JP2018014774A - System optimization calculation device and system optimization calculation method of power distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system optimization calculation device and a system optimization calculation method of a power distribution system for calculating an optimum system configuration, by combining tap change of pole transformers, optimum setting of a voltage regulator, and optimum arrangement.SOLUTION: A system optimization calculation device of a power distribution system for finding an optimum system configuration of a power distribution system including multiple pole transformers with taps on a power distribution line, includes first means for finding a first average value of low voltages of individual pole transformers with taps in a prescribed time zone, by load-flow calculation of the power distribution system, and a second average value of low voltages of multiple pole transformers with taps in a prescribed time zone, second means for changing the tap value so that the first average value approaches the second average value, for the pole transformers with taps, and third means for executing tap value change processing until predetermined conditions are satisfied for tap value change.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a system optimization calculation device and a system optimization calculation method for a distribution system, and in particular, a distribution system capable of maintaining a voltage and improving operational efficiency by operating a plurality of voltage regulators in cooperation with self-end information. The present invention relates to a system optimization calculation apparatus and a system optimization calculation method.

  The voltage of the distribution system can be selected by switching the transformer (load ratio control transformer LRT: Load Ratio Transformer) installed in the distribution substation or the automatic voltage regulator (SVR: Step Voltage) installed on the distribution line. It is controlled by tap switching such as Regulator, TVR (Thyristor Voltage Regulator).

  These voltage regulators (load-tap switching transformer LRT and automatic voltage regulators SVR and TVR) are based on the reference voltage and line voltage drop compensator LDC (Line Drop Compensator). By appropriately setting the settling values of the switching transformer LRT and the automatic voltage regulators SVR and TVR secondary side voltage), the appropriate voltage is maintained by the tap control. In order to avoid excessive capital investment when installing the voltage regulators, it is desirable that the automatic voltage regulators SVR and TVR installed on the distribution lines are appropriately arranged to reduce the number of installed units as much as possible.

  On the other hand, the voltage management voltage in the distribution system in Japan is obliged to be within the proper range of 101 ± 6V at low voltage by the Electricity Business Law. Electric power used in a general home is converted from a 6600 kV system voltage to a 100 V system using a pole transformer. The transformation ratio that changes depending on the tap value of the pole transformer is generally 105/6750, 105/6600, 105/6450, etc., and the low voltage changes by about 2.5V by changing the tap value by one stage. Therefore, proper setting of the pole transformer tap value is also important in order to keep the low voltage within the appropriate range.

  The following methods are known for the optimum arrangement method and optimum set value calculation method of the voltage regulator (load tap change transformer LRT and automatic voltage regulator SVR and TVR). Patent Document 1 discloses an optimum arrangement method of an automatic voltage regulator that uses particle swarm optimization (PSO) to minimize installation cost. Patent Document 2 discloses a method for determining a setting parameter of an automatic voltage regulator by performing multiple regression analysis on the correlation between the ideal value Vs of the voltage regulator and the measured value of the electric quantity of the distribution system. Yes.

JP 2008-31323 A JP 2010-220283 A

  In the method described in Patent Document 1, it is possible to optimally arrange the voltage regulator, but here, the examination combined with the change of the pole transformer tap is not assumed. For this reason, in a system in which the number of installed voltage regulators can be reduced by changing the pole transformer taps, there may be a case where the optimum arrangement with the minimum number of installed voltage regulators cannot be realized. Moreover, the method of patent document 1 is a method of maintaining an appropriate voltage by calculating the optimal tap position of a voltage regulator, and does not show a method for calculating a set value to be set in a field device in actual operation. .

  In the method described in Patent Document 2, it is possible to calculate an optimal settling value for a system in which the arrangement of the voltage regulator is determined. However, the optimum arrangement and the optimal setting are considered in combination. It is difficult. This method is a very useful method for calculating the set value of the on-load tap switching transformer LRT, in which it is difficult to determine the point where the voltage regulator tries to keep the voltage constant (load center point). The automatic voltage regulators SVR and TVR, which are relatively easy to determine the center point, can calculate the optimum settling value with high accuracy without applying the settling value calculation by multiple regression analysis. In addition, since the calculation is performed in three dimensions by multiple regression analysis, it is not easy for the operator to confirm the calculation result of the optimum set value on the graph.

  As described above, in the distribution system in which the optimum arrangement of the automatic voltage regulators SVR and TVR is changed by changing the tap of the pole transformer, the optimum arrangement method of the automatic voltage regulators SVR and TVR in consideration of the tap change of the pole transformer. Has not been established, and remains a difficult problem for practitioners who are in charge of building the distribution system.

  From the above, in the present invention, the operator can confirm the validity of the calculation result on the two-dimensional graph, and the tap change of the pole transformer and the optimum set values of the automatic voltage regulators SVR and TVR are determined. It is an object of the present invention to provide a system optimization calculation device and a system optimization method for a distribution system for calculation.

  Further, in the embodiment of the present invention, a system optimization calculation device and system optimization for a distribution system that calculates an optimal system configuration by combining tap change of a pole transformer and optimal setting value and optimal arrangement of a voltage regulator The purpose is to provide a calculation method.

  From the above, in the present invention, a distribution system system optimization calculation device for obtaining an optimal system configuration of a distribution system having a plurality of tapped pole transformers on a distribution line, and by calculating the power flow of the distribution system The first average value for the low voltage of each tapped pole transformer in a predetermined time zone and the second average value for the low voltage of a plurality of tapped pole transformers in the predetermined time zone are obtained. The first means, the second means for changing the tap value so that the first average value approaches the second average value, and the predetermined condition for the tap value change for the pole-mounted transformer with a tap The third means for executing the tap value changing process is provided.

  The present invention is also a system optimization calculation method for a distribution system for obtaining an optimal system configuration of a distribution system having a plurality of tapped pole transformers on a distribution line. Measurement database that stores measured values of power, system configuration data necessary for power flow calculation of distribution system, power flow calculation database that stores calculation results of power flow calculation and state estimation calculation, voltage regulator reference voltage and LDC settling value Control device setting database to store, Voltage regulator ideal voltage database to store calculation result of ideal value of voltage regulator output voltage at each time, Control device arrangement database to store optimum arrangement of voltage regulator, pole transformer tap Based on the tidal current calculation results and state estimation results using the information stored in the pole transformer tap database that stores the change results, the optimum of the pole transformer Calculate the ideal value of the voltage regulator's transmission voltage, calculate the location where the voltage regulator is required and the necessity of the existing voltage regulator, and reach the voltage at each node when the ideal voltage is used The settling parameters of the voltage regulator are calculated based on

  ADVANTAGE OF THE INVENTION According to this invention, the optimal system | strain structure can be calculated combining the tap change of a pole transformer, and the optimal setting value and optimal arrangement | positioning of a voltage regulator.

  Further, according to a preferred embodiment of the present invention, it is possible to calculate the optimum arrangement of the automatic voltage regulators SVR and TVR even in a system that performs tap change of the pole transformer.

  In addition, according to a preferred embodiment of the present invention, it is possible to calculate the optimum set value simultaneously with calculating the optimum arrangement of the automatic voltage regulators SVR and TVR.

  Further, according to a preferred embodiment of the present invention, it is possible to confirm the validity of the optimum settling value calculation result on the two-dimensional graph with respect to the tidal current calculation result of a plurality of cross sections over three sections.

  Other objects and features of the present invention will be clarified in the embodiments described below.

The figure which shows the example of the typical power distribution system which can apply the system optimization calculation apparatus which concerns on this invention. The figure which shows the hardware constitutions of the system | strain optimization calculation apparatus 10 which concerns on Example 1 of this invention. The flowchart which shows the pole transformer tap value, the optimal arrangement | positioning of a voltage regulator, and the optimal settling value calculation algorithm in the case where the existing voltage regulator is not considered. The figure which showed the voltage in each point on a distribution line starting from the substation exit end. The figure which shows the voltage distribution example which shows substantially constant as an example of the high voltage distribution on a distribution line. The figure which shows the low voltage example of the pole transformer at the time of FIG. 5a. The figure which shows the example of the low voltage of a pole transformer as a result of adjusting the tap of a pole transformer with a big gap. The figure which shows the voltage distribution example when receiving the result of the improved low voltage distribution, and adjusting the voltage by SVR of the substation exit end. The figure which shows the view for specifying the utility pole from which the low voltage conversion voltage has deviated from other utility poles. The figure which shows the example where the point which has recorded the maximum voltage Vamax is closer to SVR. The figure which shows the example where the point which has recorded the minimum voltage Vamin is closer to SVR. The figure which shows the example of distribution of the low voltage in the system | strain in which a voltage deviation does not occur. The figure which shows the state with the same margin of the low voltage and upper and lower limit voltage in a pole transformer installation point. The figure which shows the state by the side of a high voltage. The figure which shows the concept of the load center point calculated | required by Example 1 of this invention. The flowchart which shows the pole transformer tap value by the necessity determination of the existing voltage regulator which concerns on Example 2 of this invention, the optimal arrangement | positioning of a voltage regulator, and the optimal settling value calculation algorithm. The figure which shows the example which can remove the voltage regulator SVR2 on a distribution line. The figure which shows the case where the voltage regulator SVR2 on a distribution line cannot be removed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an example of a typical power distribution system to which the system optimization calculation apparatus according to the present invention can be applied.

  1, the distribution system 100 includes a distribution substation 110, a node (bus) 120, a distribution line 140 connecting them, a load 150 connected to the node 120, a generator 130, a sensor 170 installed in the distribution line, and the like. It is configured. In the power distribution system 100, an SVR 300 as an example of a voltage regulator is installed in series with the power distribution line 140 of the power distribution system 100, and the tap position is controlled by the tap control device 310.

  The sensor 170 measures line current, flow power factor, active power P, reactive power Q, node voltage V, and the like, and sends information to the system optimization calculation device 10 via the communication terminal station 180 and the communication network 190. The system optimization calculation apparatus 10 sends a control signal to the tap control apparatus 310 in the SVR 300 that is a voltage regulator via the communication network 190 and the communication terminal station 180, and appropriately controls the tap position.

  FIG. 2 shows a hardware configuration of the system optimization calculation apparatus 10 according to the embodiment of the present invention. The system optimization calculation device 10 is configured by a so-called computer system, and shows a main functional configuration in that case.

  The system optimization calculation device 10 is configured by connecting a display device 11, an input unit 12 such as a keyboard and a mouse, a computer (CPU) 13, a communication unit 14, a RAM 15, and a memory 31 to a bus line 30. Among these, the computer (CPU) 13 executes a calculation program to instruct image data to be displayed, search for data in various databases, and the like. The RAM 15 includes calculation result data such as display image data, power flow calculation results, measurement data list, settling parameter calculation results, voltage regulator ideal voltage calculation results and pole transformer tap change results, and voltage regulator optimum arrangement calculation results. Is a memory for temporarily storing. Based on these data, the CPU 13 generates necessary image data and displays it on the display device 11 (for example, a display screen).

  Various databases DB are configured in the memory 31, and these are a measurement data database DB1, a power flow calculation data database DB2, a controller settling data database DB3, a voltage regulator ideal voltage data database DB4, a control for storing various data. A device arrangement data database DB5 and a pole transformer tap data database DB6 are provided, and in addition, a program data database DB7 for storing a program executed by the computer (CPU) 13 is provided.

  Among these, the power flow calculation data database DB1 stores line constant Z (= R + jX) indicating the impedance of the line 140, load / power generation amount, system line and voltage regulator, and system configuration data representing the connection status of nodes. ing. In addition to this, information such as line current, current power factor, active power P, reactive power Q, load, power generation amount, and node voltage V obtained by power flow calculation and state estimation calculation is also stored. . These data will be referred to as system data.

  In the measurement data database DB2, information such as the current, current power factor, active power P, reactive power Q, load and power generation amount, and node voltage V of each time section measured by the sensor 170 in the distribution system 100 is stored. Is stored. These data are transmitted via the communication network 190 and the communication means 14 of the system optimization calculation device 10. These data measured by the sensor 170 will be referred to as measurement data.

  The control device settling data database DB3 stores reference voltages as calculation results, R and X as settling parameter values for LDC, and the like. The voltage regulator ideal voltage data database DB4 stores the calculation result of the ideal value of the voltage regulator output voltage at each time. The control device arrangement data database DB5 stores the optimum arrangement of the voltage regulator as a calculation result. The pole transformer tap data database DB6 stores a pole transformer tap change result as a calculation result.

  The program data database DB7 stores a power flow calculation program Pr1, a state estimation calculation program Pr2, an optimal settling value calculation program Pr3, a pole transformer tap change program Pr4, and an optimal arrangement calculation program Pr5, which are calculation programs. These programs Pr are read by the CPU 13 as necessary, and calculation is executed.

  FIG. 3 is a flowchart showing a calculation algorithm for pole transformer tap values, optimum arrangement of voltage regulators, and optimum settling values in a case where an existing voltage regulator is not taken into consideration. The calculation processing contents of the system optimization calculation apparatus 10 shown in this figure will be described. The figure shows an example of a procedure for determining the pole transformer tap value and the optimum set value of the voltage regulator based on the voltage measurement data of the sensors in the distribution system and the power flow calculation results at each time. Hereinafter, the flow of processing will be described.

  FIG. 3 mainly includes two processing contents. One of them is a countermeasure (processing steps S1 to S3 in FIG. 3) by adjusting the taps of the pole transformers provided in the power distribution system 100. Secondly, when the tap adjustment of the pole transformer is not sufficient, it is necessary to install a new voltage regulator, and a countermeasure for identifying the installation location (FIG. 3). Are processing steps S4 to S11).

  In the first processing step S1 in the flowchart of FIG. 3, data necessary for processing is read, a period to be analyzed is determined (for example, the user may specify the past one week, etc.), and each time of the target period Using the measurement data and system data in the distribution system necessary for performing the power flow calculation for, perform the power flow calculation for multiple time sections in the case where no voltage regulator is installed in the power distribution system. In the tidal current calculation here, the tidal current calculation program Pr1 and the state estimation calculation program Pr2 in FIG. 2 are used. If the voltage drop is large and the calculation does not converge, it is better to converge the calculation by temporarily installing a voltage regulator at a point where a voltage drop of about 600 V occurs.

  The result of the power flow calculation is obtained, for example, as a voltage value at each point on each distribution line 140 starting from the substation exit end. FIG. 4 is an example of the obtained voltage distribution. The vertical axis indicates the high voltage on the distribution line 140, and the horizontal axis indicates the length (km) from the substation outlet end of the distribution line 140. Generally, the high voltage shows a tendency of voltage distribution examples LD1 and LD2 that decrease as the distance from the substation exit end increases due to a voltage drop in the distribution line. However, in recent years, with the widespread use of photovoltaic power generation, voltage distribution example LU1 in which the terminal voltage becomes higher due to the ferrant phenomenon that occurs due to the influence of a capacitor provided together with a high voltage load during the daytime when the photovoltaic power generation generates, or at night or on holidays. , LU2 may show a tendency. It is assumed that a voltage regulator is installed at the substation exit end.

  On the other hand, the low voltage determined by the pole transformer provided in various places on the distribution line 140 is determined by the tap value of the pole transformer. FIG. 5a illustrates a voltage variation LU2 that is substantially constant among the voltage distribution examples of the high voltage on the distribution line 140 illustrated in FIG. FIG. 5b illustrates the distribution of the low voltage of the pole transformer at this time. In general, pole transformers provided in various places on the distribution line 140 employ a tap value that is smaller as it reaches the end. In the illustrated example of FIG. 5a, pole transformers are installed at the utility pole positions PT1 and PT2 in the long length, 6750 taps at the substation exit end side from PT1, 6600 taps between PT1 and PT2, and PT2 at the latter stage. An example with 6450 taps is shown. Thereby, the transformation ratio in each section becomes 105/6750, 105/6600, and 105/6450, respectively, and even if the high voltage is constant (FIG. 5a), the low voltage rises as the distribution line ends. (FIG. 5b) It can be seen that the trend is shown.

  The voltage management voltage in the Japanese distribution system is obliged to be within the proper range of 101 ± 6V at low voltage by the Electricity Business Act, and the low voltage of the pole transformer shown in FIG. 5b is the upper limit voltage Vu (107V). When the range of the lower limit voltage Vl (95 V) is exceeded, transition control to within the range is performed.

  Next, in the process step S2, based on the voltage analysis result of the cross section for a plurality of time, the low-voltage conversion voltage of each node is calculated using the pole transformer tap, and the average value Va is calculated. For example, in the example of the pole transformer shown in FIG. 5b, for each pole transformer installation point shown in PT1 and PT2 in the long length, the low voltage there is, for example, an average value Va in one hour unit. , Which means obtaining for 24 hours. Here, for the time being, description will be made by taking as an example the average value Va of the low voltage obtained in the time zone of 1 hour from 9:00 to 10:00. At this time, the average value Va of the low voltage at each point on the length is as shown in FIG. 5b.

  Next, in process step S3, the maximum voltage Vamax and the minimum voltage Vamin are extracted from the average value Va of the low-voltage converted voltage. In the example shown in FIG. 5b, the minimum voltage Vamin is observed in the vicinity of the substation exit end, and the maximum voltage Vamax is observed on the end side of PT2 over the long length. In the illustrated example, the difference Vd (Vamax−Vamin) between the maximum voltage Vamax and the minimum voltage Vamin of the low-voltage converted voltage is larger than the difference (Vu−Vl) between the upper limit value VLu and the lower limit value Vl. In this state, no matter how the SVR output voltage, which is a voltage regulator installed at the substation outlet end, is adjusted, voltage deviation occurs at any location on the distribution line. Therefore, in the present invention, it is confirmed whether or not the deviation can be eliminated by appropriately setting the pole transformer tap.

  At this time, in order to minimize the number of pole transformers whose taps are to be changed, in the section where each voltage regulator is in charge of voltage management, on the pole pole where the low voltage equivalent voltage is different from other poles. It is desirable to preferentially change the transformer tap. A utility pole for which a pole transformer tap is not appropriate always tends to have a higher or lower low-voltage equivalent voltage than other utility poles.

Therefore, in processing step S3, the overall average voltage Vb of the low-voltage converted voltage in the entire voltage management section is calculated from the time-series data of the low-voltage converted voltage, and the difference ΔVgap between the average voltage Va and the overall average voltage Vb at each node is (1). ).
[Equation 1]
ΔVgap = Va−Vb (1)
FIG. 6 is a diagram illustrating a concept for specifying a utility pole in which a low-voltage converted voltage is deviated from other utility poles. In FIG. 6, ● represents the average voltage Va measured by the pole transformer on each power pole, and in the example of FIG. 6, the average voltage Va measured by eight pole transformers is shown. Vb is an overall average voltage of eight low-voltage converted voltages in the entire voltage management section. The pole transformer tap at the pole position where the difference ΔVgap from the overall average Vb shows a significant average voltage Va is a pole transformer tap that is preferably controlled with priority. In the illustrated example, Va1 is most dissociated.

  Specifically, in the processing step S3, the absolute value of ΔVgap is calculated as the degree of divergence | ΔVgap |, and is preferentially selected from the pole transformer of the utility pole (in this case, the pole transformer indicating Va1) having the maximum | ΔVgap |. Change the pole transformer tap to Regarding the tap value after the change, when ΔVgap is larger than 0, that is, higher than the average voltage in the section, the tap is increased, and when ΔVgap is smaller than 0, that is, lower than the average voltage in the section, the tap is decreased. Change to

  When the difference (Vamax−Vamin) between the maximum voltage Vamax and the minimum voltage Vamin of the low-voltage converted voltage in the voltage management range is Vd, Vd is reduced by changing the pole transformer tap in the above direction. The change of the pole transformer tap is terminated when Vd becomes smaller than the target value Vd 'or the pole transformer tap change number reaches the preset upper limit number. The target value Vd ′ is set to a value smaller than the difference between the upper limit value and the lower limit value. If Vd is larger than Vd ′ even if the number of pole transformer tap changes reaches the upper limit, voltage deviation cannot be resolved even if the pole transformer tap is changed. Therefore, since a new voltage regulator needs to be installed, the process proceeds to processing step S4.

  Thus, as the difference ΔVgap between the average voltage Va and the overall average voltage Vb is larger, the pole transformer tap of the entire distribution system is adjusted so that the tap value becomes smaller. In the above example, the processing is performed using the average value Va of the low voltage obtained in the time zone of 1 hour from 9 o'clock to 10 o'clock. In the end, the combination of pole transformer taps in which the low voltage does not deviate from the upper and lower limit values in as many time zones as possible will be sought. In addition, when the optimal tap value is calculated | required in this way, an operator will go to the utility pole which has mounted the said pole transformer, and will adjust a tap value separately.

  As a result of the processing up to processing step S3, a command is output from the system optimization calculation device 10 to the operation supervisor. For example, when a predetermined condition for changing the tap value is satisfied, an execution command for the tap change operation is output for the tapped pole transformer on the distribution line that is to change the tap value. When a predetermined condition for changing the tap value is not satisfied, a new voltage regulator installation command is output on the distribution line.

  FIG. 5c shows an example of the low voltage of the pole transformer as a result of adjusting the tap of the pole transformer having a large deviation as described above. In FIG. 5c, as a result of changing the tap value at the pole transformer position PT2 where ΔVgap is greater than 0, that is, higher than the average voltage in the section, from the previous 6450 tap to 6600 tap, The result shows that the low-voltage voltage downstream of the position PT2 of the container does not exceed the upper limit value Vu and falls within the predetermined control range.

  Furthermore, FIG. 5d shows an example of the voltage distribution when the voltage is adjusted by the voltage regulator at the substation outlet end in response to the result of the improved low voltage distribution in FIG. 5c. In the state of FIG. 5b, the voltage adjustment by the voltage regulator at the substation outlet end cannot function effectively for the purpose of keeping it within the predetermined range, but it can be kept within the predetermined range including the low voltage side.

  If the combination of pole transformer taps in which the low-voltage voltage does not deviate from the upper and lower limit values is determined in any daytime and nighttime by the above processing steps S1 to S3, the subsequent processing is not required, but is not determined. In such a case, the installation location of the SVR that is a voltage regulator newly installed on the distribution line is determined as follows.

  In the first process step S4 in the process of determining the installation location of the voltage regulator newly installed on the distribution line, the ideal voltage Vs of the voltage regulator is calculated. When the difference Vd (Vamax−Vamin) between the maximum voltage Vamax and the minimum voltage Vamin of the low-voltage converted voltage in the voltage management range is larger than the target value Vd ′, a voltage deviation occurs. It is desirable to minimize the number of installed voltage regulators by keeping the voltage within an appropriate range as far as possible to the terminal pole. For that purpose, it is necessary to calculate the voltage regulator secondary side voltage ideal value Vs depending on which of the points where the maximum voltage Vamax and the minimum voltage Vamin are recorded is closer to the voltage regulator installed on the power supply side. There is.

  FIG. 7a shows an example of a low voltage distribution near the power source where the maximum voltage Vamax is recorded, and FIG. 7b shows an example of a low voltage distribution near the power source where the minimum voltage Vamin is recorded. is there. In the case of FIG. 7a, it is necessary to newly install a voltage regulator on the power supply side from the point where the low voltage becomes lower than the lower limit voltage Vl. In the case of FIG. 7b, the low voltage becomes higher than the upper limit voltage Vu. A voltage regulator needs to be newly installed on the power supply side of the site.

In the case of FIG. 7a where the point where the maximum voltage Vamax is recorded is closer to the voltage regulator, the secondary voltage of the voltage regulator is set higher (so Vamax = Vu) within a range where the maximum voltage Vamax does not deviate from the upper limit. ), And a voltage regulator is added to the point Pl that has become the lower limit. The example in FIG. 7A illustrates the voltage distribution in a state where Vamax = Vu. Specifically, the ideal voltage Vs and the correction amount ΔV are calculated by the following equations (2) and (3).
[Equation 2]
Vs = V + {(Vu × Tpmax / 105) −Vamax} (2)
[Equation 3]
ΔV = (Vu × Tpmax / 105) −Vamax (3)
Where V is the secondary voltage of the current voltage regulator (voltage regulator installed at the substation outlet end), Vu is the upper limit of the low voltage, Vamax is the maximum voltage of the low voltage, and Tpmax is the maximum of the low voltage. This is the pole transformer tap value of the node at which the voltage Vamax is obtained.

On the other hand, in the case of FIG. 7b where the point where the minimum voltage Vamin is recorded is closer to the voltage regulator, the secondary side voltage of the voltage regulator is set to be lower within the range where the minimum voltage Vamin does not deviate from the lower limit (accordingly, Vamin = Vl), and a voltage regulator is added at the point where the upper limit is deviated. The example in FIG. 7b illustrates the voltage distribution in a state where Vamin = Vl. The ideal voltage Vs and the correction amount ΔV are specifically calculated by the following equations (4) and (5).
[Equation 4]
Vs = V + {(Vl × Tpmin / 105) −Vamin} (4)
[Equation 5]
ΔV = (Vl × Tpmin / 105) −Vamin (5)
Here, Vl is a lower limit value of the low voltage, Vamin is a minimum voltage of the low voltage, and Tpmin is a pole transformer tap value of the node that becomes the minimum voltage Vamin of the low voltage.

  Next, in processing step S5, in order to calculate the voltage when the voltage regulator secondary side voltage (secondary side voltage of the voltage regulator installed at the substation outlet end) is an ideal voltage, The ultimate voltage based on the voltage calculation result of each node is corrected by ΔV. When the corrected voltage is overlapped over the entire cross section of 24 hours, the utility pole where the voltage deviation occurs can be confirmed even as the ideal voltage. Among the nodes where the voltage deviation occurs, a voltage regulator is added at the point closest to the power source.

  For example, in the low voltage distribution example of FIG. 7a which means the characteristic of night operation, the point Pl is recommended as an additional installation point of the voltage regulator, and also means the characteristic of daytime operation using solar power generation. In the low voltage distribution example, if the point Pl is recommended as an additional installation point of the voltage regulator, the node on the most power source side among the nodes where the voltage deviation overlapped in the full time section of 24 hours occurs. A voltage regulator is additionally installed at a point Pl in FIG. 7a.

  Next, in the processing step S6, the processing steps S2 to S5 are repeated for the added voltage regulator in the same manner to change the tap, calculate the ideal voltage Vs and the correction amount ΔV, correct the analysis result, and correct the voltage regulator. Conduct additional studies and change pole transformer taps and add voltage regulators until voltage deviation at the end of the grid is resolved. In this case, the position of the added voltage regulator is regarded as the substation outlet end, and the voltage distribution on the rear stage side is reexamined. After that, if the system configuration eliminates voltage deviation, consider whether the voltage regulators installed at the branch destinations can be consolidated before branching, and minimize the number of units as much as possible, and need voltage regulators. Determine the number. The arrangement at this time is recorded as the optimum arrangement. Since the number of installed voltage regulators can be minimized up to the processing step S6, the voltage margin can be maximized by making the best use of each voltage regulator.

  Next, in processing step S7, it is examined whether or not the case where the voltage regulator cannot be effectively used is applicable. Therefore, specifically, the upper and lower limit values Vu and Vl of the low voltage are narrowed, and the processing steps S1 to S6 are performed.

  Here, the case where the voltage regulator cannot be used effectively is a case where the voltage margin within the voltage management target range varies for each voltage regulator connected in series from the power source side. In particular, since the voltage regulator installed near the terminal has a narrow voltage management target range, it is assumed that the voltage margin is larger than other voltage regulators. To solve this, suppose the same condition as when all the voltage regulators were removed by narrowing the upper and lower limit values, and then the optimum placement was examined again from here, and the voltage margin of the voltage regulator with the smaller voltage margin was increased. Consider increasing it.

  According to this method, the condition becomes severe by narrowing the upper and lower limits, and the installation position of the voltage regulator moves to the power supply side. After calculating the installation positions of the voltage regulators, the voltage regulators at the branch destinations are aggregated to minimize the number of installed voltage regulators and determine the number of installed voltage regulators. At this time, if the required number of voltage regulators obtained in process step S6 is not exceeded, the voltage margin can be expanded while minimizing the number of installed voltage regulators, so the optimum arrangement of voltage regulators is updated. As the upper and lower limit values are narrowed, the number of installed voltage regulators exceeds the previously required number, so the arrangement when the upper and lower limit values are narrowed the most within the range that does not exceed the required number is the optimum arrangement.

  Until the process step S7, the number of voltage regulators installed can be minimized and the voltage margin can be maximized by using each voltage regulator to the maximum. Therefore, the optimum set value of each voltage regulator for this system configuration is obtained.

  Next, the ideal voltage of each voltage regulator is calculated in processing step S8. Unlike the case where the ideal voltage here is obtained in the processing step S4, the ideal voltage is for a system in which no voltage deviation occurs, and therefore, a transmission voltage with the maximum voltage margin is obtained.

  The concept of the processing here will be described with reference to FIGS. 8a, 8b, and 8c. First, FIG. 8a shows an example of low voltage distribution in a system in which no voltage deviation occurs. The secondary side voltage of the voltage regulator SVR shows an example of a voltage distribution that shows a decreasing tendency, and the tap of the pole transformer is changed from 6750 taps to 6600 taps on the way, and the voltage in the subsequent stage is increased. . However, at any point, the low voltage is within the range of the upper and lower limit voltages Vu and Vl. The secondary voltage of the voltage regulator SVR is a voltage V sent from the voltage regulator at the time of analysis. At this time, it is assumed that the difference between the low voltage at the pole transformer installation point and the upper and lower limit voltages Vu and Vl is Vdu and Vdl, respectively. This relationship is Vdu <Vdl, and it can be clearly understood that the lower limit side has a large margin and the upper limit side has a small margin.

  FIG. 8 b shows the difference between the low voltage and the upper and lower limit voltages Vu and Vl at the pole transformer installation point, where Vdu = Vdl, and shows the same margin for the upper and lower limits. The output voltage of the voltage regulator that realizes such a state is referred to as an ideal voltage Vs. FIG. 8c shows a state on the high voltage side.

Hereinafter, a specific method for realizing the relationship of FIG. 8B will be described in consideration of the number of taps. In process step S8, the ideal voltage Vs is calculated using the following equations (6), (7), and (8). Here, the ideal voltage Vs means that the maximum voltage Vamax and the minimum voltage Vamin of the low-voltage converted voltage are extracted from all the power poles in the voltage management target range, and the voltage margin with respect to the upper limit value Vu and the lower limit value Vl becomes equal. Is a sending voltage that maximizes the voltage margin to the upper and lower limits.
[Equation 6]
Vs = V + (Vdu−Vdl) / 2 (6)
[Equation 7]
Vdu = (Vu × Tpa / 105) −Va (7)
[Equation 8]
Vdl = Vb− (Vl × Tpb / 105) (8)
Here, Vs is an ideal voltage of the voltage regulator, V is a voltage regulator output voltage at the time of analysis, Vdu is a voltage margin with respect to the upper limit, Vdl is a voltage margin with respect to the lower limit, Vu is an upper limit value at a low voltage, and Va is voltage management. The high voltage of the utility pole a having the maximum low voltage converted voltage within the target range, Tpa is the pole transformer tap value of the utility pole a, Vl is the lower limit value at low voltage, and Vb is the low voltage converted voltage within the voltage management target range. Is the high voltage of the utility pole b where the minimum voltage is, Tpb is the pole transformer tap value of the utility pole b.

At this time, the voltage correction amount ΔV with respect to the ideal voltage Vs is calculated by the following equation.
[Equation 9]
ΔV = Vs−V = (Vdu−Vdl) / 2 (9)
Next, in process step S9, the ultimate voltage based on the voltage calculation result of each utility pole in each time section is corrected by ΔV, and the ultimate voltage at each node when the voltage margin to the upper and lower limits is maximized is calculated. Since this study uses time-series voltage analysis results, when there are n-case voltage analysis results, processing is performed to correct the correction amount ΔV for n cases and the voltage reached by analysis of each power pole by ΔV.

  Although the voltage margin has been maximized in the above processing, the voltage drop compensation function in the distribution line is further realized in the next stage. For example, the voltage regulator at the substation outlet end performs constant secondary voltage control, and the secondary voltage in this case is the voltage at the virtual point (load center point) in the distribution line. In processing steps S10 and S11, a voltage drop compensation function in the distribution line is realized.

  For this reason, in the processing step S10, first, in the voltage curve of the multi-time section when the voltage regulator secondary side voltage is the ideal voltage, a node having a small change in the reached voltage is obtained throughout the entire time zone. Specifically, the maximum value and the minimum value of the reached voltage are extracted for each node, and the difference is calculated.

  Here, assuming that the load center point is the point where the impedance from the voltage regulator is R and the reactance is X in the actual system, the voltage regulator uses the impedance R and reactance X set by the LDC setting value to virtually Simulate the distribution line and calculate the voltage drop from the active / reactive power passing through the voltage regulator to the load center point. Appropriate voltage adjustment is realized by changing the tap value of the voltage regulator based on the assumed voltage drop amount so that the voltage reached at the load center point becomes the set reference voltage.

  In this case, the node where the difference between the maximum value and minimum value of the ultimate voltage is small should be the load center point, and the impedance and reactance from the voltage regulator to the load center point should be calculated from the ultimate voltage. However, it is necessary to extract the load center point from a point where the difference between the passing active power and reactive power of the voltage regulator is small. When the load center point is extracted from the branch line, there is a possibility that the passing active power and the reactive power greatly change between the voltage regulator and the load center point. The voltage drop amount assumed by the voltage regulator is a voltage drop amount when the passing active power / reactive power of the voltage regulator flows to the load center point. Therefore, when the active power / reactive power decreases between the load and the center point, the assumed voltage drop amount deviates from the actual voltage drop amount, and the voltage may deteriorate due to the tap operation of the voltage regulator.

  For this reason, the node having the smallest difference between the maximum value and the minimum value of the reached voltage among the routes defined as the trunk line is set as the load center point. As for the definition of the trunk line, considering the fact that a thick distribution line is used for the trunk line and the reactance becomes large, the terminal node is extracted for the system on the terminal side from the voltage regulator and the reactance from the voltage regulator is calculated. There is a method in which the route from the voltage regulator to the utility pole with the maximum reactance is used as a trunk line.

  Next, in the processing step S11, the LDC R component from the impedance from the voltage regulator to the load center point, the X component of the LDC from the reactance from the voltage regulator to the load center point, and the ultimate voltage of the load center point during the entire period. The reference voltage is calculated as the optimal settling value from the average value or the intermediate value between the maximum voltage and the minimum voltage of the reached voltage at the entire load center point.

  At this time, if the maximum voltage and the minimum voltage of the voltage reached by each main pole of the main line are graphed with the horizontal axis as the length and the vertical axis as the voltage, the extraction result of the load center point can be confirmed on the graph. By displaying the average value of the impedance and reactance up to the load center point, and the ultimate voltage or the intermediate value between the maximum voltage and the minimum voltage on the graph, the operator can check the calculation process of the settling value based on the analysis results of multiple time sections. Easy to do.

  FIG. 9 is a diagram showing the concept of the load center point obtained as described above. The diagram on the right side of the left-side high-voltage voltage distribution example plots the difference between the maximum voltage and the minimum voltage determined by the plurality of high-voltage voltage distribution examples for each point on the length. The concept of performing the voltage drop compensation function in the distribution line in the voltage regulator at the substation exit end is shown with the point where the difference between the maximum voltage and the minimum voltage is minimized.

  Example 1 demonstrated examination in the direction which adds a voltage regulator newly on a distribution line. On the other hand, in the second embodiment, a method for determining the necessity of the already installed voltage regulator or optimizing various rules will be described.

  FIG. 10 is a flowchart showing the pole transformer tap value, the optimal arrangement of the voltage regulator, and the optimum settling value calculation algorithm based on the necessity determination of the existing voltage regulator according to the second embodiment of the present invention. The calculation processing contents of the system optimization calculation apparatus 10 shown in this figure will be described. The figure shows an example of a procedure for determining the pole transformer tap value and the optimum set value of the voltage regulator based on the voltage measurement data of the sensors in the distribution system and the power flow calculation results at each time.

  As a premise of the description of the second embodiment, the target distribution system includes one or more voltage regulators on the distribution line in addition to the voltage regulator at the substation outlet end. 11 and 12, the vertical axis indicates the low voltage of the distribution line, and the horizontal axis indicates the length of the distribution line. The voltage regulator SVR1 at the outlet of the substation and the voltage regulator SVR2 on the distribution line are provided. Yes. Here, whether or not the voltage regulator SVR2 on the distribution line can be removed, FIG. 11 shows a case where removal is possible, and FIG. 12 shows a case where removal is impossible.

  Hereinafter, the flow of the flowchart processing of FIG. 10 will be described. The processing up to the middle of the processing steps S1, S2 and S3 ′ is the same as that in FIG.

  In the first processing step S1, data necessary for processing is read. Decide the period to be analyzed (for example, the user may specify the past week, etc.), and acquire the measurement data and system data in the system necessary for executing the tidal current calculation for each time of the target period. Then, the tidal current calculation of the cross section for a plurality of times in the system from which the voltage regulator as the necessity determination target is removed is performed.

  In process step S2, the low voltage conversion voltage of each node is calculated using a pole transformer tap based on the voltage analysis result of the cross section for a plurality of time, and the average value is calculated.

  In process step S3 ′, the maximum voltage and the minimum voltage are extracted from the average value of the low-voltage converted voltages. When the difference between the maximum voltage and the minimum voltage of the low-voltage converted voltage is larger than the difference between the upper limit value and the lower limit value, a voltage deviation occurs regardless of how the voltage supplied from the voltage regulator is adjusted. Therefore, it is confirmed whether the deviation can be resolved by appropriately setting the pole transformer tap.

  At this time, in order to minimize the pole transformer whose tap is changed, the pole transformer of the utility pole in which the low voltage equivalent voltage is separated from the other utility pole in the section where each voltage regulator is in charge of voltage management. It is desirable to change the tap with priority. A utility pole for which a pole transformer tap is not appropriate always tends to have a higher or lower low-voltage equivalent voltage than other utility poles. Therefore, the average value Va of the low-voltage converted voltage of each utility pole and the average value Vb of the low-voltage converted voltage in the voltage management section are calculated from the time series data of the low-voltage converted voltage. In each power pole, the absolute value of the difference between Va and Vb is calculated as the degree of divergence | ΔVa |, and the pole transformer tap is preferentially changed from the power pole having the maximum | ΔVa |. Regarding the tap value after the change, when Va−Vb is larger than 0, that is, higher than the average voltage in the section, the tap is increased, and when Va−Vb is smaller than 0, that is, lower than the average voltage in the section. Lower the tap. When the difference between the maximum voltage and the minimum voltage of the low-voltage converted voltage in the voltage management range is Vd, Vd is reduced by changing the pole transformer tap. The change of the pole transformer tap is terminated when Vd becomes smaller than the target value Vd 'or the pole transformer tap change number reaches the preset upper limit number.

  The processing so far in the flowchart of FIG. 10 is basically the same as the processing of the flowchart of FIG. In the processing step S3 ′ of the flowchart of FIG. 10, the following processing is further executed.

  In process step S3 ′ of the flowchart of FIG. 10, the target value Vd ′ is set to a value smaller than the difference between the upper limit value and the lower limit value. Even if the number of pole transformer tap changes reaches the upper limit, if Vd is greater than Vd ', voltage change is necessary because the voltage deviation cannot be resolved even if the pole transformer tap is changed. It is determined that the target voltage regulator is necessary. When Vd becomes smaller than the target value Vd ′, it is determined that the voltage regulator that is necessary / unnecessary for determination is unnecessary.

  FIG. 11 shows an example in which it can be determined that the difference Vd between the maximum voltage and the minimum voltage is larger than the target value Vd ′, and FIG. 12 shows that the difference Vd between the maximum voltage and the minimum voltage is smaller than the target value Vd ′. Indicates an impossible case. In FIG. 11, even if the voltage regulator SVR2 is removed, the low voltage remains within the upper and lower limit values. However, in FIG. 12, when the voltage regulator SVR2 is removed, the low voltage does not fall within the upper and lower limits. .

  Next, in processing step S14, processing steps S1 to S3 are repeated for the case of FIG. 11 from which the plurality of voltage regulators are removed, and an arrangement case in which the number of voltage regulators determined to be necessary is minimized is extracted. When the number of installed units is the minimum but there are multiple placement cases, the minimum voltage margin when each voltage regulator is set to the ideal voltage in each case is obtained, and the minimum voltage margin is the largest, that is, the voltage margin is The arrangement case that can be maximized is determined as the optimum arrangement of necessity determination results.

  The subsequent processing in the flow of FIG. 10 is basically the same as the processing steps S8 to S11 of the flow of FIG.

  In the processing step S8, the ideal voltage of each voltage regulator is calculated so that the voltage margin becomes maximum in the system configuration of the optimal arrangement in the case of FIG. 11 where the necessity determination result is necessary. The maximum voltage and minimum voltage of the low-voltage converted voltage are extracted from all the power poles in the voltage management target range, so that the voltage margin for the upper limit value and the lower limit value is equal, that is, the voltage margin to the upper and lower limits is maximized for the entire system. The ideal voltage Vs is calculated with a suitable sending voltage. The ideal voltage Vs is calculated by the equations (6), (7), and (8) in the processing step S8 of the flow of FIG.

  At this time, the voltage correction amount ΔV with respect to the ideal voltage is calculated by the equation (9) in the processing step S8 of the flow of FIG.

  Next, in process step S9, the ultimate voltage based on the voltage calculation result of each utility pole in each time section is corrected by ΔV, and the ultimate voltage at each node when the voltage margin to the upper and lower limits is maximized is calculated. Since this study uses time-series voltage analysis results, when there are n-case voltage analysis results, processing is performed to correct the correction amount ΔV for n cases and the voltage reached by analysis of each power pole by ΔV.

  Although the voltage margin has been maximized in the above processing, the voltage drop compensation function in the distribution line is further realized in the next stage. For example, the voltage regulator at the substation outlet end performs constant secondary voltage control, and the secondary voltage in this case is the voltage at the virtual point (load center point) in the distribution line. In processing steps S10 and S11, a voltage drop compensation function in the distribution line is realized.

  For this reason, in the processing step S10, first, in the voltage curve of the multi-time section when the voltage regulator secondary side voltage is the ideal voltage, a node having a small change in the reached voltage is obtained throughout the entire time zone. Specifically, the maximum value and the minimum value of the reached voltage are extracted for each node, and the difference is calculated.

  Here, assuming that the load center point is the point where the impedance from the voltage regulator is R and the reactance is X in the actual system, the voltage regulator uses the impedance R and reactance X set by the LDC setting value to virtually Simulate the distribution line and calculate the voltage drop from the active / reactive power passing through the voltage regulator to the load center point. Appropriate voltage adjustment is realized by changing the tap value of the voltage regulator based on the assumed voltage drop amount so that the voltage reached at the load center point becomes the set reference voltage.

  In this case, the node where the difference between the maximum value and minimum value of the ultimate voltage is small should be the load center point, and the impedance and reactance from the voltage regulator to the load center point should be calculated from the ultimate voltage. However, it is necessary to extract the load center point from a point where the difference between the passing active power and reactive power of the voltage regulator is small. When the load center point is extracted from the branch line, there is a possibility that the passing active power and the reactive power greatly change between the voltage regulator and the load center point. The voltage drop amount assumed by the voltage regulator is a voltage drop amount when the passing active power / reactive power of the voltage regulator flows to the load center point. Therefore, when the active power / reactive power decreases between the load and the center point, the assumed voltage drop amount deviates from the actual voltage drop amount, and the voltage may deteriorate due to the tap operation of the voltage regulator.

  For this reason, the node having the smallest difference between the maximum value and the minimum value of the reached voltage among the routes defined as the trunk line is set as the load center point. As for the definition of the trunk line, considering the fact that a thick distribution line is used for the trunk line and the reactance becomes large, the terminal node is extracted for the system on the terminal side from the voltage regulator and the reactance from the voltage regulator is calculated. There is a method in which the route from the voltage regulator to the utility pole with the maximum reactance is used as a trunk line.

  Next, in the processing step S11, the LDC R component from the impedance from the voltage regulator to the load center point, the X component of the LDC from the reactance from the voltage regulator to the load center point, and the ultimate voltage of the load center point during the entire period. The reference voltage is calculated as the optimal settling value from the average value or the intermediate value between the maximum voltage and the minimum voltage of the reached voltage at the entire load center point.

  At this time, if the maximum voltage and the minimum voltage of the voltage reached by each main pole of the main line are graphed with the horizontal axis as the length and the vertical axis as the voltage, the extraction result of the load center point can be confirmed on the graph. By displaying the average value of the impedance and reactance up to the load center point, and the ultimate voltage or the intermediate value between the maximum voltage and the minimum voltage on the graph, the operator can check the calculation process of the settling value based on the analysis results of multiple time sections. Easy to do.

  The present invention and its embodiments described above have many features. The main points are outlined as follows.

  1stly this invention and its Example in the one side, The measurement database which stores the measured value of the electric quantity of each time of a power distribution system, The calculation apparatus which calculates the voltage of a power distribution system by power flow calculation, A plurality of power distribution systems Database for storing voltage analysis results of time sections, equipment database for storing existing voltage regulator installation position and pole transformer tap value, and setting of optimal pole transformer tap value and voltage regulator The optimum calculation device for calculating the value and the arrangement of the voltage regulator is provided, and the optimum tap value of the pole transformer, the set value and the arrangement of the voltage regulator are calculated from the voltage analysis result of the distribution system.

  Secondly, in another aspect of the present invention and its embodiment, the settling value of the voltage regulator is obtained by reducing the new installation / relocation of the voltage regulator by combining with the tap change of the pole transformer.

  Thirdly, in another aspect of the present invention and its embodiment, an automatic voltage regulator in which the set value of the voltage regulator is within the voltage upper and lower limit value range of the analysis target node of the distribution system in the analysis target period. The point where the difference between the maximum value and the minimum value of the reached voltage on the cross section for multiple time is minimized on the route defined as the trunk line so that the difference between the output voltage ideal value and the voltage regulator's passing load becomes small Is extracted as the load center point, and the line voltage drop compensator LDC is obtained from the impedance and reactance of the distribution line from the voltage regulator to the load center point as the set value of the voltage regulator, and the reference voltage is obtained from the reached voltage at the load center point.

  Fourthly, in another aspect of the present invention and its embodiments, the voltage regulator settling value calculation result is obtained by a technique that can be confirmed on a two-dimensional graph.

  Fifth, in another aspect of the present invention and its embodiment, the number of voltage regulators is minimized by combining the arrangement of voltage regulators with tap changes for pole transformers.

  Sixth, in another aspect of the present invention and the embodiment thereof, the optimum setting value of the voltage regulator in the system in which the arrangement of the voltage regulator and the tap change of the pole transformer are implemented is obtained simultaneously.

  Seventh, in another aspect, the present invention and its embodiment are already installed in the system depending on whether the voltage regulator can be placed within the voltage upper and lower limit range of the analysis target node of the distribution system. The number of installed voltage regulators is determined to minimize the number of installed voltage regulators, and the optimum set value of the voltage regulator in the system from which the SVR determined to be unnecessary is removed is obtained simultaneously.

  Eighth, in another aspect, the present invention and its embodiment minimize the number of installed voltage regulators and maximize the voltage margin with respect to the upper and lower limit values in the necessity determination of the voltage regulator in the arrangement of the voltage regulators. Ask for placement.

10: System optimization calculation device 100: Distribution system 110: Distribution substation 120: Node (bus)
140: distribution line 150: load 130: generator 170: sensor 180: communication terminal station 190: communication network 300: voltage regulator 310: tap control device

Claims (19)

A system optimization calculation device for a distribution system for obtaining an optimum system configuration of a distribution system including a plurality of tapped pole transformers on a distribution line,
By calculating the power flow of the distribution system, the first average value for the low voltage of each of the tapped pole transformers in a predetermined time zone and the low voltage of the plurality of tapped pole transformers in a predetermined time zone A first means for determining a second average value;
For the tapped pole transformer, a second means for changing the tap value so that the first average value approaches the second average value;
A system optimization calculation device for a distribution system, comprising: third means for executing tap value change processing until a predetermined condition for tap value change is satisfied. A system optimization calculation device for a power distribution system according to claim 1,
The second means gives priority to the tapped pole transformer having a low voltage indicating the first average value having a large deviation from the second average value, and the first average value is the first value. A system optimization calculation device for a distribution system, wherein a tap value is changed so as to approach an average value of 2. A system optimization calculation device for a power distribution system according to claim 1 or 2,
The predetermined condition for the tap value change in the third means is the number of tap value changes, or the difference between the maximum value and the minimum value for the low voltage of the tapped pole transformer is within a predetermined value. A system optimization calculation device for a power distribution system characterized by that. A system optimization calculation device for a power distribution system according to any one of claims 1 to 3,
In the third means, when a predetermined condition for changing the tap value is satisfied, the tap changing work is performed on the pole-mounted transformer with a tap on the distribution line determined to change the tap value by the second means. A system optimization calculation device for a distribution system, characterized in that an execution command is output. A system optimization calculation device for a power distribution system according to any one of claims 1 to 4,
The predetermined time zone is a plurality of time zones, and in a plurality of time zones, it is confirmed that a predetermined condition for the tap value change is satisfied. A system optimization calculation device for a distribution system according to any one of claims 1 to 5,
In the third means, when a predetermined condition for changing the tap value is not satisfied, a system optimization calculation device for a distribution system, which outputs a new voltage regulator installation command on the distribution line. A system optimization calculation device for a power distribution system according to claim 6,
Fourth means for determining the installation position of a new voltage regulator when the difference between the maximum voltage and the minimum voltage of the low voltage voltages of the plurality of tapped pole transformers in a predetermined time zone is larger than the target voltage. A system optimization calculation device for a distribution system, characterized by comprising: A system optimization calculation device for a power distribution system according to claim 7,
The fourth means uses the distribution of the low voltage with respect to the span obtained by the power flow calculation in the predetermined time zone of the distribution system, and the upper limit value or the lower limit set in the distribution system where the maximum voltage or the minimum voltage is low. In the distribution system, the position of the distribution system where the minimum voltage or the maximum voltage is the lower limit or upper limit set in the distribution system with a low voltage is set as the installation position of the new voltage regulator. Computerized equipment. A system optimization calculation apparatus for a power distribution system according to claim 7 or claim 8,
When the maximum voltage is an upper limit value set in the low-voltage distribution system using the distribution of the low-voltage voltage with respect to the span obtained by the power flow calculation in the plurality of predetermined time zones of the distribution system, Set the first position of the distribution system where the minimum voltage is the lower limit set for the low-voltage distribution system and the maximum voltage is set for the low-voltage distribution system when the minimum voltage is the lower limit set for the low-voltage distribution system A system optimization calculation device for a power distribution system, wherein a second position of the power distribution system that is the upper limit value obtained is obtained, and a position closer to the power supply side is set as a new voltage regulator installation position. A system optimization calculation device for a power distribution system according to any one of claims 7 to 9,
A fifth means for determining the value of the high voltage applied by the voltage regulator using the distribution of the low voltage with respect to the length obtained by the tidal current calculation in the predetermined time zone of the distribution system is provided. System optimization calculation device. A system optimization calculation device for a power distribution system according to claim 10,
The value of the high voltage provided by the fifth means is the difference between the maximum voltage and the upper limit value and the minimum voltage and the lower limit value using the distribution of the low voltage with respect to the length obtained by the power flow calculation in the predetermined time zone of the distribution system. A system optimization calculation device for a distribution system, characterized in that the difference is determined from the viewpoint of achieving the same state. A system optimization calculation device for a power distribution system according to any one of claims 7 to 11,
The voltage regulator has a line voltage drop compensation function for determining a specific position on the trunk line of the load-side distribution system as a load center point and controlling the voltage at the load center point constant. System optimization calculation device. A system optimization calculation device for a power distribution system according to claim 12,
Using the distribution of the low voltage with respect to the span obtained by power flow calculation in a plurality of the predetermined time zones of the distribution system, the position on the main line of the load side distribution system where the difference between the maximum voltage and the minimum voltage is the smallest is the load center point System optimization calculation device for distribution system, characterized in that A system optimization calculation method of a distribution system for obtaining an optimal system configuration of a distribution system including a plurality of tapped pole transformers on a distribution line,
As a database, a measurement database that stores measured values of the amount of electricity at each time of the distribution system, a system configuration data necessary for power flow calculation of the distribution system, a power flow calculation database that stores the results of power flow calculations and state estimation calculations, voltage adjustment Stores the control device setting database for storing the reference voltage of the voltage regulator and the LDC setting value, the voltage regulator ideal voltage database for storing the calculation result of the ideal value of the voltage regulator output voltage at each time, and the optimum arrangement of the voltage regulator Use the information stored in the pole transformer tap database that stores the control device arrangement database and pole transformer tap change results,
Based on the power flow calculation results and state estimation results, calculate the optimum tap of the pole transformer, calculate the ideal value of the voltage regulator's transmission voltage, and where the voltage regulator is required and whether or not the existing voltage regulator is necessary And calculating the settling parameter of the voltage regulator based on the reached voltage of each node when the ideal voltage is obtained. A system optimization calculation method for a power distribution system according to claim 14,
By preferentially changing the pole transformer of a node that has a large discrepancy from the low-voltage conversion voltage of another node, obtain the arrangement of the number of voltage regulators installed within the minimum number of pole transformer tap changes. System optimization calculation method of distribution system characterized by A system optimization calculation method for a power distribution system according to claim 14 or claim 15,
By determining the ideal value of the voltage regulator's sending voltage so that each voltage regulator can fit the voltage in the proper range as far as possible to the terminal pole, it is necessary to minimize the number of installed voltage regulators and obtain the arrangement. A system optimization calculation method for the distribution system. A system optimization calculation method for a power distribution system according to any one of claims 14 to 16,
The necessity of existing voltage regulators is judged from the difference between the maximum voltage and the minimum voltage in the voltage management range of each voltage regulator, the number of existing voltage regulators is minimized, and the margin to the voltage upper and lower limits is maximized A system optimization calculation method for a distribution system, characterized in that an arrangement to be obtained is obtained. A system optimization calculation method for a power distribution system according to any one of claims 14 to 17,
Calculate the ideal voltage of each time section of the voltage regulator that maximizes the voltage margin from the power flow calculation results of multiple time sections, find the node where the difference between the maximum value and the minimum value of the ultimate voltage is the minimum, A system optimization calculation method for a distribution system, wherein an optimum settling value of a voltage regulator is obtained from an arrival voltage at a load center point, an impedance from a voltage regulator to the load center point, and a reactance. A system optimization calculation method for a power distribution system according to claim 18,
In the system on the load side from the voltage regulator, the reactance from the voltage regulator to each node at the end of the system is calculated and the route from the voltage regulator to the node with the maximum reactance, or the system from the voltage regulator Define the route to the node with the largest number of voltage regulators installed at each terminal node and the maximum reactance from the voltage regulator as the trunk line, and extract the load center point from the trunk line System optimization calculation method of distribution system characterized by

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