JP2011101566A - Method for eliminating voltage imbalance of three-phase power distribution line and information processing apparatus used for this method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a voltage imbalance of a three-phase power distribution line within an actual scope while taking cost restrictions into consideration. <P>SOLUTION: A method includes the steps of: finding for each phase of the three-phase power distribution line the total power generation capacity as the total of the power generation capacity of a single-phase generator connected to an existing transformer and the power generation capacity of a single-phase generator connected to a new transformer; generating a first type in which the new transformer is connected to the phase having the minimum total power generation capacity; finding the maximum value of the difference of the first total power generation capacity as the maximum value of the difference in the total power generation capacity of each phase in the first type; generating a second type in which the connection phase is transferred for each of the existing transformer and the new transformer; finding the maximum value of the difference in the total power generation capacity for each phase for each second type; finding the maximum value of the difference in the second total power generation capacity which is the minimum value therein; generating a third type in which the phase is transferred in the power distribution line; finding the maximum value of the difference in the total power generation capacity per phase for each third type; finding the maximum value of the difference in the third total power generation capacity which is the minimum value therein; and specifying a type having the minimum value in the maximum value of the difference in the first-third total power generation capacities. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for eliminating voltage imbalance in a three-phase distribution line, and an information processing apparatus used in this method.

  The voltage imbalance of the three-phase distribution line, which is one of the power quality indicators, causes factors such as a decrease in equipment utilization rate and an increase in voltage drop on the distribution system side. On the other hand, on the customer side, induction motor heating and efficiency It becomes a factor such as reduction, torque reduction, and output limitation. For this reason, various measures are taken to eliminate the voltage imbalance.

  For example, Patent Document 1 discloses a disconnection point of a cutting phase of a distribution line in order to prevent an excitation inrush current generated in a distribution system when switching a connection phase of a load performed to reduce three-phase imbalance. The first switch is mounted in parallel, and the contactless switch that closes at high speed following the opening of the first switch between the point on the load side of the cutting point and the switching phase, and the second switch in parallel with this In a phase switching device equipped with two switches, a voltage detection means is provided in the switching phase, and a contactless switch when the voltage of the switching phase first reaches a peak value of a sine wave after the first switch is opened It is described that a control device is provided to input the.

  Patent Document 2 discloses a measurement information database that stores measurement information of a plurality of time sections of a distribution system, a facility information database that stores a system configuration and line impedance of the distribution system, a load rated capacity of the distribution system, and a plurality of hours. Load information database that stores the load demand rate of the cross section, upper and lower limits for calculating the upper and lower limit values of the line voltage change amount and the upper and lower limit values of the load movement amount from the unbalance rate allowable value and each information output from each database The value calculation unit, and the line voltage change amount upper and lower limit values calculated by the upper and lower limit value calculation unit and the load movement amount upper and lower limit values, the minimization of voltage imbalance is used as an objective function for the multi-time section of the distribution system. There is described a voltage imbalance elimination support apparatus including a load movement amount calculation unit that obtains a load movement amount for eliminating voltage imbalance by optimization calculation.

JP-A-7-99728 JP 2009-124913 A

By the way, when a single-phase connection type generator such as a solar power generator is connected to the three-phase distribution line on the consumer side, the existence of such a generator is considered in order to eliminate the voltage imbalance. Appropriate measures need to be taken.
The present invention has been made in view of such a background, and an object thereof is to provide a method for eliminating voltage imbalance of a three-phase distribution line and an information processing apparatus used in this method.

One of the present invention for solving the above and other problems is a method for eliminating voltage imbalance in a three-phase distribution line,
In the information processing device,
In the new section that is the section of the three-phase distribution line where the transformer is to be newly installed, the generation capacity of the single-phase generator connected to the existing transformer and the generation capacity of the single-phase generator connected to the new transformer A total power generation capacity that is a total is obtained for each phase of the three-phase distribution line, and a first type in which the new transformer is connected to a phase with the minimum total power generation capacity is generated, and the total of each phase in the first type Obtaining a first total generation capacity difference maximum value which is a maximum value of the difference in generation capacity;
In the new section, a second type is generated in which the connection phase is transferred for each of the existing transformer or the new transformer, and the maximum difference in the total generation capacity of each phase is generated for each of the generated second type. Obtaining a value and obtaining a second total generation capacity difference maximum value which is a minimum value of the values;
In the new section, a third type is generated in which the distribution lines are phase-shifted, and the maximum value of the difference in total power generation capacity of each phase is determined for each of the generated third types, and the minimum value is Obtaining a certain third total generation capacity difference maximum value;
Information indicating the specified type by specifying the type that takes the minimum value among the maximum value of the first total power generation capacity difference, the maximum value of the second total power generation capacity difference, and the maximum value of the third total power generation capacity difference And a step of outputting.

  According to the present invention, the type in which the new transformer is connected to the phase with the smallest total power generation capacity (first type), the type in which the connection phase is transferred for each of the existing transformer and the new transformer (second type). Since the type with the maximum total power generation capacity difference is the minimum among the types (third type) in which phase distribution of the distribution lines is performed, the voltage imbalance of the three-phase distribution lines can be reliably eliminated. Moreover, by using the voltage imbalance cancellation support apparatus 10, voltage management work in an electric power company or the like is greatly reduced. Moreover, voltage imbalance of the three-phase distribution line can be surely eliminated without installing an expensive voltage compensation device.

  The information indicating the type output by the type determination processing unit is, for example, information indicating a phase to which each of the existing transformer and the new transformer is connected, information indicating a location where the distribution line is to be phase-transferred, and the like.

Another one of the present invention is the above method for eliminating the voltage imbalance of the three-phase distribution line,
Causing the information processing apparatus to further execute a step of storing a budget available for the transfer of the connection phase and a cost required for the transfer of the connection phase, and a step of generating the type within the range of the budget And

  According to the present invention, since the second type in which the connection phase is transferred within the range of the budget that can be used for the transfer of the connection phase is generated, the voltage imbalance can be reduced within a realistic range in consideration of cost constraints. You can find the best way to solve it.

One of the present invention is the above method for eliminating voltage imbalance in a three-phase distribution line,
Memorize the budget available for phase transfer of the distribution line and the cost required for phase transfer of the distribution line;
The distribution line phase transfer processing unit generates the type within the range of the budget.

  According to the present invention, the third type is generated in which the distribution line phase transfer is performed within the range of the budget that can be used for the distribution line phase transfer. It is possible to find an optimum method for canceling the equilibrium.

  In addition, the subject which this application discloses, and its solution method are clarified by the column of the form for inventing, and drawing.

According to the present invention, voltage imbalance of a three-phase distribution line can be effectively eliminated.

1 is a diagram illustrating a schematic configuration of an information processing system 1. FIG. It is a figure which shows an example of the hardware constitutions of the voltage imbalance cancellation assistance apparatus 10 and / or the distribution system monitoring control apparatus 6. FIG. It is a figure which shows the function implement | achieved by the voltage imbalance cancellation assistance apparatus. It is a figure which shows an example of the system | strain structure of the new section. 10 is a flowchart for explaining processing performed by the voltage imbalance cancellation support device 10 when a new transformer 466 is connected to a new section 40. It is a figure which shows an example of the equipment information table. It is a flowchart explaining the detail of connection phase provisional determination processing S513. It is a figure which shows the result of having calculated | required the total electric power generation capacity of each phase. It is a figure which shows the equipment information table 600 in which the tentatively determined content was reflected. It is a figure which shows the result of having calculated | required the total electric power generation capacity of each phase in the state which added the newly installed transformer. It is a flowchart explaining the detail of connection phase transfer process S514. It is a flowchart explaining the detail of distribution line phase transfer process S515. It is a figure which shows the method of a distribution line phase transfer. It is a figure which shows an example of the work table 1400 produced | generated by the distribution line phase transfer process part 133 in the distribution line phase transfer process S515.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an information processing system 1 described as an embodiment. This information processing system 1 is constructed as an in-house system of an electric power company, for example. As shown in the figure, the information processing system 1 includes a voltage imbalance cancellation support device 10 and a distribution system monitoring and control device 6 that is communicably connected to the voltage imbalance cancellation support device 10 via a communication network 5. It is comprised including.

  The voltage imbalance cancellation support apparatus 10 is an information processing apparatus (computer) provided with a user interface. The voltage imbalance elimination support device 10 eliminates the voltage imbalance, and connects to a single phase transformer (including a case where a common transformer described later is connected to a single phase) to be newly installed in the distribution system (three-phase distribution). Provides information to support the determination of each phase of the wire (whether it is connected to one of the red-white phase, white-blue phase, or blue-red phase).

  The distribution system monitoring control device 6 is provided, for example, at a central command station of an electric power company. The distribution system monitoring and control device 6 is information used for monitoring and controlling information related to a power system and a power generator (hereinafter referred to as a single-phase power generator) that is connected to a three-phase power distribution line and that is linked to the power system. It is a processing device. Here, the single-phase generator refers to a generator that supplies (generates) power to a three-phase distribution line by a single-phase method. The single-phase generator is a distributed power source such as a solar power generator, a wind power generator, a fuel cell, a micro gas turbine, a wave power generator, a biomass power generator, or a diesel generator.

  The distribution system monitoring and control device 6 manages the configuration and state of the distribution system, and information (hereinafter referred to as system information) related to the single-phase generator connected to the three-phase distribution lines constituting the distribution system. The information database 60 is managed. The distribution system monitoring control device 6 searches the system information database 60 in response to the information acquisition request sent from the voltage imbalance cancellation support device 10 and transmits the searched system information to the voltage imbalance cancellation support device 10.

  When the distribution system monitoring and control device 6 receives an information provision request sent from the voltage imbalance cancellation support device 10 through the communication network 5 such as a LAN (Local Area Network), a WAN (Wide Area Network), or the Internet. The corresponding information is searched from the system information database 60, and the searched information is transmitted to the voltage imbalance cancellation support device 10 via the communication network 5.

  FIG. 2 shows an example of the hardware configuration of the voltage imbalance cancellation support device 10 and / or the distribution system monitoring control device 6. As shown in the figure, the information processing apparatus 50 includes a central processing unit 51 such as a CPU (Central Processing Unit) and an MPU (Micro Processor Unit), a memory such as a RAM (random access memory) and a ROM (Read Only Memory). 52, an external storage device 53 such as a hard disk drive or a semiconductor storage device (SSD) (Solid State Drive), an input device 54 such as a keyboard or a mouse for accepting operation input from the user, a liquid crystal monitor or printer for presenting information to the user And a communication interface 56 which is hardware for communicating with other devices via the communication network 5 such as a NIC (Network Interface Card, wireless communication module).

  FIG. 3 shows functions realized in the voltage imbalance cancellation support apparatus 10. As illustrated in FIG. 1, the voltage imbalance cancellation support apparatus 10 includes an input information reception unit 11, a system information acquisition unit 12, and a type determination processing unit 13. These functions are performed by the hardware of the voltage imbalance cancellation support apparatus 10 or the central processing unit 51 of the voltage imbalance cancellation support apparatus 10 reads out the program stored in the memory 52 or the external storage device 53. It is realized by executing.

  The input information receiving unit 11 is information (for example, a section of a section) that designates a predetermined section (hereinafter referred to as a new section) on the distribution system in which a new transformer (hereinafter referred to as a new transformer) is to be provided. Identifiers of switches at both ends), information used in processing performed by the type determination processing unit 13 (hereinafter, these information is referred to as input information), and the like are received from the user, and the received information is stored in the memory 52 or the outside. Store in the storage device 53.

  The system information acquisition unit 12 transmits a system information acquisition request to the distribution system monitoring control device 6 through the communication network 5 and receives the system information transmitted from the distribution system monitoring control device 6 in response to the acquisition request. To do. The system information acquisition unit 12 stores the received system information in the memory 52 or the external storage device 53.

  The type determination processing unit 13 determines the connection phase of the new transformer using the input information received by the input information receiving unit 11 and the system information acquired by the system information acquiring unit 12. As illustrated in FIG. 3, the type determination processing unit 13 includes a connection phase provisional determination processing unit 131, a connection phase transfer processing unit 132, and a distribution line phase transfer processing unit 133.

  Among these, the connection phase temporary determination processing unit 131 obtains the total power generation capacity of each phase in the new section, and generates a type in which the new transformer is connected to the phase having the minimum total power generation capacity (hereinafter referred to as a first type). To do. That is, the connection phase temporary determination processing unit 131 is configured to connect the power generation capacity of the single-phase generator connected to the existing transformer connected to the three-phase distribution line and the new transformer to be connected to the three-phase distribution line in the new section. The total power generation capacity, which is the sum of the power generation capacities of the single-phase generators connected to, is obtained for each phase of the three-phase distribution line, and the first type in which the new transformer is connected to the phase having the minimum total power generation capacity is generated. Then, the connection phase provisional determination processing unit 131 obtains a first total power generation capacity difference maximum value that is a maximum value of a difference in total power generation capacity of each phase in the first type.

  The connection phase transfer processing unit 132 is based on the first type described above, and performs a type of connection phase transfer (hereinafter referred to as connection phase transfer) for each of the existing transformer and the new transformer in the new section (hereinafter referred to as connection phase transfer). , Called the second type), and for each of the generated second type, the maximum value of the difference in the total power generation capacity of each phase is obtained, and the second total power generation capacity difference maximum value, which is the minimum value, is obtained. . Further, the connection phase transfer processing unit 132 stores a budget that can be used for the transfer of the connection phase and a cost required for the transfer of the connection phase, and the connection phase transfer processing unit 132 performs the second type within the range of this budget. Is generated. Note that the input information accepting unit 11 accepts, for example, a budget that can be used for connection phase transfer and a cost required for connection phase transfer from the user.

  The distribution line phase transfer processing unit 133 generates and generates a type (hereinafter referred to as a third type) in which the distribution line is phase-transferred in the new section based on the first type (or the second type). For each of the third type, the maximum value of the difference between the total power generation capacities of the respective phases is obtained, and the third total power generation capacity difference maximum value, which is the minimum value, is obtained. In addition, the distribution line phase transfer is performed by switching the phase in the middle of the distribution line (for example, connecting the red phase and the white phase of the distribution line) in the new section. In addition, the distribution line phase transfer processing unit 133 stores a budget that can be used for phase transfer of the distribution line and a cost required for phase transfer of the distribution line, and the distribution line phase transfer processing unit 133 is within the range of this budget. Generate the above type. In addition, the input information reception part 11 receives the budget which can be utilized for the phase transfer of a distribution line, and the expense required for the phase transfer of a distribution line from a user, for example.

  The type determination processing unit 13 specifies a type that takes the minimum value among the first total power generation capacity difference maximum value, the second total power generation capacity difference maximum value, and the third total power generation capacity difference maximum value, and determines the specified type The indicated information is output to the output device 55. Note that the information indicating the type output by the type determination processing unit 13 includes information indicating the phase to which each of the existing transformer and the new transformer is connected, information indicating the location where the distribution line is to be transferred, and the like. ing.

  Next, processing performed in the information processing system 1 configured as described above will be described together with a specific example.

  FIG. 4 is an example of the system configuration of the new section 40. As shown in the figure, the new section 40 is partitioned by a first switch 41 provided on the upstream side (substation side) and a second switch 42 provided on the downstream side. As shown in the figure, the new section 40 includes a first distribution line 44 including thirteen power poles 43 [10] to [22], and a first distribution line 44 in the power pole 43 [12]. And a second distribution line 45 configured to include six utility poles 43 [1] to [6].

  As shown in the figure, the existing section 40 is connected with an electric transformer and an electric / power common transformer (hereinafter referred to as a common transformer) as existing transformers. A single-phase generator is connected to the existing transformer.

  More specifically, a transformer 461 in which two single-phase generators are arranged on the power pole 43 [10] of the first distribution line 44 (total power generation capacity of the single-phase generator = 3 kW + 3 kW = 6 kW) is provided. The power pole 43 [14] is connected to a transformer 462 (total power generation capacity of the single-phase generator = 3 kW + 4 kW + 4 kW = 11 kW) in which three single-phase generators are arranged, and the power pole 43 [18]. Is connected to a transformer 463 (total power generation capacity of the single-phase generator = 6 kW + 3 kW + 3 kW = 12 kW) provided with three single-phase generators, and two single-phase generators are connected to the utility pole 43 [21]. Transformer 464 (total of power generation capacity of single-phase generator = 3 kW + 3 kW = 6 kW) is connected.

  In addition, the power pole 43 [6] of the second distribution line 45 has a transformer 465 in which three single-phase generators are arranged as existing transformers (total power generation capacity of the single-phase generator = 6 kW + 3 kW + 4 kW = 13 kW). ) Is connected.

  Hereinafter, the common transformer 466 (two single-phase generators of the two single-phase generators) is connected to 43 [3] of the second distribution line 45 of the new section 40 having the system configuration described above. The case of connecting the total power generation capacity = 4 kW + 3 kW = 7 kW) will be described.

  FIG. 5 is a flowchart for explaining processing performed by the voltage imbalance cancellation support device 10 when the new transformer (shared transformer 466) is connected to the new section 40. Hereinafter, the process (configuration determination support process S500) performed by the voltage imbalance cancellation support apparatus 10 will be described with reference to FIG.

  First, the input information receiving unit 11 receives input information from the user and stores it in the memory 52 or the external storage device 53 (S511). In the example shown in FIG. 4, information for identifying the new section 40 (for example, the identifier of the first switch 41 and the identifier of the second switch 42), the budget that can be used for the transfer of the connection phase as described above, The cost required for the transfer of the connection phase, the budget available for the phase transfer of the distribution line, the cost required for the phase transfer of the distribution line, etc. are received as input information.

  Next, the system information acquisition unit 12 transmits a system information acquisition request to the distribution system monitoring control device 6 via the communication network 5, and the system information sent from the distribution system monitoring control device 6 in response to this acquisition request Receive. Then, the system information acquisition unit 12 stores the received system information in the memory 52 or the external storage device 53 (S512).

  In the example illustrated in FIG. 4, the system information acquisition unit 12 transmits information specifying the new section 40 received in S511 to the distribution system monitoring and control device 6 as a search condition, and the system information (hereinafter referred to as “system information”) (hereinafter referred to as “system information”). , Referred to as the facility information table 600) from the distribution system monitoring and control device 6. As shown in the figure, the facility information table 600 includes a utility pole number 611 in which an identifier of the utility pole is set, a switch section 612 in which information specifying the new section 40 is set, and an existing transformer connected to the new section 40 Tr type 613 (Tr is an abbreviation for transformer) in which information indicating the type of transformer (light transformer, common transformer) is set, and the phase of the three-phase distribution line connected to the existing transformer Is composed of a plurality of records including each item of the connection phase 614 in which is set, and the generation capacity 615 of the single-phase generator connected to the existing transformer.

  Next, the connection phase provisional determination processing unit 131 of the type determination processing unit 13 determines the connection phase of the new transformer 466 using the input information received by the input information reception unit 11 and the system information acquired by the system information acquisition unit 12. A provisional determination process (connection phase provisional determination process S513) is performed.

  First, the connection phase temporary determination processing unit 131 generates the total power generation capacity of each phase in the new section (the power generation capacity of the single-phase generator connected to the existing transformer and the power generation of the single-phase generator connected to the new transformer). Total capacity) is generated for each phase of the three-phase distribution line. Then, the connection phase provisional determination processing unit 131 generates a first type in which the new transformer is connected to the phase having the smallest value among the generated total generation capacities, and the difference in the total generation capacities of the respective phases in the first type. The first total power generation capacity difference maximum value S, which is the maximum value of.

  FIG. 7 is a flowchart for explaining the details of the connection phase provisional determination processing S513. The connection phase provisional determination processing unit 131 first obtains the total power generation capacity of each phase (S5131). When the equipment information table 600 has the contents shown in FIG. 6, the total power generation capacity of the “red and white” phase is 17 kW, the total power generation capacity of the “white and blue” phase is 18 kW, and “blue” as shown in FIG. The total power generation capacity of the “red” phase is 4KW. In this case, the connection phase provisional determination processing unit 131 generates a configuration in which the new transformer is connected to the “blue-red” phase so as to minimize the total power generation capacity as the first type (S5132). The first total power generation capacity difference maximum value S (S = 4 + 7 = 11 kW), which is the maximum value of the difference between the total power generation capacities of the respective phases, is obtained (S5133). Moreover, the connection phase provisional determination processing unit 131 reflects the generated content in the equipment information table 600.

  FIG. 9 shows the equipment information table 600 after the reflection. In the figure, the record of the telephone pole number [3] is the record of the new transformer. FIG. 10 shows the total power generation capacity of each phase corresponding to FIG.

  Returning to FIG. 5, the connection phase transfer processing unit 132 of the type determination processing unit 13 performs the connection phase transfer for each of the existing transformer and the new transformer in the new section based on the first type. Two types are generated, the maximum value of the difference between the total power generation capacities of each phase is determined for each of the generated second types, and the second total power generation capacity difference maximum value, which is the minimum value, is determined (connected phase transfer process S514) ). In addition, the connection phase transfer process part 132 produces | generates the said 2nd type within the range of the budget which can be used for transfer of a connection phase.

  FIG. 11 shows details of the connection phase transfer process S514. First, the connected phase transfer processing unit 132 obtains the maximum number of phase transfers a that does not exceed the construction cost available for phase transfer. Further, the connection phase transfer processing unit 132 sets the total number of utility poles connected to the transformer (existing transformer + new transformer) in the new section 40 as a variable m (S5141).

  The connection phase transfer process part 132 performs connection phase transfer (2 patterns) about each transformer (i = 1-m), and calculates | requires each total electric power generation capacity difference maximum value S1pi, S2pi (i = 1-m). Next, the connection phase transfer process part 132 calculates | requires i from which total power generation capacity difference maximum value becomes the minimum to each transformer (i = 1-m). Subsequently, the connected phase transfer processing unit 132 executes the above process for each combination (total number = mCj) in which the transfer number j is changed from 1 to a, and among them, the maximum total generation capacity difference is the minimum. Ask for. Then, the connection phase transfer processing unit 132 sets the maximum total power generation capacity difference in the obtained type as the second total power generation capacity difference maximum value SJ (S5142).

  Returning to FIG. 5, the distribution line phase transfer processing unit 133 of the type determination processing unit 13 is based on the first type (or the second type), and is the third type in which distribution line phase transfer is performed in the new section. For each of the generated third type, the maximum value of the difference between the total power generation capacities of the respective phases is obtained, and the third total power generation capacity difference maximum value, which is the minimum value, is obtained (distribution line phase transfer process S515). ). In addition, the distribution line phase transfer process part 133 produces | generates the said 2nd type within the range of the budget which can be utilized for the phase transfer of a distribution line.

  FIG. 12 shows details of the distribution line phase transfer processing S515. The figure shows the distribution line phase transfer only at one place of the distribution line, and m-1 places when the total number of power poles connected to the transformer (existing transformer and new transformer) in the new section 40 is the variable m. The case where the distribution line phase transfer was performed about (the place between adjacent transformers) is shown. In addition, as shown in FIG. 13, as a distribution line phase transfer method, two methods can be considered for one place of the distribution line.

  First, the distribution line phase transfer processing unit 133 has a maximum total power generation capacity difference for all types (third type) in which the connection phase of each transformer after the transfer location is changed according to the above two transfer methods. Ask for. Next, the distribution line phase transfer processing unit 133 obtains the third total generation capacity difference maximum value SK, which is the minimum value among the obtained total generation capacity difference maximum values (S5151). FIG. 14 shows an example of a work table 1400 generated by the distribution line phase transfer processing unit 133 in the distribution line phase transfer process S515.

  Returning to FIG. 5, the type determination processing unit 13 takes the minimum value among the first total power generation capacity difference maximum value S, the second total power generation capacity difference maximum value SJ, and the third total power generation capacity difference maximum value SK. The type is specified, and information indicating the specified type is output to the output device 55 (type determination processing S516).

  As described above, according to the voltage imbalance elimination support device 10 of the present embodiment, in the new section that is a section of a three-phase distribution line in which a transformer is to be newly installed, the single phase connected to the existing transformer The total power generation capacity, which is the sum of the power generation capacity of the generator and the power generation capacity of the single-phase generator connected to the new transformer, is obtained for each phase of the three-phase distribution line, and the new transformer is set to the phase with the minimum total power generation capacity. Of the type (first type), the type of the existing transformer or the newly installed transformer (second type), and the type of the distribution line (third type) Since the type that minimizes the maximum value of the total power generation capacity difference is specified, the voltage imbalance of the three-phase distribution line can be surely eliminated.

  Moreover, by using the voltage imbalance cancellation support apparatus 10, voltage management work in an electric power company or the like is greatly reduced. Moreover, voltage imbalance of the three-phase distribution line can be surely eliminated without installing an expensive voltage compensation device.

  In addition, loads such as night water heaters are often connected to common transformers, and such loads tend to cause voltage imbalances in the three-phase distribution lines. Since the apparatus 10 determines the optimum type in consideration of the single-phase connection of the common transformer, the voltage imbalance of the three-phase distribution line can be reliably and effectively eliminated.

  Further, the voltage imbalance elimination support device 10 generates the second type in which the connection phase is transferred within the range of the budget that can be used for the transfer of the connection phase. An optimal method for eliminating the voltage imbalance can be obtained.

  Moreover, since the voltage imbalance cancellation support apparatus 10 generates the third type in which the phase change of the distribution line is performed within the range of the budget that can be used for the phase change of the distribution line, it is realistic in consideration of the cost limitation. An optimal method for eliminating voltage imbalance in a range can be obtained.

  Embodiment described above is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Information processing system 5 Communication network 6 Distribution system monitoring control apparatus 60 System information database 10 Voltage imbalance cancellation assistance apparatus 11 Input information reception part 12 System information acquisition part 13 Type determination processing part 131 Connection phase provisional determination processing part 132 Connection phase transfer Processing unit 133 Distribution line phase transfer processing unit 41 First switch 42 Second switch 43 Utility pole 44 First distribution line 45 Second distribution lines 461-465 Transformer (existing)
466 Transformer (new)
S513 Connection phase temporary determination processing S514 Connection phase transfer processing S515 Distribution line phase transfer processing S516 Type determination processing 600 Equipment information table 1400 Work table

Claims (6)

A method for eliminating voltage imbalance in a three-phase distribution line,
In the information processing device,
In the new section, which is the section of the three-phase distribution line where the transformer is to be newly installed, the generation capacity of the single-phase generator connected to the existing transformer and the generation capacity of the single-phase generator connected to the new transformer For each phase of the three-phase distribution line, to generate a first type in which the new transformer is connected to the phase with the minimum total power generation capacity, and for each phase in the first type Obtaining a first total generation capacity difference maximum value which is a maximum value of the difference in total generation capacity;
In the new section, a second type in which the connection phase is transferred for each of the existing transformer or the new transformer is generated, and the maximum difference in total power generation capacity of each phase is generated for each of the generated second type Obtaining a value and obtaining a second total generation capacity difference maximum value which is a minimum value of the values;
In the new section, a third type is generated in which the distribution lines are phase-shifted, and the maximum value of the difference in total power generation capacity of each phase is determined for each of the generated third types, and the minimum value is Obtaining a certain third total generation capacity difference maximum value;
Information indicating the specified type by specifying the type that takes the minimum value among the maximum value of the first total power generation capacity difference, the maximum value of the second total power generation capacity difference, and the maximum value of the third total power generation capacity difference A method for eliminating voltage imbalance in a three-phase distribution line, comprising: A method for eliminating voltage imbalance in a three-phase distribution line according to claim 1,
A common transformer is included in at least one of the existing transformer and the new transformer. A method for eliminating voltage imbalance in a three-phase distribution line. A method for eliminating voltage imbalance in a three-phase distribution line according to claim 1,
The information processing apparatus further stores a budget that can be used to transfer the connection phase and a cost required to transfer the connection phase;
And generating the type within the range of the budget. A method for eliminating voltage imbalance in a three-phase distribution line. A method for eliminating voltage imbalance in a three-phase distribution line according to claim 1,
The information processing apparatus further stores a budget available for phase transfer of the distribution line and a cost required for phase transfer of the distribution line;
And generating the type within the range of the budget. A method for eliminating voltage imbalance in a three-phase distribution line. The information processing apparatus according to claim 1,
The information indicating the type output by the type determination processing unit includes:
The information processing apparatus includes at least one of information indicating a phase to which each of the existing transformer and the new transformer is connected and information indicating a location where the phase transfer of the distribution line is performed. . An information processing apparatus used in a method for eliminating voltage imbalance in a three-phase distribution line,
In the new section, which is the section of the three-phase distribution line where the transformer is to be newly installed, the generation capacity of the single-phase generator connected to the existing transformer and the generation capacity of the single-phase generator connected to the new transformer For each phase of the three-phase distribution line, to generate a first type in which the new transformer is connected to the phase with the minimum total power generation capacity, and for each phase in the first type A connection phase provisional determination processing unit for obtaining a first total power generation capacity difference maximum value which is a maximum value of a difference in total power generation capacity;
In the new section, a second type in which the connection phase is transferred for each of the existing transformer or the new transformer is generated, and the maximum difference in total power generation capacity of each phase is generated for each of the generated second type A connection phase transfer processing unit for obtaining a value and obtaining a second total generation capacity difference maximum value which is a minimum value thereof,
In the new section, a third type is generated in which the distribution lines are phase-shifted, and the maximum value of the difference in total power generation capacity of each phase is determined for each of the generated third types, and the minimum value is A distribution line phase transfer processing unit for obtaining a maximum value of a third total power generation capacity difference;
Information indicating the specified type by specifying the type that takes the minimum value among the maximum value of the first total power generation capacity difference, the maximum value of the second total power generation capacity difference, and the maximum value of the third total power generation capacity difference An information processing apparatus comprising: a type determination processing unit that outputs