Power system stop plan creation support device, computer program for power system stop plan creation support device, and power system stop plan creation support method

Abstract

To provide a power system stop plan creation support device that more quickly supports power generation output by which appropriate power is supplied to a load and selection of a section in which power supply is stopped.SOLUTION: A power system stop plan creation support device 1 includes: a power flow calculation execution part 102 that executes power flow calculation by applying first power generation output data D1, which is data related to an output of a power generator that supplies power to a power system, to system configuration data G2 indicating a configuration of a stopped power system, which is created by removing a power transmission and distribution facility relating to study facility data G3 to be stopped from the power system relating to the system configuration data G1 indicating the configuration of the power system that is the target of a stop plan; a current distribution determination part 105 that determines whether or not there is a portion at which a power flow deviates in the power flow calculation; and a power generator control part 104 that adjusts the output of the power generator disposed in the stop power system and creates second power generation output data D2 when the current distribution determination part 105 determines that there is a portion where the power flow deviates from the stop power system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present embodiment relates to a power system shutdown plan creation support device, a computer program for the power system shutdown plan creation support device, and a power system shutdown plan creation support method that support selecting a section of a power system to which power supply is to be stopped when creating a plan to stop the supply of power. [Background technology]

[0002] In order to maintain a stable supply of power, maintenance work is performed on power systems. In some cases, the power supply to a section of the power system must be stopped during the maintenance work. A power system shutdown plan creation support device that supports the creation of a plan to stop the power supply is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-080471 [Patent Document 2] Japanese Patent Application Laid-Open No. 2024-006560 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, in maintenance work to maintain a stable supply of power, the supply of power to a portion of a power system may be stopped. Even when the supply of power to a portion of a power system is stopped, it is preferable to maintain a predetermined supply of power to loads throughout the entire power system.

[0005] Even when the power supply to some sections is stopped, the loads in the power grid must be electrically connected to one of the generators and be supplied with power. The power output from the generator is supplied to the loads via transmission lines, transformers, busbars, etc. In order to ensure a stable supply of power to the loads, the current flowing through the transmission lines, transformers, and busbars must be below a predetermined upper limit. Furthermore, the voltage appearing on the transmission lines, transformers, and busbars must be below a predetermined upper limit and above a predetermined lower limit.

[0006] When cutting off the power supply in a certain section, there was a problem in that it was complicated to select the section for which the power supply was to be cut off, where the load of the power system was electrically connected to one of the generators and the current and voltage supplied to the transmission line, transformer, and busbar were within a predetermined range.

[0007] In view of the above-mentioned problems, the present embodiment aims to provide a power system shutdown plan creation support device, a computer program for the power system shutdown plan creation support device, and a power system shutdown plan creation support method that support faster selection of a power generation output that supplies appropriate power to a load and a section to which power supply is to be stopped when power supply to a section in a power system is to be stopped. [Means for solving the problem]

[0008] The power system shutdown plan creation support device of this embodiment has the following features. (1) A power flow calculation execution unit is provided that performs a power flow calculation by applying first power generation output data, which is data regarding the output of a generator that supplies power to the power system, to data indicating the configuration of the power system that is to be stopped, which data is created by removing the power transmission and distribution equipment in the data indicating the power transmission and distribution equipment to be stopped from the power system in the data indicating the configuration of the power system that is the subject of the shutdown plan. (2) A current distribution determination unit is provided that determines whether there is a point of power flow deviation in the power flow calculation relating to the configuration of the stopped power system executed by the power flow calculation execution unit. (3) A generator control unit is provided that, when the current distribution determination unit determines that there is a point in the suspended power system where there is a deviation in the power flow, adjusts the output of a generator arranged in the suspended power system and creates second power generation output data. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a configuration of a power system shutdown plan creation support device 1 according to a first embodiment. [Figure 2] FIG. 1 is a diagram showing a program flow of a power system shutdown plan creation support device 1 according to a first embodiment. [Figure 3] FIG. 1 is a diagram showing an example of system configuration data G1 of a power system shutdown plan creation support device 1 according to a first embodiment. [Figure 4] FIG. 1 is a diagram showing an example of system configuration data G2 of the power system shutdown plan creation support device 1 according to the first embodiment. [Figure 5] FIG. 1 is a diagram showing an example of decision path record data RE of the power system shutdown plan creation support device 1 according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [First embodiment] [1-1.Configuration] As an example of this embodiment, the configuration of a power system shutdown plan creation support device 1 will be described with reference to Fig. 1. The power system shutdown plan creation support device 1 is configured by a computer. When power supply to a part of a section is to be stopped, the power system shutdown plan creation support device 1 supports more quickly selecting a section to be power stopped where the load of the power system is electrically connected to one of the generators and the current and voltage supplied to the transmission line, transformer, and busbar are within a predetermined range.

[0011] The power system shutdown plan creation support device 1 includes a processing unit 10, a storage unit 20, an input unit 40, and an output unit 50.

[0012] The input unit 40 is configured by an operating device such as a keyboard, a mouse, or a touch panel, or a receiving circuit and an external memory connection circuit. The input unit 40 is connected to the processing unit 10 and the storage unit 20. An operator operates the input unit 40 to input data from the input unit 40 to the processing unit 10 and the storage unit 20. Data may also be input to the processing unit 10 and the storage unit 20 via the input unit 40 from a communication or external storage device.

[0013] The input unit 40 includes a system configuration input unit 401 , a facility under consideration input unit 402 , and a power generation output input unit 403 .

[0014] System configuration data G1 is input to the system configuration input unit 401. The system configuration data G1 is data indicating the configuration of the power system that is the target of the shutdown plan. The system configuration input unit 401 stores the system configuration data G1 in a system configuration DB 201 of the storage unit 20, which will be described later.

[0015] The equipment under consideration input unit 402 receives input of equipment under consideration data G3. The equipment under consideration data G3 is information relating to transmission lines, transformers, and busbars in the power system that are to be shut down. The equipment under consideration data G3 includes information relating to one or more of the transmission lines, transformers, and busbars that are to be shut down. The equipment under consideration input unit 402 transmits the equipment under consideration data G3 to the system configuration update unit 101 of the processing unit 10, which will be described later.

[0016] The power generation output data D1 is input to the power generation output input unit 403. The power generation output data D1 is data related to the generator output of the power system that is the target of the shutdown plan. The power generation output input unit 403 stores the power generation output data D1 in the power generation output DB 203 of the storage unit 20, which will be described later.

[0017] The processing unit 10 is configured by a CPU (Central Processing Unit) of a computer, etc. The processing unit 10 is connected to a storage unit 20, an input unit 40, and an output unit 50. The processing unit 10 controls the storage unit 20, the input unit 40, and the output unit 50.

[0018] The processing unit 10 has a system configuration update unit 101, a power flow calculation execution unit 102, a formulation generation unit 103, a generator control unit 104, a current distribution determination unit 105, a voltage distribution determination unit 106, and an operation system determination unit 107. Each of the above units of the processing unit 10 is configured by a software module or hardware. The processing unit 10 performs calculation processing using each of the above units.

[0019] The system configuration update unit 101 creates system configuration data G2. The system configuration data G2 is created based on the system configuration data G1 stored in the system configuration DB 201 and the considered facility data G3 input from the considered facility input unit 402. The system configuration update unit 101 removes the facilities under consideration related to the considered facility data G3 from the power system from the system configuration data G1, and generates a new power system as system configuration data G2. The system configuration update unit 101 stores the system configuration data G2 in the system configuration DB 202 of the storage unit 20, which will be described later.

[0020] The power flow calculation executing unit 102 generates power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3. The power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 is generated based on the system configuration data G2 stored in the system configuration DB 202, the power generation output data D1 stored in the power generation output DB 203, the power generation output data D2 stored in the power generation output DB 204, or the power generation output data D3 stored in the power generation output DB 205.

[0021] The power flow calculation executing unit 102 executes a power flow calculation using the system configuration according to the system configuration data G2 and the generator output according to the power generation output data D1, the power generation output data D2, or the power generation output data D3, and sets the calculation result as power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3. The power flow calculation executing unit 102 stores the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 in the power flow calculation result DB 206 of the storage unit 20.

[0022] The formulation generation unit 103 generates an objective function and constraint equations for mathematical optimization of the target power system. The objective function and constraint equations for mathematical optimization are created based on system configuration data G2 stored in the system configuration DB 202 and power generation output data D1 stored in the power generation output DB 203. The formulation generation unit 103 transmits the objective function and constraint equations for mathematical optimization to the generator control unit 104.

[0023] The generator control unit 104 creates power generation output data D2 and power generation output data D3. The power generation output data D2 and power generation output data D3 are created based on the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103. The generator control unit 104 performs economic dispatch optimization with grid constraints based on the formulated objective function and constraint equations to create power generation output data D2 and power generation output data D3.

[0024] The power generation output data D2 and D3 are data in which the power generation output has been updated and recorded. The generator control unit 104 stores the power generation output data D2 in the power generation output DB 204 of the storage unit 20, and stores the power generation output data D3 in the power generation output DB 205.

[0025] The current distribution determination unit 105 determines whether there is a point of power flow deviation in the power flow calculation result data P1 created by the power flow calculation execution unit 102. If the current distribution determination unit 105 determines that there is a point of power flow deviation in the power flow calculation result data P1, processing by the formulation generation unit 103 and processing by the generator control unit 104 are executed.

[0026] The voltage distribution determining unit 106 determines whether there are any points of voltage deviation in the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 created by the power flow calculation executing unit 102. For which the voltage distribution determining unit 106 has determined that there are no points of voltage deviation, the system configuration data G2 and power generation output data D1, power generation output data D2, or power generation output data D3 corresponding to the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 are determined to be appropriate as the configuration and power generation output of the power system to be worked on.

[0027] The work system determination unit 107 determines the power system to be the target of shutdown work. The determination of the power system to be the target of work is made based on the determined path record data RE stored in the determined path record DB 210. The determined path record data RE is data in which the path of processing executed in a program described below is recorded. The processing unit 10 sequentially stores the processing steps of the program in the determined path record DB 210.

[0028] The operation system determination unit 107 transmits the determined path record data RE to the output unit 50.

[0029] The work system determination unit 107 determines whether the work related to the system configuration data G2 and the power generation output data D1, D2, or D3 can be carried out based on the determined path record data RE stored in the determined path record DB 210. The work system determination unit 107 transmits the system configuration data G2 and the power generation output data D1, D2, or D3, for which it has been determined that the work can be carried out, to the output unit 50.

[0030] If the work system determination unit 107 determines that work related to the system configuration data G2 and the power generation output data D1, the power generation output data D2, or the power generation output data D3 cannot be performed, it transmits to the output unit 50 a message indicating that the system configuration data G2 is not a work target.

[0031] The storage unit 20 is configured with a storage medium such as a hard disk or semiconductor memory. The storage unit 20 is connected to the processing unit 10 and the input unit 40. The processing unit 10 or the input unit 40 controls the writing and reading of data into and from the storage unit 20.

[0032] The storage unit 20 has a system configuration database 201 (hereinafter referred to as "system configuration DB201"), a system configuration database 202 (hereinafter referred to as "system configuration DB202"), a power generation output database 203 (hereinafter referred to as "power generation output DB203"), a power generation output database 204 (hereinafter referred to as "power generation output DB204"), a power generation output database 205 (hereinafter referred to as "power generation output DB205"), a power flow calculation result database 206 (hereinafter referred to as "power flow calculation result DB206"), a power flow calculation result database 207 (hereinafter referred to as "power flow calculation result DB207"), a system configuration database 208 (hereinafter referred to as "system configuration DB208"), a power generation output database 209 (hereinafter referred to as "power generation output DB209"), and a determined path record database 210 (hereinafter referred to as "determined path record DB210").

[0033] The system configuration DB 201 stores system configuration data G1, which is transmitted from the system configuration input unit 401 of the input unit 40.

[0034] The system configuration DB 202 stores system configuration data G2, which is transmitted from the system configuration update unit 101.

[0035] The power generation output DB 203 stores power generation output data D1. The power generation output data D1 is transmitted from the power generation output input unit 403 of the input unit 40.

[0036] The power generation output DB 204 stores power generation output data D2, which is transmitted from the power generator control unit 104.

[0037] The power generation output DB 205 stores the power generation output data D3. The power generation output data D3 is transmitted from the power generator control unit 104.

[0038] The power flow calculation result DB 206 stores power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3. The power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 is transmitted from the power flow calculation executing unit 102.

[0039] Power flow calculation result data PE is stored in power flow calculation result DB 207. Of power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 stored in power flow calculation result DB 206, data related to the power system that is the target of the work is extracted by processing unit 10 and used as power flow calculation result data PE.

[0040] The system configuration DB 208 stores system configuration data GE. Based on the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 stored in the power flow calculation result DB 206, the processing unit 10 extracts system configuration data of the power system to be worked on, and sets the extracted data as system configuration data GE.

[0041] The power generation output DB 209 stores power generation output data DE. Based on the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 stored in the power flow calculation result DB 206, the processing unit 10 selects power generation output data D1, D2, or D3 of the power system that is the target of the work, and sets this as power generation output data DE.

[0042] The determination path record DB 210 stores determination path record data RE. The determination path record data RE is data that records the path of processing executed in a program described below. The processing steps of the program are sequentially stored in the determination path record DB 210 by the processing unit 10.

[0043] The output unit 50 is composed of a display device such as a liquid crystal display, a printing device such as a printer, a transmission circuit, an external memory connection circuit, etc. The output unit 50 is connected to the processing unit 10. The output unit 50 outputs data created by the processing unit 10. The output unit 50 outputs the data created by the processing unit 10 as a display, printout, or electronic data.

[0044] The output unit 50 transmits the data created by the processing unit 10 to an external device. The external device connected to the output unit 50 may be an I / O device such as a printer or a monitor, an external storage device, or an external control device or computer device.

[0045] The output unit 50 outputs the judgment path record data RE transmitted from the work system determination unit 107 of the processing unit 10, the system configuration data G2 for which it has been determined that the work can be carried out, and the power generation output data D1, power generation output data D2, power generation output data D3, or a message indicating that the system configuration data G2 is not a work target.

[0046] The above is the configuration of the power system shutdown plan creation support device 1 according to this embodiment.

[0047] [1-2. Effect]

[0048] Next, the operation of the power system shutdown plan creation support device 1 of this embodiment will be described with reference to FIGS.

[0049] The power system shutdown plan creation support device 1 adjusts the output of generators that supply power to the power system that is the target of the shutdown plan, thereby supporting the quicker selection of sections in the power system where power supply is to be stopped.

[0050] In the input unit 40 of the power system shutdown plan creation support device 1, system configuration data G1 is input to the system configuration input unit 401, consideration facility data G3 is input to the consideration facility input unit 402, and power generation output data D1 is input to the power generation output input unit 403. The system configuration data G1 indicates the configuration of the power system that is the subject of the shutdown plan. The consideration facility data G3 indicates the transmission and distribution facility that is the subject of shutdown. The power generation output data D1 indicates the output of the generator that supplies power to the power system.

[0051] An example of the system configuration data G1 is shown in Fig. 3. As shown in the system configuration data G1, the power system that is the subject of the shutdown plan has generators M and N and branches A, B, C, D, and E, as an example.

[0052] The system configuration update unit 101 removes the power transmission and distribution equipment to be suspended, which is included in the equipment under consideration data G3, from the power system according to the system configuration data G1 input to the input unit 40, and creates new system configuration data G2 that indicates the configuration of the suspended power system. The suspended power system is a power system in which power transmission and distribution of some of the power transmission and distribution equipment has been suspended.

[0053] An example of the system configuration data G2 is shown in Figure 4. As an example, if the considered equipment data G3 indicates that branch E is to be shut down, the system configuration data G2 has a configuration of the shut down power system with branch E removed. The system configuration data G2 may be expressed as a circuit diagram as shown in Figure 4(a) or as a system model as shown in Figure 4(b).

[0054] The power flow calculation executing unit 102 applies the first power generation output data D1 to the system configuration data G2) created by the system configuration updating unit 101 to execute a power flow calculation.

[0055] The current distribution determination unit 105 determines whether there is a point where the power flow deviates in the power flow calculation performed by the power flow calculation execution unit 102 and related to the configuration of the power system that has been stopped.

[0056] When the current distribution determination unit 105 determines that there is a point of power flow deviation in the suspended power system, the generator control unit 104 adjusts the output of the generator arranged in the suspended power system and creates power generation output data D2. The power generation output data D2 is second power generation output data.

[0057] The generator control unit 104 adjusts the output of a generator that has been selected in advance as an initial adjustment generator in the stopped power system, and creates power generation output data D2.

[0058] The formulation generating unit 103 applies the power generation output data D2 to the system configuration data G2 indicating the configuration of the power system to be stopped to generate an objective function.

[0059] When the generator control unit 104 determines that there is no solution to the objective function created by applying the second power generation output data D2, created by adjusting the output of the generator selected in advance as the generator for initial adjustment, to the system configuration data G2 indicating the configuration of the suspended power system, the generator control unit 104 adjusts the output of another generator in the suspended power system other than the generator selected in advance as the generator for initial adjustment to create the power generation output data D3. The power generation output data D3 is the third power generation output data.

[0060] The work system determination unit 107 outputs, via the output unit 50, the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3 that has been determined to be appropriate as a target for shutdown work, and system configuration data G2 that indicates the configuration of the shutdown power system, based on the determination path recording data RE that indicates the program processing steps related to the processing of performing power flow calculations by applying the first power generation output data D1, the processing of performing power flow calculations by applying the second power generation output data D2, or the processing of performing power flow calculations by applying the third power generation output data D3.

[0061] The work system determination unit 107 outputs the decision path record data RE via the output unit 50.

[0062] The voltage distribution determination unit 106 determines whether there are any points where voltage deviations that are not within a predetermined voltage range when the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3 are applied to the configuration of a suspended power system. The work system determination unit 107 determines that the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3, which are determined by the voltage distribution determination unit 106 to have no points where voltage deviations, and the suspended power system are appropriate targets for shutdown work.

[0063] The output unit 50 outputs the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3 that has been selected as the work target by the work system determination unit 107, the system configuration data G2 relating to the stopped power system, and the judgment path record data RE that indicates the processing process of the program.

[0064] The details of the operation of the power system shutdown plan creation support device 1 are as follows.

[0065] The system configuration data G1 is input to the system configuration input unit 401 of the input unit 40. The system configuration data G1 is data indicating the configuration of the power system for which an outage plan is to be created. The system configuration input unit 401 stores the system configuration data G1 in the system configuration DB 201 of the storage unit 20.

[0066] The equipment under consideration input unit 402 of the input unit 40 receives input of equipment under consideration data G3. The equipment under consideration data G3 is information relating to the transmission lines, transformers, and busbars to be shut down in the target power system. The equipment under consideration data G3 includes information relating to one or more of the transmission lines, transformers, and busbars to be shut down. The equipment under consideration input unit 402 transmits the equipment under consideration data G3 to the system configuration update unit 101 of the processing unit 10.

[0067] The power generation output data D1 is input to the power generation output input unit 403 of the input unit 40. The power generation output data D1 is data related to the generator output of the power system for which an outage plan is to be created. The power generation output input unit 403 stores the power generation output data D1 in the power generation output DB 203 of the storage unit 20.

[0068] The system configuration update unit 101 creates system configuration data G2 based on the system configuration data G1 stored in the system configuration DB 201 and the facility under consideration data G3 input from the facility under consideration input unit 402.

[0069] The system configuration update unit 101 removes the equipment to be stopped, which is indicated in the considered equipment data G3, from the system configuration data G1, and creates system configuration data G2 that indicates the configuration of a stopped power system. A stopped power system is a power system in which the power transmission and distribution of some of the power transmission and distribution equipment has been stopped. The system configuration data G2 may be represented by a power system model. The system configuration update unit 101 updates the system configuration data G1 to create system configuration data G2. The system configuration update unit 101 stores the created system configuration data G2 in the system configuration DB 202.

[0070] The power flow calculation execution unit 102 generates power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3. The power flow calculation execution unit 102 applies a load prediction and a power generation prediction, which is the generator output, related to the power generation output data D1, power generation output data D2, or power generation output data D3 to the system configuration data G2, and executes a power flow calculation.

[0071] The power flow calculation result data P1 is created based on the system configuration data G2 stored in the system configuration DB 202 and the power generation output data D1 stored in the power generation output DB 203. The power flow calculation executing unit 102 executes a power flow calculation using the system configuration according to the system configuration data G2 and the generator output according to the power generation output data D1, and sets the calculation result as power flow calculation result data P1. The power flow calculation executing unit 102 stores the power flow calculation result data P1 in the power flow calculation result DB 206 of the storage unit 20.

[0072] The power flow calculation result data P2 is created based on the system configuration data G2 stored in the system configuration DB 202 and the power generation output data D2 stored in the power generation output DB 204. The power flow calculation executing unit 102 executes a power flow calculation using the system configuration according to the system configuration data G2 and the generator output according to the power generation output data D2, and sets the calculation result as power flow calculation result data P2. The power flow calculation executing unit 102 stores the power flow calculation result data P2 in the power flow calculation result DB 206 of the storage unit 20.

[0073] The power flow calculation result data P3 is created based on the system configuration data G2 stored in the system configuration DB 202 and the power generation output data D3 stored in the power generation output DB 205. The power flow calculation executing unit 102 executes a power flow calculation using the system configuration related to the system configuration data G2 and the generator output related to the power generation output data D3, and sets the calculation result as power flow calculation result data P3. The power flow calculation executing unit 102 stores the power flow calculation result data P3 in the power flow calculation result DB 206 of the storage unit 20.

[0074] The formulation generation unit 103 generates an objective function and constraint equations for mathematical optimization of the target power system. The objective function and constraint equations for mathematical optimization are created based on system configuration data G2 stored in the system configuration DB 202 and power generation output data D1 stored in the power generation output DB 203. The formulation generation unit 103 transmits the objective function and constraint equations for mathematical optimization to the generator control unit 104.

[0075] As an example, the formulation generator 103 creates the following objective function and constraint equations:

[0076] (Creating a piecewise linear approximation function for fuel cost characteristics) The formulation generation unit 103 creates an approximation function by piecewise linear approximation of the fuel cost characteristics based on the power plant-related data received from an external power plant-related database. The formulation generation unit 103 converts the fuel cost characteristics that indicate the relationship between the power plant output P and the fuel cost Q into an approximation function by piecewise linear approximation by dividing the possible ranges of the power plant output P and the fuel cost Q at the power plant into a predetermined number of divisions.

[0077] (Creating a piecewise linear approximation function for transmission loss characteristics) The formulation generation unit 103 creates an approximation function by piecewise linear approximation of the transmission loss characteristics based on the power system-related data received from an external power system-related database. The formulation generation unit 103 converts the transmission loss characteristics, which indicate the relationship between the phase difference angle δ and the transmission loss L, into an approximation function by piecewise linear approximation by dividing the possible ranges of the transmission line phase difference angle δ and the transmission loss L into a predetermined number of divisions.

[0078] The transmission loss characteristics, which show the relationship between the phase difference angle δ and the transmission loss L, are expressed by an approximation function using the phase difference angles δi and δj and the conductance Gij in the branch between nodes i and j, as shown in (Equation 1).

number

[0079] (Creating constraints for the power equation) The formulation generation unit 103 creates constraint equations according to the following (Equation 2) to (Equation 9) based on various data such as the fuel cost characteristics converted into approximate functions, the transmission loss characteristics converted into approximate functions, the power system related data stored in the power system related database, the load demand related data stored in the load demand related database, and the power plant related data stored in the power plant related database.

number

number

[0080] The formulation generation unit 103 creates constraints on DC method-based power equations, constraints on upper and lower limits of power flow in transmission lines, constraints on transmission losses in transmission lines, etc., based on various data such as the fuel cost characteristics converted into approximate functions using piecewise linear approximation, the transmission loss characteristics converted into approximate functions using piecewise linear approximation, the power system-related data stored in the power system-related database, the load demand of the power system related to the load demand-related data stored in the load demand-related database, and the power plant output related to the power plant-related data stored in the power plant-related database.

[0081] The formulation generation unit 103 assigns simulated loads equivalent to the transmission loss plossij to nodes i and j at both ends of the branch for which the transmission loss is to be calculated, and generates constraint equations (Equation 2a) and (Equation 2b) for the DC method-based power equations by power flow calculation. This reduces the power flow error due to the transmission loss at each node.

[0082] The formulation generating unit 103 creates constraint equations (Equation 2a) and (Equation 2b) of the power equation that indicate the relationship between the phase difference angle of each node and the amount of power injection including the simulated load.

[0083] (Creating a constraint equation for supply and demand balance) The formulation generation unit 103 creates a constraint equation (Equation 3) for the supply and demand balance by subtracting the sum of the transmission losses from the sum of the power generation outputs of the generators currently in operation in the power system, based on various data such as the fuel cost characteristics converted into an approximate function using piecewise linear approximation, the transmission loss characteristics converted into an approximate function using piecewise linear approximation, the power plant output according to the power plant-related data stored in the power plant-related database, and the load demand of the power system according to the load demand-related data stored in the load demand-related database.

[0084] The supply and demand balance constraint equation (Equation 3) reflects the power flow related to the transmission loss of the transmission line in the constraint equation.

[0085] (Creating constraints for upper and lower branch flow limits) The formulation generation unit 103 creates constraint equations (Equation 4) for the upper and lower limits of the power flow of the branch based on various data such as the transmission loss characteristics converted into an approximate function by piecewise linear approximation and the reactance X of the transmission line related to the power system-related data stored in the power system-related database.

[0086] The power flow in a transmission line is calculated using the phase difference angle δ and reactance X of the branch. The formulation generation unit 103 creates a constraint equation for the upper and lower limits of the power flow of the branch, as shown in (Equation 4), using the phase difference angle δ and reactance X of the branch. The upper and lower limits of the branch power flow are determined by (Equation 4), which is the constraint equation for the upper and lower limits of the branch power flow, and system constrained economic load dispatch (SCED) with congestion management is realized.

[0087] (Creating constraints for piecewise linear approximation of fuel cost characteristics) The formulation generating unit 103 generates constraint equations (Equation 5) and (Equation 6) of the piecewise linear approximation equation of the fuel cost characteristic based on the fuel cost characteristic converted into an approximation function by piecewise linear approximation.

[0088] (Creating constraint equations for piecewise linear approximation of transmission loss characteristics) The formulation generating unit 103 generates constraint equations (Equation 7), (Equation 8), and (Equation 9) of the piecewise linear approximation equation of the transmission loss characteristic based on the transmission loss characteristic converted into an approximation function by piecewise linear approximation.

[0089] (Creating a linear objective function for minimizing power generation costs) The formulation generation unit 103 creates a linear objective function that minimizes the total power generation costs of the generators, based on the fuel cost characteristics converted into an approximate function using piecewise linear approximation and the transmission loss characteristics converted into an approximate function using piecewise linear approximation.

[0090] The formulation generating unit 103 generates an objective function shown in (Equation 10), for example.

number

[0091] The objective functions and constraint equations created by the formulation generation unit 103 are not limited to those described above. Any objective functions and constraint equations may be created by the formulation generation unit 103.

[0092] The generator control unit 104 creates power generation output data D2 and power generation output data D3. The power generation output data D2 and power generation output data D3 are created based on the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103. The generator control unit 104 performs economic dispatch optimization with grid constraints based on the formulated objective function and constraint equations, and calculates the power generation output data D2 and power generation output data D3.

[0093] The generator control unit 104 operates the initial adjustment generator that is related to the objective function and constraint equation of mathematical optimization created by the formulation generation unit 103, or other generators than the generator selected as the initial adjustment generator. The initial adjustment generator is a generator that is pre-selected for power adjustment in the power system. The generator control unit 104 adjusts the output of the initial adjustment generator using system-constrained economic dispatch, etc. System-constrained economic dispatch is also called SCED (Security Constrained Economic Dispatch).

[0094] In the electric power sector, a method known as economic load dispatching has traditionally been used, which uses mathematical optimization technology to determine the optimal output of generators. Economic load dispatching is also known as ELD (Economic Load Dispatch). A power system is structured in such a way that generators and loads are connected in a many-to-many manner using transmission lines and transformers. If the connection relationships of this structure are reflected in ELD, it will be possible to create a more practical power generation plan.

[0095] In recent years, research into an optimization technique called security constrained economic dispatch (SCED) has been progressing in the field of power generation planning. SCED is a general term for model algorithms that perform economic dispatch taking into account grid constraints.

[0096] When a candidate for a work system in an outage plan does not satisfy the system constraints, the existing ELD technology excludes that candidate. However, by applying SCED to operate the generators in the target power system, it is possible to change the power flow and keep the points where the power flow deviates within the range.

[0097] By manipulating generators in the power system, it is possible to adopt candidate working systems for outage plans that do not satisfy system constraints as working systems without excluding them. As a result, the number of system configurations that can be adopted as implementation plans increases. This reduces the work time required to create plans.

[0098] The generator control unit 104 performs grid-constrained economic dispatch optimization by manipulating the initial adjustment generators related to the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103, and generates power generation output data D2. The generator control unit 104 operates generators other than the generator selected as the initial adjustment generator, and generates power generation output data D3. The generator control unit 104 stores the power generation output data D2 in a power generation output DB 204 of the memory unit 20, and stores the power generation output data D3 in a power generation output DB 205.

[0099] In addition, the generator control unit 104 determines whether a solution exists for the objective function created by applying the power generation output data D2 to the system configuration data G2, or for the objective function created by applying the power generation output data D3 to the system configuration data G2.

[0100] The current distribution determining unit 105 determines whether there is a location of current deviation in the power flow calculation result data P1, the power flow calculation result data P2, or the power flow calculation result data P3.

[0101] The current distribution determination unit 105 determines whether there is a location of power flow deviation in the system related to the system configuration data G2, based on the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3 created by the power flow calculation execution unit 102. The system configuration data G2 is data related to a power system to be stopped, obtained by removing the equipment to be stopped, which is indicated in the equipment to be considered data G3, from the system configuration data G1.

[0102] The current distribution determining unit 105 transmits to the operation system determining unit 107 whether or not there is a location of current deviation in the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3.

[0103] The voltage distribution determining unit 106 determines whether there is a location of voltage deviation in the power flow calculation result data P1, the power flow calculation result data P2, or the power flow calculation result data P3.

[0104] The voltages appearing on the transmission lines, transformers, and busbars in the target power system are required to be below a predetermined upper limit and above a predetermined lower limit. The voltage distribution determination unit 106 transmits to the operation system determination unit 107 whether or not there are any locations with voltage deviations in the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3.

[0105] The work system determination unit 107 determines the power generation output data and system configuration data to be subjected to shutdown work. The power generation output data and system configuration data are determined based on the determined path record data RE stored in the determined path record DB 210. The determined path record data RE is data in which the paths of processing executed in a program described below are recorded. The processing unit 10 creates the determined path record data RE based on the processing steps of the program and stores it sequentially in the determined path record DB 210.

[0106] An example of the determination path record data RE is shown in Figure 5. As an example, the determination path record data RE indicates that it is possible to shut down the power transmission and distribution equipment to be shut down in cases 1, 3, and 5, and that it is not possible to shut down the power transmission and distribution equipment to be shut down in cases 2, 4, 6, and 7. The determination path record data RE also indicates processing related to grid measures for cases 3 to 7.

[0107] The work system determination unit 107 determines one of the power generation output data D1, the power generation output data D2, and the power generation output data D3, for which the current distribution determination unit 105 has not determined that there is a point of power flow deviation and the voltage distribution determination unit 106 has not determined that there is a point of voltage deviation, and the system configuration data G2, as the target for shutdown work.

[0108] The work system determination unit 107 stores the power generation output data D1, power generation output data D2, or power generation output data D3, which is not determined to have any areas of current deviation or voltage deviation, as power generation output data DE in the power generation output DB 209, and stores the system configuration data G2 as system configuration data GE in the system configuration DB 208.

[0109] In addition, the operation system determination unit 107 stores the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3, which is not determined to have any locations where power flow deviation or voltage deviation occurs, in the power flow calculation result DB207 as power flow calculation result data PE.

[0110] The operation system determination unit 107 transmits the power generation output data DE, which is not determined to include any locations of power flow deviation and voltage deviation, and the system configuration data GE to the output unit 50. The operation system determination unit 107 also transmits the determined path record data RE to the output unit 50.

[0111] The output unit 50 outputs the power generation output data DE and the system configuration data GE for the plants determined to be the targets of the shutdown work, and also outputs the determined path record data RE.

[0112] If all of the power flow calculation result data P1, power flow calculation result data P2, and power flow calculation result data P3 indicate a power flow deviation or a voltage deviation, the operation system determination unit 107 transmits to the output unit 50 a message indicating that the power generation output data D1, power generation output data D2, power generation output data D3, and system configuration data G2 are unsuitable for shutdown work. The operation system determination unit 107 also transmits determined path record data RE to the output unit 50.

[0113] The output unit 50 outputs information indicating that the power generation output data D1, the power generation output data D2, the power generation output data D3, and the system configuration data G2 are inappropriate for shutdown work. The output unit 50 also outputs the determined path record data RE.

[0114] The output unit 50 outputs the determined path record data RE whether the power generation output data D1, the power generation output data D2, the power generation output data D3, and the system configuration data G2 are appropriate or inappropriate as targets for shutdown work.

[0115] The operation of the power system shutdown plan creation support device 1 described above is realized by a program shown in Fig. 2. The program shown in Fig. 2 is stored in the processing unit 10 of the power system shutdown plan creation support device 1.

[0116] (Step S01: Load prediction and power generation prediction) The processing unit 10 receives power generation output data D1 from the power generation output DB 203 of the storage unit 20. The power generation output data D1 is input from an external device to the power generation output input unit 403 of the input unit 40 and stored in the power generation output DB 203 of the storage unit 20. The power generation output data D1 is data related to the generator output of the power system for which an outage plan is to be created. The processing unit 10 performs load prediction and power generation prediction for the power system based on the power generation output data D1.

[0117] (Step S02: Create system configuration data G2 by removing the designated equipment from the system configuration data G1) The processing unit 10 creates system configuration data G2 by removing the designated equipment from the system configuration data G1. The operation of step S02 is executed by the system configuration update unit 101 of the processing unit 10. The system configuration update unit 101 creates the system configuration data G2 based on the system configuration data G1 stored in the system configuration DB 201 and the considered equipment data G3 input from the considered equipment input unit 402.

[0118] The system configuration data G1 is input from an external device to the system configuration input section 401 of the input unit 40 and stored in the system configuration DB 201 of the storage unit 20. The system configuration data G1 is data indicating the configuration of the target power system. The considered equipment data G3 is input from an external device to the considered equipment input section 402 of the input unit 40 and transmitted to the system configuration update unit 101. The considered equipment data G3 indicates equipment to be shut down in the target power system. Equipment to be shut down includes transmission lines, transformers, busbars, etc. The considered equipment data G3 includes one or more pieces of equipment to be shut down.

[0119] The system configuration update unit 101 updates the system configuration data G1 to generate system configuration data G2. The system configuration update unit 101 removes the equipment to be shut down, which is indicated by the considered equipment data G3, from the system configuration data G1 to generate system configuration data G2. The system configuration data G2 may be represented by a power system model. The system configuration update unit 101 stores the generated system configuration data G2 in the system configuration DB 202. An example of the system configuration data G1 is shown in FIG. 3. An example of the system configuration data G2 in the case where the considered equipment data G3 indicates that branch E should be shut down is shown in FIG. 4.

[0120] (Step S03: Execute power flow calculation for the system configuration data G2 and power generation output data D1) The processing unit 10 performs a power flow calculation on the system configuration data G2 and the power generation output data D1. The operation in step S03 is performed by the power flow calculation execution unit 102 of the processing unit 10. The power flow calculation execution unit 102 applies the load prediction and the power generation prediction, which is the generator output, related to the power generation output data D1 received in step S01 to the system configuration data G2 created in step S02, and performs a power flow calculation.

[0121] The power flow calculation executing unit 102 performs power flow calculation on the system configuration data G2 and power generation output data D1 to create power flow calculation result data P1. The power flow calculation result data P1 is data of the power flow calculation related to the system configuration data G2, in which the equipment to be shut down has been removed from the system configuration data G1. The power flow calculation executing unit 102 stores the created power flow calculation result data P1 in the power flow calculation result DB 206.

[0122] (Step S04: Determine whether there is a point where the current is deviating) The processing unit 10 determines whether there is a point of power flow deviation based on the power flow calculation result data P1 created in step S03. The operation in step S04 is executed by the current distribution determination unit 105 of the processing unit 10.

[0123] Based on the power flow calculation result data P1, the current distribution determining unit 105 determines whether there is a point where power flow deviates in the system according to the system configuration data G2 obtained by removing the equipment to be shut down from the system configuration data G1.

[0124] If it is determined that there is a point where the power flow will deviate (YES in step S04), the program proceeds to step S05. If it is not determined that there is a point where the power flow will deviate (NO in step S04), the program proceeds to step S14.

[0125] (Step S05: Operate the generator for initial adjustment) If it is determined in step S04 that there is a point of power flow deviation, the processing unit 10 operates the initial adjustment generator in the system according to the system configuration data G2. The operation in step S05 is executed by the formulation generation unit 103 and the generator control unit 104 of the processing unit 10.

[0126] The formulation generation unit 103 generates an objective function and constraint equations for mathematical optimization of the target power system. The objective function and constraint equations for mathematical optimization are created based on the system configuration data G2 created in step S02. The formulation generation unit 103 transmits the objective function and constraint equations for mathematical optimization to the generator control unit 104.

[0127] The generator control unit 104 operates the initial adjustment generator related to the objective function and constraint equation of mathematical optimization created by the formulation generation unit 103. The initial adjustment generator is a generator selected in advance for power adjustment in the power system. As an example, the initial adjustment generator is generator M in the system configuration data G2 shown in FIG. 4. The generator control unit 104 adjusts the output of the initial adjustment generator using system-constrained economic dispatch or the like.

[0128] The generator control unit 104 performs economic dispatch optimization with grid constraints by manipulating the initial adjustment generators related to the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103, and creates new power generation output data D2. The generator control unit 104 stores the power generation output data D2 in the power generation output DB 204 of the storage unit 20.

[0129] (Step S06: Determine whether a solution exists for the objective function) The processing unit 10 determines whether a solution exists for the objective function obtained by applying the power generation output data D2 to the system configuration data G2. The operation in step S06 is executed by the generator control unit 104 of the processing unit 10.

[0130] The generator control unit 104 determines whether a solution exists for the objective function created in step S05 by applying the power generation output data D2 to the system configuration data G2. The power generation output data D2 is data related to the power generation output created by operating the initial adjustment generator. The system configuration data G2 is data indicating the system configuration after removing the equipment to be shut down.

[0131] If it is determined that a solution exists for the objective function (YES in step S06), the program proceeds to step S07. If it is determined that a solution does not exist for the objective function (NO in step S06), the program proceeds to step S09.

[0132] (Step S07: Update the power generation output data D1 to power generation output data D2) If it is determined in step S06 that there is a solution for the power flow calculation, the processing unit 10 updates the power generation output data D1 to generate power generation output data D2. The operation in step S07 is performed by the generator control unit 104. The generator control unit 104 updates the power generation output data D1 to generate power generation output data D2, which is then stored in the power generation output DB 204.

[0133] (Step S08: Apply the power generation output data D2 to the system configuration data G2 and perform a power flow calculation) The processing unit 10 applies the power generation output data D2 to the system configuration data G2 to perform the power flow calculation. The operation in step S06 is performed by the power flow calculation execution unit 102 of the processing unit 10.

[0134] The power flow calculation executing unit 102 applies the power generation output data D2 created in step S05 to the system configuration data G2 created in step S02 to execute a power flow calculation. The power generation output data D2 is data related to the power generation output created by operating the initial adjustment generator. The power flow calculation executing unit 102 executes a power flow calculation to create power flow calculation result data P2, and stores the created power flow calculation result data P2 in the power flow calculation result DB 206.

[0135] (Step S09: Operate all power supplies) If it is not determined in step S06 that a solution exists for the objective function, the processing unit 10 operates all power sources in the system according to the system configuration data G2. The operation in step S09 is executed by the formulation generation unit 103 and the generator control unit 104 of the processing unit 10.

[0136] The formulation generation unit 103 generates an objective function and constraint equations for mathematical optimization of the target power system. The objective function and constraint equations for mathematical optimization are created based on the system configuration data G2 created in step S02. The formulation generation unit 103 transmits the objective function and constraint equations for mathematical optimization to the generator control unit 104.

[0137] The generator control unit 104 operates all the power sources related to the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103. The all the power sources are all the generators arranged in the target power system. The initial adjustment generator is a generator selected in advance for power adjustment in the power system. The all the power sources are the generator selected as the initial adjustment generator and other generators of the generator selected as the initial adjustment generator. The all the power sources include the initial adjustment generator. As an example, the all the power sources are generator M and generator N in the system configuration data G2 shown in Figure 4. The generator control unit 104 adjusts the output of all the power sources using system-constrained economic dispatch, etc.

[0138] The generator control unit 104 performs economic dispatch optimization with grid constraints by manipulating all power sources related to the objective function and constraint equations of mathematical optimization created by the formulation generation unit 103, and creates new power generation output data D3. The generator control unit 104 stores the power generation output data D3 in the power generation output DB 205 of the storage unit 20.

[0139] (Step S10: Determine whether a solution exists for the objective function) The processing unit 10 determines whether a solution exists for the objective function obtained by applying the power generation output data D3 to the system configuration data G2. The operation in step S10 is executed by the generator control unit 104 of the processing unit 10.

[0140] The generator control unit 104 determines whether a solution exists for the objective function created in step S09 by applying the power generation output data D3 to the system configuration data G2. The power generation output data D3 is data related to the power generation output created by operating all power sources. The system configuration data G2 is data indicating the system configuration after removing the equipment to be shut down.

[0141] If it is determined that a solution exists for the objective function (YES in step S10), the program proceeds to step S11. If it is determined that a solution does not exist for the objective function (NO in step S10), the program proceeds to step S16.

[0142] (Step S11: Update the power generation output data D2 to generate power output data D3) If it is determined in step S10 that a solution exists for the objective function, the processing unit 10 updates the power generation output data D2 to generate power generation output data D3. The operation in step S11 is performed by the generator control unit 104. The generator control unit 104 updates the power generation output data D2 to generate power generation output data D3, which is then stored in the power generation output DB 205.

[0143] (Step S12: Apply the power generation output data D3 to the system configuration data G2 and perform a power flow calculation) The processing unit 10 applies the power generation output data D3 to the system configuration data G2 to perform the power flow calculation. The operation in step S12 is performed by the power flow calculation execution unit 102 of the processing unit 10.

[0144] The power flow calculation executing unit 102 applies the power generation output data D3 created in step S09 to the system configuration data G2 created in step S02 to execute a power flow calculation. The power generation output data D3 is data related to the power generation output created by manipulating all power sources in the target power system. The power flow calculation executing unit 102 executes the power flow calculation to create power flow calculation result data P3, and stores the created power flow calculation result data P3 in the power flow calculation result DB 206.

[0145] (Step S13: Determine whether there is a point where the current is deviating) The processing unit 10 determines whether there is a point where the power flow deviates based on the power flow calculation result data P3 created in step S12. The operation in step S13 is executed by the current distribution determination unit 105 of the processing unit 10.

[0146] Based on the power flow calculation result data P3, the current distribution determining unit 105 determines whether there is a point where power flow deviates in the system according to the system configuration data G2 obtained by removing the equipment to be shut down from the system configuration data G1.

[0147] If it is determined that there is a point where the current will deviate (YES in step S13), the program proceeds to step S16. If it is not determined that there is a point where the current will deviate (NO in step S13), the program proceeds to step S14.

[0148] (Step S14: Determine whether there is a point where the voltage deviates) The processing unit 10 determines whether or not there is a point where voltage deviation occurs based on the result of the executed power flow calculation. The operation in step S14 is executed by the voltage distribution determination unit 106.

[0149] If it is determined in step S04 that there is no point of power flow deviation, the voltage distribution determination unit 106 determines whether there is a point of voltage deviation using the power flow calculation result data P1; if it is determined in step S06 that there is a solution for the power flow calculation, the voltage distribution determination unit 106 determines whether there is a point of voltage deviation using the power flow calculation result data P2; and if it is determined in step S10 that there is a solution for the power flow calculation and it is not determined in step S13 that there is a point of power flow deviation, the voltage distribution determination unit 106 determines whether there is a point of voltage deviation using the power flow calculation result data P3.

[0150] The voltages appearing on the transmission lines, transformers, and busbars in the target power system must be below a predetermined upper limit and above a predetermined lower limit.

[0151] If it is determined that there is no point of power flow deviation (NO in step S14), the program proceeds to step S15. If it is determined that there is a point of voltage deviation (YES in step S14), the program proceeds to step S16.

[0152] (Step S15: Output data determined as a target for shutdown work) The processing unit 10 outputs the data determined as the target of the shutdown work from the output unit 50. The operation relating to step S15 is executed by the work system determination unit 107 of the processing unit 10.

[0153] The work system determination unit 107 determines the power generation output data and system configuration data to be subject to shutdown work. If it is determined in step S14 that there is no location of voltage deviation, the work system determination unit 107 stores the power generation output data D1, the power generation output data D2, or the power generation output data D3 as power generation output data DE in the power generation output DB 209, and stores the system configuration data G2 as system configuration data GE in the system configuration DB 208. The power generation output data DE and the system configuration data GE are data determined to be subject to shutdown work.

[0154] In addition, the operation system determination unit 107 stores the power flow calculation result data P1, power flow calculation result data P2, or power flow calculation result data P3, which is not determined to have any locations where power flow deviation or voltage deviation occurs, in the power flow calculation result DB207 as power flow calculation result data PE.

[0155] The work system determination unit 107 causes the power generation output data DE and system configuration data GE determined as targets for shutdown work to be output from the output unit 50. The output unit 50 outputs the power generation output data DE and system configuration data GE determined as targets for shutdown work.

[0156] (Step S16: Output a message that the system configuration data is inappropriate) The processing unit 10 causes the output unit 50 to output information indicating that the system configuration data is inappropriate for the shutdown work. The operation in step S16 is executed by the work system determination unit 107 of the processing unit 10.

[0157] If it is determined in step S14 that there is a location of power flow deviation, if it is determined in step S10 that there is no solution for the power flow calculation, or if it is determined in step S13 that there is a location of power flow deviation, the work system determination unit 107 causes the output unit 50 to output information that the power generation output data D1, the power generation output data D2, the power generation output data D3, and the system configuration data G2 are unsuitable for shutdown work. The output unit 50 outputs information that the power generation output data D1, the power generation output data D2, the power generation output data D3, and the system configuration data G2 are unsuitable for shutdown work.

[0158] (Step S17: Output the judged path record data RE) The processing unit 10 outputs the determination path record data RE from the output unit 50. The operation relating to step S17 is executed by the operation system determination unit 107 of the processing unit 10.

[0159] The determined path record data RE is data that records the path of processing executed in the program. The determined path record data RE sequentially records the processing steps of the program related to the power generation output data D1, the power generation output data D2, and the power generation output data D3. The work system determination unit 107 outputs the determined path record data RE from the output unit 50 regardless of whether the power generation output data D1, the power generation output data D2, the power generation output data D3, and the system configuration data G2 are appropriate or inappropriate for shutdown work. The output unit 50 outputs the determined path record data RE.

[0160] The above is the operation of the power system shutdown plan creation support device 1 according to this embodiment.

[0161] The processing by the power flow calculation execution unit 102 may be referred to as a power flow calculation execution step or a power flow calculation execution procedure, the processing by the current distribution determination unit 105 as a current distribution determination step or a current distribution determination procedure, and the processing by the generator control unit 104 as a generator control step or a generator control procedure.

[0162] [1-3.Effects] (1) According to this embodiment, the power system shutdown plan creation support device 1 includes a power flow calculation execution unit 102 that executes a power flow calculation by applying first power generation output data D1, which is data related to the output of generators that supply power to the power system, to system configuration data G2 that indicates the configuration of the suspended power system. The system configuration data G2 is created by removing the power transmission and distribution equipment that is related to the considered equipment data G3 that indicates the transmission and distribution equipment that is to be shut down from the power system that is related to the system configuration data G1 that indicates the configuration of the power system that is the target of the shutdown plan. The power system shutdown plan creation support device 1 includes a power flow calculation execution unit 102 that executes a power flow calculation by applying first power generation output data D1, which is data related to the output of generators that supply power to the power system. The power flow calculation execution unit 102 executes a power flow calculation by applying first power generation output data D1, which is data related to the output of generators that supply power to the power system. The power system shutdown plan creation support device ... suspended power system, to system configuration data G2 that indicates the configuration of the suspended power system. The power system shutdown plan creation support device 102 executes a power flow calculation by applying first power generation output data D1, which is data related to the output of generators that supply power to the suspended power system, to the system configuration data G2. The power system shutdown plan creation support device 104 executes a power flow calculation by applying first power generation output data D1, which is data related to the output of generators that supply power to the suspended power system, to the system configuration

[0163] When it is determined that there is a point of power flow deviation in the suspended power system, the generator control unit 104 adjusts the output of the generator arranged in the suspended power system and creates second power generation output data D2, so that it is possible to adopt the configuration of the suspended power system according to the system configuration data G2 and the output of the generator according to the power generation output data D2 as the target of the shutdown work without giving up on shutting down the power transmission and distribution equipment according to the considered equipment data G3. This allows the shutdown work to be carried out quickly.

[0164] (2) The generator control unit 104 of the power system shutdown plan creation support device 1 adjusts the output of a generator that has been selected in advance as an initial adjustment generator in the shutdown power system and creates second power generation output data D2. This prevents the output of a generator that has not been selected as an initial adjustment generator from being adjusted, and allows the configuration of the shutdown power system according to the system configuration data G2, which provides a more stable supply of power, and the output of the generator according to the power generation output data D2 to be adopted.

[0165] (3) When the generator control unit 104 of the power system shutdown plan creation support device 1 determines that there is no solution to the objective function created by applying the second power generation output data D2, created by adjusting the output of a generator previously selected as an initial adjustment generator, to the system configuration data G2, which indicates the configuration of the power system to be shut down, the generator control unit 104 adjusts the output of the generator previously selected as an initial adjustment generator and other generators to create third power generation output data D3.This makes it possible to adopt the configuration of the power system to be shut down according to the system configuration data G2 and the output of the generator according to the power generation output data D3 as the target of the shutdown work without giving up on shutting down the transmission and distribution equipment according to the considered equipment data G3.This allows the shutdown work to be carried out quickly.

[0166] (4) The power system shutdown plan creation support device 1 has an operation system determination unit 107 that outputs the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3 that are determined to be appropriate as targets for shutdown work, and system configuration data G2 that indicates the configuration of the suspended power system, based on the judgment path record data RE that indicates the program processing steps related to the process of applying the first power generation output data D1 to perform a power flow calculation, the process of applying the second power generation output data D2 to perform a power flow calculation, or the process of applying the third power generation output data D3 to perform a power flow calculation.Since the operation system determination unit 107 outputs the judgment path record data RE, it is possible to more quickly adopt the configuration of the suspended power system related to the system configuration data G2 and the generator output related to the power generation output data D1, D2, or D3 as targets for shutdown work.

[0167] The work system determination unit 107 outputs the determined path record data RE, and therefore can inform the worker of the configuration of the shutdown power system according to the system configuration data G2 and the processing process of the generator output according to the power generation output data D1, D2, or D3. The work system determination unit 107 outputs the determined path record data RE both when the power generation output data D1, D2, D3, and the system configuration data G2 are appropriate or inappropriate as targets for shutdown work.

[0168] Even if the data is inappropriate, the operator can know the processing process as so-called negative information. By referring to the determination path record data RE, the operator can more quickly select the configuration of the power system to be shut down and the power output to be used for shutdown work from the next time onwards.

[0169] (5) The power system shutdown plan creation support device 1 has a voltage distribution determination unit 106 that determines whether there are any points where the voltage deviates from a predetermined voltage range when the first power generation output data D1, or the second power generation output data D2 and third power generation output data D3 created by the generator control unit 104, are applied to the configuration of the suspended power system, and the work system determination unit 107 determines that the first power generation output data D1, the second power generation output data D2, or the third power generation output data D3 that have been determined by the voltage distribution determination unit 106 to have no points where the voltage deviates, and the data indicating the configuration of the suspended power system, are appropriate as targets for shutdown work, and therefore it is possible to adopt a configuration of the suspended power system and generator output that provides a more stable supply of power.

[0170] 2. Other Embodiments Although embodiments including modifications have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims. The following is an example.

[0171] (1) In the above embodiment, when the generator control unit 104 of the power system shutdown plan creation support device 1 determines that there is no solution to the objective function created by applying the second power generation output data D2, which is created by adjusting the output of the generator selected in advance as the initial adjustment generator, to the system configuration data G2 indicating the configuration of the power system to be shut down, the generator control unit 104 adjusts the output of a generator other than the generator selected in advance as the initial adjustment generator to create the third power generation output data D3. However, the power system shutdown plan creation support device 1 may also be configured to create either the second power generation output data D2 or the third power generation output data D3.

[0172] For example, if the generator control unit 104 determines that there is no solution to the objective function created by applying the second power generation output data D2 to the system configuration data G2 that indicates the configuration of the power system to be shut down, the power system shutdown plan creation support device 1 may output, via the work system determination unit 107, a message indicating that the power generation output data D2 and the system configuration data G2 are inappropriate as targets for shutdown work.

[0173] For example, if the current distribution determination unit 105 determines that there is a point of power flow deviation in the power flow calculation performed by applying the first power generation output data D1 to the system configuration data G2 indicating the configuration of the suspended power system, the power system suspension plan creation support device 1 may adjust the output of the generator selected in advance as the initial adjustment generator and other generators using the generator control unit 104, and create third power generation output data D3.

[0174] (2) In the above embodiment, as an example, the system configuration update unit 101 stops one branch in the system configuration data G1 to create the system configuration data G2. However, the system configuration data G2 created by the system configuration update unit 101 is not limited to the data in which one branch is stopped. The system configuration data G2 may also be the data in which multiple branches are stopped. Furthermore, the system configuration data G2 may be the data in which a transformer, a bus, or other power transmission and distribution equipment is arranged in the power system.

[0175] (3) In the above embodiment, as an example, the processing unit 10 stops one branch in the system configuration data G1, adjusts the power generation output for the system configuration data G2 using the generator control unit 104, and creates the power generation output data D2 and D3. However, the processing unit 10 may create multiple system configuration data by stopping branches, transformers, and busbars in the system configuration data G1, and the generator control unit 104 may sequentially adjust the power generation output for the multiple system configuration data to create the power generation output data.

[0176] (4) In the above embodiment, the storage unit 20 is provided inside the power system shutdown plan creation support device 1. However, the storage unit 20 may be provided outside the power system shutdown plan creation support device 1. For example, the storage unit 20 may be provided in a server or cloud outside the power system shutdown plan creation support device 1. [Explanation of symbols]

[0177] 1. Power system shutdown planning support device 10 Processing section 101...System configuration update section 102 Power flow calculation execution unit 103...Formulation generator 104 Generator control unit 105...Current distribution determination section 106 Voltage distribution determination unit 107 Work System Determination Section 20...Storage section 201···System Configuration Database 202···System Configuration Database 203 Power Generation Output Database 204 Power Generation Output Database 205···Power Output Database 206 Power flow calculation result database 207 Power flow calculation result database 208···System Configuration Database 209 Power Generation Output Database 210···Decision path record database 40 Input section 401 System configuration input section 402: Equipment input section 403 Power generation output input section 50 Output section

Claims

1. a power flow calculation execution unit that executes a power flow calculation by applying first power generation output data, which is data related to the output of a generator that supplies power to the power system, to data indicating the configuration of the power system that is to be suspended, the data being created by removing the power transmission and distribution equipment that is related to the data indicating the configuration of the power system that is the target of the suspension plan from the power system that is related to the data indicating the configuration of the power system that is the target of the suspension plan; a current distribution determination unit that determines whether there is a point where power flow deviation occurs in the power flow calculation related to the configuration of the stopped power system executed by the power flow calculation execution unit; a generator control unit that adjusts an output of a generator arranged in the suspended power system and creates second power generation output data when the current distribution determination unit determines that there is a location of power flow deviation in the suspended power system. A power system shutdown planning support device.

2. the generator control unit adjusts the output of the generator selected in advance as an initial adjustment generator in the stopped power system, and creates the second power generation output data. The power system shutdown plan creation support device according to claim 1.

3. When the generator control unit determines that there is no solution in the objective function created by applying the second power generation output data created by adjusting the output of the generator selected in advance as the initial adjustment generator to the data indicating the configuration of the suspended power system, adjusting the outputs of the generator selected in advance as a generator for initial adjustment and the other generators to create third power generation output data; The power system shutdown plan creation support device according to claim 2.

4. an operation system determination unit that outputs the first power generation output data, the second power generation output data, or the third power generation output data that has been determined to be appropriate as a target for shutdown work, and data indicating the configuration of the shutdown power system, based on determination path record data that indicates the processing steps of a program related to the processing of performing a power flow calculation by applying the first power generation output data, the processing of performing a power flow calculation by applying the second power generation output data, or the processing of performing a power flow calculation by applying the third power generation output data; the operation system determination unit outputs the determination path record data. The power system shutdown plan creation support device according to claim 3.

5. a voltage distribution determination unit that determines whether there is a location where a voltage deviates from a predetermined voltage range when the first power generation output data, or the second power generation output data and the third power generation output data created by the generator control unit, is applied to the configuration of the suspended power system; the work system determination unit determines that the first power generation output data, the second power generation output data, or the third power generation output data, for which it has been determined by the voltage distribution determination unit that there are no locations of voltage deviation, and the data indicating the configuration of the power system to be shut down, are appropriate targets for shutdown work; The power system shutdown plan creation support device according to claim 4.

6. On the computer, a power flow calculation execution step of executing a power flow calculation by applying first power generation output data, which is data related to the output of a generator supplying power to the power system, to data indicating the configuration of the power system that is to be suspended, the data being created by removing the power transmission and distribution equipment related to the data indicating the power transmission and distribution equipment to be suspended from the power system related to the data indicating the configuration of the power system that is the target of the suspension plan; a current distribution determination step of determining whether there is a point of power flow deviation in the power flow calculation related to the configuration of the stopped power system executed in the power flow calculation execution step; a generator control step of adjusting an output of a generator arranged in the suspended power system and creating second power generation output data when it is determined in the current distribution determination step that there is a location of power flow deviation in the suspended power system. A computer program for a power system shutdown plan creation support device.

7. a power flow calculation execution procedure for executing a power flow calculation by applying first power generation output data, which is data related to the output of a generator supplying power to the power system, to data indicating the configuration of the power system that is to be suspended, the data being created by removing the power transmission and distribution equipment related to the data indicating the power transmission and distribution equipment to be suspended from the power system related to the data indicating the configuration of the power system that is the target of the suspension plan; a current distribution determination step of determining whether there is a point of power flow deviation in the power flow calculation related to the configuration of the stopped power system executed by the power flow calculation execution step; a generator control procedure for adjusting an output of a generator arranged in the suspended power system and creating second power generation output data when it is determined by the current distribution determination procedure that there is a location of power flow deviation in the suspended power system. A method for supporting the creation of power system outage plans.

Images