Protection control planning apparatus and protection control planning method

Abstract

To plan a protection control plan at a low operation cost while satisfying a dynamic constraint condition on reliability in a device for planning the protection control plan by combining preventive control and post-control.SOLUTION: A protection control plan planning device according to the present invention includes a predicted state generation section that generates a future predicted state of a power system, a first protection control plan planning section that plans a first protection control plan of the power system that satisfies a constraint condition related to control of the power system in the predicted state of the power system, a second protection control plan planning section that can plan a second protection control plan of the power system that satisfies the constraint condition when an assumed accident occurs in the predicted state of the power system, and a planning plan change section that creates predetermined information related to the constraint condition for changing a plan content of at least one of the first protection control plan and the second protection control plan when the second protection control plan planning section cannot plan the second protection control plan that satisfies the constraint condition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a protection and control planning device and a protection and control planning method for a power system. [Background technology]

[0002] Conventionally, the entire system (hereinafter referred to as "power grid") that is composed of power generation facilities, power transmission facilities, substation facilities, distribution facilities, and consumer facilities and handles everything from the production to consumption of electricity has been known. The operation of a power grid requires high-quality power supply and highly reliable and efficient operation, not only when no accidents occur (normal times) but also when a failure or abnormality occurs in the power grid equipment (accidents). Furthermore, in recent years, with the expansion of renewable energy sources such as solar and wind power, uncertain and short-term system changes, such as fluctuations in power flow, have increased, and responses to these changes are also required.

[0003] In power systems, the introduction of a large number of new facilities can lead to increased facility construction costs and a decline in facility utilization efficiency. Therefore, it is becoming increasingly important for power transmission and distribution operators, who are responsible for ensuring the reliability and efficiency of the power supply, to ensure reliability by responding to short-term system fluctuations with the necessary and sufficient facilities, while also achieving efficient system operation.

[0004] To maintain a high-quality power supply in a power grid, a protection and control system has traditionally been operated by linking a high-level system, such as a central control center, which is responsible for wide-area coordinated operations, with a low-level system, such as a substation, which is responsible for monitoring and controlling equipment. The protection and control system monitors the status of substation equipment and controls generators, circuit breakers, and other equipment, for example. The protection and control system also has a protection function that maintains reliability by isolating the abnormal part from the power grid in the event of a failure or abnormality in the power grid equipment to prevent the accident from spreading. One example of such a protection function is a protective relay that isolates the equipment when the current or voltage of the equipment is excessive.

[0005] In conventional protection and control systems, mid- to long-term protection and control plans (protection and control plans) are prepared on a yearly or monthly basis based on actual data, and mid- to long-term changes such as changes in the system configuration are addressed by changing device settings in the field. However, the traditional method of preparing protection and control plans makes it difficult to respond to short-term system changes. Therefore, it is necessary to prepare protection and control plans that can respond to short-term system changes and flexibly change device settings to ensure efficient system operation while maintaining reliability.

[0006] Therefore, preventive control has been known as a technique for formulating a protection control plan that can respond to short-term system changes (see, for example, Patent Document 1). Patent Document 1 discloses a technique for evaluating reliability based on the predicted future state of the power system and assumed accident cases, and determining control of power system equipment during normal times so as to improve reliability if the reliability does not satisfy predetermined conditions. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-216534 Summary of the Invention [Problem to be solved by the invention]

[0008] The technology disclosed in Patent Document 1 determines and executes control during normal times to satisfy reliability in preparation for the occurrence of a predicted accident. However, preventive control, which performs preventive control in preparation for an accident during normal times before an accident occurs, requires changing control in preparation for an accident that may or may not occur. In this case, if preventive control results in output suppression of renewable energy power sources, operating costs may increase. Furthermore, if there is an accident that cannot be handled within the range that preventive control can control, it may not be possible to satisfy dynamic constraints on reliability.

[0009] In reality, some accidents can be addressed by protective control after the accident actually occurs (hereinafter referred to as "ex-fault control") without performing preventive control. However, if a direct optimization problem is attempted to solve the combination of preventive control and ex-fault control in order to develop a protective control plan that combines preventive control and ex-fault control, the problem becomes complex and large-scale. Furthermore, if ex-fault control considers not only continuous control, such as adjusting generator output after an accident, but also discrete control, such as operating a circuit breaker using a fault spread prevention relay, the problem becomes even more complex and large-scale, making it even more difficult to find an appropriate solution. Therefore, in the past, when a protective control plan that combines preventive control and ex-fault control was developed, the resulting plan may have reduced reliability or may be infeasible.

[0010] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a technology for creating (generating) a protection and control plan that combines preventive control and reactive control, and that satisfies dynamic constraints on reliability while achieving low operational costs. [Means for solving the problem]

[0011] In order to solve the above problems, the protection and control plan development device of the present invention includes a predicted state generation unit, a first protection and control plan development unit, a second protection and control plan development unit, and a development plan modification unit. The predicted state generation unit generates a future predicted state of the power system. The first protection and control plan development unit develops a first protection and control plan for the power system that satisfies constraints related to power system control in the predicted state of the power system generated by the predicted state generation unit. The second protection and control plan development unit is capable of developing a second protection and control plan for the power system that satisfies the constraints in the event that a postulated fault occurs in the predicted state of the power system generated by the predicted state generation unit. Furthermore, the development plan modification unit creates predetermined information related to constraints for modifying the content of at least one of the first protection and control plan and the second protection and control plan when the second protection and control plan development unit is unable to develop a second protection and control plan that satisfies the constraints.

[0012] Furthermore, in order to solve the above-mentioned problems, the present invention provides a protection and control plan formulation method executed by a protection and control plan formulation device including a processing unit that creates a protection and control plan for a power system. The protection and control plan formulation method includes the processing unit generating a future predicted state of the power system. The protection and control plan formulation method includes the processing unit formulating a first protection and control plan for the power system that satisfies constraints related to power system control in the generated predicted state of the power system. The protection and control plan formulation method also includes the processing unit formulating a second protection and control plan for the power system in the event of a postulated fault occurring in the generated predicted state of the power system. The protection and control plan formulation method also includes the processing unit, when the processing unit is unable to formulate a second protection and control plan that satisfies the constraints, creating predetermined information related to constraints for changing the content of at least one of the first protection and control plan and the second protection and control plan. [Effects of the Invention]

[0013] According to the present invention having the above configuration, in an apparatus and method for formulating a protection control plan that combines preventive control and reactive control, it is possible to formulate a protection control plan with low operating costs while satisfying dynamic constraints on reliability. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a configuration diagram of a power system protection and control system including a protection and control planning device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing an example of the configuration of state measurement data stored in a recording unit of the protection and control planning device according to one embodiment of the present invention. [Figure 3] FIG. 2 is a diagram showing an example of the configuration of device setting data stored in a recording unit of a protection and control planning device according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing an example of the configuration of equipment status data stored in a recording unit of a protection and control planning device according to an embodiment of the present invention. [Figure 5]1 is a diagram showing an example of the configuration of system equipment configuration data stored in a recording unit of a protection and control planning device according to an embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a diagram showing an example of the configuration of assumed accident data stored in a recording unit of the protection and control planning device according to one embodiment of the present invention. [Figure 7] 1 is a diagram showing an example of the configuration of normal state control plan data stored in a recording unit of a protection control plan drafting device according to an embodiment of the present invention. FIG. [Figure 8] FIG. 2 is a diagram showing an example of the configuration of ex-post control range data stored in a recording unit of the protection and control planning device according to one embodiment of the present invention. [Figure 9] FIG. 2 is a diagram showing an example of the configuration of ex-post control plan data stored in a recording unit of the protection and control plan drafting device according to one embodiment of the present invention. [Figure 10] FIG. 2 is a diagram showing an example of the configuration of reliability evaluation data stored in a recording unit of the protection and control planning device according to one embodiment of the present invention. [Figure 11] FIG. 2 is a diagram showing an example of the configuration of plan evaluation data stored in a recording unit of the protection and control plan drafting device according to one embodiment of the present invention. [Figure 12] FIG. 2 is a diagram showing an example of the configuration of constraint condition adjustment data stored in a recording unit of the protection and control planning device according to one embodiment of the present invention. [Figure 13] 1 is a flowchart showing the procedure of a protection and control plan formulation process performed by a protection and control plan formulation device according to an embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing an example of the configuration of normal state control plan data after constraint condition adjustment stored in a recording unit of a protection control plan formulation device according to one embodiment of the present invention. [Figure 15] FIG. 10 is a diagram showing an example of the configuration of post-control range data after constraint condition adjustment stored in a recording unit of a protection and control planning apparatus according to an embodiment of the present invention. [Figure 16] FIG. 10 is a diagram showing an example of the configuration of post-control plan data after constraint condition adjustment stored in a recording unit of a protection and control plan drafting device according to an embodiment of the present invention. [Figure 17]FIG. 1 is a diagram showing a display mode of a normal state control plan formulated by a protection and control plan formulation device according to an embodiment of the present invention. [Figure 18] FIG. 10 is a diagram showing a display mode of a post-control plan formulated by a protection and control plan formulation device according to one embodiment of the present invention. [Figure 19] 10 is a flowchart showing the procedure of a protection and control plan formulation process performed by the protection and control plan formulation device according to Modification 1 of the present invention. [Figure 20] 10 is a flowchart showing the procedure of a protection and control plan formulation process performed by a protection and control plan formulation device according to Modification 2 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a power system protection and control plan formulation device and a protection and control plan formulation method according to an embodiment of the present invention will be specifically described with reference to the drawings.

[0016] [Configuration of power system protection and control system] FIG. 1 is a configuration diagram of a power system protection and control system 1 including a power system protection and control planning device 2 according to one embodiment of the present invention.

[0017] As shown in Fig. 1, the power system protection and control system 1 includes a protection and control planning device 2, a plurality of power system protection and control devices 3, and a plurality of power system electrical devices 4. Within the power system protection and control system 1, the protection and control planning device 2 is communicatively connected to each of the plurality of power system protection and control devices 3 via a first communication network 5. Furthermore, within the power system protection and control system 1, each of the plurality of power system protection and control devices 3 is communicatively connected to a corresponding power system electrical device 4 among the plurality of power system electrical devices 4 via a second communication network 6.

[0018] (Protection and control planning device) The protection and control plan making device 2 makes a protection and control plan that combines preventive control and post-fault control of the power system. In this case, the protection and control plan making device 2 separately makes a protection and control plan for performing preventive control (hereinafter referred to as a "normal control plan") and a protection and control plan for performing fault control (hereinafter referred to as a "post-fault control plan"). The internal configuration of the protection and control plan making device 2 and the method for making (creating) the normal control plan and the post-fault control plan will be described in detail later.

[0019] (Power system protection and control device) As shown in FIG. 1, the power system protection control device 3 includes one or more protection control modules 50, a management unit 51, and a communication unit 52.

[0020] The protection control module 50 is a module for realizing processes such as acquiring various data measured by measuring equipment 62 (described later) in the power system electrical equipment 4, and operating and changing the settings of electrical equipment 61 (described later).

[0021] The protection control module 50 has a module processing unit 50a, a module recording unit 50b, and a module communication unit 50c. The module processing unit 50a executes processing of operations such as protection and control for the power system electrical device 4. The module recording unit 50b stores the processing contents of the module processing unit 50a. In addition, the module communication unit 50c communicates with the power system electrical device 4 via the second communication network 6.

[0022] In the protection control module 50, first, the module communication unit 50c acquires measurement data from a measuring instrument 62 (described later) in the power system electrical device 4 via the second communication network 6 in response to an instruction input from the module processing unit 50a. At this time, the acquired measurement data is stored in the module recording unit 50b.

[0023] Thereafter, the module processing unit 50a uses the measurement data and other setting data stored in the module recording unit 50b to determine the operation content for an electric device 61 (described later) in the power system electric device 4. Then, the module communication unit 50c transmits information (operation data) on the determined operation content to the electric device 61 (described later) via the second communication network 6, and changes the setting (state) of the electric device 61.

[0024] The above-described operation of the protection control module 50 is an example, and various processes required for the protection and control of the power system are performed in the processing of the protection control module 50. For example, it is possible to execute a process for transmitting information to the protection and control plan formulation device 2 via the communication unit 52, a process for storing measurement data from the measuring device 62 described below, a process for operating the electric device 61 described below, and a process that combines other useful processes.

[0025] The management unit 51 manages a plurality of protection control modules 50. Specifically, the management unit 51 selects a protection control module 50 that will actually execute processing from one or more protection control modules 50 held in the power system protection control device 3. Note that in the power system protection control device 3 of this embodiment, the protection control module 50 can be replaced using known technology such as a virtual machine or a container, but the replacement of the protection control module 50 may also be achieved using other methods. Furthermore, the communication unit 52 communicates with the protection control plan formulation device 2 via the first communication network 5.

[0026] The power system protection controller 3 is configured with, for example, a circuit, a printed circuit board, a server, an information processing device, or the like, including an arithmetic device (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), a communication function unit, an operation device that accepts information input operations by an operator, and a display device that displays various information. The memory of the storage device includes a ROM (Read Only Memory) and a RAM (Random Access Memory). The module processing unit 50a and management unit 51 of the power system protection controller 3 are included in the arithmetic device, the module recording unit 50b is included in the recording device, and the module communication unit 50c and communication unit 52 are included in the communication device.

[0027] (Power System Electrical Equipment) As shown in FIG. 1, the power system electrical device 4 includes an electrical device 61 and a measuring device 62.

[0028] The electric equipment 61 is various types of equipment that make up the power system. For example, various types of equipment, such as power generation equipment (e.g., a power plant) that generates electricity using a power generation device, and consumer equipment that consumes the electricity generated by the power generation equipment, correspond to the electric equipment 61. In addition, various types of equipment, such as power distribution equipment (power transmission equipment, substation equipment, distribution equipment, etc.) that transmits generated electricity from the equipment to consumer equipment, and protection and control equipment such as protective relays that protect and appropriately control the equipment, also correspond to the electric equipment 61.

[0029] Examples of power generation equipment include thermal power generation equipment, hydroelectric power generation equipment, nuclear power generation equipment, geothermal power generation equipment, solar power generation equipment, and wind power generation equipment. Note that the present invention is not limited to these, and power generation equipment also includes equipment that generates electricity using various other power generation methods. Furthermore, examples of power distribution equipment include overhead transmission lines, underground transmission lines, transformers, circuit breakers, switches, phase modifying equipment, and bus bars. Note that the present invention is not limited to these, and power distribution equipment also includes various other equipment related to power transmission and distribution.

[0030] The measuring equipment 62 is a variety of measuring instruments that measure the state of the electrical equipment 61 (various facilities) and / or the state of the surrounding environment. The measuring equipment 62 includes a plurality of measuring devices for measuring the state at a specific measurement point in the power system.

[0031] The measurement items of the measuring device 62 include, for example, power items such as voltage, phase, and power, and meteorological items such as temperature, wind speed, wind direction, precipitation, and solar radiation. The measurement items of the measuring device 62 also include, for example, items related to the setting state and operating state of the electrical device 61, and items related to the operating state of devices that change the power flow state, such as power distribution facilities and power generation equipment. Note that the measurement items of the measuring device 62 may also include various other items.

[0032] Furthermore, measurement points of the measuring equipment 62 include, for example, a busbar of a power generation facility, a busbar of a substation facility, a power distribution facility, a consumer facility, etc. Note that one or more measuring devices may be installed at one measurement point.

[0033] Then, various measurement data measured by the measuring device 62 is transmitted to the power system protection and control device 3 via the second communication network 6. Note that the various measurement data measured by the measuring device 62 may also be configured to be transmitted to the protection and control plan making device 2 via the first communication network 5.

[0034] [Configuration of the protection and control planning device] As shown in FIG. 1, the protection and control planning device 2 includes a processing unit 10, a recording unit 20, a communication unit 31, an input unit 32, an output unit 33, and a bus line 34 connecting them together.

[0035] In this embodiment, the protection and control planning device 2, like the power system protection control device 3, is configured with, for example, a circuit, a printed circuit board, a server, an information processing device, etc., including an arithmetic device unit such as a CPU or a microprocessor, a storage device unit such as a memory (ROM and RAM), a hard disk or an SSD, a communication device unit, an operation device unit that accepts information input operations by a user (planner), and a display device unit that displays various information. The processing unit 10, recording unit 20, communication unit 31, input unit 32, and output unit 33 of the protection and control planning device 2 are included in the arithmetic device unit, recording device unit, communication device unit, operation device unit, and display device unit, respectively.

[0036] (Processing section) As shown in FIG. 1, the processing unit 10 functionally includes a future system generation unit 11, a normal state control planning unit 12, a post-control range calculation unit 13, a post-control planning unit 14, a plan evaluation unit 15, an evaluation judgment unit 16, and a constraint condition adjustment unit 17.

[0037] In this embodiment, the processing unit 10 executes the processing of these functional units by reading the corresponding software program code from the ROM to the RAM, but some or all of the functional units of the processing unit 10 may be realized by hardware such as circuits. Also, the processing unit 10 is not limited to being configured by a single device, but may be configured by multiple devices connected to each other so as to be able to communicate with each other.

[0038] (1) Future system generation unit (predicted state generation unit) The future system generation unit 11 generates system status data 210 and system equipment configuration data 220 (described later) for the protection and control plan formulation period (future time). The future system generation unit 11 also stores the generated system status data 210 and system equipment configuration data 220 (described later) in a system status data storage unit 21 and a system equipment configuration data storage unit 22 (described later) in the recording unit 20, respectively.

[0039] The system status data 210 described below specifies, for example, measurement information of the measuring devices 62, power information of the electrical devices 61, weather information, setting state information of the electrical devices 61, and operating state information of the electrical devices 61 during the planning period. The system equipment configuration data 220 described below specifies, for example, information related to the electrical circuit aspects of the electrical devices 61 and the measuring devices 62 and information related to economic aspects during the planning period.

[0040] The following methods can be employed to generate the system status data 210 and the system equipment configuration data 220 described below. The future system generation unit 11 may, for example, acquire data input by a user (planner) to generate the system status data 210 and the system equipment configuration data 220 described below. The future system generation unit 11 may also, for example, acquire data from an external server (not shown) via the communication unit 31 to generate the system status data 210 and the system equipment configuration data 220 described below. The future system generation unit 11 may also use past system status data 210 and system equipment configuration data 220 described below to generate the system status data 210 and the system equipment configuration data 220 described below, for example, by using average value data for the same time in the past. The future system generation unit 11 may also generate the system status data 210 and the system equipment configuration data 220 described below using estimated values ​​at the planning date and time (period) obtained by a known machine learning technique. A known example of the use of machine learning technology is demand forecasting by learning weather data and demand data. Note that the method for creating the system status data 210 and the system equipment configuration data 220 described below can be selected appropriately depending on the accuracy required by the user (planner), for example, but when more accurate data is required, a known machine learning technology is used.

[0041] The future system generation unit 11 also generates an electric circuit by integrating specified equipment into system equipment configuration data 220 (described later), and extracts the amount of power generation, load, equipment settings, and operating status from system status data 210 (described later) and reflects these in the electric circuit, thereby generating a power system simulated environment (power system model) that can simulate the characteristics of the electric circuit at the target planning date and time (target planning period). Existing technologies can be used to generate the power system simulated environment. Furthermore, by constructing a power system simulated environment that can simulate more advanced characteristics, such as transient analysis and reflection of the effects of accidents in the electric circuit, more accurate evaluation indicators can be obtained.

[0042] (2) Normal Control Planning Department (First Protection and Control Planning Department) The normal operation control planning unit 12 performs calculations such as power flow calculations and transient calculations using the power system simulation environment (the predicted future state of the power system) generated by the future system generation unit 11 to simulate the characteristics of the power flow in the electric circuit. The normal operation control planning unit 12 then calculates the power flow state that optimizes a predetermined performance index within a range that satisfies the constraints under normal operation (constraints related to the control of the power system) and the setting values ​​of the electrical devices 61 in the power system under normal operation to achieve that power flow state. In this way, the normal operation control planning unit 12 creates a normal operation control plan (first protection and control plan). The normal operation control planning unit 12 also stores data of the created (drafted) normal operation control plan (normal operation control plan data 240, described below) in the normal operation control plan data storage unit 24, described below, within the recording unit 20.

[0043] The "constraint conditions under normal circumstances" referred to here are constraint conditions related to the stability of the power supply and the safety of the facilities. For example, the constraint conditions under normal circumstances include constraint conditions related to the balance between power demand and power generation, constraint conditions related to facility overload, and conditions that the bus voltage and generator output do not deviate from specified ranges.

[0044] Furthermore, when a proposed change to the constraint conditions in the normal-time control plan (constraint condition adjustment data 290 described later) is input from the constraint condition adjustment unit 17 described later, the normal-time control planning unit 12 reflects the proposed change to the constraint conditions in the normal-time control plan to change (adjust) the normal-time control plan. Then, the normal-time control planning unit 12 stores data of the changed normal-time control plan in a normal-time control plan data storage unit 24 described later in the recording unit 20. At this time, the normal-time control planning unit 12 may store the data of the changed normal-time control plan in a manner that overwrites the data of the normal-time control plan before the change, or may store the data of the changed normal-time control plan separately from the data of the normal-time control plan before the change.

[0045] (3) Post-control range calculation unit (controllable range calculation unit) The post-control range calculation unit 13 calculates the adjustment (change) range of the constraint conditions during normal times when a postulated accident occurs on a specified planning date and time. Specifically, the post-control range calculation unit 13 calculates the adjustment range (controllable range: hereinafter referred to as the "post-control range") of the setting value of each piece of equipment (electrical equipment 61) specified in the normal-time control plan data. Then, the post-control range calculation unit 13 stores the calculated post-control range data of each piece of equipment (post-control range data 250 described later) in a post-control range data storage unit 25 described later in the recording unit 20.

[0046] Various methods can be adopted to calculate the post-control range of each facility. For example, the post-control range of each facility can be calculated by evaluating (simulating) the state when an assumed accident occurs in the state of the power system in which normal-state control plan data is reflected in the power system simulation environment generated by the future system generation unit 11.

[0047] Furthermore, when a proposed change to the constraint conditions in the normal-state control plan (constraint condition adjustment data 290 described later) is input from the constraint condition adjustment unit 17 described later to the normal-state control plan unit 12, the post-control range calculation unit 13 reflects the proposed change to the constraint conditions in the post-control range to change (adjust) the post-control range. Then, the post-control range calculation unit 13 stores data of the changed post-control range in a post-control range data storage unit 25 described later in the recording unit 20. At this time, the post-control range calculation unit 13 may store the data of the changed post-control range in a manner that overwrites the data of the post-control range before the change, or may store the data of the changed post-control range separately from the data of the post-change.

[0048] (4) Post-event Control Planning Department (Second Protection and Control Planning Department) The post-control planning unit 14 simulates the power system state (system state at the time of the accident) when various hypothetical accidents occur in the power system simulated environment generated by the future system generation unit 11, and extracts from the simulated power system state that does not satisfy predetermined constraint conditions related to reliability as accident cases requiring response. Then, based on the post-control range data of each facility generated by the post-control range calculation unit 13, the post-control planning unit 14 determines the protection control settings (information such as the operating conditions of the post-control, the facilities to be controlled, and the processing content) that optimize the predetermined evaluation criteria using a predetermined algorithm. Note that the protection control settings determined at this time are the settings that optimize the predetermined evaluation criteria, and are not necessarily the settings that satisfy the predetermined constraint conditions.

[0049] In this embodiment, the post-control planning unit 14 creates a post-control plan (second protection and control plan) as described above. Then, the post-control planning unit 14 stores data of the created (drafted) post-control plan (post-control plan data 260, described later) in a post-control plan data storage unit 26, described later, in the recording unit 20.

[0050] Examples of "predetermined algorithms" that can be used to develop ex-post control plans include a complete enumeration of all combinations of protective control settings, deterministic algorithms such as greedy algorithms, and algorithms using metaheuristics such as simulated annealing and genetic algorithms. Examples of "predetermined evaluation criteria" include criteria such as the amount of change in the power generation or frequency of the power system due to the execution of protective control, the cost of executing protective control, the amount of improvement in constraints related to reliability due to the execution of protective control, the importance based on the risk and probability of occurrence of the hypothetical accident case to be addressed, and the ease of restoring the system to a normal state after the execution of protective control. Weights may be assigned to each of these multiple evaluation criteria, and a combination of the weighted multiple evaluation criteria may be used as the predetermined evaluation criteria.

[0051] As a specific example of creating a post-control plan by the post-control planning unit 14 (an example of planning a protection control module), consider the case of planning protection control settings for a protection control module that shuts off a generator in response to an overload on transmission line B. In this case, all combinations of generator shutoff are simulated (listed) for all generators that can be remotely shut off, and a protection control module is planned to set a combination of generator shutoff that will result in the load factor of transmission line B being closest to 100% (best). The algorithms and evaluation criteria used to create the post-control plan may be changed as appropriate depending on the type of anticipated accident and protection control function being targeted.

[0052] Furthermore, when a proposed change to the constraints in the normal-state control plan (constraint adjustment data 290 described later) is input from the constraint adjustment unit 17 described later to the normal-state control plan unit 12, the post-control planning unit 14 reflects the proposed change to the constraints in the post-control plan to change (adjust) the post-control plan. The post-control planning unit 14 then stores data of the changed post-control plan in a post-control plan data storage unit 26 described later in the recording unit 20. At this time, the post-control planning unit 14 may store the data of the changed post-control plan in a manner that overwrites the data of the post-control plan before the change, or may store the data of the changed post-control plan separately from the data of the post-control plan before the change.

[0053] (5) Planning and Evaluation Department The plan evaluation unit 15 evaluates the operating cost of the normal operation control plan created by the normal operation control planning unit 12. The operating cost of the normal operation control plan evaluated by the plan evaluation unit 15 may be, for example, a representative value of an index item indicating operating efficiency such as power generation cost or power transmission loss. Also, for example, if each index item is a quantitative value, a weight may be set for each index item, and the operating cost may be evaluated based on a combined value of multiple weighted index items.

[0054] Furthermore, the plan evaluation unit 15 simulates the power system state (system state after fault control) when a protection control module specified in the post-fault control plan is executed in the power system state (system state at the time of fault) when each postulated fault occurs while the normal control plan is being executed, and determines whether or not the state satisfies a predetermined constraint condition (predetermined standard) regarding reliability. Then, the plan evaluation unit 15 stores data of the reliability evaluation results in the simulation when each postulated fault occurs (reliability evaluation data 270 described below) in a reliability evaluation data storage unit 27 described below in the recording unit 20.

[0055] Furthermore, the plan evaluation unit 15 evaluates the reliability of a protection and control plan (a set of a normal control plan and a post-control plan) that combines normal control (preventive control) and post-control based on the reliability evaluation results of the simulation when each assumed accident occurs. Specifically, the plan evaluation unit 15 determines whether or not constraint conditions for the electrical equipment 61 (power system) are satisfied for all assumed accidents in the formulated protection and control plan. Then, the plan evaluation unit 15 stores the obtained reliability evaluation data (plan evaluation data 280 described below) in a plan evaluation data storage unit 28 described below in the recording unit 20.

[0056] The reliability evaluation is not limited to a binary judgment of whether or not the constraint conditions are satisfied, but may be performed by calculating a reliability index using a quantitative value based on the degree of violation of the constraint conditions, the risk of an assumed accident (impact, danger, loss cost, etc.), the probability of occurrence, etc. Also, the reliability evaluation may be the result of a judgment made by comparing the reliability index with a predetermined reliability reference value.

[0057] (6) Evaluation and Judgment Section The evaluation determination unit 16 determines whether or not the result of the reliability evaluation (plan evaluation data 280, described later) obtained by the plan evaluation unit 15 satisfies a predetermined standard.

[0058] As a method of evaluation by the evaluation determination unit 16, for example, when the result of the reliability evaluation is a quantitative value (amount of violation, degree of risk, etc.), not only the reliability evaluation but also the operation cost may be adopted as an evaluation parameter. In this case, the evaluation determination unit 16 may set weights for the quantitative values ​​of the reliability evaluation and the operation cost, respectively, and perform evaluation determination using a combined value of these.

[0059] (7) Constraint Condition Adjustment Unit (Planning and Plan Change Unit) The constraint condition adjustment unit 17 extracts the evaluation result of a scenario accident in which there is a constraint violation (in which the constraint conditions are not satisfied) from the evaluation result of the reliability of the simulation when each scenario accident occurs (reliability evaluation data described later) obtained by the plan evaluation unit 15. In this case, if there are multiple evaluation results of scenario accidents in which there is a constraint violation, the constraint condition adjustment unit 17 may extract, for example, the evaluation result with the largest amount of constraint violation as the representative evaluation result.

[0060] Then, based on the extracted content of the constraint violation, the constraint condition adjustment unit 17 creates a proposed change to the constraint conditions in the normal-time control plan (constraint condition adjustment data 290 described later: predetermined information related to the constraint conditions) required to resolve the constraint violation. The constraint condition adjustment unit 17 also outputs the created proposed change to the constraint conditions in the normal-time control plan to the normal-time control planning unit 12. Furthermore, the constraint condition adjustment unit 17 stores the created proposed change to the constraint conditions in the normal-time control plan (constraint condition adjustment data 290 described later) in a constraint condition adjustment data storage unit 29 in the recording unit 20 described later.

[0061] (Recording Department) 1, the recording unit 20 functionally includes a system state data storage unit 21, a system equipment configuration data storage unit 22, a postulated accident data storage unit 23, a normal state control plan data storage unit 24, and a post-control range data storage unit 25. The recording unit 20 also functionally includes a post-control plan data storage unit 26, a reliability evaluation data storage unit 27, a plan evaluation data storage unit 28, and a constraint condition adjustment data storage unit 29. The recording unit 20 is configured with a memory such as a RAM that can read and write information. The configuration of the various data stored in the recording unit 20 will be described in detail later.

[0062] (Communication section, input section, output section) The communication unit 31 is configured by a communication device, and transmits and receives various data to and from each device connected via a communication network. For example, the communication unit 31 transmits and receives various data to and from the power system protection control device 3 via the first communication network 5.

[0063] The input unit 32 is configured with a device that is operated when a user (planner) inputs information into the protection and control plan formulation device 2, and includes at least one operation device, such as a keyboard, a pointing device such as a mouse, a touch panel, or a voice input device. The input unit 32 generates an operation signal according to the content input by the user, and supplies the operation signal to the processing unit 10, etc.

[0064] The output unit 33 includes at least one of a display device such as a liquid crystal panel, a printer, an audio output device, etc. The display device included in the output unit 33 may be configured as a touch panel, in which case the display device included in the output unit 33 and the input unit 32 are configured integrally.

[0065] [Configuration of various data stored in the recording unit] (1) System status data storage section The system status data storage unit 21 stores (memorizes) system status data 210 for the protection and control plan planning period (future time) created (acquired) by the future system generation unit 11. In the example shown in Fig. 1 , the system status data storage unit 21 stores status measurement data 210a, equipment setting data 210b, and equipment status data 210c as the system status data 210.

[0066] The state measurement data 210a specifies state information of the power system at predetermined points (measurement points) in the power system during the planning period of the protection and control plan, environmental information, etc. Specifically, the state measurement data 210a specifies, for each planning date and time, measurement information from the measuring devices 62 in the power system, power information such as active power, reactive power, voltage, and phase from the electrical devices 61, and meteorological information (environmental information) such as temperature and wind speed.

[0067] Fig. 2 is a diagram showing an example of the configuration of state measurement data 210a. In the state measurement data 210a shown in Fig. 2, for each data management number 211a ("No." in the figure), a planning target date and time 212a, status information of the power system at each measurement point in the power system (such as point A in the figure), environmental information, etc. are specified as a set of data. Specifically, for management number "1," information such as planning target date and time "2026 / 06 / 28 08:22:28," temperature at point A "20.1 [°C]," active power "5.0 [MW]," and reactive power "2.1 [Mvar]" is specified as a set of data.

[0068] The content of the data specified at the measurement points in the state measurement data 210a varies depending on the measurement points in the power system. Furthermore, the state measurement data 210a may specify not only the state information, environmental information, etc. of the power system at a future target date and time for planning, but also the state information, environmental information, etc. of the power system at a past date and time.

[0069] The device setting data 210b defines information on the setting state of each electric device 61 in the power system during the period for which the protection and control plan is to be formulated.

[0070] 3 is a diagram showing an example of the configuration of device setting data 210b. In the device setting data 210b shown in FIG. 3, for each data management number 211b ("No." in the figure), a planning target date and time 212b and setting information (opening / closing information, tap position, etc.) of each electrical device 61 in the power system (e.g., circuit breaker equipment B1, B2, transformer equipment T1, T2, etc. in the figure) are specified as a set of data. Specifically, for management number "1," information such as the planning target date and time "2026 / 06 / 28 08:22:28," the open / close information of circuit breaker equipment B1 "closed," the open / close information of circuit breaker equipment B2 "closed," the tap position "3" of transformer equipment T1, and the tap position "4" of transformer equipment T2 are specified as a set of data.

[0071] The equipment status data 210c specifies information indicating the operating status of each electric device 61 in the power system during the planning period of the protection and control plan (hereinafter referred to as "operating status information"). For example, the equipment status data 210c specifies the operating status information of electric devices that change the power flow status of power distribution facilities, power generation equipment, etc. for each planning date and time.

[0072] 4 is a diagram showing an example of the configuration of equipment status data 210c. In the equipment status data 210c shown in FIG. 4, for each data management number 211c ("No." in the figure), a planning target date and time 212c and operation status information of each electrical device 61 in the power system (such as circuit breaker equipment B1 and B2, and transformer equipment T1 and T2 in the figure) are specified as a set of data. Specifically, for management number "1," information such as the planning target date and time "2026 / 06 / 28 08:22:28," operation status information "on" for circuit breaker equipment B1, operation status information "on" for circuit breaker equipment B2, operation status information "on" for transformer equipment T1, and operation status information "on" for transformer equipment T2 is specified as a set of data.

[0073] The content of the operational status information of the electric devices 61 specified in the device status data 210c varies depending on the type of the electric devices 61. For example, if the electric device 61 is a power transmission line, information such as a power transmission status is specified as operational status information in the device status data 210c. Furthermore, the content of the operational status information of the electric devices 61 specified in the device status data 210c may be specified by appropriately combining information measured by the measuring device 62 with the operational status information of the electric devices 61 depending on the type of the electric devices 61. Furthermore, the device status data 210c may specify not only operational status information of each electric device 61 in the power system at a future target planning date and time, but also operational status information of each electric device 61 at a past date and time.

[0074] (2) System equipment configuration data storage section The system equipment configuration data storage unit 22 stores (memorizes) system equipment configuration data 220 for the protection and control plan planning period (future time) created (acquired) by the future system generation unit 11. The system equipment configuration data 220 specifies information related to the electrical circuit aspects and information related to the economic aspects of each of the electrical equipment 61 and measuring equipment 62 included in the power system.

[0075] The system equipment configuration data 220 includes information related to electrical circuit aspects that is necessary for electrical circuit analysis of the power system. For example, the information related to electrical circuit aspects includes information related to operational conditions such as electrical characteristics, transmission capacity, and voltage range of the electrical equipment 61, the electrical connection between the equipment, and protection control functions such as whether or not remote shutoff can be handled and overload protection. The information related to electrical circuit aspects also includes information related to measurements by sensors in the power system, such as the measurement target and measurement conditions of the measuring equipment 62, and the electrical connection of the measuring equipment 62. Furthermore, the system equipment configuration data 220 includes information related to economic aspects, such as the power generation cost of the generator and the operating cost of the measuring equipment 62.

[0076] Fig. 5 is a diagram showing an example of the configuration of the system equipment configuration data 220. In the system equipment configuration data 220 shown in Fig. 5, for each equipment ID 221 assigned to each of the electrical equipment 61 and the measuring equipment 62, a name 222, an operation period 223, information related to the electrical circuit aspect of each equipment, and information related to the economic aspect are specified as a set of data.

[0077] 5, the information relating to the electrical circuit aspect of each device includes a rated voltage 224, a minimum output 225, a maximum output 226, an output change rate 227, and remote shutdown availability 228. Also, the information relating to the economic aspect includes a power generation cost 229.

[0078] 5, for device ID "L001," the following information is specified as a set of data: name "Generator A," operation period "2026 / 06 / 28-2027 / 06 / 27," rated voltage "110 kV," minimum output "20 MW," maximum output "400 MW," output change rate "5.0% / min," remote shutoff availability information "No," and power generation cost "15,000 yen / MW." Note that operation period 223 indicates the period during which the corresponding device exists in the same state (operation period), and if the operation period 223 is shorter than the evaluation period (planning period) of the protection and control plan, it means that there is a plan for new installation, renewal, or decommissioning of the device, and the device will be changed.

[0079] In the system device configuration data 220, the contents of a set of data defined for each device ID 221 differ depending on the type of device. Furthermore, the system device configuration data 220 may define not only the configuration information of each device at a future target planning date and time, but also the configuration information of each device at a past date and time.

[0080] (3) Postulated accident data storage section The postulated accident data storage unit 23 stores (memorizes) postulated accident data 230 that defines information related to postulated failures, accidents, etc. in each of the electric devices 61 that constitute the power system.

[0081] Fig. 6 is a diagram showing an example of the configuration of the postulated accident data 230. In the postulated accident data 230 shown in Fig. 6, for each postulated accident ID 231 indicating the type of postulated accident, information such as the postulated accident name 232, the fault equipment 233, and the accident mode 234 (accident details) is specified as a set of data. Specifically, for the postulated accident ID "C001", information such as the name "Accident A", the fault equipment "Generator A", and the accident mode "Short circuit" is specified as a set of data.

[0082] The information specified in the fault facility 233 may include not only the name of the fault facility (electrical equipment 61) but also information such as the ID information and location of the fault facility. The information specified in the fault mode 234 includes information on the state of the expected failure or fault, but may also include information on the number of lines and phases in which the fault occurred. Furthermore, the expected fault data 230 may include information on items such as the risk of the expected fault (impact, loss cost, degree of danger, etc.) and the probability of occurrence.

[0083] In this embodiment, the above-mentioned contingent accident data 230 is input in advance by an operation of a user (planner), for example, and stored in the contingent accident data storage unit 23. Note that the contingent accident data 230 may be acquired from an external server (not shown) and stored in the contingent accident data storage unit 23.

[0084] (4) Normal control plan data storage section The normal state control plan data storage unit 24 stores (memorizes) normal state control plan data 240 created by the normal state control planning unit 12. The normal state control plan data 240 specifies various information related to protection and control modules that are executed during normal times so that the protection and control plan planning device 2 can put the power system into a predetermined normal state during the planning target period (future time).

[0085] Fig. 7 is a diagram showing an example of the configuration of the normal control plan data 240. In the normal control plan data 240 shown in Fig. 7, for each management ID 241 for identifying a protection control module to be used in normal control, that is, for each protection control module for normal control, information such as a module set ID 242, a planning target date and time 243, setting values ​​244 (244a, 244b, ...) of each generator to be controlled, and module data 245 is specified as a set of data.

[0086] Module set ID 242 is a management ID for a group of related modules that can be executed at the same date and time as the execution date and time of the protection control module of management ID 241. Therefore, the group of related modules managed by module set ID 242 includes a protection control module for normal control and a protection control module for post-event control that have the same planning target date and time.

[0087] The planning target date and time 243 is the date and time when the protection control module of the management ID 241 is executed. The setting value 244 (244a, 244b, ...) of each generator is the active power [MW] of the generator. Furthermore, the module data 245 is information (ID) for identifying the binary data (execution data) of the protection control module of the normal control of the management ID 241 that is actually executed by the power system protection control device 3.

[0088] In the example shown in Figure 7, for the management ID "MoN001" of the protection control module for normal control, information such as module set ID "G001", planning target date and time "2026 / 06 / 28 00:00", setting value "90" of the generator (generator A) with equipment ID "L001", setting value "20" of the generator (generator B) with equipment ID "L002", and module data "MoN001_b" is specified as a set of data.

[0089] 7 illustrates an example in which the setting values ​​244 (244a, 244b, ...) of each generator are defined as the setting values ​​of the electric devices 61 to be controlled defined in the normal state control plan data 240, but the present invention is not limited to this. For example, the setting values ​​of various other facilities (e.g., transformers, storage batteries, circuit breakers, switches, etc.) included in the power system or setting values ​​for a combination of various other facilities may be defined in the normal state control plan data 240 as the setting values ​​of the electric devices 61 to be controlled. Furthermore, in the example illustrated in FIG. 7, the setting value of the generator defined in the normal state control plan data 240 is the available power [MW], but it may also be a value of the generator's reactive power or voltage, or a combination of these values.

[0090] (5) Post-control range data storage section The post-control range data storage unit 25 stores post-control range data 250 created by the post-control range calculation unit 13. The post-control range data 250 specifies information on the range of adjustment (change) of constraint conditions under normal circumstances in the event of a postulated accident occurring during the planning period (future time), specifically, the range of adjustment (change) of controllable setting values ​​for the electrical devices 61.

[0091] Fig. 8 is a diagram showing an example of the configuration of the post-control range data 250. In the post-control range data 250 shown in Fig. 8, for each data management ID 251, information on the planning target date and time 252, the equipment ID 253, the controllable range of the set value (control settable range 254), the remote shutoff possibility 255 of the equipment (generator), and the shutoff possible amount 256 is specified as a set of data.

[0092] The control settable range 254 shown in Fig. 8 is a range of values ​​within which the generator's active power output can change in a positive or negative direction within one minute from the planning target date and time 252. The control settable range 254 is calculated, for example, from the output change rate 227 (see Fig. 5) defined in the system equipment configuration data 220 and the generator set value 244 (see Fig. 7) defined in the normal control plan data 240. For example, for generator A with facility ID "L001," the output change rate 227 is 5.0 [% / min] and the set value 244a at the planning target date and time "2026 / 06 / 28 00:00" is 90 [MW]. Therefore, the control settable range 254 for the management ID "R001" is 85.5 [MW] to 94.5 [MW], as shown in Fig. 8.

[0093] The interruptible capacity 256 is the active energy (MW) of the shuttable generator when the shuttable generator is shut down, and can be calculated, for example, from the generator remote shutoff availability 255 and the generator setting value 244 (see FIG. 7) in the normal state control plan data 240. For example, for generator A with facility ID "L001," the normal state setting value 244 at the planning target date and time "2026 / 06 / 28 00:00" is 90 MW, but the generator remote shutoff availability 255 is "no," so the interruptible capacity 256 is 0 MW, as shown in FIG. 8. Also, for generator B with facility ID "L002," the normal state setting value 244 at the planning target date and time "2026 / 06 / 28 00:00" is 20 MW, and the generator remote shutoff availability 255 is "yes," so the interruptible capacity 256 is 20 MW.

[0094] In the example shown in Figure 8, for management ID "R001", the following information is specified as a set of data: planning target date and time "2026 / 06 / 28 00:00", equipment ID "L001", control setting range "85.5 [MW] to 94.5 [MW]", remote shutoff possibility "No", and shutoff possible amount "0 [MW]". Also, in the example shown in Figure 8, for management ID "R002", the following information is specified as a set of data: planning target date and time "2026 / 06 / 28 00:00", equipment ID "L002", control setting range "19.4 [MW] to 20.6 [MW]", remote shutoff possibility "Yes", and shutoff possible amount "20 [MW]".

[0095] 8 illustrates an example in which the equipment (electrical equipment 61) to be controlled defined in the post-control range data 250 is a generator, but the present invention is not limited to this. The equipment to be controlled may be, for example, various other equipment included in the power system (e.g., a transformer, a storage battery, a circuit breaker, a switch, etc.), or a combination of various equipment. Furthermore, the control settable range 254, equipment remote shutoff possibility 255, and shutoff possible amount 256 defined in the post-control range data 250 are changed as appropriate depending on the equipment to be controlled.

[0096] (6) Post-control plan data storage section The post-control plan data storage unit 26 stores (memorizes) the post-control plan data 260 created by the post-control planning unit 14. The post-control plan data 260 specifies various information related to the protective control to be executed on the electrical equipment 61 when a postulated accident occurs during normal times (target planning date and time).

[0097] Fig. 9 is a diagram showing an example of the configuration of post-control plan data 260 at a predetermined planning date and time. In the post-control plan data 260 shown in Fig. 9, for each management ID 261 for identifying a protection control module used in post-control, i.e., for each protection control module in post-control, information on a module set ID 262, a protection control module name 263, a postulated accident ID 264, a protection control function type 265, protected equipment 266, protection control settings 267, and module data 268 is specified as a set of data.

[0098] The module set ID 262 is the module set ID 242 defined in the normal state control plan data 240 shown in FIG. 7. The protection control module name 263 is expressed in a simple expression that shows the processing overview and characteristics of the protection control module. For example, the "OLR" in the name "OLR*-*" shown in FIG. 9 is an abbreviation for overload relay. The postulated accident ID 264 is the postulated accident ID 231 defined in the postulated accident data 230 shown in FIG. 6.

[0099] The protection control function type 265 specifies information indicating the type of protection control performed when a postulated fault occurs, with the aim of preventing the fault from spreading, and the type of protection control (protective relay method) with the aim of eliminating the fault. Examples of types of protection control with the aim of preventing the fault from spreading include overload prevention, voltage abnormality prevention, frequency abnormality prevention, and loss of synchronism prevention. Also, examples of types of protection control (protective relay method) with the aim of eliminating the fault include overcurrent relay, directional distance relay, line selection relay, directional comparison relay, and current differential relay. The protected equipment 266 specifies information for specifying the target equipment or the range of target equipment to be protected or stabilized by the ex-post control protection control module.

[0100] The protection control setting 267 specifies information regarding the content of post-control to be executed for the protection target equipment 266 to achieve the purpose specified in the protection control function type 265. In the example shown in FIG. 9, the information of the protection control setting 267 specifies information on protection control operating conditions 267a, control target equipment 267b, and processing content 267c. Note that the control target equipment 267b is specified with the device ID 221 specified in the system device configuration data 220 shown in FIG. 5. Furthermore, the content of the various items specified in the protection control setting 267 can be changed as appropriate depending on the protection control function type 265 and the protection target equipment 266.

[0101] The module data 268 is information (ID) for identifying binary data (execution data) of the protection control module of the post-control of the management ID 261 that is actually executed by the power system protection control device 3.

[0102] In the example shown in Figure 9, the management ID of the ex-post control protection control module "MoP001" is "Module Set ID G001," name "OLR1-1," assumed fault ID "C001," protection control function type "overload prevention," protected equipment "Transmission Line B," protection control operating condition "Transmission Line A circuit breaker is in the 'open' state," controlled equipment "Generator B (ID: L002)," processing content "Shutdown (20 MW)," and module data "MoP001_b" are specified as a set of data. In this ex-post control protection control module with management ID "MoP001," if a short circuit (ID: C001) of Generator A occurs as a assumed fault, in order to prevent an overload of Generator B on Transmission Line B, control is performed to shut down Generator B when the circuit breaker of Transmission Line A is in the 'open' state.

[0103] 9, the ex-post control protection control module with management ID "MoP002" has the following set of data: module set ID "G001," name "OLR1-2," assumed fault ID "C002," protection control function type "overload prevention," protected equipment "transmission line A," protection control operating condition "load factor of transmission line A is 120% or more," controlled equipment "generator A (ID: L001)," processing content "change output to 85.5 (MW)," and module data "MoP002_b." In the ex-post control protection control module with management ID "MoP002," if a short circuit (ID: C002) of generator B occurs as a assumed fault, when the load factor of transmission line A exceeds 120%, in order to prevent an overload of transmission line A from generator A, the output (active power) of generator A is changed to 85.5 (MW).

[0104] In the post-control plan data 260 shown in FIG. 9, the module set ID 262 is "G001," and therefore the planning target date and time of this post-control plan data 260 is "2026 / 06 / 28 00:00" (see FIG. 7). The post-control plan data 260 shown in FIG. 9 may be configured to apply over a predetermined planning target period (multiple planning target dates and times). Therefore, the information items defined in the post-control plan data 260 may include items related to application periods, such as the planning target date and time and the planning target period.

[0105] (7) Reliability evaluation data storage unit The reliability evaluation data storage unit 27 stores (memorizes) reliability evaluation data 270 created by the plan evaluation unit 15. The reliability evaluation data 270 specifies information related to the evaluation of the reliability of the power system when a protection control module for post-control specified in the post-control plan data 260 is executed (simulated) when each postulated accident occurs at a predetermined target planning date and time.

[0106] Fig. 10 is a diagram showing an example of the configuration of reliability evaluation data 270 at a predetermined target planning date and time. In the reliability evaluation data 270 shown in Fig. 10, for each management ID 271 for identifying the evaluation result regarding reliability, information on a module set ID 272 to be evaluated, a postulated accident ID 273, a judgment 274, constraint violating equipment 275, and violation details 276 (specific information) is specified as a set of data.

[0107] The module set ID 272 to be evaluated is the module set ID 242 defined in the normal control plan data 240 shown in Fig. 7 and the module set ID 262 defined in the post-event control plan data 260 shown in Fig. 9. In addition, the postulated accident ID 264 is the postulated accident ID 231 defined in the postulated accident data 230 shown in Fig. 6.

[0108] Judgment 274 stores the judgment result ("OK" or "NG") as to whether the evaluation of the reliability of the power system when a specified anticipated accident occurs and a post-control protection control module corresponding to the specified anticipated accident specified in the post-control plan data 260 is executed satisfies the constraints regarding the specified reliability.

[0109] The "constraint conditions related to a predetermined reliability" include conditions related to the safety of power system facilities and the stability of supply, such as the load factor of a specific transmission line being less than a predetermined value, or the frequency at a specific point in the power system being within a predetermined range. The "constraint conditions related to a predetermined reliability" also include, for example, a condition for isolating a faulted section from the power system when an accident occurs in the power system. The "constraint conditions related to a predetermined reliability" also include, for example, a condition such as whether a specific circuit breaker operates within a predetermined time after an accident occurs.

[0110] In the constraint violating equipment 275, information for identifying equipment or locations that do not satisfy the constraint conditions is specified when the judgment 274 is "NG." Furthermore, in the violation details 276, when the judgment 274 is "NG," information for identifying the constraint conditions that are not satisfied, which is the cause of the judgment, and information indicating the degree or amount of deviation from the constraint conditions, etc., is specified. Note that when the judgment 274 is "OK," no information is specified in the constraint violating equipment 275 and the violation details 276 (see the data for management ID "RE001-2" in FIG. 10).

[0111] In the example shown in Fig. 10, the reliability evaluation result for management ID "RE001-1" is the reliability evaluation result in the event of a postulated fault with postulated fault ID "C001" (short circuit of generator A). For management ID "RE001-1," the following information is specified as a set of data: module set ID "G001" to be evaluated, postulated fault ID "C001," judgment "NG," protection violation equipment "transmission line B," and violation content "residual overload (110% / 100%)." Note that residual overload (110% / 100%) means that an overload state (load rate 110%) occurs relative to the rated capacity (load rate 100%) of the transmission line. In other words, in the reliability evaluation results for management ID "RE001-1," if a hypothetical accident with hypothetical accident ID "C001" occurs, even if the corresponding post-control protection module (the post-control protection module included in module set ID "G001") is executed, a deviation from the constraint condition regarding overload (constraint violation) will occur in transmission line B of the power system.

[0112] Furthermore, in the example shown in FIG. 10, the reliability evaluation result for management ID "RE001-2" is the reliability evaluation result in the event of a postulated accident with postulated accident ID "C002" (short circuit of generator B). For management ID "RE001-2", the following information is specified as a set of data: module set ID "G001" to be evaluated, postulated accident ID "C002", and judgment "OK". In other words, the reliability evaluation result for management ID "RE001-2" indicates that in the event of a postulated accident with postulated accident ID "C002", a deviation from the constraint condition (constraint violation) will not occur if the corresponding post-control protection module is executed.

[0113] In the reliability evaluation data 270 shown in FIG. 10, the module set ID 272 to be evaluated is "G001," and therefore the planning target date and time of this reliability evaluation data 270 is "2026 / 06 / 28 00:00" (see FIG. 7). Note that the application of the reliability evaluation data 270 shown in FIG. 10 may extend over a predetermined planning target period (plural planning target dates and times). Therefore, the information items defined in the reliability evaluation data 270 may include items related to the application period, such as the planning target date and time and the planning target period. Furthermore, the constraint violating equipment 275 and violation details 276 defined in the reliability evaluation data 270 shown in FIG. 10 can be changed as appropriate depending on the content of the constraint conditions and the type of equipment.

[0114] (8) Planning evaluation data storage section The plan evaluation data storage unit 28 stores (memorizes) plan evaluation data 280 created by the plan evaluation unit 15. The plan evaluation data 280 specifies information on the operation cost (efficiency) and reliability of a protection and control plan that combines normal control (preventive control) and post-control, which has been created over a planning period, specifically, a set (module set) of a protection and control module for normal control and a protection and control module for post-control.

[0115] Fig. 11 is a diagram showing an example of the configuration of plan evaluation data 280 for the planning period. In the plan evaluation data 280 shown in Fig. 11, for each management ID 281 for identifying the evaluation result of the protection and control plan that has been formulated, information on a module set ID 282 to be evaluated, a total power generation cost 283, and a reliability evaluation 284 is specified as a set of data.

[0116] The module set ID 282 to be evaluated is the module set ID 242 defined in the normal control plan data 240 shown in FIG. 7 and the module set ID 262 defined in the ex-post control plan data 260 shown in FIG.

[0117] The total power generation cost 283 specifies information about the cost required for power generation by a generator in the power system when a protection control module with a management ID 241 specified in the normal operation control plan data 240 corresponding to the module set ID 282 to be evaluated is executed at a specified planning date and time. The total power generation cost 283 is calculated based on the power generation cost 229 (see FIG. 5) specified in the system equipment configuration data 220 and the setting value 244 of each generator (see FIG. 7) specified in the normal operation control plan data 240. Note that data items for evaluating the operational efficiency and economic viability of the power system are not limited to the total power generation cost 283, and items such as the amount of output suppression of renewable energy power sources and the amount of power transmission loss in the power system, or combinations thereof, may be used as appropriate.

[0118] The reliability evaluation 284 specifies information about the reliability when a module set (protection control module for post-event control) specified by the module set ID 282 to be evaluated is executed in the event of various assumed accidents occurring at a predetermined target planning date and time. The information about the reliability evaluation 284 is obtained based on the judgment 274 for the same module set ID specified in the reliability evaluation data 270 shown in FIG.

[0119] In this embodiment, if all of the determinations 274 of the same module set ID 272 for each assumed accident defined in the reliability evaluation data 270 (see FIG. 10 ) are “OK,” the reliability evaluation 284 is determined to be “OK.” That is, if the reliability determinations 274 for all assumed accidents for a given module set ID 272 are “OK,” the reliability evaluation 284 is determined to be “OK.” On the other hand, if even one of the determinations 274 of the same module set ID 272 for each assumed accident defined in the reliability evaluation data 270 is “NG,” the reliability evaluation 284 is determined to be “NG.” Note that the method for determining the reliability evaluation 284 is not limited to this example and can be changed as appropriate depending on, for example, the standards for the reliability and efficiency of the target power system.

[0120] In the example shown in FIG. 11, the plan evaluation data 280 for management ID "E001" is an evaluation result when a post-control protection control module corresponding to module set ID "G001" is executed when various assumed accidents occur at a predetermined planning target date and time. In the plan evaluation data 280 for management ID "E001," the module set ID 282 for evaluation action is "G001," so the planning target date and time for management ID "E001" is "2026 / 06 / 28 00:00" (see FIG. 7). In the plan evaluation data 280 for management ID "E001," information on the module set ID "G001," total power generation cost "2 million yen," and reliability evaluation "NG" is specified as one set of data. In addition, in the module set with module set ID "G001", as shown in Figure 10, if at least assumed accident ID "C001" (short circuit in generator A) occurs, the reliability judgment 274 will be "NG", and therefore the reliability evaluation 284 for management ID "E001" shown in Figure 11 will be "NG".

[0121] In the example shown in FIG. 11 , the plan evaluation data 280 for the management ID “E002” is an evaluation result of executing a post-control protection control module corresponding to the module set ID “G002” when various postulated accidents occur at a specific planning target date and time. In the plan evaluation data 280 for the management ID “E002,” the module set ID 282 for evaluation and response is “G002,” so the planning target date and time for the management ID “E002” is “2026 / 06 / 28 00:30” (see FIG. 7 ). In the plan evaluation data 280 for the management ID “E002,” the module set ID “G002,” the total power generation cost “2.05 million yen,” and the reliability evaluation “OK” are specified as a set of data. That is, for the module set with the evaluation module set ID “G002,” the reliability judgment 274 is “OK” for all postulated accidents, meaning that the module set can respond to all postulated accidents.

[0122] 11 may be applied over a predetermined planning period (plural planning dates and times). Therefore, the information items defined in the plan evaluation data 280 may include items related to the application period, such as the planning date and time and the planning period.

[0123] (9) Constraint Condition Adjustment Data Storage Unit The constraint condition adjustment data storage unit 29 stores constraint condition adjustment data 290 created by the constraint condition adjustment unit 17. The constraint condition adjustment data specifies information regarding addition or change (adjustment) of constraint conditions in the formulation of a protection and control plan for normal times (normal time control plan data 240).

[0124] Fig. 12 is a diagram showing an example of the configuration of constraint condition adjustment data 290 at a predetermined planning target date and time. In the constraint condition adjustment data 290 shown in Fig. 12, for each management ID 291 for identifying information on the constraint condition to be added or changed (adjusted), information on a countermeasure deviation case ID 292, equipment 293 to be changed (adjusted) in the constraint condition, and additional constraint condition 294 is specified as a set of data.

[0125] The dealt with deviation case ID 292 specifies information for identifying the evaluation result of the deviation case (postulated accident) to be dealt with by adding or changing (adjusting) constraint conditions, specifically, the management ID 271 specified in the reliability evaluation data 270 shown in Fig. 10. Also, the constraint condition change target equipment 293 specifies ID information of the target equipment to which the constraint conditions are added or changed (adjusted), specifically, the equipment ID 221 specified in the system equipment configuration data 220 shown in Fig. 5.

[0126] Information on constraint conditions to be added or changed (adjusted) in normal control at a predetermined planning target date and time is specified in the additional constraint conditions 294. Specifically, the additional constraint conditions 294 specify change information on the setting values ​​244 (generator settings in FIG. 7) of the equipment (electrical equipment 61) to which constraint conditions are to be added or changed (adjusted), which is specified in the normal control plan data 240 shown in FIG. 7.

[0127] In the constraint condition adjustment data 290 of the management ID "CH001" shown in Fig. 12, an additional constraint condition 294 is specified to deal with the violation content "residual overload violation" in the event of the assumed accident (short circuit of generator A) of the assumed accident ID "C001" specified in the reliability evaluation data 270 shown in Fig. 10. Specifically, for the management ID "CH001", the information of the dealt with deviation case ID "RE001-1", the equipment to be changed (adjusted) "L002 (generator B)", and the additional constraint condition "output set value (active power set value) = 30 MW or more" is specified as a set of data.

[0128] The additional constraint condition 294 for the response deviation case ID "RE001-1" (residual overload violation) shown in FIG. 12 can be obtained by calculating the additional amount of power to be cut off to resolve the residual overload violation from the violation details 276 (residual overload amount) shown in FIG. 10, the cutoff amount 256 (amount of overload resolved by cutting off the generator) shown in FIG. 8, etc.

[0129] Specifically, in the example shown in FIG. 10, the residual overload is 10% (=110%-100%), and the amount of overload eliminated by shutting off generator B is 20 MW (see FIG. 8). Assume here that the percentage of the overload eliminated when shutting off 20 MW of generator output by shutting off generator B (equipment ID "L002") during execution of the post-control protection module with management ID "MoP001" specified in the post-control plan data 260 shown in FIG. 9 is 20%. In this case, the overload elimination effect coefficient, which is the percentage of generator output [MW] required to eliminate 1% of the overload, is 1 MW / % (=20 MW / 20%). Therefore, the additional power shutoff amount required to eliminate 10% of the residual overload is 10 MW (=1 MW / % × 10%).

[0130] That is, in order to resolve the residual overload violation of the response deviation case ID "RE001-1" (when the postulated accident with postulated accident ID "C001" occurs), the output of generator B needs to be set to 30 MW (= 20 MW + 10 MW) or more. From this calculation result, the constraint condition adjustment data 290 shown in FIG. 12 specifies the information "output set value = 30 MW or more" in the additional constraint condition 294.

[0131] The additional constraints determined by the constraint condition adjustment unit 17 are not limited to the example shown in Fig. 12, and may be constraints related to setting values ​​for determining the power flow state of the power system, such as upper and lower limit constraints on the power flow of a power transmission line and upper and lower limit constraints on a bus voltage, for example, in power flow calculations and transient calculations. The constraint condition adjustment data 290 shown in Fig. 12 may be applied over a predetermined planning period (a plurality of planning target dates and times). Therefore, the information items specified in the constraint condition adjustment data 290 may include items related to the application period, such as the planning target dates and times and the planning target period. The data items specified in the constraint condition adjustment data 290 are changed as appropriate depending on the type of the change target facility 293.

[0132] [Protection and control plan formulation process flow] Next, a specific processing flow of the protection and control plan formulation process executed by the protection and control plan formulation device 2 will be described with reference to Fig. 13. Fig. 13 is a flowchart showing the steps of the protection and control plan formulation process executed by the processing unit 10 of the protection and control plan formulation device 2. Note that the protection and control plan formulation process shown in Fig. 13 is executed on software by an arithmetic function unit such as a CPU that constitutes the processing unit 10. Also, the protection and control plan formulation process shown in Fig. 13 is repeatedly executed for each target date and time for formulation.

[0133] First, the processing unit 10 (future system generation unit 11) generates a power system simulated environment for a predetermined planning target date and time (S1). In this process, the processing unit 10 generates the power system simulated environment for the predetermined planning target date and time based on the system status data 210 (status measurement data 210a, device setting data 210b, and device status data 210c: see FIGS. 2 to 4) and the system device configuration data 220 (see FIG. 5).

[0134] Specifically, in the process of S1, the future system generation unit 11 uses existing technology to integrate specified equipment into the system equipment configuration data 220 to generate an electric circuit, and extracts the power generation amount, load amount, equipment setting status, operation status, etc. from the system status data 210 and reflects them in the electric circuit. In this way, a power system simulation environment (power system model) is generated that makes it possible to simulate the electric circuit characteristics at the specified target planning date and time.

[0135] Next, the processing unit 10 (normal state control planning unit 12) creates (plans) a normal state control plan for a specified target planning date and time based on the normal state constraint conditions currently set for the various facilities (electrical equipment 61) to be controlled (S2).

[0136] In the process of S2, the normal operation control planning unit 12 performs calculations such as power flow calculations and transient calculations on the power system simulated environment using the currently set normal operation constraint conditions. Then, within a range that satisfies the normal operation constraint conditions, the normal operation control planning unit 12 calculates the power flow state that optimizes a predetermined performance index and the setting values ​​of various facilities (electrical devices 61) to be controlled, which are normal operation control parameters for realizing that power flow state. This creates a normal operation control plan, specifically, normal operation control plan data 240 (see FIG. 7).

[0137] If the process of S2 is performed immediately after the process of S1, the normal-time control plan is created using the preset initial constraint conditions for normal times as the constraint conditions for normal times in the process of S2. On the other hand, if the process of S2 is performed immediately after the process of S9 described below, the normal-time control plan is created using the normal-time constraint conditions after the change (adjustment) made in the process of S9 described below.

[0138] Next, the processing unit 10 (post-control range calculation unit 13) calculates (S3) the adjustment ranges of the set values ​​of various facilities at the time of the occurrence of an accident at a predetermined planning date and time based on the normal state control plan data 240 (see FIG. 7) generated in the processing of S2 and the system status data 210 (see FIGS. 2 to 4). By this processing, post-control range data 250 (see FIG. 8) is created.

[0139] Next, the processing unit 10 (post-control planning unit 14) creates (drafts) a post-control plan for each assumed accident (S4).

[0140] In the process of S4, first, the post-control planning unit 14 simulates the power system state (system state at the time of an accident) when each post-conditional accident occurs at a predetermined planning date and time in a power system simulation environment based on the post-conditional accident data 230 (see FIG. 6) and the normal-state control plan data (see FIG. 7). Next, the post-control planning unit 14 extracts, based on the simulation results, accident cases requiring action that do not satisfy predetermined constraints related to reliability. Then, based on the post-control range data 250 (see FIG. 8), the post-control planning unit 14 determines, using a predetermined algorithm, equipment settings (protection control settings 267 in FIG. 9) that optimize the evaluation criteria for accident cases requiring action, and creates post-control plan data 260 (see FIG. 9). Note that the equipment settings determined at this time are settings that optimize the evaluation criteria for accident cases requiring action, but are not necessarily settings that satisfy the predetermined constraints related to reliability.

[0141] Next, the processing unit 10 (plan evaluation unit 15) calculates the operating cost of the power system when the normal operation control plan (protection module in normal operation) is executed at a predetermined target planning date and time (S5). In this process, the plan evaluation unit 15 calculates the operating cost of the power system when the normal operation control plan is executed based on the power generation cost 229 (see FIG. 5) specified in the system equipment configuration data 220 and the setting value 244 of each generator (see FIG. 7) specified in the normal operation control plan data 240.

[0142] Next, the processing unit 10 (plan evaluation unit 15) evaluates the reliability when the post-fault protection and control plan (post-fault control plan data 260) is executed for each postulated fault (S6). In this process, the plan evaluation unit 15 determines whether the evaluation of the reliability of the power system when the post-fault protection and control module specified in the post-fault control plan data 260 (see FIG. 9) is executed for each postulated fault satisfies the predetermined constraint conditions related to reliability. Then, in this process, the plan evaluation unit 15 creates reliability evaluation data 270 (see FIG. 10) that specifies the obtained reliability evaluation result ("OK" or "NG"), constraint-violating equipment that does not satisfy the constraint conditions, and information on the violation details (such as the degree and amount of deviation from the constraint conditions).

[0143] Next, the processing unit 10 (plan evaluation unit 15) evaluates the reliability of the plans (normal control plans and ex-post control plans) when each postulated accident occurs at a predetermined planning target date and time (S7).

[0144] In the process of S7, the plan evaluation unit 15 evaluates the reliability of a protection control plan (module set) that combines currently planned preventive control (normal control plan) and post-control (post-control plan) for the occurrence of each assumed accident. Also, in the process of S7, the plan evaluation unit 15 generates plan evaluation data 280 (see FIG. 11) that specifies the operating cost of the power system and information on the reliability evaluation of the planned plan.

[0145] In this embodiment, as described above, if all of the judgments 274 of the same module set ID 272 for each assumed accident specified in the reliability evaluation data 270 (see FIG. 10) are "OK" (if all assumed accidents can be handled), the reliability evaluation of the drafted plan (module set) is "OK." On the other hand, if even one of the judgments 274 of the same module set ID 272 for each assumed accident specified in the reliability evaluation data 270 is "NG," the reliability evaluation of the drafted plan is "NG."

[0146] Next, the processing unit 10 (evaluation determination unit 16) determines whether or not the reliability evaluation of the formulated plan is "OK" based on the plan evaluation data 280 (see FIG. 11) generated in the process of S7 (S8).

[0147] In S8, if the evaluation judgment unit 16 judges that the reliability evaluation of the drafted plan is not "OK" (if S8 is judged as NO), that is, if a post-control plan that satisfies the constraint conditions cannot be drafted, the processing unit 10 (constraint condition adjustment unit 17) changes (adjusts) the constraint conditions of the protection control plan during normal times (S9).

[0148] In the process of S9, first, the constraint condition adjustment unit 17 identifies (extracts) a drafted plan (module set ID 282 to be evaluated) for which the reliability evaluation 284 is "NG" based on the plan evaluation data 280 (see FIG. 11). For example, in the plan evaluation data 280 shown in FIG. 11, a drafted plan (module set) with a module set ID "G001" is identified. Next, the constraint condition adjustment unit 17 refers to the reliability evaluation data 270 (see FIG. 10) and extracts information on constraint violating equipment 275 for which the reliability judgment 274 is "NG" and the violation details 276 thereof in the identified drafted plan (module set). For example, in the reliability evaluation data 270 shown in FIG. 10, constraint violating equipment "transmission line B" with management ID "RE001-1" and the violation details "residual overload (110% / 100%)" are extracted. Then, the constraint condition adjustment unit 17 generates constraint condition change (adjustment) data for the constraint violating equipment 275 to improve the reliability judgment 274 of the extracted constraint violating equipment 275 to "OK", i.e., constraint condition adjustment data 290 (see FIG. 12). For example, in the constraint condition adjustment data 290 shown in FIG. 12, "output set value=30 MW or more" is generated as an additional constraint condition 294 to resolve the constraint violation (residual overload) of the treatment deviation case ID "RE001-1".

[0149] After the process of S9, the processing unit 10 (constraint condition adjustment unit 17) returns the process to the process of S2 and executes the processes from S2 onwards. In this case, in the processes from S2 onwards, the normal-state control plan data 240, the post-control range data 250, and the post-control plan data 260 are changed based on the constraint condition adjustment data 290. Specifically, in the normal-state control plan data 240, the post-control range data 250, and the post-control plan data 260, information related to the constraint conditions is rewritten so that the constraint condition adjustment data 290 reflects the changes to the constraint conditions specified.

[0150] The above-mentioned process of changing (adjusting) the constraint conditions during normal times, and the process of changing (adjusting) the normal time control plan data 240, the post-control range data 250, and the post-control plan data 260 based on the constraint condition adjustment data 290 are repeated until S8 is judged as YES, i.e., until the reliability evaluation of the drafted plan (the module set to be evaluated) is "OK."

[0151] Here, an example of the configuration of the normal-state control plan data 240, the post-control range data 250, and the post-control plan data 260 that have been changed (adjusted) based on the constraint condition adjustment data 290 (see FIG. 12) created in the process of S9 will be described with reference to FIGS. 14 to 16. Note that FIGS. 14, 15, and 16 are diagrams showing the configurations of the normal-state control plan data 240, the post-control range data 250, and the post-control plan data 260, respectively, in which the changed (adjusted) constraint conditions are reflected. Here, the configurations of the normal-state control plan data 240, the post-control range data 250, and the post-control plan data 260 before the change are assumed to be the configurations shown in FIGS. 7, 8, and 9, respectively. Here, an example will be described in which the constraint condition adjustment data 290 is the example shown in FIG. 12, i.e., the additional constraint condition 294 for the equipment ID "L002 (generator B)" to be changed is "output set value = 30 MW or more."

[0152] In this case, in the normal control plan data 240, as shown in the underlined portion in FIG. 14, the set value 244b of the equipment ID "L002 (generator B)" associated with the module set ID "G001" is changed from "20 MW" to "30 MW." In the post-control range data 250, as shown in the underlined portion in FIG. 15, the control settable range 254 associated with the equipment ID "L002 (generator B)" is changed from "19.4 MW to 20.6 MW" to "29.1 MW to 30.9 MW." Furthermore, in the post-control range data 250, the interruptable amount 256 associated with the equipment ID "L002 (generator B)" is changed from "20 MW" to "30 MW." Furthermore, in the post-control plan data 260, as shown in the underlined part in Figure 16, the information of the processing content 267c associated with the module set ID "G001" and the controlled equipment "L002 (generator B)" is changed from "Shutdown (20 MW)" to "Shutdown (30 MW)."

[0153] Returning to the description of the processing of S8, if the evaluation and determination unit 16 determines in S8 that the reliability evaluation of the planning plan is "OK" (if S8 returns a YES judgment), the processing unit 10 performs processing to output the currently set normal control plan data 240 and post-control plan data 260, i.e., the planning data for the finally confirmed normal control plan and post-control plan (S10). In this processing, the processing unit 10 transmits the normal control plan data 240 and the post-control plan data 260 to the power system protection and control device 3 via the communication unit 31 and also outputs them to the output unit 33. When the normal control plan data 240 and the post-control plan data 260 are output to the output unit 33, the finally confirmed normal control plan and post-control plan are displayed on the display screen of the display device included in the output unit 33. After processing of S10, the processing unit 10 terminates the protection and control plan planning processing for the predetermined planning target date and time.

[0154] After the protection and control plan formulation process by the protection and control plan formulation device 2 described above is completed, the power system protection and control device 3 receives information about the protection and control modules defined in the normal state control plan data 240 and the post-event control plan data 260, and executes the protection and control modules as appropriate depending on the situation, and performs physical operations on each electrical device 61, such as changing a transformer tap or opening and closing a circuit breaker.

[0155] [Display mode of proposed plan] 17 and 18, an example of the display mode of the normal-state control plan data 240 and the post-control plan data 260 on the display device included in the output unit 33 will be described. Fig. 17 is a diagram showing the display mode of the normal-state control plan data 240 on the display device, and Fig. 18 is a diagram showing the display mode of the post-control plan data 260 on the display device. It is assumed here that the normal-state control plan data 240 shown in Fig. 14 and the post-control plan data 260 shown in Fig. 16 are the drafting data for the finally confirmed normal-state control plan and the post-control plan.

[0156] When the normal state control plan data 240 shown in Fig. 14 is output from the processing unit 10 to the output unit 33, an image 41 of the normal state control plan corresponding to the normal state control plan data 240 shown in Fig. 14 can be displayed on the display screen 40 of the display device, as shown in Fig. 17. The display screen 40 for the image 41 of the normal state control plan is called up and displayed from a menu screen (not shown). The display screen 40 may display a part of the normal state control plan data 240, or may also display data that is not included in the normal state control plan data 240.

[0157] 16 is output from the processing unit 10 to the output unit 33, an image 42 of the post-control plan corresponding to the post-control plan data 260 shown in Fig. 16 can be displayed on the display screen 40 of the display device, as shown in Fig. 18. The display screen 40 of the image 42 of the post-control plan is called up and displayed from a menu screen (not shown). The display screen 40 may display only a portion of the post-control plan data 260, or may also display data not included in the post-control plan data 260.

[0158] Furthermore, the display screen 40 may display a [Change] button that allows a part of the display screen 40 to be changed by a user operation, a [Back] button for closing the display screen 40 and returning to the menu screen from which it was called, etc. Also, in the above example of the display mode, an example has been described in which the image 41 of the normal control plan and the image 42 of the post-control plan are displayed separately on the display screen 40, but both images may be displayed simultaneously on the display screen 40.

[0159] [Various effects] As described above, in the protection and control plan formulation device 2 of this embodiment, at the formulation stage, the process of changing (adjusting) the normal state control plan and the post-event control plan is repeated based on the constraint condition adjustment data 290 changed (adjusted) by the constraint condition adjustment unit 17, until the reliability evaluation results for all assumed accidents satisfy the predetermined standard ("OK" judgment) by simulating the power system simulation environment (power system model).

[0160] That is, in this embodiment, when an accident occurs, an optimal protection and control plan can be created by taking into consideration not only the normal control plan but also changes to the ex-post control plan. Therefore, even if various situation changes occur in the power system, the protection and control plan creation device 2 of this embodiment can create a protection and control plan with necessary and sufficient preventive control while satisfying dynamic constraints on reliability.

[0161] Furthermore, in this embodiment, compared to a configuration that addresses the issue by simply changing the normal control plan (preventive control) to meet a predetermined reliability, changes to the normal control plan, which would otherwise increase unnecessary operating costs, can be minimized. Therefore, excessive preventive control can be avoided, and operating costs can be reduced.

[0162] From the above, the protection and control plan development device 2 of this embodiment can develop a protection and control plan that combines preventive control and reactive control, while satisfying dynamic constraints on reliability and having low operating costs.

[0163] As a result, the protection and control planning device 2 of this embodiment can respond to short-term system changes with necessary and sufficient equipment, and can achieve efficient system operation while ensuring reliability. Furthermore, in this case, it is possible to avoid problems such as limiting the amount of power generated by economical generators such as renewable energy sources.

[0164] [Various variations] Although the protection and control plan development device 2 and the protection and control plan development method according to one embodiment of the present invention have been described above, the present invention is not limited thereto. For example, the following various modified examples can be adopted, and the same effects as those of the above embodiment can be obtained in the following various modified examples.

[0165] (1) Variation 1 In the above embodiment, a configuration example was described in which both the normal control plan and the post-control plan are changed (adjusted) based on the constraint condition adjustment data 290 (proposed changes to the constraint conditions) created by the constraint condition adjustment unit 17, but the present invention is not limited to this.

[0166] For example, depending on the violation details (specific information) in the evaluation results for each anticipated accident, one of the following three countermeasures (A) to (C) may be selected as a countermeasure to resolve the violation details, and a plan to be subject to change (adjustment) of the constraint conditions may be selected. (A) A method of dealing with the problem by changing normal controls. (B) How to address the issue by changing post-event controls. (C) A method of taking action by combining changes in normal control and changes in post-event control (the method of the above embodiment).

[0167] In this case, for accidents that can be dealt with by changing the post-event control, the constraint violation can be resolved by changing only the post-event control plan without changing the normal control plan. In this case, unnecessary operating costs can be further reduced. Note that the violation content that is the target for switching the response method is set appropriately depending on, for example, the configuration, scale, etc. of the power system to be controlled.

[0168] Furthermore, as a method for selecting the above-mentioned countermeasure method, an importance index of the assumed accident based on the risk and occurrence probability of the assumed accident may be calculated, and one of the countermeasure methods (A) to (C) may be selected depending on the magnitude of the importance index of the assumed accident. Note that the importance index to be used for switching the countermeasure method may be set appropriately depending on, for example, the configuration, scale, etc. of the power system to be controlled.

[0169] In this case, for example, a contingency with a low importance index can be addressed by changing the ex-post control plan, and only a contingency with a high importance index can be addressed by changing the normal control plan. Therefore, a contingency with a low importance index can be addressed by changing only the ex-post control plan, and there is no need to change the normal control plan, which further reduces the increase in operating costs.

[0170] Here, a brief description will be given of the configuration of the protection and control planning device and protection and control planning method of Modification 1. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals.

[0171] In the configuration of the protection and control plan drafting device of Modification 1, the constraint condition adjustment unit 17 can perform the process of selecting either or both of the normal control plan and the ex-post control plan as the plan for which the constraint conditions are to be changed, based on the various selection criteria described above. In addition, a functional unit (change target plan selection unit) for executing the process of selecting the plan for which the constraint conditions are to be changed may be provided in the processing unit 10 separately from the constraint condition adjustment unit 17.

[0172] 19 is a flowchart showing the steps of a protection control plan formulation process executed by the processing unit 10 of the protection control plan formulation device of Modification 1. The protection control plan formulation process shown in FIG. 19 is repeatedly executed for each target planning date and time. The contents of the processes of S21 to S29 and S31 in the protection control plan formulation process of Modification 1 shown in FIG. 19 are the same as the processes of S1 to S9 and S10 in the protection control plan formulation process of the above embodiment described in FIG. 13. Therefore, detailed descriptions of these processes will be omitted here.

[0173] In the first modification, after the processing unit 10 (constraint condition adjustment unit 17) performs a process of changing (adjusting) the constraint conditions during normal operation (S29), the processing unit 10 (constraint condition adjustment unit 17) selects a plan for which the constraint conditions are to be changed (S30). In this process, the constraint condition adjustment unit 17 selects either or both of the normal operation control plan and the ex-post control plan as the plans for which the constraint conditions are to be changed, based on the various selection criteria described above (for example, the violation content or the importance index of the anticipated accident). Then, after the process of S30, the processing unit 10 returns the process to the process of S22 and repeats the processes from S22 onwards.

[0174] However, if both the normal control plan and the post-control plan (the above-mentioned handling method (C)) are selected in the processing of S30, the processing from S22 onwards is performed in the same manner as in the above-mentioned embodiment. Also, if the normal control plan (the above-mentioned handling method (A)) is selected in the processing of S30, in the processing from S22 onwards, the constraint change (adjustment) information (constraint condition adjustment data 290) obtained in the processing of S29 is reflected only in the normal control plan (normal control plan data 240). Note that in this case, the post-control range data 250 and the post-control plan data 260 related to the post-control plan are not changed. Furthermore, if the post-control plan (the above-mentioned handling method (B)) is selected in the processing of S30, in the processing from S22 onwards, the constraint change (adjustment) information (constraint condition adjustment data 290) obtained in the processing of S29 is reflected in the post-control range data 250 and the post-control plan data 260 related to the post-control plan. In this case, the normal control plan (normal control plan data 240) is not changed.

[0175] (2) Variation 2 In the above embodiment, the future system generation unit 11 generates one power system simulated environment at a predetermined planning target date and time and creates an optimal protection and control plan for one predicted future power system state. However, the present invention is not limited to this. For example, the future system generation unit 11 may generate multiple power system simulated environments by changing some of the information included in the system state data 210 and the system equipment configuration data 220, and perform protection and control plan creation processing for each of the multiple future power system states. Specifically, the future system generation unit 11 may generate multiple power system simulated environments in which the output power amount at the output point of a renewable energy power source is changed to a maximum value, a minimum value, or an intermediate value between these values, or multiple power system simulated environments in which environmental information such as temperature is changed, and perform protection and control plan creation processing for each of the multiple future power system states.

[0176] In this case, the processing unit 10 of the protection and control plan formulation device 2 performs simulations for each of the multiple power system simulated environments and formulates protection and control plans in the same manner as in the above embodiment, so that multiple protection and control plans that are optimal for each of the multiple power system simulated environments are ultimately formulated. The formulated multiple protection and control plans are then transmitted to the power system protection and control device 3. The power system protection and control device 3 then receives the multiple protection and control plans and selects and executes a predetermined protection and control plan from the multiple protection and control plans in accordance with the state of the power system electrical device 4.

[0177] The protection and control planning device 2 of the above-described second modification can flexibly respond to various situations in the power system, and in particular can more appropriately respond to a power system that includes a renewable energy power source whose output can fluctuate in a short period of time.

[0178] Here, a brief description will be given of the protection and control planning process executed by the protection and control planning device of Modification 2. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals.

[0179] Fig. 20 is a flowchart showing the steps of a protection and control plan formulation process executed by the processing unit 10 of the protection and control plan formulation device 2 of Modification 2. The protection and control plan formulation process shown in Fig. 20 is repeatedly executed for each target date and time for formulation.

[0180] In this example, first, the processing unit 10 (future system generation unit 11) generates a plurality of power system simulated environments at a predetermined target planning date and time (S41). In this process, the processing unit 10 changes part of the information included in the system status data 210 (see FIGS. 2 to 4) and the system equipment configuration data 220 (FIG. 5) at the predetermined target planning date and time to generate a plurality of power system simulated environments.

[0181] Next, the processing unit 10 (normal state control planning unit 12) selects a predetermined power system simulated environment that has not yet been selected from the plurality of power system simulated environments (S42).

[0182] Next, the processing unit 10 creates (drafts) and evaluates a normal state control plan (normal state control plan data 240) and a post-control plan (post-control plan data 260) for a predetermined power system simulated environment (S43). In this process, the processing unit 10 performs the processes of S2 to S9 in the protection and control plan drafting process of the above embodiment described with reference to Fig. 13, and when the result of the determination process of S8 is YES, the process of S43 ends.

[0183] Next, the processing unit 10 determines whether or not all of the power system simulated environments have been selected (S44). If the processing unit 10 determines in S44 that all of the power system simulated environments have not been selected (if the determination in S44 is NO), the processing unit 10 returns the process to S42 and performs the processes from S42 onwards.

[0184] On the other hand, if the processing unit 10 determines in S44 that all power system simulated environments have been selected (if S44 is determined as YES), the processing unit 10 outputs the created multiple protection and control plans (normal control plans and post-control plans) (S45). In this process, the processing unit 10 outputs the planning data of the multiple protection and control plans (normal control plan data 240 and post-control plan data 260) to the output unit 33 and also transmits it to the power system protection control device 3 via the communication unit 31. Then, after the process of S45, the processing unit 10 ends the protection and control plan planning process in Modification 2.

[0185] (3) Other In the protection and control plan formulation process (FIG. 13) of the above embodiment, an example has been described in which the process of determining whether or not to make the protection and control plan the final one (the process of S8) is performed based on the reliability evaluation result ("OK" or "NG") in the plan evaluation data 280 (see FIG. 11). However, the present invention is not limited to this.

[0186] For example, the process of determining whether or not to make a protection control plan final (the process of S8) may be performed taking into consideration not only the result of the reliability evaluation 284 specified in the plan evaluation data 280 (see FIG. 11) but also the total power generation cost 283 (operation cost). In this case, for example, weights may be set for each of the reliability evaluation 284 and the total power generation cost 283, and the process of determining whether or not to make a protection control plan final (the process of S8) may be performed based on the combination of the weighted reliability evaluation 284 and the total power generation cost 283. In this case, it is possible to create a protection control plan that places more emphasis on operation cost than in the above embodiment.

[0187] In the above embodiment, the protective control function type 265 specified in the ex-post control plan data 260 can be set with information on both the type of protective control intended to prevent the spread of an accident when a hypothetical accident occurs and the type of protective control intended to remove the accident. That is, a configuration has been described in which a common setting parameter (protective control function type 265) is provided for protective control type information corresponding to both purposes. However, the present invention is not limited to this.

[0188] The protective control function type 265 specified in the ex-post control plan data 260 may be configured to set only one of the types of protective control intended to prevent the spread of a fault when a fault occurs and the types of protective control intended to clear the fault, depending on the configuration of the power system to be protected and controlled. Also, for example, a setting parameter for the type of protective control intended to prevent the spread of a fault and a setting parameter for the type of protective control intended to clear the fault may be provided separately, and both setting parameters may be specified in the ex-post control plan data 260.

[0189] In the above embodiment, an example has been described in which the finally determined normal control plan and post-control plan are displayed on the display device of the output unit 33 (see FIGS. 17 and 18 ). However, the present invention is not limited to this. For example, various data created during the process (planning process) until the final normal control plan and post-control plan are determined may also be displayed on the display device of the output unit 33. Specifically, one or more of the post-control range data 250 shown in FIG. 8 , the reliability evaluation data 270 shown in FIG. 10 , the plan evaluation data 280 shown in FIG. 11 , and the constraint adjustment data 290 shown in FIG. 12 may be displayed on the display device of the output unit 33.

[0190] The above-described embodiments provide detailed and specific descriptions of the device configuration to facilitate understanding of the present invention, and are not necessarily limited to devices that include all of the described components. The position, size, shape, and range of each component shown in the drawings may not represent the actual position, size, shape, and range in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, and range disclosed in the drawings. Furthermore, some of the configurations of the above-described embodiments may be added, deleted, or replaced with other configurations. Furthermore, the illustrated control lines and information lines are those considered necessary for explanation, and do not necessarily represent all control lines and information lines in the actual product. In reality, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0191] 1...power system protection and control system, 2...protection and control plan drafting device, 3...power system protection and control device, 4...power system electrical equipment, 5...first communication network, 6...second communication network, 10...processing unit, 11...future system generation unit, 12...normal control plan unit, 13...post-control range calculation unit, 14...post-control plan unit, 15...plan evaluation unit, 16...evaluation and judgment unit, 17...constraint condition adjustment unit, 20...recording unit, 21...system state data storage unit, 22...system equipment configuration data storage unit, 23...assumed accident data storage unit, 24...normal control plan data storage unit, 25...post-control range data storage unit, 26...post-control plan data storage unit, 27...reliability evaluation data storage unit, 28...plan evaluation data storage unit, 29...constraint condition adjustment data storage unit, 31...communication unit, 32...input unit, 33...output unit, 50...protection and control module, 61...electrical equipment, 62...measuring equipment

Claims

1. a predicted state generating unit for generating a future predicted state of the power system; a first protection and control plan formulation unit that formulates a first protection and control plan for the power system, the first protection and control plan satisfying constraints on control of the power system based on the predicted state of the power system generated by the predicted state generation unit; a second protection and control plan formulation unit capable of formulating a second protection and control plan for the power system that satisfies the constraint conditions in the event of an anticipated accident occurring in the predicted state of the power system generated by the predicted state generation unit; and a planning plan modification unit that creates predetermined information related to the constraint conditions for modifying plan contents of at least one of the first protection control plan and the second protection control plan when the second protection control plan formulation unit is unable to formulate the second protection control plan that satisfies the constraint conditions. Protection and control planning device.

2. a controllable range calculation unit that calculates a controllable range of each facility included in the power system when the assumed accident occurs in the predicted state of the power system, The second protection and control plan formulation unit is capable of formulating a second protection and control plan for the power system based on the controllable range of each facility included in the power system calculated by the controllable range calculation unit. The protection and control planning device according to claim 1 .

3. The controllable range calculation unit is capable of changing the controllable range of the equipment related to the change in the plan content when the predetermined information is created by the planning plan change unit. The protection and control planning device according to claim 2.

4. A plan evaluation unit that evaluates whether the reliability of the second protection and control plan in the event of the assumed accident satisfies a predetermined standard, The planning and modification unit is capable of creating the predetermined information based on the evaluation result of the plan evaluation unit. The protection and control planning device according to claim 1 .

5. the plan evaluation unit calculates an operating cost of the power system when the first protection and control plan is executed in the predicted state of the power system; The planning and modification unit is capable of creating the predetermined information based on the evaluation result of the plan evaluation unit and the operation cost of the power system calculated by the plan evaluation unit. The protection and control planning device according to claim 4.

6. When the reliability of the second protection and control plan does not satisfy the predetermined standard, the plan evaluation unit extracts specific information regarding the cause thereof, The planning plan modification unit selects one or both of the first protection and control plan and the second protection and control plan as a protection and control plan that reflects the predetermined information based on the specific information. The protection and control planning device according to claim 4.

7. The second protection and control plan defines at least one of setting information for control aimed at eliminating the assumed accident and setting information for control aimed at preventing the spread of the assumed accident. The protection and control planning device according to claim 1 .

8. the predicted state generating unit generates a plurality of types of future predicted states of the power system; The first protection and control plan formulation unit formulates a plurality of types of first protection and control plans respectively corresponding to the plurality of types of predicted states, The second protection and control plan formulation unit is capable of formulating a plurality of types of second protection and control plans corresponding to the plurality of types of predicted states, respectively. The protection and control planning device according to claim 1 .

9. a processing unit of a protection and control planning device that includes a processing unit that creates a protection and control plan for a power system, generating a future predicted state of the power system; the processing unit formulates a first protection and control plan for the power system that satisfies constraints on control of the power system based on the generated predicted state of the power system; the processing unit formulates a second protection and control plan for the power system in the event of a predicted accident occurring in the generated predicted state of the power system; and when the processing unit is unable to formulate the second protection and control plan that satisfies the constraint condition, creating predetermined information related to the constraint condition for changing plan content of at least one of the first protection and control plan and the second protection and control plan. Protection and control planning methods.

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