JP5583094B2 - Phase advance capacitor controller and power factor adjuster - Google Patents

Description

  The present invention relates to a phase advance capacitor controller and a power factor adjuster that compensate for a reactive power load at a power receiving point of a commercial system.

  For customers who receive power from commercial systems (commercial power systems) such as high-voltage systems and extra-high systems, the more the delay of the power factor at the receiving point of the commercial system is advanced, that is, the closer the active power is to 100%, There is a power factor discount system that reduces the basic charge for using electricity. Therefore, many customers have installed a phase advance capacitor in the customer premises system in order to compensate (improve) the delay of the power factor at the power receiving point in the forward direction.

  However, the phase advance capacitor is always connected so that the power factor is around 100% at heavy load when the reactive power load (the difference between the reactive power at the power receiving point and the capacity of the phase advance capacitor) is large. In the configuration for compensating the rate, overcompensation in which the phase advance capacitor is inserted more than necessary at the time of light load where the reactive power load becomes small, and the power factor advances extremely. Therefore, in such a configuration in which compensation is performed, there is a possibility that the power loss of the customer premises system or the commercial system is increased and the system voltage is unnecessarily increased.

  Therefore, as a general measure to maintain the power factor at the power receiving point close to 100% regardless of whether the load is heavy or light, the phase advance is performed so that the phase advance capacitor is automatically turned on and off. The power factor regulator which adjusts a power factor with a capacitor control device is realized.

  For example, Patent Document 1 discloses a phase-advancing capacitor control logic generally used in a phase-advancing capacitor control device. Specifically, the phase is advanced when the reactive power load at the measured power receiving point is delayed (that is, the reactive power compensation by the phase advance capacitor is insufficient) from the preset input point. Increase the input amount of the capacitor. If there are multiple phase-advancing capacitors, select a combination of phase-advancing capacitors necessary and sufficient to compensate for the reactive power load, turn on the selected phase-advancing capacitors, and open the other phase-advancing capacitors. Implement control.

  For example, assuming a configuration having two phase-advancing capacitors, one of which is 20 kVr and the other is 50 kVar, there are four possible patterns of 0 kVar, 20 kVar, 50 kVar, and 70 kVar as possible combinations of phase-advancing capacitors. In this configuration, when the reactive power gradually increases from 0 kVar to 60 kVar, (1) all open → (2) 20 kVar input → (3) 20 kVar open and 50 kVar input → (4) 50 kVar input maintained and 20 kVar re-input It is controlled in the order of (total 70 kVar).

  On the contrary, when the reactive power load is advanced from the preset breaking point (that is, the reactive power compensation by the phase advance capacitor is excessive), the amount of input of the phase advance capacitor is reduced. In this case as well, if there are multiple phase advance capacitors, select the necessary and sufficient combination to compensate for the reactive power load, insert the selected phase advance capacitor, and open the other phase advance capacitors. Implement control.

JP-A-6-4159

  However, when the control logic as described above is performed, when the reactive power load fluctuates greatly, the turning-on / off control of the phase-advancing capacitor occurs frequently like the 20 kVar phase-advancing capacitor described above. , Leading to a decrease in the life of the switch. As a measure to avoid this, set the operation time limit for a predetermined time, and do not implement the on / off switching control unless it is delayed from the on-point or advanced from the shut-off point for more than the operation time limit. Can be considered. However, this measure has a problem that the power factor during that period cannot be compensated because the state that is delayed from the input point continues at least during the operation time period.

  In addition, once the phase advance capacitor is opened, there is a restriction that it cannot be turned on again for several minutes until the charging power inside the capacitor is completely discharged. Therefore, when shifting from (3) to (4) in the above example, it cannot be re-inserted for several minutes after the 20 kVar phase-advancing capacitor is opened until it is fully discharged. Therefore, when the reactive power load increases rapidly, the advancing capacitor cannot be turned on immediately, so that the power factor cannot be compensated for that time.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a technique capable of appropriately compensating the power factor while suppressing the frequency of control of the phase advance capacitor. .

  The phase-advancing capacitor control device according to the present invention selectively turns on and opens a plurality of phase-advancing capacitors having different capacities on the load side of the power receiving point based on the reactive power measured at the power receiving point of the commercial system. A phase-advancing capacitor control device that controls the reactive power and a change record of the reactive power load that is a difference between the reactive power and the capacity of the phase-advancing capacitor that was supplied when the reactive power was obtained. A fluctuation statistical processing unit for performing statistical processing is provided. Further, the phase advance capacitor control device is configured to determine the maximum reactive power load up to the future when a predetermined time elapses from the present based on the current reactive power load and the result of the statistical processing in the fluctuation statistical processing unit. A maximum load prediction unit that predicts the maximum reactive power load, and an input determination unit that determines a combination of input and release of the plurality of phase-advancing capacitors capable of compensating the maximum reactive power load predicted by the maximum load prediction unit; And a control unit that performs control to turn on and open the plurality of phase-advancing capacitors based on the combination determined by the input determination unit.

  According to the present invention, the maximum reactive power load to be compensated is predicted in the time width of a predetermined period, and the turning on and off of the phase advance capacitor are controlled so as to compensate for it. Therefore, when the reactive power load increases rapidly, control is performed with the desired combination of input and release without going through the combination of input and release in the middle, so the frequency of controlling the phase-advancing capacitor is suppressed. Can do. Accordingly, since the frequency of opening the phase advance capacitor can be suppressed, the frequency of waiting time until the phase advance capacitor is completely discharged can be suppressed. Therefore, the power factor can be appropriately compensated.

3 is a diagram showing a configuration of a power factor adjuster according to Embodiment 1. FIG. It is a figure which shows the relationship between a reactive power load and its maximum fluctuation range. 4 is a flowchart illustrating processing of a load calculation unit and a load fluctuation calculation unit according to the first embodiment. 3 is a flowchart showing processing of a variation statistics processing unit according to the first embodiment. 4 is a flowchart illustrating processing of a maximum load prediction unit, an input determination unit, and a control unit according to the first embodiment. It is a figure which shows the relationship between the range of the reactive power load which concerns on Embodiment 1, and the combination of a several phase advance capacitor. It is a figure which shows the structure of the power factor regulator which concerns on Embodiment 2. FIG. 6 is a flowchart showing processing of a power factor adjuster according to the second embodiment. It is a figure which shows operation | movement of the power factor regulator which concerns on Embodiment 2. FIG.

<Embodiment 1>
FIG. 1 is a diagram showing a configuration of a power factor adjuster 100 according to Embodiment 1 of the present invention. As shown in this figure, the power factor adjuster 100 measures the reactive power (hereinafter also referred to as “power receiving point reactive power”) at the phase advance capacitor control device 1 and the power receiving point 2 of the commercial system. An electric power meter 3 and a plurality (two in this case) of phase advance capacitors 4 having different capacities are provided.

  The plurality of phase-advancing capacitors 4 are facilities for canceling the power receiving point reactive power and compensating (improving) the power factor at the power receiving point 2, and are extended to the load (premises load) side of the power receiving point 2 The demanded premises system 5 is selectively charged and released. In the present embodiment, the phase advance capacitor 4 is a transformer (not shown) located near the power receiving point 2 (CT / PT) or on the load side as shown in FIG. ) On the secondary side. Each of the plurality of phase advance capacitors 4 is provided with a switch 4a that opens and closes to open and close the plurality of phase advance capacitors 4 according to the control of the phase advance capacitor control device 1 (control unit 18). Yes.

  The phase advance capacitor control device 1 selectively turns on and off the plurality of phase advance capacitors 4 by controlling the opening and closing of the plurality of switches 4a based on the receiving point reactive power measured by the reactive power measuring device 3. Control to release. A phase advance capacitor control device 1 according to the present embodiment includes a phase advance capacitor DB (database) 11, a load calculation unit 12, a load fluctuation calculation unit 13, a load fluctuation DB (database) 14, and a fluctuation statistics processing unit. 15, a maximum load prediction unit 16, an input determination unit 17, and a control unit 18. Next, each component of the phase advance capacitor control device 1 will be described.

  The phase advance capacitor DB11 stores the respective capacities of the installed phase advance capacitors 4, and also stores combinations of the phase advance capacitors 4 that are currently turned on and released with respect to the plurality of phase advance capacitors 4.

  The load calculation unit 12 calculates the total capacity of the phase advance capacitor 4 that is currently turned on based on the information stored in the phase advance capacitor DB11. Then, the load calculation unit 12 obtains the reactive power load by performing subtraction by subtracting the total capacity from the power receiving point reactive power measured by the reactive power measuring device 3.

  The load fluctuation calculation unit 13 obtains a change record of the reactive power load.

  FIG. 2 is a diagram for explaining a change record obtained by the load change calculation unit 13. As shown in FIG. 2, the actual change obtained by the load fluctuation calculation unit 13 in the present embodiment is the reactive power load Q (t at a past time point (t−T1) before a predetermined period T1 that is a predetermined period from the current t. -T1) and a fluctuation range defined as a difference between the past reactive time (t-T1) and the maximum reactive power load Qpmax from the present time t. In the following description, this fluctuation range may be referred to as a “maximum fluctuation range”. The load fluctuation calculation unit 13 obtains the maximum fluctuation width for each fixed period T1. Note that the predetermined period T1 is, for example, several minutes to several tens of minutes.

  The load fluctuation DB 14 classifies the maximum fluctuation width of the reactive power load obtained by the load fluctuation calculation unit 13 by time zone and by the level of the reactive power load, and the past fixed period T2 (T2 is a period longer than T1, For example, one year) is stored. That is, the load fluctuation DB 14 stores a plurality of maximum fluctuation ranges.

  Note that the time zone here may be, for example, a 24-hour zone in which one day is divided in increments of 1 hour, a time zone in which the day is divided in units of days, a 48-hour zone, or a time zone in which units are divided into weekdays and holidays. . The reactive power load level (hereinafter referred to as “level” for short) may be, for example, 10 levels divided by 10% with the equipment capacity being 100%.

  The fluctuation statistical processing unit 15 performs statistical processing on a plurality of maximum fluctuation widths for a predetermined period T2 stored in the load fluctuation DB. In the present embodiment, the fluctuation statistical processing unit 15 performs statistical processing for obtaining the average Qavr and standard deviation Qstd of the maximum change width of the reactive power load for each time zone and for each level, and obtaining the obtained average Qavr and standard deviation Qstd, The data is stored in the load fluctuation DB 14 by time zone and level. In other words, the load fluctuation DB 14 stores not only the maximum fluctuation width but also the results of statistical processing in the fluctuation statistical processing unit 15 separately for each time zone and each level.

  Based on the current reactive power load and the result of the statistical processing obtained by the fluctuation statistical processing unit 15 stored in the load fluctuation DB 14, the maximum load prediction unit 16 performs a predetermined time from the current t (here, the above-described case). The maximum reactive power load Qfmax, which is the maximum reactive power load that can occur until the elapse of the future) is predicted. Here, the maximum load predicting unit 16 predicts the maximum reactive power load Qfmax (t + T1) from the current reactive power load Q (t), the average Qavr, and the standard deviation Qstd based on the following equation (1).

Qfmax (t + T1) = Q (t) + Qavr + α × Qstd (1)
However, in this formula (1), α is an arbitrary coefficient of 1 or more.

  The input determination unit 17 determines an optimal combination of input and release of the plurality of phase-advancing capacitors 4 that can compensate for the maximum reactive power load Qfmax (t + T1) predicted by the maximum load prediction unit 16. Here, the input determination unit 17 determines the combination based on the respective capacities of the phase advance capacitors 4 stored in the phase advance capacitor DB11. The input determination unit 17 stores the determined combination in the phase advance capacitor DB11. The combination stored here is used as the current combination after the control unit 18 performs the operation described below.

  The control unit 18 controls to selectively turn on and open the plurality of phase-advancing capacitors 4 by controlling the opening and closing of the plurality of switches 4 a based on the combination determined by the input determining unit 17. Here, the control unit 18 extracts the difference between the current combination of input and release stored in the phase advance capacitor DB11 and the combination of input and release determined by the input determination unit 17, and based on the difference Perform this control.

  Next, processing in main components in the phase advance capacitor controller 1 will be described.

  FIG. 3 is a flowchart showing processing of the load calculation unit 12 and the load fluctuation calculation unit 13 in the phase advance capacitor control device 1. Note that this processing is performed at regular intervals such as one second.

  First, in step S <b> 1, the load calculation unit 12 takes in a measured value of the power receiving point reactive power from the reactive power measuring device 3. In step S2, the load calculation unit 12 obtains the capacities of the plurality of phase advance capacitors 4 and the combinations of the current input and release from the phase advance capacitor DB11, and determines the phase of the phase advance capacitor 4 currently being supplied. Calculate the total capacity. And the load calculation part 12 calculates the difference of the receiving point reactive power acquired by step S1, and the calculated total capacity | capacitance as a reactive power load.

  In step S3, the load calculation unit 13 obtains the maximum fluctuation range (here, the maximum fluctuation range in the plus direction) for each predetermined period T1 shown in FIG. 2 from the calculated reactive power load. In step S4, the load calculation unit 13 records the maximum fluctuation range obtained in step S3 in the load fluctuation DB 14 for each time zone and each level.

  FIG. 4 is a flowchart showing the processing of the fluctuation statistics processing unit 15 in the phase advance capacitor control device 1. Note that this process is performed at regular intervals such as one month.

  First, in step S11, the fluctuation statistics processing unit 15 acquires a plurality of maximum fluctuation widths for a predetermined period T2 stored in the load fluctuation DB 14 for each time zone and each level. In step S12, the fluctuation statistics processing unit 15 obtains the average Qavr and standard deviation Qstd of the acquired maximum fluctuation range for each time zone and each level, and in step S13, these are stored in the load fluctuation DB 14 for each time zone and each level. Record.

  FIG. 5 is a flowchart showing the processing of the maximum load predicting unit 16, the input determining unit 17, and the control unit 18 in the phase advance capacitor control apparatus 1. Note that this processing is performed at regular intervals such as one second.

  First, in step S21, the maximum load predicting unit 16 acquires the current reactive power load Q (t) according to step S2 described above. In step S22, the maximum load predicting unit 16 obtains the result of statistical processing (average Qavr of maximum fluctuation range) stored in the load fluctuation DB 14 corresponding to the current time zone and the level of the current reactive power load Q (t). And standard deviation Qstd) are obtained as the results of the latest statistical process (the latest average fluctuation average Qavr and standard deviation Qstd).

  In step S23, the maximum load predicting unit 16 is based on the above equation (1) from the current reactive power load Q (t) according to step S2 and the latest average Qavr and standard deviation Qstd according to step S22. Thus, the maximum reactive power load Qfmax (t + T1) from the present t to the future (t + T1) after the elapse of a certain period T1 is predicted.

  In step S24, the input determination unit 17 determines a combination of input and release of the plurality of phase advance capacitors 4 necessary and sufficient to compensate for the predicted maximum reactive power load Qfmax (t + T1). Determine based on capacity. For example, as shown in FIG. 6, for each reactive power load range to be compensated, a combination of a plurality of phase-advancing capacitors 4 to be input is registered in a table expression in advance, and the table is referred to as described above. What is necessary is just to determine the combination of.

  In step S25, the control unit 18 obtains the current combination of turning on and releasing the plurality of phase advance capacitors 4 from the phase advance capacitor DB11. Then, in step S26, the control unit 18 compares the acquired combination of current input and release with the combination of input and release determined in step S24, and the phase-advancing capacitor 4 to be newly supplied and released. To extract. Then, the control unit 18 sends an on / off command (control command) to the switch 4 a of the phase advance capacitor 4.

  According to the phase advance capacitor controller 1 and the power factor adjuster 100 according to the present embodiment as described above, the maximum reactive power load that should be compensated for in the time width of the predetermined period T1 is predicted and compensated for. Controls the opening and closing of the phase advance capacitor 4. Therefore, when the reactive power load increases rapidly, control is performed with a desired combination of input and release without going through a combination of input and release in the middle stage, and therefore the frequency of control of the phase advance capacitor 4 is suppressed. be able to. Therefore, it is possible to suppress the life of the phase advance capacitor 4 and the like from being shortened. In addition, since the frequency with which the phase advance capacitor 4 is opened can be suppressed, the frequency with which the waiting time until the phase advance capacitor 4 is fully discharged can be suppressed. Therefore, the power factor can be quickly compensated, and the power factor can be appropriately compensated.

  Further, according to the present embodiment, the maximum load prediction unit 16 predicts the maximum reactive power load Qfmax based on the above equation (1). Therefore, the prediction accuracy can be adjusted by setting α to an arbitrary numerical value. For example, if α = 2, the probability that the actual reactive power load exceeds the predicted maximum reactive power load Qfmax can be statistically approximately 2.5%.

  Further, according to the present embodiment, the maximum load prediction unit 16 is stored in the load fluctuation DB 14 corresponding to the current reactive power load Q (t), the current time zone, and the current reactive power load level. Based on the result of the statistical processing, the maximum reactive power load Qfmax is predicted. Therefore, since the maximum reactive power load Qfmax can be predicted in consideration of the current time zone and level, the prediction accuracy of the maximum reactive power load Qfmax can be improved.

  In the above description, the case where the load calculating unit 13 obtains the maximum fluctuation range in the positive direction has been described. However, the maximum fluctuation range in the negative direction may be obtained in the same manner.

<Embodiment 2>
FIG. 7 is a diagram showing a configuration of the power factor adjuster 100 according to Embodiment 2 of the present invention. Hereinafter, in the description of the power factor adjuster 100 (phase-advancing capacitor control device 1) according to the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. .

  As shown in this figure, the power factor adjuster 100 (phase-advanced capacitor control device 1) according to the present embodiment is connected to the power factor adjuster 100 (phase-advanced capacitor control device 1) according to the first embodiment. A fluctuation initial motion detection unit 21 is added. The load fluctuation initial motion detection unit 21 acquires the reactive power load Q (t) of the current t from the load calculation unit 12.

  In addition, the load fluctuation initial motion detection unit 21 detects the past reactive power load Q (t−T1) at the first time point (t−T1) before a certain period T1 (for example, 1 minute) from the current time t and the first time point ( The past reactive power load Q (t−2 × T1) at the second time point (t−2 × T1) before the predetermined period T1 from t−T1) is acquired from the load fluctuation DB. Then, the load fluctuation initial motion detection unit 21 detects whether or not the first difference between the reactive power load Q (t) and the reactive power load Q (t−T1) is equal to or greater than a preset specified value (predetermined value). At the same time, it is detected whether or not the second difference between the reactive power load Q (t−T1) and the reactive power load Q (t−2 × T1) is equal to or greater than the above-mentioned designated value.

  FIG. 8 is a flowchart showing the processing of the load fluctuation initial motion detection unit 21, the maximum load prediction unit 16, the input determination unit 17, and the control unit 18 in the phase-advance capacitor control device 1 according to the present embodiment. Note that this processing is performed at regular intervals such as one second.

  First, in step S <b> 31, the load fluctuation initial motion detection unit 21 acquires the current power receiving point reactive power from the reactive power measuring device 3 and the current reactive power load Q (t) from the load calculation unit 12. . In step S32, the load fluctuation initial motion detection unit 21 determines whether the power receiving point reactive power is delayed, that is, whether the reactive power load is sufficiently compensated by the phase advance capacitor 4.

  If it is determined in step S32 that the compensation is sufficient, the process proceeds to step S33, and in step S33, the input determination unit 17 can compensate for the current reactive power load Q (t). Determine the combination of 4 inputs and releases. Thereafter, the process proceeds to step S40.

  If it is determined in step S32 that the compensation is insufficient, the process proceeds to step S34, and in step S34, the load fluctuation initial motion detection unit 21 detects the past reactive power loads Q (t−T1) and Q (t -2 × T1) is acquired from the load fluctuation DB 14.

  If the load fluctuation initial motion detection unit 21 detects in step S35 that the first difference between the reactive power load Q (t) and the reactive power load Q (t−T1) is smaller than the specified value, The process proceeds to step S33. That is, in this case, it is assumed that the variation of the reactive power load is small or the variation of the reactive power load is finished, and the input determination unit 17 does not predict the maximum reactive power load Qfmax and the input determining unit 17 The combination of turning on and off of the plurality of phase-advancing capacitors 4 that can compensate for the above is determined. Thereafter, the process proceeds to step S40.

  If the load fluctuation initial motion detection unit 21 detects in step S35 that the first difference is equal to or greater than the specified value, the process proceeds to step S36. In Step S36, when the load fluctuation initial motion detection unit 21 detects that the second difference between the reactive power load Q (t−T1) and the reactive power load Q (t−2 × T1) is equal to or greater than a specified value. If the previous reactive power load change continues, the control ends without performing the control.

  In step S36, when the load fluctuation initial motion detection unit 21 detects that the second difference is smaller than the specified value, it is determined that a large fluctuation in the reactive power load has started at steps S37 to S39. Then, the same processing as steps S22 to S24 described in the first embodiment is performed. That is, in step S37, the maximum load prediction unit 16 determines the average Qavr and standard deviation of the maximum fluctuation range stored in the load fluctuation DB 14 corresponding to the current time zone and the current reactive power load Q (t) level. Qstd is acquired as the average Qavr and standard deviation Qstd of the latest maximum fluctuation range.

  In step 38, the maximum load predicting unit 16 predicts the maximum reactive power load Qfmax from the current reactive power load Q (t) and the latest average Qavr and standard deviation Qstd based on the above equation (1). To do. In step S39, the input determination unit 17 determines a combination of input and release of the plurality of phase-advancing capacitors 4 necessary and sufficient to compensate for the predicted maximum reactive power load Qfmax.

  In step S40, the control unit 18 acquires the current combination of turning on and releasing the plurality of phase advance capacitors 4 from the phase advance capacitor DB11. In step S41, the control unit 18 compares the current combination of input and release acquired in step S40 with the combination of input and release determined in step S33 or S39, and newly inputs and releases. The power advance capacitor 4 is extracted. Then, the control unit 18 sends an on / off command (control command) to the switch 4 a of the phase advance capacitor 4.

  According to the phase advance capacitor controller 1 and the power factor adjuster 100 according to the present embodiment as described above, as shown in FIG. 9, when the current t is before t1 where the variation of the reactive power load is small. Compensates the reactive power load at that time. Further, when the current t is between t1 and t2 where the fluctuation of the reactive power load is large, the maximum reactive power load Qfmax is predicted and the maximum reactive power load Qfmax is compensated. That is, in this case, as in the first embodiment, the frequency of control of the phase advance capacitor 4 can be suppressed, and power factor compensation can be performed quickly. Further, when the current t is after t2 when the fluctuation of the reactive power load is small, the reactive power load at that time is compensated. As described above, according to the present embodiment, only when the reactive power load changes abruptly, the maximum reactive power load Qfmax is predicted to control the turning on and off of the plurality of phase-advancing capacitors 4. The rate can be compensated more appropriately.

  In the above description, the load fluctuation initial motion detection unit 21 performs the process of acquiring the current reactive power load Q (t) from the load calculation unit 12 in step S34. However, the present invention is not limited to this. You may go on.

  1 phase advance capacitor control device, 2 power receiving point, 3 reactive power measuring device, 4 phase capacitor, 4a switch, 14 load fluctuation DB, 15 fluctuation statistical processing section, 16 maximum load prediction section, 17 input decision section, 18 control , 21 Load fluctuation initial motion detection unit, 100 Power factor adjuster.

Claims (5)

A phase-advancing capacitor control device that performs control to selectively turn on and open a plurality of phase-advancing capacitors having different capacities on the load side of the power receiving point based on reactive power measured at a power receiving point of a commercial system. ,
A variation statistical processing unit that performs statistical processing on the actual change in reactive power load that is the difference between the reactive power and the capacity of the phase advance capacitor that was input when the reactive power was obtained;
Maximum load that predicts the maximum reactive power load that is the maximum reactive power load until the future after a predetermined time from the present, based on the current reactive power load and the result of the statistical processing in the fluctuation statistical processing unit A predictor;
An input determination unit that determines a combination of input and release of the plurality of phase advance capacitors capable of compensating for the maximum reactive power load predicted by the maximum load prediction unit;
A phase-advanced capacitor control device comprising: a control unit that performs control to input and release the plurality of phase-advancing capacitors based on the combination determined by the input determination unit. The phase advance capacitor controller according to claim 1,
The change history of the reactive power load is calculated for each predetermined period defined as a difference between the reactive power load at a past time point from the present to a predetermined time period and the maximum reactive power load from the past time point to the present time. Including the fluctuation range of
The fluctuation statistics processing unit
Perform statistical processing to obtain the average and standard deviation of the fluctuation range,
The maximum load predicting unit predicts the maximum reactive power load from the current reactive power load, the average, and the standard deviation based on the equation (1).
Maximum reactive power load = (current reactive power load) + (average) + α × (standard deviation) (1)
Where α is an arbitrary coefficient of 1 or more The phase advance capacitor controller according to claim 1 or 2,
A load fluctuation database for storing the result of the statistical processing in the fluctuation statistical processing section for each time zone and for each level of the reactive power load;
The maximum load prediction unit
The result of the statistical processing stored in the load fluctuation database corresponding to the current time zone and the level of the current reactive power load is acquired as a result of the latest statistical processing, and the result of the latest statistical processing; A phase advance capacitor controller that predicts the maximum reactive power load from the current reactive power load. The phase advance capacitor controller according to claim 1 or 2,
A load fluctuation database for storing the result of the statistical processing in the fluctuation statistical processing section for each time zone and for each level of the reactive power load;
The maximum load prediction unit
The result of the statistical processing stored in the load fluctuation database corresponding to the current time zone and the level of the current reactive power load is acquired as a result of the latest statistical processing, and the result of the latest statistical processing; Predicting the maximum reactive power load from the current reactive power load;
It is detected whether the first difference between the present reactive power load and the reactive power load at the first time point before the predetermined period from the current time is equal to or greater than a predetermined value, and the reactive power load at the first time point A load fluctuation initial motion detection unit for detecting whether a second difference from the reactive power load at a second time point before the predetermined period from the first time point is equal to or greater than the predetermined value;
When the load fluctuation initial motion detection unit detects that the first difference is equal to or greater than the predetermined value and the second difference is smaller than the predetermined value, the maximum load prediction unit performs the latest statistical processing. While predicting the maximum reactive power load from the result and the current reactive power load, the input determination unit and the control unit are operated,
When the load fluctuation initial motion detection unit detects that the first difference is smaller than the predetermined value, the input determination unit inputs the plurality of phase advance capacitors capable of compensating the current reactive power load. And a phase-advanced capacitor control device that determines a combination of the phase-opening and opens the plurality of phase-advancing capacitors based on the combination. A phase-advancing capacitor control device according to any one of claims 1 to 4,
A reactive power measuring instrument for measuring the reactive power at the power receiving point;
A plurality of phase advance capacitors,
For the phase advance capacitor,
A power factor adjuster provided with a switch that opens and closes to open and close the phase advance capacitor in accordance with control of the control unit.

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