JP7172186B2 - Free space calculation device, free space calculation method, and program - Google Patents

Description

The present invention relates to a free space calculation device, a free space calculation method, and a program.

Conventionally, a system for controlling power equipment connected to a power system is known (see, for example, Patent Documents 1 and 2).
Patent Document 1 WO2016-157577 Patent Document 2 Japanese Patent Laid-Open No. 2007-108526

When connecting new power equipment to the power system, the free capacity of power transmission and distribution equipment such as transmission lines may be calculated. It is preferable that the free capacity of a power transmission line or the like can be calculated with high accuracy.

In order to solve the above problems, a first aspect of the present invention provides a free capacity calculation device for calculating the free capacity of transmission lines included in a power system. The available capacity calculation device may include a capacity information acquisition unit that acquires capacity information indicating a usable capacity corresponding to the installed capacity of the target transmission line for which the available capacity is to be calculated. The available capacity calculation device may include an operation information acquisition unit that acquires first operation information indicating the operation status of the target transmission line. The free capacity calculation device calculates, based on the first operation information, the power at the time of failure that is expected to flow through the target transmission line when a non-target transmission line other than the target transmission line among the transmission lines included in the power system fails. A power-at-failure calculator may be provided. The available capacity calculation device may include a available capacity calculation unit that calculates the available capacity based on the available capacity and the power at the time of failure.

The operation information acquisition unit may acquire second operation information indicating the operation status of the non-target power transmission line. The failure power calculation unit may calculate the failure power based on the second operational information.

The free capacity calculation unit may calculate the difference between the usable capacity and the fault power as the free capacity when the fault power is smaller than the usable capacity.

The available capacity calculation device may include a connection determining unit that determines whether or not the new facility can be connected based on the estimated usage of the new facility and the available capacity of the transmission line when the new facility is connected to the power system.

If the estimated usage of the new equipment is greater than the available capacity, the connection determination unit will reduce the usage of the new equipment to the power system of the new equipment, at least until the usage of the new equipment is less than the available capacity. connection.

The connection determination unit may permit connection of the new equipment to the power system on the condition that the amount of use of the new equipment is suppressed when a failure occurs in the non-target transmission line.

A second aspect of the present invention provides a free capacity calculation method for calculating the free capacity of a transmission line included in a power system by a computer. The available capacity calculation method may include a capacity information acquisition step of acquiring capacity information indicating a usable capacity corresponding to the installed capacity of the target transmission line for which the available capacity is to be calculated. The available capacity calculation method may comprise an operational information obtaining step of obtaining first operational information indicating the operational status of the target transmission line. The method of calculating the free capacity is based on the first operation information to calculate the power at the time of failure that is expected to flow through the target transmission line when a non-target transmission line other than the target transmission line among the transmission lines included in the power system fails. A fault power calculation stage may be provided. The free capacity calculation method may include a free capacity calculation step of calculating free capacity based on the available capacity and the failure power.

A third aspect of the present invention provides a program for causing a computer to execute the free space calculation method according to the second aspect.

It should be noted that the above summary of the invention does not list all the necessary features of the invention. Subcombinations of these feature groups can also be inventions.

1 is a block diagram showing an example of a free space calculation device 100 according to one embodiment of the present invention; FIG. It is a figure which shows an example of the system model 200 of a power system. It is a figure explaining the free capacity in a target power transmission line. It is a figure explaining the free space in a comparative example. FIG. 4 is a diagram showing each step in a free capacity calculation method for calculating the free capacity of a target transmission line; FIG. 10 is a diagram showing another example of the free space calculation device 100; It is a figure which shows an example of the suppression conditions imposed on new equipment. It is a figure which shows an example of the suppression conditions imposed on new equipment. 8 is a diagram showing another example of free space calculated by the free space calculating unit 108. FIG. 8 is a diagram showing another example of free space calculated by the free space calculating unit 108. FIG. It is a figure which shows an example of the suppression conditions imposed on new equipment. It is a figure which shows an example of the management apparatus 802 which manages an electric power system. An example computer 2200 is shown in which aspects of the present invention may be embodied in whole or in part.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 is a block diagram showing an example of a free space calculation device 100 according to one embodiment of the invention. The available capacity calculation device 100 calculates the available capacity of transmission lines included in a power system. The free capacity of a transmission line refers to the amount of power that is allowed as the amount of power that can additionally flow through the transmission line. For example, a transmission line is set with an installed capacity, which is the limit of electric power that does not cause thermal damage to the transmission line. The free capacity of the transmission line may be the capacity corresponding to the difference between the installed capacity and the predetermined operating capacity. As used herein, operational capacity is the power capacity currently used or expected to be used on the transmission line.

The available capacity calculation device 100 includes a capacity information acquisition unit 102 , an operation information acquisition unit 104 , a failure time power calculation unit 106 , and a free capacity calculation unit 108 . The capacity information acquisition unit 102 acquires capacity information of a target transmission line for which the free capacity is to be calculated, among the transmission lines included in the power system. The target transmission line may be specified by an administrator or the like of the available capacity calculation device 100, may be specified by a device different from the available capacity calculation device 100, and may be selected by the available capacity calculation device 100 based on a predetermined condition. good too. The capacity information is information indicating the usable amount according to the installed capacity of the target transmission line. For example, the available capacity is the capacity obtained by dividing the installed capacity by a predetermined margin amount.

The available capacity calculation device 100 may further include a system information storage unit that stores system model information. The system model information includes information on the installed capacity of each transmission line included in the power system. The system model information may include information indicating electrical characteristics of each facility included in the power system. Power system facilities include power transmission and distribution facilities such as transmission lines and transformers, and power facilities such as power generation facilities and load facilities. The capacity information acquisition unit 102 may extract information on the installed capacity of the target transmission line from the system model information.

The operation information acquisition unit 104 acquires first operation information indicating the operation status of the target transmission line. The operating status of the target transmission line may be a status indicating how much power flows through the target transmission line. The first operational information may include the actual value of power that has flowed through the target transmission line in the past. The first operational information may include an operational plan for one or more power facilities that may affect power flowing through the target transmission line. The first operational information may include an average value of power that has flowed or is assumed to flow in the target transmission line in a predetermined period, and may include a maximum value. The first operational information may include information on power currently flowing through the target transmission line.

The failure power calculation unit 106 calculates an assumed value of failure power flowing through the target transmission line when a non-target transmission line included in the power system fails. The non-target transmission line refers to a transmission line other than the target transmission line among the transmission lines included in the power system. The failure power calculation unit 106 calculates an assumed value of the failure power flowing through the target transmission line based on the first operation information.

The failure of non-target transmission lines includes not only the failure of the transmission line itself, but also the failure of incidental equipment such as transformers connected to the transmission line to prevent power from flowing through the transmission line. In an electric power system, when power cannot flow through one of the transmission lines, power may be transmitted and distributed by bypassing the transmission line. In such a case, the amount of power flowing through transmission lines other than the failed transmission line increases. As an example, the power during a fault that flows through the target transmission line can be calculated from the operating capacity that normally flows through the target transmission line and the assumed value of the power that increases at the time of the fault. The failure power calculation unit 106 may calculate the power that normally flows through the target transmission line based on the first operation information. The power increase at the time of failure may be calculated by power flow calculation based on the operation status of the non-target transmission line, may use a preset increase amount, or may use an increase amount obtained by other methods.

The available capacity calculation unit 108 calculates the available capacity of the target transmission line based on the available capacity of the target transmission line calculated by the capacity information acquisition unit 102 and the power at failure of the target transmission line calculated by the power at failure calculation unit 106. Calculate capacity. The available capacity calculation unit 108 may calculate the available capacity based on the difference between the available capacity and the power at failure. Since the available capacity calculation device 100 of this example calculates the available capacity based on the operating capacity of the transmission line, it can accurately calculate the available capacity.

FIG. 2 is a diagram showing an example of a system model 200 of a power system. The available capacity calculation device 100 calculates the available capacity of at least one transmission line 208 included in the system model 200 . The capacity information acquisition unit 102 may acquire system model information of the system model 200 . The system model information may include information modeling each of the plurality of power transmission and distribution facilities such as the transmission line 208 and the transformer 206 included in the power system, the plurality of power generation facilities 202, and the plurality of load facilities 210. . The system model information may include at least one of location information, electrical connection relationships, and electrical characteristics of each piece of equipment. The electrical characteristics of the transmission and distribution equipment may include the installed capacity and impedance of the transmission and distribution equipment.

The failure power calculation unit 106 performs power flow calculation based on the virtual model information, and calculates the power flowing to each node of the power system, the voltage and current of each node, etc. when at least one non-target transmission line fails. By doing so, the power at failure of the target transmission line is calculated. For example, if power line 208-2 fails, power that was flowing on power line 208-2 will flow through power lines 208-4, 208-7 and 208-5 to bypass power line 208-2. can be done. In such a case, the power flowing through transmission lines 208-4, 208-7 and 208-5 increases compared to normal times. The failure power calculation unit 106 calculates the power flowing through the target transmission line by power flow calculation when one of the non-target transmission lines fails.

The virtual model information may include information on active power and reactive power generated by each power generation facility 202 . The virtual model information may include voltage and current magnitude, phase and frequency information at each node. The virtual model information may include information such as power consumed by each load facility. The virtual model information may include information indicating the past operation status of each power facility. The virtual model information may include information indicating a future operation plan for each power facility. For power flow calculation, for example, the L method of the Central Research Institute of Electric Power Industry can be used, but the method of power flow calculation is not limited to this.

The failure power calculation unit 106 may calculate the power flowing through the target transmission line at the time of a single equipment failure (N-1 failures) as the failure power. A single equipment failure refers to a failure of a single equipment among equipment such as the transmission line 208 and the transformer 206 of the power system. The failure power of the target transmission line at the time of a single equipment failure refers to the maximum power among the power flowing through the target transmission line when any one of the equipment included in the power system fails. However, power at fault is not limited to the power at the time of a single equipment failure. The failure time power may be calculated from the power flowing through the target transmission line when the facility fails.

FIG. 3 is a diagram for explaining the free capacity in the target transmission line. In FIG. 3, the horizontal axis indicates time, and the vertical axis indicates power (W) flowing through the target transmission line. On the vertical axis, the installed capacity of the target transmission line is taken as 100%. The installed capacity is the capacity that is set as the maximum power that can flow through the target transmission line, taking into account thermal damage and the like of the target transmission line.

The capacity information acquisition unit 102 acquires information about the available capacity of the target transmission line from the system model information. The usable amount is the amount set as the usable capacity out of the installed capacity of the target transmission line. The available amount may be the installed capacity minus a predetermined margin. The margin is less than 50%. The margin may be 20% or less, or 10% or less. The margin in this example is 5% of installed capacity. The margin may be 0. The capacity information acquisition unit 102 may acquire information indicating the available capacity, and may acquire information indicating the installed capacity. The capacity information acquisition unit 102 may acquire information indicating the margin to be secured, and information indicating the margin to be secured may be set in advance. The margin may be set for each transmission line 208 .

The operation information acquisition unit 104 acquires information about the operation capacity of the target transmission line. The information may be included in the system model information. The operation information acquisition unit 104 of this example acquires the actual value (actual usage value) of the power that flowed through the target transmission line during a predetermined period in the past. For example, the operation information acquisition unit 104 acquires the actual usage value in the most recent predetermined period. In another example, the operation information acquisition unit 104 may acquire actual usage values for a predetermined period of one year over a plurality of years, and may acquire actual usage values for a predetermined period of one month over multiple months. Well, actual usage values for a predetermined period of one week may be obtained over a plurality of weeks, and actual usage values for a predetermined period of one day may be obtained for multiple days.

The operational information acquisition unit 104 of this example calculates the operational capacity based on the acquired actual usage value. The operational information acquisition unit 104 may determine the operational capacity according to the maximum actual usage value, may determine the operational capacity according to the average actual usage value, or may determine the operational capacity by another method. may In the example of FIG. 3, the operational information acquisition unit 104 sets the maximum actual usage value in a predetermined period as the operational capacity. However, the operational capacity acquired by the operational information acquiring unit 104 is not limited to that using the actual usage value. The operation information acquisition unit 104 may calculate an assumed value of power that will flow in the target transmission line in the future based on the operation plan of each piece of equipment. The operational information acquisition unit 104 may calculate the operational capacity using the assumed value.

The failure power calculation unit 106 of this example calculates the failure power based on the second operation information indicating the operation status of at least one non-target transmission line. The second operational information may be acquired by the operational information acquisition unit 104 . The operation information acquisition unit 104 may acquire the operation status of all the power transmission lines 208 included in the power system. You may selectively acquire the operation status of The second operational information may include an actual value of power that has flowed in the non-target transmission line in the past. The second operational information may include an average value of the power that has flowed through the non-target transmission line during a predetermined period, and may include a maximum value. The second operational information may include information on power currently flowing on the non-target transmission line. The operation information acquisition unit 104 may calculate the second operation information based on the operation plan of each facility included in the power system.

The failure power calculation unit 106 performs a power flow calculation based on the system model information and the operation information of each transmission line 208, and calculates an assumed value of the failure power flowing through the target transmission line when a predetermined equipment failure occurs. calculate. The failure power calculation unit 106 calculates the failure operation capacity based on the assumed value. The operational capacity at failure is the capacity of power that is assumed to flow through the target transmission line when a predetermined failure occurs. The failure power calculation unit 106 may set the maximum value of the assumed value of the power at failure as the operating capacity at failure, may determine the operating capacity at failure according to the average value of the expected values of power at failure, and other methods. may determine the operational capacity at failure.

When the maximum value of power during failure (operating capacity during failure in this example) is smaller than the usable amount, the free capacity calculation unit 108 calculates the difference between the usable amount and the maximum value of power during failure as the free capacity. do. According to this example, the free capacity of the target power transmission line is calculated according to the operation status of each power transmission line 208, so the free capacity of the target power transmission line can be calculated with high accuracy.

FIG. 4 is a diagram for explaining free space in a comparative example. In the comparative example, the operating capacity of the target transmission line is determined based on the rated capacity of the equipment connected to the target transmission line. For example, when a plurality of power generation facilities 202 are connected to the target transmission line, the operating capacity is the capacity of the current flowing through the target power transmission line when each power generation facility 202 generates the rated power generation (maximum power generation). . However, it is extremely rare for all the power generation equipment 202 to generate the rated power. For this reason, the operating capacity in the comparative example becomes considerably larger than the actual actual usage amount.

Generally, in each transmission line, about 50% of the installed capacity is set as a capacity to be secured at failure (expected increase at failure). With such a setting, even if one of the two transmission lines fails, the other transmission line can transmit power for the two transmission lines. However, when one transmission line fails, it is extremely rare for the power increase on the other transmission line to reach 50% of the installed capacity. For this reason, the secured amount at the time of failure in the comparative example becomes considerably larger than the actual expected increase at the time of failure. Therefore, the free capacity obtained by subtracting the operating capacity and the secured capacity at failure time from the installed capacity is very small, and is zero in most cases. On the other hand, according to the embodiment described in FIGS. 1 to 3, the free capacity of the target power transmission line is calculated according to the operation status of each power transmission line 208, so the free capacity of the target power transmission line is calculated with high accuracy. can.

FIG. 5 is a diagram showing each step in the available capacity calculation method for calculating the available capacity of the target transmission line. First, the CIM is obtained as an example of the model information of the electric power system (S502). CIM is a common information model defined by International Electrotechnical Commission Standard 61970. The CIM includes attributes such as the type of each facility included in the power system, electrical characteristics, connection relationships of each facility, and the like. The CIM may include capacity information for each transmission line 208 .

Also, the model of each power generation facility is acquired (S504). The model may be included in the CIM or obtained separately. The model of each power generation facility includes the frequency, phase, etc. of the power output by the power generation facility.

Also, the power generation plan of each power generation facility is acquired (S506). A power generation plan may be obtained from a management system that manages each power generation facility. The processes of S502, 504, and 506 may be performed in any order, or may be performed simultaneously.

Next, using at least part of the information acquired in the processes of S502 and S506, the initial power flow state of the power system model is determined by power flow calculation (S508). The initial power flow state is, for example, the state of power, voltage and current values at each node of the power system in a steady state after a fault occurs. The initial power flow state includes the state of power flowing through the target transmission line (fault power). The initial power flow state can be calculated using, for example, the L method (power flow calculation program) of the Central Research Institute of Electric Power Industry.

Next, using at least part of the information acquired in S502 to S508, a transient stability model of the power system model is constructed (S510). The transient stability model is a model for calculating whether or not each facility can stably continue operation when a predetermined state change occurs in the power system. The transient stability model can be calculated using, for example, the Y method (transient stability analysis program) of the Central Research Institute of Electric Power Industry.

Next, using at least part of the information acquired in S502 to S510, the free capacity of the target transmission line is calculated (S512). For example, the free capacity of the target transmission line is calculated based on the capacity information of the target transmission line acquired in S502 and the failure power of the target transmission line calculated in S508.

In S512, the free capacity of the target transmission line may be calculated further based on the transient stability model acquired in S510. For example, in S512, based on the transient stability model, the limit value of the free capacity that can maintain the frequency stable, the limit value of the free capacity that can maintain the voltage stable, and the limit value of the free capacity that can maintain the synchronization of each equipment Calculate at least one of In S512, the minimum available capacity may be used between the available capacity determined according to the installed capacity and the available capacity determined based on the transient stability model.

FIG. 6 is a diagram showing another example of the free space calculation device 100. As shown in FIG. The available capacity calculation device 100 of this example includes a connection determination unit 110 and a suppression condition storage unit 112 in addition to the configuration of the available capacity calculation device 100 described with reference to FIGS. 1 to 5 .

When a power generation facility is newly connected to the electric power system, the connection determination unit 110 determines whether or not the connection is possible based on the capacity (assumed usage) of the power transmission line 208 used by the new facility and the free capacity of the power transmission line 208. judge. The connection determination unit 110 may permit the new equipment to be connected to the power system when the estimated usage is smaller than the free capacity.

In another example, the connection determination unit 110 may connect the new equipment to the power system if the new equipment allows a predetermined suppression condition even when the estimated usage is greater than the free capacity. may be allowed. For example, the suppression condition may be a condition for suppressing the power that the new equipment outputs to the power system during normal times when there is no failure in the power system, within the range of the free capacity of the transmission line 208 . The suppression condition may be a condition for suppressing the power output from the new equipment to the power system in the event of a failure occurring in the power system, within a predetermined range.

The restraint condition storage unit 112 stores the restraint condition applied to the equipment when the new equipment is connected. The suppression condition storage unit 112 may notify the controller of the new equipment of a command to suppress the power generation amount of the new equipment according to the suppression condition.

FIG. 7 is a diagram showing an example of restraint conditions applied to new equipment. In the new equipment of this example, the amount of power to be output to the power system (estimated usage) is smaller than the free capacity of the transmission line 208 to which the new equipment is connected. In this case, the connection determination unit 110 notifies the management system of the new facility of the conditions for suppressing the usage of the facility. The suppression condition is a condition for suppressing the usage of the new equipment at least until the usage of the transmission line 208 by the new equipment becomes equal to or less than the free capacity of the transmission line 208 . The connection determination unit 110 permits the connection of the new equipment to the power system when the conditions are permitted. The suppression condition storage unit 112 stores the conditions.

Further, when connecting the new equipment to the power system, the connection determination unit 110, according to the operation status of the power transmission line 208, sets the conditions for suppressing the power output by the new equipment to the power system to the management system of the new equipment. may notify you. The connection determination unit 110 permits connection of the new equipment to the electric power system when the manager or the like of the new equipment permits the condition.

FIG. 8 is a diagram showing an example of restraint conditions imposed on new equipment. The suppression condition of this example is that if the current usage of the transmission line 208 by the existing equipment exceeds the operating capacity set according to the actual usage value etc., the usage of the new equipment is suppressed. It is a condition to As usage by existing equipment increases, usage of transmission line 208 by existing and new equipment may exceed available capacity. In such a case, the connection determination unit 110 may permit the new equipment to be connected to the power system on the condition that the output is suppressed. For the power equipment that allows the condition, that effect is stored in the suppression condition storage unit 112 .

FIG. 9 is a diagram showing another example of the free space calculated by the free space calculating unit 108. In FIG. When the power at the time of failure flowing through the power transmission line 208 is smaller than the usable capacity of the power transmission line 208, the free capacity calculation unit 108 of this example calculates the difference between the usable capacity of the power transmission line 208 and the operating capacity of the existing equipment. capacity. In this case, the new facility may be given a suppression condition for suppressing the output as necessary. For example, the suppression condition is such that when the power at the time of failure from the existing equipment and the new equipment flowing through the power transmission line 208 exceeds the usable amount of the power transmission line 208 at the time of failure of the power system, the amount of excess power from the new equipment This is a condition for suppressing power. Here, suppression includes output stop such as disconnection (parallel off) at an interconnection point. Such control can maximize the power flowing through the transmission line 208 during normal operation.

FIG. 10 is a diagram showing another example of the free space calculated by the free space calculating unit 108. In FIG. This example is when the fault power flowing through the transmission line 208 is greater than the available capacity of the transmission line 208 . In this example, the output trend is the sum of the amounts used by the existing power generation equipment and the new power generation equipment. Also, the difference between the maximum value of the power at failure and the usable amount is defined as the excess. The free capacity calculation unit 108 in this example determines the free capacity by subtracting the operating capacity of the existing facility and the excess from the maximum value of the output trend.

FIG. 11 is a diagram showing an example of restraint conditions applied to new equipment. The suppression condition in this example is to reduce the output power of the new equipment so that the sum of the power flowing through the power transmission line 208 (failure power) is equal to or less than the specified fault value when a failure occurs in the power system. It is a condition to suppress. The failure power in this example is the power that flows through the transmission line 208 while the new equipment is connected to the power system. When the suppression condition is attached to a plurality of new facilities, the suppression condition storage unit 112 stores the suppression amount, which is the difference between the maximum value of the power at failure before suppression and the specified value at the time of accident, to the plurality of new facilities. to share. The sharing ratio may be an equal ratio, or may be a ratio preset when the suppression condition is applied.

FIG. 12 is a diagram showing an example of a management device 802 that manages the power system. The management device 802 includes the free space calculation device 100 described with reference to FIG. The management device 802 in this example is a server connectable to the network 804 . Management device 802 can communicate with multiple terminals 806 and multiple power equipment 808 via network 804 . Each terminal 806 is associated with a power facility 808 . Each terminal 806 can communicate with power equipment 808 . Terminal 806 may control the functionality of at least some of power equipment 808 .

When adding a new power facility 808 , the operator of the power facility 808 accesses the management device 802 via the terminal 806 . The terminal 806 includes information for specifying the transmission line 208 to which the new power equipment 808 connects and information regarding the power that the power equipment 808 outputs to the transmission line 208 . The information for specifying the transmission line 208 may be information that directly specifies the transmission line 208 . In another example, the information for identifying power line 208 may be information indicating the location of power equipment 808 . The management device 802 may identify any transmission line 208 that exists near the power equipment 808 based on the location information of the power equipment 808 .

The management device 802 calculates the free capacity of the specified transmission line 208 . The management device 802 determines whether or not the new power equipment can be connected to the power system based on the calculated free capacity and the output power of the new power equipment. The management device 802 notifies the terminal 806 that the connection is permitted when the new power equipment can be connected or when the connection can be made with a restriction condition.

When new power equipment is connected to the power system, the management device 802 notifies the power equipment 808 or the terminal 806 of a command to suppress the output of the power equipment according to the suppression conditions for the power equipment.

With such a configuration, when connecting the power equipment 808 to the power system, it is possible to efficiently and accurately calculate the free space of the transmission line 208 and determine whether the power equipment 808 can be connected. Also, the management device 802 can control the power equipment 808 based on the restraint conditions attached at the time of connection.

FIG. 13 illustrates an example computer 2200 upon which aspects of the invention may be implemented in whole or in part. Programs installed on the computer 2200 may cause the computer 2200 to function as one or more sections of an operation or apparatus associated with an apparatus according to embodiments of the invention, or may Sections can be executed and/or computer 2200 can be caused to perform methods or steps of methods according to embodiments of the invention. Such programs may be executed by CPU 2212 to cause computer 2200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

Computer 2200 according to this embodiment includes CPU 2212 , RAM 2214 , graphics controller 2216 , and display device 2218 , which are interconnected by host controller 2210 . Computer 2200 also includes input/output units such as communication interface 2222, hard disk drive 2224, DVD-ROM drive 2226, and IC card drive, which are connected to host controller 2210 via input/output controller 2220. there is The computer also includes legacy input/output units such as ROM 2230 and keyboard 2242 , which are connected to input/output controller 2220 through input/output chip 2240 .

CPU 2212 operates according to programs stored in ROM 2230 and RAM 2214, thereby controlling each unit. Graphics controller 2216 retrieves image data generated by CPU 2212 into itself, such as a frame buffer provided in RAM 2214 , and causes the image data to be displayed on display device 2218 .

Communication interface 2222 communicates with other electronic devices over a network. Hard disk drive 2224 stores programs and data used by CPU 2212 within computer 2200 . DVD-ROM drive 2226 reads programs or data from DVD-ROM 2201 and provides programs or data to hard disk drive 2224 via RAM 2214 . The IC card drive reads programs and data from IC cards and/or writes programs and data to IC cards.

ROM 2230 stores therein programs that are dependent on the hardware of computer 2200, such as a boot program that is executed by computer 2200 upon activation. Input/output chip 2240 may also connect various input/output units to input/output controller 2220 via parallel ports, serial ports, keyboard ports, mouse ports, and the like.

A program is provided by a computer-readable medium such as a DVD-ROM 2201 or an IC card. The program is read from a computer-readable medium, installed in hard disk drive 2224 , RAM 2214 , or ROM 2230 , which are also examples of computer-readable medium, and executed by CPU 2212 . The information processing described within these programs is read by computer 2200 to provide coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing the manipulation or processing of information in accordance with the use of computer 2200 .

For example, when communication is performed between the computer 2200 and an external device, the CPU 2212 executes a communication program loaded in the RAM 2214 and sends communication processing to the communication interface 2222 based on the processing described in the communication program. you can command. The communication interface 2222 reads transmission data stored in a transmission buffer processing area provided in a recording medium such as the RAM 2214, the hard disk drive 2224, the DVD-ROM 2201, or an IC card under the control of the CPU 2212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written to a receive buffer processing area or the like provided on the recording medium.

In addition, the CPU 2212 causes the RAM 2214 to read all or necessary portions of files or databases stored in external recording media such as a hard disk drive 2224, a DVD-ROM drive 2226 (DVD-ROM 2201), an IC card, etc. Various types of processing may be performed on the data in RAM 2214 . CPU 2212 then writes back the processed data to the external recording medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on recording media and subjected to information processing. CPU 2212 performs various types of operations on data read from RAM 2214, information processing, conditional decision making, conditional branching, unconditional branching, and information retrieval, as specified throughout this disclosure and by instruction sequences of programs. Various types of processing may be performed, including /replace, etc., and the results written back to RAM 2214 . In addition, the CPU 2212 may search for information in a file in a recording medium, a database, or the like. For example, if a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, the CPU 2212 determines that the attribute value of the first attribute is specified. search the plurality of entries for an entry that matches the condition, read the attribute value of the second attribute stored in the entry, and thereby associate it with the first attribute that satisfies the predetermined condition. an attribute value of the second attribute obtained.

The programs or software modules described above may be stored in a computer readable medium on or near computer 2200 . Also, a recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable medium, thereby providing the program to the computer 2200 via the network. do.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is particularly "before", "before etc., and it should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. not a thing

100... available capacity calculation device, 102... capacity information acquisition unit, 104... operation information acquisition unit, 106... failure power calculation unit, 108... available capacity calculation unit, 202... Power generation facility 206 Transformer 208 Transmission line 210 Load facility 110 Connection determination unit 112 Suppression condition storage unit 802 Management device 804. ... network, 806 ... terminal, 808 ... power equipment

Claims (13)

A free capacity calculation device for calculating the free capacity of a transmission line included in a power system,
a capacity information acquisition unit that acquires capacity information indicating a usable amount according to the installed capacity of the target transmission line for which the free capacity is to be calculated;
an operation information acquisition unit that acquires first operation information indicating the operation status of the target transmission line;
a system information storage unit that stores system model information including information on the installed capacity of each transmission line included in the power system;
In the first operation information and the system model information, the power at the time of failure that is assumed to flow in the target transmission line when a non-target transmission line other than the target transmission line among the transmission lines included in the power system fails. a failure power calculation unit that calculates power flow based on
a free space calculation unit that calculates a first free space based on the usable amount and the failure power ,
The available capacity calculation unit is a model for calculating whether or not each facility can stably continue operation when a predetermined state change occurs in the power system. calculating the free capacity, and adopting the minimum free capacity of the second free capacity and the first free capacity as the free capacity of the target transmission line;
Free space calculation device. The power calculation unit at failure,
Active power and reactive power generated by power equipment connected to the power system, voltage and current magnitude, phase, frequency at each node of the power system, power consumed by load equipment connected to the power system, and The power at failure is calculated further based on virtual model information including at least one of a past operation status and a future operation plan of the power equipment connected to the power system.
The available capacity calculation device according to claim 1. The operation information acquisition unit acquires second operation information indicating the operation status of the non-target power transmission line,
The available capacity calculation device according to claim 2, wherein the failure power calculation unit calculates the failure power by the power flow calculation based on the second operation information, the system model information, and the virtual model information . When the operating capacity at failure, which is the maximum value of the electric power at failure, is smaller than the usable capacity, the free capacity calculating unit calculates the difference between the usable capacity and the operating capacity at fault as the first free capacity. 4. The free space calculation device according to any one of claims 1 to 3 . The available capacity calculation unit calculates the available capacity and the power capacity currently used or assumed to be used in the target transmission line when the fault power is smaller than the available capacity. Calculate the difference from the operational capacity as the first free capacity
The available capacity calculation device according to any one of claims 1 to 3. The available capacity calculation unit, when the power at failure is greater than the usable amount, calculates the total amount of power used by the power generation equipment connected to the power system and the new power generation equipment from the maximum value of the output trend. , the operating capacity that is the power capacity that is currently used or expected to be used in the target transmission line, and the excess that is the difference between the operating capacity at failure, which is the maximum value of the power at failure, and the usable amount The first free space is calculated as the amount obtained by subtracting the
The available capacity calculation device according to any one of claims 1 to 3. The failure power calculation unit calculates the failure power that is expected to flow through the target power transmission lines when two or more of the non-target power transmission lines fail.
The available capacity calculation device according to any one of claims 1 to 6. 8. A connection determination unit that determines whether or not connection is possible based on the estimated usage amount of the new equipment and the free capacity of the transmission line when connecting the new equipment to the power system. The available capacity calculation device according to any one of . If the estimated usage of the new equipment is greater than the available capacity, the connection determination unit suppresses the usage of the new equipment at least until the usage of the new equipment is equal to or less than the available capacity. The available capacity calculation device according to claim 8, wherein connection of the new facility to the power system is permitted. The free capacity according to claim 9, wherein the connection determination unit permits connection of the new equipment to the power system on condition that the usage amount of the new equipment is suppressed when a failure occurs in the non-target transmission line. calculator. The connection determining unit selects the use of the new facility when the usage of the transmission line by the power facility connected to the power system increases and the usage of the transmission line by the power facility and the new facility exceeds the usable amount. permitting connection of said new equipment to said power system, provided that it limits the amount of
The available capacity calculation device according to claim 8. A free capacity calculation method for calculating the free capacity of a transmission line included in a power system by a computer,
a capacity information acquisition step of acquiring capacity information indicating a usable amount according to the installed capacity of the target transmission line for which the free capacity is to be calculated;
an operation information acquisition step of acquiring first operation information indicating the operation status of the target transmission line;
a system information storage stage for storing system model information including information on the installed capacity of each transmission line included in the power system;
In the first operation information and the system model information, the power at the time of failure that is assumed to flow through the target transmission line when a non-target transmission line other than the target transmission line among the transmission lines included in the power system fails. A failure power calculation step calculated by power flow calculation based on
a free space calculating step of calculating a first free space based on the usable amount and the failure power ,
In the free capacity calculation step, when a predetermined state change occurs in the power system, the second based on a transient stability model, which is a model for calculating whether each facility can stably continue operation calculating the free capacity, and adopting the minimum free capacity of the second free capacity and the first free capacity as the free capacity of the target transmission line;
Free space calculation method. A program for causing a computer to execute the free space calculation method according to claim 12 .

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