System switching candidate generating system and system switching candidate generating method

Abstract

To provide a system switching candidate generating system and method for a power system that are capable of making work with system switching such as work stop planning be efficient.SOLUTION: A system switching candidate generating system of a power system in which a plurality of facilities are interconnected via opening / closing devices comprises: a storage device for storing one or more work object facility data, system configuration data, and opening / closing state information on the opening / closing device; an opening / closing device search function for searching for a normally open opening / closing device in the vicinity of the work object facility data; a loop detection function for searching for a closed path including the normally open opening / closing device and a work object facility on the basis of the searched normally open opening / closing device and the work object facility data; and an opening / closing state combination generation function for generating a combination of the normally open opening / closing device and the opening / closing device included in the closed path, where the combination of the opening / closing devices is made to be a system switching candidate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a system for generating a power system switching candidate and a method for generating a power system switching candidate. [Background technology]

[0002] In recent years, the environment surrounding the power grid has been rapidly changing due to the expansion of renewable energy. Furthermore, the need for maintenance and inspection is increasing due to the aging of power grid equipment. When performing maintenance and inspection of power grid equipment, the equipment in question must be shut down. In this case, the shutdown of grid equipment reduces grid reliability, resulting in power outages and reduced power generation. In order to minimize the burden on grid users, grid operators change the transmission route to consumers and implement grid switching to ensure grid reliability.

[0003] In this regard, Patent Document 1 proposes that "an automatic equipment shutdown plan drafting device is disclosed that includes a work schedule generation mechanism that generates work schedules for work that involve the shutdown of power system equipment, and a reliability system planning mechanism that drafts a reliability system for each section of the work schedule generated by the work schedule generation mechanism. In this automatic equipment shutdown plan drafting device, the work schedule generation mechanism efficiently generates combinations of work that are expected to improve the evaluation function based on various conditions, and the reliability system planning mechanism repeatedly drafts a system configuration that ensures system reliability for each section of the generated work schedule." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-10501 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 describes a system that can develop an equipment shutdown plan after evaluating system reliability. It states that system switching can be considered in the process. Although there is no specific description of how system switching is considered, it is thought that the system is considered in advance by a human system or by a thorough search of switching candidates.

[0006] When considering a work outage plan, reliability and system switching are generally considered for a multi-faceted system, so there is an issue that devising system switching candidates manually one by one places a heavy burden on the work planner. On the other hand, generating system switching candidates through exhaustive search requires an enormous amount of calculation time as the range of systems considered in the work outage plan increases.

[0007] One approach to this problem is to store the system configuration after grid switching as data based on the planner's knowledge in advance and call it up as needed, but with the rapid advances in power operation technology and rapid changes in systems these days, the data itself is prone to becoming outdated, which remains an issue.In addition, there are problems with data maintenance and guaranteeing the validity of registered grid switching.

[0008] In view of the above, an object of the present invention is to provide a system and method for creating a system switching candidate for a power system that can improve the efficiency of tasks involving system switching, such as work suspension planning. [Means for solving the problem]

[0009] In view of the above, the present invention provides "a system for creating system switching candidates in an electric power system in which a plurality of facilities are interconnected via switchgear, the system comprising: a storage device for storing data on one or more facilities to be worked on, system configuration data, and switching state information on the switchgear; a switchgear search function for searching for a switchgear in a normally open state that is located near the facility data to be worked on; a loop detection function for searching for a closed circuit including a switchgear in a normally open state and the facility to be worked on based on the searched switchgear in the normally open state and the facility data to be worked on; and an opening and closing state combination generation function for generating a combination of a switchgear included in the closed circuit and a switchgear in a normally open state, the system being characterized in that the combination of switchgears is used as a system switching candidate."

[0010] Furthermore, the present invention provides a "system switching candidate creation method in an electric power system in which a plurality of facilities are interconnected via switchgear, the method comprising: a computer having a storage device, a calculation unit, and an output unit; the storage device storing data on one or more facilities to be worked on, system configuration data, and open / close state information of the switchgear; the calculation unit searching for a switchgear in a normally open state near the facility data to be worked on; searching for a closed circuit including the switchgear in the normally open state and the facility to be worked on based on the searched switchgear in the normally open state and the facility data to be worked on; generating a combination of the switchgear included in the closed circuit and the switchgear in the normally open state; and the output unit outputting the combination of the switchgear as a system switching candidate." [Effects of the Invention]

[0011] According to the present invention, it is possible to output system switching candidates in real time based on information on switches and system configuration, which are suited to specific purposes, thereby making it possible to improve the efficiency of tasks involving system switching, such as work stoppage planning. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing a hardware configuration and an auxiliary storage unit configuration of a system for creating a switching candidate for a power system according to a first embodiment of the present invention; [Figure 2] FIG. 2 is a diagram showing an example of system configuration data D1. [Figure 3] FIG. 10 is a diagram showing an example of opening and closing device information data D2. [Figure 4] 3 is a flowchart showing a procedure for generating a power system switching candidate according to the first embodiment of the present invention. [Figure 5] FIG. 10 is a diagram illustrating an image of a process for generating a system switching candidate. [Figure 6] FIG. 10 is a diagram showing an example of output from the system switching candidate generation system. [Figure 7] 10 is a flowchart showing a procedure for generating a power system switching candidate according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing original system power generation constraint data in the second embodiment. [Figure 9] 10 is a flowchart showing a procedure for generating a power system switching candidate according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] In Example 1, details of the operation mode when generating system switching candidates when a certain facility that is the target of work suspension is given will be described. In Example 2, details of the operation when satisfying system reliability and minimizing power generation constraints will be described as an example of the operation when narrowing down the obtained system switching candidates for some purpose. In Example 3, details of the operation when extracting facilities that can be worked on at a specified date and time taking system switching into consideration using the system configuration determination method described in Example 2 will be described. [Example]

[0015] 1 shows an example of the hardware configuration of a power system switching candidate creation system according to a first embodiment of the present invention. The power system switching candidate creation system 1 is generally configured with a computer device, and therefore includes a central processing unit 10 configured with a computer or computer server (CPU: Central Processing Unit), a main memory unit 11 configured with a storage device such as an HDD, an auxiliary memory unit 12 configured with an HDD, memory, etc., a communication unit 13, an input unit 14, and an output unit 15.

[0016] Of these, the central processing unit 10 may be configured as one or more semiconductor chips, or may be configured as a computer device such as a calculation server.

[0017] The communication unit 13 includes a circuit and a communication protocol for connecting to a communication network.

[0018] The input unit 14 can be configured to include at least one of a keyboard switch, a pointing device such as a mouse, a touch panel, a voice instruction device, and the like.

[0019] The output unit 15 is configured as, for example, a display device, but may be configured to use a printer device, audio output, etc. instead of or in addition to the display device. The output unit 15 outputs data processed by the central processing unit 10 or data recorded in the main memory unit 11 and auxiliary memory unit 12 in a form suitable for the device. Examples of output will be described later.

[0020] The external system 20 is a system that cooperates with the power system switching candidate creation system 1. There may be no or multiple systems that cooperate.

[0021] In FIG. 1, the auxiliary storage unit 12 stores system configuration data D1, switchgear information data D2, a switch search program Pr1, a loop detection program Pr2, and a switch state combination generation program Pr3.

[0022] An example of the configuration of the system configuration data D1 is shown in Figure 2. In the system configuration data D1, multiple sets of system configurations of the power system are prepared, and for each system configuration, the equipment belonging to the system configuration and its parameters are stored in each layer. For convenience, each of the multiple system configuration data in Figure 2 will be referred to as a sheet. Furthermore, each sheet is prepared for a different operating time and operating conditions of the power system.

[0023] 2, one of a plurality of different system configurations is shown at the front of the illustration. According to the configuration example of each sheet, system configuration data D1 includes system configuration definition information D11, upper layer information D12, and lower layer information D13. Note that the system configuration data D1 may be stored in any format, but here we will explain an example in which an upper-lower layer structure is adopted from the perspective of ease of handling.

[0024] Here we will explain the upper and lower layers of equipment included in a system configuration. Equipment that belongs to the upper layer includes large-scale facilities such as substations and power plants (sometimes collectively referred to as electric power stations). These large-scale facilities are made up of multiple smaller power facilities. Taking a substation as an example, it is generally made up of power facilities (multiple smaller power facilities) such as transformers, transmission lines, and buses. A lower layer represents a more detailed group of equipment that belongs to such upper layer facilities. In other words, upper layer equipment included in a certain system configuration has a system configuration inside it that is made up of equipment that belongs to the lower layer.

[0025] Returning to Figure 2, the system configuration definition information D11 includes a system configuration ID (A in the illustrated example) for identifying the system configuration, and a master ID indicating the main component equipment that makes up this power system (for example, power stations such as power plants and substations that belong to the upper layer).

[0026] The upper layer information D12 includes a space-time ID that defines the space-time, a space ID that defines the space, the name of the upper layer equipment (a substation in the above example), parameters, and lower-level equipment belonging to the substation (for example, power system components such as busbars, circuit breakers, switches, and transmission lines).

[0027] The lower layer information D13 includes a space-time ID that defines the space-time, a space ID that defines the space, the name of the lower layer equipment (in the above example, power system components such as busbars, circuit breakers, switches, and transmission lines that make up a substation), and parameters.

[0028] In Figure 2, the parameters of the upper layer are determined from the equipment group in the lower layer. As a relational database is assumed, the parameters required for the upper layer must be determined in advance and the database must be constructed. In this case, the parameters of the upper and lower layers do not need to match. Therefore, a flexible structure can be adopted, where geographical location information is input for facilities, but this information can be simplified as it is not important for equipment. For convenience, the terms upper and lower are used, but it is also possible to have a similar structure with three or more layers. Also, in this case, only information on the power transmission system is input, but the system configuration on the power distribution system side can also be included.

[0029] As described above, the system configuration definition information D11 stores the ID of each system configuration and the master ID of the equipment included in that configuration. The upper layer information D12 represents the equipment in the upper layer, and stores the master ID and equipment ID of that equipment, various specified parameters, and the master ID of the lower level equipment. The lower layer information D13 represents the equipment in the lower layer, and like the upper layer, stores the master ID, equipment ID, and specified parameters. Here, the master ID is an ID uniquely assigned to all time and equipment, and the equipment ID is an ID uniquely assigned to each piece of equipment within each system configuration.

[0030] Next, the switching gear information data D2 stored in the auxiliary storage unit 12 in FIG. 1 will be described. An example of the configuration of the switching gear information data D2 is shown in FIG. 3. The switching gear information data D2 records the normal open / close state of each switching gear. A switching gear is a device that can change the connection relationship of the power system, and is typified by a switchgear (LS) and a circuit breaker (CB). The normal open / close state here indicates whether each switching gear is in the open state or the closed state in a normal state when the power system is operating normally. Although the switching gear information data D2 in FIG. 2 shows the minimum amount of data, other data linked to the switching gear ID may also be included.

[0031] The above data D1 and D2 stored in the auxiliary storage unit 12 in Fig. 1 may be data created in another system, or the database itself may exist in another system. The switching device search program Pr1, the loop detection program Pr2, and the switching state combination generation program Pr3 will be described later.

[0032] Fig. 4 shows a flowchart illustrating the processing of the system switching candidate creation system according to the first embodiment of the present invention. In this processing, in addition to the system configuration data D1 and the switching device information data D2 shown in Fig. 1, work target facility data D3 (not shown in Fig. 1) is used.

[0033] In the first processing step S1 in Figure 4, processing corresponding to the switchgear search program Pr1 is executed. In processing step S1, system configuration data D1, switchgear information data D2, and work target equipment data D3 are read. The work target equipment data D3 is data for which a single equipment ID is specified and is set by another system or the user. In the following explanation, it is assumed that the user has specified substation SS1, among the substations positioned in the upper layer, as the work target equipment.

[0034] For example, Figure 5 is a diagram showing an example of a power system configuration that illustrates the process of creating a system switching candidate. The left side of Figure 5 shows an example of a configuration during normal operation in which power is supplied clockwise from the upstream substation SS1 to substations SS2-SS3 and counterclockwise to substations SS4-SS5-SS6. However, as shown in the example of switchgear information data D2 in Figure 3, substations SS3 and SS6 are not connected by a normally open switchgear CBB, and the power system does not form a closed loop. In processing step S1, it is assumed that upstream substation SS1 is specified as the facility to be worked on by the work target facility data D3.

[0035] Next, in processing step S1, the above data is used to search for switchgears whose normal switching state is open and located near the work target facility SS1. The nearby switchgears are determined by the number of pieces of equipment and the physical distance from the work target facility SS1 to the corresponding switchgear. Possible search methods include a breadth-first search method, which searches by tracing the corresponding facility and its node edge to the normally open switchgear. This process allows the search for the switchgear closest to the work target facility SS1 that can be used as the starting point for grid switching candidates. In the example of Figure 5, an open switchgear CBB between substations SS3 and SS6 is detected. The data for the discovered switchgear CBB is passed on to processing step S2.

[0036] In processing step S2, processing corresponding to loop detection program Pr2 is executed. In processing step S2, the normally open switchgear CBB, system configuration data D1, and work target equipment data D3 found in processing step S1 are read. In processing step S2, a search is made for the minimum loop that includes the normally open switchgear CBB found in processing step S1 and the equipment specified in the work target equipment data D3. Various methods can be considered for searching for loops, such as the breadth-first search used in processing step S1 or a method that applies depth-first search based on existing graph theory. If a loop cannot be detected, empty data is passed on to processing step S3. If a loop is detected, all switchgears belonging to that loop are passed on to processing step S3. This processing makes it possible to find the minimum closed circuit that includes the switchgear that is the starting point of system switching and the work target equipment. In the example of FIG. 5, it is assumed that it has been found that a minimum loop (SS1-SS2-SS3-SS6-SS5-SS4-SS1) can be formed by using the opening switchgear CBB between the substations SS3 and SS6.

[0037] In processing step S3, processing corresponding to the switching state combination generation program Pr3 is executed. In processing step S3, the switching device group searched for in processing step S2 and the normally open switching device data searched for in processing step S1 are read. In processing step S3, a combination is generated between a switching device in the normally open state and one or one section of the switching device group included in the searched loop. In this case, one section refers to a group of all switching devices when switching devices are connected to each other, such as switch-breaker-switch. This processing generates pairs of switching devices in the normally open state and individual switching devices present in other loops. System switching can be achieved by switching the switching state of the switching device pairs generated here.

[0038] In the example of Figure 5, system switching can be achieved by swapping the open / closed state of the switchgear pair consisting of the open switchgear CBA between substations SS1 and SS4 and the normally open switchgear CBB. The system configuration after system switching will be one that supplies power clockwise from the upstream substation SS1 to substations SS2-SS3-SS6-SS5-SS4, as shown on the right of Figure 5. The system configuration generated by this combination of open switches is handed over to processing step S4 as a system switching candidate.

[0039] Figure 5, which shows an overview of the process implemented by the above processing steps S1 to S3, explains the background to the above processing. In the system under normal operation shown on the left side of Figure 5, the normally open switchgear CBB is generally kept open to prevent any system reliability violations (such as short-circuit capacity constraints) that would occur if a loop were created in that area. However, in the event of a work stoppage at substation SS1, which could cause a deterioration in system reliability or a power outage, the normally open circuit breaker CBB may be closed as a detour and the other circuit breaker CBA may be opened to change the power transmission path and ensure system reliability. The above processing steps S1 to S3 are implemented. The right side of the figure shows an example of switching the open / close state of one of the combinations. A new power transmission path is constructed as shown in the figure, and the system is switched over. While the figure shows one combination, candidates for opening all transmission lines within the loop are generated.

[0040] In processing step S4, the data generated in processing step S3 is registered in a database or output. An example of the output is shown in Figure 6. In Figure 6, the normal system is drawn on the left side of the screen, and system switching candidates are drawn on the right side. In addition, by selecting a system switching ID, a system diagram of the selected system switching candidate can be drawn on the right side. The system configuration diagram can be drawn not only as a schematic configuration diagram as shown in the figure, but also as a single-line diagram or on a map linked to the physical reality.

[0041] The configuration of Example 1 is, in short, as follows: "A system switching candidate creation system 1 in an electric power system in which a plurality of facilities are interconnected via switchgears, comprising: a storage device 12 that stores one or more pieces of work target facility data D3, system configuration data D1, and switchgear open / close state data D2; a switchgear search function S1 that searches for a switchgear in a normally open state that is located near the work target facility data D3; a loop detection function S2 that searches for a closed circuit including a switchgear in a normally open state and the work target facility based on the searched switchgear in the normally open state and the work target facility data D3; and an open / close state combination creation function S3 that creates a combination of a switchgear included in the closed circuit and a switchgear in a normally open state, and the system switching candidate creation system is characterized in that the combination of switchgears is used as a system switching candidate."

[0042] According to the first embodiment, a candidate for system switching can be obtained as a system configuration created as a result of a combination of circuit breaker opening and closing. In addition, the candidate system configuration is guaranteed to have no nodes that will be disconnected due to the system switching, i.e., no substations or loads that will be affected by power outages. This function can be used to support the creation of plans that require system switching, such as work stoppage plans. [Example]

[0043] In the second embodiment, a case will be described in which the system switching candidate creation system shown in the first embodiment presents switching candidates that have high system reliability and can minimize a certain objective function. This time, the operation in the case of minimizing the power generation constraint amount will be described in detail as an example of the objective function. Note that the explanation will be omitted for the same configuration parts and the same operations as in the first embodiment.

[0044] A flowchart of the process in the second embodiment is shown in Fig. 7. In the figure, the process steps S1 to S4 and the data D1, D2, and D3 are the same as those in the first embodiment, so a description of these parts will be omitted.

[0045] In processing step S5, a predetermined system reliability analysis is performed as the next step for each of the system switching candidates generated by the switching state combinations obtained in processing step S3 in Figure 1. The system reliability analyzed here can be, for example, a transmission line overload determination using a general power flow calculation or an N-1 reliability determination, which determines whether a power outage will occur in the system in the event of a fault. The analysis results are passed on to processing step S6. This process makes it possible to quantitatively obtain the system reliability for each system configuration of the system switching candidate group.

[0046] In processing step S6, the analysis results obtained in processing step S5 are further judged for any violations. Taking the transmission line overload judgment and N-1 reliability judgment described in processing step S5 as an example, if an overload occurs on a transmission line, that is, if the ratio of the power flow to the operational capacity of the transmission line exceeds 100%, or if a power outage occurs in the N-1 system (the system during the fault), it is judged that a reliability violation has occurred, and processing proceeds to the right side of processing step S6 in Figure 7, where the corresponding system switching candidate is discarded, and the subsequent processing is terminated, or the system reliability violation judgment for the next system switching candidate is proceeded to. If no reliability violation has occurred, that system switching candidate is passed on to processing step S7.

[0047] In step S7, the amount of power generation constraint is calculated for each of the grid switching candidates that have not violated the reliability criteria and that were inherited from step S6. The power generation constraint here refers to requiring power producers to reduce the output of their generators when transmission line overload is expected.

[0048] There is some debate about how to calculate the power generation constraint amount, but one possible method is to follow the calculation method described in the Outage Planning Manual of the Organization for Cross-regional Coordination of Transmission Operators, Japan. This makes it possible to obtain the power generation constraint amount for the entire system configuration and the power generation constraint amount for each generator, which are then passed on to processing step S8. This process makes it possible to calculate the power generation constraint amount for each system configuration in the system switching candidate group.

[0049] In processing step S8, the power generation constraint amount for each system configuration of the system switching candidate group inherited from processing step S7 is compared with the power generation constraint amount for the original system configuration stored in the original system power generation constraint amount data D4. If the comparison shows that the power generation constraint amount is complied with, the process proceeds to processing step S4, where data registration and output processing are performed, and if the power generation constraint is violated, the process proceeds to the right side of processing step S8 in Fig. 7, where the corresponding system switching candidate is discarded, and the subsequent processing is terminated, or the process proceeds to determining whether the next system switching candidate violates the power generation constraint.

[0050] An example of the configuration of the original system power generation constraint data D4 is shown in Fig. 8. The original system power generation constraint data D4 records power generation constraint data for each generator in the system state before system switching. In the example of Fig. 8, in addition to the power generation constraint data for each generator A, B, and C, the total value (SUM) of the power generation constraint data for the entire system is stored. This data may be provided externally or may be generated within the system using the power generation constraint calculation function in processing step S7.

[0051] The power generation constraint amounts to be compared may be those of the entire system configuration, or those of the generators involved in the work stoppage specified in the work target equipment data D4. In either case, if the power generation constraint amount has been reduced by the system switching, it is determined that the power generation constraint amount has been improved by the system switching, and the system switching candidate is passed on to processing step S4. If the constraint amount has not been improved, the system switching candidate is discarded.

[0052] The configuration of the second embodiment is the same as that of the first embodiment, but further comprises "a system switching candidate generation system characterized by including a system reliability analysis function S5 that performs a system reliability analysis on a system configuration created from the generated combination of switching devices, and a system reliability violation determination function S6 that determines a violation of the system reliability by comparing the obtained system reliability analysis result with a predetermined threshold value."

[0053] According to the second embodiment, it is possible to extract, from among the grid switching candidates, a switching candidate that can improve the power generation constraint amount while satisfying grid reliability. Although the second embodiment gives an example of the objective of improving the power generation constraint amount, it is also possible to extract a grid switching candidate that minimizes / maximizes the objective function calculated by the same flow for other objectives. [Example]

[0054] In the third embodiment, a case will be shown in which whether a group of work applications input in a system cross section at a certain date and time can be stopped or not is presented using the system switching candidate creation system shown in the first and second embodiments, and if so, which system configuration can most fully achieve the power generation constraint amount. Note that explanations will be omitted for the same configuration parts and operations as those in the first and second embodiments.

[0055] A flowchart of the process in the third embodiment is shown in Fig. 9. In the figure, the process steps S1 to S7 and the data D1 and D2 are the same as those in the first and second embodiments, so a description of these parts will be omitted.

[0056] In the case of Example 3, the work application data D3 is a data set in which multiple pieces of work target equipment data D3 are registered, and multiple equipment IDs that may be stopped at a single cross section on the relevant date and time are specified, and is data set by another system or a user.

[0057] In processing step S9, all combinations are generated from the multiple equipment IDs registered in the work application data D3. That is, if the IDs of equipment A, equipment B, and equipment C are registered, the generated combinations will be seven: (equipment A) (equipment B) (equipment C) (equipment A, equipment B) (equipment B, equipment C) (equipment A, equipment C) (equipment A, equipment B, equipment C). The obtained combinations are handed over to processing step S10. This processing makes it possible to generate equipment combinations that will ultimately determine which combination of shutdown requests is possible for shutdown at the relevant date and time.

[0058] In processing step S10, for each of the equipment combinations for which shutdown requests were obtained in processing step S9, a system cross section is created in which the specified set of equipment is stopped. One possible method for creating this is to open the circuit breakers on both ends of the equipment specified in the equipment combination for which shutdown requests were made. This process creates a system cross section that reflects the equipment shutdowns, and prepares for subsequent analysis processing.

[0059] In process step S11, a determination is made based on the system reliability analysis result and the power generation constraint calculation result obtained in process steps S5 and S7. Specifically, the same determination as in process steps S6 and S8 in Fig. 7 is used, and if there is a reliability violation in the system reliability analysis result or the power generation constraint amount is not 0, the process is passed on to process step S1. If there is no reliability violation in the system reliability analysis result and the power generation constraint amount is 0, the data is passed on to process step S12.

[0060] In process step S12, it is determined whether all of the combinations of stopped equipment generated in process step S9 have been analyzed. If there are combinations that have not yet been analyzed, the process returns to process step S10, where a new combination of stopped equipment is analyzed. If all of the combinations of stopped equipment have been analyzed, the process returns to process step S4.

[0061] In processing step S13, the system configuration with the most improved power generation constraint amount is extracted from the system switching candidates analyzed in processing step S7, and processing is handed over to processing step S12. If the power generation constraint amount of the system configuration before the system switching is the smallest, the configuration before the switching is selected. If all system configurations have been discarded in the previous processing step S6, empty data is handed over to processing step S12.

[0062] The configuration of the third embodiment is the same as that of the first embodiment, but further includes "an objective function calculation function S7 that calculates a predetermined objective function for a system configuration created from the generated combination of switching devices, and system configuration determination functions S11, S12, and S13 that determine the system configuration with the most improved objective function from the calculation results of the obtained objective function."

[0063] According to the third embodiment, it is possible to make a decision on whether each task can be performed while taking into consideration grid switching, and if so, which grid configuration is optimal. In this embodiment, a single date and time has been described, but by performing the process shown in the third embodiment for multiple time periods, it is possible to extract candidate work suspension dates and create a schedule for a work suspension plan that takes grid switching into consideration. In this example, improvement of power generation constraints has been given as an example of an objective, but for other objectives as well, it is possible to extract grid switching candidates that minimize / maximize the objective function found using the same flow. [Explanation of symbols]

[0064] 10: Central processing unit 11: Main memory 12: Auxiliary storage 13: Communications Department 14: Input section 15: Output section

Claims

1. A system switching candidate generation system in an electric power system in which a plurality of facilities are interconnected via switchgears, a storage device that stores one or more pieces of work target facility data, system configuration data, and switching state information of switching devices; a loop detection function that searches for a closed circuit including a switchgear in a normally open state and the work target equipment data based on the searched switchgear in a normally open state and the work target equipment data; and a switch state combination generation function that generates a combination of a switchgear included in the closed circuit and the switchgear in the normally open state, and the system switching candidate creation system is characterized in that the system switching candidate creation system is characterized by comprising: a switchgear search function that searches for a switchgear in a normally open state that is located near the work target equipment data; a loop detection function that searches for a closed circuit including a switchgear in a normally open state and the work target equipment data based on the searched switchgear in a normally open state and the work target equipment data; and a switch state combination generation function that generates a combination of a switchgear included in the closed circuit and the switchgear in the normally open state, and the system switching candidate creation system is characterized in that the combination of switchgears is set as a system switching candidate.

2. The system switching candidate generation system according to claim 1, A system switching candidate creation system characterized by comprising: a system reliability analysis function that performs system reliability analysis on a system configuration created from the generated combination of switching devices; and a system reliability violation determination function that determines whether or not there is a system reliability violation by comparing the obtained system reliability analysis result with a predetermined threshold value.

3. 3. The system for generating a power system switching candidate according to claim 1, A system switching candidate creation system characterized by comprising a function for calculating a predetermined objective function for a system configuration created from the generated combination of switching devices, and a function for determining the system configuration with the most improved objective function from the calculation results of the obtained objective function.

4. The system switching candidate generation system according to claim 1, A system switching candidate creation system characterized by comprising: a combination generation function that generates combinations of equipment to be shut down at a specified date and time based on work application data; a system cross section creation function that shuts down equipment in the system configuration according to the generated combination of shut down equipment and creates an analyzable system cross section; a system switching candidate extraction function that extracts, from the system switching candidates generated in the system cross section, a system switching candidate that satisfies system reliability and has the most improved objective function; and a shutdown feasibility determination function that determines whether each combination of shut down equipment at the specified date and time can be shut down.

5. The system switching candidate generation system according to claim 4, A system switching candidate creation system characterized by having a function to determine a system switching candidate that most improves a specified objective function among equipment that can be stopped for a specified period and system configurations that can be stopped.

6. The system switching candidate generation system according to claim 1, The system configuration data is stored in the storage device as a multi-layer structure having an upper layer including large-scale facilities of the power system and their parameters, and a lower layer including facilities within the large-scale facilities and their parameters.

7. A method for creating a system switching candidate in a power system in which a plurality of facilities are interconnected via switchgears, comprising: The computer has a storage device, a calculation unit, and an output unit, the storage device stores one or more pieces of work target facility data, system configuration data, and switching state information of switching devices; the calculation unit searches for a switchgear in a normally open state near the work target equipment data, searches for a closed circuit including the switchgear in a normally open state and the work target equipment based on the searched switchgear in a normally open state and the work target equipment data, and generates a combination of the switchgear included in the closed circuit and the switchgear in the normally open state; The system switching candidate generation method, wherein the output unit outputs a combination of switching devices as a system switching candidate.

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