Power system monitoring and control device, control method, power system monitoring system, and program

Abstract

To reduce the maintenance costs of the power grid. [Solution] The power system monitoring and control device comprises a data collection unit that collects measurement data, including measurement values ​​measured by each of a plurality of measuring instruments installed at various locations in the power system, via a communication line, and a control unit that transmits control information to the circuit breaker to be controlled via a communication line, based on the measurement data collected by the data collection unit, to control one of a plurality of circuit breakers installed in the power system to open, without using information from protective relays, regardless of whether protective relays are installed in the power system or not.

Description

Technical Field

[0001] The present disclosure relates to a power system monitoring and control device, a control method, a power system monitoring system, and a program.

Background Art

[0002] In order to protect a power system, it is necessary to install a protection relay panel at a local substation. At various locations in the power system, a plurality of protection relays and a plurality of circuit breakers are provided. When a protection relay detects an abnormality such as overcurrent, undervoltage, or leakage (ground fault) somewhere in the power system, it controls a predetermined circuit breaker to open and disconnect the abnormal location to play a role in protection.

[0003] However, a protection relay may also malfunction. For example, Patent Document 1 discloses a technique for transmitting appropriate application software from a server to a healthy protection relay and performing a setting change so that when a failure occurs in a protection relay, it can be operated by substituting with a surrounding healthy protection relay.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique disclosed in Patent Document 1, even if operation is performed using another protection relay until the failed protection relay returns, repair or replacement for returning the failed protection relay is required. In addition, aging deterioration also occurs in the protection relay due to long-term use. Therefore, maintenance costs for performing regular maintenance and replacement of the protection relay are required.

[0006] This disclosure is made in view of the circumstances described above, and one of its purposes is to provide a power system monitoring and control device, a control method, a power system monitoring system, and a program that can reduce the maintenance costs of power systems. [Means for solving the problem]

[0007] One aspect of the present disclosure is a power system monitoring and control device comprising: a data acquisition unit that collects measurement data, including measured values ​​measured by each of a plurality of measuring instruments installed at various locations in a power system, via a communication line; and a control unit that transmits control information to the circuit breaker to be controlled via the communication line, based on the measurement data collected by the data acquisition unit, to control one of a plurality of circuit breakers installed in the power system to be opened, without using information from the protective relay, regardless of whether or not a protective relay is installed in the power system.

[0008] Furthermore, one aspect of the present disclosure is a control method in a power system monitoring and control device, comprising the steps of: a data acquisition unit collecting measurement data, including measurement values ​​measured by each of a plurality of measuring instruments installed at various locations in the power system, via a communication line; and a control unit transmitting control information to the circuit breaker to be controlled via the communication line, based on the measurement data collected by the data acquisition unit, to control one of a plurality of circuit breakers installed in the power system to be opened, without using information from the protective relay, regardless of whether or not a protective relay is installed in the power system.

[0009] Furthermore, one aspect of the present disclosure is a power system monitoring control device comprising: a plurality of measuring instruments provided at various locations in the power system; a plurality of circuit breakers provided at various locations in the power system; a data acquisition unit that collects measurement data, including measurement values ​​measured by each of the plurality of measuring instruments, via a communication line; and a control unit that transmits control information to the circuit breaker to be controlled via the communication line, based on the measurement data collected by the data acquisition unit, to control one of the plurality of circuit breakers to be opened, without using information from the protective relay, regardless of whether or not a protective relay is provided in the power system.

[0010] Furthermore, one aspect of this disclosure is a program for causing a computer as a power system monitoring and control device to perform the following steps: collecting measurement data, including measured values ​​measured by each of a plurality of measuring instruments installed at various locations in the power system, via a communication line; and transmitting control information, via the communication line, to the circuit breaker to be controlled, which controls one of the plurality of circuit breakers installed in the power system to be opened, based on the collected measurement data, without using information from the protective relay, regardless of whether or not a protective relay is installed in the power system. [Effects of the Invention]

[0011] According to this disclosure, it is possible to provide a power system monitoring and control device, a control method, and a power system monitoring system that can reduce the maintenance costs of power systems. [Brief explanation of the drawing]

[0012] [Figure 1] A schematic block diagram showing an example of the configuration of a power grid monitoring system according to the embodiment. [Figure 2] A schematic diagram illustrating the control method for a circuit breaker according to the embodiment. [Figure 3] A schematic diagram showing an example of a configuration for controlling circuit breakers in a power system monitoring system according to an embodiment. [Figure 4]A schematic block diagram showing an example of the functional configuration of the monitoring and control server according to the embodiment. [Figure 5] A schematic diagram showing an example of multiple circuit breakers installed in a power system according to this embodiment. [Figure 6] A flowchart showing an example of circuit breaker control processing according to the embodiment. [Figure 7] A schematic block diagram showing an example of the hardware configuration according to the embodiment. [Modes for carrying out the invention]

[0013] The embodiments will be described below with reference to the drawings. [Configuration of the power grid monitoring system] First, an overview of the configuration according to this embodiment will be described. Figure 1 is a schematic block diagram showing an example of the system configuration of the power grid monitoring system 1 according to this embodiment. The power grid monitoring system 1 comprises a power grid 10 and a grid monitoring and control system 20. The power grid 10 is the object monitored by the grid monitoring and control system 20.

[0014] The power system 10 is a power system including transmission lines or distribution lines, and in this case, it includes the transmission line 11. Multiple circuit breakers 12 and multiple protective relays 13 (protective relays) are installed at various points on the transmission line 11. The protective relays 13 are responsible for controlling the opening of a predetermined circuit breaker 12 when they detect an abnormality such as overcurrent, undervoltage, or leakage (ground fault) somewhere in the power system 10, thereby isolating and protecting the abnormal location.

[0015] The system monitoring and control system 20 consists of a TC21, an online linkage server 22, a monitoring and control server 23, a projector server 24, and an operation base 25.

[0016] TC21 is a remote wireless device (telecontrol) used to monitor the status of equipment installed at various locations in the power system 10 from the system monitoring and control system 20.

[0017] The online cooperation server 22 cooperates with the TC21 and acts as an intermediary when the monitoring and control server 23 and the power system 10 exchange various information via the network NT. The network NT is a communication network such as the Internet or an intranet.

[0018] The monitoring and control server 23 collects, monitors, operates, and manages the information necessary for the operation of the power system 10, and provides support for accident response to the operator in order to quickly and accurately execute the restoration during an accident.

[0019] The projector server 24 receives the information to be displayed on the system monitoring and control panel at the operation base 25 from the monitoring and control server 23 and transmits it to the operation base 25 via the network NT. In addition, the projector server 24 outputs a switching signal for the screen to be displayed on the system monitoring and control panel. In addition, the projector server 24 edits the display data to be displayed on the system monitoring and control panel. The display on the system monitoring and control panel is performed from the projector clients at each operation base 25 connected to the projector server 24.

[0020] The operation base 25 is a base where an operator monitors and controls the power system 10 using the system monitoring and control system 20. On the system monitoring and control panel at the operation base 25, the status of the power system 10 transmitted from the monitoring and control server 23 and the information collected from various devices are displayed.

[0021] Here, in this embodiment, at least a part of the plurality of protective relays 13 provided in the power system 10 is removed and made software-based, and the function of the protective relay 13 is simulated on the side of the system monitoring and control system 20 (monitoring and control server 23) to control the circuit breaker 12.

[0022] Figure 2 is an explanatory diagram illustrating the overview of the control method for the circuit breaker 12 according to this embodiment. (A) is a schematic diagram showing a conventional control method for the circuit breaker 12 using a protective relay 13. Conventionally, the protective relay 13 monitored the power system 10 and, when it determined that a preset threshold (such as voltage or current threshold) had been exceeded, the protective relay 13 sent a command to the circuit breaker 12 to open it. In this case, the system monitoring and control system 20 obtained the result of the threshold determination (for example, binary information of upper limit and lower limit determination) from the protective relay 13 via the TC21.

[0023] In contrast, (B) is a schematic diagram showing the control method of the circuit breaker 12 in this embodiment. In the control method of the circuit breaker 12 in this embodiment, the protective relay 13 is removed compared to the conventional method in (A), and the system monitoring and control system 20 acquires measurement data from various points in the power system 10 and performs threshold determination. When the system monitoring and control system 20 determines that the threshold has been exceeded, it sends a command to the circuit breaker 12 via TC21 to open it.

[0024] Thus, the power system monitoring system 1 according to this embodiment controls the circuit breaker 12 by simulating the function of the protective relay 13 on the system monitoring and control system 20 (monitoring and control server 23) side based on measurement data (measurement data such as voltage and current) of the power system 10, without installing a protective relay 13 in the power system 10 (i.e., without using information from the protective relay 13).

[0025] As a result, the power system monitoring system 1 according to this embodiment eliminates the need for periodic maintenance and replacement of the removed protective relays 13, thereby reducing power system maintenance costs. In addition, the costs associated with not installing protective relays 13 can also be reduced. While the cost reduction effect described above would be maximized if all protective relays 13 in the power system 10 could be removed, even a configuration in which at least some of the protective relays 13 are removed, taking into account control response and other factors, can still provide sufficient cost reduction for the removed relays.

[0026] Next, in the power system monitoring system 1 according to this embodiment, the configuration and process of controlling the circuit breaker 12 by simulating the function of the protective relay 13 on the system monitoring and control system 20 (monitoring and control server 23) side will be described in detail.

[0027] Figure 3 is a schematic diagram showing an example of a configuration for controlling a circuit breaker 12 in the power system monitoring system 1 according to this embodiment. The system monitoring and control system 20 collects measurement data (such as voltage and current) from measuring instruments 15 installed at various points on the transmission lines 11 of the power system 10 to be monitored, via the network NT (1). In Figure 3, one measuring instrument 15 is shown as a representative example. The measuring instrument 15 can be a measuring instrument that is commonly installed in power systems in the past.

[0028] Furthermore, the system monitoring and control system 20 monitors for abnormalities in the power system 10 based on the collected measurement data, and if an abnormality is detected, it transmits a command (control information) to the circuit breaker 12 to open, with the aim of disconnecting the abnormal section from the transmission line 11 (2). The circuit breaker 12 opens and shuts off in response to the command from the system monitoring and control system 20. In this way, the system monitoring and control system 20 remotely shuts off the abnormal section (fault section) of the power system 10 (transmission line 11).

[0029] The function of this system monitoring and control system 20 to control the circuit breaker 12 by simulating the function of the protective relay 13 is mainly performed by the monitoring and control server 23 via the TC21 and the online cooperation server 22. Next, the functional configuration of the monitoring and control server 23 that controls the circuit breaker 12 by simulating the function of the protective relay 13 will be described.

[0030] Figure 4 is a schematic block diagram showing an example of the functional configuration of the monitoring and control server 23 according to this embodiment. The monitoring and control server 23 comprises a data collection unit 231, an anomaly detection unit 232, a control unit 233, and a control information storage unit 234.

[0031] The data acquisition unit 231 collects measurement data, including measured values ​​(voltage values, current values, etc.) measured by each of the multiple measuring instruments 15 installed at various locations in the power system 10, via the network NT. For example, the data acquisition unit 231 acquires measurement data from the measuring instruments 15 at predetermined intervals.

[0032] The anomaly detection unit 232 determines, based on the measurement data collected by the data acquisition unit 231, whether the measured values ​​measured by each of the multiple measuring instruments 15 exceed a preset threshold. This allows the anomaly detection unit 232 to detect a change in the state of the power system 10 and detect an anomaly in the power system 10.

[0033] For example, the abnormality detection unit 232 detects an abnormality if the measured value remains above a preset threshold for a predetermined period of time or longer. When the abnormality detection unit 232 detects an abnormality in the power system 10, it outputs the detection result to the control unit 233. The threshold is stored, for example, in the control information storage unit 234, and the abnormality detection unit 232 makes a determination by referring to the threshold stored in the control information storage unit 234.

[0034] When the abnormality detection unit 232 detects an abnormality, the control unit 233 transmits a command (control information) to the circuit breaker 12 to be controlled via the network NT to control one of the multiple circuit breakers 12 installed in the power system 10 to open. In other words, the control unit 233 transmits a command (control information) to the circuit breaker 12 to be controlled via the network NT to control one of the multiple circuit breakers 12 installed in the power system 10 to open, based on measurement data collected by the data acquisition unit 231, without using information from the protective relay 13.

[0035] For example, when the control unit 233 transmits the above command to the circuit breaker 12 to be controlled among the multiple circuit breakers 12, it transmits the command according to a predetermined order of the circuit breakers 12. The setting information for the order of the circuit breakers 12 to which the command is transmitted is stored, for example, in the control information storage unit 234, and the control unit 233 transmits the above command by referring to the setting information stored in the control information storage unit 234.

[0036] Here, with reference to Figure 5, an example of setting the order of the circuit breakers 12 that transmit commands will be explained. Figure 5 is a schematic diagram showing an example of multiple circuit breakers 12 installed on a transmission line 11 in a power system 10 according to this embodiment. In the illustrated power system 10, circuit breaker 12a is installed on a transmission line 11 that connects to other systems. The control unit 233 is first set to send a command to open circuit breaker 12a so as not to affect other systems. Next, the control unit 233 is set to send commands to open circuit breakers 12b-1, 12b-2, 12b-3, ..., 12b-10 in that order.

[0037] The control unit 233 transmits commands to the circuit breakers 12 in the order described above, causing the circuit breakers 12b to trip sequentially. When the measured value falls within the threshold, the faulty section is disconnected, and the control unit detects that the fault has been resolved. It is then determined that the circuit breaker 12 that tripped when the fault was resolved was the circuit breaker 12 that needed to be tripped to disconnect the faulty section.

[0038] For example, after detecting an anomaly in the power system 10, the anomaly detection unit 232 determines that the measured value has returned to within the threshold range if the measured value remains below a preset threshold for a predetermined period of time or longer, based on the measurement data collected by the data acquisition unit 231, and detects that the anomaly in the power system 10 has been resolved.

[0039] When the abnormality detection unit 232 detects that the abnormality in the power system 10 has been resolved, the control unit 233 terminates the process of sending a command to open the circuit breakers 12. Then, the control unit 233 controls the circuit breakers 12 that were controlled to be open, excluding at least the circuit breaker 12 that resolved the abnormality in the power system 10. In other words, the control unit 233 sequentially opens the circuit breakers 12, and as a result, returns the circuit breakers 12 that were controlled to be open back to their original state (closed), except for the circuit breaker 12 that needed to be interrupted in order to isolate the abnormal area.

[0040] Note that the order of the circuit breakers 12 that transmit the commands, as explained with reference to Figure 5, is just one example and is not limited to this order; it can be set arbitrarily.

[0041] Next, referring to Figure 6, the operation of the circuit breaker control process will be described, in which the system monitoring and control system 20 (monitoring and control server 23) controls the circuit breaker 12 by collecting measurement data from the measuring instrument 15 from the power system 10 without using information from the protective relay 13.

[0042] Figure 6 is a flowchart showing an example of the circuit breaker control process according to this embodiment. (Step S101) The monitoring and control server 23 collects measurement data, including measured values ​​(voltage values, current values, etc.) measured by each of the multiple measuring instruments 15 installed at various locations in the power system 10, via the network NT. Then, the process proceeds to step S103.

[0043] (Step S103) Based on the measurement data collected in step S101, the monitoring and control server 23 determines whether the measured value measured by each of the multiple measuring instruments 15 exceeds a preset threshold. For example, if the state in which the measured value is above the preset threshold continues for a predetermined time or longer, the monitoring and control server 23 determines that the threshold has been exceeded (Step S103: YES) and proceeds to step S105. On the other hand, if the monitoring and control server 23 determines that the measured value has not exceeded the preset threshold (Step S103: NO), it terminates the process.

[0044] (Step S105) The monitoring and control server 23 sends a command via the network NT to open the circuit breakers 12 according to the pre-configured order of the circuit breakers 12. In the first process after determining YES in step S103, it sends a command to open the first configured circuit breaker 12. Then, the process proceeds to step S107.

[0045] (Step S107) The monitoring and control server 23 measures the time between sending a command to the circuit breaker 12 in step S105 and sending another command to the circuit breaker 12. Then, it proceeds to step S109.

[0046] (Step S109) The monitoring and control server 23 determines whether the specified time has elapsed. If the monitoring and control server 23 determines that the specified time has elapsed (Step S109: YES), it returns to Step S105 and sends a command to open the next circuit breaker 12 in the sequence. On the other hand, if the monitoring and control server 23 determines that the specified time has not elapsed (Step S109: NO), it proceeds to Step S121.

[0047] (Step S121) The monitoring and control server 23 acquires the measurement data from the measuring instrument 15 after controlling the circuit breaker 12 to open in step S105, and makes a termination determination based on the measurement value. For example, if the monitoring and control server 23 determines that the measurement value is within a preset threshold (step S121: YES), it terminates the process, considering the abnormal location to be isolated. At this time, before terminating the process, the monitoring and control server 23 closes the circuit breakers 12 that were controlled to be open, except for the circuit breaker 12 that needed to be shut off in order to isolate the abnormal location. On the other hand, if the monitoring and control server 23 determines that the measurement value is not within a preset threshold (step S121: NO), it returns to step S107 and continues measuring the time.

[0048] [Hardware configuration] Here, we will describe the hardware configuration of the system monitoring and control system 20, including the online linkage server 22, monitoring and control server 23, and projector server 24. These servers have a hardware configuration as a computer system.

[0049] Figure 7 is a schematic block diagram showing an example of the hardware configuration according to this embodiment. For example, the online collaboration server 22, the monitoring and control server 23, and the projector server 24 comprise some or all of the components of the computer 100 shown in the figure.

[0050] The computer 100 has a hardware configuration that includes a CPU (Central Processing Unit) 101, RAM (Random Access Memory) 102, ROM (Read Only Memory) 103, storage device 104, communication unit 105, input unit 106, and output unit 107.

[0051] The CPU 101 is a processor that performs various processes by executing programs stored in the ROM 103 or the storage device 104.

[0052] RAM102 is used as a reading area for programs executed by CPU101, or as a work area for writing data used for processing by said programs.

[0053] ROM103 consists of electrically rewritable non-volatile memory, such as EEPROM (Electrically Erasable Programmable Read Only Memory) or flash ROM. For example, ROM103 stores at least a portion of the system program and programs that execute various processes.

[0054] The storage device 104 is comprised of an HDD (Hard Disk Drive), an SSD (Solid State Drive), and the like. For example, the storage device 104 may store at least a portion of system programs and programs that perform various processes. The storage device 104 may also store various data and the aforementioned digital certificates.

[0055] The communication unit 105 connects to the network NT via a wireless LAN (Local Area Network) or wired LAN to perform data communication with other electronic devices. The communication unit 105 may also be equipped with short-range wireless communication such as Bluetooth (registered trademark) or interfaces such as USB (Universal Serial Bus) to perform data communication with peripheral devices.

[0056] The input unit 106 includes input devices such as a keyboard, touchpad, touch panel, and microphone. The output unit 107 includes display units such as liquid crystal displays and organic EL displays, and output devices such as speakers.

[0057] As described above, the monitoring and control server 23 (an example of a power system monitoring and control device) according to this embodiment collects measurement data, including measured values ​​(voltage values, current values, etc.) measured by each of the multiple measuring instruments 15 installed at various locations in the power system 10, via the network NT (an example of a communication line). The monitoring and control server 23 then transmits a command (control information) to the circuit breaker 12 to be controlled via the network NT, based on the collected measurement data, to open one of the multiple circuit breakers 12 installed in the power system 10, without using information from the protective relay 13, regardless of whether a protective relay 13 is installed in the power system 10.

[0058] As a result, the monitoring and control server 23 controls the opening of the circuit breaker 12 by simulating the function of the protective relay 13 without using information from the protective relay 13, making it possible to configure the power system 10 without installing the protective relay 13. Therefore, the monitoring and control server 23 can reduce maintenance costs associated with the periodic maintenance and replacement of the protective relay 13. In addition, it can also reduce costs by eliminating the need to install the protective relay 13 in the power system 10.

[0059] For example, the monitoring and control server 23 detects abnormalities in the power system 10 by determining whether the measured values ​​measured by each of the multiple measuring instruments 15, based on measurement data collected from multiple measuring instruments 15 installed in various locations in the power system 10, have exceeded a preset threshold. If an abnormality is detected, the monitoring and control server 23 transmits the above command (control information) to the circuit breaker 12 to be controlled among the multiple circuit breakers 12.

[0060] As a result, the monitoring and control server 23 controls the opening of the circuit breaker 12 by detecting abnormalities in the power system 10 based on measurement data collected from the measuring instrument 15, making it possible to configure the power system 10 without installing a protective relay 13. Therefore, the monitoring and control server 23 can reduce maintenance costs associated with the periodic maintenance and replacement of the protective relay 13. In addition, it can also reduce costs by eliminating the need to install a protective relay 13 in the power system 10.

[0061] Furthermore, when the monitoring and control server 23 transmits the above command (control information) to the circuit breaker 12 to be controlled among the multiple circuit breakers 12, it transmits it according to the pre-configured order of the circuit breakers 12.

[0062] As a result, when an abnormality occurs in the power system 10, the monitoring and control server 23 can shut off the abnormality (fault section) by opening the circuit breakers 12 in a predetermined order, even if the location of the abnormality (fault section) cannot be identified.

[0063] Furthermore, after detecting an abnormality in the power system 10, the monitoring and control server 23 detects whether or not the abnormality in the power system 10 has been resolved based on measurement data collected from multiple measuring instruments 15 installed at various locations in the power system 10. If the monitoring and control server 23 detects that the abnormality in the power system 10 has been resolved, it performs control to close (close) the circuit breakers 12 that were controlled to be open, excluding at least the circuit breaker 12 that resolved the abnormality in the power system 10.

[0064] As a result, if an abnormality occurs in the power system 10, the monitoring and control server 23 can shut off the abnormal section (fault section) and then restore power to the system that is not affected by the abnormal section (fault section) by closing the circuit breaker 12.

[0065] Furthermore, the power system monitoring system 1 according to this embodiment includes a plurality of measuring instruments 15 installed at various locations in the power system 10, a plurality of circuit breakers 12 installed at various locations in the power system 10, and a monitoring and control server 23 (an example of a power system monitoring and control device). The monitoring and control server 23 collects measurement data, including measured values ​​(voltage values, current values, etc.) measured by each of the plurality of measuring instruments 15, via a network NT (an example of a communication line). In addition, regardless of whether or not a protective relay 13 (protective relay) is installed in the power system 10, the monitoring and control server 23 transmits a command (control information) to the circuit breaker 12 to be controlled via the network NT, based on the collected measurement data, to control one of the plurality of circuit breakers 12 installed in the power system 10 to open, without using information from the protective relay 13.

[0066] As a result, the power system monitoring system 1 controls the opening of the circuit breaker 12 by simulating the function of the protective relay 13 without using information from the protective relay 13, making it possible to configure the power system 10 without installing the protective relay 13. Therefore, the power system monitoring system 1 can reduce maintenance costs associated with the periodic maintenance and replacement of the protective relay 13. In addition, it can also reduce costs by eliminating the need to install the protective relay 13 in the power system 10.

[0067] Furthermore, the control method in the monitoring and control server 23 (an example of a power system monitoring and control device) according to this embodiment includes the steps of: the data acquisition unit 231 collecting measurement data, including measured values ​​(voltage values, current values, etc.) measured by each of the multiple measuring instruments 15 installed at various locations in the power system 10, via a network NT (an example of a communication line); and the control unit 233 transmitting a command (control information) to the circuit breaker 12 to be controlled via the network NT, based on the collected measurement data, to control one of the multiple circuit breakers 12 installed in the power system 10 to open, without using information from the protective relay 13, regardless of whether or not a protective relay 13 is installed in the power system 10.

[0068] As a result, the control method in the monitoring and control server 23 controls the opening of the circuit breaker 12 by simulating the function of the protective relay 13 without using information from the protective relay 13, making it possible to configure the power system 10 without installing the protective relay 13. Therefore, the control method in the monitoring and control server 23 can reduce maintenance costs associated with periodic maintenance and replacement of the protective relay 13. In addition, the costs associated with not installing the protective relay 13 in the power system 10 can also be reduced.

[0069] Furthermore, the measurement data collected from the measuring instrument 15 is not limited to voltage values, current values, etc., but may also include, for example, the direction and frequency of the current. In other words, the direction and frequency of the current may be used in the determination when sending a command to control the circuit breaker 12 to open.

[0070] Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and the embodiments of this disclosure can be modified or omitted as appropriate.

[0071] For example, as described with reference to Figure 5 in the above embodiment, the control unit 233 transmits a command (control information) to open one of the multiple circuit breakers 12 to be controlled, in accordance with a predetermined order of the circuit breakers 12. However, it is not limited to this. For example, the control unit 233 may determine the order of the circuit breakers when transmitting the command to the circuit breaker 12 to be controlled among the multiple circuit breakers 12 based on measurement data collected by the data acquisition unit 231.

[0072] As a result, when an anomaly occurs in the power system 10, even if the location of the anomaly (fault section) cannot be identified, the monitoring and control server 23 can open the circuit breakers 12 according to the priority order based on the measurement data, thereby increasing the likelihood of shutting off the anomaly (fault section) more quickly. Here, the priority order based on the measurement data is, for example, the order in which the circuit breakers 12 are judged to have a high correlation with the anomaly (fault section) based on the measurement values ​​of the measuring instruments 15 at each location.

[0073] Furthermore, the control unit 233 may change the number of circuit breakers 12 to be controlled among the multiple circuit breakers 12 based on the measurement data collected by the data acquisition unit 231.

[0074] As a result, when an abnormality occurs in the power system 10, the monitoring and control server 23 can narrow down the circuit breakers 12 that it determines to have a high correlation with the abnormal location (fault section) based on the measured values ​​of the measuring instruments 15 at each location, and open the circuit breakers 12, thereby increasing the likelihood of shutting off the abnormal location (fault section) more quickly.

[0075] Furthermore, the control unit 233 may change the range of circuit breakers 12 to be controlled from among the multiple circuit breakers 12 based on the measurement data collected by the data acquisition unit 231. For example, since the control unit 233 can collect multiple measurement data in the power system 10 using the data acquisition unit 231, the accuracy of identifying abnormal locations (fault sections) is improved compared to the conventional method in which each protective relay 13 determines abnormalities individually, and it becomes possible to limit the range in the power system 10 that is highly related to abnormal locations (fault sections).

[0076] As a result, when an abnormality occurs in the power system 10, the monitoring and control server 23 can sequentially open only the circuit breakers 12 that it determines to have a high correlation with the abnormal location (fault section) based on the measured values ​​of the measuring instruments 15 at each location, thereby increasing the likelihood of shutting off the abnormal location (fault section) more quickly. In addition, the monitoring and control server 23 can refrain from opening circuit breakers 12 that it determines to have a low correlation with the abnormal location (fault section), thereby suppressing unnecessary power outages.

[0077] Furthermore, if an abnormality occurs in the power system 10, the load conditions and other factors may change during the process of sequentially opening multiple circuit breakers 12, which could alter the criteria for determining an abnormality. Therefore, the abnormality detection unit 232 may change the threshold used for determining an abnormality in the power system 10 when one or more of the circuit breakers 12 are opened based on the command transmitted by the control unit 233.

[0078] As a result, when the status of the power system 10 changes due to the opening of the circuit breaker 12, the monitoring and control server 23 changes the conditions for determining an anomaly in accordance with that change, thereby enabling it to detect anomalies in the power system 10 more appropriately. In addition, by acquiring measurement data from the measuring instrument 15 at a high frequency, the monitoring and control server 23 can perform optimized control of the circuit breaker 12 compared to the conventional method using the protective relay 13.

[0079] Furthermore, even if the measured values ​​measured by each of the multiple measuring instruments 15 do not exceed the threshold, the abnormality detection unit 232 may detect signs of an abnormality in the power system 10 if it determines, based on the measurement data collected by the data acquisition unit 231, that there are signs of an abnormality in the power system 10. Then, if the abnormality detection unit 232 detects signs of an abnormality, the control unit 233 may transmit the above command to the control device 12 among the multiple circuit breakers 12 that is to be controlled.

[0080] As a result, the monitoring and control server 23 controls the opening of the circuit breaker 12 when there are signs of an abnormality in the power system 10, thereby preventing the occurrence of an abnormality (accident).

[0081] For example, even if the measured values ​​measured by each of the multiple measuring instruments 15 do not exceed the threshold, the anomaly detection unit 232 may detect signs of an impending anomaly in the power system 10 if it determines, based on the measurement data collected by the data acquisition unit 231, that there are signs of an anomaly in the power system 10. Furthermore, if the anomaly detection unit 232 detects signs of an anomaly, the data acquisition unit 231 may shorten the time interval for collecting measurement data.

[0082] As a result, when the monitoring and control server 23 detects signs of an anomaly in the power system 10, it collects measurement data from the measuring instrument 15 at a faster rate, thereby increasing the frequency of detecting an anomaly and enabling it to shut off the anomaly (fault section) more quickly if an anomaly occurs.

[0083] Furthermore, during the transition phase to software-based protection relays 13 in the power system 10, there may be a mix of locations where the protection relays 13 installed in the power system 10 were removed and replaced with software-based protection relays, and locations where new protection relays were installed in a software-based state (originally removed). Therefore, the monitoring and control server 23 manages these separately within the power system monitoring system 1 to prevent mixing of hardware-controlled abnormality (accident) detection using the protection relays 13 and software-controlled abnormality (accident) detection without using the protection relays 13. For example, the monitoring and control server 23 manages hardware-controlled abnormality (accident) detection and software-controlled abnormality (accident) detection by distinguishing their types using management numbers.

[0084] Furthermore, in response to abnormalities such as the interruption of communication with the monitoring and control server 23 (or each server of the power system monitoring and control system 20), the monitoring and control server 23 constantly monitors whether there are any problems with the communication status with equipment installed at various locations in the power system 10. For example, the power system monitoring and control system 20 has a redundant communication route and redundant servers, and if a communication problem occurs, the monitoring and control server 23 will, depending on the situation, shift one of the redundant communication routes or switch servers.

[0085] As mentioned above, each server in the system monitoring and control system 20 has an internal computer system. Programs for realizing the functions of each configuration of each server in the system monitoring and control system 20 may be recorded on a computer-readable recording medium, and the programs recorded on this medium may be loaded into the computer system and executed to perform the processing in each configuration of each server. Here, "loading and executing the programs recorded on the recording medium into the computer system" includes installing the programs into the computer system. Here, "computer system" includes hardware such as the OS and peripheral devices. Furthermore, "computer system" may include multiple computer devices connected via a network including communication lines such as the Internet, WAN, LAN, and dedicated lines. Also, "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into the computer system. Thus, the recording medium storing the program may be a non-transient recording medium such as a CD-ROM.

[0086] Furthermore, the recording medium also includes internal or external recording media accessible from the distribution server for distributing the program. The program may be divided into multiple parts, downloaded at different times, and then combined in the configurations of each server in the system monitoring and control system 20, or each divided program may be distributed by a different distribution server. Additionally, "computer-readable recording media" includes volatile memory (RAM) within computer systems that act as servers or clients when a program is transmitted over a network, which retains the program for a certain period of time. Moreover, the program may be intended to implement only a portion of the functions described above. Furthermore, the program may be a so-called differential file (differential program) that can implement the functions described above in combination with a program already recorded in the computer system.

[0087] Furthermore, some or all of the functions of each server in the system monitoring and control system 20 in the above-described embodiment may be implemented as integrated circuits such as LSIs (Large Scale Integrations). Each function may be individually processorized, or some or all of them may be integrated into a single processor. In addition, the method of implementing integrated circuits is not limited to LSIs; dedicated circuits or general-purpose processors may also be used. Furthermore, if an integrated circuit technology that can replace LSIs emerges due to advances in semiconductor technology, integrated circuits using that technology may be used. [Explanation of Symbols]

[0088] 1. Power grid monitoring system 10 Power system 11 Power transmission lines 12 Circuit breakers 13. Protective relay 15 Measuring Instruments 20-system monitoring and control system 21 TC 22 Online Integration Server 23 Monitoring and Control Server 24 Projector Servers 25 operational bases 231 Data Collection Unit 232 Anomaly detection unit 233 Control Unit 234 Control Information Storage Unit

Claims

1. A data acquisition unit collects measurement data, including measurement values ​​measured by multiple measuring instruments installed at various points in the power system, via a communication line. Regardless of whether a protective relay is provided in the power system, a control unit transmits control information to the circuit breaker to be controlled via the communication line, based on measurement data collected by the data acquisition unit, to control one of the multiple circuit breakers provided in the power system to open, without using information from the protective relay. A power system monitoring and control device equipped with the following:

2. The power system is further equipped with an anomaly detection unit that detects an anomaly by determining whether the measured value measured by each of the multiple measuring instruments exceeds a preset threshold, based on the measurement data collected by the data acquisition unit. The control unit, When an abnormality is detected by the abnormality detection unit, the control information is transmitted to the circuit breaker to be controlled among the plurality of circuit breakers. The power system monitoring and control device according to claim 1.

3. The control unit, When transmitting the control information to the circuit breaker to be controlled among the multiple circuit breakers, the control information is transmitted according to a predetermined order of the circuit breakers. The power system monitoring and control device according to claim 1.

4. The control unit, The order in which the control information is transmitted to the circuit breaker to be controlled among the multiple circuit breakers is determined based on the measurement data collected by the data acquisition unit. The power system monitoring and control device according to claim 1.

5. The control unit, Based on the measurement data collected by the data acquisition unit, the number of circuit breakers to be controlled among the multiple circuit breakers is changed. The power system monitoring and control device according to claim 1.

6. The control unit, Based on the measurement data collected by the data acquisition unit, the range of circuit breakers to be controlled among the multiple circuit breakers is changed. The power system monitoring and control device according to claim 1.

7. The abnormality detection unit, If one or more of the circuit breakers are opened based on the control information transmitted by the control unit, the threshold value is changed. The power system monitoring and control device according to claim 2.

8. The abnormality detection unit, Even if the measured values ​​measured by each of the multiple measuring instruments do not exceed the threshold, if the data acquisition unit determines, based on the measurement data collected, that there is a sign that the power system is about to become abnormal, the unit detects the sign of an abnormality in the power system. The control unit, When the abnormality detection unit detects an indication of an abnormality, it transmits the control information to the circuit breaker to be controlled among the plurality of circuit breakers. The power system monitoring and control device according to claim 2.

9. The abnormality detection unit, Even if the measured values ​​measured by each of the multiple measuring instruments do not exceed the threshold, if the data acquisition unit determines, based on the measurement data collected, that there is a sign that the power system is about to become abnormal, the unit detects the sign of an abnormality in the power system. The aforementioned data acquisition unit, If the anomaly detection unit detects an indication of an anomaly, the time interval for collecting the measurement data is shortened. The power system monitoring and control device according to claim 2.

10. The abnormality detection unit, After detecting an abnormality in the power system, the system detects whether or not the abnormality in the power system has been resolved based on the measurement data collected by the data acquisition unit. The control unit, When the abnormality detection unit detects that the abnormality in the power system has been resolved, the control unit closes the circuit breakers that were controlled to be open, excluding at least the circuit breaker whose abnormality in the power system has been resolved. The power system monitoring and control device according to claim 2.

11. A control method in a power system monitoring and control device, The data collection unit collects measurement data, including measurement values ​​measured by each of several measuring instruments installed at various locations in the power system, via a communication line. The control unit transmits control information to the circuit breaker to be controlled via the communication line, based on measurement data collected by the data acquisition unit, to control one of the multiple circuit breakers installed in the power system to open, regardless of whether a protective relay is installed in the power system or not, without using information from the protective relay. A control method including

12. Multiple measuring instruments installed at various points in the power system, Multiple circuit breakers are installed at various points in the aforementioned power system, A power system monitoring and control device comprising: a data acquisition unit that collects measurement data including measured values ​​measured by each of the multiple measuring instruments via a communication line; and a control unit that transmits control information to the circuit breaker to be controlled via the communication line, based on the measurement data collected by the data acquisition unit, to control one of the multiple circuit breakers to be opened, without using information from the protective relay, regardless of whether or not a protective relay is provided in the power system; A power grid monitoring system equipped with the following features.

13. A computer as a power system monitoring and control device, The steps include: collecting measurement data, including measured values ​​from multiple measuring instruments installed at various points in the power system, via a communication line; Regardless of whether a protective relay is provided in the power system, without using information from the protective relay, the step of transmitting control information to the circuit breaker to be controlled via the communication line, based on the collected measurement data, to control one of the multiple circuit breakers provided in the power system to open, A program to execute.

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