JP6173193B2 - Arrangement planning support apparatus and arrangement planning support method for sensor built-in switch - Google Patents

Description

  The present invention relates to a technique for planning measurement of a power system.

  Regarding power systems, in recent years, there has been an increasing demand for maintenance of frequency and voltage when introducing distributed power sources and efficient use of facilities of electric power companies. For this reason, it is important to manage whether the power state such as voltage and current representing the state of the power system is within an appropriate range. In this power state management, a measuring device (sensor) that is installed at a limited point in the power system is used to measure the power state. Using the measurement information, power is calculated using a power state calculation method called power flow calculation or state estimation. Estimate the power state at any point in the system.

  Patent Document 1 states that, “In the voltage management and operation control of the distribution line, the installation location of the measuring instrument necessary for grasping the distribution of the distribution line voltage and the power flow state is the least effective (distribution line state). Calculation accuracy etc.) can be determined.

  In this technique, the voltage / tidal current state in each time section is obtained from the system data and demand data in a plurality of time sections, and the first electric quantity at the measuring device installation position candidate point is once calculated as a true value. Then, a part of the measuring instrument installation position candidate point is temporarily set, the system state is calculated from the calculated electric quantity of the measuring instrument installation position, and the second electric quantity of the measuring instrument installation position candidate point is calculated. Then, the difference between the first electric quantity and the second electric quantity is evaluated as an error. The error is evaluated for all combinations of the temporarily set measuring instrument installation position candidate points, and the measuring instrument installation position that minimizes the error is obtained as an optimal solution.

  Patent Document 2 describes a state estimation method for estimating a power state at an arbitrary point in a power system.

JP 2008-072791 A JP 2013-074639 A

  In the technique of Patent Document 1, calculation processing is necessary for all combinations of measuring instrument installation position candidate points. Therefore, the number of candidate points increases, the number of combinations increases significantly, and the calculation takes time. It is considered necessary.

  In order to solve the above problems, an arrangement planning support apparatus according to an aspect of the present invention includes power system data indicating the arrangement of equipment and measuring devices in a power system, power sent to the power system, and loads in the power system. A storage unit that stores power state data indicating the power level, and a calculation unit that performs a calculation for determining the arrangement based on the power system data and the power state data. As a load center point in the power system, a plurality of load center point positions according to a plurality of load center point conditions are determined using the power system data and the power state data, and a voltage distribution in the power system is determined. Calculating a plurality of voltage distributions based on the respective load center point positions using the power system data and the power state data, and estimating a fluctuation amount indicating a magnitude of a voltage fluctuation between the plurality of voltage distributions. Then, it is determined whether or not the variation amount satisfies a predetermined variation condition.

  According to one aspect of the present invention, it is possible to quickly plan the arrangement of measuring devices in a power system.

The structure of the measuring device arrangement | positioning plan assistance apparatus of Example 1 is shown. An example of composition of an object electric power system is shown typically. An example of node equipment data is shown. An example of branch equipment data is shown. An example of fluctuation condition data is shown. The modification of fluctuation condition data is shown. An example of reference node data is shown. An example of load node data is shown. An example of load center point node data is shown. An example of load center point distribution data is shown. An example of branch state data is shown. A voltage fluctuation amount estimation process is shown. An example of a section is shown typically. An example of a 1st voltage profile is shown. An example of a 1st voltage profile, a 2nd voltage profile, and a 3rd voltage profile is shown. An arrangement determination process is shown. An example of branch state data at the time of adding a measuring device is shown. An example of load center point node data when a measuring device is added is shown. An example of load center point distribution data when a measuring device is added is shown. An example of the 1st voltage profile, the 2nd voltage profile, and the 3rd voltage profile at the time of adding a measuring device is shown. An example of the output data 15 of Example 1 is shown. The modification of the output data 15 of Example 1 is shown. The structure of the measuring device arrangement | positioning plan assistance apparatus of Example 2 is shown. An example of the output data 15 of Example 2 is shown. The modification of the output data 15 of Example 2 is shown. The operation of the placement correction process is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  As an embodiment of the arrangement plan support apparatus of the present invention, a measurement apparatus arrangement plan support apparatus that calculates the number and positions of measurement apparatuses arranged in the power system will be described. The measuring device is a device that detects a power state such as a current or a voltage, such as a sensor built-in switch or an instrument transformer. The sensor built-in switch is a switch having a sensor for detecting a power state.

  FIG. 1 illustrates a configuration of a measurement device arrangement plan support device according to the first embodiment.

  This measuring device arrangement plan support device 1 is, for example, a computer. The computer includes a memory (storage unit) and a processor (arithmetic unit). The memory stores programs and data. The processor executes the measurement device arrangement plan support process according to the program stored in the memory. This program may be stored in a computer-readable storage medium. The computer may include a communication unit that communicates with other computers, an input device that receives input from a user, a display device that displays data output from the computer, and the like.

  The measurement device arrangement plan support apparatus 1 includes power system data 10, condition input data 11, an input unit 12, a voltage fluctuation amount estimation unit 13, an arrangement determination unit 14, and output data 15.

  Next, the outline | summary of operation | movement of the measuring device arrangement | positioning plan assistance apparatus 1 is demonstrated. The power system data 10 indicating the equipment constituting the target power system to be subjected to the measurement device arrangement plan support process, and the condition input data 11 including various data indicating the power state of the target power system and the target voltage fluctuation amount are stored. Stored in the device. The input unit 12 reads the power system data 10 and the condition input data 11 from the storage device. Next, the arrangement determination unit 14 changes the additional installation data indicating the arrangement of the additional measurement device that is the measurement device to be added, and the voltage fluctuation amount estimation unit 13 is based on the power system data 10 and the condition input data 11. A voltage fluctuation amount in the power system is estimated as an estimated voltage fluctuation amount. The additional installation data indicates the additional installation number and the additional installation position. Then, the arrangement determining unit 14 determines additional installation data so that the estimated voltage fluctuation amount satisfies a predetermined fluctuation condition, and outputs the determined results as output data 15.

  Next, the target power system will be described.

  FIG. 2 schematically shows an example of the configuration of the target power system.

  This target power system includes a node representing a point and a branch connecting adjacent nodes. The node represents an installation location of a substation, power pole, power transmission tower, power system equipment (transformer or tidal current control equipment), and the like. The branch represents an electric wire such as a transmission / distribution electric wire. In this embodiment, the node 20a represents a transformer of a distribution substation, and the nodes 20b, 20c, 20d, 20e, and 20f all represent utility poles as measurement device installation candidate sites. Each of the branches 21a, 21b, 21c, 21d, and 21e represents a line section of the transmission and distribution line. In order to simplify the explanation, the target power system of the present embodiment shows a simple system without a branch, but it may be a system including a branch. In the drawings and the following description, a symbol attached to a node may be expressed as a node ID.

  Next, the detail of each part of the measuring device arrangement | positioning plan assistance apparatus 1 is demonstrated.

  The power system data 10 and the condition input data 11 are stored in a storage device such as a hard disk device in the measurement device arrangement plan support device 1 or connected to the measurement device arrangement plan support device 1. Instead of the hard disk device, various data storage devices or data storage media such as a flash memory, an optical disk represented by a DVD-ROM, and a magnetic tape may be substituted.

  The input unit 12 reads the power system data 10 and the condition input data 11 from the storage device and inputs them to the main memory of the measurement device arrangement plan support device 1.

  Next, an example of the power system data 10 for the above-described target power system is shown.

  The power system data 10 is data relating to the facilities that constitute the target power system. The power system data 10 includes node equipment data that is node information and branch equipment data that is branch information.

  FIG. 3 shows an example of node equipment data.

  This node equipment data includes a node ID 30, a reference node flag 31, a measuring device installation possible flag 32, and a measuring device installed flag 33 for each node. The node ID 30 is a unique ID for identifying the node. The node ID 30, the reference node flag 31, the measurement device installation possible flag 32, and the measurement device installation completed flag 33 respectively indicate whether or not the reference node, the measurement device installation possible, and the measurement device installation completed. It is for identifying. In each flag, 0 means “not applicable” and 1 means “applicable”. Here, the reference node is a node used as a reference when calculating the voltage fluctuation, and is usually the installation position of the measuring device already installed near the transformer in the substation. In this embodiment, the node 20a corresponds to the reference node. “A measurement device can be installed” means, for example, that a power pole exists and a measurement device can be installed. In this embodiment, all nodes other than the nodes 20b and 20f correspond to the installation of the measuring device. The measurement device installed flag means that the measurement device is already installed. In the present embodiment, only the node 20a corresponds to the installation of the measuring device.

  FIG. 4 shows an example of branch facility data.

  This branch facility data includes a branch ID 40, a branch node ID 41, an end node ID 42, a resistance (R) 43, a reactance (X) 44, and a distance 45 for each branch. The branch ID 40 is a unique ID for identifying a branch. The start node ID 41 and the end node ID 42 are node IDs of nodes at both ends of the branch. Of the nodes at both ends, a node closer to the reference node is a start node and a node far from the reference node is an end node. The resistance (R) 43, the reactance (X) 44, and the distance 45 indicate the resistance, reactance, and distance of the line (electric wire) in the branch, respectively. In addition, the branch facility data may include branch attribute data such as capacitance and line type names indicating the types of electric wires.

  Note that it is not always necessary to define a node by faithfully dividing all facilities, and it may be defined as a so-called contracted node in which a plurality of facilities are integrated and defined as one node. In that case, a plurality of branches are integrated according to the node. Thus, by integrating nodes and branches, the scale of data to be handled can be reduced, and the amount of calculation required for the measurement device arrangement plan support process can be reduced. For this reason, when there is no problem in reducing the number of installation position candidates for the measuring device, the nodes and branches may be integrated in this way.

  Next, an example of the condition input data 11 will be described.

  The condition input data 11 includes variation condition data indicating a variation condition and power state data of the target power system. The fluctuation condition data includes, for example, a target voltage fluctuation amount that is an upper limit of the estimated voltage fluctuation quantity. The target voltage fluctuation amount indicates the maximum allowable voltage error in the voltage monitoring operation of the target power system. Either the voltage error [volts] or the voltage error rate [%] (percentage of voltage error with respect to the reference voltage) It is represented by The input unit 12 acquires the fluctuation condition data based on the input from the user and stores it in the condition input data 11. Note that the fluctuation condition data may indicate the range of the estimated voltage fluctuation amount.

  FIG. 5 shows an example of the fluctuation condition data. The fluctuation condition data of the present embodiment includes a target voltage fluctuation amount that is common in the target power system.

  FIG. 6 shows a variation of the variation condition data. This variation condition data may be set for each point in the target power system. This fluctuation condition data includes a target voltage fluctuation amount ID 250, a node ID 251, and a target voltage fluctuation amount 252 for each node. This means that the target voltage fluctuation amount is not determined for a node (node 20a) not set in the fluctuation condition data.

  The power state data is data necessary for estimating a power flow such as voltage, current, active power, reactive power and the like at an arbitrary point of the target power system. The power state data includes node state data indicating the power state of the node and branch state data indicating the power state of the branch. The node state data includes reference node data indicating a reference node in the target power system and load state data indicating a load in the target power system. The load state data is any one of load node data, load center point node data, and load center point distribution data. Node state data may be provided by a user. Alternatively, it may be a value obtained by obtaining a value measured during a predetermined period using a measuring device such as an AMI (Advanced Metering Infrastructure) smart meter and performing statistical processing (such as an average value).

  FIG. 7 shows an example of reference node data, and FIG. 8 shows load node data.

  The reference node data indicates a reference node in the target power system, and the load node data represents a load node having a load. Each of the reference node data and the load node data includes a node ID 50, a voltage 51, a load active power 52, and a load reactive power 53 for each node. In addition, the reference node data and the load node data may include a power factor. Although the voltage 51 needs to be applied to the node 20a corresponding to the reference node in the reference node data, the voltage 51 does not necessarily have to be applied to the node in the load node data. In the load node data, data having no voltage 51 value indicates that no voltage is applied. The applied voltage may be a voltage value measured in a certain time section, or may be an appropriate voltage assumed from a consumer load capacity (contract capacity). The load active power 52 and the load reactive power 53 represent active power and reactive power consumed at the corresponding node as viewed from the target power system. These have positive and negative signs, but positive indicates power consumption and negative indicates supply power (sending power). The node 20a, which is a reference node, is a substation node, and can be regarded as being supplied with power from this node when viewed from the target power system. Therefore, negative values are given to the load active power 52 and the load reactive power 53 of the reference node. On the other hand, positive values are given to the load active power 52 and the load reactive power 53 of the nodes 20b, 20d, and 20f that are load nodes. This means that power is consumed at these nodes. If a generator is installed at these nodes and power is supplied to the target power system, a negative value is given. It should be noted that the load active power 52 and the load reactive power 53 need not be given to a node without a load, and the load valid power 52 and the load reactive power 53 need to be given to a node that does not. Here, it is necessary to set the power supplied from the reference node to the target power system (active power 2000 kW, reactive power 500 kW) and the sum of the power consumption of all the load nodes. For example, the power consumption of each load node is estimated by dividing the supply power of the reference node according to the consumer load capacity of each load node. Actually, the latter becomes larger by the amount of the loss in the electric wire, but it is ignored here because the influence is small.

  FIG. 9 shows an example of load center point node data.

  In the load node data described above, it is necessary to give load active power and load reactive power to all the nodes where the load exists. In the load center point node data, one load center point node is determined for each section in the target power system, and the total load power in the section is intensively given thereto. A range of branches delimited by a measuring device or a branch point installed in the target power system is called a section. In the present embodiment, since the measuring device is installed only at the reference node, the target power system is not divided into a plurality of sections. That is, the target power system is one section 700. In the drawings and the following description, a symbol assigned to a section may be represented as a section ID.

  The load center point position is, for example, the position of the center of gravity of the load power in the section. The node at the load center point is, for example, the node closest to the load center point position. The load center point node data includes, for each section, a section ID 70 for identifying the section, a start point node ID 71 and an end point node ID 72 of the section, a load center point node ID 73 indicating the load center point node in the section, Load active power 74 and load reactive power 75 at the load center point node are included.

  FIG. 10 shows an example of load center point distribution data.

  Similarly to the load center point node data, the load center point distribution data indicates the load center point for each section. The load center point node data described above specifies a specific node as the load center point, but the load center point distribution data specifies the distance from the start point of each section to the load center point position, and the load center point. Specify position variation. The load center point distribution data includes, for each section, a section ID 80 for identifying the section, a start node ID 81 and an end node ID 82 of the section, a center distance 83 representing the average of the load center positions in the section, It includes a standard deviation 84 representing variations in the load center point position, and a load active power 85 and a load reactive power 86 at the load center point position. Here, the center distance 83 is given as a distance from the start node of the section.

  The load state data of the present embodiment is load center point data.

  FIG. 11 shows an example of branch state data.

  The branch state data includes a branch ID 60, a passing current 61, a passing active power 62, and a passing reactive power 63 for each branch. In addition, the branch state data may include a power factor. The passing current 61 is a current value passing through the branch. Passing active power 62 and passing reactive power 63 are active power and reactive power passing through the branch, respectively. The passing active power 62 and the passing reactive power 63 have positive and negative signs. For the passing current 61 and the passing active power 62, positive values are current and active power flowing in the forward direction (from the substation side to the terminal side), and negative values are in the reverse direction (so-called reverse power flow). means. For the passing reactive power 63, a positive value indicates that the passing reactive power is in a delayed phase, and a negative value indicates that it is a leading phase. It is not necessary to give branch state data to all branches, but at least branch state data needs to be given to the branch of the reference node (substation). In this embodiment, the measuring device is installed on the secondary side (terminal side) of the node. When a new measuring device is installed, the power state is measured with respect to the branch of the installed node, so branch state data of the branch where the measuring device is installed is given.

  In the above example, power state data in one time section is shown, but power state data in a plurality of time sections may be used. In that case, data similar to the power state data described above is given for each time section.

  Hereinafter, the voltage fluctuation amount estimation processing by the voltage fluctuation amount estimation unit 13 will be described.

  In the voltage fluctuation amount estimation process, the voltage fluctuation amount estimation unit 13 uses a plurality of load center point positions to calculate a plurality of voltage profiles (voltage distributions) of the target power system based on the power system data 10 and the condition input data 11, respectively. The estimated voltage fluctuation amount is calculated based on a plurality of voltage profiles.

  FIG. 12 shows voltage fluctuation amount estimation processing.

  First, the voltage fluctuation amount estimation unit 13 determines the load center point position using the power system data 10 and the condition input data 11 read by the input unit 12 (S90). Here, the voltage fluctuation amount estimation unit 13 uses the node state data in the condition input data 11 to determine the first load center point position, the second load center point position, and the third load center point position for each section. decide. In this embodiment, it is assumed that the node state data includes load center point node data. In the first load center point condition in the present embodiment, the node indicated by the load center point node ID 73 of the load center point node data is set as the first load center point. Here, the voltage fluctuation amount estimation unit 13 determines the node 20d indicated by the load center point node ID 73 as the first load center point.

  When the node state data is load node data, since the load power of each node is given, the voltage fluctuation amount estimation unit 13 concentrates the total load at a certain point and places the first load center point position. And The point does not necessarily need to be a node, and may be an arbitrary point on the branch. At this time, the first load center point position is determined so that a voltage drop obtained by power flow calculation or state estimation described later is close to the load node data. If the voltage drop is close to each other in the load node data and the load center point node data, it can be said that the load node data and the load center point node data are equivalent in terms of the voltage drop. When the node state data includes the load center point distribution data and the load center point position is given by the center distance of the section, the position of the center distance is the first load center point position.

  Next, a method in which the voltage fluctuation amount estimation unit 13 determines the second load center point position and the third load center point position will be described.

  FIG. 13 schematically shows an example of a section.

  The section 101 includes nodes 100a, 100d, 100b, 100e, and 100c in order from the reference node side. The node 100a is the node closest to the reference node in the section, and corresponds to the node 20a that is the start point node in the section 700. The node 100c is a node farthest from the reference node in the section, and corresponds to the node 20f that is the end node in the section 700. The node 100b is the first load center point position.

  Since the load magnitude at each point in the section changes from moment to moment, the load center point position is considered to change from moment to moment. Therefore, the load center point position is considered to be distributed within a certain range in the section. The second load center point condition in the present embodiment is the node having the smallest voltage drop in the section from the viewpoint of the voltage drop as the second load center point, and the third load center point condition in the present embodiment is within the section. The node with the largest voltage drop is taken as the third load center point. The node with the smallest voltage drop in the section is the node 20a located closest to the reference node, and the voltage fluctuation amount estimation unit 13 sets this position as the second load center point position. Conversely, the node with the largest voltage drop in the section is the node 20f located farthest from the reference node, and the voltage fluctuation amount estimation unit 13 sets this position as the third load center point position.

  A method for determining the second load center point position and the third load center point position when the node state data includes load center point distribution data will be described. In this case, for example, assuming that the statistically maximum deviation is three times the standard deviation σ (3σ) and the center distance is m, the node 100d at the position where the distance from the reference node is (m−3σ) is The second load center point position is determined, and the node 100e at the position of (m + 3σ) is determined as the third load center point position. However, since the second load center point position and the third load center point position need to be on the section 101, the second load center point position and the third load center point position are outside the section 101. The section start point node 100a that is the limit position is set as the second load center point position, and the section end point node 100c is set as the third load center point position. Alternatively, the second load center point position and the third load center point position may be set on the section 101 in consideration of the actual load distribution in the section.

  Even if the node state data does not include the standard deviation, the section start point node 100a that is the limit position may be set as the second load center point position, the section end point node 100c may be set as the third load center point position, The second load center point position and the third load center point position may be set on the section 101 in consideration of the actual load distribution.

  Returning to the description of the voltage fluctuation amount estimation processing.

  Next, the voltage fluctuation amount estimation unit 13 calculates a voltage profile in the section by performing a power flow calculation using the determined load center point position (S91). In the present embodiment, a case where tidal current calculation is performed will be described. However, by performing state estimation as described in Patent Document 2, a voltage profile similar to tidal current calculation can be calculated.

  The power flow calculation method here is a method based on the voltage drop characteristic known in power system engineering for the line voltage of the target power system. Assuming that the resistance R, the reactance X, and the passing current I in the section are known in the target power system, the voltage drop ΔV in the section can be calculated by the following equation.

  Here, it is assumed that the three-phase voltages are balanced. j represents an imaginary number.

  The load current i is expressed by the following equation using a given load (active power P and reactive power Q) and a reference voltage Vb (for example, 6600 V for a domestic distribution system).

  Next, according to Kirchhoff's first law, the load current i is sequentially accumulated from the terminal side (node 20f) of the target power system to the substation side (reference node 20a), thereby calculating the passing current I of the branch. be able to. As described above, the voltage drop ΔV in each section can be obtained from the resistance R and reactance X of each branch, the node load (active power P and reactive power Q), and the reference voltage Vb. Then, as expressed by the following equation, the voltage V at each node can be calculated by sequentially subtracting the voltage drop ΔV for each branch from the voltage at the reference node (substation transmission voltage V0). it can.

  Here, k is a number indicating all branches from the reference node to the node. Here, the voltage characteristics of the load are assumed to be constant current characteristics. Therefore, it is not necessary to repeat the above current and voltage.

  The above is the procedure of the power flow calculation process using one type of load center point position among the first load center point position, the second load center point position, and the third load center point position. With this power flow calculation, the current and voltage at an arbitrary point in the target power system can be calculated.

  FIG. 14 shows an example of the first voltage profile.

  The first voltage profile 116a is a voltage profile calculated by power flow calculation using the first load center point position. In this figure, the horizontal axis indicates the distance from the reference node, and the vertical axis indicates the voltage. In the first voltage profile 116a, the point 110a corresponds to the node 20a. Similarly, point 111a corresponds to node 20b, point 112a corresponds to node 20c, point 113a corresponds to node 20d, point 114a corresponds to node 20e, and point 115a corresponds to node 20f. The first load center point position is the node 20d indicated by the load center point node ID 73 of the load center point node data. The slope of the first voltage profile 116a changes at a point 113a corresponding to the first load center point position.

  Further, the voltage fluctuation amount estimation unit 13 calculates the second voltage profile by power flow calculation using the second load center point position, and calculates the third voltage profile by power flow calculation using the third load center point position. Thereby, three types of voltage profiles are obtained.

  FIG. 15 shows an example of the first voltage profile, the second voltage profile, and the third voltage profile.

  In the drawing, the first voltage profile 116a, the second voltage profile 116b, and the third voltage profile 116c are superimposed. Here, the first load center point position is the node 20d indicated by the load center point node ID 73 of the load center point node data. The second load center point position is the node 20b close to the start point node indicated by the start point node ID 71 of the load center point node data. The third load center point position is the node 20f indicated by the end point node ID 72 of the load center point node data.

  Returning to the description of the voltage fluctuation amount estimation processing.

  Next, the voltage fluctuation amount estimation unit 13 calculates an estimated voltage fluctuation amount based on the three types of voltage profiles calculated in S91 (S92). The estimated voltage fluctuation amount indicates an estimated value of the maximum voltage error in the target power system.

  In the first voltage profile 116a, a point 115a indicates the voltage of the node 20f calculated using the first load center point position. In the second voltage profile 116b, a point 115b indicates the voltage of the node 20f calculated using the second load center point position. In the third voltage profile 116c, a point 115c indicates the voltage of the node 20f calculated using the third load center point position. Similarly, at any position other than the node 20f, voltages corresponding to the three types of load center point positions are obtained. This arbitrary position is not necessarily limited to the node.

  Here, paying attention to a specific node, voltage values based on three types of load center point positions are compared. For example, focusing on the node 20f, the voltage based on the first load center point position is V5a, the voltage based on the second load center point position is V5b, and the voltage based on the third load center point position is V5c. At this time, V5b is the maximum voltage Vmax at the load center point position where the voltage drop is smallest in the range where the load center point position is distributed, and V5c is the minimum of the load center point position where the voltage drop is largest. It can be considered that the voltage is Vmin. It can be said that the true voltage at the node is distributed within a voltage range between V5c and V5b while the true load center point position, which is actually difficult to grasp, changes every moment. Note that the width W (= V5b−V5c) of this voltage range may be regarded as substantially constant regardless of the reference point voltage V0 of the reference node. The estimated voltage fluctuation amount may be the width W. The maximum error Ve that can be included in the voltage V (V5a) based on the given first load center point position can be expressed by the following equation.

  In this way, paying attention to all positions x to be noted, voltages based on the three types of load center point positions are compared to obtain the maximum error Ve (x). As shown, the system maximum voltage error Vemax is calculated.

  Here, x is a position including nodes and designated in advance by the user.

  That is, the system maximum voltage error indicates the maximum error magnitude from the reference first voltage profile 116a. Normally, the system maximum voltage error is generated at the end of the target power system, and therefore, the position x to be noted specified by the user may be only at each end node. In this embodiment, x indicates the node 20f. However, if a voltage regulator such as an SVR (Step Voltage Regulator) is installed at a point in the middle of the system, there is a possibility that the system maximum voltage error will occur on the primary side (reference node side). It is better to pay attention to the position.

  In this embodiment, the estimated voltage fluctuation amount is the system maximum voltage error Vemax. By using the system maximum voltage error Vemax, it is possible to calculate the magnitude of the deviation between the maximum voltage profile and the minimum voltage profile with respect to the first voltage profile. Note that the estimated voltage fluctuation amount may be the width W or the like. By using the width W, the magnitude of the difference between the maximum voltage profile and the minimum voltage profile can be calculated.

  According to the voltage fluctuation amount estimation process described above, an estimated voltage fluctuation amount at an arbitrary position in the target power system can be calculated. Further, the system maximum voltage error Vemax can be calculated as the maximum error that can be included in the voltage obtained by the power flow calculation based on the input first load center point position.

  Next, the arrangement determination process by the arrangement determination unit 14 will be described.

  In the arrangement determination process, the arrangement determination unit 14 determines the number of installed measurement devices and the installation position so that the estimated voltage fluctuation amount calculated by the voltage fluctuation amount estimation unit 13 is equal to or less than the target voltage fluctuation amount. In addition, as the estimated voltage fluctuation amount, the user may specify in advance either the system maximum voltage error Vemax or the width W, and the placement determination unit 14 may recognize it.

  FIG. 16 shows an arrangement determination process.

  First, the arrangement determining unit 14 compares the target voltage fluctuation amount included in the condition input data 11 read by the input unit 12 with the estimated voltage fluctuation amount (S131). As a result of the comparison, if the estimated voltage fluctuation amount is equal to or less than the target voltage fluctuation amount (S131: YES), the arrangement determining unit 14 advances the process to S133; otherwise (S131: NO), the arrangement determining unit 14 The process proceeds to S132. When the target voltage fluctuation amount is specified together with a plurality of points of the target power system as in the above-described variation example of the fluctuation condition data, the arrangement determining unit 14 estimates all the points specified in the fluctuation condition data. The voltage fluctuation amount is calculated, and if all of the estimated voltage fluctuation amounts are equal to or less than the corresponding target voltage fluctuation amount, the process proceeds to S133, and if at least one point is not, the process proceeds to S132.

  If it is determined NO in S131, the placement determination unit 14 increases the number of additional installations by one to create power state data, and the voltage fluctuation amount estimation unit 13 uses the power state data to determine the voltage fluctuation described above. By performing the amount estimation process, a new estimated voltage fluctuation amount is calculated (S132).

  Here, the process of the arrangement determining unit 14 when the additional installed number is increased by one will be described.

  As described above, in the initial state before the measurement device arrangement plan support process, one measurement device is already installed in the node 20a. The arrangement determination unit 14 provisionally determines an additional installation position that is a point where one measuring device is added. In the present embodiment, the arrangement determining unit 14 temporarily determines the vicinity of the intermediate point of the section having the longest travel length as the additional installation position in the target power system. The span length here is the distance from the start point node of the section to the end point node of the section. In the present embodiment, the section having the longest length in the target power system is a section from the node 20a to the node 20f, and therefore, the additional installation position is the node 20d that is the intermediate point. According to the node equipment data described above, the node 20d can be installed because the measuring device installation possible flag 32 is “1”. If the node at the midpoint cannot install the measuring device, the arrangement determining unit 14 may set another installable position closest to the midpoint as the additional installation position. Or the arrangement | positioning determination part 14 may select the node near an intermediate point as an additional installation position, without considering the measuring device installation possible flag 32 at this time. In this way, the arrangement determining unit 14 temporarily determines the node 20d as the additional installation position.

  FIG. 17 shows an example of branch state data when a measuring device is added. The placement determination unit 14 updates the branch state data in the power state data by provisionally determining the additional installation position. As shown in this figure, the arrangement determining unit 14 adds information on the branch 21d corresponding to the additional installation position in the branch state data. Thereby, the branch 21d is newly measured.

  The arrangement determining unit 14 divides one section 700 before provisional determination into two sections 701 and 702. The division point is a node 20d that is a provisionally determined additional installation position.

  FIG. 18 shows an example of load center point node data when a measuring device is added. The placement determination unit 14 updates the load center point node data in the power state data by provisional determination of the additional installation position. As shown in this figure, the placement determination unit 14 deletes the information of the section 700 before provisional determination in the load center point node data, and newly adds the information of the section 701 and the information of the section 702. Here, the load center point of the section 701 is the node 20c, and the load center point of the section 702 is the node 20e. Further, the arrangement determining unit 14 calculates the load active power 74 and the load reactive power 75 at each load center point.

  Here, a case where load center point distribution data is used instead of load center point node data will be described.

  FIG. 19 shows an example of load center point distribution data when a measuring device is added. The arrangement determining unit 14 updates the load center point distribution data in the power state data by provisionally determining the additional installation position. As shown in this figure, the placement determination unit 14 deletes the information of the section 700 before provisional determination in the load center point distribution data, and newly adds the information of the section 701 and the information of the section 702. Further, the arrangement determining unit 14 calculates the center distance 83, the standard deviation 84, the load active power 85, and the load reactive power 86 of the load center point for each of the sections 701 and 702.

  In S132 described above, the voltage fluctuation amount estimation unit 13 performs voltage fluctuation amount estimation processing using the power state data updated by adding the measurement device, and again performs the first voltage profile, the second voltage profile, and the third voltage profile. The voltage profile is calculated.

  FIG. 20 shows an example of the first voltage profile, the second voltage profile, and the third voltage profile when a measuring device is added. The width W is smaller than before the measurement device is added. This is because the measurement device is added and the target power system is divided into two sections, so that the number of load center points increases and the range in which the load center point positions are distributed becomes narrower, and accordingly, Vmax 115b. This is because the difference between V min and Vmin 115c is reduced. Further, the estimated voltage fluctuation amount is also reduced. The voltage fluctuation amount estimation unit 13 calculates the estimated voltage fluctuation amount when one measuring device is added using the first voltage profile 116a, the second voltage profile 116b, and the third voltage profile 116c. In each of the first voltage profile 116a, the second voltage profile 116b, and the third voltage profile 116c, two load center points are set in the target power system, and the slope of the voltage profile changes at these two load center points.

  In S131 again, the arrangement determining unit 14 determines whether the estimated voltage fluctuation amount is equal to or less than a predetermined target voltage fluctuation amount. If the determination result in S131 is YES, the arrangement determining unit 14 advances the process to S133. Otherwise (if the determination result in S131 is NO), the placement determination unit 14 proceeds the process again to S132, further increases the number of additional installed units, and calculates the estimated voltage fluctuation amount. Here, the arrangement determination unit 14 does not hold the additional installation position (node 20d) provisionally determined last time, but installs the measurement apparatus in the initial state of the measurement apparatus arrangement plan support process (only the node 20a is installed). In addition, two additional measuring devices are added. Specifically, the arrangement determining unit 14 arranges two measuring devices at equal intervals in the section having the longest length in the target power system. That is, the arrangement determining unit 14 arranges the measuring devices at the nodes 20c and 20e corresponding to the points 1/3 and 2/3 of the length of the section. As described above, when N measuring devices are added to a certain section, the arrangement determining unit 14 arranges the distances in the section at positions where the distance is equally divided by (N + 1).

  There is a division method that divides a section from a viewpoint other than the distance when dividing the section equally. For example, the arrangement determining unit 14 may divide so that the impedance (resistance, reactance, etc.) of each section after the division is equalized. In the example of the branch facility data described above, it means that the distance, the resistance (R), and the reactance (X) are the same in all branches, that is, the electric wire type of each branch is the same. However, the type of electric wire may differ depending on the branch. In that case, the impedance is different even if the distance is the same. Therefore, the dividing point when equalizing the impedance may be different from the dividing point when equalizing the distance.

  As another division method, the target power system may be divided so as to equalize the amount of voltage drop in each section after division. The amount of voltage drop varies depending on the passing current I and the impedance of the branch, as shown by the equation (1). For this reason, the dividing point in the case of equalizing the voltage drop amount may be different from the dividing point by each of the above dividing methods.

  As another division method, the target power system may be divided so as to equalize the customer load capacity of each section after division. The customer load capacity is the power capacity (maximum power) with which the customer contracts with the power company. When this division method is used, the division points may be different from the division points obtained by the respective division methods.

  As another division method, the target power system may be divided so that parameters based on at least one of the above-described distance, impedance, voltage drop amount, and customer load amount are equalized.

  As described above, the arrangement determining unit 14 repeats S132 until it is determined YES in S131. When the number of executions of the process of S132 reaches a predetermined upper limit number (upper limit number of additional measuring devices), the arrangement determination unit 14 outputs this fact to a log file and ends this flow. May be. As a result, it is possible to prevent the arrangement determination process from extending for a long time.

  In S131, when the estimated voltage fluctuation amount is equal to or less than the target voltage fluctuation amount (in the case of YES), the arrangement determining unit 14 advances the process to S133, and determines the additional installation number and the additional installation position at this time as the calculation result. Then, output data 15 indicating the determined additional installation number and additional installation position is output, and this flow is terminated. For example, the arrangement determining unit 14 displays the output data 15 on the display device.

  According to the operation of the arrangement determination unit 14 described above, it is possible to determine the additional installation number and the additional installation position of the measuring device. Further, by determining whether or not the estimated voltage fluctuation amount satisfies the fluctuation condition, it is possible to determine whether or not a desired measurement accuracy can be obtained based on the determined additional installation number and additional installation position. When the estimated voltage fluctuation amount does not satisfy the fluctuation condition, the estimated voltage fluctuation amount can be changed by changing the additional installation number and the additional installation position. In particular, the estimated voltage fluctuation amount can be reduced by adding a measuring device. The desired measurement accuracy can be obtained by changing the additional installation number and the additional installation position until the estimated voltage fluctuation amount satisfies the fluctuation condition. Further, by determining the installation positions of the plurality of measurement devices so that the predetermined parameters based on the installation positions of the plurality of measurement devices are equal, it is possible to optimally arrange the predetermined parameters.

  Calculate the estimated voltage fluctuation amount indicating the maximum error in the target power system, and compare it with the target voltage fluctuation amount set for the target power system. It can be determined whether or not measurement accuracy can be obtained. In addition, for each node specified in the target power system, the estimated voltage fluctuation amount indicating the magnitude of the error is calculated, and compared with the target voltage fluctuation amount set for the node, It can be determined whether or not a desired measurement accuracy can be obtained by the additional installation position.

  FIG. 21 shows an example of the output data 15 of the first embodiment. The output data 15 indicates the additional installation number and the additional installation position determined by the arrangement determination unit 14. Here, the arrangement determining unit 14 selects an additional installation position from among a plurality of nodes in the target power system. The output data 15 includes a measurement device ID 180 indicating an additional measurement device and an installation node ID 181 indicating a node of an additional installation position of the additional measurement device for each additional measurement device. Here, the additional installation number is two. The additional installation positions 1701 and 1702 are nodes 20b and 20e, respectively.

  FIG. 22 shows a modification of the output data 15 of the first embodiment. In this case, the arrangement determining unit 14 determines the additional installation position as an arbitrary position, not limited to the node. The output data 15 includes, for each additional measurement device, a measurement device ID 190 indicating the additional measurement device, an installation branch ID 191 indicating a branch including the additional installation position of the additional measurement device, and the additional installation position from the start node of the branch. Distance 192. Here, the additional installation number is two. Further, the additional installation positions 1701 and 1702 are represented by distances from the start node of the branches 20b and 20e, respectively.

  The arrangement determining unit 14 may output the first voltage profile, the second voltage profile, the third voltage profile, and the like as the output data 14. Further, the arrangement determining unit 14 may display the output data 14 on a display device.

  According to the present embodiment, it is possible to efficiently determine the number of additional installed measurement devices and the additional installation position so that the estimated voltage fluctuation amount of the target power system is equal to or less than the target voltage fluctuation amount.

  As an example of the arrangement planning support apparatus of the present invention, the additional installation number and the additional installation position of the measuring apparatus to be arranged in the target power system are determined, and the additional installation number and the additional installation position are determined in consideration of actual installation conditions. A measuring device arrangement plan support device that can be corrected will be described.

  FIG. 23 illustrates a configuration of a measurement device arrangement plan support device according to the second embodiment.

  In the present embodiment, the portions denoted by the same reference numerals as the portions shown in the first embodiment are the portions having the same functions as the portions shown in the first embodiment, and the description thereof is omitted. In addition to the configuration of the measurement device arrangement plan support device 1, the measurement device arrangement plan support device 2 of this embodiment includes an arrangement correction unit 16.

  Next, the outline | summary of operation | movement of the measuring device arrangement | positioning plan assistance apparatus 2 is demonstrated. Similarly to the first embodiment, the voltage fluctuation amount estimation unit 13 calculates the estimated voltage fluctuation amount by performing the voltage fluctuation amount estimation processing. And the arrangement | positioning determination part 14 provisionally determines an additional installation number and an additional installation position so that an estimated voltage fluctuation amount may satisfy | fill fluctuation conditions by performing an arrangement | positioning determination process.

  Furthermore, the arrangement correction unit 16 acquires additional installation data including the additional installation number and the additional installation position based on the input from the user of the measurement apparatus arrangement plan support apparatus 2 in order to consider actual installation conditions. And the arrangement | positioning determination part 14 corrects an additional installation number and an additional installation position so that the estimated voltage fluctuation amount based on additional installation data satisfy | fills a fluctuation condition.

  Here, the arrangement correction processing for correcting the additional installation number and the additional installation position by the arrangement correction unit 16 and the arrangement determination unit 14 will be described.

  It is assumed that the output data 15 indicating the additional installation number and the additional installation position is displayed by the same arrangement determination process as in the first embodiment.

  FIG. 24 shows an example of the output data 15 of the second embodiment. Here, the arrangement determining unit 14 selects an additional installation position from among a plurality of nodes in the target power system. The number of additional installations here is one. Further, each additional installation position 1701 is the node 20d.

  FIG. 25 shows a modification of the output data 15 of the second embodiment. In this case, the arrangement determining unit 14 determines the additional installation position as an arbitrary position, not limited to the node. The number of additional installations here is one. The additional installation position 1701 is represented by a distance from the start point node of the branch 20d.

  Here, from the viewpoint of actual installation conditions, it is assumed that it is difficult to install the measurement device at the additional installation position temporarily determined by the arrangement determination process. The reason for this is, for example, that when a measuring device is installed at this additional installation position, when it interferes spatially with other equipment that has already been installed, the installation cost is large compared to a general location. It is done.

  FIG. 26 shows the arrangement correction process.

  The arrangement correcting unit 16 acquires additional installation data including the additional installation number and the additional installation position (S230). For example, the arrangement correction unit 16 displays output data 15 using a GUI (Graphical User Interface), receives input of correction of the output data 15 by the user, and acquires the corrected output data 15 as additional installation data. . Here, for example, the user corrects the additional installation position in the displayed output data 15.

  Next, the voltage fluctuation amount estimation unit 13 performs a voltage fluctuation amount estimation process similar to that of the first embodiment using the acquired additional installation data (S231). As a result, a new estimated voltage fluctuation amount based on the additional installation data is calculated.

  Next, the arrangement determining unit 14 compares the target voltage fluctuation amount included in the condition input data 11 with the estimated voltage fluctuation amount calculated in S231 (S232). As a result of the comparison, if the estimated voltage fluctuation amount is equal to or less than the target voltage fluctuation amount (in the case of YES), the arrangement determining unit 14 advances the process to S234; otherwise (in the case of NO), the arrangement determining unit 14 , The process proceeds to S233.

  If it determines with NO by S232, the arrangement | positioning determination part 14 will correct additional installation data (S233). Here, the arrangement determining unit 14 increases the additional installed number by one. In addition, the arrangement determination unit 14 may correct the additional installation position. As a method for correcting the additional installation position, for example, the additional installation position may be moved to a node adjacent in a predetermined direction, or may be moved in a predetermined direction by a predetermined distance. And the voltage fluctuation amount estimation part 13 returns a process to S231, and performs a voltage fluctuation amount estimation process using the corrected additional installation data. Thus, a new estimated voltage fluctuation amount based on the corrected additional installation data is calculated.

  And the arrangement | positioning determination part 14 returns a process to S232, and determines whether an estimated voltage fluctuation amount becomes below a target voltage fluctuation amount. In the case of YES, the arrangement determining unit 14 advances the process to S234. Otherwise (in the case of NO), the arrangement determination unit 14 advances the process to S233 again, further corrects the provisional additional data, and the voltage variation estimation unit 13 performs the voltage variation estimation process.

  In this manner, the arrangement determining unit 14 repeats S231, S232, and S233 until it is determined YES in S232. Note that when the number of executions of the process of S233 reaches a predetermined upper limit number, the arrangement determination unit 14 may output this fact to a log file and terminate this flow.

  In S232, when the estimated voltage fluctuation amount becomes equal to or less than the target voltage fluctuation amount (in the case of YES), the arrangement determining unit 14 advances the processing to S234, and determines the additional installation number and the additional installation position at this time as the calculation result. Then, output data 15 indicating the determined additional installation number and additional installation position is output, and this flow is terminated. For example, the arrangement determining unit 14 displays the output data 15 on the display device.

  Note that each of the output data 15 and the additional installation data may include the installation position of the measurement apparatus already installed in the power system in addition to the installation position of the additional measurement apparatus.

  According to the present embodiment, the correction of the user with respect to the additional installation number and the additional installation position temporarily determined by the arrangement determination process is accepted, and the estimated voltage fluctuation amount based on the corrected additional installation number and the additional installation position satisfies the fluctuation condition. It can be determined whether or not. Furthermore, the estimated voltage fluctuation amount based on the corrected additional installation number and the additional installation position can be re-corrected so as to satisfy the fluctuation condition.

  By applying the measurement device arrangement plan support process of each embodiment described above to all the power systems under the jurisdiction of the power company, it is possible to estimate the number of additional installations for all the power systems. When the number of power systems is large, it is considered that a great deal of labor is required for setting power status data. Therefore, these power systems may be classified into several model systems. In this case, the number of power systems belonging to each model system is calculated. Then, the number of additional installations is determined by performing the measurement device arrangement plan support process for each model system, the number of power systems belonging to each model system is multiplied, and integration is performed over all model systems. It is possible to efficiently estimate the number of additional installations in all power systems under the jurisdiction of the company. The model system may be classified by distance, or may be classified by the type of customer such as a factory or household belonging to the region.

Here, as a comparative example, a method will be described in which errors are evaluated for all combinations of candidate points of the installation position of the measurement apparatus as in Patent Document 1 without applying the present invention. For example, consider a combination in the case where there are n candidate points for the installation position of the measuring device in the target power system. At this time, the combination in the case of arranging one unit is _n C _one , the combination in the case of arranging two units is _n C ₁ , and so on. Therefore, the combination in the case of arranging m units (1 ≦ m ≦ n) Can be expressed as _n C _m ways. Therefore, the total combination f (n) when there are n candidate points is expressed by the following equation.

  When the number n of candidate points is 20, there are about 1 million combinations, when n is 50, the combinations are 7 × 1013 (streets), and when n is 100, the combinations are 7 × 1020 (streets). When power systems are targeted, the installation of measuring devices is often performed near major equipment such as generators, transformers, and switches, or some monitored locations that are deemed necessary for system operation. In many cases, the number of position candidate points exceeds 20. Considering the calculation time at this time, it is difficult to obtain the optimum solution for the installation position of the measuring device.

  On the other hand, according to each embodiment of the present invention, the amount of fluctuation of the voltage in the target power system is estimated, and a measuring device is added until the estimated amount of fluctuation satisfies the fluctuation condition. The amount of calculation can be reduced.

  Terms used in the present invention will be described. The arrangement plan support apparatus corresponds to the measurement apparatus arrangement plan support apparatuses 1 and 2. The calculation unit corresponds to the voltage fluctuation amount estimation unit 13, the arrangement determination unit 14, the arrangement correction unit 16, and the like. The fluctuation amount corresponds to the estimated voltage fluctuation amount and the like. The fluctuation amount threshold corresponds to a target voltage fluctuation amount and the like.

  The present invention is not limited to the above embodiments, and can be modified in various other forms without departing from the spirit of the present invention.

1: measurement device arrangement plan support device 2: measurement device arrangement plan support device 10: power system data 11: condition input data 12: input unit 13: voltage fluctuation amount estimation unit 14: arrangement determination unit 15: output data 16: arrangement correction Part

Claims (14)

A storage unit for storing power system data indicating the arrangement of a measuring device including equipment in the power system and a sensor built-in switch, and power state data indicating a transmission power to the power system and a load in the power system;
Based on the power system data and the power state data, a calculation unit that performs a calculation for determining the arrangement;
With
The calculation is
A plurality of load center point positions according to a plurality of load center point conditions as load center points in the power system are determined using the power system data and the power state data,
As the voltage distribution in the power system, a plurality of voltage distributions respectively based on the plurality of load center point positions are calculated using the power system data and the power state data,
Estimating a fluctuation amount indicating a magnitude of voltage fluctuation between the plurality of voltage distributions;
Determining whether the variation amount satisfies a predetermined variation condition;
Arrangement planning support device for sensor built-in switch. When it is determined that the variation amount does not satisfy the variation condition, the calculation unit changes the arrangement and performs the calculation based on the changed arrangement.
The arrangement plan support apparatus according to claim 1. The calculation unit repeats the change and the calculation until it is determined that the variation amount satisfies the variation condition.
The arrangement plan support apparatus according to claim 2. The calculation unit performs the change by increasing the number of installed measuring devices.
The arrangement plan support apparatus according to claim 3. The calculation unit performs the change by determining each installation position of the plurality of measurement devices so that a predetermined parameter based on each installation position of the plurality of measurement devices due to the increase becomes equal.
The arrangement plan support apparatus according to claim 4. The parameters for a specific measuring device include the distance to the measuring device adjacent to the downstream side of the specific measuring device, the impedance of the section, the amount of voltage drop in the section, and the consumer load capacity in the section. A value based on at least one of
The arrangement plan support apparatus according to claim 5. The calculation unit calculates each of the plurality of voltage distributions by power flow calculation or state estimation.
The arrangement plan support apparatus according to claim 6. The calculation unit corrects the arrangement of the measurement device when it is determined that the fluctuation amount satisfies the fluctuation condition based on an input from a user, performs the calculation based on the corrected arrangement, Determining whether a variation amount based on the modified arrangement satisfies the variation condition;
The arrangement plan support apparatus according to claim 7. When it is determined that the variation amount based on the modified arrangement does not satisfy the variation condition, the calculation unit recorrects the corrected arrangement and performs the calculation based on the recorrected arrangement. ,
The arrangement plan support apparatus according to claim 8. The power status data indicates a first load center point position in the section,
The calculation unit determines a position having the smallest voltage drop among a plurality of positions in the section indicated in the power system data as a second load center point position, and the voltage drop among the plurality of positions. Is determined as the third load center point position , and the first voltage distribution and the second voltage distribution are determined based on the first load center point, the second load center point, and the third load center point, respectively. And a third voltage distribution, and a maximum value of a deviation between the second voltage distribution and the third voltage distribution with respect to the first voltage distribution is estimated as the variation amount.
The arrangement plan support apparatus according to claim 9. The calculation unit determines a position having the smallest voltage drop among a plurality of positions in the section indicated in the power system data as a second load center point position, and the voltage drop among the plurality of positions. There determines the highest position as the third load center point position, based respectively on said third load center point and the second load center point, calculates a second voltage distribution and the third voltage distribution, the second A maximum value of a difference between two voltage distributions and the third voltage distribution is estimated as the amount of variation;
The arrangement plan support apparatus according to claim 9. The storage unit stores a variation amount threshold value that is a threshold value of the variation amount,
The arithmetic unit determines that the variation amount satisfies a variation condition when the variation amount is equal to or less than the variation amount threshold.
The arrangement plan support apparatus according to any one of claims 1 to 11. The power system data indicates a plurality of positions in the section,
The storage unit stores a plurality of variation amount thresholds respectively corresponding to the plurality of positions,
The calculation unit calculates the plurality of variation amounts at the plurality of positions as the variation amount, and when all of the plurality of variation amounts are equal to or less than the corresponding variation amount threshold values, the variation amount Is determined to satisfy the variation condition,
The arrangement plan support apparatus according to any one of claims 6 to 11. Storing power system data indicating the arrangement of a measuring device including equipment in the power system and a sensor built-in switch, and power state data indicating the output power to the power system and the load in the power system;
Based on the power system data and the power state data, an operation for determining the arrangement is performed.
Prepared
The calculation is
A plurality of load center point positions according to a plurality of load center point conditions as load center points in the power system are determined using the power system data and the power state data,
As the voltage distribution in the power system, a plurality of voltage distributions respectively based on the plurality of load center point positions are calculated using the power system data and the power state data,
Estimating a fluctuation amount indicating a magnitude of voltage fluctuation between the plurality of voltage distributions;
Determining whether the variation amount satisfies a predetermined variation condition;
A method for supporting the layout planning of switches with built-in sensors.

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