Line de-icing method, device, apparatus and non-transitory storage medium

Abstract

The application discloses a line ice melting method, device, apparatus and nonvolatile storage medium. The method comprises the following steps: acquiring three-phase voltages and a line total current on both sides of an access point in a power distribution network, wherein the access point is an access point of a line ice melting device and a two-phase operation line in the power distribution network; calculating inter-phase loop voltages based on the three-phase voltages; calculating an initial impedance module value corresponding to an adjustable RC load device in the line ice melting device based on a preset target ice melting current value, the line total current and the inter-phase loop voltages; and generating a loop current based on the initial impedance module value, wherein the loop current is used for ice melting of the two-phase operation line in the power distribution network. The application solves the technical problem that the power distribution network cannot autonomously generate a large current sufficient for ice melting in an operation state, current thermal ice melting needs to interrupt power transmission, and an additional AC-DC power supply is needed for thermal ice melting, thereby affecting normal operation of the power distribution network and response lag.

Description

Technical Field

[0001] This invention relates to the field of power system de-icing, and more specifically, to a method, equipment, apparatus, and non-volatile storage medium for line de-icing. Background Technology

[0002] Ice storms are frequent natural disasters affecting power systems, easily causing large-scale and prolonged outages of transmission and distribution lines, seriously threatening the safety and stability of the power grid, and causing significant economic losses and social impacts. Currently, the mainstream method for de-icing distribution networks is thermal de-icing, which involves artificially creating a short-circuit loop and connecting an external DC or AC power source to generate Joule heat through a large current in the iced conductors, thus melting the ice. Typical equipment includes mobile, segmented, pickup truck-mounted, and low-voltage extended de-icing devices. In addition, mechanical de-icing relies on manual pole climbing and knocking, which is high-risk and inefficient; natural de-icing and anti-icing coatings can only help slow down icing, with limited effectiveness.

[0003] All of the aforementioned traditional methods require a forced power outage before de-icing. Existing thermal de-icing methods rely on external power supply equipment to create short-circuit paths, which not only leads to power outages and fails to meet the high-reliability power supply needs of critical users and urban core areas, but also makes rapid deployment at the end of the distribution network or in remote areas difficult due to complex equipment transportation, wiring, safety distance restrictions, and scheduling and coordination difficulties, significantly increasing energy consumption and operation and maintenance costs. Furthermore, neither mechanical nor natural methods possess the capability for proactive, efficient, and safe online de-icing.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This invention provides a method, device, apparatus, and non-volatile storage medium for line de-icing, to at least solve the technical problem that current thermal de-icing requires interrupting power transmission and adding AC / DC power supplies to perform thermal de-icing because the distribution network cannot generate a large current sufficient for de-icing during operation, thus affecting the normal operation of the distribution network and causing response delays.

[0006] According to one aspect of the present invention, a method for de-icing a power line is provided, comprising: acquiring the three-phase voltage and the total line current on both sides of a connection point in a power distribution network, wherein the connection point is the connection point between a de-icing device and a two-phase operating line in the power distribution network; calculating the phase-to-phase closed-loop voltage based on the three-phase voltage; calculating the initial impedance modulus of an adjustable RC load device in the de-icing device based on a preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage; and generating a closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used for de-icing the two-phase operating line in the power distribution network.

[0007] Optionally, based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage, the initial impedance modulus of the adjustable RC load device is calculated, including: determining the required minimum closed-loop current based on the target de-icing current value and the total line current; and calculating the initial impedance modulus based on the phase-to-phase closed-loop voltage and the required minimum closed-loop current according to a preset formula.

[0008] Optionally, after injecting the loop current, continue to monitor the current three-phase voltage and total line current at the access point; determine the current interphase loop voltage based on the current three-phase voltage; and reduce the impedance modulus corresponding to the adjustable RC load device if the current interphase loop voltage changes and the total line current is less than the target de-icing current value.

[0009] Optionally, after injecting the loop current, the current three-phase voltage and total line current at the connection point are monitored; based on the current three-phase voltage, the current line end phase voltage value is determined; if the current line end phase voltage value is detected to be lower than the preset voltage threshold and the total line current is not lower than the target de-icing current value, the ratio of capacitive reactance to resistance in the adjustable RC load device is increased.

[0010] According to another aspect of the present invention, a line de-icing device is also provided, comprising: an uninterrupted power line connection device for making a non-power-outage mechanical connection with a two-phase operating line in a distribution network via line connection hardware; a voltage and current acquisition device for acquiring the magnitude of the three-phase voltage and the closed-loop current on both sides of the access point in the distribution network, wherein the access point is the connection point between the uninterrupted power line connection device and the two-phase operating line in the distribution network; and an adjustable RC load device for calculating the phase-to-phase closed-loop voltage based on the three-phase voltage, and calculating the initial impedance modulus value corresponding to the adjustable RC load device based on a preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage, and then forming a closed-loop current based on the initial impedance modulus value, wherein the closed-loop current is used for de-icing the two-phase operating line in the distribution network.

[0011] Optionally, the adjustable RC load device includes an adjustable RC load unit and a control unit. The control unit is used to receive the closed-loop current collected by the voltage and current acquisition device and the total line current collected by the line head-end communication. Based on the three-phase voltage, it calculates the phase-to-phase closed-loop voltage and, based on the preset target de-icing current value, closed-loop current, total line current, and phase-to-phase closed-loop voltage, calculates the impedance modulus value corresponding to the adjustable RC load device and generates control commands based on the impedance modulus value. The adjustable RC load unit is used to receive the control commands and adjust the impedance based on the control commands.

[0012] According to another aspect of the present invention, a line de-icing device is also provided, comprising: an acquisition module for acquiring three-phase voltages and total line current on both sides of an access point in a distribution network, wherein the access point is the connection point between the line de-icing device and a two-phase operating line in the distribution network; a first calculation module for calculating the interphase closed-loop voltage based on the three-phase voltage; a second calculation module for calculating the initial impedance modulus of the adjustable RC load device in the line de-icing device based on a preset target de-icing current value, the total line current, and the interphase closed-loop voltage; and a generation module for generating a closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used for de-icing the two-phase operating line in the distribution network.

[0013] 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.

[0014] According to another aspect of the present invention, a computer device is also provided, the computer device including a processor for running a program, wherein the program executes any of the above-described line de-icing methods when it runs.

[0015] 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.

[0016] In this embodiment of the invention, a line de-icing method is adopted. By connecting an adjustable RC load in series between two phases of the distribution network, the phase-to-phase voltage difference is used to drive the formation of a loop current in the RC network. This achieves the purpose of vector superposition of the current with the original load current, thereby realizing the technical effect of directly increasing the effective value of the total current of the iced line to meet the de-icing thermal demand without interrupting power supply or relying on external power sources. This solves the technical problem that the current thermal de-icing method requires interrupting power transmission and adding AC / DC power sources for thermal de-icing because the distribution network cannot generate a large current sufficient for de-icing under normal operating conditions, which affects the normal operation of the distribution network and causes response delays. Attached Figure Description

[0017] 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:

[0018] Figure 1 A hardware structure block diagram of a computer terminal for implementing a line de-icing method is shown.

[0019] Figure 2This is a schematic flowchart of a line de-icing method provided according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of voltage-current relationship provided by an optional embodiment of the present invention;

[0021] Figure 4 This is a topology diagram of an uninterrupted ice-melting device utilizing cross-connection of lines, provided by an optional embodiment of the present invention.

[0022] Figure 5 This is a structural block diagram of an ice-melting device provided according to an embodiment of the present invention. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] First, some nouns or terms that appear in the description of the embodiments of this application shall be interpreted as follows:

[0026] The loop current refers to the loop current component that is naturally formed by the cross-interconnection structure after the device of the present invention is connected, due to the phase voltage difference between the two operating lines. This current flows through the ice-covered conductor and is superimposed on the original load current, forming a heat source for melting ice. Its amplitude and phase are determined by the impedance of the connected RC load and are not current injected by artificial short circuit or external power source.

[0027] According to an embodiment of the present invention, a method embodiment for de-icing a power line 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.

[0028] The methods and embodiments provided in this application can be executed on mobile terminals, computer terminals, or similar computing devices. Figure 1 A hardware block diagram of a computer terminal for implementing a line de-icing method 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.

[0029] 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).

[0030] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the line de-icing method 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 line de-icing method of the aforementioned application. 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.

[0031] 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.

[0032] Figure 2 This is a schematic flowchart of a line de-icing method provided according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes the following steps:

[0033] Step S202: Collect the three-phase voltage and total line current on both sides of the access point in the distribution network. The access point is the connection point between the line de-icing equipment and the two-phase operating line in the distribution network.

[0034] In this step, the three-phase voltage and total line current on both sides of the access point in the distribution network are collected. The access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network. The purpose is to obtain the basic state parameters of the power grid operation necessary to construct the loop current, so as to provide real and high-precision input data for subsequent impedance calculation. In specific implementation, the de-icing device is connected to the distribution network through an insulated operating rod. The connecting hardware at both ends of the device is connected to the grounding ring or exposed conductor of the two-phase operating line, forming two access points A1, B1, C1 and A2, B2, C2. A, B, and C represent the three-phase conductors of the distribution network, and A1 and A2 are two conductor access points of the same phase at different locations. Similarly, B1 and B2, C1 and C2 are connected at the same location. Under normal operating conditions, due to uneven load distribution, line impedance differences and phase shifts, there are stable phase-to-phase voltage differences between A1 and B2, between B1 and C2, and between C1 and A2. This voltage difference is the physical basis for realizing the loop current in this invention.

[0035] To accurately capture this voltage difference, the device is equipped with 0.2-class voltage transformers and 0.2S-class current transformers at terminals A1, B1, and C1, and terminals A2, B2, and C2, respectively. The sampling frequency is no less than 10kHz, and the synchronization error is controlled within 5μs. A unified clock reference is provided by a GPS / PPS timing system to ensure complete synchronization of the sampling of the six voltage channels and the one load current channel. The instantaneous waveforms acquired are converted by a 16-bit high-precision ADC, and the control unit uses a Fast Fourier Transform (FFT) algorithm to extract the amplitude and phase of each phase voltage and current, forming a complex vector representation. At the same time, the total current vector of the feeder is obtained from the substation automation system via 4G or PLC communication. This current is the total current of the system at this node before the de-icing device is connected, i.e., the natural load current. Its phase is determined by the power factor of the power grid, usually in the 0.9~1.0 lag range. This data is not a local estimate or historical value, but real-time, synchronous, and precise operating data from the power grid dispatch center, ensuring the reliability of subsequent calculations.

[0036] The above steps, through high-precision, high-synchronization, and full-phasor acquisition, transform the originally vague concept of "line voltage" into a complex vector with precise amplitude and phase, providing a mathematical basis for subsequent accurate calculation of loop voltage and impedance.

[0037] Step S204: Calculate the phase-to-phase loop voltage based on the three-phase voltage.

[0038] In this embodiment, the interphase loop voltage is calculated based on the three-phase voltage. By obtaining the voltage difference between any two phases in the three-phase system and utilizing the amplitude and phase relationship of the voltage vector, the interphase potential difference formed at the crossover point can be derived. This potential difference is the fundamental driving force for the loop current. This calculation process relies only on the measured vector data of the three-phase voltage, without introducing external power sources or artificial short-circuit conditions. The result directly determines the potential amplitude boundary of the loop current, providing a basic voltage basis for subsequent regulation of the loop current through RC load.

[0039] In this step, the potential difference that will drive the loop current after the RC load is connected is determined by using the three-phase voltage vectors collected on both sides of the access point. This voltage is not a normal phase-to-phase voltage, but a "bridging potential difference" across different nodes of the two phases. The result directly determines the theoretical maximum driving capability of the loop current, providing a basis for electrical parameters to be used to adjust the RC impedance to match the ice-melting current requirements.

[0040] Step S206: Based on the preset target de-icing current value, the total line current and the phase-to-phase loop voltage, calculate the initial impedance modulus of the adjustable RC load device in the line de-icing equipment.

[0041] In this step, based on the preset target de-icing current value, combined with the total line current and the phase-to-phase closed-loop voltage, the initial impedance modulus required for the adjustable RC load device is calculated. The target de-icing current value serves as the minimum current reference for de-icing operations and is the starting point for the calculation; the total line load current reflects the original current state of the power grid before the de-icing equipment is connected; and the phase-to-phase closed-loop voltage is determined by the voltage vector difference between the two sides of the grid at the connection point, constituting the driving voltage source for the closed-loop current. Without introducing other variables or external power sources, based solely on these three known quantities, the RC load impedance modulus necessary to achieve the target de-icing current is derived through a circuit model. This impedance modulus directly relates to the magnitude of the closed-loop current and serves as the initial quantitative basis for controlling the de-icing current to reach the expected level.

[0042] To ensure stability and safety during initial commissioning, the initial control strategy sets the RC load device to operate in pure resistive mode, meaning the capacitive component is set to zero, and the impedance magnitude is solely borne by the resistive component. This avoids phase shifts, voltage rises, or system oscillations caused by capacitive current. After quantization, the impedance magnitude calculation result is matched to the closest standard value in the adjustable resistance range sequence, completing the impedance switching.

[0043] Specifically, after the de-icing equipment is connected, the total line current equals the vector sum of the load current and the loop current (the magnitude of the de-icing current is the current magnitude). The loop current magnitude is equal to the ratio of the phase voltage magnitude (obtained from the line voltage vectors on both sides of the equipment connection point) to the RC impedance magnitude. Combining the above information with the required de-icing current value for the line (which can be found in power standards), the initial impedance magnitude corresponding to the adjustable RC load device is calculated. Taking the interconnection method of A1B2, B1C2, and C1A2, and the calculation of the de-icing current value for line A1 as an example, the calculation is performed. Figure 3 This is a schematic diagram of voltage and current relationship provided by an optional embodiment of the present invention, such as... Figure 3 As shown. The voltage vector of phase A of substation 1. With the angle reference point 0, the power factor of the power grid is 0.9-1, therefore the total load current of line 1 is... Lagging phase A voltage of substation The voltage drop and angle change at the beginning and end of a 10kV line are very small, therefore the phase-to-phase voltage at the connection point is relatively stable. Advanced angle At approximately 30°, the loop current of path A1B2 can be observed. The angle is due to the RC load. Angle and Angle +90° range. Total current vector of the line after the de-icing equipment is connected. The current magnitude can be seen from the figure. It can be seen that in the same modulus value Down, The smaller the value, the smaller the total line current. That is, under the same modulus condition, a pure R load generates the largest current, a pure C load generates the smallest line current, and the total line current modulus of a load with the same modulus falls within this range. Combining the expected line de-icing current value and the adjustable RC load setting, calculate the expected RC value for initial connection. Initial connection should preferably be with a pure R load to avoid large inrush currents while ensuring a sufficiently large total line current modulus. Since the moduli of the three-phase currents on the same side are equal, the method for calculating the two currents is the same as described above.

[0044] Step S208: Based on the initial impedance modulus, generate a closed-loop current, wherein the closed-loop current is used to melt ice on two-phase operating lines in the distribution network.

[0045] In this step, a closed-loop current is generated based on the initial impedance modulus. This means that by setting a specific impedance value as a starting point, a closed current path is formed between two operating phases in the distribution network. This current is driven by the phase-to-phase voltage and generated through the impedance modulus. The function of this closed-loop current is to directly increase the effective value of the total current in the icing line, thereby utilizing the Joule heating effect of the conductor to achieve de-icing. This process does not require interruption of the original power transmission; it is triggered solely by the interaction between the inherent voltage difference of the line and the preset impedance modulus. The generated closed-loop current is a periodic and symmetrical current, the magnitude of which is directly determined by the initial impedance modulus. It does not depend on an external power source or artificial short-circuit operation; the current enhancement is achieved solely through impedance characteristic regulation to meet the minimum current threshold required for de-icing.

[0046] In this step, the control unit calculates the optimal impedance modulus based on the current operating parameters of the distribution network (such as phase-to-phase voltage, line impedance, icing thickness, and ambient temperature). This impedance is purely resistive or nearly purely resistive, with a typical value of 175Ω. The control unit then issues a command to drive the on-load tap changer to simultaneously engage three symmetrical branches in the three-phase RC load module: A1–B2, B1–C2, and C1–A2. Each branch consists of an adjustable resistor and an energy storage capacitor connected in series, with the RC circuit used to control the closed-loop current vector. Once the branch is engaged, the phase-to-phase potential difference (e.g., 10kV between A1 and B2) immediately drives current through the RC load to form a closed loop. This current path is independent of the original load current, flowing only through the iced conductor section and not through the user load, thus achieving "current path separation and concentrated energy release."

[0047] Through the above steps, the three-phase voltage and total line current on both sides of the distribution network access point are collected, the phase-to-phase loop voltage between two phases is calculated, and combined with the preset target de-icing current value and the current load current, the initial impedance modulus value required by the adjustable RC load device in the line de-icing equipment is calculated. Then, the loop current is actively constructed between the two phases of the distribution network using this impedance modulus value. This loop current is driven by the phase-to-phase voltage difference existing in the distribution network itself. Without interrupting the power supply or external power supply, it can maintain normal power transmission while enabling the line conductors to achieve efficient de-icing due to the current heating effect. This effectively overcomes the drawbacks of traditional thermal de-icing methods that require power outages and rely on external power sources. It realizes autonomous, safe, and controllable line de-icing operations without power interruption, significantly improving the operational resilience and emergency response capability of the distribution network in the context of ice and snow disasters.

[0048] As an optional embodiment, the initial impedance modulus of the adjustable RC load device is calculated based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage. This includes: determining the required minimum closed-loop current based on the target de-icing current value and the total line current; and calculating the initial impedance modulus based on the phase-to-phase closed-loop voltage and the required minimum closed-loop current according to a preset formula.

[0049] Optionally, by collecting the three-phase voltage and total line current on both sides of the distribution network access point, the phase-to-phase closed-loop voltage is calculated. Combined with the preset target de-icing current value and the total line current, the minimum closed-loop current necessary for effective de-icing is accurately separated, thus avoiding impedance setting deviation caused by directly using the target de-icing current value and ignoring the influence of the existing load current. Then, based on the minimum closed-loop current and the phase-to-phase closed-loop voltage, the initial impedance modulus of the adjustable RC load device is dynamically calculated according to the preset formula of Ohm's law relationship. This allows the device to accurately output the current that meets the minimum de-icing current threshold at the moment of closed-loop start-up, ensuring the reliability of the de-icing effect and effectively preventing overload risks caused by excessively low impedance or de-icing failure caused by excessively high impedance. Ultimately, adaptive intelligent de-icing without power outages or external power supply is achieved, significantly improving the operational safety and efficiency of the distribution network under icing conditions.

[0050] As an optional embodiment, after injecting the loop current, the current three-phase voltage and total line current at the access point are continuously monitored; based on the current three-phase voltage, the current interphase loop voltage is determined; if the current interphase loop voltage changes and the total line current is less than the target de-icing current value, the impedance modulus value corresponding to the adjustable RC load device is reduced.

[0051] Optionally, after injecting the loop current, the current three-phase voltage vector and total line current at the connection point are continuously monitored, and the current phase-to-phase loop voltage is calculated in real time accordingly. When a change in the phase-to-phase loop voltage is detected, and the total line current is less than the target de-icing current value (i.e., the minimum de-icing current) due to changes in line voltage drop, the impedance modulus of the adjustable RC load device is automatically reduced by a fixed step size. This improves the current output capability in the loop, ensuring that the loop current is stably maintained at the preset target de-icing current value. This achieves adaptive continuous de-icing without power outages or external power supplies, solving the problem of forced interruption in traditional methods due to voltage drops causing the de-icing current to fail to meet the target. It achieves the technical effect of automatically maintaining efficient de-icing under dynamic load conditions and improving de-icing reliability and automation.

[0052] As an optional embodiment, after injecting the loop current, the current three-phase voltage and total line current at the access point are continuously monitored; based on the current three-phase voltage, the current line end phase voltage value is determined; if the current line end phase voltage value is detected to be lower than the preset voltage threshold and the total line current is not lower than the target de-icing current value, the ratio of capacitive reactance to resistance in the adjustable RC load device is increased.

[0053] Optionally, during the de-icing operation by injecting loop current, the current three-phase voltage and total line current at the connection point are continuously monitored in real time. By collecting and analyzing the three-phase voltage, the system automatically calculates the voltage values ​​of each phase to ground at the end of the line, i.e., the current phase voltage value at the end of the line. When the system detects that the phase voltage value at the end is lower than the preset safe operating threshold, it indicates that the line has experienced a significant voltage drop due to increased current, which may affect the power supply quality of downstream users. However, if the total line current remains at a level not lower than the target de-icing current, it indicates that the current de-icing thermal effect is sufficient, and there is no need to further increase the total current. In this case, the control system does not adjust the total current magnitude but instead activates the voltage quality optimization mechanism: gradually increasing the ratio of capacitive to resistive components in the adjustable RC load device, i.e., increasing the ratio of capacitive reactance to resistance. By increasing capacitive reactive power compensation, the inherent inductive voltage drop of the line is offset, thereby raising the voltage level at the end of the line and restoring the power supply voltage to the normal range without reducing the de-icing current.

[0054] By utilizing the compensating effect of capacitive reactance on the inductive reactive power of the line, the voltage level at the end of the line is improved, effectively alleviating the voltage drop problem caused by the injection of loop current. This achieves synergistic optimization of de-icing efficiency and voltage quality, thereby solving the limitations of traditional de-icing methods that are forced to reduce the de-icing current or rely on external power sources to maintain voltage stability. The goal is to achieve the technical effect of completing line de-icing stably and efficiently under conditions of no power outage and no external power source, and ensuring the safe operation of the distribution network.

[0055] According to another aspect of the present invention, a line de-icing device is also provided. Figure 4 This is a topology diagram of an uninterrupted ice-melting device utilizing line cross-interconnection provided by an optional embodiment of the present invention, such as... Figure 4 As shown, it includes:

[0056] Uninterruptible power line connection device, used to make non-power-outage mechanical connection with two-phase operating lines in the power distribution network through line connection hardware.

[0057] The uninterruptible power line connection device includes line connection hardware, a protective circuit breaker, and connecting conductors (conductor connection hardware, circuit breaker, and adjustable RC load device). During winter icing, the 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, thus connecting the power grid to the downstream de-icing device. The circuit breaker located between the connection hardware and the adjustable RC load device protects the de-icing equipment, disconnecting it in case of abnormal short circuits or other faults.

[0058] The voltage and current acquisition device is used to acquire the magnitude of the three-phase voltage and the closed-loop current on both sides of the access point in the distribution network. The access point is the connection point between the uninterruptible line connection device and the two-phase operating line in the distribution network.

[0059] An adjustable RC load device is used to calculate the phase-to-phase closed-loop voltage based on the three-phase voltage, and to calculate the initial impedance modulus corresponding to the adjustable RC load device based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage. Then, based on the initial impedance modulus value, a closed-loop current is formed, which is used to de-ic the two-phase operating lines in the distribution network.

[0060] Optionally, the adjustable RC load device includes an adjustable RC load unit and a control unit. The control unit is used to receive the closed-loop current collected by the voltage and current acquisition device and the total line current collected by the line head-end communication. Based on the three-phase voltage, it calculates the phase-to-phase closed-loop voltage and, based on the preset target de-icing current value, closed-loop current, total line current, and phase-to-phase closed-loop voltage, calculates the impedance modulus value corresponding to the adjustable RC load device and generates control commands based on the impedance modulus value. The adjustable RC load unit is used to receive the control commands and adjust the impedance based on the control commands.

[0061] Specifically, the adjustable RC load device includes an adjustable RC load unit and a control unit. The adjustable RC load unit comprises a three-phase symmetrical series-connected adjustable RC load and the device's energy storage power supply. The series-connected adjustable RC load, in conjunction with an on-load tap changer (or other types of switches, such as power electronic switches), enables the connection of three-phase resistance, capacitance, and regulation. The control unit is a secondary device that receives information from voltage and current acquisition devices and communicates with information acquisition devices at substations and other locations to obtain information such as the total line current. Combining this with the total line current before de-icing, the voltage at the connection point, the expected minimum de-icing current, and comprehensively considering the grid voltage at the connection point, the control unit calculates, adjusts, and controls the connection of a specific amount of RC load for line cross-loop de-icing operations.

[0062] The adjustable RC load unit is part of the primary circuit of the device. It receives commands from the control unit and adjusts the connection impedance. Because the grid load and overhead line are essentially resistive-inductive, connecting a resistor creates a large resistive current, which further reduces the terminal voltage. By connecting a capacitor, the inductive reactive power is offset. Simultaneously, utilizing the capacitive effect, the terminal voltage is improved, enhancing the voltage quality at the line's end and ultimately achieving uninterrupted ice melting. The device's energy storage power supply uses batteries as its power source, providing power to the on-load tap changer and control components. The batteries are charged after the equipment is connected to the grid.

[0063] This equipment can be transported by vehicle to the de-icing point during power grid icing. It operates under energized conditions using an insulated operating rod, connecting the line connection hardware to the line grounding ring (or other exposed parts of the line), thus connecting the power grid to the equipment. This achieves the technical effect of reducing energy consumption by eliminating the need for an external power source. It utilizes the interconnection of different grid lines to create a large closed-loop voltage difference, and uses an adjustable RC load to control the closed-loop current to generate a controllable amount of periodic, symmetrical additional current in the distribution lines, thereby achieving the purpose of de-icing.

[0064] 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.

[0065] Through the above description of the embodiments, those skilled in the art can clearly understand that the line de-icing method according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platform. 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, 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.

[0066] According to an embodiment of the present invention, a line de-icing device for implementing the above-described line de-icing method is also provided. Figure 5 This is a structural block diagram of a line de-icing device provided according to an embodiment of the present invention, as shown below. Figure 5 As shown, the line de-icing device includes: an acquisition module 502, a first calculation module 504, a second calculation module 506, and a generation module 508. The line de-icing device will be described below.

[0067] The acquisition module 502 is used to acquire the three-phase voltage and total line current on both sides of the access point in the distribution network, wherein the access point is the connection point between the line de-icing equipment and the two-phase operating line in the distribution network.

[0068] The first calculation module 504 is connected to the acquisition module 502 and is used to calculate the phase-to-phase closed loop voltage based on the three-phase voltage.

[0069] The second calculation module 506, connected to the first calculation module 504, is used to calculate the initial impedance modulus of the adjustable RC load device in the line de-icing equipment based on the preset target de-icing current value, the total negative current of the line, and the phase-to-phase closed loop voltage.

[0070] The generation module 508, connected to the second calculation module 506, is used to generate a closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used to melt ice on two-phase operating lines in the distribution network.

[0071] It should be noted that the acquisition module 502, the first calculation module 504, the second calculation module 506, and the generation module 508 mentioned above correspond to steps S202 to S208 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 on the computer terminal 10 provided in the embodiments.

[0072] 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.

[0073] 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 apparatus 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. 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.

[0074] The processor can access the information and application program stored in the memory via the transmission device to perform the following steps: obtain the three-phase voltage and total line current on both sides of the access point in the distribution network, wherein the access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network; calculate the phase-to-phase closed-loop voltage based on the three-phase voltage; calculate the initial impedance modulus corresponding to the adjustable RC load device in the line de-icing device based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage; generate the closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used to de-ic the two-phase operating line in the distribution network.

[0075] Optionally, the processor may also execute program code for the following steps: calculating the initial impedance modulus of the adjustable RC load device based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage, including: determining the required minimum closed-loop current based on the target de-icing current value and the total line current; and calculating the initial impedance modulus based on the phase-to-phase closed-loop voltage and the required minimum closed-loop current according to a preset formula.

[0076] Optionally, the processor may also execute program code for the following steps: after injecting the loop current, continue to monitor the current three-phase voltage and total line current at the access point; determine the current interphase loop voltage based on the current three-phase voltage; and reduce the impedance modulus corresponding to the adjustable RC load device if the current interphase loop voltage changes and the total line current is less than the target de-icing current value.

[0077] Optionally, the processor may also execute program code for the following steps: after injecting the loop current, continue to monitor the current three-phase voltage and total line current at the connection point; determine the current line-end phase voltage value based on the current three-phase voltage; and increase the ratio of capacitive reactance to resistance in the adjustable RC load device when the current line-end phase voltage value is detected to be lower than the preset voltage threshold and the total line current is not lower than the target de-icing current value.

[0078] This invention provides a method for de-icing power lines. By connecting an adjustable RC load in series between two phases of the operating lines in the distribution network, the phase-to-phase voltage difference drives the formation of a loop current in the RC network. This achieves the goal of vector superposition of this current with the original load current, thereby directly increasing the effective value of the total current of the iced lines to meet the thermal demand for de-icing without interrupting power supply or relying on external power sources. This solves the technical problem that current thermal de-icing methods require interrupting power transmission and adding additional AC / DC power sources, which affects the normal operation of the distribution network and causes response delays because the distribution network cannot generate a large enough current for de-icing during operation.

[0079] 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.

[0080] 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 circuit de-icing method provided in the above embodiments.

[0081] 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.

[0082] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: obtaining the three-phase voltage and total line current on both sides of the access point in the distribution network, wherein the access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network; calculating the phase-to-phase closed-loop voltage based on the three-phase voltage; calculating the initial impedance modulus corresponding to the adjustable RC load device in the line de-icing device based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage; generating the closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used for de-icing the two-phase operating line in the distribution network.

[0083] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: calculating the initial impedance modulus of the adjustable RC load device based on a preset target de-icing current value, the total line current, and the phase-to-phase closing voltage, including: determining the required minimum closing current based on the target de-icing current value and the total line current; and calculating the initial impedance modulus according to a preset formula based on the phase-to-phase closing voltage and the required minimum closing current.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: after injecting the loop current, continue to monitor the current three-phase voltage and the total line current at the access point; determine the current interphase loop voltage based on the current three-phase voltage; and reduce the impedance modulus corresponding to the adjustable RC load device if the current interphase loop voltage changes and the total line current is less than the target de-icing current value.

[0085] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: after injecting the loop current, continue to monitor the current three-phase voltage and the total line current at the access point; determine the current line end phase voltage value based on the current three-phase voltage; and increase the ratio of capacitive reactance to resistance in the adjustable RC load device when the current line end phase voltage value is detected to be lower than a preset voltage threshold and the total line current is not lower than the target de-icing current value.

[0086] 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: acquire the three-phase voltage and total line current on both sides of the access point in the distribution network, wherein the access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network; calculate the phase-to-phase closed-loop voltage based on the three-phase voltage; calculate the initial impedance modulus corresponding to the adjustable RC load device in the line de-icing device based on the preset target de-icing current value, the total line current, and the phase-to-phase closed-loop voltage; and generate a closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used for de-icing the two-phase operating line in the distribution network.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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, characterized in that, include: The three-phase voltage and total line current on both sides of the access point in the distribution network are obtained, wherein the access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network; Based on the three-phase voltages, calculate the interphase loop voltage; Based on the preset target de-icing current value, the total line current and the phase-to-phase loop voltage, calculate the initial impedance modulus of the adjustable RC load device in the line de-icing equipment. Based on the initial impedance modulus, a closed-loop current is generated, wherein the closed-loop current is used to melt ice on two-phase operating lines in the distribution network.

2. The method according to claim 1, characterized in that, The calculation of the initial impedance modulus of the adjustable RC load device based on the preset target de-icing current value, the total line current, and the phase-to-phase loop voltage includes: Based on the target de-icing current value and the total line current, determine the required minimum loop closing current; Based on the phase-to-phase closing loop voltage and the required minimum closing loop current, the initial impedance magnitude is calculated according to a preset formula.

3. The method according to claim 1, characterized in that, Also includes: After the loop current is injected, the current three-phase voltage and total line current at the access point are continuously monitored. Based on the current three-phase voltage, determine the current interphase loop closing voltage; If the current phase-to-phase loop voltage changes and the total line current is less than the target de-icing current value, the impedance modulus of the adjustable RC load device shall be reduced.

4. The method according to claim 1, characterized in that, Also includes: After the loop current is injected, the current three-phase voltage and total line current at the access point are continuously monitored. Based on the current three-phase voltage, determine the current phase voltage value at the end of the line; If the current line terminal phase voltage is detected to be lower than a preset voltage threshold and the total line current is not lower than the target de-icing current value, the ratio of capacitive reactance to resistance in the adjustable RC load device is increased.

5. A line de-icing device, characterized in that, The de-icing method described in any one of claims 1 to 4 includes: Uninterruptible power line connection device, used to make non-power-out mechanical connection with two-phase operating lines in the power distribution network through line connection hardware; A voltage and current acquisition device is used to acquire the magnitude of the three-phase voltage and the closed-loop current on both sides of the access point in the distribution network, wherein the access point is the connection point between the uninterruptible line connection device and the two-phase operating line in the distribution network. An adjustable RC load device is used to calculate the phase-to-phase loop voltage based on the three-phase voltage, and to calculate the initial impedance modulus corresponding to the adjustable RC load device based on the preset target de-icing current value, the total line current and the phase-to-phase loop voltage. Then, based on the initial impedance modulus, the loop current is formed, wherein the loop current is used to de-ic the two-phase operating lines in the distribution network.

6. The device according to claim 5, characterized in that, The adjustable RC load device includes an adjustable RC load unit and a control unit, wherein... The control unit is used to receive the loop current collected by the voltage and current acquisition device and the total line current collected by the line head-end communication. Based on the three-phase voltage, it calculates the phase-to-phase loop voltage and, based on the preset target de-icing current value, the loop current, the total line current, and the phase-to-phase loop voltage, calculates the impedance modulus value corresponding to the adjustable RC load device and generates control commands according to the impedance modulus value. The adjustable RC load unit is used to receive the control command and adjust the impedance based on the control command.

7. A line de-icing device, characterized in that, include: The acquisition module is used to acquire the three-phase voltage and total line current on both sides of the access point in the distribution network, wherein the access point is the connection point between the line de-icing device and the two-phase operating line in the distribution network. The first calculation module is used to calculate the interphase closed-loop voltage based on the three-phase voltage; The second calculation module is used to calculate the initial impedance modulus of the adjustable RC load device in the line ice melting equipment based on the preset target ice melting current value, the total line current and the phase-to-phase closed loop voltage. The generation module is used to generate a closed-loop current based on the initial impedance modulus, wherein the closed-loop current is used to melt ice on two-phase operating lines in the distribution network.

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 according to any one of claims 1 to 4.

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 according to any one of claims 1 to 4.

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 according to any one of claims 1 to 4.

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