JP5874375B2 - Signal generation apparatus, program, and signal generation method - Google Patents

Description

  The present invention relates to a signal generation device, a program, and a signal generation method.

  Under the Electricity Business Law Enforcement Regulations, it is stipulated that the receiving end voltage of each consumer is maintained within a range of 101 ± 6V or 202 ± 20V. In addition, there is no legal rule for systems with high voltage or higher, but the power company is responsible for maintaining the proper voltage. For example, in a power distribution system, various voltage adjusting devices are installed in order to maintain the voltage within an appropriate range. Voltage regulators are devices that adjust the voltage by operating the transformer ratio, such as load ratio control transformer (LRT) and step voltage regulator (SVR). It can be broadly divided into devices that adjust the voltage by operating reactive power such as capacitors, shunt reactors, and SVC (Static Var Compensator). Currently, each of these voltage regulators operates based on its own information (own voltage control).

  However, with self-end voltage control, it is difficult to optimize the entire distribution system voltage, so if the introduction of distributed power sources that use natural energy such as photovoltaic (PV) into the distribution system will continue, Otherwise, the voltage may deviate from the proper range due to output fluctuation.

  Therefore, the supervisory control device is connected to the sensors and voltage regulators in the target system via the communication means, and the supervisory control device collects system and device information in a lump, and performs calculations based on the information to control commands. Concentrated voltage that derives the value and sends the derived control command value to each voltage regulator, and each voltage regulator operates based on the control command value from the supervisory controller to optimize the entire distribution system voltage Control has been proposed (see, for example, Patent Documents 1 and 2).

  By the way, among the voltage regulators, LRT and SVR are particularly excellent in voltage regulation with respect to wide-range and long-cycle load / distributed power supply output fluctuation, and are positioned as main voltage regulators in voltage regulation of the distribution system. . However, on the other hand, when tap switching is performed, there is a problem that the life of the device is shortened due to wear of the contacts of the tap switch.

  Therefore, with respect to the control range targeted by LRT and SVR, the voltage at each point in the distribution system falls within the appropriate range based on the predicted power consumption of each customer and the generated power of each distributed power source in each future time section. Based on the above constraint, a method has been proposed in which tap transitions (tap plan values) that realize a reduction in the number of tap switching times of LRT and SVR are derived and controlled based on the tap plan values (see Non-Patent Document 1, for example). ).

JP 2008-278658 A JP 2009-65788 A

Yasuhiro Hayashi, 3 others, "Determination of optimal transmission voltage in distribution system with distributed power supply", IEEJ Journal B, 2005, 125, 9, 844-854

  In centralized voltage control including LRT and SVR, for example, using the technology of Patent Literature 1 and Patent Literature 2, if tap switching is performed so that the voltage at each point of the distribution system always approaches the center of the appropriate range, tap switching is performed. The number of times may increase.

  On the other hand, for example, as described in Non-Patent Document 1, when LRT and SVR are operated based on the planned tap value in consideration of the reduction in the number of tap switching, the distribution system is not used when the load / distributed power output prediction is lost. There is a concern that the voltage deviates from the proper range.

  As described above, prevention of deviation from the proper range of the distribution system voltage in each time section and reduction of the number of tap switching in the long-term time section may be contradictory requirements depending on the time section. However, even in the case of conflicting requests, a method for appropriately deriving a tap command value according to the situation has not been established.

  The present invention has been made in view of the above problems, and a signal generation device, a program, and a signal capable of preventing the system voltage from deviating from an appropriate range while suppressing the number of tap switching of the voltage regulator. An object is to provide a generation method.

  To achieve the above object, according to one aspect of the present invention, a voltage regulator for switching a plurality of taps to boost or step down a voltage at a predetermined position of an electric power system for selecting any of the plurality of taps. A signal generation device that generates an instruction signal includes: a tap switching range in which a current voltage at the predetermined position can be a voltage within a predetermined range; and a position of each tap of the plurality of taps. A first position of the tap for setting a current voltage at a predetermined position to a predetermined level within the predetermined range, and a second of the tap obtained based on a predetermined plan for suppressing the number of tap switching. And an acquisition unit that acquires the third position of the currently selected tap, and among the first to third positions, the first position, and the second and third positions Out of If at least one of the positions is included in the switching range of the tap, among the first to third positions, the position at which the voltage at the predetermined position is the highest and the voltage at the predetermined position are A generator that generates the instruction signal for causing the voltage regulator to select the tap at a position between the lowest position and the tap.

  It is possible to provide a signal generation device, a program, and a signal generation method capable of preventing the system voltage from deviating from an appropriate range while suppressing the number of tap switching times of the voltage regulator.

1 is a diagram showing an outline of a power system 10. FIG. It is a figure for demonstrating the outline | summary of LRT20. It is a figure which shows an example of a structure of the command value production | generation apparatus 60. FIG. It is a figure which shows the functional block implement | achieved by the command value production | generation apparatus 60. FIG. It is a figure for demonstrating the state where only the tap optimal value existed in the tap which can be selected among tap optimal value, tap plan value, and tap present value. It is a figure which shows an example in case a tap optimal value turns into a tap command value. It is a figure which shows an example in case a tap optimal value turns into a tap command value. It is a figure which shows an example in case a tap plan value turns into a tap command value. It is a figure which shows an example in case a tap plan value turns into a tap command value. It is a figure showing an example in case a tap present value turns into a tap command value. It is a figure showing an example in case a tap present value turns into a tap command value. It is a figure which shows an example in case the value of a tap optimal value and a tap present value becomes a tap command value. It is a figure which shows an example in case the value of a tap plan value, a tap optimal value, and the tap present value becomes a tap command value. 4 is a flowchart illustrating an example of processing executed by a command value generation device 60. It is a figure which shows the outline | summary of the electric power grid | system 11 to which the command value production | generation apparatus 60 is applied. It is a figure which shows an example of the time transition of the selectable tap obtained in the command value production | generation apparatus 60, a tap optimal value, a tap plan value, and a tap command value. It is a figure which shows an example of the time transition of the selectable tap obtained in the command value production | generation apparatus 60, a tap optimal value, a tap plan value, and a tap command value. It is a figure which shows the functional block implement | achieved by the command value production | generation apparatus 65. FIG. It is a figure for demonstrating the state to which a tap command value is shifted. It is a figure for explaining the state where a tap command value does not change. 7 is a flowchart illustrating an example of processing executed by a command value generation device 65. It is a figure which shows an example of the time transition of the selectable tap obtained in the command value production | generation apparatus 65, a tap optimal value, a tap plan value, and a tap command value.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

<< About the outline of the electric power system 10 >>
FIG. 1 is a diagram showing an outline of the power system 10. The power system 10 includes a bus 15, LRT 20, SVR 21 and 22, sensor switches 30 to 39, transformers 40 to 48, loads (customer loads) 50 to 53, power sources (distributed power sources) 55 to 58, and command values It is comprised including the production | generation apparatuses 60-62.

  LRT 20 transforms the voltage from the power transmission system and supplies it to bus 15. Sensor switches 30 to 32 are provided between the bus 15 and the SVR 21, and sensor switches 33 to 35 are provided between the bus 15 and the SVR 22.

  The sensor switches 30 to 39 are switches provided with a current sensor and a voltage sensor (not shown). Here, it is assumed that all of the sensor switches 30 to 39 are turned on (closed). Therefore, each of the loads 50 to 53 is connected to the power system 10 via the transformers 40 to 43, and each of the power supplies 55 to 58 is connected via the transformers 45 to 48. The power sources 55 to 58 are, for example, a solar power generation facility or a wind power generation facility.

  FIG. 2 is a diagram for explaining the outline of the LRT 20. The LRT 20 includes distribution lines 80 and 81, an adjustment transformer 82, a load tap changer 83, and a drive device 84.

  The distribution line 80 is an electric wire connected to the primary side of the adjustment transformer 82, and a voltage from the power transmission system is applied. The distribution line 81 is an electric wire connected to the secondary side (bus 15 side) of the adjustment transformer 82. The adjustment transformer 82 is a single-winding transformer having ten taps t1 to t10, for example.

  The on-load tap changer 83 is a device that switches the tap of the adjustment transformer 82. In the present embodiment, for example, when the on-load tap changer 83 switches the tap from the tap t10 to the t1 direction, the voltage of the distribution line 81 is boosted. On the other hand, when the load tap changer 83 switches the tap from the tap t1 to the t10 direction, the voltage of the distribution line 81 is lowered.

  The drive device 84 is a device for causing the on-load tap changer 83 to perform a tap switching operation based on the tap command value from the command value generation device 60. For example, when a tap command value S1 for selecting the tap t5 is input, the driving device 84 controls the on-load tap switch 83 so that the tap t5 is selected.

  In addition, since SVR21 and 22 in this embodiment are the same as that of LRT20, detailed description is abbreviate | omitted. However, the SVR 21 operates based on the tap command value S2 from the command value generation device 61, and the SVR 22 operates based on the tap command value S3 from the command value generation device 62.

  The command value generation device 60 (signal generation device) includes, for example, outputs (current and voltage) from sensor switches 30 to 35 distributed in the power system 10, power consumption of loads 50 and 51, and power sources 55 and 56. The tap command value S1 (instruction signal) for instructing the tap position of the LRT 20 is output based on the amount of power generated. The command value generation device 60 includes a storage device 90 and a CPU 91 as shown in FIG. 3, for example.

  The storage device 90 stores program data executed by the CPU 91 and various data. The CPU 91 implements various functional blocks in the command value generation device 60 by executing the program data stored in the storage device 90. Specifically, as shown in FIG. 4, the command value generation device 60 implements a calculation unit 100 and a command value output unit 101.

  For example, the calculation unit 100 calculates various values related to the tap position in the LRT 20. The calculation unit 100 includes a selectable tap calculation unit 110, an optimum value calculation unit 111, and a plan value calculation unit 112.

  The selectable tap calculation unit 110 calculates the range of selectable taps by the LRT 20. Here, the selectable tap measures the current power consumption of each consumer (loads 50 and 51) and the generated power of each distributed power source (power sources 55 and 56) in the control range targeted by the LRT 20, or When a tap of the LRT 20 is estimated and operated, it is determined whether or not each point voltage can be maintained in an appropriate range in the control range targeted by the LRT 20, and tap candidates determined to be able to maintain the appropriate range at the present time (There may be multiple cases). Note that if any point voltage deviates from the appropriate range regardless of how the LRT 20 tap is operated, the tap that can be selected in each time section, such as selecting the tap with the smallest deviation amount, is selected. There must be at least one stage. In addition, the voltage at each point (predetermined position) to be maintained within an appropriate range (predetermined range) is, for example, the received voltage of the load 50 (the load 50 is connected to the transmission lines of the sensor switches 30 and 31 via the transformer 40). Node voltage). The selectable tap derivation method is disclosed in Non-Patent Document 1, for example.

  The optimum value calculation unit 111 calculates a tap optimum value indicating the optimum tap position (first position) among taps that can be selected by the LRT 20. Here, the tap optimum value refers to measuring the current power consumption of each consumer (loads 50 and 51) and the generated power of each distributed power source (power sources 55 and 56) in the control range targeted by the LRT 20, or It is estimated and the optimum tap position at the present time is obtained in consideration of maintenance of an appropriate voltage. However, depending on the power consumption of each consumer that changes from time to time and the generated power of each distributed power source, the optimum tap value changes frequently, which may be a problem in terms of the number of tap switching. Note that the tap optimum value is always included in the selectable taps. For example, if any of the voltages at each point deviates from an appropriate range regardless of how the tap of the LRT 20 is operated, the only tap position selected as a selectable tap is selected as the tap optimum value. Further, when the optimum tap position is selected in the LRT 20, the power reception voltage of the load 50 is, for example, the center level of an appropriate range (predetermined range). The tap optimum value derivation method is disclosed in, for example, Patent Document 1 and Patent Document 2.

  The plan value calculation unit 112 calculates a tap plan value indicating the tap position (second position) based on a predetermined plan for suppressing the number of tap switching. The tap plan value predicts the power consumption of each future customer (loads 50 and 51) and the power generation of each distributed power source (power sources 55 and 56) for the control range targeted by the LRT 20, and determines the appropriate voltage. The optimum tap transition is obtained from a long-term viewpoint in consideration of maintenance, reduction of tap switching frequency, and the like. In the control, the tap plan value of the corresponding time section is used. However, even if the relevant tap plan value is selected at the present time, there is a case where the prediction is lost, so that the voltage at each point cannot always be maintained within the appropriate range. That is, the tap plan value is not always included in the selectable taps. The tap plan value derivation method is disclosed in Non-Patent Document 1, for example. In addition, the tap plan value may be preset (procon system), given as a schedule, or may be obtained as needed based on prediction (daily or hourly). The plan value calculation unit 112 calculates the plan value based on, for example, a process control method.

<<< Tap command value derivation method >>>
Here, based on the selectable tap, the tap optimum value, the tap planned value, and the tap current value calculated by the calculation unit 100, a tap command value (tap position to be selected by the LRT 20) is derived (selection). (Method) will be described. The tap current value is a value indicating the current tap position (third position) in the LRT 20. If the current tap value is continuously selected as the tap command value, the number of tap switching is minimized. However, since the power consumption of each consumer (loads 50 and 51) and the generated power of each distributed power source (power supplies 55 and 56) change from moment to moment, even if the tap current value is selected at this time, the voltage at each point Cannot always be maintained within the proper range. That is, the tap current value is not necessarily included in the selectable taps.

  FIG. 5 is a diagram for explaining a state where only the optimum tap value exists among the selectable taps among the optimum tap value, the planned tap value, and the current tap value. In FIG. 5, for example, the selectable taps are t3 to t5, the tap current value is the tap t2, the tap optimum value is the tap t4, and the tap planned value is the tap t6. In such a case, the tap optimum value is selected as the tap command value. This is because if a tap candidate value that is not a selectable tap is selected, the voltage at each point cannot maintain an appropriate range.

  Next, a case where a plurality of tap candidate values among the tap optimum value, the tap planned value, and the tap current value exist among the selectable taps will be described.

  First, as shown in FIG. 6, a case where the tap candidate value located at the center is the tap optimum value is considered. Here, for example, the selectable taps are t3 to t6, the tap current value is the tap t3, the tap optimum value is the tap t4, and the tap planned value is the tap t5. In this case, the current optimum value (tap optimum value) and the long-term optimum value (tap planned value) are in the same tap direction (direction of tap t10, for example, step-down direction), compared with the current tap value. One of the tap optimum value and the tap planned value should be selected. Whether or not the tap planned value should be selected is determined by looking at future transitions. In this case, the optimum tap value that is the current optimum value is selected. In FIG. 6, the optimum tap value and the planned tap value are in the tap t10 direction (step-down direction). However, for example, as shown in FIG. 7, even when the tap is in the tap t1 direction (step-up direction). The same. That is, even in the case of FIG. 7, the tap optimum value which is the optimum value at the present time is selected.

  Next, as shown in FIG. 8, a case is considered in which the tap candidate value located at the center is the tap planned value. In FIG. 8 and the like below, the position of the tap (for example, t5 and the like) with respect to each value (for example, the tap optimum value) is omitted for convenience, but is the same as FIG. 6 and the like described above. In this case, the current optimal value (tap optimal value) and the long-term optimal value (tap planned value) are in the same tap direction as compared with the tap current value. Should be selected. When the optimum tap value is selected, over-control occurs in the long term, and the tap switching frequency may increase. In this case, the tap plan value that is the long-term optimum value is selected. In the case of FIG. 9 as well, the tap plan value that is the long-term optimum value is selected as in the case of FIG.

  Finally, as shown in FIGS. 10 and 11, consider a case where the tap candidate value located at the center is the current tap value. In this case, the current tap value is selected because the current optimum value (tap optimum value) and the long-term optimum value (tap planned value) are in different tap directions and the trend cannot be determined.

  To summarize the above results, if there are multiple tap candidate values of tap optimum value, tap plan value, tap current value among selectable taps, tap optimum value, tap plan value, tap current value The tap candidate value whose tap position is located in the center is selected. That is, a value between a value that makes the secondary side voltage of the LRT 20 the highest and a value that makes the secondary side voltage of the LRT 20 the lowest is selected. Here, in FIG. 6 to FIG. 11, it is assumed that the selectable tap includes three tap optimum values, tap planned values, and tap current values. The same applies to the case where one of the tap planned value and the tap current value and the tap optimum value are included.

  In addition, as shown in FIGS. 12 and 13, among the selectable taps, any one of the tap optimum value, the tap planned value, and the current tap value exists, and two or more of the tap candidate values are the same. When it overlaps with the tap value, the overlapped tap candidate value is regarded as the median value and the tap candidate value is selected. That is, for example, in the case of FIG. 12, the tap optimum value and the tap current value are selected as the tap command values.

<<<< Function Blocks for Deriving Tap Command Values >>>>
The command value output unit 101 realized in the command value generation device 60 of FIG. 4 executes the tap command value derivation method described above, and generates a tap command value S1 for causing the LRT 20 to select a tap corresponding to the tap command value. Output. The command value output unit 101 includes an acquisition unit 120, determination units 121 and 122, a selection unit 123, and an output unit 124.

  The acquisition unit 120 acquires the selectable tap, the tap optimum value, the tap plan value, and the tap current value calculated by the calculation unit 100.

  The determination unit 121 (first determination unit) determines whether or not only a tap optimum value exists in a selectable tap (selectable tap switching range).

  When the selectable tap includes a plurality of values, the determination unit 122 (second determination unit) determines whether the tap optimum value, the tap planned value, and the tap current value are different from each other, that is, the tap optimum value. It is determined whether or not a plurality of values are the same among the tap planned value and the tap current value.

  The selection unit 123 (generation unit) selects the tap command value based on the above-described tap command value derivation method while using the value acquired by the acquisition unit 120 and the determination results of the determination units 121 and 122.

  The output unit 124 outputs the tap command value selected by the selection unit 123 to the LRT 20 as the tap command value S1.

<<<< Example of Processing Performed by Command Value Generating Device 60 >>>>
FIG. 14 is a diagram illustrating an example of processing executed when the command value generation device 60 outputs the tap command value S1 to the LRT 20.

  First, the acquisition unit 120 acquires the selectable tap, the tap optimum value, the tap plan value, and the tap current value calculated by the calculation unit 100 (S100). Then, the determination unit 121 determines whether or not only the tap optimum value exists in the selectable tap (selectable tap switching range) (S101). When only the tap optimal value exists in the selectable tap (S101: YES), the selection unit 123 selects the tap optimal value as the tap command value (S102). On the other hand, when a value other than the optimum tap value exists in the selectable tap (S101: NO), the determination unit 122 determines whether there is the same value (duplicate value) in the optimum tap value, the planned tap value, and the current tap value. Is determined (S103). When there is no overlapping value (S103: NO), the selection unit 123 taps the value of the center tap position among the tap position of the tap optimum value, the tap position of the tap planned value, and the tap position of the tap current value. The value is selected (S104). If there is an overlapping value (S103: YES), the selection unit 123 selects the value of the overlapping value as a tap command value (S105). Then, the output unit 124 outputs the tap command value selected by the selection unit 123 to the LRT 20 as the tap command value S1 (S106). As a result, the LRT 20 selects the tap specified by the tap command value S1.

  In addition, although the detail of the command value generation apparatus 60 was demonstrated here, the command value generation apparatuses 61 and 62 are the same, for example. That is, the command value generation devices 61 and 62 also execute the same processing as the command value generation device 60, and output the tap command values S2 and S3 to the SVRs 21 and 22, respectively. For this reason, the SVRs 21 and 22 also select taps specified by the tap command values S1 and S2.

<<< Example in which the command value generating device 60 is applied to the power system 11 >>>
FIG. 15 is a diagram illustrating an example in which the command value generation device 60 is applied to the power system 11. It is assumed that the SVR 21 and 22 provided in the power system 10 of FIG. 1 are not installed in the power system 11. Moreover, since each block of the electric power system 11 is the same as each block of the electric power system 10, detailed description is abbreviate | omitted. However, the command value generating device 60 includes information (voltage, current) from the sensor switches 30 to 39 in the power system 11, information on the loads 50 to 53 (power consumption, etc.), information on the power sources 55 to 58 (power generation). Input). And the command value production | generation apparatus 60 performs the process illustrated in FIG. 14 using the various information input, and produces | generates a tap command value.

  FIG. 16 is a diagram illustrating temporal transitions of selectable taps, tap optimum values, tap plan values, tap current values, and tap command values obtained in the command value generating device 60. Here, the selectable tap is represented by a black frame (for example, taps t5 to t7 at time T1), the tap optimum value is represented by a double circle, the tap planned value is represented by a circle, and the tap command value is represented by a black circle. It is represented. The tap command value is the current tap value at the next time. Furthermore, the tap optimum value is the center value of the selectable tap switching range (selectable tap).

  For example, at time T2, since the tap optimum value, tap planned value, and tap current value (tap command value at time T1) are all the same value “6” (value indicating tap t6), the tap command value at time T2 Is also “6”. For this reason, when the time T2 changes to time T3, the tap current value becomes “6”. However, since the tap optimum value and the tap planned value obtained at time T3 are both “4”, the tap command value is “4” as a result. Thus, at each time, the tap command value is selected based on the tap optimum value, the tap plan value, and the tap current value (tap command value at the previous time).

  As shown in FIG. 16, since the tap command value is within the selectable tap range at any time section, the voltage at each point of the distribution system can be maintained within the appropriate range. Furthermore, by selecting a tap position having a margin above and below among selectable taps, it is possible to secure a voltage margin for the upper and lower limits of the appropriate range.

  Moreover, the tap switching frequency of the tap optimum value is 12 times in total. The 12 times are from time T2 to T3, once from time T5 to time T6, once from time T6 to time T7, once from time T8 to time T9, once from time T9 to time T10, This is the total of 6 times from time T10 to time T15. On the other hand, the number of tap switching of the tap command value is 6, and the number of tap switching can be reduced.

  FIG. 17 is a diagram illustrating a tap plan value when the current power consumption of each consumer and the prediction accuracy of the generated power of each distributed power source are poor, and changes in tap command values based on the tap plan value. That is, the tap plan value in FIG. 17 is a value obtained so that the tap switching frequency is smaller than the tap plan value in FIG. Here, “6” is always output as the tap plan value.

  As shown in FIG. 17, since the tap command value is within the selectable tap range at any time section, the voltage at each point of the distribution system can be maintained within the appropriate range.

  Further, the tap switching value of the tap command value is 6 times with respect to the tap switching number of 12 times of the optimum tap value, and the tap switching frequency can be reduced even when the accuracy of the tap plan value is slightly low.

=== Other Embodiments of Command Value Generating Device ===
From the result of FIG. 17, it can be seen that there is a time section (for example, times T3, T10, T15) for selecting the tap positions at the upper and lower ends of the selectable taps as tap command values. This indicates that although the voltage at each point of the distribution system is within the appropriate range, the voltage tolerance with respect to the upper and lower limits of the appropriate range is becoming strict. This phenomenon is likely to occur when the accuracy of the tap plan value is low. The command value generation device 65 shown in FIG. 18 is a device that generates a tap command value that can prevent the voltage tolerance from becoming severe.

  In the command value generating device 65, a command value output unit 105 is realized instead of the command value output unit 101 realized by the command value generating device 60. 18 and FIG. 4 are the same except that the command value output unit 105 is provided with determination units 130 and 131 and a correction unit 132.

  The determination unit 130 (third determination unit) determines whether the tap positions of the upper and lower selectable taps are selected as tap command values, and the determination unit 131 (fourth determination unit) determines whether the selectable tap is selected. It is determined whether there are three or more levels.

  The correction unit 132 corrects the tap command value selected by the selection unit 123 when the tap positions of the upper and lower selectable taps are selected as tap command values and there are three or more selectable taps. Specifically, as illustrated in FIG. 19, a value obtained by moving the tap command value selected by the selection unit 123 toward the center of the selectable tap by one tap is set as the tap command value. As shown in FIG. 20, the correction unit 132 does not correct the tap command value selected by the selection unit 123 when the selectable taps are less than three stages.

  The output unit 124 outputs the tap command value selected by the selection unit 123 or the tap command value corrected by the correction unit 123.

<<<< Example of Processing Performed by Command Value Generating Device 65 >>>>
FIG. 21 is a diagram illustrating an example of processing executed when the command value generation device 65 outputs the tap command value S1 to the LRT 20. Here, the description regarding the processes S100 to S105 is the same as the process shown in FIG.

  First, when the selection unit 123 selects a tap command value (processing S102, S104, S105), the determination unit 130 determines that the tap position of the selected tap command value is the tap position of the upper and lower ends (both ends) of the selectable tap. (S200). When the tap positions of the selected tap command value are the tap positions of the upper and lower ends of the selectable tap (S200: NO), the determination unit 131 determines whether there are three or more selectable taps ( S201). If there are three or more selectable taps (S201: YES), the correction unit 132 shifts the selected tap command value toward the center (moves by one tap) (S202). The output unit 124 outputs the tap command value shifted to the center side as the tap command value S1 (S203).

  On the other hand, when the tap position of the selected tap command value is not the tap position of the upper and lower ends of the selectable tap (S200: NO), or when there are three or more selectable taps (S201: NO), the output unit 124 outputs the tap command value selected by the selection unit 123 as the tap command value S1 (S203).

  By executing such processing, even when the accuracy of the tap planned value is low, it is possible to ensure a voltage margin for the upper and lower limits of the appropriate range.

<<< Example in which the command value generating device 65 is applied to the power system 11 >>>
Here, the Example at the time of applying the command value production | generation apparatus 65 to the electric power grid | system 11 shown in FIG. 15 is demonstrated.

  FIG. 22 is a diagram illustrating a time transition of the selectable tap, the tap optimum value, the tap plan value, the tap current value, and the tap command value obtained in the command value generation device 65. Here, “6” is always output as the tap plan value.

  As shown in FIG. 22, since the tap command value is within the selectable tap range at any time section, the voltage at each point of the distribution system can be maintained within the appropriate range. In FIG. 17, the upper and lower ends of the selectable tap may be selected as the tap command value, and a time section is generated in which the voltage tolerance for the appropriate range becomes severe. In FIG. 22, the upper and lower ends of the selectable tap are possible. By not selecting as much as possible, it is possible to secure a voltage margin for the upper and lower limits of the appropriate range even when the accuracy of the tap plan value is slightly low. Further, the tap switching number of the tap command value is 7 times with respect to the tap switching number of 12 tap optimum values, and the tap switching number can be reduced even when the accuracy of the tap planned value is slightly low.

  The command value generation devices 60 and 65 of this embodiment have been described above. The command value generation devices 60 and 65 can prevent the system voltage from deviating from the appropriate range while suppressing the tap switching frequency of the LVR 20 (voltage adjustment device).

  Further, when only the tap optimum value is included in the selectable tap range, the tap optimum value is immediately selected as the tap command value. For this reason, useless processing of the CPU 91 can be suppressed.

  For example, when there are overlapping values among the tap optimum value, the tap planned value, and the tap current value, the overlapping value is selected as the tap command value. Therefore, even in such a case, it is possible to prevent the system voltage from deviating from the appropriate range while suppressing the number of tap switching of the LVR 20.

  Further, when the tap position of the selected tap command value is the tap position of the upper and lower ends of the selectable tap, the selected tap command value is shifted to the center side. For this reason, even when the accuracy of the tap planned value is low, it is possible to ensure a voltage margin for the upper and lower limits of the appropriate range.

  In addition, the said Example is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In FIG. 1, command value generation devices 61 and 62 are provided to control the SVRs 20 and 21. For example, the command value generation device 60 controls all the voltage regulators (LVR20, SVR21 and 22). May be. That is, a plurality of voltage adjustment devices may be controlled by one command value generation device 60.

10, 11 Power system 15 Bus 20 LRT
21,22 SVR
30 to 39 Sensor switch 40 to 48 Transformer 50 to 53 Load 55 to 58 Power supply 60 to 62, 65 Command value generator 80, 81 Distribution line 82 Adjusting transformer 83 On-load tap changer 84 Drive equipment 90 Storage device 91 CPU
DESCRIPTION OF SYMBOLS 100 Calculation part 101 Command value output part 110 Selectable tap calculation part 111 Optimal value calculation part 112 Plan value calculation part 120 Acquisition part 121,122,130,131 Determination part 123 Selection part 124 Output part 132 Correction part

Claims (12)

A signal generation device that generates an instruction signal for causing a voltage adjustment device that switches a plurality of taps to step up or step down a voltage at a predetermined position of a power system to select any of the plurality of taps,
The tap switching range in which the current voltage at the predetermined position can be a voltage within a predetermined range, and the current voltage at the predetermined position among the tap positions of the plurality of taps is the predetermined range. A first position of the tap for a predetermined level, a second position of the tap obtained based on a predetermined plan for suppressing the number of tap switching, and the currently selected An acquisition unit for acquiring a third position of the tap;
Of the first to third positions, when the first position and at least one of the second and third positions are included in the switching range of the tap, Among the first to third positions, for causing the voltage regulator to select the tap at a position between a position where the voltage at the predetermined position is highest and a position where the voltage at the predetermined position is lowest. A generating unit for generating the instruction signal;
A signal generation device comprising: The signal generation device according to claim 1,
A first determination unit that determines whether a position other than the first position among the first to third positions is included in the tap switching range;
The generator is
The instruction for causing the voltage regulator to select the tap at the first position when the first determination unit determines that a position other than the first position is not included in the tap switching range. When the first determination unit generates a signal and determines that a position other than the first position is included in the switching range of the tap, the predetermined position among the first to third positions is determined. Generating the instruction signal for causing the voltage regulator to select the tap at a position between a position where the voltage is highest and a position where the voltage at the predetermined position is lowest;
A signal generator characterized by the above. The signal generation device according to claim 2 ,
When the first determination unit determines that a position other than the first position is included in the tap switching range, at least any two of the first to third positions are the same position. A second determination unit that determines whether or not there is,
The generator is
The instruction for causing the voltage regulator to select the tap at the same position when the second determination unit determines that at least any two positions of the first to third positions are the same position. When the second determination unit generates a signal and determines that at least any two of the first to third positions are not the same position, the predetermined position of the first to third positions is determined. Generating the instruction signal for causing the voltage regulator to select the tap at a position between a position where the voltage is highest and a position where the voltage at the predetermined position is lowest;
A signal generator characterized by the above. The signal generation device according to any one of claims 1 to 3,
A third determination unit that determines whether the positions of the taps selected by the voltage adjustment device based on the instruction signal from the generation unit are positions at both ends in the switching range;
A fourth determination unit for determining whether or not the switching range includes three or more positions;
When the position of the tap selected by the voltage adjustment device based on the instruction signal from the generation unit is the position of the both ends, and the switching range includes three or more positions, the selection is performed by the voltage adjustment device. A correction unit that corrects the instruction signal of the generation unit such that the position of the tap to be shifted to the center side of the switching range;
A signal generation device comprising: A computer that generates an instruction signal for causing a voltage adjusting device that switches a plurality of taps to boost or step down a voltage at a predetermined position of the power system to select any of the plurality of taps.
The tap switching range in which the current voltage at the predetermined position can be a voltage within a predetermined range, and the current voltage at the predetermined position among the tap positions of the plurality of taps is the predetermined range. A first position of the tap for a predetermined level, a second position of the tap obtained based on a predetermined plan for suppressing the number of tap switching, and the currently selected A function to obtain a third position of the tap;
Of the first to third positions, when the first position and at least one of the second and third positions are included in the switching range of the tap, Among the first to third positions, the tap for causing the voltage regulator to select the tap at a position between the position where the voltage at the predetermined position is the highest and the position where the voltage at the predetermined position is the lowest. A function to generate an instruction signal;
A program that realizes The program according to claim 5,
The function of generating the instruction signal is as follows:
A first function for determining whether a position other than the first position among the first to third positions is included in the switching range of the tap;
When it is determined that a position other than the first position is not included in the tap switching range, the instruction signal for causing the voltage regulator to select the tap at the first position is generated. A second function;
When it is determined that a position other than the first position is included in the tap switching range, the position where the voltage at the predetermined position is highest among the first to third positions and the predetermined position A third function for generating the instruction signal for causing the voltage adjusting device to select the tap at a position between the position where the voltage of the position is lowest, and
The program characterized by including. The program according to claim 6,
The third function is:
When it is determined by the first function that the tap switching range includes a position other than the first position, at least any two positions of the first to third positions are the same position. A fourth function for determining whether or not
If it is determined that at least two of the first to third positions are the same position, the instruction signal for causing the voltage regulator to select the tap at the same position is generated. A fifth function;
If it is determined that at least any two of the first to third positions are not the same position, the position where the voltage at the predetermined position is highest among the first to third positions and the predetermined position A sixth function for generating the instruction signal for causing the voltage adjusting device to select the tap at a position between the position where the voltage of the position is lowest,
The program characterized by including. A program according to any one of claims 5 to 7,
In the computer,
A function of determining whether the positions of the taps selected by the voltage regulator based on the instruction signal are positions at both ends in the switching range;
A function for determining whether or not the switching range includes three or more positions;
When the position of the tap selected by the voltage adjustment device based on the instruction signal is the position of both ends, and the switching range includes three or more positions, the tap of the tap selected by the voltage adjustment device A function of correcting the instruction signal so that the position is shifted toward the center of the switching range;
Is further realized. A signal generation method for generating an instruction signal for selecting any of the plurality of taps with respect to a voltage adjusting device that switches a plurality of taps in order to step up or step down a voltage at a predetermined position of a power system,
The tap switching range in which the current voltage at the predetermined position can be a voltage within a predetermined range, and the current voltage at the predetermined position among the tap positions of the plurality of taps is the predetermined range. A first position of the tap for a predetermined level, a second position of the tap obtained based on a predetermined plan for suppressing the number of tap switching, and the currently selected An acquisition step of acquiring a third position of the tap;
Of the first to third positions, when the first position and at least one of the second and third positions are included in the switching range of the tap, Among the first to third positions, the instruction signal that causes the voltage regulator to select the tap at a position between a position where the voltage at the predetermined position is highest and a position where the voltage at the predetermined position is lowest. A generation step for generating
A signal generation method comprising: The signal generation method according to claim 9, comprising:
The generating step includes
A first step of determining whether a position other than the first position among the first to third positions is included in the switching range of the tap;
When it is determined in the first step that a position other than the first position is not included in the tap switching range, the voltage adjusting device is configured to select the tap at the first position. A second step of generating an instruction signal;
When it is determined in the first step that a position other than the first position is included in the tap switching range, the voltage at the predetermined position is the highest among the first to third positions. A third step of generating the instruction signal for causing the voltage regulator to select the tap at a position between the position and the position at which the voltage at the predetermined position is lowest;
A signal generation method comprising: The signal generation method according to claim 10, comprising:
The third step includes
When it is determined in the first step that the tap switching range includes a position other than the first position, at least any two positions of the first to third positions are the same position. A fourth step of determining whether or not
When it is determined in the fourth step that at least any two of the first to third positions are the same position, the voltage adjusting device is configured to select the tap at the same position. A fifth step of generating an instruction signal;
If it is determined in the fourth step that at least any two of the first to third positions are not the same position, the voltage at the predetermined position is the highest among the first to third positions. A sixth step of generating the instruction signal for causing the voltage regulator to select the tap at a position between the position and the position at which the voltage at the predetermined position is lowest;
Including,
A signal generation method characterized by the above. A signal generation method according to any one of claims 9 to 11, comprising:
A first determination step of determining whether the positions of the taps selected by the voltage regulator based on the instruction signal are positions at both ends in the switching range;
A second determination step of determining whether or not the switching range includes three or more positions;
When the position of the tap selected by the voltage adjustment device based on the instruction signal is the position of both ends, and the switching range includes three or more positions, the tap of the tap selected by the voltage adjustment device A correction step for correcting the instruction signal so that the position is shifted toward the center of the switching range;
A signal generation method, further comprising:

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