CN115333965A - SV data processing method and system of high-voltage switch - Google Patents
SV data processing method and system of high-voltage switch Download PDFInfo
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- 230000006855 networking Effects 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/02—Capturing of monitoring data
- H04L43/028—Capturing of monitoring data by filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
- H04L47/323—Discarding or blocking control packets, e.g. ACK packets
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Abstract
The invention belongs to the field of electric power, and particularly relates to an SV data processing method and system of a high-voltage switch, wherein the method comprises the following steps: the SV data flow output by the high-voltage switch is collected; detecting characteristic quantities in the SV data stream and filtering the characteristic quantities; carrying out hash filtering on the same message and the key field of the application layer in the SV data stream; performing dynamic flow control on the SV data stream; and outputting the SV data stream subjected to the feature quantity filtering, the hash filtering and the dynamic flow control. SV data streams output by the acquisition switch are processed; suppressing storm messages by filtering the characteristic quantity; the same message and the key field of an application layer are subjected to Hash filtering to suppress storm messages; controlling the storm message through dynamic flow; and the processed SV data stream is output, so that the data volume of the SV data stream can be reduced, and the SV data processing efficiency can be improved.
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to an SV data processing method and system of a high-voltage switch.
Background
The high-voltage switch is an important device in a transformer substation, has the main functions of disconnecting a line and a fault point, and directly determines the safety and stability of a power grid according to the running state of the high-voltage switch. Although the traditional high-voltage switch equipment is visual in working state and easy to check and maintain, the equipment is frequently overhauled and has high failure rate, so that the safe operation of a power grid is threatened. With the development of the intelligent power grid, new requirements are made on high-voltage switch equipment, the high-voltage switch equipment not only needs to have the capacity of quickly and accurately breaking a circuit with long service life, but also can constantly acquire running parameters of the high-voltage switch equipment, judge the positions of the switches, connect data with spacer layer and station control layer equipment through SV and GOOSE networks, execute switching-on and switching-off commands transmitted by an upper layer system, and provide great convenience for fault troubleshooting, running maintenance and state maintenance.
The high-voltage switch protection device is an important testing tool for ensuring safe and reliable operation of a power system, and can analyze the power condition of the power system according to SV messages and perform corresponding protection measures on power equipment in the power system according to the analyzed power condition.
In the conventional technology, a bus protection device receives SV messages through optical fiber interfaces on the bus protection device, each optical fiber interface is used for receiving a message on one circuit in an electric power system, generally, a redundant optical fiber interface is provided for each optical fiber interface to ensure the reliability of message reception, and the size of the conventional bus protection device is fixed, so how to achieve reliable message reception on the basis of not changing the conventional protection device is a problem to be solved.
Disclosure of Invention
In order to solve or improve the problems, the invention provides an SV data processing method and system of a high-voltage switch, and the specific technical scheme is as follows:
the invention provides an SV data processing method of a high-voltage switch, which comprises the following steps: the SV data flow output by the high-voltage switch is collected; detecting characteristic quantities in the SV data stream and filtering the characteristic quantities; performing hash filtering on the same message and the key field of the application layer in the SV data stream; performing dynamic flow control on the SV data stream; and outputting the SV data flow subjected to the characteristic quantity filtering, the hash filtering and the dynamic flow control.
Preferably, the characteristic quantity includes a target MAC address, a message Ethertype and an APPID corresponding to the high-voltage switch.
Preferably, the performing hash filtering on the same packet and the key field of the application layer in the SV data stream includes: and filtering the same message and the key field of the application layer based on the two-dimensional Hash to suppress the storm message.
Preferably, the performing dynamic flow control on the SV data stream includes: and performing dynamic flow control on the SV data flow based on a preset processing model to suppress storm messages.
Preferably, the method is adapted to a processing apparatus provided with a CPU, and includes: comparing the SV data packet with the hash value of the previous frame every time the processing device receives 1 frame of SV data packet; if the values of the continuous n frames are the same, the comparison is carried out from n, and if the hash value of the following message is not changed, the CPU does not process the message from the nth frame.
Preferably, the CPU does not process the packet starting from the nth frame, and further includes: and if other messages are inserted into the messages from the nth frame, the CPU does not process the other messages.
Preferably, the method is suitable for a device provided with an FPGA, and correspondingly, the method further includes: after receiving the message, the processing device calculates hash values of TPID, TCI, APDU and CRC fields, and compares the hash values with a configured multicast table in the FPGA; the CPU only processes and compares the correct messages.
Preferably, the networking port counts the frequency of receiving correct messages, and if the frequency exceeds a threshold value in a window period, the networking port does not receive the message; and suspending reception of the SV data if the threshold is not reached within the window period.
The invention provides an SV data processing system of a high-voltage switch, comprising: the first unit is used for acquiring SV data stream output by the high-voltage switch; a second unit, configured to detect a feature quantity in the SV data stream, and filter the feature quantity; a third unit, configured to perform hash filtering on the same packet and the application layer key field in the SV data stream; a fourth unit, configured to perform dynamic flow control on the SV data stream; and a fifth unit, configured to output the SV data stream subjected to the feature quantity filtering, the hash filtering, and the dynamic flow control.
The beneficial effects of the invention are as follows: the SV data stream output by the switch is collected for processing; suppressing storm messages by filtering the characteristic quantity; the same message and the key field of an application layer are subjected to Hash filtering to suppress storm messages; through dynamic flow control, the storm message is suppressed; and the processed SV data stream is output, so that the data volume of the SV data stream can be reduced, and the SV data processing efficiency can be improved.
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FIG. 1 is a schematic diagram of a SV data processing method of a high voltage switch in accordance with the present invention;
FIG. 2 is a schematic diagram of an SV data processing system of a high voltage switch in accordance with the present invention.
Description of the main reference numerals:
1-first unit, 2-second unit, 3-third unit, 4-fourth unit, 5-fifth unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In order to solve or improve the problem of reliable SV data reception, the present invention provides an SV data processing method for a high-voltage switch as shown in fig. 1, including: the SV data flow output by the high-voltage switch is collected; detecting characteristic quantities in the SV data stream and filtering the characteristic quantities; carrying out hash filtering on the same message and the key field of the application layer in the SV data stream; performing dynamic flow control on the SV data stream; and outputting the SV data stream subjected to the feature quantity filtering, the hash filtering and the dynamic flow control.
The specific flow of SV data processing of the high-voltage switch may include:
step 1: and detecting characteristic quantities in the SV data stream of the intelligent high-voltage switch, and filtering the characteristic quantities.
And analyzing the SV configuration file during initialization, acquiring message characteristic quantities (specifically, a target MAC address, a message Ethertype and an APPID) of SV data output by each path of high-voltage switch, and inputting Fpga by using an interface function. And a CPU for processing data is arranged, and the CPU only processes the effective message which accords with the characteristic quantity and abandons other types of data frames.
And 2, step: and carrying out hash filtering on the same message in the SV data flow.
Every time the networking port receives 1 frame of SV data packet, the data packet is compared with the hash value of the previous frame, if the values of the continuous n frames are the same, the comparison is started from n, if the hash value of the following message is not changed, the CPU does not process the message started from the nth frame, and if other messages are inserted in the middle, the comparison is also effective.
And step 3: and carrying out hash filtering on the key fields of the application layer in the SV data flow.
After receiving the message, the networking port calculates hash values of fields such as TPID, TCI, APDU, CRC and the like, compares the hash values with a configured multicast table in the FPGA, and only processes the message with correct comparison by the CPU.
In order to improve the matching efficiency of the packet filtering and matching algorithm and the throughput of a data packet, the data packet filtering and matching algorithm based on geometric space segmentation and a hash table is provided, and the matching efficiency of the algorithm is improved by adopting a hash table matching rule on the basis of the geometric space segmentation. For the hash collision problem existing in the hash table lookup, the solution idea is as follows: the rule set is divided into a plurality of rule subsets with smaller scale through space division, and when a hash table is constructed by the rule subsets, the probability of hash collision is reduced; for the inevitable hash collision, a chain address method is adopted, a chain table is arranged in each unit of the hash table, and when the hash collision occurs, other data items which are also mapped to the position only need to be added into the chain table, so that the feasibility of the algorithm is ensured.
The packet filtering matching algorithm based on geometric space division and a hash table is divided into a decision tree and hash table establishing process and a data packet matching process. The process of establishing the decision tree and the hash table comprises the following two stages: in the first stage, a rule set is subjected to space geometric division according to matching dimensions so as to construct a decision tree; and in the second stage, a hash table is established according to the dimension information in the divided different rule subsets. The matching process of the data packet comprises the following two stages: the first stage, traversing the decision tree according to the matching dimension information of the data packet, and determining a hash table to be matched; and in the second stage, carrying out hash operation according to the dimension information of the data packet to obtain a corresponding hash value, so as to determine the finally matched rule.
As can be seen from the process of constructing the decision tree and the hash table, the process of searching and matching the data packet can be divided into a decision tree checking stage and a hash table checking stage. And in the decision tree checking stage, traversing the decision tree according to the matching dimension information of the data packet until the final leaf node. And determining the hash table to be searched in the next stage according to the leaf nodes found in the examination. In the hash table examination stage, hash operation is performed according to the dimension information of the data packet to obtain a corresponding hash value. And matching the linked list in the hash table according to the hash value. The time complexity of the matching process is O (1). And if the Hash collision occurs, sequentially matching the linked lists, wherein the time complexity of the matching process is O (n).
And 4, step 4: dynamic flow control is performed on the SV data streams.
The networking port counts the frequency of receiving correct messages, and if the frequency exceeds a threshold value in a window period, the networking port does not receive the message; and suspending reception of SV data if the threshold is not reached within the window period.
The characteristic quantity comprises a target MAC address, a message Ethertype and an APPID corresponding to the high-voltage switch.
The hash filtering of the same message and the key field of the application layer in the SV data stream includes:
and filtering the same message and the key field of the application layer based on the two-dimensional Hash to suppress the storm message.
The performing dynamic flow control on the SV data stream comprises:
and performing dynamic flow control on the SV data flow based on a preset processing model to suppress storm messages.
The method is applicable to a processing device provided with a CPU, and comprises the following steps:
comparing the SV data packet with the hash value of the previous frame every time the processing device receives 1 frame of SV data packets;
if the values of the continuous n frames are the same, the comparison is carried out from n, and if the hash value of the following message is not changed, the CPU does not process the message from the nth frame.
The CPU does not process the packet starting from the nth frame, and further includes:
and if other messages are inserted into the messages from the nth frame, the CPU does not process the other messages.
The processing device is provided with an FPGA, and correspondingly, the method also comprises the following steps: after receiving the message, the processing device calculates hash values of TPID, TCI, APDU and CRC fields, and compares the hash values with a configured multicast table in the FPGA; the CPU only processes the messages with correct comparison.
The processing device counts the frequency of receiving correct messages, and if the frequency exceeds a threshold value in a window period, the processing device does not receive the message; and suspending reception of the SV data if the threshold is not reached within the window period.
The invention provides an SV data processing system of a high-voltage switch as shown in fig. 2, comprising: the first unit 1 is used for acquiring SV data streams output by the high-voltage switch; a second unit 2, configured to detect a feature quantity in the SV data stream, and filter the feature quantity; a third unit 3, configured to perform hash filtering on the same packet and the application layer key field in the SV data stream; a fourth unit 4, configured to perform dynamic flow control on the SV data stream; a fifth unit 5, configured to output the SV data stream that has undergone the feature quantity filtering, the hash filtering, and the dynamic flow control.
The operation flow of the system comprises the following steps:
step 1: and detecting characteristic quantities in the data stream of the intelligent high-voltage switch SV, and filtering the characteristic quantities.
And analyzing the SV configuration file during initialization, acquiring the message characteristic quantity (specifically, a target MAC address, messages Ethertype and APPID) of the SV data output by each path of high-voltage switch, and inputting Fpga by using an interface function. And a CPU for processing data is arranged, the CPU only processes the effective message which accords with the characteristic quantity, and abandons other types of data frames.
Step 2: and carrying out hash filtering on the same message in the SV data flow.
Every time the processing device receives 1 frame of SV data packet, the data packet is compared with the hash value of the previous frame, if the values of the consecutive n frames are the same, the data packet is compared from n, if the hash value of the following message is not changed, the CPU does not process the message from the n frame, and if other messages are inserted, the data packet is also valid.
And step 3: and carrying out hash filtering on the key fields of the application layer in the SV data flow.
After receiving the message, the processing device calculates hash values of fields such as TPID, TCI, APDU, CRC and the like, compares the hash values with a configured multicast table in the FPGA, and only processes the message with correct comparison by the CPU.
In order to improve the matching efficiency of the packet filtering and matching algorithm and the throughput of the data packet, the data packet filtering and matching algorithm based on geometric space segmentation and a hash table is provided, and the algorithm adopts a hash table matching rule to improve the matching efficiency on the basis of the geometric space segmentation. For the hash collision problem existing in the hash table lookup, the solution idea is as follows: the rule set is divided into a plurality of rule subsets with smaller scale by space division, and when a hash table is constructed by the rule subsets, the probability of hash collision is reduced; for the inevitable hash collision, a chain address method is adopted, a chain table is arranged in each unit of the hash table, and when the hash collision occurs, other data items which are also mapped to the position only need to be added into the chain table, so that the feasibility of the algorithm is ensured.
The packet filtering matching algorithm based on geometric space division and the hash table is divided into a decision tree and hash table establishing process and a data packet matching process. The decision tree and hash table establishment process comprises the following two stages: in the first stage, a rule set is subjected to space geometric division according to matching dimensions so as to construct a decision tree; and in the second stage, a hash table is established according to the dimension information in the divided different rule subsets. The matching process of the data packet comprises the following two stages: the first stage, according to the matching dimension information of the data packet, traversing the decision tree and determining the hash table to be matched; and in the second stage, carrying out hash operation according to the dimension information of the data packet to obtain a corresponding hash value, so as to determine the finally matched rule.
As can be seen from the process of constructing the decision tree and the hash table, the process of searching and matching the data packet can be divided into a decision tree checking stage and a hash table checking stage. And in the decision tree checking stage, traversing the decision tree according to the matching dimension information of the data packet until the final leaf node. And determining the hash table to be searched in the next stage according to the leaf nodes found in the examination. In the hash table examination stage, hash operation is performed according to the dimension information of the data packet to obtain a corresponding hash value. And matching the linked list in the hash table according to the hash value. The time complexity of the matching process is O (1). And if the Hash collision occurs, sequentially matching the linked lists, wherein the time complexity of the matching process is O (n).
And 4, step 4: dynamic flow control is performed on the SV data streams.
The system counts the frequency of receiving correct messages, and if the frequency exceeds a threshold value in a window period, the system does not receive the path of messages; and suspending reception of SV data if the threshold is not reached within the window period.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations thereof, and that the components of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the division of the unit is only one division of logical functions, and other division manners may be used in actual implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. An SV data processing method of a high-voltage switch is characterized by comprising the following steps:
the SV data flow output by the high-voltage switch is collected;
detecting characteristic quantities in the SV data stream and filtering the characteristic quantities;
performing hash filtering on the same message and the key field of the application layer in the SV data stream;
performing dynamic flow control on the SV data stream;
and outputting the SV data flow subjected to the characteristic quantity filtering, the hash filtering and the dynamic flow control.
2. The SV data processing method as recited in claim 1 wherein the characteristic quantities comprise a target MAC address, a message Ethertype and an APPID corresponding to the high voltage switch.
3. The SV data processing method of claim 1, wherein the hash filtering the same packet and application layer key field in the SV data stream comprises:
and filtering the same message and the key field of the application layer based on the two-dimensional Hash to suppress the storm message.
4. A SV data processing method for a high voltage switch according to claim 1, characterized in that said performing dynamic flow control on said SV data stream comprises:
and performing dynamic flow control on the SV data flow based on a preset processing model to suppress storm messages.
5. An SV data processing method for a high-voltage switch according to claim 1, which is applied to a processing apparatus provided with a CPU, characterized by comprising:
comparing the SV data packet with the hash value of the previous frame every time the processing device receives 1 frame of SV data packets;
if the values of the continuous n frames are the same, the comparison is carried out from n, and if the hash value of the following message is not changed, the CPU does not process the message from the nth frame.
6. An SV data processing method as recited in claim 5 wherein the CPU does not process the message starting from the nth frame, further comprising:
and if other messages are inserted into the messages from the nth frame, the CPU does not process the other messages.
7. An SV data processing method as claimed in claim 5, wherein the processing means is provided with an FPGA, respectively,
the method further comprises the following steps:
after receiving the message, calculating hash values of TPID, TCI, APDU and CRC fields, and comparing the hash values with a configured multicast table in the FPGA;
the CPU only processes and compares the correct messages.
8. An SV data processing method as recited in claim 5 wherein said networking port counts the frequency of receiving the correct message, and if the frequency exceeds a threshold value within a window period, said packet is not received again;
and suspending reception of the SV data if the threshold is not reached within the window period.
9. An SV data processing system for a high voltage switch, comprising:
the first unit is used for acquiring SV data stream output by the high-voltage switch;
a second unit, configured to detect a feature quantity in the SV data stream, and filter the feature quantity;
a third unit, configured to perform hash filtering on the same packet and the key field of the application layer in the SV data stream;
a fourth unit, configured to perform dynamic flow control on the SV data stream;
and a fifth unit, configured to output the SV data stream that has undergone the feature quantity filtering, the hash filtering, and the dynamic flow control.
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