Fault coordination recovery method for power distribution network electric power and communication system under extreme disasters

Abstract

The invention belongs to the field of power failure maintenance, and particularly discloses a power distribution network power and communication system failure coordination recovery method under extreme disasters, which comprises the following steps: constructing a power distribution network power-communication system model according to the characteristics of a power distribution network communication system, and analyzing the approach and mechanism of the power distribution network failure caused by the extreme disasters; formulating a power distribution network communication system optimization recovery strategy based on mobile self-organization; formulating an intelligent terminal communication robustness improvement scheme of a wireless ad hoc network technology based on LoRa; and formulating a coordination recovery strategy of the power distribution network power and the communication system under the extreme disaster. According to the method, the power and communication system is planned and technically optimized, so that the disaster response capability of the power distribution network can be remarkably improved, the influence of disasters on the power and communication system is reduced, the problems of power failure, communication interruption and the like are avoided or reduced, and the stability and reliability of the system are improved.

Description

Technical Field

[0001] This invention belongs to the field of power fault repair, specifically relating to a method for coordinated recovery of power and communication systems in a power distribution network under extreme disasters. Background Technology

[0002] Extreme disasters cause large-scale failures in the power and communication systems of the affected areas, severely impacting power supply stability and even triggering widespread blackouts, resulting in severe social impacts and incalculable economic losses. In the post-disaster power grid recovery process, the power system typically recovers before the communication and information systems, with a lack of coordination between the two. However, effective coordination between the two could lead to a more efficient and rapid recovery. Current distribution network recovery strategies typically involve two parts: grid reconfiguration and fault repair. Studies of the distribution network recovery process have not yet considered the impact of the distribution network communication system. In reality, grid reconfiguration relies on the dispatch automation of the distribution network communication system, and fault recovery depends on the communication system's ability to locate and isolate power faults. Consequently, the resulting post-disaster recovery strategies often fail to achieve the expected results.

[0003] Currently, research on the impact of extreme disasters on distribution network systems, both domestic and international experts, primarily focus on the failures caused by extreme disasters to power lines and towers. Much research concentrates on predicting power line reliability, forecasting pre-disaster faults in the distribution network, and strategies for the power grid to cope with extreme disasters. Research on the impact of failures on the distribution network communication system is relatively limited. Regarding power fault repair in distribution networks, current research generally focuses on grid reconfiguration and fault recovery, yielding numerous results. However, these results are largely based on the accurate location of fault points in the distribution network and do not consider the impact of failures on the distribution network communication system. Furthermore, research on the impact of extreme disasters on distribution networks mostly focuses on the impact of disasters on power lines, lacking analysis of the impact of extreme disasters on the distribution network communication system. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention aims to provide a method for coordinated fault recovery of power and communication systems in distribution networks under extreme disasters. This method, through planning and technical optimization of power and communication systems, can significantly improve the disaster response capability of distribution networks, thereby reducing the impact of disasters on power and communication systems, avoiding or reducing the occurrence of power outages and communication interruptions, and improving the stability and reliability of the system.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for coordinated fault recovery of power distribution network and communication systems under extreme disasters, which is based on the following steps: S1. Based on the characteristics of the distribution network communication system, construct a power-communication system model for the distribution network, and analyze the pathways and mechanisms by which extreme disasters cause distribution network faults; S2. Develop optimization and recovery strategies for distribution network communication systems based on mobile self-organization; S3. Develop a robustness improvement scheme for smart terminal communication based on LoRa wireless self-organizing network technology; S4. Develop coordinated recovery strategies for power distribution networks and communication systems under extreme disasters.

[0006] Furthermore, in step S1, the main manifestations of power failures include pole collapse, wire breakage, and electrical faults; the main manifestations of communication system failures include wire breakage and node capacity loss causing adjacent node failures.

[0007] Furthermore, step S2 specifically includes the following: S2-1. Analyze the impact of communication system failures on distribution network restoration; after determining the location of the communication system failure, formulate an optimized restoration strategy for the mobile self-organizing distribution network communication system that combines multiple methods, including fiber optic repair, mobile base station repair, and emergency communication vehicles. S2-2. Establish a two-tiered objective for the restoration of the distribution network communication network after extreme disasters, and propose emergency repair principles for the distribution network communication network after extreme disasters.

[0008] Furthermore, the two-layer objective of step S2-2 includes an upper-layer objective and a lower-layer objective. The upper-layer objective is to minimize the failure cost, and the lower-layer objective is to minimize the repair time.

[0009] Furthermore, step S4 specifically includes the following steps: S4-1. Analyze the mutual conversion relationship between distribution network communication restoration and power fault restoration. With the goals of short power-side repair time and small power outage losses, and high communication-side coverage and high disaster loss statistics accuracy, establish a power-communication coordinated restoration model for the distribution network. S4-2. Decompose the post-disaster power distribution network system recovery process, and first propose a power-communication coordinated recovery strategy for the power distribution network with priority to communication recovery. S4-3. Based on the partial communication priority restoration in step S4-2, a power-communication coordinated restoration strategy for power-communication fault switching in the distribution network is further formulated; S4-4. Verify the rationality of the power-communication coordination recovery strategy for the distribution network formulated in step S4-3 using the IEEE 123-node example.

[0010] The beneficial effects of this invention are as follows: 1. This invention analyzes the mechanism of power and communication failures in distribution networks caused by extreme disasters and explores the impact of communication system failures on power restoration in distribution networks; from the perspective of the distribution network communication system itself, it proposes a research on optimized restoration strategies for distribution network communication systems based on mobile self-organization.

[0011] 2. This invention combines various emergency repair methods, such as fiber optic repair, mobile base station repair, and emergency communication vehicles, to quickly and effectively restore the power distribution network communication system during a disaster, and proposes post-disaster emergency repair principles applicable to power distribution network communication systems.

[0012] 3. This invention improves the robustness of last-mile control of the power grid by studying the communication methods of intelligent terminal units and adding LoRa-based wireless communication self-organizing network technology to enhance communication configuration redundancy.

[0013] 4. Based on actual post-disaster needs, this invention proposes a coordinated recovery strategy for the power and communication systems of a distribution network under extreme disasters. This strategy aims to minimize power outage losses and maximize communication coverage and disaster loss statistics, utilizing the principle of fault conversion. The goal is to achieve both short power-side repair time and minimal power loss. Considering the coordinated recovery of power and communication systems can effectively shorten the post-disaster repair time of the distribution network and significantly reduce power outage losses caused by distribution network faults. Detailed Implementation

[0014] The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention.

[0015] Extreme disasters can cause large-scale power outages in distribution networks and also in their communication systems. The main causes of these outages include collapsed poles (towers) and broken wires. Communication system failures can be caused by direct network topology disruptions due to wire breaks or indirect disruptions to adjacent nodes due to reduced node capacity. A large-scale communication system failure can severely impact the restoration of power to the distribution network.

[0016] To address this, this invention proposes a method for coordinated fault recovery of power and communication systems in distribution networks under extreme disasters. This method aims at coordinated recovery of the power and communication systems, effectively shortening the repair time of the disaster-stricken distribution network and significantly reducing power outage losses caused by distribution network faults. Through planning and technological innovation of power and communication systems, the disaster response capability of the distribution network can be improved, thereby reducing the impact of disasters on power and communication systems, avoiding or reducing power outages and communication interruptions, and improving system stability and reliability. Specifically, it includes the following steps: Step S1. Based on the characteristics of the distribution network communication system, construct a power-communication system model of the distribution network and analyze the pathways and mechanisms of distribution network faults caused by extreme disasters. The main manifestations of power faults include pole collapse, line breakage, and electrical faults; the main manifestations of communication system faults include line breakage and failure of adjacent nodes due to damaged node capacity.

[0017] Step S2. Develop an optimization and recovery strategy for the distribution network communication system based on mobile self-organization.

[0018] Currently, engineering projects do not place sufficient emphasis on the emergency repair of distribution network communication systems after extreme disasters. Priority is given to repairing power equipment, with communication system repair following. After studying and analyzing the application of fiber optic repair, emergency communication vehicles, and mobile public networks in power communication, the repair process mainly relies on human experience to prioritize the restoration of critical nodes, which is highly subjective. Once an extreme disaster occurs, the system's operating mode changes rapidly, and relying solely on human judgment inevitably leads to problems. To address this, this invention proposes a mobile self-organizing optimized recovery strategy for distribution network communication systems, utilizing multiple repair methods such as fiber optics, mobile base stations, and emergency communication vehicles. This lays the foundation for coordinated power-communication recovery of distribution networks after extreme disasters. Specifically, it includes: S2-1. Analyze the impact of communication system failures on distribution network restoration; after determining the location of the communication system failure, formulate an optimized restoration strategy for the mobile self-organizing distribution network communication system that combines multiple methods, including fiber optic repair, mobile base station repair, and emergency communication vehicles. S2-2. Establish a two-tiered objective for the recovery of the distribution network communication network after extreme disasters, and propose emergency repair principles for the distribution network communication network after extreme disasters. The two-tiered objective includes an upper-level objective and a lower-level objective. The upper-level objective is to minimize the failure cost, and the lower-level objective is to minimize the repair time.

[0019] Step S3. Develop a robustness improvement scheme for smart terminal communication based on LoRa wireless ad hoc networking technology.

[0020] Low-power wide-area wireless network (LPWAN) applications account for the largest proportion of IoT applications, and LoRa, as one of the LPWAN technologies, has gradually become a research hotspot in the IoT field. LoRa operates in the frequency band below 1GHz and integrates forward error correction coding, digital spread spectrum, adaptive speed regulation and other transmission technologies. It has the characteristics of long distance, low power consumption, low cost and strong anti-interference ability, and is the most widely used and most promising technology in LPWAN.

[0021] The Smart Terminal Unit (STU) is a key component of power distribution network control, undertaking crucial tasks such as monitoring the status of critical nodes and executing control commands. Currently, STU devices support communication methods including fiber optics and 4G / 5G networks. However, in the event of extreme disasters, severely affected areas may experience communication limitations due to the order of repairs to communication equipment, hindering power restoration. Therefore, this invention utilizes LoRa wireless ad hoc networking technology. When unable to directly receive control commands from the central control node, the STU automatically attempts to establish communication links with surrounding nodes based on its internally stored network topology information. This enhances the robustness of smart terminal communication, thereby improving the efficiency of post-disaster recovery and minimizing power outage losses.

[0022] Step S4. Develop a coordinated recovery strategy for the power and communication systems of the distribution network under extreme disasters.

[0023] Extreme natural disasters can cause significant damage to power and communication systems in distribution networks. During distribution network recovery, power and communication systems interact and constrain each other; coordination between the two can lead to more efficient and rapid recovery. Currently, the impact of communication systems is not considered in post-disaster distribution network recovery. Power faults are primarily addressed from the perspectives of network reconfiguration and fault recovery, prioritizing user importance. The distribution network recovery process is generally equated to two stages: network reconfiguration and fault recovery, and different methods are used to solve each stage, resulting in an overall optimized recovery plan. However, in actual grid recovery, network reconfiguration relies on the automated scheduling of the distribution network communication system, and fault recovery also depends on the communication system's ability to locate and isolate power faults. In the aftermath of extreme disasters, power and communication fault recovery in the distribution network are interdependent; finding a way to coordinate these two aspects is the research value of this invention. Therefore, the coordinated recovery strategy adopted in this invention includes: S4-1. Analyze the mutual conversion relationship between distribution network communication restoration and power fault restoration. With the goals of short power-side repair time and small power outage losses, and high communication-side coverage and high disaster loss statistics accuracy, establish a power-communication coordinated restoration model for the distribution network. S4-2. Decompose the post-disaster power distribution network system recovery process, and first propose a power-communication coordinated recovery strategy for the power distribution network with priority to communication recovery. S4-3. Based on the partial communication priority restoration in step S4-2, a power-communication coordinated restoration strategy for power-communication fault switching in the distribution network is further formulated; S4-4. Verify the rationality of the power-communication coordination recovery strategy for the distribution network formulated in step S4-3 using the IEEE 123-node example.

[0024] This invention analyzes the mechanism of power and communication failures in distribution networks caused by extreme disasters and explores the impact of communication system failures on power restoration in distribution networks. From the perspective of the distribution network communication system itself, it proposes an optimized restoration strategy for distribution network communication systems based on mobile self-organization. By combining various repair methods such as fiber optic repair, mobile base station repair, and emergency communication vehicles, the invention aims to quickly and effectively restore the distribution network communication system during disasters and proposes post-disaster repair principles applicable to distribution network communication systems.

[0025] This invention studies the communication methods of intelligent terminal units and enhances communication configuration redundancy by adding LoRa-based wireless communication self-organizing network technology, thereby improving the robustness of last-mile control in the power grid. Based on actual post-disaster needs and from the perspective of power load recovery, it proposes a coordinated recovery strategy for the power and communication systems of the distribution network under extreme disasters, aiming at short power-side repair time and minimal power outage losses, and high communication-side coverage and high accuracy of disaster loss statistics. Considering the coordinated recovery of power and communication can effectively shorten the post-disaster repair time of the distribution network and significantly reduce power outage losses caused by distribution network faults.

[0026] Obviously, the embodiments described above are merely some embodiments of this application, not all embodiments, and do not limit the patent scope of this application. This application can be implemented in many different forms; on the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this application.

Claims

1. A method for coordinated fault recovery of power distribution network and communication system under extreme disasters, characterized in that: This method is implemented based on the following steps: S1. Based on the characteristics of the distribution network communication system, construct a power-communication system model for the distribution network, and analyze the pathways and mechanisms by which extreme disasters cause distribution network faults; S2. Develop optimization and recovery strategies for distribution network communication systems based on mobile self-organization; S3. Develop a robustness improvement scheme for smart terminal communication based on LoRa wireless self-organizing network technology; S4. Develop coordinated recovery strategies for power distribution networks and communication systems under extreme disasters.

2. The method for coordinated recovery of power and communication systems in a distribution network under extreme disasters according to claim 1, characterized in that: The main forms of power failure in step S1 include pole collapse, wire breakage, and electrical faults; the main forms of communication system failure include wire breakage and failure of adjacent nodes due to damaged node capacity.

3. The method for coordinated recovery of power and communication systems in a distribution network under extreme disasters according to claim 1, characterized in that: Step S2 specifically includes the following: S2-1. Analyze the impact of communication system failures on distribution network restoration; after determining the location of the communication system failure, formulate an optimized restoration strategy for the mobile self-organizing distribution network communication system that combines multiple methods, including fiber optic repair, mobile base station repair, and emergency communication vehicles. S2-2. Establish a two-tiered objective for the restoration of the distribution network communication network after extreme disasters, and propose emergency repair principles for the distribution network communication network after extreme disasters.

4. The method for coordinated recovery of power and communication systems in a distribution network under extreme disasters according to claim 3, characterized in that: The two-layer objectives of step S2-2 include an upper-layer objective and a lower-layer objective. The upper-layer objective is to minimize the failure cost, and the lower-layer objective is to minimize the repair time.

5. The method for coordinated recovery of power and communication systems in a distribution network under extreme disasters according to claim 1, characterized in that: Step S4 specifically includes the following steps: S4-1. Analyze the mutual conversion relationship between distribution network communication restoration and power fault restoration. With the goals of short power-side repair time and small power outage losses, and high communication-side coverage and high disaster loss statistics accuracy, establish a power-communication coordinated restoration model for the distribution network. S4-2. Decompose the post-disaster power distribution network system recovery process, and first propose a power-communication coordinated recovery strategy for the power distribution network with priority to communication recovery. S4-3. Based on the partial communication priority restoration in step S4-2, a power-communication coordinated restoration strategy for power-communication fault transition in the distribution network is further formulated; S4-4. Verify the rationality of the power-communication coordination recovery strategy for the distribution network formulated in step S4-3 using the IEEE 123-node example.