JP6373236B2 - calculator - Google Patents

Description

  The present disclosure relates to a technique for improving the processing stability of a computer included in a power system control system.

  A system that monitors an object to be monitored by an operator, such as an electric power system control system, for example, a console that accepts an operator's operation, receives a processing request from the console, performs business processing, and returns a processing result to the console It consists of a computer. The power system control system includes a plurality of computers. These computers maintain a database including information on devices such as switches that are monitored objects.

  For example, when there is a change in the installation status of each device to be monitored, the database held in each computer needs to be updated. For this database update, for example, when a database update computer that accepts an operation to update a database from an operator performs a database update operation, the database update computer transfers the data files that make up the database to other data via the network. Send to computer. At this time, in order to prevent the network bandwidth from being excessively consumed, the database update computer compresses the data file constituting the database and transmits the compressed data file to another computer. The computer receives the compressed data file from the database updating computer, and updates the database by performing decompression processing on the received compressed data file.

  Various techniques have been studied in order to efficiently write data. For example, Japanese Patent Application Laid-Open No. 10-336366 describes a technique in which data is exchanged in a time-sharing manner using a dedicated hardware circuit, and data writing and reading are apparently performed simultaneously.

Japanese Patent Laid-Open No. 10-336366

  However, when a computer receives a data file and decompresses the received data file to update the data held on the disk, the larger the data size of the data file, the larger the disk load when writing to the disk. In the meantime, other processing of the computer is made to wait. In particular, when the computer performs a process that requires real-time properties, it is preferable to execute the process as early as possible.

  The objective of this indication is related with the technique which improves the stability of the process of the computer contained in an electric power system control system.

  A computer included in a power system control system according to an embodiment includes a communication unit configured to receive a compressed data file subjected to data compression processing, and a disk capable of holding data. A data holding unit configured to hold data by accepting writing of data to the memory, a memory, and a control unit for controlling the operation of the computer. The control unit performs decompression processing on the received compressed data file, stores the decompressed data file subjected to decompression processing in the memory, and the memory according to the setting of the writing speed for writing data to the disk. And an adjustment processing unit that divides the decompressed data file held in the disk and writes it to the disk.

  The computer according to the above-described embodiment can control the writing speed to the disk at an arbitrary speed when decompressing the compressed file. Therefore, the update of the database by the decompressed data file can be executed while suppressing the disk load, and the computer processing can be stabilized.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

It is a figure which shows the structure of the electric power grid | system control system of Embodiment 1. FIG. 2 is a block diagram showing a configuration of a computer 10. FIG. FIG. 10 is a diagram comparing the magnitude of the disk load and the time until writing of the decompressed data file is completed when the writing speed is not adjusted and when the decompressed data file is written to the disk device according to the setting of the writing speed. FIG. 10 is a diagram for explaining details of data file decompression processing by a writing speed adjustment processing unit 173;

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Embodiment 1>
With reference to the drawings, each device constituting the power system control system of the present embodiment will be described. The power system control system includes a plurality of computers and a plurality of consoles, and these devices are communicably connected to each other via a network such as a LAN (Local Area Network). The computer accumulates data for monitoring and controlling the system by sequentially receiving information indicating the state of the monitoring target such as a switch included in the system via the network. For example, a specific computer included in the power system control system collects information indicating the status of each device of the monitoring target via the network, and transmits the collected information to other computers, thereby Synchronize information indicating the state of the monitored object. The computer receives instructions input from the console via the network and executes various business processes in the power system control system. For business processing, for example, execution of operation sequences for operating devices such as switches installed in various places, analysis and report processing when accidents occur, execution of power flow calculations, monitoring control by operators There are simulations and other processes for training.

  Each computer holds a database indicating, for example, the installation status of each device to be monitored. For example, when there is a change in the installation status of each device to be monitored, a database maintenance computer receives an input operation from the operator and updates the database. The computer for database maintenance transmits the updated database to other computers. At this time, the database maintenance computer compresses the data file indicating the database and transmits it to each computer in order to reduce the bandwidth consumed in the network. Each computer receives the compressed data file and updates the database by performing decompression processing (decompression processing) on the received data file. Specifically, for example, it is assumed that each computer holds a main database and a sub database for data multiplexing. When the computer receives the updated compressed data file of the database from the database maintenance computer, the computer performs decompression processing on the received compressed data file and updates the decompressed data file as a sub database. When the sub database is updated with the decompressed data file, the computer switches between the sub database and the main database. That is, the database updated by the decompressed data file is set as the main database.

  1 is a diagram illustrating a configuration of a power system control system according to a first embodiment. As shown in FIG. 1, the power system control system shows a plurality of computers (in the example of FIG. 1, four computers of a computer 10A, a computer 10B, a computer 10C, and a computer 10D are shown, but the number is not limited to four. ), A DB maintenance computer 19, and a plurality of consoles (a console 20-1, a console 20-2, a console 20-3,... 20-N). These devices are connected via a network 90 such as a LAN (Local Area Network). Each computer has a business definition file and a definition file indicating the function of the computer, and each computer manages the types of business processing that can be executed by the computer. A plurality of computers may be collectively referred to as “computer 10”. A plurality of consoles (operator console 20-1, operator console 20-2, console 20-3,... 20-N) may be collectively referred to as “operator console 20”. The external interface computer 30 is a computer that serves as an interface for each computer to communicate with other devices via an external network. The external interface computer 30 is connected to a network such as the Internet.

  At least one of the computers receives information indicating the status of the devices 40A and 40B, such as a switch, which is an object to be monitored by the power system control system, from each device via the external interface computer 30. Computers that receive information indicating the status of each device synchronize data between computers by transmitting the received information to other computers.

  The DB maintenance computer 19 is a computer for accepting an operation for updating a database held by each computer from an operator. When there is a change in the installation status of the monitoring object, the operator performs a process of updating the database to the DB maintenance computer 19 in order to update the database held by each computer. When the database is updated by the operator, the DB maintenance computer 19 compresses the data file of the updated database and transmits the data file subjected to the compression process to another computer.

FIG. 2 is a block diagram showing the configuration of the computer 10.
The computer 10 includes a communication unit 102, a storage unit 106, and a control unit 107.

  The communication unit 102 is a communication interface that performs modulation / demodulation processing for transmitting and receiving signals so that the computer 10 can communicate with other devices.

  The storage unit 106 is configured by a disk device such as an HDD (Hard Disk Drive), a memory such as a flash memory and a RAM, etc., stores a program used by the computer 10, and accumulates various data used by the computer 10.

  In a certain aspect, the storage unit 106 stores a device database 161. The device database 161 is a database that includes information such as the installation status of each device that is to be monitored by the power system control system. The storage unit 106 includes, for example, a disk-type storage device such as an HDD capable of holding a large amount of data, and holds the database by accepting database writing to the disk-type storage device. In addition, the storage unit 106 stores a writing speed setting for writing data to the disk-type storage device. The setting of the writing speed includes the setting of the data size when the expanded data file is divided and written to the disk, and the setting of the time interval for writing each of the divided expanded data files to the disk.

  The control unit 107 controls the operation of the computer 10 by reading and executing a program stored in the storage unit 106. The control unit 107 is realized by, for example, one or a plurality of processors. The control unit 107 functions as a business processing unit 171, a file decompression unit 172, and a writing speed adjustment processing unit 173 by operating according to a program.

  When the business processing unit 171 receives a processing request from each console, the business processing unit 171 performs processing according to the processing request.

  The file decompression unit 172 performs decompression processing on the compressed data file received from another computer such as the DB maintenance computer 19 by the communication unit 102, and holds the decompressed data file subjected to decompression processing in the memory. Let

  The writing speed adjustment processing unit 173 divides the expanded data file held in the memory and writes it to the disk according to the setting of the writing speed for writing data to the disk device. Specifically, the writing speed adjustment processing unit 173 divides the decompressed data file for each preset data size, and each of the divided decompressed data files according to a preset time interval setting. Write to disk unit. For example, when a plurality of writing speed settings are stored in the storage unit 106, the writing speed adjustment processing unit 173 switches the writing speed setting according to the type of task to be executed by the computer 10.

  The tasks scheduled to be executed by the computer 10 include, for example, (A) a task that occurs when the state of a device to be monitored such as a switch (for example, opening / closing of a switch), and (B) sensing at a fixed period. (C) a task for receiving a received signal from an external network and performing a primary process such as updating a database, (C) a task for executing an operation command in sequence such as an instruction to the site where the monitoring target is installed, and (D) There are a task for updating the database, (E) a task for performing training for the operator, (F) a task for simulating driving, and (G) a task for the operator to check past data. Among these tasks, (D) a task for updating a database, (E) a task for training an operator, (F) a task for simulating driving, (G) an operator storing past data Assuming that the task to be confirmed is a task for performing the first business process, the second business process to be processed with priority over the first business process includes (A) a monitoring target such as a switch. Tasks that occur when the state of the device changes (for example, opening and closing of a switch), (B) A task that receives a signal sensed at a fixed cycle from an external network and performs primary processing such as database update, (C) It is good also as including tasks, such as a task which gives a driving command, such as directions to the field where a monitoring subject is installed.

  Here, it is assumed that the storage unit 106 stores a first setting in which the writing speed for writing data to the disk device is high and a second setting in which the writing speed is lower than the first setting. . In this case, when executing the first business process, the write speed adjustment processing unit 173 divides the decompressed data file according to the first setting (high speed) of the write speed, writes it to the disk device, and performs the second business process. In the case of executing, the decompressed data file may be divided and written to the disk device in accordance with the second setting (low speed) of the writing speed. Thereby, in order to execute the second business process to be preferentially processed without delay, (D) in the task of updating the database, the writing of data to the disk is divided, and the sleep time of the database update process ( The time shown in the time interval for writing data is secured.

  In addition, the writing speed adjustment processing unit 173 receives the information that estimates that the possibility of occurrence of the second business process is improved, thereby changing the writing speed setting from the first setting (high-speed writing) to the first setting. It is also possible to switch to setting 2 (write at low speed) and write the decompressed data file to the disk device. Information indicating the change in weather and the occurrence of disasters in the area where the monitoring target object to be monitored by the power system control system is installed as information for estimating the possibility that the second business process will occur , Information indicating that the amount of change in the power supply amount exceeds a threshold, information indicating a time zone in which the amount of change in the power supply amount is predicted to exceed the threshold, and the like. That is, when there is a high probability that the status of each device that is the monitoring target of the power system control system will change, the disk load when writing the decompressed data file to the disk is reduced.

<Operation>
Processing in which the computer 10 receives the compressed data file, decompresses the received compressed data file, and updates the database by writing the decompressed data file to the disk device according to the writing speed setting will be described.

  FIG. 3 is a diagram comparing the amount of disk load and the time until writing of the decompressed data file is completed when the writing speed is not adjusted and when the decompressed data file is written to the disk device according to the setting of the writing speed. It is. Here, the “decompression time” indicates the time until the computer 10 receives the compressed data file and completes the process of writing the decompressed data file obtained by decompressing the received compressed data file to the disk device.

  The state (A) in FIG. 3 shows the disk load when the computer 10 does not perform the processing of the write speed adjustment processing unit 173 of this embodiment, and the computer 10 decompresses the compressed data file and immediately writes it to the disk device. It is a figure which shows the relationship with expansion | extension time.

  The state (B) of FIG. 3 is a diagram when writing the decompressed data file to the disk device according to the setting of the writing speed by the processing of the writing speed adjustment processing unit 173 of the present embodiment.

  Comparing the state (A) and the state (B) in FIG. 3, when the processing of the writing speed adjustment processing unit 173 of this embodiment is not executed (state (A)), the data file extension time becomes relatively short. Since the disk load increases, processing such as waiting for other processing of the computer 10 is required. Referring to the state (B) of FIG. 3, due to the processing of the writing speed adjustment processing unit 173, the data file expansion time becomes relatively long and the disk load is reduced.

  FIG. 4 is a diagram for explaining the details of the data file expansion processing by the writing speed adjustment processing unit 173.

  The computer 10 receives a compressed data file for updating the database from the DB maintenance computer 19 through the communication unit 102.

  The file decompression unit 172 performs decompression processing on the received compressed data file. The algorithm used for the decompression process at this time is, for example, a general decompression process (for example, a process for decompressing data compressed by a general-purpose data compression algorithm, such as the gzip command, the uncompress command, and other commands). To decompress the file. The file decompression unit 172 holds the decompressed data file that has been decompressed in the memory. The file decompression unit 172 passes the decompressed data file to the processing performed by the writing speed adjustment processing unit 173. When the file decompression unit 172 delivers the decompressed data file to the writing speed adjustment processing unit 173, the data is delivered as binary data instead of using a special data format. As a result, the decompressed data file can be transferred from the file decompression unit 172 to the processing performed by the writing speed adjustment processing unit 173 by a general process such as pipeline processing.

  The writing speed adjustment processing unit 173 receives the decompressed data file, and writes data of a predetermined size to the disk device at predetermined time intervals according to the setting of the writing speed. That is, the writing speed adjustment processing unit 173 divides the decompressed data file and writes it to the disk device according to the time interval setting. Note that the parameter for setting the writing speed includes a time interval and data size. The computer 10 can accept an operation for changing the setting of the time interval and the setting of the data size from the operator.

<Embodiment 2>
In the computer 10 according to the first embodiment, it has been described that the setting of the time interval for dividing and writing the decompressed data file to the disk device can be switched. For example, when the computer 10 receives information indicating a time zone in which the amount of change in the power supply amount is predicted to exceed the threshold, the state change of the device that is the monitoring target is detected in the predicted time zone. It is predicted that the probability that it will occur is high. Therefore, the writing speed adjustment processing unit 173 of the computer 10 selects the file writing speed setting so that the disk load when writing the decompressed data to the disk is relatively low during this time period.

<Embodiment 3>
Each time the computer 10 divides and writes the decompressed data file from the memory to the disk device, the computer 10 refers to the type of task executed by the computer 10 and determines the writing speed setting according to the type of task. The decompressed data file may be written to the disk device according to In other words, each time the computer 10 divides and writes the decompressed data file, if the task to be processed with priority such as the second business processing shown in the first embodiment is executed, the computer 10 has decompressed the disk device. If the time interval for writing the data file is relatively long and the first job process is being executed, the time interval for writing the decompressed data file to the disk device may be shortened.

  In a certain aspect, the computer and the console according to the present embodiment are realized by a processor and a program executed by the processor. The program for realizing the present embodiment is provided by transmission / reception using a network via a communication interface.

  The embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 computers, 19 DB maintenance computers, 20 consoles, 30 external interface computers, 40 devices, 90 networks.

Claims (8)

A computer included in a power system control system,
The calculator is
A communication unit configured to receive a compressed data file subjected to data compression processing;
A data holding unit configured to hold data by having a disk capable of holding data and accepting writing of data to the disk;
Memory,
A control unit for controlling the operation of the computer,
The controller is
A decompression processing unit that decompresses the received compressed data file and holds the decompressed data file subjected to the decompression process in the memory;
A computer including an adjustment processing unit that divides the decompressed data file held in the memory and writes the data to the disk according to a setting of a writing speed for writing data to the disk The writing speed is set by setting a data size when the expanded data file is divided and written to the disk, and setting a time interval for writing each of the divided expanded data files to the disk. Including
The adjustment processing unit of the control unit divides the decompressed data file for each preset data size, and sets each of the divided decompressed data files to the preset time interval. The computer of claim 1, configured to write to the disk according to: The calculator is configured to store at least two write speed settings;
The computer according to claim 1, wherein the adjustment processing unit of the control unit is configured to switch the setting of the writing speed according to a type of a task scheduled to be executed by the computer. The types of tasks executed by the computer include at least first business processing and second business processing to be processed with priority over the first business processing,
The calculator is configured to store a first setting for writing data to the disk and a second setting for which the writing speed is low compared to the first setting;
The adjustment processing unit of the computer, when executing the first business process, divides the decompressed data file according to the first setting of the writing speed and writes the divided data file to the disk, and performs the second business process. The computer according to any one of claims 1 to 3, wherein when the operation is executed, the decompressed data file is divided and written to the disk according to the second setting of the writing speed.   The second business process is a process of executing a sequence including a plurality of operation instructions for each device to be monitored in the power system control system, or sensing data of each device to be monitored at a fixed cycle. The computer according to claim 4, further comprising at least one of processing for updating information indicating a state of each device.   The adjustment processing unit of the control unit receives the information that estimates that the possibility that the second business process will occur is improved, thereby changing the setting of the writing speed from the first setting to the second setting. The computer according to claim 4 or 5, wherein the computer is configured to switch to a setting and write the decompressed data file to the disk.   The adjustment processing unit of the control unit is an area where a monitoring target object to be monitored by the power system control system is installed as information for estimating that the possibility that the second business process will occur is improved. Shows information indicating weather change, information indicating the occurrence of a disaster, information indicating that the amount of change in power supply exceeds the threshold, and indicating the time period in which the amount of change in power supply exceeds the threshold 7. The computer according to claim 6, wherein the computer is configured to switch the setting of the writing speed to the second setting and write the decompressed data file to the disk by receiving at least one of the information. .   The adjustment processing unit of the control unit refers to the type of task executed by the computer each time the decompressed data file is divided and written to the disk, and the write speed is set according to the type of task. The computer according to any one of claims 1 to 3, wherein the computer is configured to determine and write the decompressed data file to the disk according to the determined setting.

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