Power communication network cooperative protection method and system based on OSU and ASON

Abstract

The invention relates to the technical field of electric power communication, in particular to an OSU and ASON-based electric power communication network cooperative protection method and system, and the method comprises the steps: dynamically configuring bandwidth resource granularity for different services, and building an electric layer optical service unit protection mechanism; performing lossless bandwidth adjustment on the abnormal service through an electric layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; configuring main and standby optical paths for various services based on the service bandwidth resource adjustment information, and determining whether to trigger an optical layer protection switching mechanism based on the real-time state of the main and standby optical paths and the protection state of the electric layer automatic switching optical network; and in response to an optical layer protection switching mechanism trigger signal, constructing and solving a photoelectric collaborative optimization model by taking minimization of photoelectric layer switching delay as an optimization target to obtain a photoelectric collaborative optimization protection strategy. By integrating the protection resources of the electric layer and the optical layer, the service can be quickly recovered when the fault occurs, and the continuity and the stability of the power communication network are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power communication, and in particular to a method and system for collaborative protection of a power communication network based on OSU and ASON. Background Art

[0002] With the acceleration of the digital transformation of the power industry, the reliability and efficiency of the power communication network, as an important support system for the operation of the power grid, are crucial to ensuring the safe and stable operation of the power grid. The existing power communication network mainly relies on the Optical Transport Network (OTN) and Automatically Switched Optical Network (ASON) technologies. However, with the increasing complexity of the network topology, the dynamic changes in business traffic, and the frequent occurrence of sudden failures, the traditional protection mechanism has gradually exposed some limitations. Specifically, although the optical layer 1+1 protection mechanism can provide higher reliability, it needs to reserve fixed wavelength resources, which is difficult to flexibly adapt to dynamically changing business needs, resulting in low resource utilization efficiency; while the protection mechanism based on the Optical Service Unit (OSU) at the electrical layer is relatively coarse in bandwidth adjustment granularity, and cannot achieve refined resource allocation. In addition, this protection mechanism cannot achieve millisecond-level fault recovery. When a fault occurs in the network, the service interruption time is long, which is difficult to meet the requirements of the power communication network for high reliability and low latency.

[0003] Therefore, the existing power communication network protection mechanism has many problems when dealing with complex network environments and diversified business needs. It is difficult to meet the power communication system's demand for efficient and reliable protection solutions, which seriously restricts the reliability and resource utilization efficiency of the power communication network. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method and system for coordinated protection of a power communication network based on OSU and ASON.

[0005] In a first aspect, the present invention provides a method for collaborative protection of a power communication network based on OSU and ASON, the method comprising the following steps: According to the priority and bandwidth requirements of various services in the power communication network, the bandwidth resource granularity is dynamically configured for different services, and an electrical layer optical service unit protection mechanism based on optical service units is established; Identify abnormal services when a fault occurs according to the electrical layer network status monitored in real time, and perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; Based on the power communication network topology and service bandwidth resource adjustment information, configure the primary and backup optical paths for various services, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; In response to the trigger signal of the optical layer protection switching mechanism, the optoelectronic layer switching delay is minimized as the optimization goal, and an optoelectronic collaborative optimization model is constructed according to the current network status and the real-time bandwidth requirements of the service; The optoelectronic collaborative optimization model is solved to obtain an optoelectronic collaborative optimization protection strategy, and the optoelectronic collaborative protection equipment in the power communication network is collaboratively dispatched and controlled according to the optoelectronic collaborative optimization protection strategy.

[0006] In a further implementation scheme, the steps of dynamically configuring bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network and establishing an electrical layer optical service unit protection mechanism based on optical service units include: Prioritize each type of power communication service and determine the priority coefficient corresponding to each type of power communication service; Real-time monitoring of bandwidth demand information of various types of power communication services, and calculation of actual allocated bandwidth based on the bandwidth demand information of various types of power communication services and the priority coefficient; Pre-establishing optical service unit protection connections for various types of power communication services in the electrical layer automatic switching optical network; the optical service unit protection connections include main optical service unit connections and protection optical service unit connections; According to the actual allocated bandwidth, bandwidth resources are configured for the optical service unit protection connection to obtain a primary connection bandwidth and a protection connection bandwidth; Based on the main connection bandwidth and the protection connection bandwidth, an electrical layer optical service unit protection mechanism based on optical service units is established in the electrical layer automatic switching optical network.

[0007] In a further embodiment, the step of identifying abnormal services when a fault occurs based on the real-time monitored electrical layer network status includes: Monitor the electrical layer network status in real time, and detect whether the electrical layer network has a fault according to the electrical layer network status; wherein the electrical layer network status includes the link status, node device status, service transmission status and fault detection signal in the electrical layer network; When a fault is detected in the electrical layer network, the fault location is determined based on the fault detection signal, and abnormal services are identified from the power communication services associated with the fault location based on the link status, node device status and service transmission status at the fault location.

[0008] In a further implementation scheme, the step of performing lossless bandwidth adjustment on the abnormal service through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information comprises: Identify the links that need to be protected in the electrical layer network according to the transmission path of the abnormal service and the location of the fault, form a set of protection links, and determine the bandwidth resources required for each abnormal service according to the current state and service priority of the abnormal service; Calculate the additional delay of each link caused by the bandwidth adjustment of the electrical-layer optical service unit protection mechanism according to the adjustment speed of the electrical-layer optical service unit protection mechanism and the physical characteristics of each link in the protection link set; According to the protection failure rate, blocking rate and resource utilization rate of each link in the protection link set, the link bandwidth adjustment cost is calculated; Lossless bandwidth adjustment is performed on each link in the protection link set according to the bandwidth resources required by the abnormal service, the link bandwidth adjustment cost and the additional delay to obtain service bandwidth resource adjustment information.

[0009] In a further implementation scheme, the step of configuring primary and backup optical paths for various services based on the power communication network topology and service bandwidth resource adjustment information includes: Analyze the optical layer topology of the power communication network, obtain the power communication network topology information, and construct the power communication network topology model based on the power communication network topology information; Using the shortest path algorithm, a main optical path from a source node to a sink node that satisfies the service bandwidth resource adjustment information and the shortest delay requirements is found in the power communication network topology model; In the power communication network topology model, a path with no overlapping links or nodes with the main optical path is found as the backup optical path.

[0010] In a further implementation scheme, in the process of configuring primary and backup optical paths for various types of services, the main optical path and the backup optical path are configured as the same wavelength resources, and wavelength resources that meet wavelength continuity constraints are reserved for the primary and backup optical paths of each power communication service in the power communication network.

[0011] In a further embodiment, the step of determining whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status includes: Real-time monitoring of the primary and backup optical paths and the electrical layer automatic switching optical network to obtain the real-time status of the primary and backup optical paths and the protection status of the electrical layer automatic switching optical network; Detecting the electrical layer allocation bandwidth of the primary and backup optical paths according to the real-time status of the primary and backup optical paths, and determining that the electrical layer protection fails when the electrical layer allocation bandwidth of the primary and backup optical paths does not meet the preset service protection requirement bandwidth; Detecting the remaining bandwidth of the electrical layer according to the protection state of the electrical layer automatic switching optical network, and determining that the remaining bandwidth resources of the electrical layer are insufficient when the remaining bandwidth of the electrical layer does not meet the preset service protection requirement bandwidth; When the electrical layer protection fails or the electrical layer remaining bandwidth resources are insufficient, an optical layer protection switching mechanism is triggered.

[0012] In a further embodiment, the step of responding to the trigger signal of the optical layer protection switching mechanism, taking minimizing the optical layer switching delay as the optimization goal, and constructing the optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth demand of the service includes: After receiving the optical layer protection switching mechanism trigger signal, the current network state of the electric power communication network is obtained, and the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources are obtained according to the current network state; The optical layer protection cost of each link is calculated based on the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources; Calculating the electrical layer protection cost of each link according to the link bandwidth adjustment cost and the additional delay; Taking minimizing the switching delay of the photovoltaic layer as the optimization goal, a photovoltaic collaborative optimization model is constructed according to the optical layer protection cost and the electrical layer protection cost.

[0013] In a further embodiment, the optoelectronic collaborative optimization protection strategy is solved by a particle swarm algorithm.

[0014] In a second aspect, the present invention provides a power communication network collaborative protection system based on OSU and ASON, the system comprising: The protection establishment module is used to dynamically configure bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network, and establish an electrical layer optical service unit protection mechanism based on the optical service unit; The bandwidth adjustment module is used to identify abnormal services when a fault occurs according to the electrical layer network status monitored in real time, and to perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; An optical layer switching module is used to configure primary and backup optical paths for various services based on the power communication network topology and service bandwidth resource adjustment information, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; A model building module is used to respond to the trigger signal of the optical layer protection switching mechanism, take minimizing the optical layer switching delay as the optimization goal, and build an optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth requirements of the business; The collaborative protection module is used to solve the optoelectronic collaborative optimization model, obtain the optoelectronic collaborative optimization protection strategy, and perform collaborative dispatching and control of the optoelectronic collaborative protection equipment in the power communication network according to the optoelectronic collaborative optimization protection strategy.

[0015] The present invention provides an OSU- and ASON-based electric power communication network collaborative protection method and system. The method dynamically configures bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the electric power communication network, and establishes an electrical layer optical service unit protection mechanism based on optical service units; identifies abnormal services when a fault occurs according to the real-time monitored electrical layer network status, and performs lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; configures primary and backup optical paths for various services based on the electric power communication network topology and the service bandwidth resource adjustment information, and determines whether to trigger an optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; responds to an optical layer protection switching mechanism trigger signal, takes minimizing the optical layer switching delay as an optimization goal, and constructs an optoelectronic collaborative optimization model according to the current network status and the real-time bandwidth requirements of the service; solves the optoelectronic collaborative optimization model to obtain an optoelectronic collaborative optimization protection strategy, and performs collaborative dispatching and control of optoelectronic collaborative protection equipment in the electric power communication network according to the optoelectronic collaborative optimization protection strategy. Compared with the existing technology, this method dynamically integrates the protection resources of the electrical layer and the optical layer according to business priority and bandwidth requirements, realizes rapid recovery under network failure and optoelectronic coordinated optimization protection mechanism, so as to meet the requirements of power communication network for high reliability, flexibility and efficiency, and ensure the continuity and stability of the power communication network. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for collaborative protection of a power communication network based on OSU and ASON provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of an electrical layer optical service unit protection mechanism provided by an embodiment of the present invention; Figure 3 It is a block diagram of an OSU- and ASON-based power communication network collaborative protection system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following specifically illustrates the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and are not to be construed as limitations of the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute limitations on the scope of patent protection of the present invention, because many changes may be made to the present invention without departing from the spirit and scope of the present invention.

[0018] refer to Figure 1The embodiment of the present invention provides a collaborative protection method for a power communication network based on OSU and ASON, such as Figure 1 As shown, the method comprises the following steps: S1. Dynamically configure bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network, and establish an electrical layer optical service unit protection mechanism based on optical service units.

[0019] In some implementations, the step of dynamically configuring bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the electric power communication network and establishing an electrical layer optical service unit protection mechanism based on optical service units includes: Prioritize each type of power communication service and determine the priority coefficient corresponding to each type of power communication service; Real-time monitoring of bandwidth demand information of various types of power communication services, and calculation of actual allocated bandwidth based on the bandwidth demand information of various types of power communication services and the priority coefficient; Pre-establishing optical service unit protection connections for various types of power communication services in the electrical layer automatic switching optical network; the optical service unit protection connections include main optical service unit connections and protection optical service unit connections; According to the actual allocated bandwidth, bandwidth resources are configured for the optical service unit protection connection to obtain a primary connection bandwidth and a protection connection bandwidth; Based on the main connection bandwidth and the protection connection bandwidth, an electrical layer optical service unit protection mechanism based on optical service units is established in the electrical layer automatic switching optical network.

[0020] Specifically, this embodiment analyzes various types of services in the electric power communication network, and divides the services into different priorities, such as high priority, medium priority and low priority, according to the importance of the services and the sensitivity to delay and bandwidth. A priority coefficient is assigned to each priority according to the divided priority level. The larger the value of the priority coefficient, the more priority the service is given when allocating bandwidth, and relatively more bandwidth resources can be obtained to meet its high priority needs. At the same time, this embodiment monitors the bandwidth demand information of various types of services in real time through the bandwidth monitoring equipment in the electric power communication network, and calculates the actual allocated bandwidth according to the monitored bandwidth demand information and the service priority coefficient. The calculation formula for the actual allocated bandwidth is: In the formula, The actual allocated bandwidth for the ith service; is the priority coefficient of the ith service, ; The bandwidth required for the i-th service.

[0021] Then, this embodiment uses the lossless bandwidth adjustment capability of the optical service unit and the fine bandwidth granularity of 2.6Mb / s to pre-configure the OSU protection bandwidth granularity for various services when the service bandwidth demand is low and unstable. In the Advanced Network (ASON), an optical service unit (OSU) protection connection is pre-established for various services. The optical service unit protection connection includes a primary OSU connection and a protection OSU connection. The primary connection bandwidth and the protection connection bandwidth are configured for the optical service unit protection connection in a certain proportion according to the calculated actual allocated bandwidth. According to the bandwidth allocation result, the bandwidth of the primary OSU connection and the protection OSU connection is determined. Based on the primary connection bandwidth and the protection connection bandwidth, the protection strategy of the OSU-P protection mechanism, such as the fault switching strategy and the bandwidth recovery strategy, is configured. The electrical layer optical service unit protection mechanism (OSU-P protection mechanism) is implemented in the electrical layer ASON to ensure that when a service fails, it can quickly switch to the protection connection and restore service transmission. The electrical layer optical service unit protection mechanism can efficiently utilize network resources, ensure the reliability and stability of various services, and provide a strong guarantee for the stable operation of the power communication network.

[0022] S2. Identify abnormal services when a fault occurs based on the real-time monitored electrical layer network status, and perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information.

[0023] In some implementations, the step of identifying abnormal services when a fault occurs based on the electrical layer network status monitored in real time includes: Monitor the electrical layer network status in real time, and detect whether the electrical layer network has a fault according to the electrical layer network status; wherein the electrical layer network status includes the link status, node device status, service transmission status and fault detection signal in the electrical layer network; When a fault is detected in the electrical layer network, the fault location is determined based on the fault detection signal, and abnormal services are identified from the power communication services associated with the fault location based on the link status, node device status and service transmission status at the fault location.

[0024] Specifically, this embodiment collects the link status, node device status, service transmission status and fault detection signal of the electrical layer network in real time through sensors and monitoring equipment deployed in the network to form the electrical layer network status, and analyzes the collected electrical layer network status through preset thresholds to determine whether the electrical layer network is in a normal state. When it is found that any data in the link status, node device status, service transmission status and fault detection signal exceeds the threshold, the fault alarm mechanism is triggered. For example, when the bit error rate of the link exceeds the corresponding preset threshold or the node device sends a fault alarm, it is determined that a fault occurs in the electrical layer network. This embodiment determines the location of the fault based on the fault detection signal, and combines the link status, node device status and service transmission status at the fault location. Find out the affected abnormal services from the power communication services associated with the fault location. For example, for the services passing through the faulty link, if their transmission is interrupted or the quality is seriously degraded, they will be identified as abnormal services. It should be noted that when a fault occurs in the electrical layer network, the electrical layer optical service unit protection mechanism (OSU-P protection mechanism) can quickly restore the bandwidth resources of the affected services by dynamically adjusting the bandwidth strategy. The OSU technology has a lossless bandwidth adjustment function, which not only ensures the integrity of the data during the fault recovery process, avoids the risk of data loss, and significantly reduces the pressure of resource competition. For services of different priorities, the OSU-P protection mechanism dynamically adjusts the bandwidth to ensure that high-priority services obtain more reliable bandwidth, such as Figure 2 As shown in Figure 1, the OSU-P protection mechanism pre-establishes a smaller OSU protection connection bandwidth for customer services. After a fault occurs, the OSU connection on the protection path quickly adjusts the initial bandwidth to the bandwidth required by the service through a lossless bandwidth adjustment mechanism, and performs protection switching simultaneously. Since the protection connection only reserves limited bandwidth resources in the initial stage, the OSU-P protection mechanism can save a large amount of network protection resources. In some implementations, the step of performing lossless bandwidth adjustment on the abnormal service through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information includes: Identify the links that need to be protected in the electrical layer network according to the transmission path of the abnormal service and the location of the fault, form a set of protection links, and determine the bandwidth resources required for each abnormal service according to the current state and service priority of the abnormal service; Calculate the additional delay of each link caused by the bandwidth adjustment of the electrical-layer optical service unit protection mechanism according to the adjustment speed of the electrical-layer optical service unit protection mechanism and the physical characteristics of each link in the protection link set; According to the protection failure rate, blocking rate and resource utilization rate of each link in the protection link set, the link bandwidth adjustment cost is calculated; Lossless bandwidth adjustment is performed on each link in the protection link set according to the bandwidth resources required by the abnormal service, the link bandwidth adjustment cost and the additional delay to obtain service bandwidth resource adjustment information.

[0025] Specifically, this embodiment identifies the links that need to be protected in the electrical layer network according to the transmission path of the abnormal service and the location of the fault, and aggregates them to form a protection link set, and comprehensively considers the current state and service priority of the abnormal service to determine the bandwidth resources required for each abnormal service after the fault occurs. Since the physical characteristics of different links (such as link length, transmission medium, etc.) will affect the signal transmission delay, this embodiment combines the physical characteristic parameters of each link (such as length, attenuation, etc.) to calculate the additional delay caused by bandwidth adjustment of each link. At the same time, this embodiment comprehensively considers factors such as protection failure rate, blocking rate and resource utilization rate to calculate the link bandwidth adjustment cost, wherein the protection failure rate reflects the probability of protection failure of the link during the protection process; the blocking rate indicates the probability that the link is occupied by other services and cannot provide the required bandwidth; the resource utilization rate reflects the current bandwidth usage of the link, and the link bandwidth adjustment cost comprehensively reflects the cost and risk required to adjust the bandwidth on the link. This embodiment designs an electrical layer network protection solution that can restore more services while minimizing resource waste and the number of bandwidth adjustments based on the OSU small-granular bandwidth and lossless adjustment characteristics. The electrical layer protection cost objective function is specifically expressed as: in, In the formula, considering that the electrical layer uses OSU technology to achieve lossless bandwidth dynamic adjustment, the set of protection links involved in the electrical layer protection process is Q. For each protection link in the electrical layer ; Cost of electrical layer protection; is the delay weight; The additional delay caused by adjusting the bandwidth of link q due to the protection mechanism of the electrical layer optical service unit; Adjust weights for link bandwidth; is the link bandwidth adjustment cost; Q is the set of protected links; is the blocking rate weight coefficient; is the blocking rate; is the resource utilization weight coefficient; for resource utilization; To protect the failure rate.

[0026] When adjusting the bandwidth, this embodiment fully considers the bandwidth resources required by the abnormal service, the link bandwidth adjustment cost and the additional delay, and performs lossless bandwidth adjustment on each link in the protection link set. For example, for links with low bandwidth adjustment cost and small additional delay, they can be preferentially selected for bandwidth adjustment to meet the bandwidth demand of the abnormal service; while for links with high bandwidth adjustment cost or large additional delay, they need to be adjusted with caution to avoid a significant impact on network performance. Finally, according to the bandwidth adjustment results of each link, complete service bandwidth resource adjustment information is formed, which records in detail the bandwidth allocation of each abnormal service in the protection link set, as well as the corresponding adjustment strategies and parameters. To provide a basis for subsequent business recovery and network optimization, in summary, this embodiment is based on the small-granularity bandwidth adjustment capability and lossless bandwidth adjustment advantages of OSU technology to achieve a network protection solution that can restore more services while minimizing resource waste and bandwidth adjustment times. The OSU-P protection mechanism is used to pre-establish a smaller OSU protection connection bandwidth for customer services, and quickly adjust the bandwidth to business requirements after a failure occurs. By dynamically adjusting the bandwidth of the OSU connection, the affected abnormal services are quickly restored to other normal links, and no data is lost during the adjustment process. Finally, the service bandwidth resource adjustment information is obtained, ensuring the continuity and reliability of the power communication service.

[0027] S3. Based on the power communication network topology and service bandwidth resource adjustment information, configure the primary and backup optical paths for various services, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status.

[0028] In some implementations, the step of configuring primary and backup optical paths for various services based on the power communication network topology and service bandwidth resource adjustment information includes: Analyze the optical layer topology of the power communication network, obtain the power communication network topology information, and construct the power communication network topology model based on the power communication network topology information; Using the shortest path algorithm, a main optical path from a source node to a sink node that satisfies the service bandwidth resource adjustment information and the shortest delay requirements is found in the power communication network topology model; In the power communication network topology model, a path with no overlapping links or nodes with the main optical path is found as the backup optical path.

[0029] This embodiment configures a primary and backup path for each service by establishing an optical layer 1+1 protection mechanism. The service is transmitted and received through two optical paths. When the electrical layer protection fails, it is switched to the optical layer protection based on the automatic switching optical network to ensure high-reliability transmission of key services. The specific process is to parse the optical layer topology structure of the power communication network, obtain the location of all nodes in the power communication network, the connection relationship of the optical fiber link, and the wavelength resource distribution information, form the power communication network topology information, and organize the collected power communication network topology information. The graph structure in graph theory is used to construct a power communication network topology model. The model It should be able to accurately reflect the physical structure and resource distribution of the network, where nodes represent various sites in the power communication network, edges represent optical fiber links between nodes, and the weights on the edges can represent attributes such as link bandwidth and delay. This embodiment determines the required transmission service bandwidth and delay requirements based on the service bandwidth resource adjustment information. In the power communication network topology model, this embodiment uses the source node and the sink node as the starting point and the end point. The shortest path algorithm such as the Dijkstra algorithm calculates the shortest path from the source node to the sink node with the delay as the weight, and finds the main optical path that meets the service bandwidth resource adjustment information and the shortest delay requirements. In the search process, the bandwidth resources, delay characteristics and service priorities of the link are comprehensively considered to ensure that the selected path can provide reliable transmission guarantee for the service, so as to find the optimal path. At the same time, in the power communication network topology model, this embodiment searches for a path with no overlapping links or nodes with the main optical path as the backup optical path. This ensures that when the main optical path fails, the backup optical path can independently undertake the service transmission task and improve the reliability of the network. When searching for the backup optical path, this embodiment can adopt an algorithm similar to that for searching the main optical path, but in the path selection process, this embodiment compares the main optical path with the backup optical path. The paths are configured as the same wavelength resources, which can facilitate rapid switching between the primary and backup paths, reduce the complexity and time delay during switching, and at the same time, to ensure that the backup optical path can work normally when the main optical path fails, the backup optical path should have no overlapping links or nodes with the main optical path, and the primary and backup optical paths should be configured as the same wavelength resources to ensure that there is no need to change the wavelength during switching. In addition, this embodiment should reserve wavelength resources that meet the wavelength continuity constraints for the primary and backup optical paths of each power communication service in the power communication network, ensure that there will be no conflicts and discontinuities in wavelength allocation, and ensure the stability and continuity of service transmission.

[0030] In some implementations, the step of determining whether to trigger an optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status includes: Real-time monitoring of the primary and backup optical paths and the electrical layer automatic switching optical network to obtain the real-time status of the primary and backup optical paths and the protection status of the electrical layer automatic switching optical network; Detecting the electrical layer allocation bandwidth of the primary and backup optical paths according to the real-time status of the primary and backup optical paths, and determining that the electrical layer protection fails when the electrical layer allocation bandwidth of the primary and backup optical paths does not meet the preset service protection requirement bandwidth; Detecting the remaining bandwidth of the electrical layer according to the protection state of the electrical layer automatic switching optical network, and determining that the remaining bandwidth resources of the electrical layer are insufficient when the remaining bandwidth of the electrical layer does not meet the preset service protection requirement bandwidth; When the electrical layer protection fails or the electrical layer remaining bandwidth resources are insufficient, an optical layer protection switching mechanism is triggered.

[0031] Specifically, this embodiment deploys real-time monitoring equipment in the network to monitor the main and backup optical paths and the electrical layer automatic switching optical network in real time. The monitoring equipment collects the real-time status of the main and backup optical paths (such as bandwidth occupancy, optical signal quality, etc.) and the protection status of the electrical layer automatic switching optical network (such as remaining bandwidth, protection path status, etc.). This embodiment compares the electrical layer allocated bandwidth of the main and backup optical paths. Bandwidth required for business protection When the electrical layer allocation bandwidth of the primary and backup optical paths does not meet the preset service protection requirement bandwidth, it is determined that the electrical layer protection fails, which is specifically expressed as: In the formula, It is the electric layer protection failure judgment variable. When its value is True, it means the electric layer protection fails. Allocate bandwidth to the electrical layer; The bandwidth required for business protection is the minimum bandwidth required for normal business operation.

[0032] This embodiment obtains the remaining bandwidth of the electrical layer automatic switching optical network and compares the remaining bandwidth of the electrical layer Bandwidth required for business protection When the remaining bandwidth is insufficient to meet the future service protection requirements (that is, the remaining bandwidth is less than or equal to the future required bandwidth), it is determined that the remaining bandwidth resources of the electrical layer are insufficient, which is specifically expressed as: In the formula, It is the remaining bandwidth of the electrical layer, that is, the bandwidth resources that have not been allocated or used in the electrical layer network.

[0033] When any of the following conditions is met: electrical layer protection failure or insufficient electrical layer remaining bandwidth, the optical layer protection switching mechanism is triggered. The service is switched from the electrical layer protection path to the optical layer protection path through the optical layer protection switching mechanism to ensure service continuity and reliability. The conditions for triggering the optical layer protection switching mechanism are specifically expressed as follows: In the formula, It is a logical judgment variable for triggering the optical layer protection switching mechanism. When its value is True, it means that the optical layer protection switching mechanism needs to be triggered.

[0034] S4. In response to the trigger signal of the optical layer protection switching mechanism, an optoelectronic collaborative optimization model is constructed according to the current network status and the real-time bandwidth requirements of the service, with minimizing the optoelectronic layer switching delay as the optimization goal.

[0035] S5. Solve the optoelectronic collaborative optimization model to obtain the optoelectronic collaborative optimization protection strategy, and perform collaborative dispatch control on the optoelectronic collaborative protection equipment in the power communication network according to the optoelectronic collaborative optimization protection strategy.

[0036] In some embodiments, the step of responding to the trigger signal of the optical layer protection switching mechanism, taking minimizing the optical layer switching delay as the optimization goal, and constructing the optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth demand of the service includes: After receiving the optical layer protection switching mechanism trigger signal, the current network state of the electric power communication network is obtained, and the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources are obtained according to the current network state; The optical layer protection cost of each link is calculated based on the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources; Calculating the electrical layer protection cost of each link according to the link bandwidth adjustment cost and the additional delay; Taking minimizing the switching delay of the photovoltaic layer as the optimization goal, a photovoltaic collaborative optimization model is constructed according to the optical layer protection cost and the electrical layer protection cost.

[0037] Specifically, to ensure high-reliability transmission of key services, this embodiment adopts an optical layer 1+1 protection mechanism, which configures a primary and backup optical path for each service. Service data is sent and received selectively through two optical paths at the same time. When the OAM (Operation Administration and Control) in the power communication network When the ASON protection failure at the electrical layer or the main path failure at the optical layer is detected by the Operation Management and Maintenance system, the optical layer protection switching mechanism signal is immediately triggered based on the automatic switching optical network. This trigger signal indicates that the current electrical layer protection mechanism cannot meet the business requirements and that optoelectronic coordinated protection switching is required to ensure high reliability transmission of key services. This embodiment reallocates network resources through the optical layer 1+1 protection mechanism. This process is usually completed within milliseconds, which is sufficient to meet the services with strict delay requirements such as power communication. After receiving the trigger signal, this embodiment obtains the current status information of the power communication network through the network management system. The current status information of the power communication network includes data such as the transmission delay, bandwidth consumption and remaining wavelength resources of each link. The transmission delay, bandwidth consumption cost and remaining wavelength resources of each link are obtained according to the current status information of the power communication network, and the optical layer protection cost function is used to calculate the optical layer protection cost of each link. This embodiment assumes that all possible optical paths in the network constitute a candidate set P, and each path p∈P is composed of several links i. The specific expression of the optical layer protection cost function is: Among them, for optical layer 1+1 protection, the reserved wavelength resources must meet the service requirements, so the wavelength resources required by the service are This embodiment introduces a wavelength protection penalty function to prevent insufficient resource allocation. The wavelength protection penalty function is specifically: In the formula, Cost of protecting the light layer; is the delay weight; is the bandwidth cost weight; is the wavelength protection cost weight; for each link i in path p, is the transmission delay of link i; is the bandwidth consumption cost of link i; is the remaining wavelength resource on link i; wavelength resources for business needs; is the wavelength protection penalty function; A very small positive number to prevent division by zero.

[0038] At the same time, this embodiment uses the electrical layer protection cost formula to calculate the electrical layer protection cost of each link according to the link bandwidth adjustment cost and additional delay. The electrical layer protection cost reflects the cost of adjusting the link bandwidth to meet business needs under the electrical layer protection mechanism. The electrical layer protection cost includes the additional delay and resource occupation caused by the adjustment. Then, minimizing the optoelectronic layer switching delay is taken as the optimization goal, aiming to reduce the service interruption time during the optoelectronic layer switching process and ensure that the impact on existing services is minimized as much as possible during the switching process. This embodiment integrates the calculated optical layer protection cost and electrical layer protection cost into the optoelectronic collaborative optimization model, constructs the objective function of the optoelectronic collaborative optimization model, and seeks a protection strategy that minimizes the optoelectronic layer switching delay while meeting business needs. The calculation formula of the objective function of the optoelectronic collaborative optimization model is: Where P is the candidate set of all possible optical paths; Q is the set of protection links; In order to adjust the weight of optical layer protection and electrical layer OSU protection in the overall cost, .

[0039] The constraints of the optoelectronic collaborative optimization model in this embodiment ensure that the resource allocation of each link i meets the requirements, that is, , and the wavelength continuity must be satisfied on the path, that is, there is a wavelength Applies to the entire path, i.e. In this embodiment, the optoelectronic coordinated optimization based on ASON (Automatic Switched Optical Network) is combined with the electrical layer OSU-P protection and the optical layer 1+1 protection through dynamic routing and intelligent resource scheduling to realize flexible scheduling and resource optimization of multiple service types. The OSU-P protection mechanism of the electrical layer ASON is used to give priority to protecting high-priority services, realize fast switching, lossless bandwidth adjustment and accurate protection of low bit rate services. At the same time, when the electrical layer resources are insufficient or the protection fails, the protection mechanism of the optical layer ASON (such as optical layer 1+1 protection) is switched to provide redundant backup to ensure uninterrupted services. Finally, the optoelectronic switching strategy is realized. When the electrical layer ASON cannot meet the service protection requirements, the optical layer ASON protection is triggered to ensure smooth transition of the protection mechanism and uninterrupted services. In this embodiment, In the embodiment, the goal of optoelectronic collaborative optimization is to significantly improve network reliability through a double-layer protection mechanism, give priority to electrical layer protection to ensure the transmission reliability of multiple services, and realize dynamic allocation of optoelectronic layer resources in resource scheduling, reduce resource waste, and improve the bandwidth utilization of the overall network. By optimizing switching paths and resource allocation, the delay in the optoelectronic layer switching process and the impact on existing services are minimized, thereby realizing an efficient, reliable and flexible network protection solution. Dynamic switching between different protection mechanisms is achieved through optoelectronic collaborative optimization. The system solves the above joint optimization problem according to the current network status, business needs and resource conditions, and selects the optimal optical path p* and the corresponding electrical layer protection adjustment plan q* to simultaneously meet the requirements of low latency, low cost and sufficient wavelength resources.

[0040] For the objective function of the optoelectronic collaborative optimization model, the entire problem can be regarded as a mixed integer nonlinear programming (MINLP) problem or a combinatorial optimization problem. This embodiment uses a particle swarm algorithm to solve it. When a link failure occurs, the final service protection method is determined. Through optoelectronic collaboration, the system can quickly switch to optical layer resources when electrical layer resources are insufficient. This strategy can provide more fine-grained service protection, adapt to more diverse business needs, improve network flexibility, and achieve more efficient dual-layer service protection.

[0041] The embodiment of the present invention provides a collaborative protection method for an electric power communication network based on OSU and ASON, the method comprising dynamically configuring bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the electric power communication network, and establishing an electrical layer optical service unit protection mechanism based on optical service units; identifying abnormal services when a fault occurs according to the real-time monitored electrical layer network status, and performing lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; configuring primary and backup optical paths for various services based on the electric power communication network topology and the service bandwidth resource adjustment information, and determining whether to trigger an optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; in response to an optical layer protection switching mechanism trigger signal, constructing an optoelectronic collaborative optimization model according to the current network status and the real-time bandwidth requirements of the service with minimizing the optoelectronic layer switching delay as the optimization goal; solving the optoelectronic collaborative optimization model to obtain an optoelectronic collaborative optimization protection strategy, and performing collaborative scheduling control on optoelectronic collaborative protection devices in the electric power communication network according to the optoelectronic collaborative optimization protection strategy. Compared with the existing technology, this method dynamically integrates the protection resources of the electrical layer and the optical layer according to business priority and bandwidth requirements, realizes rapid recovery under network failure and optoelectronic coordinated optimization protection mechanism, so as to meet the requirements of power communication network for high reliability, flexibility and efficiency, and ensure the continuity and stability of the power communication network.

[0042] It should be noted that the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0043] In one embodiment, Figure 3 As shown, an embodiment of the present invention provides a power communication network collaborative protection system based on OSU and ASON, and the system includes: The protection establishment module 101 is used to dynamically configure bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network, and establish an electrical layer optical service unit protection mechanism based on the optical service unit; The bandwidth adjustment module 102 is used to identify abnormal services when a fault occurs according to the electrical layer network status monitored in real time, and to perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; The optical layer switching module 103 is used to configure the primary and backup optical paths for various services based on the power communication network topology and the service bandwidth resource adjustment information, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; The model building module 104 is used to respond to the trigger signal of the optical layer protection switching mechanism, take minimizing the optical-electrical layer switching delay as the optimization goal, and build an optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth requirements of the service; The collaborative protection module 105 is used to solve the optoelectronic collaborative optimization model, obtain the optoelectronic collaborative optimization protection strategy, and perform collaborative dispatch control on the optoelectronic collaborative protection equipment in the power communication network according to the optoelectronic collaborative optimization protection strategy.

[0044] For the specific definition of a collaborative protection system for an electric power communication network based on OSU and ASON, please refer to the above-mentioned definition of a collaborative protection method for an electric power communication network based on OSU and ASON, which will not be repeated here. A person of ordinary skill in the art can appreciate that the various modules and steps described in conjunction with the embodiments disclosed in this application can be implemented in hardware, software, or a combination of both. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0045] The embodiment of the present invention provides a power communication network collaborative protection system based on OSU and ASON. The protection establishment module of the system dynamically configures bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network, and establishes an electrical layer optical service unit protection mechanism based on the optical service unit; the bandwidth adjustment module identifies the abnormal service when a fault occurs according to the real-time monitored electrical layer network status, and performs lossless bandwidth adjustment on the abnormal service through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; the optical layer switching module configures the main and backup optical paths for various services based on the power communication network topology and the service bandwidth resource adjustment information, and determines whether to trigger the optical layer protection switching mechanism based on the real-time status of the main and backup optical paths and the electrical layer automatic switching optical network protection status; the model construction module responds to the optical layer protection switching mechanism trigger signal, takes minimizing the optical and electrical layer switching delay as the optimization goal, and constructs an optoelectronic collaborative optimization model according to the current network status and the real-time bandwidth requirements of the service; the collaborative protection module solves the optoelectronic collaborative optimization model to obtain the optoelectronic collaborative optimization protection strategy, and performs collaborative dispatching and control on the optoelectronic collaborative protection equipment in the power communication network according to the optoelectronic collaborative optimization protection strategy. Compared with the existing technology, this system dynamically integrates the protection resources of the electrical and optical layers according to business priorities and bandwidth requirements, realizes rapid recovery under network failures and optoelectronic coordinated optimization protection mechanism, so as to meet the requirements of power communication networks for high reliability, flexibility and efficiency, and ensure the continuity and stability of power communication networks.

[0046] The above-mentioned embodiments only express several preferred implementation modes of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in the technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be based on the protection scope of the claims.

Claims

1. A collaborative protection method for power communication network based on OSU and ASON, characterized in that: The following steps are involved: According to the priority and bandwidth requirements of various services in the power communication network, the bandwidth resource granularity is dynamically configured for different services, and an electrical layer optical service unit protection mechanism based on optical service units is established; Identify abnormal services when a fault occurs according to the electrical layer network status monitored in real time, and perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; Based on the power communication network topology and service bandwidth resource adjustment information, configure the primary and backup optical paths for various services, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; In response to the trigger signal of the optical layer protection switching mechanism, the optoelectronic layer switching delay is minimized as the optimization goal, and an optoelectronic collaborative optimization model is constructed according to the current network status and the real-time bandwidth requirements of the service; The optoelectronic collaborative optimization model is solved to obtain an optoelectronic collaborative optimization protection strategy, and the optoelectronic collaborative protection equipment in the power communication network is collaboratively dispatched and controlled according to the optoelectronic collaborative optimization protection strategy.

2. The method for collaborative protection of a power communication network based on OSU and ASON as claimed in claim 1, characterized in that: The steps of dynamically configuring bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the electric power communication network and establishing an electrical layer optical service unit protection mechanism based on optical service units include: Prioritize each type of power communication service and determine the priority coefficient corresponding to each type of power communication service; Real-time monitoring of bandwidth demand information of various types of power communication services, and calculation of actual allocated bandwidth based on the bandwidth demand information of various types of power communication services and the priority coefficient; Pre-establishing optical service unit protection connections for various types of power communication services in the electrical layer automatic switching optical network; the optical service unit protection connections include main optical service unit connections and protection optical service unit connections; According to the actual allocated bandwidth, bandwidth resources are configured for the optical service unit protection connection to obtain a primary connection bandwidth and a protection connection bandwidth; Based on the main connection bandwidth and the protection connection bandwidth, an electrical layer optical service unit protection mechanism based on optical service units is established in the electrical layer automatic switching optical network.

3. The method for collaborative protection of a power communication network based on OSU and ASON as claimed in claim 1, characterized in that: The step of identifying abnormal services when a fault occurs according to the electrical layer network status monitored in real time includes: Monitor the electrical layer network status in real time, and detect whether the electrical layer network has a fault according to the electrical layer network status; wherein the electrical layer network status includes the link status, node device status, service transmission status and fault detection signal in the electrical layer network; When a fault is detected in the electrical layer network, the fault location is determined based on the fault detection signal, and abnormal services are identified from the power communication services associated with the fault location based on the link status, node device status and service transmission status at the fault location.

4. The method for collaborative protection of a power communication network based on OSU and ASON as claimed in claim 1, characterized in that: The step of performing lossless bandwidth adjustment on the abnormal service through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information comprises: Identify the links that need to be protected in the electrical layer network according to the transmission path of the abnormal service and the location of the fault, form a set of protection links, and determine the bandwidth resources required for each abnormal service according to the current state and service priority of the abnormal service; Calculate the additional delay of each link caused by the bandwidth adjustment of the electrical-layer optical service unit protection mechanism according to the adjustment speed of the electrical-layer optical service unit protection mechanism and the physical characteristics of each link in the protection link set; According to the protection failure rate, blocking rate and resource utilization rate of each link in the protection link set, the link bandwidth adjustment cost is calculated; Lossless bandwidth adjustment is performed on each link in the protection link set according to the bandwidth resources required by the abnormal service, the link bandwidth adjustment cost and the additional delay to obtain service bandwidth resource adjustment information.

5. The method for collaborative protection of a power communication network based on OSU and ASON as claimed in claim 1, characterized in that: The step of configuring the primary and backup optical paths for various services based on the power communication network topology and the service bandwidth resource adjustment information includes: Analyze the optical layer topology of the power communication network, obtain the power communication network topology information, and construct the power communication network topology model based on the power communication network topology information; Using the shortest path algorithm, a main optical path from a source node to a sink node that satisfies the service bandwidth resource adjustment information and the shortest delay requirements is found in the power communication network topology model; In the power communication network topology model, a path with no overlapping links or nodes with the main optical path is found as the backup optical path.

6. The method for coordinated protection of a power communication network based on OSU and ASON as claimed in claim 5, characterized in that: In the process of configuring primary and backup optical paths for various services, the primary and backup optical paths are configured with the same wavelength resources, and wavelength resources that meet wavelength continuity constraints are reserved for the primary and backup optical paths of each power communication service in the power communication network.

7. The method for coordinated protection of a power communication network based on OSU and ASON as claimed in claim 1, characterized in that: The step of determining whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status comprises: Real-time monitoring of the primary and backup optical paths and the electrical layer automatic switching optical network to obtain the real-time status of the primary and backup optical paths and the protection status of the electrical layer automatic switching optical network; Detecting the electrical layer allocation bandwidth of the primary and backup optical paths according to the real-time status of the primary and backup optical paths, and determining that the electrical layer protection fails when the electrical layer allocation bandwidth of the primary and backup optical paths does not meet the preset service protection requirement bandwidth; Detecting the remaining bandwidth of the electrical layer according to the protection state of the electrical layer automatic switching optical network, and determining that the remaining bandwidth resources of the electrical layer are insufficient when the remaining bandwidth of the electrical layer does not meet the preset service protection requirement bandwidth; When the electrical layer protection fails or the electrical layer remaining bandwidth resources are insufficient, an optical layer protection switching mechanism is triggered.

8. The method for coordinated protection of a power communication network based on OSU and ASON as claimed in claim 4, characterized in that: The step of responding to the trigger signal of the optical layer protection switching mechanism, taking minimizing the optical layer switching delay as the optimization goal, and constructing the optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth demand of the service includes: After receiving the optical layer protection switching mechanism trigger signal, the current network state of the electric power communication network is obtained, and the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources are obtained according to the current network state; The optical layer protection cost of each link is calculated based on the link transmission delay, link bandwidth consumption cost and link remaining wavelength resources; Calculating the electrical layer protection cost of each link according to the link bandwidth adjustment cost and the additional delay; Taking minimizing the switching delay of the photovoltaic layer as the optimization goal, a photovoltaic collaborative optimization model is constructed according to the optical layer protection cost and the electrical layer protection cost.

9. The method for coordinated protection of a power communication network based on OSU and ASON as claimed in claim 8, characterized in that: The photoelectric collaborative optimization protection strategy is solved by a particle swarm algorithm.

10. A power communication network collaborative protection system based on OSU and ASON, characterized in that: The system comprises: The protection establishment module is used to dynamically configure bandwidth resource granularity for different services according to the priority and bandwidth requirements of various services in the power communication network, and establish an electrical layer optical service unit protection mechanism based on the optical service unit; The bandwidth adjustment module is used to identify abnormal services when a fault occurs according to the electrical layer network status monitored in real time, and to perform lossless bandwidth adjustment on the abnormal services through the electrical layer optical service unit protection mechanism to obtain service bandwidth resource adjustment information; An optical layer switching module is used to configure primary and backup optical paths for various services based on the power communication network topology and service bandwidth resource adjustment information, and determine whether to trigger the optical layer protection switching mechanism based on the real-time status of the primary and backup optical paths and the electrical layer automatic switching optical network protection status; A model building module is used to respond to the trigger signal of the optical layer protection switching mechanism, take minimizing the optical layer switching delay as the optimization goal, and build an optical-electrical collaborative optimization model according to the current network status and the real-time bandwidth requirements of the business; The collaborative protection module is used to solve the optoelectronic collaborative optimization model, obtain the optoelectronic collaborative optimization protection strategy, and perform collaborative dispatching and control of the optoelectronic collaborative protection equipment in the power communication network according to the optoelectronic collaborative optimization protection strategy.

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