Centralized voltage control system

Abstract

To provide a voltage centralized control system capable of accurately remote-controlling a voltage regulator in a distribution system without requisition of installation of a new measuring device in a distribution system with high-voltage.SOLUTION: The voltage centralized control system includes voltage regulators 1 and 5, local voltage control devices 15 and 16, an SM control management system 14, a load curve management system 9, an integrated support system 13, a power feeding control communication server 12, and a voltage management system 8. The voltage management system 8 acquires measurement information from a distribution automation system 10, acquires current distribution data calculated based on a calculating result of an SM 21 from the load curve management system 9, acquires facility data from the integrated support system 13, uses the acquired data to calculate setting values corresponding to the voltage regulators 1 and 5, sends the setting values to the local voltage control device 15 through the distribution automation system 10 and the power feeding control communication server 12, and sends the setting values to the local voltage control device 16 through the distribution automation system 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a centralized voltage control system that controls the voltage of a power system. [Background technology]

[0002] Conventionally, voltage control in power distribution systems has been achieved by using local voltage control devices integrated with or installed alongside transformer-type voltage regulators, such as LRTs (Load Ratio Control Transformers) or SVRs (Step Voltage Regulators), which perform autonomous and decentralized voltage control based on voltage and current measurement information near the voltage regulator's installation point. In addition to the transformer-type voltage regulators, other known voltage regulators include reactive power control devices such as phase-advancing capacitors and shunt reactors that automatically switch on and off, static var compensators (SVCs), and power conditioning systems (PCSs) with reactive power adjustment functions. Local voltage control devices corresponding to these voltage regulators are also in the practical application stage. Here, the PCS is, for example, a power conditioner for photovoltaic power generation or a storage battery, which connects the photovoltaic power generation facility or the storage battery to the power distribution system.

[0003] These local voltage control devices are designed on the assumption that the load distribution in a power distribution system fluctuates uniformly, i.e., that the voltage at each point in the power distribution system changes in the same direction over time. However, in recent years, due to the diversification of electricity usage and the spread of distributed power sources such as solar power generation, the load distribution in a power distribution system tends to fluctuate significantly over time, making it difficult to maintain an appropriate voltage using conventional voltage control in power distribution systems. For this reason, instead of autonomous distributed voltage control methods, centralized control methods have been proposed that centrally control the voltage of a power distribution system in a coordinated manner across the entire system. For example, Patent Document 1 discloses that a centralized voltage control device collects measurement information on voltage and current at multiple points in a high-voltage power distribution system using a dedicated network, determines the control amount of each voltage regulator based on this measurement information, and remotely commands the control amount to each voltage regulator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5393934 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to perform highly accurate remote control, conventional centralized voltage control devices must accurately grasp the state of the power distribution system. Therefore, it is necessary to periodically collect voltage and current information from each point in the power distribution system. However, at present, this measurement information is only collected from a small portion of the power distribution system. To obtain measurement information for the entire power distribution system, it is necessary to install new measurement devices in the high-voltage power distribution system.

[0006] The present disclosure has been made in consideration of the above, and aims to provide a centralized voltage control system that can accurately remotely control voltage regulators in a high-voltage distribution system without requiring the installation of new measuring devices in the distribution system. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the centralized voltage control system according to the present disclosure includes a voltage regulator connected to a distribution line in a power distribution system and controlling the voltage of the distribution line, a local voltage control device that controls the voltage regulator, and a meter control management system that acquires and aggregates the amount of power measured from metering devices that measure the amount of power consumed by consumers.The centralized voltage control system further includes a load curve management system that creates current distribution data for the distribution line based on the amount of power aggregated by the meter control management system, a comprehensive support system that manages equipment data that is information about equipment on the distribution line, a distribution automation system that acquires status information indicating the status of switches connected to the distribution line and measurement information indicating measured values ​​of the voltage and current of the distribution line, a supply communication server that can communicate with a first voltage regulator that is a voltage regulator in a distribution substation among the voltage regulators, and a voltage management system. The voltage management system acquires measurement information from the power distribution automation system, acquires current distribution data from the load curve management system, acquires equipment data from the comprehensive support system, calculates setting values ​​corresponding to voltage regulators using the measurement information, current distribution data, and equipment data, transmits the calculated setting value corresponding to a first voltage regulator to a local voltage control device corresponding to the first voltage regulator via the power distribution automation system and the power supply communication server, and transmits the calculated setting value corresponding to a second voltage regulator, which is a voltage regulator other than the first voltage regulator, to a local voltage control device corresponding to the second voltage regulator via the power distribution automation system. [Effects of the Invention]

[0008] The centralized voltage control system according to the present disclosure has the advantage of being able to remotely control voltage regulators in a power distribution system with high accuracy without requiring the installation of new measuring devices in the high-voltage power distribution system. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a centralized voltage control system according to an embodiment and a power distribution system that is a target for control by the centralized voltage control system. [Figure 2] FIG. 1 is a diagram showing an example of data linkage in a centralized voltage control system according to an embodiment; [Figure 3] FIG. 1 is a diagram illustrating an example of the configuration of a voltage management system according to an embodiment; [Figure 4] 1 is a flowchart showing an example of a system analysis according to an embodiment. [Figure 5] 1 is a flowchart showing an example of accumulated data processing according to an embodiment; [Figure 6] 10 is a flowchart showing an example of a ΔV calculation process according to an embodiment. [Figure 7] 1 is a flowchart showing an example of real-time processing according to an embodiment. [Figure 8] 1 is a flowchart showing an example of batch processing according to an embodiment; [Figure 9] 1 is a flowchart showing an example of a calculation process of a local setting value according to an embodiment; [Figure 10] FIG. 1 is a diagram illustrating an example of the configuration of a computer system that implements a voltage management system according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] A centralized voltage control system according to an embodiment will be described in detail below with reference to the drawings.

[0011] Embodiment FIG. 1 is a diagram showing an example of the configuration of a centralized voltage control system and a power distribution system controlled by the centralized voltage control system according to an embodiment. In FIG. 1, voltage regulator 1 is, for example, an LRT serving as a distribution transformer installed in a substation. A local voltage control device 15 is connected to voltage regulator 1, and local voltage control device 15 controls voltage regulator 1. Local voltage control device (voltage control device) 15 can be, for example, integrated with or installed alongside voltage regulator 1. Local voltage control device 15 controls voltage regulator 1 by adjusting the control variable of voltage regulator 1, specifically by adjusting the tap position. Furthermore, local voltage control device 15 has a communication function and is connected to a communication network 7. Communication network 7 is, for example, a dedicated optical fiber network, and is provided for the purpose of monitoring and controlling the power distribution system.

[0012] A bus 2 is connected to the secondary side of the voltage regulator 1. For example, two distribution lines 4-1 and 4-2 are connected in parallel to the bus 2. The distribution lines 4-1 and 4-2 are distribution lines of a high-voltage system (with a voltage level of, for example, 6600 V).

[0013] One end of the distribution line 4-1 is connected to the bus 2 via a circuit breaker 3-1. Automatic switches 6 are installed at multiple locations on the distribution line 4-1, measuring the voltage and current of the distribution line 4-1. That is, the automatic switches 6 are connected to the distribution line 4-1, and not only open and close the electrical circuit but also have a measurement function, measuring the voltage and current at the connection points and outputting the measurement values ​​as measurement information. The measurement values ​​also include binary status information (hereinafter referred to as SV) that indicates the state of the automatic switch 6. Hereinafter, the measurement values ​​of voltage and current are also referred to as TM. The automatic switch 6 has a communication function and is connected to a communication network 7. The automatic switch 6 transmits the measurement information to the distribution automation system 10 via the communication network 7, for example, periodically.

[0014] Also connected to the distribution line 4-1 is a voltage regulator 5, which is an SVR for voltage drop compensation. A local voltage control device 16 that controls the voltage regulator 5 is connected to the voltage regulator 5. The local voltage control device 16 can be, for example, integrated with the voltage regulator 5 or installed alongside it. The local voltage control device 16 controls the voltage regulator 5 by adjusting the control variable of the voltage regulator 5, specifically by adjusting the tap position. The local voltage control device 16 also has a communication function and is connected to a communication network 7. The local voltage control device 16 measures voltage and current and periodically transmits measurement information indicating the measurement values ​​to the distribution automation system 10 via the communication network 7.

[0015] One end of distribution line 4-2 is connected to bus 2 via circuit breaker 3-2. As with distribution line 4-1, automatic switches 6 that measure the voltage and current of distribution line 4-2 are installed at multiple locations on distribution line 4-2. As with distribution line 4-1, distribution line 4-2 is also connected to voltage regulator 5, which is an SVR, and voltage regulator 5 is connected to local voltage control device 16 that controls voltage regulator 5.

[0016] The power distribution lines 4-1 and 4-2 are high-voltage power distribution lines, and although not shown in the figure, a low-voltage power distribution line that constitutes a low-voltage system (with a voltage level of, for example, 100V to 200V) is connected to each of the power distribution lines 4-1 and 4-2 via a transformer. A load 20 is connected to the low-voltage power distribution line. A smart meter (hereinafter abbreviated as SM) 21, which is a measuring device that measures the amount of electricity consumed by consumers, is also connected to the low-voltage power distribution line. A distributed power source such as a solar power generation system is also connected to the low-voltage power distribution line. Note that while FIG. 1 shows the load 20 and SM21 connected to the power distribution line 4-2, the load 20 and SM21 are similarly connected to the power distribution line 4-1, and a distributed power source such as a solar power generation system is also connected to the low-voltage power distribution line. In addition, a high-voltage distribution line for supplying power at high voltage without being converted to low voltage may be connected to the distribution lines 4-1 and 4-2, and a load 20 and SM 21 may be connected to the high-voltage distribution line, and a distributed power source may be connected to the high-voltage distribution line. Hereinafter, unless otherwise specified, the term "distribution system" refers to the high-voltage system. Furthermore, voltage control of the distribution system refers to voltage control of the high-voltage system.

[0017] As shown in FIG. 1, a power supply control system 11, a power supply control communication server 12, a power distribution automation system 10, a voltage management system 8, a load curve management system 9, a comprehensive support system 13, and a smart meter control management system (hereinafter abbreviated as SM control management system) 14 are connected to a communication network 7. In FIG. 1, the power supply control system 11, the power supply control communication server 12, the power distribution automation system 10, the voltage management system 8, the load curve management system 9, the comprehensive support system 13, and the SM control management system 14 constitute a centralized voltage control system of this embodiment. In FIG. 1, the power supply control system 11, the power supply control communication server 12, the power distribution automation system 10, the voltage management system 8, the load curve management system 9, the comprehensive support system 13, and the SM control management system 14 are connected to the communication network 7, but communication between these devices may be performed via a communication network separate from the communication network 7.

[0018] The distribution automation system 10 is connected to each of the local voltage control devices 16 and the plurality of automatic switchgears 6 via a communication network 7. The distribution automation system 10 receives measurement information from each of the automatic switchgears 6 and each of the local voltage control devices 16 via the communication network 7. The distribution automation system 10 transmits the received measurement information to a voltage management system 8.

[0019] The SM control management system (meter control management system) 14 acquires measurement information indicating measurement values ​​such as the amount of power measured by the SM21 from the SM21 via the SM communication network 22, and transmits the acquired measurement information to the load curve management system 9 via the communication network 7. The load curve management system 9 converts the amount of power, which is the measurement information of SM21 received from the SM control management system 14 via the communication network 7, into a current value, uses the converted current value to generate current distribution data in the power distribution system, and transmits the generated current distribution data to the voltage management system 8 via the communication network 7.

[0020] The supply control system 11 manages the substation in which the voltage regulator 1 is installed. The supply control communication server 12 is a communication server in the substation. The comprehensive support system 13 manages equipment data indicating the connection position, equipment type, impedance, etc. of each piece of equipment in the power distribution system. The comprehensive support system 13 transmits the equipment data to the power distribution automation system 10. The equipment data is also transmitted from the power distribution automation system 10 to the voltage management system 8. Here, the equipment data is transmitted to the voltage management system 8 via the power distribution automation system 10, but the equipment data may also be transmitted from the comprehensive support system 13 to the voltage management system 8.

[0021] The voltage management system 8 receives measurement information indicating the measurement values ​​measured by the automatic switchgear 6 via the power distribution automation system 10. To minimize system load while responding to unexpected voltage fluctuations, the voltage management system 8 uses the measurement information to calculate upper and lower voltage limits (hereinafter also referred to as upper and lower voltage limits) that define the target voltage range controlled by each local voltage control device 16, thereby determining the set values. In this embodiment, there are three methods for calculating the set values: batch processing, in which multiple set values ​​are distributed in advance for each centralized control period and updated periodically; real-time processing, in which set values ​​are updated whenever necessary; and local set value calculation processing. Here, the centralized control period is described as being 30 minutes, but the centralized control period is not limited to this. The set values ​​are a reference voltage and a dead band width. The reference voltage indicates the intermediate value between the upper and lower voltage limits, and the dead band width indicates the difference between the upper and lower voltage limits and the reference voltage. Furthermore, the voltage management system 8 receives measurement information indicating the measurement values ​​measured by the local voltage control device 16 from the distribution automation system 10, and adjusts the setting values ​​based on the measurement information, i.e., the control results.

[0022] Batch processing is a process in which voltage rise / drop values ​​for a day are estimated based on past current distribution data received from the load curve management system 9, and the estimated results are used to calculate setting values ​​that can maintain an appropriate voltage. Past current distribution data is stored in the voltage management system 8, separated by weekdays and holidays, and current distribution data for a certain period of the past (e.g., 7 days or 10 days) is used in batch processing. In addition, in batch processing, setting values ​​are calculated for 48 time sections per day, each 30 minutes long, which is the centralized control cycle. The calculated setting values ​​are transmitted to each local voltage control device 15, 16, for example, every half day, at a timing that does not affect the operation of equipment currently in operation.

[0023] Setting of setting values ​​in real-time processing is performed when the setting values ​​set in batch processing cannot be accommodated due to unexpected, sudden voltage fluctuations caused by weather changes, etc., and is a process for temporarily changing the setting values. The voltage management system 8 constantly monitors the measurement values ​​indicated by the measurement information of the automatic switchgear 6 at monitoring intervals (measurement intervals), and performs real-time processing when there is a deviation of the voltage from the appropriate range. Here, the monitoring interval is assumed to be one minute, but the monitoring interval is not limited to this.

[0024] In this embodiment, the voltage management system 8 also calculates local setting values. The local setting values ​​are calculated, for example, about once a year, based on the annual maximum load and power generation data obtained from the load curve management system 9, and are used by the local voltage control devices 15 and 16 during autonomous operation (control when the setting values ​​calculated by batch processing and real-time processing cannot be linked).

[0025] The voltage management system 8 commands the setting values ​​corresponding to each of the local voltage control devices 15, 16 to each of the local voltage control devices 15, 16 via the distribution automation system 10 and the communication network 7. Note that the voltage management system 8 commands the setting values ​​corresponding to each of the local voltage control devices 15 to each of the local voltage control devices 15 via the distribution automation system 10, the communication network 7, and the supply communication server 12. In detail, the voltage management system 8 acquires measurement information from the distribution automation system 10, acquires current distribution data from the load curve management system 9, acquires equipment data from the comprehensive support system 13, and calculates setting values ​​corresponding to the voltage regulators using the measurement information, current distribution data, and equipment data. Then, the voltage management system 8 transmits the calculated setting values ​​corresponding to voltage regulator 1, which is the first voltage regulator, to the local voltage control device 15 corresponding to voltage regulator 1 via the power distribution automation system 10 and the power supply communication server 12, and transmits the calculated setting values ​​corresponding to voltage regulator 5 (second voltage regulator), which is a voltage regulator other than voltage regulator 1, to the local voltage control device 16 corresponding to voltage regulator 5 via the power distribution automation system 10.

[0026] Each local voltage control device 15, 16 controls its controlled voltage regulator 1, 5 so as to maintain the voltage between the upper and lower voltage limit values ​​indicated by the setting value based on the setting value commanded by the voltage management system 8. Each time a setting value command is received from the voltage management system 8, each local voltage control device 15, 16 updates and sets the upper and lower voltage limit values.

[0027] Based on the setting values ​​commanded by the voltage management system 8 through batch processing, the local voltage control device 15 adjusts the control amount (amount of change in tap position) of the voltage regulator 1 in a local control period shorter than the centralized control period so that the secondary voltage of the voltage regulator 1 falls between the upper and lower voltage limit values ​​corresponding to the setting values ​​(within the control target voltage range) during the period of the centralized control period to which the setting values ​​are applied. Here, the local control period is assumed to be one minute, but the local control period is not limited to this.

[0028] Furthermore, based on the setting value commanded by the voltage management system 8 through batch processing, the local voltage control device 16 adjusts the control amount of the voltage regulator 5 in a local control period shorter than the centralized control period so that the voltage at the point where the voltage regulator 5 is connected to the power distribution system falls between the upper and lower voltage limit values ​​corresponding to the setting value (within the control target voltage range) during the period of the centralized control period in which the setting value is applied.

[0029] When a setting value is commanded by real-time processing, the local voltage controllers 15 and 16 immediately reflect the received setting value.

[0030] FIG. 2 is a diagram illustrating an example of data linkage in the centralized voltage control system of this embodiment. The centralized voltage control system includes voltage regulators 1 and 5, local voltage control devices 15 and 16, an SM control management system 14, a load curve management system 9, a distribution automation system 10, a supply communication server 12, and a voltage management system 8. Voltage regulator 1 is a voltage regulator in a distribution substation among voltage regulators 1 and 5 in a distribution system, and voltage regulator 5 is a voltage regulator (second voltage regulator) other than the first voltage regulator. Note that FIG. 2 does not illustrate the local voltage control devices 15 and 16 and the communication network 7. As shown in FIG. 2, the voltage management system 8 acquires equipment data held by the comprehensive support system 13 via the distribution automation system 10. Furthermore, the voltage management system 8 acquires measurement values ​​measured by the automatic switchgear 6 and the voltage regulator 5 as measurement information via the distribution automation system 10. Although not shown in FIG. 2 , data exchange between the voltage regulator 5 and the distribution automation system 10 is performed via the local voltage control device 16. Also, although not shown, the voltage management system 8 may receive the measurement values ​​measured by the voltage regulator 1 as measurement information via the local voltage control device 15, the distribution automation system 10, and the power supply communication server 12. With regard to the voltage regulator 5, the setting values ​​calculated by the voltage management system 8 are received by the voltage regulator 5 via the local voltage control device 16 (not shown) and the distribution automation system 10. With regard to the voltage regulator 1, the setting values ​​calculated by the voltage management system 8 are received by the voltage regulator 1 via the local voltage control device 15 (not shown), the power supply communication server 12, and the distribution automation system 10.

[0031] The amounts of power measured by the SMs 21 are aggregated by the SM control management system 14, and the aggregated measurement values ​​are received as measurement information by the load curve management system 9. The load curve management system 9 creates current distribution data using the aggregated measurement values. The current distribution data is transmitted from the load curve management system 9 to the voltage management system 8. In this way, data is linked between the devices in the centralized voltage control system.

[0032] FIG. 3 is a diagram illustrating an example of the configuration of voltage management system 8 according to the present embodiment. As illustrated in FIG. 3, voltage management system 8 according to the present embodiment includes a communication unit 81, a system analysis unit 82, a first setting value calculation unit 83, an accumulated data processing unit 84, a voltage change calculation unit 85, a second setting value calculation unit 86, a third setting value calculation unit 87, and a storage unit 88. First setting value calculation unit 83, second setting value calculation unit 86, and third setting value calculation unit 87 are all setting value calculation units that calculate the setting values ​​of voltage regulators 1 and 5. Although the configuration example illustrated in FIG. 3 is divided into three calculation units, a single setting value calculation unit may perform the calculations of first setting value calculation unit 83, second setting value calculation unit 86, and third setting value calculation unit 87.

[0033] The communication unit 81 communicates with other devices via the communication network 7. The communication unit 81 may also communicate via a communication network other than the communication network 7. For example, the communication unit 81 receives equipment data from the power distribution automation system 10 and stores the received equipment data in the storage unit 88. Furthermore, when the communication unit 81 receives measurement information from the power distribution automation system 10, it outputs the information to the system analysis unit 82 and stores it in the storage unit 88. When the communication unit 81 receives current distribution data from the load curve management system 9, it stores the received current distribution data in the storage unit 88. Furthermore, as described above, the current distribution data is stored in the storage unit 88, separated into weekdays and holidays.

[0034] The system analysis unit 82 performs system analysis at each monitoring interval (described later) using the measurement information received from the communication unit 81. The first setpoint calculation unit 83 calculates setpoints through real-time processing using the system analysis results of the system analysis unit 82 and stores the calculated setpoints in the storage unit 88. The accumulated data processing unit 84 performs processing to calculate a voltage imbalance correction value, which is accumulated data, using accumulated information stored in the storage unit 88. The accumulated information and accumulated data will be described later. The voltage change calculation unit 85 uses the accumulated data stored in the storage unit 88 to calculate ΔV, which is a voltage change value (voltage drop value, voltage rise value) from the measured voltage of the voltage regulators 1 and 5 at each location in the distribution system, and calculates a maximum voltage rise value and a maximum voltage drop value using ΔV, and stores the calculation results in the storage unit 88 as maximum / minimum data. The second setpoint calculation unit 86 uses the maximum / minimum data stored in the storage unit 88 to calculate setpoints through batch processing and stores the calculated setpoints in the storage unit 88. The third setting value calculation unit 87 uses the maximum and minimum data stored in the storage unit 88 to calculate a setting value through a local setting value calculation process, and stores the calculated setting value in the storage unit 88.

[0035] The setting values ​​stored in the storage unit 88 are transmitted to the corresponding devices by the communication unit 81. For example, the communication unit 81 commands the local voltage control device 15 to set a setting value (a setting value corresponding to the voltage regulator 1) by transmitting the setting value corresponding to the local voltage control device 15 to the local voltage control device 15 via the power distribution automation system 10, the communication network 7, and the supply communication server 12. The communication unit 81 also commands the local voltage control device 16 to set a setting value by transmitting the setting value corresponding to the local voltage control device 16 (a setting value corresponding to the voltage regulator 5) to the corresponding local voltage control device 16 via the power distribution automation system 10 and the communication network 7.

[0036] Next, the operation of the voltage management system 8 of this embodiment will be described. Fig. 4 is a flowchart showing an example of system analysis of this embodiment. The system analysis unit 82 performs the process shown in Fig. 4 at monitoring intervals.

[0037] The system analysis unit 82 first acquires measurement information (measurement values) (step S11). More specifically, the system analysis unit 82 acquires the measurement values ​​by receiving the latest measurement information from the communication unit 81. Next, the system analysis unit 82 fixes the system (step S12). More specifically, the system analysis unit 82 uses the equipment data in the storage unit 88 to associate each measurement value with each piece of equipment in the distribution system, which is the automatic switch 6 or the voltage regulator 5, and thereby assigns each measurement value to each piece of equipment.

[0038] Next, the system analysis unit 82 performs SV analysis (step S13). Specifically, the state of each piece of equipment in the distribution system is set to a system state based on the SV of the corresponding measurement value. That is, the system analysis unit 82 creates a current system for performing setting value calculation.

[0039] Next, the system analysis unit 82 performs a TM analysis (step S14), and ends the process.

[0040] Next, the accumulated data processing will be described. Fig. 5 is a flowchart showing an example of the accumulated data processing of this embodiment. The accumulated data processing unit 84 determines whether it is time to process the accumulated data (step S21). Here, it is assumed that the accumulated data processing is performed every centralized control period, that is, every 30 minutes. Therefore, it is determined that it is time to process the accumulated data every 30 minutes, that is, once every 30 minutes. If it is not time to process the accumulated data (step S21 No), step S21 is repeated.

[0041] If it is time to process the accumulated data (Yes in step S21), the accumulated data processing unit 84 performs statistical processing of the accumulated information (step S22). The accumulated information is measurement information stored in the storage unit 88 by the communication unit 81. The accumulated information is measurement information accumulated since the previous accumulated data processing was performed, and is measurement information for a centralized control period, i.e., 30 minutes. In detail, in step S22, the accumulated data processing unit 84 obtains a voltage imbalance correction value for each monitoring period, and calculates the average value (average value of maximum values ​​and average value of minimum values) of the voltage imbalance correction value for the centralized control period, i.e., for every 30 minutes. The voltage imbalance correction value is a correction value for correcting the imbalance in each phase voltage. For example, the voltage imbalance correction value is calculated by calculating the V corresponding to the maximum value (maximum value (upper)) Rmax and V corresponding to the minimum value (maximum value (below)) Rmin are calculated using the following formulas (1) and (2), where V1, V2, and V3 are the voltages of each phase. V Rmax =V max -V ave ···(1) V Rmin =V ave -V min ···(2) V ave =(V1+V2+V3)÷3 V max =max(V1,V2,V3) V min =min(V1,V2,V3)

[0042] If the tap zones at the voltage monitoring location and the load side are different, the maximum and minimum values ​​are calculated for each of side A (monitoring location side) and side D (load side).The accumulated data processing unit 84 then calculates the average of the maximum values ​​and the average of the maximum values ​​in 30-minute intervals.In this way, the accumulated data processing unit 84 calculates a voltage imbalance correction value for each centralized control period, which is longer than the measurement period, using the measurement information acquired for each measurement period.

[0043] Next, the accumulated data processing unit 84 stores the processing result (step S23). Specifically, the accumulated data processing unit 84 stores the processing result of step S22 in the storage unit 88 as accumulated data (voltage imbalance correction value).

[0044] Next, the accumulated data processing unit 84 resets the accumulated information (step S24) and ends the process. In detail, in step S24, the accumulated data processing unit 84 resets the accumulated information by erasing the accumulated information stored in the storage unit 88 or by moving the accumulated information to another location.

[0045] FIG. 6 is a flowchart showing an example of a ΔV calculation process according to this embodiment. The ΔV calculation process calculates the ΔV of each node in a power distribution system and also calculates the maximum voltage increase and decrease values ​​within the voltage regulation range and voltage monitoring range. The voltage regulation range is the range that is adjusted by each voltage regulator 1, 5, e.g., the range from the target voltage regulator 1, 5 to the downstream voltage regulator 5. The voltage monitoring range is, for example, a range obtained by dividing the voltage regulation range by points at which measurement values ​​are acquired. The ΔV calculation process is performed in each of the following cases, i.e., when a factor corresponding to each of the following cases occurs: Case #1 is when current distribution data for local setting values ​​is acquired; Case #2 is when current distribution data for batch processing / real-time processing is acquired; Case #3 is when SV changes (when the system state changes); and Case #4 is when equipment data is updated (when the system is changed).

[0046] As shown in Fig. 6, the voltage change calculation unit 85 determines whether it is time to calculate ΔV (step S31). Calculation of ΔV is performed every half day, for example, when corresponding to batch processing of Case #2, and in other cases, it is performed when an event that triggers calculation occurs. Furthermore, if a time period during which ΔV is calculated is set, for example, by setting a time during which no setting value is accepted in the voltage regulator 1, the voltage change calculation unit 85 does not calculate ΔV during that time period. If it is not time to calculate ΔV (No in step S31), the voltage change calculation unit 85 repeats step S31.

[0047] If it is the timing to calculate ΔV (Yes in step S31), the voltage change calculation unit 85 determines whether there is a distribution line to be processed (step S32). In detail, the voltage change calculation unit 85 determines all distribution lines to be processed according to the case as follows, and determines whether there is an unprocessed distribution line among all distribution lines to be processed. All distribution lines to be processed are determined as follows for each of the above-mentioned cases. In cases #1 and #2, all distribution lines of the distribution system to be managed are set as all distribution lines to be processed, in case #3, distribution lines whose system state has changed are set as all distribution lines to be processed, and in case #4, distribution lines whose system has been changed are set as all distribution lines to be processed.

[0048] If there is no distribution line to be processed (step S32: No), the voltage change calculation unit 85 ends the process. If there is a distribution line to be processed (step S32: Yes), the voltage change calculation unit 85 performs grid fixation (step S33). Specifically, the voltage change calculation unit 85 selects a distribution line to be processed from among the unprocessed distribution lines, and sets the selected distribution line to the standard grid in case #1 and to the current grid in cases #2 to #4. Furthermore, if the concentrated voltage period is 30 minutes, the voltage change calculation unit 85 sets a 48-hour section of the ΔV calculation target date corresponding to each of cases #1 to #4 as the processing target date and time. Note that, for example, there is no ΔV calculation target date in case #1, the ΔV calculation target date is the target date of the acquired current distribution data in case #2, and the ΔV calculation target date is a certain period (e.g., 10 days) in the past for each of cases #3 and #4, which are divided into weekdays and holidays.

[0049] Next, the voltage change calculation unit 85 sets a voltage adjustment range and a voltage monitoring range (step S34). Next, the voltage change calculation unit 85 determines whether or not calculation of all time cross sections to be calculated has been completed (step S35). If calculation of all time cross sections to be calculated has been completed (step S35 Yes), the voltage change calculation unit 85 repeats the process from step S32. For example, if the processing target is one day and calculation is performed for each time cross section corresponding to the concentrated voltage period, the voltage change calculation unit 85 determines that calculation of all time cross sections to be calculated has been completed when calculation of 48 time cross sections has been completed. Note that if the ΔV calculation process is not for batch processing, it is sufficient to perform processing for the required number of time cross sections instead of 48 time cross sections.

[0050] If there is a time cross section for which calculation has not been performed among all the time cross sections to be calculated (No in step S35), the voltage change calculation unit 85 performs load allocation (step S36). In detail, the voltage change calculation unit 85 uses the equipment data and the current distribution data to allocate the current distribution data of the time cross section to be processed to each piece of equipment of the distribution line by linking it to each piece of equipment.

[0051] Next, the voltage change calculation unit 85 calculates ΔV (step S37). Specifically, using the allocation results of step S36 and the equipment data, the voltage change calculation unit 85 calculates ΔV at each node of the distribution line being processed, i.e., the voltage change value from the voltage regulator 1, 5 at the starting point of the voltage regulation range to which the node belongs, for each node, for both the case of a voltage rise that takes power generation into consideration and the case of a voltage drop that does not take power generation into consideration. Next, the voltage change calculation unit 85 calculates and stores the maximum voltage rise value and maximum voltage drop value (step S38), and repeats the process from step S32. Specifically, in step S38, the voltage change calculation unit 85 uses the voltage change value of each node to calculate the maximum voltage rise value and maximum voltage drop value within the voltage regulation range and the voltage monitoring range, and stores the calculated results in the storage unit 88 as maximum / minimum data.

[0052] In this way, the voltage change calculation unit 85 uses the equipment data to allocate the current distribution data to the equipment, and then uses the allocation results to estimate the maximum voltage rise value and maximum voltage drop value within the voltage regulation section, which is the section corresponding to the voltage regulator. The estimated maximum voltage rise value and maximum voltage drop value are used to calculate the setting values, which will be described later.

[0053] 7 is a flowchart showing an example of real-time processing according to this embodiment. The first setting value calculation unit 83 determines whether or not it is time for real-time processing (step S41). Here, it is assumed that real-time processing is performed every monitoring period, i.e., every minute, as described above. Therefore, it is determined that it is time for real-time processing every time one minute passes, i.e., once per minute. However, if a time period in which processing is prohibited is set, the first setting value calculation unit 83 does not perform real-time processing during that time period. If it is not time for real-time processing (No in step S41), the first setting value calculation unit 83 repeats step S41.

[0054] If it is the real-time processing timing (Yes in step S41), the first set value calculation unit 83 determines whether there is any equipment to be processed (step S42). Specifically, the first set value calculation unit 83 determines whether there are any unprocessed voltage regulators 1 and 5 among the voltage regulators 1 and 5 included in the equipment data stored in the storage unit 88.

[0055] If there is no equipment to be processed (No in step S42), the first setting value calculation unit 83 ends the process. If there is equipment to be processed (Yes in step S42), the first setting value calculation unit 83 sets the equipment to be processed (step S43). In detail, the first setting value calculation unit 83 selects one piece of equipment to be processed from the unprocessed equipment.

[0056] Next, the first set value calculation unit 83 sets a voltage adjustment range and a voltage monitoring range (step S44). In detail, the first set value calculation unit 83 sets a voltage adjustment range and a voltage monitoring range that start from the set target equipment.

[0057] Next, the first setpoint calculation unit 83 determines whether a voltage deviation has occurred (step S45). Specifically, it determines whether the measured voltage within the voltage monitoring range has deviated from a predetermined appropriate voltage range (the range from the lower operational limit to the upper operational limit). Note that for nodes for which no measured values ​​are available, it is not possible to determine whether a deviation has actually occurred. However, the first setpoint calculation unit 83 can determine whether a voltage deviation has occurred at the most stringent point within the voltage monitoring range by reflecting the maximum voltage rise and drop values ​​for each voltage monitoring range in the maximum and minimum data stored in the memory unit 88 into the appropriate voltage range. If a voltage deviation has not occurred (No in step S45), the first setpoint calculation unit 83 repeats the process from step S42.

[0058] If a voltage deviation occurs (Yes in step S45), the first set value calculator 83 determines whether the number of consecutive voltage deviations exceeds a specified value, i.e., whether the duration of the voltage deviation exceeds a specified time (step S46). More specifically, the first set value calculator 83 manages the number of consecutive voltage deviations at each location in the power distribution system and determines whether there is a location where the number of consecutive voltage deviations exceeds a specified value. If the number of consecutive voltage deviations is equal to or less than the specified value (No in step S46), the first set value calculator 83 repeats the process from step S42.

[0059] If the number of consecutive voltage deviations exceeds a specified value (Yes in step S46), the first setting value calculation unit 83 calculates a setting value (step S47). Specifically, the first setting value calculation unit 83 calculates a setting value for the set target equipment. In order to suppress the deviation, the first setting value calculation unit 83 calculates a setting value so as to narrow the upper and lower voltage limit range from the upper and lower voltage limit range set by batch processing by the amount of deviation, and stores the calculated setting value in the storage unit 88. For example, the first setting value calculation unit 83 narrows the upper and lower voltage limit range so as to raise the lower limit when the voltage falls below the lower limit, and narrows the upper and lower voltage limit range so as to lower the upper limit when the voltage exceeds the upper limit, but the method of calculating the setting value to suppress the deviation is not limited to this example.

[0060] In this way, the first set value calculation unit 83 determines whether or not there is a voltage deviation for each measurement period using the measurement information and the estimated results of the maximum voltage rise value and maximum voltage drop value within the voltage adjustment section, and if a voltage deviation is detected for a certain period of time, corrects the set value so as to narrow the upper and lower voltage limit range by the amount of deviation.

[0061] Next, the communication unit 81 transmits the setting values ​​(step S48), and the processing from step S42 is repeated. More specifically, in step S48, the communication unit 81 transmits the setting values ​​stored in the storage unit 88, i.e., the setting values ​​calculated in step S47, to the local voltage control devices 15, 16 that control the target equipment set in step S43. In this way, in real-time processing, the first setting value calculation unit 83 monitors voltage deviations using estimated results of the maximum voltage rise and maximum voltage drop from the voltage monitoring point to the end in the current system of the distribution system for each measurement cycle, and if the voltage deviation continues for more than a specified time, updates the setting values ​​so as to suppress the voltage deviation.

[0062] 8 is a flowchart showing an example of batch processing according to this embodiment. As shown in FIG. 8, second setpoint calculation unit 86 determines whether it is time to perform batch processing (step S51). In batch processing, for example, setpoints for 48 sections for one day are created at a time for each centralized control unit, and are transmitted to each of local voltage control devices 15, 16 in groups of 24 sections every half day, although the transmission timing is not limited to this.

[0063] If it is not the timing for batch processing (No in step S51), the second setting value calculation unit 86 repeats step S51. If it is the timing for batch processing (Yes in step S51), the second setting value calculation unit 86 determines whether there is a distribution line to be processed (step S52). Specifically, the second setting value calculation unit 86 determines whether there is an unprocessed distribution line among all the distribution lines to be processed. All the distribution lines to be processed are, for example, all the distribution lines for which the ΔV calculation process has already been performed.

[0064] If there is a distribution line to be processed (Yes in step S52), the system is fixed (step S53). Specifically, the second set value calculation unit 86 selects the distribution line to be processed from among the unprocessed distribution lines, sets the selected distribution line as the current system, and sets the date and time for voltage estimation. Next, the second set value calculation unit 86 sets a voltage adjustment range (step S54). Specifically, the second set value calculation unit 86 sets a voltage adjustment range corresponding to the voltage regulator 5 in the distribution line to be processed. Next, the second set value calculation unit 86 calculates a set value (step S55), and repeats the process from step S52. In step S55, more specifically, second set value calculation unit 86 extracts the maximum voltage rise and drop values ​​for each voltage monitoring interval in the voltage regulation interval being processed for a certain period (e.g., 10 days) from the maximum and minimum data stored in memory unit 88 according to the holiday / weekday classification of the processing date and time, and estimates the maximum voltage rise and drop values ​​for each time slice for one day using the extracted results. Second set value calculation unit 86 then determines upper and lower voltage limit ranges using the estimation results and the voltage imbalance correction value in the accumulated data so that the voltage in each voltage monitoring interval falls within the upper and lower operational limit ranges, calculates each set value of voltage regulator 5 based on the determined upper and lower voltage limit ranges, and stores the calculated set values ​​in memory unit 88 as set values ​​for batch processing.

[0065] If there is no distribution line to be processed (No in step S52), the communication unit 81 transmits the setting values ​​(step S56). In particular, if there is no distribution line to be processed, the second setting value calculation unit 86 instructs the communication unit 81 to transmit the setting values ​​in the batch processing, and the communication unit 81 transmits the setting values ​​of the batch processing stored in the storage unit 88 to the corresponding local voltage control device 16 based on the instruction. For example, here, the communication unit 81 transmits half a day's worth of setting values ​​for 48 sections, and after half a day has passed, transmits the remaining 24 sections.

[0066] Next, the second set value calculation unit 86 determines whether there is an LRT (voltage regulator 1) to be processed (step S57). If there is a voltage regulator 1 to be processed (step S57 Yes), the second set value calculation unit 86 calculates the set value (step S58) and repeats the process from step S57. In step S58, more specifically, the second set value calculation unit 86 extracts the maximum voltage rise and drop values ​​corresponding to each voltage monitoring section in the voltage regulation section to be processed from the maximum and minimum data stored in the memory unit 88 according to the holiday / weekday classification of the date and time to be processed for a certain period (e.g., 10 days), and estimates the maximum voltage rise and drop values ​​for each time section for one day using the extracted results. Then, the second set value calculation unit 86 uses the estimation results to determine upper and lower voltage limit ranges so that the voltage in each voltage monitoring section falls within the upper and lower operational limit ranges, calculates set values ​​for batch processing for the voltage regulator 1 based on the determined upper and lower voltage limit ranges, and stores the calculated set values ​​in the memory unit 88.

[0067] If there is no voltage regulator 1 to be processed (No in step S57), the communication unit 81 transmits the setting values ​​(step S59) and ends the process. Specifically, the second setting value calculation unit 86 instructs the communication unit 81 to transmit the setting values ​​for the batch processing calculated in step S58, and the communication unit 81 transmits the setting values ​​for the batch processing stored in the storage unit 88 to the corresponding local voltage control device 15 based on the instruction. For example, here, the communication unit 81 transmits half a day's worth of setting values ​​for 48 sections, and after half a day has passed, transmits the remaining 24 sections.

[0068] In this way, the second setpoint calculation unit 86 estimates the voltage distribution for a certain period of time in the future using past current distribution data, the estimated results of the maximum voltage rise value and maximum voltage drop value, and the voltage imbalance correction value, sets upper and lower voltage limit ranges so that the estimated voltage does not deviate from the upper and lower operational limits, and determines the setpoint values ​​for the certain period of time using the set upper and lower limit ranges.

[0069] 9 is a flowchart showing an example of a local setting value calculation process according to this embodiment. As shown in FIG. 9, the third setting value calculation unit 87 determines whether it is time to calculate a local setting value (step S61). The local setting value is calculated, for example, after the voltage management system 8 acquires current distribution data for the local setting value and performs a ΔV calculation process corresponding to the acquired current distribution data. If it is not time to calculate a local setting value (No in step S61), the third setting value calculation unit 87 repeats step S61.

[0070] If it is time to calculate the local setting (Yes in step S61), the third setting value calculation unit 87 determines whether there is a distribution line to be processed (step S62). The distribution line to be processed is the distribution line for which the ΔV calculation process corresponding to the current distribution data for the local setting has been performed. If there is no distribution line to be processed (No in step S62), the third setting value calculation unit 87 ends the process.

[0071] If there is a distribution line to be processed (Yes in step S62), the system is fixed (step S63). Specifically, the third setting value calculation unit 87 selects one distribution line to be processed from the unprocessed distribution lines and sets the selected distribution line to the standard system. Next, the third setting value calculation unit 87 sets a voltage adjustment range (step S64). Specifically, the third setting value calculation unit 87 sets a voltage adjustment range corresponding to the voltage regulator 5 in the distribution line to be processed. Next, the third setting value calculation unit 87 calculates a setting value (step S65). Specifically, the third setting value calculation unit 87 calculates a setting value in the same manner as in batch processing, using data for calculating local setting values ​​from the maximum and minimum data stored in the memory unit 88, and stores the calculated setting value in the memory unit 88 as a local setting value. For example, the communication unit 81 may acquire first distribution data, which is current distribution data corresponding to the annual maximum load, and second distribution data, which is current distribution data corresponding to the annual maximum power generation, and perform the above-mentioned ΔV calculation process based on these data. The third setpoint calculation unit 87 may then use the maximum and minimum data calculated by this ΔV calculation process to determine local setpoints, which are setpoints for independent operation in the local voltage control devices 15 and 16, using the upper and lower limit ranges. In this manner, the voltage management system 8 may use the first distribution data and the second distribution data to set upper and lower limit ranges for voltage, and determine setpoints using the set upper and lower limit ranges. Next, the communication unit 81 transmits the setpoints (step S66). Thereafter, the process returns to step S62. In particular, if there is no distribution line to be processed, the third setpoint calculation unit 87 instructs the communication unit 81 to transmit the local setpoints. Based on the instruction, the communication unit 81 transmits the local setpoints stored in the storage unit 88 to the power distribution automation system 10.

[0072] Next, the hardware configuration of the voltage management system 8 of this embodiment will be described. In the voltage management system 8 of this embodiment, a voltage control program, which is a computer program describing the processing in the voltage management system 8, is executed on the computer system, causing the computer system to function as the voltage management system 8. FIG. 10 is a diagram showing an example of the configuration of a computer system that realizes the voltage management system 8 of this embodiment. As shown in FIG. 10, this computer system includes a control unit 101, an input unit 102, a storage unit 103, a display unit 104, a communication unit 105, and an output unit 106, which are connected via a system bus 107.

[0073] In FIG. 10 , the control unit 101 is a processor such as a CPU (Central Processing Unit) that executes a program describing the processes performed by the voltage management system 8 of this embodiment. The input unit 102 is composed of, for example, a keyboard, a mouse, and the like, and is used by a user of the computer system to input various information. The memory unit 103 includes various types of memory, such as RAM (Random Access Memory) and ROM (Read Only Memory), and a storage device, such as a hard disk, and stores programs to be executed by the control unit 101, necessary data obtained during processing, and the like. The memory unit 103 is also used as a temporary storage area for programs. The display unit 104 is composed of a display, an LCD (Liquid Crystal Display Panel), and the like, and displays various screens to the user of the computer system. The communication unit 105 is a receiver and transmitter that perform communication processing. The output unit 106 is, for example, a printer. Note that FIG. 10 is merely an example, and the configuration of the computer system is not limited to the example shown in FIG. 10 .

[0074] Here, an example of the operation of the computer system until the program of this embodiment is ready to be executed will be described. In the computer system having the above configuration, for example, a computer program is installed in storage unit 103 from a CD-ROM or DVD-ROM inserted in a CD (Compact Disc)-ROM drive or DVD (Digital Versatile Disc)-ROM drive (not shown). Then, when the program is executed, the program read from storage unit 103 is stored in the main storage area of ​​storage unit 103. In this state, control unit 101 executes processing as voltage management system 8 of this embodiment in accordance with the program stored in storage unit 103.

[0075] In the above description, a program describing the processing in the voltage management system 8 is provided on a CD-ROM or DVD-ROM as a recording medium, but this is not limited to this. Depending on the configuration of the computer system, the capacity of the program to be provided, etc., it is also possible to use a program provided via a transmission medium such as the Internet via the communication unit 105.

[0076] The system analysis unit 82, the first setpoint calculation unit 83, the stored data processing unit 84, the voltage change calculation unit 85, the second setpoint calculation unit 86, and the third setpoint calculation unit 87 shown in FIG. 3 are realized by the control unit 101 shown in FIG. 10 executing a computer program stored in the storage unit 103 shown in FIG. 10. The storage unit 103 shown in FIG. 10 is also used to realize the system analysis unit 82, the first setpoint calculation unit 83, the stored data processing unit 84, the voltage change calculation unit 85, the second setpoint calculation unit 86, and the third setpoint calculation unit 87 shown in FIG. 3. The storage unit 88 shown in FIG. 3 is a part of the storage unit 103 shown in FIG. 10. The communication unit 81 shown in FIG. 3 is realized by the communication unit 105 shown in FIG. 10. The voltage management system 8 may be realized by multiple computer systems. For example, the voltage management system 8 may be realized by a cloud computer system.

[0077] The power supply system 11, the power supply communication server 12, the power distribution automation system 10, the load curve management system 9, the comprehensive support system 13, and the SM control management system 14 are also realized by a computer system having the configuration shown in FIG. 10, for example.

[0078] As described above, in this embodiment, the voltage management system 8 acquires current distribution data calculated from the measurement values ​​of the SM 21 from the load curve management system 9, calculates batch processing setting values ​​based on the acquired current distribution data and the measurement values ​​of the automatic switchgear 6 and the voltage regulator 5, and transmits the batch processing setting values ​​to the local voltage control devices 15 and 16 that control the voltage regulators 1 and 5. This allows for accurate remote control of voltage regulators in the distribution system without the need to install new measurement devices in the high-voltage distribution system. In addition, the voltage is monitored in real time, and if a voltage deviation continues for more than a specified time, a setting value is calculated by real-time processing and transmitted to the local voltage control devices 15 and 16 that control the voltage regulators 1 and 5. This makes it possible to respond to sudden voltage fluctuations.

[0079] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or different embodiments may be combined with each other. It is also possible to omit or modify parts of the configurations as long as they do not deviate from the gist of the invention. [Explanation of symbols]

[0080] 1,5 Voltage regulator, 2 Busbar, 3-1,3-2 Circuit breaker, 4-1,4-2 Distribution line, 6 Automatic switchgear, 7 Communication network, 8 Voltage management system, 9 Load curve management system, 10 Distribution automation system, 11 Supply system, 12 Supply communication server, 13 Comprehensive support system, 14 SM control management system, 15,16 Local voltage control device, 20 Load, 21 SM, 81 Communication unit, 82 System analysis unit, 83 First setting value calculation unit, 84 Accumulated data processing unit, 85 Voltage change calculation unit, 86 Second setting value calculation unit, 87 Third setting value calculation unit, 88 Memory unit.

Claims

1. a voltage regulator connected to a distribution line in a power distribution system to control the voltage of the distribution line; a local voltage controller for controlling the voltage regulator; A meter control management system that acquires and aggregates the amount of electricity measured from metering devices that measure the amount of electricity consumed by consumers; a load curve management system that creates current distribution data in the distribution line based on the amount of power collected by the meter control management system; and a comprehensive support system for managing equipment data, which is information about equipment in the distribution line; a distribution automation system that acquires status information indicating a status of a switch connected to the distribution line and measurement information indicating measurement values ​​of a voltage and a current of the distribution line; a power supply communication server capable of communicating with a first voltage regulator, which is the voltage regulator in a distribution substation, among the voltage regulators; a voltage management system; Equipped with The voltage management system includes: acquiring the measurement information from the power distribution automation system, acquiring the current distribution data from the load curve management system, and acquiring the equipment data from the comprehensive support system; calculating a setting value corresponding to the voltage regulator using the measurement information, the current distribution data, and the equipment data; a centralized voltage control system, characterized in that the calculated setting value corresponding to the first voltage regulator is transmitted to the local voltage control device corresponding to the first voltage regulator via the power distribution automation system and the power supply communication server, and the calculated setting value corresponding to a second voltage regulator, which is a voltage regulator other than the first voltage regulator, is transmitted to the local voltage control device corresponding to the second voltage regulator via the power distribution automation system.

2. The voltage management system includes:

2. The centralized voltage control system according to claim 1, wherein the measurement information acquired at each measurement period is used to calculate a voltage imbalance correction value at each centralized control period that is longer than the measurement period.

3. The voltage management system includes:

3. The centralized voltage control system according to claim 2, wherein the current distribution data is allocated to the equipment using the equipment data, the allocation result is used to estimate maximum voltage rise and drop values ​​within a voltage regulation section that is a section corresponding to the voltage regulator, and the setting values ​​are calculated using the estimated maximum voltage rise and maximum voltage drop values.

4. The voltage management system includes:

4. The centralized voltage control system according to claim 3, wherein the voltage distribution for a certain period in the future is estimated using the past current distribution data, the estimated results of the maximum voltage rise value and the maximum voltage drop value, and the voltage imbalance correction value, upper and lower voltage limit ranges are set so that the estimated voltage does not deviate from upper and lower operational limits, and the set upper and lower limit ranges are used to determine the setting values ​​for the certain period.

5. The voltage management system includes:

5. The centralized voltage control system according to claim 4, wherein the presence or absence of a voltage deviation is determined for each measurement period using the measurement information and the estimated results of the maximum voltage rise value and the maximum voltage drop value within the voltage adjustment section, and if a voltage deviation is detected continuously for a certain period of time, the setting value is corrected so as to narrow the upper and lower voltage limit ranges by the amount of deviation.

6. The voltage management system includes: A centralized voltage control system as described in any one of claims 1 to 5, characterized in that first distribution data, which is the current distribution data corresponding to the annual maximum load, and second distribution data, which is the current distribution data corresponding to the annual maximum power generation, are obtained from the load curve management system, and upper and lower limit ranges of voltage are set using the first distribution data and the second distribution data, and setting values ​​for independent operation in the local voltage control device are determined using the set upper and lower limit ranges.

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