CN109309682B - FT 3-IEC 61850-9-2 protocol conversion method and system for digital metering - Google Patents
FT 3-IEC 61850-9-2 protocol conversion method and system for digital metering Download PDFInfo
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Abstract
The invention discloses a method for converting FT3 to IEC61850-9-2 protocol for digital metering, which comprises the following steps: setting preset parameters according to an input device, and receiving an FT3 data frame; acquiring FT3 data frames in real time according to a high-frequency clock to obtain a real-time sampling value; analyzing the sampling value of the FT3 data frame based on Manchester coding to obtain receiving information; acquiring actual data according to the real-time sampling value, the acceptance information and a preset scale factor; acquiring IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, actual data and a preset scale factor; according to the method and the system, the FT3 data frames are sampled by using Manchester coding, the information carried by the FT3 data is analyzed, and the information is framed again according to the IEC61850-9-2 rule, so that the conversion from the FT3 signal specified in the IEC60044-8 standard to the digital message signal under the IEC61850-9-2 standard is effectively realized, and the problem of signal mismatch in the using process of the digital metering test equipment is solved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a system for converting FT 3-IEC 61850-9-2 protocol for digital metering.
Background
The traditional electronic electric energy metering system consists of an electromagnetic mutual inductor and an electronic electric energy meter, a large number of cables are used for transmitting signals, and error factors are numerous. With the digital change of an electric energy metering system, the electronic transformer (comprising a merging unit) replaces the traditional electromagnetic transformer, a large number of wires and cables are replaced by optical fiber communication, and the electronic electric energy meter is also replaced by the digital electric energy meter. The digital electric energy metering insulation structure is simple, the danger of explosion and secondary open circuit is avoided, digital signals are shared more easily, and the load capacity is high.
In recent years, intelligent substations are used as an important link for building intelligent power grids and are popularized and built all over the country. Meanwhile, the development of the networking of the secondary equipment of the intelligent substation puts higher requirements on related intelligent substation testing and checking instruments. Most of related equipment for installation, debugging and field testing of the existing intelligent substation system only supports IEC61850-9-2 digital message input. How to effectively convert an FT3 signal output by a system into a digital message signal meeting IEC61850-9-2 standard is a hotspot problem to be considered for digital metering test of an intelligent substation, the construction of the intelligent substation at home and abroad is still in a preliminary development stage at present, the conversion from FT3 to the IEC61850-9-2 format is completely realized by depending on a merging unit, and the merging unit is used as one of main core devices of the intelligent substation, has the characteristics of complex function and high price, so that the working period of field installation and debugging is long, and the debugging and detection of FT3 output devices are influenced.
Disclosure of Invention
In order to solve the problems of high cost and long time consumption of the existing conversion from FT3 to IEC61850-9-2 format which depends on a merging unit completely in the background technology, the invention provides a method and a system for converting FT3 to IEC61850-9-2 protocol for digital metering, wherein the method and the system sample FT3 data frames by using Manchester coding and analyze information carried by FT3 data, and perform framing on the information again according to IEC61850-9-2 rules to realize the conversion of data formats; the FT 3-to-IEC 61850-9-2 protocol conversion method for digital metering comprises the following steps:
setting preset parameters according to input equipment, and receiving an FT3 data frame;
acquiring FT3 data frames in real time according to a high-frequency clock to obtain a real-time sampling value;
analyzing the sampling value of the FT3 data frame based on Manchester coding to obtain receiving information;
acquiring actual data according to the real-time sampling value, the received information and a preset scale factor, wherein the scale factor is used for determining the proportion of the sampling value and the received information in each sampling;
and acquiring IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, the actual data and a preset scale factor.
Further, by identifying the edge of the Manchester code, analyzing to obtain receiving information; the received information includes a data set length, a logical node name, a data set name, a logical device name, a rated phase current, a rated neutral point current, a rated type voltage, a rated neutral point voltage, a rated delay time, a sample counter, and a status word.
Further, the data set length is determined according to the data set length without a header and is expressed by octet; the name of the logic node is a name value of the logic node in point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the allocation of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logical device name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment awakening, a synchronous interpolation method, a synchronous status and a channel data valid status.
Further, the FT3 data frame comprises N data blocks, wherein N is more than or equal to 3;
the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
Further, the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
The FT 3-to-IEC 61850-9-2 protocol conversion system for digital metering comprises:
an FT3 receiving unit, the FT3 receiving unit is used for setting preset parameters according to input equipment and receiving FT3 data frames;
the acquisition unit is used for acquiring FT3 data frames in real time according to a high-frequency clock to obtain a real-time sampling value;
the analysis unit is used for analyzing the real-time sampling value acquired by the acquisition unit based on Manchester coding to obtain received information;
the actual data calculation unit is used for obtaining actual data according to the real-time sampling value, the received information and a preset scale factor, and the scale factor is used for determining the proportion of the sampling value and the received information in each sampling;
and the conversion unit is used for obtaining IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, the actual data and the preset scale factor.
Further, the parsing unit is configured to parse and obtain the received information by identifying an edge of the manchester code; the received information includes a data set length, a logical node name, a data set name, a logical device name, a nominal phase current, a nominal neutral current, a nominal type voltage, a nominal neutral voltage, a nominal delay time, a sample counter, and a status word.
Further, the data set length is determined according to the data set length without a header and is expressed by octet; the name of the logical node is a logical node name value of point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the allocation of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logical device name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment awakening, a synchronous interpolation method, a synchronous status and a channel data valid status.
Further, the FT3 data frame comprises N data blocks, wherein N is more than or equal to 3; the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
Further, the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
The invention has the beneficial effects that: the technical scheme of the invention provides a method and a system for converting FT3 to IEC61850-9-2 protocol for digital metering, wherein the method and the system sample an FT3 data frame by using Manchester coding, analyze information carried by FT3 data, and perform framing on the information again according to IEC61850-9-2 rules, thereby effectively realizing the conversion of an FT3 signal specified in the IEC60044-8 standard to a digital message signal under the IEC61850-9-2 standard and solving the problem of signal mismatch in the using process of digital metering test equipment.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flowchart of a FT 3-to-IEC 61850-9-2 protocol conversion method for digital metering according to an embodiment of the present invention;
fig. 2 is a structural diagram of an FT 3-to-IEC 61850-9-2 protocol conversion system for digital metering according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 is a flowchart of a FT 3-to-IEC 61850-9-2 protocol conversion method for digital metering according to an embodiment of the present invention; as shown in fig. 1, the method includes:
in the present embodiment, the input device includes an electronic transformer, such as an electronic voltage transformer and an electronic current transformer; by setting parameters matching the input device, communication preparation is completed to receive data frames sent by the FT3 input device. In this embodiment, the data frame sent by the FT3 input device is received by a laser receiver.
the method and the device use the high-frequency clock to acquire signals so as to obtain a more accurate acquisition result;
further, by identifying the edge of the Manchester code, analyzing to obtain receiving information; the received information includes a data set length, a logical node name, a data set name, a logical device name, a nominal phase current, a nominal neutral current, a nominal type voltage, a nominal neutral voltage, a nominal delay time, a sample counter, and a status word.
Further, the data set length is determined according to the data set length without a header and is expressed by octet; the name of the logic node is a name value of the logic node in point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the distribution of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logic equipment name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment awakening, a synchronous interpolation method, a synchronous status and a channel data valid status.
The FT3 data frame comprises N data blocks, wherein N is more than or equal to 3; the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
In this embodiment, the FT3 data frame includes three data blocks when it is a standard frame, and includes four data blocks when it is an extended frame; the data set length is expressed in eight bytes, the standard frame length is 44 (decimal), and the extended frame length is 62 (decimal); the value of the logical node name is 02 (hexadecimal); rated phase current and rated neutral point current are given by a square root mean value, unit A; rated phase voltage and rated neutral point voltage are multiplied by 10 √ 3 for transmission; nominal delay is given in microseconds (μ s); the range of the sample counter under the sampling rate of 4K is 0-3999, when external synchronization exists, the sample counter is set to zero along with the appearance of each synchronization pulse, and when external synchronization does not exist, the sample counter is automatically turned over according to the sampling rate; the status word comprises two fields of a status word 1 and a status word 2, each bit in the fields represents a status, wherein the status word 1 comprises information such as equipment maintenance, running status, equipment wakeup, synchronous interpolation method, synchronous status, channel data valid status, and the like, each bit in the status word 2 represents the valid status of data on the channels 8 to 22, and more bits are reserved for standby.
further, the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
The scale factor is used for determining the proportion of a real-time sampling value and received information in actual data corresponding to each sampling in a time sequence;
specifically, when the rated value range-flag is a preset value, the scale factor is taken according to the following rule:
when the rated value range-flag is 0, the scale factors for measurement, protection and metering are 2D41, 01CF and 2D41 in hexadecimal respectively;
when the rated value range-flag is 1, the scale factors for measurement, protection and metering are 2D41, 00E7 and 2D41 in hexadecimal.
And 150, acquiring IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, the actual data and the preset scale factor.
And sending the IEC61850-9-2 sampling value data to output equipment through an optical fiber interface.
Fig. 2 is a structural diagram of an FT 3-to-IEC 61850-9-2 protocol conversion system for digital metering according to an embodiment of the present invention. As shown in fig. 2, the system includes:
an FT3 receiving unit 210, the FT3 receiving unit 210 being configured to set preset parameters according to an input device and receive an FT3 data frame;
the acquisition unit 220 is used for acquiring FT3 data frames in real time according to a high-frequency clock to obtain real-time sampling values;
an analyzing unit 230, where the analyzing unit 230 is configured to analyze the real-time sampling value acquired by the acquiring unit 220 based on manchester encoding to obtain received information;
further, the parsing unit 230 is configured to parse the received information by identifying an edge of the manchester code; the received information includes a data set length, a logical node name, a data set name, a logical device name, a rated phase current, a rated neutral point current, a rated type voltage, a rated neutral point voltage, a rated delay time, a sample counter, and a status word.
Further, the data set length is determined by the data set length without a header and is expressed by octets; the name of the logic node is a name value of the logic node in point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the allocation of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logic equipment name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment awakening, a synchronous interpolation method, a synchronous status and a channel data valid status.
Further, the FT3 data frame comprises N data blocks, wherein N is more than or equal to 3;
the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
An actual data calculating unit 240, where the actual data calculating unit 240 is configured to obtain actual data according to the real-time sampling value, the received information, and a preset scaling factor;
further, the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
A conversion unit 250, wherein the conversion unit 250 is configured to obtain IEC61850-9-2 sample value data according to the IEC61850-9-2 framing method, the actual data, and the preset scale factor.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those of skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as devices or system programs (e.g., computer programs and computer program products) for performing some or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website, or provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
While the foregoing is directed to embodiments of the present disclosure, it is noted that various improvements, modifications, and changes may be made by those skilled in the art without departing from the spirit of the present disclosure, and it is intended that such improvements, modifications, and changes fall within the scope of the present disclosure.
Claims (10)
1. A FT3 to IEC61850-9-2 protocol conversion method for digital metering, the method comprising:
setting preset parameters according to an input device, and receiving an FT3 data frame;
acquiring FT3 data frames in real time according to a high-frequency clock to obtain a real-time sampling value;
analyzing the sampling value of the FT3 data frame based on Manchester coding to obtain receiving information;
acquiring actual data according to the real-time sampling value, the receiving information and a preset scale factor, wherein the scale factor is used for determining the proportion of the sampling value and the receiving information in each sampling;
and acquiring IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, the actual data and a preset scale factor.
2. The method of claim 1, wherein: analyzing and acquiring received information by identifying the edge of the Manchester code; the received information includes a data set length, a logical node name, a data set name, a logical device name, a rated phase current, a rated neutral point current, a rated type voltage, a rated neutral point voltage, a rated delay time, a sample counter, and a status word.
3. The method of claim 2, wherein: the data set length is determined according to the data set length without a header and is expressed by octets; the name of the logical node is a logical node name value of point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the distribution of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logic equipment name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment wakeup, a synchronous interpolation method, a synchronous status and a channel data valid status.
4. The method of claim 1, wherein: the FT3 data frame comprises N data blocks, wherein N is more than or equal to 3;
the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
5. The method of claim 1, wherein: the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
6. An FT3 to IEC61850-9-2 protocol conversion system for digital metering, the system comprising:
an FT3 receiving unit, the FT3 receiving unit is used for setting preset parameters according to input equipment and receiving FT3 data frames;
the acquisition unit is used for acquiring FT3 data frames in real time according to a high-frequency clock to obtain a real-time sampling value;
the analysis unit is used for analyzing the real-time sampling value acquired by the acquisition unit based on Manchester coding to obtain received information;
the actual data calculation unit is used for obtaining actual data according to the real-time sampling value, the received information and a preset scale factor, and the scale factor is used for determining the proportion of the sampling value and the received information in each sampling;
and the conversion unit is used for obtaining IEC61850-9-2 sampling value data according to the IEC61850-9-2 framing method, the actual data and the preset scale factor.
7. The system of claim 6, wherein: the analyzing unit is used for analyzing and obtaining receiving information by identifying the edge of the Manchester code; the received information includes a data set length, a logical node name, a data set name, a logical device name, a nominal phase current, a nominal neutral current, a nominal type voltage, a nominal neutral voltage, a nominal delay time, a sample counter, and a status word.
8. The system of claim 7, wherein: the data set length is determined according to the data set length without a header and is expressed by octets; the name of the logical node is a logical node name value of point-to-point connection specified in IEC60044-8 standard; the data set name is used for determining the allocation of the data channel, when the value of the data set name is hexadecimal 01, the data channel is represented as standard channel mapping, and when the value of the data set name is hexadecimal FE, the data channel is represented as extended channel mapping; the logic equipment name is used for identifying a data set signal source and determining a data source; each bit in the field of the status word is used for representing a status of corresponding information, wherein the information comprises equipment maintenance, running status, equipment awakening, a synchronous interpolation method, a synchronous status and a channel data valid status.
9. The system of claim 6, wherein: the FT3 data frame comprises N data blocks, wherein N is more than or equal to 3;
the first three data blocks are standard frame data blocks, and the first data block in the first three data blocks is used for storing data corresponding to the received information; one or more data blocks other than the first three data blocks are used to extend the number of sampling channels.
10. The system of claim 6, wherein: the preset scale factors are respectively determined according to different types of receiving equipment output after being converted into IEC 61850-9-2; the equipment types comprise protection equipment, measurement and control equipment and metering equipment.
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