JP2019193531A - Distribution system voltage regulator, voltage regulation system, voltage regulation method, and distribution facility design support system - Google Patents

Abstract

To reduce the output suppression of a solar power generation device for avoiding the phenomenon in which the voltage at an installation point of a solar power generation device rises, such that the opportunity for selling power by consumers is not lost.SOLUTION: A distribution system voltage regulator includes an impedance deriving unit for each time zone, which obtains an impedance that is a set value of a voltage regulator, which is uniquely determined for a power distribution system in a predetermined time zone, on the basis of information obtained from the power distribution system within the predetermined time zone, a solar radiation amount obtaining unit that obtains a solar radiation amount in the predetermined time zone, a database that stores the impedance and the solar radiation amount in the same predetermined time period in association with each other, an impedance extraction unit that obtains the impedance at the time of the standard solar radiation amount by referring to the database by the standard solar radiation amount, and a tap adjusting unit that adjusts the tap value such that the voltage at the virtual point of the distribution system is set to the set voltage by using the extracted impedance as a set value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a voltage adjustment device, a voltage adjustment system, a voltage adjustment method, and a distribution facility design support system for a distribution system, and more particularly, solar power generation when the output of a solar power generation device installed in the distribution system is suppressed. The present invention is suitable for application to a voltage adjustment device, a voltage adjustment system, a voltage adjustment method, and a distribution facility design support system for a distribution system that enables control to reduce the voltage at the device installation point.

  In recent power distribution systems, the grid connection of solar power generators is increasing, but in the power distribution system, there is a phenomenon that the voltage at the solar power generator installation point increases as the amount of power generated by the solar power generators increases. . In order to avoid this, the photovoltaic power generation apparatus is provided with a function of suppressing the power generation amount of the photovoltaic power generation apparatus when the self-terminal voltage rises above the specified voltage. This function limits the amount of power generated by the solar power generation device.

  On the other hand, the voltage of the power distribution system can be selected from the tap switching of a transformer (load ratio control transformer LRT: Load Ratio Control Transformer) installed in a distribution substation or an automatic voltage regulator (SVR) installed on the distribution line. It is controlled by tap switching such as Step Voltage Regulator.

  In order to avoid the suppression of the power generation amount in the solar power generation apparatus described above, the voltage of the power distribution system is adjusted by the voltage adjustment device (load switching transformer LRT or SVR) to avoid the output suppression. Is important. For this purpose, it is necessary to appropriately perform tap control according to the amount of power generated by the solar power generation device.

  The following methods are known as control methods for the voltage regulator. For example, in a normal automatic voltage regulator (hereinafter referred to as “SVR”), a method is known in which a tap value is determined from a secondary side voltage at the end, a passing current, and a power factor (see Non-Patent Document 1). .

  On the other hand, Patent Document 1 discloses a voltage fluctuation obtained by adding a voltage increase width from a voltage output from a voltage adjustment transformer to a voltage at the highest voltage point and a voltage decrease width from a voltage sent from the transformer to a voltage at the lowest voltage point. A control method for selecting a transmission voltage of the voltage regulator so that the center value of the range becomes a specified value is shown.

  The secondary voltage (tap value) of the SVR is adjusted according to the amount of power generated by the photovoltaic power generator in the system, and the amount of power generated by the photovoltaic power generator at that time is determined by communication between the photovoltaic power generator and the SVR. It is known to infer from solar radiation information. The detailed configuration of the SVR is also described in detail in Non-Patent Document 1. A specific calculation method for multiple regression analysis is also known.

JP 2009-240038 A

"Progress and application of line voltage regulators" Modern distribution technology, Denki Sho 128-134 (1972)

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

  Moreover, in the method of patent document 1, in the situation where the voltage rise is avoided by the output suppression of a solar power generation device, the line voltage drop compensator of a voltage regulator cannot be appropriately set, There is a problem that the suppression of the output of photovoltaic power generation cannot be avoided. In particular, with the expansion of the so-called mega solar power distribution system to the end of the power distribution system and the low voltage side to the general consumer solar power generation system, the terminal voltage of the solar power generation system increases, As a result, the output of the solar power generation device is suppressed, and there is a problem that the loss of power selling opportunities by the specific consumer occurs, resulting in lack of fairness.

  Furthermore, when trying to predict the voltage rise at the PV end using all the measured values of the distribution system, a combination of the power factor of the load of the distribution system and the power factor of the photovoltaic power generation device, or the distribution of the load and the photovoltaic power generation device Depending on the distribution on the grid, the estimation accuracy of the voltage increase at the end of the photovoltaic power generation device is lowered, and the SVR becomes inoperative.

  Furthermore, since the amount of power generated by the photovoltaic power generation device varies depending on the change in solar radiation and the setting parameters (power factor, etc.) for each photovoltaic power generation device, the prediction accuracy of the voltage at the end of the photovoltaic power generation device decreases. There is a concern that the SVR operates wastefully (hunting operation).

  The present invention has been made in consideration of the above points, and reduces the suppression of the output of the solar power generation device for avoiding the phenomenon that the voltage at the installation point of the solar power generation device rises, and the opportunity of selling power by the consumer It is an object of the present invention to propose a voltage adjustment device, a voltage adjustment system, a voltage adjustment method, and a distribution facility design support system for a distribution system that can prevent loss of power.

  In order to solve this problem, in the present invention, a transformer with a tap that is installed in a distribution system including a plurality of photovoltaic power generation devices and adjusts a tap value so that a voltage at a virtual point of the distribution system is set as a set voltage. A voltage regulation device for a distribution system comprising: a settling value of the voltage regulation device that is uniquely determined for the power distribution system in the predetermined time zone based on information obtained from the power distribution system within a predetermined time zone. An impedance deriving unit for each time zone for obtaining a certain impedance; a solar radiation amount obtaining unit for obtaining a solar radiation amount in the predetermined time zone; a database for storing the impedance and the solar radiation amount in the same predetermined time zone in association with each other; An impedance extraction unit for obtaining the impedance at the reference solar radiation amount with reference to the database based on the amount; and A tap adjustment unit that adjusts the tap value so that the voltage at the virtual point of the power distribution system is set to the set voltage using the output impedance as a set value, and hunting operation when the hunting determination is true by a predetermined hunting operation condition determination formula And a hunting operation determination unit that corrects the set value to avoid the above.

  Further, in the present invention, a distribution system including a transformer with a tap that is installed in a distribution system including a plurality of photovoltaic power generation devices and adjusts a tap value so as to set a voltage at a virtual point of the distribution system as a set voltage. A voltage adjustment system for a distribution system including a voltage adjustment device and a distribution facility design support system, the distribution facility design support system based on information obtained from the distribution system within a predetermined time period. An impedance deriving unit for each time zone that determines an impedance that is a set value of the voltage regulator, which is uniquely determined for the power distribution system in a time zone, and a solar radiation amount obtaining unit that calculates the solar radiation amount in the predetermined time zone, the same predetermined A database for storing the impedance and the amount of solar radiation in association with each other in a time zone, and the transformer with a tap is arranged based on a reference amount of solar radiation. An impedance extraction unit that extracts the impedance at the reference solar radiation amount with reference to a database, and adjusts the tap value so that the voltage at the virtual point of the distribution system is set as a set voltage using the extracted impedance as a set value And a hunting operation determination unit that corrects to a set value that avoids the hunting operation when the hunting determination is true based on a predetermined hunting operation condition determination formula.

  Further, in the present invention, a distribution system including a transformer with a tap that is installed in a distribution system including a plurality of photovoltaic power generation devices and adjusts a tap value so as to set a voltage at a virtual point of the distribution system as a set voltage. A voltage adjustment method, wherein the voltage adjustment device is a set value of the voltage adjustment device that is uniquely determined for the power distribution system in the predetermined time zone based on information obtained from the power distribution system within a predetermined time zone. A storage step of obtaining an impedance and obtaining an amount of solar radiation in the predetermined time zone, and storing the impedance and the amount of solar radiation in the same predetermined time zone in association with each other, and the voltage adjusting device includes the impedance stored in association with the impedance Refer to the solar radiation amount, extract the impedance at the standard solar radiation amount, and use the extracted impedance as a settling value And having a an adjustment step of adjusting the tap value so as to the set voltage of the voltage at the virtual point of conductive lines.

  Further, in the present invention, a voltage regulator including a plurality of photovoltaic power generators and a transformer with a tap for adjusting a tap value so that a voltage at a virtual point of the distribution system is set to a set voltage according to a given set value And a distribution facility design support system for a distribution system that provides a settling value for estimating the voltage at the virtual point, the information obtained from the distribution system within a predetermined time zone. Based on the effective and ineffective components of the passing current of the transformer with taps, and the potential difference between the transformer with taps and the plurality of photovoltaic power generation devices, inherent to the distribution system in the predetermined time zone An impedance deriving unit for each time zone for obtaining an impedance that is a set value of the voltage regulator, and a photovoltaic power output for obtaining a photovoltaic power output in the predetermined time zone A database for associating and storing the impedance and the photovoltaic power generation output in the same predetermined time zone, an output unit for supplying the impedance extracted from the database to the transformer with a tap, and a predetermined hunting operation condition determination And a hunting operation determination unit that corrects the set value to avoid the hunting operation when the hunting determination is true according to the equation.

  According to the present invention, it is possible to reduce the output suppression of the solar power generation device for avoiding the phenomenon that the voltage at the installation point of the solar power generation device increases, and to prevent the loss of the opportunity to sell power by the consumer. it can.

It is explanatory drawing which shows the structural example of a general power distribution system and a voltage adjustment system. It is a figure which shows the whole structure of the power distribution equipment design support system which concerns on this Embodiment. It is a figure which shows the structure of the tap control apparatus of an automatic voltage regulator. It is a processing flow figure which avoids photovoltaic power generation output suppression by tap control operation. It is a figure which shows the data flow of a measurement part and a power distribution equipment design support system. It is a figure which shows the structure in the case of comprising an equipment design support system with a computer. It is a flowchart which shows the processing content of the division | segmentation area determination part on a plane in an equipment design support system. It is a flowchart which shows the processing content of the high rank (DELTA) V extraction part in an equipment design support system. It is a flowchart which shows the processing content of the multiple regression analysis part in an equipment design support system. It is a figure which shows the geometrical image of (alpha) and (beta) obtained in FIG. It is a figure which shows the Example provided with the set value determination part in the automatic voltage regulator. It is a figure which shows only the surface area structural example of the distribution system extended | stretched and arranged by the dendritic shape via the automatic voltage regulator, and only the solar power generation device PV which has a correlation with the output suppression in the solar power generation device PV. . It is a figure which shows the concept of the three-dimensional space by Irsvr, Iisvr, and (DELTA) V. It is a figure which shows the positional relationship of the plane obtained by the multiple regression analysis part by the extracted data. It is a figure which shows the relationship between the effect of the proposal system in the past and this Embodiment. It is a flowchart which shows an example of the corresponding | compatible process of a solar radiation amount and a set value. It is a flowchart which shows an example of a setting value selection process. It is a flowchart which shows an example of the set value correction process for avoiding a hunting operation | movement. It is a block diagram which shows the example of whole structure of the distribution equipment design support system for determining the set value with respect to LRT. It is a block diagram which shows an example of the relationship between LRT and a power distribution equipment design support system. It is a block diagram which shows the structural example at the time of setting this Embodiment as a remote settling method. It is a figure which shows an example of a set value space and an image of a set value function.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
(1) System configuration according to the present embodiment FIG. 1 is a diagram illustrating a configuration example in which the voltage regulation system according to the present embodiment is applied to a power distribution system 100.

  The illustrated distribution system 100 includes a node (bus) 120, a distribution line 140 connecting them, a load 150 connected to the node 120, a photovoltaic power generation device PV, a sensor 170 installed in the distribution line 140, and a distribution substation. 110 or the like. Here, the left side of the distribution substation 110 in the figure is the feeder sending side, and the right side is the feeder end side.

  The automatic voltage regulator 300 is a voltage regulator that is installed in series with the line 140 and adjusts the line voltage. Examples of the automatic voltage regulator 300 include an on-load tap switching transformer LRT and an automatic voltage regulator SVR. Here, an example in which an SVR is arranged as the voltage regulator 300 is shown.

  The automatic voltage regulator 300 may be provided with a load ratio control transformer (LRT) at the distribution substation. As shown in the figure, the automatic voltage regulator 300 includes a transformer 305 composed of a single transformer and a tap changer, a sensor 170 and a tap controller 310 installed in a distribution line, and signals from the sensor 170 and distribution The secondary voltage (hereinafter referred to as “tap value”) of the SVR is operated using the operation set value 350 from the facility design support system 400.

  The power distribution facility design support system 400 appropriately receives inputs from various measuring units 200 including the sensor 170 and gives the operation voltage setting value 350 to the automatic voltage regulator 300. Although FIG. 1 shows a simplified distribution system, in practice, automatic voltage regulators 300 are appropriately provided at various locations in a plurality of feeders. An optimum operation set value 350 at each installation location is determined and given to the voltage adjustment device 300.

  The voltage adjustment system according to the present embodiment includes an automatic voltage adjustment device 300 and a distribution facility design support system 400 as an overall configuration, but in this embodiment, instead of the automatic voltage adjustment device 300 itself, 2 may include a function of the distribution facility design support system 400 exemplified in 2 and integrated as a voltage regulator.

  FIG. 2 shows the overall configuration of the distribution facility design support system according to the present embodiment. For the internal processing, the power distribution facility design support system 400 receives the active component Irsvr and reactive component Iisvr (or active power Psvr and reactive power Qsvr), SVR of the passing current of SVR from various measuring units 200 including the sensor 170. The potential difference ΔV between the installation point of the solar power generation device and the installation point of the photovoltaic power generation device PV, the amount of solar radiation, and the like are acquired.

  The distribution facility design support system 400 is generally configured as a computer system, and is divided into an upper plane divided section determination unit 440, an upper rank ΔV extraction unit 460, a multiple regression analysis unit 480, a solar radiation amount and settling value association unit 500, A database DB3, a database DB4, a database DB5, and the like are provided.

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

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

  The databases DB3, DB4, and DB5 may be installed outside the power distribution facility design support system 400 as long as they can be appropriately taken into the power distribution facility design support system 400 through communication or the like. Good.

  On the other hand, the settling values R1 and X1 are positive values. On the other hand, the settling values R2 and X2 may be not only positive values but also negative values. This is because the voltage at the virtual point may drop even when the SVR passing power flow is a reverse power flow depending on the relationship between the arrangement of the load device and the photovoltaic power generation facility in the distribution system. As described above, by allowing negative values as the values of the settling values R2 and X2, voltage adjustment can be performed more reliably.

  Specific processing contents of the on-plane divided section determination unit 440, the upper rank ΔV extraction unit 460, the multiple regression analysis unit 480, and the solar radiation amount / settling value association unit 500, which are the main functions of the distribution facility design support system 400 This will be described in detail with reference to the processing flows of FIGS. 7, 8, 9 and 16 separately. The following is a brief description.

  First, the divided section determination unit 440 on the plane takes in the information of the database DB3 and determines divided sections (ΔIrsvr, ΔIisvr) on a plane determined by the effective component IrSVR and the invalid component IiSVR of the passing current of the SVR. The upper rank ΔV extraction unit 460 extracts an upper rank ΔV (Irsvr, Iisvr, ΔV upper rank) from an arbitrary divided section (ΔIrsvr, ΔIisvr).

  The multiple regression analysis unit 480 performs multiple regression analysis on the extracted (Irsvr, Iisvr, ΔV upper rank) data set for each data acquisition time zone, and obtains a set value for each time zone. The solar radiation amount and settling value associating unit 500 associates the settling value for each time zone obtained by the multiple regression analysis unit 480 and the solar radiation amount for each time zone measured by the solar radiation meter 185 and stores them in the database DB5. . Thereafter, a set value corresponding to the amount of solar radiation is output to the outside, and a set value 350 is set for the automatic voltage regulator 300.

  On the other hand, the tap controller 310 of the automatic voltage regulator 300 on the side that receives the settling value 350 includes a sensor 170 that measures the amount of electricity in the distribution line and a tap controller that controls the tap of the transformer as shown in FIG. 310.

  FIG. 3 shows a specific circuit configuration example regarding the transformer 305 and the control unit 310 of the automatic voltage regulator (SVR) according to the present embodiment. First, the concept of tap control will be described, and then the relationship between the set value 350 given by the distribution facility design support system 400 and the line voltage drop compensation circuit LDC will be described.

  The automatic voltage regulator 300 shown in FIG. 3 includes a single-turn transformer, a tap changer 302, and a tap controller 310.

  The tap control device 310 includes a measurement unit 320, a plurality of line voltage drop compensation circuits LDC 1 and LDC 2, a tap control unit 340, databases DB 1 and DB 2, and a set value selection unit 345, and the secondary side of the autotransformer 302. The tap changer 302 is operated to control the voltage to a predetermined value. The set value selection unit 345 will be described later with reference to FIG. Here, the set value 350 given by the distribution facility design support system 400 is held in the database DB2.

  Databases DB1 and DB2 store various operation set values for executing tap control. These include parameters (voltage Vref, impedance R, X), dead band VE, timer time constant τ, operation time constant T, and the like for performing line voltage drop compensation calculation (LDC calculation). The settling value 350 given to the database DB2 by the power distribution facility design support system 400 may include all of these, but at least the impedances R and X are determined by processing in the power distribution facility design support system 400. .

  A sensor CT that measures the secondary current Isvr of the distribution line and a sensor PT that measures the secondary voltage Vsvr are connected to the measurement 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 measurement unit 320 deviates from a predetermined limit value, and this state continues for a predetermined measurement time or longer. Therefore, tap switching control is executed via the tap control unit 340.

  In the example shown in 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. Device. Any of the line voltage drop compensation circuits LDC controls the voltage at the virtual point of the distribution system from the secondary side information of the automatic voltage regulator 300 to a predetermined range, but the line voltage drop compensation circuit LDC1 The line voltage drop compensation circuit LDC2 takes measures against the problems in the solar power generation device PV, while no countermeasures are taken for the problems in the device PV.

  Moreover, regarding the point provided with LDC1 and LDC2 as the line voltage drop compensation circuit LDC, both of the settings may be configured to take measures against problems in the solar power generation device PV. When the voltage is limited within a predetermined range, the line voltage drop compensation circuits LDC1 and LDC2 can be used to set an upper limit and a lower limit.

  The present embodiment does not necessarily require the two systems of line voltage drop compensation circuit LDC, but when the system includes two systems of line voltage drop compensation circuit LDC, the line voltage drop compensation circuit LDC1 is a photovoltaic power generation. 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 when the device PV does not output.

  FIG. 4 shows an example of calculating the tap switching command 303 by the tap control unit 340. In step S <b> 1, the tap control unit 340 calculates the active power Psvr and the reactive power Qsvr from the secondary side current Isvr and the secondary side voltage Vsvr measured by the measurement unit 320. This process may be calculated by, for example, the line voltage drop compensation circuit LDC1 out of the two line voltage drop compensation circuits LDC. Instead of calculating in this way, a method of directly measuring active power Psvr and reactive power Qsvr may be used. Instead of such active power Psvr and reactive power Qsvr, the tap control unit 340 may obtain the effective component Irsvr and reactive component Iisvr of the passing current of the automatic voltage regulator (hereinafter also abbreviated as “SVR”). In the following example, description will be made assuming that the active component Irsvr and the ineffective component Iisvr are used.

  In the next step S2, the line voltage drop compensation circuit LDC1 reads the parameters (R1, X1, and the voltage Vref1 as impedance) of the database DB1, and executes equation (1). The tap control device 310 calculates the tap operation determination reference value Vs1 by executing the following equation (1).

  Here, the impedances R1, X1 and the voltage Vref1 are parameters that are set in advance and stored in the database DB1, and Irsvr and Iisvr are the real part of the passing current obtained from the measured passing current Isvr and the power factor cos θ, respectively. , The imaginary part of the passing current. R1 represents a coefficient for the real part Irsvr of the passing current of SVR, X1 represents a coefficient for the imaginary part Iisvr of the passing current of SVR, and Vref1 represents a reference voltage.

  In step S2 in FIG. 4, an example of a calculation formula is obtained in which the term R1 · Irsvr is obtained as the product of the active power Psvr and the coefficient Ap1, and the term X1 · Iisvr is obtained as the product of the reactive power Qsvr and the coefficient Aq1. This shows the same result regardless of which method is used.

  Similarly, in step S3, the line voltage drop compensation circuit LDC2 reads the parameters (R2, X2, and voltage Vref2 as impedance) shown in the database DB2, and executes equation (2). By executing the expression (2) in the tap control device 310, the tap operation determination reference value Vs2 is calculated.

  Here, R2, X2, and Vref2 are preset parameters, and Irsvr and Iisvr are a real part and an imaginary part of the passing current obtained from the measured passing current Isvr and the power factor cosθ, respectively. R2 represents a coefficient for the real part Irsvr of the passing current of SVR, X2 represents a coefficient for the imaginary part Iisvr of the passing current of SVR, and Vref2 represents a reference voltage.

  Step S3 in FIG. 4 represents an example of a calculation formula in which the term R2 · Irsvr is obtained as the product of the active power Psvr and the coefficient Ap2, and the term X2 · Iisvr is obtained as the product of the reactive power Qsvr and the coefficient Aq2. However, the same result can be obtained regardless of which method is used.

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

  When the secondary voltage Vsvr of the SVR exceeds a predetermined positive / negative limit value ε1 with respect to the reference value Vs1 (step S4: No), a time satisfying the condition of step S4 is provided in the tap control device in step S5. In step S6, when the value exceeds Tsvr1, a tap switching command is issued. After tap switching, Tsvr1 is reset in step S7.

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

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

  When the secondary voltage Vsvr of the SVR exceeds a predetermined positive / negative limit value ε2 with respect to the reference value Vs2 (step S8: No), a time satisfying the condition of step S8 is provided in the tap control device in step S9. In step S10, when the value exceeds Tsvr2, a tap switching command is issued. After tap switching, Tsvr2 is reset in step S11.

  According to the above processing determination, when the SVR secondary voltage Vsvr is smaller than the reference value Vs1 by a certain value ε1 or more and a certain time (for example, Tsvr1 second) has elapsed, the SVR tap changer 302 is changed in the upward direction. Then, the secondary side voltage is increased. On the contrary, when the secondary voltage Vsvr of the SVR is larger than the reference value Vs1 by a predetermined value ε1 or more and a predetermined time elapses, the SVR tap changer 302 is changed in the lowering direction to lower the secondary voltage. To do.

  Similarly, when the secondary voltage Vsvr of the SVR is smaller than the reference value Vs2 by a constant value ε2 or more and a predetermined time (for example, Tsvr 2 seconds) elapses, the SVR tap changer 302 is changed in the upward direction, Increase the side voltage. On the contrary, when the secondary voltage Vsvr of the SVR is larger than the reference value Vs2 by a certain value ε2 or more and a predetermined time elapses, the SVR tap changer 302 is changed to the lowering direction and the secondary voltage is lowered. To do.

  FIG. 5 shows the relationship between the power distribution facility design support system 400 and the various measuring units 200. The effective component Irsvr and the reactive component Iisvr of the passing current of the SVR are measured by the measuring unit 320 (see FIG. 3) in the SVR, and the distribution equipment design support is provided from the slave station 190 via the dedicated line 191 and the distribution automation system 800. Acquired in system 400.

  As for the terminal voltage of the photovoltaic power generator PV, the voltage from the voltmeter 180 is acquired by the distribution facility design support system 400 from the slave station 190 via the dedicated line 191 and the distribution automation system 800.

  The amount of solar radiation is also acquired by the distribution facility design support system 400 from the slave station 190 via the dedicated line 191 and the distribution automation system 800 in the solar radiation meter 185 installed in the vicinity of the distribution system.

  If the solar radiation meter 185 is not installed, the solar radiation amount of the area is obtained from the solar radiation amount measurement data from the Japan Meteorological Agency. The settling value 350 is transmitted from the distribution facility design support system 400 to the SVR via the distribution automation system 800, the dedicated line 191 and the slave station 190.

  FIG. 6 shows a configuration example of the facility design support system 400. The facility design support system 400 includes a display device 11 that displays calculation results obtained as a result of various units, an input unit 12 for receiving input from a user of the system, a CPU 13 that executes each process, a communication unit 14, and A RAM 15 for holding the calculation process is provided.

  Furthermore, the facility design support system 400 includes a data group (target distribution system, solar radiation measurement value, solar power generation device PV arrangement / capacity, load pattern, SVR arrangement) constituting the distribution system, measured SVR passing currents Irsvr, Iisvr, Database DB3 for storing the data ΔVlim that contributes to the suppression of the output of the photovoltaic power generation device from the difference voltage ΔV, etc., DB1 and DB2 for storing LDC parameters, target distribution system, SVR arrangement, solar power generation A database DB4 that stores the arrangement / capacity of the equipment, load patterns, etc., and many settling 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. A database DB5.

  Next, specific processing contents in the facility design support system 400 will be described in order. First, the processing contents of the on-plane divided section determination unit 440 will be described.

  FIG. 7 shows an example of the procedure for determining the divided sections (ΔIrsvr, ΔIisvr) on the (Irsvr, Iisvr) plane. In step S441, the on-plane division section determination unit 440 acquires the power factors cos θ and sin θ from the measured values P and Q, or directly measures the SVR passing effective current Irsvr and the reactive current Iisvr.

  Next, in step S442, the on-plane division section determination unit 440 calculates SVR passing currents Irsvr and Iisvr from the average value of the measured currents. By this stage, the potential difference ΔVi (i = 1, 2,... N) between the SVR and the output points of the plurality of photovoltaic power generation devices has also been obtained, and the SVR passing currents Irsvr, Iisvr and SVR and the plurality of suns are obtained. It is assumed that the potential difference ΔVi between the photovoltaic power generation output points is obtained in association with the information on the measurement time.

  Further, in step S443, the on-planar segment determination unit 440 determines whether the Irsvr.Isvr.Iisvr data distribution is based on the Irsvr, Iisvr data distribution. Assuming a coordinate plane constituted by Iisvr, this plane is segmented. In plane segmentation, if the maximum and minimum values of Irsvr and Iisvr are about ± 100 A, the unit of segmentation is set to ΔIrsvr = ΔIisvr = 10 A, thereby dividing the plane of Irsvr and Iisvr into 20 × 20. As a result, it is possible to stably perform the multiple regression analysis, which is a subsequent process. The unit of this segmentation can be set as appropriate by the user of this system.

  As described above, the on-plane divided section determination unit 440 assumes a two-dimensional coordinate plane composed of Irsvr and Iisvr, and divides the two-dimensional coordinate plane into a plurality of sections to perform plane segmentation. .

  Next, the processing content of the higher rank ΔV extraction unit 460 will be described. FIG. 8 shows the processing contents of the higher rank ΔV extraction unit in the equipment design support system. In step S461, the upper rank ΔV extraction unit 460 assumes a three-dimensional space due to the potential difference ΔV between the SVR passing currents Irsvr, Iisvr, SVR, and the output points of the plurality of photovoltaic power generation devices.

  Specifically, the upper rank ΔV extraction unit 460 has a value of ΔV in the three-dimensional coordinates (Irsvr, Iisvr, ΔV) belonging to the respective section sections (ΔIrsvr, ΔIisvr) divided by the SVR passing currents Irsvr, Iisvr. Sort in descending order.

  In step S462, the higher rank ΔV extraction unit 460 selects data in which the value of ΔV is the first highest, second, third in the (Irsvr, Iisvr.ΔV) data set sorted in descending order of the value of ΔV. select. The user of this system can appropriately set the top number to be selected.

  In the three-dimensional space by Irsvr, Iisvr and ΔV conceptually shown in FIG. 13, the plane area 99 is divided into units of ΔIrsvr and ΔIisvr with respect to the plane coordinates by the SVR passing currents Irsvr and Iisvr, and A three-dimensional space is assumed in which the potential difference ΔV between the SVR and a plurality of photovoltaic power generation output points is adopted in the height direction. Note that the potential difference ΔV in the segmented planar region 99 is indicated by ◯ or ●, but here, the potential rank ΔV having a larger potential difference ΔV is indicated by ●.

  Further, in step S462, the upper rank ΔV extraction unit 460 assigns a selection flag to the data set in the range 98 in which the value of the potential difference ΔV is first, second, and third (Irsvr, Iisvr, ΔV). Yes (assuming no setting is set) Depending on whether this selection flag is set or not, it is possible to discriminate data when performing multiple regression analysis, and the multiple regression analysis process shown in FIG. 9 is started.

  FIG. 9 shows an example of the multiple regression analysis process. In step S900, the multiple regression analysis unit 480 sets, for example, 1 hour (or 3 hours) as a unit time for performing multiple regression analysis.

  In step S901, the multiple regression analysis unit 480 searches for a combination of the photovoltaic power generation devices PVi. In step S902, the multiple regression analysis unit 480 extracts the combination of the photovoltaic power generation devices PVi with the selection flag == 1, and if the combination of the photovoltaic power generation devices PVi with the selection flag == 1 is not found, the above-described case. Executed from step S901.

  On the other hand, when the combination of the photovoltaic power generation devices PVi with the selection flag == 1 is found, in step S903, the multiple regression analysis unit 480 ends the photovoltaic power generation device PVi with the SVR secondary voltage and the selection flag == 1. A multiple regression analysis calculation is executed between the potential difference ΔV with respect to the voltage and the SVR passing currents Irsvr and Iisvr, and α satisfying ΔV = α × Irsvr + β × Iisvr + ΔV0 is set as the set value R (Ω) of the SVR LDC2.

  Further, in step S904, the multiple regression analysis unit 480 performs multiple regression analysis between the potential difference ΔV between the SVR secondary voltage and the photovoltaic power generation device PVi end voltage at which the selection flag = 1, and the SVR passing current Iisvr. And settling value ΔV0 is calculated from the Z-axis intercept.

  Further, in step S905, the multiple regression analysis unit 480 performs multiple regression analysis between the potential difference ΔV between the SVR secondary voltage and the photovoltaic power generation device PVi end voltage at which the selection flag = 1, and the SVR passing current Iisvr. And β where ΔV = α × Irsvr + β × Iisvr + ΔV0 is set as the set value X (Ω) of the SVR LDC2.

  Next, if all the data combination patterns have not been searched, the multiple regression analysis unit 480 returns to step S901 and executes (step S906). If all the data combination patterns have been searched, this processing is performed. After completion, set values R2 and X2 associated with the season / time zone are determined.

  In step S907, if the multiple regression analysis unit 480 completes the calculation for all the time zones in increments of 1 hour (or 3 hours) for the daytime, for example, the process ends. The above processing is performed on the data set included in the unit time.

  For example, the multiple regression analysis process performed for each set time zone, for example, the settling values R2 and X2 obtained in the hourly zone from 6 am to 6 pm with sunshine were obtained. become. The set values R2 and X2 for each time zone are stored in the database DB5 shown in FIG. 2 together with the time information. At this time, the processing in the associating unit 500 for the amount of solar radiation and the settling value causes the overlap. The set value for each time zone obtained by the regression analysis unit 480 and the amount of solar radiation for each time zone measured by the pyranometer 185 are associated with each other and stored in the database DB5.

  In short, the multiple regression analysis process shown in FIG. 9 determines the position in consideration of the photovoltaic power generation device PV that causes output suppression when determining the virtual point determined by the set values R and X of the LVR 2 of the SVR. For example, when there are 100 solar power generation devices PV under the SVR, and 50 of them are solar power generation devices PV that frequently or large-scale output suppression occurs, a hypothesis considering all 100 devices In contrast to the conventional point setting, in the present embodiment, the virtual point setting is performed mainly by 50 solar power generation devices PV that suppress output of the power generation amount.

  For this reason, some can be assumed as a method for realizing virtual point setting mainly using the solar power generation device PV that generates output suppression, and this embodiment may be any of them. As these deformation methods, for example, it is determined only for the solar power generation device PV with a high degree of output suppression, or it is determined by repeated calculation so as to increase the number of solar power generation devices PV that can be saved from the output suppression as much as possible. A method may be considered in which the virtual point is determined by increasing the weighting factor of the photovoltaic power generation device PV that causes output suppression.

  FIG. 10 shows a geometric image of α and β obtained through the multiple regression analysis process shown in FIG. The illustrated example shows a three-dimensional plane 95 determined by the effective component Irsvr, the ineffective component Iisvr of the SVR passing current, and the potential difference ΔV between the secondary voltage of the SVR and the photovoltaic power generator terminal voltage. Here, when the potential difference ΔV is ΔV0, a region represented by a voltage variation ΔΔV when the effective component Irsvr increases and a voltage variation ΔΔV ′ when the invalid component Ii increases is displayed.

  From the relationship in FIG. 10, α and β can be expressed by the equations (3) and (4). The coefficients α and β are none other than determining the settling values R2 and X2 associated with the season and time zone.

(2) First Modification of the Present Embodiment FIG. 11 shows a first modification of the present embodiment. In the following description, only differences from the above-described embodiment will be mainly described.

  In the example shown in FIG. 2 described above, an example in which the signal transmission is performed by separately arranging the SVR and the distribution facility design support system 400 is shown, but in this modification, the set value determination unit 400A is provided in the SVR. .

  The settling value determination unit 400A includes a database DB3A, a planar division determination unit 440A, a higher rank ΔV extraction unit 460A, a multiple regression analysis unit 480A, a solar radiation amount and settling value association unit 500A, a database DB4A, and a database DB5A.

  These database DB3A, upper plane division section determination unit 440A, higher rank ΔV extraction unit 460A, multiple regression analysis unit 480A, solar radiation amount and settling value association unit 500A, database DB4A and database DB5A are respectively described in the above embodiments. This corresponds to database DB3, on-plane divided section determination unit 440, higher rank ΔV extraction unit 460, multiple regression analysis unit 480, solar radiation amount and set value association unit 500, database DB4 and database DB5, except for the following points Have almost the same function.

  In this distribution facility design support system 400A, the measurement unit 200 obtains the SVR passing currents Irsvr and Iisvr, the potential difference ΔVi between the SVR and the PV power generation device PVi output point, and the solar radiation amount, and obtains the upper divided rank determination unit 440A and the upper rank. The ΔV extraction unit 460A selects data having a correlation with the output suppression of the photovoltaic power generation apparatus, and then obtains a set value for each time zone by the multiple regression analysis unit 480A that performs multiple regression analysis.

  Furthermore, in this power distribution facility design support system 400A, the solar radiation amount and settling value association unit 500A stores and stores the settling value for each time zone in the database DB5A in association with the solar radiation amount information. Thereafter, the set value 350 indicates that the tap control 310 is set.

  The concept of the processing described with reference to FIGS. 2 and 11 will be described with reference to FIGS. 12 (A) and 12 (B). First, FIG. 12A shows an example of a planar area configuration of a distribution system that is extended from a substation 110 via an SVR, for example, in a dendritic manner.

  In such a power distribution system, as an example, the photovoltaic power generation device PV is disposed at a position “◯”. Here, it is assumed that the position of the virtual point on the SVR secondary side determined by the operation set 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 planar area configuration of the power distribution system. Therefore, if voltage control is performed for this virtual point, it is possible to appropriately perform voltage control for the entire distribution system.

  On the other hand, FIG. 12B shows the output suppression in the photovoltaic power generation device PV obtained by the on-plane divided section determination unit 440A, the upper rank ΔV extraction unit 460A, and the multiple regression analysis unit 480A of FIGS. Only the photovoltaic power generator PV having a correlation is indicated by “●” as an example.

  In the multiple regression analysis unit 480, in consideration of the arrangement information of the photovoltaic power generation device PV having a correlation with the extracted output suppression, the output suppression is particularly large, and the secondary voltage of the SVR and the terminal voltage of the photovoltaic power generation device PVi. The center of gravity position G2 of the impedance distribution in the planar area configuration of the distribution system is obtained for the photovoltaic power generation device PVi having a large correlation with the potential difference ΔVi.

  FIG. 14 is a diagram illustrating a plane obtained by the multiple regression analysis unit 480A using the data group of ● extracted by the upper divided section determination unit 440A and the upper rank ΔV extraction unit 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, output suppression is particularly large, and the secondary voltage of the SVR and the terminal voltage of the photovoltaic power generator PVi It is possible to configure an SVR considering the photovoltaic power generation device PVi having a large correlation with the potential difference ΔVi.

  FIGS. 15A and 15B show the relationship of the estimation accuracy of the potential difference ΔV in the cases shown in FIGS. 12A and 12B, respectively. More specifically, FIG. 15 (A) and FIG. 15 (B) are respectively the time change (thin solid line) of the potential difference by the conventional method (multiple regression analysis using all data) shown in FIG. The relationship of the estimation accuracy of the potential difference ΔV is shown while comparing the time change (thick solid line) of the potential difference estimated by the method.

  In the illustrated example, if the thick solid line overlaps with the thin solid line, it means that the potential difference ΔV has been accurately estimated, indicating that the control by SVR is performed well. In the illustrated example, it is clear that the estimation of the maximum value of the potential difference ΔV is not good.

  Here, since the maximum value is a region where solar power generation output suppression is highly likely to be performed, the thick solid line should accurately estimate the vicinity of the maximum value of the thin solid line, as shown in FIG. In the example shown, it is a conventional problem that the maximum value of the potential difference ΔV cannot be estimated accurately.

  On the other hand, in the present embodiment, as shown in FIG. 15B, since the thick solid line overlaps the vicinity of the maximum value of the thin solid line, the maximum value of the potential difference ΔV can be accurately estimated. It can be understood that the possibility that the output of the solar power generation apparatus is suppressed is low.

  FIG. 16 shows an example of an association process between the amount of solar radiation and a set value. In the process of associating the solar radiation amount with the set value, first, at step S1701, the associating unit 500 between the solar radiation amount and the set value acquires the solar radiation amount per unit time in the corresponding area. The amount of solar radiation may be data publicly disclosed in the meteorological relations such as the Japan Meteorological Agency or NEDO.

  Next, in step S1702, the solar radiation amount and settling value associating unit 500 acquires a settling value for each unit time calculated by the multiple regression analysis unit 480 as described above. Thereafter, in step S1703, the solar radiation amount and settling value association unit 500 generates a correlation between the solar radiation amount and the settling value for each unit time.

  In this step S1703, there is a method of creating a table by associating the amount of solar radiation for each unit time with a set value, or a method for generating a line format by multiple regression analysis based on a set of unit time of solar radiation amount and set value data. It may be adopted. The solar radiation amount and the set value correlated for each unit time are accumulated in the database DB5 by the associating unit 500 for the solar radiation amount and the set value.

  FIG. 17 shows an example of the set value selection process. In SVR, when the set value selection unit 345 receives the solar radiation amount from the solar radiation meter 185, the set value corresponding to the solar radiation amount is selected with reference to the database DB5 (step S1601). In step S1602, the set value selection unit 345 transmits the set value thus selected to the LDC 2.

  In the set value selection process shown in FIG. 17, the set value selection unit 345 refers to the database DB5 and handles the amount of solar radiation (hereinafter referred to as “reference solar radiation amount”) reflected in the setting of the LDC 2 as follows. Can be considered.

  In other words, in the present embodiment, the reference solar radiation amount is, for example, a time of 1 hour (or a time period in which weather for each hour can be reflected instead of a long period such as a unit of one day such as 3 hours). It should be understood as the average amount of solar radiation in the belt. Thus, it is possible to avoid a situation where the set value is changed variably each time due to instantaneous fluctuations in the amount of solar radiation and the control is not stabilized.

  This reference solar radiation amount may be based on a weather forecast. For example, tomorrow's weather is cloudy (or clear), and many past results have been obtained when the current season's weather is cloudy (or clear), and the estimated reliability of tomorrow's weather forecast is high. If it is known, the solar radiation amount in the past record can be used as the reference solar radiation amount when referring to the database DB5 as reference information on the solar radiation amount tomorrow.

  The reference solar radiation amount may be a predicted solar radiation amount obtained by predicting weather at a future time. In this way, when the current time is 10:00 from the cloud movement, weather forecast, etc. in the neighboring area, the weather at 11:00 after 1 hour is predicted, and the amount of solar radiation at that time is referred to the database DB5. It can be used as a reference solar radiation amount. The predicted 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 of a superordinate concept determined from the above viewpoint can be used. In the present embodiment, these are collectively referred to as “reference solar radiation amount”.

  In FIG. 17, when the set value is extracted by referring to the database DB5 using the reference solar radiation amount, there may be a case where there is not necessarily a perfect match with the condition. Select by condition. For this reason, an appropriate learning process or the like may be employed.

  The operation set values R2 and X2 of the line voltage drop compensation circuit LDC2 in the present embodiment indicate the barycentric position G2. According to the present embodiment, a position closer to the photovoltaic power generation device that is the target of power generation output suppression is set as a virtual point so that the voltage in the vicinity does not deviate from the limit value. In order to adjust the voltage of the distribution system by tap control in SVR, some photovoltaic power generation devices that have many opportunities for output suppression are placed in a preferable environment in which output suppression need not be performed. .

  Conventionally, the output state of the photovoltaic power generator is not considered only by controlling the center of gravity position G1 once determined. However, in this embodiment, some photovoltaic generators having a correlation in descending order of output suppression. Since the center of gravity position G2 is extracted each time, it is possible to avoid the unfairness of the part of the photovoltaic power generation devices PV that has lost power sales opportunities due to output suppression.

  As a result, even if the output of the photovoltaic power generation device PV rises excessively, the tap control in the upstream SVR adjusts the voltage of the distribution system in advance, so the output of the partial photovoltaic power generation device Opportunities leading to suppression can be reduced.

  With the control as described above according to the present embodiment, even in a power system in which a large number of power generating devices such as a solar power generating device are introduced in a branch system, the voltage at the installation point of the solar power generating device is It is possible to avoid the suppression of the output of the solar power generation apparatus that is implemented to avoid the increase, and to reduce the loss of the power sale opportunity by the consumer. Furthermore, by selecting and using the set value of the voltage adjustment device in association with the amount of solar radiation, voltage adjustment can be performed with higher accuracy, and the output suppression amount of the solar power generation device can be reduced. Furthermore, since the wear of the tap due to the hunting operation can be suppressed, the life of the voltage regulator can be further extended.

  Further, according to the present embodiment, the state of the electric power system is changed in the photovoltaic power generation due to the difference in the sunshine conditions even in the same daylight hours, but should be set. By making the set value variable according to the amount of solar radiation, it is possible to contribute to finer control of the power system.

  Although the present embodiment described above is various, in any case, based on information obtained from the power distribution system within a predetermined time period, the impedance of the distribution system in a predetermined time period is determined by time period. An impedance derivation unit, a solar radiation amount obtaining unit for obtaining the solar radiation amount in a predetermined time zone, a database for storing the impedance and solar radiation amount in association with the same predetermined time zone, and a reference solar radiation amount with reference to the database by the standard solar radiation amount And an impedance extraction unit that obtains the impedance at the time, and using the extracted impedance as a set value, the tap value is adjusted so that the voltage at the virtual point of the distribution system is set as the set voltage.

  Here, the above-described impedance derivation unit for each time zone corresponds to the main configuration of the on-plane divided section determination unit 440, the upper rank ΔV extraction unit 460, and the multiple regression analysis unit 480 in FIG. The unit corresponds to a process of obtaining data from the pyranometer 185 or a process of obtaining data from the measurement unit 200, the database corresponds to the database DB5, etc., and the impedance extraction unit is the set value selection unit 345 or settling This corresponds to value selection processing (see FIG. 17).

  FIG. 18 shows an example of a settling value correction process for avoiding a hunting operation. In the example shown in the figure, processing for correcting the set value of the first line voltage drop compensation circuit LDC1 and the set value of the second line voltage drop compensation circuit LDC2 is shown. First, the hunting operation determination unit 600 acquires the set value of the first line voltage drop compensation circuit LDC1 and the set value 350 of the second line voltage drop compensation circuit LDC2 selected according to the amount of solar radiation (step S1801). , S1802).

  Thereafter, when an SVR one-tap operation (± 100 V) is performed, the estimated voltage of the first line voltage drop compensation circuit LDC1 deviates from the upper limit voltage of the second line voltage drop compensation circuit LDC2, and the first When the value deviates from the lower limit voltage of the line voltage drop compensation circuit LDC1 (corresponding to the case where the hunting judgment is true by the hunting operation condition judgment formula), the hunting action judgment unit 600 sets the set value of the first line voltage drop compensation circuit LDC1. And the setting value of the second line voltage drop compensation circuit LDC2 are close to each other, so that the setting value of the second line voltage drop compensation circuit LDC2 is slightly changed in the direction away from the hunting operation. The set value is corrected (step S1803).

  FIG. 19 shows an example of the overall configuration of a distribution facility design support system for determining a set value for the LRT instead of the above-described SVR. FIG. 20 shows an example of the relationship between the LRT and the distribution facility design support system. If the LRT is also an LDC type, the first line voltage drop compensation circuit LDC1 and the second line voltage drop compensation circuit LDC2 can be set similarly to the SVR.

  If the LRT is a process computer type, it is necessary to determine a set value to be used for each time zone in advance. In that case, the pattern of the solar radiation amount for each time zone is analyzed with data for one year. The settling value can be determined by selecting the settling value according to the pattern for each solar radiation amount time zone.

(3) Second Modified Example of the Present Embodiment The embodiment as described above may be an optimum settling method corresponding to the following SVR remote settling value adjustment. As the communication infrastructure related to the distribution automation system is reconstructed, the set value such as SVR is set remotely. In such a case, instead of setting the set value to a fixed value, for example, it is possible to operate more effectively by dynamically changing the setting value based on the season or time.

(3-1) Basic Concept of Remote Settling Method FIG. 21 shows a configuration example when the present embodiment is a remote settling method. In the above-described embodiment, a settling value is calculated in advance using past measurement data, and the settling value is set in advance in SVR or the like. On the other hand, in this remote settling method, an optimal settling value is selected and set each time using real-time measurement data such as the amount of solar radiation and PV output. Alternatively, the set value may be determined dynamically with a single SVR.

(3-2) Study on dynamic change of settling value In order to realize the remote settling method, we analyzed the effects of differences in weather and measurement intervals on the settling value. In the influence analysis, the measured value (1 second interval) of the distribution line was used.

  In order to grasp the influence of the weather on the settling value, if the settling value is calculated by multiple regression analysis using measured values on cloudy and sunny days, the photovoltaic power output increases and the voltage rises on the blue sky day Therefore, the optimal settling value can be dynamically selected using the amount of solar radiation.

  FIG. 22 shows an example of an image of a settling value space and a settling value function. Furthermore, in order to make it possible to select a settling value dynamically on the system, when the influence of differences in measurement conditions and settling conditions on the setpoint is analyzed, there is a strong linear correlation. It is possible to determine a linear function (hereinafter referred to as “settling value function”) SF regarding the value.

  Therefore, for example, by taking into account the plane N where ΔVref = ΔV′ref, ΔVref is determined using information such as the amount of solar radiation or the amount of output of photovoltaic power generation, thereby using the strong correlation of the settling value. Thus, R and X can be determined, and an optimal settling value can be selected from the measured values, or dynamic settling can be realized with a single SVR.

(4) Other Embodiments The above embodiment is an example for explaining the present invention, and is not intended to limit the present invention only to these embodiments. The present invention can be implemented in various forms without departing from the spirit of the present invention.

  The present invention can be widely applied to a voltage adjustment device, a voltage adjustment system, a voltage adjustment method, and a distribution facility design support system for a distribution system that adjusts the voltage of the distribution system.

  100 ... Distribution system, 110 ... Distribution substation, 120 ... Node, PV ... Photovoltaic generator, 140 ... Distribution line, 150 ... Load, 170 ... Sensor, 180 ... Voltmeter, 185 ...... Pirometer, 200 ... Measurement unit, 300 ... Automatic voltage regulator, 305 ... Transformer, 310 ... Tap control device, 320 ... Measurement unit, 340 ... Tap control unit, 345 ... Set value Selection unit 350... Setting value CT CT current sensor PT voltage sensor DB1, DB2, DB3, DB4, DB5 database LDC1, LDC2 ... first and second line voltage drop compensation circuits .

Claims (11)

A voltage regulator for a power distribution system comprising a transformer with a tap that is installed in a power distribution system including a plurality of photovoltaic power generation devices and adjusts a tap value to set a voltage at a virtual point of the power distribution system as a set voltage. ,
Based on information obtained from the power distribution system within a predetermined time zone, an impedance deriving unit for each time zone for obtaining an impedance that is a set value of the voltage regulator, which is uniquely determined for the power distribution system in the predetermined time zone;
A solar radiation amount obtaining unit for obtaining a solar radiation amount in the predetermined time zone, a database for storing the impedance and the solar radiation amount in association with the same predetermined time zone, and
An impedance extraction unit for obtaining the impedance at the reference solar radiation amount with reference to the database based on a reference solar radiation amount;
A tap adjustment unit that adjusts a tap value to set a voltage at a virtual point of the distribution system as a set voltage using the extracted impedance as a settling value;
A hunting operation determination unit that corrects to a set value that avoids hunting operation when hunting determination is true according to a predetermined hunting operation condition determination formula;
A voltage regulator for a distribution system, comprising: The information obtained from the power distribution system is an effective 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 impedance derivation unit for each time zone is
On the plane determined by the effective component and reactive component of the passing current of the transformer with tap, on-plane divided section determination unit for determining the divided section;
An upper rank potential difference extraction unit that ranks the potential differences in the divided sections in descending order and extracts a plurality of upper potential differences;
A multiple regression analysis unit that performs a multiple regression analysis using the extracted plurality of potential differences, and determines an impedance of the tapped transformer;
The voltage regulator for a power distribution system according to claim 1, comprising:   Obtain information from the measurement unit about the passing current of the transformer with the tap, the potential difference between the installation point of the transformer with the tap and the solar power generation device, and the amount of solar radiation, the information from the measurement unit, and the target A storage section including information on the configuration of the power distribution system, information on the arrangement and capacity of the photovoltaic power generation device, information on the load pattern, and information on the arrangement data of the tapped transformer, The voltage regulator for a power distribution system according to claim 2.   The settling value representing the distance from the tapped transformer to the virtual point is an impedance between the tapped transformer and the virtual point or a coefficient related to the impedance. The voltage regulator for a distribution system according to claim 3. A first line voltage drop compensation circuit that adjusts a tap value of the tapped transformer to set a voltage at a first virtual point in the distribution system as a set voltage;
A second line voltage drop compensation circuit that adjusts the tap value of the tapped transformer so that the voltage at the second imaginary point in the distribution system is set to the set voltage by using the set value obtained by the impedance extraction unit. When,
The voltage regulator for a distribution system according to any one of claims 2 to 4, further comprising: The reference solar radiation amount is
6. The solar radiation amount determined based on a measured solar radiation amount, a past solar radiation amount, or a solar radiation amount determined based on a weather forecast, according to claim 1. Voltage regulator for distribution system. A voltage regulator for a distribution system, which is installed in a distribution system including a plurality of photovoltaic power generation devices, and includes a transformer with a tap for adjusting a tap value so that a voltage at a virtual point of the distribution system is a set voltage; A voltage adjustment system for a distribution system including a facility design support system,
The power distribution facility design support system is:
Based on information obtained from the power distribution system within a predetermined time zone, an impedance deriving unit for each time zone for obtaining an impedance that is a set value of the voltage regulator, which is uniquely determined for the power distribution system in the predetermined time zone;
A solar radiation amount obtaining unit for obtaining the solar radiation amount in the 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,
The tapped transformer is
An impedance extractor for extracting the impedance at the reference solar radiation amount with reference to the database based on a reference solar radiation amount;
A tap adjusting unit that adjusts a tap value to set a voltage at a virtual point of the distribution system as a set voltage using the extracted impedance as a settling value;
A hunting operation determination unit that corrects to a set value that avoids hunting operation when hunting determination is true according to a predetermined hunting operation condition determination formula;
A voltage regulation system for a power distribution system comprising: The power distribution facility design support system is:
Information about the current passing through the transformer with the tap, the potential difference between the installation point of the transformer with the tap and the photovoltaic power generator, the amount of solar radiation from the measurement unit, and the information about the configuration of the target distribution system; The storage unit for storing the information on the arrangement / capacity of the photovoltaic power generation apparatus, the information on the load pattern, and the information on the arrangement data of the transformer with a tap is provided. Voltage distribution system for the described distribution system. A voltage adjustment method for a distribution system including a transformer with a tap that is installed in a distribution system including a plurality of photovoltaic power generation devices and adjusts a tap value so as to set a voltage at a virtual point of the distribution system as a set voltage. ,
Based on the information obtained from the power distribution system within a predetermined time zone, the voltage adjustment device obtains an impedance, which is a set value of the voltage regulator device, which is uniquely determined for the power distribution system in the predetermined time zone, and the predetermined time A storage step of obtaining an amount of solar radiation in a band and storing the impedance and the amount of solar radiation in the same predetermined time period in association with each other;
The voltage regulator refers to the impedance and the amount of solar radiation stored in association with each other, extracts the impedance at the time of a standard solar radiation amount, and uses the extracted impedance as a set value to determine a voltage at a virtual point of the distribution system. An adjustment step for adjusting the tap value to be a set voltage,
A voltage adjustment method for a power distribution system, comprising: A power distribution device comprising a plurality of photovoltaic power generation devices and a voltage adjustment device including a transformer with a tap for adjusting a tap value so that a voltage at a virtual point of the distribution system is set to a set voltage according to a given set value A distribution facility design support system for a distribution system that is applied to a system and gives a settling value for estimating a voltage at the virtual point,
As information obtained from the distribution system within a predetermined time zone, based on the effective and invalid components of the passing current of the tapped transformer, and the potential difference between the tapped transformer and the plurality of photovoltaic power generation devices An impedance deriving unit for each time zone for obtaining an impedance that is a set value of the voltage regulator, which is uniquely determined for the power distribution system in the predetermined time zone,
A solar power output obtaining unit for obtaining a solar power output in the predetermined time zone;
A database for storing the impedance and the photovoltaic power generation output in association with each other in the same predetermined time period;
An output for providing the impedance extracted from the database to the tapped transformer;
A hunting operation determination unit that corrects to a set value that avoids hunting operation when hunting determination is true according to a predetermined hunting operation condition determination formula;
A distribution facility design support system for a distribution system, comprising:   The passing current of the transformer with tap, the potential difference between the installation point of the transformer with tap and the photovoltaic power generation apparatus, information from the measurement unit about the amount of solar radiation, information on the configuration of the target distribution system, The storage unit for storing the information on the arrangement / capacity of the photovoltaic power generation apparatus, the information on the load pattern, and the information on the arrangement data on the tapped transformer is provided. Distribution system design support system for the distribution system in Japan.

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