Power system planning device, power system planning method and power system protection control system

Abstract

To allow construction and timely arrangement of a protection program securing reliability on both sides of a system and power, coping with change inside and outside a power system.SOLUTION: A power system planning device detects change of a state of a power system, specifies an alternative protection control module for alleviating an impact of the detected change, evaluates reliability of the power system when the specified alternative protection control module is used, determines whether to use the specified alternative protection control module on the basis of a result obtained by evaluating the reliability of the power system, and outputs an instruction for executing control by using the specified alternative protection control module when it is determined to use the specified alternative protection control module.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power system planning device, a power system planning method, and a power system protection and control system, which are suitable for application to, for example, a power system. [Background technology]

[0002] Conventionally, the entire equipment that produces and consumes electricity, such as power generation equipment, power transmission equipment, substation equipment, power distribution equipment, and consumer equipment (hereinafter referred to as "power system"), is known. In order to maintain a high-quality power supply in the power system, upper systems that handle wide-area coordinated operations such as central control stations and lower systems that monitor and control devices such as substations work in cooperation with each other. Power system operators use these systems to maintain power quality in the long and short term, and to operate efficiently, even in the event of an accident, for example.

[0003] Substations monitor the status of their equipment and perform operations such as opening and closing circuit breakers, and also provide protective functions to maintain the reliability of electricity by isolating the abnormal part from the power system in the event of a breakdown or abnormality in power system equipment and preventing the accident from spreading. An example of this is a protective relay that isolates the target equipment when the equipment's current or voltage is excessive. In recent years, an international standard (IEC61850) for data transmission for such substation equipment has been established, and the use of standard-compliant equipment called intelligent electronic devices (IEDs) has made it possible to configure the system with a certain degree of flexibility.

[0004] For example, JP 2013-164731 A (Patent Document 1) discloses a technology for automatically recognizing changes that occur when an IED is newly installed or when a line is amplified in a substation automation system based on these standards. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-164731 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, although progress has been made in facilitating changes to substation equipment through IEDs and the technology described in Patent Document 1, it has been difficult to adaptively change processing content in response to major changes in the state of the power system. Conventionally, protection and control devices such as sensors and circuit breakers have been installed, connected, and configured to operate so that protective functions necessary to maintain reliability are activated based on the long-term operational track record of the power system, but this can make it difficult to respond to unpredictable situations such as the large-scale introduction of renewable energy sources that are highly dependent on weather conditions, or the occurrence of large-scale disasters.

[0007] In addition, conventional protective relays and IEDs are generally implemented as embedded devices with a certain degree of fixed processing, and it can be difficult to accommodate the addition or updating of new sensors or updates to protection and control functions that were not anticipated when the system was built.

[0008] The present invention has been made in consideration of the above points, and proposes a power system protection and control system that enables adaptive updates to protection and control devices and systems in substations, etc., while ensuring the reliability of power and the system, even when various changes in conditions occur in the power system, such as changes to sensor devices due to failures or updates, changes to the processing of protection devices, the addition of renewable energy sources, and changes in power generation conditions. [Means for solving the problem]

[0009] In order to solve such problems, for example, the configuration described in the claims is adopted. For example, one aspect of the present invention is a power system planning device, in which a power system has a plurality of electric devices that change a state of power flow in the power system and a plurality of measuring devices that measure a state of the power system, a power system protection control device is connected to the power system, the power system planning device has a processing unit and a recording unit, the recording unit records equipment state data including states of the plurality of electric devices, equipment configuration data including parameter values ​​of the plurality of electric devices, a change in the state of the power system, and among protection control modules for controlling the power system by being executed by the power system protection control device, a protection control module that is affected by the change and a protection control module that is affected by the change and that is used to mitigate an effect of the change by replacing the protection control module that is affected by the change. and change detection data associating the alternative protection and control module with an alternative protection and control module that is a protection module for controlling a power system, the processing unit detects a change in a state of the power system, identifies the alternative protection and control module for mitigating an effect of the detected change based on the change detection data, evaluates reliability of the power system in a case where the power system protection control device uses the identified alternative protection and control module based on the equipment state data and the equipment configuration data, determines whether to use the identified alternative protection and control module based on a result of evaluating the reliability of the power system, and when it is determined that the identified alternative protection and control module is to be used, outputs an instruction to the power system protection control device to execute control using the identified alternative protection and control module. Effect of the Invention

[0010] According to one aspect of the present invention, in a power system, even when various changes in conditions occur, such as changes in sensor devices due to failures or updates, changes in the processing of protective devices, the addition of renewable energy sources, or changes in power generation conditions, it is possible to adaptively update protection and control devices and systems at substations and the like while ensuring the reliability of power and the system.

[0011] Other objects, configurations and advantages than those mentioned above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a configuration of a power system protection and control system according to an embodiment of the present invention; [Diagram 2] FIG. 4 is an explanatory diagram showing an example of state measurement data at a specific measurement point in the embodiment of the present invention. [Diagram 3] FIG. 4 is an explanatory diagram illustrating an example of device setting data of an electrical device according to an embodiment of the present invention. [Figure 4] FIG. 4 is an explanatory diagram illustrating an example of device status data of an electric device according to an embodiment of the present invention. [Diagram 5] FIG. 2 is an explanatory diagram illustrating an example of device configuration data for a power transmission line of a power system according to an embodiment of the present invention. [Figure 6] FIG. 4 is an explanatory diagram illustrating an example of system configuration data according to the embodiment of the present invention. [Figure 7] FIG. 11 is an explanatory diagram illustrating an example of change detection data according to the embodiment of the present invention. [Figure 8] FIG. 4 is an explanatory diagram illustrating an example of processing configuration data according to the embodiment of the present invention. [Figure 9] FIG. 11 is an explanatory diagram illustrating an example of processing evaluation data according to the embodiment of the present invention. [Figure 10] 4 is a flowchart showing an example of a process for adaptively changing a protection control module in response to a change in a power system state in an embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory diagram showing an example of a motion detection display screen in the embodiment of the present invention. [Figure 12] FIG. 11 is an explanatory diagram showing an example of a processing configuration display screen in the embodiment of the present invention. [Figure 13] FIG. 13 is an explanatory diagram showing an example of a processing evaluation display screen in the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the present invention will be described in detail below with reference to the drawings.

[0014] FIG. 1 is a block diagram showing a configuration of a power system protection and control system according to an embodiment of the present invention.

[0015] The power system protection and control system 1 includes a power system planning device 2, a power system protection and control device 5, and a power system electrical device 6. The power system planning device 2 and the power system protection and control device 5 are communicatively connected via a first communication network 3, and the power system protection and control device 5 and the power system electrical device 6 are communicatively connected via a second communication network 4.

[0016] The power system planning device 2 and the power system protection control device 5 are, for example, a circuit, a printed circuit board, a server, or an information processing device that includes a controller such as a CPU (Central Processing Unit) or a microprocessor, a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), and a communication device.

[0017] The power system planning device 2 includes a processing unit 10 that performs various types of processing, a recording unit 20 that records (stores) various types of information, a communication unit 31 that communicates via the first communication network 3, an input unit 32 that inputs various types of information, and a display unit 33 that outputs various types of information.

[0018] The power system protection controller 5 includes a management unit 501 that manages the configuration of the protection control module, a communication unit 502 that communicates via the first communication network 3, and a protection control module 50 that performs protection control processing. The power system protection controller 5 holds one or more specific processing contents of acquisition and processing of measurement data, operation of electrical equipment, and setting change as the protection control module 50, and the management unit 501 can select a module that actually executes the processing. The power system protection controller 5 can be realized so that the protection control module is replaceable by known technology such as a virtual machine or a container, but may also be realized using other methods.

[0019] The protection and control module 50 includes a module processing unit 551 that executes processing of protection and control operations for the power system electric devices 6, a module recording unit 552 that records the contents of the processing, and a module communication unit 553 that communicates with the power system electric devices via the second communication network 4. In response to an instruction from the module processing unit 551, measurement data can be acquired from the measuring device 601 via the second communication network 4 connected to the module communication unit 553, and stored in the module recording unit 552.

[0020] The module processing unit 551 can determine the operation content for the electric device 602 by using the measurement data in the module recording unit 552 and other setting data. The module communication unit 553 can transmit operation data including the operation content determined by the module processing unit 551 to the electric device 602 via the second communication network 4 and change the setting. This is one example, and the processing of the protection and control module 50 may be various processing for improving the protection and control of the power system, which is a combination of information transmission to the power system planning device 2 via the communication unit 502, holding of measurement data from the measuring device 601, operation of the electric device 602, and other useful processing.

[0021] The processing unit 10, the management unit 501, and the module processing unit 551 may be realized by software in which the controller performs processing according to various programs stored in a storage device, or may be realized by hardware such as a circuit. In addition, these are not limited to being realized by a single device, but may be realized by multiple devices connected to each other so as to be able to communicate with each other. The recording unit 20 and the module recording unit 552 are realized by a storage device. The communication units 31, 502, and the module communication unit 553 are realized by a communication device. The input unit 32 is a pointing device such as a keyboard or a mouse, a touch panel, a voice instruction device, etc., and is realized by including at least one of them. The display unit 33 is a display device, a printer, a voice output device, etc., and is realized by including at least one of them.

[0022] The power system electrical equipment 6 includes electrical equipment 602 such as power generation equipment (e.g., a power plant) that generates electricity using a power generation device, customer equipment that consumes the electricity generated by the power generation equipment, power distribution equipment (power transmission equipment, substation equipment, distribution equipment, etc.) that transmits electricity from the power generation equipment to the customer equipment, or protective control equipment (e.g., a protective relay) for protecting and appropriately controlling the equipment, and measuring equipment 601 that measures the state of these facilities or the state of the surrounding environment.

[0023] The power generation equipment is equipment that generates thermal power, hydroelectric power, nuclear power, geothermal power, solar power, wind power, etc., but may also be equipment that generates power using various other power generation methods. The power distribution equipment includes overhead transmission lines, underground transmission lines, transformers, circuit breakers, switches, phase modifying equipment, and bus bars, but may also include various other equipment related to power transmission and distribution. These are integrated to form a power system.

[0024] The measuring device 601 indicates a plurality of measuring devices that measure the state at a specific measuring point of the power system. The measurement items include power items such as voltage, phase, and power, weather items such as temperature, wind speed, wind direction, precipitation, and solar radiation, items of the setting state and operation state of the electric device 602, items of the operation state of equipment that changes the power flow state such as power distribution equipment and power generation equipment, and various other items can be the measurement items. The measurement points include the busbar of the power generation equipment, the busbar of the substation equipment, the power distribution equipment, the consumer equipment, and the like, and one measuring point may have one or more measuring devices. The value measured by the measuring device 601 is transmitted to the power system protection control device 5 via the second communication network 4. The value measured by the measuring device 601 may be further transmitted to the power system planning device 2 via the first communication network 3. At this time, the measuring device 601 may transmit information on the measurement date and time together with the measured value.

[0025] The processing unit 10 of the power system planning apparatus 2 includes a main processing unit 101, a system state acquisition unit 102, a change detection unit 103, a simulated environment generation unit 104, a power operation evaluation unit 105, a system operation evaluation unit 106, a processing decision unit 107, and a processing application unit 108.

[0026] The system state acquisition unit 102 periodically (e.g., at five-minute intervals) or when instructed by the main processing unit 101 (e.g., at a time desired by the user), acquires various data transmitted by the measuring device 601 via the communication unit 31, and records the data together with the measurement date and time as system state data 201 in the recording unit 20. The data from the measuring device 601 may be acquired from the second communication network 4 via the power system protection and control device 5 through the first communication network 3, or may be acquired through another communication network not shown in FIG. 1 without via the power system protection and control device 5. In addition, a predicted value that predicts a future state, rather than a measured value, may be acquired from an external information source not shown through a network not shown. In this case, the measurement date and time will be a future date.

[0027] The recording unit 20 is realized by a storage device. In this embodiment, the recording unit 20 holds system status data 201, device configuration data 202, system configuration data 203, change detection data 204, processing configuration data 205, and processing evaluation data 206. These will be described in detail later.

[0028] The system status data 201 includes status measurement data 211 , device setting data 212 , and device status data 213 .

[0029] The state measurement data 211 includes information measured by the measuring device 601. The state measurement data 211 includes, for example, power information such as active power, reactive power, voltage, and phase flowing through the electrical device 602, and meteorological information such as temperature and wind speed.

[0030] FIG. 2 is an explanatory diagram showing an example of state measurement data 211 at a specific measurement point in the embodiment of the present invention.

[0031] The state measurement data 211 includes information such as, for example, a serial number D101, date and time D102, temperature D103, active power D104, and reactive power D105. The state measurement data 211 stores values ​​(measurement values) of specific measurement points in chronological order. Note that D102 to D105 are examples of items related to measurement, and are changed as appropriate depending on the measurement point and the measurement target. The temperature D103 is an example of meteorological information, and may further include other meteorological information such as wind speed.

[0032] The device setting data 212 includes information on the setting state of the electrical device 602 .

[0033] FIG. 3 is an explanatory diagram showing an example of the device setting data 212 of the electric device 602 according to the embodiment of the present invention.

[0034] The device setting data 212 includes information such as, for example, a serial number D201, a measurement date and time D202, opening and closing of a circuit breaker B1 D203, opening and closing of a circuit breaker B2 D204, a tap position D205 of a transformer T1, and a tap position D206 of a transformer T2. The device setting data 212 stores information (setting values) indicating the settings of the electric device 602 in chronological order. Note that the opening and closing of a circuit breaker B1 D203 to the tap position D206 of a transformer T2 are examples of items related to the settings of the electric device 602, and a combination of items that can be acquired from the measuring device 601 can be appropriately adopted as the information included in the device setting data 212.

[0035] The device status data 213 includes information (operation status information) indicating the operation status of devices that change the power flow status, such as power distribution facilities and power generation equipment of the electric device 602.

[0036] FIG. 4 is an explanatory diagram showing an example of the device status data 213 of the electric device 602 according to the embodiment of the present invention.

[0037] 4, the equipment status data 213 includes information such as a serial number D301, a measurement date and time D302, an operation state D303 of a circuit breaker B1, an operation state D304 of a circuit breaker B2, an operation state D305 of a transformer T1, and an operation state D306 of a transformer T2. The equipment status data 213 stores operation state information of the electric equipment 602 in chronological order. The operation state D303 of the circuit breaker B1 to the operation state D306 of the transformer T2 may include similar items related to the electric equipment 602, such as the open / closed state of switchgear such as a circuit breaker and a switchgear, and the power transmission status of a power transmission line. The items of the equipment status data 213 may also include a combination of items of operation states of equipment that change the power flow state, such as power distribution equipment and power generation equipment, and items of operation states of other equipment acquired from the measuring equipment 601.

[0038] The device configuration data 202 is recorded in advance in the recording unit 20, and includes information relating to the electrical circuit aspects of the measuring devices 601 and electrical devices 602 that constitute the power system.

[0039] FIG. 5 is an explanatory diagram showing an example of the device configuration data 202 for a power transmission line of a power system according to an embodiment of the present invention.

[0040] The equipment configuration data 202 includes information such as ID D401, name D402, rated voltage D403, reference capacitance D404, line length D405, resistance D406, and reactance D407, and is stored for each power transmission line. The equipment configuration data 202 includes information necessary for electrical circuit analysis of the power system, such as electrical characteristics of the electrical equipment 602, operational conditions such as transmission capacity and voltage range, electrical connection forms between the equipment, and protection control functions such as overload protection. The equipment configuration data 202 also includes information related to measurements by sensors in the power system, such as the measurement target and measurement conditions for the measuring equipment 601, and information on the electrical connection forms of the equipment.

[0041] 5 shows the case of a power transmission line, but other items may be provided for other electrical devices and measuring devices. The information included in the device configuration data 202 is often items that do not change significantly in a short period of time, but may be updated in response to device updates, accidents, or other sudden changes in circumstances.

[0042] The system configuration data 203 is recorded in advance in the recording unit 20, and includes information relating to the information system aspects of the measuring devices 601 and the electrical devices 602 that constitute the power system.

[0043] FIG. 6 is an explanatory diagram showing an example of the system configuration data 203 according to the embodiment of the present invention.

[0044] The system configuration data 203 includes information such as an ID D501, a name D502, an output data type D503, an update frequency D504, a communication network D505, and a communication method D506, and is stored for each device constituting the power system electric device 6.

[0045] The system configuration data 203 includes information necessary for the information system analysis of the power grid, such as information on the configuration of the measuring device 601 as an information system, and information on the configuration of the electrical device 602 as an information system. Examples of the former include communication-related information such as the measurement items of the measuring device 601, the type of communication data, the communication frequency, and the communication connection destination. Examples of the latter include communication-related information such as the processing items of the electrical device 602, the type of communication data, the communication frequency, and the communication connection destination.

[0046] 6 shows information about an electrical measuring device 601 as an example, but different items may be provided for other types of measuring devices 601 or electrical devices 602. The included information is often items that do not change significantly in a short period of time, but may be updated in response to equipment updates, accidents, or other sudden changes in circumstances.

[0047] The change detection data 204 is pre-recorded in the recording unit 20 and includes information for detecting a situation change that requires an update of the protection control module 50 .

[0048] FIG. 7 is an explanatory diagram showing an example of the change detection data 204 according to the embodiment of the present invention.

[0049] The change detection data 204 includes, for example, an ID D601, a detection target D602, a detection method D603, a target of device configuration change D604, an item D605, a value D606, a target of system configuration change D607, an item D608, a value D609, an affected processing configuration D610, and an alternative processing configuration D611, and is stored for each item to be detected.

[0050] In response to changes in the state of the power system specified by the detection target D602 and the detection method D603, changes occurring in the equipment configuration are indicated by the equipment configuration change target D604 as the value D606, and changes occurring in the system configuration are indicated by the system configuration change target D607 as the value D609. Various items are assumed as items to be detected, such as the range of measurement values, the reception status of measurement data, the operation status or setting status of equipment, or the execution status of a protection control module. Furthermore, for example, by specifying a transient analysis or a power flow calculation, instead of a measuring instrument, as the detection target D602 and specifying standards for reliability and stability as the detection method D603, not only direct changes in measured values ​​but also analytical change events may be specified.

[0051] The affected processing configuration D610 includes designation information for the protection control module 50 that realizes a processing configuration that may be affected by the configuration change indicated in the value D609 from the target D604. The alternative processing configuration D611 includes designation information for the protection control module 50 that realizes a processing configuration that may be able to replace the protection control module 50 indicated in the affected processing configuration D610. These are merely examples, and the change detection data 204 may include different items for achieving the same purpose as above.

[0052] Here, a specific example of the change detection data 204 shown in Fig. 7 will be described. In the first row of the change detection data 204 shown in Fig. 7, the detection target D602 and the detection method D603 are "M001" and "Measured temperature is 30 to 40°C", the equipment configuration change target D604, item D605 and value D606 are "Power line A", "Power transmission capacity" and "Recalculation", the system configuration change target D607, item D608 and value D609 are all blank, and the affected processing configuration D610 and alternative processing configuration D611 are "Mo001" and "Mo101", respectively.

[0053] Here, "M001" is an example of identification information of the measuring device 601, and "Mo001" and "Mo101" are examples of identification information of the protection control module 50. In the following description, the measuring device 601 and the protection control module 50 identified by these identification information may be described as the measuring device "M001", the protection control module "Mo001", and the protection control module "Mo101". The same applies to those with other identification information.

[0054] The example of the first line indicates that when a change is detected in the temperature measured by the measuring device "M001" that falls within the range of 30°C to 40°C (for example, when the temperature of the measurement target rises to the range of 30°C to 40°C due to an increase in summer temperature, etc.), the transmission capacity of the transmission line A changes, and using the protection control module "Mo001" will not provide optimal protection, and an undesirable event may occur in the power system (for example, power may be cut off even though there is sufficient margin), and that in that case, using the protection control module "Mo101" instead of the protection control module "Mo001" may provide more optimal control and prevent the occurrence of undesirable events. The value D606 being "recalculated" indicates that when the above temperature change is detected, the transmission capacity of the transmission line A is recalculated using a formula that depends on the changed temperature.

[0055] On the other hand, in the second row of the change detection data 204 shown in FIG. 7, the detection target D602 and detection method D603 are “M002” and “data volume 0”, respectively, the target D604, item D605, and value D606 of the equipment configuration change are all blank, the target D607, item D608, and value D609 of the system configuration change are “output data”, “update frequency”, and “measured value”, respectively, and the affected processing configuration D610 and alternative processing configuration D611 are “Mo002” and “Mo102”, respectively.

[0056] The example in the second line indicates that if a change is detected in which the amount of data output from the measuring device "M002" becomes 0 (for example, if the measuring device "M002" breaks down and becomes unable to measure), the measured value of the update frequency of the output data of the measuring device "M002" will change, and using the protection control module "Mo002" will not be able to perform optimal control, and there is a possibility that undesirable events will occur in the power system, and that in that case, using the protection control module "Mo102" instead of the protection control module "Mo002" will enable more optimal control and prevent the occurrence of undesirable events. Note that the fact that the value D609 is a "measurement value" indicates that if a change in the amount of data described above is detected, the detected amount of data will be used as the amount of data after the change.

[0057] 7, the ID of one protection control module 50 is held as the alternative processing configuration D611 corresponding to one influence processing configuration D610, but the IDs of multiple protection control modules 50 may be held as the alternative processing configuration D611. In that case, as will be described later, any one of the multiple protection control modules 50 may be selected as the protection control module 50 to actually substitute based on a predetermined criterion.

[0058] The processing configuration data 205 is recorded in advance in the recording unit 20 and includes information about the protection control module 50 executed in the power system protection control device 5 .

[0059] FIG. 8 is an explanatory diagram showing an example of the processing configuration data 205 according to the embodiment of the present invention.

[0060] The processing configuration data 205 includes, for example, an ID D701, a name D702, an execution status D703, a processing of the device configuration D704, a target D705, a setting value D706, an execution protection control device D708 of the system configuration, a communication network D709, input data D710, and module data, and is stored for each protection control module.

[0061] The ID D701 includes a management number for identifying the protection control module 50. The name D702 includes a simple expression indicating the processing overview and features of each protection control module 50. The execution state D703 includes information on whether the protection control module 50 is being executed in the power system protection control device 5. When the protection control module 50 is executed, the setting information in the device configuration is included in the setting value D706 from the processing D704 of the device configuration, and the setting information in the system configuration is included in the input data D710 from the execution protection control device D708 of the system configuration.

[0062] For example, it can be seen that the protection control module "Mo001" provides the function of an OLR (overload protection relay) for a specific transmission line of a power circuit through the setting value D706 from the device configuration process D704, and that the information system in which the module is executed is assumed to have an ID of Pc001 as the power system protection control device, network A is the communication network, and the available power is used as input data.

[0063] The protection control module "Mo101" is a module that replaces the protection control module "Mo001." In the example of Fig. 8, the protection control module "Mo001" is running, and the protection control module "Mo101" is stopped.

[0064] On the other hand, it can be seen that the protection and control module "Mo002" provides the function of UFR (Under Frequency Relay) for a specific load in the power circuit through the setting value D706 from the equipment configuration process D704, and it can be seen that the information system in which the module is executed is assumed to be the power system protection and control device with ID Pc002, and that network B is the communication network and uses frequency as input data.

[0065] The protection control module "Mo102" is a module that replaces the protection control module "Mo101." In the example of Fig. 8, the protection control module "Mo101" is running, and the protection control module "Mo102" is stopped.

[0066] These are merely examples, and items may be added, changed, or deleted to achieve the same purpose. The module data D711 also includes binary data of the protection control module 50 executed in the power system protection control device 5.

[0067] The processing evaluation data 206 is recorded in advance in the recording unit 20, and includes information on the results of electrical circuit and system verification of the processing configuration changed upon change detection.

[0068] FIG. 9 is an explanatory diagram showing an example of the processing evaluation data 206 according to the embodiment of the present invention.

[0069] The processing evaluation data 206 includes, for example, a serial number D801, a detection date and time D802, a change detection ID D803, a module before change D804, a module after change D805, a voltage range D806 and a frequency D807 for power evaluation, a processing delay D808 and a communication delay D809 for system evaluation, and is stored each time a change in the protection control module is evaluated by change detection.

[0070] The detection date and time D802 includes the date and time when the change was detected. The change detection ID D803 includes the ID of the change detection data that was the basis of the change detection. The module before change D804 and after change D805 include the IDs of the protection control module 50 before and after the change in relation to the change in the module due to the change detection. The voltage range D806 and frequency D807 of the power evaluation, and the processing delay D808 and communication delay D809 of the system evaluation, respectively include the results of the electrical circuit reliability evaluation and the system reliability evaluation when the changed protection control module 50 is used according to the flowchart described later. These are just examples, and items may be added, changed, or deleted to achieve the same purpose.

[0071] FIG. 10 is a flowchart showing an example of a process for adaptively changing the protection control module 50 in response to a change in the state of the power grid in an embodiment of the present invention.

[0072] The change detection unit 103 periodically or in response to a user instruction acquires the system status data 201 (S101) and determines whether the data satisfies the conditions described in the change detection data 204 (S102). If the data does not satisfy the conditions described in the change detection data 204, the process ends (S102: N). If the data satisfies the conditions described in the change detection data 204 (S102: Y), the simulated environment generation unit 104 acquires the change detection data 204 and extracts information on a configuration change (hereinafter also referred to as a detected change) that satisfies the conditions described in the change detection data 204 from the system status data 201 (S103).

[0073] For example, if it is detected in step S102 that the temperature measured by the measuring device "M001" is within the range of 30° C. to 40° C., then in step S103, information is extracted indicating that the transmission capacity of the power transmission line A is to be recalculated. Alternatively, if it is detected in step S102 that the amount of data measured by the measuring device "M002" is to become 0, then in step S103, information is extracted indicating that the measured value of 0 is to be used as the update frequency of the output data.

[0074] The above is an example of detection of a change in the state of the power system, and detection performed by the change detection unit 103 of this embodiment based on the change detection data 204 is not limited to the above. For example, the change detection unit 103 may detect a change that has occurred in the measurement value up to the present of one of the measuring instruments 601 or other measuring instruments 601 based on the measurement value up to the present by one of the measuring instruments 601. Alternatively, the change detection unit 103 may predict a future measurement value of the measuring instrument 601 or other measuring instruments 601 based on the measurement value up to the present by one of the measuring instruments 601, and detect a change that will occur in the future measurement value. Alternatively, when the change detection unit 103 is able to obtain a predicted future measurement value (for example, from an external system, etc.), it may detect a change based on the future measurement value.

[0075] Alternatively, the change detection unit 103 may detect a change in the measurement value by the measuring device 601 based on information other than the measurement value by the measuring device 601. Furthermore, the change of the detection target may be a change other than the change in the measurement value by the measuring device 601 as long as it is a change in the state of the power system. For example, the change detection unit 103 may detect a current or future analytical change event based on transient analysis or power flow calculation. In any of the above cases, the change detection data 204 includes information that associates the change in the state of the power system detected in the detection target with the protection control module 50 that is affected by the change, and the protection control module 50 (i.e., an alternative module) that replaces it to reduce the impact of the change.

[0076] Next, the simulated environment generating unit 104 acquires the processing configuration data 205 and extracts information on a protection control module 50 (hereinafter also referred to as an alternative module) that substitutes for the currently used protection control module 50 in response to the detected change (S104). Next, the simulated environment generating unit 104 integrates the extracted information on the alternative module with the system state data 201, the device configuration data 202, and the system configuration data 203 to generate a power simulated environment that simulates the electric circuit characteristics when the alternative module is applied to a situation where the detected configuration change occurs, and a system simulated environment that simulates the system characteristics (S105).

[0077] Next, the power operation evaluation unit 105 and the system operation evaluation unit 106 perform power evaluation and system evaluation from the simulated characteristics in the power simulation environment and the system simulation environment, and store the evaluation results in the processing evaluation data 206 (S106).

[0078] Next, the processing decision unit 107 acquires the processing evaluation data 206 and judges whether the replacement module satisfies the applicable condition (S107). If the replacement module satisfies the applicable condition (S107: Y), the processing application unit 108 acquires the module data of the replacement module to be changed from the processing configuration data 205 and instructs the target power system protection control device 5 to replace the module with the replacement module (S108). If the replacement module does not satisfy the applicable condition (S107: N), step S108 is not executed and the module is not replaced.

[0079] In step S108, the process application unit 108 may transmit module data to the protection control device 5 together with an instruction to substitute the protection control module 50, and the protection control device 5 may start control of the power system using the substitute module received. Alternatively, in addition to the module data of the protection control module 50 currently in use, the protection control device 5 may also hold module data of one or more protection control modules 50 that may substitute for it. In that case, in step S108, the process application unit 108 may transmit identification information of the substitute protection control module 50 together with an instruction to substitute the module, and the protection control device 5 may start control of the power system using the protection control module 50 corresponding to the received identification information.

[0080] The power simulation environment simulating the electric circuit characteristics generated by the simulation environment generating unit 104 in step S105 can be generated by, for example, integrating the devices described in the device configuration data 202 to generate an electric circuit, extracting and adding the power generation amount, load amount, device setting status and operation status, etc. from the system state data 201, adding protection and control operations from the device configuration of the running module in the processing configuration data 205, and applying the device configuration change of the detected change detection data and the alternative module device configuration. At this time, the device configuration of the module that is stopped by the substitution is deleted. For these power models, the characteristics of the power flow on the electric circuit can be simulated by, for example, power flow calculation. Furthermore, a model that can simulate more advanced characteristics, such as transient analysis and reproduction of accident conditions, may be constructed.

[0081] The system simulated environment that simulates the information system characteristics generated by the simulated environment generating unit 104 in step S105 can be generated, for example, by integrating the devices described in the system configuration data 203 to generate a system model in which the measuring device 601, the electric device 602, and the power system protection and control device 5 are connected via a communication network, extracting and adding the setting conditions and operation conditions of the devices from the system status data 201, adding the system configuration of the running module in the processing configuration data 205, and applying the system configuration change detected based on the change detection data 204 and the alternative module device configuration corresponding to the detected system configuration change. At this time, the device configuration of the module that is stopped by the substitution is deleted.

[0082] Since multiple system environments distributed in substations and the like within the power grid are assumed, multiple system simulation environments are generated. The system model may be constructed using virtual networks and virtual machines using virtualization technology, but characteristics may also be simulated in the form of the sum of the communication and calculation amounts of individual elements depending on the evaluation items and accuracy.

[0083] In step S106, the power operation evaluation unit 105 uses the generated power model to perform power flow calculations, transient calculations, and the like, and calculates each characteristic value according to the power evaluation items in the processing evaluation data 206. For example, to evaluate whether the bus voltage is outside a specified range, the power flow state of the power model is simulated by power flow calculation, the voltage value of each bus is calculated as a characteristic value, and the evaluation is deemed OK if the voltages of all buses are within the voltage range.

[0084] As an index for these evaluations, as described above, an index for judging whether or not the proposed protection control module 50 is OK if the pre-set conditions are met, and NG if the pre-set conditions are not met may be stored. Alternatively, instead of such an index for judging whether or not the proposed protection control module 50 is OK, a quantitative index such as the number of points where the voltage deviates from the voltage range may be stored. Regarding the latter, for example, when the alternative processing configuration D611 corresponding to the detection change includes multiple protection control modules 50, the power operation evaluation unit 105 may evaluate each of them and select the one with the smallest number of voltage deviation points as the alternative protection control module 50. In addition, an index may be calculated for the existing protection control module in the same manner and compared with other candidates. When the existing plan is selected, it can be interpreted that the existing plan performs the best processing, and therefore no change to the protection control module 50 will occur. These are just examples, and evaluation items may be added, changed, or deleted according to the degree of reliability to be achieved.

[0085] In step S106, the system operation evaluation unit 106 uses the generated system model to simulate the operation of the alternative module and connected devices, and calculates each characteristic value according to the system evaluation items of the processing evaluation data 206. For example, to evaluate whether the calculation time of the processing in the alternative module is within a predetermined delay time, the execution environment of the alternative module is matched to the computing capacity of the power system protection control device, the calculation process from the input of measurement data to the output of control data is simulated, the time until the process is completed is calculated as a characteristic value, and if this time is within the delay time, the evaluation is OK.

[0086] As an index for these evaluations, as described above, an index for judging whether or not the proposed method is OK if the pre-set conditions are met, and NG if the pre-set conditions are not met may be stored. Alternatively, instead of such an index for judging whether or not the proposed method is OK, a quantitative index such as the number of points where the calculated characteristic value deviates from a predetermined range may be stored. Regarding the latter, for example, when the alternative processing configuration D611 corresponding to the detection change includes multiple protection control modules 50, the system operation evaluation unit 106 may evaluate each of them and select the one among them with the smallest number of deviations in the calculated characteristic value as the alternative protection control module 50. In addition, an index may be calculated for the existing protection control module in the same manner and compared with other candidates. When the existing plan is selected, it can be interpreted that the existing plan performs the best processing, and therefore no change will be made to the protection control module 50. These are just examples, and evaluation items may be added, changed, or deleted according to the degree of reliability to be achieved.

[0087] In step S107, the processing determination unit 107 uses the evaluation value generated in step S106 to determine whether the alternative module is applicable. For example, if all of the power evaluation and system evaluation are OK for the relevant data in the processing evaluation data 206, the alternative module is determined to be applicable. As long as reliability can be maintained, it is not necessary for everything to be OK, and other combinations using evaluation values ​​for each item may be used. Also, even if the evaluation value is quantitative, a criterion and weight may be set for each evaluation value, and evaluation may be performed using a combined value of these.

[0088] In step S108, the processing application unit 108 transmits the module data of the module determined to be executable in step S107 (i.e., the binary data corresponding to the module data D711 of the protection control module 50) to the power system protection control device 5 designated as the execution destination of the module, and instructs the execution, thereby changing the module.

[0089] When the management unit 501 of the power system protection control device 5 receives the above module data and its execution instructions from the first communication network 3 via the communication unit 502, it places the received module data as a protection control module 50 and starts executing the protection control module.

[0090] When processing step S104, if multiple alternative processing configurations D611 are specified for one influence processing configuration D610 specified in the change detection data 204, the simulated environment generation unit 104 may generate a power simulated environment and a system simulated environment for each of them. In this case, steps S104 to S106 may be executed in parallel (or sequentially) for each alternative processing configuration, and a quantitative evaluation value may be adopted in step S107 to evaluate multiple configurations in parallel and apply a processing configuration with a better evaluation value among configurations that can ensure reliability.

[0091] The simulated environment generation unit 104 can adaptively select efficient protection control while ensuring reliability by adding not only reliability but also operational efficiency such as transmission loss as an evaluation item for the above-mentioned multiple alternative modules.

[0092] When processing step S105, the simulated environment generating unit 104 may use a future predicted value as the grid state data 201. When performing this processing, the grid state acquiring unit 102 may store data of future time predicted using a known prediction technique in the grid state data 201, and generate a power model and a system model for the future time. In addition, a power model and a system model reflecting an accident situation such as a power line break as a future situation may be generated. A plurality of models with different conditions and data assuming the future are generated, and steps S105 to S106 are executed in parallel (or sequentially) for each model, and in step S107, if all power evaluations and system evaluations based on the plurality of models are OK, the alternative module is determined to be applicable. In this way, it is possible to ensure reliability for various situations that may occur.

[0093] FIG. 11 is an explanatory diagram showing an example of a motion detection display screen in an embodiment of the present invention.

[0094] The motion detection display screen 1100 is called from a menu screen (not shown) and displays the contents of the motion detection data 204. The contents of the motion detection data 204 displayed on the motion detection display screen 1100 are the same as those described in FIG. 7, and therefore detailed description will be omitted. The motion detection display screen 1100 may display a portion of the motion detection data 204, or may also display data not included in the motion detection data 204. The motion detection display screen 1100 may include a [Change] button (not shown) that allows the user to change a portion of the motion detection data 204, and a [Back] button (not shown) that closes the screen and returns to the menu screen from which it was called.

[0095] FIG. 12 is an explanatory diagram showing an example of a processing configuration display screen in the embodiment of the present invention.

[0096] The processing configuration display screen 1200 is called from the menu screen, and displays the contents of the processing configuration data 205. The contents of the processing configuration data 205 displayed on the processing configuration display screen 1200 are the same as those explained in Fig. 8, and therefore detailed explanation will be omitted. Furthermore, the processing configuration display screen 1200 may display a part of the processing configuration data 205, or may also display data that is not included in the processing configuration data 205. The processing configuration display screen 1200 may include a [Change] button (not shown) that allows the user to change a part of the processing configuration data 205, and a [Back] button (not shown) that closes the screen and returns to the menu screen that called it.

[0097] FIG. 13 is an explanatory diagram showing an example of a processing evaluation display screen in the embodiment of the present invention.

[0098] The processing evaluation display screen 1300 is called from the menu screen and displays the contents of the processing evaluation data 206. The contents of the processing evaluation data 206 displayed on the processing evaluation display screen 1300 are the same as those explained in Fig. 9, so detailed explanation will be omitted. Furthermore, the processing evaluation display screen 1300 may display a part of the processing evaluation data 206, or may also display data not included in the processing evaluation data 206.

[0099] According to the above-described embodiments of the present invention, even when various situation changes occur in a power system, such as changes in sensor devices due to failures or updates, changes in the processing of protective devices, and the addition of renewable energy sources or changes in power generation conditions, it is possible to adaptively update devices and systems for protecting and controlling substations, etc., while ensuring the reliability of power and the system.

[0100] Furthermore, the system according to the embodiment of the present invention may be configured as follows.

[0101] (1) A power system planning device (e.g., power system planning device 2), in which the power system has a plurality of electric devices (e.g., electric device 602) that change a state of power flow in the power system, and a plurality of measuring devices (e.g., measuring device 601) that measure a state of the power system, and a power system protection control device is connected to the power system, and the power system planning device has a processing unit (e.g., processing unit 10) and a recording unit (e.g., recording unit 20), and the recording unit records equipment status data (e.g., at least one of equipment setting data 212 and equipment status data 213) including states of the plurality of electric devices, equipment configuration data (e.g., equipment configuration data 202) including parameter values ​​of the plurality of electric devices, a change in the state of the power system, and among protection control modules for controlling the power system by being executed by the power system protection control device, a protection control module that is affected by the change, and a protection control module that is affected by the change, thereby mitigating an effect of the change. The processing unit detects a change in the state of the power system (e.g., step S102), identifies the alternative protection control module for mitigating an effect of the detected change based on the change detection data (e.g., step S104), evaluates the reliability of the power system when the power system protection control device uses the identified alternative protection control module based on the equipment state data and the equipment configuration data (e.g., steps S105 and S106), determines whether to use the identified alternative protection control module based on the result of the evaluation of the reliability of the power system (e.g., step S107), and if it is determined that the identified alternative protection control module will be used, outputs an instruction to the power system protection control device to execute control using the identified alternative protection control module (e.g., step S108).

[0102] This makes it possible to adaptively update protection and control devices and systems at substations and other facilities while ensuring the reliability of the power system, even when various changes in conditions occur in the power system, such as changes to sensor devices due to failures or updates, changes to the processing of protective devices, the addition of renewable energy sources, or changes in power generation conditions.

[0103] (2) In the above (1), the processing unit evaluates the reliability of the power system when the identified alternative protection and control module is used based on both a power model for evaluating the reliability of the power system as an electrical circuit and a system model for evaluating the reliability of an information system including the electrical equipment, the measuring equipment, and the power system protection and control device (e.g., steps S105, S106).

[0104] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring power and system reliability.

[0105] (3) In the above (2), the change detection data includes information that matches, for each of changes in the state of the power system that affect the reliability of the power system as an electrical circuit (e.g., a change in temperature) and changes that affect the reliability of the information system (e.g., a change in the amount of output data), a protection control module that is affected by the change and the alternative protection control module, and the processing unit identifies the alternative protection control module corresponding to the detected change in the state of the power system based on the change detection data, and evaluates the reliability of the power system when the identified alternative protection control module is used based on both the power model and the system model.

[0106] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring power and system reliability.

[0107] (4) In the above (3), the processing unit calculates, based on the power model, an index for evaluating the reliability of the power system as an electrical circuit when the identified alternative protection and control module is applied.

[0108] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring the reliability of the power system's electrical circuits.

[0109] (5) In the above (4), the processing unit further calculates an index for evaluating the operational efficiency of the power system when the identified alternative protection control module is used based on the power model, and determines whether to use the identified alternative protection control module based on the results of evaluating the reliability of the power system and the operational efficiency of the power system.

[0110] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring the reliability of the power system's electrical circuits and taking into account operational efficiency.

[0111] (6) In the above (5), an index for evaluating the reliability of the power system as an electric circuit includes at least one of voltage and frequency at one or more measurement points of the power system, and an index for evaluating the operational efficiency of the power system includes transmission loss in the power system.

[0112] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring the reliability of the power system's electrical circuits and taking into account operational efficiency.

[0113] (7) In the above (3), the processing unit calculates, based on the system model, an index for evaluating the reliability of the information system when the identified alternative protection control module is used.

[0114] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring system reliability.

[0115] (8) In the above (7), an index for evaluating the reliability of the information system includes at least one of a processing delay and a communication delay of the information system.

[0116] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring system reliability.

[0117] (9) In the above (3), the recording unit holds state measurement data (e.g., state measurement data 211) including at least one of measurement values ​​by the multiple measuring instruments in the power system and predicted future measurement values, the change detection data includes information that matches a change in at least one of the measurement values ​​and future measurement values ​​by at least one of the multiple measuring instruments, a protection control module affected by the change, and the alternative protection control module, and the processing unit detects the change in at least one of the measurement values ​​and future measurement values ​​as a change in the state of the power system based on the state measurement data.

[0118] This will enable adaptive updates to protection and control devices and systems at substations, etc., while ensuring the reliability of the power grid, even when predicted future changes in conditions occur.

[0119] (10) In the above (3), the processing unit evaluates, based on the equipment status data and the equipment configuration data, the reliability of the power system when the identified alternative protection control module is used in the event of an accident in the power system.

[0120] This will enable adaptive updates to protection and control devices and systems at substations, etc., to ensure the reliability of the power grid while reducing the impact of accidents in the event they occur.

[0121] (11) In the above (3), the change detection data includes information correlating one of the protection control modules affected by the change with multiple alternative protection control modules, and the processing unit evaluates the reliability of the power system when each of the multiple alternative protection control modules is used, and identifies the alternative protection control module to be used by comparing the results of the evaluation of the reliability of the power system based on predetermined conditions.

[0122] This enables protection and control devices and systems in substations, etc. to be adaptively updated so that control is more appropriate to the detected changes.

[0123] (12) In the above (11), the processing unit identifies the alternative protection control module that is most highly evaluated as having the highest reliability of the power system when used, based on the evaluation results of the reliability of the power system, as the alternative protection control module to be used.

[0124] This enables protection and control devices and systems in substations, etc. to be adaptively updated so that control is more appropriate to the detected changes.

[0125] The present invention is not limited to the above-mentioned embodiment, but includes various modifications. For example, the above-mentioned embodiment has been described in detail for a better understanding of the present invention, and is not necessarily limited to those including all of the configurations described. Also, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Also, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

[0126] In addition, the above-mentioned configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware, for example, by designing them as integrated circuits. In addition, the above-mentioned configurations, functions, etc. may be realized in software by a processor interpreting and executing a program that realizes each function. Information such as a program, table, file, etc. that realizes each function can be stored in a storage device such as a non-volatile semiconductor memory, a hard disk drive, or an SSD (Solid State Drive), or in a computer-readable non-transitory data storage medium such as an IC card, an SD card, or a DVD.

[0127] In addition, the control lines and information lines are shown as those considered necessary for the explanation, and not all control lines and information lines in the product are shown. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0128] 1. Power system protection and control system 2. Power system planning device 3. The First Communication Network 4. Secondary Communication Network 5. Power system protection and control equipment 6 Power System Electrical Equipment 10 Processing section 20 Recording Section 31 Communications Department 32 Input section 33 Display section 50 Protection and Control Module

Claims

1. A power system planning device, comprising: The power system includes a plurality of electric devices that change a state of a power flow in the power system, and a plurality of measuring devices that measure a state of the power system, A power system protection and control device is connected to the power system, The power system planning apparatus has a processing unit and a recording unit, The recording unit is device status data including states of the plurality of electrical devices; device configuration data including parameter values ​​of the plurality of electrical devices; hold change detection data that associates a change in the state of the power system with a protection control module that is affected by the change among protection control modules for controlling the power system by being executed by the power system protection control device, and an alternative protection control module that is a protection control module for mitigating the effect of the change by substituting the protection control module that is affected by the change; The processing unit includes: Detecting a change in a state of the power grid; Identifying the alternative protection and control module for mitigating an effect of the detected change based on the change detection data; Evaluating reliability of the power system when the power system protection control device uses the identified alternative protection and control module based on the equipment status data and the equipment configuration data; determining whether to use the identified alternative protection and control module based on a result of evaluating the reliability of the power system; When it is determined that the identified alternative protection control module is to be used, an instruction to the power system protection control device to execute control using the identified alternative protection control module is output.

2. The power system planning device according to claim 1, the processing unit evaluates the reliability of the power system when the identified alternative protection and control module is used, based on both a power model for evaluating the reliability of the power system as an electric circuit, and a system model for evaluating the reliability of an information system including the electric equipment, the measuring equipment, and the power system protection and control device.

3. The power system planning device according to claim 2, The change detection data includes information that associates a protection control module affected by a change in the state of the power system that affects the reliability of the power system as an electric circuit and a change that affects the reliability of the information system with the alternative protection control module, the processing unit identifies the alternative protection and control module corresponding to the detected change in the state of the power system based on the change detection data, and evaluates the reliability of the power system when the identified alternative protection and control module is used based on both the power model and the system model.

4. The power system planning device according to claim 3, The processing unit calculates, based on the power model, an index for evaluating the reliability of the power system as an electric circuit when the identified alternative protection control module is applied.

5. The power system planning device according to claim 4, The processing unit further calculates, based on the power model, an index for evaluating an operational efficiency of the power system when the identified alternative protection and control module is used; A power system planning device comprising: a power system planning unit that determines whether to use the identified alternative protection control module based on a result of evaluating the reliability of the power system and the operational efficiency of the power system.

6. The power system planning device according to claim 5, The index for evaluating the reliability of the electric power system as an electric circuit includes at least one of a voltage and a frequency at one or more measurement points of the electric power system, The power system planning apparatus, wherein an index for evaluating an operational efficiency of the power system includes a transmission loss in the power system.

7. The power system planning device according to claim 3, The power system planning device, wherein the processing unit calculates, based on the system model, an index for evaluating the reliability of the information system when the identified alternative protection and control module is used.

8. The power system planning device according to claim 7, The power system planning device, wherein an index for evaluating the reliability of the information system includes at least one of a processing delay and a communication delay of the information system.

9. The power system planning device according to claim 3, The recording unit holds state measurement data including at least one of measurement values ​​by the plurality of measuring devices in the power system and predicted future measurement values; The change detection data includes information that associates a change in at least one of a measurement value and a future measurement value by at least one of the plurality of measuring devices, a protection control module affected by the change, and the alternative protection control module; The processing unit includes: A power system planning device comprising: a power system planning unit configured to detect a change in at least one of the measured value and a future measured value based on the state measurement data as a change in the state of the power system.

10. The power system planning device according to claim 3, The processing unit includes: A power system planning device characterized in that it evaluates the reliability of the power system when the identified alternative protection control module is applied in the event of an accident in the power system, based on the equipment status data and the equipment configuration data.

11. The power system planning device according to claim 3, The change detection data includes information that associates one of the protection control modules affected by the change with a plurality of the alternative protection control modules, The processing unit evaluates reliability of the power system when each of the plurality of alternative protection and control modules is used, A power system planning device comprising: a power system planning unit that identifies the alternative protection control module to be used by comparing results of evaluation of the reliability of the power system based on predetermined conditions.

12. The power system planning device according to claim 11, The processing unit identifies the alternative protection control module that has the highest evaluation of the reliability of the power system when used, based on the evaluation result of the reliability of the power system, as the alternative protection control module to be used.

13. A power system planning method executed by a power system planning apparatus, comprising: The power system includes a plurality of electric devices that change a state of a power flow in the power system, and a plurality of measuring devices that measure a state of the power system, A power system protection and control device is connected to the power system, The power system planning apparatus has a processing unit and a recording unit, The recording unit is device status data including states of the plurality of electrical devices; device configuration data including parameter values ​​of the plurality of electrical devices; hold change detection data that associates a change in the state of the power system with a protection control module that is affected by the change among protection control modules for controlling the power system by being executed by the power system protection control device, and an alternative protection control module that is a protection control module for mitigating the effect of the change by substituting the protection control module that is affected by the change; The power system planning method includes: A step in which the processing unit detects a change in a state of the power grid; A procedure in which the processing unit identifies the alternative protection control module for mitigating an effect of the detected change based on the change detection data; A procedure in which the processing unit evaluates the reliability of the power system when the power system protection control device uses the identified alternative protection and control module based on the device status data and the device configuration data; A procedure in which the processing unit determines whether to use the identified alternative protection control module based on a result of evaluating the reliability of the power system; and when the processing unit determines that the identified alternative protection and control module is to be applied, outputting to the power system protection control device an instruction to execute control using the identified alternative protection and control module.

14. A power system protection and control system, comprising: The power system includes a plurality of electric devices that change a state of a power flow in the power system, and a plurality of measuring devices that measure a state of the power system, The power system protection and control system includes a power system planning device and a power system protection and control device, The power system planning apparatus has a processing unit and a recording unit, The recording unit is Device status data including the statuses of the plurality of electrical devices; device configuration data including parameter values ​​of the plurality of electrical devices; hold change detection data that associates a change in the state of the power system with a protection control module that is affected by the change among protection control modules for controlling the power system by being executed by the power system protection control device, and an alternative protection control module that is a protection control module for mitigating the effect of the change by substituting the protection control module that is affected by the change; The processing unit includes: Detecting a change in a state of the power grid; identifying the alternative protection and control module for mitigating an effect of the detected change based on the change detection data; Evaluating reliability of the power system when the power system protection control device uses the identified alternative protection and control module based on the equipment status data and the equipment configuration data; determining whether to use the identified alternative protection and control module based on a result of evaluating the reliability of the power system; When it is determined that the identified alternative protection control module is to be used, an instruction to execute control using the identified alternative protection control module is output to the power system protection control device; The power system protection and control system is characterized in that the power system protection and control device controls the power system based on the identified alternative protection and control module.

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