JP7228905B2 - Voltage regulator, voltage regulation method and program - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act General Incorporated Association The Institute of Electrical Engineers of Japan, Materials of the Institute of Electrical Engineers of Japan, September 19, 2019, pp. 43 to 47, "Photovoltaic power generation using a remote voltage controller (RVC) Interconnection point voltage control by PCS for

The present invention relates to a voltage regulating device, a voltage regulating method and a program, and more particularly to a voltage regulating device and the like for regulating the output voltage of power generation equipment.

Conventionally, electric power companies had a policy of installing a phase modifying facility (SVC; static var compensator) at each power receiving point as a basic request to photovoltaic power generation companies (Non-Patent Document 1 reference). This was a policy to prevent fluctuations in the output of the photovoltaic power generation equipment from affecting the grid.

Kazunobu Kanazawa, "Introduction to Static Var Compensator (SVC)", Journal of the Institute of Electrical Installation Engineers of Japan, May 2013, Vol.33, No.5, pp.341-342

However, installing a voltage adjustment facility at each power receiving point requires a large cost of hundreds of millions of yen (100 million yen/MVar), which imposes a heavy burden on power generators.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a voltage regulator or the like that enables a significant reduction in costs for power generators.

A first aspect of the present invention is a voltage regulator that regulates the output voltage of a power generation facility, wherein a power factor control command is sent via a communication line to a power conditioner that regulates the output of the power generation facility. A voltage regulator comprising a remote power factor commander that outputs

A second aspect of the present invention is the voltage regulating device according to the first aspect, further comprising a remote output command section that issues an output control command to the power conditioner via the communication line.

A third aspect of the present invention is the voltage regulating device according to the second aspect, wherein the measured voltage value, which is the measured value of the system voltage, is within a predetermined range with respect to the reference voltage value for the power conditioner. a dead band commanding unit for commanding a dead band range in which no command is given from the remote output command unit if within the dead band range; and a dead band determining unit for determining whether or not the measured voltage value is within the dead band range. , wherein the remote power factor command unit issues a command to the power conditioner even while it is within the range of the dead zone.

A fourth aspect of the present invention is the voltage regulating device according to the third aspect, further comprising a priority control determination unit for determining which of power factor and output control should be prioritized for the power conditioner. The priority control determination unit determines which of the power factor control and the output control should be prioritized based on the magnitude relationship between the measured voltage value and the reference voltage value.

A fifth aspect of the present invention is the voltage regulating device according to the third or fourth aspect, wherein the moving average command section gives a moving average period command for calculating the reference voltage value by moving average of the commercial voltage. and the moving average command unit issues a command to set the moving average period to within 30 seconds.

A sixth aspect of the present invention is the voltage regulating device according to any one of the first to fifth aspects, in which a command is given to a plurality of power conditioners, and power generation of a plurality of power generation equipment A power generation efficiency calculation unit that calculates efficiency and a power generation efficiency comparison unit that compares the power generation efficiencies of a plurality of power generation equipment, and the remote power factor command unit adjusts the power generation equipment with high power generation efficiency. A command to preferentially increase the power factor is issued to the power conditioner.

A seventh aspect of the present invention is a voltage regulating method using a voltage regulator for regulating the output voltage of a power generation facility, wherein the voltage regulator is for a power conditioner that regulates the output of the power generation facility. and a remote power factor command unit for issuing a power factor control command via a communication line, wherein the remote power factor command unit issues a power factor control command to the power conditioner via the communication line. A voltage regulation method including a remote power factor command step that outputs

An eighth aspect of the present invention is the voltage regulating method according to the seventh aspect, wherein the voltage regulating device remotely outputs an output control command to the power conditioner via the communication line. A command section is further provided, and the remote output command section further includes a remote output command step of issuing an output control command to the power conditioner.

A ninth aspect of the present invention is the voltage adjustment method according to the eighth aspect, wherein the voltage adjustment device adjusts the measured voltage value, which is the measured value of the system voltage, to the reference voltage value for the power conditioner. a dead zone command unit for commanding a range of a dead band in which no command is given from the remote output command unit if the measured voltage value is within a predetermined range; before the remote power factor command step, the dead zone commanding unit instructing the power conditioner the range of the dead zone; and the dead zone determination and a dead zone determination step of determining whether the measured voltage value is within the dead zone range, and in the remote power factor command step, the remote power factor commanding part determines whether the measured voltage value is within the range of the dead zone. The power factor control command is issued even when the value is out of the dead band, and in the remote output command step, the remote output command unit controls the output only when the measured voltage value is out of the dead band. Issue a control command.

A tenth aspect of the present invention is the voltage regulating method according to the eighth or ninth aspect, wherein the voltage regulating device prioritizes which control, power factor or output, for the power conditioner. The priority control determination unit prioritizes control of either the power factor or the output based on the magnitude relationship between the measured voltage value, which is the measured value of the system voltage, and the reference voltage value. It further includes a priority control determination step of determining whether or not.

An eleventh aspect of the present invention is the voltage adjustment method according to the ninth aspect, wherein the voltage adjustment device provides a moving average period instruction for calculating the reference voltage value by moving average of the commercial voltage. An average instruction section is further provided, and the moving average instruction section further includes an activation average period instruction step of issuing an instruction to set the moving average period to within 30 seconds before the dead zone determination step.

A twelfth aspect of the present invention is the voltage adjustment method according to any one of the seventh to eleventh aspects, wherein the voltage adjustment device gives commands to a plurality of power conditioners, and a plurality of and a power generation efficiency comparison unit for comparing the power generation efficiencies of the plurality of power generation facilities, wherein the power generation efficiency is calculated before the remote power factor command step a power generation efficiency calculation step in which the calculation unit calculates the power generation efficiency of the plurality of power generation equipment; and a power generation efficiency comparison step in which the power generation efficiency comparison unit compares the power generation efficiency of the plurality of power generation equipment, In the remote power factor command step, the remote power factor command unit issues a command to preferentially increase the power factor to the power conditioner that adjusts the power generation equipment with the high power generation efficiency.

A thirteenth aspect of the present invention is a program for causing a computer to execute the voltage adjustment method according to any one of the seventh to twelfth aspects.

According to each aspect of the present invention, by issuing a command from the voltage regulator to an inverter or the like, it becomes unnecessary to install a phase modifying facility for each power receiving point. As a result, the cost for installing the voltage regulator according to the present invention can be reduced to about several tens of millions of yen, and the cost can be greatly reduced to about 1/10.

In the past, power conditioners were instructed to "output at ~% of the rated voltage", and the output was changed according to the output of the solar cell from moment to moment. In order to meet the demand from the power company, it was necessary to adjust the output voltage as a reference. The present invention has been conceived to raise the selling price of electricity as much as possible by increasing the effective power, particularly by adjusting the power factor in an inverter.

According to the third or eighth aspect of the present invention, it is possible to control the voltage while minimizing the effect on the active power. In particular, it is possible to raise the selling price of electricity as much as possible by increasing the effective power by adjusting the power factor even while it is in the dead zone, which is not problematic in terms of requests from electric power companies.

According to the fourth or ninth aspect of the present invention, it becomes easy to keep the measured voltage value within the range of the dead band without lowering the output of the power generation equipment as much as possible. Therefore, it becomes easier to achieve both the power generation efficiency of the power generation equipment and the reduction of the impact on the system.

According to the fifth or tenth aspect of the present invention, by following the moving average of the commercial voltage, it becomes easier to meet requests from electric power companies. Usually, it is possible to avoid hunting by setting a slow moving average period such as every 30 minutes. Even if the voltage is changed at night, it becomes easier to quickly follow.

According to the sixth or twelfth aspect of the present invention, it becomes easier to achieve both the power generation efficiency of the power generation equipment and the reduction of the impact on the system.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the structural example of the solar power plant 1 containing the voltage regulator 11 which concerns on the Example of this invention. 4 is a flow chart showing an example of the operation of the voltage regulator 11; FIG. FIG. 4 is a diagram showing the relationship between a reference voltage value and PQ control; 4 is a diagram showing an example of a tool screen on which the voltage regulator 11 controls the power conditioner 5; FIG. 4 is a flow chart showing an example of an automatic voltage control flow of the voltage regulator 11; FIG. FIG. 4 is a diagram showing an example of reference voltage designation in a schedule operation mode; FIG. It is a figure which shows the voltage control performance using the voltage regulator 11 of this invention. FIG. 8 is a diagram showing voltage control results obtained by further improving the voltage control of FIG. 7; FIG. 8 is a diagram showing the result of performing the voltage control of FIG. 7; FIG. 9 is a diagram showing the result of performing the voltage control of FIG. 8;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment of this invention is not limited to the following examples.

FIG. 1 is a diagram showing an overview of a configuration example of a solar power plant 1 including a voltage regulator 11 (an example of a "voltage regulator" in the claims of the present application) according to an embodiment of the present invention.

The solar power plant 1 includes a solar cell module 3, a power conditioner (PCS) 5 (an example of a "power conditioner" in the claims of the present application), a transformer 7, a power receiving and transforming facility 9, and a voltage regulator. A device 11 is provided. The solar cell module 3 receives sunlight and generates power. The power conditioner 5 converts the direct current output from the solar cell module 3 into alternating current and controls the output. The transformer 7 converts the output voltage from the power conditioner 5 into a voltage that matches the system. The power receiving and transforming equipment 9 transforms a high voltage into a voltage that can be safely transmitted in an urban area, and receives power so that it can be used in general households. A multimeter 10 included in the power receiving and transforming equipment 9 performs various measurements.

The voltage regulator 11 (hereinafter referred to as the RVC device) performs optimization control of the grid interconnection voltage of the solar power plant 1 . Specifically, the voltage regulator 11 controls the power conditioner (PCS) 5 via the Internet 13 (an example of a “communication circuit” in the claims of the present application) to Optimizing control of the voltage near the connection point of the power system. The voltage regulator 1 includes a data collector 15 , a shared memory 17 and a PCS commander 19 . The PCS command unit 19 includes a calculation unit 21, a remote power factor command unit 23 (an example of a "remote power factor command unit" in the claims of the present application), and a remote output command unit 25 (a "remote output command unit" in the claims of the present application). ), a dead band commanding unit 27 (an example of a “dead band commanding unit” in the claims of the present application), and a moving average commanding unit 29 (an example of a “moving average commanding unit” in the claims of the present application). ), a dead band determination unit 31 (an example of a “dead band determination unit” in the claims of the present application), a priority control determination unit 33 (an example of the “priority control determination unit” in the claims of the present application), and power generation efficiency calculation section (which is an example of a "power generation efficiency calculation section" in the claims of the present application) and a power generation efficiency comparison section (an example of the "power generation efficiency comparison section" in the claims of the present application). The data collection unit collects data from the multimeter 10 or the like. The shared memory 17 stores various data. The PCS command unit 19 issues commands to the power conditioner 5 . The calculation unit 21 performs calculations. The remote power factor command unit 23 issues a power factor control command to the power conditioner 5 . The remote output command unit 25 issues an output control command to the power conditioner 5 . The dead zone command unit 27 issues a command to the power conditioner 5 regarding the range of the dead zone. The moving average command unit 29 issues a command regarding the moving average period of the reference voltage and the measured voltage. The dead zone determination unit 31 determines whether or not the measured voltage is within the dead zone. The priority control determination unit 33 determines which of the power factor control and the output control should be prioritized. The power generation efficiency calculation unit calculates the power generation efficiency of the plurality of power generation facilities. The power generation efficiency comparison unit compares the power generation efficiencies of the plurality of power generation facilities calculated by the power generation efficiency calculation unit.

FIG. 2 is a flow chart showing an example of the operation of the voltage adjustment device 11 (an example of the "voltage adjustment method" in the claims of the present application). The operation of the voltage regulator 11 will be described with reference to FIG. The voltage regulator 11 receives the current voltage value measured by the multimeter 10 (which is an example of the "measured voltage value" in the claims of the present application). Also, the data collection unit periodically communicates with the multimeter 10 and acquires data such as the voltage value, current value, electric energy, frequency, power factor, etc. of the power grid connection in real time (data acquisition step S01). The data collection unit saves the acquired data in the shared memory (data saving step S02). The PCS command unit communicates with each power conditioner 5, and the remote power factor command unit issues a command to change the set value of the power factor to each power conditioner 5, or the remote output command unit issues an output setting. A value change command is issued (PCS command step S03;).

In PCS command step S03, the PCS command unit calculates the average value (moving average voltage value) of the voltage values within a certain past period stored in the memory, and uses it as a reference voltage value ("reference voltage value" in the claims of the present application). is an example of "value").

FIG. 3 is a diagram showing the relationship between the reference voltage value and PQ control. There is a range of allowable deviation values between the current voltage (interconnected power grid voltage) and the reference voltage. The voltage regulator 11 does not perform output control when the current voltage is within the allowable range of the deviation value. This range of allowable deviation values is called a "dead zone" (an example of the "dead zone" in the claims of the present application), and is shown as region C in FIG. .

In FIG. 3, the PCS command unit performs only Q control (power factor control) within plus or minus β% of the reference voltage value. Moreover, when the reference voltage value exceeds plus or minus β%, P control (output control) and Q control are performed. However, even when it is within the range of the dead band, the PCS command unit sets the power factor to 100% as the target value and performs the optimization process.

The dead zone can be adjusted in advance from the tool screen of the voltage regulator 11 via the Internet or the like. FIG. 4 is a diagram showing an example of a tool screen on which the voltage regulator 11 controls the power conditioner 5. As shown in FIG. A dead zone can be set in the "allowable voltage range" in FIG. Table 1 shows an example of parameter settings.

Further, the voltage adjusting device 11 judges the voltage control direction, and after the calculation unit calculates the control amount, issues a command to change the power factor or the output to the power conditioner 5 . In the case of stepping down, priority is given to power factor control, and priority is given to power factor control until the power factor reaches -80%. On the other hand, when the power factor becomes -80%, it switches to the output control priority. In the case of boosting, priority is given to output control, and priority is given to output control until the output reaches 100%. On the other hand, when the output reaches 100%, it switches to power factor control.

Next, automatic voltage control processing of the voltage regulator 11 will be described with reference to FIG. FIG. 5 is a flowchart showing an example of the automatic voltage control flow of the voltage regulator 11. As shown in FIG. First, it is determined whether or not the measured voltage value is within the dead zone. Outside the range of the dead band, the voltage regulator 11 controls the voltage in the schedule operation mode or the commercial voltage follow-up mode. Further, in any operation mode, the power factor optimization process is performed even after entering the dead zone.

FIG. 6 is a diagram showing an example of reference voltage specification in the schedule operation mode. In this operation mode, the voltage regulator 11 performs automatic voltage control according to a predetermined reference voltage schedule (operation pattern). The voltage adjustment device 11 always checks the current time of the system and uses the specified voltage value at that time as the reference voltage to perform voltage control processing. In the schedule operation mode, a 24-hour reference voltage can be set and can be automatically switched according to the season.

Further, in the commercial voltage follow-up operation mode, the calculation unit calculates the reference voltage value by using the moving average of the commercial voltage. Here, the moving average period is set to 1 second. Normally, a longer moving average period of about 30 minutes is set in order to avoid hunting, but it is effective to follow at high speed in order to meet the demand of the electric power company. Also, the difference between the measured voltage value and the reference voltage value is calculated. When the measured voltage value is out of the dead band, the voltage control direction is determined based on the sign of the difference (magnitude relation). Then, the voltage regulator 11 acquires the current power factor and output value of the power conditioner 5, determines the power factor and output control priority based on the voltage control direction, and , power factor or/and output control command. This control process is repeated until the measured voltage value enters the dead zone.

Next, a voltage control command from the voltage regulator 11 to the power conditioner 5 will be described. There are at least two command schemes. The first method is called a relative deviation voltage instruction method, in which the voltage adjustment device 11 gives the power conditioner 5 a deviation value (%) with respect to a central value (reference voltage value). The power conditioner 5 controls the voltage increase/decrease within the range in which the PQ control is permitted so as to approach the dead band.

The second command method is called a direct command method, in which the voltage regulator 11 directly commands specific values for P control (active power control) and Q control (reactive power control) to the power conditioner. Give 5. The power conditioner 5 performs P control and Q control within a possible range until there are no more commands.

Specific control will be described below with reference to FIGS. 7 and 8. FIG. FIG. 7 is a diagram showing voltage control results using the voltage regulator 11 of the present invention. FIG. 8 is a diagram showing a voltage control result obtained by further improving the voltage control of FIG. In either case, the horizontal axis represents P (output [MW]) and the vertical axis represents Q (power factor [%]).

Referring to FIG. 7, the voltage regulator (RVC) of the present invention was applied to a photovoltaic power plant. The solar power plant has a rated output of 5.94 MW (when the power factor is 1), and on the day of the experiment, the amount of solar radiation was such that an output of 4.0 MW, which is 67.3% of the rated output, was obtained.

The optimization conditions were as follows. The optimized administration time interval was three times the RVC administration time interval. For example, an optimization time interval of 9 seconds was used for an RVC time interval of 3 seconds. In addition, the dead zone was set to plus or minus 0.3% of the reference voltage value. The power factor of +80% of the power conditioner is on the LEAD side (the side in which the current phase leads the voltage), and -80% is the LAG side (the side in which the current phase lags the voltage).

Furthermore, the control procedure in the case of optimizing after suppressing the voltage by RVC was as follows.
Step 1: Confirm that the active power is 100% or less, or that the power factor is within the range of 1.0 to 0.8 (power factor lower limit, LAG side).
Procedure 2: Confirm that the current measured voltage value is between the moving average voltage and the dead zone lower limit voltage.

Step 3: (When cutting the active power) First, adjust the active power toward 100%, and then adjust toward the power factor of 1.0 for optimization.
As described above, the technical idea of the present invention is characterized by optimizing the power factor even though it is within the dead zone.

The optimization steps of FIG. 7 are described below. First, as power factor control, control was performed 5%×4 times from a power factor of 100% to −80% (step 5-1). Subsequently, as P control, the output was controlled in steps of 1% from 100% to 78% (step 5-2). Next, as the P optimum control, the output was controlled by 1% from 78% to 100% (step 5-3). Finally, as the power factor optimum control, the control is completed by 1% from -80% to 100% (step 5-4).

Next, the optimization steps of FIG. 8 will be described. First, as power factor control, the same control as in step 5-1 was performed (step 6-1). Next, after reaching the power factor of -80%, P control was performed from 80% to 50% output instead of 100% output (step 6-2). The output change step was set to every 3%, and the time interval was set to 3 seconds. Next, as P optimum control, the output was returned to 100% (step 6-3). The output change step was set to every 3%, and the time interval was set to 9 seconds. Finally, the optimum power factor control is completed by returning the power factor from plus or minus 0.8 to 1 (step 6-4). The step of power factor change was set to every 5%, and the time interval was set to 9 seconds.

Next, the control results of FIGS. 7 and 8 will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a diagram showing the result of performing the voltage control of FIG. Further, FIG. 10 is a diagram showing the result of performing the voltage control of FIG.

With reference to FIG. 9, when viewed over a long period, the measured voltage value is almost within the vicinity of the reference voltage value (within the range of the dead zone), and it can be read that the control is well performed. However, the problem was that it took too long to enter the dead zone after the measured voltage value deviated significantly from the average voltage.

On the other hand, in FIG. 10, when viewed over a long period of time, it is found that the voltage is almost in the vicinity of the reference voltage value (within the range of the dead zone), and it can be read that the control is well performed. In addition, even after the measured voltage value measured by the multimeter 10 largely deviates from the average voltage, the time to enter the dead zone is shortened. This is because the dead zone is settled earlier than the moving average (120 seconds) time, which enables optimization processing.

When the voltage regulator issues a command to the power conditioner, the command may be issued via a communication line other than the Internet.

Further, the power generation efficiency calculation unit may calculate the power generation efficiency of the plurality of power generation facilities before the remote power factor command unit issues the power factor command, and the power generation efficiency comparison unit may compare the power generation efficiencies. In this case, the remote power factor command unit may issue a command to preferentially increase the power factor to the power conditioner that adjusts the power generation equipment with high power generation efficiency. This makes it easier to achieve both the power generation efficiency of the power generation equipment and the reduction of the impact on the grid.

Furthermore, the moving average period may be longer than 1 second, or shorter than 1 second, as long as it can meet the demands of the electric power company.

Furthermore, the voltage regulator of the present embodiment may cooperate with a secondary battery. For example, in the E region of FIG. 3, when it is desired to further increase the voltage without entering the dead zone by the solar cell output control and power factor control, the power stored in the secondary battery is output as a supplement to the P control. good too. As the secondary battery, a sodium ion battery (NAS battery), a redox flow battery, a lithium ion battery, a lead storage battery, or the like can be used.

1; solar power plant, 3; solar cell module, 5; power conditioner, 7; transformer, 9; power receiving and transforming equipment, 11; voltage regulator, 13; , 19; PCS command section, 21; calculation section, 23; remote power factor command section, 25; remote output command section, 27; dead band command section, 29; moving average command section, 31; Judging part

Claims (9)

A voltage regulator that regulates the output voltage of a power generation facility,
A remote power factor command unit that issues a power factor control command via a communication line to a power conditioner that adjusts the output of the power generation equipment ;
a remote output command unit that issues an output control command to the power conditioner via the communication line;
For the power conditioner, a range of a dead zone in which the command is not given from the remote output command unit if the measured voltage value, which is the measured value of the system voltage, is within a predetermined range with respect to the reference voltage value. a commanding dead zone command unit;
a dead zone determination unit that determines whether the measured voltage value is within the range of the dead zone;
The voltage regulator, wherein the remote power factor command unit commands the power conditioner even while it is within the range of the dead band . Further comprising a priority control determination unit for determining which of power factor and output control is prioritized for the power conditioner,
2. The voltage regulating device according to claim 1 , wherein said priority control determination unit determines which of power factor control and output control should be prioritized based on a magnitude relationship between said measured voltage value and said reference voltage value. further comprising a moving average command unit that gives a moving average period command for calculating the reference voltage value by moving average of the commercial voltage,
3. The voltage regulator according to claim 1 , wherein said moving average command section issues a command to set said moving average period within 30 seconds. Giving a command to the plurality of power conditioners,
a power generation efficiency calculation unit that calculates the power generation efficiency of the plurality of power generation facilities;
A power generation efficiency comparison unit that compares the power generation efficiency of the plurality of power generation facilities,
4. The voltage adjustment according to any one of claims 1 to 3 , wherein the remote power factor command unit issues a command to preferentially increase the power factor to the power conditioner that adjusts the power generation equipment with the high power generation efficiency. Device. A voltage adjustment method using a voltage adjustment device for adjusting the output voltage of a power generation facility,
The voltage regulator is
A remote power factor command unit that issues a power factor control command via a communication line to a power conditioner that adjusts the output of the power generation equipment ;
a remote output command unit that issues an output control command to the power conditioner via the communication line;
For the power conditioner, a range of a dead zone in which the command is not given from the remote output command unit if the measured voltage value, which is the measured value of the system voltage, is within a predetermined range with respect to the reference voltage value. a commanding dead zone command unit;
a dead zone determination unit that determines whether the measured voltage value is within the range of the dead zone ;
a dead zone command step in which the dead zone command unit commands the range of the dead zone to the power conditioner;
a dead zone determination step in which the dead zone determining unit determines whether or not the measured voltage value is within the range of the dead zone;
a remote power factor command step in which the remote power factor command unit issues a power factor control command to the power conditioner via the communication line;
a remote output command step in which the remote output command unit issues an output control command to the power conditioner;
In the remote power factor command step, the remote power factor command unit issues the power factor control command even when the measured voltage value is outside the range of the dead band,
In the remote output command step, the remote output command unit issues a command to control the output only when the measured voltage value is outside the dead band. The voltage adjustment device further includes a priority control determination unit that determines which of power factor and output control is prioritized for the power conditioner,
The priority control determination unit further includes a priority control determination step for determining which of the power factor and the output should be prioritized based on the magnitude relationship between the measured voltage value, which is the measured value of the system voltage, and the reference voltage value. 6. The voltage regulation method according to claim 5 . The voltage adjustment device further includes a moving average command section that gives a moving average period command for calculating the reference voltage value by moving average of commercial voltage,
7. The voltage adjustment method according to claim 6 , further comprising an activation average period command step in which said moving average command section issues a command to set said moving average period within 30 seconds before said dead zone determination step. The voltage regulator is
Giving a command to the plurality of power conditioners,
a power generation efficiency calculation unit that calculates the power generation efficiency of the plurality of power generation facilities;
A power generation efficiency comparison unit that compares the power generation efficiency of the plurality of power generation facilities,
Prior to said remote power factor command step,
A power generation efficiency calculation step in which the power generation efficiency calculation unit calculates the power generation efficiency of the plurality of power generation equipment;
The power generation efficiency comparison unit further includes a power generation efficiency comparison step of comparing the power generation efficiency of the plurality of power generation equipment,
8. In the remote power factor command step, the remote power factor command unit issues a command to preferentially increase the power factor to the power conditioner that adjusts the power generation equipment having the high power generation efficiency. The voltage adjustment method according to any one of . A program for causing a computer to execute the voltage adjustment method according to any one of claims 5 to 8 .

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