Power business support equipment and power grid control system

Abstract

To provide a power operation support device which supports power operations.SOLUTION: A power operation support device according to a first embodiment is a device for supporting power operations. The power operation support device comprises a storage section for storing a power system data model representing a real-world power system as a data set. The power operation support device comprises a data provision section for providing data on the power system data model to a power operation system. The power system data model consists of data indicating information representing the power system so as not to contradict electrically.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a power service support device and a power system control system.

Background Art

[0002] As the power demand increases, power facilities such as transmission lines, transformers, and distribution lines in the power system are constantly added and expanded. In a power system control system for monitoring and controlling these facilities, it is necessary to add and change equipment data and display screens corresponding to the added facilities each time.

[0003] In addition, the introduction of new equipment and the increase in equipment lead to changes in system characteristics, forcing the need to change the operation methods and control methods of these equipment.

[0004] Operations such as inspection and repair of power facilities are carried out by stopping the working power facilities and related power facilities necessary for the work in order to maintain the supply reliability. On the other hand, with the stoppage of power facilities, there is a possibility that the risk of system utilization restrictions due to equipment capacity excess and the occurrence of power outages increases. Therefore, in the work stoppage plan, it is necessary to consider adjustments to the work schedule and the power system configuration during the work, etc.

[0005] When making a work stoppage plan, the operator of the power system first checks the state quantities such as the power flow situation and voltage situation based on past performance. Next, the operator sets the equipment to be stopped and the equipment to be added or removed in the future, and predicts the future state quantities based on past performance. Then, the operator performs the stop operation of the equipment and monitors the state quantities.

[0006] A power system control system for monitoring and controlling a power system is associated with the monitored equipment, captures the state quantities measured in the equipment, and uses them for state monitoring display, alarm confirmation, recording, and storage. The operator inputs the information recorded by the power system control system into another business system, predicts the future state quantities based on the results of prior simulation and desk study, and determines whether the equipment can be stopped.

[0007] Therefore, equipment whose state variables cannot be measured is excluded from the equipment monitored by the power grid control system. In other words, measurement information is necessary for equipment to be monitored. Therefore, when measurement information is unavailable, operators manually adjust the state variables to ensure consistency and then decide whether or not to shut down the equipment. However, adjusting all power flow profiles 24 hours a day, 365 days a year is not practical. For this reason, operators set up and review representative power flow profiles and grid configurations, typically several dozen profiles per year.

[0008] However, manual adjustments are prone to errors because they require repeated recalculations due to incorrect input of system configurations and incorrect setting of state variables, and errors occur because the analysis cross-sections are discrete and not continuous.

[0009] Furthermore, the power grid control system only monitors the current state. Management of connections, supply and demand balance, and other state conditions are handled by specialized business systems separate from the power grid control system. Therefore, determining whether or not to shut down equipment in the future requires consistency between connection management and state management, but this process is often manual and time-consuming.

[0010] On the other hand, a system that integrates the power grid control system and all other business systems into a single integrated system may be able to solve problems without manual intervention through data linkage. However, such an integrated system would require updating business systems that were installed at different times, which would not only be cost-ineffective but could also lead to a loss of scalability, such as changes or additions to monitored equipment or the addition of new business systems.

[0011] The technology described in Patent Document 1 relates to a power grid control system. The power grid control system described in Patent Document 1 can improve the supply reliability and resilience of the power grid while ensuring accountability.

[0012] The technology described in Patent Document 2 relates to a monitoring and control system for monitoring the status of facilities installed in buildings, water and sewage bureaus, dams, etc. The monitoring and control system described in Patent Document 2 can perform functions for numerical analysis processing with the lowest possible load. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 2022-12452 [Patent Document 2] Japanese Patent Publication No. 2022-17857 [Overview of the project] [Problems that the invention aims to solve]

[0014] The power grid control system described in Patent Document 1 maintains a control table created based on conditions set through desk studies and the results of prior simulations. However, setting the control table requires a complex process, demanding a lot of computation time, and also carries the risk of incorrect settings.

[0015] The monitoring and control system described in Patent Document 2 is effective for self-contained equipment configurations such as plants, where it is a single system configuration. However, when equipment configurations are constantly being updated and multiple systems installed at different times are intricately interconnected, the monitoring and control system described in Patent Document 2, even with distributed functions, cannot avoid functional modifications according to the equipment configuration, and the reduction in computational load is limited. Furthermore, the equipment configuration of power grids changes moment by moment over time. [Means for solving the problem]

[0016] This invention one condition Mr. / Ms. , supporting power operations Power business supportIt is a device. The power business support device includes a storage unit that stores a power system data model representing the real-world power system as a data set. The power business support device includes a data providing unit that provides the data of the power system data model to the power business system. The power business support system includes a state quantity estimation unit that estimates state quantities for the entire power system from known state quantities in the power system. The power business support system also includes a version control unit that manages the version of the power system data model. The power system data model It includes attribute data indicating the attributes of equipment in the power system, relationship data indicating the relationships between equipment in the power system, and state quantity data indicating the state quantities in the power system estimated by the state quantity estimation unit. is composed of data indicating information representing the power system so as to be electrically consistent. The state quantity estimation unit estimates future state quantities in the future power system after a change, if there is a planned future change in at least one of the attribute data and relationship data. The version control unit stores the power system data model, which includes state quantity data showing the future state quantities estimated by the state quantity estimation unit, in the storage unit as the future power system data model.

[0017] The one aspect Mr. / Ms. of the present invention is a Power grid control system for monitoring and controlling a real-world power system. The power system control system includes a power business support device for supporting power business. The power system control system includes a power system control device for monitoring and controlling the power system. The power business support device includes a storage unit that stores a power system data model representing the real-world power system as a data set. The power business support device includes a data providing unit that provides the data of the power system data model to the power system control device. The power business support system includes a state quantity estimation unit that estimates state quantities for the entire power system from known state quantities in the power system. The power business support system also includes a version control unit that manages the version of the power system data model. The power system data model It includes attribute data indicating the attributes of equipment in the power system, relationship data indicating the relationships between equipment in the power system, and state quantity data indicating the state quantities in the power system estimated by the state quantity estimation unit. is composed of data indicating information representing the power system so as to be electrically consistent. The state quantity estimation unit estimates future state quantities in the future power system after a change, if there is a planned future change in at least one of the attribute data and relationship data. The version control unit stores the power system data model, which includes state quantity data showing the future state quantities estimated by the state quantity estimation unit, in the storage unit as the future power system data model.

Brief Description of the Drawings

[0018] [Figure 1] It is a diagram showing an example of the usage form of the power system control system 100. [Figure 2] It is a diagram showing an example of the power business support server 110. [Figure 3] It is a diagram showing an example of the power system data model PSD. [Figure 4] It is a diagram showing an example of the process executed when the current power system PS changes. [Figure 5] It is a diagram showing an example of the state quantity acquired by the state quantity acquisition unit 111C. [Figure 6] It is a diagram showing an example of the state quantity estimated by the state quantity estimation unit 111D. [Figure 7]This figure shows an example of the process for providing data for the Power System Data Model (PSD). [Figure 8] This figure shows an example of the process that is executed when there are future plans for changes to the power grid (PS). [Modes for carrying out the invention]

[0019] The present invention will be described below through embodiments, but these embodiments are not intended to limit the scope of the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0020] Figure 1 shows an example of how the power grid control system 100 is used. The power grid control system 100 is a system that monitors and controls a real-world power grid PS.

[0021] A power grid PS is an integrated system that combines power generation, transformation, transmission, and distribution to supply electricity to the receiving facilities of consumers. A power grid PS is equipped with multiple measuring devices (MDs).

[0022] The measuring device MD is a device that measures state variables in a power system PS. For example, the measuring device MD is a voltmeter that measures the voltage of a busbar. It can also be a power meter that measures the active power input and output to a busbar. It can also be a power meter that measures the reactive power input and output to a busbar. It can also be an ammeter that measures the current flowing between two busbars. When the measuring device MD measures state variables in a power system PS, it transmits data indicating the measured values ​​to the power business support server 110.

[0023] The power grid control system 100 includes a power operations support server 110 and a power grid control server 120. The power operations support server 110 is an example of a power operations support device. The power grid control server 120 is an example of a power grid control device.

[0024] The power business support server 110 is a computer that supports power business operations. The power business support server 110 stores the power system data model PSD. The power system data model PSD is a data model that abstracts information representing the power system PS and describes it in a certain structure and format in order to represent the power system PS as a data set. The power business support server 110 is connected to multiple measuring devices MD, the power system control server 120, and multiple power business servers PBS. The power business servers PBS are devices used for power business operations. The power business servers PBS are an example of a power business system. The power business support server 110 receives data indicating state quantities measured by the measuring devices MD from the measuring devices MD. The state quantities measured by the measuring devices MD are examples of known state quantities in the power system PS. The power business support server 110 provides the data of the power system data model PSD to the power system control server 120 and the multiple power business servers PBS.

[0025] The power system control server 120 is a computer that monitors and controls power system PSs. The power system control server 120 is connected to the power business support server 110. The power system control server 120 indirectly monitors and controls power system PSs by referring to the power system data model PSD data provided by the power business support server 110.

[0026] The power operations server PBS is a server that functions, for example, as a power system analysis system. The power system analysis system performs power flow calculations by referring to data from the power system data model PSD provided by the power operations support server 110. Power flow calculations are calculations that determine the voltage distribution, current, and power flowing across the entire power system PS from only some known state variables. In this embodiment, power flow calculations are performed on the power operations support server 110. The power system analysis system also performs fault calculations by referring to data from the power system data model PSD provided by the power operations support server 110. Fault calculations are calculations that use the symmetric coordinate method to separate the three-phase voltage and current into positive-sequence, negative-sequence, and zero-sequence symmetric components and calculate the fault current and voltage for each phase during an unbalanced fault. The power system analysis system also performs steady-state stability analysis by referring to data from the power system data model PSD provided by the power operations support server 110. Steady-state stability analysis is an analysis of whether the power flow and load of the power system PS are in a state where power can be transmitted stably. Furthermore, the power system analysis system performs dynamic stability analysis by referring to data from the power system data model PSD provided by the power business support server 110, for example. Dynamic stability analysis is an analysis to prevent generator detachment and system separation even in the event of sudden disturbances such as transmission line accidents. Furthermore, the power system analysis system performs DC transmission analysis by referring to data from the power system data model PSD provided by the power business support server 110, for example. DC transmission analysis is various analyses related to high-voltage DC transmission and frequency substations. Furthermore, the power system analysis system performs power electronics analysis by referring to data from the power system data model PSD provided by the power business support server 110, for example. Power electronics analysis is an analysis of the power system PS including power electronics equipment. Furthermore, the power system analysis system performs lightning surge analysis by referring to data from the power system data model PSD provided by the power business support server 110, for example. Lightning surge analysis is an analysis of the propagation characteristics of surge voltage and current during lightning strikes.Furthermore, the power system analysis system performs high-frequency analysis by referring to data from the power system data model PSD provided by, for example, the power business support server 110. High-frequency analysis is an analysis of harmonic instability phenomena occurring in AC / DC interconnected systems. In addition, the power system analysis system performs inrush current analysis by referring to data from the power system data model PSD provided by, for example, the power business support server 110. Inrush current analysis is an analysis of countermeasures for inrush current that occurs when a transformer is connected to the power system PS.

[0027] Furthermore, the power operations server PBS is a server that functions, for example, as a work stoppage planning system. The work stoppage planning system, for example, refers to the data of the power system data model PSD provided by the power operations support server 110 and executes work stoppage plans. A work stoppage plan is a process of adjusting and formulating the scope, timing, and duration of work stoppages based on work stoppage plans submitted by work stoppage plan submitters, in order to implement work stoppages in a planned and smooth manner.

[0028] Furthermore, the power operations server PBS is a server that functions, for example, as a power outage management system. The power outage management system refers to data from the power system data model PSD provided by the power operations support server 110, for example, and performs power outage management. Power outage management is the process of detecting power outages, providing information, and instructing appropriate responses.

[0029] Figure 2 shows an example of a power business support server 110. The power business support server 110 includes a CPU 111, main memory 112, input / output interface 113, input device 114, output device 115, communication device 116, and storage 117.

[0030] The CPU 111 is a device that controls the main memory 112, input / output interface 113, input device 114, output device 115, communication device 116, and storage 117, and performs data calculations, etc.

[0031] The main memory 112 is a storage device within the power business support server 110 that stores data and programs, and is connected to the CPU 111 via electrical wiring on the circuit board. The main memory 112 stores, for example, the currently running program code and data necessary for immediate processing related to the power system data model PSD.

[0032] The input / output interface 113 connects the CPU 111 to the input device 114, output device 115, communication device 116, and storage 117 via cables, etc., and is a mechanism for sending and receiving data and control information.

[0033] The input device 114 is a device for providing data, information, instructions, etc., to the power business support server 110. The input device 114 is used, for example, to provide the power business support server 110 with data, information, instructions, etc., related to state quantities that cannot be obtained from the power system PS.

[0034] The output device 115 is a device that receives data from a running program and physically presents it externally in a form that can be recognized by humans. For example, the output device 115 is a display that shows a power system PS, which is abstracted as a power system data model PSD, in a form that can be recognized by humans.

[0035] The communication device 116 is a device for connecting the power business support server 110 to the communication network. The communication device 116 communicates with the measuring device MD, the power system control server 120, and the power business server PBS via the communication network.

[0036] Storage 117 is a device that permanently stores data. Storage 117 stores the power system data model PSD. Storage 117 is an example of a storage unit.

[0037] Figure 3 shows an example of a power system data model (PSD). The power system data model (PSD) includes the current system data model (PSD1), the past system data model (PSD2), and the future system data model (PSD3).

[0038] The current power grid data model PSD1 is a data model that represents the current power grid PS as a data set. The past power grid data model PSD2 is a data model that represents past power grid PS as a data set. The future power grid data model PSD3 is a data model that represents future power grid PS as a data set.

[0039] The current system data model PSD1, the past system data model PSD2, and the future system data model PSD3 include attribute data AD, relationship data RD, and state quantity data SD. Attribute data AD, relationship data RD, and state quantity data SD are data that represent the power system PS in an electrically consistent manner.

[0040] Attribute data AD is data that indicates the attributes of equipment in a power system PS. Equipment in a power system PS includes, for example, transmission lines, transformers, shunt reactors, and power factor correction capacitors. Attributes of equipment in a power system PS include, for example, system constants such as the impedance of transmission lines and transformers, the reactance of shunt reactors, and the susceptance of power factor correction capacitors. Attribute data AD is edited by the power system PS operator to match the attributes of the equipment in the power system PS. The power system PS operator edits attribute data AD, for example, when system constants change due to maintenance of equipment in the power system PS. The power system PS operator edits attribute data AD, for example, when system constants change due to replacement of equipment in the power system PS. The power system PS operator edits attribute data AD, for example, when equipment in the power system PS is removed. The attributes of equipment in a power system PS are an example of information that represents the power system PS in an electrically consistent manner.

[0041] Relationship data RD is data that shows the relationships between equipment in a power system PS. The relationships between equipment in a power system PS are, for example, the electrical connection relationships between equipment, which are determined by the switching on / off status of switches and the equipment configuration in the power system PS. Relationship data RD is edited by measuring devices that capture switch on / off information or by the operators of the power system PS so that it matches the electrical connection relationships between equipment in the power system PS. The operators of the power system PS edit relationship data RD when the electrical connection relationships between equipment change, for example, due to the addition or removal of equipment in the power system PS. The relationships between equipment in a power system PS are an example of information that represents the power system PS in an electrically consistent manner.

[0042] State variable data (SD) represents the state variables in a power system (PS). These state variables include, for example, current, voltage, and power values. The state variables in a power system are an example of information that represents the power system in an electrically consistent manner.

[0043] Returning to the explanation of Figure 2, the CPU 111 functions as an attribute acquisition unit 111A, a relationship acquisition unit 111B, and a state quantity acquisition unit 111C, based on the program installed on the power business support server 110. The CPU 111 also functions as a state quantity estimation unit 111D, a version management unit 111E, and a data provision unit 111F.

[0044] The attribute acquisition unit 111A is a software module that acquires attribute information of equipment in the power system PS. The attribute acquisition unit 111A acquires attribute information of equipment input via, for example, the input device 114.

[0045] The relationship acquisition unit 111B is a software module that acquires information about the relationships between equipment in a power system PS. The relationship acquisition unit 111B acquires information about the relationships between equipment that is input via, for example, the input device 114.

[0046] The state quantity acquisition unit 111C is a software module that acquires state quantity information in the power system PS. The state quantity acquisition unit 111C acquires state quantity information indicated by data received from, for example, the measuring device MD.

[0047] The state quantity estimation unit 111D is a software module that estimates the state quantities of the entire power system from known state quantities in the power system PS. The state quantity estimation unit 111D uses the state quantities acquired by the state quantity acquisition unit 111C as known state quantities and estimates the state quantities of the entire power system from the known state quantities. If at least one of the attribute data AD and the relationship data RD changes, the state quantity estimation unit 111D estimates the current state quantities in the power system PS after the change. If there is a future plan for at least one of the attribute data AD and the relationship data RD to change, the state quantity estimation unit 111D estimates the future state quantities in the power system PS after the change. The state quantity data SD shows the state quantities estimated by the state quantity estimation unit 111D.

[0048] The version control unit 111E is a software module that manages the version of the power system data model PSD. When at least one of the attribute data AD and the relationship data RD changes, the version control unit 111E stores the power system data model PSD before the change in storage 117 as past system data model PSD2. The version control unit 111E stores the power system data model PSD containing state quantity data SD, which indicates the current state quantity estimated by the state quantity estimation unit 111D, in storage 117 as current system data model PSD1. The version control unit 111E stores the power system data model PSD containing state quantity data SD, which indicates the future state quantity estimated by the state quantity estimation unit 111D, in storage 117 as future system data model PSD3.

[0049] The data provision unit 111F is a software module that provides data from the power system data model PSD to the power system control server 120 and the power business server PBS.

[0050] The data provision unit 111F provides data with a reference tag attached if the attribute data AD and relationship data RD have not changed. The power system control server 120 and the power operations server PBS can determine that the attributes of the equipment in the power system PS and the relationships between the equipment in the power system PS have not changed when data with a reference tag is provided. The reference tag is an example of a first tag.

[0051] The data provision unit 111F provides data with an event tag attached if the relationship data RD has changed but the attribute data AD has not changed. The power system control server 120 and the power business server PBS can determine, upon receiving data with an event tag, that the relationships between equipment in the power system PS have changed, but the attributes of the equipment in the power system PS have not changed. When providing data with an event tag, the data provision unit 111F also provides data that can identify the change in the relationship data RD. Data that can identify the change in the relationship data RD is, for example, data that notifies how the relationships between equipment in the power system PS have changed. The event tag is an example of a second tag.

[0052] The data provision unit 111F provides data with a command tag attached when the attribute data AD changes. The power system control server 120 and the power business server PBS can determine that the attributes of the equipment in the power system PS have changed when data with a command tag is provided. When providing data with a command tag, the data provision unit 111F also provides data that can identify the change in the attribute data AD. Data that can identify the change in the attribute data AD is, for example, data that notifies that the attributes of the equipment in the power system PS have changed. A command tag is an example of a third tag. A command tag may also be generated when the attribute data AD is edited by an operator.

[0053] Figure 4 shows an example of the process executed when the power system PS changes. The power business support server 110 executes the process shown in Figure 4 when the attributes of the equipment in the power system PS or the relationships between the equipment in the power system PS change. The power business support server 110 executes the process shown in Figure 4 when the relationships between the equipment in the power system PS change.

[0054] First, the version control unit 111E stores the power system data model PSD before the change in the storage 117 as the past system data model PSD2 (S101). For example, the version control unit 111E stores the power system data model PSD currently stored as the system data model PSD1 as the past system data model PSD2.

[0055] When the power system PS administrator changes the system constants due to maintenance of the equipment in the power system PS, they input information about the attributes of the equipment in the power system PS via the input device 114. When the electrical connection relationships between equipment change due to additions, removals, etc., of equipment in the power system PS administrator, they input information about the relationships between equipment in the power system PS via the input device 114.

[0056] When information on the attributes of equipment in the power system PS is entered, the attribute acquisition unit 111A updates the attribute data AD of the current system data model PSD1 to reflect the entered information (S102). When information on the relationships between equipment in the power system PS is entered, the relationship acquisition unit 111B updates the relationship data RD of the current system data model PSD1 to reflect the entered information (S102).

[0057] Next, the state quantity acquisition unit 111C acquires state quantities in the power system PS (S103). The state quantity acquisition unit 111C acquires, for example, measurement data of state quantities from all measuring devices MD. The state quantity acquisition unit 111C acquires, for example, measurement data of state quantities from predetermined measuring devices MD. The state quantity acquisition unit 111C acquires, for example, measurement data of state quantities from measuring devices MD designated by the power system PS administrator. The state quantity acquisition unit 111C acquires, for example, measurement data of state quantities from measuring devices MD when executing the process in S103. The state quantity acquisition unit 111C reads, for example, measurement data of state quantities previously acquired from measuring devices MD.

[0058] Next, the state quantity estimation unit 111D estimates the state quantities for the entire power system (S104). The state quantity estimation unit 111D uses the state quantities obtained by the state quantity acquisition unit 111C as known state quantities and estimates the state quantities for the entire power system from the known state quantities. The state quantity estimation unit 111D estimates the state quantities for the entire power system using, for example, known state estimation techniques. For example, the state quantity estimation unit 111D uses PowerFactory, developed by DIgSILENT GmbH in Germany, as a known state estimation technique. PowerFactory is an integrated solution used for the design and analysis of power systems. For example, the state quantity estimation unit 111D can use the state estimation technique described in U.S. Patent Application Publication No. 2014 / 0244189.

[0059] Figure 5 shows an example of state quantities acquired by the state quantity acquisition unit 111C. Figure 5 shows a power system PS including a power supply P1, a first busbar GL1, a second busbar GL2, a first switch S1, a second switch S2, and a third switch S3. In the example shown in Figure 5, the measured voltage of the first busbar GL1 is 69 (kV). The measured voltage of the second busbar GL2 is 67 (kV). The measured active power of the first busbar GL1 is 101 (MW). The measured active power of the second busbar GL2 is 98 (MW). The measured reactive power of the first busbar GL1 is 4 (MVar). The measured reactive power of the second busbar GL2 is 6 (MVar). The measured current flowing between the busbars is 876 (A). In the example shown in Figure 5, the measured values ​​of busbar voltage, active power, reactive power, and inter-busbar current are electrically contradictory. For example, when the second switch S2 is "on," meaning the first busbar GL1 and the second busbar GL2 are connected, the active power of the first busbar GL1 and the active power of the second busbar GL2 must be the same. An electrical inconsistency would be a situation where, for example, the measured value of the active power of the first busbar GL1 and the measured value of the active power of the second busbar GL2 do not match.

[0060] The state quantity estimation unit 111D estimates the true state quantities in an electrically consistent manner, using the state quantities shown in Figure 5 as known state quantities. (1) For example, the state quantity estimation unit 111D takes the average of the measured voltage of the first bus GL1 and the measured voltage of the second bus GL2 and assumes that the voltages of the first bus GL1 and the second bus GL2 are 68 (kV). (2) For example, the state quantity estimation unit 111D takes the average of the measured active power of the first bus GL1 and the measured active power of the second bus GL2 and assumes that the active power of the first bus GL1 and the second bus GL2 is 99.5 (MW). (3) For example, the state quantity estimation unit 111D takes the average of the measured reactive power of the first bus GL1 and the measured reactive power of the second bus GL2 and assumes that the reactive power of the first bus GL1 and the second bus GL2 is 5 (MVar). (4) The state quantity estimation unit 111D calculates apparent power by taking the square root of the average power, for example, and assumes the apparent power to be 99.6 (MVA). (5) The state quantity estimation unit 111D assumes the current flowing between the buses to be 846 (A) based on the assumed value of apparent power and the assumed values ​​of the voltages of the first bus GL1 and the second bus GL2. (6) The state quantity estimation unit 111D assumes the current flowing between the buses to be 861 (A) by taking the average of the measured value of the current flowing between the buses and the assumed value of the current flowing between the buses. (7) The state quantity estimation unit 111D calculates the standard deviations for the bus voltage, active power, reactive power, and bus current, for example, for each mean value. (8) The state quantity estimation unit 111D corrects the measured value with the largest standard deviation so that the deviation becomes smaller. (9) The state quantity estimation unit 111D repeats the processes (1) to (8) based on the corrected results, and when it converges to the minimum overall standard deviation, it takes those values ​​as the state estimation result.

[0061] Figure 6 shows an example of state variables estimated by the state variable estimation unit 111D. In the example shown in Figure 6, the true voltage of the first bus GL1 and the second bus GL2 is estimated to be 68 (kV). The true active power of the first bus GL1 and the second bus GL2 is estimated to be 100 (MW). The true reactive power of the first bus GL1 and the second bus GL2 is estimated to be 4 (MVar). The true current flowing between the buses is estimated to be 850 (A). In the example shown in Figure 6, the estimated values ​​of bus voltage, active power, reactive power, and inter-bus current are electrically consistent.

[0062] The power system data model PSD is a data set that represents the real-world power system PS using these electrically consistent values. Therefore, the power business support server 110 can link with the power business server PBS and the power system control server 120 using the same data set. As a result, the power system control system 100 can become a highly scalable system regardless of when the power business server PBS was built.

[0063] Returning to the explanation of Figure 4, the state quantity estimation unit 111D then updates the state quantity data SD of the current system data model PSD1 to reflect the state quantities estimated by the state quantity estimation unit 111D (S105).

[0064] Next, the version control unit 111E stores the modified power system data model PSD as the current system data model PSD1 in the storage 117 (S106).

[0065] Figure 7 shows an example of the process for providing data for the power system data model PSD. The power business support server 110 executes the process shown in Figure 7 when certain predetermined conditions are met. For example, the power business support server 110 executes the process shown in Figure 7 when it receives a data provision request from the power system control server 120. For example, the power business support server 110 executes the process shown in Figure 7 when it receives a data provision request from the power business server PBS. For example, the power business support server 110 executes the process shown in Figure 7 when the current system data model PSD1 is updated. For example, the power business support server 110 executes the process shown in Figure 7 at a predetermined time. For example, the power business support server 110 executes the process shown in Figure 7 at predetermined intervals. For example, the power business support server 110 executes the process shown in Figure 7 when an execution command is input by the administrator of the power system PS.

[0066] First, the data supply unit 111F determines whether at least one of the attribute data AD and the relationship data RD has changed (S201). If the process in Figure 7 is executed when the current system data model PSD1 is updated, the data supply unit 111F determines that at least one of the attribute data AD and the relationship data RD has changed. If the process in Figure 7 is executed when other conditions are met, the data supply unit 111F determines whether the current system data model PSD1 has been updated since the last execution of the process in Figure 7. If the current system data model PSD1 has been updated, the data supply unit 111F determines that at least one of the attribute data AD and the relationship data RD has changed.

[0067] If neither the attribute data AD nor the relationship data RD has changed in S201 (S201; NO), the data provision unit 111F provides the data with a reference tag attached (S202). When the process in Figure 7 is executed upon receiving a data provision request, the data provision unit 111F provides the data with a reference tag attached to the requesting server. When the process in Figure 7 is executed when other conditions are met, the data provision unit 111F provides the data with a reference tag attached to a predetermined server.

[0068] If at least one of the attribute data AD and the relationship data RD has changed in S201 (S201; YES), the data provision unit 111F determines whether the attribute data AD has changed (S203). The data provision unit 111F determines, for example, whether the relationship data RD has been updated and the current system data model PSD1 has been updated since the last execution of the process in Figure 7.

[0069] If the attribute data AD has not changed in S203 (S203; NO), the data provision unit 111F provides the data with an event tag (S204). When the process in Figure 7 is executed upon receiving a data provision request, the data provision unit 111F provides the data with the event tag to the requesting server. When the process in Figure 7 is executed when other conditions are met, the data provision unit 111F provides the data with the event tag to a predetermined server. If the attribute data AD has not changed in S203, it means that the relationship data RD has changed. Therefore, when providing the data with the event tag, the data provision unit 111F provides data that can identify the change in the relationship data RD.

[0070] If attribute data AD has changed in S203 (S203; YES), the data provision unit 111F provides data with a command tag attached (S205). When the process in Figure 7 is executed upon receiving a data provision request, the data provision unit 111F provides the requesting server with the command tag attached. When the process in Figure 7 is executed when other conditions are met, the data provision unit 111F provides the command tag attached data to a predetermined server. When providing the command tag attached data, the data provision unit 111F provides data that can identify the change in attribute data AD. If attribute data AD has changed in S203, this means that either the relationship data RD has not changed or the relationship data RD has changed. Therefore, when providing the command tag attached data, if the relationship data RD has also changed, the data provision unit 111F also provides data that can identify the change in relationship data RD.

[0071] The power operations support server 110, through tag-based classification, can efficiently provide only the necessary amount of data from the vast data set of power system PSs. By providing only the necessary amount of data, the power system control server 120 and the power operations server PBS can process the data efficiently.

[0072] Figure 8 shows an example of the process that is executed when there is a planned change in the power grid PS. The power business support server 110 executes the process shown in Figure 8 when there is a planned change in the power grid PS.

[0073] If the power system PS administrator anticipates changes in system constants due to maintenance of equipment in the power system PS, they input information about the attributes of the equipment in the power system PS in the future via the input device 114. If the power system PS administrator anticipates changes in the electrical connection relationships between equipment due to additions or other modifications to the equipment in the power system PS, they input information about the relationships between the equipment in the power system PS in the future via the input device 114.

[0074] When information on the attributes of equipment in a future power grid PS is input, the attribute acquisition unit 111A generates attribute data AD to reflect the input information (S301). When information on the relationships between equipment in a future power grid PS is input, the relationship acquisition unit 111B generates relationship data RD to reflect the input information (S302).

[0075] Next, the state quantity estimation unit 111D estimates the state quantities for the entire power system in the future (S302). The state quantity estimation unit 111D estimates the state quantities for the entire power system, for example, by utilizing known state estimation techniques.

[0076] Next, the state quantity estimation unit 111D generates state quantity data SD that reflects the state quantities estimated by the state quantity estimation unit 111D (S303).

[0077] Next, the version control unit 111E stores the power system data model PSD, which includes attribute data AD, relationship data RD, and state quantity data SD, in the storage 117 as the future system data model PSD3 (S304).

[0078] As described above, the power business support server 110 in the above embodiment is a device that supports power business. The power business support server 110 includes a storage 117 that stores a power system data model PSD, which represents the power system PS in the real world as a data set. The power business support server 110 includes a data provision unit 111F that provides data from the power system data model PSD to the power system control server 120 and the power business server PBS. The power system data model PSD is composed of data that represents information about the power system PS in an electrically consistent manner. With this configuration, the power system control server 120 and the power business server PBS can use data that represents information about the power system PS, which is configured in an electrically consistent manner.

[0079] The power system data model PSD in the above embodiment includes attribute data AD indicating the attributes of equipment in the power system PS. The power system data model PSD includes relationship data RD indicating the relationships between equipment in the power system PS. The power system data model PSD includes state quantity data SD indicating state quantities in the power system PS. With this configuration, the power system control server 120 and the power operations server PBS can use data indicating equipment attributes, data indicating relationships between equipment, and data indicating state quantities as data configured to be electrically consistent.

[0080] In the above embodiment, the power business support server 110 includes a state quantity estimation unit 111D that estimates state quantities for the entire power system from known state quantities in the power system PS. The state quantity data SD represents the state quantities estimated by the state quantity estimation unit 111D. With this configuration, the power system control server 120 and the power business server PBS can use electrically consistent state quantity data SD instead of known state quantities in the power system PS.

[0081] In the above embodiment, the power business support server 110 includes a state quantity acquisition unit 111C that acquires state quantities in the power system PS. The state quantity estimation unit 111D uses the state quantities acquired by the state quantity acquisition unit 111C as known state quantities and estimates the state quantities for the entire power system from the known state quantities. With this configuration, the power system control server 120 and the power business server PBS can use electrically consistent state quantity data SD instead of state quantities acquired from the power system PS.

[0082] In the above embodiment, the power business support server 110 includes a version control unit 111E that manages the version of the power system data model PSD. When at least one of the attribute data AD and the relationship data RD changes, the version control unit 111E stores the power system data model PSD before the change in storage 117 as the past system data model PSD2. With this configuration, the power system control server 120 and the power business server PBS can use the data of the past system data model PSD2, which represents past power systems PS as a data set.

[0083] In the above embodiment, the state quantity estimation unit 111D estimates the current state quantity in the power system PS after a change if at least one of the attribute data AD and the relationship data RD changes. The version control unit 111E stores the power system data model PSD, which includes the state quantity data SD indicating the current state quantity estimated by the state quantity estimation unit 111D, in the storage 117 as the current system data model PSD1. With this configuration, the power system control server 120 and the power business server PBS can use data that represents information about the power system PS, which is configured in an electrically consistent manner even if the attributes of the equipment and the relationships between equipment change.

[0084] In the above embodiment, the power business support server 110 includes a version control unit 111E that manages the version of the power system data model PSD. The state quantity estimation unit 111D estimates future state quantities in the future power system PS after the change if there is a future plan for at least one of the attribute data AD and the relationship data RD to change. The version control unit 111E stores the power system data model PSD, which includes state quantity data SD indicating the future state quantities estimated by the state quantity estimation unit 111D, in the storage 117 as the future system data model PSD3. With this configuration, the power system control server 120 and the power business server PBS can use the data of the future system data model PSD3, which represents the future power system PS as a data set.

[0085] In the above embodiment, the data provision unit 111F provides data with a reference tag attached if the attribute data AD and relationship data RD have not changed. With this configuration, the power system control server 120 and the power operations server PBS can determine that the attributes of the equipment in the power system PS and the relationships between the equipment have not changed when data with a reference tag is provided.

[0086] In the above embodiment, the data provision unit 111F provides data with an event tag attached if the attribute data AD has not changed when the relationship data RD has changed. With this configuration, the power system control server 120 and the power operations server PBS can determine that, when data with an event tag is provided, the relationship between equipment in the power system PS has changed, but the attributes of the equipment have not changed.

[0087] In the above embodiment, the data provision unit 111F provides data that can identify changes in relationship data RD when providing event-tagged data. With this configuration, the power system control server 120 and the power operations server PBS can determine how the relationships between equipment in the power system PS have changed.

[0088] In the above embodiment, the data provision unit 111F provides data with a command tag attached when the attribute data AD changes. With this configuration, the power system control server 120 and the power operations server PBS can determine that the attributes of the equipment in the power system PS have changed when data with a command tag is provided.

[0089] In the above embodiment, the data provision unit 111F provides data that can identify changes in attribute data AD when providing data with command tags. With this configuration, the power system control server 120 and the power operations server PBS can determine how the attributes of the equipment in the power system PS have changed.

[0090] The power system control system 100 in the above embodiment is a system for monitoring and controlling power systems PS in the real world. The power system control system 100 includes a power business support server 110 that supports power operations. The power system control system 100 includes a power system control server 120 that monitors and controls power systems PS. The power business support server 110 includes storage 117 that stores a power system data model PSD, which represents power systems PS as a data set. The power business support server 110 includes a data provision unit 111F that provides data from the power system data model PSD to the power system control server 120. The power system data model PSD is composed of data that represents information about power systems PS in an electrically consistent manner. With this configuration, the power system control server 120 can use data that represents information about power systems PS, which is configured in an electrically consistent manner.

[0091] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that a variety of modifications or improvements can be made to the above embodiments. It will be clear from the claims that such modified or improved forms may be included within the technical scope of the present invention.

[0092] In the above embodiment, as shown in the examples in Figures 5 and 6, the state quantity estimation unit 111D estimates the state quantities for the entire power system from known state quantities that have measurement errors but no missing data. However, even when there are missing data, the state quantity estimation unit 111D can estimate the state quantities for the entire power system from measured known state quantities using known state estimation techniques.

[0093] In the above embodiment, the power business support server 110 provides the power system data model PSD, which represents one power system PS as a data set, to the power system control server 120 and the power business server PBS. However, in the real world, power system PSs are interconnected, with power system PSs supplied by a first power company and power system PSs supplied by a second power company. In this case, the power business support server 110 may be provided for each power system PS. The first power business support server and the second power business support server may share the power system data model PSD data they provide with each other.

[0094] The execution order of operations, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not explicitly stated as "before," "prior to," etc. It should be noted that the execution order of each process can be implemented in any order, unless the output of a previous process is used in a later process. Even if the operation flow in the claims, specifications, and drawings is explained using phrases such as "first," "next," etc. for convenience, it does not mean that it is essential to perform the operations in that order. [Explanation of Symbols]

[0095] 100 Power System Control Systems 110 Power Business Support Server 111 CPU 111A Attribute acquisition part 111B Relationship acquisition unit 111C State quantity acquisition unit 111D State quantity estimation unit 111E Version Control Department 111F Data Provision Department 112 Main Memory 113 Input / Output Interfaces 114 Input device 115 Output device 116 Communication equipment 117 Storage 120 Power System Control Server AD attribute data GL1 1st bus bar GL2 2nd bus bar MD measuring device P1 power supply PBS Power Management Server PS power system PSD Power System Data Model PSD1 Current System Data Model PSD2 Historical System Data Model PSD3 Future System Data Model RD Relationship Data S1 1st switch S2 2nd switch S3 Third switch SD state data

Claims

1. A power business support device that assists power business operations, A memory unit that stores a power system data model that represents the real world's power system as a data set, A data provision unit that provides the data of the aforementioned power system data model to the power business system, A state quantity estimation unit that estimates state quantities in the entire power system from known state quantities in the aforementioned power system, The system includes a version control unit for managing the version of the power system data model, The power system data model includes attribute data indicating the attributes of equipment in the power system, relationship data indicating the relationships between equipment in the power system, and state quantity data indicating state quantities in the power system estimated by the state quantity estimation unit, and is composed of data that represents information about the power system in an electrically consistent manner. The state quantity estimation unit estimates the future state quantities in the power system after the change, if there is a future plan for at least one of the attribute data and the relationship data to change. The power business support device includes a version control unit which stores the power system data model, which includes the state quantity data indicating future state quantities estimated by the state quantity estimation unit, as a future power system data model in the storage unit.

2. The system includes a state quantity acquisition unit that acquires state quantities in the aforementioned power system, The power business support device according to claim 1, wherein the state quantity estimation unit estimates the state quantities in the entire power system from the known state quantities, using the state quantities obtained by the state quantity acquisition unit as known state quantities.

3. The system includes a version control unit that manages the version of the aforementioned power system data model, The power business support device according to claim 1, wherein when at least one of the attribute data and the relationship data changes, the version control unit stores the power system data model before the change in the storage unit as the past power system data model.

4. The state quantity estimation unit estimates the current state quantity in the power system after the change if at least one of the attribute data and the relationship data changes. The power business support device according to claim 3, wherein the version control unit stores the power system data model, which includes the state quantity data indicating the current state quantity estimated by the state quantity estimation unit, in the storage unit as the current power system data model.

5. The power business support device according to claim 1, wherein the data provision unit provides the data with a first tag attached if the attribute data and the relationship data have not changed.

6. The power business support device according to claim 1, wherein the data provision unit provides the data with a second tag attached when the relationship data has changed but the attribute data has not changed.

7. The power business support device according to claim 6, wherein the data provision unit provides data that can identify changes in the relationship data when providing the data with the second tag attached.

8. The power business support device according to claim 1, wherein the data provision unit provides the data with a third tag attached when the attribute data changes.

9. The power business support device according to claim 8, wherein the data provision unit provides data that can identify changes in the attribute data when providing data with the third tag attached.

10. A power grid control system that monitors and controls power grids in the real world, Power business support equipment that supports power business operations, The system comprises a power system control device for monitoring and controlling the aforementioned power system, The aforementioned power business support device, A storage unit that stores a power system data model representing the aforementioned power system as a data set, A data provision unit that provides the data of the power system data model to the power system control device, A state quantity estimation unit that estimates state quantities in the entire power system from known state quantities in the aforementioned power system, The system includes a version control unit for managing the version of the power system data model, The power system data model includes attribute data indicating the attributes of equipment in the power system, relationship data indicating the relationships between equipment in the power system, and state quantity data indicating state quantities in the power system estimated by the state quantity estimation unit, and is composed of data that represents information about the power system in an electrically consistent manner. The state quantity estimation unit estimates the future state quantities in the power system after the change, if there is a future plan for at least one of the attribute data and the relationship data to change. A power system control system in which the version control unit stores the power system data model, which includes the state quantity data indicating future state quantities estimated by the state quantity estimation unit, in the storage unit as the future power system data model.

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