CN114200901A - Digital twin oriented virtual power plant communication fault monitoring and control enhancement method - Google Patents
Digital twin oriented virtual power plant communication fault monitoring and control enhancement method Download PDFInfo
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Abstract
The invention provides a digital twin oriented virtual power plant communication fault monitoring and control enhancement method, which comprises the following steps: s1, designing a virtual power plant communication network system architecture based on the digital twin; according to the multi-level service requirements of the virtual power plant, a digital twin virtual power plant communication system architecture is divided into a sensing layer, an access layer, a backbone layer, a control center and a scheduling center, a 5G-based virtual power plant communication network is constructed, and transaction operation of the virtual power plant and two-level coordination control of the virtual power plant are achieved; step S2, identifying and positioning communication faults based on communication protocol behavior monitoring; step S3, adopting a communication control enhancement method for the 5G time delay perception problem of the virtual power plant, wherein the method comprises the following steps: the method has the advantages that the air interface access time delay is reduced, the time delay forwarding of a bearer network is reduced, the time delay of a core network is reduced, network slicing is realized based on NFV and SDN, and the communication quality guarantee is provided by using an end-to-end 5G network slicing technology; the invention can design a network slicing method aiming at a virtual power plant communication system.
Description
Technical Field
The invention relates to the technical field of virtualization, in particular to a digital twin oriented virtual power plant communication fault monitoring and control enhancing method.
Background
The operation of the virtual power plant needs to realize the aggregation and coordination optimization of the distributed power sources by means of a communication technology, wherein a communication system plays an important role in the source-network-load-storage coordination control of the virtual power plant, needs to transmit a large amount of acquisition, monitoring and control data, and requires the high reliability and low time delay of the communication system, so that the advanced communication technology is very important for realizing the coordination optimization of VPP.
The virtual power plant requires a high-speed, bidirectional, broadband and autonomous communication system, supports flexible access of multiple services, provides a plug-and-play virtual power plant information communication guarantee, and has wide floating range on the requirements of bandwidth, real-time performance, reliability and safety of the communication system. Existing physical devices and communication protocols are not fully satisfied in many aspects of virtual power plant complex applications.
In order to realize the coordination optimization between the internal DER and the VPP, an advanced communication technology is crucial, and a bidirectional communication channel is established between the control center and each unit in the area to ensure the quality of data transmission. The virtual power plant regulation and control functions all depend on a communication network to realize data transmission, most of data relates to collection, state monitoring and control, and strict real-time performance, reliability and safety are required; users are scattered and large in quantity, the traditional wired communication construction difficulty is high, and 2G, 3G and 4G wireless communication cannot meet the requirement of low time delay; the accurate load regulation requires millisecond time delay, and 5G can well meet the requirements.
The 5G has the characteristics of large connection, high speed, Low time delay and the like, and millisecond-level time delay is realized through the technologies of new air interface waveform design, sinking deployment, Ultra-high reliability and Low Latency Communications (uRLLC) network slicing and the like. Based on the outstanding advantages of 5G wireless communication, the virtual special network with guaranteed quality such as high bandwidth, high reliability, low time delay and safety can be provided for different service scenes of the virtual power plant, the regulation and control requirements of the application scenes of the virtual power plant can be well met, and personalized service can be provided according to the requirements of users.
The 5G core network employs a Service Based Architecture (SBA). The SBA architecture refers to the design concept of 'micro-service' in the IT field and defines network functions as a plurality of relatively independent service modules which can be flexibly called. Therefore, operators can flexibly customize networking according to business requirements, and can adapt to different scenes by customizing the 'slice'.
A Network Slicing (Network Slicing) is to divide a physical Network into a plurality of virtual networks, and each virtual Network is divided according to service requirements of different time delay, bandwidth, safety and reliability so as to adapt to different application scenarios. Network slicing is implemented by Network Function Virtualization (NFV) and Software Defined Networking (SDN), and various vertical applications require end-to-end Network slicing. The 5G application scenes are diversified, such as broadband, large-scale, safety, time delay, reliability and the like, various scenes are customized and adapted through different network slices, and the slice network division is used for replacing a special physical network deployment to save cost. However, how to design a network slicing method for a virtual power plant communication system is still a problem to be researched and solved.
Disclosure of Invention
The invention provides a digital twin oriented virtual power plant communication fault monitoring and control enhancement method, which can design a network slicing method aiming at a virtual power plant communication system.
The invention adopts the following technical scheme.
A digital twin-oriented virtual power plant communication fault monitoring and control enhancing method comprises the following steps:
s1, designing a virtual power plant communication network system architecture based on the digital twin;
according to the multi-level service requirements of the virtual power plant, a digital twin virtual power plant communication system architecture is divided into a sensing layer, an access layer, a backbone layer, a control center and a scheduling center, a 5G-based virtual power plant communication network is constructed, 5G technical information safety, data acquisition and instruction issuing of a virtual power plant transaction operation system are realized, and two-level coordination control of virtual power plant transaction operation and the virtual power plant is realized;
step S2, identifying and positioning communication faults based on communication protocol behavior monitoring;
step S3, adopting a communication control enhancement method for the 5G time delay perception problem of the virtual power plant, wherein the method comprises the following steps: the method has the advantages that the transmission time interval TTI is shortened, the scheduling algorithm is enhanced to reduce the air interface access delay, the full optical network is adopted to reduce the delay forward of the bearer network, the means of optimizing forwarding routing, reducing mapping multiplexing layers and network sinking to enable a user to access nearby is adopted to reduce the core network delay, network slicing is realized based on NFV and SDN, and the end-to-end 5G network slicing technology is utilized to provide communication quality guarantee.
In step S2, through analysis of communication protocols, extraction of application data, identification of communication abnormal phenomena, judgment of remote sensing change, remote signaling change statistics and remote control operation statistics, whether communication faults exist in communication or not is found, the reasons of error and missing report are determined, problems or defects existing in a system are timely found, remote sensing change and non-refreshing phenomena occurring in communication are found, and remote sensing point numbers where the abnormal phenomena exist are located are positioned; therefore, potential safety hazards existing in the communication system are eliminated, and the safe and stable operation level of the system is improved.
The analysis of the communication protocol and the extraction of the application data refer to the identification of telemetering data, telesignaling deflection data and teleoperation data and information point numbers of the data through analyzing the communication process and the message structure of the communication protocol.
The identification of the communication abnormal phenomenon refers to that according to the requirement of a communication protocol, communication behaviors which do not meet the requirement of the protocol and all communication error phenomena including message missending, communication abnormity and information loss can be found.
The telemetering and changing judgment adopts an algorithm of a three-point slope comparison method, the telemetering data of the same point number is continuously monitored according to the information point number, the slopes of the current point and the previous point are calculated in real time, when the difference value of two adjacent slopes exceeds a set threshold value, the telemetering and changing is considered to occur, wherein when the telemetering and changing of different point numbers possibly have different changing threshold values, different point numbers need to be set independently.
The remote control operation statistics refers to monitoring the process of remote control operation, recording the starting time, the operation object, the operation conclusion and the ending time of the remote control operation, and performing classification statistics or complete statistics according to the operation object and the operation conclusion.
The communication protocols comprise IEC61850, IEC60870-5-104 and compatible versions of various provinces, IEC60870-5-101 and compatible versions of various provinces, IEC60870-5-103 and compatible versions of various manufacturers, CDT, Nanrui technology network 103 protocol, Nanrui relay network 103 protocol, national electric south China network 103 protocol and Beijing tetragonal network 103 protocol.
In step S1, a novel virtual power plant transaction operation form based on 5G meeting the requirements of the energy internet and the power internet of things is constructed.
In the virtual power plant communication network of step S1, terminals (distributed energy sources such as wind energy and photovoltaic, energy storage devices, and controllable loads) of the virtual power plant are connected to the 5G base station through the CPE or the embedded 5G communication module of the 5G customer premise equipment, the 5G base station is connected to the 5G core network through optical fiber transmission, and finally data collected by the terminals are transmitted to the control center of the virtual power plant through the 5G or dedicated lines;
the 5G core network adopts service-based architectures SBA and SA; the virtual power plant provides a data transmission channel for the regulation and control of distributed energy, energy storage and controllable load terminals by using a 5G communication network;
the terminal of the virtual power plant comprises distributed energy sources, energy storage equipment and controllable loads; the distributed energy sources comprise wind energy and photovoltaic.
In the step S3, the end-to-end 5G network slicing technology is used to provide communication quality assurance, and the implementation method includes two specific schemes,
the scheme is that the control center regulates and controls distributed energy, stored energy and controllable load by means of end-to-end 5G network slices; the method comprises the steps that different slices are deployed according to quality requirements of different users in distributed energy, energy storage and controllable load business regulation and control facing to regulation and control requirements of a virtual power plant, and resources are distributed according to user requirements on one hand through deployment and customization of the slices, so that personalized network slice service is provided; on the other hand, the security isolation is provided for the operation of the network slice;
in order to realize rapid scheduling, 5G uRLLC and eMBB scene slices are preferred, different priorities are allocated according to different user requirements, and resources obtained by different slice users can meet the requirements of the users under the condition of sufficient resources. When the resource is limited, the requirement of the high-priority user can be met preferentially through differentiated network slice resource allocation.
The second scheme is to assist the realization of network slicing of peak and frequency modulation services, namely, link mapping between different VNFs is completed based on the idea of shortest path on the basis of establishing a virtual node mapping relationship, and the method comprises the following steps:
firstly, establishing a mapping relation of virtual nodes, defining time delay performance influence factors of a network function VNF from the perspective of the ratio of resources required by the VNF to resources provided by a server when the virtual nodes are mapped, establishing a mapping model of the virtual nodes by combining the definition of the VNF performance influence factors, and then solving a node mapping result by using an intelligent search algorithm;
the network management and orchestrator receives data sent by a network slice example and an infrastructure layer, loads information such as service description and network topology of the network slice example into a network service directory, loads information of description classes such as virtual resources required by a VNF (virtual network function) into the VNF directory, updates information of an NFV (network function virtualization) example library, loads information such as physical network topology and residual resources into an infrastructure resource library, starts an intelligent algorithm after all information is complete, and starts to solve a mapping result;
secondly, after mapping of all VNFs of the network slice example is completed, link mapping between different VNFs is completed based on the idea of the shortest path; obtaining a deployment sequence of VNFs according to sequence constraints among the VNFs of the service chain SFC, deploying the VNFs to a server, solving paths among the servers by adopting a shortest path algorithm, and mapping a virtual shortest path of the VNFs to a physical link with a minimum hop;
whether the link resource constraint is met is checked, the residual bandwidth resource of each physical link is ensured to be not less than the bandwidth resource required by the virtual link, and if the residual bandwidth resource is not met, the shortest path is adopted.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the virtual power plant communication fault monitoring technology is provided, and various types of faults existing in a communication system can be identified and positioned, so that potential safety hazards existing in the system are eliminated, and the safe and stable operation level of the system is improved.
The virtual power plant communication enhancement control technology based on the 5G network slicing technology is provided, and a bidirectional channel is provided for the virtual power plant to realize real-time, reliable and safe transmission of various acquisition, monitoring and control data.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of a 5G-based virtual power plant communication network architecture;
FIG. 2 is a schematic diagram of a 5G network slice oriented to the regulation and control requirements of a virtual power plant;
fig. 3 is a schematic diagram of an example deployment of an auxiliary peak and frequency modulation service network slice.
Detailed Description
As shown in the figure, the digital twin-oriented virtual power plant communication fault monitoring and control enhancement method comprises the following steps:
s1, designing a virtual power plant communication network system architecture based on the digital twin;
according to the multi-level service requirements of the virtual power plant, a digital twin virtual power plant communication system architecture is divided into a sensing layer, an access layer, a backbone layer, a control center and a scheduling center, a 5G-based virtual power plant communication network is constructed, 5G technical information safety, data acquisition and instruction issuing of a virtual power plant transaction operation system are realized, and two-level coordination control of virtual power plant transaction operation and the virtual power plant is realized;
step S2, identifying and positioning communication faults based on communication protocol behavior monitoring;
step S3, adopting a communication control enhancement method for the 5G time delay perception problem of the virtual power plant, wherein the method comprises the following steps: the method has the advantages that the transmission time interval TTI is shortened, the scheduling algorithm is enhanced to reduce the air interface access delay, the full optical network is adopted to reduce the delay forward of the bearer network, the means of optimizing forwarding routing, reducing mapping multiplexing layers and network sinking to enable a user to access nearby is adopted to reduce the core network delay, network slicing is realized based on NFV and SDN, and the end-to-end 5G network slicing technology is utilized to provide communication quality guarantee.
In step S2, through analysis of communication protocols, extraction of application data, identification of communication abnormal phenomena, judgment of remote sensing change, remote signaling change statistics and remote control operation statistics, whether communication faults exist in communication or not is found, the reasons of error and missing report are determined, problems or defects existing in a system are timely found, remote sensing change and non-refreshing phenomena occurring in communication are found, and remote sensing point numbers where the abnormal phenomena exist are located are positioned; therefore, potential safety hazards existing in the communication system are eliminated, and the safe and stable operation level of the system is improved.
The analysis of the communication protocol and the extraction of the application data refer to the identification of telemetering data, telesignaling deflection data and teleoperation data and information point numbers of the data through analyzing the communication process and the message structure of the communication protocol.
The identification of the communication abnormal phenomenon refers to that according to the requirement of a communication protocol, communication behaviors which do not meet the requirement of the protocol and all communication error phenomena including message missending, communication abnormity and information loss can be found.
The telemetering and changing judgment adopts an algorithm of a three-point slope comparison method, the telemetering data of the same point number is continuously monitored according to the information point number, the slopes of the current point and the previous point are calculated in real time, when the difference value of two adjacent slopes exceeds a set threshold value, the telemetering and changing is considered to occur, wherein when the telemetering and changing of different point numbers possibly have different changing threshold values, different point numbers need to be set independently.
The remote control operation statistics refers to monitoring the process of remote control operation, recording the starting time, the operation object, the operation conclusion and the ending time of the remote control operation, and performing classification statistics or complete statistics according to the operation object and the operation conclusion.
The communication protocols comprise IEC61850, IEC60870-5-104 and compatible versions of various provinces, IEC60870-5-101 and compatible versions of various provinces, IEC60870-5-103 and compatible versions of various manufacturers, CDT, Nanrui technology network 103 protocol, Nanrui relay network 103 protocol, national electric south China network 103 protocol and Beijing tetragonal network 103 protocol.
In step S1, a novel virtual power plant transaction operation form based on 5G meeting the requirements of the energy internet and the power internet of things is constructed.
In the virtual power plant communication network of step S1, terminals (distributed energy sources such as wind energy and photovoltaic, energy storage devices, and controllable loads) of the virtual power plant are connected to the 5G base station through the CPE or the embedded 5G communication module of the 5G customer premise equipment, the 5G base station is connected to the 5G core network through optical fiber transmission, and finally data collected by the terminals are transmitted to the control center of the virtual power plant through the 5G or dedicated lines;
the 5G core network adopts service-based architectures SBA and SA; the virtual power plant provides a data transmission channel for the regulation and control of distributed energy, energy storage and controllable load terminals by using a 5G communication network;
the terminal of the virtual power plant comprises distributed energy sources, energy storage equipment and controllable loads; the distributed energy sources comprise wind energy and photovoltaic.
In the step S3, the end-to-end 5G network slicing technology is used to provide communication quality assurance, and the implementation method includes two specific schemes,
the scheme is that the control center regulates and controls distributed energy, stored energy and controllable load by means of end-to-end 5G network slices; the method comprises the steps that different slices are deployed according to quality requirements of different users in distributed energy, energy storage and controllable load business regulation and control facing to regulation and control requirements of a virtual power plant, and resources are distributed according to user requirements on one hand through deployment and customization of the slices, so that personalized network slice service is provided; on the other hand, the security isolation is provided for the operation of the network slice;
in order to realize rapid scheduling, 5G uRLLC and eMBB scene slices are preferred, different priorities are allocated according to different user requirements, and resources obtained by different slice users can meet the requirements of the users under the condition of sufficient resources. When the resource is limited, the requirement of the high-priority user can be met preferentially through differentiated network slice resource allocation.
The second scheme is to assist the realization of network slicing of peak and frequency modulation services, namely, link mapping between different VNFs is completed based on the idea of shortest path on the basis of establishing a virtual node mapping relationship, and the method comprises the following steps:
firstly, establishing a mapping relation of virtual nodes, defining time delay performance influence factors of a network function VNF from the perspective of the ratio of resources required by the VNF to resources provided by a server when the virtual nodes are mapped, establishing a mapping model of the virtual nodes by combining the definition of the VNF performance influence factors, and then solving a node mapping result by using an intelligent search algorithm;
the network management and orchestrator receives data sent by a network slice example and an infrastructure layer, loads information such as service description and network topology of the network slice example into a network service directory, loads information of description classes such as virtual resources required by a VNF (virtual network function) into the VNF directory, updates information of an NFV (network function virtualization) example library, loads information such as physical network topology and residual resources into an infrastructure resource library, starts an intelligent algorithm after all information is complete, and starts to solve a mapping result;
secondly, after mapping of all VNFs of the network slice example is completed, link mapping between different VNFs is completed based on the idea of the shortest path; obtaining a deployment sequence of VNFs according to sequence constraints among the VNFs of the service chain SFC, deploying the VNFs to a server, solving paths among the servers by adopting a shortest path algorithm, and mapping a virtual shortest path of the VNFs to a physical link with a minimum hop;
whether the link resource constraint is met is checked, the residual bandwidth resource of each physical link is ensured to be not less than the bandwidth resource required by the virtual link, and if the residual bandwidth resource is not met, the shortest path is adopted.
Example (b):
the method in the embodiment comprises the following specific implementation steps:
In order to realize the novel virtual power plant transaction operation form required by the energy Internet and the power Internet of things, a digital twin virtual power plant communication system architecture is divided into a sensing layer, an access layer, a backbone layer, a control center and a scheduling center according to the multi-level service requirements of the virtual power plant. The virtual power plant communication network based on 5G is constructed aiming at the problems that the data acquisition period of the current virtual power plant and subordinate equipment is long, the data volume is huge, the data acquisition dimensionality is small and the like. The method has the advantages that 5G technical information safety, data acquisition and instruction issuing of a virtual power plant transaction operation system are achieved, two-stage coordination control of virtual power plant transaction operation and a virtual power plant is achieved, and therefore a novel virtual power plant transaction operation form which meets the requirements of an energy internet and an electric power internet of things based on 5G is established.
A5G-based virtual power plant communication network is shown in FIG. 1. Terminals (distributed energy sources, energy storage Equipment and controllable loads such as wind energy and photovoltaic energy) of the virtual power plant are connected into a 5G base station through 5G Customer Premise Equipment (CPE) or an embedded 5G communication module, the 5G base station is connected into a 5G core network through optical fiber transmission, and finally data collected by the terminals are transmitted to a virtual power plant regulation and control center through 5G or a special line. The 5G core network employs service-based architectures SBA and SA. The virtual power plant utilizes the 5G communication network to provide a real-time, reliable and safe data transmission channel for the regulation and control of the distributed energy, energy storage and controllable load terminal, and can avoid the defects of long construction period, high cost and poor transmission quality of other communication networks.
And 2, identifying and positioning the communication fault based on the communication protocol behavior monitoring.
Whether communication faults exist in communication or not is found through steps of analysis of communication protocols, extraction of application data, identification of communication abnormal phenomena, judgment of remote measurement changing, remote communication displacement statistics, remote control operation statistics and the like, the reasons of errors and missing reports are determined, problems or defects existing in the system can be found in time, the phenomena of remote measurement changing and non-refreshing occurring in communication are found, and remote measurement point numbers where the abnormal phenomena exist are located. Therefore, potential safety hazards existing in the communication system are eliminated, and the safe and stable operation level of the system is improved.
Based on communication protocol behavior monitoring discerns and fixes a position communication fault, the prerequisite is that gather all communication processes of virtual power plant transformer substation or dispatch end, include: and dispatching communication processes between the master station and the telecontrol host, between the telecontrol host and each automatic device (protection, measurement and control and the like), between a monitoring system and each automatic device, between a protection information substation and each protection device and recording waves, and extracting relevant information after carrying out online analysis on the communication processes.
The specific communication fault identification and positioning method comprises five steps:
(1) analyzing communication protocols and extracting application data: the communication process and the message structure of the communication protocol are analyzed, and the telemetering data, the remote signaling displacement data and the remote control operation data as well as the information point numbers of the data can be identified.
(2) Identification of communication abnormality: according to the requirements of the communication protocol, the communication behaviors which do not meet the protocol requirements and all communication errors including message missending, communication abnormity, information loss and the like can be found.
(3) Discrimination of telemetry change: the telemetering data of the same point number is continuously monitored according to the information point number, the slope of the current point and the slope of the previous point are calculated in real time, when the difference value of two adjacent slopes exceeds a set threshold value, telemetering is considered to be changed more and more, and the algorithm is called as a three-point slope comparison method. Different threshold values may exist for telemetry of different point numbers, and need to be set separately.
(4) And (3) telesignalling deflection statistics: and continuously monitoring the telecommand deflection data of the same point number according to the information point number, counting the times and deflection time of telecommand deflection and the time interval between two deflection, wherein the time interval between two deflection can be set with a threshold value so as to judge whether the telecommand deflection has a virtual deflection phenomenon.
(5) Remote control operation statistics: and monitoring the process of remote control operation, recording the starting time, the operation object, the operation conclusion and the ending time of the remote control operation, and performing classified statistics or complete statistics according to the operation object and the operation conclusion.
Typical communication protocols in the power system include: IEC61850, IEC60870-5-104 (and compatible versions of various provinces), IEC60870-5-101 (and compatible versions of various provinces), IEC60870-5-103 (and compatible versions of various manufacturers), CDT, Nanrui technology network 103 protocol, Nanrui relay protection network 103 protocol, national electric south China self network 103 protocol, Beijing tetragonal network 103 protocol, and the like.
And step 3, enhancing communication control facing to virtual power plant time delay perception.
Aiming at a virtual power plant communication system scheme based on 5G, 5G network delay is related to wireless air interface delay, bearer network delay and core network delay, and measures need to be taken for integrally reducing the delay. The main technical means adopted for reducing the air interface access delay is to shorten the Transmission Time Interval (TTI) and enhance the scheduling algorithm; the time delay forward transmission of the bearer network is reduced by adopting a full optical network; the reduction of the core network time delay realizes the approach access means of a user through the technologies of optimizing forwarding routes, reducing mapping multiplexing layers, network sinking and the like; meanwhile, network slicing is realized based on NFV and SDN, and quality guarantee is provided by using an end-to-end 5G network slicing technology.
Specifically, the end-to-end 5G network slice includes two situations, one is that the regulation and control center regulates and controls distributed energy, energy storage and controllable load by means of the end-to-end 5G network slice; and secondly, the network slicing implementation of the auxiliary peak-shaving and frequency-modulation services is realized.
(1) The control center realizes the control of distributed energy, energy storage and controllable load by means of end-to-end 5G network slices
The 5G network slice facing the regulation and control requirement of the virtual power plant is shown in FIG. 2. Different slices are deployed according to the quality requirements of different users in the regulation and control of distributed energy resources such as wind energy, photovoltaic and the like, energy storage and controllable load services. On one hand, the deployment and customization of the slices allocate resources according to the requirements of users and provide personalized network slice service; and on the other hand, the method provides security isolation for network slice operation.
In order to realize rapid scheduling, uRLLC and eMB scene slices are preferred, and the uRLLC is suitable for rapid and highly reliable regulation and control task application scenes. Different priorities are distributed according to different user requirements, and resources obtained by different slice users can meet the requirements of the users under the condition of sufficient resources. When the resource is limited, the requirement of the high-priority user can be met preferentially through differentiated network slice resource allocation.
(2) Network slicing implementation of auxiliary peak and frequency modulation service
The network slice implementation deployment of the auxiliary peak and frequency modulation service is shown in fig. 3. Firstly, establishing a mapping relation of virtual nodes, defining time delay performance influence factors of VNFs from the aspect of the ratio of resources required by the VNFs to resources provided by a server when the virtual nodes are mapped, establishing a mapping model of the virtual nodes by combining the definitions of the VNF performance influence factors, and then calculating a node mapping result by using an intelligent search algorithm. The network management and orchestrator receives data sent by a network slice example and an infrastructure layer, loads information of service description, network topology and the like of the network slice example into a network service directory, loads information of description classes such as virtual resources and the like required by a VNF into the VNF directory, updates information of an NFV example library, loads information of physical network topology, residual resources and the like into an infrastructure resource library, starts an intelligent algorithm after all information is complete, and starts to solve a mapping result.
And secondly, after the mapping of all VNFs of the network slice example is completed, link mapping between different VNFs is completed based on the idea of the shortest path. Obtaining a deployment sequence of VNFs according to sequence constraints among the VNFs of the SFC, deploying the VNFs to a server, solving paths among the servers by adopting a shortest path algorithm, and mapping a virtual shortest path of the VNFs to a physical link of a minimum hop. Checking whether the link resource constraint is met, ensuring that the residual bandwidth resource of each physical link is not less than the bandwidth resource required by the virtual link, and if not, adopting the shortest path.
Claims (10)
1. A digital twin-oriented virtual power plant communication fault monitoring and control enhancing method is characterized by comprising the following steps: the method comprises the following steps:
s1, designing a virtual power plant communication network system architecture based on the digital twin;
according to the multi-level service requirements of the virtual power plant, a digital twin virtual power plant communication system architecture is divided into a sensing layer, an access layer, a backbone layer, a control center and a scheduling center, a 5G-based virtual power plant communication network is constructed, 5G technical information safety, data acquisition and instruction issuing of a virtual power plant transaction operation system are realized, and two-level coordination control of virtual power plant transaction operation and the virtual power plant is realized;
step S2, identifying and positioning communication faults based on communication protocol behavior monitoring;
step S3, adopting a communication control enhancement method for the 5G time delay perception problem of the virtual power plant, wherein the method comprises the following steps: the method has the advantages that the transmission time interval TTI is shortened, the scheduling algorithm is enhanced to reduce the air interface access delay, the full optical network is adopted to reduce the delay forward of the bearer network, the means of optimizing forwarding routing, reducing mapping multiplexing layers and network sinking to enable a user to access nearby is adopted to reduce the core network delay, network slicing is realized based on NFV and SDN, and the end-to-end 5G network slicing technology is utilized to provide communication quality guarantee.
2. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 1, characterized by comprising the following steps: in step S2, through analysis of communication protocols, extraction of application data, identification of communication abnormal phenomena, judgment of remote sensing change, remote signaling change statistics and remote control operation statistics, whether communication faults exist in communication or not is found, the reasons of error and missing report are determined, problems or defects existing in a system are timely found, remote sensing change and non-refreshing phenomena occurring in communication are found, and remote sensing point numbers where the abnormal phenomena exist are located are positioned; therefore, potential safety hazards existing in the communication system are eliminated, and the safe and stable operation level of the system is improved.
3. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 2, characterized by comprising the following steps: the analysis of the communication protocol and the extraction of the application data refer to the identification of telemetering data, telesignaling deflection data and teleoperation data and information point numbers of the data through analyzing the communication process and the message structure of the communication protocol.
4. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 2, characterized by comprising the following steps: the identification of the communication abnormal phenomenon refers to that according to the requirement of a communication protocol, communication behaviors which do not meet the requirement of the protocol and all communication error phenomena including message missending, communication abnormity and information loss can be found.
5. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 2, characterized by comprising the following steps: the telemetering and changing judgment adopts an algorithm of a three-point slope comparison method, the telemetering data of the same point number is continuously monitored according to the information point number, the slopes of the current point and the previous point are calculated in real time, when the difference value of two adjacent slopes exceeds a set threshold value, the telemetering and changing is considered to occur, wherein when the telemetering and changing of different point numbers possibly have different changing threshold values, different point numbers need to be set independently.
6. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 2, characterized by comprising the following steps: the remote control operation statistics refers to monitoring the process of remote control operation, recording the starting time, the operation object, the operation conclusion and the ending time of the remote control operation, and performing classification statistics or complete statistics according to the operation object and the operation conclusion.
7. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 2, characterized by comprising the following steps: the communication protocols comprise IEC61850, IEC60870-5-104 and compatible versions of various provinces, IEC60870-5-101 and compatible versions of various provinces, IEC60870-5-103 and compatible versions of various manufacturers, CDT, Nanrui technology network 103 protocol, Nanrui relay network 103 protocol, national electric south China network 103 protocol and Beijing tetragonal network 103 protocol.
8. The digital twin-oriented virtual power plant communication fault monitoring and control enhancement method of claim 1, characterized by comprising the following steps: in step S1, constructing a novel virtual power plant transaction operation form which meets the requirements of an energy internet and an electric power internet of things based on 5G;
in the virtual power plant communication network of step S1, the terminal of the virtual power plant is connected to the 5G base station through the 5G customer premise equipment CPE or the embedded 5G communication module, the 5G base station is connected to the 5G core network through optical fiber transmission, and finally the data collected by the terminal is transmitted to the virtual power plant regulation and control center through the 5G or dedicated line;
the 5G core network adopts service-based architectures SBA and SA; the virtual power plant provides a data transmission channel for the regulation and control of distributed energy, energy storage and controllable load terminals by using a 5G communication network;
the terminal of the virtual power plant comprises distributed energy sources, energy storage equipment and controllable loads; the distributed energy sources comprise wind energy and photovoltaic.
9. The digital twin oriented virtual power plant communication fault monitoring and control enhancement method of claim 8, wherein: in the step S3, the end-to-end 5G network slicing technology is used to provide communication quality assurance, and the implementation method includes two specific schemes,
the scheme is that the control center regulates and controls distributed energy, stored energy and controllable load by means of end-to-end 5G network slices; the method comprises the steps that different slices are deployed according to quality requirements of different users in distributed energy, energy storage and controllable load business regulation and control facing to regulation and control requirements of a virtual power plant, and resources are distributed according to user requirements on one hand through deployment and customization of the slices, so that personalized network slice service is provided; on the other hand, the security isolation is provided for the operation of the network slice;
in order to realize rapid scheduling, 5G uRLLC and eMBB scene slices are preferred, different priorities are distributed according to different user requirements, and resources obtained by different slice users can meet the requirements of the users under the condition of sufficient resources;
when the resource is limited, the requirement of the high-priority user can be met preferentially through differentiated network slice resource allocation.
10. The digital twin oriented virtual power plant communication fault monitoring and control enhancement method of claim 9, wherein: the second scheme is to assist the realization of network slicing of peak and frequency modulation services, namely, link mapping between different VNFs is completed based on the idea of shortest path on the basis of establishing a virtual node mapping relationship, and the method comprises the following steps:
firstly, establishing a mapping relation of virtual nodes, defining time delay performance influence factors of a network function VNF from the perspective of the ratio of resources required by the VNF to resources provided by a server when the virtual nodes are mapped, establishing a mapping model of the virtual nodes by combining the definition of the VNF performance influence factors, and then solving a node mapping result by using an intelligent search algorithm;
the network management and orchestrator receives data sent by a network slice example and an infrastructure layer, loads information such as service description and network topology of the network slice example into a network service directory, loads information of description classes such as virtual resources required by a VNF (virtual network function) into the VNF directory, updates information of an NFV (network function virtualization) example library, loads information such as physical network topology and residual resources into an infrastructure resource library, starts an intelligent algorithm after all information is complete, and starts to solve a mapping result;
secondly, after mapping of all VNFs of the network slice example is completed, link mapping between different VNFs is completed based on the idea of the shortest path; obtaining a deployment sequence of VNFs according to sequence constraints among the VNFs of the service chain SFC, deploying the VNFs to a server, solving paths among the servers by adopting a shortest path algorithm, and mapping a virtual shortest path of the VNFs to a physical link with a minimum hop;
whether the link resource constraint is met is checked, the residual bandwidth resource of each physical link is ensured to be not less than the bandwidth resource required by the virtual link, and if the residual bandwidth resource is not met, the shortest path is adopted.
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