icing method and line de-icing device without power interruption for power distribution network

Abstract

This invention discloses a method and device for de-icing lines in a power distribution network. The method includes: determining an initial capacitance value of an adjustable capacitor and adjusting its actual capacitance value to the initial value; wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, which are connected to multiple phases of the target power distribution network; based on the initial capacitance value, performing charging and discharging operations on the adjustable capacitor to determine a target capacitance value and a target charging end time; and based on the target capacitance value and the target charging end time, controlling the multiple capacitor charging and discharging circuits to de-ice the multiple phases of the line. This invention solves the technical problem of current thermal de-icing technologies requiring interruption of power supply to the line and relying on external DC or AC power to create a short-circuit current to heat and melt the ice in the conductors.

Description

Technical Field

[0001] This invention relates to the field of power system de-icing technology, and more specifically, to a method for de-icing power lines in a power distribution network and a power-on-line de-icing device. Background Technology

[0002] Ice storms are a common natural disaster in power systems, causing large-scale and prolonged outages of transmission and distribution lines, severely impacting the safe and stable operation of the power grid and resulting in huge losses. Current de-icing methods are mainly divided into mechanical de-icing, natural de-icing, and thermal de-icing. Mechanical de-icing relies on manual chipping of ice, requiring power outages, resulting in low efficiency, high labor intensity, poor safety, and potential damage to line equipment. Natural de-icing methods, such as counterweights or hydrophobic coatings, can only partially delay icing, cannot actively melt ice, and are unreliable and short-lived. Thermal de-icing is currently the most widely used method in distribution networks. Its principle is to artificially create a short-circuit loop, applying an external DC or AC power source to allow a large current to flow through the iced conductors, utilizing the Joule heating effect to melt the ice. However, this requires interrupting power supply to the line during de-icing, isolating the line from the grid and connecting it to an external power source, causing power outages for users and failing to meet the continuous power supply needs of high-reliability power supply areas.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a method for de-icing power distribution networks and a device for de-icing power distribution networks without power interruption, so as to at least solve the technical problem that current thermal de-icing technology requires interrupting the power supply to the lines and relying on external DC or AC power to generate short-circuit current in order to heat up and de-ic the conductors.

[0005] According to one aspect of the present invention, a method for de-icing lines in a distribution network is provided, comprising: determining an initial capacitance value of an adjustable capacitor and adjusting the actual capacitance value of the adjustable capacitor to the initial capacitance value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to multiple phases of the target distribution network; performing charging and discharging operations on the adjustable capacitor based on the initial capacitance value, and determining a target capacitance value and a target charging end time of the adjustable capacitor; and controlling the multiple capacitor charging and discharging circuits respectively to de-ic the lines of the multiple phases based on the target capacitance value and the target charging end time.

[0006] Optionally, based on the initial capacitance value, the adjustable capacitor is charged and discharged to determine the target capacitance value and the target charging end time. This includes: starting the charging circuit in the multiple capacitor charging and discharging circuits at the beginning of the preset voltage cycle for each of the multiple phases; turning off the charging circuit and turning on the discharging circuit when the charging current of the adjustable capacitor is less than a preset current threshold, and recording the initial charging end time; recording the effective current value of each of the multiple phases when the current fluctuation range of the multiple phases is less than a preset fluctuation threshold; determining whether the effective current value of each of the multiple phases is greater than the line current carrying threshold when the effective current value of each of the multiple phases is greater than the preset de-icing current threshold; and using the initial capacitance value as the target capacitance value and the initial charging end time as the target charging end time when the effective current value of each of the multiple phases is not greater than the line current carrying threshold.

[0007] Optionally, if the effective value of the current of each of the multiple phases is not greater than the preset de-icing current threshold, the initial capacitance value is gradually increased, and the charging and discharging process of the multiple capacitor charging and discharging circuits is repeated until the effective value of the current of each of the multiple phases is greater than the preset de-icing current threshold. The increased initial capacitance value is then used as the target capacitance value.

[0008] Optionally, if the effective value of the current in each of the multiple phases is greater than the line current carrying threshold, the initial charging end time is gradually reduced, and the charging and discharging process of multiple capacitor charging and discharging circuits is repeated until the effective value of the current in each of the multiple phases is not greater than the line current carrying threshold. The reduced initial charging end time is then taken as the target charging end time.

[0009] Optionally, the capacitor charging and discharging circuit has a symmetrical structure.

[0010] According to another aspect of the present invention, a line de-icing device without power interruption is also provided, comprising: a controller for executing any of the above-described line de-icing methods for a distribution network; a capacitor charging and discharging circuit for receiving control from the controller and performing charging and discharging operations on an adjustable capacitor; a line connection module for connecting the capacitor charging and discharging circuit to multiple phases of the target distribution network; and a voltage and current acquisition module for acquiring current and voltage data of the multiple phases of the line and transmitting them to the controller.

[0011] According to another aspect of the present invention, a line de-icing device for a power distribution network is also provided, comprising: a first determining module, configured to determine an initial capacitance value of an adjustable capacitor and adjust the actual capacitance value of the adjustable capacitor to the initial capacitance value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to multiple phases of the target power distribution network; a second determining module, configured to perform charging and discharging operations on the adjustable capacitor based on the initial capacitance value, and determine a target capacitance value and a target charging end time of the adjustable capacitor; and a control module, configured to control the multiple capacitor charging and discharging circuits respectively based on the target capacitance value and the target charging end time to de-ic the multiple phases of the line.

[0012] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is running, it controls the device where the non-volatile storage medium is located to execute any of the above-described line de-icing methods for power distribution networks.

[0013] According to another aspect of the present invention, a computer device is also provided, the computer device including a processor, the processor being configured to run a program, wherein the program, when running, executes any of the above-described line de-icing methods for power distribution networks.

[0014] According to another aspect of the present invention, a computer program product is also provided, including a computer program that, when executed by a processor, implements any of the above-described line de-icing methods for power distribution networks.

[0015] In this embodiment of the invention, a line de-icing method for power distribution networks is adopted. This method determines the initial capacitance value of an adjustable capacitor and adjusts its actual capacitance value to the initial value. The adjustable capacitor is located in multiple capacitor charging and discharging circuits, which are connected to multiple phases of the target power distribution network. Based on the initial capacitance value, the adjustable capacitor is charged and discharged to determine the target capacitance value and the target charging end time. Based on the target capacitance value and the target charging end time, the multiple capacitor charging and discharging circuits are controlled to de-ic the multiple phases of the lines, achieving uniform and efficient de-icing. This achieves the technical effect of synchronous, precise, and safe de-icing of multi-phase lines without power interruption, thus solving the technical problem of current thermal de-icing technologies that require interrupting power supply and relying on external DC or AC power to create a short-circuit current to heat and melt the conductors. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 A hardware block diagram of a computer terminal for implementing a line de-icing method for a power distribution network is shown.

[0018] Figure 2 This is a schematic flowchart of a line de-icing method for a power distribution network provided according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of an AC short-circuit de-icing method provided by an optional embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a DC de-icing method provided by an optional embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the control logic of an ice-melting device according to an optional embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the effective charging current values ​​corresponding to adjustable capacitors 150uf and 190uf according to an optional embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of an adjustable capacitor charging current waveform provided by an optional embodiment of the present invention;

[0024] Figure 8 This is a topology diagram of a circuit-uninterrupted de-icing device for a controllable charging and discharging capacitor provided by an optional embodiment of the present invention;

[0025] Figure 9 This is a structural block diagram of a line de-icing device for a power distribution network provided according to an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] According to an embodiment of the present invention, a method for melting ice on power distribution lines is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0029] The method embodiment provided in Embodiment 1 of this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal for implementing a line de-icing method for power distribution networks is shown. Figure 1 As shown, the computer terminal 10 may include one or more processors (shown as 102a, 102b, ..., 102n in the figure) (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0030] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10. As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0031] The memory 104 can be used to store software programs and modules for application software, such as the program instructions / data storage device corresponding to the line de-icing method for power distribution networks in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby implementing the aforementioned application program for the line de-icing method for power distribution networks. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0032] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10.

[0033] Figure 2 This is a schematic flowchart of a line de-icing method for a power distribution network provided according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes the following steps:

[0034] Step S201: Determine the initial capacitance value of the adjustable capacitor and adjust the actual capacitance value of the adjustable capacitor to the initial capacitance value. The adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are connected to the lines of multiple phases of the target distribution network.

[0035] In this step, thermal de-icing is the most commonly used de-icing method in power distribution networks. Its principle is based on the Joule heating effect of conductors; by increasing the current flowing through the conductors, the conductors are heated, thus achieving the purpose of de-icing. Currently, there are various types of thermal de-icing equipment for power distribution networks, such as active mobile de-icing devices (DC / AC), segmented AC de-icing devices, pickup truck-type multi-functional emergency DC de-icing devices, and low-voltage extended DC de-icing devices. For example, Figure 3 This is a schematic diagram of an AC short-circuit de-icing method according to an optional embodiment of the present invention. Figure 4 This is a schematic diagram of a DC de-icing method provided by an optional embodiment of the present invention. Figure 3 and Figure 4 As shown, in principle, both methods are de-icing methods aimed at creating a short-circuit current. The iced line is de-energized, and an additional AC or DC power supply is added to artificially create a short-circuit loop, causing a large current to flow through the iced line, heating the conductors, and thus achieving the purpose of de-icing. It is worth noting that all the above equipment and methods require interrupting power transmission and adding additional AC or DC power during de-icing, which is unacceptable for high-voltage power supply lines.

[0036] Therefore, to achieve uninterrupted ice melting in the distribution network, the initial capacitance value of the adjustable capacitors can be determined first. This value is preset based on the voltage level of the target distribution network (e.g., 10kV) and typical ice melting current requirements (e.g., 200A). Referring to experimental data and capacitor model characteristics, the smallest setting that meets the minimum ice melting current threshold is selected as the initial value to avoid overload and ensure safe startup. This initial capacitance value is synchronously set to the independent adjustable capacitor devices in each of the three phases of the system. Each phase is equipped with an independent capacitor charging and discharging circuit, connected to the A, B, and C phases of the power grid respectively, ensuring symmetrical three-phase operation. Through the power electronic control unit, the actual capacitance value of the adjustable capacitor in each capacitor charging and discharging circuit is precisely adjusted to this initial set value, for example, set to 150μF. This allows the three phases to synchronously and symmetrically charge and discharge during the positive and negative half-cycles of the voltage, thereby artificially injecting controllable periodic capacitive reactive current without interrupting power supply, thus increasing the effective value of the total line current. Because the three-phase circuit structure is completely symmetrical, the uniform adjustment of the capacitor value ensures the balance of current injection, avoids the generation of negative sequence components that may cause disturbance to the power grid, and lays a stable foundation for subsequent fine-tuning based on measured current feedback, thus realizing the core control logic of "initial symmetrical input and dynamic precise control".

[0037] Step S202: Based on the initial capacitance value, perform charging and discharging operations on the adjustable capacitor to determine the target capacitance value and target charging end time of the adjustable capacitor.

[0038] In this step, after determining the initial capacitance value, a three-phase symmetrical controllable charging and discharging operation can be initiated. Power electronic switches precisely control the charging and discharging sequence of the capacitor within each phase voltage half-cycle: the charging circuit is immediately turned on after the voltage crosses zero, allowing the capacitor to draw capacitive current from the grid. Once the charging current naturally decays to zero or reaches the preset charging time (e.g., 5ms), the charging switch is quickly locked, and the discharging circuit is simultaneously opened, allowing the capacitor to completely release its stored energy to ground, preparing for the next charging cycle. During this process, the voltage and current acquisition device monitors the effective value of the total line current and the capacitor charging waveform in real time and feeds it back to the control unit. If the measured current is lower than the minimum de-icing threshold (e.g., 200A), the adjustable capacitance value is gradually increased (e.g., from 150μF to 190μF) to increase the charging amplitude. If the current exceeds the line's safety limit or requires precise control, the effective current value is reduced by shortening the charging conduction time (e.g., from 5ms to 3ms) while maintaining the capacitance value, thus achieving fine current adjustment without changing the capacitor capacity. This process is based on the periodic relationship between the capacitor charging current and voltage waveforms. Combined with the experimental data, a mapping model of "capacitance value - current amplitude - charging time" is established to dynamically optimize the target capacitance value and the target charging end time. Ultimately, under the premise of ensuring line safety, the injected capacitive reactive current is precisely matched with the de-icing requirements, realizing true "uninterrupted, adjustable, and adaptive" de-icing control.

[0039] Taking the positive half-cycle of phase A voltage as an example, the charging circuit is activated at the start of the positive half-cycle, and the capacitor charges. Charging ends when the capacitor charging current reaches zero, and the power electronic switch of the charging circuit is locked. Simultaneously, the power electronic switch of the discharge circuit is activated, allowing the capacitor to fully discharge to ground, meeting the high-current de-icing requirements of the next charging cycle. After the current stabilizes, the effective value of the line current and the waveform of the current generated by the equipment are recorded. When the effective value of the line current is less than the minimum de-icing current, the equipment is locked, and the adjustable capacitor value is adjusted to a higher level, increasing the capacitor C value to increase the charging current and thus the total current of the distribution line. The capacitor C value is increased step by step until the total current of the distribution line exceeds the minimum line de-icing current value. When the steady-state de-icing current value of the line is greater than the minimum line de-icing current value but higher than the line's current carrying capacity, or when a specific line current value is required, the charging circuit closing time is adjusted based on the steady-state waveform of the charging current. The charging time is reduced in milliseconds, thereby lowering the effective value of the charging current and the effective value of the distribution line current to meet the application current requirements.

[0040] Step S203: Based on the target capacitance value and the target charging end time, control multiple capacitor charging and discharging circuits respectively to melt ice on multiple phase lines.

[0041] In this step, after determining the target capacitance value and the target charging end time, the control unit synchronously sends precise commands to the three-phase independent capacitor charging and discharging circuits. This ensures that the power electronic switch of each phase strictly adheres to the set capacitance (e.g., 190μF) and charging duration (e.g., 3ms) to perform periodic charging and discharging operations. At the beginning of each phase's positive half-cycle, the corresponding charging circuit is synchronously turned on, allowing the capacitor to absorb reactive current from the grid. At the preset time point, the charging switch is immediately turned off, simultaneously triggering the discharge circuit to rapidly release the capacitor's energy to ground, preparing for the next charging cycle. The negative half-cycle is handled similarly, with symmetrical operation achieved through a reverse-parallel symmetrical circuit. This ensures that the three-phase current waveforms are perfectly matched, with equal amplitudes and a 120° phase difference, thus stably injecting a three-phase symmetrical capacitive pulse current without introducing negative or zero-sequence components. This current, superimposed on the original load current, effectively increases the effective value of the total line current, reaching the thermal effect threshold required for de-icing. Because the three-phase circuit structure, parameters and control logic are completely consistent and are all uniformly scheduled by the same control unit, millisecond-level synchronous response can be achieved, ensuring that the de-icing current is evenly distributed throughout the entire line, avoiding local overheating or uneven de-icing, and ultimately achieving safe, stable and efficient uninterrupted de-icing operation of the entire distribution network without interrupting power supply or adding external power.

[0042] Through the above steps, the goal of uniform and efficient melting of ice is achieved, thereby realizing the technical effect of synchronous, precise and safe ice melting of multi-phase lines without power interruption. This solves the technical problem that current thermal ice melting technology requires interruption of line power supply and reliance on external DC or AC power to create short-circuit current to heat up the conductors and melt the ice.

[0043] As an optional embodiment, based on the initial capacitance value, the adjustable capacitor is charged and discharged to determine the target capacitance value and the target charging end time. This includes: starting the charging circuit in the multiple capacitor charging and discharging circuits at the beginning of the preset voltage cycle of each of the multiple phases; turning off the charging circuit in the multiple capacitor charging and discharging circuits and turning on the discharging circuit in the multiple capacitor charging and discharging circuits when the charging current of the adjustable capacitor is less than a preset current threshold, and recording the initial charging end time; recording the effective current value of each of the multiple phases when the current fluctuation range of each of the multiple phases is less than a preset fluctuation threshold; determining whether the effective current value of each of the multiple phases is greater than a preset de-icing current threshold when the effective current value of each of the multiple phases is greater than a line current bearing threshold when the effective current value of each of the multiple phases is not greater than the line current bearing threshold when the initial capacitance value is taken as the target capacitance value and the initial charging end time is taken as the target charging end time.

[0044] Optionally, when initiating the de-icing operation, based on a preset initial capacitance value (e.g., 150μF), at the start of the positive and negative half-waves of each three-phase voltage cycle, the charging circuits in the capacitor charging and discharging circuits of each phase are simultaneously activated, allowing the capacitors to absorb capacitive current from the grid. When the charging current of any phase is detected to naturally decay to near zero (less than a preset current threshold), the charging switch of that phase is immediately turned off, and the discharging circuit is simultaneously activated, allowing the capacitor to be completely discharged to ground, ensuring that charging can continue in the next cycle. The initial charging end time is recorded at this point. During this continuous cycle, the voltage and current acquisition device continuously monitors the total current waveform and effective value of the three-phase lines. When the fluctuation amplitude of the three-phase current stabilizes within a preset threshold (e.g., ±5%), the system records the actual effective current value of each phase at this time. If the effective values ​​of the three-phase currents are all higher than the minimum threshold required for de-icing (e.g., 200A) and do not exceed the line's safe withstand limit (e.g., 300A), it is determined that the current combination of capacitance value and charging time meets the de-icing requirements. No adjustment is needed; the initial capacitance value is directly used as the target capacitance value, and the initial charging end time is used as the target charging end time, entering continuous de-icing mode. This process relies on three-phase symmetrical control and real-time closed-loop feedback. It requires no external power supply and uses only the grid voltage to achieve precise enhancement of the effective current value through the charging and discharging of a controllable capacitor. It takes into account safety, symmetry and adaptability, and achieves true "one-click adaptation, plug and melt" ice melting without power supply.

[0045] As an optional embodiment, if the effective value of the current of each of the multiple phases is not greater than the preset de-icing current threshold, the initial capacitance value is gradually increased, and the charging and discharging process of multiple capacitor charging and discharging circuits is repeated until the effective value of the current of each of the multiple phases is greater than the preset de-icing current threshold. The increased initial capacitance value is then used as the target capacitance value.

[0046] Optionally, if the effective value of the three-phase line current is still lower than the preset de-icing current threshold (e.g., 200A) after the initial charge-discharge cycle, the system will automatically activate a stepped increase strategy for the capacitance value, gradually increasing the set value of the adjustable capacitance of each phase (e.g., from 150μF to 190μF), and simultaneously repeating the three-phase symmetrical charge-discharge operation: at the beginning of the positive and negative half-waves of each phase voltage cycle, the corresponding charging circuit is triggered; when the charging current decays to zero, charging is stopped and discharging is started, maintaining periodic capacitive current injection. After each adjustment of the capacitance value, the system waits for the current waveform to stabilize, collects the effective value of the three-phase current, and compares it with the de-icing threshold. Since increasing the capacitance value will directly increase the amplitude and effective value of the charging current, the current response exhibits a predictable nonlinear growth trend. Combined with experimental data (e.g., 150μF corresponds to 200A, 190μF corresponds to 250A), the system can accurately determine whether the target is met after increasing the threshold. When the effective values ​​of the three-phase currents simultaneously exceed the de-icing threshold but remain within a safe range, the current capacitance value is locked as the final target capacitance value, adjustment stops, and the process enters a stable de-icing phase. This process is entirely driven by the grid voltage and requires no external power supply. Through three-phase synchronous, step-by-step increasing, and real-time feedback closed-loop control, it ensures that the de-icing current meets thermal requirements while avoiding overload, achieving an intelligent and adaptive uninterrupted de-icing start-up process.

[0047] As an optional embodiment, when the effective value of the current in each of the multiple phases is greater than the line current carrying threshold, the initial charging end time is gradually reduced, and the charging and discharging process of multiple capacitor charging and discharging circuits is repeated until the effective value of the current in each of the multiple phases is not greater than the line current carrying threshold. The reduced initial charging end time is then taken as the target charging end time.

[0048] Optionally, when the effective value of the three-phase line current exceeds the de-icing threshold but approaches or exceeds the line's safe withstand limit (e.g., 300A), a fine-tuning mechanism for charging duration will be activated while maintaining the current target capacitance value. This mechanism will progressively shorten the charging conduction time of each phase capacitor in fixed steps (e.g., 1ms). Specifically, after the voltage cycle begins, the charging circuit is prematurely shut off, forcing the capacitor to stop charging before it is fully charged to zero and simultaneously opening the discharge circuit. This reduces the amplitude and effective value of the injected capacitive reactive current within a single cycle. After each duration adjustment, the three-phase line current waveform is collected in real time, and its stability is assessed to determine if it has fallen back to within the safe threshold. Since charging time and effective current value are non-linearly positively correlated, shortening the charging duration can effectively "shaving off peaks" without disrupting waveform symmetry, ensuring a synchronous decrease in the three-phase current. When the effective values ​​of the three-phase current are all stable below the current withstand threshold and still not below the minimum de-icing requirement, the charging end time at this point is locked as the final target charging end time, and the system enters a long-term stable operation mode. This strategy achieves fine-tuning of the current by precisely controlling the charging time without increasing equipment capacity or interrupting power supply, balancing the ice-melting effect with grid safety, and demonstrating the system's adaptive, refined, and disturbance-free intelligent control capabilities.

[0049] As an optional embodiment, the capacitor charging and discharging circuit has a symmetrical structure.

[0050] Optionally, the capacitor charging and discharging circuit adopts a symmetrical structure, which is a key design feature to ensure efficient and balanced injection of controllable capacitive current during both the positive and negative half-cycles of the three-phase power grid voltage. Each phase circuit consists of two sets of anti-parallel power electronic switch circuits and the same adjustable capacitor, corresponding to the charging and discharging paths during the positive and negative half-cycles of the voltage, respectively: during the positive half-cycle, one set of switches is turned on, charging the capacitor from the phase line to the neutral point; during the negative half-cycle, the other set of anti-parallel switches is turned on, charging the capacitor from the phase line in reverse, forming a symmetrical current path. This structure ensures that regardless of the voltage polarity change, the capacitor can complete charging and discharging within both half-cycles, with a strictly symmetrical current waveform, resulting in a stable and symmetrical effective value of the three-phase line current. Simultaneously, the three-phase circuit as a whole adopts an identical symmetrical topology, ensuring that the charging and discharging behavior of each phase capacitor is highly consistent in time, amplitude, and phase, guaranteeing that the injected capacitive current is a strictly three-phase symmetrical reactive current. This not only improves de-icing efficiency but also maintains system voltage stability and alleviates line voltage drop. This symmetrical design also simplifies the control logic, allowing the controller to synchronously regulate the three phases with a single unified command, eliminating the need for complex phase compensation. This improves system reliability and engineering practicality, and is the core technical feature for achieving "uninterrupted power supply, interference-free, and self-balancing" ice melting.

[0051] Based on the above optional embodiments, a control method for an uninterrupted de-icing device is proposed. Figure 5This is a schematic diagram of the control logic of an ice-melting device according to an optional embodiment of the present invention, such as... Figure 5 As shown, the control process mainly consists of the following steps:

[0052] Based on the additional de-icing current required for the de-icing scenario, the adjustable capacitor value is symmetrically adjusted to the minimum or estimated level. The capacitor value is designed as follows: Increasing the capacitor C value increases the capacitor's charging capacity, correspondingly increasing the effective value of the charging current and thus the total line current. The device is installed in a 10kV or other voltage level distribution network. The access voltage scenario is determined, and the specific adjustable capacitor value level is designed based on the charging current values ​​of different capacitor models from different manufacturers and the current values ​​of commonly used de-icing equipment in distribution networks at different voltage levels, according to experimental data and de-icing current standards. Figure 6 This is a schematic diagram of the effective charging current values ​​corresponding to adjustable capacitors 150uf and 190uf according to an optional embodiment of the present invention, as shown in the figure. Figure 6 As shown, for a 10kV distribution network, based on operation and maintenance experience, generating an additional 200A of de-icing current can meet the needs of most scenarios. For a certain type of capacitor, the effective value of the steady-state charging current is 200A when using 150uf and 250A when using 190uf. Multiple adjustable capacitor levels are designed according to actual needs.

[0053] After selecting the adjustable capacitor value, control the opening and closing of the capacitor charging and discharging circuits for each phase as follows to generate current for the de-icing equipment and increase the line current. Taking the positive half-cycle of phase A voltage as an example, the charging circuit is turned on at the beginning of the positive half-cycle, and the capacitor charges. When the capacitor charging current reaches zero, charging ends, and the power electronic switch of the charging circuit is locked. Simultaneously, the power electronic switch of the discharging circuit is turned on, allowing the capacitor to fully discharge to ground, meeting the requirements of generating a large current for de-icing in the next cycle. After the current stabilizes, record the effective value of the line current and the waveform of the current generated by the equipment. Figure 7 This is a schematic diagram of an adjustable capacitor charging current waveform provided by an optional embodiment of the present invention, such as... Figure 7 As shown, an example of the current waveform generated by the device can be seen.

[0054] Because the voltage at the de-icing equipment connection point is affected by factors such as line length and the magnitude of the original line load current, the actual current generated by the de-icing equipment will deviate from the design current during connection. Furthermore, there is a phase angle difference between the de-icing current and the load current of the line after the connection point, resulting in a combined line current value that may be lower than the expected de-icing current. When the effective value of the line current is less than the minimum de-icing current, the equipment is locked, and the adjustable capacitor value is adjusted to a higher level, increasing the capacitor C value to increase the charging current and thus the total current of the distribution line. The capacitor C value is increased step by step until the total current of the distribution line exceeds the minimum de-icing current value.

[0055] When the steady-state de-icing current of the line is greater than the minimum de-icing current but exceeds the line's current capacity (or when a specific line current value is required), adjust the charging circuit closing time based on the steady-state waveform of the charging current. Reduce the charging time in Xms increments, and control the power electronic switch of the charging circuit to close at a specific time point. This reduces the effective value of the charging current and the effective value of the distribution line current to meet the application current requirements. After setting the adjustable capacitor value and the opening and closing time of the charging circuit, continue the de-icing operation. After completing the operation, disconnect the circuit breaker and use the insulated operating rod to remove the line connection hardware while it is energized. Remove the equipment grounding to complete the de-icing operation.

[0056] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0057] Through the above description of the embodiments, those skilled in the art can clearly understand that the line de-icing method for power distribution networks according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0058] According to an embodiment of the present invention, a line de-icing device without power interruption is also provided, comprising: a controller for executing any of the above-described line de-icing methods for distribution networks; a capacitor charging and discharging circuit for receiving control from the controller and performing charging and discharging operations on an adjustable capacitor; a line connection module for connecting the capacitor charging and discharging circuit to multiple phases of the target distribution network; and a voltage and current acquisition module for acquiring current and voltage data of the multiple phases of the line and transmitting them to the controller.

[0059] This uninterrupted ice-melting device consists of four core modules working together to achieve intelligent, safe, and uninterrupted ice-melting control of the distribution network. The controller, as the system's central hub, receives real-time feedback of three-phase voltage and line current data from the voltage and current acquisition module. Based on preset ice-melting thresholds and safety constraints, it dynamically determines the target capacitor value and charging duration, and outputs precise timing commands to control the capacitor charging and discharging circuit. The capacitor charging and discharging circuit consists of three symmetrical power electronic circuits, each phase containing anti-parallel charging and discharging branches. Under the controller's control, it periodically charges and completely discharges the adjustable capacitor within the positive and negative half-cycles of the voltage, actively injecting controllable capacitive reactive current to increase the effective value of the total line current for thermal ice melting, eliminating the need for an external power supply. The line connection module uses insulated operating rods and live-line working fittings, in conjunction with a protective circuit breaker, to safely and quickly connect the device in parallel to the exposed grounding points of each phase of the target distribution network, achieving "plug-and-play" field deployment. The voltage and current acquisition module is located at the back end of the circuit breaker. It synchronously samples the three-phase voltage waveforms and capacitor charging and discharging currents with high precision and uploads the data to the controller in real time, providing data support for closed-loop regulation. The four modules work closely together: the acquisition module senses the grid status, the controller makes intelligent decisions, the capacitor circuit executes precisely, and the connection module connects safely. Together, they form an intelligent ice-melting system that requires no power outages, no external power supply, is three-phase symmetrical, and adaptively adjusts, significantly improving the power supply reliability and emergency response capability of the distribution network during ice storms.

[0060] For example, Figure 8 This is a topology diagram of a circuit-uninterrupted de-icing device for a controllable charging and discharging capacitor provided by an optional embodiment of the present invention, as shown below. Figure 8 As shown, the optional uninterrupted power line de-icing device includes an uninterrupted power line connection device, a voltage and current acquisition device, and a power electronic device for controllable capacitor charging and discharging.

[0061] The uninterruptible power line connection device includes line connection hardware, a protective circuit breaker, and connecting conductors (conductor connection hardware, circuit breaker, and power electronic device for controlled capacitor charging and discharging). During winter icing, an insulated operating rod is used to connect the line connection hardware to the line grounding ring (or other exposed parts of the line) using live operation, connecting the power grid to the downstream de-icing device. The circuit breaker located between the connection hardware and the power electronic device for controlled capacitor charging and discharging protects the de-icing equipment, disconnecting it in case of abnormal short circuits or other faults. A voltage and current acquisition device is installed at the circuit breaker to collect the three-phase voltage of the power grid and the charging current of each phase capacitor. The collected data is transmitted to the power electronic device for controlled capacitor charging and discharging.

[0062] The controllable capacitor charging and discharging power electronic device includes a bidirectional controllable capacitor section and a control section. The bidirectional controllable capacitor section is the primary part of the device. It receives control commands from the controller, adjusts the value of the adjustable capacitor C, and charges and discharges according to the controller commands after the capacitor value is adjusted. The main circuit of the power electronic device consists of three identical power electronic circuits, symmetrically connected to the three phases of the power grid. Each phase consists of an adjustable capacitor and a charging and discharging power electronic switch circuit. To ensure that the capacitor can be charged during the positive and negative half-cycles of voltage, each phase's adjustable capacitor and charging and discharging power electronic switch circuit are formally symmetrical, but the power electronic switches are reversed, forming two symmetrical circuits. The control section receives data from the voltage and current acquisition device, adjusts the adjustable capacitor value, and controls the orderly charging and discharging of the bidirectional controllable capacitor section, thereby generating a controllable periodic and symmetrical load (charging) current, which symmetrically increases the effective value of the line current for de-icing operations.

[0063] The de-icing device is transported by vehicle to the de-icing point during power grid icing. Using an insulated operating rod under energized conditions, the line connection hardware is connected to the line grounding ring (or other exposed line parts), thus connecting the power grid to the de-icing device. The de-icing device is then grounded, and the circuit breaker is closed to energize the equipment. After energization, de-icing operations are controlled according to the minimum de-icing current standard.

[0064] According to embodiments of the present invention, an apparatus for implementing the above-described method for de-icing lines in a power distribution network is also provided. Figure 9 This is a structural block diagram of a line de-icing device for a power distribution network provided according to an embodiment of the present invention, such as... Figure 9 As shown, the device includes a first determining module 91, a second determining module 92, and a control module 93. The device will be described below.

[0065] The first determining module 91 is used to determine the initial capacitance value of the adjustable capacitor and adjust the actual capacitance value of the adjustable capacitor to the initial capacitance value. The adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network.

[0066] The second determining module 92, connected to the first determining module 91, is used to perform charging and discharging operations on the adjustable capacitor based on the initial capacitance value, and to determine the target capacitance value and the target charging end time of the adjustable capacitor.

[0067] The control module 93, connected to the second determining module 92, is used to control multiple capacitor charging and discharging circuits based on the target capacitance value and the target charging end time to melt ice on multiple phase lines.

[0068] It should be noted that the first determining module 91, the second determining module 92, and the control module 93 mentioned above correspond to steps S201 to S203 in the embodiments. Multiple modules implement the same instances and application scenarios as their corresponding steps, but are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of the device, can run in the computer terminal 10 provided in the embodiments.

[0069] Embodiments of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0070] The memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the line de-icing method and device for power distribution networks in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, thereby realizing the aforementioned line de-icing method for power distribution networks. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0071] The processor can access information and application programs stored in memory via a transmission device to perform the following steps: determining the initial capacitance value of the adjustable capacitor and adjusting the actual capacitance value of the adjustable capacitor to the initial capacitance value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network; performing charging and discharging operations on the adjustable capacitor based on the initial capacitance value to determine the target capacitance value and the target charging end time of the adjustable capacitor; and controlling the multiple capacitor charging and discharging circuits respectively to melt ice on the lines of multiple phases based on the target capacitance value and the target charging end time.

[0072] Optionally, the processor may also execute program code with the following steps: Based on the initial capacitance value, perform charging and discharging operations on the adjustable capacitor to determine the target capacitance value and target charging end time of the adjustable capacitor, including: starting the charging circuit in the multiple capacitor charging and discharging circuits respectively when the voltage preset cycle of each of the multiple phases of the line begins; turning off the charging circuit in the multiple capacitor charging and discharging circuits respectively and turning on the discharging circuit in the multiple capacitor charging and discharging circuits respectively when the charging current of the adjustable capacitor is less than a preset current threshold, and recording the initial charging end time; recording the effective current value of each of the multiple phases of the line until the current fluctuation range of the multiple phases of the line is less than a preset fluctuation threshold; determining whether the effective current value of each of the multiple phases of the line is greater than a preset de-icing current threshold when the effective current value of each of the multiple phases of the line is greater than a line current carrying threshold when the effective current value of each of the multiple phases of the line is not greater than a line current carrying threshold when the initial capacitance value is taken as the target capacitance value and the initial charging end time is taken as the target charging end time.

[0073] Optionally, the processor may also execute program code with the following steps: when the effective current value of each of the multiple phase lines is not greater than the preset de-icing current threshold, gradually increase the initial capacitance value, repeat the charging and discharging process of multiple capacitor charging and discharging circuits until the effective current value of each of the multiple phase lines is greater than the preset de-icing current threshold, and use the increased initial capacitance value as the target capacitance value.

[0074] Optionally, the processor may also execute program code with the following steps: when the effective value of the current in each of the multiple phases is greater than the line current carrying threshold, gradually reduce the initial charging end time, repeat the charging and discharging process of multiple capacitor charging and discharging circuits, until the effective value of the current in each of the multiple phases is not greater than the line current carrying threshold, and use the reduced initial charging end time as the target charging end time.

[0075] Optionally, the processor can also execute program code for the following steps: the capacitor charging and discharging circuit has a symmetrical structure.

[0076] This invention provides a method for de-icing lines in a power distribution network. By determining the initial capacitance value of an adjustable capacitor and adjusting its actual capacitance value to the initial value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits connected to multiple phases of the target power distribution network; based on the initial capacitance value, charging and discharging operations are performed on the adjustable capacitor to determine the target capacitance value and the target charging end time; based on the target capacitance value and the target charging end time, the multiple capacitor charging and discharging circuits are controlled to de-ic the lines of multiple phases, achieving uniform and efficient de-icing. This achieves the technical effect of synchronous, precise, and safe de-icing of multi-phase lines without power interruption, thus solving the technical problem that current thermal de-icing technologies require interrupting power supply to the lines and relying on external DC or AC power to create a short-circuit current to heat and melt the conductors.

[0077] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a non-volatile storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0078] Embodiments of the present invention also provide a non-volatile storage medium. Optionally, in this embodiment, the aforementioned non-volatile storage medium can be used to store the program code executed by the line de-icing method for power distribution networks provided in the above embodiments.

[0079] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0080] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: determining the initial capacitance value of the adjustable capacitor and adjusting the actual capacitance value of the adjustable capacitor to the initial capacitance value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network; performing charging and discharging operations on the adjustable capacitor based on the initial capacitance value, and determining the target capacitance value and target charging end time of the adjustable capacitor; and controlling the multiple capacitor charging and discharging circuits respectively to melt ice on the lines of multiple phases based on the target capacitance value and target charging end time.

[0081] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: based on the initial capacitance value, performing charging and discharging operations on the adjustable capacitor, determining the target capacitance value and the target charging end time of the adjustable capacitor, including: when the voltage preset cycle of each of the multiple phase lines begins, turning on the charging circuit in the multiple capacitor charging and discharging circuits respectively; when the charging current of the adjustable capacitor is less than a preset current threshold, turning off the charging circuit in the multiple capacitor charging and discharging circuits respectively, turning on the discharging circuit in the multiple capacitor charging and discharging circuits respectively, and recording the initial charging end time; until the current fluctuation range of the multiple phase lines is less than a preset fluctuation threshold, recording the effective current value of each of the multiple phase lines; when the effective current value of each of the multiple phase lines is greater than a preset de-icing current threshold, determining whether the effective current value of each of the multiple phase lines is greater than the line current bearing threshold; when the effective current value of each of the multiple phase lines is not greater than the line current bearing threshold, taking the initial capacitance value as the target capacitance value and the initial charging end time as the target charging end time.

[0082] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: when the effective current value of each of the multiple phase lines is not greater than the preset de-icing current threshold, gradually increase the initial capacitance value, repeat the charging and discharging process of multiple capacitor charging and discharging circuits, until the effective current value of each of the multiple phase lines is greater than the preset de-icing current threshold, and use the increased initial capacitance value as the target capacitance value.

[0083] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: when the effective value of the current of each of the multiple phase lines is greater than the line current carrying threshold, gradually reduce the initial charging end time, repeat the charging and discharging process of multiple capacitor charging and discharging circuits, until the effective value of the current of each of the multiple phase lines is not greater than the line current carrying threshold, and take the reduced initial charging end time as the target charging end time.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: the capacitor charging and discharging circuit has a symmetrical structure.

[0085] Embodiments of the present invention also provide a computer program product, including a computer program. Optionally, in this embodiment, when the computer program is executed by a processor, it can: determine the initial capacitance value of an adjustable capacitor and adjust the actual capacitance value of the adjustable capacitor to the initial capacitance value, wherein the adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network; based on the initial capacitance value, perform charging and discharging operations on the adjustable capacitor to determine the target capacitance value and the target charging end time of the adjustable capacitor; based on the target capacitance value and the target charging end time, control the multiple capacitor charging and discharging circuits respectively to melt ice on the lines of multiple phases.

[0086] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0087] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0092] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for de-icing power lines in a power distribution network, characterized in that, include: The initial capacitance value of the adjustable capacitor is determined and the actual capacitance value of the adjustable capacitor is adjusted to the initial capacitance value. The adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network. Based on the initial capacitance value, the adjustable capacitor is charged and discharged to determine the target capacitance value and the target charging end time. Based on the target capacitance value and the target charging end time, the multiple capacitor charging and discharging circuits are controlled respectively to melt ice on the multiple phase lines.

2. The method according to claim 1, characterized in that, The step of performing charge and discharge operations on the adjustable capacitor based on the initial capacitance value, and determining the target capacitance value and target charging end time of the adjustable capacitor, includes: When the preset voltage cycle of each of the multiple phases of the line begins, the charging circuit in each of the multiple capacitor charging and discharging circuits is turned on. When the charging current of the adjustable capacitor is less than a preset current threshold, the charging circuit in the plurality of capacitor charging and discharging circuits is turned off, the discharging circuit in the plurality of capacitor charging and discharging circuits is turned on, and the initial charging end time is recorded. Until the current fluctuation range of the multiple phases of the line is less than the preset fluctuation threshold, the effective current value of each of the multiple phases of the line is recorded. If the effective value of the current of each of the multiple phases of the line is greater than the preset de-icing current threshold, determine whether the effective value of the current of each of the multiple phases of the line is greater than the line current bearing threshold. If the effective value of the current in each of the multiple phases is not greater than the current carrying threshold of the line, the initial capacitance value is taken as the target capacitance value, and the initial charging end time is taken as the target charging end time.

3. The method according to claim 2, characterized in that, Also includes: If the effective current value of each of the multiple phases is not greater than the preset de-icing current threshold, the initial capacitance value is gradually increased, and the charging and discharging process of the multiple capacitor charging and discharging circuits is repeated until the effective current value of each of the multiple phases is greater than the preset de-icing current threshold. The increased initial capacitance value is then used as the target capacitance value.

4. The method according to claim 2, characterized in that, Also includes: If the effective value of the current in each of the multiple phases is greater than the current carrying threshold of the line, the initial charging end time is gradually reduced, and the charging and discharging process of the multiple capacitor charging and discharging circuits is repeated until the effective value of the current in each of the multiple phases is not greater than the current carrying threshold of the line. The reduced initial charging end time is then taken as the target charging end time.

5. The method according to claim 1, characterized in that, The capacitor charging and discharging circuit has a symmetrical structure.

6. A power-on de-icing device for power lines, characterized in that, include: A controller for performing the line de-icing method for a power distribution network as described in any one of claims 1 to 5; A capacitor charging and discharging circuit is used to receive control from the controller and perform charging and discharging operations on the adjustable capacitor. A line connection module is used to connect the capacitor charging and discharging circuit to the lines of multiple phases of the target power distribution network; The voltage and current acquisition module is used to acquire the current and voltage data of the multiple phases of the line and transmit them to the controller.

7. A line de-icing device for power distribution networks, characterized in that, include: The first determining module is used to determine the initial capacitance value of the adjustable capacitor and adjust the actual capacitance value of the adjustable capacitor to the initial capacitance value. The adjustable capacitor is located in multiple capacitor charging and discharging circuits, and the multiple capacitor charging and discharging circuits are respectively connected to the lines of multiple phases of the target distribution network. The second determining module is used to perform charging and discharging operations on the adjustable capacitor based on the initial capacitance value, and determine the target capacitance value and target charging end time of the adjustable capacitor. The control module is used to control the multiple capacitor charging and discharging circuits respectively based on the target capacitance value and the target charging end time to melt ice on the multiple phase lines.

8. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the non-volatile storage medium to perform the line de-icing method for a power distribution network as described in any one of claims 1 to 5.

9. A computer device, characterized in that, include: Memory and processor The memory stores computer programs; The processor is configured to execute a computer program stored in the memory, wherein when the computer program is executed, the processor performs the line de-icing method for a power distribution network as described in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the line de-icing method for power distribution networks as described in any one of claims 1 to 5.

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