JP2015154522A - Voltage controller and voltage control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage controller and voltage control method capable of accurately controlling voltage in a power distribution system.SOLUTION: A voltage controller 1 comprises: a system information acquisition unit 21 for acquiring system information from a system information management system 2; a low voltage acquisition unit 22 for acquiring low voltage data from an automatic meter reading system 3 to store the data in an arithmetic information storage unit 23; a control voltage upper/lower limit determination unit 25 that determines control voltage upper/lower limit values at each point of a power distribution system by using statistical processing data generated by a low voltage statistical processing unit 24 performing statistical processing on the low voltage data, and determines control voltage upper/lower limit values on the high voltage side on the basis of the low voltage data so that a distribution range of low voltage is positioned within an upper/lower limit range of supply voltage supplied to a user load 12; and a voltage control unit 26 for controlling a voltage regulator 4 so that voltage in the power distribution system is regulated on the basis of the determined control voltage upper/lower limit values and statistical information in the arithmetic information storage unit 23, to perform voltage control of the power distribution system.

Description

  The present invention relates to a voltage control apparatus and a voltage control method for controlling a voltage of a distribution system using measurement data of a watt-hour meter.

  As part of countermeasures to environmental problems, a large amount of natural energy power sources such as photovoltaics for home use (abbreviation: PV) are being introduced. As a result, the power flow in the distribution system has become complicated, and the operation management of the distribution system is becoming difficult.

  In order to accurately grasp the state of the complicated distribution system, the distribution system in Japan has a switch equipped with sensors for measuring voltage and power flow (hereinafter sometimes referred to as “sensor-equipped switch”). Is being installed. Moreover, based on the measurement data obtained by the measurement by the sensor of the switch, the state of the entire distribution system including unmeasured points is estimated. As described above, it has been studied to improve operation management such as voltage control in the distribution system and power interchange in the event of an accident.

  Techniques for performing voltage control based on measurement data are disclosed in, for example, Patent Document 1 and Patent Document 2. In the distribution system control system disclosed in Patent Document 1, the optimum voltage control state of the voltage regulator installed in the distribution system is determined and applied based on the latest measurement data of the sensor-equipped switch. Is adopted.

  In the distribution system voltage control device disclosed in Patent Document 2, the voltage including the voltage estimation of the low-voltage system using the meter-reading power measured every 30 minutes by a smart meter that is a watt-hour meter installed in a consumer. Control is taking place.

Japanese Patent No. 3825171 JP 2012-217248 A

  In the Electricity Business Law, it is stipulated that the supply voltage to the consumer is 101 ± 6 V in terms of low voltage, and appropriate voltage control including the low voltage system is required.

  It is difficult at present to accurately manage information on low-voltage system equipment (hereinafter also referred to as “equipment information”), for example, connection phase, line length, impedance, etc., and the voltage estimation accuracy of the low-voltage system is not high. Therefore, electric power companies that are responsible for managing the power distribution system in Japan carry out voltage control by uniformly determining the amount of voltage drop expected in the low-voltage system (hereinafter sometimes referred to as “the assumed voltage drop amount”). .

  Specifically, the range obtained by subtracting the estimated voltage drop from the upper and lower limits of the supply voltage on the high-voltage system side is a range defined by the upper and lower limits of the control voltage (hereinafter referred to as “control voltage upper and lower limit range”). We are striving to maintain an appropriate voltage through voltage control. For example, the assumed voltage drop amount in the low voltage system is set to 7 V in terms of low voltage, and the upper and lower limit range of the control voltage is 103 V to 107 V in terms of low voltage.

  However, a large amount of household PV linked to the low-voltage system causes a problem that the voltage of the low-voltage system increases with the generated power. For example, when the assumed voltage drop due to consumer load and the assumed voltage rise due to PV are taken into account, the control voltage upper and lower limit range on the high voltage system side must be set narrower, and voltage control is expected to be difficult. Is done. For example, the assumed voltage increase due to PV is 2 V in terms of low voltage. In this case, the control voltage upper and lower limit range on the high voltage system side is set to 103V to 105V in terms of low voltage.

  In the central control type voltage control disclosed in the above-mentioned Patent Document 1 and the conventional local voltage control using the self-measurement data, it is necessary to set an appropriate upper and lower limit range of the control voltage by the operator as described above. It is. Depending on the accuracy of the setting, there is a risk that control will be impossible and the voltage on the low voltage side may deviate from the appropriate range.

  In order to eliminate the burden of setting an appropriate upper and lower limit range of the control voltage by the operator, in the technique disclosed in the above-mentioned Patent Document 2, the voltage based on voltage estimation integrated with high and low voltages using the meter reading electric energy of the watt-hour meter. A control method is adopted. However, as described above, it is difficult to accurately manage the facility information of the low-voltage system, and the voltage estimation accuracy of the low-voltage system is not high, and there is a concern of deviating from an appropriate voltage.

  The objective of this invention is providing the voltage control apparatus and voltage control method which can control the voltage of a power distribution system accurately.

  The voltage control device of the present invention is a voltage control device that controls the voltage of a distribution system, and from a system information management system that manages system information related to the distribution system, a system information acquisition unit that acquires the system information; A low voltage acquisition unit for acquiring the low voltage data from an automatic meter reading system that collects low voltage data representing a low voltage value in a customer load electrically connected to a low voltage distribution line on the low voltage side of the distribution system; and A calculation information storage unit that stores system information and the low-voltage voltage data, a low-voltage voltage statistical processing unit that statistically processes the low-voltage voltage data stored in the calculation information storage unit and generates statistical processing data, and the low-voltage voltage Control voltage upper and lower limit determination unit that determines upper and lower limit values of control voltage to be controlled at each point of the distribution system using statistical processing data generated by the statistical processing unit A voltage regulator to adjust the voltage of the distribution system based on the upper and lower limit values of the control voltage determined by the control voltage upper and lower limit determination unit and the statistical information stored in the calculation information storage unit And a voltage control unit that performs voltage control of the distribution system by controlling the control voltage, and the control voltage upper and lower limit determination unit supplies the distribution range of the low voltage to the consumer load based on the low voltage data The upper and lower limit values of the control voltage on the high voltage side of the distribution system are determined so as to be within the upper and lower limits of the supplied voltage.

  The voltage control method of the present invention is a voltage control method for controlling the voltage of a distribution system, wherein a system information acquisition step of acquiring the system information from a system information management system that manages system information related to the distribution system, A low voltage acquisition step for acquiring the low voltage data from an automatic meter reading system that collects low voltage data representing a low voltage value in a consumer load electrically connected to a low voltage distribution line on the low voltage side of the distribution system; and A calculation information storage step for storing system information and the low-voltage voltage data, a low-voltage voltage statistical processing step for statistically processing the low-voltage voltage data stored in the calculation information storage step and generating statistical processing data, and the low-voltage voltage Using the statistical processing data generated in the statistical processing step, the upper and lower limits of the control voltage to be controlled at each point of the distribution system Based on the control voltage upper and lower limit determination step to be determined, the upper and lower limit values of the control voltage determined in the control voltage upper and lower limit determination step, and the statistical information stored in the calculation information storage step, the distribution system A voltage control step for controlling the voltage of the power distribution system by controlling a voltage regulator so as to adjust the voltage, and in the control voltage upper and lower limit determination step, based on the low voltage data, the low voltage voltage The upper and lower limit values of the control voltage on the high voltage side of the distribution system are determined so that the distribution range is located within the upper and lower limit ranges of the supply voltage supplied to the consumer load.

  According to the voltage control apparatus of the present invention, the system information acquisition unit acquires system information about the distribution system from the system information management system, and the low voltage acquisition unit acquires the low voltage distribution on the low voltage side of the distribution system from the automatic meter reading system. Low voltage data at the customer load connected to the electric wire is acquired and stored in the calculation information storage unit. The low voltage data stored in the calculation information storage unit is statistically processed by the low voltage statistical processing unit to generate statistical processing data. The upper and lower limit values of the control voltage are determined by the control voltage upper and lower limit determination unit using the generated statistical processing data. The voltage regulator is controlled by the voltage control unit to adjust the voltage of the distribution system based on the determined upper and lower limit values of the control voltage and the statistical information stored in the calculation information storage unit. Control is performed.

  The upper and lower limit values of the control voltage on the high voltage side of the distribution system are determined based on the low voltage data so that the distribution range of the low voltage is located within the upper and lower limits of the supply voltage supplied to the consumer load. As a result, the upper and lower limits of the control voltage on the high voltage side can be appropriately set or changed based on the results of the voltage on the low voltage side, so that appropriate voltage control including the low voltage side of the distribution system can be performed. it can. Therefore, the voltage of the power distribution system can be controlled with high accuracy.

  According to the voltage control method of the present invention, in the system information acquisition step, system information regarding the distribution system is acquired from the system information management system, and in the low voltage acquisition step, the low voltage distribution on the low voltage side of the distribution system is acquired from the automatic meter reading system. Low voltage data at the customer load electrically connected to the electric wire is acquired and stored in the calculation information storage step. The low voltage data stored in the calculation information storage step is statistically processed in the low voltage statistical processing step to generate statistical processing data. Using the generated statistical processing data, the control voltage upper and lower limit values are determined in the control voltage upper and lower limit determination step. The voltage regulator is controlled in the voltage control step so that the voltage of the distribution system is adjusted based on the determined upper and lower limit values of the control voltage and the statistical information stored in the calculation information storage step. Control is performed.

  The upper and lower limit values of the control voltage on the high voltage side of the distribution system are determined based on the low voltage data so that the distribution range of the low voltage is located within the upper and lower limits of the supply voltage supplied to the consumer load. As a result, the upper and lower limits of the control voltage on the high voltage side can be appropriately set or changed based on the results of the voltage on the low voltage side, so that appropriate voltage control including the low voltage side of the distribution system can be performed. it can. Therefore, the voltage of the power distribution system can be controlled with high accuracy.

It is a block diagram which shows the structure of the power distribution system 100 containing the voltage control apparatus 1 in Embodiment 1 of this invention. It is a flowchart which shows the process sequence regarding the voltage control process of the voltage control apparatus 1 in the 1st Embodiment of this invention. It is a flowchart which shows the process sequence regarding the system | strain data acquisition process of the voltage control apparatus 1 in the 1st Embodiment of this invention. It is a flowchart which shows the process sequence regarding the low voltage data acquisition process of the voltage control apparatus 1 in the 1st Embodiment of this invention. It is a figure which shows an example of the histogram showing the low voltage distribution in a group. It is a graph which shows an example of the low voltage distribution before change of a control voltage upper and lower limit. It is a graph which shows an example of anticipation low voltage distribution after change of a control voltage upper and lower limit. It is a graph which shows the other example of the low voltage distribution before the change of a control voltage upper / lower limit value. It is a graph which shows the other example of anticipation low voltage distribution after change of a control voltage upper and lower limit. It is a block diagram which shows the structure of the power distribution system 200 containing the voltage control apparatus 1A in the 2nd Embodiment of this invention. It is a flowchart which shows the process sequence regarding the voltage control process of 1 A of voltage control apparatuses in the 2nd Embodiment of this invention. It is a figure which shows an example of the voltage control range Sc of the voltage regulator. It is a figure which shows an example of the histogram showing distribution of the variation | change_quantity of a low voltage. It is a figure which shows an example of the relationship between voltage variation | change_quantity and a control voltage upper / lower limit. It is a figure which shows an example of the relationship between the voltage and distance in the power distribution system of the premise technique of this invention. It is a figure which shows the other example of the relationship between the voltage and distance in the power distribution system of the premise technique of this invention.

<Prerequisite technology>
FIG. 15 is a diagram showing an example of the relationship between voltage and distance in the power distribution system of the base technology of the present invention. FIG. 16 is a diagram showing another example of the relationship between voltage and distance in the power distribution system of the base technology of the present invention.

  As shown in FIG. 15, the power distribution system includes a high voltage system S <b> 1 composed of the high voltage distribution line 6 and a low voltage system S <b> 2 composed of the pole transformer 7 and the low voltage distribution line 8. The pole transformer 7 is connected to the high voltage distribution line 6 and connected to the customer load 31 via the low voltage distribution line 8. A voltage regulator 4 is connected to the high voltage distribution line 6.

  The electric power business law stipulates that the supply voltage to the consumer load 31 is 101 ± 6V in terms of low voltage, that is, the supply voltage upper and lower limit width ΔVlim is 95V to 107V, and is appropriate including the low voltage system S2. Voltage control is required.

  In an electric power company responsible for managing a distribution system in Japan, voltage control is performed by uniformly setting an assumed voltage drop Vd assumed in the low voltage system S2 to, for example, 7 V in terms of low voltage. Specifically, an attempt is made to maintain an appropriate voltage by voltage control in which the range obtained by subtracting the assumed voltage drop amount Vd from the upper and lower limit range of the supply voltage on the high voltage system side is the control voltage upper and lower limit range ΔVs. In the example shown in FIG. 15, the control voltage upper and lower limit range ΔVs is 103 V to 107 V in terms of low voltage.

  However, as shown in FIG. 16, a large amount of household PV 32 connected to the low-voltage system S2 causes a problem that the voltage of the low-voltage system S2 increases with the generated power. For example, when the assumed voltage drop Vd assumed to be caused by the consumer load 31 and the assumed voltage rise Vu assumed to be caused by PV32 are taken into consideration, the control voltage upper and lower limit width ΔVs on the high voltage system S1 side is further increased. It must be set narrowly, and voltage control is expected to be difficult.

  For example, when the assumed voltage drop Vd due to the customer load 31 is 7V in terms of low voltage and the assumed voltage rise Vu due to PV32 is 2V in terms of low voltage, the control voltage upper and lower limit width ΔVs is 103V to 105V in terms of low voltage. It must be set to a very narrow range. Therefore, the voltage control apparatus of the present invention employs the configuration shown in the following embodiments.

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a power distribution system 100 including a voltage control device 1 according to Embodiment 1 of the present invention. The power distribution system 100 includes a voltage control device 1, a system information management system 2, an automatic meter reading system 3, a voltage regulator 4, a voltage control network 5, a high voltage distribution line 6, a pole transformer 7, a low voltage distribution line 8, and an electric energy. A total of 9, a customer load 12 and an automatic meter reading network 13 are provided. The voltage control apparatus 1 includes a system information acquisition unit 21, a low voltage acquisition unit 22, a calculation information storage unit 23, a low voltage statistical processing unit 24, a control voltage upper and lower limit determination unit 25, and a voltage control unit 26. The watt-hour meter 9 includes a communication slave station 10 and a measuring instrument 11.

  The voltage control device 1 is connected to the system information management system 2 and the automatic meter reading system 3. The voltage control device 1 is connected to the voltage regulator 4 via the voltage control network 5. The voltage regulator 4 is connected to the high voltage distribution line 6. A plurality of pole transformers 7 are connected to the high voltage distribution line 6. A low voltage distribution line 8 is connected to each pole transformer 7. A consumer load 12 is connected to the low voltage distribution line 8. A watt hour meter 9 is connected between the low voltage distribution line 8 and the customer load 12. The watt-hour meter 9 is connected to the automatic meter reading system 3 via the automatic meter reading network 13.

  The voltage control device 1 controls the voltage of the distribution system. The system information management system 2 manages information on a target power distribution system that is a power distribution system to be controlled by the voltage control device 1 (hereinafter sometimes referred to as “system information”). The system information includes information indicating the upper limit value and lower limit value of the control voltage, which is the voltage to be controlled at each point of the distribution system (hereinafter, may be referred to as “control voltage upper and lower limit values”), the specification and setting of the voltage regulator 4. As well as information on a list of watt-hour meters 9 belonging to the voltage compensation range of the voltage regulator 4. Here, the voltage compensation range is a range in which the voltage is compensated by adjusting the voltage by the voltage regulator 4, and may be referred to as a “voltage control range” in the following description.

  It is assumed that the upper and lower limit values of the control voltage at each point of the distribution system are set based on operating conditions. The control voltage upper and lower limit values at each point of the distribution system are, for example, an upper limit value and a lower limit value of a supply voltage that is a voltage to be supplied to the customer load 12 (hereinafter may be referred to as “supply voltage upper and lower limit value”), and It is uniquely set by the operator in consideration of the voltage change on the low voltage side.

  The system information management system 2 is connected to the voltage control device 1, specifically, the system information acquisition unit 21 of the voltage control device 1. The system information acquisition unit 21 acquires system information from the system information management system 2. System information is acquired as system data. The system information acquisition unit 21 provides the acquired system data to the calculation information storage unit 23.

  The automatic meter reading system 3 is connected to the watt hour meter 9 through the automatic meter reading network 13. The automatic meter reading system 3 collects data measured by the watt-hour meter 9 (hereinafter sometimes referred to as “measurement data”). Specifically, the automatic meter reading system 3 collects and accumulates measurement data measured by the watt hour meter 9 via the automatic meter reading network 13 at a predetermined cycle (hereinafter sometimes referred to as “meter reading cycle”). To do. The meter reading cycle is, for example, a 30 minute cycle.

  As will be described later, the watt-hour meter 9 includes the power consumption of the customer load 12 to which the watt-hour meter 9 is connected, and the low-voltage side at the interconnection point of the low-voltage distribution line 8 to which the customer load 12 is linked. The value of the low voltage which is the voltage (hereinafter, also referred to as “low voltage value”) is measured. Therefore, the measurement data of the watt-hour meter 9 includes power usage data representing the power usage of the consumer load 12 and low voltage data representing the low voltage value at the interconnection point. Specifically, the watt-hour meter 9 measures the low-voltage voltage value at the position where the measuring instrument 11 in the watt-hour meter 9 is installed in the low-voltage distribution line 8 as the low-voltage voltage value at the connection point.

  The measurement data of the watt-hour meter 9 is transmitted to the automatic meter-reading system 3 from the communication slave station 10 of the watt-hour meter 9 via the automatic meter-reading network 13 for every meter-reading period according to a predetermined schedule, for example. Collected by. The method of collecting measurement data is not limited to this. For example, the measurement data may be collected by sequentially polling the watt hour meter 9 from the automatic meter reading system 3 every meter reading cycle. In the following description, the process in which the automatic meter reading system 3 collects measurement data for each meter reading cycle may be referred to as “timed meter reading process”.

  Specifically, the automatic meter reading system 3 is connected to the low voltage acquisition unit 22 of the voltage control device 1. The low voltage acquisition unit 22 acquires low voltage data from the measurement data from the automatic meter reading system 3. The low voltage acquisition unit 22 gives the acquired low voltage data to the calculation information storage unit 23.

  The calculation information storage unit 23 stores the system data supplied from the system information acquisition unit 21, the low voltage data supplied from the low voltage acquisition unit 22, and the result processed by the voltage control device 1. The result processed by the voltage control device 1 is, for example, statistical processing data generated by statistical processing to be described later, specifically, data representing a low-voltage voltage histogram described later or data representing a low-voltage voltage change amount histogram. .

  The low voltage statistical processing unit 24 statistically processes the low voltage value based on the system data and the low voltage data stored in the calculation information storage unit 23 to generate statistical processing data. The low voltage statistical processing unit 24 gives the generated statistical processing data to the control voltage upper and lower limit determining unit 25.

  The control voltage upper / lower limit determination unit 25 determines the control voltage upper / lower limit value at each point of the target distribution system using the statistical processing data provided from the low voltage statistical processing unit 24. The control voltage upper / lower limit determination unit 25 gives the determined control voltage upper / lower limit value to the voltage control unit 26.

  The voltage control unit 26 controls the voltage regulator 4 based on the control voltage upper and lower limit values given from the control voltage upper and lower limit determination unit 25 and the system information stored in the calculation information storage unit 23 (hereinafter referred to as the voltage regulator 4). (Sometimes referred to as “control state”).

  The voltage control unit 26 is connected to the voltage regulator 4 via the voltage control network 5. The voltage control network 5 is a communication network for transmitting and receiving data between the voltage control unit 26 and the voltage regulator 4. The voltage control unit 26 gives a control command for adjusting the voltage of the distribution system to the voltage regulator 4 via the voltage control network 5. The voltage regulator 4 adjusts the voltage of the distribution system based on the control command given from the voltage control unit 26.

  The voltage regulator 4 may be any device that can adjust the voltage of the distribution system. For example, the transformer that switches the transformer tap, the phase adjusting equipment that adjusts the reactive power input amount, or the output adjustment of the active power and the reactive power. This is realized by a PV and storage battery power conditioner.

  The voltage regulator 4 is electrically connected to the high voltage distribution line 6. The high-voltage distribution line 6 electrically connects each facility of the distribution system, specifically, each facility of the high-voltage system. A pole transformer 7 is electrically connected to the high voltage distribution line 6. The pole transformer 7 is electrically connected to the low voltage distribution line 8. The low voltage distribution line 8 electrically connects each facility of the low voltage system. The pole transformer 7 transforms and links the high voltage system and the low voltage system.

  Specifically, the watt-hour meter 9 is connected to the power consumption of the customer load 12 to which the watt-hour meter 9 is connected by the measuring instrument 11 and the interconnection point of the low-voltage distribution line 8 to which the customer load 12 is linked. Measure the low voltage value. Measurement data measured by the measuring instrument 11 is given to the communication slave station 10. The communication slave station 10 transmits the measurement data given from the measuring instrument 11 to the automatic meter reading system 3 via the automatic meter reading network 13. The automatic meter reading network 13 is a communication network for transmitting and receiving data between the watt-hour meter 9 and the automatic meter reading system 3.

  In the present embodiment, the voltage control device 1, the system information management system 2, and the automatic meter reading system 3 are physically configured separately. However, these are not necessarily configured separately, and the voltage control device 1, The system information management system 2 and the automatic meter reading system 3 may be integrated and configured as one apparatus.

  In the present embodiment, the voltage control network 5 and the automatic meter reading network 13 are physically separated, but they are not necessarily separated and may be configured as the same network. .

  As described above, the system and the network configuring the power distribution system 100 need only be capable of realizing the present invention, and the physical configuration of the system and the network is not limited to the configuration illustrated in FIG.

  FIG. 2 is a flowchart showing a processing procedure related to the voltage control process of the voltage control apparatus 1 according to the first embodiment of the present invention. The voltage control method according to the embodiment of the present invention is executed by the voltage control device 1 according to the first embodiment, for example, according to the flowchart shown in FIG.

  Each process of the flowchart shown in FIG. 2 is executed by the low voltage statistical processing unit 24, the control voltage upper / lower limit determination unit 25, and the voltage control unit 26 of the voltage control apparatus 1. In the flowchart shown in FIG. 2, a case is shown in which the voltage control device 1 is activated at a control cycle stored in advance in the calculation information storage unit 23. The control cycle is a cycle determined in advance as a cycle for controlling the voltage of the distribution system, for example, a cycle of 30 minutes. When the voltage control device 1 is activated, the process proceeds to step a1.

  In step a <b> 1, the low voltage statistical processing unit 24 acquires system data and low voltage data from the calculation information storage unit 23. When the process of step a1 ends, the process proceeds to step a2.

  In step a2, the low voltage statistical processing unit 24 statistically processes the low voltage value based on the data acquired in step a1, specifically the system data and the low voltage data, and generates statistical processing data. The low voltage statistical processing unit 24 gives the generated statistical processing data to the control voltage upper and lower limit determining unit 25. Step a2 corresponds to a low voltage statistical processing step. When the process of step a2 ends, the process proceeds to step a3.

  In step a3, the control voltage upper / lower limit determination unit 25 determines the control voltage upper / lower limit value of each point of the distribution system based on the statistical processing data generated in step a2 and given from the low voltage statistical processing unit 24. . The control voltage upper / lower limit determination unit 25 gives the determined control voltage upper / lower limit value to the voltage control unit 26. The control voltage upper / lower limit determination unit 25 gives the determined control voltage upper / lower limit value to the calculation information storage unit 23 for storage. Step a3 corresponds to a control voltage upper / lower limit determination step. When the process of step a3 ends, the process proceeds to step a4.

  In step a4, the voltage control unit 26 determines the control state of the voltage regulator 4 based on the control voltage upper / lower limit value determined in step a3 and given from the control voltage upper / lower limit determination unit 25. When the process of step a4 ends, the process proceeds to step a5.

  In step a5, the voltage control unit 26 generates a control command corresponding to the control state of the voltage regulator 4 determined in step a4 and transmits the control command to the voltage regulator 4 via the voltage control network 5. The voltage control unit 26 gives the control result of the voltage regulator 4 to the calculation information storage unit 23 for storage. Step a5 corresponds to a voltage control step. When the process of step a5 ends, all processing procedures are ended.

  The system data stored in the calculation information storage unit 23 is acquired by the system information acquisition unit 21 from the system information management system 2 when the voltage control device 1 is activated at a predetermined control cycle, for example, It is stored in the calculation information storage unit 23. The system data acquisition method is not limited to this. For example, a change indicating that the system has been changed from the system information management system 2 when the equipment is updated and the system is changed to a non-standard system due to system switching etc. After the notification is transmitted to the voltage control device 1 and the voltage control device 1 receives the change notification, the system information acquisition unit 21 may acquire the latest data from the system information management system.

  The low-voltage voltage data stored in the calculation information storage unit 23 is acquired from the automatic meter reading system 3 by the low-voltage voltage acquisition unit 22 when, for example, the voltage control device 1 is activated at a predetermined control cycle. And stored in the calculation information storage unit 23. The method for acquiring the low voltage data is not limited to this. For example, in consideration of the data amount and update frequency of the low-voltage voltage data, after the scheduled meter reading process by the automatic meter reading system 3 is completed, a notification of completion of the scheduled meter reading process is transmitted from the automatic meter reading system 3 to the voltage control device 1 to You may make it acquire the newest data from the automatic meter-reading system 3 by the low voltage | pressure information acquisition part 22, after the control apparatus 1 receives completion notification.

  As described above, acquisition of the latest data of the system data and the low-voltage voltage data may be performed as appropriate based on the cooperation status with other systems, the data update frequency, and the usage status of the communication line. As shown in FIGS. 3 and 4, the process may be executed in a process flow independent of the overall process flow of the voltage control apparatus 1 shown in FIG. 2.

  FIG. 3 is a flowchart showing a processing procedure related to the system data acquisition process of the voltage control apparatus 1 according to the first embodiment of the present invention. Each process of the flowchart shown in FIG. 3 is executed by the system information acquisition unit 21. The system data acquisition process shown in FIG. 3 is started at a predetermined update cycle, and the process proceeds to step b1. The update cycle is, for example, a 30 minute cycle.

  In step b 1, the system information acquisition unit 21 acquires the latest system data from the system information management system 2. Step b1 corresponds to a system information acquisition step. When the process of step b1 ends, the process proceeds to step b2.

  In step b2, the system information acquisition unit 21 gives the latest system data acquired in step b1 to the operation information storage unit 23 and overwrites the system data stored in the operation information storage unit 23, thereby calculating the operation information. The system data stored in the storage unit 23 is updated. Step b2 corresponds to a calculation information storage step. When the process of step b2 ends, all the processing procedures are ended.

  FIG. 4 is a flowchart showing a processing procedure related to the low voltage data acquisition processing of the voltage control apparatus 1 according to the first embodiment of the present invention. Each process of the flowchart shown in FIG. 4 is executed by the low voltage acquisition unit 22. The low-voltage voltage data acquisition process shown in FIG. 4 is started at a predetermined update cycle, and proceeds to step c1. The update cycle is, for example, a 30 minute cycle.

  In step c <b> 1, the low voltage acquisition unit 22 acquires the latest low voltage data from the automatic meter reading system 3. Step c1 corresponds to a low voltage acquisition step. When the process of step c1 ends, the process proceeds to step c2.

  In step c2, the low-voltage voltage acquisition unit 22 gives the latest low-voltage voltage data acquired in step c1 to the calculation information storage unit 23 to overwrite the low-voltage voltage data stored in the calculation information storage unit 23. The low voltage data stored in the calculation information storage unit 23 is updated. Step c2 corresponds to a calculation information storage step. When the process of step c2 ends, all processing procedures are ended.

  Returning to FIG. 2, the low-voltage voltage statistical processing in step a2 is specifically executed by the low-voltage voltage statistical processing unit 24 as follows. The low-voltage voltage statistical processing unit 24 acquires a group of watt-hour meters 9 for each pole transformer 7 from the calculation information storage unit 23 and acquires low-voltage voltage data for each group of watt-hour meters 9.

  For the group of watt-hour meters 9, the system information acquisition unit 21 of the voltage control device 1 may execute a grouping process for dividing into groups. Then, the system information management system 2 is configured to execute grouping processing and manage each group.

  After acquiring the low-voltage voltage data, the low-voltage voltage statistical processing unit 24 aggregates the low-voltage voltage data for each group of the watt-hour meter 9. FIG. 5 is a diagram illustrating an example of a histogram representing a low voltage distribution within a group. The horizontal axis in FIG. 5 indicates the low voltage, and the vertical axis indicates the occurrence frequency. In FIG. 5, the distribution of the low voltage of the watt-hour meter 9 belonging to the group of the pole transformer 7 of interest for the past hour is shown.

  The low voltage value represented by the low voltage data acquired from the automatic meter reading system 3 may be an instantaneous voltage at the time of meter reading, an average voltage at the meter reading cycle, a maximum voltage, a minimum voltage, or the like. The low-voltage voltage statistical processing unit 23 aggregates all these low-voltage values for the past time of the voltage control period, that is, the start-up period in the voltage control apparatus 1, and a histogram as shown in FIG. ”).

  For example, when the voltage control apparatus 1 is activated every hour, the low voltage statistical processing unit 23 aggregates the low voltage values for the past one hour and creates a low voltage voltage histogram as shown in FIG. The low voltage statistical processing unit 23 calculates an average value and a standard deviation of the low voltage histogram together with the creation of the low voltage histogram.

  In this manner, the low-voltage voltage statistical processing unit 23 generates statistical processing data including the low-voltage voltage histogram and the average value and standard deviation of the low-voltage voltage histogram. The low voltage statistical processing unit 23 gives the generated statistical processing data to the control voltage upper and lower limit determining unit 25.

  The processing for determining the control voltage upper and lower limit values in step a3 following step a2 is specifically executed by the control voltage upper and lower limit determination unit 25 as follows. The control voltage upper / lower limit determination unit 25 determines the control voltage upper / lower limit value in the pole transformer 7 unit. The control voltage upper and lower limit determination unit 25 is the latest low voltage voltage histogram generated by the statistical processing by the low voltage statistical processing unit 24 and the current acquired from the calculation information storage unit 23, that is, the previous time, in the pole transformer 7 unit. Based on the control voltage upper and lower limit values during control, the control voltage upper and lower limit values are changed to ideal control voltage upper and lower limit values.

  6 and 7 are graphs showing an example of the low voltage distribution before and after the change of the control voltage upper and lower limit values. FIG. 6 is a graph showing an example of the low voltage distribution before the change of the control voltage upper and lower limit values. FIG. 7 is a graph showing an example of the expected low voltage distribution after the change of the control voltage upper and lower limit values. In the example shown in FIG. 6 and FIG. 7, a control in which the lower limit value Vsl of the control voltage is 103 V and the upper limit value Vsu of the control voltage is 107 V among the upper and lower limit values of the control voltage on the high voltage side without increasing the voltage due to PV. Shows the case where the low voltage distribution width ΔVmes is 99V to 109V and deviates from the supply voltage upper limit value of the supply voltage upper / lower limit range ΔVlim.

  In the example shown in FIG. 6, the supply voltage lower limit value Vlower is set to 95V, the supply voltage upper limit value Vupper is set to 107V, and the supply voltage upper / lower limit width ΔVlim is set to 12V. The low voltage distribution before the change deviates from 107V, which is the supply voltage upper limit value Vupper, by 2V to the upper limit side, but the lower limit side has a margin of 4V up to 95V which is the supply voltage lower limit value Vlower. The low voltage distribution width ΔVmes before the change is 10V from 99V to 109V, which is narrower than 12V which is the supply voltage upper / lower limit width ΔVlim, and can be dealt with by changing the control voltage upper / lower limit width ΔVs. Therefore, in FIG. 7, as an example of changing the control voltage upper and lower limit values, the control voltage upper and lower limit values Vsl and Vsu are changed according to the following formulas (1) to (3) with the same tolerance for the upper and lower limits.

  According to the equations (1) to (3), in FIG. 7, the control voltage upper and lower limit width is lowered to 3 V lower side, and the changed control voltage upper and lower limit range ΔVs ′ is set to 100 to 104 V. As a result, the expected low voltage distribution ΔVmes ′ is 96 to 106V.

  There is no limitation on the method for changing the control voltage upper / lower limit range ΔVs. For example, in order to prevent a failure due to overvoltage of the customer load 12, change to 99V to 103V to lower the 4V lower side to comply with the upper limit, and the control voltage upper / lower limit range For the purpose of changing to 103V to 105V, or extending the life of the voltage regulator 4, the control amount may be changed to 99V to 105V with the smallest amount of control. Alternatively, the control voltage upper and lower limits for the operator's own operating voltage upper and lower limits, such as setting the operating voltage upper and lower limits inside the supply voltage upper limit, may be determined.

  8 and 9 are graphs showing other examples of the low voltage distribution before and after the change of the limit voltage upper and lower limit values. FIG. 8 is a graph showing another example of the low voltage distribution before the control voltage upper and lower limit values are changed. FIG. 9 is a graph showing another example of the expected low voltage distribution after the change of the control voltage upper and lower limit values. The low voltage distribution may become a low voltage distribution range ΔVmes deviating from the supply voltage upper / lower limit range ΔVlim, as shown in FIG. 8, depending on the length of the voltage control cycle, the system configuration, the system state change, and the like. .

  In that case, for example, the control voltage upper and lower limit determination unit 25 adds or subtracts twice (2σ) the standard deviation σ to the average value Vave of the low voltage distribution range ΔVmes before the change to the low voltage distribution range ΔVmes ′ after the change. It is conceivable to limit the range (Vave ± 2σ) or the like and to speed up the control cycle. In the examples of FIGS. 8 and 9, the voltage value deviating from the lower limit side is clearly different from other voltage distribution trends, and influences such as voltage flicker and power failure are also conceivable. In addition, since voltage control may not be possible for facility formation, it is desirable to set the control voltage upper and lower limit values including cooperation with other systems such as the facility formation support system and the power failure management system.

  Next, in step a4, the voltage control unit 26 determines an appropriate control state of the voltage regulator 4 installed in the target distribution system. Specifically, based on the control voltage upper / lower limit value of the pole transformer 7 unit determined by the control voltage upper / lower limit determination unit 25, the voltage control unit 26 uses, for example, optimal power flow calculation to determine the entire distribution system. The control problem of the voltage regulator 4 is determined by solving the optimization problem with the control voltage upper and lower limits as constraints.

  The control state of the voltage regulator 4 may be determined as a set value of the voltage regulator 4. That is, the voltage control unit 26 determines an appropriate settling value of the voltage regulator 4 as an appropriate control state of the voltage regulator 4. In this case, the voltage control unit 26 compares the voltage control range before and after the change of the control voltage upper and lower limit values for each voltage regulator 4 and determines a set value such as a target voltage and a dead band. If the optimum control voltage upper and lower limit values are used, the voltage control method is not particularly limited.

  The voltage control unit 26 transmits a control command to each voltage regulator 4 via the voltage control network 5, and gives a control result to the calculation information storage unit 23 for reflection.

  As described above, according to the present embodiment, the control voltage upper and lower limit values are determined based on the low voltage value detected by the watt-hour meter 9. As a result, the upper and lower limits of the control voltage on the high voltage side can be appropriately set or changed based on the actual voltage of the low voltage system, so appropriate voltage control including the low voltage system on the low voltage side of the distribution system is performed. be able to. Therefore, the voltage of the power distribution system can be controlled with high accuracy.

  In the example shown in FIG. 8 described above, the low voltage distribution range ΔVmes ′ after the change is a range (Vave) obtained by adding / subtracting twice (2σ) the standard deviation σ to the average value Vave of the low voltage distribution range ΔVmes before the change. ± 2σ). In this way, the application range of the statistical processing data of the low voltage used to determine the upper and lower limits of the control voltage is a range (Vave ± 2σ) obtained by adding / subtracting twice (2σ) the standard deviation σ to the average value Vave of the low voltage distribution range ΔVmes. ) Based on a probabilistic index, it is possible to exclude system abnormality data such as a power failure included in the measurement value, and to determine a more appropriate control voltage upper and lower limit value.

<Second Embodiment>
In the first embodiment described above, the low voltage value measured by the watt hour meter 9 is used. However, during the meter reading cycle in the automatic meter reading system 3, the operation of the voltage regulator 4 and the change in the system state are used. The voltage on the high voltage side of the pole transformer 7 changes, and it cannot be said that the upper and lower limit values of the control voltage are determined based on the pure voltage change amount on the low voltage side. Therefore, depending on the voltage control state of the voltage regulator 4, the distribution range of the low voltage may increase and deviate from the supply voltage. Therefore, in the present embodiment, more appropriate voltage control is performed using measurement data obtained by measuring the voltage on the high voltage side.

  FIG. 10 is a block diagram showing a configuration of a power distribution system 200 including the voltage control device 1A according to the second embodiment of the present invention. The power distribution system 200 according to the present embodiment is similar in configuration to the power distribution system 100 according to the first embodiment described above, and therefore, the same reference numerals are given to the same components, and description thereof is omitted. To do.

  The power distribution system 200 according to the present embodiment includes a voltage control device 1A, a system information management system 2, an automatic meter reading system 3, a voltage regulator 4, a voltage control network 5, a high voltage distribution line 6, a pole transformer 7, a low voltage distribution. The electric wire 8, the watt-hour meter 9, the customer load 12, and the automatic meter-reading network 13 are comprised. The voltage control apparatus 1A of the present embodiment is configured by further including a high-voltage measurement value acquisition unit 27 in the configuration of the voltage control apparatus 1 of the first embodiment. The voltage regulator 4 measures a high voltage that is a voltage on the high voltage side of the connection point between the high voltage distribution line 6 and the low voltage distribution line 8.

  The high voltage measurement value acquisition unit 27 acquires data relating to the high voltage measured by the voltage regulator 4 as high voltage measurement value data. The high voltage measurement value data includes the voltage value, current value, and control state of the high voltage. The high-pressure measurement value data may be acquired, for example, by polling by the high-pressure measurement value acquisition unit 27 in a measurement cycle stored in advance in the calculation information storage unit 23, or for each measurement cycle according to a predetermined schedule. It may be acquired by transmitting high voltage measurement value data from the voltage regulator 4 to the high voltage measurement value acquisition unit 27. The acquired high-voltage measurement value data is stored in the calculation information storage unit 23 together with the system data and the low-voltage voltage data.

  FIG. 11 is a flowchart showing a processing procedure related to the voltage control process of the voltage control apparatus 1A according to the second embodiment of the present invention. Each process of the flowchart shown in FIG. 11 is executed by the low voltage statistical processing unit 24, the control voltage upper / lower limit determination unit 25, and the voltage control unit 26 of the voltage control apparatus 1A. In the flowchart shown in FIG. 11, the voltage control device 1 </ b> A is activated in the control cycle stored in advance in the calculation information storage unit 23. The control cycle is, for example, a 30 minute cycle. When the voltage control device 1A is activated, the process proceeds to step d1.

  In step d 1, the low voltage acquisition unit 22 acquires system data, low voltage data, and high voltage measurement value data from the calculation information storage unit 23. When the process of step d1 ends, the process proceeds to step d2.

  In step d2, the low voltage statistical processing unit 24 determines the change amount of the low voltage (hereinafter referred to as “low voltage change amount”) based on the data acquired in step d1, specifically the system data, the low voltage data, and the high voltage measurement value data. ”), And statistical processing data is generated. When the process of step d2 ends, the process proceeds to step d3.

  In step d3, the control voltage upper / lower limit determination unit 25 determines the control voltage upper / lower limit value of each point of the distribution system based on the statistical processing data generated in step d2 and given from the low voltage statistical processing unit 24. . The control voltage upper / lower limit determination unit 25 gives the determined control voltage upper / lower limit value to the voltage control unit 26. The control voltage upper / lower limit determination unit 25 gives the determined control voltage upper / lower limit value to the calculation information storage unit 23 for storage. When the process of step d3 ends, the process proceeds to step d4.

  In step d4, the voltage control unit 26 determines the control state of the voltage regulator 4 based on the control voltage upper / lower limit value determined in step d3 and given from the control voltage upper / lower limit determination unit 25. When the process of step d4 ends, the process proceeds to step d5.

  In step d5, the voltage control unit 26 generates a control command corresponding to the control state of the voltage regulator 4 determined in step d4 and transmits the control command to the voltage regulator 4 via the voltage control network 5. The voltage control unit 26 gives the control result of the voltage regulator 4 to the calculation information storage unit 23 for storage. When the process of step d5 is finished, all the processing procedures are finished.

  Specifically, the low-voltage voltage statistical processing in step d2 is executed by the low-voltage voltage statistical processing unit 24 as follows. The low-voltage voltage statistical processing unit 24 uses the system data, low-voltage voltage data, and high-voltage measurement value data acquired from the calculation information storage unit 23 in step d1 to change the voltage change amount ΔV from each voltage regulator 4 to the customer load 12. Specifically, each voltage regulator 4 calculates a voltage change amount ΔV up to the watt hour meter 9 belonging to the voltage control range of its own device 1A, and forms a histogram.

  FIG. 12 is a diagram illustrating an example of the voltage control range Sc of the voltage regulator 4. FIG. 12 shows a case where the first voltage regulator 4 </ b> A and the second voltage regulator 4 </ b> B are connected to the high voltage distribution line 6 as the voltage regulator 4. The 2nd voltage regulator 4B is installed in the position nearest to the terminal 6a of the high voltage distribution line 6, and the 1st voltage regulator 4A is installed in the position nearest to the terminal 6a of the high voltage wiring 6 next.

  In the example shown in FIG. 12, the pole transformer 7 connected to the high voltage distribution line 6 between the first voltage regulator 4A and the second voltage regulator 4B and the watt-hour meter 9 connected thereto are It belongs to the voltage control range Sc (4A) of the first voltage regulator 4A. Moreover, the pole transformer 7 connected to the high voltage distribution line 6 between the second voltage regulator 4B and the terminal 6a of the high voltage distribution line 6 and the watt-hour meter 9 connected thereto are provided with the second voltage adjustment. Belongs to the voltage control range Sc (4B) of the device 4B.

  FIG. 13 is a diagram illustrating an example of a histogram representing a distribution of changes in low voltage (hereinafter sometimes referred to as “low voltage change distribution”). The histogram shown in FIG. 13 represents the distribution of the voltage change amount ΔV as the low-voltage voltage change amount distribution. The low voltage statistical processing unit 24 calculates the voltage change amount ΔV up to the watt hour meter 9 belonging to the voltage control range of its own device 1A in each voltage regulator 4 as described above. Hereinafter, it may be referred to as “low voltage change histogram”.

  The low voltage statistical processing unit 24 converts the high voltage Vs on the secondary side or the connection point of the voltage regulator 4 to low voltage (Vs / 105-6600), for example, according to the following equation (4), and the converted value and power The difference from the low voltage value Vr in the quantity meter 9 is calculated as a voltage change amount ΔV.

  The low-voltage conversion ratio varies depending on the tap ratio of the pole transformer 7, and the equation (4) is a case where the tap ratio of the pole transformer 7 is high voltage 6600V / low voltage 105V. The low voltage statistical processing unit 24 appropriately converts based on the tap ratio of the pole transformer 7 of the system information stored in the calculation information storage unit 23.

  Here, since the measurement cycle differs between the high-voltage Vs at the secondary side or the connection point of the voltage regulator 4 and the low-voltage voltage value Vr at the watt-hour meter 9, the difference in the measurement standard that matches as much as possible. It is desirable to take. Considering the number of each equipment device, the measurement frequency is assumed to be high in the high voltage Vs. For example, when the high voltage Vs is an average value for 1 minute and the low voltage value Vr is an average value for 30 minutes, as the high voltage Vs, the average value Vs_ave of the high voltage Vs of the last 30 samplings from the latest is expressed by the above formula. Applies to (4).

  In addition, when the low voltage value Vr is an instantaneous value at the time of meter reading, or a maximum value or a minimum value in the meter reading cycle, the low voltage value Vr can be obtained if the acquisition time of the low voltage value Vr and the high voltage Vs can be managed. The high voltage Vs at the same time as the acquisition time is selected, and the equation (4) is applied. When the acquisition time of the high voltage Vs is unknown, the above formula (4) is applied to all the data of the high voltage Vs from the present to the past of one meter reading cycle.

  Thereafter, in step d3, the control voltage upper / lower limit determination unit 25 performs control voltage upper / lower limit determination processing. The control voltage upper / lower limit determination unit 25 uses the low voltage change histogram of the voltage control range Sc calculated for each voltage regulator 4 by the low voltage statistical processing unit 24 to calculate the control voltage upper / lower limit value of the voltage regulator 4. decide.

  FIG. 14 is a diagram illustrating an example of the relationship between the voltage change amount and the control voltage upper and lower limit values. For example, as shown in FIG. 14, the control voltage upper and lower limit determining unit 25 calculates the maximum voltage change amount, that is, the maximum voltage drop amount ΔVmax, and the minimum voltage change amount, that is, the maximum voltage increase amount ΔVmin in the low voltage change graph shown in FIG. Is subtracted from the supply voltage upper and lower limit values Vupper and Vlower to determine the control voltage upper and lower limit value of the secondary side or the connection point of the voltage regulator 4, and the control voltage upper and lower limit range ΔVs is determined.

  The method for determining the upper and lower limit values of the control voltage is not limited to this. For example, as in the first embodiment described above, the average value Vave of the low voltage distribution range ΔVmes before the change of the upper and lower limit range of the control voltage is performed. The control voltage upper and lower limit values may be determined using a range (Vave ± 2σ) obtained by adding and subtracting twice the standard deviation σ (2σ) to the control voltage, or in place of the supply voltage upper and lower limits Vupper and Vlower. The upper and lower limits of the control voltage may be determined by applying the upper and lower limits of the operating voltage.

  Finally, in step d5, the voltage control unit 26 determines the optimum control state or set value for each voltage regulator according to the control voltage upper / lower limit value set for each voltage regulator 4 by the control voltage upper / lower limit determination unit 25. Then, a control command corresponding to the determined control state or set value is transmitted via the voltage control network 5.

  As described above, according to the present embodiment, since the high voltage measurement value data measured by the voltage regulator 4 is used, the influence of the control state of the voltage regulator 4 is excluded, and the amount of voltage change up to the consumer load Can be grasped accurately. Thereby, based on the control state of the voltage regulator 4, the control voltage upper and lower limit values can be determined more accurately based on the voltage change amount up to the watt-hour meter 9. Therefore, compared with the first embodiment, the accuracy of voltage control can be improved.

  In the first and second embodiments described above, the control voltage upper and lower limit determination unit 25 performs statistical processing data of low-voltage voltage data from the time when the previous voltage control was performed to the time of the current voltage control. Is used to determine the upper and lower limits of the control voltage. Thereby, the control voltage upper and lower limit values can be determined using the latest low-voltage voltage data measured by the watt-hour meter 9. Therefore, voltage control based on the status of the distribution system on the day can be performed.

<Third Embodiment>
In the first and second embodiments described above, the control voltage upper and lower limit values are set based on the low voltage actual results at the previous time on the same day, but the change in the low voltage until the next meter reading time is not predicted. Even if the maximum low voltage distribution width or the low voltage change width at the previous time is used, there is a possibility that the upper and lower limit values of the control voltage are not appropriate.

  Therefore, in the present embodiment, the change of the low voltage until the next control cycle is predicted using the past date data of the low voltage statistical processing unit 24.

  The power distribution system including the voltage control apparatus according to the present embodiment is similar in configuration to the power distribution system 100 according to the first embodiment and the power distribution system 200 according to the second embodiment. Are omitted, and the same components are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the low voltage statistical processing unit 24 uses past statistical processing data to predict a change in the low voltage. Past statistical processing data is stored in advance in the low voltage statistical processing unit 24. It is assumed that the past number of days to be processed in the low-voltage voltage statistical processing unit 24 (hereinafter sometimes referred to as “target past number of days”) is stored in the calculation information storage unit 23.

  The low-voltage voltage statistical processing unit 24 acquires the target past days from the calculation information storage unit 23, and acquires low-voltage voltage statistical processing data from the present to the next control cycle for the target past days. For example, when the target number of past days is 5 days, the control cycle is a 30-minute cycle, and the current time is 12:00, the low-voltage voltage statistical processing unit 24 sets the past 5 days from 12:00 to 12 The result of the low-voltage voltage statistical processing for 30 minutes is acquired.

  The result of the low-voltage voltage statistical processing is a low-voltage voltage histogram when the configuration is the same as that of the power distribution system 100 of the first embodiment, and the power distribution system 200 of the second embodiment described above. In the case of the same configuration, a low voltage change amount histogram is obtained.

  The low-voltage voltage statistical processing unit 24 aggregates the histograms of the past days acquired as described above. When the low-voltage voltage statistical processing unit 24 has the same configuration as that of the distribution system 100 according to the first embodiment described above, the predicted low-voltage voltage histogram When the configuration is the same as that of the power distribution system 200 according to the second embodiment described above, the control voltage upper / lower limit determination unit 25 is provided as a predicted low-voltage voltage change amount histogram. As a result, the control voltage upper / lower limit determination unit 25 can set the control voltage upper / lower limit value predicting the change of the low voltage until the next control cycle.

  As described above, according to the present embodiment, the control voltage upper and lower limit determination unit 25 performs statistical processing data of low voltage data measured in the past by the watt-hour meter 9, that is, the next voltage from the current voltage control time. The control voltage upper and lower limit values are determined using a predicted low-voltage voltage histogram or a predicted low-voltage voltage change amount histogram, which is statistical data in which changes in low-voltage voltage data up to the control time are predicted. Thereby, based on the past results, it is possible to obtain the control voltage upper and lower limit values that predict the change in the low voltage until the next control cycle. Therefore, the accuracy of voltage control can be improved.

  In the power distribution system of the present embodiment, past statistical processing data is stored in the calculation information storage unit 23 with a distinction between weekdays, holidays or holidays, and seasons. It is also possible to select the data for the past 5 days of the weekday or the data for the past 5 days of the summer holiday to create a predicted low voltage voltage histogram or a predicted low voltage voltage change amount histogram.

  In addition, the power distribution system according to the present embodiment distinguishes the past statistical processing data from the weather forecast and solar radiation data and stores the weather conditions in the calculation information storage unit 23, and the current weather forecast and current solar radiation amount. May be configured to select past days based on weather conditions.

  Thus, the prediction accuracy can be improved by selecting past data having similar trends.

  The present invention can be freely combined with each embodiment within the scope of the invention. In addition, any component in each embodiment can be changed or omitted as appropriate.

  1 Voltage control device, 2 system information management system, 3 automatic meter reading system, 4 voltage regulator, 5 voltage control network, 6 high voltage distribution line, 7 pole transformer, 8 low voltage distribution line, 9 watt hour meter, 10 communicator Station, 11 Measuring instrument, 12 Customer load, 13 Automatic meter reading network, 21 System information acquisition unit, 22 Low voltage acquisition unit, 23 Calculation information storage unit, 24 Low voltage statistical processing unit, 25 Control voltage upper / lower limit determination unit, 26 Voltage control unit, 27 High voltage measurement value acquisition unit, 100, 200 Distribution system.

Claims (6)

A voltage control device for controlling the voltage of the distribution system,
From a grid information management system that manages grid information related to the distribution system, a grid information acquisition unit that acquires the grid information;
From an automatic meter reading system that collects low voltage data representing a low voltage value in a customer load electrically connected to a low voltage distribution line on the low voltage side of the distribution system, a low voltage acquisition unit that acquires the low voltage data;
A calculation information storage unit for storing the system information and the low-voltage voltage data;
Low-voltage voltage statistical processing unit that statistically processes the low-voltage voltage data stored in the calculation information storage unit, and generates statistical processing data;
Using the statistical processing data generated by the low voltage statistical processing unit, a control voltage upper and lower limit determination unit that determines upper and lower limit values of the control voltage to be controlled at each point of the distribution system,
Based on the upper and lower limit values of the control voltage determined by the control voltage upper and lower limit determination unit and the statistical information stored in the calculation information storage unit, a voltage regulator is adjusted to adjust the voltage of the distribution system A voltage control unit that performs voltage control of the distribution system by controlling,
The control voltage upper and lower limit determining unit
Based on the low voltage data, the upper and lower limit values of the control voltage on the high voltage side of the distribution system are set such that the distribution range of the low voltage is located within the upper and lower limits of the supply voltage supplied to the consumer load. A voltage control device characterized by determining. A high voltage measurement value acquisition unit that acquires high voltage measurement value data measured by the voltage regulator,
The low-voltage voltage statistical processing unit statistically processes a voltage change amount from the voltage regulator to the consumer load based on the high-voltage measurement value data and the low-voltage voltage data, and generates statistical processing data,
2. The voltage control according to claim 1, wherein the control voltage upper and lower limit determination unit determines upper and lower limit values of the control voltage using the statistical processing data generated by the low voltage statistical processing unit. apparatus.   The control voltage upper / lower limit determination unit determines the control voltage upper / lower limit value using the statistical processing data of the low-voltage voltage data from the time when the previous voltage control was performed to the current voltage control time. The voltage control apparatus according to claim 1, wherein the voltage control apparatus is a voltage control apparatus.   The control voltage upper / lower limit determination unit determines the control voltage upper / lower limit value using statistical data in which a change in the low-voltage voltage data between a current voltage control time and a next voltage control time is predicted. The voltage control apparatus according to claim 1, wherein the voltage control apparatus is a voltage control apparatus.   5. The control voltage upper / lower limit determination unit limits an application range of statistical processing data of the low-voltage voltage used for determining the control voltage upper / lower limit value based on a probabilistic index. The voltage control apparatus as described in any one. A voltage control method for controlling the voltage of a distribution system,
From a grid information management system that manages grid information related to the distribution system, a grid information acquisition step for acquiring the grid information;
A low voltage acquisition step for acquiring the low voltage data from an automatic meter reading system that collects low voltage data representing a low voltage value in a consumer load electrically connected to a low voltage distribution line on the low voltage side of the distribution system;
A calculation information storage step for storing the system information and the low voltage data,
Low-voltage voltage statistical processing step for statistically processing the low-voltage voltage data stored in the calculation information storage step and generating statistical processing data;
Using the statistical processing data generated in the low voltage statistical processing step, a control voltage upper and lower limit determination step for determining upper and lower limits of the control voltage to be controlled at each point of the distribution system,
Based on the upper and lower limit values of the control voltage determined in the control voltage upper and lower limit determination step and the statistical information stored in the calculation information storage step, a voltage regulator is adjusted to adjust the voltage of the distribution system A voltage control step for performing voltage control of the distribution system by controlling,
In the control voltage upper and lower limit determination step,
Based on the low voltage data, the upper and lower limit values of the control voltage on the high voltage side of the distribution system are set such that the distribution range of the low voltage is located within the upper and lower limits of the supply voltage supplied to the consumer load. A voltage control method characterized by determining.

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