Anti-islanding protection method and apparatus for power distribution network, and electronic device and storage medium
By acquiring and comparing electrical signals from distribution lines, and using weighted summation and fusion models for islanding detection, the problem of low efficiency in existing distribution network anti-islanding protection is solved, and flexible and reliable islanding detection is achieved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG POWER GRID CO LTD
- Filing Date
- 2024-12-09
- Publication Date
- 2026-06-18
Smart Images
Figure CN2024137884_18062026_PF_FP_ABST
Abstract
Description
Anti-islanding protection methods, devices, electronic equipment and storage media for power distribution networks Technical Field
[0001] This disclosure relates to the field of anti-islanding protection, and more specifically, to an anti-islanding protection method, device, electronic equipment, and storage medium for a power distribution network. Background Technology
[0002] Distributed generators (DGs) operating in the distribution network need to be equipped with anti-islanding protection to prevent unplanned islanding from forming in the distribution lines during power outages, which could endanger the personal safety of maintenance personnel and affect automatic reclosing and power supply quality.
[0003] Currently, the anti-islanding protection methods for distribution networks in related technologies usually rely on a pre-built and real-time updated distribution network topology. When the automatic reclosing and the topology of the distribution lines change, the calculation algorithm needs to update the distribution network topology information in a timely manner; or it is necessary to build an independent communication device to construct a communication network to monitor the status of the circuit breakers at the outlets of each line. The investment and construction costs are high and the flexibility is poor. In summary, the efficiency of anti-islanding protection for distribution networks in related technologies is low.
[0004] There is currently no effective solution to the above problems. Summary of the Invention
[0005] This disclosure provides a method, apparatus, electronic device, and storage medium for islanding protection of distribution networks, in order to at least solve the technical problem of low efficiency in islanding protection of distribution networks in related technologies.
[0006] According to one aspect of the present disclosure, a method for preventing islanding in a power distribution network is provided, comprising: acquiring an electrical signal of a target power distribution line to be detected for islanding in the power distribution network to obtain an initial electrical signal; acquiring electrical signals of adjacent power distribution lines to obtain an adjacent electrical signal, wherein the adjacent power distribution lines are used to represent power distribution lines in the power distribution network that are adjacent to the target power distribution line; performing islanding detection on the target power distribution line based on the initial electrical signal and the adjacent electrical signal to obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanded state; and performing anti-islanding protection on the target power distribution line if the detection result indicates that the target power distribution line is in an islanded state.
[0007] Optionally, the adjacent power distribution lines include a first adjacent power distribution line and a second adjacent power distribution line; obtaining the electrical signals of the adjacent power distribution lines to obtain the adjacent electrical signals includes: obtaining the electrical signals of the first adjacent power distribution line to obtain the first adjacent electrical signal, and obtaining the electrical signals of the second adjacent power distribution line to obtain the second adjacent electrical signal; and performing a weighted summation of the first adjacent electrical signal and the second adjacent electrical signal to obtain the adjacent electrical signals.
[0008] Optionally, adjacent power distribution lines include multiple adjacent power distribution sub-lines; obtaining the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals includes: obtaining the electrical signals of multiple adjacent power distribution sub-lines to obtain multiple adjacent sub-electrical signals; and fusing the multiple adjacent sub-electrical signals to obtain adjacent electrical signals.
[0009] Optionally, multiple adjacent sub-electrical signals are fused to obtain adjacent electrical signals, including: using a preset neural network fusion model to fuse multiple adjacent sub-electrical signals to obtain adjacent electrical signals.
[0010] Optionally, based on the initial electrical signal and adjacent electrical signals, islanding detection is performed on the target power distribution line to obtain detection results, including: comparing the initial electrical signal and adjacent electrical signals to obtain comparison results, wherein the comparison results are used to characterize whether the difference between the initial electrical signal and adjacent electrical signals is greater than a preset threshold; and based on the comparison results, islanding detection is performed on the target power distribution line to obtain detection results.
[0011] Optionally, the initial electrical signal is compared with the adjacent electrical signals to obtain a comparison result, including: determining the ratio between the initial electrical signal and the adjacent electrical signals to obtain a target ratio; and comparing the target ratio with a preset threshold to obtain a comparison result.
[0012] According to another aspect of the embodiments of this disclosure, an anti-islanding protection device for a power distribution network is also provided, comprising: a first acquisition module configured to acquire the electrical signal of a target power distribution line to be islanded in the power distribution network to obtain an initial electrical signal; a second acquisition module configured to acquire the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals, wherein the adjacent power distribution lines are used to represent power distribution lines adjacent to the target power distribution line in the power distribution network; a detection module configured to perform islanding detection on the target power distribution line based on the initial electrical signal and the adjacent electrical signals to obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanded state; and a protection module configured to perform anti-islanding protection on the target power distribution line when the detection result indicates that the target power distribution line is in an islanded state.
[0013] According to another aspect of the present disclosure, an electronic device is also provided, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of the present disclosure when it runs.
[0014] According to another aspect of the embodiments of the present disclosure, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored executable program, wherein, when the executable program is executed, it controls the device where the computer-readable storage medium is located to perform the methods of the various embodiments of the present disclosure.
[0015] According to another aspect of the embodiments of this disclosure, a computer program product is also provided, including a computer program that, when executed by a processor, implements the methods of various embodiments of this disclosure.
[0016] According to another aspect of the embodiments of this disclosure, a computer program product is also provided, including a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods in various embodiments of this disclosure.
[0017] According to another aspect of the embodiments of this disclosure, a computer program is also provided, which, when executed by a processor, implements the methods of the various embodiments of this disclosure.
[0018] This disclosure provides a method for islanding protection in a power distribution network, comprising: acquiring the electrical signal of a target power distribution line to be islanded in the power distribution network to obtain an initial electrical signal; acquiring the electrical signals of adjacent power distribution lines to obtain an adjacent electrical signal, wherein the adjacent power distribution lines are used to represent power distribution lines adjacent to the target power distribution line in the power distribution network; performing islanding detection on the target power distribution line based on the initial electrical signal and the adjacent electrical signal to obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanded state; and performing islanding protection on the target power distribution line if the detection result indicates that the target power distribution line is in an islanded state. It is noteworthy that this disclosure can perform islanding detection on the target power distribution line by acquiring the electrical signals of the target power distribution line and adjacent power distribution lines. By comparing the electrical signals of the target power distribution line and the adjacent power distribution lines, the reliance on dedicated communication channels can be avoided, reducing the demand for communication channels and improving the flexibility and reliability of the system. By comparing the electrical signals of the target power distribution line and the adjacent power distribution lines, islanding detection can be performed more flexibly. The selection of adjacent power distribution lines can be adjusted according to the actual situation. Different adjacent power distribution lines can be selected for comparison based on different situations, so as to better adapt to different power distribution network structures and operating conditions. This can more accurately determine whether the target power distribution line is in an islanded state, avoid misjudgment or omission, improve the accuracy of detection, and thus solve the technical problem of low efficiency in anti-islanding protection of power distribution networks in related technologies. Attached Figure Description
[0019] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:
[0020] Figure 1 is a flowchart of an anti-islanding protection method for a power distribution network according to an embodiment of the present disclosure;
[0021] Figure 2 is a schematic diagram of an anti-islanding protection device for a power distribution network according to an embodiment of the present disclosure. Detailed Implementation
[0022] To enable those skilled in the art to better understand the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present disclosure.
[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure 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 this disclosure 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 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.
[0024] According to an embodiment of this disclosure, an embodiment of an anti-islanding protection method for a power distribution network is provided. It can 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.
[0025] Figure 1 is a flowchart of an anti-islanding protection method for a distribution network according to an embodiment of the present disclosure. As shown in Figure 1, the method includes the following steps:
[0026] Step S102: Obtain the electrical signal of the target distribution line to be detected for islanding in the distribution network to obtain the initial electrical signal.
[0027] In one optional embodiment, sensors or detection devices can first be installed on the target power distribution line. These devices can monitor electrical signals on the line in real time, including information such as voltage and frequency. These sensors can be voltage sensors, current sensors, frequency sensors, etc., and can acquire real-time electrical signal data of the target power distribution line. This data can be transmitted to a monitoring center or control center for processing and analysis. Communication technologies, such as wireless communication and wired communication, can be used to transmit data to the center to achieve remote monitoring and management. The monitoring center can process the electrical signal data using data analysis algorithms to extract key information, such as whether the voltage is stable and whether the frequency is normal. In the above process, through real-time monitoring and data analysis, intelligent monitoring and management of the power distribution line can be achieved, improving operational efficiency and response speed. An automatic monitoring system can reduce the frequency of manual inspections, lower maintenance costs and manpower input, improve work efficiency, achieve intelligent operation management, and reduce maintenance costs and manpower input.
[0028] Step S104: Obtain the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals.
[0029] Among them, adjacent distribution lines are used to indicate distribution lines in the distribution network that are adjacent to the target distribution line.
[0030] In one optional embodiment, acquiring the electrical signals of adjacent power distribution lines allows for the detection and monitoring of the target power distribution line's status, thereby ensuring the normal operation and safety of the power distribution network. Firstly, current and voltage sensors can be installed on adjacent power distribution lines to monitor changes in their electrical signals in real time. Data acquisition equipment can then collect and transmit the electrical signal data detected by the sensors on the adjacent lines to the monitoring system. This data includes parameters such as current, voltage, and frequency, reflecting the line's operating status and power load. The monitoring system processes and analyzes the collected electrical signal data, identifying the target power distribution line's status through algorithms and models. The system can monitor line connectivity, current flow direction, power load, and other information to determine if islanding occurs. By monitoring the status of adjacent lines in real time, abnormal situations in the target power distribution line can be detected and addressed promptly, preventing power outages and faults caused by islanding.
[0031] Step S106: Based on the initial electrical signal and adjacent electrical signals, islanding detection is performed on the target power distribution line to obtain the detection result.
[0032] The detection results are used to indicate whether the target power distribution line is in an islanded state.
[0033] In one optional embodiment, the target distribution line can be detected based on an initial electrical signal and adjacent electrical signals. Specifically, the initial electrical signal of the target distribution line can be acquired first. The electrical signals of adjacent lines can also be acquired. These adjacent line signals can be collected by monitoring equipment and may include parameters such as voltage and current. By comparing the electrical signals of the target line and the adjacent lines, the correlation between the initial and adjacent signals can be obtained. By analyzing the electrical signals of the target line and the adjacent lines, it can be determined whether the target distribution line is in an islanded state. For example, if the electrical signal of the target line differs significantly from that of the adjacent lines, such as abnormal voltage frequency or abnormal current waveform, then an islanded state may exist. Through the above steps, islanding problems can be detected and addressed in a timely manner, reducing the occurrence of power grid faults and ensuring the stable operation of the power system. An automated islanding detection system can reduce the workload of manual inspection and maintenance, lowering maintenance costs.
[0034] Step S108: If the detection result indicates that the target power distribution line is in an islanded state, implement anti-islanding protection for the target power distribution line.
[0035] In one optional embodiment, when the detection result indicates that the target distribution line is in an islanded state, anti-islanding protection can be implemented on the target distribution line to ensure the normal operation and safe and stable operation of the power grid. Specifically, by installing intelligent sensors, monitoring devices, and communication modules on the target distribution line, real-time monitoring and data acquisition of the distribution line, as well as remote communication with the power distribution system, can be achieved. When the system detects that the target distribution line is in an islanded state, it can immediately issue an alarm signal and activate the anti-islanding protection device. The anti-islanding protection device can be a special switching device that controls the operation of the switch to disconnect and isolate the target distribution line, preventing the further development of the islanded state. After confirming that the target distribution line has escaped the islanded state, it can be promptly reconnected to restore its normal connection and power supply status with the main power grid. This disclosure can quickly and accurately detect and disconnect target distribution lines in an islanded state, preventing the expansion of the islanded state and its impact on the safe operation of the entire power distribution system.
[0036] This disclosure provides a method for islanding protection in a power distribution network, comprising: acquiring the electrical signal of a target power distribution line to be islanded in the power distribution network to obtain an initial electrical signal; acquiring the electrical signals of adjacent power distribution lines to obtain an adjacent electrical signal, wherein the adjacent power distribution lines are used to represent power distribution lines adjacent to the target power distribution line in the power distribution network; performing islanding detection on the target power distribution line based on the initial electrical signal and the adjacent electrical signal to obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanded state; and performing islanding protection on the target power distribution line if the detection result indicates that the target power distribution line is in an islanded state. It is noteworthy that this disclosure can perform islanding detection on the target power distribution line by acquiring the electrical signals of the target power distribution line and adjacent power distribution lines. By comparing the electrical signals of the target power distribution line and the adjacent power distribution lines, the reliance on dedicated communication channels can be avoided, reducing the demand for communication channels and improving the flexibility and reliability of the system. By comparing the electrical signals of the target power distribution line and the adjacent power distribution lines, islanding detection can be performed more flexibly. The selection of adjacent power distribution lines can be adjusted according to the actual situation. Different adjacent power distribution lines can be selected for comparison based on different situations, so as to better adapt to different power distribution network structures and operating conditions. This can more accurately determine whether the target power distribution line is in an islanded state, avoid misjudgment or omission, improve the accuracy of detection, and thus solve the technical problem of low efficiency in anti-islanding protection of power distribution networks in related technologies.
[0037] Optionally, the adjacent power distribution lines include a first adjacent power distribution line and a second adjacent power distribution line; obtaining the electrical signals of the adjacent power distribution lines to obtain the adjacent electrical signals includes: obtaining the electrical signals of the first adjacent power distribution line to obtain the first adjacent electrical signal, and obtaining the electrical signals of the second adjacent power distribution line to obtain the second adjacent electrical signal; and performing a weighted summation of the first adjacent electrical signal and the second adjacent electrical signal to obtain the adjacent electrical signals.
[0038] In one optional embodiment, adjacent distribution lines may include two adjacent lines, namely a first adjacent distribution line and a second adjacent distribution line. Electrical signals from the first and second adjacent distribution lines can be acquired using sensors or monitoring equipment in the distribution network. These signals reflect important parameters such as current, voltage, and power of the distribution lines. Next, the first and second adjacent electrical signals can be weighted and summed. Different weighting coefficients can be set according to actual conditions during the weighted summation to ensure a reasonable combination of electrical signals from different distribution lines. Through weighted summation, adjacent electrical signals can be obtained, which can integrate information from two adjacent distribution lines. In the above steps, the electrical signals of adjacent distribution lines can complement and verify each other. Weighted summation can reduce the possibility of false positives and false negatives, improve the reliability and stability of the anti-islanding protection system, and contribute to improving the operating efficiency and economy of the power grid.
[0039] Optionally, adjacent power distribution lines include multiple adjacent power distribution sub-lines; obtaining the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals includes: obtaining the electrical signals of multiple adjacent power distribution sub-lines to obtain multiple adjacent sub-electrical signals; and fusing the multiple adjacent sub-electrical signals to obtain adjacent electrical signals.
[0040] In one optional embodiment, adjacent power distribution lines may further include multiple adjacent sub-circuits, each with its own independent electrical signal. Sensors or monitoring devices can be installed on each sub-circuit to monitor parameters such as current, voltage, and frequency in real time and transmit the monitored data to the monitoring center. These sensors can acquire the electrical signals of each sub-circuit in real time. By acquiring the electrical signals of multiple adjacent power distribution lines, multiple adjacent sub-signals are obtained. These sub-signals contain the power parameters of each sub-circuit and can be used to analyze the operating status of the line. Finally, the multiple adjacent sub-signals can be fused to obtain an adjacent electrical signal. During the fusion process, data processing and analysis methods can be used to integrate the various sub-signals to obtain the overall electrical signal of the adjacent lines. By monitoring and analyzing the electrical signals of adjacent power distribution lines, islanding problems can be detected and resolved in a timely manner, improving the safety and reliability of the power distribution system and providing more reference data for the islanding detection of target power distribution lines in the power distribution network.
[0041] Optionally, multiple adjacent sub-electrical signals are fused to obtain adjacent electrical signals, including: using a preset neural network fusion model to fuse multiple adjacent sub-electrical signals to obtain adjacent electrical signals.
[0042] In one optional embodiment, the acquired adjacent sub-signals can undergo data preprocessing, including data cleaning and noise reduction, to ensure data accuracy and reliability. Next, a preset neural network fusion model can be established, which can fuse multiple adjacent sub-signals to obtain adjacent electrical signals. The preprocessed adjacent sub-signals can be input into the preset neural network fusion model. After calculation and optimization by the neural network, adjacent electrical signals are obtained, reflecting the comprehensive situation of multiple sub-signals. In the above process, by fusing multiple adjacent sub-signals, the operating conditions of different parts can be comprehensively considered, resulting in more accurate adjacent electrical signals, improving the accuracy and reliability of monitoring. The neural network model enables real-time data processing and analysis, quickly reflecting the real-time operating status of the distribution network, and promptly identifying problems and taking measures.
[0043] Optionally, based on the initial electrical signal and adjacent electrical signals, islanding detection is performed on the target power distribution line to obtain detection results, including: comparing the initial electrical signal and adjacent electrical signals to obtain comparison results, wherein the comparison results are used to characterize whether the difference between the initial electrical signal and adjacent electrical signals is greater than a preset threshold; and based on the comparison results, islanding detection is performed on the target power distribution line to obtain detection results.
[0044] In one optional embodiment, the acquired initial electrical signal and adjacent electrical signals can be preprocessed, including noise reduction and filtering, to ensure data accuracy and stability. The processed initial electrical signal and adjacent electrical signals can be compared to obtain a comparison result. The comparison method can employ correlation analysis, difference calculation, or other methods to characterize the similarity or difference between the two. During the comparison process, a preset threshold can be set to determine whether the difference between the initial electrical signal and adjacent electrical signals exceeds this threshold. If it exceeds the threshold, it can be determined that the distribution line may be isolated. Then, based on the comparison result and the threshold determination, islanding detection can be performed on the target distribution line. In the above process, by comparing the initial electrical signal and adjacent electrical signals, it is possible to quickly and accurately determine whether the distribution line is isolated, improving detection efficiency. By setting a threshold and comparison method, normal conditions and isolated conditions can be effectively distinguished, reducing the false positive rate and improving detection accuracy.
[0045] Optionally, the initial electrical signal is compared with the adjacent electrical signals to obtain a comparison result, including: determining the ratio between the initial electrical signal and the adjacent electrical signals to obtain a target ratio; and comparing the target ratio with a preset threshold to obtain a comparison result.
[0046] In one optional embodiment, the initial electrical signal is compared with adjacent electrical signals. The relationship between them can be determined by calculating the difference or ratio between the two, which helps to determine whether the electrical signals of different parts of the system are consistent and whether islanding exists. Based on the comparison result, the ratio between the initial electrical signal and adjacent electrical signals can be obtained, and thus a target ratio can be obtained. This target ratio helps to determine whether the relationship between different parts of the system is normal. The target ratio can be compared with a preset threshold to determine whether islanding exists in the system. If the target ratio exceeds the preset threshold, it indicates that islanding may exist in the system, and timely handling is possible. By comparing the initial electrical signal and adjacent electrical signals, abnormalities in the system can be detected in a timely manner, reducing the possibility of islanding and improving the reliability and stability of the system. By calculating the ratio and comparison threshold, the existence of islanding in the system can be quickly and accurately determined, avoiding misjudgments and delays in processing time, facilitating timely detection and handling of islanding, reducing system failures and losses, lowering system maintenance costs, and improving operational efficiency.
[0047] The following describes the technical solution proposed in this disclosure with reference to an optional embodiment. Islanding detection based on communication can rely on radio communication to transmit islanding status signals. Its islanding detection performance is generally independent of the type of distributed generator and does not require measuring electrical parameters in the distributed system. Instead, it can directly determine whether islanding has formed by detecting all relevant line circuit breakers and reclosing devices in the system. This method can employ methods such as transmitting circuit breaker trip signals or power line carrier communication. This disclosure proposes an anti-islanding protection method based on peer-to-peer communication. Utilizing a peer-to-peer communication network, islanding identification is achieved by comparing the electrical quantities of the current line with those of adjacent lines.
[0048] In this disclosure, peer-to-peer communication can refer to the exchange of voltage and frequency information between hosts on different lines. Therefore, when a distribution line is connected to multiple distributed power sources, a host configuration strategy needs to be built based on communication. Specifically, each distributed power source is configured with a 1-second timer, establishing communication with other distributed power sources on the same line every 1 second; during communication, it confirms with other distributed power sources on the same line whether a host exists; if a host exists, the distributed power source is configured as a slave, monitoring changes in voltage and frequency in the system; if no host exists, the distributed power source is configured as a host, sharing the voltage and frequency information of its line with other host distributed power sources on the local area network.
[0049] The host distributed power supply can continuously share the voltage and frequency of its own line in the local area network (LAN), and capture the voltage and frequency information of other lines from the communication network. This facilitates the sharing of voltage and frequency information of the own line among the host distributed power supplies in the LAN. The host communication frame is designed to consist of five parts: address frame, voltage information frame, frequency information frame, and CRC checksum. The host continuously shares the voltage and frequency information of its own line with the local LAN at a frequency of 1Hz, and requests the voltage and frequency information of its own line from the host on the adjacent line.
[0050] In this disclosure, the distributed power supplies of different lines identify isolated systems by comparing their respective voltage and frequency information, as follows: During a single communication cycle, the distributed power supply of any line must capture the voltage and frequency information of at least two adjacent lines; let the voltage and frequency of this line be U... B f B The voltage and frequency of adjacent line 1 are U1 and f1, and the voltage and frequency of adjacent line 2 are U2 and f2; when U B ≠U1=U2 and f B If f1 = f2, then this line is determined to be operating in islanded mode, and the master unit is out of service. The slave protection strategy involves the slave distributed power supply in the power distribution line monitoring the line voltage and frequency change trends in real time. If voltage U... c Frequency f c The protection mechanism activates when the set threshold is exceeded.
[0051] The technical solution proposed in this disclosure does not require configuring global topology information. Distributed power sources on each line only need to obtain the voltage and frequency information of two adjacent lines to complete islanding identification. It offers flexible configuration and is easy to promote. It boasts high reliability, as it does not rely on fiber optic communication for information exchange, and the host can automatically configure itself via communication, ensuring the reliability of this method. It also has high applicability, primarily relying on communication for islanding identification, thus avoiding the common problems of non-operation and false operation in existing mainstream passive and active anti-islanding protection systems.
[0052] According to another aspect of the present disclosure, an anti-islanding protection device for a distribution network is also provided. This device can perform the power supply restoration method for the distribution network described in the above embodiments. The specific implementation method and preferred application scenarios are the same as those described in the above embodiments, and will not be repeated here.
[0053] Figure 2 is a schematic diagram of an anti-islanding protection device for a power distribution network according to an embodiment of the present disclosure. As shown in Figure 2, the device includes the following: a first acquisition module 202, a second acquisition module 204, a detection module 206, and a protection module 208.
[0054] The system comprises the following modules: a first acquisition module for acquiring the electrical signal of the target distribution line to be islanded in the distribution network, thus obtaining an initial electrical signal; a second acquisition module for acquiring the electrical signals of adjacent distribution lines, thus obtaining adjacent electrical signals, wherein adjacent distribution lines refer to distribution lines in the distribution network that are adjacent to the target distribution line; a detection module for performing islanding detection on the target distribution line based on the initial electrical signal and the adjacent electrical signals, thus obtaining a detection result, wherein the detection result indicates whether the target distribution line is in an islanded state; and a protection module for performing anti-islanding protection on the target distribution line if the detection result indicates that the target distribution line is in an islanded state.
[0055] The adjacent power distribution lines include a first adjacent power distribution line and a second adjacent power distribution line; the second acquisition module is also used to acquire the electrical signal of the first adjacent power distribution line to obtain the first adjacent electrical signal, and acquire the electrical signal of the second adjacent power distribution line to obtain the second adjacent electrical signal; and to perform a weighted summation of the first adjacent electrical signal and the second adjacent electrical signal to obtain the adjacent electrical signal.
[0056] The adjacent power distribution lines include multiple adjacent power distribution electronic lines; the second acquisition module is also used to acquire the electrical signals of multiple adjacent power distribution electronic lines to obtain multiple adjacent sub-electrical signals; and to fuse the multiple adjacent sub-electrical signals to obtain adjacent electrical signals.
[0057] The second acquisition module is also used to fuse multiple adjacent sub-electrical signals using a preset neural network fusion model to obtain adjacent electrical signals.
[0058] The detection module is also used to compare the initial electrical signal with adjacent electrical signals to obtain a comparison result. The comparison result is used to characterize whether the difference between the initial electrical signal and adjacent electrical signals is greater than a preset threshold. Based on the comparison result, islanding detection is performed on the target power distribution line to obtain a detection result.
[0059] The detection module is also used to determine the ratio of the initial electrical signal and the adjacent electrical signals to obtain the target ratio; and to compare the target ratio with a preset threshold to obtain the comparison result.
[0060] Embodiments of this disclosure also provide an electronic device, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods described in various embodiments of this disclosure when it runs.
[0061] The aforementioned memory can refer to devices inside a computer used to store data and programs, including RAM, hard disks, etc. RAM can be used to temporarily store running programs and data, while hard disks can be used to store programs and data long-term. Memory enables the computer to read and write data and execute programs. The aforementioned processor is responsible for executing instructions in computer programs and performing data processing. It can also be responsible for controlling and executing various operations, including arithmetic operations, logical operations, and data transmission.
[0062] Embodiments of this disclosure also provide a computer-readable storage medium including a stored executable program, wherein, when the executable program is executed, it controls the device on which the computer-readable storage medium resides to perform the methods of the various embodiments of this disclosure.
[0063] The aforementioned computer storage media can refer to the media used in computer memory to store certain discontinuous physical quantities. Computer storage media mainly include semiconductors, magnetic cores, magnetic drums, magnetic tapes, laser discs, etc. Computer-readable storage media include stored programs, which can be a set of instructions that a computer can recognize and execute, running on an electronic computer to meet certain information needs.
[0064] Embodiments of this disclosure also provide a computer program product, including a computer program that, when executed by a processor, implements the methods of various embodiments of this disclosure.
[0065] The aforementioned computer program products can refer to software programs that have been written, tested, and released, and can run on computers or other devices. Computer program products can include application programs, operating systems, utility software, etc., used to achieve specific functions or solve specific problems.
[0066] Embodiments of this disclosure also provide a computer program product, including a non-volatile computer-readable storage medium for storing a computer program that, when executed by a processor, implements the methods described in various embodiments of this disclosure.
[0067] The aforementioned non-volatile computer-readable storage medium can refer to a medium for storing data. Non-volatile computer-readable storage media can retain data without loss when power is off and can be used to store long-term data, such as operating systems, applications, and user files. Non-volatile storage media can include hard disk drives, solid-state drives, optical disks, and flash memory storage devices, etc.
[0068] Embodiments of this disclosure also provide a computer program that, when executed by a processor, implements the methods described in the various embodiments of this disclosure.
[0069] The aforementioned computer program can refer to a set of instructions used to tell the computer to perform specific tasks or operations. Computer programs can be written by programmers using specific programming languages and can include algorithms, data structures, logic, and control flow. Computer programs can be used for a variety of purposes, including application software, operating systems, etc.
[0070] In the above embodiments of this disclosure, 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.
[0071] In the several embodiments provided in this disclosure, 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 couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.
[0072] 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.
[0073] Furthermore, the functional units in the various embodiments of this disclosure 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.
[0074] 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 computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, 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 this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.
[0075] The above description is only a preferred embodiment of this disclosure. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure. Industrial applicability
[0076] This disclosure enables islanding detection of a target power distribution line by acquiring the electrical signals of the target line and adjacent power distribution lines. By comparing the electrical signals of the target line and adjacent lines, reliance on dedicated communication channels is avoided, reducing communication channel requirements and improving system flexibility and reliability. Comparing the electrical signals of the target line and adjacent lines allows for more flexible islanding detection. The selection of adjacent power distribution lines can be adjusted according to actual conditions, allowing for comparison with different adjacent lines to better adapt to different power distribution network structures and operating conditions. This enables more accurate determination of whether the target power distribution line is in an islanded state, avoiding false positives or false negatives, thus improving detection accuracy and solving the technical problem of low efficiency in anti-islanding protection of power distribution networks in related technologies.
Claims
1. A method for preventing islanding in a power distribution network, comprising: Acquire the electrical signal of the target distribution line to be detected for islanding in the distribution network to obtain the initial electrical signal; Acquire the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals, wherein the adjacent power distribution lines are used to represent the power distribution lines in the power distribution network that are adjacent to the target power distribution line; Based on the initial electrical signal and the adjacent electrical signals, islanding detection is performed on the target power distribution line to obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanding state; If the detection result indicates that the target power distribution line is in an islanded state, anti-islanding protection is applied to the target power distribution line.
2. The method for preventing islanding in a power distribution network according to claim 1, wherein, The adjacent power distribution lines include the first adjacent power distribution line and the second adjacent power distribution line; Obtain the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals, including: Obtain the electrical signal of the first adjacent power distribution line to obtain the first adjacent electrical signal, and obtain the electrical signal of the second adjacent power distribution line to obtain the second adjacent electrical signal; The adjacent electrical signals are obtained by weighted summation of the first adjacent electrical signal and the second adjacent electrical signal.
3. The method for preventing islanding in a power distribution network according to claim 1, wherein, The adjacent power distribution lines include multiple adjacent power distribution lines; Obtain the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals, including: Obtain the electrical signals of the multiple adjacent electronic circuits to obtain multiple adjacent sub-electrical signals; The multiple adjacent sub-signals are fused to obtain the adjacent electrical signal.
4. The method for preventing islanding in a power distribution network according to claim 3, wherein, The multiple adjacent sub-signals are fused to obtain the adjacent electrical signals, including: Using a preset neural network fusion model, the multiple adjacent sub-electrical signals are fused to obtain the adjacent electrical signals.
5. The method for preventing islanding in a distribution network according to claim 1, wherein, Based on the initial electrical signal and the adjacent electrical signals, islanding detection is performed on the target power distribution line to obtain the detection results, including: The initial electrical signal and the adjacent electrical signals are compared to obtain a comparison result, wherein the comparison result is used to characterize whether the difference between the initial electrical signal and the adjacent electrical signals is greater than a preset threshold. Based on the comparison results, islanding detection is performed on the target power distribution line to obtain the detection results.
6. The method for preventing islanding in a distribution network according to claim 5, wherein, The initial electrical signal and the adjacent electrical signals are compared to obtain the comparison result, including: The ratio of the initial electrical signal to the adjacent electrical signal is determined to obtain the target ratio. The target ratio is compared with the preset threshold to obtain the comparison result.
7. An anti-islanding protection device for a power distribution network, comprising: The first acquisition module is configured to acquire the electrical signal of the target distribution line to be detected as an island in the distribution network, and obtain the initial electrical signal. The second acquisition module is configured to acquire the electrical signals of adjacent power distribution lines to obtain adjacent electrical signals, wherein the adjacent power distribution lines are used to represent the power distribution lines in the power distribution network that are adjacent to the target power distribution line; The detection module is configured to perform islanding detection on the target power distribution line based on the initial electrical signal and the adjacent electrical signals, and obtain a detection result, wherein the detection result is used to indicate whether the target power distribution line is in an islanding state; The protection module is configured to perform anti-islanding protection on the target power distribution line when the detection result indicates that the target power distribution line is in the islanded state.
8. The method for preventing islanding in a power distribution network according to claim 7, wherein, The second acquisition module is further configured to acquire the electrical signal of the first adjacent power distribution line to obtain the first adjacent electrical signal, and acquire the electrical signal of the second adjacent power distribution line to obtain the second adjacent electrical signal; and perform a weighted summation of the first adjacent electrical signal and the second adjacent electrical signal to obtain the adjacent electrical signal.
9. The method for preventing islanding in a power distribution network according to claim 7, wherein, The adjacent power distribution lines include multiple adjacent power distribution lines; the second acquisition module is further configured to acquire the electrical signals of the multiple adjacent power distribution lines to obtain multiple adjacent sub-electrical signals; and to fuse the multiple adjacent sub-electrical signals to obtain the adjacent electrical signal.
10. The method for preventing islanding in a power distribution network according to claim 9, wherein, The second acquisition module is further configured to fuse the multiple adjacent sub-electrical signals using a preset neural network fusion model to obtain the adjacent electrical signals.
11. The method for preventing islanding in a power distribution network according to claim 7, wherein, The detection module is further configured to compare the initial electrical signal with the adjacent electrical signal to obtain a comparison result, wherein the comparison result is used to characterize whether the difference between the initial electrical signal and the adjacent electrical signal is greater than a preset threshold; based on the comparison result, islanding detection is performed on the target power distribution line to obtain the detection result.
12. The method for preventing islanding in a distribution network according to claim 11, wherein, The detection module is further configured to determine the ratio of the initial electrical signal to the adjacent electrical signal to obtain a target ratio; and to compare the target ratio with the preset threshold to obtain the comparison result.
13. An electronic device, comprising: Memory, which stores executable programs; A processor for running the program, wherein the program executes the anti-islanding protection method for a distribution network according to any one of claims 1 to 6.
14. A computer-readable storage medium comprising a stored executable program, wherein, When the executable program is running, it controls the device containing the storage medium to perform the anti-islanding protection method for the power distribution network as described in any one of claims 1 to 6.
15. A computer program product comprising a computer program that, when executed by a processor, implements the anti-islanding protection method for a power distribution network according to any one of claims 1 to 6.