CN102064614B - Method for fault inversion and communication inversion of digital substation based on IEC (International Electrotechnical Commission) 61850 standard - Google Patents

Abstract

The invention discloses a method for fault inversion and communication inversion of a digital substation based on the IEC (International Electrotechnical Commission) 61850 standard. At present, the digital substation based on the IEC61850 standard is basically internally provided with network data recording devices only taking charge of intercepting and storing original communication messages and not having the function of communication inversion. In the invention, the method for fault inversion and communication inversion of the digital substation based on the IEC61850 standard comprises the following steps of: analyzing Comtrade recording files generated by a digital fault recorder, and repeatedly transmitting the acquired data on each recording time point according to the recorded frequencies so as to realize the inversion of the fault data; and analyzing recorded files generated by the recording devices in the substation, and reducing and transmitting the files according to the recording time corresponding sequence of each data in the recorded files so as to realize the inversion of the communication process. The invention realizes the fault inversion and the communication inversion by a simple manner, and the combination of the fault inversion and the communication inversion provides an excellent auxiliary effect for substation workers to find out the reason of faults.

Description

Fault inversion and communication inversion method of digital substation based on IEC61850 standard

technical field

The present invention relates to the application of the general object-oriented substation event (GOOSE) of IEC61850 in the international standard "Substation Communication Network and System" and the sampling measurement value (SMV) transmitted through ISO/IEC802.3 in substation relay protection, specifically It is a digital substation fault inversion and communication inversion method based on the IEC61850 standard.

Background technique

The IEC61850 standard is the latest series of standards of "Substation Communication Network and System" formulated by the International Electrotechnical Commission TC57 working group to solve the interoperability problems faced by the substation automation system. This standard is supported by most mainstream manufacturers at home and abroad, and has become the only unified standard in the field of substation automation in the world.

The tripping and closing information in the digital substation based on the IEC61850 standard is transmitted through the general object-oriented substation event GOOSE message, and the current and voltage sampling measurement data is converted by the primary equipment through optical CT/PT, and passed through the substation The merging unit generates sampled measurement value SMV data. GOOSE events and SMV data co-exist in the process layer of the digital substation. When a fault occurs in a digital substation, the sampling measurement value SMV of the process layer merging unit will undergo a transient change. After receiving the SMV data, the protection equipment and the intelligent operation box in the station will judge whether a fault event occurs according to their own internal action logic. When a trip occurs, if a trip event occurs, a general object-oriented substation event GOOSE message will be sent at the process level. The GOOSE information and SMV data generated when these faults occur are all intercepted, stored and generated by the digital fault recorder at the process level to generate Comtrade wave recording files that comply with the IEEE Std C37.111-1999 standard. . Protection devices often operate in substations, and the protection devices are connected to each other through network communication. Therefore, many faults will cause a series of chain reactions of protection devices. These complex power grid accidents have a considerable impact on the technical analysis work of power engineers. difficulty. When engineers and technicians analyze complex accident trips, there is an urgent need for a specific debugging tool and method to re-read and analyze Comtrade wave recording files, and use high-precision time-controlled communication ports to measure SMV when the power grid is abnormal. The data and GOOSE tripping information are played back, so as to realize the qualitative analysis of power grid faults and the quantitative analysis of transient data.

Digital substations based on the IEC61850 standard are basically equipped with network data recording equipment. These network data recording devices record communication data in chronological order, and there is no limit to the type of recorded data, and store and generate record files in a fixed format. These network data recording devices are only responsible for the interception and storage of original communication messages, and do not have the function of communication inversion. When the network function of the digital substation automation system is abnormal, the power engineer urgently needs a specific debugging tool and method to re-read and analyze the network message record file while analyzing the on-site network status, and use high-precision The time-controlled communication port plays back all communication messages when the network is abnormal according to the original recording time scale, thus providing a basis for the location analysis and judgment of network fault points.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art, and provide a digital substation fault inversion and communication inversion method based on the IEC61850 standard to effectively solve the data value and data communication process when the digital substation fails recovery problem.

For this reason, the technical scheme that the present invention adopts is as follows.

1. Fault inversion of digital substation based on IEC61850 standard.

In order to reproduce the data information when the digital substation is faulty, the present invention proposes a fault inversion method: by analyzing the Comtrade file generated by the digital fault recorder, according to the frequency of the recorder (if 4000 points/second collection frequency, then the oscilloscope records data every 250us), and resends the data collected at each recording time point, so as to achieve the effect of inverting the fault data.

The SMV data recorded by the digital fault recorder are all obtained from multiple merging units in the station, while the GOOSE data are obtained from multiple protection devices and intelligent operation boxes. Therefore, before analyzing the Comtrade file of the wave recorder, the data in the Comtrade file must correspond to the device that generated the data, so that the fault can be correctly and effectively reversed. The information parameters of the device can be obtained by importing the IED specific configuration (configured IED description, CID) file.

2. Communication inversion of digital substation based on IEC61850 standard.

The record file contains two parts, one part is the data message header, and the other part is the actual data message recorded. By analyzing the header of the data packet, the time stamp of the packet captured by the recording device, the actual packet length, and the recorded channel number can be obtained. Through the analysis of the packet header, the actual recorded packet can be determined later. At what point in time, from which sending port to send. In order to reproduce the communication process of the digital substation, the present invention proposes a communication inversion method: through the analysis of the recording files generated by the recording equipment in the station, according to the relative order of recording time of each piece of data in the recording files, restore and send, then The inversion of the communication process can be realized.

The high-precision synchronous transmission method of the network message is: receive the external B-code clock through the synchronous transmission module, perform hard decoding on the B-code to obtain the absolute time and generate a second pulse signal, and use the decoded absolute time to synchronize the clock of the synchronous transmission module. Use the second pulse generated by decoding and the frequency of its own crystal oscillator to synchronize the frequency of the synchronous sending module in real time. After the simulation sending is started, the synchronous sending module alternately reads the data in the two buffers, and sends the message according to the sending time marked for each frame message and the frequency count after synchronization. The physical interface of the synchronous transmission module supports multiple electrical ports or optical ports. The hardware PHY and Altera's Ethernet controller IP (intellectual property core) realize the multi-channel network one-way transmission, and lock the work on the Ethernet controller IP core. The way is to send only, thus ensuring that the entire module will not be interfered by the physical network sent.

FPGA is a kind of highly integrated programmable logic device. It is a field programmable logic gate array. FPGA combines microelectronics technology, circuit technology, and EDA technology. It is a semi-customized integrated circuit (ASIC) field. The appearance of the circuit not only solves the shortage of customized circuits, but also overcomes the shortcomings of the limited number of gate circuits of the original programmable device. The use of FPGA is very flexible, and the same FPGA can generate different circuit functions through different programming data. FPGA has been widely used in many fields such as communication, data processing, network, instrument, industrial control, military and aerospace. IP core (IP Core) is a hardware description language program with specific circuit functions, which can be easily modified and customized to improve design efficiency. Users can synthesize the correct gate-level netlist and carry out subsequent structural design. According to various semiconductor processes, devices with different performances are designed.

The present invention realizes fault inversion and communication inversion in a simple way, wherein fault inversion effectively solves the problem of restoring data values when a digital substation fails, and communication inversion effectively solves the problem of data value restoration when a digital substation fails. The restoration of the data communication process, the combination of the two plays a very good auxiliary effect in helping the substation staff to find out the cause of the fault.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a flow chart of digital substation fault inversion according to the present invention.

Fig. 2 is a flow chart of digital substation communication inversion according to the present invention.

Detailed ways

The specific steps of digital substation fault inversion are as follows.

1) On the specified sending port, import the CID files of one or more merging units.

2) On the designated sending port, import the CID files of one or more protection devices or intelligent operation boxes.

3) Import the Comtrade cfg file generated by the digital fault recorder.

4) Match the SMV and GOOSE data in the CID file with the SMV and GOOSE data in the Comtrade file.

5) Take out the data from Comtrade's dat file, and fill in the SMV and GOOSE messages according to the mapping relationship.

6) Time stamp each frame of message according to Comtrade's recording frequency, and organize the data of one second.

7) Drive the FPGA and send it synchronously according to the calibrated time scale.

The specific steps of digital substation communication inversion are as follows.

1) Import the record file.

2) Analyze the data format of the record file;.

3) According to the relative time of each data record, time stamp the data to be sent in each frame, prepare the data for 1 second, and store it in the sending buffer of the port.

Drive the FPGA to send synchronously according to the relative sequence of data recording time.

Claims (2)

1. based on the inverting of digital transformer substation fault and the inversion method of communicating by letter of IEC61850 standard; It is characterized in that described fault inversion method is following: the Comtrade record ripple file through the digitlization fault oscillograph is generated is analyzed; According to its record wave frequency; The data that each writing time, point was upward gathered are sent out again, thus the inverting of realization fault data;

The concrete steps of said fault inversion method are following:

1) on the transmit port of appointment, imports the CID file of one or more merge cellses;

2) on the transmit port of appointment, import the CID file of one or more protection equipment or intelligent operation box;

3) the cfg file of the Comtrade of importing digital fault oscillograph generation;

4) SMV and GOOSE data in the SMV in the CID file and GOOSE data and the Comtrade file are mated;

5) from the dat file of Comtrade, take out data, and, insert in SMV and the GOOSE message according to mapping relations;

6) recording frequency according to Comtrade is that every frame message is beaten markers, and organizes the data of one second kind;

7) drive FPGA, carry out synchronized transmission, promptly carry out the fault inverting according to the markers of demarcating;

Described communication inversion method is following: through the analysis of log file that recording equipment in standing is produced, according to the relative order writing time of every data in the log file, reduce transmissions, thereby realization is to the inverting of communication process;

The concrete steps of said communication inversion method are following:

1) imports log file;

2) data format of analytic record file;

3) according to the relative time of every data record, stamp markers, prepare the data in 1 second, and deposit in the transmission buffering of port for the data that every frame is ready for sending;

4) drive FPGA, carry out synchronized transmission, promptly communicate inverting according to the relative order of data record time.

2. the inverting of digital transformer substation fault and the inversion method of communicating by letter based on the IEC61850 standard according to claim 1; The concrete steps that it is characterized in that said synchronized transmission are following: receive outside B sign indicating number clock through the synchronized transmission submodule; The B sign indicating number is carried out hard decoder obtain absolute time and produce pps pulse per second signal, utilize decoded absolute time that the synchronized transmission submodule is carried out clock synchronization; Utilize the pps pulse per second signal of decoding generation and the frequency of self crystal oscillator, in real time the synchronized transmission submodule is carried out Frequency Synchronization.

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