JP6299533B2 - Storage battery installation support device, control method and program for storage battery installation support device - Google Patents

Description

  The present invention relates to a storage battery installation support device, a control method for the storage battery installation support device, and a program.

  The power system is composed of various facilities such as power stations, substations, power transmission lines, distribution lines, and transformers, but accidents may occur due to natural disasters such as lightning and typhoons or contact with birds and beasts. There is. If an accident occurs in the power system, the power supply will be hindered and will have a great impact on consumers.

  For this reason, a technology has been developed for providing a storage battery in an electric power system and suppressing an influence when an accident occurs in the electric power system (for example, see Patent Document 1).

JP 2013-143839 A

  However, in this conventional technology, the storage device information simulation unit repeatedly calculates the appropriate voltage maintenance rate and the distribution loss rate based on the amount of electricity for each time using the storage battery information as a parameter, and the appropriate voltage maintenance rate is high. Cases with a low loss rate are calculated as optimal storage battery locations. That is, the location of the storage battery that increases the distribution efficiency in the steady state of the distribution system is calculated.

  Therefore, although the power distribution efficiency can be kept high in the steady state, there is a possibility that excessive power is transmitted to the transmission line or the distribution line when an accident occurs.

  The present invention has been made in view of such problems, and in the event of a grid fault in the power system, it prevents excessive power from being transmitted to the transmission line or distribution line and stabilizes the power system. One object of the present invention is to provide a storage battery installation support device, a control method for the storage battery installation support device, and a program capable of obtaining an effective storage battery placement location.

  One of the means for solving the above problem is to execute a first tidal current calculation for performing a first tidal current calculation assuming a situation in which no accident has occurred in the power system, using system information representing the configuration of the power system. The storage battery is installed at each position that is a candidate in the power system using a storage battery information acquisition unit that acquires information on the storage battery installed in the power system, the information on the storage battery, and the system information. A second tidal current calculation execution unit that performs a second tidal current calculation assuming a situation in which an accident has occurred in the power system, and a result of the first tidal current calculation and a result of the second tidal current calculation, before and after the accident. An installation plan selection for obtaining an evaluation value indicating a degree of change in voltage phase difference between adjacent nodes in the electric power system, and determining an installation position of the storage battery and charge / discharge power for each accident based on the evaluation value It comprises a part, a.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description in the column of the embodiment for carrying out the invention and the description of the drawings.

  According to the present invention, when a grid fault occurs in the power system, it is possible to prevent the power from being excessively transmitted to the transmission line or the distribution line, and to effectively place the storage battery in order to stabilize the power system. In addition, it is possible to obtain charge / discharge power for each accident.

It is a figure which shows the function structure of a storage battery installation assistance apparatus. It is a figure which shows the hardware constitutions of a storage battery installation assistance apparatus. It is a figure which shows electric power grid | system data. It is a figure which shows a simulation parameter table. It is a figure which shows a storage battery setting table. It is a figure which shows a simulation parameter table. It is a figure which shows a storage battery setting table. It is a figure which shows a node information table. It is a figure which shows a generator information table. It is a figure which shows a branch information table. It is a figure which shows a normal time phase difference table. It is a figure which shows the phase difference table at the time of accident occurrence. It is a figure which shows the phase of the voltage in the electric power system before and behind the occurrence of an accident. It is a figure which shows an evaluation value list table. It is a flowchart which shows the flow of a process of a storage battery installation assistance apparatus. It is a figure which shows the output result of a storage battery installation assistance apparatus. It is a figure which shows an electric power grid | system. It is a figure which shows an electric power grid | system. It is a figure which shows a mode that the accident generate | occur | produced in the electric power grid | system. It is a figure which shows a mode that the accident generate | occur | produced in the electric power grid | system. It is a figure which shows the function structure of a storage battery installation assistance apparatus. It is a flowchart which shows the flow of a process of a storage battery installation assistance apparatus. It is a figure which shows a mode that the position which arrange | positions a storage battery is searched. It is a figure which shows a simulation log | history table. It is a figure which shows the optimal solution preservation | save table.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

  The storage battery installation support apparatus 100 according to the embodiment of the present invention is an apparatus that supports an installation plan formulation work when installing a storage battery in an electric power system.

== First Embodiment ==
The whole structure of the storage battery installation assistance apparatus 100 which concerns on 1st Embodiment is shown in FIG.1 and FIG.2. FIG. 1 is a diagram for explaining a functional configuration of the storage battery installation support apparatus 100, and FIG. 2 is a diagram for explaining a hardware configuration of the storage battery installation support apparatus 100.

  As shown in FIG. 2, the storage battery installation support apparatus 100 according to the present embodiment includes a CPU (Central Processing Unit) 110, a memory 120, a communication apparatus 130, a storage apparatus 140, an input apparatus 150, an output apparatus 160, and a recording medium reading apparatus. The computer is configured to include 170.

  The CPU 110 is responsible for overall control of the storage battery installation support apparatus 100, and reads out and executes the control program 600 composed of codes for performing various operations according to the present embodiment stored in the storage device 140 to the memory 120. By doing so, various functions as the storage battery installation support device 100 are realized.

  For example, although details will be described later, the control program 600 is executed by the CPU 110 and cooperates with hardware devices such as the memory 120, the communication device 130, and the storage device 140, so that the power system data storage unit 142 and the first power flow calculation are performed. An execution unit 180, a second power flow calculation execution unit 181, a storage battery information acquisition unit 182, an installation plan selection unit 183, an output unit 184, and the like are realized.

  The memory 120 can be configured by a semiconductor memory device, for example.

  The communication device 130 is a network interface such as a network card. The communication device 130 receives data from another computer via a network such as the Internet or a LAN (Local Area Network), and stores the received data in the storage device 140 or the memory 120. Further, the communication device 130 transmits data stored in the storage device 140 or the memory 120 to another computer via the network.

  The input device 150 is a device such as a keyboard, a mouse, or a microphone, and is a device for accepting input of information by an operator of the storage battery installation support device 100. The output device 160 is a device such as an LCD (Liquid Crystal Display), a printer, or a speaker, and is a device for outputting information.

  The storage device 140 can be constituted by, for example, a hard disk device or a semiconductor storage device. The storage device 140 is a device that provides a physical storage area for storing various programs, data, tables, and the like.

  The control program 600 is stored in the storage battery installation support apparatus 100 by reading it from the recording medium (various optical disks, magnetic disks, semiconductor memory, etc.) 800 to the storage device 140 using the recording medium reader 170. It can also be stored in the storage battery installation support device 100 by obtaining from another computer that is communicably connected via the communication device 130.

  Hereinafter, an embodiment in which only active power is charged / discharged mainly from the storage battery will be described. The embodiment in the case where reactive power is also supplied from the storage battery will be described while adding changes as necessary.

  Next, as shown in FIG. 1, the storage battery installation support apparatus 100 according to the present embodiment includes a data reading unit 101, a simulation command unit 102, a storage battery setting unit 103, a grid fault setting unit 104, a power flow calculation unit 105, a voltage Functional blocks of the phase difference calculation unit 106, the evaluation value calculation unit 107, the optimal arrangement and charge / discharge power calculation unit 108, the parameter storage unit 141, the power system data storage unit 142, the voltage phase difference storage unit 143, and the evaluation value storage unit 144 It is configured with.

  Among these, the power flow calculation unit 105 and the voltage phase difference calculation unit 106 function to realize the first power flow calculation execution unit 180 and the second power flow calculation execution unit 181 described above. Further, the evaluation value calculation unit 107 and the optimum arrangement / charge / discharge power calculation unit 108 function to realize the installation plan selection unit 183. Further, the data reading unit 101 functions to realize the storage battery information acquisition unit 182. The output device 160 functions to realize the output unit 184.

  The data reading unit 101 stores input parameters input from the input device 150 such as a keyboard and a mouse in the parameter storage unit 141. As will be described later, the parameter storage unit 141 includes a simulation parameter table 141A and a storage battery setting table 141B.

  The input parameters include information on storage batteries such as the number of storage batteries arranged in the power system and maximum charge / discharge power, simulation classification, and accident section (information indicating the location where the accident occurred). Information for designating the contents of the simulation to be performed is included.

  A state in which these input parameters are stored in the parameter storage unit 141 is shown in FIGS.

  4 and 5 are examples of input parameters when a power system simulation is performed by the method specified by Category 3 when one storage battery having a maximum charge / discharge active power of 400 MW (megawatts) is installed in the power system. FIG. When reactive power is also supplied from the storage battery, the maximum reactive power and the maximum apparent power are set in addition to this.

  The operator of the storage battery installation support apparatus 100 can select any one of the categories 1 to 4 as the simulation category.

  When simulation category 1 is selected, the storage battery installation support apparatus 100 performs a simulation when an accident occurs at a specific position in the power system (the position of the accident is specified by an input parameter, and a simulation parameter table The storage location of the storage battery and the charge / discharge power that can minimize the influence of the accident as a whole power system are output.

  Thus, since the storage battery installation support apparatus 100 according to the present embodiment can specify the position of an accident, for example, when a place where an accident is likely to occur is specified from past results, the storage battery is installed. More accurate countermeasure effects can be obtained.

  In addition, it is possible to take measures to suppress the damage caused by the accident as a whole by identifying the storage battery installation location and charge / discharge power that minimize the influence of the accident on the entire power system.

  When the simulation category 2 is selected, the storage battery installation support device 100 performs a simulation when an accident occurs at a specific position in the power system (similar to the case of the category 1, the location of the accident is an input parameter). Output the storage battery location and charge / discharge power that can minimize the greatest impact of accidents occurring in the power system.

  Thus, since the storage battery installation support apparatus 100 according to the present embodiment can specify the position of an accident, for example, when a place where an accident is likely to occur is specified from past results, the storage battery is installed. More accurate countermeasure effects can be obtained.

  In addition, the storage battery location and charge / discharge power that minimize the maximum impact of an accident that occurs in the power system can be specified, so that it is possible to take measures that can suppress the maximum damage caused by the accident.

  When the simulation category 3 is selected, the storage battery installation support device 100 performs simulations when accidents occur at various positions in the power system, and no matter where the accident occurs in the power system, In addition, the storage battery installation location and the charge / discharge power for each accident that can minimize the influence of the accident as an entire power system are output. When the simulation category 3 is designated, information for specifying the location of the accident may not be included in the input parameters.

  In this way, by simulating the occurrence of an accident at various positions in the power system without specifying the position of the accident, for example, to obtain a countermeasure effect when a storage battery is installed from a long-term viewpoint Can do. For example, it is possible to obtain an installation effect of a storage battery in a case where all the effects of an accident that may occur during 10 years are considered cumulatively.

  When the simulation category 4 is selected, the storage battery installation support device 100 performs simulations when accidents occur at various positions in the power system, and no matter where the accident occurs in the power system, The storage battery installation location and the charge / discharge power for each accident that can minimize the greatest impact of the accident occurring in the power system are output. Even when the simulation classification 4 is designated, the information for specifying the position of the accident may not be included in the input parameters.

  In this way, the installation of a storage battery that simulates the occurrence of an accident at various locations in the power system without specifying the location of the accident and minimizes the maximum impact of the accident that occurs in the power system Since the charge / discharge power for each location and accident can be specified, for example, from a long-term viewpoint, it is possible to take measures that can suppress the maximum damage caused by the accident. For example, it is possible to obtain an installation effect of the storage battery in a case where all the places that are most affected by an accident that can occur in 10 years are considered cumulatively.

  In the example shown in FIG. 4, since the simulation division = 3 is designated, the accident section is not designated.

  6 and 7 show that an accident occurred at a point on the power system specified by “11-21” when three storage batteries with maximum charge / discharge active power of 400 MW, 350 MW, and 300 MW were placed in the power system. It is a figure which shows the example of the input parameter in the case of performing the simulation of the electric power system in the case by the method specified by the division 2.

  Hereinafter, an embodiment in which the simulation classification is set to 1 will be mainly described. An embodiment in which the simulation classification is 2, 3, or 4 will be described while adding changes as necessary.

  Returning to FIG. 1, the data reading unit 101 reads the power system data 300 and stores it in the power system data storage unit 142. The power system data 300 is system information representing the configuration of the power system, and includes a generator and its generated power, each connection point (hereinafter also referred to as a node), a transformer, a load and its power consumption, their connection relationship and their connection. This is a data conversion of electrical characteristics (impedance, etc.) of wires (transmission lines, distribution lines, etc.). An example of a system diagram of the power system data 300 is shown in FIG.

  The power system data storage unit 142 that stores the power system data 300 includes a node information table 142A, a generator information table 142B, and a branch information table 142C, as shown in FIGS.

  As shown in FIGS. 8 to 10, the power system data 300 includes data (node information) representing each node (connection point) of the power system and the state of power in each node, and a generator provided in the power system. Related data (generator information), and data (branch information) representing electrical characteristics in a branch constituted by facilities such as electric lines and transformers connecting adjacent nodes in the power system.

<Node information table>
The node information is stored in the node information table 142A as shown in FIG. The node information table 142A has a “node No.” column, an “active power” column, a “reactive power” column, and a “voltage” column.

  In the “Node No” column, identification information (also referred to as a node number) of each node in the power system is described.

  In the “active power” column, the value of active power generated or consumed at the position of each node is described. For this reason, when no load is installed at the node position, no power is consumed or generated at the node, so the value in the “effective power” column is zero. When a storage battery is installed at the node position, the value of active power discharged or charged from the storage battery is described. In the present embodiment, it is assumed that the value of active power when discharged from the storage battery is negative, and the value of active power when charged is positive.

  In the “reactive power” column, the value of reactive power at the position of each node is described. For this reason, when no load is installed at the node position, no reactive power is generated at the node, and the value in the “reactive power” column is zero. When the storage battery also supplies reactive power, if the storage battery is installed at the node position, the value of reactive power supplied from the storage battery (minus when supplying delayed reactive power to the grid, advance invalid Plus when supplying power).

  In the “Voltage” column, the initial value of the voltage at the position of each node is described.

<Generator information table>
The generator information is stored in the generator information table 142B as shown in FIG. The generator information table 142B includes a “generator No” column, a “connection node” column, an “active power” column, a “reactive power” column, a “voltage” column, and a “rated capacity” column.

  In the “Generator No.” column, identification information of each generator is described.

  In the “connection node” column, information (node number) indicating a position where each generator is installed is described.

  In the “active power” column, an initial value of active power generated by each generator is described.

  In the “reactive power” column, an initial value of reactive power generated by each generator is described.

  In the “voltage” column, the value of the voltage at the installation location of each generator is described.

  In the “rated capacity” column, the rated value of power that can be generated by each generator is described.

<Branch information table>
The branch information is stored in the branch information table 142C as shown in FIG. The branch information table 142C includes a “branch No” column, a “node No” column, a “node No” column, an “r” column, an “x” column, a “b” column, and a “transformation ratio” column.

  In the “Branch No” column, identification information (also referred to as a branch number) of each branch is described. A branch is a section sandwiched between two adjacent nodes on the power system. The branch is composed of facilities such as a transmission line, a distribution line, and a transformer.

  In the “Node No” column, node numbers at both ends of the branch are described.

  In the “r” column, the resistance value in each branch is described.

  In the “x” column, the reactance value in each branch is described.

  In the “b” column, the susceptance value in each branch is described.

  In the “transformation ratio” column, a ratio of voltages at nodes at both ends of each branch is described. When no transformer is installed in the branch, “0” is described.

  Returning to FIG. 1, the simulation command unit 102 supervises the entire processing of the simulation, and based on the information described in the power system data storage unit 142 and the parameter storage unit 141, the storage battery setting unit 103, system fault setting The unit 104, the power flow calculation unit 105, the voltage phase difference calculation unit 106, and the evaluation value calculation unit 107 perform various commands and control when performing a power system simulation.

  For example, the simulation command unit 102 determines the number of storage batteries, charge / discharge power, the occurrence location of a system fault, and the number of times of simulation execution, and commands the simulation.

  The storage battery setting unit 103 acquires, from the simulation command unit 102, information related to the position (node number) and charge / discharge power of the storage battery installed in the power system, and the corresponding node number in the node information table 142A of the power system data storage unit 142. In the row, the active power column is rewritten to simulate the state where the storage battery is installed at the node. When reactive power is supplied from the storage battery, the reactive power column is also rewritten.

  The grid fault setting unit 104 acquires information on the position (branch number) of the fault occurring in the power system from the simulation command unit 102, and in the corresponding branch number row of the branch information table 142C of the power system data storage unit 142. , R, x, and b are rewritten so that a system fault has occurred in that branch.

  Based on a command from the simulation command unit 102, the power flow calculation unit 105 stores power system data such as power generated by the generator, power consumption of the load, node connection relation, various electrical characteristics such as impedance between nodes, and the like. Power system power flow calculation (first power flow calculation, second power flow calculation) is performed using the system information recorded in the unit 142, and the power flow, voltage of each node, voltage phase, and the like are calculated. Various algorithms for performing the tidal current calculation are known, and the storage battery installation support device 100 according to the present embodiment may use those known algorithms. Of course, a new algorithm may be used.

  The power flow calculation unit 105 calculates a power flow (first power flow calculation) assuming that no accident has occurred in the power system, and performs a power flow calculation (second power flow calculation) assuming a situation where an accident has occurred in the power system. )I do.

  FIG. 13 shows the result of calculating the voltage phase at each node by the power flow calculation unit 105 performing the power flow calculation. In FIG. 13, the numbers in [] indicate the phase of the voltage at each node when an accident has not occurred in the power system, and the numbers in () indicate the numbers at each node when an accident has occurred in the power system. Indicates the phase of the voltage. The phase of the voltage at each node is indicated by a difference from a reference node (node 3 in this embodiment) defined as a phase reference.

  Note that the example shown in FIG. 13 shows a case where an accident (one line disconnection accident) occurs in the branch between the node 21 and the node 23.

  Based on the command from the simulation command unit 102, the voltage phase difference calculation unit 106 performs each node obtained by the first power flow calculation performed by the power flow calculation unit 105 assuming that no accident has occurred in the power system. The voltage phase difference between adjacent nodes is obtained from the voltage phase at, and stored in the voltage phase difference storage unit 143. Similarly, the voltage phase difference calculation unit 106 obtains the voltage phase difference between adjacent nodes from the voltage phase at each node obtained by the second power flow calculation assuming that an accident has occurred in the power system, and determines the voltage level. Stored in the phase difference storage unit 143.

  FIG. 11 and FIG. 12 show how the voltage phase difference calculation unit 106 calculates the voltage phase difference before and after the occurrence of a system fault between adjacent nodes and stores it in the voltage phase difference storage unit 143.

  The voltage phase difference storage unit 143 includes a normal phase difference table 143A and an accident occurrence phase difference table 143B.

  The normal phase difference table 143A stores a phase difference between adjacent nodes obtained by the voltage phase difference calculation unit 106 performing the first power flow calculation assuming that no accident has occurred in the power system. It is.

  The accident phase difference table 143B is a table that stores a phase difference between adjacent nodes obtained by the voltage phase difference calculation unit 106 performing the second power flow calculation assuming that an accident has occurred in the power system. is there.

  As shown in FIG. 11, the normal phase difference table 143A has a “section (a, b)” column, a “phase (node a)” column, a “phase (node b)” column, and a “phase difference” column. .

  In the “section (a, b)” column, information for specifying a pair of two adjacent nodes (node a, node b) in the power system is described. The information specifying this pair can be made to correspond to the branch number by collating with the two node No columns described in the branch information table 142C.

  The “phase (node a)” column describes the phase of the voltage at one of the two adjacent nodes.

  The “phase (node b)” column describes the phase of the voltage at the other node.

  The “phase difference” column describes the phase difference between both nodes.

  Further, as shown in FIG. 12, the phase difference table 143B at the time of the occurrence of an accident includes the “section (a, b)” column, the “phase (node a)” column, the “phase (node b)” column, and the “phase difference” column. In addition, a “storage battery placement node” field, a “storage battery charge / discharge effective power” field, and an “accident section” field are provided.

  In the “storage battery placement node” column, information (node number) indicating the position of the storage battery installed in the power system is described.

  In the “storage battery charging / discharging active power” column, information indicating effective power for charging or discharging the storage battery when an accident occurs in the power system is described.

  In the “accident section” column, information (branch identification information) indicating the position of an accident occurring in the power system is described.

  When reactive power is also supplied from the storage battery, a “storage battery reactive power” column is added, and information indicating forward reactive power or delayed reactive power supplied by the storage battery when an accident occurs in the power system is described.

  Returning to FIG. 1, the evaluation value calculation unit 107 is based on data stored in the voltage phase difference storage unit 143 (phase difference between adjacent nodes before and after the occurrence of the accident) based on a command from the simulation command unit 102. The evaluation value is calculated using an evaluation formula selected according to the simulation classification described in the simulation parameter table 141A.

  The evaluation formula calculates an evaluation value indicating the degree of change in phase difference between adjacent nodes before and after the accident. For example, in the present embodiment, the smaller the evaluation value, the smaller the change in phase difference between adjacent nodes before and after the occurrence of the accident, that is, the smaller the influence of the accident. The evaluation formula and the evaluation value will be described later.

  The evaluation value calculation unit 107 stores the calculated evaluation value in the evaluation value list table 144A of the evaluation value storage unit 144. FIG. 14 shows how evaluation values are recorded in the evaluation value list table 144A. In the example illustrated in FIG. 14, the calculated evaluation values are sorted in ascending order, and it is indicated that the evaluation value in the case where a storage battery that discharges active power at 400 MW at the time of an accident is installed at the node 24 is the smallest.

  When the simulation classification is 2, the column of “sum of phase difference difference” is changed to “maximum value of phase difference difference” based on the setting of an evaluation formula and an evaluation value described later.

  When the simulation classification is 3, the value of charge / discharge active power for each accident is recorded in the “storage battery charge / discharge active power” column.

  When the simulation category is 4, the value of charge / discharge active power for each accident is recorded in the “Storage battery charge / discharge active power” column, and the “sum of phase difference difference” is set based on the evaluation formula and evaluation value setting described later. The “column” is changed to “maximum difference in phase difference”.

  In any simulation category, when reactive power is also supplied from the storage battery, the value of the reactive power supplied in addition to the above is also recorded.

  Next, referring back to FIG. 1, the optimal arrangement and charge / discharge power calculation unit 108 among the evaluation values calculated by the evaluation value calculation unit 107, the storage battery arrangement location and the charge / discharge power (simulation) that minimize the evaluation value. When the classification is 3 or 4, the charge / discharge power for each accident) is selected from the evaluation value list table 144A.

  Then, the optimum arrangement and charge / discharge power calculation unit 108 outputs information indicating the selected storage battery arrangement location and charge / discharge power to the output device 160. FIG. 16 shows a state in which information indicating the selected storage battery arrangement location and charge / discharge power is output to the output device 160. In the example shown in FIG. 16, a state in which a storage battery that charges and discharges 400 MW of active power at the time of an accident is installed in the node 24 in the power system is shown as an image image.

  In addition, when it is set as the simulation classification 3 or 4, the charging / discharging active power for every accident is output with a mode that the storage battery is installed in the node 24.

  In any simulation category, when reactive power is also supplied from the storage battery, the value of the reactive power supplied in addition to the above is also output.

  As described above, the storage battery installation support apparatus 100 according to the present embodiment simulates a grid fault from the model data of the power grid (power grid data 300), and calculates the voltage phase difference between adjacent nodes before and after the grid fault. The difference is obtained, and based on the difference, the storage battery location and charge / discharge power are obtained so that the change in phase difference between adjacent nodes before and after the occurrence of the accident is as small as possible. As a result, in the event of a grid fault in the power system, the optimal storage battery location and optimal charge / discharge power on the power system can be prevented so that excessive power is not transmitted to the transmission line or distribution line. Can be calculated.

<Process flow>
Next, the flow of processing performed by the storage battery installation support device 100 according to the present embodiment when determining the optimal installation location of the storage battery in the power system will be described with reference to the flowchart shown in FIG.

  In the following, an embodiment in which the storage battery charges and discharges only active power when the simulation classification is set to 3 will be described. In the case where the simulation classification is 1, 2, or 4, and the case where the storage battery outputs reactive power, an explanation will be given while adding changes as necessary.

  In the parameter storage unit 141 and the power system data storage unit 142, various types of information such as the above-described system information and input parameters are already set.

  For example, it is assumed that the contents shown in FIGS. 4 and 5 are set in the parameter storage unit 141, and the contents shown in FIGS. 8 to 10 are set in the power system data storage unit 142.

  First, the storage battery installation support device 100 performs a power flow calculation (first power flow calculation) assuming that no accident has occurred in the power system, and obtains a voltage phase difference between adjacent nodes in the power system (S1000, S1010). ).

  Specifically, the simulation command unit 102 causes the power flow calculation unit 105 to perform power flow calculation (first power flow calculation) using the grid information recorded in the power grid data storage unit 142. Then, the power flow calculation unit 105 calculates the power flow, the voltage of each node, the voltage phase, etc. when no accident has occurred in the power system (S1000).

  Next, the simulation command unit 102 instructs the voltage phase difference calculation unit 106 from the voltage phase at each node obtained by the first power flow calculation performed by the power flow calculation unit 105 before the occurrence of a system fault between adjacent nodes. Is calculated and stored in the normal phase difference table 143A (S1010).

  Next, the simulation command unit 102 acquires the number of storage batteries = 1 from the simulation parameter table 141A, and acquires the number of nodes in the power system = 47 (corresponding to the number of storage battery placement candidate positions) from the node information table 142A. (S1020).

  The simulation command unit 102 secures a one-dimensional array (an array used in a programming language such as C language) corresponding to the number (1) of storage batteries to be arranged in the power system in the memory 120 and the number of arrangement candidate positions. (47) is set as the loop count (S1020, S1120).

  Thereby, the storage battery installation support apparatus 100 performs a power flow calculation (second power flow calculation) for each case where a storage battery is installed in each of 47 nodes that are storage battery placement candidate positions in the power system.

  Next, the simulation command unit 102 acquires the number of storage batteries = 1 from the simulation parameter table 141A, and acquires 400 [MW] as the maximum charge / discharge active power of the storage battery from the storage battery setting table 141B (S1030).

  The simulation command unit 102 secures a one-dimensional array corresponding to the number (1) of storage batteries to be arranged in the power system in the memory 120, and based on the maximum charge / discharge active power (400 MW) of the storage battery, −400 ( As an example, 801 times is set as the number of loops in increments of 1 MW from (charges 400 MW) to +400 (discharges 400 MW) (S1030, S1110).

  As a result, the storage battery installation support device 100 is able to handle each case in 1 MW increments, from the case where the storage battery charges 400 MW of active power when an accident occurs in the power system to the case of discharge of 400 MW of active power when the accident occurs. The tidal current calculation (second tidal current calculation) is performed.

  When reactive power is also supplied from the storage battery, in S1030, the maximum reactive power and the maximum apparent power are acquired from the storage battery setting table 141B together with the maximum charge / discharge active power. Next, in S1030 and S1110, a two-dimensional array corresponding to the number of storage batteries arranged in the electric power system is secured in the memory 120, and a loop for reactive power is formed inside the loop for active power of the storage battery. When the formula (a) is not violated, the tidal current calculation (second tidal current calculation) is performed.

ただし、x^aは蓄電池の充放電有効電力、x^rは蓄電池の無効電力、Aは最大皮相電力である。

However, x ^a is the charge-discharge effective power, x ^r of the battery is reactive power of the storage battery, A is the maximum apparent power.

  Next, the simulation command unit 102 acquires simulation classification = 3 from the simulation parameter table 141A, and acquires the number of branches = 61 (corresponding to the number of accident locations) from the branch information table 142C (S1040).

  Then, the simulation command unit 102 sets the number of accident locations (61) in the power system as the number of loops (S1040, S1100).

  Thereby, the storage battery installation support device 100 performs the second power flow calculation for each case where an accident has occurred at each of 61 locations that may be locations where the accident occurred in the power system.

  When the simulation classification is set to 1 or 2, in S1040, the accident section is acquired from the simulation parameter table 141A, and setting is performed so that the second power flow calculation is performed only in the acquired accident section.

  Next, the simulation command unit 102 notifies the storage battery setting unit 103 of information on the position (node number) of the storage battery installed in the power system and the charge / discharge power. Then, the storage battery setting unit 103 operates the active power column (if the reactive power is also supplied from the storage battery) in the row of the corresponding node number in the node information table 142A of the power system data storage unit 142, The state where the storage battery is installed in the node is represented (S1050). In this way, the charging / discharging power of the storage battery is set to the active power of the node information table 142A (also to the reactive power when reactive power is also supplied from the storage battery).

  For example, when the initial loop is executed, the storage battery setting unit 103 sets -400 in the active power column in the corresponding node number row of the node information table 142A, and sets the storage battery to charge 400 MW. Thereafter, the storage battery setting unit 103 changes the value in the column of active power for each repetition of charge / discharge active power.

  Next, the simulation command unit 102 notifies the grid fault setting unit 104 of information related to the position (branch number) of the fault occurring in the power system. Then, the system fault setting unit 104 operates the values of the r, x, and b fields in the corresponding branch number row of the branch information table 142C of the power system data storage unit 142, and a system fault occurs in that branch. The state is displayed (S1060). In this way, the values in the r, x, and b fields of the branch information table 142C are changed so as to simulate the state when the accident occurred.

  For example, the system fault setting unit 104 doubles the values of r and x and changes the value of b to 0.5 times, thereby causing an accident in which one of the two transmission / distribution lines constituting the branch breaks. Can be simulated.

  Next, the simulation command unit 102 causes the power flow calculation unit 105 to perform power flow calculation (second power flow calculation) using the grid information recorded in the power grid data storage unit 142. Then, the power flow calculation unit 105 reads the data in the power system data storage unit 142 in which the settings relating to the storage battery and the settings related to the grid fault are reflected, and the power flow and the voltage and voltage phase of each node when the fault occurs in the power grid. Etc. are calculated (S1070).

  Next, the simulation command unit 102 provides each of the voltage phase difference calculation unit 106 obtained by power flow calculation (second power flow calculation) assuming a situation where an accident has occurred in the power system performed by the power flow calculation unit 105. The voltage phase difference after the occurrence of a system fault between adjacent nodes is calculated from the voltage phase at the node. Then, the voltage phase difference calculation unit 106 stores the calculated phase difference in the accident occurrence phase difference table 143B (S1080).

  Next, based on the data stored in the voltage phase difference storage unit 143 (phase difference between adjacent nodes before and after the occurrence of the accident), the simulation command unit 102 stores the simulation value table 141A in the simulation parameter table 141A. An evaluation value is calculated using an evaluation formula selected according to the described simulation category (S1090).

  The evaluation value calculation unit 107 calculates the difference between the phase difference between adjacent nodes recorded in the normal phase difference table 143A and the phase difference between adjacent nodes recorded in the accident occurrence phase difference table 143B. (That is, the difference in phase difference) is obtained for each adjacent node. And as an example, the evaluation value calculation part 107 totals the difference of the phase difference between each adjacent node in an electric power system according to storage battery arrangement position, and the charging / discharging electric power of a storage battery, respectively, and those total values are evaluation value lists. The evaluation value is recorded in the table 144A.

  Then, the optimum arrangement and charge / discharge power calculation unit 108 extracts the arrangement position of the storage battery and the charge / discharge power with the smallest evaluation value from the evaluation value list table 144A (S1130). Then, the optimum arrangement and charge / discharge power calculation unit 108 outputs the optimum arrangement position and optimum charge / discharge power of the storage battery to the output device 160.

  Next, an evaluation formula used when the evaluation value calculation unit 107 calculates an evaluation value will be described.

  As described above, the storage battery installation support device 100 calculates the evaluation value using the evaluation formula designated by the simulation classification.

<When simulation category = 1>
When simulation classification = 1 is designated, the evaluation value calculation unit 107 calculates the voltage phase difference between the adjacent nodes obtained by the first power flow calculation and the voltage level between the adjacent nodes obtained by the second power flow calculation. The sum obtained by adding the difference between the phase difference in the electric power system is used as an evaluation value, and this evaluation value is obtained for each installation candidate position of the storage battery and for each charge / discharge power of the storage battery and stored in the evaluation value storage unit 144.

  More specifically, when only active power is charged / discharged from the storage battery, the evaluation value calculation unit 107 refers to the voltage phase difference storage unit 143 and uses the equation (1) as an evaluation equation to obtain the evaluation value. Calculate and store in the evaluation value storage unit 144.

  Then, the optimal arrangement and charge / discharge power calculation unit 108 obtains the installation position and charge / discharge power of the storage battery such that the sum (evaluation value) is minimized. The manner in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by Expression (2).

ただし、各変数の定義は下記の式（３）〜（９）により定められる。

However, the definition of each variable is determined by the following equations (3) to (9).

本実施形態に係る蓄電池設置支援装置１００は、このように蓄電池の設置位置及び充放電電力を求めることにより、特定の位置で事故が発生した場合に、電力系統全体として事故の影響を最小化することができるような蓄電池の設置場所及び充放電電力を求めることができる。

The storage battery installation support apparatus 100 according to the present embodiment minimizes the influence of the accident as a whole power system when an accident occurs at a specific position by determining the installation position and charge / discharge power of the storage battery in this way. The storage battery installation location and charge / discharge power can be obtained.

  When reactive power is also supplied from the storage battery, the state in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by equations (10) and (11).

ただし、各変数の定義は式（４）〜（８）、（１２）、（１３）により定められる。

However, the definition of each variable is determined by the equations (4) to (8), (12), and (13).

＜シミュレーション区分＝２の場合＞
シミュレーション区分＝２が指定された場合、評価値計算部１０７は、第１潮流計算により求めた各隣接ノード間の電圧の位相差と、第２潮流計算により求めた各隣接ノード間の電圧の位相差と、の差分の最大値を評価値とし、この評価値を、蓄電池の設置候補位置別、及び蓄電池の充放電電力別にそれぞれ求めて評価値記憶部１４４に格納する。

<When simulation category = 2>
When simulation classification = 2 is designated, the evaluation value calculation unit 107 calculates the voltage phase difference between the adjacent nodes obtained by the first power flow calculation and the voltage level between the adjacent nodes obtained by the second power flow calculation. The maximum value of the difference between the phase difference is used as an evaluation value, and this evaluation value is obtained for each installation candidate position of the storage battery and for each charge / discharge power of the storage battery and stored in the evaluation value storage unit 144.

  More specifically, when only active power is charged / discharged from the storage battery, the evaluation value calculation unit 107 refers to the voltage phase difference storage unit 143 and uses the equation (14) as an evaluation equation to obtain the evaluation value. Calculate and store in the evaluation value storage unit 144. The definition of each variable is determined by equations (3) to (9).

  Then, the optimum arrangement and charge / discharge power calculation unit 108 obtains the installation position and charge / discharge power of the storage battery such that the maximum value (evaluation value) is minimized. The manner in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by Expression (15).

本実施形態に係る蓄電池設置支援装置１００は、このように蓄電池の設置位置及び充放電電力を求めることにより、特定の位置で事故が発生した場合に電力系統内で生じる事故の最も大きな影響を最小化することができるような蓄電池の設置場所及び充放電電力を求めることができる。

The storage battery installation support apparatus 100 according to the present embodiment minimizes the largest influence of an accident that occurs in the power system when an accident occurs at a specific position by obtaining the installation position and charge / discharge power of the storage battery in this way. The installation location of the storage battery and the charge / discharge power can be obtained.

  When reactive power is also supplied from the storage battery, the state in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by equations (16) and (17).

ただし、各変数の定義は式（４）〜（８）、（１２）、（１３）により定められる。

However, the definition of each variable is determined by the equations (4) to (8), (12), and (13).

<When simulation category = 3>
When simulation classification = 3 is designated, the evaluation value calculation unit 107 calculates the voltage phase difference between the adjacent nodes calculated by the first power flow calculation and the voltage level between the adjacent nodes calculated by the second power flow calculation. The sum of the phase difference and the difference in the power system is obtained for each storage battery installation candidate position, for each charge / discharge power of the storage battery, and for each accident location, and charge the storage battery so that the sum is the minimum value. The discharge power is obtained for each storage battery installation candidate position and each accident occurrence location.

  Then, the evaluation value calculation unit 107 uses the total value obtained by adding the minimum values for each installation position of the storage battery (that is, the total value obtained by adding the minimum values at each accident occurrence position for each installation candidate position) as an evaluation value, This evaluation value (total value) is stored in the evaluation value storage unit 144.

  More specifically, when only active power is charged / discharged from the storage battery, the evaluation value calculation unit 107 refers to the voltage phase difference storage unit 143 and uses the equation (18) as an evaluation equation to obtain the evaluation value. Calculate and store in the evaluation value storage unit 144. The definition of each variable is determined by equations (3) to (9).

  The optimal arrangement and charge / discharge power calculation unit 108 obtains the storage battery installation position and charge / discharge power for each accident so that the total value (evaluation value) is minimized. The manner in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by Expression (19).

本実施形態に係る蓄電池設置支援装置１００は、このように蓄電池の設置位置及び充放電電力を求めることにより、電力系統内の様々な場所で事故が発生した場合の電力系統全体として事故の影響を最小化することができるような蓄電池の設置場所及び事故ごとの充放電電力を求めることができる。

The storage battery installation support apparatus 100 according to the present embodiment determines the storage battery installation position and charge / discharge power in this way, thereby affecting the influence of the accident as a whole power system when an accident occurs in various places in the power system. The storage battery installation location and charge / discharge power for each accident that can be minimized can be obtained.

  When reactive power is also supplied from the storage battery, the state in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by equations (20) and (21).

ただし、各変数の定義は式（４）〜（８）、（１２）、（１３）により定められる。

However, the definition of each variable is determined by the equations (4) to (8), (12), and (13).

<When simulation category = 4>
When simulation classification = 4 is specified, the evaluation value calculation unit 107 calculates the voltage phase difference between the adjacent nodes obtained by the first power flow calculation and the voltage level between the adjacent nodes obtained by the second power flow calculation. The maximum value of the difference between the phase difference and the storage battery candidate position, the storage battery charge / discharge power, and the location where the accident occurred are obtained, and the storage battery charge / discharge power that minimizes the maximum value is determined. It is calculated according to the installation candidate position and the location where the accident occurred.

  Then, the evaluation value calculation unit 107 uses the total value obtained by adding the minimum values for each installation position of the storage battery (that is, the total value obtained by adding the minimum values at each accident occurrence position for each installation candidate position) as an evaluation value, This evaluation value (total value) is stored in the evaluation value storage unit 144.

  More specifically, when only active power is charged / discharged from the storage battery, the evaluation value calculation unit 107 refers to the voltage phase difference storage unit 143 and uses the equation (22) as an evaluation equation to calculate the evaluation value. Calculate and store in the evaluation value storage unit 144. The definition of each variable is determined by equations (3) to (9).

  Then, the optimal arrangement and charge / discharge power calculation unit 108 obtains an installation position of the storage battery that minimizes the total value (evaluation value). The manner in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by Expression (23).

本実施形態に係る蓄電池設置支援装置１００は、このように蓄電池の設置位置及び充放電電力を求めることにより、電力系統内の様々な場所で事故が発生した場合の電力系統内で生じる事故の最も大きな影響を最小化することができるような蓄電池の設置場所及び事故ごとの充放電電力を求めることができる。

The storage battery installation support apparatus 100 according to the present embodiment calculates the most of the accidents that occur in the power system when an accident occurs in various places in the power system by obtaining the installation position and charge / discharge power of the storage battery in this way. It is possible to obtain the storage battery installation location and charge / discharge power for each accident that can minimize the large influence.

  When reactive power is also supplied from the storage battery, the state in which the optimum arrangement and charge / discharge power calculation unit 108 obtains the minimum value of the evaluation value can be expressed by equations (24) and (25).

ただし、各変数の定義は式（４）〜（８）、（１２）、（１３）により定められる。

However, the definition of each variable is determined by the equations (4) to (8), (12), and (13).

  Next, when the storage battery is installed at a position determined by the storage battery installation support apparatus 100 according to the present embodiment, excessive power is transmitted to the transmission line or the distribution line when a power system failure occurs. Will be described with reference to FIG. 17 to FIG. 20.

As shown in FIG. 17 and FIG. 18, a power system configured by connecting a power source S that supplies active power P _s and reactive power Q _s and a load L via two transmission / distribution lines T is shown. Think. As shown in FIG. 18, active power flows through each line of the transmission and distribution line T by 0.5 _Ps .

At this time, the active power P _r and the reactive power Q _r supplied to the load L via the transmission / distribution line T have a voltage phase of the power source S based on the voltage phase of the load L as shown in FIG. Is known by the following equation (26).

電力系統に事故が発生していない時は、図１８に示すように、送配電線Ｔの各回線には、有効電力が0.5P_rずつ流れているが、図１９に示すように、2回線の送配電線Ｔのうち1回線が事故により断線すると、断線していない方の送配電線Ｔには2倍の有効電力P_rが流れる。そのため、式（２６）に示す関係に従って、事故後における負荷Ｌと電源Ｓとの電圧位相差δも2倍となる。また限界値以上に有効電力が流れた場合、さらに断線が発生する可能性がある。

When no accident occurs in the power system, as shown in FIG. 18, each line of the transmission and distribution lines T, but the active power is flowing by 0.5P _r, as shown in FIG. 19, two-line If one of the transmission / distribution lines T is disconnected due to an accident, twice the active power _Pr flows through the undisconnected transmission / distribution line T. Therefore, the voltage phase difference δ between the load L and the power source S after the accident is also doubled according to the relationship shown in the equation (26). Further, when the active power flows beyond the limit value, there is a possibility of further disconnection.

  In order to prevent such a situation, as shown in FIG. 20, by providing a storage battery C and outputting effective power from the storage battery C, the effective power flowing through the unconnected wire T is suppressed. be able to. At this time, the voltage phase difference δ between the load L and the power source S is also reduced.

  Therefore, by simulating an accident that occurs in the power system, and determining the location and charge / discharge power of the storage battery that minimizes the change in voltage phase difference that occurs at each point at the time of the accident, before installing the storage battery In addition, it is possible to calculate the optimum arrangement and optimum charge / discharge power of the storage battery that prevents excessive electric power from being transmitted to the transmission line or the distribution line.

== Second Embodiment ==
The storage battery installation support apparatus 100 according to the second embodiment can further shorten the calculation time for obtaining the optimal arrangement position and charge / discharge power of the storage battery with respect to the storage battery installation support apparatus 100 according to the first embodiment. It is configured to be possible.

  More specifically, the storage battery installation support apparatus 100 according to the present embodiment determines simulation parameters based on impedance information included in the system information, and reduces the number of simulations by storing simulation history, thereby calculating time. Can be shortened.

  Although details will be described later, the storage battery installation support apparatus 100 repeatedly performs the second power flow calculation while sequentially moving the storage battery installation candidate positions to adjacent nodes selected based on the electrical characteristics of each branch.

  As shown in FIG. 21, the storage battery installation support apparatus 100 according to the present embodiment includes a data reading unit 101, a simulation command unit 102, a storage battery setting unit 103, a system fault setting unit 104, a power flow calculation unit 105, and a voltage phase difference calculation. Unit 106, evaluation value calculation unit 107, optimal arrangement and charge / discharge power calculation unit 108, parameter storage unit 141, power system data storage unit 142, voltage phase difference storage unit 143, and simulation history storage unit 145. It is configured.

  Each of these functions will be described while explaining the flow of processing performed by the storage battery installation support device 100 according to the present embodiment, which will be described later, together with the description of the first embodiment.

  In the following, an embodiment in which the storage battery charges and discharges only active power when the simulation classification is set to 1 will be described. When the simulation classification is 2, 3, or 4, and when the storage battery supplies reactive power, it can be implemented by making the same changes as described in the first embodiment.

  A flowchart showing the flow of processing performed by the storage battery installation support apparatus 100 is shown in FIG.

  Also in this embodiment, it is assumed that various information such as system information and input parameters are already set in the parameter storage unit 141 and the power system data storage unit 142.

  First, the storage battery installation support apparatus 100 performs a power flow calculation (first power flow calculation) assuming that no accident has occurred in the power system, and obtains a voltage phase difference between adjacent nodes in the power system (S2000, S2010). ).

  Specifically, the simulation command unit 102 causes the power flow calculation unit 105 to perform power flow calculation (first power flow calculation) using the grid information recorded in the power grid data storage unit 142. Then, the power flow calculation unit 105 calculates the power flow, the voltage of each node, the voltage phase, and the like when no accident has occurred in the power system (S2000).

  Next, the simulation command unit 102 instructs the voltage phase difference calculation unit 106 from the voltage phase at each node obtained by the first power flow calculation performed by the power flow calculation unit 105 before the occurrence of a system fault between adjacent nodes. Is calculated and stored in the normal phase difference table 143A (S2010).

  Next, the simulation command unit 102 performs initial setting of the storage battery (S2020). As an example, the simulation command unit 102 according to the present embodiment randomly arranges storage batteries on the nodes at the time of initial setting. For example, in the case of performing a simulation for obtaining the optimum arrangement location of three storage batteries, the simulation command unit 102 initially arranges three storage batteries on the node at random. For example, FIG. 23 shows a state in which the storage battery A is initially placed at the node (21), the storage battery B is placed at the node (37), and the storage battery C is placed at the node (30).

  Next, the simulation command unit 102 performs storage battery arrangement and charge / discharge power setting (S2030). The simulation command unit 102 acquires the optimal solution from the optimal solution storage table 145B when the optimal solution of the storage battery placement and charge / discharge power is recorded in the optimal solution storage table 145B described later. When the optimal solution is not recorded in the optimal solution storage table 145B, the simulation command unit 102 acquires the initial setting set in S2020.

  Then, the simulation command unit 102 sets the next installation candidate position of the storage battery based on the electrical characteristics described in the branch information table 142C.

  For example, as shown in FIG. 23, the node (21) in which the storage battery A is arranged in the initial setting is adjacent to the node (11), the node (23), and the node (22), but referring to the branch information table 142C It can be seen that the impedance (r, x) between the node (21) and the node (22) is the smallest.

  Therefore, for example, the simulation command unit 102 sets the next placement candidate position of the storage battery A at the node (22), the storage battery B remains at the node (37), and the storage battery C remains at the node (30).

  The simulation command unit 102 confirms whether or not the next placement candidate position is already included in the simulation history table 145A. If it is included in the history table 145A, the placement node of the storage battery A is returned to the node (21). The arrangement of the storage battery B is set based on the impedance information. If the newly set placement candidate position is also included in the simulation history table 145A, the placement node of the storage battery B is returned to the node (37), and the placement of the storage battery C is set based on the impedance information. When the newly set placement candidate position is also included in the simulation history table 145A, the placement node of the storage battery C is returned to the node (30), and the placement node of the storage battery A has the second impedance around the node (21). To the node (23) of the smaller branch, and confirms whether the newly set placement candidate position is included in the simulation history table 145A. The simulation command unit 102 sequentially repeats this procedure until an arrangement not included in the simulation history table 145A is obtained. All the setting candidates that can be set by the above procedure are confirmed for the optimal solutions 22, 30, and 37, and if all of them are included in the simulation history table 145A, the next evaluation is performed from the simulation history table 145A. An arrangement having a small value is acquired, and arrangements not included in the simulation history table 145A are sequentially searched according to the above procedure. Even if all the setting candidates that can be set by the above procedure are confirmed from the simulation history table 145A for the arrangement having the next smallest evaluation value after the optimal solution, candidates that are not included in the simulation history table 145A cannot be obtained. Then, an arrangement having the next smallest evaluation value after the optimal solution is acquired, and arrangements not included in the simulation history table 145A are sequentially searched according to the above procedure. If an arrangement that is not included in the simulation history table 145A is not obtained even if the above procedure is performed for all the arrangements existing on the simulation history table 145A, it is within the range not included in the simulation history table 145A. A random storage battery is placed on the node.

  Next, the simulation command unit 102 sets a storage battery (S2040). Specifically, the simulation command unit 102 notifies the storage battery setting unit 103 of information on the position (node number) of the storage battery installed in the power system and the charge / discharge power. Then, the storage battery setting unit 103 operates the active power column in the row of the corresponding node number in the node information table 142A of the power system data storage unit 142 so as to represent the state where the storage battery is installed in the node. In this way, the charge / discharge active power of the storage battery is set as the active power in the node information table 142A.

  Next, the simulation command unit 102 notifies the grid fault setting unit 104 of information related to the position (branch number) of the fault occurring in the power system. Then, the system fault setting unit 104 operates the values of the r, x, and b fields in the corresponding branch number row of the branch information table 142C of the power system data storage unit 142, and a system fault occurs in that branch. The state is displayed (S2050). In this way, the values in the r, x, and b fields of the branch information table 142C are changed so as to simulate the state when the accident occurred.

  Next, the simulation command unit 102 causes the power flow calculation unit 105 to perform power flow calculation (second power flow calculation) using the grid information recorded in the power grid data storage unit 142. Then, the power flow calculation unit 105 reads the data in the power system data storage unit 142 in which the settings relating to the storage battery and the settings related to the grid fault are reflected, and the power flow and the voltage and voltage phase of each node when the fault occurs in the power grid. Etc. are calculated (S2060).

  Next, the simulation command unit 102 sends each of the voltage phase difference calculation unit 106 obtained by the power flow calculation (second power flow calculation) assuming that an accident has occurred in the power system performed by the power flow calculation unit 105. The voltage phase difference after the occurrence of a system fault between adjacent nodes is calculated from the voltage phase at the node. The voltage phase difference calculation unit 106 stores the calculated phase difference in the accident occurrence phase difference table 143B (S2070).

  Next, based on the data stored in the voltage phase difference storage unit 143 (phase difference between adjacent nodes before and after the occurrence of the accident), the simulation command unit 102 stores the simulation value table 141A in the simulation parameter table 141A. An evaluation value is calculated using an evaluation formula selected according to the described simulation category (S2080).

  The evaluation value calculation unit 107 calculates the difference between the phase difference between adjacent nodes recorded in the normal phase difference table 143A and the phase difference between adjacent nodes recorded in the accident occurrence phase difference table 143B. (That is, the difference in phase difference) is obtained for each adjacent node. And as an example, the evaluation value calculation part 107 totals the difference of the phase difference between each adjacent node in an electric power grid | system, and records the total value in the simulation log | history memory | storage part 145 as an evaluation value.

  As shown in FIGS. 24 and 25, the simulation history storage unit 145 includes a simulation history table 145A and an optimum solution storage table 145B.

  As shown in FIG. 24, the evaluation value calculation unit 107 records the evaluation value in the simulation history table 145A in the simulation history storage unit 145 together with the storage battery arrangement and charge / discharge power.

  Next, the optimum arrangement and charge / discharge power calculation unit 108 displays the storage battery arrangement position, the charge / discharge power, and the evaluation value at which the evaluation value is minimum among the evaluation values recorded in the simulation history table 145A. And stored in the optimum solution storage table 145B (S2090).

  The simulation command unit 102 changes the arrangement combination of the storage batteries based on the impedance information and repeats the process until the simulation end condition is satisfied with a combination that does not overlap with the history stored in the simulation history table 145A (S2100).

  The simulation end condition can be set as a condition in which the optimal solution storage table 145B is not updated even when a certain period of time elapses, the number of simulation repetitions, or a certain number of simulations is repeated, or a combination thereof. .

  When the simulation end condition is satisfied, the optimum arrangement and charge / discharge power calculation unit 108 extracts the arrangement position and charge / discharge power of the storage battery that minimizes the evaluation value stored in the optimum solution storage table 145B (S2110). ). Then, the optimum arrangement and charge / discharge power calculation unit 108 outputs the optimum arrangement position and optimum charge / discharge power of the storage battery to the output device 160.

  As described above, the storage battery installation support apparatus 100 according to the present embodiment repeatedly performs the second power flow calculation while sequentially moving the storage battery installation candidate positions to the adjacent nodes selected based on the electrical characteristics such as impedance. By doing so, the optimal arrangement location and charge / discharge power of the storage battery can be calculated without simulating the entire arrangement pattern of the storage battery, so that the calculation time can be greatly shortened.

  Moreover, since the storage battery installation assistance apparatus 100 which concerns on this embodiment sets the initial arrangement | positioning of a storage battery at random, it can improve possibility that the time required to obtain an optimal solution can be shortened.

== Third Embodiment ==
The storage battery installation support apparatus 100 according to the first embodiment and the second embodiment selects one of the categories 1 to 4 and performs the simulation, but the storage battery installation support apparatus 100 according to the third embodiment In addition to the sections 1 to 4, the section 5 can be selected to perform the simulation.

  When the category 5 is selected, the storage battery installation support device 100 performs the simulation of all the categories of the category 1, the category 2, the category 3, and the category 4. And the storage battery installation assistance apparatus 100 outputs the result (the optimal arrangement | positioning position of a storage battery, and the charging / discharging electric power for every accident) which performed the simulation of each division, respectively.

  By such an aspect, it becomes possible to determine the optimal arrangement position of the storage battery and charge / discharge power for each accident in the assumption of every accident occurrence pattern.

  Each embodiment described above is for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

  For example, in the second embodiment, when the next placement candidate position of the storage battery is determined, a metaheuristic method such as tabu search can be applied.

DESCRIPTION OF SYMBOLS 100 Storage battery installation assistance apparatus 101 Data reading part 102 Simulation command part 103 Storage battery setting part 104 System fault setting part 105 Power flow calculation part 106 Voltage phase difference calculation part 107 Evaluation value calculation part 108 Optimal arrangement and charge / discharge power calculation part 110 CPU
120 Memory 130 Communication Device 140 Storage Device 141 Parameter Storage Unit 141A Simulation Parameter Table 141B Battery Setting Table 142 Power System Data Storage Unit 142A Node Information Table 142B Generator Information Table 142C Branch Information Table 143 Voltage Phase Difference Storage Unit 143A Normal Phase Difference Table 143B Accident occurrence phase difference table 144 Evaluation value storage unit 144A Evaluation value list table 145 Simulation history storage unit 145A Simulation history table 145B Optimal solution storage table 150 Input device 160 Output device 170 Recording medium reader 180 First power flow calculation execution unit 181 Second power flow calculation execution unit 182 Storage battery information acquisition unit 183 Installation plan selection unit 184 Output unit 300 Power system data 600 Control program 800 Recording medium S Power supply L Load T Transmission line C Storage battery

Claims (11)

A first tidal current calculation execution unit for performing a first tidal current calculation assuming a situation in which no accident has occurred in the power system, using system information representing a configuration of the power system;
A storage battery information acquisition unit for acquiring information on the storage battery installed in the power system;
Using the information related to the storage battery and the grid information, a second power flow calculation is performed assuming a situation where an accident has occurred in the power grid when the storage battery is installed at each candidate position in the power grid. A second tidal current calculation execution unit;
From the result of the first power flow calculation and the result of the second power flow calculation, an evaluation value indicating the degree of change in the voltage phase difference between adjacent nodes in the power system before and after the accident is obtained, and the evaluation value An installation plan selection unit that determines the charge / discharge power for each storage battery and the installation position of the storage battery,
A storage battery installation support device comprising: The storage battery installation support device according to claim 1,
The second tidal current calculation execution unit
The storage battery installation support device, wherein the second power flow calculation is performed assuming that the accident occurs at a specific position in the power system. The storage battery installation support device according to claim 2,
The installation plan selection section
The sum of the difference between the phase difference between the adjacent nodes calculated by the first power flow calculation and the phase difference between the adjacent nodes calculated by the second power flow calculation in the power system. As the evaluation value for each installation candidate position of the storage battery, and the installation candidate position and charge / discharge power at which the sum is minimized are determined as the installation position and charge / discharge power of the storage battery. The storage battery installation support device according to claim 2,
The installation plan selection section
The storage battery using the maximum value of the difference between the phase difference between the adjacent nodes calculated by the first power flow calculation and the phase difference between the adjacent nodes calculated by the second power flow calculation as the evaluation value. The storage battery installation support apparatus, wherein the installation candidate position and the charge / discharge power at which the maximum value is minimized are determined as the installation position and charge / discharge power of the storage battery. The storage battery installation support device according to claim 1,
The second tidal current calculation execution unit
The storage battery installation support device, wherein the second power flow calculation is performed when the accident occurs at each position where the accident can occur in the electric power system. The storage battery installation support device according to claim 5,
The installation plan selection section
The sum of the difference between the phase difference between the adjacent nodes calculated by the first power flow calculation and the phase difference between the adjacent nodes calculated by the second power flow calculation in the power system. For each installation candidate position of the storage battery and for each occurrence location of the accident, and a sum total obtained by adding the sum for each candidate installation position of the storage battery is obtained as the evaluation value, and the installation where the total value is minimized A storage battery installation support apparatus, wherein charge / discharge power for each candidate position and accident is determined as the installation position of the storage battery and charge / discharge power for each accident. The storage battery installation support device according to claim 5,
The installation plan selection section
The maximum value of the difference between the phase difference between the adjacent nodes determined by the first power flow calculation and the phase difference between the adjacent nodes determined by the second power flow calculation is set as the storage battery installation candidate. Obtained for each position and for each location where the accident occurred, and obtained a total value obtained by adding the maximum values for each installation position of the storage battery as the evaluation value, and for each installation candidate position and accident where the total value is minimized. A storage battery installation support apparatus, wherein charge / discharge power is determined as the installation position of the storage battery and the charge / discharge power for each accident. The storage battery installation support device according to claim 1,
The grid information includes information indicating electrical characteristics of electric lines between the adjacent nodes in the power system,
The second tidal current calculation execution unit repeatedly performs the second tidal current calculation while sequentially moving a position where the storage battery is installed to an adjacent node selected based on the electrical characteristics. Support device. A storage battery installation support device according to any one of claims 1 to 8,
An output unit for outputting information indicating the charge / discharge power for each installation position and accident of the storage battery;
A storage battery installation support device, further comprising: A method for controlling a storage battery installation support device that determines the installation position of a storage battery in an electric power system,
The storage battery installation support device performs a first power flow calculation assuming a situation in which no accident has occurred in the power system, using system information representing the configuration of the power system,
The storage battery installation support device acquires information about the storage battery installed in the power system,
Assuming a situation in which an accident has occurred in the power system, when the storage battery installation support device uses the information on the storage battery and the system information to install the storage battery at each candidate position in the power system. Second tidal current calculation
The storage battery installation support device evaluates the degree of change in voltage phase difference between adjacent nodes in the power system before and after the accident from the result of the first power flow calculation and the result of the second power flow calculation. And determining the storage battery installation position and charge / discharge power for each accident based on the evaluation value. To the storage battery installation support device that determines the installation position of the storage battery in the power system,
Using the system information representing the configuration of the power system, a procedure for performing a first power flow calculation assuming a situation in which no accident has occurred in the power system,
A procedure for obtaining information on a storage battery installed in the power system;
Using the information related to the storage battery and the grid information, a second power flow calculation is performed assuming a situation where an accident has occurred in the power grid when the storage battery is installed at each candidate position in the power grid. Procedure and
From the result of the first power flow calculation and the result of the second power flow calculation, an evaluation value indicating the degree of change in the voltage phase difference between adjacent nodes in the power system before and after the accident is obtained, and the evaluation value A procedure for determining the charging / discharging power of each storage battery based on the installation position of the storage battery, and
A program for running

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