CN106789172B - A distribution network communication system - Google Patents

Abstract

The invention discloses a distribution network network communication system, comprising: a neighborhood network unit, the neighborhood network unit includes a field router, a distribution network automation system and a plurality of workflow management terminals; a NOC network operation center, the NOC network The operation center includes the CG-NMS platform, the NOC application server and the NOC network server, which calls or stores data, and the NOC application server is connected to the NOC network server; the wide area network unit includes a security access module and a communication line. The distribution network network communication system of the present invention can realize the effect of mutual communication between the terminals by setting the field network unit as the field router, the distribution network automation system and the workflow management terminal, and through the NOC network operation center and the wide area network unit The setting of the terminal can realize the effect of transmitting the communication traffic of the terminal, reduce the resources such as the memory occupied by the communication, and meet the requirements of power grid transportation.

Description

A distribution network communication system

Technology neighborhood

The invention relates to a communication method, and more particularly to a distribution network network communication system.

Background technique

Because there are a large number of nodes in the power distribution system, and with the increase of equipment and the diversification of equipment, it is extremely difficult to realize the collection, monitoring, management and troubleshooting of the information of each node. It is a difficult problem faced by all power grid companies to collect timely and effective information of equipment information of each node and improve the utilization efficiency and security level of power energy.

In different environments, different communication methods such as wired, wireless, 3G or 4G may be deployed. Different communication methods increase the difficulty of system compatibility and conversion of background data collection.

When transferring data over a low-power and lossy network (LLN), the transfer rate can burst to 60%-90% of the total link bandwidth, resulting in unpredictable errors or connection loss.

Due to the lack of features such as NSF and ISSU in the power grid configuration network, the node failure rate is significantly higher than that of nodes in the traditional IP (Internet Protocol) network. Traditional protocols cannot meet the interconnection of such a large number of devices, and cannot meet the networking requirements of highly constrained and unstable environments.

The above problems can be solved by way of IoT, but with the IP intelligence of IoT objects, various types of nodes can be mixed into the communication infrastructure. Routing protocols must manage traffic paths based on the capabilities of nodes, and power distribution automation smart terminals must be able to transmit communication traffic. Devices installed in the last mile at the end of the network do not have as powerful computing and storage capabilities as PCs and servers. They have very limited resources in terms of power, CPU, memory and storage. Therefore, the embedded network protocol stack must strive to be limited to several K bits of flash memory and tens of K bits, and at the same time, the routing protocol must manage the traffic path based on the capabilities of the nodes, and the power distribution automation intelligent terminal must be able to transmit communication traffic. However, the existing The terminal communication structure cannot meet the above requirements.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a distribution network network communication system that can reduce the occupation of resources such as terminal CPU and memory.

In order to achieve the above purpose, the present invention provides the following technical solutions: a distribution network communication system, comprising:

A neighborhood network unit, the neighborhood network unit includes a field router, a distribution network automation system and a plurality of workflow management terminals, the distribution network automation system and the plurality of workflow management terminals are all connected to the field router, and the work flow management The connection between the flow management terminal and the field router is Ethernet or serial port or WiFi or RF Mesh or PLC Mesh. The communication protocol between the field router, the distribution automation system and the workflow management terminal is low power lossy Network protocol RPL;

NOC network operation center, the NOC network operation center includes CG-NMS platform, NOC application server and NOC network server, the CG-NMS platform includes front-end user interface and back-end database, both front-end user interface and back-end database are carried on NOC In the application server, the front-end user interface runs in the Red Hat Linux system, the back-end database is an Oracle database, and the front-end user interface is used for human-computer interaction, communicates with the back-end database through the Red Hat Linux system, calls or is to store data, and the NOC application server is connected to the NOC network server;

A wide area network unit, the wide area network unit includes a security access module and a communication line, the communication line is an optical fiber or an Ethernet private network or a global microwave interconnection access WiMAX or 3G/4G, and the communication line connects the field router and the NOC network server, so The security access module is arranged on one end of the communication line connected with the field router.

As a further improvement of the present invention, the traffic model of the communication line is as follows:

Point-to-multipoint: traffic from NOC network server to distribution network automation system, supports IPv4/IPv6 unicast and multicast, and supports SCADA protocol through protocol conversion.

Multipoint to Multipoint: Traffic from the workflow management terminal to the NOC network server.

Point-to-point: traffic between external substations, supports Layer 2 IEC 61580 GOOSE/SV in addition to IPv4/IPv6, and communication between auto-closing switch controllers, using WiMAX CPE to WiMAX base stations in substations.

As a further improvement of the present invention, the security access module includes a certificate identification layer, a network admission control layer, a user management layer, a data security layer, a key management layer, a routing and traffic filtering layer, a security isolation layer and a physical security layer , the certificate identification layer, the network access control layer, the user management layer, the data security layer, the key management layer, the routing and traffic filtering layer, the security isolation layer and the physical security layer are connected to each other in turn, wherein the data from the certificate The identification layer enters, and goes through the network access control layer, user management layer, data security layer, key management layer, routing and traffic filtering layer, and security isolation layer, and then outputs from the physical security layer.

As a further improvement of the present invention, the workflow management terminal uses the CoAP-based Push mode, the SNMP of the field router uses the Pull mode, and the Netflow/IPfix in the communication line uses the Push mode;

Among them, CoAP is an application layer protocol, Push mode is a real-time playback mode, SNMP is a network management protocol, Pull mode is a playback mode, and Netflow/IPfix is IP data flow information output.

As a further improvement of the present invention, the RPL protocol flow of the low-power lossy network protocol is as follows:

Using the 902 to 928MHz frequency band, every 400kHz is the interval, a total of 64 non-overlapping frequency bands;

Running the Ethernet protocol of Ipv4/IPv6, and running IEC60870-5-104 at three layers to provide communication between the distribution network automation system and the workflow management terminal;

The serial port supports RS-232/RS-485 to provide communication between the workflow management terminal and the field router, and the device conforms to IEC60870-5-101;

Remote workflow management through the wired or WiFI wireless built-in CGR1000;

Use CG-Mesh technology to form NAN neighborhood network to support end-to-end IPv6 communication.

The beneficial effect of the present invention is that by setting the neighborhood network unit as the field router, the distribution network automation system and the workflow management terminal, the distribution network automation system and the workflow management terminal can be used to collect the work information of the power grid, and the The communication protocol running between the three is the low-power lossy network protocol RPL, which can effectively reduce the terminal CPU and memory resources occupied by the communication between the three, so that the communication will not take up too much terminal CPU and memory resources. Caused by the problem that the terminal cannot work well, and through the settings of the NOC network operation center and the WAN unit, the field router can communicate with the NOC network operation center through the WAN unit, transmit data to the NOC network operation center, and transfer the WAN unit to the NOC network operation center. It is set as a secure access module and communication line. The communication line can be used to effectively realize the communication function to realize the function of transmitting communication traffic, while the security access module can improve the security of transmitting communication traffic. The NOC network operation center is set to CG- The NMS platform, NOC application server and NOC network server can use the NOC network server to communicate with the communication line, and use the NOC application server and the CG-NMS platform to realize the interaction between data and people. The effect of NMS platform on data processing.

Description of drawings

Fig. 1 is the structural block diagram of the distribution network network communication system of the present invention;

FIG. 2 is a structural diagram of the security access module in FIG. 1 .

Detailed ways

The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

Referring to FIGS. 1 to 2 , a distribution network communication system of this embodiment is characterized in that it includes: a neighborhood network unit 1 , and the neighborhood network unit 1 includes a field router 11 and a distribution network automation system 12 and multiple workflow management terminals 13, the distribution automation system 12 and multiple workflow management terminals 13 are connected to the field router 11, and the connection between the workflow management terminal 13 and the field router 11 is Ethernet Or serial port or WiFi or RF Mesh or PLC Mesh, wherein, the communication protocol running between the field router 11, the distribution network automation system 12 and the workflow management terminal 13 is the low power lossy network protocol RPL;

NOC network operation center 2, the NOC network operation center 2 includes a CG-NMS platform 21, a NOC application server 22 and a NOC network server 23, the CG-NMS platform 21 includes a front-end user interface 211 and a back-end database 212, the front-end user interface 211 and the back-end database 212 are all mounted in the NOC application server 22, the front-end user interface 211 runs in the RedHat Linux system, the back-end database 212 is an Oracle database, and the front-end user interface 211 is used for human-computer interaction, Communicate with the back-end database 212 through the Red Hat Linux system, call or store data, and the NOC application server 22 is connected to the NOC network server 23;

Wide area network unit 3, the wide area network unit 3 includes a security access module 31 and a communication line 32, the communication line 32 is optical fiber or Ethernet or World Microwave Interconnection WiMAX or 3G/4G, the communication line 32 is connected to the field router 11 and NOC network server 23, the security access module 31 is arranged on the end of the communication line 32 connected to the field router 11, in the process of signal transmission of the distribution network, the distribution network automation system 12 collects power grid information, workflow The management terminal 13 collects the human operation information, and the above two kinds of information are transmitted to the field router 11 through the low power lossy network protocol RPL, and then the information data in the field router 11 is transmitted to the NOC network server 23 through the communication line 32, and then through the communication line 32. The NOC network server is transmitted to the NOC application server 22, and the user can process and store the data through the front-end user interface 211 and the back-end data 212, thus effectively completing the communication of information data. The communication between the network automation system 12 and the workflow management terminal 13 and the field router 11 uses the low power lossy network protocol RPL, which can effectively reduce the CPU and memory resources of the terminal occupied by the communication, and realize the communication structure. Lightweight, meet the demanding operating environment, and use Red Hat Linux for the communication between the front-end user interface 211 and the back-end database 212. Compared with the existing operating systems, Red Hat Linux occupies a small CPU running space and requires Therefore, it is possible to set the entire NOC application server 22 as a mobile terminal here, so that the entire communication structure becomes lightweight and meets the harsh operating environment. Effective protection makes the communication environment more secure and reliable.

As an improved specific implementation manner, the traffic model of the communication line 32 is as follows:

Point-to-multipoint: traffic from NOC network server 23 to distribution network automation system 12, supports IPv4/IPv6 unicast and multicast, and supports SCADA protocol through protocol conversion.

Multipoint to Multipoint: Traffic from the workflow management terminal 13 to the NOC network server 23 .

Point-to-point: traffic between external substations, supports Layer 2 IEC 61580GOOSE/SV in addition to IPv4/IPv6, and communication between automatic closing switch controllers, using WiMAX CPE to the WiMAX base station of the substation, when the communication line 23 meets the When the above traffic model is used, the effect that the communication line 23 can effectively transmit the communication traffic can be effectively achieved, so that the requirements required in the communication process of the terminal can be better met.

As an improved specific implementation manner, the security access module 31 includes a certificate identification layer, a network access control layer, a user management layer, a data security layer, a key management layer, a routing and traffic filtering layer, a security isolation layer, and a The physical security layer, the certificate identification layer, the network access control layer, the user management layer, the data security layer, the key management layer, the routing and traffic filtering layer, the security isolation layer and the physical security layer are connected to each other in turn, wherein, Data enters from the certificate identification layer, passes through the network access control layer, user management layer, data security layer, key management layer, routing and traffic filtering layer, and security isolation layer, and then outputs from the physical security layer. The settings of the access control layer, user management layer, data security layer, key management layer, routing and traffic filtering layer, security isolation layer and physical security layer can achieve the effect of multiple protection, and a piece of information data contains a variety of information Therefore, it is necessary to verify each piece of information contained in it to achieve the effect of security protection. Therefore, by using the above-mentioned multi-layer settings, the effect of using each layer to perform security verification on each piece of information in the data can be achieved. In this way, the security protection effect of information data can be better realized.

As an improved specific implementation manner, the workflow management terminal 31 uses the CoAP-based Push mode, the SNMP of the field router 11 uses the Pull mode, and the Netflow/IPfix in the communication line 32 uses the Push mode;

Among them, CoAP is an application layer protocol, the Push mode is a real-time playback mode, SNMP is a network management protocol, the Pull mode is a playback mode, and Netflow/IPfix is an IP data stream information output, and the workflow management terminal 31 is set to CoAP-based Push mode , the SNMP of the field router 11 uses the Pull mode and the Netflow/IPfix in the communication line 32 uses the Push mode, so that the field router 11 and the workflow management terminal 31 can realize the management of the flow path, which satisfies the communication between the power grid terminals. requirements.

As an improved specific implementation manner, the RPL protocol flow of the low power lossy network protocol is as follows:

Using the 902 to 928MHz frequency band, every 400kHz is the interval, a total of 64 non-overlapping frequency bands;

Running the Ethernet protocol of Ipv4/IPv6, and running IEC60870-5-104 at three layers to provide communication between the distribution network automation system 12 and the workflow management terminal 13;

The serial port supports RS-232/RS-485 to provide communication between the workflow management terminal 13 and the field router 11, and the device conforms to IEC 60870-5-101;

Remote workflow management through the wired or WiFI wireless built-in CGR1000;

Using CG-Mesh technology to form NAN neighborhood network to support end-to-end IPv6 communication, the use of end-to-end IP intelligent grid architecture can use 30 years of Internet protocol technology [RFC 6272] to ensure open standards and interoperability, in Largely proven by two billion end users, the adoption of an IP-based field area network has the following benefits:

·Open and standard-based network, the core component layer of transmission and application is standardized by the Internet Engineering Task Force IETF, while the key physical layer and data link are standardized by the usual industrial organizations and proposed application protocols.

Lightweight, meet the harsh operating environment

·Universal multi-service communication capability

The layered IP architecture is capable enough to handle any type of physical and data link layers, making it future-proof. Various media can be used in the deployment without changing the architecture and data flow of the overall solution.

·everywhere

All recent versions of operating systems, from PCs and servers to lightweight embedded systems, have an integrated dual-IP IPv4 and IPv6 stack, which makes the deployment of a new network function easier.

Scalable large-scale terminal access

With the widespread use of the Internet, IP has been deployed and tested on a large scale, with strong scalability to support millions of private or public IP infrastructure nodes, under a unified management similar to the expected field area network FAN deployments have been running for years.

· Manageability and security

Communication infrastructure requires proper management and security functions to operate properly, and IP networks have mature network management and security protocols, mechanisms and toolsets. Network management helps utilities operate business applications with the help of the interconnected grid network management system CG-NMS, utilizing network management tools to improve their services, for example, to identify when outages occur.

end to end

Provides end-to-end bidirectional communication between any device using an IP network. Implement data manipulation in a centralized or distributed architecture according to business requirements. Reducing the intermediate protocol and removing the translation gateway between the protocols is conducive to the introduction of new services in order to reduce the utilization of resources such as CPU and memory of the Wenzhou Electric Power Distribution Automation Terminal.

To sum up, in the distribution network communication system of the present invention, by setting the neighborhood network unit 1 as the field router 11, the distribution automation system 12 and the workflow management terminal 13, the distribution automation system can be realized and utilized. 12 collects power grid information, and the workflow management terminal 13 collects the operation information of the staff, and the three communicate with each other through the low-power lossy network protocol RPL, which can effectively reduce the CPU and memory resources occupied by the communication. The NOC network operation center 2 is set so that the CG-NMS platform 21, the NOC application server 22 and the NOC network server 23 can cooperate with the communication line 32 to achieve the effect of transmitting communication traffic, so that it can effectively meet the communication requirements of the power grid.

The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (7)

1. A power distribution network communication system is characterized in that: the method comprises the following steps:

the neighborhood network unit (1) comprises a field router (11), a distribution network automation system (12) and a plurality of workflow management terminals (13), wherein the distribution network automation system (12) and the workflow management terminals (13) are connected with the field router (11), the workflow management terminals (13) are connected with the field router (11) in an Ethernet or serial port or WiFi or RF Mesh or PLC Mesh mode, and a communication protocol running among the field router (11), the distribution network automation system (12) and the workflow management terminals (13) is a low-power lossy network protocol RPL;

the NOC network operation center (2), the NOC network operation center (2) comprises a CG-NMS platform (21), a NOC application server (22) and a NOC network server (23), the CG-NMS platform (21) comprises a front end user interface (211) and a back end database (212), the front end user interface (211) and the back end database (212) are loaded in the NOC application server (22), the front end user interface (211) runs in a Red Hat Linux system, the back end database (212) is an Oracle database, the front end user interface (211) is used for human-computer interaction, communicates with the back end database (212) through the Red Hat Linux system to call or store data, and the NOC application server (22) is connected with the NOC network server (23);

the wide area network unit (3), the wide area network unit (3) includes a secure access module (31) and a communication line (32), the communication line (32) is an optical fiber or an Ethernet or a worldwide interoperability for microwave Access WiMAX or 3G/4G, the communication line (32) connects the field router (11) and the NOC network server (23), the secure access module (31) is disposed on one end of the communication line (32) connected with the field router (11).

2. The power distribution network communication system according to claim 1, wherein: the flow model of the communication line (32) is as follows:

point-to-multipoint: the traffic from the NOC network server (23) to the distribution network automation system (12) supports unicast and multicast of IPv4/IPv6 and SCADA protocol through protocol conversion;

multipoint to multipoint: -traffic from the workflow management terminal (13) to the NOC network server (23);

point-to-point: traffic between external substations, besides IPv4/IPv6, supports two-layer IEC 61580GOOSE/SV, and communication between automatic closing switch controllers, uses WiMAX CPE to WiMAX base station of the substation.

3. The power distribution network communication system according to claim 1 or 2, wherein: the security access module (31) comprises a certificate identification layer, a network access control layer, a user management layer, a data security layer, a key management layer, a routing and flow filtering layer, a security isolation layer and a physical security layer, wherein the certificate identification layer, the network access control layer, the user management layer, the data security layer, the key management layer, the routing and flow filtering layer, the security isolation layer and the physical security layer are sequentially connected with one another, data enter from the certificate identification layer and are output from the physical security layer after passing through the network access control layer, the user management layer, the data security layer, the key management layer, the routing and flow filtering layer and the security isolation layer.

4. The power distribution network communication system according to claim 1 or 2, wherein: the workflow management terminal (31) uses a Push mode based on CoAP, the SNMP of the field router (11) uses a Push mode, and the Netflow/IPfix in the communication line (32) uses a Push mode;

the CoAP is an application layer protocol, the Push mode is a real-time playing mode, the SNMP is a network management protocol, the Pull mode is a playback mode, and the Netflow/IPfix is IP data flow information output.

5. The power distribution network communication system according to claim 3, wherein: the workflow management terminal (31) uses a Push mode based on CoAP, the SNMP of the field router (11) uses a Push mode, and the Netflow/IPfix in the communication line (32) uses a Push mode;

the CoAP is an application layer protocol, the Push mode is a real-time playing mode, the SNMP is a network management protocol, the Pull mode is a playback mode, and the Netflow/IPfix is IP data flow information output.

6. The power distribution network communication system according to claim 1 or 2, wherein: the low-power lossy network protocol RPL protocol flow is as follows:

using 902 to 928MHz frequency band, every 400kHz interval, and totally 64 non-overlapping frequency bands;

running the Ethernet protocol of Ipv4/IPv6, and three layers running IEC60870-5-104 provides communication between the distribution automation system (12) and the workflow management terminal (13);

the serial port supports RS-232/RS-485 to provide communication between a workflow management terminal (13) and a field router (11), and the equipment conforms to IEC 60870-5-101;

remote workflow management is carried out through a wire or a WiFI wireless network carried by the CGR 1000;

and (3) constructing a NAN neighborhood network by using a CG-Mesh technology to support end-to-end IPv6 communication.

7. The power distribution network communication system according to claim 3, wherein: the low-power lossy network protocol RPL protocol flow is as follows:

using 902 to 928MHz frequency band, every 400kHz interval, and totally 64 non-overlapping frequency bands;

running the Ethernet protocol of Ipv4/IPv6, and three layers running IEC60870-5-104 provides communication between the distribution automation system (12) and the workflow management terminal (13);

the serial port supports RS-232/RS-485 to provide communication between a workflow management terminal (13) and a field router (11), and the equipment conforms to IEC 60870-5-101;

remote workflow management is carried out through a wire or a WiFI wireless network carried by the CGR 1000;

and (3) constructing a NAN neighborhood network by using a CG-Mesh technology to support end-to-end IPv6 communication.

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