JP5345453B2 - Demand curve separation method, separation device, and separation program - Google Patents

Description

  The present invention relates to a demand curve separation method, a separation device, and a separation program. More specifically, the present invention relates to a technique for separating a demand curve, which is active power according to time between each line of a distribution line, into a photovoltaic power generation output curve and a load curve.

  In distribution enhancement work such as distribution line interchange calculation at the time of distribution line work and distribution line switching, or countermeasure construction when new demand occurs or distribution facility expansion work that takes into account growth in annual demand, In general, the surplus supply capacity is studied using

  In addition, when considering measures for suppressing voltage imbalances that are feared to deteriorate, it is necessary to balance the load temporally and spatially, so it is important to grasp the actual state of the load.

  In principle, the power flow direction of the distribution line is only the forward direction from the power plant to the customer side, but with the spread of solar power generation, it is necessary to consider reverse power flow from solar power generation. . Since the output of photovoltaic power generation fluctuates greatly depending on the weather and time zone, when a large amount of photovoltaic power generation is introduced into the distribution system, the power flow of the distribution line also changes in a complex manner, and the actual state of the load is grasped. Becomes difficult.

  And if the distribution load supply capacity cannot be determined due to the complicated distribution line flow and the distribution line supply capacity is misjudged, the distribution line equipment is overloaded or the legal voltage deviates due to a voltage drop. The problem may occur.

  For the above reasons, it is very important to grasp the actual situation of photovoltaic power generation output and load included in the power flow of the distribution line from the viewpoint of facility planning, operation management and power quality of the distribution line. It is necessary to separate the photovoltaic power output and the load from

  As a conventional technique for calculating distribution line interchange at the time of system switching at the time of distribution line work or distribution line accident, when there is a distributed power source that is connected to the distribution system, the distributed power source is connected to the connection condition, Classification based on information on contract conditions and electrical characteristics, evaluation of multiple distribution systems to the tolled section using the classification result, using meta-heuristic method, and based on this evaluation Some include a step of selecting one distribution system from among a plurality of distribution systems, a step of switching the distribution system based on the selection, and a step of re-transmission to the interchanged section through the switched distribution system ( Patent Document 1).

JP 2005-117787 A

  However, in the technique of Patent Document 1, it is assumed that a distributed power source is connected to the distribution system, but the distributed power source output and the load are not separated from the distribution line power flow. . For this reason, when photovoltaic power generation as a distributed power source is connected to the distribution system, it is impossible to grasp the actual situation about the photovoltaic power generation output and load included in the power flow of the distribution line. There is a problem that the facility planning, operation management, and maintenance of power quality cannot be properly performed.

  Therefore, an object of the present invention is to provide a demand curve separation method, a separation device, and a separation program capable of separating a demand curve between each line of a distribution line into a photovoltaic power generation output curve and a load curve.

  In order to achieve this object, the demand curve separation method according to claim 1 calculates the difference between the demand curves between the lines in the night time zone of the three-phase distribution line and the difference between the night time zone differences. Step, calculating the difference in demand curve between each line in daytime time zone of three-phase distribution line, ratio of difference in night time zone, difference in daytime time zone, and photovoltaic power generation equipment capacity between each line of three-phase distribution line The step of calculating the photovoltaic power generation output curve between the lines in the daytime time period using the ratio, and the step of calculating the load curve between the lines using the demand curve between the lines and the photovoltaic power generation output curve between the lines. And have

  The demand curve separating apparatus according to claim 2 is a means for reading demand curve data between each line of a three-phase distribution line from a storage means, and the demand between each line in a night time zone using the demand curve data between each line. Means for calculating the difference between the curves, means for calculating the ratio of the difference in the night time period, means for calculating the difference in the demand curve between the lines in the day time period using the data of the demand curve between the lines, Means for calculating the solar power output curve between each line in the daytime time period using the ratio of the difference in the night time period, the difference in the daytime time period, and the capacity ratio of the photovoltaic power generation facilities between the lines of the three-phase distribution line, and each line Means for calculating a load curve between the lines using a demand curve between the lines and a photovoltaic power generation output curve between the lines.

  The demand curve separation program according to claim 3 is a means for reading demand curve data between each line of a three-phase distribution line from storage means, and a demand curve between each line in a night time zone using the demand curve data between each line. Means for calculating the difference between the lines, means for calculating the ratio of the difference in the night time zone, means for calculating the difference in the demand curve between the lines in the day time zone using the demand curve data between the lines, Means for calculating the photovoltaic power output curve between each line in the day time period using the ratio of the difference, the difference in the day time period, and the ratio of the photovoltaic power generation capacity between the lines of the three-phase distribution line, the demand curve between each line, and The computer is caused to function as a means for calculating a load curve between the lines using the photovoltaic power generation output curve between the lines.

Here, the present invention is used on the premise of the following two characteristics relating to a demand curve between each line of a three-phase distribution line in a three-phase unbalanced state per day.
1) The lamp load curves between the lines are similar to each other.
Regarding this characteristic, it is known that the lighting load curve between each line is similar when the number of customer houses between each line is 400 or more (New Energy and Industrial Technology Development Organization: 1999 Load Concentration Control). System establishment verification test (load centralized control system establishment verification test) System test and evaluation, 1999 NEDO Research Report, March 2000). The light load curve refers to a light contract load curve for general households excluding late-night loads such as electric water heaters.

2) The photovoltaic power generation output curves between the lines are similar to each other.
With regard to this characteristic, the solar power output curve is proportional to solar radiation, so if the area is limited, such as between line switches, the change in solar radiation is the same, and the solar power output curves between each line are similar to each other. It is based on what is considered to be.

  According to the demand curve separation method, the separation device, and the separation program according to claims 1 to 3, the demand curve between the lines resulting from the difference in operating time between the elements constituting the load curve and the photovoltaic power generation Based on the characteristics of each time zone, the solar power generation output curve in the daytime time zone is calculated, and the load curve included in the demand curve between each line is calculated using the solar power generation output curve, and distributed to the distribution system The demand curve between each line of the distribution line when the photovoltaic power generation as the power source is linked is separated into the photovoltaic power generation output curve and the load curve.

  According to the demand curve separation method, separation device and separation program of the present invention, paying attention to the fact that the operation time of each element constituting the load curve and the photovoltaic power generation is different, the photovoltaic power generation is connected to the distribution system. Because the demand curve between each line of the distribution line can be separated into the photovoltaic power output curve and the load curve, grasp the actual situation about the photovoltaic power output and the load included in the power flow of the distribution line This makes it possible to properly carry out facility planning, operation management, and power quality maintenance of distribution lines.

It is a flowchart explaining the demand curve separation method of embodiment. It is a functional block diagram of the demand curve separation apparatus in the case of implementing the demand curve separation method of embodiment using a program. It is a figure explaining the calculation method of the demand curve between each line based on the data measured by the apparatus attached to the distribution line. It is a figure which shows the demand curve between each line of embodiment. It is a figure which shows the load curve and photovoltaic power generation output curve of each component about the demand curve of line AB of embodiment. It is a figure explaining that the ratio of the difference of the demand curve for every line in a night time zone is constant while explaining the characteristic according to the time curve of the demand curve between lines. It is a figure which shows the isolation | separation result to the photovoltaic power generation output curve and load curve of the demand curve between each line of embodiment.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  FIG. 1 to FIG. 7 show examples of embodiments of the demand curve separation method, separation device, and separation program of the present invention. As shown in FIG. 1, the demand curve separation method of the present embodiment includes a step (S1) of reading demand curve data between each line of the three-phase distribution line from the storage means, and a line between the lines in the night time zone of the three-phase distribution line. While calculating the difference of the demand curve (S2), calculating the ratio of the difference of the night time zone (S3), calculating the difference of the demand curve between each line in the daytime time zone of the three-phase distribution line, A step of calculating a photovoltaic power generation output curve between the lines in the daytime period using the ratio of the difference in the nighttime period, the difference in the daytime period, and the capacity ratio of the photovoltaic power generation facility between the lines of the three-phase distribution line (S4) And a step (S5) of calculating a load curve between the lines using the demand curve between the lines and the photovoltaic power generation output curve between the lines.

  The demand curve separation method is realized as the demand curve separation device of the present invention. The demand curve separation device of the present embodiment includes a means for reading demand curve data between each line of the three-phase distribution line from the storage means, and a difference between the demand curves between the lines in the night time zone using the demand curve data between the lines. Calculating the difference of demand curve between each line in the daytime time zone using the data of the demand curve data between each line and the means for calculating the difference ratio of the night time zone and the difference of the night time zone Means for calculating the solar power output curve between each line in the daytime time zone using the ratio of the ratio and the difference between daytime hours and the solar power generation capacity ratio between each line of the three-phase distribution line, and the demand curve between each line, Means for calculating a load curve between the lines using a photovoltaic power generation output curve between the lines.

  The above-described demand curve separating apparatus can also be realized by executing the demand curve separating program of the present invention on a computer. In the present embodiment, a case where a demand curve separation program is executed on a computer will be described as an example.

  FIG. 2 shows the overall configuration of the demand curve separating apparatus 10 of the present embodiment for executing the demand curve separating program 17. The demand curve separating apparatus 10 includes a control unit 11, a storage unit 12, an input unit 13, a display unit 14, and a memory 15, and is connected to each other by a signal line such as a bus. A data server 16 is connected to the demand curve separating apparatus 10 by a signal line such as a bus, and signals such as data and control commands are transmitted / received (ie, input / output) to / from each other via the signal line.

  The control unit 11 performs the calculation related to the control of the entire demand curve separation device 10 and the separation of the demand curve by the demand curve separation program 17 stored in the storage unit 12, for example, a CPU (ie, central processing unit). It is. The storage unit 12 is storage means capable of storing at least data and programs, and is, for example, a hard disk. The memory 15 serves as a memory space that is a work area when the control unit 11 executes various controls and calculations, and is, for example, a RAM (abbreviation of Random Access Memory).

  The input unit 13 is an interface for giving at least an operator's command to the control unit 11, and is, for example, a keyboard.

  The display unit 14 performs drawing / display of characters, graphics, and the like under the control of the control unit 11 and is, for example, a display.

  And by executing the demand curve separation program 17, the demand curve reading unit 11a as means for reading the demand curve data between each line of the three-phase distribution line from the storage means to the control unit 11 of the demand curve separation device 10, The demand curve difference calculation unit 11b as a means for calculating the difference between the demand curves between the lines in the night time zone using the demand curve data between the lines, and the demand difference as a means for calculating the ratio of the night time zone differences. While calculating the difference of the demand curve between each line | wire in the daytime time slot | zone using the ratio calculation part 11c and the demand curve data between each line, the ratio of the difference of the night time slot | zone, the difference of the daytime time slot | zone, and the three-phase distribution line Photovoltaic power generation output calculation unit 1 as a means for calculating a solar power generation output curve between each line in the daytime time zone using the solar power generation equipment capacity ratio between the respective lines And d, the load curve separating portion 11e and is configured as a means for calculating the load curve between each line by using the solar power output curve between demand curve and each line between each line.

  In carrying out the present invention, first, the demand curve reading unit 11a of the control unit 11 reads the demand curve data between the lines from the storage means (S1).

  The demand between each line of the distribution line used in the present invention is measured by, for example, a measurement terminal (referred to as TMU) that remotely collects load information of sensor switches and transformers attached to the distribution line. What is calculated from the data is used.

  Specifically, for example, as shown in FIG. 3, in a three-wire distribution line 1 composed of three phases of A phase, B phase, and C phase, one wire measured by the TMU provided in the pole transformer TR The line current Ibc between the one line is calculated using the active power Pbc and the reactive power Qbc between the lines (between the B phase and C phase in the example shown in FIG. 3). Moreover, each line voltage and line current are calculated using phase voltage Va, Vb, Vc and line current Ia, Ib, Ic of each phase of the distribution line measured by the sensor switch. Then, using the line-to-line current Ibc calculated from the TMU measurement data, the line-current calculated from the sensor switch measurement data is corrected. Based on the correction, each line active power and reactive power are calculated based on each line voltage and line current calculated from the sensor switch measurement data.

  And in this embodiment, the value of the active power according to the time between each line of a distribution line is accumulate | stored in the demand curve database 16a stored in the data server 16 as a memory | storage means. In the following, the database is referred to as DB.

  In the present embodiment, description will be made using an example of active power, that is, a demand curve for each time between lines shown in FIG. Here, the line load of the power distribution system is generally composed of a single-phase load and a three-phase power load, and the proportion of the single-phase load is large in residential areas where the spread of solar power generation is expected. The single-phase load is composed of a base light load, a midnight load such as an electric water heater that starts only at midnight, and a photovoltaic power generation output. The demand curve between each line is the load curve of each component and the solar load. Expressed as the sum of the photovoltaic output curve. FIG. 5 shows a load curve and a photovoltaic power output curve of each constituent element between the lines AB in FIG. 4 (that is, between the A phase and the B phase). It is expressed as PV output curve).

  The demand curve reading unit 11a reads the demand curve data between the lines (that is, the value of the active power at each time for each line) from the demand curve DB 16a stored in the data server 16 as the storage means, and the line type And stored in the memory 15 in association with the time information.

  Next, the demand curve difference calculation part 11b of the control part 11 calculates the difference of the demand curve between the lines in a night time zone (S2).

  As described above, in the present invention, it is assumed that the photovoltaic power generation output curves included between the lines are similar to each other. In the present embodiment, the capacity ratio of the photovoltaic power generation facilities is assumed to be AB between lines: BC between lines: CA between lines = α: β: γ. In addition, the photovoltaic power generation equipment capacity ratio between each line can be grasped as operation management information of the distribution system, and is a known value. In the present embodiment, the values of the photovoltaic power generation equipment capacity ratios α, β, γ between the lines are accumulated in the calculation setting value DB 16b stored in the data server 16 as a storage unit.

  Based on the above, the demand curves Dab, Dbc, Dca for each line AB, BC, CA are respectively expressed by the relational expressions 1-1 to 1-3.

(Equation 1-1) Dab = Lab + αs + Kab + P3
(Equation 1-2) Dbc = Lbc + βs + Kbc + P3
(Equation 1-3) Dca = Lca + γs + Kca + P3
Where L: electric load curve,
s: Solar power generation output calculation unit,
K: Late night load curve,
P3: represents the three-phase power load curve.
The subscripts ab, bc, and ca indicate that they are related to the line AB, BC, and CA, respectively.

  Here, only the lamp load is operating during the time zone before sunset from midnight (for example, from 18:00 to 22:00; hereinafter referred to as the night time zone) when the photovoltaic power generation does not generate power and the midnight load does not operate. Therefore, in the night time zone, the photovoltaic power generation output curve is zero and the midnight load curves Kab, Kbc, Kca are also zero.

  When s = 0 and Kab, Kbc, Kca = 0, two formulas 1-1 to 1-3 are combined, and both sides are subtracted to obtain formulas 2-1 to 2-3. Since the three-phase power load is commonly included between the three lines, the three-phase power load curve P3 is eliminated by drawing both sides (see FIG. 6).

(Equation 2-1) Dbc-Dab = Lbc-Lab
(Equation 2-2) Dbc-Dca = Lbc-Lca
(Equation 2-3) Dca-Dab = Lca-Lab

  Based on the above, the demand curve difference calculation unit 11b performs the data on the night time zone among the data of the demand curves Dab, Dbc, Dca between the lines stored in the memory 15 in the processing of S1 (that is, line-by-line The value of the difference in demand Δ between lines is calculated using Equations 3-1 to 3-3. In addition, the value of the difference Δ of demand between lines in the night time zone is data recorded in the demand curve DB 16a, and is calculated for each time associated with the data stored in the memory 15 in the processing of S1. . Further, the time corresponding to the night time zone is defined in the calculation setting value DB 16b, for example, and the formulas 3-1 to 3-3 are defined in the demand curve separation program 17, for example. Stipulated in the demand curve separation program 17).

(Equation 3-1) Dbc-Dab = Δbc-ab
(Equation 3-2) Dbc-Dca = Δbc-ca
(Equation 3-3) Dca-Dab = Δca-ab

  Then, the demand curve difference calculation unit 11b associates the calculated demand differences Δbc-ab, Δbc-ca, and Δca-ab with the line type and time information of the difference calculation target in the memory 15. Remember.

  Next, the demand difference ratio calculation part 11c of the control part 11 calculates the ratio of the difference in demand between lines in the night time zone (S3).

  Specifically, the demand difference ratio calculation unit 11c reads the value of the demand difference Δ between the lines according to time stored in the memory 15 in the process of S2, and uses Formulas 4-1 to 4-3 to calculate the time. The ratio R of the difference in demand between different lines is calculated.

(Equation 4-1) Rbc = Δbc-ab / Δbc-ca
(Equation 4-2) Rca = Δbc-ca / Δca-ab
(Equation 4-3) Rab = Δca-ab / Δbc-ab

  In addition, the value R of the difference in demand between lines in the night time zone can be calculated for each time associated with the data stored in the memory 15 in the process of S2. Based on the characteristic that the light load curves of the two are similar to each other, the ratio R of the difference in demand between the lines is the same at any time (in other words, the night time according to the types of the ratios Rbc, Rca, Rab) The ratios Rbc, Rca, Rab at any one time of the band may be calculated). However, when the value of the ratio R by time varies due to noise or the like in the measurement of demand on the distribution line, the demand difference ratio calculation unit 11c calculates, for example, the median Md ( Rbc), Md (Rca), Md (Rab) and average values Av (Rbc), Av (Rca), Av (Rab) may be used in the subsequent processing.

  The demand difference ratio calculation unit 11c then calculates the values Rbc, Rca, and Rab of the difference in demand between the lines (or median values Md (Rbc), Md (Rca), Md (Rab), or an average value. Av (Rbc), Av (Rca), Av (Rab)) are stored in the memory 15 in association with the information on the line type of the ratio calculation target.

  Next, the photovoltaic power generation output calculation unit 11d of the control unit 11 calculates a photovoltaic power generation output curve in the daytime (S4).

  First, during the daytime when the photovoltaic power generation generates power (for example, 7 to 17 o'clock; hereinafter referred to as daytime hours), the midnight load is not operating, so the midnight load curves Kab, Kbc, and Kca in the daytime hours. Is zero.

  After setting Kab, Kbc, Kca = 0 and subtracting both sides of two formulas 1-1 to 1-3, formulas 5-1 to 5-3 are obtained.

(Equation 5-1) Dbc-Dab = (Lbc-Lab) + (β-α) s
(Equation 5-2) Dbc-Dca = (Lbc-Lca) + (β-γ) s
(Equation 5-3) Dca-Dab = (Lca-Lab) + (γ-α) s

  Here, the ratios Rbc, Rca, and Rab of the difference in demand between the lines calculated in the process of S3 (or median value Md (Rbc) etc., average value Av (Rbc) etc.) are expressed by Equation 2-1. ~ 2-3, Expressions 3-1 to 3-3, and Expressions 4-1 to 4-3 are understood to represent Expressions 6-1 to 6-3 (see FIG. 6).

(Equation 6-1) Rbc = (Lbc-Lab) / (Lbc-Lca)
(Equation 6-2) Rca = (Lbc−Lca) / (Lca−Lab)
(Equation 6-3) Rab = (Lca−Lab) / (Lbc−Lab)

  Based on the above, the photovoltaic power generation output calculation unit 11d reads the data about the daytime time zone among the data of the demand curves Dab, Dbc, Dca between the lines stored in the memory 15 in the processing of S1, and the formula 5 The values of Dbc-Dab, Dbc-Dca, and Dca-Dab, which are the difference in demand between the lines corresponding to the left sides of −1 to 5-3, are calculated and stored in the memory 15. In addition, the value of the difference in demand between these lines in the daytime time zone is calculated for each time associated with the data stored in the memory 15 in the process of S1. Further, the time corresponding to the daytime time zone is defined in the calculation setting value DB 16b, for example.

  Further, the photovoltaic power generation output calculation unit 11 d reads the values of the photovoltaic power generation equipment capacity ratios α, β, γ from the calculation setting value DB 16 b stored in the data server 16 as the storage unit, and stores the values in the memory 15. Remember.

  Then, the photovoltaic power generation output calculation unit 11d calculates the ratio Rbc, Rca, Rab of the difference in demand between the lines stored in the memory 15 in the process of S3, and the difference Dbc in demand between the above-mentioned lines by time. The value of the photovoltaic power generation output calculation unit s is calculated using the values of Dab, Dbc-Dca, Dca-Dab, the values of the photovoltaic power generation equipment capacity ratios α, β, γ, and Equations 5 and 6. . Specifically, for example, the value of the photovoltaic power generation output calculation unit s is obtained by combining Equations 5-1 and 5-2 with Equation 6-1. Note that the value of the photovoltaic power generation output calculation unit s in the daytime period is calculated for each time associated with the data stored in the memory 15 in the process of S1.

  Further, the photovoltaic power generation output calculation unit 11d calculates the values of the photovoltaic power generation output curves Sab, Sbc, Sca between the lines in the daytime time zone according to the formulas 7-1 to 7-3. Note that the values of the photovoltaic power generation output curves Sab, Sbc, and Sca in the daytime period are calculated as the values of the photovoltaic power generation outputs by time associated with the data stored in the memory 15 in the processing of S1.

(Equation 7-1) Sab = α × s
(Equation 7-2) Sbc = β × s
(Equation 7-3) Sca = γ × s

  Then, the photovoltaic power generation output calculating unit 11d stores the calculated values of the photovoltaic power generation output curves Sab, Sbc, Sca in the memory 15 in association with the line type and time information.

  Next, the demand curve separation part 11e of the control part 11 separates the demand curve between each line into a photovoltaic power generation output curve and a load curve (S5).

  Specifically, the demand curve separation unit 11e performs the data on the demand curves Dab, Dbc, Dca between the lines stored in the memory 15 in the processing of S1 and the daytime time zone stored in the memory 15 in the processing of S4. Using the data of the photovoltaic power generation output curves Sab, Sbc, Sca between the lines, the values of the load curves ΣLab, ΣLbc, ΣLca between the lines are calculated by Equations 8-1 to 8-3. For example, ΣLab = Lab + Kab + P3.

(Equation 8-1) ΣLab = Dab−Sab
(Equation 8-2) ΣLbc = Dbc−Sbc
(Equation 8-3) ΣLca = Dca−Sca

  In addition, since the values of the photovoltaic power generation output curves Sab, Sbc, Sca are zero in the time zones other than the daytime time zone, the demand curves Dab, Dbc, Dca between the lines stored in the memory 15 in the processing of S1. Becomes the values of the load curves ΣLab, ΣLbc, ΣLca as they are.

  Then, the demand curve separation unit 11e calculates the values of the photovoltaic power generation output curves Sab, Sbc, Sca (that is, the values of the photovoltaic power generation output according to the time between lines) and the calculated load curves ΣLab, ΣLbc, ΣLca. The values (that is, the total value of the electric load, the midnight load, and the three-phase power load according to the time according to the line interval) are associated with the line type and time information in the separation calculation result DB 16c stored in the data server 16. Add and record.

  As a result of the above processing, as shown in FIG. 7, the demand curves Dab, Dbc, Dca for each line AB, BC, CA are changed into the photovoltaic power generation output curves Sab, Sbc, Sca and the load curves ΣLab, ΣLbc, ΣLca. Separated (END). In FIG. 7, for example, the photovoltaic power generation output curve of line AB is denoted as line AB_PV, and the load curve of line AB is denoted as line AB_load, for example.

  According to the demand curve separation method, separation device and separation program of the present invention having the above configuration, paying attention to the fact that the operation time of each element constituting the load curve and the photovoltaic power generation is different, the photovoltaic power generation in the distribution system Can be separated into the PV output curve and the load curve, so the PV output and load included in the power flow of the distribution line can be separated. The actual situation can be grasped, and it becomes possible to appropriately carry out facility planning, operation management and power quality maintenance of distribution lines.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the various DBs 16a to 16c are stored in the data server 16 as a storage unit. However, the present invention is not limited to this, and may be stored in the storage unit 12 as a storage unit.

  Moreover, in the above-described embodiment, the daytime time zone is set at 7 o'clock to 17:00, but the daytime time zone is a time zone when solar power generation generates power and the midnight load is not operating. For example, the operator may set another time zone based on the actual situation of the power distribution system. Furthermore, although the night time zone is set to 18:00 to 22:00, if the night time zone is a time zone where solar power generation does not generate power and the midnight load is not operated, that is, only the lamp load is operated, It is not restricted to a time zone, For example, an operator may set another time zone based on the actual situation of a power distribution system.

  Furthermore, in the above-mentioned embodiment, what is calculated using the sensor switch measurement data and the TMU measurement data is used as the demand between each line of the distribution line, but each line of the distribution line used in the present invention. The demand in between is not limited to that obtained by the method described in the present embodiment as long as it is a value of active power for each time between distribution lines.

  The demand curve separation method, separation device, and separation program of the present invention can be used, for example, when performing distribution line system switching and distribution line system switching at the time of distribution line accidents, and when planning distribution line reinforcement construction and supply construction. It is necessary to know the supply capacity of the distribution line (= distribution line supply capacity-load). On the other hand, when the spread of photovoltaic power generation has advanced, the photovoltaic power generation output will cancel the load. Even if there is a possibility to overestimate the distribution line and determine whether countermeasures are necessary or not, it is actually possible even if solar power generation is widely spread by separating the load and solar power output Therefore, it is possible to appropriately perform system switching and facility planning of distribution lines, and the utility value is high in these fields.

DESCRIPTION OF SYMBOLS 10 Demand curve separation apparatus 11 Control part 12 Storage part 13 Input part 14 Display part 15 Memory 16 Data server 17 Demand curve separation program

Claims (3)

  A step of calculating a difference in demand curve between the lines in the night time zone of the three-phase distribution line, a step of calculating a ratio of the difference in the night time zone, and a demand curve between the lines in the day time zone of the three-phase distribution line Calculating the difference, and using the difference in the nighttime zone, the difference in the daytime zone, and the solar power generation equipment capacity ratio between the lines of the three-phase distribution line, the sun between each line in the daytime zone A demand curve separation comprising: calculating a photovoltaic power output curve; and calculating a load curve between the lines using the demand curve between the lines and the photovoltaic power output curve between the lines. Method.   Means for reading demand curve data between each line of a three-phase distribution line from storage means; means for calculating a difference between demand curves between each line in the night time zone using the demand curve data between each line; and the night time Means for calculating the ratio of the difference between the bands, means for calculating the difference in the demand curve between the lines in the daytime time zone using the demand curve data between the lines, the ratio of the difference in the nighttime period and the daytime Means for calculating a photovoltaic power generation output curve between each line in the daytime time zone using a difference in time zone and a photovoltaic power generation capacity ratio between each line of the three-phase distribution line, a demand curve between the lines, and the And a means for calculating a load curve between the lines using a photovoltaic power generation output curve between the lines.   Means for reading demand curve data between each line of a three-phase distribution line from storage means, means for calculating a difference between demand curves between each line in the night time zone using the demand curve data between each line, Means for calculating a ratio of differences, means for calculating a difference in demand curve between each line in daytime time zone using data of demand curve between each line, ratio of difference in said night time period and difference in said daytime time period And means for calculating a photovoltaic power generation output curve between the lines in the daytime time zone using the solar power generation capacity ratio between the lines of the three-phase distribution line, the demand curve between the lines and the sunlight between the lines A demand curve separation program for causing a computer to function as a means for calculating a load curve between lines using a power generation output curve.