JP2016127691A - Transformer number determination device, transformer number determination method and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer number determination device, a transformer number determination method and a computer program capable of reducing the loss on transformers by acquiring the number of operation transformers.SOLUTION: The transformer number determination device includes an acquisition section, a judgement section and a determination section. The acquisition section acquires the load of electric power on plural transformers which are connected in parallel to each other. The judgement section determines the number of the transformers which satisfy a predetermined condition of the loss on the transformers due to the load electric power. The determination section determines the transformers to be connected/disconnected based on the number of the transformers judged by the judgement section.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a transformer number determining device, a transformer number determining method, and a computer program.

  Generally, a power receiving / transforming facility has a plurality of transformers, and supplies power (hereinafter referred to as “load power”) to a load facility connected to the power receiving / transforming facility by operating the transformers in parallel. However, when supplying load power to the load facility, losses (load loss and no-load loss) corresponding to the load power occur in the transformer. Therefore, the power receiving / transforming equipment calculates the loss of the transformer based on the load power, and drives the number of transformers in operation so that the loss of the transformer is reduced.

  However, during the parallel operation of transformers, the number of transformers operated according to the load power is obtained by manual calculation by an operator. When the capacity of the transformer is not the same or when the load fluctuation of the power receiving / transforming equipment is large, the calculation of the number of operating transformers becomes complicated or complicated. Therefore, such manual calculation increases the workload and is inefficient.

Japanese Patent Laid-Open No. 9-322395

  The problem to be solved by the present invention is to provide a transformer number determining device, a transformer number determining method, and a computer program that reduce the loss of each transformer by acquiring the number of operating transformers.

  The number-of-transformers determination device of an embodiment has an acquisition part, a judgment part, and a determination part. The acquisition unit acquires load power of a plurality of transformers connected in parallel. The determination unit determines the number of the transformers in which a loss of the transformer due to the load power satisfies a predetermined condition. The determining unit determines the transformer to be disconnected or connected based on the number of the transformers determined by the determining unit.

The schematic block diagram which shows an example of the receiving power supply installation using the transformer number determination apparatus 100 of 1st Embodiment. The schematic block diagram which shows an example of the transformer number determination apparatus 100-1 of 1st Embodiment. And plots the total loss W _1Li transformer when the transformer total loss W _2Li a transformer was operated one upon two parallel operation transformer of the first embodiment. The figure which plotted the load loss and no-load loss of the transformer at the time of operating one transformer of 1st Embodiment. The flowchart figure of the process of the transformer number determination apparatus 100-1 in 1st Embodiment. The schematic block diagram which shows an example of the receiving power supply installation using 100A of transformer number determination apparatuses of 2nd Embodiment. The schematic block diagram which shows an example of the control part 300 of the transformer number determination apparatus of 2nd Embodiment. The flowchart figure of the process of the transformer number determination apparatus 100-1 in 2nd Embodiment.

  Hereinafter, an apparatus for determining the number of transformers according to an embodiment will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic block diagram illustrating an example of a power receiving power supply facility using the transformer number determining device according to the first embodiment.
The power receiving power supply facility 1 of this embodiment has a plurality of transformers connected in parallel.
The power receiving power facility 1 includes a plurality of load measuring units 10 (a load measuring unit 10-1 and a load measuring unit 10-2), a plurality of transformer primary side switches 20 (a transformer primary side switch 20-1 and a transformer). Primary side switch 20-2), a plurality of transformers 30 (transformer 30-1 and transformer 30-2), a plurality of transformer secondary side switches 40 (transformer secondary side switch 40-1 and A transformer secondary side switch 40-2), a load facility 50, and a plurality of transformer number determining devices 100 (a transformer number determining device 100-1 and a transformer number determining device 100-2). In addition, in this embodiment, although the transformer 30 demonstrates the case where the two transformers 30-1 and the transformer 30-2 are provided, it is not limited to this number.

The transformer 30 transforms a received voltage of high voltage or extra high voltage (hereinafter simply referred to as “high voltage”) supplied from the power system into a predetermined voltage for the load facility 50. The primary winding of the transformer 30-1 is connected to the power system via the transformer primary side switch 20-1. The transformer 30-1 is supplied with a high received voltage from the power system.
The secondary winding of the transformer 30-1 is connected to the load facility 50 via the transformer secondary side switch 40-1. The transformer 30-1 supplies the transformed voltage to the transformer secondary side switch 40-1.

The primary winding of the transformer 30-2 is connected to the power system via the transformer primary side switch 20-2. The transformer 30-2 is supplied with a high received voltage from the power system.
The secondary winding of the transformer 30-2 is connected to the load facility 50 via the transformer secondary side switch 40-2. The transformer 30-2 supplies the transformed voltage to the transformer secondary side switch 40-2.

  The primary side of the transformer primary side switch 20-1 is connected to the power system. The secondary side of the transformer primary side switch 20-1 is connected to the primary winding of the transformer 30-1. Moreover, the transformer primary side switch 20-1 is connected to the transformer number determination apparatus 100-1. When the control signal is supplied from the transformer number determining device 100-1, the transformer primary side switch 20-1 connects or opens the primary winding of the transformer 30-1 and the power system. In the present embodiment, the transformer primary side switch 20-1 connects the primary winding of the transformer 30-1 and the power system when a control signal is supplied from the transformer number determining device 100-1.

  The primary side of the transformer primary side switch 20-2 is connected to the power system. The secondary side of the transformer primary side switch 20-2 is connected to the primary winding of the transformer 30-2. Moreover, the transformer primary side switch 20-2 is connected to the transformer number determination apparatus 100-2. When the control signal is supplied from the transformer number determining device 100-2, the transformer primary side switch 20-2 connects or opens the primary winding of the transformer 30-2 and the power system. In the present embodiment, the transformer primary side switch 20-2 connects the primary winding of the transformer 30-2 and the power system when a control signal is supplied from the transformer number determining device 100-1.

  The transformer secondary side switch 40-1 has an input connected to the secondary winding of the transformer 30-1. The secondary side of the transformer secondary side switch 40-1 is connected to the load facility 50. Moreover, the transformer secondary side switch 40-1 is connected to the transformer number determination apparatus 100-1. The transformer secondary side switch 40-1 connects or opens the secondary winding of the transformer 30-1 and the load facility 50 when a control signal is supplied from the transformer number determining device 100-1. In the present embodiment, when the control signal is supplied from the transformer number determining device 100-1, the transformer secondary side switch 40-1 connects the secondary winding of the transformer 30-1 and the load facility 50. Connecting.

The primary side of the transformer secondary side switch 40-2 is connected to the secondary winding of the transformer 30-2. The secondary side of the transformer secondary side switch 40-2 is connected to the load facility 50. Moreover, the transformer secondary side switch 40-2 is connected to the transformer number determination apparatus 100-2. The transformer secondary side switch 40-2 connects or opens the secondary winding of the transformer 30-2 and the load facility 50 when a control signal is supplied from the transformer number determining device 100-2. In this embodiment, when the control signal is supplied from the transformer number determining device 100-1, the transformer secondary side switch 40-2 connects the secondary winding of the transformer 30-2 and the load facility 50. Connecting.
Note that connecting the primary winding of the transformer 30 and the power system and connecting the secondary winding of the transformer 30 and the load facility 50 is referred to as connection of the transformer. On the other hand, opening the primary winding and the power system of the transformer 30 and opening the secondary winding of the transformer 30 and the load facility 50 is referred to as disconnecting the transformer.

Load measuring unit 10-1 measures the load _{F 1} of the transformer 30-1. Load F ₁ may be the load power of the transformer 30-1, may be the load current. Load measuring unit 10-1, and outputs the load _{F 1} measured in the transformers number determination unit 100-1.
Load measuring unit 10-2 measures the load _{F 2} of the transformer 30-2. Load F ₂ may be the load power of the transformer 30-2, may be the load current. Load measuring unit 10-2, and outputs the measured load _{F 2} to the transformer number determination unit 100-2.
The load facility 50 is a power supply facility such as a large-scale factory, plant, high-rise building, common facility, or commercial facility.

  The number-of-transformers determining device 100 determines the number of operating transformers 30 from the loss of the transformer 30, and controls the opening and closing of the transformer primary side switch 20 and the transformer secondary side switch 40 based on the determination. To do. The number-of-transformers determining device 100-1 is connected to the number-of-transformers determining device 100-2 and can communicate with each other.

  FIG. 2 is a schematic block diagram illustrating an example of the transformer number determining device 100-1 according to the first embodiment. The transformer number determining device 100-2 has the same configuration as the transformer number determining device 100-1 shown in FIG.

The number-of-transformers determination device 100-1 includes a measurement value acquisition unit 110, a communication unit 120, a determination unit 130, a storage unit 140, a determination unit 150, and an output unit 160.
Measurement value acquisition unit 110 acquires the load _{F 1} supplied from the load measuring unit 10-1. The measurement value acquisition unit 110 outputs the acquired load F ₁ to the communication unit 120 and the determination unit 130. Further, the measurement value acquisition unit 110 acquires the load F ₂ via the communication unit 120. Measurement value acquisition unit 110 outputs the load _{F 2} obtained in the determination unit 130.

The communication unit 120 outputs the supplied from the measurement value acquisition unit 110 loads _{F 1} to the communication unit 120 of the transformer number determination unit 100-2. The communication unit 120 acquires the load _{F 2} from the communication unit 120 of the transformer number determination unit 100-2, and outputs the measurement value acquisition unit 110.
The communication unit 120 outputs the determination result determined by the determination unit 130 (hereinafter, referred to as “first determination result”) to the communication unit 120 of the transformer number determining device 100-2 and also the transformer number determining device 100. -2 of the determination unit 130 (hereinafter, referred to as “second determination result”) is acquired from the transformer number determining device 100-2. The communication unit 120 outputs the acquired second determination result to the determination unit 130.

The determination unit 130 determines the number of operating transformers 30 in which the loss of the transformer 30 satisfies a predetermined condition. For example, the predetermined condition is that the loss of the transformer 30 is minimized. Hereinafter, a method for determining the number of operating transformers 30 will be described.
The determination unit 130 adds the load F ₁ and the load F ₂ and sets the added value as the total load F ₃ . Total load F ₃ is, for example, a total load power or the total load current.
The determination unit 130 acquires the load threshold F _th from the storage unit 140 and determines whether the total load F ₃ exceeds the load threshold F _th , thereby determining the number of operating transformers 30. The load threshold F _th is a threshold for determining the number of operating transformers 30 and is stored in the storage unit 140 in advance. The determination unit 130 outputs a first determination result regarding the number of operating transformers 30 to the communication unit 120. On the other hand, the determination unit 130 acquires a second determination result regarding the number of operating transformers 30 from the communication unit 120. The determination unit 130 compares the first determination result and the second determination result, and if the result is the same, determines the result. For example, when both the first determination result and the second determination result are “the number of operating transformers 30 is two”, the determination unit 130 determines to connect the two transformers 30. . Hereinafter, the load threshold F _th will be described.

The number of operating transformers 30 is determined based on the loss of the transformer 30. First, the loss of the transformer 30 is calculated. For example, if the transformer rated capacity Pi is N inverter parallel operation, when the total load power and the total load power W _i, load loss W _LLi per one transformer is represented by the formula (1) .

The load loss W _LMi indicates the load loss when the transformer is 100% loaded. Further, the total load power _Wi is obtained from the total load current and the voltage applied to the load. The voltage applied to the load is set in advance. Therefore, the total load power W _i may be measured directly by the power sensor and the like, may be indirectly determined from the measured total load current.
Loss _{W Li} of the transformer per one is obtained by adding the no-load loss _{W NLi} in load loss _{W LLi,} it is expressed by equation (2).

Therefore, when a plurality of transformers, that is, N units are operated in parallel, the total loss W _TLi of the transformer is a value obtained by multiplying the loss W _Li per transformer by the number of transformers, It is represented by

As an example here, when the transformer rated capacity P _i in power receiving and transforming equipment is installed two, electric power consumption when the two parallel operating a transformer, i.e. the total load power and the total load power W ₂ Then, the total loss _W2Li of a transformer is represented by (4) Formula from (1) Formula to (3) Formula.

Also, in the equipment, when one driving transformer rated capacity _{P i,} that loss _{W 1Li} than (3) from equation (1) is expressed by equation (5).

Thereby, the loss of the transformer 30 based on the number of transformers can be calculated from the formulas (1) to (3).
Next, a method for obtaining the number of operating transformers 30 from the loss of the transformer 30 will be described. As an example, the case where the transformer rated capacity P _i is placed two in power receiving and transforming equipment.
Figure 3 is a plot of the total loss W _1Li transformer when the transformer total loss W _2Li a transformer was operated one upon parallel operation two transformers. As shown in FIG. 3, the vertical axis (y-axis) indicates the loss, and the horizontal axis (x-axis) indicates the load factor. Load factor, the total load power W ₂ is divided by the rated capacity P _i. In order to plot the total loss _W2Li of the transformer when two transformers are operated in parallel in FIG. 3, the equation (4) is transformed into the equation (6). Moreover, in order to plot the total loss _W1Li of the transformer at the time of operating one transformer in FIG. 3, Formula (5) was changed into Formula (7).

Here, the value of x satisfying y ₂ ≧ y ₁ is represented by equation (8) from equations (6) and (7).

Therefore, as shown in FIG. 3, the load factor x _th shown in the equation (8) is the value of the x coordinate of the point A that is the intersection of y _{1 and} y ₂ . Incidentally, _{y 1} or _{y 2} shown in FIG. 3 is the loss of the transformer. Accordingly, as shown in FIG. 4, y ₁ is the sum of the load loss and no-load loss. For example, the load loss is a resistance loss due to the resistance of the winding of the transformer 30 due to the load current. For example, the no-load loss is an iron loss that occurs in an iron core that is a magnetic flux path of the transformer 30. FIG. 4 is a graph plotting the load loss and no-load loss of a transformer when one transformer is operated. The vertical axis is the loss, and the horizontal axis is the load factor. Accordingly, y ₁ shown in FIG. 3 is a graph plotting each load factor the total value of the load loss and no-load loss shown in FIG. Also, y ₂ shown in FIG. 3 is a graph plotting each load factor and a load loss and no-load loss of the two transformers at the time of the transformer 2 is operated.

As shown in FIG. 3 and (8), if the actually measured load factor is equal to or less than the load factor x _th, the loss when one operation of the transformer (connection) of the transformer during the two parallel operation loss It turns out that it becomes the following. Therefore, if the actually measured load factor is equal to or less than the load factor x _th, the one operation of the transformer, it can be seen that the efficiency is better than two parallel operation of transformers. On the other hand, if the actually measured load factor is greater than the load factor x _th, the transformer during one operation loss is found to exceed the transformer loss during two parallel operation. Therefore, if the actually measured load factor is greater than the load factor x _th, the two parallel operation of transformers, it is understood that more efficient than one operation of the transformer.

Here, the no-load loss W _NLi and the load loss W _LMi are constants and are set in advance. Therefore, the load factor x _th shown in the equation (8) is a value determined by the number N of transformers 30 installed in the power receiving / transforming facility 1 or the like. That is, if the number N of transformers 30 is determined, the load factor x _{th serving as} a threshold can be set in advance. Note that the load factor x _th is stored in the storage unit 140 as a load threshold. The load factor has a one-to-one correspondence with the total load power and the total load current. Therefore, the total load power corresponding to the load factor x _th or the total load current may be stored in the storage unit 140 as a load threshold.

  When the determination result in the determination unit 130 is confirmed, the determination unit 150 sets the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 to an open state or a closed state based on the determination result. To decide. That is, the determination unit 150 determines whether to connect or disconnect the transformer 30-1. For example, when the determination result is “connection of two transformers 30”, the determination unit 150 instructs the transformer primary switch 20-1 and the transformer secondary switch 40-1 to be closed. The signal is output to the output unit 160. However, when the determination result is “connection of one transformer 30”, the transformer primary side switch 20-1 and the transformer secondary side switch 40-1, or the transformer primary side switch 20-1. And it is necessary to make either the closed state of the transformer secondary side switch 40-1 into a closed state. Therefore, when a determination result “connection of one transformer 30” is obtained, a transformer that is closed (or opened) may be set in advance. However, the lifetime of the transformer also depends on the number of times the transformer is connected and disconnected. Therefore, the determination unit 150 controls the transformer 30 so as to equalize the number of times each transformer (transformer 30-1 and transformer 30-2) is connected and disconnected. That is, the determination unit 150 stores a past history of information on disconnection or connection of the transformer 30 in the storage unit 140, and alternately operates the transformers 30 based on the disconnection or connection history of the transformer 30. . For example, the determination unit 150 stores the history of the switching states of the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 in the storage unit 140, and also stores the history of the number of transformers in the transformer number determination device 100-2. Output. The determining unit 150 of the transformer number determining devices 100-1 and 100-2 includes the switching states of the transformer primary side switch 20-1 and the transformer secondary side switch 40-1, and the transformer primary side switch 20-1. -2 and an open / close command to the output unit 160 based on the history of the open / close state of the transformer secondary side switch 40-2. For example, in the previous step, the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 are closed, and the transformer primary side switch 20-2 and the transformer secondary side switch 40-1 are closed. -2 is open, the determining unit 150 of the transformer number determining device 100-1 opens the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 to the output unit 160. Outputs the command to set the status. On the other hand, the determination unit 150 of the transformer number determination device 100-2 outputs a command to the output unit 160 to close the transformer primary side switch 20-2 and the transformer secondary side switch 40-2.

  In the previous step, when the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 are in the open state, the determining unit 150 of the transformer number determining device 100-1 outputs the output A command to close the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 is output to the unit 160. On the other hand, the determining unit 150 of the transformer number determining device 100-2 outputs a command for opening the transformer primary side switch 20-2 and the transformer secondary side switch 40-2 to the output unit 160.

  The output unit 160 outputs a control signal to the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 based on the command supplied from the determination unit 150. For example, when the output unit 160 obtains a command to open the transformer primary side switch 20-1 and the transformer secondary side switch 40-1 from the determination unit 150, the transformer primary side switch 20- 1 and a control signal are output to the transformer secondary side switch 40-1.

  In addition, the number-of-transformers determining device 100 has a timing of outputting a control signal to the transformer primary side switch 20 and the transformer secondary side switch 40 so that the transformers 30 are not simultaneously connected or disconnected. It is arbitrarily set for each transformer number determining device 100. In addition, the transformer number determination device 100 is configured to open / close the primary side of the transformer within a predetermined time after the connection or disconnection of the transformer 30 so that the connection or disconnection of the transformer 30 is not repeated in a short time. The control signal is not output to the transformer 20 and the transformer secondary side switch 40.

FIG. 5 is a flowchart of the process of the transformer number determining device 100-1 in the first embodiment.
In step S101, the measurement value acquisition unit 110 acquires the load _{F 1} supplied from the load measuring unit 10-1. The measurement value acquisition unit 110 outputs the acquired F ₁ to the communication unit 120 and the determination unit 130. Further, the measurement value acquisition unit 110 acquires the load F ₂ via the communication unit 120. Measurement value acquisition unit 110 outputs the load _{F 2} obtained in the determination unit 130. The communication unit 120 outputs the supplied from the measurement value acquisition unit 110 loads _{F 1} to the communication unit 120 of the transformer number determination unit 100-2. The communication unit 120 acquires the load _{F 2} from the communication unit 120 of the transformer number determination unit 100-2, and outputs the measurement value acquisition unit 110.

In step S102, the determination unit 130 adds the load _{F 1} and the load _{F 2,} the added value and the total load _{F 3.}

In step S103, the determination unit 130 acquires the load threshold F _th from the storage unit 140, and determines whether or not the total load F ₃ exceeds the load threshold F _th . Determination unit 130, when the total load _{F 3} exceeds the load threshold _{F th} (step S103: YES), the number of operating units which loss becomes minimum transformer is determined to be two. On the other hand, the determination unit 130, when the total load _{F 3} is less than the load threshold _{F th} (step S103: NO), the number of operating units which loss becomes minimum transformer is determined to be one.
In step S <b> 104, the determination unit 130 gives a determination result indicating that the number of operating units with the smallest transformer loss is two via the communication unit 120 to another transformer number determination device (transformer number determination device 100. -2).
In step S <b> 105, the determination unit 130 determines the determination result that the number of operating units with the smallest transformer loss is one other communication unit 120 through the communication unit 120 (transformer number determination device 100-2). Output to.

  In step S <b> 106, the determination unit 130 acquires a determination result indicating the number of operating units that minimizes the transformer loss from another transformer number determining device (transformer number determining device 100-2). Then, the determination unit 130 determines its own determination result when its own determination result and the determination result of the other transformer number determining device are the same result.

  In step S <b> 107, the determination unit 150 determines whether to disconnect or connect the transformer 30-1 connected to itself based on the determination result determined by the determination unit 130. When the output unit 160 determines to disconnect the transformer 30-1, the output unit 160 does not output a control signal to the transformer primary side switch 20-1 and the transformer secondary side switch 40-1. When it is determined that the transformer 30-1 is connected, the output unit 160 outputs a control signal to the transformer primary side switch 20-1 and the transformer secondary side switch 40-1.

According to at least one embodiment described above, the number-of-transformers determining apparatus 100 according to the embodiment loads the number of transformers 30 that minimize the loss of the transformer 30 due to the total load, for example, satisfies a predetermined condition. Determine based on the threshold. Thereby, the transformer number determination apparatus 100 can calculate the number of operating transformers that minimizes the transformer loss more efficiently than manual calculation.
Moreover, the transformer number determination apparatus 100 can level the connection or disconnection frequency of the transformer 30 by alternately operating the transformer 30 based on the connection or disconnection history of the transformer 30. Accordingly, it is possible to prevent the product life of some of the transformers 30 from being shortened.

(Second Embodiment)
Next, the transformer number determining apparatus 100A of the second embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
FIG. 6 is a schematic block diagram illustrating an example of a power receiving power supply facility using the transformer number determining device 100A of the second embodiment.

The power receiving power supply facility 1A of the present embodiment has a plurality of transformers connected in parallel.
The power receiving power facility 1A includes a plurality of load measuring units 10 (load measuring unit 10-1 and load measuring unit 10-2), a plurality of transformer primary side switches 20 (transformer primary side switch 20-1 and transformer). Primary side switch 20-2), a plurality of transformers 30 (transformer 30-1 and transformer 30-2), a plurality of transformer secondary side switches 40 (transformer secondary side switch 40-1 and A transformer secondary side switch 40-2), a load facility 50, and a transformer number determining device 100A are provided.

The transformer number determination device 100A includes an input unit 200 and a control unit 300.
The input unit 200 stores in advance transformer information such as load loss at 100% load, no load loss, and rated capacity for each transformer 30 installed in the power receiving / transforming facility 1A. And the input part 200 outputs the information of the transformer 30 to the control part 300 for every transformer 30 installed in 1A of receiving / transforming equipment. Therefore, for example, when three or more transformers are operated in parallel, when transformers 30 having different capacities are operated in parallel, or when the number of transformers is changed, such as adding or deleting transformers, the input unit 200 Outputs information on the transformer 30 to the controller 300.

FIG. 7 is a schematic block diagram illustrating an example of the control unit 300 of the transformer number determining device according to the second embodiment.
As illustrated in FIG. 7, the control unit 300 includes a measurement value acquisition unit 310, a calculation unit 320, a determination unit 130, a storage unit 140, a determination unit 150, and an output unit 160.

Measurement value acquisition unit 310 acquires the load _{F 1} supplied from the load measuring unit 10-1. Measurement value acquisition unit 110 acquires the load _{F 2} is supplied from the load measuring unit 10-2. The measurement value acquisition unit 310 outputs the load F ₁ and the load F ₂ to the determination unit 130.

The calculation unit 320 acquires values of load loss, no-load loss, and rated capacity for each transformer 30 from the input unit 200. The calculation unit 320 calculates the load factor x _th by substituting the values of the load loss, no-load loss, and rated capacity acquired from the input unit 200 into the equation (8). The calculation unit 320 outputs the calculated load factor x _th to the determination unit 130.

FIG. 8 is a flowchart of processing of the transformer number determining device 100A in the second embodiment.
In step S <b> 201, the calculation unit 320 acquires transformer information from the input unit 200.
In step S202, the calculator 320 calculates (8) the load loss obtained from the input unit 200 substitutes the value of no-load loss and the rated capacity that the type, load factor x _th. The calculation unit 320 outputs the calculated load factor x _th to the determination unit 130.

In step S203, the measurement value acquisition unit 110 acquires the load _{F 1} supplied from the load measuring unit 10-1. Measurement value acquisition unit 110 obtains an _{F 2} supplied from the load measuring unit 10-2. The measurement value acquisition unit 110 outputs the acquired load F ₁ and load F ₂ to the determination unit 130.

In step S204, the determination unit 130 adds the load _{F 1} and the load _{F 2,} the added value and the total load _{F 3.}

In step S <b> 205, the determination unit 130 determines whether or not the total load F ₃ exceeds the load threshold F _t acquired from the calculation unit 320. Determination unit 130, when the total load _{F 3} exceeds the load threshold _{F th} (step S205: YES), the number of operating units which loss becomes minimum transformer is determined to be two. On the other hand, the determination unit 130, when the total load _{F 3} is less than the load threshold _{F th} (step S205: NO), the number of operating units which loss becomes minimum transformer is determined to be one.
In step S <b> 206, the determination unit 130 gives a determination result indicating that the number of operating units with the smallest transformer loss is two via the communication unit 120 to another transformer number determination device (transformer number determination device 100. -2).
In step S207, the determination unit 130 determines the determination result that the number of operating units with the smallest transformer loss is one other transformer number determination device (transformer number determination device 100-2) via the communication unit 120. Output to.

  In step S208, the determination unit 130 acquires a determination result indicating the number of operating units that minimizes the loss of the transformer from another transformer number determining device (transformer number determining device 100-2). Then, the determination unit 130 determines its own determination result when its own determination result and the determination result of the other transformer number determining device are the same result.

  In step S209, the determination unit 150 determines whether to disconnect or connect the transformer 30-1 connected to itself based on the determination result determined by the determination unit 130. When the output unit 160 determines to disconnect the transformer 30-1, the output unit 160 does not output a control signal to the transformer primary side switch 20-1 and the transformer secondary side switch 40-1. When it is determined that the transformer 30-1 is connected, the output unit 160 outputs a control signal to the transformer primary side switch 20-1 and the transformer secondary side switch 40-1.

According to at least one embodiment described above, the transformer number determining device 100A according to the embodiment sets the number of transformers 30 that minimize the loss of the transformer 30 due to the total load to a predetermined condition, for example, the load threshold. Determine based on. Thereby, the transformer number determining device 100A can calculate the number of operating transformers that minimizes the loss of the transformer more efficiently than the manual calculation.
The transformer number determination device 100A of the embodiment further includes an input unit 200 having information on the transformer 30, and the calculation unit 320 acquires information on the transformer 30 from the input unit 200, and A load threshold is calculated based on the information. As a result, when three or more transformers are operated in parallel, when transformers 30 of different capacities are operated in parallel, or when the number of transformers is changed, such as adding or deleting transformers, the number of transformers The determination apparatus 100A can efficiently calculate the number of operating transformers that minimizes the transformer loss by simply changing the information of the transformer 30 from the input unit 200 without requiring significant modification. Can do.

  Further, the transformer number determination device 100A can level the number of connection or disconnection of the transformer 30 by alternately operating the transformer 30 based on the connection or disconnection history of the transformer 30. Accordingly, it is possible to prevent the product life of some of the transformers 30 from being shortened.

In the above-described embodiment, due to the influence of noise or the like, the transformer primary side switch 20 and the transformer secondary side switch 40 generated when the total load F ₃ exceeds or falls below the load threshold F _{th a} plurality of times in a short time. In order to prevent chattering, the load threshold _Fth may be provided with hysteresis.

  In the above-described embodiment, the transformer number determining device 100 or 100A further includes a display device, and the display device displays the loss of the transformer 30 reduced by itself and the power rate corresponding to the loss. You may do it.

In the above-described embodiment, one load threshold value _Fth is used. However, the present invention is not limited to this. For example, a plurality of load thresholds having different values depending on the number of transformers that are operated in parallel may be used, and the number of transformers that operate with the minimum transformer loss may be obtained based on the plurality of load thresholds.

  You may implement | achieve the function of the transformer number determination apparatus 100 in the embodiment mentioned above or the transformer number determination apparatus 100A with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Receiving power supply equipment, 10 ... Load measurement part, 20 ... Transformer primary side switch, 30 ... Transformer, 40 ... Transformer secondary side switch, 50 ... Load equipment, 100, 100A ... Transformer number determination apparatus , 110 ... measurement value acquisition unit, 120 ... communication unit, 130 ... determination unit, 140 ... storage unit, 150 ... determination unit, 160 ... output unit, 200 ... input unit, 300 ... control unit

Claims (7)

An acquisition unit for acquiring load power of a plurality of transformers connected in parallel;
A determination unit that determines the number of the transformers that satisfy a predetermined condition in which the loss of the transformer due to the load power is satisfied,
Based on the number of the transformers determined by the determination unit, a determination unit that determines the transformer to be disconnected or connected;
An apparatus for determining the number of transformers. The determination unit determines the number of the transformers based on whether or not the load power exceeds a predetermined threshold,
2. The number-of-transformers determining device according to claim 1, wherein the predetermined threshold is a value determined based on information on the transformer having values of no-load loss of the transformer and load loss at 100% load. .   The transformer number determination apparatus according to claim 2, further comprising a calculation unit that calculates the predetermined threshold based on information on the transformer.   The said determination part controls the switching state of the said transformer based on the past log | history of the information which disconnected or connected the said transformer, The number of transformers as described in any one of Claims 1-3 Decision device.   The number of transformers according to any one of claims 1 to 4, wherein a difference value between a maximum value and a minimum value of loss of the transformer due to the load power, or an electricity rate corresponding to the difference value is displayed. Decision device. An acquisition process for acquiring load power of a plurality of transformers connected in parallel;
A determination process for determining the number of the transformers that satisfies a predetermined condition in which the loss of the transformer due to the load power,
Based on the number of transformers determined by the determination unit, a determination process for determining the transformer to be disconnected or connected;
A method for determining the number of transformers. On the computer,
An acquisition step of acquiring load power of a plurality of transformers connected in parallel;
A determination step of determining the number of the transformers that satisfies a predetermined condition in which the loss of the transformer due to the load power satisfies a predetermined condition;
A determination step of determining the transformer to be disconnected or connected based on the number of the transformers determined by the determination unit;
A computer program for running.

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