JP6960340B2 - Distribution system voltage adjustment device, voltage adjustment system, voltage adjustment method and distribution equipment design support system - Google Patents

Description

The present invention relates to a voltage adjustment device, a voltage adjustment system, a voltage adjustment method and a distribution equipment design support system of a distribution system, and solar power generation is particularly performed when the output of a solar power generation device installed in the distribution system is suppressed. The present invention relates to a voltage adjustment device, a voltage adjustment system, a voltage adjustment method, and a distribution equipment design support system of a distribution system that enable control to lower the voltage at a device installation point.

In recent years, the grid interconnection of photovoltaic power generation equipment has increased in the distribution system, but in the distribution system, there is a phenomenon that the voltage at the installation point of the photovoltaic power generation equipment rises as the amount of power generated by the photovoltaic power generation equipment increases. .. In order to avoid this, the photovoltaic power generation device is provided with a function of suppressing the amount of power generated by the photovoltaic power generation device when the own terminal voltage rises above the specified voltage. This function limits the amount of power generated by the photovoltaic power generation device.

On the other hand, the voltage of the distribution system can be adjusted by tap switching of a transformer (LRT: Road Radio Control Transformer) installed in a distribution substation or by an automatic voltage regulator (SVR:) installed on a distribution line. It is controlled by tap switching such as Step Voltage Transformer).

In order to avoid the suppression of the amount of power generated by the photovoltaic power generation device described above, the voltage of the distribution system is adjusted by the voltage regulator (tap changer transformer LRT at load or automatic voltage regulator SVR) to suppress the output. It is important to avoid. For that purpose, it is necessary to appropriately perform tap control according to the amount of power generated by the photovoltaic power generation device.

The following methods are known as control methods for voltage regulators (load tap changer transformer LRT and automatic voltage regulator SVR).

For example, in a normal automatic voltage regulator SVR, a method of determining a tap value from a secondary voltage at its own end, a passing current, and a power factor is known in Non-Patent Document 1.

Patent Document 1 describes the voltage fluctuation range obtained by adding the voltage rise width from the transmission voltage of the voltage adjusting transformer to the voltage at the highest voltage point and the voltage fall width from the transmission voltage of the transformer to the voltage at the lowest voltage point. A control method for selecting the transmission voltage of the voltage regulator so that the center value becomes a specified value is shown.

In addition, the secondary side voltage (tap value) of the automatic voltage regulator SVR is adjusted according to the amount of power generated by the photovoltaic power generation device in the system, and the amount of power generated by the photovoltaic power generation device at that time is automatically adjusted to that of the photovoltaic power generation device. It is known to infer from communication between voltage regulators SVR or solar meter information.

The detailed configuration of the automatic voltage regulator SVR is also described in detail in Non-Patent Document 1. A specific calculation method for multiple regression analysis is also known.

Japanese Unexamined Patent Publication No. 2009-240038

"Advances and Applications of Line Voltage Regulators" Modern Power Distribution Technology, Denki Shoin, pp. 128-134 (1972)

In the method of determining the tap value from the secondary side voltage of the self-end, the passing current, and the power factor according to Non-Patent Document 1 described above, control in consideration of voltage rise and output suppression by the photovoltaic power generation device is not assumed. Therefore, the automatic voltage regulator SVR cannot adjust the voltage in a situation where the voltage rise is avoided by suppressing the output of the photovoltaic power generation device, and there is a problem that the output suppression of the photovoltaic power generation device cannot be avoided.

Further, in the method described in Patent Document 1, in a situation where a voltage rise is avoided by suppressing the output of the photovoltaic power generation device, it is not possible to properly set the line voltage drop compensator of the voltage regulator, and the sun There is a problem that the output suppression of photovoltaic power generation cannot be avoided.

In particular, with the expansion of the interconnection of the mega solar to the end of the distribution system and the interconnection of the photovoltaic power generation equipment of general consumers to the low voltage side, the terminal voltage of the photovoltaic power generation equipment rises, and the photovoltaic power generation of specific consumers There is a problem that the output of the device is suppressed and the loss of power sales opportunity occurs unequally.

Furthermore, when trying to predict the voltage rise at the PV end using all the measured values of the distribution system, it depends on the combination of the power factor of the load of the distribution system and the power factor of PV, and the distribution of the load and PV on the distribution system. , The estimation accuracy of the voltage increase at the PV end is lowered, and the SVR becomes inoperable.

From the above, the present invention enables control such that when the output of the photovoltaic power generation device installed in the distribution system is suppressed, the voltage at the installation point of the photovoltaic power generation device is lowered to eliminate the output suppression. , Provides a voltage regulator for a distribution system, a voltage regulator system, a voltage regulator method, and a distribution equipment design support system.

From the above, in the present invention, "power distribution provided with a transformer with a tap, which is installed in a distribution system provided with a plurality of solar power generation devices and adjusts a tap so that a voltage at a virtual point of the distribution system is set as a set voltage. Time to obtain the voltage, which is the set value of the voltage regulator, which is the voltage regulator of the system and is uniquely determined for the voltage regulator in the predetermined time zone based on the information obtained from the distribution system within the predetermined time zone. A reference means for deriving the voltage for each band, a means for obtaining the amount of solar radiation in a predetermined time zone, a database for storing the impedance and the amount of solar radiation in the same predetermined time zone in association with each other, and a reference by referring to the database based on the reference amount of solar radiation. It is characterized by comprising an impedance extraction means for obtaining the impedance at the time of solar radiation and a tap adjustment means for adjusting a tap so that the voltage at a virtual point of the distribution system is set as a set voltage by using the extracted impedance as a set value. A voltage regulator for the distribution system. "

Further, in the present invention, "a transformer with a tap which is applied to a distribution system provided with a plurality of solar power generation devices and adjusts a tap so that a voltage at a virtual point of the distribution system is set as a set voltage, and a distribution equipment design support system. The voltage adjustment system of the distribution system including the above, and the distribution equipment design support system is a voltage adjustment that is uniquely determined for the distribution system in the predetermined time zone based on the information obtained from the distribution system within the predetermined time zone. A database for storing the impedance derived means for each time zone for obtaining the set value of the device, the solar radiation amount obtaining means for obtaining the solar radiation amount in the predetermined time zone, and the impedance and the solar radiation amount in the same predetermined time zone in association with each other. In addition, the tapped transformer sets the voltage at the virtual point of the distribution system by using the impedance extraction means for obtaining the impedance at the reference solar radiation amount by referring to the database based on the reference solar radiation amount and the extracted impedance as a set value. A voltage adjusting system for a distribution system, which is characterized by being provided with a tap adjusting means for adjusting a tap to obtain a voltage. "

Further, in the present invention, "the voltage of the distribution system provided with a transformer with a tap which is installed in the distribution system provided with a plurality of solar power generation devices and adjusts the tap so that the voltage at the virtual point of the distribution system is the set voltage". It is an adjustment method, and based on the information obtained from the distribution system within the predetermined time zone, the impedance, which is the set value of the voltage regulator, which is uniquely determined for the distribution system in the predetermined time zone, is obtained, and the predetermined time zone. In The voltage adjustment method of the distribution system is characterized in that the tap is adjusted so that the voltage at the virtual point of the distribution system is set as the set voltage by using the measured impedance as a set value. "

Further, the present invention is applied to a distribution system including a plurality of solar power generation devices and a transformer with a tap that adjusts a tap so that a voltage at a virtual point of the distribution system is set as a set voltage according to a given set value. This is a distribution facility design support system for a distribution system that gives a set value for estimating the voltage at the virtual point, and the effective passing current of the tapped transformer is used as information obtained from the distribution system within a predetermined time zone. Based on the components and invalid components, and the potential difference between the tapped transformer and the plurality of solar power generation devices, the impedance, which is the set value of the voltage regulator, which is unique to the distribution system in the predetermined time zone, is obtained. A means for deriving an impedance for each time zone, a means for obtaining a solar power output for obtaining a solar power output in a predetermined time zone, and a database for storing the impedance and the solar power output in the same predetermined time zone in association with each other are provided from the database. A power distribution facility design support system for a power distribution system, which comprises an output means for applying the extracted impedance to the tapped transformer. "

According to the voltage adjusting device and the control method of the distribution system of the present invention, the voltage deviation of the distribution system can be reduced even in a system in which a large amount of photovoltaic power generation or the like is introduced. There is an effect that the loss of power selling opportunity can be reduced by reducing the output suppression amount of a specific photovoltaic power generation. Furthermore, by selecting and using the set value of the voltage adjusting device associated with the amount of solar radiation, it is possible to adjust the voltage with higher accuracy and reduce the amount of suppression of the output of sunlight.

In addition, other effects of the present invention will be described in the specification.

The figure which shows the whole structure of the distribution equipment design support system which concerns on this invention. Explanatory drawing which shows the configuration example of a general distribution system and a voltage adjustment system. The figure which shows the structure of the tap control device of the automatic voltage regulator SVR. A processing flow diagram that avoids suppression of photovoltaic power generation output by tap control operation. The figure which shows the data flow of a measuring means and a distribution equipment design support system. The figure which shows the structure when the facility design support system 400 is configured by a computer. A flow showing the processing content of the on-plane division section determination means 440 in the equipment design support system 400. A flow showing the processing contents of the upper rank ΔV extraction means 460 in the equipment design support system 400. A flow showing the processing contents of the multiple regression analysis means 480 in the equipment design support system 400. The figure which shows the geometric image of α and β obtained in FIG. The figure which shows the Example which provided the SVR set value determination means 400A in the automatic voltage regulator SVR. It is a figure which shows the area composition example of the area of the distribution system which is extended and arranged in a dendritic shape through an automatic voltage regulator SVR. The figure which shows only the photovoltaic power generation apparatus PV which correlates with the output suppression in the photovoltaic power generation apparatus PV. The figure which shows the concept of 3D space by Irsvr, Iisvr and ΔV. The figure which shows the positional relationship of the plane obtained by the multiple regression analysis means by the extracted data. The figure which shows the relationship between the effect of the conventional method and the proposed method in this invention. The figure which shows the set value selection part in SVR. The figure which shows the processing of the means corresponding with the amount of solar radiation and the set value in an equipment planning support system.

Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing a configuration example of a general distribution system and a voltage adjustment system. A typical distribution system 100 shown in FIG. 2 is a node (bus) 120, a distribution line 140 connecting them, a load 150 connected to the node 120, a photovoltaic power generation device PV, and a sensor installed in the distribution line 140. It is composed of 170, a distribution substation 110, and the like. Here, the left side of the drawing in which the distribution substation 110 is located is the sending side of the feeder, and the right side is the end side of the feeder.

The automatic voltage adjusting device 300 is a voltage adjusting device that is installed in series with the line 140 and adjusts the line voltage. Examples of the automatic voltage regulator 300 include a load tap changer transformer LRT and an automatic voltage regulator SVR, but here, an example in which the automatic voltage regulator SVR is arranged as the voltage regulator 300 is shown. The automatic voltage regulator SVR may be a load tap switching transformer (LRT: Road Radio Control Transformer) in a distribution substation, but in FIG. 2, as illustrated by the automatic voltage regulator 300, for example, it is simple. A transformer 305 composed of a winding transformer and a tap changer, an automatic voltage regulator SVR provided with a control portion 310, a signal from a sensor 170 installed on a distribution line, and a distribution equipment design support system 400. The tap is operated using the motion settling value 350.

Further, in FIG. 2, reference numeral 400 denotes a power distribution equipment design support system, which appropriately obtains inputs from various measuring means 200 including a sensor 170 and gives an operation setting value 350 to the automatic voltage adjusting device 300. Although FIG. 2 shows a distribution system 100 having a simple configuration, in reality, automatic voltage adjusting devices 300 are appropriately provided in various places of a plurality of feeders, and the distribution equipment design support system 400 is provided with each automatic voltage adjusting device 300. On the other hand, the optimum operation settling value 350 at each installation location is determined and given.

As illustrated in FIG. 2, the voltage adjusting system in the present invention has an overall configuration including an automatic voltage adjusting device 300 and a power distribution equipment design support system 400, but in the embodiment of the present invention, the automatic voltage adjusting device 300 The function of the power distribution equipment design support system 400 illustrated in FIG. 1 may be included in itself and integrated as a voltage adjusting device.

FIG. 1 shows the overall configuration of the power distribution equipment design support system according to the present invention. Power distribution equipment design support system 400, for its internal processing, a variety of measuring means 200 including a sensor 170, a reactive component _Ii and active ingredient _{Ir SVR} of current passing through the automatic voltage regulator SVR _SVR (or active power _{P SVR} And the reactive power Q _SVR ), the potential difference ΔV between the automatic voltage regulator SVR installation point and the solar power generation device PV installation point, the amount of solar radiation, etc. are acquired.

The power distribution equipment design support system 400 is generally configured as a computer system, but when its function is expressed as a means, the plane division section determination means 440, the upper rank ΔV extraction means 460, the multiple regression analysis means 480, It is composed of means for corresponding the amount of solar radiation and the settling value 500, a database DB3, a database DB4, a database DB5, and the like.

The database DB3 stores various data obtained by calculating the voltage ΔVlim that contributes to the suppression of the photovoltaic power generation output from the SVR passing currents Irsvr and Iisvr measured in the target distribution system and the voltage difference ΔV. Further, in the database DB3, in addition to the measured values for each input time, the target distribution system, the SVR arrangement, the arrangement / capacity of the photovoltaic power generation equipment, the load pattern, etc. are appropriately given and stored from the database DB4.

In the database DB5, many SVR set values R2 and X2 calculated based on the past results are stored in association with the time zone and the information on the amount of solar radiation in the time zone.

The databases DB3, DB4, and DB5 may be installed outside the distribution equipment design support system 400 as long as they can be appropriately incorporated into the distribution equipment design support system 400 via communication or the like. ..

Regarding the specific processing contents of the plane division partition determination means 440, the upper rank ΔV extraction means 460, the multiple regression analysis means 480, and the solar radiation amount and settling value corresponding means 500, which are the main functions of the distribution equipment design support system 400. Although the details will be described separately with reference to the processing flows of FIGS. 7, 8, 9, and 17, the following is a very brief description.

First, the plane-based partitioning interval determining means 440 of FIG. 1 takes in the information of the database DB3 and takes in the dividing section (ΔIrsvr) on the plane determined by _{the active component Ir SVR} and the ineffective component Ii _{SVR of the passing current of the automatic voltage regulator SVR.} , ΔIisvr). The upper rank ΔV extraction means 460 extracts the upper rank ΔV (Irsvr, Iisvr, ΔV _{upper rank} ) from the arbitrary division sections (Δirsvr, ΔIisvr). In the multiple regression analysis means 480, multiple regression analysis using the extracted (Irsvr, Iisvr, ΔV _{upper rank} ) data set is performed for each time zone of data acquisition, and the SVR set value is obtained for each time zone. In the means 500 for associating the amount of solar radiation and the settling value, the SVR settling value for each time zone obtained by the multiple regression analysis means 480 and the amount of solar radiation for each time zone measured by the pyranometer 185 are linked and stored in the database DB5. do. After that, the SVR set value corresponding to the amount of solar radiation is output externally, and the SVR set value 350 is set for the automatic voltage adjusting device 300.

On the other hand, the control portion of the automatic voltage adjusting device 300 on the side receiving the SVR set value 350 is a sensor 170 for measuring the amount of electricity in the distribution line and a tap control device 310 for controlling the tap of the transformer as shown in FIG. It is composed of. FIG. 3 shows a transformer 305 of the automatic voltage regulator SVR according to the present invention and a specific circuit configuration example of the control portion.

The concept of tap control will be described first with reference to FIG. 3, and then the relationship between the SVR set value 350 given by the distribution equipment design support system 400 and the line voltage drop compensation circuit LDC will be described. FIG. 3 shows an autotransformer 303 and a tap changer 302, which are the main circuits of the automatic voltage regulator 300, and a tap control device 310, which is a control device.

The tap control device 310 includes a measurement unit 320, a line voltage drop compensation circuit LDC1, LDC2, a tap control unit 340, a database DB1, DB2, and a set value selection unit 345, and sets the secondary voltage of the autotransformer 303 to a predetermined value. The tap changer 302 is operated to control the voltage. The set value selection unit 345 will be described with reference to FIG. 16 described later. Here, the database DB2 holds the SVR set value 350 given by the distribution equipment design support system 400.

The databases DB1 and DB2 store various operation set values for executing tap control. These include parameters (voltage Vref, impedance R, X), dead zone Vε, timer time constant τ, operating time constant T, etc. for performing the line voltage drop compensation calculation (LDC calculation). The SVR set value 350 given to the database DB2 by the distribution equipment design support system 400 may include all of them, but at least the impedances R and X are determined by the processing in the distribution equipment design support system 400. be.

Here, the impedances R and X as the SVR set value 350 stored and used in the database DB1 are R1 and X1, and these are set by an existing method. In the present invention, the calculation method of R1 and X1. It doesn't matter. On the other hand, the impedances R and X as the SVR set value 350 stored and used in the database DB2 are R2 and X2, and the SVR set values R2 and X2 are the SVR set values given by the distribution equipment design support system 400.

The SVR set values R1 and X1 are positive values. On the other hand, the SVR set values R2 and X2 may be not only positive values but also negative values. The reason is that, depending on the relationship between the load device and the photovoltaic power generation equipment in the distribution system, the voltage at the virtual point may drop even if the SVR passing power flow becomes reverse power flow. As described above, by allowing a negative value as the value of the SVR set values R2 and X2, the effect that the voltage can be adjusted more reliably can be obtained.

A sensor CT for measuring the secondary side current Isvr of the distribution line and a sensor PT for measuring the secondary side voltage Vsvr are connected to the measuring unit 320 of the tap control device 310.

The line voltage drop compensation circuit LDC (LDC1, LDC2) detects that the secondary side voltage Vsvr measured by the measuring unit 320 deviates from a predetermined limit value, and this state continues for a predetermined measurement time or longer. By doing so, the tap switching control is executed via the tap control unit 340.

In the embodiment of FIG. 3, LDC1 and LDC2 are provided as the line voltage drop compensation circuit LDC. Of these, the line voltage drop compensation circuit LDC1 is an existing device, and the line voltage drop compensation circuit LDC2 is newly added. It is a device. Each line voltage drop compensation circuit LDC controls the voltage at the virtual point of the distribution system from the secondary side information of the automatic voltage regulator 300 within a predetermined range, but the line voltage drop compensation circuit LDC1 is a photovoltaic power generation device. While it does not have any countermeasure method for the problem in PV, the line voltage drop compensation circuit LDC2 is a countermeasure for the problem in the photovoltaic power generation device PV.

Further, with respect to the fact that the line voltage drop compensation circuit LDC includes LDC1 and LDC2, the settings of both of them may be configured so as to deal with the problem in the photovoltaic power generation device PV. When limiting the voltage within a predetermined range, the line voltage drop compensation circuits LDC1 and LDC2 can be used to determine the upper limit and the lower limit.

The present invention does not necessarily require two lines of the line voltage drop compensation circuit LDC, but when the two lines of the line voltage drop compensation circuit LDC are provided, the line voltage drop compensation circuit LDC1 is output by the solar power generation device PV. It can be said that the line voltage drop compensation circuit LDC2 is effective for tap control in fine weather, and is effective for tap control at night or in cloudy weather.

FIG. 4 shows the flow of calculation of the tap switching command 303 by the tap control unit 340. According to the flowchart of FIG. 4, in the first processing step S1, the active power Psvr and the active power Qsvr are calculated from the secondary side current Isvr and the secondary side voltage Vsvr measured by the measuring unit 320. This process may be calculated by, for example, the line voltage drop compensation circuit LDC1 of the two line voltage drop compensation circuits LDC. It should be noted that a method of directly measuring the active power Psvr and the reactive power Qsvr may be used. Further, instead of the active power Psvr and the ineffective power Qsvr, the active component Irsvr and the ineffective component Iisvr of the passing current of the automatic voltage regulator SVR may be obtained. In the following example, an example using the active ingredient Irsvr and the ineffective ingredient Iisvr will be described.

In the next processing step S2, the line voltage drop compensation circuit LDC1 reads the parameters (impedances R1 and X1 and voltage Vref1) shown in the database DB1 and executes the equation (1). By executing the equation (1) in the tap control device 310, the tap operation determination reference value Vs1 is calculated.
[Number 1]
Vs1 = Vref1 + R1 · Irsvr + X1 · Iisvr (1)
Here, the impedance (R1, X1) and the voltage Vref1 are parameters set in advance and stored in the database DB1, and Irsvr and Iisvr are the actual part of the passing current obtained from the measured passing current Isvr and the power factor cosθ. , The imaginary part of the passing current. R1 is a coefficient of the passing current of the automatic voltage regulator SVR with respect to the real part Irsvr, X1 is a coefficient of the passing current of the automatic voltage regulator SVR with respect to the imaginary part Iisvr, and Vref1 is a reference voltage.

The description of the processing step S2 in FIG. 4 describes an example of a calculation formula in which the terms of R1 and Irsvr are obtained as the product of the active power Psvr and the coefficient AP1, and the terms of X1 and Iisvr are obtained as the product of the reactive power Qsvr and the coefficient Aq1. However, this leads to the same result regardless of which method is adopted.

Similarly, in the processing step S3, the line voltage drop compensation circuit LDC2 reads the parameters (impedances R2 and X2, voltage Vref2) shown in the database DB2, and executes the equation (2). By executing the equation (2) in the tap control device 310, the tap operation determination reference value Vs2 is calculated.
[Number 2]
Vs2 = Vref2 + R2 ・ Irsvr + X2 ・ Iisvr (2)
Here, R2, X2, and Vref2 are preset parameters, and Irsvr and Iisvr are a real part of the passing current obtained from the measured passing current Isvr and the power factor cosθ, and an imaginary part of the passing current. R2 is a coefficient of the passing current of the automatic voltage regulator SVR with respect to the real part Irsvr, X2 is a coefficient of the passing current of the automatic voltage regulator SVR with respect to the imaginary part Iisvr, and Vref2 is a reference voltage.

The description of the processing step S3 in FIG. 4 describes an example of a calculation formula in which the term of R2 · Irsvr is obtained as the product of the active power Psvr and the coefficient AP2, and the term of X2 · Iisvr is obtained as the product of the reactive power Qsvr and the coefficient Ap2. However, this leads to the same result regardless of which method is adopted.

In the processing step S4, it is confirmed that the secondary side voltage Vsvr of the automatic voltage regulator SVR exceeds the predetermined positive / negative limit value ε1 with respect to the reference value Vs1 obtained by the equation (1), and is within the predetermined range. At a certain time (YES in the processing step S4), the process returns to the processing step S1 and the above processing is repeated.

When the secondary side voltage Vsvr of the automatic voltage regulator SVR exceeds a predetermined positive / negative limit value ε1 with respect to the reference value Vs1 (No in the processing step S4), the processing step S5 sets the time for satisfying the condition of the processing step S4. Accumulation is performed by a timer provided in the tap control device, a tap switching command is issued when the value exceeds Tsvr1 in the processing step S6, and Tsvr1 is reset in the processing step S7 after the tap switching.

The above processing for the result of equation (1) is similarly executed for the result of equation (2). This processing portion corresponds to the processing steps S8 to S11 of FIG.

Specifically, in the processing step S8, it is confirmed that the secondary side voltage Vsvr of the automatic voltage regulator SVR exceeds a predetermined positive / negative limit value ε2 with respect to the reference value Vs2 obtained by the equation (2). When it is within the predetermined range (YES in the processing step S8), the process returns to the processing step S1 and the above processing is repeated.

When the secondary side voltage Vsvr of the automatic voltage regulator SVR exceeds a predetermined positive / negative limit value ε2 with respect to the reference value Vs2 (No in the processing step S8), the processing step S9 sets the time for satisfying the condition of the processing step S8. It is integrated by a timer provided in the tap control device, and when the value exceeds Tsvr2 in the processing step S10, a tap switching command is issued, and after the tap switching, Tsvr2 is reset in the processing step S11.

According to the above processing judgment, when the secondary side voltage Vsvr of the automatic voltage regulator SVR is smaller than the reference value Vs1 by a constant value ε1 or more for a certain period of time (for example, Tsvr 1 second), the automatic voltage regulator SVR The tap 302 is changed in the upward direction to increase the secondary voltage. On the contrary, when a certain period of time elapses in a state where the secondary side voltage Vsvr of the automatic voltage regulator SVR is larger than this reference value Vs1 by a constant value ε1 or more, the tap 302 of the automatic voltage regulator SVR is changed in the downward direction to lower the secondary side. It operates such as lowering the voltage.

Similarly, when the secondary side voltage Vsvr of the automatic voltage regulator SVR is smaller than the reference value Vs2 by a constant value ε2 or more for a certain period of time (for example, Tsvr 2 seconds), the tap 302 of the automatic voltage regulator SVR is raised. Change the direction and raise the secondary voltage. On the contrary, when a certain period of time elapses in a state where the secondary side voltage Vsvr of the automatic voltage regulator SVR is larger than this reference value Vs2 by a constant value ε2 or more, the tap 302 of the automatic voltage regulator SVR is changed in the downward direction to lower the secondary side. It operates such as lowering the voltage.

FIG. 5 shows the relationship between the power distribution equipment design support system 400 and various measuring means 200. The active component Irsvr and the ineffective component Iisvr of the passing current of the automatic voltage regulator SVR are measured by the measuring unit 320 (see FIG. 3) in the automatic voltage regulator SVR, and from the slave station 190, the dedicated line 191 and the distribution automation. It is acquired by the distribution equipment design support system 400 via the system 600. Further, regarding the terminal voltage of the photovoltaic power generation device PV, the voltage from the voltmeter 180 is acquired from the slave station 190 to the distribution facility design support system 400 via the dedicated line 191 and the distribution automation system 600. The amount of solar radiation is also acquired from the slave station 190 to the distribution equipment design support system 400 via the dedicated line 191 and the distribution automation system 600 in the pyranometer 185 installed near the distribution system. If the pyranometer 185 is not installed, the amount of solar radiation in the area is obtained from the solar radiation measurement data from the Japan Meteorological Agency. The set value 350 is transmitted from the distribution equipment design support system 400 to the automatic voltage regulator SVR via the distribution automation system 600, the dedicated line 191 and the slave station 190.

FIG. 6 shows a configuration example when the equipment design support system 400 is configured by a computer. The facility design support system 400 includes a display device 11 that displays calculation results obtained as a result of various means, an input means 12 for receiving input from the system user, a CPU 13 for executing various means, and a communication means 14. RAM15 for holding the calculation process, data group (target distribution system, solar radiation measurement value, photovoltaic power generation device PV arrangement / capacity, load pattern, SVR arrangement), measured SVR passing current Irsvr, Iisvr Database DB3 that stores data calculated by tidal current calculation of voltage ΔVlim that contributes to suppression of photovoltaic power generation output from differential voltage ΔV, databases DB1 and DB2 that store LDC parameters, target distribution system, SVR arrangement, photovoltaic power generation equipment Database DB4 that stores the layout / capacity, load pattern, etc., and many SVR set values R2 and X2 calculated based on past results are stored together with information on the time zone and the amount of solar radiation in that time zone. It is composed of database DB5.

Next, the specific processing contents in the equipment design support system 400 will be described in order. First, the processing content of the plane-based partition interval determining means 440 will be described with reference to FIG. 7.

(Irsvr, Iisvr) In FIG. 7, which shows a flow for determining the division interval (ΔIrsvr, ΔIisvr) on the plane, in the first processing step S441, the power factors cosθ and sinθ are obtained from the measured values P and Q, or the SVR passage is valid. The current Irsvr and the reactive current Iisvr are directly measured. In the next processing step S442, the SVR passing currents Irsvr and Iisvr are calculated from the average value of the measured currents. Alternatively, the SVR passing currents Irsvr and Iisvr are obtained. By this stage, the potential difference ΔVi (i = 1, 2, ... n) between the SVR and the plurality of photovoltaic power generation output points has also been obtained, and the SVR passing currents Irsvr, Iisvr and SVR and the plurality of photovoltaic power generation outputs have been obtained. The potential difference ΔVi between the points is obtained in association with each other together with the information of the measurement time.

Further, in the processing step S443, a coordinate plane composed of Irsvr and Iisvr is assumed based on the distribution of Irsvr and Iisvr data, and this plane is divided. In the plane division, if the maximum and minimum values of Irsvr and Iisvr are about ± 100A, the plane of Irsvr and Iisvr is divided into 20 × 20 by setting ΔIrsvr = ΔIisvr = 10A as the unit of division. This makes it possible to stably perform multiple regression analysis, which is the subsequent processing. The unit of this division can be set by the user of this system.

In the plane division section determining means 440 of FIG. 7, a two-dimensional coordinate plane composed of Irsvr and Iisvr is assumed as described above, and the two-dimensional coordinate plane is divided into a plurality of sections to divide the plane. I do.

Next, the processing content of the upper rank ΔV extraction means 460 will be described with reference to FIG.

In FIG. 8 showing the processing flow of the upper rank ΔV extraction means 460, in the processing step S461, a three-dimensional space due to the SVR passing currents Irsvr and Iisvr and the potential difference ΔV between the SVR and the plurality of photovoltaic power generation output points is assumed. Specifically, in the three-dimensional coordinates (Irsvr, Iisvr, ΔV) belonging to each of the division sections (ΔIrsvr, ΔIisvr) classified by the SVR passing currents Irsvr and Iisvr, sorting is performed in descending order of the value of ΔV. In the processing step S462, among the (Irsvr, Iisvr, ΔV) data sets sorted in descending order of the ΔV value, the data having the ΔV value of the top 1, 2, and 3 is selected. The user of this system can set how many high ranks should be selected.

FIG. 13 is a diagram showing the concept of a three-dimensional space by Irsvr, Iisvr, and ΔV. In FIG. 13, the plane region is divided in units of ΔIrsvr and ΔIisvr with respect to the plane coordinates by the SVR passing currents Irsvr and Iisvr, and the potential difference ΔV between the SVR and the plurality of photovoltaic power generation output points in the height direction. Is assumed to be a three-dimensional space that adopts. The potential difference ΔV in the divided plane is indicated by ○ or ●, but here, the higher rank one having a large potential difference ΔV is indicated by ●.

In FIG. 8, a selection flag is added to the data set in which the value of the potential difference ΔV is in the top 1, 2, and 3 (Irsvr, Iisvr, ΔV). Depending on whether or not the selection flag is set, it is possible to discriminate the data when performing the multiple regression analysis, and the processing of the multiple regression analysis means 480 shown in FIG. 9 is started.

FIG. 9 shows the processing of the multiple regression analysis means 480. First, in the processing step S900, the unit time for performing the multiple regression analysis is set. For example, 1 hour or 3 hours. In the processing step S907, for example, the calculation for all the time zones in 1-hour or 3-hour increments for the daytime of the day is completed. Subsequent processing is performed on the data set included in the unit time. In the processing step S901, the combination of the photovoltaic power generation device PVi is searched, and in the processing step S902, the combination of the photovoltaic power generation device PVi having the selection flag == 1 is extracted. After finding the combination of the photovoltaic power generation device PVi in which the selection flag == 1, in the processing step S903, the potential difference ΔV at that time and the SVR passing currents Irsvr and Iisvr are subjected to multiple regression analysis calculation, and ΔV = α ×. Let α such that Irsvr + β × Iisvr + ΔV0 be the set value R (Ω) of LDC2 of SVR.

Further, in the processing step S904, a multiple regression analysis is performed between the potential difference ΔV and the SVR passing current Iisvr at this time, and β such that ΔV = α × Irsvr + β × Iisvr + ΔV0 is set to the set value X (Ω) of the LDC2 of the automatic voltage regulator SVR. ).

In the processing step S905, the difference ΔV between the SVR secondary side voltage and the Pvi end voltage at which the selection flag == 1 and the SVR passing current Iisvr data are calculated by multiple regression analysis, and the SVR set value is set from the intercept with the Z axis. Calculate ΔV0.

In the processing step S906, if all the data combination patterns have not been searched, the process returns to the processing step S901. If all the data combination patterns have been searched, this process is terminated and the SVR set values R2 and X2 associated with the season / time zone are determined.

By the above processing performed for each set time zone, for example, the SVR set values R2 and X2 obtained in the hourly time zone from 6:00 am to 6:00 pm when there is sunshine are obtained. The SVR settling values R2 and X2 for each of these time zones are stored in the database DB5 shown in FIG. 1 together with the time information. The SVR set value for each time zone obtained by the multiple regression analysis means 480 is stored in the database DB 5 in association with the amount of solar radiation for each time zone measured by the pyranometer 185.

In the process of FIG. 9, in short, in determining the virtual points defined by the set values R and X of the LDC2 of the automatic voltage regulator SVR, the positions are determined in consideration of the photovoltaic power generation device PV that causes output suppression. For example, if there are 100 photovoltaic power generation device PVs under the control of the automatic voltage regulator SVR, and 50 of them are photovoltaic power generation device PVs that frequently or cause large-scale output suppression, all 100 units are used. In contrast to the conventional one in which the virtual point is set in consideration of the above, in the present invention, the virtual point is set mainly by 50 photovoltaic power generation devices PV that cause output suppression.

Therefore, some methods for realizing the virtual point setting mainly for the photovoltaic power generation device PV that causes output suppression can be assumed, and the present invention may be any of them. For example, these transformation methods are limited to the PV of the photovoltaic power generation device having a high degree of output suppression, or are determined by iterative calculation so as to increase the number of PV of the photovoltaic power generation device that can be saved from the output suppression as much as possible. It is conceivable that the weight coefficient of the PV of the photovoltaic power generation device that causes output suppression is increased to determine the virtual point.

FIG. 10 shows the geometric images of α and β obtained in FIG. FIG. 10 shows a three-dimensional plane determined by the active component Irsvr and the ineffective component Iisvr of the SVR passing current, and the potential difference ΔV between the SVR secondary side voltage and the terminal voltage of the photovoltaic power generation device. Here, when the potential difference ΔV is ΔV0, the region represented by the voltage fluctuation amount ΔΔV when the active ingredient Irsvr increases and the voltage fluctuation amount ΔΔV'when the invalid component Ii increases is displayed.

From this relationship in FIG. 10, α and β can be expressed by equations (3) and (4). These coefficients α and β are nothing but the determination of the SVR set values R2 and X2 associated with the season / time zone.
[Equation 3]
α = ΔΔV / ΔIr (3)
[Equation 4]
β = ΔΔV'/ ΔIi (4)
In the embodiment of FIG. 1, an example in which the automatic voltage regulator SVR and the distribution equipment design support system 400 are separately arranged to perform signal transmission is shown, but FIG. 11 shows an SVR set value determining means in the automatic voltage regulator SVR. An embodiment provided with 400A is shown. The SVR settling value determining means 400A has a database DB3A, a plane division interval determining means 440A, a higher rank ΔV extracting means 460A, a multiple regression analysis means 480A, a means for associating the amount of solar radiation with the settling value 500A, a database DB4A, and a database DB5A. .. The measuring means 200 acquires the SVR passing currents Irsvr and Iisvr, the potential difference ΔVi between the automatic voltage regulator SVR and the PVi output point of the photovoltaic power generation device, and the amount of solar radiation, and the plane division section determining means 440A and the upper rank ΔV extracting means 460A. After selecting the data having a correlation with the output suppression of the photovoltaic power generation device, the SVR set value for each time zone is obtained by the means of 480A for performing the multiple regression analysis. In addition, the SVR settling value for each time zone is stored and stored in the database DB5A in association with the information on the amount of solar radiation by the means for associating the amount of solar radiation with the settling value 500A. After that, the SVR set value 350 indicates that the tap control 310 is set.

The concept of processing described with reference to FIGS. 1 and 11 will be described with reference to FIGS. 12a and 12b. First, FIG. 12a shows an example of a surface area configuration of a distribution system extending from a substation 110 via an automatic voltage regulator SVR, for example, in a dendritic shape. In the power distribution system, the photovoltaic power generation device PV is arranged at the position of “◯”. Here, it is assumed that the position of the virtual point on the secondary side of the automatic voltage regulator SVR defined by the operation setting values R1 and X1 of the line voltage drop compensation circuit LDC1 which is an existing device is G1. The virtual point corresponds to the position of the center of gravity of the impedance distribution in the area configuration of the distribution system. Therefore, if this point is voltage-controlled, it is possible to properly voltage-control the entire distribution system.

On the other hand, FIG. 12b has a correlation with the output suppression in the photovoltaic power generation device PV obtained by the plane division section determining means 440A, the upper rank ΔV extraction means 460A, and the multiple regression analysis means 480A in FIGS. 1 and 11. Only the PV of the photovoltaic power generation device is indicated by “●”. In the multiple regression analysis means 480, the output suppression is particularly large in consideration of the arrangement information of the photovoltaic power generation device PV having a correlation with the extracted output suppression, and the potential difference between the SVR secondary side voltage and the PVi terminal voltage of the photovoltaic power generation device For the photovoltaic power generation device PVi having a large correlation with ΔVi, the position G2 of the center of gravity of the impedance distribution in the area configuration of the distribution system is obtained.

FIG. 14 is a diagram showing a plane obtained by the multiple regression analysis means 480A using the data group of ● extracted by the plane division interval determination means 440A and the upper rank ΔV extraction means 460A. This plane is a plane obtained from the set of ●, and as a result of determining the coefficients α and β shown in FIG. 10 from this plane, the output suppression is particularly large, and the potential difference between the SVR secondary side voltage and the PVi terminal voltage of the photovoltaic power generation device is large. An automatic voltage regulator SVR can be configured in consideration of the photovoltaic power generation device PVi having a large correlation with ΔVi.

Further, FIG. 15 shows the relationship between the estimation accuracy of the potential difference ΔV in the cases of FIGS. 12a and 12b. In the upper part of FIG. 15, the time change of the potential difference (thin solid line) at the time of the conventional method (multiple regression analysis based on all data) of FIG. 12a and the time change of the potential difference estimated by the conventional method (thick solid line) are displayed in comparison. There is. If the thick solid line overlaps with the thin solid line, it means that the potential difference was estimated accurately, indicating that the control by the automatic voltage regulator SVR is performed well, but especially about the maximum value. It is clear that the estimation is not good.

Here, since the maximum value is the region where there is a high possibility that photovoltaic power generation output suppression will be implemented, the thick solid line should accurately estimate the vicinity of the maximum value of the thin solid line, but the maximum value could be estimated accurately. The lack of it is a conventional problem. Regarding this point, according to the method according to the proposal of the present invention shown in the lower part of FIG. 15, the thick solid line can accurately estimate the vicinity of the maximum value of the thin solid line, and there is a possibility that the photovoltaic power generation output suppression will be implemented. Can be understood to be low.

FIG. 17 shows the processing content of the means 500 for associating the amount of solar radiation with the settling value. In the processing of the means 500 for associating the amount of solar radiation with the settling value, first, in the processing step S1701, the amount of solar radiation for each unit time in the corresponding area is acquired. The amount of solar radiation may be data published to the meteorological agencies such as the Japan Meteorological Agency and NEDO. Next, in the processing step S1702, the settling value for each unit time calculated in the multiple regression analysis processing 480 in the previous stage is acquired. After that, in the processing step S1703, a correlation between the amount of solar radiation and the settling value is generated for each unit time. As the processing of the processing step S1703, a linear form is generated by a method of associating the amount of solar radiation for each unit time with the settling value and creating a table, or a multiple regression analysis based on a set of data of the amount of solar radiation and the settling value for each unit time. There is also a method. The amount of solar radiation and the settling value correlated for each unit time are accumulated in the database DB5.

FIG. 16 shows the processing contents of the set value selection unit 345 in SVR. When the SVR receives the amount of solar radiation from the pyranometer 185 in the processing step S1601 of FIG. 16, the SVR refers to the database DB5 and selects a set value corresponding to the amount of solar radiation. In the process step S1602, the selected settling value is transmitted to the LDC2.

In the process of FIG. 16, it is conceivable to refer to the database DB5 and handle the amount of solar radiation reflected in the setting of LDC2 (hereinafter referred to as the reference solar radiation amount) as follows. First, the reference amount of solar radiation should be grasped as, for example, the average amount of solar radiation in a time zone of one hour. As a result, it is possible to avoid a situation in which the SVR setting value is variably changed each time due to a momentary change in the amount of solar radiation and the control is not stabilized.

Further, the reference solar radiation amount may be based on the weather forecast. For example, when tomorrow's weather is cloudy (or clear) and the weather in the season is cloudy (or clear), many past records have been obtained, and it has been found that the estimated reliability of tomorrow's weather forecast is high. When doing so, the amount of solar radiation in the past record can be used as the reference information of the amount of solar radiation tomorrow as the reference amount of solar radiation when referring to the database DB5.

Further, the reference solar radiation amount may be a predicted solar radiation amount obtained by predicting the weather at a future time. When the current time is 10 o'clock from the movement of clouds in the neighboring area, the weather forecast, etc., the weather at 11 o'clock one hour later is predicted, and the amount of solar radiation at that time is used as the reference amount of solar radiation when referring to the database DB5. Can be used. The prediction time point is not limited to one hour later, and may be set arbitrarily.

As the reference solar radiation amount, not only the measured actual solar radiation amount but also a value determined from the above viewpoint can be used. In the present invention, these are collectively referred to as the reference solar radiation amount.

In FIG. 16, when referring to the database DB5 using the reference insolation amount and extracting the settling value, it is conceivable that there is not necessarily one that exactly matches the conditions. In this case, selection under similar conditions is selected. Good to do. For this purpose, an appropriate learning process or the like may be adopted.

The operation setting values R2 and X2 of the line voltage drop compensation circuit LDC2 of the present invention indicate the center of gravity position G2. According to the present invention, by setting a position closer to the photovoltaic power generation device to be output suppressed as a virtual point, tap control in the automatic voltage regulator SVR is distributed so that the voltage in the vicinity does not deviate from the limit value. Since the voltage of the system is adjusted, the photovoltaic power generation equipment, which has many opportunities to suppress the output, will be placed in a favorable environment without being suppressed.

In the conventional case, the output status of the photovoltaic power generation device PV is not considered only by controlling the center of gravity position G1 once determined, but in the present invention, the photovoltaic power generation device PV having a correlation in descending order of output suppression. Since only the solar power generation device PV is extracted and reflected as the center of gravity position G2 each time, it is possible to avoid the unfairness of the specific photovoltaic power generation device PV suffering from the loss of power sales opportunity due to the output suppression.

As a result, even if the output of the PV of the photovoltaic power generation device rises excessively, the tap control in the automatic voltage regulator SVR on the upstream side adjusts the voltage of the distribution system in advance, so that the voltage of the PV of the photovoltaic power generation device is adjusted. It is possible to reduce the chances of output suppression.

By the above control according to the present invention, there is an effect that the amount of suppression of the output of photovoltaic power generation can be reduced even in a system in which a large amount of photovoltaic power generation is introduced into a branch system or the like. In addition, by adjusting the voltage of the system only when the voltage adjustment device suppresses the output of photovoltaic power generation, it is possible to improve the voltage adjustment capacity of the voltage adjustment device at all times, and the load that can be connected to the distribution system Countermeasures against an increase in the amount of solar power generation This has the effect of reducing equipment costs.

Further, according to the present invention, even within the same daylight hours, the state of the power system changes due to the difference in sunshine conditions, so the set value to be set depends on the amount of solar radiation. By making it variable, it is possible to contribute to more detailed power system control.

The present invention described above has various embodiments, but in any case, "the impedance of the distribution system in the predetermined time zone is obtained based on the information obtained from the distribution system within the predetermined time zone. Refer to the impedance derivation means for each time zone, the solar radiation amount acquisition means for obtaining the solar radiation amount in the predetermined time zone, the database that stores the impedance and the solar radiation amount in the same predetermined time zone in association with each other, and the database by the reference solar radiation amount. The impedance extraction means for obtaining the impedance at the reference solar radiation amount and the tap are adjusted so that the voltage at the virtual point of the distribution system is set as the set voltage by using the extracted impedance as a set value. "

Here, the impedance derivation means for each time zone is a part mainly composed of the plane division section determination means 440, the upper rank ΔV extraction means 460, and the multiple regression analysis means 480 in FIG. 1, and the solar radiation amount acquisition means is shown in FIG. It is a part measured by the pyranometer 185 of 4 or obtained from the measuring means 200 of FIG. 1, the database is the database DB 5 of FIG. 1, and the impedance extraction means is the set value selection unit 345 of FIG. The processing parts in the 16 flows correspond to each other.

It can be used as a voltage regulator that adjusts the voltage of the distribution system. It can also be used as a control system for an automatic voltage regulator SVR, which is a voltage regulator, and a distribution substation LRT. In addition, in the distribution system, it can be used as a voltage maintenance measure and a power distribution facility capacity factor improvement measure corresponding to the expansion of distributed power sources such as solar power generation.

100: Distribution system 110: Distribution substation 120: Node PV: Solar power generation device 140: Distribution line 150: Load 170: Sensor 300: Automatic voltage regulator 302: Tap changer 303: Autotransformer 305: Transformer 310 : Tap control device CT: Current sensor PT: Voltage sensor 320: Control device measurement unit LDC1, LDC2: Line voltage drop compensation circuit 340: Tap control device DB1, DB2, DB3, DB4, DB5: Database

Claims (15)

It is a voltage regulator of a distribution system equipped with a transformer with a tap that is installed in a distribution system equipped with multiple photovoltaic power generation devices and adjusts the tap to set the voltage at the virtual point of the distribution system as the set voltage.
Based on the information obtained from the distribution system within the predetermined time zone, the impedance derivation means for each time zone for obtaining the impedance which is the set value of the voltage regulator, which is uniquely determined for the distribution system in the predetermined time zone, and the predetermined impedance The means for obtaining the amount of solar radiation in a time zone, a database for storing the impedance and the amount of solar radiation in the same predetermined time zone in association with each other, and the above-mentioned for the reference solar radiation amount by referring to the database according to the reference solar radiation amount. A voltage adjusting device for a distribution system, which comprises an impedance extracting means for obtaining impedance and a tap adjusting means for adjusting a tap so that the voltage at a virtual point of the distribution system is set as a set voltage by using the extracted impedance as a set value. .. The voltage adjusting device for the distribution system according to claim 1.
The information obtained from the distribution system is an active component and an ineffective component of the passing current of the tapped transformer, and a potential difference between the tapped transformer and the plurality of photovoltaic power generation devices.
The time zone impedance derivation means determines the division section on the plane determined by the active component and the ineffective component of the passing current of the tapped transformer, and the potential difference in the division section. Multiple regression analysis is performed to determine the impedance of the tapped transformer by performing multiple regression analysis using the upper rank potential difference extraction means that ranks in descending order of potential difference and extracts a plurality of upper potential differences and the extracted potential differences. A voltage regulator for a distribution system, characterized in that it is equipped with means. The voltage adjusting device for the distribution system according to claim 2.
The voltage regulator obtains information from the measuring means for the passing current of the tapped transformer, the potential difference between the tapped transformer and the installation point of the solar power generation device, and the amount of solar radiation, and the measuring means is used. It is provided with storage means including information, information on the configuration of the target distribution system, information on the arrangement / capacity of the solar power generation device, information on the load pattern, and information on the arrangement data of the tapped transformer. A voltage regulator for the distribution system, which is characterized by this. The voltage adjusting device for the distribution system according to claim 2 or 3.
A voltage regulator for a distribution system, wherein a set value representing a distance from the tapped transformer to the virtual point is an impedance during this period or a coefficient related to the impedance. The voltage adjusting device for a power distribution system according to any one of claims 2 to 4.
At least two sets of line voltage drop compensation circuits are provided, and the first line voltage drop compensation circuit adjusts the tap of the tapped transformer so that the voltage at the first virtual point in the distribution system is set as the set voltage. The line voltage drop compensation circuit of 2 adjusts the tap of the tapped transformer so that the voltage at the second virtual point in the distribution system is set as the set voltage by using the set value obtained by the impedance extraction means. A voltage regulator for a distribution system characterized by. The voltage adjusting device for a power distribution system according to any one of claims 1 to 5.
The reference solar radiation amount is any one of the measured solar radiation amount, the solar radiation amount determined based on the past results, and the solar radiation amount determined based on the weather forecast. A transformer with a tap that is applied to a distribution system equipped with multiple photovoltaic power generation devices and adjusts the tap to set the voltage at the virtual point of the distribution system as the set voltage, and voltage adjustment of the distribution system including the distribution equipment design support system. It ’s a system,
The power distribution equipment design support system
Based on the information obtained from the distribution system within the predetermined time zone, the impedance derivation means for each time zone for obtaining the impedance which is the set value of the voltage regulator, which is uniquely determined for the distribution system in the predetermined time zone, and the predetermined time zone A means for obtaining the amount of solar radiation in a time zone and a database for storing the impedance and the amount of solar radiation in the same predetermined time zone in association with each other are provided.
The tapped transformer sets an impedance extraction means for obtaining the impedance at the reference solar radiation amount by referring to the database based on the reference solar radiation amount, and a voltage at a virtual point of the distribution system using the extracted impedance as a set value. A voltage adjustment system for a power distribution system, which is provided with a tap adjustment means for adjusting a tap to obtain a voltage. The voltage adjusting system for the distribution system according to claim 7.
The power distribution equipment design support system obtains information from measuring means for the passing current of the tapped transformer, the potential difference between the tapped transformer and the installation point of the solar power generation device, and the amount of solar radiation, and measures the measurement. A storage means including information from the means, information on the configuration of the target distribution system, information on the arrangement / capacity of the solar power generation device, information on the load pattern, and information on the arrangement data of the tapped transformer. A voltage adjustment system for the distribution system, which is characterized by being equipped. It is a voltage adjustment method for a distribution system equipped with a transformer with a tap that is installed in a distribution system equipped with multiple photovoltaic power generation devices and adjusts the tap to set the voltage at the virtual point of the distribution system as the set voltage.
Based on the information obtained from the distribution system within the predetermined time zone, the impedance, which is the set value of the voltage regulator, which is uniquely determined for the distribution system in the predetermined time zone, is obtained, and the amount of solar radiation in the predetermined time zone is obtained. , The impedance and the amount of solar radiation in the same predetermined time zone are stored in association with each other, the impedance and the amount of solar radiation stored in association with each other are referred to, the impedance at the time of the reference solar radiation amount is extracted, and the extracted impedance is set. A voltage adjustment method for a distribution system, characterized in that the tap is adjusted so that the voltage at a virtual point of the distribution system is used as a value as a set voltage. It is applied to a distribution system equipped with a plurality of photovoltaic power generation devices and a transformer with a tap that adjusts a tap so that the voltage at a virtual point of the distribution system is set to a set voltage according to a given set value. It is a distribution equipment design support system for distribution systems that gives a set value for estimating voltage.
As information obtained from the distribution system within a predetermined time zone, based on the active component and the ineffective component of the passing current of the tapped transformer, and the potential difference between the tapped transformer and the plurality of solar power generation devices. A time zone-specific impedance deriving means for obtaining an impedance, which is a set value of a voltage regulator, which is unique to the power distribution system in the predetermined time zone, and a solar power output obtaining means for obtaining a solar power output in the predetermined time zone. A power distribution is provided with a database for storing the impedance and the solar power output in the same predetermined time zone in association with each other, and an output means for applying the voltage extracted from the database to the tapped transformer. System distribution equipment design support system. The distribution equipment design support system for the distribution system according to claim 10.
Information is obtained from the measuring means for the passing current of the tapped transformer, the potential difference between the tapped transformer and the installation point of the photovoltaic power generation device, and the amount of solar radiation, and the information from the measuring means and the target. It is characterized by having a storage means including information on the configuration of the distribution system to be used, information on the arrangement / capacity of the photovoltaic power generation device, information on the load pattern, and information on the arrangement data of the tapped transformer. Distribution equipment design support system for distribution systems. The voltage adjusting device for a power distribution system according to any one of claims 1 to 6.
A voltage regulator for a distribution system, characterized in that the impedance used as a set value is a positive value and a negative value. The voltage adjusting system for the distribution system according to claim 7 or 8.
A voltage adjustment system for a distribution system, characterized in that the impedance used as a set value is a positive value and a negative value. The voltage adjusting method for a distribution system according to claim 9.
A voltage adjusting method for a distribution system, wherein the impedance used as a set value is a positive value and a negative value. The distribution equipment design support system for the distribution system according to claim 10 or 11.
A distribution equipment design support system for a distribution system, characterized in that the impedance used as a set value is a positive value and a negative value.

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