JP6478588B2 - Voltage control device and voltage measurement device - Google Patents

Description

  The present invention relates to a voltage control device and a voltage measurement device that control a voltage control device that controls the voltage of a distribution system.

  The power distribution system is generally composed of a high-voltage system and a low-voltage system, and the receiving end of general consumers is connected to this low-voltage system. Electric power companies are obliged to maintain the voltage at the receiving end of general consumers within an appropriate range. As an example, in the case of receiving power of 100V, it is obliged to maintain the voltage at 95V to 107V. For this reason, the electric power company intends to maintain the voltage at the power receiving end of the general consumer by adjusting the control amount of the voltage control device connected to the high voltage system. In the following, unless otherwise specified, the power distribution system refers to a high voltage system.

  In recent years, with the diversification of usage of electricity and the spread of distributed power sources such as solar power generation, the load distribution of the distribution system tends to fluctuate greatly over time. Only voltage and current information measured by voltage control devices Therefore, it has become difficult to estimate the voltage status of the entire distribution system, and maintaining an appropriate voltage has become an issue.

  Patent Document 1 discloses a technique for maintaining an appropriate voltage at a low cost without requiring a high-speed communication network. In the technique described in Patent Document 1, a small amount of information is transmitted and received between a plurality of voltage control devices, and an appropriate voltage is maintained by realizing a cooperative operation between the voltage control devices.

International Publication No. 2013/149555

  When there is a sudden change in the power supplied from the distributed power source to the system, the voltage of the distribution system also changes abruptly. In the future, the distributed power sources connected to the power distribution system will be diversified, and the number of distributed power sources connected to the power distribution system will also increase. It is expected that the rapid change in the voltage of the power distribution system will increase. On the other hand, in the technique described in Patent Document 1, since it is determined whether or not the measured voltage is within the range of the appropriate voltage, it cannot cope with a sudden change, and the voltage of the distribution system deviates from the appropriate range. there is a possibility.

  This invention is made in view of the above, Comprising: It aims at obtaining the voltage control apparatus which can suppress generation | occurrence | production of the deviation from the appropriate range of the voltage of a distribution system at the time of the sudden change of the voltage of a distribution system. .

In order to solve the above-described problems and achieve the object, the present invention provides a target voltage in a distribution system voltage control system including a plurality of voltage control devices connected to a distribution line of a high-voltage system and controlling the voltage of the distribution line. A voltage control device that controls the voltage control device so that the voltage is maintained within a range between an upper limit value and a target voltage lower limit value, and uses a voltage and active power measured by the voltage control device, and unit time Fluctuation calculation for calculating a first predicted value that is a predicted value of the maximum fluctuation amount on the positive side of the per unit voltage and a second predicted value that is a predicted value of the maximum fluctuation amount on the negative side of the voltage per unit time And when the value obtained by adding the first predicted value to the voltage measured by the voltage control device exceeds an appropriate voltage upper limit value, or the second predicted value is determined from the voltage measured by the voltage control device. Subtracted A target voltage change request information generating unit for generating target voltage change request information for requesting a change in the target voltage upper limit value and the target voltage lower limit value of another voltage control device when the target voltage lower limit value is lower than the appropriate voltage lower limit value; Using a communication processing unit that transmits voltage change request information to a voltage control device other than its own device, and the voltage and active power measured by the voltage control device, the amount of change in active power per unit time is calculated. A conversion coefficient calculation unit that calculates a conversion coefficient for conversion to a voltage fluctuation amount, and the fluctuation calculation unit is measured using the active power per unit time measured by the voltage control device. The first maximum value that is the maximum value within a certain period of the absolute value of the change amount when the active power increased from the previously measured active power, and the measured active power is the last measured active power A second maximum value that is the maximum value within the predetermined period of the absolute value of the amount of change when the first prediction value is decreased, and a value obtained by multiplying the first maximum value by the conversion coefficient is the first prediction. It is calculated as a value, and a value obtained by multiplying the second maximum value by the conversion coefficient is calculated as the second predicted value .

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that generation | occurrence | production of the deviation from the appropriate range of the voltage of a distribution system can be suppressed at the time of the sudden change of the voltage of a distribution system.

The figure which shows the structural example of the distribution system voltage control system concerning embodiment of this invention The figure which showed an example of composition of a cooperation type voltage measuring device The figure which shows an example of the time change of the active power which PCS which converts regenerative power into alternating current power outputs The figure which shows an example of the time change of the active power which PCS connected to a solar cell outputs The figure which showed an example of composition of a cooperation type voltage control device Flow chart showing an example of a processing procedure for predicting a fluctuation range at the time of sudden voltage change The flowchart which shows an example of the process sequence of issue of target voltage change request information The figure which shows the concept of the voltage change when voltage average value + (DELTA) Vmax exceeds an appropriate voltage upper limit. The flowchart which showed the process of the target voltage change by the cooperative voltage control apparatus which received the target voltage change request information A diagram showing an example of a communication path between a cooperative voltage measuring device and a cooperative voltage control device, that is, a logical network Diagram showing an example of communication between cooperative voltage control devices

  Hereinafter, a voltage control device and a voltage measurement device according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a distribution system voltage control system according to an embodiment of the present invention. In FIG. 1, a distribution transformer 1 is installed in a substation, for example, and an LRT (Load Ratio Control Transformer) as a distribution transformer that can change a secondary side voltage with a load current flowing. And a voltage control device for controlling the LRT by adjusting the tap position of the LRT.

  A bus 29 is connected to the secondary side of the distribution transformer 1, and the distribution line 2 is connected to the bus 29. The distribution line 2 is a high voltage distribution line of a high voltage system. The voltage level of the high voltage system is usually 6600V. One end of the distribution line 2 is connected to the bus 29 via the circuit breaker 3. In FIG. 1, only one distribution line 2 is drawn to be connected to the bus 29 for the sake of simplicity. Usually, there are a plurality of distribution lines connected to the bus on the secondary side of the distribution transformer. Each of the plurality of distribution lines can be similarly configured.

  Moreover, the distribution line 102 of the feeder system which is a direct current system has one end connected to a bus (not shown) via the circuit breaker 101. Regenerative power is supplied to the distribution line 102 of the feeder system by deceleration of the trains 103 and 104. In addition, in FIG. 1, the regenerative electric power supplied to the distribution line 102 from the train 103,104 is shown typically, and the actual connection form of the actual train 103,104 and the distribution line 102 is not shown. The regenerative power is used in trains that are powered in the feeder system, but the surplus power that cannot be used in the feeder system is via a PCS (Power Conditioning System) 105 for regeneration, Supplied to the distribution line 2. FIG. 1 shows an example in which the train 104 is decelerating and the train 103 is powering. In this example, the regenerative power generated by the deceleration of the train 104 is used in the train 103, and the surplus regenerative power is supplied to the distribution line 2 via the PCS 105 for regeneration.

  A cooperative voltage measuring device (CVS: Cooperative Voltage Sensor) 8, 10, 17, 21 is connected to the distribution line 2. The cooperative voltage measuring devices 8, 10, 17, and 21 can measure voltages at their respective installation locations, that is, their own ends. In the present embodiment, the voltage control of the distribution system is performed using only the voltage measurement value without using the current measurement value. This is because, due to the spread of distributed power sources such as photovoltaic power generation in recent years, the current measurement value may become very small depending on the measurement point, and the current measurement value may contain a very large error. It is. The cooperative voltage measuring devices 8, 10, 17, and 21 are connected to the communication network 30 via the network cable 31.

  The distribution line 2 is connected with a voltage drop compensation SVR (Step Voltage Regulator) 6 as a voltage control device. The SVR 6 is connected to a cooperative voltage controller (CVC) 7 that controls the SVR 6. The cooperative voltage control device 7 is configured integrally with or provided with the SVR 6. The cooperative voltage controller 7 controls the SVR 6 by adjusting the control amount of the SVR 6, specifically by adjusting the tap position. The SVR 6 measures the voltage and active power at the installation location of the distribution line 2, that is, at its own end. The cooperative voltage control device 7 is connected to the communication network 30 via the network cable 31.

  For example, a static var compensator (SVC) 22 is connected to the distribution line 2 as a voltage control device. The SVC 22 is connected to a cooperative voltage controller (CVC) 23 that controls the SVC 22. The cooperative voltage control device 23 is configured integrally with or attached to the SVC 22. The cooperative voltage controller 23 controls the SVC 22 by adjusting the control amount of the SVC 22, specifically by adjusting the reactive power output. The SVC 22 measures the voltage and active power at the installation location of the distribution line 2, that is, at its own end. The cooperative voltage controller 23 is connected to the communication network 30 via the network cable 31.

  A switch 15 is provided on the line of the distribution line 2. When the switch 15 is closed, the upstream side of the switch 15 of the distribution line 2, that is, the side where the distribution transformer 1 is located and the downstream side, that is, the load side are electrically connected. When 15 is open, the downstream side is disconnected from the upstream side. A connection control device (CC: Connection Controller) 16 is connected to the switch 15. The connection control device 16 is connected to the communication network 30 via the network cable 31. The connection control device 16 interrupts communication between the cooperative voltage control devices 12 and 19 to be described later when the switch 15 is open, but the cooperative voltage control devices 12 and 19 when the switch 15 is closed. Relay communication between them. That is, the connection control device 16 has a function of blocking communication and a function of relaying, and reflects the open / close state of the switch 15 in the communication path between the cooperative voltage control devices 12 and 19.

  A distribution line 32 having a lower voltage than the distribution line 2 is connected to the distribution line 2 via the transformer 4, and a cooperative voltage measuring device 9 that measures voltage and active power is connected to the distribution line 32. . The distribution line 32 is a low-voltage distribution line having a voltage level of 100V to 200V. The cooperative voltage measurement device (CVS) 9 is connected to the communication network 30 via the network cable 31. A load 5 is connected to the distribution line 32. There is also a transformer 4 that is connected to the load 5 without being connected to the distribution line 32 and the cooperative voltage measuring device 9.

  A distribution line 33 having a lower voltage than the distribution line 2 is connected to the distribution line 2 via the transformer 14. For example, a power conditioner (PCS) 11 for photovoltaic power generation as a voltage control device is connected to the distribution line 33. The PCS 11 is connected to a cooperative voltage controller (CVC) 12 that controls the PCS 11 and a solar cell (PV: Photovoltaics) that is a power generation source. The cooperative voltage control device 12 is configured integrally with or attached to the PCS 11. The cooperative voltage controller 12 controls the PCS 11 by adjusting the control amount of the PCS 11, specifically by adjusting the reactive power output by the PCS 11. The PCS 11 measures, for example, voltage and active power at its own end where the distribution line 33 is installed. The cooperative voltage controller 12 is connected to the communication network 30 via the network cable 31.

  A distribution line 34 having a lower voltage than the distribution line 2 is connected to the distribution line 2 via a transformer 24. For example, a power conditioner (PCS) 18 for photovoltaic power generation as a voltage control device is connected to the distribution line 34. The PCS 18 is connected to a cooperative voltage controller (CVC) 19 that controls the PCS 18 and a solar cell that is a power generation source. The cooperative voltage control device 19 is configured integrally with or attached to the PCS 18. The cooperative voltage control device 19 controls the PCS 18 by adjusting the control amount of the PCS 18, specifically, adjusting the reactive power output by the PCS 18. The PCS 18 measures, for example, voltage and active power at the installation location of the distribution line 34, that is, at its own end. The cooperative voltage controller 19 is connected to the communication network 30 via the network cable 31.

  As described above, the regeneration PCS 105 converts the DC power input from the distribution line 102 of the feeder system into AC power and supplies it to the distribution line 2. The PCS 105 is connected to a cooperative voltage controller (CVC) 106 that controls the PCS 105. The cooperative voltage control device 106 is configured integrally with or attached to the PCS 105. The cooperative voltage control device 106 can control the PCS 105 by adjusting the control amount of the PCS 105, specifically by adjusting the reactive power output by the PCS 105. The PCS 105 measures the voltage and active power at the installation location of the distribution line 34, that is, at its own end. The cooperative voltage controller 106 is connected to the communication network 30 via the network cable 31.

  The SVR 6 and the cooperative voltage control device 7 include the PCS 11 and the cooperative voltage control device 12, the PCS 18 and the cooperative voltage control device 19, the SVC 22 and the cooperative voltage control device 23, and the cooperative voltage measurement devices 8, 9, It is arranged on the power source side, that is, upstream from 10, 17, and 21. Further, FIG. 1 shows that the load 5 is connected to the distribution line 2 via the transformer 4.

  FIG. 1 shows an example of the arrangement configuration of the cooperative voltage control device. Generally, two or more voltage control devices and two or more cooperative voltage control devices for controlling each of them are arranged. 1 or more voltage control devices, one or more cooperative voltage control devices for controlling each of them, and one or more cooperative voltage measurement devices may be arranged as shown in FIG. It is not limited to the configuration. A transformer-type voltage control device has a voltage control characteristic that raises and lowers the voltage on the load side uniformly by changing the tap position, but hardly raises or lowers the voltage on the power supply side. The reactive power adjustment type voltage control device controls the reactive power supplied to the distribution line to raise and lower the voltage on the load side uniformly, and the power supply side is proportional to the line impedance from the distribution transformer 1. Has voltage control characteristics that raise and lower the voltage.

  1 shows an example in which the network is connected to the communication network 30 via the network cable 31, but the cooperative voltage measuring devices 8, 10, 17, 21 and the cooperative voltage control devices 7, 12, 19, 23 and the connection control device 16 may be connected to the communication network 30 via a wireless line, and the adjacent cooperative voltage measuring devices 8, 10, 17, 21 and the cooperative voltage control device 7 directly adjacent to each other via the wireless line. , 12, 19, 23 and the connection control device 16 may be communicated.

  In the above description, the cooperative voltage measurement devices 8, 10, 17, and 21 and the cooperative voltage control devices 7, 21, 19, and 23 measure voltage and active power. , 10, 17, and 21 and cooperative voltage control devices 7, 12, 19, and 23 may measure current and the like in addition to voltage and active power. Moreover, the voltage level of the high voltage distribution line and the voltage level of the low voltage distribution line described above are examples, and are not limited to the above numerical values.

  As shown in FIG. 1, when regenerative power is supplied from the feeder system to the distribution line 2, instantaneous and large regenerative power is supplied to the distribution line 2 when the train decelerates. In order to effectively utilize the regenerative power, it is desirable that the regenerative PCS 105 regenerates the active power to the rated capacity limit without supplying reactive power to the distribution line 2. At this time, since the voltage of the distribution line 2 rapidly rises, it is desirable that the voltage of the distribution line 2 is appropriately lowered in advance so that the voltage does not deviate from the appropriate range even when a sudden rise occurs.

  On the other hand, in power generation using solar cells, the amount of power generation varies with time. Abrupt changes may occur in the amount of power generated by solar cells, and when such changes occur, the voltage of the distribution line 2 is appropriately lowered or raised in advance so that the voltage does not deviate from the appropriate range. It is desirable to keep it.

  For this reason, in this embodiment, the fluctuation range, that is, the fluctuation amount due to the sudden change of the active power due to the supply of regenerative power and the fluctuation of the generated power amount is predicted, and the fluctuation amount of the voltage that is predicted using the predicted fluctuation amount, that is, voltage Obtain the predicted value of the amount of fluctuation. By making adjustments in advance through cooperative control, the occurrence of deviations in the appropriate range is suppressed during sudden voltage changes. Hereinafter, cooperative control of voltage according to the present embodiment will be described.

  The cooperative voltage control devices 7, 12, 19, 23, and 106 are voltage control devices that control voltages in cooperation with other devices in the distribution system voltage control system.

  Next, the configuration of the cooperative voltage measuring devices 8, 9, 10, 17, 21 will be described. In the following, the cooperative voltage measuring device 8 will be described, but the same applies to the cooperative voltage measuring devices 9, 10, 17, and 21. The cooperative voltage measurement device 8 can measure voltage and active power, perform calculation and monitoring using the voltage and active power, and generate and transmit target voltage change request information described later. Hereinafter, the target voltage change request information is abbreviated as a request as appropriate. Here, the measurement is to measure the voltage and active power at its own end, and the calculation using the voltage and active power will be described later. The monitoring is to monitor whether the voltage is within an appropriate range based on the measurement result of the voltage and active power and the calculation result using the voltage and active power.

  FIG. 2 is a diagram illustrating an example of the configuration of the cooperative voltage measurement device 8. As shown in FIG. 2, the cooperative voltage measurement device 8 monitors a voltage and active power measured by the measurement unit 40 that measures voltage and active power, a communication processing unit 41 that performs communication processing, and the measurement unit 40. A monitoring unit 42 that performs various calculations, and a storage unit 44.

  The measuring unit 40 is connected to the distribution line 2 and measures its own voltage V and active power P for each first period. The first period can be set to 0.1 seconds as an example. The monitoring unit 42 monitors the voltage V and the active power P measured by the measuring unit 40, acquires the voltage V every second period, and sends it to the arithmetic processing unit 43. The second period may be any value as long as it is an integral multiple of the first period, but can be 1 second as an example.

  An appropriate voltage upper and lower limit value 441 is stored in the storage unit 44 in advance. The appropriate voltage upper / lower limit value 441 includes an appropriate voltage upper limit value and an appropriate voltage lower limit value, and defines an appropriate voltage range to be maintained for the section of the distribution line 2 including the voltage measurement point of the cooperative voltage measuring device 8. The appropriate voltage upper / lower limit value 441 can be set to be variable in terms of time.

  The arithmetic processing unit 43 executes various arithmetic processes. Specifically, the fluctuation calculation unit 431 of the arithmetic processing unit 43 stores the voltage measurement value output from the voltage monitoring unit 42 in the storage unit 44 for a first certain period. Further, the fluctuation calculation unit 431 of the arithmetic processing unit 43 calculates the fluctuation amount ΔP of the active power P for each second period and the fluctuation amount ΔV of the voltage V for each second period. ΔP is a fluctuation amount of the active power per unit time, that is, the second period, and ΔV is a fluctuation amount of the voltage per unit time, that is, the second period. Specifically, Δp = p (i) −p (i−1) where the measurement value of the i-th active power input from the monitoring unit 42 every second period is p (i). ). Further, when the measured value of the i-th input voltage input every second period from the monitoring unit 42 is v (i), it is calculated as ΔV = v (i) −v (i−1). .

  The fluctuation calculation unit 431 of the arithmetic processing unit 43 stores ΔP and ΔV in the storage unit 44 for a second fixed period. As an example, the second fixed period can be set to 10 minutes when corresponding to a voltage control device connected to a solar cell, and one day when corresponding to a voltage control device to which regenerative power is input. Furthermore, the fluctuation calculation unit 431 of the arithmetic processing unit 43 predicts the fluctuation range of the active power when the voltage suddenly changes. Specifically, the fluctuation calculating unit 431 includes the maximum value ΔPmax of the positive fluctuation amount and the maximum of the negative fluctuation amount among ΔPs of the latest third fixed period of ΔP stored in the storage unit 44. The value ΔPmax ′ is obtained, and ΔPmax and ΔPmax ′ are stored in the storage unit 44 as the active power fluctuation width 442. The active power fluctuation range 442 is a predicted value of the fluctuation range of the active power at the time of sudden voltage change. ΔPmax is the absolute value of the maximum fluctuation amount on the positive side when P changes, that is, the absolute value of the maximum fluctuation amount on the positive side, and ΔPmax ′ is the absolute value of the maximum fluctuation amount on the negative side when P changes. It is. The third fixed period is a period that is equal to or shorter than the second fixed period, and can be set according to the voltage fluctuation state at the location where the cooperative voltage measuring device 8 is installed. In places where the main cause of sudden voltage change is regenerative power, the third constant period is the first period Tm1, and in places where the main cause of sudden voltage change is due to solar power generation, the third constant period. Is set to a second period Tm2 shorter than the first period. As an example, the first period can be set to half a day, and the second period can be set to 10 minutes.

  FIG. 3 is a diagram illustrating an example of a temporal change in the effective power P output from the PCS 105 that converts regenerative power into AC power. FIG. 4 is a diagram illustrating an example of a temporal change in the effective power P output from the PCS 11 connected to the solar cell. As shown in FIG. 3, the active power P output from the PCS 105 that converts regenerative power into AC power is often zero, but increases rapidly when the train decelerates. For this reason, ΔPmax occurs when the train decelerates. The active power P output from the PCS 11 connected to the solar cell varies widely. In addition, the amount of power generated by solar cells varies greatly within a day. For this reason, if the second period Tm2 is set to one day, there is a possibility that long-term fluctuations may be included. Therefore, the second period Tm2 is set shorter than the first period Tm1.

In addition, the conversion coefficient calculation unit 432 of the arithmetic processing unit 43 converts the active power fluctuation amount into the voltage fluctuation amount based on ΔP and ΔV of the second fixed period stored in the storage unit 44. A conversion coefficient 443 is calculated and stored in the storage unit 44. Specifically, the conversion coefficient calculation unit 432 of the arithmetic processing unit 43 calculates the conversion coefficient as follows. Let ΔP (i) and Δv (i) be ΔP and ΔV calculated when the measured value of the i-th voltage and active power is input from the monitoring unit 42. When Δp (i) is larger than the threshold value a, the conversion coefficient calculation unit 432 calculates the conversion coefficient G for converting the fluctuation amount of the active power into the fluctuation amount of the voltage by the following equation (1).
When Δp (i)> a,
G (i) = b × Δv (i) / Δp (i) + (1−b) G (i−1)
When Δp (i) ≦ a,
G (i) = G (i-1)
... (1)
a is a value larger than 0, and is a threshold for considering only Δv (i) / Δp (i) when P changes significantly when calculating the conversion coefficient G. b is a constant less than 1.

  The above equation (1) is equivalent to calculating the coefficient G using a first-order lag filter, but instead of calculating the conversion coefficient G using a first-order lag filter, Δv (i) where Δp (i)> a is satisfied. ) / Δp (i) may be calculated as the conversion coefficient G by a moving average, a section average, or the like for a second fixed period.

  Note that in order to eliminate short-cycle fluctuations in voltage and active power, the measured value itself and the voltage and active power acquired by the monitoring unit 42 are not used as v (i) and p (i) above. Alternatively, a value smoothed by a first-order lag filter with a time constant shortened from the above equation (1), a moving average value of voltage and active power acquired by the monitoring unit 42, a section average value, or the like may be used. As an example, when the second period, which is the period in which the monitoring unit 42 acquires the voltage and active power, is 1 second, the moving average value of the voltage and active power for 10 seconds is calculated for each second period. Then, the moving average value of the voltage calculated every second period is used as the above v (i), and the moving average value of the active power calculated every second period is used as the above p (i). Similarly, when obtaining ΔPmax, Δp calculated using a value smoothed by a first-order lag filter, a moving average value of active power, a section average value, or the like may be used as p (i).

  Further, in the above (1), instead of Δp (i) and Δv (i), each of Δp (i) and Δv (i) is converted by a first-order lag filter having a time constant shorter than that of the above equation (1). A smoothed value may be used. Further, instead of Δp (i) and Δv (i), Δp (i) and Δv (i) moving average values, interval average values, etc. in a short period may be used.

  Further, each time the arithmetic processing unit 43 acquires the latest measured voltage value from the monitoring unit 42, the arithmetic processing unit 43 uses the past measured voltage value and the latest measured voltage value already stored in the storage unit 44 to calculate the voltage. A voltage average value 444 that is an average value of the measured values over a first fixed period is calculated and stored in the storage unit 44. The voltage average value 444 is held in the storage unit 44 for a predetermined period. That is, the history of the voltage average value is held in the storage unit 44. The second certain period is set shorter than the first certain period. As an example, the first fixed period can be set from several seconds to several minutes.

The arithmetic processing unit 43 has a function of issuing target voltage change request information in addition to the arithmetic processing function. In other words, the arithmetic processing unit 43 includes a target voltage change request information generation unit 433, which adds or subtracts a value obtained by converting a predicted value of the fluctuation range of active power into a voltage to the latest voltage average value 444. When the calculated value deviates from the range defined by the appropriate voltage upper / lower limit value 441, that is, within the appropriate range, target voltage change request information is generated. Specifically, when the value obtained by adding ΔVmax to the latest voltage average value 444 exceeds the appropriate voltage upper limit value, or when the value obtained by subtracting ΔVmax ′ from the latest voltage average value 444 is less than the appropriate voltage lower limit value, Judged to have deviated from the appropriate range. ΔVmax is a predicted value of the maximum fluctuation amount on the positive side of the voltage, and ΔVmax ′ is a predicted value of the maximum fluctuation amount on the negative side of the voltage. The target voltage change request information generation unit 443 calculates ΔVmax and ΔVmax ′ by the following equations (2) and (3).
ΔVmax = ΔPmax × G (2)
ΔVmax ′ = ΔPmax ′ × G (3)

  The arithmetic processing unit 43 transmits the target voltage change request information to the predetermined cooperative voltage control device, for example, the cooperative voltage control device 12 via the communication processing unit 41. The target voltage change request information includes a voltage change amount and a change direction. Considering communication between devices of different voltage classes, the amount of voltage change is appropriately expressed as a percentage normalized by the reference voltage, and is set to, for example, “deviation amount% + 0.5%”. That is, in this case, the voltage change amount is set as a value corresponding to the ratio of the deviation amount to the latest voltage moving average value. The reason why the voltage moving average value is used for the determination of deviation from the upper and lower voltages is to avoid issuing unnecessary target voltage change request information due to a saddle-like voltage change in seconds. Each cooperative voltage control device has a target voltage upper and lower limit value, and voltage control is performed so that the voltage is maintained within the range of the target voltage upper and lower limit values. When the change request information is received, the target voltage upper and lower limit values are changed and reset according to the contents of the request.

  The communication processing unit 41 is connected to the network cable 31 and executes communication processing. The above configuration is the same for the cooperative voltage measurement devices (CVS) 10, 17, and 21. Moreover, if the distribution line 2 is changed into the distribution line 32 in FIG. 2, it will become the same structure also about the cooperative voltage measuring device 9. FIG.

  Next, the configuration of the cooperative voltage control device will be described. The cooperative voltage control device collects, calculates, and monitors measured values of voltage and active power from the voltage control device, and performs a target voltage value command to the voltage control device. The cooperative voltage controller has a function of performing target voltage change request information. Here, the collection is to acquire the voltage value and active power of the self-end measured by the voltage control device at regular intervals from the voltage control device, and the calculation is based on the collected voltage value and active power. The calculation is to calculate a voltage average value, ΔPmax, ΔPmax ′, conversion coefficient G, and the like. Monitoring is to monitor voltage fluctuations. The target voltage value command is a command that is output to the voltage control device so that the voltage at its own end falls within the target voltage upper and lower limit values. In addition, the target voltage change request information is issued when the value obtained by adding or subtracting the predicted fluctuation amount to the latest voltage average value deviates from the appropriate voltage upper and lower limit values, as in the case of the cooperative voltage measurement device. The

  FIG. 5 is a diagram illustrating an example of the configuration of the cooperative voltage controller 12. As shown in FIG. 3, the cooperative voltage control device 12 includes a monitoring unit 60 that acquires voltage and active power from a voltage control device, a communication processing unit 61 that performs communication processing, an arithmetic processing unit 62 that performs various calculations, A reactive power output command unit 63 that generates and outputs a reactive power output command and a storage unit 64 are provided.

  The monitoring unit 60 acquires the voltage V measured by the PCS 11, which is a voltage control device to be controlled, for each first period, and sends it to the arithmetic processing unit 62. The first cycle is assumed to be the same as the first cycle that is the measurement cycle of the measurement unit 40 of the cooperative voltage measurement device 8. Note that the first cycle in which the monitoring unit 60 acquires the voltage V may be different from the first cycle that is the measurement cycle of the measurement unit 40 of the cooperative voltage measurement device 8. In addition, the monitoring unit 60 acquires the voltage V and the active power P measured by the PCS 11 every second period, and sends them to the arithmetic processing unit 62. The second cycle, which is the cycle in which the monitoring unit 60 acquires the active power P, is the same as the second cycle, in which the monitoring unit 42 of the cooperative voltage measurement device 8 acquires the voltage and active power. . Even if the second period in which the monitoring unit 60 acquires the active power P is different from the second period in which the monitoring unit 42 of the cooperative voltage measuring device 8 acquires the voltage and the active power. Good.

  The storage unit 64 stores an appropriate voltage upper and lower limit value 641 in advance. The appropriate voltage upper / lower limit value 641 includes an appropriate voltage upper limit value and an appropriate voltage lower limit value, and defines an appropriate voltage range for the section of the distribution line 2 including the voltage measurement point voltage measurement point of the PCS 11. The appropriate voltage upper / lower limit value 641 can be set to be variable in terms of time. The storage unit 64 stores a target voltage upper and lower limit value 644 in advance. The target voltage upper and lower limit values 644 are a target voltage upper limit value and a target voltage lower limit value that define a control target voltage range of the cooperative voltage control device 12.

  The fluctuation calculation unit 621 and the conversion coefficient calculation unit 622 in the calculation processing unit 62 perform the same calculations as the fluctuation calculation unit 431 and the conversion coefficient calculation unit 432 of the cooperative voltage measurement device 8. The active power fluctuation range 642 and the conversion coefficient 643 of the storage unit 64 are the same as the active power fluctuation range 442 and the conversion coefficient 443 of the cooperative voltage measurement device 8, and are calculated by the calculation of the arithmetic processing unit 62 and stored in the storage unit 64. Stored. The target voltage change request information generation unit 623 of the arithmetic processing unit 62 transmits the target voltage change request information to the predetermined cooperative voltage control device via the communication processing unit 61.

  The target voltage change processing unit 624 of the arithmetic processing unit 62 performs the same processing as the target voltage change request information generation unit 433. Note that the target voltage change processing unit 624 predicts the amount of change in voltage when the PCS 11 controls to the limit of the control capability, and takes into account the amount of change in this voltage, and then deviates from within the appropriate range. Change request information may be generated. In this case, the PCS 11 also measures the reactive power Q, and the monitoring unit 60 also acquires the reactive power Q from the PCS 11. Then, the target voltage change processing unit 624 of the arithmetic processing unit 62 obtains a conversion coefficient ΔV / ΔQ related to reactive power and voltage in the same manner as ΔV / ΔP. The target voltage change processing unit 624 calculates the maximum reactive power Q that can be output based on the rating information of the PCS 11 and the currently output active power and reactive power, and outputs the maximum reactive power Q. A voltage change amount ΔVc is obtained. The target voltage change processing unit 624, when the value obtained by subtracting the voltage change amount ΔVc from the value obtained by adding ΔVmax to the latest voltage average value exceeds the appropriate voltage upper limit value, or the value obtained by subtracting ΔVmax ′ from the latest voltage average value When the value obtained by adding the voltage change amount ΔVc is less than the appropriate voltage lower limit value, it is determined that the value has deviated from the appropriate range.

  Similarly to the arithmetic processing unit 43 of the cooperative voltage measuring device 8, the arithmetic processing unit 62 measures the voltage using the past voltage measurement value and the latest voltage measurement value already stored in the storage unit 64. A voltage average value 645 that is an average value of the values for the first fixed period is calculated and stored in the storage unit 64. The calculated voltage average value 645 is held in the storage unit 64 for a predetermined period.

  When the target voltage change processing unit 624 of the arithmetic processing unit 62 receives the target voltage change request information from another cooperative voltage control device or the cooperative voltage measurement device, the voltage change amount included in the target voltage change request information Based on the change direction, the target voltage upper / lower limit value 644 of the storage unit 64 is updated and reset.

  The departure determination unit 625 compares the voltage input in the first period with the target voltage value upper / lower limit value 644 to determine whether there is a departure from the range defined by the target voltage value upper / lower limit value 644. . Specifically, it is determined that there is a deviation when the voltage exceeds the target voltage upper limit value or the voltage falls below the target voltage lower limit value. The deviation determination unit 625 obtains an integral value of the deviation amount by adding the deviation amount when the deviation continues, and resets the integral value of the deviation amount when there is no deviation, so that the integral value of the deviation amount is preset. When a predetermined threshold is exceeded, a voltage command is generated by PID (Proportional Integral Derivative) control so as to keep the voltage within the target voltage upper and lower limit values, and is output to the reactive power output command unit 63. The reactive power output command unit 63 outputs the input voltage command to the PCS 11 as a reactive power output command. The PCS 11 controls the voltage by outputting the reactive power Q in response to the reactive power output command. Further, the reactive power type cooperative voltage controller 12 includes a reactive power attenuation mechanism (not shown) that gradually reduces the commanded reactive power amount with a time constant of about 1 second so as to avoid unnecessary reactive power loss. May be.

  Further, the initial value of the target voltage upper and lower limit values of the reactive power type cooperative voltage control device 12, that is, the value in the state without the target voltage change request information, is obtained by adding or subtracting a certain dead band to the average value of the voltage measurement value at its own end Value. As an example, the dead zone can be 0.5% of the voltage average value.

  The above configuration is common to the reactive power type cooperative voltage control apparatus. That is, the cooperative voltage control devices 19, 23, and 106 have the same configuration as the cooperative voltage control device 12 of FIG. However, since the cooperative voltage control device 106 controls the PCS 105 that supplies regenerative power to the distribution line 2, it receives target voltage change request information from another device and changes the target voltage upper and lower limit values. It does not have to have a function.

  In the case of the cooperative voltage control device 106 that controls the PCS 105 that supplies regenerative power to the distribution line 2, there is a high possibility that the active power is output to the limit that can be output by the rating of the PCS 105. In such a case, instead of obtaining ΔPmax in the above procedure, ΔPmax may be set in advance based on the rating of the PCS 105.

  Further, the cooperative voltage control device 7 that controls the SVR 6 that is a transformer-type voltage control device replaces the reactive power output command unit 63 of the cooperative voltage control device 12 with a tap position change command unit, Instead, a departure determination unit according to the control of the tap position is provided, but other than these are the same as the cooperative voltage control device 8. When the deviation from the upper and lower limit values of the target voltage value of the voltage continues, the deviation determination unit of the cooperative voltage control device 7 obtains an integral value of the deviation amount by adding the deviation amount, and when there is no deviation Resets the integral value of the deviation amount, and generates a voltage command so that the voltage falls within the target voltage upper and lower limit values when the integral value of the deviation amount exceeds a predetermined threshold value to the tap position change command section. input. The tap position change command unit outputs the input voltage command to the SVR 6 as a tap position change command. The SVR 6 controls the voltage by adjusting the tap position T according to the tap position change command. Note that, in order to reduce the number of tap operations, the threshold value related to the integral value of the deviation amount is set to be larger than that of the cooperative voltage control device that controls the reactive power type voltage control device. Note that the target voltage change request information generation unit 623 is not provided for the cooperative voltage control device 7 that controls the SVR 6 that is a transformer-type voltage control device, or the target voltage change request information generation unit according to the configuration of the distribution system The function 623 may be invalidated. Alternatively, the generated target voltage change request information may not be transmitted.

  The initial value of the target voltage upper and lower limit values of the cooperative voltage control device 7 that controls the transformer-type voltage control device, that is, the value in the state without the target voltage change request information, is a predetermined constant value, or a day of the week, A value obtained by adding or subtracting a certain dead zone to a certain value determined according to the time zone or the like may be used. Thereby, the voltage is maintained in the normal state where there is no target voltage change request information on the distribution system load side. This dead zone can be 1% as an example.

  Next, the operation of issuing the target voltage change request information in the cooperative voltage measurement device or the cooperative voltage control device will be described. First, prediction of the fluctuation range at the time of sudden voltage change will be described. FIG. 6 is a flowchart illustrating an example of a processing procedure for predicting a fluctuation range at the time of sudden voltage change. As described above, the voltage control device connected to the cooperative voltage measuring device or the cooperative voltage control device measures its own voltage and active power every first cycle that is a fixed cycle (step S1). The cooperative voltage measurement device or the cooperative voltage control device obtains ΔV and ΔP based on the measurement results of the voltage and the active power every second period, and updates the conversion coefficient G (step S2). In addition, the cooperative voltage measurement device or the cooperative voltage control device updates the maximum fluctuation range, that is, the active power fluctuation range within a certain period, that is, the third certain period (step S3). The above processing is performed every second period, and the conversion coefficient and the active power fluctuation range in the storage unit 44 or the storage unit 64 are updated.

  Next, processing for issuing target voltage change request information will be described. FIG. 7 is a flowchart illustrating an example of a processing procedure for issuing target voltage change request information. The cooperative voltage measurement device or the cooperative voltage control device calculates ΔVmax and ΔVmax ′ using the active power fluctuation range and the conversion coefficient stored in the storage unit 44 or the storage unit 64, and the storage unit 44 or the storage unit 64. It is determined whether or not the voltage average value + ΔVmax and the voltage average value −ΔVmax stored in are within the range of the upper and lower limits of the appropriate voltage (step S11). When the voltage average value + ΔVmax or the voltage average value −ΔVmax deviates from the range of the appropriate voltage upper and lower limit values (No in step S11), target voltage change request information is issued (step S12). Specifically, target voltage change request information is generated and transmitted to a predetermined cooperative voltage control apparatus. When the voltage average value + ΔVmax and the voltage average value −ΔVmax are within the range of the appropriate voltage upper and lower limit values (step S12 Yes), step S11 is repeated.

  Note that, as described above, in the cooperative voltage control apparatus that controls the reactive power type voltage control device, the voltage average stored in the storage unit 44 or the storage unit 64 is considered in step S11 in consideration of the controllable amount. It may be determined whether the value + ΔVmax−ΔVc or the voltage average value −ΔVmax + ΔVc is within the range of the appropriate voltage upper and lower limit values.

  FIG. 8 is a diagram showing a concept of voltage change when the voltage average value + ΔVmax exceeds the appropriate voltage upper limit value. In the example of FIG. 8, the cooperative voltage measurement device or the cooperative voltage control device determines that the voltage average value + ΔVmax has exceeded the appropriate voltage upper limit value at time t1, and issues target voltage change request information at time t2. Is shown. A voltage 201 indicates a change in voltage when the target voltage change request information is not issued, and a voltage 202 indicates a voltage when the target voltage change request information is issued. The voltage 202 when the target voltage change request information is issued is lower than the voltage 201 because control for lowering the voltage is performed. After the target voltage change request information is issued, when a voltage fluctuation that actually becomes ΔVmax occurs, the voltage 201 exceeds the appropriate voltage upper limit value, but the voltage 202 when the target voltage change request information is issued is The upper limit of the appropriate voltage is not exceeded.

  Next, the target voltage change operation of the cooperative voltage control apparatus that has received the target voltage change request information will be described. The following processing may be performed not only by the cooperative voltage control apparatus that has received the request, but also by the cooperative voltage control apparatus itself that has issued the request. In the configuration example of FIG. 1, the cooperative voltage control apparatus that controls the PCS 105 for regeneration uses the regenerative power to the maximum extent. It is not necessary to change the lower limit value. On the other hand, the cooperative voltage control device 12 that controls the PCS 11 connected to the solar cell also performs the following processing when issuing a request by itself. Upon receiving the request, the cooperative voltage control apparatus changes the target voltage upper and lower limit values based on the request, and fixes the target voltage upper and lower limit values during the voltage cooperative control effective time predetermined for each cooperative voltage control apparatus. . The voltage cooperative control effective time can be set to 1 hour as an example.

  FIG. 9 is a flowchart showing target voltage change processing by the cooperative voltage control apparatus that has received the target voltage change request information. First, the cooperative voltage control apparatus receives target voltage change request information from the cooperative voltage measurement apparatus or another cooperative voltage control apparatus (step S21).

  Next, the cooperative voltage controller determines whether the content of the target voltage change request information is a request to lower or increase the voltage (step S22). When the request to lower the voltage is received (step S22 Yes), the cooperative voltage control device includes the latest voltage average value and the maximum voltage average among the plurality of voltage average values stored in the storage unit at that time. A value is selected, and a value obtained by subtracting the voltage change amount from the maximum voltage average value is set as a new target voltage upper limit value (step S23). At this time, in order to keep the target voltage upper and lower limit width constant, the target voltage lower limit value is set to a value obtained by subtracting twice the dead zone from the target voltage upper limit value (step S23). However, when the target voltage lower limit value thus determined is lower than the appropriate voltage lower limit value of the cooperative voltage control device (No in step S24), the cooperative voltage control device does not change the target voltage upper and lower limit values. The request is discarded, and the relay of the request is not performed (step S28). When the target voltage lower limit value is equal to or higher than the appropriate voltage lower limit value (step S24 Yes), the cooperative voltage control device sets the target voltage upper and lower limit values determined in step S23 (step S25).

  When a request to increase the voltage is received (No in step S22), the cooperative voltage control apparatus includes the latest voltage average value and the minimum voltage average value stored in the storage unit at that time. A voltage average value is selected, and a value obtained by adding the voltage change amount to the minimum voltage average value is set as a new target voltage lower limit value (step S26). At this time, in order to keep the target voltage upper and lower limit values constant, the target voltage upper limit value is set to a value obtained by adding twice the dead zone to the target voltage lower limit value (step S26). However, when the target voltage upper limit value thus determined exceeds the appropriate voltage upper limit value of the cooperative voltage control device (No in step S27), the cooperative voltage control device does not change the target voltage upper and lower limit values. The request is discarded, and the relay of the request is not performed (step S28). When the target voltage upper limit value is less than or equal to the appropriate voltage upper limit value (S27 Yes), the cooperative voltage control device sets the target voltage upper and lower limit values determined in step S26 (step S25).

  The cooperative voltage control device returns the target voltage upper and lower limit values to the initial values after the voltage cooperative control effective time has elapsed since the request was received.

  When new target voltage change request information is generated even during the voltage cooperative control effective time, the cooperative voltage control device changes the target voltage value by giving priority to the request received later, and changes the target voltage value. The voltage cooperative control effective time is counted from the time. However, in order to avoid congestion of the voltage cooperative operation, the overlap operation prohibition time is determined for each of the cooperative voltage measurement device and the cooperative voltage control device. That is, the cooperative voltage measurement device does not issue or send a new request before the duplicate transmission prohibition time has elapsed since the request was issued. For example, the duplicate transmission prohibition time can be set to 10 seconds. The cooperative voltage controller that controls the reactive power voltage controller does not issue a new request before the overlap operation prohibition time has elapsed since the request transmission. In addition, the cooperative voltage controller that controls the reactive power type voltage controller does not change the target voltage even if a request is received before the overlap operation prohibition time elapses after the request is received. The overlap operation prohibition time of the reactive power type cooperative voltage control apparatus can be set to 1 minute as an example. Similarly, the cooperative voltage controller that controls the transformer-type voltage controller does not issue a new request before the overlap operation prohibition time has elapsed since the request was issued. In addition, the cooperative voltage controller that controls the transformer-type voltage controller does not change the target voltage even if a request is received before the overlap operation prohibition time elapses after the request is received. The duplication operation prohibition time of the transformer type cooperative voltage control device can be set to 30 minutes as an example. The overlapping operation prohibition time is shorter than the voltage cooperative control effective time.

  Next, the request relay system will be described. FIG. 10 is a diagram illustrating an example of a communication path between the cooperative voltage measurement device and the cooperative voltage control device, that is, a logical network. In FIG. 10, an arrow indicates a direction in which target voltage change request information can be transmitted. The relay range of the target voltage change request information is set so as to remain within the same distribution line. As can be seen from the comparison between FIG. 10 and FIG. 1, this logical network includes the cooperative voltage measurement device group, the cooperative voltage control device group, the connection control device 16, and the distribution line group in the distribution system shown in FIG. 1. It has a network configuration corresponding to the electrical connection configuration. That is, the arrangement configuration of the cooperative voltage measurement device group, the cooperative voltage control device group, and the connection control device 16 corresponds to these connection relationships in the power distribution system.

  The cooperative voltage measurement device does not receive the target voltage change request information from another, and when the target voltage change request information is issued by itself, the generated target voltage change request information is set to one or more predetermined target voltage change request information. To the voltage controller. When receiving the target voltage change request information from another, the cooperative voltage control device can transmit the received target voltage change request information to one or more other predetermined cooperative voltage control devices. However, the cooperative voltage control apparatus does not transmit the target voltage change request information to the transmission source. In addition, when the cooperative voltage control device generates the target voltage change request information by itself, the cooperative voltage control device transmits the target voltage change request information to one or more other predetermined cooperative voltage control devices.

  FIG. 11 is a diagram illustrating an example of communication between cooperative voltage control devices. FIG. 11 shows a case where the cooperative voltage control apparatus 106 issues target voltage change request information. The cooperative voltage controller 106 generates target voltage change request information and transmits it to the cooperative voltage controller 12. The cooperative voltage control device 12 transmits the received target voltage change request information to the cooperative voltage control device 7. When the voltage change amount based on the target voltage change request information received from the cooperative voltage control device 106 is achievable by the cooperative voltage control device 12, the cooperative voltage control device 12 displays the target voltage change request information as cooperative voltage control. Do not send to device 7.

  Note that each of the cooperative voltage measurement device, the cooperative voltage control device, and the connection control device 16 holds a network address of a transmission destination of the target voltage change request information. The network address is set such that the relay range of the target voltage change request information remains within the same distribution line. For example, the cooperative voltage measurement device 21 holds the network address of the cooperative voltage control device 23 as a transmission destination, and the cooperative voltage control device 19 uses the cooperative voltage control device 23 and the connection control device as transmission destinations. It holds 16 network addresses. When the cooperative voltage control device 19 issues the target voltage change request information itself or receives the target voltage change request information from the cooperative voltage measurement device 17, the cooperative voltage control device 23 and the connection control device 16. When the target voltage change request information is sent out with the network address of the destination as the transmission destination and the target voltage change request information is received from the cooperative voltage control device 23 or the connection control device 16, the other network address other than the transmission source is sent to the destination. To send target voltage change request information.

  As shown in FIG. 10, the logical network is configured based on electrical connection, that is, one distribution line whose voltage is directly linked to each other, but the electrical network is changed by changing the switching state of the switch or circuit breaker. If there is a possibility that the general connection is changed, the connection control device 16 is installed in order to reflect the electrical connection change in the relay range of the target voltage change request information. When the switch or circuit breaker is turned on, the connection control device 16 relays the target voltage change request information, and when the switch or circuit breaker is open, the connection control device 16 changes the target voltage. Discard the request information.

  As described above, in the present embodiment, the cooperative voltage measurement device and the cooperative voltage control device have the voltage corresponding to the measured voltage and the predicted value of the fluctuation range of the active power, that is, the predicted value of the fluctuation range of the voltage, Based on the above, it is determined whether to issue the target voltage change request information. For this reason, the occurrence of deviation from the appropriate range of the voltage of the distribution system is suppressed when the voltage of the distribution system suddenly changes.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 Distribution transformer, 2, 32 to 34 Distribution line, 3,101 Circuit breaker, 4,14 Transformer, 5 Load, 15 Switch, 29 Busbar, 30 Communication network, 31 Network cable, 7, 12, 19, 23 CVC, 8, 9, 10, 17, 21 CVS, 11, 18, 105 PCS, 16 CC, 40 Measuring unit, 41, 61 Communication processing unit, 42, 60 Monitoring unit, 43, 62 Arithmetic processing unit, 44, 64 storage unit, 63 reactive power output command unit, 431, 621 fluctuation calculation unit, 432, 622 conversion coefficient calculation unit, 433, 623 target voltage change request information generation unit, 624 target voltage change processing unit, 625 deviation determination unit.

Claims (8)

In a distribution system voltage control system comprising a plurality of voltage control devices connected to a distribution line of a high voltage system and controlling the voltage of the distribution line, so that the voltage is maintained within the range of the target voltage upper limit value and the target voltage lower limit value A voltage control device for controlling the voltage control device,
Using the voltage and active power measured by the voltage control device, a first predicted value which is a predicted value of the maximum fluctuation amount on the positive side of the voltage per unit time and a maximum on the negative side of the voltage per unit time A fluctuation calculating unit that calculates a second predicted value that is a predicted value of the fluctuation amount of
A value obtained by adding the first predicted value to the voltage measured by the voltage control device exceeds an appropriate voltage upper limit value, or a value obtained by subtracting the second predicted value from the voltage measured by the voltage control device. A target voltage change request information generating unit for generating target voltage change request information for requesting a change of the target voltage upper limit value and the target voltage lower limit value of another voltage control device,
A communication processing unit for transmitting the target voltage change request information to a voltage control device other than its own device;
Using the voltage and active power measured by the voltage control device, a conversion coefficient calculation unit that calculates a conversion coefficient for converting a fluctuation amount of the active power per unit time into a fluctuation amount of the voltage per unit time;
Equipped with a,
The fluctuation calculation unit uses the active power per unit time measured by the voltage control device, and the absolute value of the amount of change when the measured active power is increased from the previously measured active power for a certain period The first maximum value that is the maximum value of the first and the second maximum value that is the maximum value within the certain period of the absolute value of the amount of change when the measured active power is decreased from the previously measured active power And a value obtained by multiplying the first maximum value by the conversion coefficient is calculated as the first prediction value, and a value obtained by multiplying the second maximum value by the conversion coefficient is the second prediction. A voltage control device that calculates a value . The communication processing unit receives the target voltage change request information from outside the device,
When the communication processing unit receives the target voltage change request information from outside the own device or when the target voltage change request information generation unit of the own device generates the target voltage change request information, the target voltage change request information A target voltage change processing unit for changing the target voltage upper limit value and the target voltage lower limit value of the own device according to the content,
The voltage control apparatus according to claim 1, further comprising: The fluctuation calculating unit is configured to calculate the first maximum value based on a value obtained by smoothing active power measured by the voltage control device using a first-order lag filter, or a moving average value or a section average value of a period shorter than the certain period. voltage controller according to claim 1 or 2, characterized in that calculating the second maximum value. When the voltage control device converts the regenerative power generated when the train decelerates into AC power and controls the voltage control device supplied to the distribution line, the fixed period is the first period,
4. When controlling a power conditioner that is a voltage control device connected to a solar cell, the certain period is set to a second period shorter than the first period . 5. voltage controller according to One. The conversion coefficient is obtained by calculating the amount of fluctuation per unit time of the voltage measured by the voltage control device when the amount of fluctuation per unit time of the active power measured by the voltage control device is larger than the threshold. The value obtained by dividing the value obtained by dividing the active power measured by the unit time by the first-order lag filter, or the amount of fluctuation per unit time of the voltage measured by the voltage control device by the voltage control device. 5. The voltage control device according to claim 1 , wherein the voltage control device is a moving average value or a section average value of a value obtained by dividing the measured active power by a fluctuation amount per unit time. . The fluctuation calculation unit is a voltage fluctuation per unit time based on a value obtained by smoothing a voltage measured by the voltage control device using a first-order lag filter, or a moving average value or a section average value of a period shorter than the certain period. The amount of active power measured by the voltage control device is smoothed by a first-order lag filter, or the active power fluctuation per unit time based on a moving average value or a section average value of a period shorter than the certain period The voltage control device according to claim 5 , wherein an amount is obtained. When the target voltage change request information generation unit controls a reactive power adjustment type voltage control device, the target voltage change request information generation unit is configured to output the maximum invalidity that the voltage control device can output based on the reactive power and the active power measured by the voltage control device. The first control amount, which is a predicted value of the voltage that can be lowered by the own device using the maximum reactive power that can be output, and the predicted value of the voltage that can be raised by the own device. A value obtained by subtracting the first control amount from a value obtained by adding the first predicted value to the voltage measured by the voltage control device exceeds an appropriate voltage upper limit value, or Target voltage change request information is generated when a value obtained by adding the second control amount to a value obtained by subtracting the second predicted value from a voltage measured by a voltage control device is lower than an appropriate voltage lower limit value. Toss Voltage controller according to any one of claims 1 6. A voltage control device that is connected to a distribution line of a high-voltage system and controls the voltage of the distribution line, and a voltage control device that controls the voltage control device so that the voltage is maintained within a range of a target voltage upper limit value and a target voltage lower limit value In a distribution system voltage control system comprising: a voltage measuring device connected to the distribution line,
A measuring unit that measures the voltage and active power of the distribution line at a position different from the position of the distribution line to which the voltage control device is connected;
Using the voltage and active power measured by the measurement unit, the first predicted value, which is a predicted value of the maximum fluctuation amount on the positive side of the voltage per unit time, and the maximum on the negative side of the voltage per unit time. A fluctuation calculating unit that calculates a second predicted value that is a predicted value of the fluctuation amount;
A value obtained by adding the first predicted value to the voltage measured by the measuring unit exceeds an appropriate voltage upper limit value, or a value obtained by subtracting the second predicted value from the voltage measured by the measuring unit is appropriate. A target voltage change request information generating unit for generating target voltage change request information for requesting a change of the target voltage upper limit value and the target voltage lower limit value of the voltage control device when the voltage lower limit value is exceeded;
A communication processing unit for transmitting the target voltage change request information to the voltage control device;
Using the voltage and active power measured by the voltage control device, a conversion coefficient calculation unit that calculates a conversion coefficient for converting a fluctuation amount of the active power per unit time into a fluctuation amount of the voltage per unit time;
Equipped with a,
The fluctuation calculation unit uses the active power per unit time measured by the voltage control device, and the absolute value of the amount of change when the measured active power is increased from the previously measured active power for a certain period The first maximum value that is the maximum value of the first and the second maximum value that is the maximum value within the certain period of the absolute value of the amount of change when the measured active power is decreased from the previously measured active power And a value obtained by multiplying the first maximum value by the conversion coefficient is calculated as the first prediction value, and a value obtained by multiplying the second maximum value by the conversion coefficient is the second prediction. voltage measuring device according to claim that you calculated as a value.

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