CN111402568A - Data communication method for phasor data concentrator - Google Patents
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Abstract
The invention discloses a DATA communication method for a phasor DATA concentrator, which belongs to the technical field of intelligent substation automation equipment and comprises the steps of establishing a DATA thread, a COMMAND thread and an FI L E thread, establishing a TCP server and a TCP Client on each thread, wherein the COMMAND thread is used for issuing COMMANDs, receiving COMMANDs and processing COMMANDs, receiving real-time DATA uploaded by a synchronous phasor measurement device in the DATA thread by the phasor DATA concentrator, collecting and storing the real-time DATA and sending the collected real-time DATA to a master station, and receiving an offline file uploaded by the synchronous phasor device by the phasor DATA concentrator in the FI L E thread, storing the offline file and sending the stored offline file DATA to the master station.
Description
Technical Field
The invention relates to the technical field of intelligent substation automation equipment, in particular to a data communication method for a phasor data concentrator.
Background
With the development of automatic construction of intelligent substations, Phasor Data Concentrators (PDCs) must be configured for synchronous Phasor Measurement Units (PMUs) in the same substation, so as to complete the functions of receiving, collecting, storing and transmitting synchronous phasor data acquired by all the PMUs to a master station.
The phasor data concentrator receives phasor data uploaded by not less than 20 PMU devices in real time in an Ethernet mode, aligns the data according to a synchronous clock, aligns the section data of all received phasor measurement signals, and converges and uploads the phasor measurement signals of the aligned data to a system master station according to a configuration file and an extended communication protocol. The uploading rate is 1/5/10/25/50/100/200 frames/second adjustable, and the real-time data needs to be stored for no less than 14 days. And while transmitting real-time data, it is also possible to transmit offline file data (rate 100 frames/S).
Because of the huge amount of data and long processing time, the existing PDC has the following risks when implementing the above functions:
(1) the time for processing the data of the off-line file is too long, which affects the real-time data transmission and can not ensure the stability of the real-time data transmission rate.
(2) The off-line file processing time is too long, so that a real-time data transmission pipeline is interrupted, and data is lost.
(3) The PDC can not read the real-time data in the buffer in time, so that extra unpacking is needed when the data in the receiving buffer area is pasted with the packet, the workload is increased, the collection of the real-time data of the PDC is seriously influenced in the past, and the real-time property of the transmitted data cannot be guaranteed.
(4) The time spent by the master station for calling the offline file data of the single PMU through the PDC is too long, the efficiency of the PDC device is low, the offline data pipeline can be interrupted seriously, and the offline data pipeline cannot be returned to the master station correctly.
(5) The amount of files is huge, and if the device memory is small, the PDC memory space is insufficient for storing the files for 14 days.
Assuming that 8 phasors, 10 analog quantities and 4 switching values are 1 information element, taking 3 information elements as an example, calculating the storage occupation of a single PDC accessed to 20 PMUs as shown in the following table 1:
TABLE 1
In summary, due to the reasons of large data volume, long processing time, long running time and the like, the existing phasor data concentrator has serious problems of loss of real-time data, low real-time data instantaneity, incapability of guaranteeing the real-time data uploading rate, insufficient memory and the like in the processing process of received phasor data.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and realize accurate, quick and safe receiving and transmitting of phasor data.
To achieve the above object, the present invention employs a data communication method for a phasor data concentrator, including:
in the program running stage, creating a DATA thread, a COMMAND thread and a FI L E thread, and establishing a TCP server and a TCP Client on each thread for respectively receiving, processing and transmitting real-time DATA, offline file DATA and COMMANDs of a master station or a PMU;
in the COMMAND thread, issuing a configuration file to a PMU, correctly returning to issue a COMMAND for opening real-time data in the PMU, and starting real-time data transmission between the PMU and the PDC;
in a DATA thread, the PDC receives a real-time DATA message uploaded by the PMU, collects and stores the real-time DATA, and sends the collected real-time DATA to the master station;
in the COMMAND thread, a timer is established, an offline data transmission COMMAND is sent to the PMU at regular time, offline file pipeline connection is established in the FI L E thread, and an offline file data message uploaded by the PMU is intercepted;
in an FI L E thread, when the PDC receives an offline file data packet uploaded by the PMU, the offline file data is stored in a local directory of a type according to a difference in types of the uploaded offline file data, so that the offline file data stored by the PDC is transmitted to the primary station according to a call of the primary station.
Further, in the DATA thread, the PDC receives the real-time DATA packet uploaded by the PMU, and collects and stores the real-time DATA, including:
the PDC judges whether the received real-time data message has continuous frames or broken frames;
if so, processing the real-time data of the continuous frames or the broken frames, and collecting the data of the same time scale of the plurality of PMUs according to the time scale of the processed data;
if not, the real-time data is collected and stored for the data of the plurality of PMUs at the same time scale directly according to the time scale.
Further, in the DATA thread, the PDC stores the collected real-time DATA, including:
the PDC stores the data in each minute in the same folder, and after the data in one minute are completely stored, the folder is compressed and stored in a dynamic data file directory;
and judging whether the earliest files in the real-time data file directory exceed the set 14 days or not, and deleting the files exceeding the time threshold.
Further, still include:
and checking whether the data volume under the corresponding offline file data type directory in the local area exceeds 1000, and deleting the file with the earliest identification time if the data volume under the corresponding offline file data type directory in the local area exceeds 1000.
Further, still include:
in the COMMAND thread, the PDC receives a COMMAND of calling an offline file issued by the master station;
the PDC analyzes the received calling off-line file command to obtain an analysis result of the calling off-line file command, wherein the analysis result comprises a file type, a PMU ID and a time range;
if the analysis result is that the continuous wave recording file is called, the PDC sends a command of calling the continuous wave recording file to the corresponding PMU according to the PMU ID;
in the FI L E thread, the PDC receives the continuous wave recording file uploaded by the corresponding PMU by using the file pipeline, and forwards the continuous wave recording file to the master station.
Further, if the analysis result is a calling event identification file or a transient file, the COMMAND thread searches a conforming file in the file directory of the corresponding type according to the PMU ID and the time range requested by the master station and transmits the name of the file to the FI L E thread under the directory of the corresponding type corresponding to the file type;
the FI L E thread finds the corresponding file according to the name of the file, reads and frames the file content, and sends the file content to the master station.
Further, if the analysis result is that dynamic record data is transmitted, the COMMAND thread searches a conforming file under the file directory of the corresponding type according to the time range requested by the master station and transmits the name of the file into the FI L E thread;
the FI L E thread finds a corresponding file according to the name of the file and decompresses the file;
and the FI L E thread reads and frames the decompressed file content and sends the decompressed file content to the master station, and then the decompressed file is compressed again and stored.
Compared with the prior art, the invention has the following technical effects: the invention adopts multi-thread multi-channel to reasonably process and schedule various different types of data in the transmission process between the PMU and the master station, can simultaneously complete the receiving and sending of messages such as real-time data, off-line file data and the like, realizes high-concurrency data communication, improves the capability of the PDC for processing the high-concurrency data communication, and ensures the accurate, rapid, safe and stable operation of the PDC.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a flow chart of a method of data communication for a phasor data concentrator;
FIG. 2 is a schematic diagram of a phasor data concentrator receiving, transmitting and storing real-time data;
FIG. 3 is a schematic diagram of a phasor data concentrator timed call and storage of a synchrophasor measurement device offline event file;
fig. 4 is a schematic diagram of a master station summoning a phasor data concentrator offline file.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, the present embodiment discloses a data communication method for a phasor data concentrator, including the following steps S1 to S4:
s1, in the program running stage, creating a DATA thread, a COMMAND thread and a FI L E thread, and establishing a TCP server and a TCP Client on each thread for respectively receiving, processing and transmitting real-time DATA, offline file DATA and COMMANDs of a master station or PMU;
s2, in the COMMAND thread, issuing a configuration file to the PMU, and correctly returning a COMMAND for issuing and opening real-time data in the PMU to start the real-time data transmission between the PMU and the PDC;
s3, in the DATA thread, the PDC receives the real-time DATA message uploaded by the PMU, collects and stores the real-time DATA, and sends the collected real-time DATA to the master station;
s4, in the COMMAND thread, a timer is established, an offline data transmission COMMAND is sent to the PMU at regular time, offline file pipeline connection is established in the FI L E thread, and an offline file data message uploaded by the PMU is intercepted;
and S5, in the FI L E thread, when the PDC receives the offline file data message uploaded by the PMU, storing the offline file data in a local directory of the type according to different types of the uploaded offline file data, so as to send the offline file data stored by the PDC to the master station according to the calling of the master station.
In the embodiment, 3 threads are created in the program running stage, and different data types are processed by adopting a multi-thread multi-channel, so that the receiving and sending of messages such as real-time data, offline file data and the like can be completed simultaneously, and high-concurrency data communication is realized.
Specifically, as shown in fig. 2, the COMMAND thread in this embodiment is used to send a configuration file COMMAND to the PMU, so as to issue a COMMAND to open real-time data transmission after the PMU correctly parses the COMMAND, and start transmission of real-time data between the PMU and the PDC. The DATA thread is used for receiving, sending and storing the phasor DATA when the phasor DATA concentrator receives the phasor DATA of a plurality of synchronous phasor measurement devices, and comprises the following steps:
a1, in the DATA thread, the PDC receives real-time DATA uploaded by the PMU.
a2, judging whether the received real-time data message has the condition of frame connection or frame disconnection, if so, executing a step a3, otherwise, executing a step a 4;
and a3, correctly processing continuous frames or broken frames to obtain processed real-time data.
a4, collecting the processed data according to the time scale and the same time scale data of a plurality of PMUs;
a5, collecting the data of the same time scale of the synchronous phasor measurement devices according to the time scale directly from the real-time data;
a6, transmitting the collected real-time data to the master station.
Preferably, in the DATA thread, the PDC further stores the collected real-time DATA, and the specific process is as follows:
a7, in the catalog for storing the real-time data files, PDC stores the real-time data collected in each minute into the same file, compares the minute time of the frame data, checks whether there is a stored file, if yes, executes a8, otherwise executes a 10;
a8, writing the frame data into the existing stored files, judging whether the data in one minute are completely stored, if yes, compressing the files after the files are stored, and then executing a 9;
a9, judging whether the earliest file in the directory has exceeded 14 days, if yes, deleting the earliest file.
a10, if there is no file for storing the frame data, a new file is created, named after the frame minute, and the collected data is written into the file.
In addition, in the present embodiment, the real-time data file is stored in a compressed manner, the storage space of the device can be saved by compressed storage, and the compressed file is decompressed before the real-time data file is transmitted, and the file is compressed again for storage after the transmission is completed.
Specifically, as shown in fig. 3, the COMMAND thread of this embodiment is used for sending an event identification file COMMAND and a transient data file COMMAND to the PMU, so as to issue a COMMAND for opening offline file transmission after the PMU correctly parses the COMMAND, and start the offline file transmission between the PMU and the PDC.
In the COMMAND thread, the PDC regularly calls a PMU transient event identifier file and a transient data file, and caches the data of all PMUs locally at the PDC so that a master station can respond in time when calling, and the device performance is improved, specifically comprising the following steps b1-b 1:
b1, creating a timer in the COMMAND thread, regularly sending COMMANDs such as uploading transient event identification files and transient data files to the PMU by the PDC, establishing an offline file pipeline connection in the FI L E thread, and monitoring offline file data messages uploaded by the PMU;
b2, in the FI L E thread, when the PDC receives the transient event identification file or the transient data file uploaded by the PMU, naming the files according to the specified format (including time and PMU ID information) according to different uploaded data types and storing the files in the local file directory of the corresponding type.
b3, checking whether the data volume under the file directory of the corresponding type exceeds 1000, if so, executing a step b4, otherwise, executing a step b 5;
b4, deleting the file with the earliest identification time;
b5, the file is not deleted.
It should be noted that, in this embodiment, the PDC calls the PMU transient event identifier file, the transient data file, and the like at regular time, and the transient event identifier file, the transient data file, and the like are preferentially cached locally, so that the host station can directly send a locally cached file when calling the PMU offline file, and the PDC is faster and more efficient.
Specifically, as shown in fig. 4, the master station sends an offline file of the calling PDC to implement transparent transmission, high-concurrency data communication and large file transmission, including the following steps c1 to c 9:
c1, in the COMMAND thread, the PDC receives the COMMAND of calling the off-line file issued by the master station, analyzes the COMMAND of calling the off-line file to obtain an analysis result, if the analysis result is calling the continuous recording file, the steps c 2-c 3 are executed, if the analysis result is calling the event identification file or the transient file, the steps c 4-c 5 are executed, and if the analysis result is transmitting the dynamic recording data file, the steps c 6-c 9 are executed;
and c2, the PDC directly forwards the command to the PMU with the corresponding ID according to the PMU ID, establishes an offline file pipeline connection in the FI L E thread, and monitors the continuous wave recording file uploaded by the PMU.
And c3, the PDC receives the continuous wave recording file uploaded by the PMU through a file pipeline in the FI L E thread, and directly forwards the data to the master station.
c4, the PDC finds a conforming file according to the type of the data and the PMU ID and the time range requested by the master station, and transmits the file name to the FI L E thread;
c5, transmitting the qualified file name into an FI L E thread, and finishing the work of reading the file content, framing, sending to the main station and the like by the FI L E thread.
c6, the PDC finds a conforming file according to the time range requested by the master station, and transmits the file name into the FI L E thread;
c7, in the FI L E thread, firstly finding the file according to the incoming file name, and decompressing the compressed file;
c8, reading the decompressed file content, completing framing and sending to the master station.
And c9, after the transmission is finished, the decompressed file is compressed again and then is stored.
It should be noted that the technical scheme of the present invention can improve the capability of the PDC in processing high concurrent data communication, improve the performance of the device, save the storage space of the device, and ensure the accurate, fast, safe and stable operation of the PDC.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method of data communication for a phasor data concentrator, comprising:
in the program running stage, creating a DATA thread, a COMMAND thread and a FI L E thread, and establishing a TCP server and a TCP Client on each thread for respectively receiving, processing and transmitting real-time DATA, offline file DATA and COMMANDs of a master station or a PMU;
in the COMMAND thread, issuing a configuration file to a PMU, correctly returning to issue a COMMAND for opening real-time data in the PMU, and starting real-time data transmission between the PMU and the PDC;
in a DATA thread, the PDC receives a real-time DATA message uploaded by the PMU, collects and stores the real-time DATA, and sends the collected real-time DATA to the master station;
in the COMMAND thread, a timer is established, an offline data transmission COMMAND is sent to the PMU at regular time, offline file pipeline connection is established in the FI L E thread, and an offline file data message uploaded by the PMU is intercepted;
in an FI L E thread, when the PDC receives an offline file data message uploaded by the PMU, the offline file data is stored in a local directory of a corresponding type according to different types of the uploaded offline file data, so that the offline file data stored by the PDC is transmitted to the master station according to the calling of the master station.
2. The DATA communication method for the phasor DATA concentrator according to claim 1, wherein in the DATA thread, the PDC receives the real-time DATA packet uploaded by the PMU, and collects and stores the real-time DATA, and the method comprises:
the PDC judges whether the received real-time data message has continuous frames or broken frames;
if so, processing the real-time data of the continuous frames or the broken frames, and collecting the data of the same time scale of the plurality of PMUs according to the time scale of the processed data;
if not, the real-time data is collected and stored for the data of the plurality of PMUs at the same time scale directly according to the time scale.
3. The DATA communication method for a phasor DATA concentrator according to claim 1, wherein said PDC storing aggregated real-time DATA in a DATA thread, comprising:
the PDC stores the data in each minute in the same folder, and after the data in one minute are completely stored, the folder is compressed and stored in a dynamic data file directory;
and judging whether the earliest file in the real-time data file directory exceeds 14 days or not, and deleting the files exceeding the time threshold.
4. The data communication method for a phasor data concentrator according to claim 1, further comprising:
and checking whether the data volume under the corresponding offline file data type directory in the local area exceeds 1000, and deleting the file with the earliest identification time if the data volume under the corresponding offline file data type directory in the local area exceeds 1000.
5. The data communication method for a phasor data concentrator according to claim 1, further comprising:
in the COMMAND thread, the PDC receives a COMMAND of calling an offline file issued by the master station;
the PDC analyzes the received calling off-line file command to obtain an analysis result of the calling off-line file command, wherein the analysis result comprises a file type, a PMU ID and a time range;
if the analysis result is that the continuous wave recording file is called, the PDC forwards a command for calling the continuous wave recording file to the corresponding PMU according to the PMU ID;
in the FI L E thread, the PDC receives the continuous wave recording file uploaded by the corresponding PMU by using the file pipeline, and forwards the continuous wave recording file to the master station.
6. The data communication method for the phasor data concentrator according to claim 5, wherein if the parsed result is a call event identification file or a transient file, under a corresponding type directory corresponding to a file type, the COMMAND thread searches for a conforming file under the corresponding type of file directory according to the PMU ID and the time range requested by the master station, and transmits the name of the file into the FI L E thread;
the FI L E thread finds the corresponding file according to the name of the file, reads and frames the file content, and sends the file content to the master station.
7. The data communication method for phasor data concentrator of claim 5, wherein if the result of the parsing is to transmit dynamic recording data, said COMMAND thread looks up a conforming file under said corresponding type of file directory according to the time range requested by said master station and transmits the name of the file into said FI L E thread;
the FI L E thread finds a corresponding file according to the name of the file and decompresses the file;
and the FI L E thread reads and frames the decompressed file content and sends the decompressed file content to the master station, and then the decompressed file is compressed again and stored.
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