CN112565050A - Inter-station communication method and system for stable device - Google Patents

Abstract

The invention provides an inter-station communication method of a stability device, which comprises the following steps: the method comprises the steps that a first stabilization device and a second stabilization device are established based on a VPLS network in a tunnel communication connection mode, the first stabilization device broadcasts and sends GOOSE messages through a PE router group, the GOOSE messages contain VLAN where the first stabilization device is located and VLAN ID, after the GOOSE messages are received, the VLAN information is removed after the GOOSE messages are judged to be the first stabilization device according to the VLAN ID, and the GOOSE messages with the VLAN information removed are transmitted to the second stabilization device in the corresponding VLAN. According to the scheme, tunnel communication based on the IEC61850 safety device is realized by deploying the VPLS network, point-to-multipoint communication of the safety device is realized, information closed loop can be avoided, delay caused by message forwarding is reduced, and safety and reliability of data transmission can be guaranteed.

Description

Inter-station communication method and system for stable device

Technical Field

The invention relates to the technical field of transformer substation communication, in particular to a method and a system for communication between stable device stations.

Background

The safety and stability device which is used as the key component of the second defense line of the power grid reduces the accident influence range, avoids the development of cascading failures and ensures the stable operation of the system through measures such as cutting machine and cutting load. The second IEC61850 version extends the communication in the transformer substation to the transformer substation, and provides a new solution for realizing wide-area, rapid and orderly matching actions between the safety devices. With the continuous enlargement of the power grid scale, especially the interconnection of the power grids across large areas promotes the power grid connection and increases the risk of large-scale power failure events caused by cascading failures. By analyzing blackout accidents occurring at home and abroad in recent years, except for few blackout accidents caused by extreme weather, most of the blackout accidents are cascading failures caused by long-term overload of a line or misoperation and refusal of a relay protection device.

In order to ensure the safe and stable operation of an electric power system, communication coordination needs to be carried out among different safety devices, so that risks are reduced, most of inter-station communication of the existing safety devices adopts an SDH (synchronous digital hierarchy) looped network mode, the multicast of GOOSE (generic object oriented substation event) is different from that in a transformer substation, when the safety A sends multicast information, the safety devices which are not directly connected need to carry out message forwarding through the safety B or the safety E, the forwarded information easily forms a loop, and meanwhile, when the optical fiber of the loop is disconnected, the GOOSE message is forwarded from the first to the last, and the action condition that the safety is directly influenced by a large delay can be caused.

Disclosure of Invention

In view of this, the embodiment of the present invention provides an inter-station communication method for a stable device, so as to solve the problems that a loop is easily formed and forwarding is delayed in the existing SDH-based method.

In a first aspect of an embodiment of the present invention, a method for inter-station communication between stable devices is provided, including:

establishing a tunnel communication connection between a first security and stabilization device and a second security and stabilization device based on a VPLS network, wherein the number of the second security and stabilization devices can be one or more;

and after receiving the GOOSE message, judging the first stabilizing device according to the VLAN ID, removing VLAN information, and forwarding the GOOSE message without the VLAN information to a second stabilizing device corresponding to the VLAN.

In one embodiment, when a failure occurs, the communication tunnel is re-established based on the MPLS network architecture, and information loops are avoided by configuring MPLS.

In one embodiment, after the stability of the stability device is determined, the corresponding stability action measure is searched in the policy table according to the fault information and the operation mode to perform the stability operation.

In one embodiment, the first stabilizing device comprises a GOOSE communication module and an SV communication module, and correspondingly, the second stabilizing device comprises a GOOSE communication module and an SV communication module; the GOOSE communication module and the SV communication module realize message receiving and sending through socket sockets.

In an embodiment, in the GOOSE communication module, after receiving the message, the stabilizing device filters out the specified address message through a BPF filtering mechanism, determines whether the filtered message is a GOOSE message, analyzes the message if the message is a GOOSE message, determines whether the GOOSE message indicates an abnormality, sends the abnormal message to a corresponding stabilizing function to perform stabilizing operation if the GOOSE message is abnormal information, and sends the action information to the corresponding stabilizing function if the GOOSE message is normal information.

In one embodiment, in the GOOSE communication module, before sending a GOOSE message, a stabilizing device judges whether the device reaches a stable state according to a heartbeat message and an action signal, determines a next frame sending time interval according to the sending times of the action signal, determines whether the action signal is an intra-station action, and codes the intra-station action message, adds a multicast address and writes the action message into a network card buffer area for multicast sending if the action signal is the intra-station action; and if the substation action is the off-site action, encoding the off-site action message, adding a target address, writing the action message into a network card buffer area and sending the action message to a corresponding substation gateway.

In one embodiment, in the SV communication module, after receiving a message, a stabilizing device filters an address-specific message through a BPF filtering mechanism, determines whether the filtered message is an SV message, if so, determines whether the message is a test message, if so, compares the test message with a stabilizing platen to determine an abnormality, and if not, calculates a phase of a signal effective value through fast fourier transform after resampling and linear difference, and transmits the amplitude value and the phase value to a stabilizing corresponding function.

In one embodiment, in the SV communication module, before sending an SV message, the stabilizing device determines whether an SV message sending period is reached, and if the SV message sending period is reached, encodes an electrical quantity to be sent, adds an MAC address of a target substation, and writes the SV message to a network card buffer for sending.

In the embodiment of the invention, a tunnel communication mode based on the IEC61850 stabilizing device is realized by deploying the VPLS network, the transmission of two-layer data in a third-layer network can be realized, the point-to-multipoint communication is realized, the multicast of GOOSE messages can be carried out, the information closed loop can be avoided, the delay caused by message forwarding is reduced, and the safety and reliability of data transmission can be ensured. Meanwhile, VLAN is convenient to establish for flow control, and impact of flood range on the network is prevented.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating a working principle of a VPLS according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a method for inter-station communication between stable devices according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a stabilizing device receiving a GOOSE message according to an embodiment of the present invention;

fig. 4 is a schematic flow chart of sending a GOOSE message by a stabilizing device according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of a stabilizing device receiving an SV message according to an embodiment of the present invention;

fig. 6 is a schematic flow chart of sending SV messages by a stabilizing device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons skilled in the art without any inventive work shall fall within the protection scope of the present invention, and the principle and features of the present invention shall be described below with reference to the accompanying drawings.

The terms "comprises" and "comprising," when used in this specification and claims, and in the accompanying drawings and figures, are intended to cover non-exclusive inclusions, such that a process, method or system, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements.

The terms "comprises" and "comprising," when used in this specification and claims, and in the accompanying drawings and figures, are intended to cover non-exclusive inclusions, such that a process, method or system, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements. In addition, "first" and "second" are used to distinguish different objects, and are not used to describe a specific order.

Vpls (virtual Private LAN service) is a point-to-multipoint L2VPN (second layer virtual local area network) service provided in a public network, and an MPLS network frame is used to connect a plurality of access points, and simultaneously, an ethernet technology is used to form a new virtual Private network from a plurality of points, thereby realizing that LANs in different regions can be accessed as in one LAN, as shown in fig. 1. Because VPLS emulates an ethernet bridge for the customer over the MPLS backbone network, forwarding may be based on MAC addresses or MAC addresses plus VLAN identification without requiring IP addressing and routing. The VPLS also supports QinQ protocol (802.1Q in 802.1Q) to provide point-to-multipoint L2VPN service, a VLAN TAG of a user network can be packaged in a public network VLAN TAG, and finally a message carries two layers of TAGs to pass through a backbone network of a service provider, so that a two-layer VPN tunnel is realized. The VPLS also supports functions of MAC address management, flood coverage and forwarding, loop avoidance and the like, and is convenient for expanding GOOSE and SV in the transformer substation to the transformer substation.

Referring to fig. 2, fig. 2 is a schematic flow chart of a method for communication between stable devices according to an embodiment of the present invention, including:

s201, establishing a tunnel communication connection between a first stabilizing device and a second stabilizing device based on a VPLS network, wherein the number of the second stabilizing devices can be one or more;

it can be understood that, for the inter-substation communication network which already adopts the MPLS architecture or the regional power grid to be deployed, a tunnel communication mode based on the IEC61850 stabilizing device can be realized by deploying the VPLS network. The VPLS can directly realize the transmission of the two-layer data in the third-layer network, is convenient for realizing the multicast of the GOOSE message, is convenient for establishing the VLAN for flow control, prevents the impact of a flood range on the network and has higher network security level. If the security device A at the transformer substation A is communicated with the security device E at the transformer substation E, a tunnel is directly established without other devices for forwarding, and meanwhile, when the security device A performs multicast, B, C, D, E of the same VLAN can directly establish the tunnel with the security device A for communication.

S202, the first stabilizing device broadcasts and sends a GOOSE message through a PE router group, the GOOSE message at least comprises a VLAN where the first stabilizing device is located and a VLAN ID, after the GOOSE message is received, the VLAN information is removed after the first stabilizing device is judged according to the VLAN ID, and the GOOSE message after the VLAN information is removed is forwarded to a second stabilizing device corresponding to the VLAN.

The GOOSE message is a rapid message transmission mechanism in IEC61850, and GOOSE message information can be transmitted among different safety devices, so that the safe and stable operation of a power system of a transformer substation is guaranteed.

Illustratively, during communication, a message sent by the stabilizing device a includes a VLAN and a VLAN _ ID where the station is located, the VLAN _ ID of the substation VLAN where the station a is located is added to the message at a PE router that passes through an outlet of the substation a, and other station devices (such as PE routers) identify whether the information is sent for the station a in a stabilizing manner through the substation VLAN _ ID, and remove the substation VLAN information in a GOOSE packet for stabilizing the station a and send the substation VLAN information to the in-station VLAN where the corresponding stabilizing device is located.

When failure occurs, the network frame of MPLS will quickly rebuild tunnel, and information loop can be avoided by reasonably configuring MPLS.

The stability judgment and action of the stability device mainly search corresponding stability action measures in the strategy table according to the fault information and the operation mode. Therefore, the logic node for the stability judgment and the stability action function needs to define the content of the policy table and the flow of the stability decision. The stability device strategy table is a multi-dimensional data set, comprises fault elements, fault types, operation modes, detection sections, power and action quantities, and needs a plurality of tables to represent different operation modes, so that the stability device needs to select a proper strategy table according to the operation modes and passes through the fault elements when judging stability.

Specifically, the first stabilizing device comprises a GOOSE communication module and an SV communication module, and correspondingly, the second stabilizing device comprises a GOOSE communication module and an SV communication module; the GOOSE communication module and the SV communication module realize message receiving and sending through socket sockets.

In one embodiment, the process of receiving GOOSE messages by the security device is shown in fig. 3. In the GOOSE communication module, after receiving a message, a stabilizing device filters out an appointed address message through a BPF (Business process format) filtering mechanism, judges whether the filtered message is a GOOSE message, discards the GOOSE message if the GOOSE message is not the GOOSE message, analyzes the message if the GOOSE message is the GOOSE message, judges whether the GOOSE message represents abnormity, sends abnormal information to a corresponding stabilizing function to perform stabilizing operation if the GOOSE message is abnormal information, and sends action information to the corresponding stabilizing function if the GOOSE message is normal information.

In an embodiment, a GOOSE message sending process of a security device is as shown in fig. 4, in the GOOSE communication module, before sending a GOOSE message, the security device judges whether a steady state is reached, if the steady state is reached, encodes a heartbeat message, writes into a network card buffer for multicast sending, if the steady state is not reached, judges whether an action signal exists, if the action signal exists, judges whether the action signal reaches a predetermined sending frequency (if count is 4), determines a next sending time interval, and judges whether the action signal is an intra-station action, if the action signal is the intra-station action, encodes the intra-station action message, adds a multicast address, and writes the action message into the network card buffer for multicast sending; and if the substation action is the off-site action, encoding the off-site action message, adding a target address, writing the action message into a network card buffer area and sending the action message to a corresponding substation gateway.

The GOOSE sending module of the stabilizing device needs to send heartbeat messages and action signals, and both the heartbeat messages and the action signals need to face the inside of the transformer substation and between the transformer substations. When GOOSE messages are sent, whether the GOOSE messages are action signals inside the transformer substation needs to be judged to determine sending. Meanwhile, the GOOSE transmission inside and outside the transformer substation needs to be carried out according to the IEC61850 requirement repeated transmission mechanism for multiple times, so that reliable data transmission is ensured, and accidents such as misoperation caused by data packet interruption are avoided.

In an embodiment, a process of sending SV messages by a stabilizing device is as shown in fig. 5, in the SV communication module, after receiving a message, the stabilizing device filters out an address-specific message through a BPF filtering mechanism, determines whether the filtered message is an SV message, discards the SV message if the SV message is not the SV message, determines whether the SV message is a test message if the SV message is the SV message, compares the SV message with a stabilizing platen if the SV message is the test message to determine that the SV message is abnormal, calculates an effective value phase of a signal through fast fourier transform after resampling and linear difference if the SV message is not the test message, and transmits an amplitude value and the phase to a stabilizing corresponding function.

In an embodiment, as shown in fig. 6, in the SV communication module, before sending an SV message, the safety device determines whether an SV message sending period is reached, and if the SV message sending period is reached, encodes an electrical quantity to be sent, adds an MAC address of a target substation, and writes the SV message to a network card buffer for sending.

It can be understood that the GOOSE and SV communication modules of the stabilizing device are developed based on linux kernel, and both the GOOSE and SV communication modules include two receiving and sending sub-modules, and the original SOCKET PF _ SOCKET is used to realize the receiving and sending of the message. The receiving module filters the specified address message through a BPF filtering mechanism, which is beneficial to relieving processing pressure of a CPU and caching a network card, then analyzes the GOOSE or SV message, and sends corresponding information to a decision judgment module of the stabilization device. The GOOSE sending module combines the CID configuration file after receiving the action command and other requirements of the decision judging module, codes the command or the electrical quantity, adds the VLAN TAG, and then sends the VLAN TAG to a network between the transformer substations through the EOS interface.

GOOSE and SV communication in the station is used for reference when an inter-station communication interface of the stable device is developed. And an original SOCKET PF _ SOCKET under Linux is adopted for processing the message, and the SOCKET is used for receiving and transmitting an original data frame on an MAC layer, so that a user is allowed to complete the realization of each layer above the MAC in a user space. The PF _ SOCKET is defined in a manner similar to the SOCKET definition of the transport layer, and is created by using SOCKET (), SOCKET _ type needs to be set to SOCKET _ RAW, protocol is set to ETH _ P _ ALL, a network card needs to be set to a promiscuous mode, a buffer size needs to be set, and the like.

Illustratively, the partial code is as follows:

sock＝socket(PF_PACKET，SOCK_RAW，htons(ETH_P_ALL))；

strncpy(ifr.ifr_name，"eth0"，5)；

if(ioctl(sock，SIOCGIFFLAGS，&ifr)＝＝-1)

ifr.ifr_flags|＝IFF_PROMISC；

if(setsockopt(sock，SOL_SOCKET，SO_ATTACH_FILTER，&Filter，sizeof(Filter))<0)

optlen＝sizeof(rcv_size)；

err＝getsockopt(sock，SOL_SOCKET，SO_RCVBUF，&rcv_size，&optlen)；

rcv_size＝10*1024；

optlen＝sizeof(rcv_size)；

err＝setsockopt(sock，SOL_SOCKET，SO_RCVBUF，(char*)&rcv_size，optlen)；

because multicast information in a transformer substation is more, multicast address filtering needs to be carried out on messages, a BPF filtering mechanism is adopted, BPF filtering codes aiming at multicast addresses are compiled by analyzing BPF code generating rules and are automatically generated and embedded into a program, and the program automatically generates BPF filtering arrays and corresponding settings by reading required MAC address groups.

The GOOSE communication of the stabilizing device comprises the receiving and sending of the opening and closing information of an intelligent switch cabinet inside a transformer substation and the receiving and sending of a load cutting command of the stabilizing device between the transformer substations, the stabilizing GOOSE receiving module analyzes a GOOSE message after filtering effective messages through BPF, and the message content and GOOSE abnormal information are sent to the stabilizing logic control function block. When receiving, it needs to be noted that when the Test bit of the received GOOSE message is 1, the GOOSE action outlet of the stabilizing device needs to be locked, so as to prevent the received Test message from causing false operation of the stabilizing device.

It should be noted that, under the scenario of using the VPLS network, because the GOOSE messages passing between the substations are transmitted in the QinQ manner, when the GOOSE message of another substation enters the substation where the transformer substation is stable, the VLAN tag of the transformer substation is stripped, so that the GOOSE message is identical to the GOOSE message sent by the device in the same substation, and is equivalent to the GOOSE message sent by the device in the other substation by mapping, and thus, the mode of receiving the GOOSE message is the same as that of sending the GOOSE message to other devices in the substation. In the existing SDH mode, because the safety devices of different substations are connected to each other through an SDH network, the received GOOSE packet must be sent for other connected safety devices, and BPF filtering is not required for the GOOSE packet, but the safety device of which substation the packet comes from needs to be determined according to an MAC table or a gocbRef.

Under the situation of the VPLS network, GOOSE messages to be sent to other station stabilizing devices are sent to PE positions of substation outlets, and substation VLAN labels are added; in an SDH network, the process does not need to be carried out, and the stabilizing device directly places the GOOSE message to be sent to an E1 port; the two modes only have difference in output, and have no difference in communication with other measurement and control devices in the same transformer substation in the encoding process.

In this embodiment, the VPLS is adopted to realize point-to-multipoint communication, and the QinQ technology is used to realize that the communication of the security device between different substations is consistent with the communication of the devices in the substation, so as to realize point-to-multipoint transmission, avoid information loops, reduce security delay caused by forwarding, and meanwhile, ensure communication safety based on an encrypted channel protocol, and realize safe and reliable transmission of data messages.

It should be understood that, in the foregoing embodiment, the execution sequence of each step should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present invention.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. An inter-station communication method for a stable device, comprising:

establishing a tunnel communication connection between a first security and stabilization device and a second security and stabilization device based on a VPLS network, wherein the number of the second security and stabilization devices can be one or more;

and after receiving the GOOSE message, judging the first stabilizing device according to the VLAN ID, removing VLAN information, and forwarding the GOOSE message without the VLAN information to a second stabilizing device corresponding to the VLAN.

2. The method of claim 1, wherein establishing a first and second policing device tunneling connection based on the VPLS network comprises:

and when a fault occurs, reconstructing a communication tunnel based on the MPLS network architecture, and avoiding an information loop by configuring the MPLS.

3. The method of claim 1, wherein the first secure device broadcasting and sending GOOSE messages through the PE router group further comprises:

and after the stability of the stability device is judged, searching corresponding stable action measures in the strategy table according to the fault information and the operation mode so as to perform stability operation.

4. The method of claim 1, wherein the first safety device comprises a GOOSE communication module and an SV communication module, and wherein the second safety device comprises a GOOSE communication module and an SV communication module;

the GOOSE communication module and the SV communication module realize message receiving and sending through socket sockets.

5. The method according to claim 4, wherein in the GOOSE communication module, after receiving the message, the stabilizing device filters out the specified address message through a BPF filtering mechanism, determines whether the filtered message is a GOOSE message, analyzes the message if the GOOSE message is a GOOSE message, determines whether the GOOSE message indicates an abnormality, sends the abnormal message to a corresponding stabilizing function for stabilizing operation if the GOOSE message is abnormal, and sends the action information to the corresponding stabilizing function if the GOOSE message is normal.

6. The method according to claim 4, wherein in the GOOSE communication module, before sending the GOOSE message, the stabilizing device judges whether the device reaches a stable state according to the heartbeat message and the action signal, determines the next frame sending time interval according to the sending times of the action signal, determines whether the action signal is an intra-station action, and if the action signal is the intra-station action, encodes the intra-station action message, adds a multicast address, writes the action message into a network card buffer area for multicast sending;

and if the substation action is the off-site action, encoding the off-site action message, adding a target address, writing the action message into a network card buffer area and sending the action message to a corresponding substation gateway.

7. The method according to claim 4, wherein in the SV communication module, after receiving the message, the stabilizing device filters out the specified address message through a BPF filtering mechanism, judges whether the filtered message is an SV message, if the filtered message is an SV message, judges whether the filtered message is a test message, if the filtered message is an SV message, compares the test message with a stabilizing plate to judge whether the filtered message is abnormal, and if the filtered message is not a test message, calculates the effective value and phase of the signal through fast Fourier transform after resampling and linear difference, and transmits the amplitude and phase to the stabilizing corresponding function.

8. The method according to claim 4, wherein in the SV communication module, before sending the SV message, the stabilizing device judges whether an SV message sending period is reached, if the SV message sending period is reached, the electrical quantity required to be sent is coded, the MAC address of the target substation is added, and the SV message is written into a network card buffer area to be sent.

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