WO2012164665A1

WO2012164665A1 - Communication device

Info

Publication number: WO2012164665A1
Application number: PCT/JP2011/062396
Authority: WO
Inventors: 靖則伊戸
Original assignee: 三菱電機株式会社
Priority date: 2011-05-30
Filing date: 2011-05-30
Publication date: 2012-12-06
Also published as: GB201315042D0; GB2501660A; KR20130132650A; CN103563308A; JPWO2012164665A1

Abstract

In this plant monitoring control device (10) which receives communication packets including data collected at a plurality of data collection devices (19) from a network (process bus) (18), apart from a processing unit (A12) which performs logic computation processing and a processing unit (C14) which performs arithmetic computation processing, a processing unit (B13) which is dedicated hardware for performing data extraction processing for extracting specific data from received communication packets is provided. The processing unit (B13) performs data extraction processing at high speed, and therefore, it is possible to streamline data extraction processing so that packet reception, data extraction, and computation become possible at short time cycles.

Description

Communication device

The present invention relates to a technique for improving the efficiency of extracting data from received communication packets.

For example, in substation monitoring and control, the monitoring and control device (protection relay device) collects and calculates the amount of electricity (current and voltage) of the power transmission line and bus, and when an abnormality is detected, GIS (Gas Insulated Switch-Gear, gas Insulation switchgear) is controlled to prevent the inflow of abnormal current, thereby suppressing the spread of accidents to the power system.
The monitoring and control device is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a communication interface, and the like, and the CPU performs processing of electric quantity and abnormality detection. .
Also, in recent years, the amount of electricity (current and voltage) of power transmission lines and buses is collected by a data collection device (merging unit), and the amount of electricity is sent to the monitoring control device (protection relay device) via network (process bus) communication. The method to do is standardized.
In addition, there exists a technique of patent document 1 as a technique relevant to this invention.

Japanese Patent Laid-Open No. 11-341706

The interval at which the monitoring and control device receives and calculates data is as short as several tens to several hundreds of microseconds. When a large number of data collection devices are arranged on the process bus, the monitoring and control device receives and receives data with a single data processing means. When the calculation is performed, the processing load of the data processing unit increases, and there is a problem that it is difficult to perform data reception / calculation processing in a short cycle.

One of the main objects of the present invention is to solve the above-mentioned problems, which makes it possible to efficiently extract data from received communication packets, and enables packet reception, data extraction and calculation in a short cycle. The main purpose is to.

The communication device according to the present invention is
A communication device that receives a packet including a plurality of data,
It has a dedicated hardware for data extraction processing for extracting data that matches a specific condition from the plurality of data of the received packet.

According to the present invention, since dedicated hardware for data extraction processing is provided, the process of extracting data that matches a specific condition from the received communication packet is made more efficient, packet reception in a short cycle, data extraction and Calculation is possible.

The figure which shows the structural example of the plant monitoring control apparatus which concerns on Embodiment 1. FIG. The figure which shows the operation example of the plant monitoring control apparatus which concerns on Embodiment 1. FIG. The figure which shows the operation example of the plant monitoring control apparatus which concerns on Embodiment 1. FIG. FIG. 10 is a diagram illustrating a configuration example of an SV packet according to the second embodiment. The flowchart figure which shows the operation example of the plant monitoring control apparatus which concerns on Embodiment 2. FIG. FIG. 6 is a diagram showing the contents stored in a decode programming register according to the second embodiment. The figure which shows the hierarchical structure of the packet of IEC61850-9-2 standard. The figure which shows the hardware structural example of the plant monitoring control apparatus which concerns on

Embodiment

1 and 2. FIG.

Embodiment 1 FIG.
In this embodiment, a plurality of processing units and a management unit that distributes the processing to each processing unit are provided, and the processing performance is improved by dividing and executing the processing in parallel, and short-period reception / calculation is performed. A plant monitoring control device capable of processing will be described.

FIG. 1 shows a configuration example of a plant monitoring control apparatus according to the present embodiment.

In FIG. 1, a plant monitoring control device 10 performs plant monitoring control.
The plant monitoring control device 10 is, for example, a protection relay device.
The plant monitoring control device 10 is connected to a plurality of data collection devices 19 via a network (process bus) 18.
The data collection device 19 collects a value of electric quantity (current value, voltage value) in a predetermined object and sends a communication packet notifying the collected value of electric quantity to the network (process bus) 18.
The plant monitoring and control device 10 receives communication packets from a plurality of data collection devices 19 in a short cycle (a cycle of several tens to several hundreds of microseconds), and extracts a target value of electricity from the received communication packets.
The plant monitoring control device 10 is an example of a communication device.

In the plant monitoring and control apparatus 10, the process bus transmission / reception unit 11 transmits and receives communication packets to and from the network (process bus) 18.
The processing unit A12 performs logical operation processing such as data determination and communication packet generation.
The processing unit B13 performs a data extraction process (hereinafter, the data extraction process is also referred to as a decoding process) for extracting specific data from a specific communication packet at high speed.
The processing unit C14 performs numerical calculation processing of analog input data such as current value and voltage value at high speed.
The management unit 15 performs processing distribution of the processing units A12 to C14.
The data holding unit A <b> 16 stores communication packets received from the network (process bus) 18 by the process bus transmission / reception unit 11.
The data holding unit B17 stores the data extracted by the processing unit B13.

For example, the processing unit A12 is a general-purpose CPU, the processing unit B13 is dedicated hardware specialized for data extraction processing, and the processing unit C14 is a numerical calculation CPU.
Further, the processing unit A12 and the processing unit C14 do not need to be separate parts. For example, the processing unit A12 and the processing unit C14 are configured by using a processor component on which a general-purpose CPU and an FPU (Floating Point number processing Unit) are mounted. It can also be realized by a single LSI (Large Scale Integration).

Next, the operation will be described with reference to FIGS.
FIG. 2 shows an operation when a received packet from the network (process bus) 18 is a processing target of the processing unit B13.

The process bus transmission / reception unit 11 stores the received packet from the network (process bus) 18 in the data holding unit A16 (step 20).

The management unit 15 determines the type of the received packet in the data holding unit A16 and determines which of the processing unit A12 and processing unit B13 should process (step 21).
As described above, the processing unit B13 is dedicated hardware that decodes an SV (Sampled Value) packet that is a communication packet for transmitting and receiving analog input data.

When determining that the type of the received packet is an SV packet, the management unit 15 instructs the processing unit B13 to decode the SV packet, and the processing unit B13 performs the decoding process of the SV packet (step 22).
The SV packet decoding process is a process of analyzing the structure of the SV packet and extracting data necessary for the current / voltage value calculation performed by the processing unit C14.
In the SV packet decoding process, the processing unit B13 decodes the received packet in the data holding unit A16, extracts necessary data, and stores it in the data holding unit B17.

The management unit 15 that has detected the end of the SV packet decoding process activates the current / voltage value calculation of the processing unit C14 (step 23).

The processing unit C14 reads the current / voltage value data (the data extracted by the processing unit B13 and stored in the data holding unit B17) in the data holding unit B17, and performs calculations necessary for determining the state of the monitoring control target ( Step 24).

The management unit 15 that has detected the end of the current / voltage value calculation process activates the state determination process of the processing unit A12 (step 25).

The processing unit A12 determines whether there is an abnormality in the monitoring control target based on the result of step 24.
Then, the processing unit A12 performs necessary plant control processing according to the determination result (step 26).

FIG. 3 shows an operation when a packet received from the network (process bus) 18 is both a processing target (SV packet) of the processing unit B13 and a non-processing target.
Note that the processing at the time of reception of the SV packet is the same as that in steps 20 to 26 described above, and therefore description thereof is omitted here.

The management unit 15 determines the type of the received packet in the data holding unit A16, and determines which of the processing unit A12 and the processing unit B13 should process.
In this example, it is assumed that a communication packet to be executed by the processing unit A12, for example, operation state data of the data collection device 19 is acquired, and it is determined that the processing unit A12 should process (step 31).
The processing unit A12 determines the state of the data collection device 19 (step 32).

Embodiment 2. FIG.
In the second embodiment, details of the SV (Sampled Value) packet decoding process performed by the processing unit B13 described in the first embodiment will be described.

FIG. 4 shows the structure of a communication packet that is transmitted and received by the plant monitoring and control apparatus 10 via the network (process bus) 18.
Reference numeral 40 denotes a header part of the communication packet, 41 denotes a data part, and 42 denotes a footer part.
43 is an attribute number of data, 44 is a data length, and 45 is data.
The data part 41 stores a plurality of data 43 to 45.
The attribute number 43 is an identifier of the data 45.
In addition, the data 45 indicates the identification number and state data of the data collection device 19, the value of electric quantity (current value, voltage value) collected by the data collection device 19, and the like.

In the present embodiment, the decoding process refers to a process of interpreting the attribute number 43 and the data length 44, extracting necessary data 45, and adding dummy data so as to be suitable for the processing of the processing unit C14.
For example, when the processing unit C14 is a 32-bit CPU, the processing efficiency is best when the data is stored in units of 4 bytes, but actually the data length of the extracted data is a multiple of 4 bytes. Since it is not limited, the processing unit B13 adds dummy data (padding) so that the 4-byte alignment is not lost.

Data to be extracted from the SV packet is set in the decode programming register 58 in advance.
Data 45 that follows the same attribute number 43 as the attribute number described in the decode programming register 58 is the data to be extracted.
The decode programming register 58 is arranged in the processing unit B13, for example.
In the decode programming register 58, as shown in FIG. 6, the number of padding is defined for the attribute number.
The number of paddings is the number of dummy data added to the extracted data.
Since the structure of the communication packet does not change dynamically during operation, the number of paddings in the decode programming register 58 need only be set once when the power is turned on, for example.

Next, the decoding process of the processing unit B13 will be described with reference to FIG.

First, the processing unit B13 reads the attribute number 43 from the communication packet stored in the data holding unit A16 (step 51).

Next, the processing unit B13 compares the read attribute number 43 with the decode programming register 58, and determines whether or not the data following the read attribute number 43 is data to be extracted (step 52).
That is, if the read attribute number 43 matches the attribute number described in the decode programming register 58, the processing unit B13 determines that the data following the read attribute number 43 is an extraction target.

If the data is an extraction target (YES in step 52), the processing unit B13 reads the target data from the data holding unit A16 and stores it in the data holding unit B17 (step 53).

Next, the processing unit B13 determines whether or not the data stored in the data holding unit B17 requires padding processing (processing for storing dummy values for 32-bit alignment) with reference to the decoding programming register 58. (Step 54).
That is, if the number of paddings other than “0” is defined for the attribute number 43 read in step 51 in the decode programming register 58, it is determined that padding is necessary.

When padding is required, dummy data for the necessary bytes is stored in the data holding unit B17. For example, if the number of paddings is 2, dummy data for 2 bytes (for example, value “0”) is written to the data holding unit B17 (step 55).

Then, the processing unit B13 performs the above steps 51 to 55 for all the data units 41 in FIG. 4 (step 56), and ends the decoding process when the processing for all the data units 41 is completed (step 56). Step 57).

The communication packet data portion 41 shown in FIG. 1 (Abstract Syntax Notation 1) is assumed and a hierarchical structure based on Tag (attribute number) + Length (data length) + Value (data) is adopted.
Specifically, it has a hierarchical structure shown in FIG. 7 (FIG. 7 is cited from the IEC 61850-9-2 standard).
7 corresponds to the attribute number 43 in FIG. 4 (the portion where 60, 80 to 87, A2, and 30 are shown in FIG. 7).
7 corresponds to the data length 44 shown in FIG. 4. The length shown in FIG.
Further, Value in FIG. 7 corresponds to data 45 in FIG.
For example, the data 45 associated with the first stage Tag and Length (60 and L) is all the data below the second stage (80, L and Value).
Further, the data 45 associated with the fourth stage Tag and Length (A2 and L) is all the data below the fifth stage (30 and L).
Data 45 associated with the fifth stage Tag and Length (30 and L) is data in a range covered by ASDU (Application Service Data Unit) 1.
In addition, the internal configuration of ASDU2, ASDU3, and ASDUn in FIG. 7 is the same as that of ASDU1.
As a decoding process, the processing unit B13 extracts a value necessary for the processing of the processing unit C14 from the hierarchical structure of FIG.
The decoding processing method in the hierarchical structure of FIG. 7 is shown in (1) to (10) on the right side of FIG.
As shown in FIG. 7, the processing unit B13 analyzes the hierarchical structure of the received SV packet, and extracts data included in ASDU1 to ASDUn.
The data included in ASDU1 to ASDUn shows the value of the amount of electricity collected in the monitored plant.
Then, the processing unit C14 performs an operation on the value of the electric quantity indicated by the data extracted by the processing unit B13.

As described above, according to the first and second embodiments, processing (decoding processing) for extracting specific data from a received packet is performed by dedicated hardware different from the CPU for logic operation and the CPU for numerical operation. Therefore, the decoding process is made efficient, and packet reception, data extraction and calculation can be performed in a short cycle.
In particular, in a protection relay device compliant with IEC61850-9-2 (process bus standard), SV packet decoding processing is made efficient, and SV packet reception, data extraction, and computation can be performed in a short cycle.

In the first and second embodiments, the plant monitoring control apparatus including the following has been described.
(A) a process bus transmission / reception unit that receives the collected current / voltage values in a communication packet;
(B) a processing unit that performs logical operations such as data determination and communication packet generation;
(C) a processing unit that executes a decoding process on a specific communication packet at a high speed;
(D) a processing unit for performing numerical calculation processing of current / voltage values;
(E) a management unit that performs processing distribution to the processing unit;
(F) a data holding unit for storing communication packets received from the process bus;
(G) A data holding unit that stores the decoding result of the communication packet.

In

Embodiments

1 and 2, the communication packet decoding processing unit including the following has been described.
(A) a processing unit for extracting only attribute data necessary for processing;
(B) a processing unit for programming attributes to be extracted;
(C) A processing unit for performing address alignment matching processing.

Finally, a hardware configuration example of the plant monitoring control apparatus 10 shown in the first and second embodiments will be described.
FIG. 8 is a diagram illustrating an example of hardware resources of the plant monitoring control apparatus 10 illustrated in the first and second embodiments.
The configuration in FIG. 8 is merely an example of the hardware configuration of the plant monitoring control device 10, and the hardware configuration of the plant monitoring control device 10 is not limited to the configuration described in FIG. There may be.

In FIG. 8, the plant monitoring and control apparatus 10 includes a CPU 911 (also referred to as a central processing unit, a central processing unit, a processing unit, a processing unit, a microprocessor, a microcomputer, and a processor) that executes a program.
The CPU 911 is connected to, for example, a ROM (Read Only Memory) 913, a RAM (Random Access Memory) 914, a communication board 915, a display device 901, a keyboard 902, a mouse 903, and a magnetic disk device 920 via a bus 912. Control hardware devices.
The CPU 911 corresponds to, for example, the processing unit A12 and the processing unit C14 illustrated in FIG.

Further, the CPU 911 may be connected to an FDD 904 (Flexible Disk Drive), a compact disk device 905 (CDD), and a printer device 906. Further, instead of the magnetic disk device 920, a storage device such as an SSD (Solid State Drive), an optical disk device, or a memory card (registered trademark) read / write device may be used.
The RAM 914 is an example of a volatile memory. The storage media of the ROM 913, the FDD 904, the CDD 905, and the magnetic disk device 920 are an example of a nonvolatile memory. These are examples of the storage device.
The data holding unit A16 and the data holding unit B17 illustrated in FIG. 1 are realized by the RAM 914, for example.
The process bus transmission / reception unit 11 illustrated in FIG. 1 is realized by the communication board 915, for example.
The communication board 915, the keyboard 902, the mouse 903, etc. are examples of input devices.
The communication board 915, the display device 901, the printer device 906, and the like are examples of output devices.

The communication board 915 is connected to a network (process bus) 18 as shown in FIG.
For example, the communication board 915 may be connected to a LAN (Local Area Network), the Internet, a WAN (Wide Area Network), a SAN (Storage Area Network), or the like.

The dedicated hardware 907 corresponds to the processing unit B13 illustrated in FIG.
The dedicated hardware 907 may be a CPU that executes a program for realizing the decoding process shown in FIG. 5, or may be a combination of logic circuits.
When the dedicated hardware 907 is a CPU, a program for realizing the decoding process shown in FIG. 5 is included in the program group 923 of the magnetic disk device 920, for example.

The magnetic disk device 920 stores an operating system 921 (OS), a window system 922, a program group 923, and a file group 924.
The programs in the program group 923 are executed by the CPU 911 using the operating system 921 and the window system 922.
The program group 923 includes, for example, a program for realizing the processing of the processing unit A12 and the processing unit C14 and a program for realizing the processing of the management unit 15.
Further, as described above, the program group 923 includes a program for realizing the decoding process shown in FIG. 5 when the dedicated hardware 907 is a CPU.

The RAM 914 temporarily stores at least part of the operating system 921 program and application programs to be executed by the CPU 911.
The RAM 914 stores various data necessary for processing by the CPU 911.
The RAM 914 stores the SV packet received from the network (process bus) 18 and the data extracted by the processing unit B13.

The ROM 913 stores a BIOS (Basic Input Output System) program, and the magnetic disk device 920 stores a boot program.
When the plant monitoring control device 10 is started, the BIOS program in the ROM 913 and the boot program for the magnetic disk device 920 are executed, and the operating system 921 is started by the BIOS program and the boot program.

In the file group 924, in the description of the first and second embodiments, “determination of”, “determination of”, “extraction of”, “analysis of”, “comparison of”, “update of” ”,“ Settings ”,“ Registering ”,“ Selecting ”, etc. Information, data, signal values, variable values, and parameters that indicate the results of the processing are“ It is stored as each item of “Database”.
In addition, the arrows in the flowcharts described in the first and second embodiments mainly indicate input / output of data and signals.
In addition to the RAM 914, the data and signal values may be recorded on a recording medium such as a flexible disk of the FDD 904, a compact disk of the CDD 905, a magnetic disk of the magnetic disk device 920, other optical disks, mini disks, and DVDs.
Data and signals are transmitted online via a bus 912, signal lines, cables, or other transmission media.

Further, the process of the plant monitoring control apparatus 10 can be regarded as a data processing method by the steps, procedures, and processes described in the first and second embodiments.

10 plant monitoring control device, 11 process bus transmission / reception unit, 12 processing unit A, 13 processing unit B, 14 processing unit C, 15 management unit, 16 data holding unit, 17 data holding unit, 18 network (process bus), 19 data Collection device.

Claims

A communication device that receives a packet including a plurality of data,
A communication apparatus, comprising: dedicated hardware for data extraction processing for extracting data that matches a specific condition from the plurality of data of the received packet.
The communication device
Receive a hierarchical packet containing multiple data associated with a data identifier,
The dedicated hardware is
2. The data extraction process includes analyzing a hierarchical structure of a received packet and extracting data associated with a specific data identifier from the plurality of data of the received packet. The communication apparatus as described in.
The dedicated hardware is
The communication apparatus according to claim 1, wherein dummy data is added to the extracted data in the data extraction process.
The communication device
In the plurality of data, a packet including data for notifying the measured amount of electricity is received,
The dedicated hardware is
In the data extraction process, the data for notifying the amount of electricity is extracted from the plurality of data of the received packet,
The communication device further includes:
The communication apparatus according to claim 1, further comprising hardware that performs an operation on an electric quantity notified by data extracted by the dedicated hardware, in addition to the dedicated hardware.
The communication device
As a packet including data for notifying the measured amount of electricity, a packet conforming to the International Electrotechnical Commission (IEC) 61850-9-2 standard is received,
The dedicated hardware is
5. The communication apparatus according to claim 4, wherein, in the data extraction process, data included in an ASDU (Application Service Data Unit) is extracted as data for notifying the amount of electricity.