CN112052243A - Continuous waveform recording method based on database technology - Google Patents
Continuous waveform recording method based on database technology Download PDFInfo
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Abstract
The invention discloses a continuous waveform recording method based on database technology, which comprises the steps of initializing an annular shared memory area and an in-process cache area, collecting waveform data and writing the waveform data into the in-process cache area; based on time marks, aligning the waveform data, and writing the aligned cache data into the annular shared memory area to complete the receiving of the cache data; and storing the cache data through a structured query statement to complete the recording of continuous waveforms. The invention adopts the time sequence database as the storage mode of the continuous waveform data and uses the specific sub-table and SQL parallel format technology to realize the writing-in of mass recording data, thereby effectively improving the exchange speed of the waveform data.
Description
Technical Field
The invention relates to the technical field of power failure analysis, in particular to a continuous waveform recording method based on a database technology.
Background
The power failure recording device is an important component device for power system failure analysis, and is responsible for performing failure analysis in time after a power system fails, searching for a power failure cause, and locating a failure point. Along with the popularization and use of the traveling wave fault location device in the power transmission network of 220kV and above, the reliability and accuracy of the location of the device are more and more concerned. Due to the fact that a fault traveling wave source is complex, the traveling wave acquisition principle and the installation mode are diversified, the traveling wave fault distance measuring device which is installed on site and operated is difficult to carry out comprehensive and systematic test at present, high-efficiency operation of the traveling wave high-frequency transient wave recording device is severely limited, the traveling wave high-frequency transient wave recording device is low in operation reliability, and improvement of distance measuring quality is greatly restricted. So far, the test and evaluation of the traveling wave fault device mainly focus on the test based on off-line digital simulation and simple start test, and the test method and means of the device are not unified in China.
Waveform data is generated at a rate of about 400 channels 10000 points per second, and such massive amounts of information, for example, formatted and written in a serial manner, may prevent the system from completing data writing in a limited time, and the continuously recorded feature is that data is generated at a constant rate, and if the data cannot be written in time, the system may be crashed due to the fact that the data is accumulated more and more.
The traditional high-speed transient waveform recording function based on threshold starting needs to acquire the sudden change and out-of-limit threshold at the fault moment in advance, load the threshold into equipment in a parameter form, and compare and record the threshold as the triggering condition for recording. Because the electric power signal characteristics that regional needs monitoring such as electricity distribution room, power plant are comparatively complicated, changeable, can't acquire accurate characteristic threshold value, if the threshold value that sets up is too little can make the transient state start too frequently, if the too big unable start-up of transient state that can make of threshold value that sets up and can't catch the fault waveform.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a continuous waveform recording method based on a database technology, which can realize the rapid storage and writing of mass recording data by adopting a time sequence database and an SQL parallel format technology and solve the problems of large occupied data storage space and slow retrieval speed.
In order to solve the technical problems, the invention provides the following technical scheme: initializing a ring-shaped shared memory area and an in-process cache area, collecting waveform data and writing the waveform data into the in-process cache area; based on time marks, aligning the waveform data, and writing the aligned cache data into the annular shared memory area to complete the receiving of the cache data; and storing the cache data through a structured query statement to complete the recording of continuous waveforms.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the annular shared memory area comprises a step of applying a piece of continuous memory space with a fixed size to the shared memory area when a data receiving process is started, and organizing the continuous memory space into an annular shape through a private data structure.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the in-process cache region comprises a region where data is cached in a site or a process of a service.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: after the data are aligned and cached, effective values, harmonic waves, sequence components and unbalance degrees of the electric power data are calculated based on the data collected in real time; and analyzing the data of the out-of-limit event and judging the fault type.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the fault types include line ground fault, line short circuit fault, transformer internal fault, transformer external fault, generator fault and magnetizing inrush current.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the storing comprises writing the cached data into a time sequence database by adopting parallel structured query statement formatting and parallel multithreading.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the time series database includes a specialized database for storing and managing time series data including metrics, tags, domains, metric values, timestamps, data points, time series, time precision, data sets, and aggregations.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the time series data comprises time change, the change degree of the time series data is reflected through numerical values, and the calibers of all the data are consistent.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the formatting of the parallel structured query statement comprises formatting floating point type data read from the annular shared memory area into a structured query statement.
As a preferable aspect of the continuous waveform recording method based on the database technology according to the present invention, wherein: the parallel multithreading comprises the steps of establishing connection with a time sequence database and transmitting SQL sentences after the threads are formatted to the time sequence database through a connection channel.
The invention has the beneficial effects that: the invention adopts the time sequence database as a storage mode of continuous waveform data, and uses a specific sub-table and SQL parallel format technology to realize the writing-in of mass recording data, thereby effectively improving the data exchange speed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic flowchart of a continuous waveform recording method based on database technology according to a first embodiment of the present invention;
fig. 2 is a schematic data receiving flow chart of a continuous waveform recording method based on database technology according to a first embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a storage processing flow of a continuous waveform recording method based on a database technology according to a first embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 3, a first embodiment of the present invention provides a continuous waveform recording method based on a database technology, including:
s1: initializing a ring-shaped shared memory area and an in-process cache area, collecting waveform data and writing the waveform data into the in-process cache area.
In order to realize the stability of the system operation, the data receiving and the storage processing are completed in different processes, and the two processes are connected in series to form a ring-shaped shared memory area to complete data interaction. The ring-shared memory area typically has a read pointer pointing to data readable in the ring-shared memory area and a write pointer pointing to a writable buffer in the ring-shared memory area. An in-process cache is an area where data is cached within a site or process of a service.
And writing the acquired waveform data into an in-process buffer area through a programming language.
S2: and based on the time mark alignment waveform data, writing the aligned cache data into the annular shared memory area to complete the receiving of the cache data.
As shown in fig. 2, waveform data in the buffer area in the process is aligned by sampling a time mark, and the aligned buffer data is written into the ring-shaped shared area, and the waveform data is analyzed and calculated in real time while the waveform data is written.
Specifically, when a data receiving process is started, a piece of continuous memory space with a fixed size is applied to a shared memory area, then a private data structure is adopted, the continuous memory space obtained by application is organized into a ring shape, and reading and writing of waveform data are completed by moving a read pointer and a write pointer;
real-time waveform based calculation: according to the data collected in real time, the effective value, the harmonic wave, the sequence component and the unbalance of the power data are quickly calculated, for example, if the effective value is the effective value, the data of one cycle needs to be accumulated, and the effective value is calculated based on DFT (Discrete Fourier Transform) or FFT (Fast Fourier Transform). The indexes can be used for quickly judging whether corresponding starting events occur, such as effective value out-of-limit and harmonic out-of-limit, and original data can be marked based on the indexes;
real-time waveform based analysis: for the data marked with the out-of-limit event, a further analysis process can be performed to further judge the fault type, such as line ground fault, line short-circuit fault, transformer internal fault, transformer external fault, generator fault, magnetizing inrush current and the like.
Preferably, the use of the ring-shaped shared memory area reduces the problems of efficiency loss and memory fragmentation caused by the conventional frequent application and memory space release, effectively improves the exchange speed of the waveform data, adopts a ring-shaped structure, ensures that the data receiving and storing processing only needs to continuously write or read the waveform data in a clockwise or anticlockwise mode, and reduces the complexity of shared space access.
S3: and storing the cache data through a structured query statement to complete the recording of the continuous waveform.
As shown in fig. 3, the cached data is written into the sequential database using SQL (Structured Query Language) formatting and parallel multithreading, respectively.
Specifically, 400 waveform data channels are divided into 8 processing combinations, each processing combination stores a data start value and an offset value which need to be processed, each processing combination comprises two threads, one of the two threads is a formatting thread and is responsible for completing conversion from floating point type data to an SQL character string, the other one of the two threads is a writing thread and is responsible for communicating with a time sequence database through a User Datagram Protocol (UDP) and sending an SQL character string statement after formatting is completed to the time sequence database, and the time sequence database finally completes storage of waveform data. All the processing groups run synchronously and parallelly, and the powerful parallel computing capability of the multi-core processor is fully exerted.
It should be noted that CAST function is adopted to convert floating point type data; UDP is a connectionless transport layer protocol in the OSI (Open System Interconnection) reference model, and is a connectionless protocol that provides transaction-oriented simple unreliable information transfer service, and IETF RFC 768 is a formal specification of UDP.
A time-series database is a database for processing time-tagged (time-series, time-sequential) data, which includes metrics (indicators of monitoring data), tags (indicators monitor a specific object for which the target belongs to a data subcategory under a specified metric, a tag is composed of a tag key and a corresponding tag value), fields (subcategories of data under a specified metric, which generally store data that will change with the change of a time stamp), metric values (values corresponding to the metric), time stamps (time points at which metric values are generated), data (each metric value collected at a specific time interval for a certain indicator of the monitoring object), time series, time precision (writing time precision of time line data — millisecond, second, minute, hour or other stable time frequency), data groups (composed of tags), and aggregation, a cache and rolling strategy is set in the time sequence database, and the database maintains the space and time of writing data.
The time series data are data columns recorded by the same index according to time sequence, and each data in the same data column has the same caliber; the method is mainly characterized by fast generation frequency (10000 pieces of data can be generated in one second of each path of monitoring signal), serious dependence on acquisition time (the time of each path of data is unique and is accurate to 100 microseconds), and large measurement point multi-information quantity (the maximum support is 400 paths, and 270GB data quantity can be generated every day).
Because the data is written by the SQL general retrieval statement, the SQL general retrieval statement can be conveniently connected with engines for big data analysis, machine learning and the like.
Example 2
The technical effects adopted in the method are verified and explained, in the embodiment, a method for recording continuous waveforms based on a Commtrade file format is selected and compared with a method for performing comparison test by adopting the method, and test results are compared by means of scientific demonstration to verify the real effects of the method.
According to the conventional method for recording continuous waveforms based on the Comtrade file format, the Comtrade file format is used as a general waveform recording format of a power system, a compression mode is undefined, so that the required storage space is too large, the continuous recording time length and the waveform sampling frequency are limited under the condition of limited disk capacity, a storage mode is defined in a file mode, and the recorded data cannot be conveniently and efficiently retrieved, analyzed, counted and shared when used, so that the application of the recorded data in new technologies such as big data, machine learning and the like is limited.
According to the method, the continuous waveform data are stored in the time sequence database supporting the SQL query statement, so that the continuous wave recording data can be conveniently and efficiently used, and the time sequence database can efficiently store and rapidly process massive time sequence big data by using a special storage mode; the ring shared memory is used, so that the problems of efficiency loss and memory fragmentation caused by traditional frequent application and memory space release are solved, and the data exchange speed is effectively improved.
And (3) testing environment:
a CPU: 2.0 GHz; memory: 8 GB; and OS: win 1064 bit.
Sampling rate: 10 kHz.
And (3) testing time: for 60 minutes.
The method comprises the steps of writing Java program to circularly insert waveform data, writing a batch file to call the Java program, calling the batch file through LR system () function, and respectively adopting the traditional method for recording continuous waveforms based on Commride file format and the method of the invention to test. The first table is the comparison result of the traditional method and the method for processing the waveform data, and the second table is the comparison result of the dynamic memory and the annular memory when the waveform data are processed.
Table 1: and respectively adopting a Comtrade mode and a time sequence database to process a result comparison table of the waveform data.
As can be seen from table 1, the storage space required by the present invention is greatly reduced compared to the conventional Comtrade file format, and the query speed for each waveform data is also greatly improved.
Table 2: and respectively adopting a dynamic memory and a ring memory to execute a result comparison table for processing waveform data with small capacity for 100 ten thousand times.
As can be seen from table 2, the speed of processing data by the ring-shaped shared memory area adopted in the present invention is greatly increased compared to the speed of processing data by the conventional dynamic memory, and the memory fragmentation rate is reduced.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A continuous waveform recording method based on database technology is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
initializing a ring-shaped shared memory area and an in-process cache area, collecting waveform data and writing the waveform data into the in-process cache area;
based on time marks, aligning the waveform data, and writing the aligned cache data into the annular shared memory area to complete the receiving of the cache data;
and storing the cache data through a structured query statement to complete the recording of continuous waveforms.
2. The database technology-based continuous waveform recording method according to claim 1, wherein: the ring-shaped shared memory area comprises,
when the data receiving process is started, a piece of continuous memory space with a fixed size is applied to the shared memory area, and the continuous memory space is organized into a ring shape through a private data structure.
3. The database technique-based continuous waveform recording method according to claim 2, characterized in that: the in-process cache area includes,
data is cached in a site or area within a process of a service.
4. A method of continuous waveform recording based on database technology according to claim 3, characterized in that: after the cache data are aligned, the method further comprises,
calculating an effective value, a harmonic wave, a sequence component and an unbalance degree of the electric power data based on the data acquired in real time;
and analyzing the data of the out-of-limit event and judging the fault type.
5. The database technology-based continuous waveform recording method according to claim 4, wherein: the types of failures, including,
line ground faults, line short circuit faults, transformer internal faults, transformer external faults, generator faults, and magnetizing inrush currents.
6. The database technique-based continuous waveform recording method according to claim 5, characterized in that: the storing includes the steps of storing a plurality of data files,
and writing the cache data into a time sequence database by adopting parallel structured query statement formatting and parallel multithreading.
7. The database technique-based continuous waveform recording method according to claim 6, characterized in that: the time series database includes a list of time series,
a specialized database for storing and managing time series data, including metrics, tags, domains, metric values, timestamps, data points, time series, time precision, data groups, and aggregations.
8. The database technique-based continuous waveform recording method according to claim 7, wherein: the time-series data, including,
based on the time change, the degree of change is reflected by the numerical value, and the calibers of each datum are consistent.
9. The database technique-based continuous waveform recording method according to claim 8, wherein: the parallel structured query statement formatting includes,
and formatting the floating point type data read from the annular shared memory area into a structured query statement.
10. The database technique-based continuous waveform recording method according to claim 9, wherein: the parallel multithreading includes executing a plurality of parallel multithreading,
and establishing connection with a time sequence database and transmitting the SQL sentences after the threads are formatted to the time sequence database through a connection channel.
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| CN109994131A (en) * | 2019-04-10 | 2019-07-09 | 广西电网有限责任公司玉林供电局 | A kind of power frequency recorded wave file compression and storage method and system based on index |
| CN111143092A (en) * | 2019-12-31 | 2020-05-12 | 科华恒盛股份有限公司 | Fault recording data processing method and system and terminal equipment |
| CN111444146A (en) * | 2020-03-27 | 2020-07-24 | 中核武汉核电运行技术股份有限公司 | Nuclear power unit DCS data acquisition and storage method |
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| CN112529736A (en) * | 2020-12-28 | 2021-03-19 | 成都工百利自动化设备有限公司 | Online wave recording method and system for distributed power grid |
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