JP6367740B2 - Equipment planning support apparatus and equipment planning support method for distribution system - Google Patents

Description

The present invention relates to an equipment plan support apparatus and equipment plan support method for a distribution system in which a plurality of voltage regulators each having a transformer with taps are arranged in series, and in particular, to reduce the number of huntings between a plurality of voltage regulators and voltage deviation The present invention relates to a facility planning support apparatus and a facility planning support method for a distribution system capable of providing an optimal operation settling value capable of reducing time.

A plurality of voltage regulators with transformers with taps are arranged in series in the distribution system, and each voltage regulator adjusts taps of transformers with taps so that the detected secondary voltage is within the allowable range. Is going. For this reason, when voltage regulators detect voltage deviations at a plurality of locations in the distribution system and individually start tap control, hunting that represents a series of operations in which each voltage regulator repeats tap adjustment with each other occurs. In addition, the voltage deviation time becomes longer.

  For this reason, an operation method of a distribution system capable of reducing hunting and shortening the voltage deviation time has been proposed.For example, in Patent Document 1, in order to reduce the voltage deviation time with respect to the setting of the voltage regulator installed in the distribution system, “The operation time constant of the automatic voltage regulator is dynamically changed according to the state of the system”.

JP 2012-182897 A

The method described in Patent Document 1 is intended for a voltage adjustment device that adjusts the tap position when the secondary voltage of the transformer with tap exceeds a predetermined voltage after a predetermined time (operation time constant). A voltage adjustment device that adjusts the tap position when the time integral value of the deviation voltage of the predetermined voltage of the secondary side voltage exceeds a predetermined value ( operation set value) is not assumed. Further, the method described in Patent Document 1 does not specify how to determine an operation set value for preventing hunting of a voltage regulator installed in series in a power distribution system.

Therefore, in the present invention, the voltage adjustment device that adjusts the tap position when the time integral value of the deviation voltage of the predetermined voltage of the secondary side voltage exceeds a predetermined value ( operation settling value ) makes the number of huntings below a predetermined value. An object of the present invention is to provide a facility planning support apparatus and facility planning support method for a power distribution system that sets an operation settling value .

In order to solve the above-mentioned problem, in the present invention, the voltage for adjusting the tap of the tapped transformer when the integrated value of the voltage at which the secondary voltage of the tapped transformer deviates from the allowable range exceeds the operation set value. A facility planning support device for a distribution system in which a plurality of regulators are arranged in series, and the facility planning support device is configured to determine an operation set value of each voltage regulator for an upstream voltage regulator and a downstream voltage regulator. A settling database that stores a number of huntings representing a series of operations in which a plurality of combinations and each voltage adjustment device repeats tap adjustment with each other when a combination of operation set values is combined, and operation settling read from the settling database value Pair, based on the corresponding hunting times, and the operation setting value settling processing unit for calculating a combination of operation setting value, the operation setting value settling A display unit for displaying the operation setting value and the hunting count management unit is calculated.

By using the operation settling value obtained in the present invention, hunting of the voltage regulator can be prevented. Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

The figure which shows the structure of a power distribution system and an equipment plan assistance apparatus. The figure which shows the specific structural example of an automatic voltage regulator . The figure which showed the example of the time transition of the secondary side voltage VL and the reference voltage VS. The figure which showed the example of the time transition of the difference voltage (DELTA) Vm obtained in the time of voltage fluctuation. The figure which shows an example of a processing flow when implement | achieving the transformer tap control of an automatic voltage regulator by the digital process by a computer. The flowchart of tidal current calculation program Prg1 and tap command calculation program Prg2. The flowchart of hunting frequency calculation program Prg3. The flowchart of the voltage deviation time calculation program Prg4. The flowchart of operation | movement setting value setting program Prg5. The figure which shows the information for every sensor stored in database DB1 of measurement data D1. The figure which shows the information for every branch stored in database DB2 of equipment data D2. The figure which shows the information for every automatic voltage regulator stored in database DB2 of equipment data D2. The figure which shows the information for every node stored in database DB3 of the tidal current calculation result data D3. The figure which shows the information for every automatic voltage regulator stored in database DB4 of tap data D4. The figure which shows the information for every node stored in database DB5 of the voltage deviation time calculation data D5. The figure which shows the information of hunting frequency | count and voltage deviation time stored in database DB6 of the setting data D6. The figure which shows the weighting coefficient and upper limit value information of the frequency | count of hunting and voltage deviation time which were stored in database DB6 of the setting data D6. The figure which shows the example of the display screen of an objective function value. The figure which shows the example of the display screen of voltage deviation time and the number of times of hunting. The figure which showed the structural example of the same power distribution system as what was illustrated in FIG. The figure which showed the case where a voltage fell from a distribution substation to the distribution line terminal. The figure which showed the state which raised the voltage of the terminal side by the terminal automatic voltage regulator 300b. The figure which showed the state which boosted the voltage of the terminal side by the upstream automatic voltage regulator 300a. The figure which showed the state which stepped down the voltage of the terminal side with the terminal automatic voltage regulator 300b.

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

  FIG. 1 is a diagram showing a schematic configuration of a power distribution system and an equipment plan support apparatus according to the present invention. According to this configuration, a plurality of voltage regulators 300 are installed in series in the distribution system 100 connected to the distribution substation 110. In addition, the voltage adjustment device 300 and the sensors 160 in each part of the distribution system are connected to the facility plan support device 10 via the communication network 200.

  Among these, the distribution system 100 includes a distribution substation 110, a node (bus) 120, a distribution line 140 connecting them, a load 170 and a generator 150 connected to the node 120, a sensor 160 installed in the distribution line, and a voltage adjustment. The apparatus 300 is configured. The distribution substation 110 includes a distribution substation bus 130 and a sensor 160. The sensor 160 measures the line current, current power factor, and node voltage V at the installation location, and sends information to the facility planning support apparatus 10 via the communication network 200.

Here, the equipment plan support device is a device that supports an operation plan of equipment such as the voltage adjustment device 300 installed on the distribution system 100, and more specifically, a plurality of voltage adjustment devices 300 on the distribution system 100. As a plan for preventing frequent tap control and hunting in, the optimum set value of tap control in each voltage adjusting device 300 is provided. As a form of support in this case, the determined optimum set value may be directly set to each voltage adjusting device 300 and set, or the obtained optimum set value is displayed on the display screen of the display device, etc. Actual operation may be left to the operator.

As for the voltage regulator 300, FIG. 1 shows an example in which an automatic voltage regulator SVR (SVR: Step Voltage Regulator) is adopted, but this is also applied as a load-tap switching transformer LRT (LRT: Load Ratio Control Transformer). Good. Moreover, it is good also as an apparatus which adjusts the number of connections of a reactor or a capacitor | condenser with a tap changer like a tap change branch reactor or a tap change parallel capacitor. In the present invention, these are collectively referred to as a voltage regulator 300. In the following description, a case where the voltage regulator 300 is an automatic voltage regulator SVR will be described.

The automatic voltage regulator 300 in FIG. 1 includes a transformer 310 composed of a single-turn transformer and a tap changer, a control unit 320 that controls the taps of the transformer, and the facility planning support apparatus 10 via the communication network 200. The communication unit 330 is configured to receive an operation set value of the control unit 320. In the embodiment of the present invention, the facility plan support apparatus 10 determines the operation set value of the control unit 320.

FIG. 2 shows a more specific configuration example of the automatic voltage regulator 300 . As shown in FIG. 2, the transformer 310 of the automatic voltage regulator 300 is configured by connecting a tap changer 302 and a single-turn transformer 301 between a primary side distribution line and a secondary side distribution line. .

  Further, the voltage and current of the secondary distribution line are detected for the tap operation in the control unit 320 that controls the tap of the transformer. For the transformer secondary side voltage, the voltage detection transformer PT is connected in parallel to the secondary side distribution line, and the output side wiring of the voltage detection transformer PT is connected to the measurement unit 340 in the control unit 320 and inputted. . Regarding the secondary side current, the secondary side wiring of the current detection transformer CT for the secondary side distribution line is connected to the measuring unit 340 in the control unit 320 and inputted.

The control unit 320 includes a measurement unit 340, a line voltage drop compensation circuit (LDC: Line Drop Compensator) 350, and an automatic voltage adjustment unit 360. The current and voltage on the secondary side of the distribution line obtained by the measurement unit 340 generate a voltage at the virtual point of the distribution system (hereinafter simply referred to as the secondary side voltage _VL ) in the line voltage drop compensation circuit (LDC) 350. In the automatic voltage adjustment unit 360 in the control unit 320, the secondary side voltage _VL obtained by the line voltage drop compensation circuit (LDC) 350 and the operation set value (reference voltage) of the control unit 320 obtained through the communication network 200 are obtained. VS etc.) is used to give a control command signal composed of a step-up / step-down command or the like to the tap changer 302, and the tap changer 302 performs tap control by the tap changer 302.

The automatic voltage adjustment unit 360, when power is sent from the primary distribution line to the secondary distribution line, when the current secondary voltage V _L satisfies a certain condition with respect to the reference voltage V _S A voltage control function for performing voltage control by outputting a tap switching command to the tap switcher 302 is provided. Various setting values (operation setting value , dead band, reference voltage, etc.) necessary for the voltage control function here are received by the communication device 330 from the facility planning support device 10 via the communication network 200, and the automatic voltage adjustment unit 360 is received. Sent to.

The processing in the automatic voltage adjustment unit 360 is a tap operation determination based on integral value control of voltage deviation, and this integral value control is executed, for example, according to the following concept. FIG. 3 is a diagram showing an example of time transition of the secondary side voltage V _L and the reference voltage V _S , where time is plotted on the horizontal axis and voltage (secondary voltage V _L and reference voltage V _S ) is plotted on the vertical axis. Show. This example shows an example in which the variable secondary voltage V _L generally increases with respect to a constant reference voltage V _S. As a result, the difference voltage between the two changes from the initial negative voltage to the positive voltage. In FIG. 3, the symbol m attached to the secondary side voltage _VL means the order of the sampled secondary side voltage in the case of performing digital processing.

FIG. 4 is a diagram showing an example of the time transition of the differential voltage obtained when the voltage _VL shown in FIG. 3 varies with time. The horizontal axis represents time and the vertical axis represents voltage deviation (secondary voltage). The difference between V _L and the reference voltage V _S is shown. In this example, when the ratio of the differential voltage to the reference voltage V _S , that is, the voltage deviation V _Hm exceeds the dead zone K, the excess difference ΔV _m is integrated over time, and the integrated value exceeds the operation set value. Output control commands. That is, it is an evaluation target whether or not the voltage deviation V _Hm exceeds the dead zone. In this example, since the current secondary side voltage V _L is higher than the reference voltage V _S, a command to step down by one tap is output when the secondary side voltage V _L satisfies the above condition, and the tap Switcher 302 switches taps based on the command. The dead zone is set to K% on the step-down side (+) and the step-up side (−).

FIG. 5 shows an example of a processing flow when the transformer tap control of the automatic voltage regulator described above is realized by digital processing by a computer. In the first processing step S401, the secondary voltage _VLm is read into the automatic voltage adjustment unit 360. Here, the secondary side voltage V _Lm means a value at a predetermined time when the secondary side voltage is sampled and input at a predetermined cycle.

In process step S402, the automatic voltage adjustment unit 360 obtains a voltage deviation difference ΔV _m . The method of _obtaining the voltage deviation V _{Hm that is} an element for obtaining ΔV _m is based on the following equation (1). Note that VS is a reference voltage shown in FIG.
[Equation 1]
V _Hm = (V _Lm −Vs) / Vs * 100 (1)
ΔV _m is obtained from the following equation (2) by subtracting the dead zone settling value K from the voltage deviation.
[Equation 2]
ΔV _m = V _Hm −K (2)
However, in the calculation, the numerical value to be substituted for K is determined whether V _Hm is positive or negative, and if positive, a positive value is substituted for K, and if negative, a negative value is substituted for K as a settling value. And

In process step S403, the automatic voltage adjustment unit 360 performs integration on the boost side. Adding this difference [Delta] V _m in _{S Rm-1} is the integral value of the [Delta] V _m up to the previous time, we obtain an integrated value _{S R} at present. In the case of boosting, since the secondary side voltage is lower than the reference voltage, V _Hm becomes negative. Therefore, addition processing is performed by multiplying by minus.

Automatic voltage adjustment unit 360 at the processing step S404, S405, when the integral value _{S R} is negative, 0 is substituted to the integral value SR. Automatic voltage adjustment unit 360 in the process step S406 rewrites the _{S R} in m-th integral value _{S Rm.} In processing steps S407 and S408, the automatic voltage adjustment unit 360 determines whether or not the integral value _SRm exceeds the operation set value τ. If it exceeds, a command for switching to the step-up side is output to the tap changer 302, and the operation proceeds to step-down integration. Even when the integral value does not exceed the operation set value τ, the process proceeds to the step-down integration as it is.

  The series of processing from the above processing steps S403 to S408 shows processing when boost control is achieved by tap switching. The subsequent series of processing from step S409 to S413 shows processing when the step-down control is similarly performed by tap switching.

In processing step S409, the automatic voltage adjustment unit 360 adds the current difference ΔV _m to S _Lm−1 , which is the integrated value of the difference ΔV _m up to the previous time, as the step-down integration, and obtains the current integration value _SL . Ask. In processing steps S410 to S414, the same procedure as the step-up side integration is performed, and it is determined whether or not the integral value S _Lm exceeds the operation set value τ. Outputs a command to switch to the step-down step.

  Returning to FIG. 1, the specific configuration of the equipment plan support apparatus 10 will be described next. In the facility plan support apparatus 10, 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 M are connected to a bus line 30. In this case, seven databases DB are formed in the memory M. In this case, the database DB is a database DB1 of measurement data D1, a database DB2 of equipment data D2, a database DB3 of tidal current calculation result data D3, and tap data D4. Database DB4, voltage deviation time calculation data D5 database DB5, settling data D6 database DB6, and program data D7 database DB7.

  In this configuration, the computer (CPU) 13 executes a calculation program to instruct image data to be displayed on the display device 11, search for data in various databases DB, and the like. The RAM 15 is a memory for temporarily storing calculation result data such as display image data, power flow calculation result data D3, tap data D4, voltage deviation time calculation data D5, and settling data D6. The CPU 13 generates necessary image data. Display on the display device 11 (for example, a display screen).

  The storage contents of the seven databases DB formed in the memory in the facility plan support apparatus 10 are as follows. The database DB1 of the measurement data D1 stores a table in which information such as line current, power factor, and node voltage V measured by the sensor 160 in the distribution system 100 is associated with the measurement time (time section). An example is shown in FIG.

In the example of FIG. 10, the voltage, current, and power factor in units of time are recorded for each sensor for the sensors 160a, 160b, and 160c installed in various places in the distribution system. These data D1 are transmitted via the communication network 200 and the communication means 14 of the facility plan support apparatus 10. According to the recording example of FIG. 10, the data measured by the sensor 160a installed in the distribution substation 110 is the voltage 6800 (V), the current 100 (A), and the power factor 98 (%) at the time 00:00:00. ), Voltage 6750 (V), current 150 (A), power factor 97 (%) at time 00:00:01, voltage 6550 (V), current 70 (A), power factor 98 at time 00:00:02 The content changed in time series like (%). Similar sensor information is also prepared for the sensor 160b installed downstream of the automatic voltage regulator 300a and the sensor 160c installed downstream of the automatic voltage regulator 300b in the same manner as the sensor 160a.

  The database DB2 of the equipment data D2 stores a table in which the line constant Z (= R + jX) indicating the impedance of the line (branch) 140 and the line 140 are associated with each other. An example of the table is shown in FIG. System configuration data representing the load / power generation amount and the connection status of lines and nodes of the system is stored. In the example of FIG. 11, resistance and reactance values as line constants are stored for each of the branches 140a and 140b.

In the recording example of FIG. 11, the impedance of the line (branch) 140a between the distribution substation 11 and the automatic voltage regulator 300a is set such that the resistance R is 0.05 (Ω) and the reactance X is 0.10 (Ω). is, the impedance of the line (branch) 140b between the automatic voltage regulator 300a and the automatic voltage regulator 300b is resistor R is 0.06 (Omega), the reactance X is set to 0.120 (Omega).

Also in the database DB2 of the equipment data D2, a set point, setting range of various setpoint for automatic voltage regulator (operation setting value, the dead zone, the reference voltage), a table which associates an integer scheduled Mito automatic voltage regulator ID Is stored. An example of the table is shown in FIG. In the example of FIG. 12, an operation set value (% sec), a dead zone, and a reference voltage are stored for each of the automatic voltage adjustment devices 300a and 300b . The operation set value (% sec) includes settling range and step information.

The recording example of FIG. 12, the automatic voltage regulator 300a, stabilization range 30 to 90, in increments of 30, the dead zone is 1.0 (%), the reference voltage is a 6700 (V), similarly the automatic voltage regulator For 300b, the settling range and the increment are the same numerical value, the dead zone is 1.0 (%), and the reference voltage is 6600 (V).

  In the database DB3 of the tidal current calculation result data D3, the calculation time (time section) and the node number are associated with the calculation result information such as the current, power factor, and node voltage of the line as the result of the tidal current calculation by the program data D7. Stored tables. An example of the table is shown in FIG. In the example of FIG. 13, for nodes 120a, 120b, 120c, 120d, and 120e, estimated values of voltage, current, and power factor in time units are recorded for each node.

  In the recording example of FIG. 12, estimated values of voltage, current, and power factor in time units for the node 120b are described. In this example, since the sensor 160b is installed at the position of the node 120b and the information of FIG. 10 is obtained, the detection information of the sensor 160b is directly used as the information of the node 120b. On the other hand, for example, since no sensor is installed in the node 120c, the value of the node 120c is calculated from the detection information of the sensor 160b and the measurement information of another sensor (for example, 160c), and the result of the power flow calculation by the program data D7. Is stored as an estimated value.

In the database DB4 of the tap data D4, a table in which the tap number, the step-up / step-down command value, and the command time are associated with each of the automatic voltage regulators 300a and 300b is stored as a result of the tap command value calculation by the program data D7. An example of the table is shown in FIG. In FIG. 14, the command time, the step-up / step-down command value, and the tap number are recorded for each of the automatic voltage regulators 300a and 300b .

In the recording example of FIG. 14, the table of the automatic voltage regulator 300 a has a boost and a tap number 6 as the step-up / step-down command value at time 09:50:00 as the step-up / step-down command value at time 12:00:30. The step-down / tap number 5 is recorded. Similarly, in the table of the automatic voltage regulator 300b, the step-up / tap number 7 is recorded as the step-up / step-down command value at the time 11:30. According to these series of tap operation processes, the automatic voltage regulator 300b first boosts to tap number 6, then the automatic voltage regulator 300a boosts to tap number 7, and then the automatic voltage regulator 300b taps to tap number 5. There is still a history of stepping down.

  The database DB5 of the voltage deviation time calculation data D5 stores a table in which the upper and lower limit values of the voltage allowable region in each node 130 are associated with the node number. An example of the table is shown in FIG. In FIG. 15, voltage allowable regions (upper limit voltage and lower limit voltage) in each node 130 (130a, 130b, 130c, 130d, 130e) are stored.

Incidentally, according to the recording example of FIG. 15, the upper limit voltage and lower limit voltage of the nodes 130a and 130b are 6900 (V) and 6600 (V), and the upper limit voltage and lower limit voltage of the node 130c are 6800 (V) and 6500 (V). The upper limit voltage and lower limit voltage of the nodes 130d and 130e are 6700 (V) and 6400 (V). Thus, the upper limit voltage and the lower limit voltage of the node 130 are set to lower values as the distance from the substation increases.

In the database DB6 of the settling data D6, the number of hunting times, voltage deviation time and the sending side (first) automatic voltage regulator 300a and the terminal side (first side) (the first side) are the results of the hunting frequency calculation and the voltage deviation time calculation by the program data D7. 2) A table in which each operation set value of the automatic voltage regulator 300b is associated is stored. An example of the table is shown in FIG. 16, case 1, 2, 3 sender 30, 60, 90 (% operation setting value of the automatic voltage operation the set point 30 of the adjusting device (% sec) is fixed to the distal automatic voltage regulator sec ) Hunting count and voltage deviation time when variably set. Similarly, in cases 4, 5, and 6, the operation set value of the sending side automatic voltage regulator is fixed to 60 (% sec), and in cases 7, 8, and 9, the operation set value of the sending side automatic voltage regulator is set to 90 (%). When the operation settling value of the terminal side automatic voltage regulator is variably set to 30, 60, 90 (% sec), the hunting frequency and voltage deviation time are stored.

In the recording example of FIG. 16, the number of huntings and the voltage deviation time when the operation setting value of the terminal-side automatic voltage regulator is 30, 60, and 90 (% sec) in cases 1, 2, and 3 are 10,000 and 100, respectively. 1000 and 200, and 100 and 300. In cases 4, 5, and 6, the hunting times and voltage deviation times when the operation settling value of the terminal-side automatic voltage regulator is 30, 60, and 90 (% sec) are 5000 and 500, 500, 1000, and 50, respectively. 1500. In cases 7, 8, and 9, when the operation settling value of the terminal side automatic voltage regulator is 30, 60, and 90 (% sec), the hunting times and voltage deviation times are 2500 and 1000, 250, 2000, and 25, respectively. 3000.

According to this case analysis, when the operation set value of the terminal-side automatic voltage regulator increases, the number of huntings decreases, but the voltage deviation time increases. The larger the operation set value of the sending side automatic voltage regulator, the smaller the number of hunting times and the longer the voltage deviation time.

The database DB6 of the settling data D6 stores a table in which the hunting times used for setting the operation settling value of the program data D7, the respective weighting factors of the voltage deviation time, and the upper limit value are stored. An example of the table is shown in FIG. According to FIG. 17, the weighting coefficient and the upper limit value are stored for the hunting count and the voltage deviation time, respectively. In the recording example of FIG. 17, the weighting coefficient is set to 0.3 and the upper limit value is set to 3000 for the number of times of hunting, and the weighting coefficient is set to 0.7 and the upper limit value is set to 1000 for the voltage deviation time.

The database DB7 of the program data D7 includes a power flow calculation program Prg1, a tap command value calculation program Prg2, a hunting frequency calculation program Prg3, a voltage deviation time calculation program Prg4, an operation settling value settling program Prg5, and a display creation program Prg6. Store. These programs are read out by the CPU 13 as necessary and are calculated.

Next, the calculation processing contents of the facility plan support apparatus 10 using the data D of the database DB and the program Prg will be described. The facility planning support apparatus estimates the number of times of hunting and voltage deviation time for each combination of operation set values of the transmission side (first) automatic voltage regulator 300a and the terminal side (second) automatic voltage regulator 300b installed in series. Using these, the operation settling value setting program Prg5 is executed, and the operation settling value at which the sum of the values multiplied by the respective weighting coefficients is minimized is determined.

In this case, the number of times of hunting and the voltage deviation time are obtained as follows. First, the tidal current calculation program Prg1 and the tap command value calculation program Prg2 are executed using the measurement data D1 of a plurality of cross sections to calculate the node voltage and the tap number and the step-up / step-down command of the automatic voltage regulator . The node voltage of the cross section obtained in this way is stored in the database DB3 (FIG. 13) of the power flow calculation result data D3. The tap number and the step-up / step-down command of the automatic voltage regulator having a plurality of time sections are stored in the database DB4 (FIG. 14) of the tap data D4.

Next, the hunting frequency calculation program Prg3 is executed using the tap number and the step-up / down command of the automatic voltage regulator of the multi-time section of the tap data D4 to calculate the hunting frequency. The number of hunting times is stored in the database DB6 (FIG. 16) of the settling data D6.

  Finally, the voltage departure time is calculated by executing the voltage departure time calculation program Prg4 using the node voltage of the power flow calculation result data D3. The voltage deviation time is stored in the database DB6 (FIG. 16) of the settling data D6.

Hereinafter, each process of the power flow calculation program Prg1, the tap command value calculation program Prg2, the hunting frequency calculation program Prg3, the voltage deviation time calculation program Prg4, and the operation set value settling program Prg5 will be described.

  FIG. 6 is a flowchart showing processing of the power flow calculation program Prg1 and the tap command calculation program Prg2 among the programs stored in the database DB7 of the program data D7. In this series of processes, the processing steps S501 to S506 are related to the power flow calculation program Prg1, and the processing steps S507 to S512 are related to the tap command calculation program Prg2. In order to estimate the step-up / step-down operation of the tap, this process needs to be calculated in an order such that the time of the measurement data D1 is in time series.

  First, in processing step S501, a line constant Z (= R + jX) and a system configuration (node 120, branch 140) necessary for power flow calculation are read. For example, the node 120 that configures the distribution system of FIG. 1 as a user input obtained in advance through the input means 12 is obtained from the database DB2 of the equipment data D2 of FIG. 2 for each branch and the line constant Z (= R + jX). Information on the branch 140 is read into the RAM 15.

  In processing step S502, the node voltage, load 140, and power generation amount 150 of the substation (swing node) necessary for power flow calculation are read from the database DB1 of the measurement data D1 to the RAM 15. For example, in the example of FIG. 1 and FIG. 10, the node voltage of the substation is the voltage measurement value of the sensor 160a (first) with reference to the database DB1. The load 140 is a value obtained by subtracting the current of the sensor 160b (second) from the current of the sensor 160a (first).

In process step S503, the operation set value , dead zone, and reference voltage necessary for the tap command calculation are read from the database DB2 of the equipment data D2 to the RAM 15.

  In process step S504, the tap number of the newest time required for tidal current calculation and tap command calculation is read from the database DB4 of the tap data D4 to the RAM 15.

  In process step S505, power flow calculation is performed using the data set in process steps S501, S502, and S504, the voltage, line current, and power factor of each node are calculated, and the calculation results are stored in the RAM 15. As various tidal current calculation methods are known, an appropriate method can be adopted. The processing so far corresponds to the power flow calculation program Prg1.

  In process step S506, the voltage, line current, and power factor of each node obtained in process step S505, and the time of measurement data used for the calculation are output. Here, the output is stored in the database DB3 as the tidal current calculation result data D3 in the format shown in FIG.

  The above process is the process in the power flow calculation program Prg1, and then the process proceeds to the process of the tap command value calculation program Prg2. First, in process step S507, the data set in process step S503 and the node voltage obtained in process step S505 are obtained. To perform tap command calculation. The tap command value calculation process is the process flow of FIG.

  In processing steps S508 and S510, the presence / absence of a boost command and the presence / absence of a step-down command are determined. In response to this, in processing steps S509 and S511, 1 is added to the tap number when there is a boost command, and 1 is subtracted from the tap number when there is a step-down command. Every time there is a boost command, the value is incremented, and every time there is a step-down command, it is subtracted.

  In process step S512, the tap number, the step-up / down command, and the time of the measurement data used for the calculation are output. Here, the output is stored in the database DB4 as tap data D4 as shown in FIG.

  FIG. 7 is a flowchart showing the processing of the hunting count calculation program Prg3 in the database DB7 of the program data D7. This process is executed when tap numbers of cross sections for a plurality of hours are accumulated in the tap data D4. The multi-time section is, for example, one month or one year, and is processing using the experience value stored during this time.

First, in order to explain the method of calculating the number of times of hunting, the tap operation when hunting occurs will be explained with reference to FIG. FIG. 20A shows a configuration example of the same distribution system as that illustrated in FIG. Here, a power distribution system in which two automatic voltage regulators 300 (300a, 300b) are installed in series is shown. 20 (b) to 20 (e) are graphs showing time-series voltage changes and tap operation examples of the automatic voltage regulator 300 in the power distribution system of FIG. 20 (a). 20 (b) to 20 (e), the horizontal axis represents the distribution line length, and the vertical axis represents the node voltage. The node voltage is described in comparison with the dead zone, and according to this, the measured voltage at each part of the distribution line is shown.

  FIG. 20B shows a situation where the voltage decreases from the distribution substation 110 to the end of the distribution line. In addition, the node voltage in the vicinity of the node 120b is lower than the lower limit of the dead zone. Therefore, the line on the terminal side of the node 120b is in a state where voltage improvement (boost) is necessary.

FIG. 20 (c) shows that the automatic voltage adjusting device 300b at the end that has detected the state of FIG. 20 (b) (the node voltage has fallen below the lower limit of the dead band) taps the automatic voltage adjusting device 300a on the upstream side. A state is shown in which the voltage on the terminal side is boosted from the secondary side (node 120d) of the automatic voltage regulator 300b by switching. Thereby, the voltage is maintained at a voltage equal to or higher than the lower limit of the dead zone on the upstream side of the node 120b and on the terminal side of the node 120d, but the voltage is not improved (boosted) between the node 120b and the node 120d.

FIG. 20D shows that the upstream automatic voltage regulator 300a that has detected the state of FIG. 20C (the node voltage between the node 120b and the node 120d is equal to or lower than the lower limit of the dead band) is the upstream distribution substation. 110 shows a state in which the tap is switched before the automatic voltage regulator in 110 to increase the voltage on the terminal side from the secondary side (node 120b) of the automatic voltage regulator 300a. As a result, the node voltage can be maintained above the lower limit of the dead zone over the entire distribution line. Furthermore, after that, the automatic voltage regulator 300a of the upstream distribution substation 110 switches the tap later than the automatic voltage regulator 300b to change the terminal voltage from the secondary side (node 120b) of the automatic voltage regulator 300a. Boost the pressure.

At this time, voltage control of the automatic voltage regulator 300a and the automatic voltage regulator 300b interferes, and the voltage on the terminal side from the secondary side (node 120d) of the automatic voltage regulator 300b may deviate from the upper limit of the dead zone. is there. In the example shown in the figure, the voltage of the node 120d shows a state where it deviates from the upper limit of the dead zone. For this reason, the node 120d newly needs to return the tap to the initial position and lower the voltage.

20E detects the state of FIG. 20D (the voltage at the node 120d deviates from the upper limit of the dead zone), and the automatic voltage regulator 300b switches the tap to change the secondary of the automatic voltage regulator 300d. A state in which the voltage on the terminal side is stepped down from the side (node 120d) is shown.

FIGS. 20B to 20E show examples in which the terminal voltage is equal to or lower than the lower limit of the dead zone, but it is also possible to assume a case where the upper limit of the dead zone is similarly exceeded. Assuming that FIGS. 20 (b) to 20 (e) exceed the upper limit, if the voltage deviates from the dead band upper limit in FIG. 20 (b), the automatic voltage regulator 300b in FIG. 20 (c). 20 (d), the automatic voltage regulator 300a can be easily stepped down, and the automatic voltage regulator 300b can be easily boosted in FIG. 20 (e).

  Thus, in the tap operation by the voltage regulator 300 of the power distribution system, the time constant is set so that each voltage regulator 300 corresponds to the voltage drop (voltage rise). For this reason, depending on the correspondence between the upstream side and the downstream side, hunting of the tap operation may occur. In the following, the number of times of hunting is calculated using the pattern of tap operation during hunting as shown in FIG. Specific processing will be described with reference to FIG. FIG. 7 shows the specific processing contents of the hunting frequency calculation program Prg3.

In process step S601 of FIG. 7, the times T _RN-1 and T _RN of the two time sections of the step-up or step-down command of the terminal side (second) automatic voltage regulator are read. Here, the data is read from the database DB4 of the tap data D4 to the RAM 15. For example, in the case of FIG. 14, referring to the table of SVRb which is the terminal side (second) automatic voltage regulator , the boost command time is the time when the tap is changed to tap number 6 and TRN _-1 is 9:00 50 minutes 00 seconds, also stepping down instruction time, _{T RN} is read as 12 00 30 seconds as the time for changing the tap to tap number 6.

At processing step S602, the distal (second) occurs between the stepping down instruction time _{T RN} from boost command time _{T RN-1} obtained by reference to SVRb table is an automatic voltage regulator, the transmitting side automatically present is read command time T _S of the step-up or step-down of the voltage regulator (first). In the case of FIG. 14, referring to a table of a sender automatic voltage regulator (first 1) SVRa, as boost command time changing the taps to the tap number _{7, T RN-1} is 11:30 00 seconds Is present.

At processing step S603, if the instruction time T _S of the step-up or step-down of the delivery-side automatic voltage regulator (first) there are a plurality, and determined not to be the tap operation by hunting, the process ends.

At processing step S604, the If the command time _{T S} of the step-up or step-down of one of the delivery-side automatic voltage regulator in the process step S603 (first) _{is, T RN-1} determines whether boost command. Here, T _RN-1 means the time cross section of FIG.

In the processing step S605, S606, S609, the tap operation, the operation pattern when deviating from the lower limit voltage of the dead band, i.e., _{T RN-1} is boost command, _{T S} is boost _command, if _{T RN} is as a stepping down instruction In step S609, 1 is added to the number of huntings. Here, the number of times of hunting is stored in the database DB6 of the settling data D6. For example, it is described in the table of FIG.

In addition the processing steps S607, S608, S609, the tap operation, the operation pattern when deviating from the upper limit voltage of the dead band, i.e., _{T RN-1} is a step-down command, _{T S} is stepping down _instruction, if _{T RN} is as a boost command In step S609, 1 is added to the number of huntings. Here, the number of times of hunting is stored in the database DB6 of the settling data D6. For example, it is described in the table of FIG.

  By the processing of the processing steps S601 to 609, it is possible to grasp the hunting frequency (hunting frequency) when each operation setting is set.

  FIG. 8 is a flowchart showing the processing of the voltage deviation time calculation program Prg4 stored in the database DB7 of the program data D7. This process may be performed every time the tidal current calculation result data D3 is updated, or may be performed when a tidal current calculation result of a plurality of time sections is accumulated. The multiple time section is, for example, one month or one year.

  In process step S701 of FIG. 8, the node voltage Vm is read. Here, it reads from tidal current calculation result data D3. For example, the voltage (6800V) shown in FIG.

  In process step S702, the upper and lower limit values Vmax and Vmin of the voltage allowable region of each node are read. Here, it is read from the voltage deviation calculation data D5. For example, the upper limit value Vmax (6900V) and the lower limit value Vmin (6600V) shown in FIG.

  In process steps S703 to S705, when deviating from the upper and lower limit values Vmax and Vmin of the voltage allowable region of the node voltage Vm (Vm <Vmin or Vm> Vmax), 1 is added to the voltage deviation time.

  Through the processing of processing steps S701 to S705, the voltage quality (voltage deviation time) when each operation setting is set can be quantitatively grasped.

FIG. 9 is a flowchart showing the processing of the motion set value set program Prg5 stored in the database DB7 of the program data D7. This process may be performed every time the settling data D6 is updated, or may be performed every predetermined period. The predetermined period is, for example, one month or one year.

In process step S801 of FIG. 9, the condition for setting the operation set value is read. Here, from the table of FIG. 17 stored in the settling data D6, the weighting factor (hunting frequency = 0.3, voltage deviation time = 0.7) and the upper limit value (hunting frequency = 3000, voltage deviation time = 1000) are obtained. Read.

In process step S802, the number of times of hunting and voltage deviation time for each operation set value are read. Here, the table shown in FIG. 16 is read from the settling data D6.

In process step S803, the objective function shown in the following mathematical expression (3) is calculated. The objective function is a sum F of values obtained by multiplying the weighting factors W _H and W _VE by the number of times of hunting _NH and the voltage deviation time T _VE . The values obtained in FIG. 16 are used for the number of huntings _NH and the voltage deviation time _TVE .
[Equation 3]
F = W _H * N _H + W _VE * T _VE (3)
In process step S804, a solution that minimizes the objective function, an operation set value , the number of times of hunting, and a voltage deviation time are obtained under the constraint conditions shown in the following mathematical expressions (4) and (5). Constraint conditions were set as the objective function upper limit _{N Hmax} of each hunting number _{N H} and the voltage deviation time _{T VE,} does not exceed _{T Vemax.} As the upper limit values N _{Hmax and} T _VEmax , those set in FIG. 17 are used.
[Equation 4]
N _H <N _Hmax (4)
[Equation 5]
T _VE <T _VEmax (5)
In process step S805, when the solution of process step S804 exists, the operation set value at that time is output. The operation set value is transmitted to the automatic voltage regulator 300 via the communication means 12 of the equipment plan support apparatus 10 and the communication network 200.

  In processing step S806, when there is no solution in processing step S805, a change command for setting conditions (weighting coefficient, number of times of hunting and upper limit value of voltage deviation time) is displayed on the display device 11 of the facility planning support apparatus 10. The user changes the settling condition of the settling data 26 using the input means 12.

The processing of the processing step S801～805, hunting frequency and voltage deviation time can be determined automatically the operation setting value to be the predetermined value or less.

Next, an example of the settling result display of the operation settling value will be described with reference to FIGS. FIGS. 18 and 19 are explanatory diagrams showing examples of display on the display means 11 of the settling result of the operation set value . Here, display on a display screen is considered.

In the graph of FIG. 18, the horizontal axis is the case (1 to 9) of the combination of operation set values shown in FIG. 16. The vertical axis represents the value of the objective function in equation (3). For example, when the objective function of equation (3) is obtained for case 1 in FIG. 16, the weighting factor W _H (0.3) of the number of times of hunting N _H (10000), the voltage deviation time T _VE (100), and the number of times of hunting N _H The value of the objective function obtained from the weight coefficient W _VE (0.7) of the voltage deviation time T _VE is 3000. In Case 2 of Figure 16, the hunting number _N H (1000), the voltage deviation time _T VE (200), the weighting factor of the weighting factor of hunting number _{N H W H} (0.3) Voltage deviation time _{T VE W VE} (0 The value of the objective function obtained from .7) is 510. In case 3, hunting frequency N _H (100), voltage deviation time T _VE (300), weighting factor W _H (0.3) for hunting frequency N _H , weighting factor W _VE for voltage deviation time T _VE (0.7) The value of the objective function obtained from is 240.

  In the same manner, the value of the objective function in each case is obtained under the constraints of equations (4) and (5), and plotted is the graph of FIG. Here, the plot of case 3 highlighted by a broken-line circle is the minimum solution obtained in process step S804 of FIG.

  In the graph of FIG. 19, the horizontal axis represents the number of huntings shown in FIG. The vertical axis represents the voltage deviation time shown in FIG. Two broken lines indicate the upper limit of the number of times of hunting and the voltage deviation time shown in FIG. Here, the plot of case 3 highlighted by a broken-line circle is the solution obtained in process step S804 of FIG.

By displaying in this way, it becomes possible to convey the settling result of the operation settling value to the user in an easy-to-understand manner. In addition, when a command to change the settling conditions (weighting coefficient of hunting time and voltage deviation time and upper limit value) is issued in the processing step S806 of FIG. 9, it becomes easy to determine the settling conditions for which there is a solution of the restricted objective function. . Here, an example of output to the screen is shown, but the data may be provided to the user as data in a format that can be printed on a document or the like.

According to the present invention, the operation set values of the two upstream and downstream voltage regulators 300 are set to values that minimize the number of times of hunting and the voltage deviation time. According to the operation of the distribution system reflecting this result, the voltage ends within the allowable range with a smaller number of times of hunting. For example, in the conventional case, the voltage converges within the allowable range by the series of tap operations shown in FIG. 20, but in the case of the present invention, the number of tap operations can be reduced, so that FIG. 20 (b) to FIG. c) It can be expected that the process proceeds directly to FIG. 20E without going through the process of FIG. 20D.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a recording device such as a hard disk or SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

100: Distribution system 110: Distribution substation 120: Node 130: Substation bus 140: Distribution line 150: Generator 160: Sensor 170: Load 200: Communication network 300: Voltage regulator 310: Single voltage transformer and tap changer Configured transformer 320: control unit 330: communication unit 10: equipment plan support device 11: display device 12: input means 13: CPU
14: Communication means 15: RAM
DB1: Measurement database DB2: Equipment database DB3: Power flow calculation result database DB4: Tap database DB5: Voltage deviation time calculation database DB6: Settling database DB7: Program database

Claims (9)

Distribution system in which a plurality of voltage regulators for adjusting taps of the transformer with taps are arranged in series when the integral value of the voltage at which the secondary voltage of the transformer with taps deviates from the allowable range exceeds the operation set value Equipment planning support apparatus,
The equipment plan support device includes a plurality of combinations of operation set values of the voltage adjust devices for the upstream voltage adjust device and the downstream voltage adjust device. A settling database that stores the number of times of hunting that represents a series of actions that repeats tap adjustment with each other, a combination of action settling values read from the settling database, and a combination of the action settling values based on the corresponding number of huntings and operation setting value settling processing unit for calculating the capital planning support system of the distribution system, characterized in that it comprises a display unit for displaying the operation setting value and hunting times the operation setting value settling section is calculated. A facility planning support apparatus for a power distribution system according to claim 1,
The settling database obtains a voltage deviation time at the time of a combination of the respective operation settling values from a past operation record and stores it together with the hunting count, and the operation settling value settling processing unit reads out the operation settling from the settling database. Based on the combination of values, the corresponding hunting times and voltage deviation time, the combination of the operation set values is calculated, and the display unit is a combination of the operation set values calculated by the operation set value set processing unit, the number of hunting times And an equipment plan support device for a distribution system, characterized by displaying a voltage deviation time. A facility planning support device for a power distribution system according to claim 2,
The operation set value setter obtains an evaluation value based on the number of times of hunting and the voltage deviation time for each combination of the operation set values, and uses the evaluation value to select one of the combinations of the operation set values. A facility planning support device for a power distribution system, characterized in that a combination of operation set values of a set is calculated. A facility planning support device for a power distribution system according to claim 3,
The settling database includes the upper limit value of the hunting count and the voltage deviation time, and the operation settling value setter is limited to the hunting count and the upper limit value of the voltage deviation time in calculating the evaluation value. A facility planning support device for a distribution system, characterized in that A facility planning support device for a power distribution system according to claim 4,
The operation set value setting processing unit outputs an upper limit value change command when there is no operation set value that is less than or equal to the upper limit value of the number of times of hunting and voltage deviation time. . A facility planning support apparatus for a power distribution system according to any one of claims 1 to 5,
The voltage adjustment device is a device that adjusts the number of connected reactors and capacitors by tap switching. Distribution system in which a plurality of voltage regulators for adjusting taps of the transformer with taps are arranged in series when the integral value of the voltage at which the secondary voltage of the transformer with taps deviates from the allowable range exceeds the operation set value Equipment planning support apparatus,
The facility planning support device reads from the measurement database a measurement database that stores the measured values of the distribution system of a plurality of time sections, a line constant of the distribution system, a system configuration, and a set value of the voltage regulator. A power flow calculation processing unit for estimating a voltage distribution of the power distribution system based on measured values of a plurality of cross sections, a line constant of the power distribution system read from the equipment database and a system configuration, and a voltage distribution calculated by the power flow calculation processing unit A tidal current calculation result database, a tap command calculation processing unit for calculating the tap number of the voltage regulator based on the voltage distribution read from the tidal current calculation result database and the set value of the voltage regulator read from the equipment database A tap database that stores the tap number calculated by the tap command calculation processing unit; A hunting frequency calculation processing unit that calculates the hunting frequency based on the tap number of a plurality of time sections read from the tap database, and a voltage deviation time calculation process that calculates the voltage deviation time based on the voltage distribution read from the power flow calculation result database Section, the voltage regulator on the upstream side of the power distribution system, and the voltage regulator on the downstream side are provided with a plurality of combinations of operation set values of each voltage adjuster, and the number of times of hunting and voltage deviation time when each set of operation set values is combined and settling database stores are a combination of operation setting value read from該整constant database, based on the corresponding hunting frequency and voltage deviation time, the operation setting value settling processing unit for calculating the combination of the operation setting value the operation setting value and hunting times the operation setting value settling processing unit has calculated Facilities planning support system of the distribution system, characterized in that it comprises a Shimesuru display unit. A facility planning support device for a power distribution system according to claim 7,
The operation set value settling processing unit obtains an evaluation value by weighting and adding the hunting count and the voltage deviation time when the operation set values are combined, and the evaluation is performed from among the combinations of the operation set values. A facility planning support apparatus for a power distribution system, which calculates a combination of a set of operation set values that minimize the value. Distribution system in which a plurality of voltage regulators for adjusting taps of the transformer with taps are arranged in series when the integral value of the voltage at which the secondary voltage of the transformer with taps deviates from the allowable range exceeds the operation set value The equipment plan support method of
For the upstream voltage regulator and downstream voltage regulator, there are multiple combinations of operation setting values for each voltage regulator, and the number of hunting times and voltage deviation time for each operation set value combination are operated in the distribution system. A set that is obtained from the actual results, obtains an evaluation value by weighting and adding the number of times of hunting corresponding to the combination of each operation set value and the operation set value, and the evaluation value is minimized from the combination of each operation set value A facility planning support method for a distribution system, characterized in that a combination of operation settling values is calculated.

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