JP2023051028A - Voltage centralized control system - Google Patents

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

The present disclosure relates to a centralized voltage control system that controls the voltage of a power system.

Conventionally, for voltage control of distribution systems, transformer-type voltage control equipment such as LRT (Load Ratio Control Transformer: transformer with load tap changer) or SVR (Step Voltage Regulator) is used. A voltage regulator is integrated with the voltage regulator or installed side by side with the voltage control device, and the voltage is controlled in a self-sustaining distributed manner based on the measurement information of the voltage and current near the installation point of the voltage regulator. Local voltage controllers are prevalent. In addition to the above-mentioned transformer type voltage regulator, the voltage regulator may include phase modifying equipment (phase advance capacitor, shunt reactor, etc.) with a function to automatically switch between operation and non-operation, SVC (Static Var Compensator: static type invalid Reactive power control type such as power compensator) or PCS (Power Conditioning System: power conditioner) with reactive power adjustment function is known, and local voltage control devices corresponding to these voltage regulators are also known. It is in the stage of commercialization. Here, the PCS is, for example, a power conditioner for photovoltaic power generation or a storage battery, and connects the photovoltaic power generation facility or the storage battery and the power distribution system.

These local voltage control devices are constructed on the premise that the load distribution of the distribution system varies uniformly, that is, the voltage at each point of the 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, etc., the load distribution of the distribution system tends to fluctuate significantly over time. It is becoming difficult to maintain proper voltage in voltage control of distribution systems. For this reason, instead of the self-distributed voltage control system, a centralized control system has been proposed in which the voltage of the distribution system is centrally controlled in a manner that is consistent with the entire system. For example, in Patent Document 1, a centralized voltage control device collects voltage and current measurement information at multiple points in a high-voltage distribution system using a dedicated network, and adjusts each voltage based on these measurement information. It is disclosed to determine the control amount of the voltage regulator and remotely command that control amount to each voltage regulator.

Japanese Patent No. 5393934

A conventional centralized voltage control device needs to accurately grasp the state of the system in order to perform remote control with high accuracy. Therefore, voltage and current information at each point in the distribution system must be collected periodically. However, at present, such measurement information is acquired only in a small part of the distribution system, and in order to acquire measurement information for the entire distribution system, it is necessary to install a new measurement device in the high-voltage distribution system. .

The present disclosure has been made in view of the above, and provides a voltage centralized control system that can accurately remotely control a voltage regulator in a power distribution system without requiring installation of a new measuring device in the high-voltage power distribution system. With the goal.

In order to solve the above-described problems and achieve the object, the centralized voltage control system according to the present disclosure includes a voltage regulator that is connected to a distribution line in a distribution system and controls the voltage of the distribution line, and controls the voltage regulator. and a meter control management system that acquires and aggregates the power amount measured from the metering device that measures the power amount of the consumer. In addition, the centralized voltage control system includes a load curve management system that creates current distribution data on distribution lines based on the amount of power collected by the meter control management system, and an integrated system that manages facility data, which is information about facilities on distribution lines. A distribution automation system that acquires a support system, state information indicating the state of a switch connected to a distribution line, and measurement information indicating the measured values of the voltage and current of the distribution line, and a distribution substation among 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, and uses the measurement information, current distribution data, and equipment data to , calculating setting values corresponding to the voltage regulators, and assigning the setting values corresponding to the first voltage regulator among the calculated setting values to the first voltage regulator via the power distribution automation system and the distribution communication server; Transmit to the local voltage control device, and among the calculated setting values, the setting value corresponding to the second voltage regulator, which is a voltage regulator other than the first voltage regulator, is sent to the second voltage regulator via the distribution automation system. Send to the corresponding local voltage controller.

The voltage centralized control system according to the present disclosure has the effect of being able to remotely control the voltage regulator in the power distribution system with high accuracy without installing a new measuring device in the high-voltage power distribution system.

1 is a diagram showing a configuration example of a voltage centralized control system according to an embodiment and a distribution system controlled by the voltage centralized control system; FIG. FIG. 4 is a diagram showing an example of data linkage in the voltage centralized control system of the embodiment; 1 is a diagram showing a configuration example of a voltage management system according to an embodiment; FIG. Flowchart showing an example of system analysis according to the embodiment 3 is a flowchart showing an example of accumulated data processing according to an embodiment; Flowchart showing an example of ΔV calculation processing according to the embodiment 4 is a flowchart showing an example of real-time processing according to an embodiment; 4 is a flowchart showing an example of batch processing according to an embodiment; 4 is a flowchart showing an example of processing for calculating a local setting value according to an embodiment; FIG. 1 shows a configuration example of a computer system that implements a voltage management system according to an embodiment;

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

Embodiment.
FIG. 1 is a diagram showing a configuration example of a voltage centralized control system according to an embodiment and a distribution system controlled by the voltage centralized control system. In FIG. 1, a voltage regulator 1 is, for example, an LRT as a distribution transformer installed in a substation. A local voltage controller 15 is connected to the voltage regulator 1 , and the local voltage controller 15 controls the voltage regulator 1 . A local voltage controller (voltage controller) 15 can be integrated with or co-located with the voltage regulator 1, for example. The local voltage controller 15 controls the voltage regulator 1 by adjusting the control amount of the voltage regulator 1, specifically by adjusting the tap position. Also, the local voltage control device 15 has a communication function and is connected to the communication network 7 . The communication network 7 is, for example, a dedicated optical line network, and is provided for the purpose of monitoring and controlling the power distribution system.

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. As shown in FIG. The distribution lines 4-1 and 4-2 are distribution lines of a high voltage system (voltage level is 6600 V, for example).

One end of the distribution line 4-1 is connected to the bus 2 via the circuit breaker 3-1. Automatic switches 6 for measuring the voltage and current of the distribution line 4-1 are installed at a plurality of locations on the distribution line 4-1. That is, the automatic switch 6 is connected to the distribution line 4-1, opens and closes the electric circuit, has a measurement function, measures the voltage and current at the connection point, and outputs the measured value as measurement information. The measured value also includes binary state information (hereinafter referred to as SV) indicating the state of the automatic switch 6 . In the following, voltage and current measurements 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 periodically transmits measurement information to the power distribution automation system 10 via the communication network 7, for example.

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

One end of the distribution line 4-2 is connected to the bus 2 via the circuit breaker 3-2. At a plurality of locations on the distribution line 4-2, automatic switches 6 for measuring the voltage and current of the distribution line 4-2 are installed, as with the distribution line 4-1. Similarly to the distribution line 4-1, the distribution line 4-2 is also connected to the voltage regulator 5, which is an SVR. It is connected.

The distribution lines 4-1 and 4-2 are distribution lines of a high-voltage system, and although illustration is omitted, the distribution lines 4-1 and 4-2 are connected to a low-voltage system (with a voltage level of, for example, 100V to 200V) are connected. A load 20 is connected to the low voltage distribution line. Also, the load 20 is connected to a smart meter (hereinafter abbreviated as SM) 21 which is a metering device for metering the amount of electric power of the consumer. Distributed power sources such as photovoltaic power generation devices are also connected to the low-voltage distribution lines. Although FIG. 1 shows the load 20 and the SM 21 connected to the distribution line 4-2, the load 20 and the SM 21 are also connected to the distribution line 4-1 in a distributed manner such as a photovoltaic power generation device. type power supply is connected. Further, high-voltage distribution lines for supplying electric power at high voltage without conversion to low voltage may be connected to the distribution lines 4-1 and 4-2, and the load 20 and SM 21 may be connected to the high-voltage distribution lines, A distributed power supply may be connected to the high voltage distribution line. Hereinafter, unless otherwise specified, the distribution system means a high-voltage system. Also, the voltage control of the distribution system means the voltage control of the high-voltage system.

As shown in FIG. 1, a feed system (feed control) system 11, a feed system 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 referred to as , SM control management system) 14 are connected to the communication network 7 . In FIG. 1, the pay system 11, the pay system 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 the Construct a centralized voltage control system. In FIG. 1, a pay system 11, a pay system 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 an SM control management system 14 are connected to the communication network 7. However, the communication between these devices may take place via a communication network other than the communication network 7 .

The distribution automation system 10 is connected via a communication network 7 to a local voltage controller 16 and a plurality of automatic switches 6, respectively. The distribution automation system 10 receives measurement information from each automatic switchgear 6 and each local voltage controller 16 via the communication network 7 . The distribution automation system 10 transmits the received measurement information to the voltage management system 8 .

The SM control management system (meter control management system) 14 acquires measurement information indicating measured values such as electric energy measured by the SM 21 from the SM 21 via the SM communication network 22, and transmits the acquired measurement information to the communication network. 7 to the road curve management system 9. The load curve management system 9 converts the power amount, which is the measurement information of the SM 21 received from the SM control management system 14 via the communication network 7, into a current value, and uses the converted current value to obtain current distribution data in the distribution system. and transmits the generated current distribution data to the voltage management system 8 via the communication network 7 .

The feeding system 11 manages the substation in which the voltage regulator 1 is installed. The payroll communication server 12 is a communication server at a substation. The comprehensive support system 13 manages facility data indicating the connection position of each facility in the distribution system, the type of facility, the impedance, and the like. The comprehensive support system 13 transmits the facility data to the power distribution automation system 10 . The facility data is also transmitted from the power distribution automation system 10 to the voltage management system 8 . Although it is assumed here that the facility data is transmitted to the voltage management system 8 via the power distribution automation system 10 , the facility data may be transmitted from the comprehensive support system 13 to the voltage management system 8 .

The voltage management system 8 receives measurement information indicating the measurement values measured by the automatic switch 6 via the power distribution automation system 10, and is capable of coping with unexpected voltage fluctuations while suppressing the system load. , using the measurement information, calculate the voltage upper limit value and the voltage lower limit value (hereinafter also referred to as voltage upper and lower limit values) that define the target voltage range controlled by each local voltage control device 16, and determine the set value. . In this embodiment, as a method for calculating the setting value, batch processing for distributing a plurality of setting values for each centralized control cycle in advance and updating them periodically, real-time processing for updating the setting values as needed, and local setting value calculation. There are three types of processing. Here, the centralized control cycle is described as being 30 minutes, but the centralized control cycle is not limited to this. The set values are the reference voltage and dead band width. The reference voltage indicates an 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. In addition, the voltage management system 8 receives measurement information indicating measured values measured by the local voltage control device 16 from the distribution automation system 10, and adjusts the set value based on the measurement information, that is, the control result.

In batch processing, based on the past current distribution data received from the load curve management system 9, the voltage rise/drop value of the day is estimated, and the estimated result is used to calculate the set value that can maintain the proper voltage. processing. The past current distribution data is stored in the voltage management system 8 separately for weekdays and holidays, and current distribution data for a certain past period (for example, 7 days or 10 days) is used in batch processing. . In the batch processing, the set values are calculated for 48 time slices of 30 minutes each, which is the period of centralized control, per day. The transmission of the calculated set values to the respective local voltage control devices 15 and 16 is performed, for example, every half day, at a timing that does not affect the operation of the equipment in operation.

The setting of the setting value in real-time processing is performed when the setting value set in batch processing cannot be handled due to unexpected sudden voltage fluctuations due to weather changes, etc., and is a process for temporarily changing the setting value. . The voltage management system 8 constantly monitors the measurement value indicated by the measurement information of the automatic switch 6 at a monitoring cycle (measurement cycle), and real-time processing is performed when the voltage deviates from the appropriate range. Here, the monitoring period is assumed to be one minute, but the monitoring period is not limited to this.

Moreover, in the present embodiment, the voltage management system 8 also calculates a local setpoint. The local set value is, for example, a set value that is calculated based on the annual maximum load/power generation data acquired from the road curve management system 9 about once a year, and the local voltage controllers 15 and 16 operate autonomously ( This setting value is used for control when the setting values calculated by batch processing and real-time processing cannot be linked.

The voltage management system 8 commands the set values corresponding to the local voltage controllers 15 and 16 to the local voltage controllers 15 and 16 via the distribution automation system 10 and the communication network 7 . The voltage management system 8 instructs each local voltage control device 15 via the power distribution automation system 10 , the communication network 7 and the feed control communication server 12 regarding the set value corresponding to the local voltage control device 15 . Specifically, the voltage management system 8 acquires measurement information from the power distribution automation system 10, acquires current distribution data from the load curve management system 9, acquires facility data from the comprehensive support system 13, and acquires measurement information and current distribution. The data and facility data are used to calculate settings corresponding to the voltage regulator. Then, the voltage management system 8 transmits the set value corresponding to the voltage regulator 1, which is the first voltage regulator, among the calculated set values to the voltage regulator 1 via the power distribution automation system 10 and the distribution communication server 12. is transmitted to the corresponding local voltage control device 15, and among the calculated set values, the set value corresponding to the voltage regulator 5 (second voltage regulator), which is a voltage regulator other than the voltage regulator 1, is sent to the distribution automation system 10. to the local voltage controller 16 corresponding to the voltage regulator 5 via.

Each of the local voltage controllers 15 and 16 maintains the voltage between the voltage upper and lower limit values indicated by the set value based on the set value commanded by the voltage management system 8, and the voltage regulator 1, which is the control target thereof, is maintained. , 5. Each of the local voltage controllers 15 and 16 updates and sets the voltage upper limit value and the voltage lower limit value each time it receives a setting value command from the voltage management system 8 .

The local voltage control device 15 controls the voltage on the secondary side of the voltage regulator 1 based on the set value commanded by the voltage management system 8 by batch processing, within the period of the centralized control cycle in which the set value is applied. , the control amount (change amount of the tap position) of the voltage regulator 1 is adjusted in a local control cycle shorter than the central control cycle so that it falls within the voltage upper and lower limit values (within the control target voltage range) corresponding to the set value. . Here, the local control cycle is assumed to be one minute, but the local control cycle is not limited to this.

In addition, based on the set value commanded by the voltage management system 8 by batch processing, the local voltage control device 16 controls the voltage regulator 5 to be connected to the distribution system within the period of the centralized control cycle in which the set value is applied. The control amount of the voltage regulator 5 is adjusted in a local control cycle shorter than the central control cycle so that the voltage at the point in the system falls within the voltage upper and lower limits corresponding to the set value (within the control target voltage range). .

Local voltage controllers 15 and 16 immediately reflect the received set values when set values are commanded by real-time processing.

FIG. 2 is a diagram showing an example of data linkage in the voltage centralized control system of this embodiment. The voltage centralized control system includes voltage regulators 1 and 5, local voltage controllers 15 and 16, SM control management system 14, load curve management system 9, distribution automation system 10, feed control communication server 12, and a voltage management system 8 . Voltage regulator 1 is the voltage regulator at a distribution substation among voltage regulators 1 and 5 in a distribution system, and voltage regulator 5 is a voltage regulator other than the first voltage regulator (second voltage regulator). ). 2, illustration of the local voltage controllers 15 and 16 and the communication network 7 is omitted. As shown in FIG. 2 , the voltage management system 8 acquires facility data held by the comprehensive support system 13 via the power distribution automation system 10 . Also, the voltage management system 8 acquires measured values measured by the automatic switch 6 and the voltage regulator 5 via the power distribution automation system 10 as measurement information. Although not shown in FIG. 2 , data is exchanged between the voltage regulator 5 and the distribution automation system 10 via the local voltage control device 16 . Although not shown, the voltage management system 8 receives the measured value measured by the voltage regulator 1 as measurement information via the local voltage control device 15, the power distribution automation system 10, and the distribution communication server 12. may receive. The set value calculated by the voltage management system 8 is received by the voltage regulator 5 via the local voltage control device 16 (not shown) and the power distribution automation system 10 for the voltage regulator 5 . With respect to the voltage regulator 1, the set value calculated by the voltage management system 8 is supplied to the voltage regulator 1 via the local voltage control device 15 (not shown), the feed control communication server 12, and the power distribution automation system 10. received by

The power consumption, which is the measured value of the SM 21, is aggregated by the SM control management system 14, and the aggregated measured value is received by the road curve management system 9 as measurement information. The load curve management system 9 uses the aggregated measured values to create current distribution data. Current distribution data is transmitted from the load curve management system 9 to the voltage management system 8 . In this manner, data linkage is performed in each device in the voltage centralized control system.

FIG. 3 is a diagram showing a configuration example of the voltage management system 8 of this embodiment. As shown in FIG. 3, the voltage management system 8 of 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 A value calculation unit 86 , a third set value calculation unit 87 and a storage unit 88 are provided. 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 for calculating setting values of voltage regulators 1 and 5 . Although the configuration example shown in FIG. Arithmetic may be performed.

The communication unit 81 communicates with other devices via the communication network 7 . The communication unit 81 may also perform communication 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 . Further, upon receiving the measurement information from the power distribution automation system 10 , the communication unit 81 outputs the measurement information to the system analysis unit 82 and stores it in the storage unit 88 . Upon receiving the current distribution data from the load curve management system 9 , the communication unit 81 stores the received current distribution data in the storage unit 88 . In addition, the current distribution data are stored in the storage unit 88 separately for weekdays and holidays, as described above.

The system analysis unit 82 uses the measurement information received from the communication unit 81 to carry out system analysis for each monitoring cycle described later. The first setting value calculation unit 83 uses the system analysis result of the system analysis unit 82 to calculate the setting value by real-time processing, and stores the calculated setting value in the storage unit 88 . The accumulated data processing unit 84 uses accumulated information stored in the storage unit 88 to perform processing for calculating a voltage unbalance correction value, which is accumulated data. 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 voltage change values (voltage drop values, voltage rise value) is calculated, the maximum voltage rise value and the maximum voltage drop value are calculated using ΔV, and the calculation results are stored in the storage unit 88 as maximum and minimum data. The second setting value calculation unit 86 uses the maximum/minimum data stored in the storage unit 88 to calculate setting values by batch processing, and stores the calculated setting values in the storage unit 88 . The third setting value calculation unit 87 uses the maximum/minimum data stored in the storage unit 88 to calculate the setting value by the local setting value calculation process, and stores the calculated setting value in the storage unit 88 .

The set values stored in the storage unit 88 are transmitted by the communication unit 81 to the corresponding device. For example, the communication unit 81 transmits a setting value corresponding to the local voltage control device 15 (a setting value corresponding to the voltage regulator 1 ) to the local voltage via the distribution automation system 10 , the communication network 7 and the supply system communication server 12 . By transmitting to the control device 15, the local voltage control device 15 is instructed to set the set value. In addition, the communication unit 81 transmits the setting value corresponding to the local voltage control device 16 (the 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. By transmitting it, the local voltage control device 16 is instructed to set the set value.

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 according to this embodiment. The system analysis unit 82 carries out the processing shown in FIG. 4 at a monitoring cycle.

The system analysis unit 82 first acquires measurement information (measurement values) (step S11). Specifically, the measurement value is acquired by receiving the latest measurement information from the communication unit 81 . Next, the system analysis unit 82 fixes the system (step S12). Specifically, the system analysis unit 82 uses the facility data in the storage unit 88 to associate each measurement value with each facility in the distribution system of each facility, which is the automatic switch 6 or the voltage regulator 5. Assign each measurement to each piece of equipment.

Next, system analysis unit 82 performs SV analysis (step S13). Specifically, the state of each facility in the distribution system is set to the system state based on the SV among the corresponding measured values. That is, the system analysis unit 82 creates a current system for performing setpoint calculation.

Next, the system analysis unit 82 performs TM analysis (step S14) and terminates the process.

Next, accumulated data processing will be described. FIG. 5 is a flowchart showing an example of accumulated data processing according to this embodiment. The accumulated data processing unit 84 determines whether or not it is time to process the accumulated data (step S21). Here, it is assumed that the stored data processing is performed every 30 minutes in the centralized control cycle. Therefore, every time 30 minutes elapse, that is, once every 30 minutes, it is determined that it is time to process the accumulated data. If it is not the processing timing of the accumulated data processing (step S21 No), step S21 is repeated.

When it is time to process the accumulated data (step S21 Yes), 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 the period of centralized control, that is, for 30 minutes. Specifically, in step S22, the stored data processing unit 84 obtains the voltage unbalance correction value for each monitoring cycle, and averages the voltage unbalance correction values (average maximum value and the average of the minimum values). The voltage unbalance correction value is a correction value for correcting unbalance in each phase voltage. For example, as voltage imbalance correction values, V _Rmax corresponding to the maximum value (maximum value (upper)) and V _Rmin corresponding to the minimum value (maximum value (lower)) are expressed by the following equations (1) and (2), respectively. Calculated by Note that V ₁ , V ₂ and V ₃ are voltages of respective phases.
V _Rmax =V _max -V _ave (1)
V _Rmin =V _ave -V _min (2)
_Vave =( _V1 + _V2 + _V3 )/3
_Vmax = max( _V1 , _V2 , _V3 )
_Vmin = min( _V1 , _V2 , _V3 )

If the voltage monitoring location and the load side have different tap areas, the maximum and minimum values are calculated for the A side (monitoring location side) and the D side (load side), respectively. Then, the accumulated data processing unit 84 calculates the average value of the maximum values and the average value of the maximum values in units of 30 minutes. In this manner, the accumulated data processing unit 84 calculates the voltage imbalance correction value for each centralized control cycle longer than the measurement cycle using the measurement information acquired for each measurement cycle.

Next, the accumulated data processing unit 84 saves 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).

Next, the accumulated data processing unit 84 resets the accumulated information (step S24) and terminates the process. Specifically, in step S24, the accumulated data processing unit 84 resets the accumulated information by deleting the accumulated information stored in the storage unit 88 or moving it to another location.

FIG. 6 is a flowchart showing an example of ΔV calculation processing according to the present embodiment. The .DELTA.V calculation process is a process of calculating .DELTA.V of each node in the distribution system and calculating the maximum voltage rise value and the maximum voltage drop value within the voltage adjustment range and the voltage monitoring range. The voltage adjustment range is the range to be adjusted by each of the voltage regulators 1 and 5, for example, the range from the target voltage regulators 1 and 5 to the voltage regulator 5 downstream. The voltage monitoring range is, for example, a range obtained by dividing the voltage adjustment range at locations where measured values are acquired. The ΔV calculation process is performed in each of the following cases, that is, when factors corresponding to each of the following cases occur. Case #1 is when the current distribution data for the local setpoint is obtained, case #2 is when the current distribution data for batch/real time processing is obtained, and case #3 is when the SV has changed. Case #4 is when the facility data is updated (when the system is changed).

As shown in FIG. 6, the voltage change calculator 85 determines whether or not it is time to calculate ΔV (step S31). The calculation of ΔV is performed, for example, every half day when corresponding to the case #2 batch processing, and in other cases when an event causing the calculation occurs. In addition, when a time period during which ΔV is calculated is set by setting a time during which the voltage regulator 1 does not accept the set value, the voltage change calculation unit 85 does not calculate ΔV during the time period. do not If it is not the ΔV calculation timing (step S31 No), the voltage change calculator 85 repeats step S31.

If it is the ΔV calculation timing (step S31 Yes), the voltage change calculator 85 determines whether or not there is a distribution line to be processed (step S32). Specifically, the voltage change calculator 85 determines all distribution lines to be processed depending on the case as follows, and determines whether or not there is an unprocessed distribution line among all the distribution lines to be processed. do. All distribution lines to be processed are determined as follows for each case described above. In cases #1 and #2, all distribution lines of the distribution system to be managed are treated as all distribution lines. In case #3, the distribution lines whose system status has changed are treated as all distribution lines. Now, assume that the distribution lines whose system has been changed are all distribution lines to be processed.

If there is no distribution line to be processed (step S32 No), the voltage change calculator 85 terminates the process. If there is a distribution line to be processed (step S32 Yes), the voltage change calculator 85 fixes the system (step S33). Specifically, the voltage change calculation unit 85 selects the distribution line to be processed from among the unprocessed distribution lines, and the selected distribution line is the standard system in case #1, and the Set to the current system. Further, when the concentrated voltage cycle is 30 minutes, the voltage change calculator 85 sets the 48-hour section of the ΔV calculation target day corresponding to each of cases #1 to #4 as the processing target date and time. Note that, for example, in case #1, there is no ΔV calculation target day, in case #2, the ΔV calculation target day is the target date of the acquired current distribution data, and in cases #3 and #4, The ΔV calculation target days are divided into weekdays and holidays, each of which is a certain period in the past (for example, 10 days).

Next, the voltage change calculator 85 sets a voltage adjustment range and a voltage monitoring range (step S34). Next, the voltage change calculation unit 85 determines whether or not the calculation of all the time sections to be calculated has been completed (step S35). The processing from step S32 is repeated. For example, if one day is to be processed and the calculation is performed for each time section corresponding to the concentrated voltage cycle, the voltage change calculation unit 85 will calculate the total time of the calculation target when the calculation of the processing of 48 time sections is completed. It is determined that the calculation of the cross section is completed. Note that if the ΔV calculation process is not for batch processing, it is sufficient to perform the processing for the required time slice instead of the 48 time slice.

If there is a time slice for which calculation has not been performed among all time slices to be calculated (step S35 No), the voltage change calculator 85 performs load allocation (step S36). Specifically, the voltage change calculation unit 85 uses the equipment data and the current distribution data to allocate the current distribution data of the time section to be processed to each equipment of the distribution line by linking the current distribution data to each equipment.

Next, the voltage change calculator 85 calculates ΔV (step S37). Specifically, the voltage change calculation unit 85 uses the result of allocation in step S36 and the equipment data to determine ΔV at each node of the distribution line to be processed, that is, the starting point of the voltage adjustment range to which the node belongs at each node. Voltage change values from the voltage regulators 1 and 5 are calculated for each of the case of voltage rise considering power generation and the case of voltage drop not considering power generation. Next, the voltage change calculator 85 calculates and stores the maximum voltage rise value and the maximum voltage drop value (step S38), and repeats the processing from step S32. Specifically, in step S38, the voltage change calculator 85 uses the voltage change value of each node to calculate the maximum voltage rise value and the maximum voltage drop value within the voltage adjustment range and within the voltage monitoring range. The result is stored in the storage unit 88 as maximum and minimum data.

In this way, the voltage change calculation unit 85 uses the equipment data to allocate the current distribution data to the equipment, and uses the results of the allocation to determine the maximum voltage rise value in the voltage adjustment section, which is the section corresponding to the voltage regulator. and estimate the maximum voltage drop value. The estimation results of the maximum voltage rise value and the maximum voltage drop value are used for calculation of set values, which will be described later.

FIG. 7 is a flowchart showing an example of real-time processing according to this embodiment. The first set value calculator 83 determines whether or not it is time for real-time processing (step S41). Here, it is assumed that the real-time processing is performed at the monitoring cycle, that is, every minute as described above. Therefore, every time one minute elapses, i.e., once per minute, it is determined that it is time for real-time processing. The unit 83 does not perform real-time processing during this time period. If it is not the real-time processing timing (step S41 No), the first setting value calculator 83 repeats step S41.

If it is the real-time processing timing (step S41 Yes), the first setting value calculation unit 83 determines whether or not there is a facility to be processed (step S42). Specifically, the first set value calculation unit 83 calculates the unprocessed voltage regulator 1 and the voltage regulator 5 among the voltage regulators 1 and 5 included in the equipment data stored in the storage unit 88. determine whether there is

If there is no equipment to be processed (step S42 No), the first setting value calculator 83 terminates the process. If there is a facility to be processed (step S42 Yes), the first setting value calculator 83 sets the facility to be processed (step S43). Specifically, the first set value calculator 83 selects one facility to be processed from the unprocessed facilities.

Next, the first set value calculator 83 sets a voltage adjustment range and a voltage monitoring range (step S44). Specifically, the first set value calculator 83 sets a voltage adjustment range and a voltage monitoring range starting from the set processing target equipment.

Next, the first set value calculator 83 determines whether voltage deviation has occurred (step S45). Specifically, it is determined whether or not the voltage in the measured value has deviated from a predetermined appropriate voltage range (range from the lower operating limit to the upper operating limit) within the voltage monitoring range. Although it cannot be determined whether or not a deviation has actually occurred for a node for which a measured value cannot be obtained, the first setting value calculation unit 83 calculates each voltage monitoring range in the maximum and minimum data stored in the storage unit 88. By reflecting the maximum voltage rise value and maximum voltage drop value in the appropriate voltage range, it is possible to determine whether or not voltage deviation occurs at the most severe point within the voltage monitoring range. If no voltage deviation has occurred (step S45 No), the first set value calculator 83 repeats the process from step S42.

If a voltage deviation occurs (step S45 Yes), the first set value calculator 83 determines whether the number of consecutive voltage deviations exceeds a specified value, that is, whether the duration of the voltage deviation exceeds a specified time. It judges (step S46). Specifically, the first set value calculator 83 manages the number of times voltage excursions have occurred consecutively for each location in the distribution system, and checks whether there is a location where the number of times voltage excursions have occurred consecutively exceeds a specified value. determine whether or not If the number of consecutive voltage deviations is equal to or less than the specified value (step S46 No), the first set value calculator 83 repeats the processing from step S42.

If the number of consecutive voltage excursions exceeds the prescribed value (step S46 Yes), the first setting value calculator 83 calculates a setting value (step S47). Specifically, the first setting value calculator 83 calculates the setting value of the set processing target equipment. In order to suppress the deviation, a set value is calculated so that the voltage upper and lower limit range is narrowed from the voltage upper and lower limit range set by batch processing by the amount of deviation, and is stored in the storage unit 88 . For example, the first set value calculation unit 83 narrows the voltage upper/lower limit range so as to raise the lower limit when the voltage falls below the lower limit, and narrows the voltage upper/lower limit range so as to lower the upper limit when the upper limit is exceeded. The method of calculating the setting value for suppressing deviation is not limited to this example.

In this manner, the first set value calculation unit 83 uses the measurement information and the estimation result of the maximum voltage rise value and the maximum voltage drop value in the voltage adjustment section to determine whether or not there is a voltage deviation for each measurement cycle. If the voltage deviation is detected continuously for a certain period of time, the set value is corrected so as to narrow the voltage upper and lower limit range by the amount of deviation.

Next, the communication unit 81 transmits the set value (step S48), and the processing from step S42 is repeated. Specifically, in step S48, the communication unit 81 sets the setting value stored in the storage unit 88, that is, the setting value calculated in step S47, to the local voltage control device 15 that controls the processing target equipment set in step S43. , 16. In this way, in the real-time processing, the first set value calculation unit 83 uses the estimation results of the maximum voltage rise and the maximum voltage drop from the voltage monitoring point to the terminal in the current system of the distribution system for each measurement cycle. monitor the voltage excursion, and if the voltage excursion continues for a specified time or longer, the set value is updated to suppress the voltage excursion.

FIG. 8 is a flowchart showing an example of batch processing according to this embodiment. As shown in FIG. 8, the second setting value calculator 86 determines whether or not it is time for batch processing (step S51). In the batch processing, for example, the setting values for 48 cross sections for one day for each centralized control unit are created at once, and are transmitted to the local voltage controllers 15 and 16 by 24 cross sections every half day. is not limited to this.

If it is not the batch processing timing (step S51 No), the second setting value calculator 86 repeats step S51. If it is the batch processing timing (step S51 Yes), the second setting value calculator 86 determines whether or not there is a distribution line to be processed (step S52). Specifically, the second set value calculator 86 determines whether or not there is an unprocessed distribution line among all the distribution lines to be processed. All distribution lines to be processed are, for example, all distribution lines that have already undergone the ΔV calculation process.

If there is a distribution line to be processed (step S52 Yes), the system is fixed (step S53). Specifically, the second set value calculator 86 selects a distribution line to be processed from the unprocessed distribution lines, sets the selected distribution line to the current grid, and sets the date and time for voltage estimation. do. Next, the second set value calculator 86 sets the voltage adjustment range (step S54). Specifically, the second set value calculator 86 sets a voltage adjustment range corresponding to the voltage regulator 5 in the distribution line to be processed. Next, the second setting value calculator 86 calculates a setting value (step S55), and repeats the processing from step S52. More specifically, in step S55, the second set value calculator 86 calculates the maximum voltage rise value and the maximum voltage drop value corresponding to each voltage monitoring section in the voltage adjustment section to be processed for the holidays/weekdays of the processing target date and time. The maximum voltage rise value and the maximum voltage drop value of each time section for one day are extracted from the maximum and minimum data stored in the storage unit 88 according to the classification for a certain period of time (for example, 10 days). to estimate Then, the second set value calculation unit 86 uses the estimation result and the voltage unbalance correction value in the accumulated data to determine the voltage upper and lower limit ranges so that the voltage in each voltage monitoring section falls within the operational upper and lower limit ranges, Based on the determined voltage upper and lower limit ranges, each setting value of the voltage regulator 5 is calculated, and the calculated setting value is stored in the storage unit 88 as a setting value for batch processing.

When there is no distribution line to be processed (step S52 No), the communication unit 81 transmits the set value (step S56). Specifically, when there is no distribution line to be processed, the second setting value calculation unit 86 instructs the communication unit 81 to transmit the setting value in batch processing. The batch processing setpoints stored in the unit 88 are sent to the corresponding local voltage controllers 16 . For example, here, the communication unit 81 transmits half a day's worth of the setting values for 48 cross-sections, and then transmits the remaining 24 cross-sections after half a day has passed.

Next, the second set value calculator 86 determines whether or not 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 setting value calculator 86 calculates a setting value (step S58), and repeats the processing from step S57. Specifically, in step S58, the second setting value calculation unit 86 calculates the maximum voltage rise value and the maximum voltage drop value corresponding to each voltage monitoring section in the voltage adjustment section to be processed. , a fixed period (for example, 10 days) is extracted from the maximum and minimum data stored in the storage unit 88 according to the holiday/weekday classification of the processing target date and time, and each time section for one day is extracted using the extracted result. Estimate the maximum voltage rise and maximum voltage drop values. Then, the second set value calculation unit 86 uses the estimation result to determine the voltage upper/lower limit range so that the voltage in each voltage monitoring section falls within the operating upper/lower limit range, and based on the determined voltage upper/lower limit range, A setting value for batch processing for the voltage regulator 1 is calculated, and the calculated setting value is stored in the storage unit 88 .

If there is no voltage regulator 1 to be processed (step S57 No), the communication unit 81 transmits the set value (step S59), and ends the process. Specifically, the second setting value calculation unit 86 instructs the communication unit 81 to transmit the setting value in the batch processing calculated in step S58. The stored batch processing setpoints are sent to the corresponding local voltage controllers 15 . For example, here, the communication unit 81 transmits half a day's worth of the setting values for 48 cross-sections, and then transmits the remaining 24 cross-sections after half a day has passed.

In this way, the second set value calculation unit 86 uses the past current distribution data, the estimation results of the maximum voltage rise value and the maximum voltage drop value, and the voltage imbalance correction value to calculate the future voltage distribution for a certain period of time. A voltage upper and lower limit range is set so that the estimated voltage does not deviate from the operational upper and lower limits, and a set value for a certain period of time is determined using the set upper and lower limit range.

FIG. 9 is a flowchart showing an example of processing for calculating a local setpoint value according to this embodiment. As shown in FIG. 9, the third setting value calculator 87 determines whether it is time to calculate the local setting value (step S61). The calculation of the local set value is performed, for example, after the voltage management system 8 obtains current distribution data for the local set value and performs ΔV calculation processing corresponding to the obtained current distribution data. If it is not the time to calculate the local set value (step S61 No), the third set value calculator 87 repeats step S61.

If it is time to calculate the local set value (step S61 Yes), the third set value calculator 87 determines whether or not there is a distribution line to be processed (step S62). The distribution line to be processed is the distribution line on which the ΔV calculation process corresponding to the current distribution data for the local setpoint has been performed. If there is no distribution line to be processed (step S62 No), the third set value calculator 87 ends the process.

If there is a distribution line to be processed (step S62 Yes), the system is fixed (step S63). Specifically, the third set value calculator 87 selects one distribution line to be processed from the unprocessed distribution lines, and sets the selected distribution line as the standard system. Next, the third set value calculator 87 sets the voltage adjustment range (step S64). Specifically, the third set value calculator 87 sets a voltage adjustment range corresponding to the voltage regulator 5 in the distribution line to be processed. Next, the third setting value calculator 87 calculates a setting value (step S65). Specifically, the third setting value calculation unit 87 uses the data for calculating the local setting value among the maximum and minimum data stored in the storage unit 88 to calculate the setting value in the same manner as in the batch process. The setting value is stored in the storage unit 88 as a local setting value. For example, the communication unit 81 acquires first distribution data, which is current distribution data corresponding to annual maximum load, and second distribution data, which is current distribution data corresponding to annual maximum power generation. The above-described ΔV calculation processing is performed based on the above-described ΔV calculation processing, and the third set value calculation unit 87 uses the maximum and minimum data calculated by this ΔV calculation processing to determine the local voltage control devices 15 and 16 using the upper and lower limit ranges. A local setting value, which is a setting value for islanding operation in , may be determined. Thus, the voltage management system 8 may use the first distribution data and the second distribution data to set the voltage upper and lower limit ranges, and use the set upper and lower limit ranges to determine the setting value. . Next, the communication unit 81 transmits the setting value (step S66). After that, the process returns to step S62. Specifically, when there is no distribution line to be processed, the third setting value calculation unit 87 instructs the communication unit 81 to transmit the local setting value. to the distribution automation system 10 .

Next, the hardware configuration of the voltage management system 8 of this embodiment will be described. In the voltage management system 8 of the present embodiment, the computer system functions as the voltage management system 8 by executing a voltage control program, which is a computer program in which processing in the voltage management system 8 is described. . FIG. 10 is a diagram showing a configuration example of a computer system that implements the voltage management system 8 of this embodiment. As shown in FIG. 10, this computer system comprises a control section 101, an input section 102, a storage section 103, a display section 104, a communication section 105 and an output section 106, which are connected via a system bus 107. there is

In FIG. 10, a control unit 101 is a processor such as a CPU (Central Processing Unit), for example, and executes a program describing processing in the voltage management system 8 of the present embodiment. The input unit 102 is composed of, for example, a keyboard and a mouse, and is used by the user of the computer system to input various information. The storage unit 103 includes various memories such as RAM (Random Access Memory) and ROM (Read Only Memory) and storage devices such as a hard disk, and stores programs to be executed by the control unit 101 and necessary data obtained in the course of processing. store data, etc. The storage unit 103 is also used as a temporary storage area for programs. The display unit 104 includes a display, LCD (liquid crystal display panel), etc., and displays various screens to the user of the computer system. A communication unit 105 is a receiver and a transmitter that perform communication processing. The output unit 106 is a printer or the like. Note that FIG. 10 is an example, and the configuration of the computer system is not limited to the example in FIG.

Here, an operation example of the computer system until the program of the present embodiment becomes executable will be described. In the computer system having the above configuration, for example, a computer program is stored in a storage unit from a CD-ROM or DVD-ROM set in a CD (Compact Disc)-ROM drive or a DVD (Digital Versatile Disc)-ROM drive (not shown). 103 installed. 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 the present embodiment according to the program stored in storage unit 103 .

In the above description, a CD-ROM or DVD-ROM is used as a recording medium to provide a program describing processing in the voltage management system 8. However, the configuration of the computer system and the provided program are not limited to this. For example, a program provided by a transmission medium such as the Internet via the communication unit 105 may be used depending on the capacity of the computer.

The system analysis unit 82, the first setting value calculation unit 83, the accumulated data processing unit 84, the voltage change calculation unit 85, the second setting value calculation unit 86, and the third setting value calculation unit 87 shown in FIG. 10 is executed by the control unit 101 shown in FIG. To realize the system analysis unit 82, the first setting value calculation unit 83, the accumulated data processing unit 84, the voltage change calculation unit 85, the second setting value calculation unit 86, and the third setting value calculation unit 87 shown in FIG. The storage unit 103 shown in FIG. 10 is also used. Storage unit 88 shown in FIG. 3 is a part of storage unit 103 shown in FIG. The communication unit 81 shown in FIG. 3 is implemented by the communication unit 105 shown in FIG. Voltage management system 8 may be implemented by multiple computer systems. For example, voltage management system 8 may be realized by a cloud computer system.

The payroll system 11, payroll communication server 12, power distribution automation system 10, road curve management system 9, integrated support system 13, and SM control management system 14 are also realized by the computer system configured as shown in FIG. be done.

As described above, in the present embodiment, the voltage management system 8 acquires the current distribution data calculated from the measured values of the SM 21 from the load curve management system 9, and the acquired current distribution data, the automatic switch 6 and the voltage Based on the measured value of the regulator 5, the set value of batch processing is calculated and transmitted to the local voltage controllers 15 and 16 that control the voltage regulators 1 and 5. FIG. Therefore, it is possible to accurately remotely control the voltage regulator in the power distribution system without installing a new measuring device in the high-voltage power distribution system. In addition, the voltage is monitored in real time, and if the voltage deviation continues for a specified time or longer, a set value is calculated by real time processing and transmitted to the local voltage controllers 15 and 16 that control the voltage regulators 1 and 5. I made it Therefore, it is possible to cope with sudden voltage fluctuations.

The configurations shown in the above embodiments are only examples, and can be combined with other known techniques, or can be combined with other embodiments, without departing from the scope of the invention. It is also possible to omit or change part of the configuration.

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 power distribution automation system, 11 feeding system, 12 feeding communication server, 13 integrated support system, 14 SM control management system, 15, 16 local voltage control device, 20 load, 21 SM, 81 communication section, 82 system analysis section, 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 storage unit.

Claims (6)

a voltage regulator connected to a distribution line in a distribution system and controlling the voltage of the distribution line;
a local voltage controller that controls the voltage regulator;
a meter control management system that acquires and aggregates the amount of power measured from a metering device that measures the amount of power of a consumer;
a load curve management system that creates current distribution data in the distribution line based on the amount of power aggregated by the meter control management system;
a comprehensive support system for managing facility data, which is information about facilities in the distribution line;
a distribution automation system that acquires state information indicating a state of a switch connected to the distribution line and measurement information indicating measured values of voltage and current of the distribution line;
a supply control 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;
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, 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 facility data;
Among the calculated set values, the set 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 feed regulation communication server. and transmitting the set value corresponding to the second voltage regulator, which is the voltage regulator other than the first voltage regulator, among the calculated set values to the second voltage regulator via the power distribution automation system. A voltage centralized control system, characterized in that the transmission is performed to the corresponding local voltage control device. The voltage management system includes:
2. The voltage centralized control system according to claim 1, wherein the voltage imbalance correction value is calculated for each centralized control period longer than the measurement period using the measurement information acquired for each measurement period. The voltage management system includes:
Allocate the current distribution data to the equipment using the equipment data, and estimate the maximum voltage rise value and the maximum voltage drop value in the voltage regulation section, which is the section corresponding to the voltage regulator, using the results of the allocation. 3. The centralized voltage control system according to claim 2, wherein the set value is calculated using the estimation results of the maximum voltage rise value and the maximum voltage drop value. The voltage management system includes:
Using the past current distribution data, the estimation result of the maximum voltage rise value and the maximum voltage drop value, and the voltage unbalance correction value, the voltage distribution for a certain future period is estimated, and the estimated voltage is 4. The voltage concentration control according to claim 3, wherein an upper and lower limit range of the voltage is set so as not to deviate from the lower limit, and the set value for the fixed period is determined using the set upper and lower limit range. system. The voltage management system includes:
For each measurement cycle, the presence or absence of a voltage deviation is determined using the measurement information and the estimation result of the maximum voltage increase value and the maximum voltage drop value in the voltage adjustment section, and the voltage deviation continues for a certain period of time. 5. A centralized voltage control system according to claim 4, wherein, when the deviation is detected, the set value is corrected so as to narrow the upper and lower limits of the voltage by the amount of deviation. The voltage management system includes:
obtaining 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, from the load curve management system; A voltage upper and lower limit range is set using the first distribution data and the second distribution data, and a setting value for self-sustained operation in the local voltage control device is determined using the set upper and lower limit range. The centralized voltage control system according to any one of claims 1 to 5, characterized in that:

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