CN111064541A - Method for multiplexing high-low speed data transmission channel - Google Patents
Method for multiplexing high-low speed data transmission channel Download PDFInfo
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- CN111064541A CN111064541A CN201911310130.4A CN201911310130A CN111064541A CN 111064541 A CN111064541 A CN 111064541A CN 201911310130 A CN201911310130 A CN 201911310130A CN 111064541 A CN111064541 A CN 111064541A
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Abstract
The invention provides a method for multiplexing high and low speed data transmission channels, wherein data frames exchanged by two parties for data exchange consist of a high speed data section and a low speed data section; data exchange is carried out according to the data exchange period of the high-speed data; in each data exchange period, the high-speed data is completely written into a high-speed data section, and one part of the low-speed data is written into a low-speed data section; the low-speed data completes part of data exchange in each data exchange period, and completes all data exchange through a plurality of data exchange periods. The real-time exchange of high-speed data and the uploading of a large amount of low-speed data can be considered under the condition of effective data bandwidth. The low-speed data is sent in a segmented mode through the low-speed data field, so that the periodic exchange of a large amount of data with low refresh rate requirements can be met, and the bandwidth requirement on a transmission channel is not increased.
Description
Technical Field
The invention relates to the technical field of data transmission of a flexible direct current power transmission converter valve, in particular to a method for multiplexing a high-speed data transmission channel and a low-speed data transmission channel in a valve controller.
Background
As a power electronic device with high complexity, the flexible direct current transmission converter valve requires a valve controller with high computing capacity and data exchange capacity. The data exchange capability requirements for the valve controller are reflected in two aspects: firstly, high-speed acquisition and transmission of capacitance voltage, state and fault of a converter valve submodule are required based on periodic high-speed operation, and meanwhile, the IGBT switching state, control and protection commands of each power module obtained through calculation are rapidly issued; and secondly, a large amount of data with low change rate of the sub-modules needs to be acquired, stored, displayed and evaluated for health status. With the further increase of the intelligent degree of the gentle and direct current converter valve sub-module and the improvement of the gentle and direct current converter station direct current voltage level, data needing to be transmitted in a valve controller data exchange period increases sharply, the requirement cannot be met by means of an original single data exchange period, and a data exchange mechanism is urgently needed to meet the requirements of high-speed data period exchange and low-speed data uploading in large quantity.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method for multiplexing high-speed and low-speed data transmission channels, which can give consideration to both real-time exchange of high-speed data and upload of a large amount of low-speed data under the condition of effective data bandwidth.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-low speed data transmission channel multiplexing method, the data frame exchanged by both parties carrying out data exchange is composed of a high-speed data section and a low-speed data section; data exchange is carried out according to the data exchange period of the high-speed data; in each data exchange period, the high-speed data is completely written into a high-speed data section, and one part of the low-speed data is written into a low-speed data section; the low-speed data completes part of data exchange in each data exchange period, and completes all data exchange through a plurality of data exchange periods.
1) A data sending party periodically sends a first data frame to a data receiving party through a data transmission channel, and the data flowing direction is from the data sending party to the data receiving party;
2) the data receiving party periodically sends a data frame II to the data sending party through the data transmission channel, and the data flowing direction is from the data receiving party to the data sending party;
the data frame I consists of a high-speed data section and a low-speed data section, each data in the high-speed data section is a unique data with clear definition in each data interaction period, and the low-speed data section is divided into an address identifier and a data content; the address identifier and the data content relationship are as follows: the address identification is the storage position information of the first data in the data content in the data sender; the data content corresponds to continuous data starting from a first data storage address in a data sender, and the length is fixed; the address identification of the low-speed data field changes along with the data exchange period, the data content of the low-speed data field changes along with the address identification, and the low-speed data completes the complete transmission from a data sending party to a data receiving party after a plurality of data exchange periods;
and the second data frame is high-speed data, which comprises a low-speed data transmission mode and a transmission address. The transmission mode of the low-speed data designates that a data sender automatically increments the address identifier of the data frame I by a data exchange period, which is called a transmission mode I, or passively changes the address identifier according to the transmission address requirement of the data frame II, which is called a transmission mode II; the transmission address of the low-speed data specifies the address identification information of the data sender and the corresponding address continuous data content when the data sender transmits the low-speed data field in the next data exchange period under the second transmission mode.
Further, when the data sender works in the second transmission mode, the data receiver can choose to determine whether to retransmit the currently received low-speed data field in the next data exchange period according to the integrity and correctness check result of the data frame one.
Further, the receiving side of the low speed data can specify the mode of filling the low speed data into the low speed data segment by sending the data to the data sending side: firstly, the data sender automatically performs address offset increment of the low-speed data and low-speed data segment writing according to a data exchange period; secondly, the data sender writes the low-speed data segment according to the received low-speed data offset address command from the data receiver.
Further, in a manner that the data receiving side specifies the low-speed data offset address, the data receiving side may determine whether to perform incremental increase of the low-speed data offset address according to the received data frame check result, and does not perform incremental increase of the low-speed data offset address when the data receiving side receives a data frame check error, so as to trigger retransmission of the low-speed data.
Compared with the prior art, the invention has the beneficial effects that:
1. the proposed method for sending low-speed data in segments through the low-speed data field can meet the periodic exchange of a large amount of data with lower refreshing rate requirements without increasing the bandwidth requirement on a transmission channel;
2. the high-speed data field ensures the switching cycle requirement of high-speed data exchange of the original valve controller and does not influence the original control and protection functions and performances;
3. the two proposed transmission modes provide options for the reliability and integrity transmission of low-speed data, and provide a retransmission mechanism for low-speed data with higher integrity requirement.
Drawings
FIG. 1 is a data flow diagram of both parties of the data exchange of the present invention;
FIG. 2 is a schematic diagram of the composition of data frame 1 according to the present invention;
fig. 3 is a schematic diagram of the composition of the data frame 2 according to the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, in a method for multiplexing high and low speed data transmission channels, both parties performing data exchange need to perform periodic data exchange through the data transmission channels, and the exchanged data is divided into high speed data and low speed data according to the difference of the exchange period. The method comprises the following steps: the data frame exchanged by the two parties carrying out data exchange consists of a high-speed data section and a low-speed data section; data exchange is carried out according to the data exchange period of the high-speed data; in each data exchange period, the high-speed data is completely written into a high-speed data section, and one part of the low-speed data is written into a low-speed data section; the low-speed data completes part of data exchange in each data exchange period, and completes all data exchange through a plurality of data exchange periods.
The method comprises the following steps: a data sending party periodically sends data frames 1 to a data receiving party through a data transmission channel, and the data flowing direction is from the data sending party to the data receiving party; the data receiving side periodically sends data frames 2 to the data sending side through the data transmission channel, and the data flow direction is from the data receiving side to the data sending side.
As shown in fig. 2, the data frame 1 is composed of a high-speed data segment and a low-speed data segment, each data in the high-speed data segment is a well-defined unique data in each data interaction period, and the low-speed data segment is divided into two parts, namely an address identifier and a data content. The address identifier and the data content relationship are as follows: the data identification is the storage position information of the first data in the data content in the data sender. The data content corresponds to continuous data starting from a first data storage address in a data sender, and the length is fixed. The address identification of the low-speed data field changes with the data exchange period, the data content of the low-speed data field changes with the address identification, and the low-speed data completes the complete transmission from the data sending party to the data receiving party after a plurality of data exchange periods.
As shown in fig. 3, the data frame 2 contains high-speed data, which includes a low-speed data transmission mode and a transmission address. The transmission mode of the low-speed data specifies that a data sender automatically increments the address identifier of the data frame 1 in a data exchange period (called transmission mode one), or passively changes the address identifier according to the transmission address requirement of the data frame 2 (called transmission mode two). The transmission address of the low-speed data specifies the address identification information of the data sender and the corresponding address continuous data content when the data sender transmits the low-speed data field in the next data exchange period under the second transmission mode.
The first transmission mode is set when the control mode signal is 0, and the second transmission mode is set when the control mode signal is 1. When the data sender works in the second transmission mode, the data receiver can choose to determine whether to retransmit the currently received low-speed data field in the next data exchange period according to the integrity and correctness check result of the data frame 1.
In each data exchange period, the content of the low-speed data segment is written to comprise low-speed data initial address information and the fixed-length partial content of the low-speed data.
The receiver of the low-speed data can specify the mode of filling the low-speed data into the low-speed data segment by sending the data to the data sender: firstly, the data sender automatically performs address offset increment of the low-speed data and low-speed data segment writing according to a data exchange period; secondly, the data sender writes the low-speed data segment according to the received low-speed data offset address command from the data receiver.
Under the mode that the data receiver appoints the low-speed data offset address, the data receiver can decide whether to increase the low-speed data offset address according to the received data frame check result, and does not increase the low-speed data offset address when the data receiver receives the data frame check error so as to trigger the retransmission of the low-speed data.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (4)
1. A method for multiplexing high-low speed data transmission channel is characterized in that the data frame exchanged by two parties carrying out data exchange is composed of a high-speed data section and a low-speed data section; data exchange is carried out according to the data exchange period of the high-speed data; in each data exchange period, the high-speed data is completely written into a high-speed data section, and one part of the low-speed data is written into a low-speed data section; the low-speed data completes part of data exchange in each data exchange period and completes all data exchange through a plurality of data exchange periods;
1) a data sending party periodically sends a first data frame to a data receiving party through a data transmission channel, and the data flowing direction is from the data sending party to the data receiving party;
2) the data receiving party periodically sends a data frame II to the data sending party through the data transmission channel, and the data flowing direction is from the data receiving party to the data sending party;
the data frame I consists of a high-speed data section and a low-speed data section, each data in the high-speed data section is a unique data with clear definition in each data interaction period, and the low-speed data section is divided into an address identifier and a data content; the address identifier and the data content relationship are as follows: the address identification is the storage position information of the first data in the data content in the data sender; the data content corresponds to continuous data starting from a first data storage address in a data sender, and the length is fixed; the address identification of the low-speed data field changes along with the data exchange period, the data content of the low-speed data field changes along with the address identification, and the low-speed data completes the complete transmission from a data sending party to a data receiving party after a plurality of data exchange periods;
and the second data frame is high-speed data, which comprises a low-speed data transmission mode and a transmission address. The transmission mode of the low-speed data designates that a data sender automatically increments the address identifier of the data frame I by a data exchange period, which is called a transmission mode I, or passively changes the address identifier according to the transmission address requirement of the data frame II, which is called a transmission mode II; the transmission address of the low-speed data specifies the address identification information of the data sender and the corresponding address continuous data content when the data sender transmits the low-speed data field in the next data exchange period under the second transmission mode.
2. The method as claimed in claim 1, wherein when the data sender is operating in the transmission mode two, the data receiver can choose to determine whether to retransmit the currently received low-speed data field in the following data exchange period according to the integrity and correctness check result of the data frame one.
3. The method as claimed in claim 1, wherein the receiver of low-speed data can specify the way to fill the low-speed data into the low-speed data segment by sending data to the data sender: firstly, the data sender automatically performs address offset increment of the low-speed data and low-speed data segment writing according to a data exchange period; secondly, the data sender writes the low-speed data segment according to the received low-speed data offset address command from the data receiver.
4. The method as claimed in claim 1, wherein the data receiver determines whether to increment the low data offset address according to the received data frame check result in a manner that the data receiver specifies the low data offset address, and does not increment the low data offset address when the data receiver receives a data frame check error to trigger the retransmission of the low data.
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| CN103441960A (en) * | 2013-09-12 | 2013-12-11 | 南京鸿骏信息技术有限公司 | Real-time multi-business data communication multiplexing method of electric power system |
| CN105955901A (en) * | 2016-04-15 | 2016-09-21 | 中国电子科技集团公司第五十四研究所 | Enhancement-type large-capacity high-speed data exchange design method |
| CN106712907A (en) * | 2017-02-16 | 2017-05-24 | 北京中航通用科技有限公司 | Data transmission method and equipment |
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2019
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Patent Citations (8)
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| GB9814521D0 (en) * | 1997-07-04 | 1998-09-02 | Whitaker Corp | Data transmission method |
| CA2320306A1 (en) * | 1998-02-11 | 1999-08-19 | Shouhua Huang | Time division multiplexing expansion subsystem |
| CN1985477A (en) * | 2004-05-13 | 2007-06-20 | 高通股份有限公司 | Method and apparatus for allocation of information to channels of a communication system |
| CN101636975A (en) * | 2007-03-14 | 2010-01-27 | 三星电子株式会社 | System and method for wireless communication of uncompressed video having multiple destination aggregation (MDA) |
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Address after: 510620 No. 116 Tianhe Road, Guangzhou, Guangdong, Tianhe District Applicant after: CSG EHV POWER TRANSMISSION Co. Applicant after: Rongxin Huike Electric Co.,Ltd. Address before: 510620 No. 116 Tianhe Road, Guangzhou, Guangdong, Tianhe District Applicant before: CSG EHV POWER TRANSMISSION Co. Applicant before: RONGXIN HUIKE ELECTRIC TECHNOLOGY Co.,Ltd. |
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