JP5100044B2 - Data collection method in case of power system accident - Google Patents

Description

  The present invention relates to a data collection method in the event of a power system failure, and more particularly to a data collection method that collects data from each slave station for a certain period of time at substantially the same time when a power system failure occurs.

  As conventional data collection methods at the time of an accident, for example, there are those described in Patent Documents 1 and 2 below. In this data collection method at the time of an accident, when an optical cable or an optical fiber is used for transmission, a slave station that detects the accident transmits data to the master station for each slave station.

  As another conventional data collection method at the time of an accident, for example, there is one described in Patent Document 3 below. This system does not use an optical cable, but the time of the accident is determined by the master station based on the time data and waveform data notified and transmitted to the master station from one of the slave stations that detected the accident. Identify and notify the time of the accident to the slave station, and command each slave station to transmit the data acquired in the period near the accident time, so that not all the data held in the slave station but near the accident time Only the data is transmitted from each slave station to the master station.

As described above, in the conventional data collection method at the time of an accident, the data at the time of an accident captured by each slave station is transmitted to the master station depending on the determination of each slave station. Also, it is assumed that the accidents captured at each slave station are the same.
Japanese Patent Laid-Open No. 10-206486 JP-A-8-94698 JP 2004-132762 A

  The conventional method of collecting data at the time of an accident is that each slave station detects an accident and the slave station that detected the accident transmits the data at the time of the accident to the master station. Since the slave station that does not recognize the detection of data does not transmit data to the master station, there is a problem that the master station cannot collect data at the time of an accident from all the slave stations. Also, since it is assumed that the accidents captured at each slave station are the same, and the transmission of the data at the time of the accident to the master station is left to the slave station, the data collected and analyzed by the master station is the same accident. May not be the data. For example, in the case of a ground fault in a transmission / distribution line, the sound state and the accident state may be repeated in a short time, but depending on the slave station, the accident state before or after one cycle of the accident state of interest may be referred to the master station. May be reported.

  The present invention solves the above-mentioned problems, and its purpose is to collect data for a certain period of time at the same accident from all the slave stations even if there are slave stations that have not detected an accident. An object of the present invention is to provide a data collection method at the time of an accident of a power system that can be performed and the collected data can be made appropriate depending on the type of accident.

In order to achieve the above-described object, the present invention provides an accident data collection system for a power system in which a master station and a plurality of slave stations installed on a transmission / distribution line are connected via a transmission line of an optical cable. Each of the plurality of slave stations collects data, which is a physical quantity of the power system, holds data for a certain period including the latest data, detects an accident from the held data, and detects the parent when the accident is detected. Means for notifying the station of a change in the state of the power system (hereinafter referred to as “state change”) and the type of the accident, and the master station notifies the state change from any of the plurality of slave stations. When received, the master station has a means for instructing the plurality of slave stations to stop updating data, and the master station is notified of a change in status from any of the slave stations. By stopping the update of the data held, each slave station Crucible so as to hold data for a period of time at the same time, by the state change accidents type from the notified slave station received with該状variable notification, determine the delay time of a predetermined basis accident type, the delay The first feature is that a command to stop updating the data is issued to each of the slave stations after a lapse of time .

In addition, the present invention is characterized in that, after the master station issues a data update stop command to the plurality of slave stations, the slave station sequentially issues a command requesting data transmission to each slave station. There are two features.

Further, according to the present invention, a slave station that has received a data update stop command and a data transmission request command from the master station stops updating the held data and transmits the held data to the master station. There is a third feature in this point.

Furthermore, the present invention provides at least the notification of the status change and accident type of the system performed from the slave station to the master station, and the instruction to stop updating the slave station data performed from the master station to the slave station, A fourth feature is that high-speed transmission is performed via the transmission path of the optical cable.

According to the first aspect of the present invention, since the slave station transmits only the system state change and the accident type to the master station when an accident is detected, the slave station can promptly notify the master station of the occurrence of the accident. Further, since the master station receives the notification of the occurrence of the accident from the slave station at an early stage, the master station can promptly issue a data update stop command to the slave station. For this reason, it becomes possible to make the slave station hold data for an appropriate period after the accident occurs. In addition, efficient accident data is accumulated, and a system that is the basis for accident point location and section determination can be provided. In addition, since the master station issues a new data collection stop command to each slave station after a delay time corresponding to the accident type, it becomes possible to collect data for a period or time suitable for the accident type.

According to the second and third aspects of the invention, since the master station 6 issues a command for requesting data transmission to each slave station sequentially, data is collected even from slave stations that are not aware of the accident. Will be able to. That is, it becomes possible to collect data on the same accident without omission of slave stations.

According to the invention of claim 4 , the notification of the state change of the system and the accident type performed from the slave station to the master station, and the stop instruction for updating the slave station data performed from the master station to the slave station, Since the transmission is performed via a transmission line of a large-capacity optical cable, even if each slave station is installed at a different position over a long distance, the reception time of the data and commands received between the master station and each slave station It becomes possible to ensure the identity.

According to the fifth and sixth aspects of the present invention, it is possible to provide a slave station and a master station having a configuration suitable for data collection at the time of a power system accident, respectively.

  Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a diagram showing a system configuration of data collection at the time of an accident, FIG. 2 is a block diagram showing a functional configuration of a master station and a slave station, and FIG. 3 is a diagram showing an operation flow of the master station and the slave station. .

  As shown in FIG. 1, the system configuration of an embodiment of the present invention includes a plurality of slave stations 3A, 3B,..., 3M, 3N on a transmission / distribution line 2 that supplies power from a substation 1. These substations collect and monitor physical quantities such as line voltage, phase voltage, phase current, zero phase current, and zero phase voltage of the transmission and distribution lines by each sensor 4. These slave stations are connected to an optical cable 5 laid along the transmission / distribution line 2, and the optical cable 5 is further connected to a master station 6. As the optical cable 5, a multi-core optical cable is preferably used in order to perform high-speed data transmission.

  Next, schematic configurations of the slave stations 3A, 3B,..., 3M, 3N and the master station 6 will be described with reference to FIG. Since the slave stations 3A, 3B,..., 3M, 3N have the same configuration, the slave station 3A will be described as a representative.

  In order to synchronize the time collected by each slave station, the master station 6 generates time information by the time information generator 15 and transmits it to each slave station. This time information is transmitted to the slave station 3A via the optical cable 5, and the slave station 3A reproduces the time information by the time information reproduction unit 26 via the communication unit 22. In this way, synchronization between the master station 6 and each of the slave stations 3A, 3B,..., 3M, 3N is ensured. Furthermore, high-accuracy synchronization can be ensured by correcting a delay in the optical cable 5.

  The slave station 3A receives measurement waveforms such as line voltage, phase voltage, phase current, zero phase current, and zero phase voltage, which are physical quantities of the transmission and distribution line 2 sensed by the sensor 4, and performs filtering processing by the measurement unit 23. . Next, the filtered measurement waveform is sampled based on the time synchronization pulse reproduced by the time information reproduction unit 26 and stored in the waveform storage unit 24 together with the time information as the latest data. For example, when data exceeding a predetermined storage capacity is input, the waveform storage unit 24 erases old data and stores new data. Thus, the data holding range of the waveform storage unit 24 depends on the storage capacity. The accident detection unit 25 constantly monitors the presence or absence of an accident from the data stored in the waveform storage unit 24. When an accident is detected, the accident type is determined, the controller unit 21 is notified of the accident detection and the accident type, and the controller unit 21 notifies the master station 6 of the state change (state change) and the type of accident at high speed via the communication unit 22 via the optical cable 5.

  The master station 6 confirms the state change of the slave station 3A by the control unit 11 via the communication unit 12, and confirms the delay time by the accident type by the accident type delay setting unit 17 set in advance by the accident type transmitted at the same time. Then, the control unit 11 instructs each slave station to stop data collection via the communication unit 12 after the delay time. The stop instruction for the slave station 3A is also transmitted simultaneously with each slave station via the optical cable 5 at high speed. The controller unit 21 confirms the stop command from the master station 6 received via the communication unit 22, instructs the measurement unit 23 to stop sampling, and instructs the waveform storage unit 24 to stop storage. The controller unit 21 confirms the stop of the collection and returns a message indicating the stop to the master station 6.

  After confirming the collection stop of the slave station 3A, the control unit 11 of the master station 6 transmits another waveform collection instruction to each slave station. Each slave station responds to this. For example, the controller unit 21 of the slave station 3A transmits the data stored in the waveform storage unit 24 to the master station 6 together with time information. The master station 6 records the collected data of the slave station 3 </ b> A and its time information in the storage unit 13.

  The master station 6 sequentially collects and records data from each slave station, and then the accident analysis unit 16 analyzes the data of the same time zone transmitted from each slave station to reconfirm the accident type and specify the accident section. And location of accident points. The man interface unit 18 performs various types of analysis, displays waveforms on the display unit 14, and inputs analysis result display.

  Next, the operation of the system of this embodiment will be described with reference to FIGS. Each slave station 3A, 3B,..., 3M, 3N monitors the power transmission / distribution line 2 that is a power system with each sensor 4, and at time t1, for example, a micro ground fault or ground fault occurs on the transmission / distribution line 2. If an accident 7 such as an accident or a short-circuit accident occurs, the slave station 2B on the power source side in the vicinity of the accident 7 first detects the accident. The slave station 2B determines the accident type together with the detection of the accident, and notifies the master station 6 of the state change and the accident type. Here, since the slave station 2B only notifies the accident, the slave station 2B can promptly notify the master station 6 of the accident. Note that the notification of the accident to the master station may be made not only from one slave station but also from a plurality of slave stations.

  When the master station 6 receives the notification of the accident from the slave station 2B, the master station 6 confirms the notification of the state change and collects data from the slave stations 3A, 3B,..., 3M, 3N according to the accident type transmitted at the same time. Decide the correct time. In this case, the master station 6 has, for example, a table (data) of predetermined delay times for each accident type, and determines the delay time by comparing the accident type received from the slave station with the table. To do. In this table, for example, in the case of a short circuit accident, a large current flows early, so that the delay time is short, and in the case of a micro ground fault, the state may continue, so the delay time is set somewhat long.

  The master station 6 requests the slave stations 3A, 3B,..., 3M, 3N to stop data collection simultaneously after a time delay corresponding to the accident type (time t2). Thereby, each of the slave stations 3A, 3B,..., 3M, 3N ensures a data collection range or period of the same time zone. The data collection range or period can be the data holding range of the waveform storage unit 24 (see FIG. 2) of the slave station.

  After the data collection is stopped, the master station 6 sequentially requests each slave station 3A, 3B,..., 3M, 3N to transmit the data held by each slave station to the master station 6 in a communication form called polling ( Waveform data request). In response to the data transmission request, each slave station sequentially transmits the requested data to the master station 6 (waveform data response). As a result, the master station 6 can collect data at the time of the accident in the same time zone of each slave station. Data collection after the stop may be performed at any time at each slave station. Since the data collection does not necessarily need to be performed at high speed, communication different from communication using an optical cable may be used. When the data collection of the last slave station 3A is completed, the master station 6 resumes the data collection start request, which is a normal operation, from time t3.

  Since the data collected by the master station 6 is data at the time of an accident in each slave station as described above, waveform data between each slave station can be obtained by superimposing waveform data from each slave station. Transition and / or delay information acquisition, phase information acquisition, etc., and can be used for accident knowledge (accident cause estimation, accident point location, etc.).

  As described above, according to the present embodiment, the slave station 3B that first detects an accident only notifies the master station 6 of the detection of the accident and the accident type. The amount of data transmitted to is very small. For this reason, after the accident occurs, the time until the notification of the occurrence of the accident from the slave station to the master station can be made very short. Thus, since the master station 6 can quickly detect the occurrence of an accident, it becomes possible to instruct each slave station to stop collecting new data at an appropriate time after the accident. In other words, in the method of the present embodiment, the slave station 3B takes time to notify the accident by transmitting a large amount of accident data to the master station, and the master station appropriately transmits the waveform data at the time of the accident to each slave station. This method eliminates the possibility of being unable to collect data.

  In addition, since the master station 6 issues a new data collection stop command to each slave station after a delay time corresponding to the accident type, it becomes possible to collect data suitable for the accident type. For example, if the accident type is a short-circuit accident, a new data collection stop command is issued to each slave station after a short delay time, while in the case of a slight ground fault, a somewhat long delay time is issued.

  Further, since the master station 6 collects data at the time of the accident of each slave station by polling, data can be collected also from a slave station that has not recognized the occurrence of the accident.

  In addition, since data and commands are transmitted between the master station 6 and each slave station by optical transmission using an optical cable, the data and commands can be transmitted at high speed, and each slave station is long. Even if they are installed at different positions that are separated from each other, it is possible to ensure the same reception time of the data and commands that are made between the master station and each slave station.

It is a figure showing a schematic structure of a data collection system at the time of an accident concerning one embodiment of the present invention. It is a block diagram which shows the rough functional structure of the main | base station and sub_station | mobile_unit which comprise the data collection system at the time of the accident of this invention. It is a flowchart which shows the flow of the data collection at the time of the accident in this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Substation, 2 ... Transmission / distribution electric wire, 3A, 3B, 3M, 3N ... Slave station, 4 ... Sensor, 5 ... Optical cable, 6 ... Master station, 7 ...・ Accident, 11 ... Control unit, 12, 22 ... Communication unit, 13 ... Storage unit, 14 ... Display unit, 15 ... Time information generation unit, 16 ... Accident analysis unit, 17 ... accident type delay setting unit, 21 ... controller unit, 23 ... measurement unit, 24 ... waveform storage unit, 25 ... accident detection unit, 26 ... time information reproduction unit.

Claims (6)

In the accident data collection method of the power system in which the master station and multiple slave stations installed on the transmission and distribution line are connected via the optical cable transmission line,
Each of the plurality of slave stations collects data, which is a physical quantity of the power system, holds data for a certain period including the latest data, detects an accident from the held data, and detects the parent when the accident is detected. Means for notifying the station of changes in the state of the power system (hereinafter referred to as “state changes”) and the type of accident,
The master station has means for issuing a data update stop instruction from the master station to the plurality of slave stations when notification of a change in state is received from any of the plurality of slave stations,
When the master station is notified of the status change from any of the slave stations, the master station stops updating the data held by the plurality of slave stations so that each slave station holds data for a certain period of time at substantially the same time. A delay time for each predetermined accident type is obtained from the accident type received together with the status change notification from the slave station that has notified the status change, and each data update stop command is issued after the delay time has elapsed. A data collection method at the time of an accident in the power system, which is performed for a slave station . 2. The power according to claim 1, wherein the master station issues a command for sequentially requesting data transmission to each slave station after issuing a command to stop updating data to the plurality of slave stations. Data collection method at the time of system accident. Slave station that receives the transmission instruction of the stop command and data update of the data from the master station stops the updating of the data held, claim 2, characterized in that to transmit the data to the holding to the master station The data collection method at the time of the power system accident described in 1. At least the status change of the system and the type of accident performed from the slave station to the master station, and the instruction to stop updating the slave station data from the master station to the slave station are transmitted via the transmission line of the optical cable. data collection method at the time of the accident in the power system according to any one of claims 1 to 3, characterized in that it is high-speed transmission Te. The slave station is
A measurement unit that samples the waveform collected by filtering the physical quantities of the power system;
A data storage unit that updates the latest value of the data obtained by sampling of the measurement unit for each sampling and holds data for a certain period;
An accident detection unit that detects an accident from the data stored in the data storage unit and determines an accident type;
A communication unit that performs high-speed large-capacity transmission between the master stations via the optical cable;
A controller unit that at least performs update processing, stoppage, and start notification processing of data in the storage unit according to communication content and accident detection content;
The data collection method at the time of an accident of the electric power system according to claim 1 characterized by comprising. The master station is
A communication unit that performs high-speed large-capacity transmission between the slave stations via the optical cable;
A storage unit for storing data collected from the slave station;
A display unit for displaying data and accident types stored in the storage unit;
A control unit for at least instructing to stop updating data and instructing data collection of each slave station by notification of status change and accident type from the slave station;
The data collection method at the time of an accident of the electric power system according to claim 1 characterized by comprising.

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