JP6978248B2 - Voltage control equipment installation position evaluation device, voltage control equipment installation position evaluation system, voltage control equipment installation position evaluation method and voltage control equipment installation position evaluation program - Google Patents

Description

The present invention relates to a voltage control device installation position evaluation device, a voltage control device installation position evaluation system, a voltage control device installation position evaluation method, and a voltage control device installation position evaluation program.

Until now, electric power companies have installed voltage control devices such as SVRs (Step Voltage Regulators) in order to compensate for voltage fluctuations in distribution lines due to loads. In addition, electric power companies are also responding to fluctuations in the output of photovoltaic power generation (PV: Photovoltaics) by reviewing the set values of the installed voltage control devices. Here, the review of the set value is, for example, in the case of SVR, adjustment of parameters set in SVR using the line impedance and the target voltage, which are the characteristic impedances of the transmission path from the installation point to the voltage deviation point.

For renewable energy such as solar power generation, a feed-in tariff system has been introduced that obliges electric power companies to procure electricity generated using renewable energy power sources at a fixed price set by the government for a certain period of time. .. With the introduction of this feed-in tariff system, the amount of PV interconnection that photovoltaic power generation gives to the electric power system has increased sharply in recent years. When a large number of renewable energy power sources are introduced, there are concerns about the impact on the power system, such as protection and security of the power system and deterioration of power quality. In particular, in the distribution system, the main issues are considered to be voltage rise due to reverse power flow from the renewable energy power source and voltage fluctuation due to changes in power generation output depending on the weather.

It is difficult to cope with the increase in the influence on the power system due to the rapid increase in the amount of PV interconnection in recent years by adjusting the set value of the voltage control device. Therefore, reviewing the installation position of the SVR and considering additional installation have become urgent matters to be considered.

On the other hand, in recent years, electric power companies have been promoting the introduction of distribution line sensors in order to respond to changes in the power generation output of renewable energy power sources and to advance the automation of distribution. The distribution line sensor is a sensor installed on the distribution line for measuring voltage, current, power factor, effective power flow, ineffective power flow, and the like.

Regarding the installation of the voltage control device in the distribution system, there is a conventional technique for determining the installation position of the voltage adjusting device by using the voltage margin of the distribution line.

Japanese Unexamined Patent Publication No. 2006-296030

However, a powerful method for examining and evaluating the installation position of voltage control equipment such as SVR has not been established. Conventionally, in general, the SVR has often been installed in a place that the administrator considers empirically appropriate. Therefore, it was unclear whether the voltage control device was installed at the optimum position for controlling the voltage of the distribution system.

Further, when the voltage is controlled by using the SVR, the influence of the tap control appears directly on the distribution system, and the voltage fluctuates greatly in a stepwise manner during the control. Therefore, it is difficult to obtain a correlation between the change in the voltage value and the voltage deviation point, and it is difficult to determine the installation position for appropriately adjusting the voltage value.

The disclosed technology has been made in view of the above, and is a voltage control device installation position evaluation device and a voltage control device installation position for obtaining the position of the voltage control device for effectively adjusting the voltage value of the distribution system. It is an object of the present invention to provide an evaluation system, a voltage control device installation position evaluation method, and a voltage control device installation position evaluation program.

In one aspect of the voltage control device installation position evaluation device, the voltage control device installation position evaluation system, the voltage control device installation position evaluation method, and the voltage control device installation position evaluation program disclosed in the present application, the measured value acquisition unit is in the distribution system. Acquires the first information which is the measurement result of the current or the power flow at a plurality of candidate positions where the voltage control equipment is arranged and the second information which is the measurement result of the current or the power flow at the position which is the target of the voltage control by the voltage control equipment. .. The correlation calculation unit is on a quadratic coordinate space in which the points representing the values of the first information and the second information for each candidate position at each time are represented by the values of the first information and the second information on each axis. The approximate straight line of each of the points is determined for each candidate position , and the correlation coefficient for each candidate position is obtained based on the approximate straight line. The sensitivity calculation unit obtains the sensitivity of the change of the first information for each candidate position due to the change of each of the second information represented by the slope of the approximate straight line. In the selection unit, the candidate position where each of the correlation coefficients obtained by the correlation calculation unit is equal to or higher than the first threshold value and the slope of each of the approximate straight lines obtained by the sensitivity calculation unit is equal to or higher than the second threshold value. and selecting as the installation position of the voltage control device in the power distribution system. The notification unit notifies the installation position selected by the selection unit.

In one aspect, the present invention can effectively adjust the voltage value of the power system.

FIG. 1 is a schematic configuration diagram of a distribution system according to the first embodiment. FIG. 2 is a block diagram of a voltage control device installation position evaluation device. FIG. 3 is a graph showing the relationship between the passing current of each candidate position and the passing current of the section including the voltage deviation area. FIG. 4 is a diagram for explaining selection of candidate positions by the selection unit. FIG. 5 is a diagram showing an example of notification information of the installation position. FIG. 6 is a flowchart of the installation position determination process by the voltage control device installation position evaluation device according to the first embodiment. FIG. 7 is a diagram showing the amount of voltage deviation when the SVR is installed at each candidate position according to the present embodiment. FIG. 8 is a schematic configuration diagram of the distribution system according to the second embodiment. FIG. 9 is a diagram showing the correlation coefficient of each candidate position and the slope of the correlation straight line on a rainy day. FIG. 10 is a diagram showing the correlation coefficient of each candidate position and the slope of the correlation straight line on a sunny day. FIG. 11 is a diagram showing an example of notification information of the installation position when the season and the weather are combined. FIG. 12 is a hardware configuration diagram of the voltage control device installation position evaluation device.

Hereinafter, examples of the voltage control device installation position evaluation device, the voltage control device installation position evaluation system, the voltage control device installation position evaluation method, and the voltage control device installation position evaluation program disclosed in the present application will be described in detail with reference to the drawings. .. The following examples do not limit the voltage control device installation position evaluation device, the voltage control device installation position evaluation system, the voltage control device installation position evaluation method, and the voltage control device installation position evaluation program disclosed in the present application.

FIG. 1 is a schematic configuration diagram of a distribution system according to the first embodiment. As shown in FIG. 1, the distribution system 100 according to this embodiment includes a distribution substation 30, an SVR 40, and distribution line sensors 21 to 24. Further, each point represented by a small circle in the distribution system 100 is a node indicating an individual relay point of the distribution path. In particular, high voltage consumers or PVs are installed at the nodes P1, P2, P3 and P4.

The distribution substation 30 adjusts the electric power transmitted from the power plant to a predetermined voltage and transmits the electric power to the distribution system 100.

The SVR 40 is a voltage control device that employs an LDC (Line Drop Compensator) method that controls the voltage on the downstream side to be maintained within an appropriate range by switching taps according to changes in the passing current.

The distribution line sensor 21 is installed in section # 1 of the distribution system 100. The distribution line sensor 21 measures the passing current in section # 1. Further, the distribution line sensor 22 is installed in the section # 2 of the distribution system 100. The distribution line sensor 22 measures the passing current in section # 2. Further, the distribution line sensor 23 is installed in the section # 3 of the distribution system 100. The distribution line sensor 23 measures the passing current in section # 3. Further, the distribution line sensor 24 is installed in the section # 4 of the distribution system 100. The distribution line sensor 24 measures the passing current in section # 4.

Since the distribution line near the terminal of the distribution system is thin and has a large impedance, the vicinity of the terminal included in the section # 4 is an area where voltage deviation is expected and is a target area for voltage adjustment. Then, sections # 1 to # 3 are candidate positions to be additionally installed in the distribution system 100 in order to suppress voltage fluctuations in section # 4. That is, the distribution line sensors 21 to 23 arranged in the sections # 1 to # 3 correspond to an example of the "first measuring instrument". Further, the distribution line sensor 24 arranged in the section # 4 corresponds to an example of the “second measuring instrument”.

In the following, when the distribution line sensors 21 to 24 are not distinguished, they are referred to as distribution line sensors 20. The information of the passing current measured by the distribution line sensor 20 is transmitted to the voltage control device installation position evaluation device 1 shown in FIG. Here, in this embodiment, the configuration in which the information of the passing current is directly sent from the distribution line sensor 20 to the voltage control device installation position evaluation device 1 has been described, but the acquisition method of the voltage control device installation position evaluation device 1 is another method. It may be a method. For example, the information of the passing current measured by the distribution line sensor 20 may be stored in a database owned by the electric power company, and the voltage control device installation position evaluation device 1 may acquire the information from the database.

FIG. 2 is a block diagram of a voltage control device installation position evaluation device. As shown in FIG. 2, the voltage control device installation position evaluation device 1 has a measured value acquisition unit 11, a correlation calculation unit 12, a sensitivity calculation unit 13, a selection unit 14, and a notification unit 15.

The measured value acquisition unit 11 acquires information on the passing current in sections # 1 to # 4 from each of the distribution line sensors 21 to 24. The measured value acquisition unit 11 accumulates information on the passing current at predetermined time intervals in each section # 1 to # 4. The information on the passing current in the sections # 1 to # 3 acquired by the measured value acquisition unit 11 from the distribution line sensors 21 to 23 corresponds to an example of the "first information". Further, the information of the passing current in the section # 4 acquired by the measured value acquisition unit 11 from the distribution line sensor 24 corresponds to an example of the “second information”.

The correlation calculation unit 12 acquires information on the passing current in each section # 1 to # 4 in a predetermined period from the measured value acquisition unit 11. Then, the correlation calculation unit 12 obtains a correlation coefficient representing a linear relationship between the passing current in the sections # 1 to # 3 which are candidate positions and the passing current in the section # 4 including the target area for voltage adjustment. Then, the correlation calculation unit 12 outputs the calculated correlation coefficient of each section # 1 to # 3 to the selection unit 14.

The sensitivity calculation unit 13 acquires information on the passing current in each section # 1 to # 4 in a predetermined period from the measurement value acquisition unit 11. Next, as shown in FIG. 3, the sensitivity calculation unit 13 represents a passing current on a two-dimensional coordinate space representing the relationship between the passing current of each candidate position and the passing current of the section including the voltage deviation assumed area. To plot. FIG. 3 is a graph showing the relationship between the passing current of each candidate position and the passing current of the section including the voltage deviation assumed area. In FIG. 3, the vertical axis represents the passing current of the candidate positions # 1 to # 3, and the horizontal axis represents the passing current of the section # 4 including the voltage deviation assumed area. The circled points in FIG. 3 are points representing the relationship of the passing current in any one of the sections # 1 to # 3. Further, the square points in FIG. 3 are points representing the relationship of the passing current in the other one of the sections # 1 to # 3.

Next, the sensitivity calculation unit 13 obtains an approximate straight line of the points plotted for each section # 1 to # 3. In the following, the approximate straight line for each section # 1 to # 3 obtained by the sensitivity calculation unit 13 is referred to as a “correlation straight line”. For example, as shown in FIG. 3, the sensitivity calculation unit 13 obtains a correlation line 101 for any one of the intervals # 1 to # 3 and a correlation line 102 for the other of the intervals # 1 to # 3. In FIG. 3, only the two correlation lines 101 and 102 are shown, but in reality, the sensitivity calculation unit 13 obtains the respective correlation lines in the intervals # 1 to # 3.

Next, the sensitivity calculation unit 13 obtains the slope of the correlation straight line corresponding to the calculated intervals # 1 to # 3. The slope of this correlation line represents the sensitivity of the passing current in each of the sections # 1 to # 3 to the change in the passing current in the section # 4. For example, in FIG. 3, the slope of the correlation line 101 is larger than the slope of the correlation line 102. In this case, the passing current of the candidate position corresponding to the correlation straight line 101 indicates that the sensitivity is higher than the passing current of the candidate position corresponding to the correlation straight line 102.

After that, the sensitivity calculation unit 13 outputs the slope of the correlation straight line of each of the obtained sections # 1 to # 3 to the selection unit 14.

The selection unit 14 stores in advance a correlation threshold value, which is a threshold value for determining whether or not the passing current in each section # 1 to # 3 has a significant correlation with the passing current in section # 4. For example, the selection unit 14 has “0.6” as the correlation threshold value.

Further, the selection unit 14 sets a sensitivity threshold value, which is a threshold value for determining whether or not the passing current in each section # 1 to # 3 has sufficient sensitivity for grasping the fluctuation of the passing current in the section # 4. Have in advance. For example, it is preferable that the inclination is 1 or more in order to obtain sufficient sensitivity, and in that case, the selection unit 14 has “1” as the sensitivity threshold value.

The selection unit 14 receives input of the correlation coefficient of each section # 1 to # 3 from the correlation calculation unit 12. Further, the selection unit 14 receives an input of the slope of the correlation straight line of each section # 1 to # 3 from the sensitivity calculation unit 13.

Next, the selection unit 14 determines whether or not the correlation coefficient of each of the sections # 1 to # 3 is equal to or greater than the correlation threshold value. When the correlation coefficients of the sections # 1 to # 3 are all less than the correlation threshold value, the selection unit 14 outputs a notification that the setting position of the SVR cannot be determined to the notification unit 15.

On the other hand, when there is a correlation coefficient having a value equal to or higher than the correlation threshold among the correlation coefficients in the sections # 1 to # 3 which are candidate positions, the selection unit 14 is equal to or higher than the correlation threshold in the sections # 1 to # 3. Identify candidate positions that have a value correlation coefficient.

Next, the selection unit 14 specifies a candidate position whose correlation straight line is equal to or higher than the sensitivity threshold value among the specified candidate positions as the installation position. Then, the selection unit 14 outputs the information of the specified installation position to the notification unit 15. For example, when the correlation coefficient of the section # 1 is equal to or higher than the correlation threshold value and the slope of the correlation straight line is equal to or higher than the sensitivity threshold value, the selection unit 14 outputs a notification that the section # 1 is the installation position to the notification unit 15. do. Further, the selection unit 14 may determine a priority within the specified installation position and output the installation position information together with the priority information to the notification unit 15. For example, the selection unit 14 may output to the notification unit 15 with higher priority in descending order of sensitivity.

FIG. 4 is a diagram for explaining selection of candidate positions by the selection unit. FIG. 4 represents sections # 1 to # 3 which are candidate positions on the horizontal axis. Further, the vertical axis on the left side in FIG. 4 represents the correlation coefficient, and the vertical axis on the right side represents the slope of the correlation straight line.

Graph 103 shows the correlation coefficient of each interval # 1 to # 3. Further, the graph 104 shows the slope of the correlation straight line of each section # 1 to # 3.

As shown in Graph 103, the correlation coefficient has the same value equal to or higher than the correlation threshold value in any of the intervals # 1 to # 3. The slope of the straight line has the largest value when the correlation straight line in the interval # 1 is equal to or higher than the sensitivity threshold value. Therefore, the selection unit 14 specifies the section # 1 as the set position.

When the notification unit 15 receives the input of the notification that the setting position of the SVR cannot be determined from the selection unit 14, the notification unit 15 displays a message on a monitor or the like indicating that it is difficult to determine an appropriate installation position of the SVR. Notify the administrator of the distribution system 100. In this case, the administrator may install the SVR at a position empirically determined to be appropriate from the sections # 1 to # 4. Further, the administrator may install the SVR by turning off the function of fixing the tap and suppressing the voltage fluctuation.

On the other hand, when the selection unit 14 specifies the installation position, the notification unit 15 receives the installation position information from the selection unit 14. Then, the notification unit 15 notifies the administrator of the distribution system 100 by displaying the acquired installation position information on the monitor or the like. For example, when the notification unit 15 receives a notification from the selection unit 14 that the section # 1 is the installation position, the notification unit 15 notifies the administrator of the section # 1 as the distribution position.

Further, the notification unit 15 may receive input of installation position information from the selection unit 12 together with the priority order. In that case, the notification unit 15 may display the notification information 110 shown in FIG. 5 on the monitor by giving priority to the information on whether or not each section is appropriate as the installation position. FIG. 5 is a diagram showing an example of notification information of the installation position. For example, the notification unit 15 circles the section # 1 like the notification information 110 to indicate that the section # 1 is the most suitable as the installation position of the SVR. Further, the notification unit 15 circles the section # 2 to indicate that the section # 2 is the next best installation position of the SVR. Further, the notification unit 15 indicates that the section # 3 is not suitable as an installation position by not adding any symbol to the section # 3. Further, the notification unit 15 may fill the column of the installation position corresponding to the section # 4 with a pattern to indicate that the section 4 includes the area to be adjusted.

In addition to this, for example, when all of sections # 1 to # 3 are suitable as installation positions, the notification unit 15 may notify the administrator at any position where the SVR may be installed.

Next, the flow of the installation position determination process by the voltage control device installation position evaluation device 1 according to the present embodiment will be described with reference to FIG. FIG. 6 is a flowchart of the installation position determination process by the voltage control device installation position evaluation device according to the first embodiment.

The distribution line sensors 21 to 24 measure the passing currents of the sections # 1 to # 4, respectively. The measured value acquisition unit 11 receives the measurement result of the passing current from the distribution line sensors 21 to 24 (step S1). The measured value acquisition unit 11 stores and stores the passing currents of the received sections # 1 to # 4.

The correlation calculation unit 12 acquires information on the passing current in each section # 1 to # 4 in a predetermined period. Then, the correlation calculation unit 12 calculates the correlation coefficient between the passing current of each section # 1 to # 3 which is the candidate position for installing the SVR and the passing current of the section # 4 which is the target position of the voltage adjustment. (Step S2). After that, the correlation calculation unit 12 outputs the calculated correlation coefficient of each section # 1 to # 3 to the selection unit 14.

The sensitivity calculation unit 13 acquires information on the passing current in each section # 1 to # 4 in a predetermined period. Then, the sensitivity calculation unit 13 has two points indicating the relationship between the passing current of each of the sections # 1 to # 3 which are the candidate positions for installing the SVR and the passing current of the section # 4 which is the target position of the voltage adjustment. Plot on a dimensional coordinate space. Further, the sensitivity calculation unit 13 obtains an approximate straight line of the points plotted for each section # 1 to # 3 and uses it as a correlation straight line. Then, the sensitivity calculation unit 13 obtains the slope of the correlation straight line in each section # 1 to # 3 (step S3). After that, the sensitivity calculation unit 13 outputs the information on the slope of the correlation straight line of each of the obtained sections # 1 to # 3 to the selection unit 14.

The selection unit 14 receives input of the correlation coefficient of each section # 1 to # 3 from the correlation calculation unit 12. Further, the selection unit 14 receives input of information on the slope of the correlation straight line of each section # 1 to # 3 from the sensitivity calculation unit 13. Then, the selection unit 14 determines whether or not there is a candidate position in the intervals # 1 to # 3 whose correlation coefficient is equal to or higher than the correlation threshold value (step S4).

When there is a candidate position whose correlation coefficient is equal to or greater than the correlation threshold value (step S4: affirmative), the selection unit 14 selects a candidate position whose correlation coefficient is equal to or greater than the correlation value and whose slope of the correlation straight line is equal to or greater than the sensitivity threshold value. Specify from the sections # 1 to # 3 (step S5). Then, the selection unit 14 outputs the information of the specified candidate position to the notification unit 15.

The notification unit 15 notifies the administrator of the distribution system 100 with the candidate position specified by the selection unit 14 in the sections # 1 to # 3 as the installation position (step S6).

On the other hand, when there is no candidate position whose correlation coefficient is equal to or higher than the correlation threshold value (step S4: negation), the selection unit 14 outputs a notification that the installation position cannot be determined to the notification unit 15. When the notification unit 15 receives a notification from the selection unit 14 that the installation position cannot be determined, the notification unit 15 notifies the administrator of the distribution system 100 that it is difficult to determine an appropriate installation position of the SVR (step S7).

FIG. 7 is a diagram showing the amount of voltage deviation when the SVR is installed at each candidate position according to the present embodiment. FIG. 7 is the result of analysis using the model when the correlation coefficient and the slope shown in FIG. 4 are acquired. As shown in FIG. 7, no matter where the SVR is installed in the sections # 1 to # 3, the amount of power deviation is suppressed as compared with the case where no additional SVR is installed in the distribution path 100. Among them, the case where the SVR is installed in the section # 1 can suppress the power deviation amount most. Then, when the correlation coefficient and the slope shown in FIG. 4 are used, the selection unit 14 sets the installation position as the section # 1. That is, it can be said that the SVR can be installed at the most appropriate candidate position when the arrangement position of the SVR is determined by using the voltage control device installation position evaluation device 1 according to the present embodiment.

As described above, the voltage control device installation position evaluation device according to the present embodiment correlates the passing current of the candidate position where the voltage control device is installed with the passing current of the target position for voltage adjustment, and the passage of the target position. The installation position of the voltage control device is determined using the sensitivity of the passing current at the candidate position to the change in current. In this way, by using the current, it is possible to obtain the correlation and sensitivity of the passing current while suppressing the influence of the operation of the voltage control device already installed, and to specify the appropriate placement position of the voltage control device. be able to. By using the information on the placement position specified by this voltage control device installation position evaluation device, the administrator can place the voltage control device installation position evaluation device at a position where the voltage value can be effectively adjusted, and the distribution system can be used. It is possible to effectively adjust the voltage value of. Further, since it is possible to avoid installing the voltage control device at a position where it is difficult to suppress the voltage fluctuation due to the adjustment, it is possible to reduce the burden of unnecessary adjustment of the voltage control device.

Further, in this embodiment, the correlation and sensitivity of each candidate position are obtained by using the passing current, and the installation position of the voltage control device is determined by using them. However, the influence of the voltage adjustment by the existing SVR is small and the voltage is affected. Information other than current may be used as long as the corresponding correlation and sensitivity can be obtained. For example, active power and reactive power are measured by a high-performance distribution line sensor, the correlation and sensitivity of active power between each candidate position and the target position, and the correlation and sensitivity of reactive power are obtained, and the information is used. , The installation position of the voltage control device may be determined by the same method as in the case of the passing current. In reality, the photovoltaic power generation device may also output reactive power, so it is possible to select a more appropriate installation position by using active power and reactive power than when using passing current. Is. However, even if the installation position of the voltage control device is determined using the passing current that can be measured by a simple distribution line sensor, it is possible to sufficiently specify the appropriate installation position.

FIG. 8 is a schematic configuration diagram of the distribution system according to the second embodiment. The voltage control device installation position evaluation device according to this embodiment is different from the first embodiment in that the installation position is determined by obtaining the correlation and sensitivity according to the weather. The voltage control device installation position evaluation device according to this embodiment is also represented by the block diagram of FIG. Hereinafter, the description of the operation of each part same as that of the first embodiment will be omitted.

Here, the direction in which the electricity output from the distribution substation 30 flows will be described as a premise. In the distribution system 100 according to this embodiment, the distribution line sensor 21 is installed at a position before a large branch of the distribution system 100, that is, at a position where the output of the distribution substation 30 is measured. Further, the distribution line sensor 22 is installed between the large branch and the next branch. Further, the distribution line sensor 23 is arranged upstream of the SVR 40, and the distribution line sensor 24 is installed downstream of the SVR 40. Further, the distribution line sensors 25 and 26 are arranged on the path connected to the PV 52 after being divided into the paths connected to the PV 51 and the PV 52 downstream thereof.

In this embodiment, the area near the end of the distribution system 100 including the PV 52 is actually the area to be controlled, and the sensor 26 is the target position for voltage control. The position where the sensors 21 to 25 are installed is a candidate position to be added to the new SVR. In the following, the slope of the correlation coefficient and the correlation straight line corresponding to the passing current of each candidate position may be referred to as the correlation coefficient of the sensors 21 to 25 and the slope of the correlation straight line.

The correlation calculation unit 12 acquires information on the passing current in each of the sensors 21 to 25 in a predetermined period from the measured value acquisition unit 12. Further, the correlation calculation unit 12 acquires the weather on the day when the information of each passing current is acquired from the database (not shown). Here, for example, a server having a database for holding the weather is owned by the Japan Meteorological Agency or an electric power company.

Next, the correlation calculation unit 12 classifies the weather into sunny days and rainy days. For example, the correlation calculation unit 12 classifies a day when it rains as a rainy day and a day when the amount of clouds is equal to or less than a reference value as a sunny day. Then, the correlation calculation unit 12 acquires information on the passing current in each distribution line sensor 21 to 25 on a rainy day and a sunny day, respectively. After that, the correlation calculation unit 12 represents a correlation coefficient representing a linear relationship between the passing current of each distribution line sensor 21 to 25, which is a candidate position on a rainy day, and the passing current of the distribution line sensor 26 including the target area for voltage adjustment. Ask for. Further, the correlation calculation unit 12 calculates a correlation coefficient representing a linear relationship between the passing current of the distribution line sensors 21 to 25, which is a candidate position on a sunny day, and the passing current of the distribution line sensor 26 including the target area for voltage adjustment. demand. Then, the correlation calculation unit 12 outputs the calculated correlation coefficient of each distribution line sensor 21 to 25 on a rainy day and a sunny day to the selection unit 14.

The sensitivity calculation unit 13 acquires information on the passing current in each distribution line sensor 21 to 25 in a predetermined period. Further, the correlation calculation unit 12 acquires the weather on the day when the information of each passing current is acquired from the database (not shown). Next, the sensitivity calculation unit 13 divides the information of the passing current in each distribution line sensor 21 to 25 on a rainy day and a sunny day. After that, the sensitivity calculation unit 13 divides into rainy day and sunny day, and represents the passing current on the two-dimensional coordinate space showing the relationship between the passing current of each candidate position and the passing current of the section including the voltage deviation area. Plot the points.

Next, the sensitivity calculation unit 13 obtains a correlation straight line of each distribution line sensor 21 to 25 on a rainy day. Then, the sensitivity calculation unit 13 obtains the inclination of the correlation straight line of each distribution line sensor 21 to 25 on a rainy day. Further, the sensitivity calculation unit 13 obtains a correlation straight line of each distribution line sensor 21 to 25 on a sunny day. Then, the sensitivity calculation unit 13 obtains the inclination of the correlation straight line of each distribution line sensor 21 to 25 on a sunny day.

After that, the sensitivity calculation unit 13 outputs the information on the inclination of the correlation straight line of each distribution line sensor 21 to 25 on the obtained rainy day and sunny day to the selection unit 14.

The selection unit 14 receives input of the correlation coefficient of each distribution line sensor 21 to 25 on a rainy day and a sunny day from the correlation calculation unit 12. Further, the selection unit 14 receives input of information on the inclination of the correlation straight lines of the distribution line sensors 21 to 25 on rainy and sunny days from the sensitivity calculation unit 13.

Then, in the selection unit 14, the distribution line sensors 21 to 25 are arranged at candidate positions where the correlation coefficient of the passing current is equal to or higher than the correlation threshold value and the sensitivity of the passing current is equal to or higher than the sensitivity threshold value on rainy days and selection days. Identify from the position. Then, the selection unit 14 notifies the notification unit 15 of the specified candidate position.

For example, the selection unit 14 acquires the information shown in FIG. 9 as the correlation coefficient and the slope of the correlation straight line of each distribution line sensor 21 to 25 on a rainy day. FIG. 9 is a diagram showing the correlation coefficient of each candidate position and the slope of the correlation straight line on a rainy day. FIG. 9 shows distribution line sensors 21 to 25 which are candidate positions on the horizontal axis. Further, the vertical axis on the left side in FIG. 9 represents the correlation coefficient, and the vertical axis on the right side represents the slope of the correlation straight line. Then, the graph 201 shows the slope of the correlation straight line. Further, the graph 202 represents the correlation coefficient.

In FIG. 9, the points included in the region surrounded by the broken line 203 indicate that the correlation coefficient is equal to or greater than the correlation threshold value and the slope of the correlation straight line is equal to or greater than the sensitivity threshold value. Therefore, the selection unit 14 selects the distribution line sensors 23 to 25 as candidate positions where the SVR can be installed.

Further, the selection unit 14 acquires the information shown in FIG. 10 as the correlation coefficient of each distribution line sensor 21 to 25 and the slope of the correlation straight line on a sunny day. FIG. 10 is a diagram showing the correlation coefficient of each candidate position and the slope of the correlation straight line on a sunny day. FIG. 10 shows distribution line sensors 21 to 25 which are candidate positions on the horizontal axis. Further, the vertical axis on the left side in FIG. 10 represents the correlation coefficient, and the vertical axis on the right side represents the slope of the correlation straight line. Then, graph 204 shows the slope of the correlation straight line. Further, the graph 205 represents the correlation coefficient.

In FIG. 10, the points included in the region surrounded by the broken line 206 indicate that the correlation coefficient is equal to or greater than the correlation threshold value and the slope of the correlation straight line is equal to or greater than the sensitivity threshold value. Therefore, the selection unit 14 selects the distribution line sensor 25 as a candidate position where the SVR can be installed.

After that, the selection unit 14 identifies the candidate position where the SVR can be installed on both rainy and sunny days. For example, in the case of FIGS. 9 and 10, the selection unit 14 specifies the distribution line sensor 25 as the installation position. After that, the selection unit 14 notifies the notification unit 15 of the information of the candidate position specified as the installation position.

As described above, the voltage control device installation position evaluation device according to the present embodiment divides the cases according to the weather, obtains the correlation coefficient of each candidate position and the slope of the correlation straight line in each case, and obtains them. It is used to determine the installation position of the voltage control device. Since the amount of power generated by PV is largely influenced by the weather, it is conceivable that the correlation and sensitivity of the passing current will change depending on the weather. From this, by using the voltage control device installation position evaluation device according to this embodiment, it is possible to obtain the correlation and sensitivity of each candidate position with higher accuracy, and to specify the more appropriate voltage control device installation position. be able to.

(Modification example)
Further, in the second embodiment, the voltage control device installation position evaluation device 1 uses rainy days and sunny days as the weather, but the classification using other information having a large influence on the amount of electricity used (including the amount of power generation). May be used. For example, the voltage control device installation position evaluation device 1 may use a maximum day in which the flow of clouds is fast and the weather changes drastically, in addition to the rainy day and the sunny day. When the weather changes drastically, for example, the amount of power generated by PV is different from that on rainy or sunny days. Therefore, the voltage control device installation position evaluation device 1 can determine a more appropriate installation position by distinguishing the maximum day from other days and obtaining the correlation and sensitivity.

In addition to the weather, classification using other information that has a large influence on the amount of electricity used (including the amount of power generation) may be used. For example, since the amount of electricity used and the amount of power generation differ depending on the season, the voltage control device installation position evaluation device 1 may be classified according to the season to obtain the correlation and the sensitivity. Further, the voltage control device installation position evaluation device 1 may obtain the correlation and sensitivity by combining the season and the weather.

FIG. 11 is a diagram showing an example of notification information of the installation position when the season and the weather are combined. The notification information 210 is a candidate position for a section including 10 sections between each node of the straight distribution path including sections # 1 to S3 in FIG. 1 and a rising section from the distribution substation 30 to the first node. It is the notification information of the installation position when the evaluation process of the installation position is performed.

In the notification information 210, the case where the load is light indicates the spring and autumn seasons. When the load is high, it represents the summer and winter seasons. Then, in this case, the voltage control device installation position evaluation device 1 obtains and evaluates the correlation and sensitivity of each candidate position in the case of light load and high load on rainy day, sunny day, and maximum day, respectively. Then, the notification unit 15 displays the notification information 210 on the monitor or the like to indicate what kind of evaluation result is obtained in each section for each classification, and notifies an appropriate candidate position as the arrangement position.

In the notification information 210, the area represented by the fine dots represents a section in which the evaluation result is appropriate. The appropriate evaluation result means, for example, that the correlation coefficient and the slope of the correlation straight line are values such that the correlation coefficient is equal to or higher than the correlation threshold and the slope of the correlation straight line is equal to or higher than the good threshold set above the sensitivity threshold. If you have. Further, in the notification information 210, the area represented by the coarse dots represents a section in which the evaluation result is slightly appropriate. The evaluation result is somewhat appropriate. For example, a value in which the correlation coefficient is equal to or higher than the correlation threshold and the slope of the correlation straight line is less than the good threshold set above the sensitivity threshold is the slope of the correlation coefficient and the correlation straight line. Is the case. The area represented by the diagonal line is the section that is the target position for voltage control.

The selection unit 14 sets an appropriate installation position in a section where there are five or more items for which the evaluation result is appropriate. Then, as shown in the notification information 210, the notification unit 15 notifies the appropriate installation position with a double circle. Further, the selection unit 14 sets a section in which there are two or more items for which the evaluation result is appropriate and two or more items for which the evaluation result is appropriate as the next best installation position. Then, as shown in FIG. 11, the notification unit 15 notifies the installation position of the next best with a single circle.

As described above, it is possible to obtain more accurate correlation and sensitivity information by finely classifying the cases according to the conditions that greatly affect the amount of electricity used, and it is possible to determine a more appropriate installation position.

Further, by displaying the evaluation result of each candidate position under each condition, the administrator can determine the installation position in consideration of the information, and the voltage control device installation position evaluation device according to this embodiment can be used. , Can contribute to the selection of a more appropriate installation position.

(Hardware configuration)
FIG. 12 is a hardware configuration diagram of the voltage control device installation position evaluation device. The voltage control device installation position evaluation device 1 includes a CPU (Central Processing Unit) 91, a memory 92, a hard disk 93, and a network interface 94. The CPU 91 is connected to the memory 92, the hard disk 93, and the network interface 94 by a bus.

The network interface 94 is, for example, an interface for communicating with the distribution line sensor 20.

The hard disk 93 stores various programs including programs for realizing the functions of the measurement value acquisition unit 11, the correlation calculation unit 12, the sensitivity calculation unit 13, the selection unit 14, and the notification unit 15 illustrated in FIG. 2.

The CPU 91 reads from the hard disk 93 various programs including programs for realizing the functions of the measurement value acquisition unit 11, the correlation calculation unit 12, the sensitivity calculation unit 13, the selection unit 14, and the notification unit 15 exemplified in FIG. It is expanded on the memory 92 and executed. As a result, the CPU 91 and the memory 92 realize the functions of the measurement value acquisition unit 11, the correlation calculation unit 12, the sensitivity calculation unit 13, the selection unit 14, and the notification unit 15 illustrated in FIG.

1 Voltage control equipment installation position evaluation device 11 Measurement value acquisition unit 12 Correlation calculation unit 13 Sensitivity calculation unit 14 Selection unit 15 Notification unit 20 to 26 Distribution line sensor 30 Distribution substation 40 SVR
100 Distribution system # 1 to # 4 sections

Claims (4)

The first information which is the measurement result of the current or the power flow at a plurality of candidate positions where the voltage control equipment is arranged in the distribution system, and the second information which is the measurement result of the current or the power flow at the position which is the target of the voltage control by the voltage control equipment. Measurement value acquisition unit to acquire
The points representing the values of the first information and the second information for each candidate position at each time are plotted on the secondary coordinate space in which the values of the first information and the second information are represented by each axis, and the above-mentioned A correlation calculation unit that determines an approximate straight line for each of the points for each candidate position and obtains a correlation coefficient for each candidate position based on the approximate straight line.
A sensitivity calculation unit for obtaining the sensitivity of the change in the first information for each candidate position due to the change in the second information represented by the slope of the approximate straight line.
The power distribution positions the candidate positions where the correlation coefficient obtained by the correlation calculation unit is equal to or higher than the first threshold value and the slope of each approximate straight line obtained by the sensitivity calculation unit is equal to or higher than the second threshold value. A selection unit selected as the installation position of the voltage control device in the system, and
A voltage control device installation position evaluation device including a notification unit for notifying the installation position selected by the selection unit. A voltage control device installation position evaluation system having a first measuring instrument, a second measuring instrument, and a voltage control device installation position evaluation device.
The first measuring instrument measures the current or power flow at a plurality of candidate positions where voltage control equipment is installed in the distribution system.
The second measuring instrument measures the current or power flow at the position targeted for voltage adjustment by the voltage control device, and measures the current or power flow.
The voltage control device installation position evaluation device is
A measurement value acquisition unit that acquires the first information that is the measurement result by each of the first measuring instruments and the second information that is the measurement result of each of the second measuring instruments.
The points representing the values of the first information and the second information for each candidate position at each time are plotted on the secondary coordinate space in which the values of the first information and the second information are represented by each axis, and the above-mentioned A correlation calculation unit that determines an approximate straight line for each of the points for each candidate position and obtains a correlation coefficient for each candidate position based on the approximate straight line.
A sensitivity calculation unit for obtaining the sensitivity of the change in the first information for each candidate position due to the change in the second information represented by the slope of the approximate straight line.
The power distribution is located at the candidate position where each of the correlation coefficients obtained by the correlation calculation unit is equal to or higher than the first threshold value and the slope of each of the approximate straight lines obtained by the sensitivity calculation unit is equal to or higher than the second threshold value. A selection unit selected as the installation position of the voltage control device in the system, and
A voltage control device installation position evaluation system including a notification unit for notifying the installation position selected by the selection unit. Acquire the first information which is the measurement result of the current or the power flow at a plurality of candidate positions to be installed in the voltage control device in the distribution system.
The second information, which is the measurement result of the current or the power flow at the position to be adjusted by the voltage control device, is acquired.
The points representing the values of the first information and the second information for each candidate position at each time are plotted on the secondary coordinate space in which the values of the first information and the second information are represented by each axis, and the above-mentioned An approximate straight line for each of the points is determined for each candidate position, and a correlation coefficient for each candidate position is obtained based on the approximate straight line.
The sensitivity of the change in the first information for each candidate position due to the change in the second information represented by the slope of the approximate straight line is obtained.
The candidate position where each of the correlation coefficients is equal to or higher than the first threshold value and the slope of each of the approximate straight lines is equal to or higher than the second threshold value is selected as the installation position of the voltage control device in the distribution system.
A voltage control device installation position evaluation method comprising notifying the installation position. Acquire the first information which is the measurement result of the current or the power flow at a plurality of candidate positions to be installed in the voltage control device in the distribution system.
The second information, which is the measurement result of the current or the power flow at the position to be adjusted by the voltage control device, is acquired.
The points representing the values of the first information and the second information for each candidate position at each time are plotted on the secondary coordinate space in which the values of the first information and the second information are represented by each axis, and the above-mentioned An approximate straight line for each of the points is determined for each candidate position, and a correlation coefficient for each candidate position is obtained based on the approximate straight line.
The sensitivity of the change in the first information for each candidate position due to the change in the second information represented by the slope of the approximate straight line is obtained.
The candidate position where each of the correlation coefficients is equal to or higher than the first threshold value and the slope of each of the approximate straight lines is equal to or higher than the second threshold value is selected as the installation position of the voltage control device in the distribution system.
A voltage control device installation position evaluation program characterized in that a computer executes a process of notifying the installation position.

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