Information processing device, information processing method and information processing program

Abstract

To provide an information processing device which accurately estimates a state of a power system.SOLUTION: An information processing device comprises: a first acquisition section which acquires a first total value of active power and a second total value of reactive power of loads included in a power system; a second acquisition section for acquiring a model including a first node N01 corresponding to a feed-out point of the power system, a second node N02 corresponding to a predetermined point at a primary side of a transformer for distribution, a third node N03 corresponding to a predetermined point at a secondary side of the transformer for distribution, a fourth node N04 virtually collecting at least the loads included in the power system, a first branch B01 connecting the first and second nodes, a second branch B02 connecting the second and third nodes and a third branch B03 connecting the third and fourth nodes; and a first computation section for computing a position of a tap, which is capable of changing a voltage ratio between the primary side and the secondary side of the transformer for distribution, and a voltage of the third node in a case where the active power and the reactive power of the fourth node are the first total value and the second total value.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an information processing device, an information processing method, and an information processing program. [Background technology]

[0002] There are known techniques for estimating the state of a distribution line in a power system. For example, Patent Document 1 discloses a technique for estimating the state of a plurality of distribution lines on the secondary side of a distribution transformer that uses a line voltage drop compensation method and is installed in a substation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6132994 Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, as control methods for a distribution transformer, a program control method and a line drop compensation (LDC) method are known.

[0005] The program control method is a method for controlling the voltage at the upstream end of multiple distribution lines to a predetermined value according to the time of day, while the LDC method is a method for controlling the voltage at a predetermined point on the secondary side of a distribution transformer to a predetermined value according to the load state of the power system.

[0006] In recent years, the large amount of power generation equipment, such as solar power generation equipment connected to distribution lines, has been introduced, and the advantages of using the program control method have diminished, leading to an increase in the use of the LDC method.

[0007] However, with the LDC method, it is more difficult to accurately grasp the voltage at the upstream end of the distribution line than with the program control method.

[0008] In the invention described in Patent Document 1, the accuracy of the voltage at the upstream end of the power distribution line is not taken into consideration, so there is a risk that the accuracy of calculation of the state of the power distribution line may deteriorate.

[0009] The present invention has been made in consideration of the above problems, and has an object to provide an information processing device capable of estimating the state of a power grid with high accuracy. [Means for solving the problem]

[0010] One invention for achieving the above object is an information processing device for calculating a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines having one end connected to the secondary side of the distribution transformer, and a plurality of loads connected to each of the plurality of distribution lines, the information processing device including a first acquisition unit for acquiring a first total value of active power and a second total value of reactive power of the loads included in the power system, a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, a predetermined point on the secondary side of the distribution transformer, and a first acquisition unit for acquiring a first total value of active power and a second total value of reactive power of the loads included in the power system, a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, and a predetermined point on the secondary side of the distribution transformer. a second acquisition unit that acquires a model including a third node corresponding to at least one of the loads included in the power system, a fourth node that virtually groups together at least the loads included in the power system, a first branch connecting the first and second nodes, a second branch connecting the second and third nodes, and a third branch connecting the third and fourth nodes; and a first calculation unit that calculates the tap position and the voltage of the third node when the active power and reactive power of the fourth node are the first and second sum values, respectively, based on the model and system information indicating components of the power system and electrical characteristics of the components.

[0011] Also, an information processing method for calculating a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines having one end connected to the secondary side of the distribution transformer, and a plurality of loads connected to each of the plurality of distribution lines, the information processing method including the steps of: acquiring a first sum of active power and a second sum of reactive power of the loads included in the power system; and determining a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, and a predetermined point on the secondary side of the distribution transformer. and calculating, based on the model and system information indicating components of the power system and electrical characteristics of the components, a position of the tap and a voltage of the third node when the active power and reactive power of the fourth node are the first and second sums, respectively.

[0012] Also, an information processing program for calculating a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines having one end connected to the secondary side of the distribution transformer, and a plurality of loads connected to each of the plurality of distribution lines, the information processing program being stored in an information processing device, the information processing program including a first acquisition unit that acquires a first total value of active power and a second total value of reactive power of the loads included in the power system, a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, a third node corresponding to a predetermined point on the secondary side of the distribution transformer, and a fourth node corresponding to a predetermined point on the secondary side of the distribution transformer. a second acquisition unit that acquires a model including a third node corresponding to the first node, a fourth node virtually collecting the loads included in the power system, a first branch connecting the first and second nodes, a second branch connecting the second and third nodes, and a third branch connecting the third and fourth nodes, and a first calculation unit that calculates the tap position and the voltage of the third node when the active power and reactive power of the fourth node are the first and second sums, respectively, based on the model and system information indicating components of the power system and electrical characteristics of the components. Other features of the present invention will become apparent from the description of this specification. Effect of the Invention

[0013] According to the present invention, it is possible to provide an information processing device capable of estimating the state of a power grid with high accuracy. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing an example of a power system 1 whose state is estimated by an information processing device 2. FIG. [Diagram 2] 2 is a diagram illustrating a hardware configuration of an information processing device 2. FIG. [Diagram 3] FIG. 2 is a diagram showing functional blocks of an information processing device 2. [Figure 4] FIG. 2 is a diagram for explaining a system model M0. [Diagram 5] 1 is a diagram illustrating a total value P of active power and a total value Q of reactive power. FIG. [Figure 6] 11 is a diagram for explaining calculations by a first calculation unit 213. FIG. [Figure 7] 13 is a diagram showing the results of calculation by the first calculation unit 213. FIG. [Figure 8] 13 is a diagram for explaining calculations performed by a second calculation unit 214. FIG. [Figure 9] 13 is a diagram for explaining calculations performed by a second calculation unit 214. FIG. [Figure 10] 10 is a flowchart illustrating a process performed by information processing device 2 until the result of power flow calculation is displayed. [Figure 11] 10 is a flowchart illustrating a process performed by information processing device 2 until the result of power flow calculation is displayed. [Figure 12] 10 is a diagram for explaining settings for power flow calculation by a first calculation unit 213. FIG. [Figure 13] 10 is a diagram for explaining settings for power flow calculation by a second calculation unit 214. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] At least the following points will become apparent from the description of this specification and the accompanying drawings.

[0016] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same or equivalent components, members, etc. shown in each drawing are designated by the same reference numerals, and duplicated descriptions will be omitted as appropriate.

[0017] == Implementation form == <<Power system 1>> 1 is a diagram showing an example of a power system 1 whose state is estimated by an information processing device 2 described later. The power system 1 includes a plurality of distribution transformers 10, a plurality of distribution lines 11, circuit breakers FCBs installed in each of the plurality of distribution lines 11, a plurality of loads L, and a plurality of power generation facilities.

[0018] [Distribution Transformer 10] The distribution transformer 10 is installed in a distribution substation, transforms a voltage supplied from a transmission line 12, and outputs a voltage of 6.6 kV to a plurality of distribution lines 11. In this embodiment, two distribution transformers 101 and 102 are installed in the distribution substation.

[0019] In this embodiment, a line drop compensation (LDC) method is adopted as a control method for the distribution transformer 10. The distribution transformer 10 is capable of changing the transformation ratio between the primary side and the secondary side by a tap using the LDC method.

[0020] [Power distribution line 11] The power distribution lines 11 start from the power distribution transformer 10 and are connected radially to the power distribution transformer 10. The power distribution lines 11 are three-phase AC power distribution lines. One end of each of the power distribution lines 11 is connected to the secondary side of the power distribution transformer 10.

[0021] In this embodiment, one end of each of four distribution lines 111-114 is connected to the secondary side of distribution transformer 101. Also, one end of each of three distribution lines 115-117 is connected to the secondary side of distribution transformer 102.

[0022] [Circuit breaker FCB] The circuit breaker FCB is installed in each of the multiple distribution lines 11. A sensor capable of periodically measuring at least active power and reactive power, which are measured at the installation point, is installed near the load side of the circuit breaker FCB.

[0023] In each of the multiple distribution lines 11, a consumer load is installed downstream of the circuit breaker FCB. A sensor installed upstream of the load in each of the multiple distribution lines 11, such as the sensor of the circuit breaker FCB in this embodiment, corresponds to a "first sensor."

[0024] [load] The load L is a load of a consumer, and consumes the power supplied through the power distribution line 11. A plurality of loads are connected to each of the plurality of power distribution lines. In FIG. 1, a node N A 1 shows only one load L connected to the distribution line 111 via a pole transformer or the like (not shown) installed on a utility pole installed at a location on the distribution line 111, and other loads are omitted.

[0025] [Power generation facilities] The power generation facility G is a power generation facility of a consumer. The power generation facility G is, for example, a photovoltaic power generation facility PV. A plurality of power generation facilities are connected to each of a plurality of distribution lines. In FIG. 1, a node N B 1 shows only one photovoltaic power generation facility PV connected to a power distribution line 111 via a pole-mounted transformer or the like (not shown) installed on a utility pole installed in a power distribution line 111, and the other power generation facilities G are omitted.

[0026] <<Information processing device 2>> The information processing device 2 is a device that executes calculations for estimating the above-mentioned state of the power system 1. Although details will be described later, the information processing device 2 is a device that can calculate the state of the power system 1 with high accuracy by calculating the voltages at predetermined points B1, B2 (FIG. 1) on the secondary sides of the distribution transformers 101, 102 with high accuracy.

[0027] The hardware configuration of the information processing device 2, various databases, and functional blocks of the information processing device 2 will be described below in that order.

[0028] <Hardware configuration of information processing device 2> 2 is a diagram illustrating a hardware configuration of the information processing device 2 of the present embodiment. The information processing device 2 is a computer having a CPU (Central Processing Unit) 200, a memory 201, a communication device 202, a storage device 203, an input device 204, an output device 205, and a recording medium reading device 206.

[0029] [CPU200] The CPU 200 executes information processing programs stored in the memory 201 or the storage device 203 to realize various functions of the information processing device 2.

[0030] [Memory 201] The memory 201 is, for example, a RAM (Random-Access Memory) and is used as a temporary storage area for various programs, data, and the like.

[0031] [Communication device 202] The communication device 202 exchanges various programs and data with other computers via the communication network 4 .

[0032] [Storage device 203] The storage device 203 is a non-transitory (eg, non-volatile) storage device that stores various data to be executed or processed by the CPU 200.

[0033] The storage device 203 stores various databases such as a system information DB 220, a measurement value DB 221, and a calculation value DB 222. These will be described in detail later.

[0034] [Input device 204] The input device 204 is a device that accepts commands and data input by a user, and includes an input interface such as a keyboard and a touch sensor that detects a touch position on a touch panel display.

[0035] [Output Device 205] The output device 205 is, for example, a display or a printer.

[0036] [Recording medium reader 206] The recording medium reader 206 reads various data such as an information processing program recorded on a recording medium 3 such as a memory card, an optical disk, or a compact disk, and stores the data in the storage device 203 .

[0037] <Various databases> As described above, various databases such as the system information DB 220, the measurement value DB 221, and the calculation value DB 222 are stored in the storage device 203. Each of these will be described below.

[0038] [Strain information DB220] The system information DB 220 is a database relating to system information of the power system 1. The system information is information indicating components of the power system 1 and electrical characteristics of the components.

[0039] The components of the power system 1 include, for example, identifiers of each of a plurality of nodes in a section whose state is to be estimated, identifiers of nodes to which each of the plurality of nodes is connected, etc. The electrical characteristics of the components include the impedance of the distribution line 11 between adjacent nodes, etc.

[0040] For example, for the distribution line 111 in FIG. A+1 The identifier of node N is A+1. A+1 The identifier of the node to which A The identifier (A) of each node is the same as that of the neighboring nodes N A and node N A+1 The impedance and the like of the distribution line 111 between these nodes are stored in the system information DB 220. The same applies to the other nodes.

[0041] [Measurement value DB221] The measurement value DB 221 is a database that accumulates the measurement values ​​of active power and reactive power measured by the sensors of the circuit breakers FCB.

[0042] The data stored in the measurement value DB221 may be pre-stored in the memory device 203, or may be updated at any time by the CPU 200 acquiring measurement values ​​from the sensor of the circuit breaker FCB via the communication device 202 and writing the acquired measurement values ​​to the measurement value DB221.

[0043] [Calculated value DB222] The calculated value DB 222 is a database that records the results of the power flow calculation and the voltages of the slack nodes calculated by the information processing device 2. The output unit 215, which will be described later, outputs the results of the power flow calculation, and the calculation results are stored in the calculated value DB 222.

[0044] <Function blocks of information processing device 2> 3 is a diagram showing functional blocks of the information processing device 2. The information processing device 2 includes a generation unit 210, a first acquisition unit 211, a second acquisition unit 212, a first calculation unit 213, a second calculation unit 214, and an output unit 215.

[0045] [Generation unit 210] The generating unit 210 generates a system model M0 (corresponding to a "model"). The system model M0 is a model that simulates a section of the power system 1 that includes a sending point A (FIG. 1) of the power system 1, one distribution transformer 10, and a plurality of distribution lines 11 connected to the distribution transformer 10.

[0046] In the following description, the system model M0 is a model that simulates a section of the power system 1 including distribution transformer 101 out of distribution transformers 10 in the power system 1 of Figure 1 and four distribution lines 111-114 connected to distribution transformer 101.

[0047] FIG. 4 is a diagram for explaining the system model M0. The system model M0 is a node N 01 ~N 04 , Branch B 01 ~B 03 It is a node-branch model that includes

[0048] Node N 01 (corresponding to "first node") is a node corresponding to the sending point A of the power system 1 (FIG. 1). Also, node N 01 is the voltage reference node in the system model M0.

[0049] In addition, in a model that simulates the power system 1 or a part of its sections, such as the system model M0 and the system models M1 to M4 described later, a node that is a reference for voltage is called a "slack node." That is, the node N 01 is a slack node in the system model M0.

[0050] Node N 02 (corresponding to the "second node") is a node corresponding to a predetermined point on the primary side of the distribution transformer 101. There is no particular limitation on the predetermined point on the primary side. Node N 02 is, for example, a connection point between the power transmission line 12 and the distribution transformer 101.

[0051] Node N 03 (corresponding to the "third node") is a node corresponding to a predetermined point on the secondary side of the distribution transformer 101. The predetermined point on the secondary side may be any point upstream of the load of the consumer connected to the distribution line 11. 03 is, for example, a point a predetermined distance downstream from the distribution transformer 101.

[0052] Node N 04 (corresponding to the "fourth node") is a node that virtually aggregates at least the loads included in the power system 1. In this embodiment, the node N 04 is a node that virtually brings together the loads and the power generation facilities 1 included in the power system.

[0053] Branch B 01 (corresponding to the "first branch") is node N 01 and node N 02 Branch B is a branch that connects 02 (corresponding to the "second branch") is node N 02 and node N 03 Branch B is a branch that connects 03 (corresponding to the "third branch") is node N 03 and node N 04 This is a branch that connects

[0054] [First acquisition part 211] The first acquisition unit 211 acquires a total value P of active power (corresponding to a “first total value”) and a total value Q of reactive power (corresponding to a “second total value”) of the loads included in the power system 1.

[0055] In the present embodiment, the first acquisition unit 211 acquires the total value of the active power measurement values ​​of the sensors of the circuit breakers FCBs of the multiple power distribution lines 11 as a total value P. Then, the first acquisition unit 211 acquires the total value of the reactive power measurement values ​​of the sensors of the circuit breakers FCBs of the multiple power distribution lines 11 as a total value Q.

[0056] 5 is a diagram illustrating the total active power value P and the total reactive power value P. In this embodiment, the first acquisition unit 211 first acquires active powers P1-P4 and reactive powers Q1-Q4 via the measurement value DB 221 from sensors of the circuit breakers FCBs installed in the four power distribution lines 111-114, respectively.

[0057] In this embodiment, it is assumed that the power loss in the power distribution line 11 is sufficiently small compared with the power consumption in the load of the consumer.

[0058] In such a case, for example, active power P1 is approximately equal to the total value of active power of the loads of multiple consumers connected to the distribution line 111. Also, reactive power Q1 is approximately equal to the total value of reactive power of the loads of multiple consumers connected to the distribution line 111. The same is true for active powers P2 to P4 and reactive powers Q2 to Q4.

[0059] Then, the first acquisition unit 211 acquires the sum of the active powers P1 to P4 (P1+P2+P3+P4) as the total active power value P. The first acquisition unit 211 further acquires the sum of the reactive powers Q1 to Q4 (Q1+Q2+Q3+Q4) as the total reactive power value Q.

[0060] Here, the total active power value P is approximately equal to the total active power value of the loads of the multiple consumers connected to the four distribution lines 111-114. Similarly, the total reactive power value Q is approximately equal to the total reactive power value of the loads of the multiple consumers connected to the distribution lines 111-114.

[0061] [Second acquisition part 212] The second acquisition unit 212 acquires the system model M0 generated by the generation unit 210. The system model M0 acquired by the second acquisition unit 212 is used in calculations by the first calculation unit 213, which will be described later.

[0062] [1st calculation section 213] The first calculation unit 213 calculates points B1 and B2 (FIG. 1) on the secondary side of the distribution transformer 10 before the second calculation unit 214, which will be described later, executes the power flow calculation.

[0063] Specifically, the first calculation unit 213 calculates the tap position of the distribution transformer 10 and the node N of the system model M0 based on the system model M0 (FIG. 4) and the system information. 03 At this time, the first calculation unit 213 calculates the voltage at node N 04 The calculation is performed for the case where the active power and reactive power are the total values ​​P and Q, respectively.

[0064] 6 is a diagram for explaining the calculation by the first calculation unit 213. As shown in FIG. 6, the first calculation unit 213 calculates the power consumption of the node N 04 The total value P of the active power (=P1+P2+P3+P4) and the total value Q of the reactive power (=Q1+Q2+Q3+Q4) acquired by the first acquisition unit 211 are set in

[0065] In this example, the total active power value P is 3000.0 kW, and the total reactive power value Q is 1300.0 kVar.

[0066] The first calculation unit 213 further calculates the slack node N 01, the sending voltage of the power system 1 is set to a predetermined value of 66 kV.

[0067] The first calculation unit 213 applies the above-mentioned setting values ​​to the system model M0, and calculates the tap position of the distribution transformer 101 and the node N 03 Calculate the voltage.

[0068] 7 is a diagram showing the result of the calculation by the first calculation unit 213. In this example, the node N 02 The voltage at node N is 66,000V. 03 The voltage at node N is 6,800V. 04 It is shown that a value of 6,699V was obtained by load flow calculation.

[0069] The node N obtained here 03 This voltage (6,800 V) is regarded as the voltage at a predetermined point A1 (FIG. 1) on the secondary side of the distribution transformer 101, and is used in the power flow calculation by the second calculation unit 214, which will be described later.

[0070] Detailed settings for the calculations performed by first calculation unit 213 will be described later using a flowchart.

[0071] [Second calculation section 214] The second calculation unit 214 executes power flow calculation for the target section. Here, the target section is a section of the power system 1 that includes at least one of the multiple distribution lines 11. In this embodiment, the target section is a section of the power system that includes one of the multiple distribution lines 11.

[0072] At this time, the second calculation unit 214 calculates the node N 03 The power flow calculation is performed by assuming the voltage at the upstream end of each of the multiple distribution lines 11.

[0073] 8 and 9 are diagrams for explaining the calculation by the second calculation unit 214. In Fig. 8, system models M1 to M4 are shown which respectively simulate the four distribution lines 111 to 114 connected to the distribution transformer 101 (Fig. 1).

[0074] The system models M1 to M4 are node-branch models corresponding to sections including the power distribution lines 111 to 114, respectively. In FIG. 8, the upstream end nodes N 11 ~N 41 Only the nodes are shown, other nodes are omitted.

[0075] In this example, the upstream node N 11 ~N 41 corresponds to point A1 (Figure 1) on the secondary side of the distribution transformer. Also, node N 11 ~N 41 are slack nodes in the system models M1 to M4, respectively. Node N 11 ~N 41 In the first calculation unit 213, the node N 03 The voltage is set at 6,800V.

[0076] In this embodiment, the second calculation unit 214 performs power flow calculation for each of the system models M1 to M4. That is, the second calculation unit 214 performs power flow calculation for each section including each of the four distribution lines 111 to 114, thereby completing the power flow calculation for the section including all of the four distribution lines 111 to 114.

[0077] In the following, a procedure in which the second calculation unit 214 performs the power flow calculation, particularly for the section K including the power distribution line 111, will be described with reference to FIG.

[0078] 9(a) is a diagram illustrating section K including a distribution line 111 connected to a distribution transformer 101 (FIG. 1). Section K includes utility poles 121-128, a pole transformer SVR, and consumer loads L1-L3 downstream of a circuit breaker FCB.

[0079] In this example, utility poles 121 to 128 are arranged in this order from the upstream side. A pole-mounted transformer SVR uses an LDC control method and is installed on utility pole 124. Consumer loads L1 to L3 are connected to utility poles 121, 123, and 126, respectively.

[0080] FIG. 9(b) is a diagram for explaining the details of a system model M1 that simulates a section K. The system model M1 is 11 ~N 19 Includes.

[0081] Node N 11 is the node corresponding to the sending point of section K. Also, node N 11 is a slack node in the system model M1 as described above, and is a node N 03 The voltage is set to 6,800V (Figure 7).

[0082] Node N 12 ~N 19 are nodes corresponding to utility poles 121 to 128, respectively, in this order.

[0083] When performing the power flow calculation, the second calculation unit 214 sets the initial values ​​of state variables (P0+jQ0 in FIG. 9, where P0 is active power and Q0 is reactive power).

[0084] Then, the second calculation unit 214 calculates the node N 11 ~N 19 That is, the second calculation unit 214 executes calculation of the system state quantity (active power, reactive power, voltage, etc.) of the node N 11 to the terminal node N 19 The system state quantities are calculated sequentially toward

[0085] Here, in this example, the terminal node N 19 Since no consumer load is connected to node N 19The second calculation unit 214 calculates the power (active power and reactive power) of the node N 19 Convergence is judged based on whether the absolute value of the error between the power calculation result and 0 (zero) is smaller than a predetermined judgment reference value.

[0086] Node N obtained by forward calculation 19 If the absolute value of the error in the power of node N is greater than a predetermined reference value (i.e., if the error has not converged), the second calculation unit 214 calculates the power of node N by the amount of the error. 11 Modify the state variable (P0+jQ0).

[0087] As described above, the second calculation unit 214 executes convergence calculation by repeating the calculation of the system state quantity to the correction of the state variables.

[0088] In the power flow calculation executed by the second calculation unit 214, the node N 11 Since the voltages are determined with high precision, the results of the power flow calculations are also highly accurate.

[0089] Then, the second calculation unit 214 performs similar power flow calculations for the sections including each of the other distribution lines 112-114.

[0090] Detailed settings for the calculations performed by second calculation unit 214 will be described later using a flowchart.

[0091] [Output section 215] The output unit 215 outputs the result of the power flow calculation calculated by the second calculation unit 214 via the output device 205 (FIG. 2) of the information processing device 2. The output device 305 shows the result of the calculation to the user by displaying the measurement result on a display device such as a liquid crystal monitor or by vocalizing the measurement result through an audio output device such as a speaker.

[0092] Moreover, the result of the power flow calculation calculated by second calculation unit 214 is stored in calculation value D222.

[0093] <<Processing until the results of load flow calculation are displayed>> The process performed by the information processing device 2 until the result of the power flow calculation is displayed will be described with reference to a flowchart.

[0094] In the following description, processing related to a section including the power distribution lines 111-114 connected to the secondary side of the distribution transformer 101 in the power system 1 shown in FIG.

[0095] Fig. 10 is a flowchart illustrating the process up to when the information processing device 2 displays the result of the power flow calculation. As shown in Fig. 10, this process includes steps S10 to S60.

[0096] Moreover, Fig. 11 is a flowchart for explaining the details of step S30 in Fig. 10. As shown in Fig. 10, step S30 includes steps S31 to S35.

[0097] First, in step S10, the generation unit 210 generates a system model M0 (FIG. 4) that simulates a section of the power system 1 that includes the distribution transformer 101 and the four distribution lines 111-114 connected to the distribution transformer 101.

[0098] Next, in step S20, the second acquisition unit 212 acquires the system model M0 generated in step S10.

[0099] Next, in step S30, the first calculation unit 213 calculates the voltage of a slack node to be used in the power flow calculation in the subsequent step S40. 03 The voltage used is as follows: Step S30 will be described in detail below.

[0100] When step S20 is completed, the process proceeds to step S31 shown in FIG. 11, where the first acquisition unit 211 acquires the total value of the loads (active power and reactive power) of the consumers connected to the four distribution lines 111-114.

[0101] In this embodiment, the first acquisition unit 211 first acquires active powers P1 to P4 and reactive powers Q1 to Q4 from the sensors of the circuit breakers FCB of each of the four distribution lines 111 to 114 via the measurement value DB 221 (FIG. 5).

[0102] Then, the first acquisition unit 211 determines the total value P of the active powers P1 to P4 as the active power of the loads of the consumers connected to the distribution lines 111 to 114. Furthermore, the first acquisition unit 211 determines the total value Q of the reactive powers Q1 to Q4 as the reactive power of the loads of the consumers connected to the distribution lines 111 to 114.

[0103] Next, in step S32, the first calculation unit 213 calculates the node N 04 The sum values ​​P and Q acquired in step S31 are set in (FIG. 6).

[0104] Next, in step S33, the first calculation unit 213 performs a power flow calculation for the system model M0. At this time, the first calculation unit 213 calculates the tap position and the node N 03 Calculate the voltage.

[0105] Fig. 12 is a diagram for explaining the settings of the power flow calculation by the first calculation unit 213 in step S33. The setting values ​​shown in Fig. 12 are applied to the system model M0.

[0106] FIG. 12(a) shows the slack node N 01 In this example, the feeder number, the node number, the reference voltage, and the reference phase angle are shown.

[0107] Here, the "feeder number" is a number for identifying the power distribution line 11 (the same as in FIG. 12). In this example, the system model M0 is a model that groups together the power distribution lines 111 to 114. The feeder number 0 indicates that the power distribution lines 111 to 114 are grouped together.

[0108] Also, "node number" means node N 01 ~N 04 Specifically, the node numbers 1 to 4 correspond to the node N 01 ~N 04 This shows that.

[0109] In FIG. 12(a), node N 01 At (node ​​number=1), a reference voltage of 66,000 V and a reference phase angle of 0.0 rad are set.

[0110] FIG. 12(b) shows the node N 01 ~N 04 In this example, the feeder number, node number, node type, active power, reactive power, etc. are shown.

[0111] Here, the "node type" is any one of a slack, a distribution transformer (primary side), a distribution transformer (secondary side), and a load.

[0112] Here, node N whose node type is not load 01 ~N 03 For (node ​​numbers 1 to 3), the active power is all 0.0 kW, and the reactive power is all 0.0 kVar.

[0113] On the other hand, node N whose node type is load 04 For (node ​​number=4), the active power is 3,000.0 kW, which corresponds to the total value of the active power acquired by the first acquisition unit 211 in step S31 (FIG. 6). Similarly, the reactive power is 1,300 kVar, which corresponds to the total value of the reactive power acquired by the first acquisition unit 211 in step S31.

[0114] Figure 12(c) shows branch B 01 ~B 03 In this example, the feeder number, the node number (upstream side), the node number (downstream side), the branch type, the distribution line resistance, the distribution line admittance, etc. are shown.

[0115] The "node number (upstream side)" and the "node number (downstream side)" are adjacent nodes, and define the branch that connects these nodes. For example, a branch with a node number (upstream side) of 1 and a node number (downstream side) of 2 is called branch B. 01 Corresponds to.

[0116] "Power distribution line resistance" is the resistance of the power distribution line 11 between the devices corresponding to the node number (power source side) and the node number (load side).

[0117] "Distribution line admittance" is the admittance of the distribution line between the devices corresponding to the node number (power source side) and the node number (load side).

[0118] 12(d) is a diagram showing information on the distribution transformer 101. In this example, the node number, control mode, primary rated voltage, secondary rated voltage, target voltage, dead band, and voltage step-up / step-down width are shown.

[0119] The "node number" in FIG. 12(d) is a number indicating the node to which the distribution transformer 101 is linked, and in this example, the node number (=3) of the secondary side of the distribution transformer 101 is indicated.

[0120] The "control mode" is the control mode adopted by the distribution transformer 101, which is LDC in this example. The "primary rated voltage" and the "secondary rated voltage" are the upper limit voltages set as rated voltages on the primary and secondary sides of the distribution transformer 101.

[0121] The "target voltage" is the target value of the voltage adjusted by the distribution transformer 101. The "dead band" is a voltage range in which the distribution transformer 101 does not perform adjustment operations even if a signal such as a voltage changes. The "boost / decrease voltage range" is the range of voltage that increases or decreases by switching the tap position by one step.

[0122] The values ​​of the items in each diagram in FIG. 12 are recorded in the lineage information DB 220 (FIG. 2).

[0123] Node N obtained by the power flow calculation in step S33 03 is considered to be the voltage on the secondary side of the distribution transformer 101. In this example, the voltage on the secondary side of the distribution transformer 101 is 6,800V as shown in FIG.

[0124] Next, in step S34, the second calculation unit 214 obtains the secondary voltage (6,800 V) of the distribution transformer 101 obtained by the power flow calculation in step S33.

[0125] Next, in step S35, the second calculation unit 214 sets the voltages acquired in step S34 as the voltages of the slack nodes of each of the four distribution lines 111 to 114 that are the subject of the calculation.

[0126] Next, returning to FIG. 10, in step S40, the second calculation unit 214 performs power flow calculations for each of the system models M1 to M4.

[0127] At this time, as shown in FIG. 8, the slack nodes (nodes N 11 ,N 21 ,N 31 ,N 41 ) is set to the secondary voltage (6,800 V) of distribution transformer 101 obtained by the power flow calculation in step S33.

[0128] Figure 13 is a diagram for explaining the settings of the power flow calculation by the second calculation unit 214 in step S40. The items shown in Figure 13 are the same as those shown in Figure 12, so detailed explanations of the overlapping points will be omitted.

[0129] In addition, in FIG. 13, a “feeder number” of 1 indicates the power distribution line 111.

[0130] In addition, the "node number" in Fig. 13 is the node N of the system model M1 (Fig. 9(b)). 11 ~N 19Specifically, the node numbers 1 to 9 correspond to the node N 11 ~N 19 This shows that.

[0131] In particular, in FIG. 13(a), the reference voltage is calculated at node N 03 The voltage is set to 6,800V.

[0132] Next, in step S50, the output unit 215 outputs the result of the power flow calculation in step S40 to the measurement value DB 221 (FIG. 2).

[0133] Finally, in step S60, the output unit 215 displays the measurement results of the power flow calculation in step S40 on a display device such as a liquid crystal monitor.

[0134] This completes the process of displaying the results of the power flow calculation. According to the procedure described above, first, the voltage at point B1 (FIG. 1) on the secondary side of the distribution transformer is calculated with high accuracy. Therefore, in the subsequent power flow calculation, it becomes possible to estimate the state of the power system with high accuracy.

[0135] ==Summary== The information processing device 2 of the embodiment described above is an information processing device 2 that calculates a state of an electric power system 1 including a distribution transformer 10 capable of changing a transformation ratio between a primary side and a secondary side by a tap using an LDC method, a plurality of distribution lines 11 each having one end connected to the secondary side of the distribution transformer 10, and a plurality of loads connected to each of the plurality of distribution lines 11, and includes a first acquisition unit 211 that acquires a first total value P of active power and a second total value Q of reactive power of the loads included in the electric power system 1, and a node N corresponding to a sending point of the electric power system 1. 01 , a node N corresponding to a given point on the primary side of the distribution transformer 10 02 , a node N corresponding to a given point on the secondary side of the distribution transformer 10 03 , at least the loads included in the power system 1 are virtually grouped together at node N 04 , node N 01and node N 02 Branch B that connects 01 , node N 02 and node N 03 Branch B that connects 02 , node N 03 and node N 04 Branch B that connects 03 Based on the second acquisition unit 212 that acquires a model including the power system model M0 and system information indicating the components of the power system 1 and the electrical characteristics of the components, the node N 04 The tap position and node N when the active power and reactive power of are the sum values ​​P and Q, respectively. 03 and a first calculation unit 213 that calculates the voltage of

[0136] According to this configuration, the voltage at a given point on the secondary side of the LDC-based distribution transformer 10 is 03 Therefore, it is possible to estimate the state of the power grid 1 with high accuracy.

[0137] The information processing device 2 of the above embodiment further includes a generation unit 210 that generates the system model M0. With this configuration, it is possible to generate the system model M0 and calculate the state of the power system 1 in one device.

[0138] In the information processing device 2 of the above embodiment, the power system 1 further includes a sensor installed upstream of the load on each of the multiple distribution lines 11, and the first acquisition unit 211 acquires a total value P of the active power measurement values ​​of the sensors of the multiple distribution lines 11, and acquires a total value Q of the reactive power measurement values ​​of the sensors of the multiple distribution lines 11. 04 This improves the accuracy of the total active power value P and the total reactive power value Q. Therefore, it becomes possible to estimate the state of the power system 1 with even higher accuracy.

[0139] In the information processing device 2 of the above embodiment, the node N 04is a node that virtually brings together the loads and the power generation facilities included in the power system 1. With this configuration, even if a large number of power generation facilities such as photovoltaic power generation facilities connected to the distribution line 11 are introduced, it is possible to accurately estimate the state of the power system 1.

[0140] In addition, the information processing device 2 of the above embodiment calculates the node N 03 The power system further includes a second calculation unit 214 that performs a power flow calculation for a section of the power system 1 that includes at least one of the multiple distribution lines 11, using the voltage at the upstream end of each of the multiple distribution lines 11 as the voltage at the upstream end of each of the multiple distribution lines 11. With this configuration, it becomes possible to accurately estimate the state of the section that includes the distribution line 11.

[0141] The information processing method of the above embodiment is an information processing method in which an information processing device 2 calculates a state of a power system 1 including a distribution transformer 10 capable of changing a transformation ratio between a primary side and a secondary side by a tap using an LDC method, a plurality of distribution lines 11 each having one end connected to the secondary side of the distribution transformer 10, and a plurality of loads connected to each of the plurality of distribution lines 11, and includes a step of acquiring a total value P of active power and a total value Q of reactive power of the loads included in the power system 1, and a step of calculating a node N corresponding to a sending point of the power system. 01 , a node N corresponding to a given point on the primary side of the distribution transformer 10 02 , a node N corresponding to a given point on the secondary side of the distribution transformer 10 03 , node N which virtually represents the loads in power system 1 04 , node N 01 and node N 02 Branch B that connects 01 , node N 02 and node N 03 Branch B that connects 02 , node N 03 and node N 04 Branch B that connects 03 and acquiring a system model M0 including the power system 1 and a node N based on the system model M0 and system information indicating components of the power system 1 and electrical characteristics of the components. 04The tap position and node N when the active power and reactive power of are the sum values ​​P and Q, respectively. 03 and calculating the voltage of

[0142] According to this method, the voltage at a given point on the secondary side of the LDC distribution transformer 10 is 03 Therefore, it is possible to estimate the state of the power grid 1 with high accuracy.

[0143] The information processing program of the above embodiment is an information processing program for calculating a state of an electric power system 1 including a distribution transformer 10 capable of changing a transformation ratio between a primary side and a secondary side by a tap using an LDC method, a plurality of distribution lines 11 each having one end connected to the secondary side of the distribution transformer 10, and a plurality of loads connected to each of the plurality of distribution lines 11, the information processing program being stored in an information processing device 2, and including a first acquisition unit 211 for acquiring a total value P of active power and a total value Q of reactive power of the loads included in the electric power system 1, and a node N corresponding to a sending point of the electric power system 1. 01 , a node N corresponding to a given point on the primary side of the distribution transformer 10 02 , a node N corresponding to a given point on the secondary side of the distribution transformer 10 03 , node N which virtually represents the loads in power system 1 04 , node N 01 and node N 02 Branch B that connects 01 , node N 02 and N 03 Branch B that connects 02 , node N 03 and node N 04 Branch B that connects 03 and a second acquisition unit 212 that acquires a system model M0 including the node N based on the system model M0 and system information indicating components of the power system 1 and electrical characteristics of the components. 04 The tap position and node N when the active power and reactive power of are the sum values ​​P and Q, respectively. 03 and a first calculation unit 213 that calculates the voltage of

[0144] According to such a program, the voltage at a given point on the secondary side of the LDC-based distribution transformer 10 is calculated based on the voltage at node N 03 Therefore, it is possible to estimate the state of the power grid 1 with high accuracy.

[0145] The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. Furthermore, the present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0146] power system 1 Distribution transformers 10,101,102 Power lines 11,111,112,113,114,115,116,117 Power Lines 12 Data processing device 2 CPU 200 Memory 201 Communication device 202 Storage device 203 Input Device 204 Output Device 205 Recording medium reader 206 Generation section 210 First acquisition part 211 2nd acquisition part 212 1st calculation section 213 2nd calculation section 214 Output section 215 Lineage information DB220 Measurement value DB 221 Calculated value DB 222

Claims

1. An information processing device that calculates a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines each having one end connected to the secondary side of the distribution transformer, and a plurality of loads each connected to the plurality of distribution lines, a first acquisition unit that acquires a first sum of active power and a second sum of reactive power of the loads included in the power system; a second acquisition unit that acquires a model including a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, a third node corresponding to a predetermined point on the secondary side of the distribution transformer, a fourth node that virtually aggregates at least the loads included in the power system, a first branch connecting the first and second nodes, a second branch connecting the second and third nodes, and a third branch connecting the third and fourth nodes; a first calculation unit that calculates the tap position and the voltage of the third node when the active power and the reactive power of the fourth node are the first and second total values, respectively, based on the model and system information indicating components of the power system and electrical characteristics of the components. Information processing device.

2. 2. The information processing device according to claim 1, Further comprising a generating unit that generates the model. Information processing device.

3. 2. The information processing device according to claim 1, The power system further includes a first sensor installed on each of the plurality of power distribution lines upstream of the load; the first acquisition unit acquires a total value of active power measurements of the first sensors of the plurality of power distribution lines as the first total value, and acquires a total value of reactive power measurements of the first sensors of the plurality of power distribution lines as the second total value; Information processing device.

4. 2. The information processing device according to claim 1, The fourth node is a node that virtually aggregates the load and power generation facilities included in the power system. Information processing device.

5. The information processing device according to any one of claims 1 to 4, a second calculation unit that performs a power flow calculation for a section of the power system including at least one of the plurality of distribution lines by using the calculated voltage of the third node as a voltage of an upstream end of each of the plurality of distribution lines, Information processing device.

6. An information processing method for calculating a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines each having one end connected to the secondary side of the distribution transformer, and a plurality of loads each connected to the plurality of distribution lines, obtaining a first sum of active powers and a second sum of reactive powers of the loads included in the power grid; obtaining a model including a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, a third node corresponding to a predetermined point on the secondary side of the distribution transformer, a fourth node which virtually aggregates the loads included in the power system, a first branch connecting the first and second nodes, a second branch connecting the second and third nodes, and a third branch connecting the third and fourth nodes; and calculating a position of the tap and a voltage of the third node when the active power and the reactive power of the fourth node are the first and second sum values, respectively, based on the model and system information indicating components of the power system and electrical characteristics of the components. Information processing methods.

7. An information processing program for calculating a state of a power system including a distribution transformer capable of changing a transformation ratio between a primary side and a secondary side by a tap using a line voltage drop compensation method, a plurality of distribution lines each having one end connected to the secondary side of the distribution transformer, and a plurality of loads each connected to the plurality of distribution lines, the information processing program being stored in an information processing device; a first acquisition unit that acquires a first sum of active power and a second sum of reactive power of the loads included in the power system; a second acquisition unit that acquires a model including a first node corresponding to a sending point of the power system, a second node corresponding to a predetermined point on the primary side of the distribution transformer, a third node corresponding to a predetermined point on the secondary side of the distribution transformer, a fourth node that virtually aggregates the loads included in the power system, a first branch connecting the first and second nodes, a second branch connecting the second and third nodes, and a third branch connecting the third and fourth nodes; a first calculation unit that calculates the tap position and the voltage of the third node when the active power and the reactive power of the fourth node are the first and second sum values, respectively, based on the model and system information indicating components of the power system and electrical characteristics of the components. Information processing program.

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