JP5868935B2 - Reactive power adjustment device installation position and adjustment amount determination method, program, reactive power adjustment device installation position and adjustment amount determination device - Google Patents

Description

  The present invention relates to a reactive power adjustment device installation position and adjustment amount determination method, a program, and a reactive power adjustment device installation position and adjustment amount determination device.

  For example, a three-phase distribution line in which voltage imbalance occurs is known (for example, Patent Document 1).

JP 2012-228045 A

  In general, in the three-phase distribution line including the three-phase distribution line of Patent Document 1, for example, in order to reduce the voltage unbalance rate indicating the degree of voltage unbalance generated based on the power consumption of the connected power load, A reactive power adjustment device is installed. However, since the three-phase distribution line is over a relatively long distance and there are a plurality of candidates for the installation position of the reactive power adjustment device, for example, the installation of the reactive power adjustment device for reducing the voltage imbalance rate of the three-phase distribution line It may be complicated to determine the position and the amount of reactive power adjustment by the reactive power adjustment apparatus.

The main present invention that solves the above-described problem is an invalidity that defines an installation position of a reactive power adjustment device that adjusts a reactive power of a three-phase distribution line, and an adjustment amount of the reactive power to be adjusted by the reactive power adjustment device. A method for determining an installation position and an adjustment amount of a power adjustment device , wherein the first arithmetic unit is configured to cause the first position of the three-phase distribution line to be equal to or less than a first value. A first step of calculating the first reactive power adjustment amount, and a second arithmetic device downstream from the upstream side of the three-phase distribution line when the reactive power is adjusted based on the first reactive power adjustment amount A second step of calculating a first voltage unbalance rate across the side, and a third calculation device, wherein the value of the voltage unbalance rate at the second position of the three-phase distribution line is equal to or less than a second value. A third step of calculating a second reactive power adjustment amount at two positions , 4th fourth arithmetic unit, which calculates the second when the reactive power on the basis of reactive power adjustment amount is adjusted, the second voltage unbalance factor over the downstream side from the upstream side of the three-phase distribution line A fifth step in which the first determination device determines the installation position based on the calculation results of the second and fourth steps; and a second determination device determines the calculation results of the first and third steps; And a sixth step of determining the adjustment amount based on the determination result of the fifth step.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, the installation position and the adjustment amount of the reactive power adjustment device can be determined.

It is a figure which shows the power distribution system in 1st Embodiment of this invention. It is a block diagram which shows the hardware of the unbalance suppression apparatus in 1st Embodiment of this invention. It is a block diagram which shows the unbalance suppression apparatus in the 1st thru | or 4th embodiment of this invention. It is a figure which shows the power distribution system and object position in 1st Embodiment of this invention. It is a figure which shows the voltage imbalance rate in each position of the distribution line in 1st Embodiment of this invention. It is a figure which shows the maximum value of the voltage imbalance rate in each time in 1st Embodiment of this invention. It is a figure which shows the relationship between the reactive power adjustment amount of the object position in 1st Embodiment of this invention, and the maximum value of a voltage imbalance rate. It is a flowchart which shows operation | movement of the unbalance suppression apparatus in 1st Embodiment of this invention. It is a figure which shows the relationship between the reactive power adjustment amount of the object position in the 2nd Embodiment of this invention, and the maximum value of a voltage imbalance rate. It is a figure which shows the relationship between the reactive power adjustment amount of the object position in 3rd Embodiment of this invention, and the average value of a voltage imbalance rate. It is a figure which shows the relationship between the reactive power adjustment amount of the object position in 4th Embodiment of this invention, and the average value of a voltage imbalance rate.

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

[First embodiment]
=== Distribution system ===
Hereinafter, the power distribution system in the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a power distribution system in the present embodiment.

  The distribution system 100 is a power system for supplying power to the loads R1 to R4. The power distribution system 100 includes a distribution transformer 101, a distribution line L100, loads R1 to R4, switches LS1 and LS2, and an unbalance suppression device 3 (reactive power adjustment device installation position and adjustment amount determination device). Note that a plurality of switches and loads are provided in the power distribution system 100, respectively. For convenience of explanation, it is assumed that two switches and four loads are provided.

  The distribution transformer 101 is a device that transforms, for example, a primary side voltage at a predetermined transformation ratio and outputs the transformed voltage from the secondary side. The primary side of distribution transformer 101 is connected to one end of transmission line L200. The secondary side of distribution transformer 101 is connected to one end of distribution line L100.

  The distribution line L100 is a three-phase distribution line for supplying power from the distribution transformer 101 to the loads R1 to R4, and extends from the upstream distribution transformer 101 toward the downstream end 102. . Distribution line L100 is a power line for supplying U-phase, V-phase, and W-phase three-phase AC power from distribution transformer 101. The distribution line L100 includes a distribution line L1 that supplies U-phase power, a distribution line L2 that supplies V-phase power, and a distribution line L3 that supplies W-phase power.

  The switches LS1 and LS2 are switches provided with a measurement function, for example, provided in the distribution line L100. Each of the switches LS1 and LS2 measures the line current, the line voltage, and the power factor of each phase at a certain time in the position where the switches LS1 and LS2 are provided in the distribution line L100, and shows the measurement results. Signals S1 and S2 are output.

  The loads R1 to R4 are power loads such as lamp loads connected to the distribution line L100. The loads R1 to R4 are connected to any two-phase (two) distribution lines among the distribution lines L1 to L3 at nodes 71 to 74, respectively, and supplied with power.

  The unbalance suppression device 3 is a device for suppressing voltage imbalance of the distribution line L100. The unbalance suppression device 3 is based on the information shown in the measurement signals S1 and S2 in order to suppress the installation position of the reactive power compensation device (not shown) and the voltage imbalance of the distribution line L100. A value of reactive power to be adjusted by the reactive power compensation device (also referred to as “target reactive power adjustment amount”) is determined.

  The reactive power compensation device (reactive power adjustment device) is a device that adjusts the reactive power at the position where the reactive power compensation device is installed in the distribution line L100 to reduce the voltage imbalance rate of the distribution line L100. . The reactive power compensation device includes, for example, an SVC (Static Var Compensator), a power capacitor, a shunt reactor, and the like. The reactive power compensation device has a capacity determined for each reactive power compensation device.

  A capacity | capacitance is an apparatus capacity | capacitance of the said reactive power compensation apparatus corresponding to the maximum of the value of the reactive power adjusted by the reactive power compensation apparatus. For example, when the capacity of the reactive power compensation device is 200 (kVar), the maximum value of the reactive power that can be adjusted by the reactive power compensation device is 200 (kVar). In order to suppress the voltage imbalance of the distribution line L100, it is desirable to provide the distribution system 100 with a reactive power compensation device having a capacity equal to or greater than the target reactive power adjustment amount determined by the unbalance suppression device 3.

=== Unbalance suppression device ===
Hereinafter, with reference to FIG.2 and FIG.3, the unbalance suppression apparatus in this embodiment is demonstrated. FIG. 2 is a block diagram showing hardware of the unbalance suppression device in the present embodiment. FIG. 3 is a block diagram showing the unbalance suppression apparatus in the present embodiment.

  The unbalance suppression device 3 includes a CPU (Central Processing Unit) 31, a communication device 32, a storage device 33, a display device 34, and an input device 35. The CPU 31 implements various functions of the unbalance suppression device 3 by executing a program stored in the storage device 33, and performs overall control of the unbalance suppression device 3. The storage device 33 stores the above-described program and various types of information. The various information includes information about the distribution system 100 for calculating the voltage imbalance rate of the distribution line L100 and the reactive power adjustment amount of the target positions 61 to 64. The display device 34 is a display that displays information on the unbalance suppression device 3. The input device 35 is, for example, a keyboard or a mouse for inputting information to the unbalance suppression device 3. The communication device 32 communicates with various devices including the switches LS1 and LS2 via the network 300.

  The unbalance suppression device 3 further includes a position selection unit 36 (second and fourth arithmetic units, first determination unit), a reference amount calculation unit 37 (first and third arithmetic units), and an adjustment amount determination unit 38 (first unit). 2 determination device) and a confirmation unit 39 (also referred to as “various functions of the unbalance suppression device 3”). The various functions of the unbalance suppression device 3 are realized by the CPU 31 executing programs stored in the storage device 33.

  The position selection unit 36 determines the installation position of the reactive power compensator. The reference amount calculation unit 37 calculates the reactive power adjustment amount and the reference reactive power adjustment amount at the target positions 61 to 64. The adjustment amount determination unit 38 determines a target reactive power adjustment amount (adjustment amount). The confirmation unit 39 calculates the voltage unbalance rate of the distribution line L100 after the reactive power compensation device is installed, and confirms that the voltage unbalance rate of the distribution line L100 is reduced by the installation of the reactive power compensation device. .

=== Location selection part ===
Hereinafter, with reference to FIGS. 4 and 5, the position selection unit in the present embodiment will be described. FIG. 4 is a diagram illustrating a power distribution system and target positions in the present embodiment. Although there are three distribution lines L100 as shown in FIG. 1, they are shown as one line for convenience of explanation. FIG. 5 is a diagram showing the voltage imbalance rate at each position of the distribution line in the present embodiment.

= Target position =
The target positions 61 to 64 are positions that are candidates as installation positions of the reactive power compensation device. For convenience of explanation, four target positions 61 to 64 are shown, but may be two, three, or five or more, for example. The target positions 61 to 64 may be specified by, for example, inputting information to the unbalance suppression device 3 by the user of the unbalance suppression device 3.

= Voltage imbalance rate at each position (FIG. 5) =
The horizontal axis in FIG. 5 corresponds to each position in the distribution line L100. The distribution transformer 101 on the horizontal axis corresponds to the position of one end of the distribution line L100 on the side connected to the distribution transformer 101, and the target position 64 corresponds to the position of the downstream end 102 on the distribution line L100. doing. The vertical axis represents the voltage imbalance rate. Curves 610, 620, 630, and 640 indicate voltage imbalance rates from the upstream side to the downstream side of the distribution line L100 at the off-peak time T1 in one day.

  A curve 610 indicates that the reactive power compensation device is installed at the target position 61, and the reactive power having a value that makes the value of the voltage imbalance rate at the target position 61 equal to or less than a predetermined value (for example, approximately 0) is the reactive power. It shows the voltage imbalance rate when output from the compensation device. Curves 620, 630, and 640 show the same voltage imbalance rate as curve 610.

  Specifically, the curve 620 indicates that the reactive power compensation device is installed at the target position 62 and the value of the voltage imbalance rate at the target position 62 is less than a predetermined value (for example, approximately 0). The voltage imbalance rate is shown when power is output from the reactive power compensation device. A curve 630 indicates that the reactive power having a value such that the reactive power compensation device is installed at the target position 63 and the voltage imbalance rate at the target position 63 is equal to or less than a predetermined value (for example, approximately 0). It shows the voltage imbalance rate when output from the compensation device. A curve 640 indicates that the reactive power compensation device is installed at the target position 64 and the reactive power having a value that makes the value of the voltage imbalance rate at the target position 64 equal to or less than a predetermined value (for example, approximately 0) is the reactive power. It shows the voltage imbalance rate when output from the compensation device.

  It should be noted that the reactive power values at which the voltage unbalance rate values at the target positions 61 to 64 are less than or equal to a predetermined value (for example, approximately 0) are also referred to as reactive power adjustment amounts at the target positions 61 to 64, respectively. The reactive power adjustment amounts of the target positions 61 to 64 are calculated by the reference amount calculation unit 37, respectively.

= Installation position selection by position selection unit =
The position selection unit 36 applies reactive power to each of the target positions 61 to 64 based on the information shown in the measurement signals S1 and S2 received by the unbalance suppression device 3 and various information stored in the storage device 33. The voltage unbalance rate of the distribution line L100 when the compensation device is installed is calculated. The calculation result by the position selection unit 36 is a voltage imbalance rate shown in curves 610, 620, 630, and 640, for example.

  The position selection part 36 calculates the voltage imbalance rate of the distribution line L100 based on Formula (1) thru | or Formula (4).

尚、Ｖ１は正相電圧を示し、Ｖ２は逆相電圧を示し、Ｖｕｖは配電線Ｌ１、Ｌ２の相間電圧を示し、Ｖｗｕは配電線Ｌ１、Ｌ３の相間電圧を示し、Ｖｖｗは配電線Ｌ２、Ｌ３の相間電圧を示している。

V1 indicates a normal phase voltage, V2 indicates a reverse phase voltage, Vuv indicates an interphase voltage between the distribution lines L1 and L2, Vwu indicates an interphase voltage between the distribution lines L1 and L3, and Vvw indicates a distribution line L2. The interphase voltage of L3 is shown.

<Calculation of Voltage Unbalance Ratio Shown in Curve 610>
The position selection unit 36 assumes that the reactive power compensation device is installed at the target position 61 and that reactive power having a value corresponding to the reactive power adjustment amount at the target position 61 is output from the reactive power compensation device. The interphase voltage at each position of the electric wire L100 is calculated. For example, the position selection unit 36 calculates the interphase voltage based on the line impedance of the distribution line L100 and the information shown in the measurement signals S1 and S2. The position selection unit 36 may calculate the interphase voltage using information indicated in the measurement signal output from the switch close to the position where the interphase voltage is to be calculated, of the switches LS1 and LS2. Good. Thereafter, the position selection unit 36 calculates the voltage imbalance rate by applying the calculated interphase voltage to Equations 1 to 4. The calculation result is, for example, a voltage imbalance rate indicated by a curve 610.

  For example, the position selection unit 36 may calculate the voltage imbalance rate of the distribution line L100 using a symmetric coordinate method or using a predetermined power flow calculation program.

<Calculation of voltage unbalance rate shown in curves 620, 630, 640>
The configuration in which the position selection unit 36 calculates the voltage unbalance rate indicated by the curves 620, 630, and 640 is the same as the configuration in which the position selection unit 36 calculates the voltage unbalance rate indicated by the curve 610. Is omitted.

<Selection of installation position>
The position selection unit 36 determines the target position at the voltage unbalance rate at which the maximum value among the voltage unbalance ratios corresponding to the target positions is minimum as the installation position of the reactive power compensator. Specifically, for example, the minimum of the maximum values E22, E0, E23, and E24 of the curves 601, 620, 630, and 640 is E0. Therefore, the position selection unit 36 determines the target position 62 corresponding to the curve 620 whose maximum value is E0 as the installation position of the reactive power compensator.

=== Reference amount calculation unit ===
Hereinafter, with reference to FIG. 4, the reference amount calculation unit in the present embodiment will be described.

  After calculating the reactive power adjustment amount at the target positions 61 to 64, the reference amount calculation unit 37 determines one reactive power adjustment amount among the reactive power adjustment amounts at the target positions 61 to 64 as the reference reactive power adjustment amount. The reference reactive power adjustment amount is a reference amount for calculating the target reactive power adjustment amount.

<Reactive power adjustment amount of target position 62>
The reference amount calculation unit 37 applies, for example, the information shown in the measurement signals S1 and S2 received by the unbalance suppression device 3 and the various information stored in the storage device 33 to Equations 3 to 6. The reactive power adjustment amount of the target position 62 is calculated.

尚、ＩＡＦは、例えば、対象位置６２における逆相電圧を打ち消すのに必要な電流に対応している。Ｚは、配電用変圧器１０１のインピーダンスと、配電線Ｌ１００における対象位置と配電用変圧器１０１との間の線路インピーダンスとの和である。例えば、対象位置６２の無効電力調整量を算出する場合、配電用変圧器１０１のインピーダンスと、対象位置６２と配電用変圧器１０１との間の線路インピーダンスＺ２との和がＺとなる。配電線Ｌ１００の定格電圧は、予め定められており例えば６６００（Ｖ）である。

The IAF corresponds to, for example, a current necessary for canceling the negative phase voltage at the target position 62. Z is the sum of the impedance of the distribution transformer 101 and the line impedance between the target position in the distribution line L100 and the distribution transformer 101. For example, when calculating the reactive power adjustment amount of the target position 62, the sum of the impedance of the distribution transformer 101 and the line impedance Z2 between the target position 62 and the distribution transformer 101 is Z. The rated voltage of the distribution line L100 is determined in advance, for example, 6600 (V).

<Adjustment amount of reactive power at target positions 61, 63, 64>
The configuration in which the reference amount calculation unit 37 calculates the reactive power adjustment amount of the target position target positions 61, 63, and 64 is the same as the configuration in which the reference amount calculation unit 37 calculates the reactive power adjustment amount of the target position target position 62. Therefore, the description is omitted.

<Reference reactive power adjustment amount>
The reference amount calculation unit 37 determines the reactive power adjustment amount at the target position corresponding to the installation position determined by the position selection unit 36 as the reference reactive power adjustment amount. Specifically, for example, when the target position 62 is determined as the installation position of the reactive power compensator, the reference amount calculation unit 37 determines the reactive power adjustment amount at the target position 62 as the reference reactive power adjustment amount.

=== Adjustment amount determination unit ===
Hereinafter, the adjustment amount determination unit according to the present embodiment will be described with reference to FIGS. 4 to 7. The adjustment amount determining unit 38 determines the target reactive power adjustment amount when the target position 62 is determined as the installation position, and the adjustment amount when the target positions 61, 63, and 64 are determined as the installation positions. Since the determination unit 38 is the same as the configuration for determining the target reactive power adjustment amount, only the configuration in which the adjustment amount determination unit 38 determines the target reactive power adjustment amount when the target position 62 is determined as the installation position will be described. Description of the configuration in which the adjustment amount determining unit 38 determines the target reactive power adjustment amount when the target positions 61, 63, and 64 are determined as the installation positions will be omitted.

  FIG. 6 is a diagram showing the maximum value of the voltage imbalance rate at each time in the present embodiment. FIG. 7 is a diagram illustrating a relationship between the reactive power adjustment amount at the target position and the maximum value of the voltage imbalance rate in the present embodiment.

  6 and 7, a reactive power compensation device is provided at the target position 62 as the installation position, and the reactive power of H0, which is a value corresponding to the reactive power adjustment amount at the target position 62 as the reference reactive power adjustment amount, is obtained. The maximum value of the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 when the reactive power compensation device is output is shown.

  E0, F0, and G0 are voltage imbalances from the upstream side to the downstream side of the distribution line L100 when reactive power having a value corresponding to H0 as the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The maximum value is shown. E0, F0, and G0 respectively indicate the maximum values at the off-peak time T1, the peak time T2, and the night time T3 in one day. Note that the maximum value of the voltage imbalance rate fluctuates during times T1 to T3 is based on, for example, fluctuations in power consumption due to loads R1 to R4.

  E1, F1, and G1 (FIG. 7) are distribution lines L100 when reactive power having a value corresponding to H1 as a value corresponding to H0 that is the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The maximum value of the voltage imbalance rate from the upstream side to the downstream side is shown. E2, F2, and G2 are from the upstream side of the distribution line L100 when reactive power having a value corresponding to H2 as a value corresponding to H0 that is the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The maximum value of the voltage imbalance rate over the downstream side is shown. E3, F3, and G3 are from the upstream side of the distribution line L100 when reactive power having a value corresponding to H3 as a value corresponding to H0 that is the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The maximum value of the voltage imbalance rate over the downstream side is shown. E4, F4, and G4 are from the upstream side of the distribution line L100 when reactive power having a value corresponding to H4 as a value corresponding to H0 that is the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The maximum value of the voltage imbalance rate over the downstream side is shown. E1 to E4 indicate the maximum value of time T1, F1 to F4 indicate the maximum value of time T2, and G1 to G4 indicate the maximum value of time T3.

<Calculation of maximum value of voltage imbalance ratio>
The adjustment amount determination unit 38 calculates E0, F0, and G0. For example, the adjustment amount determination unit 38 calculates the voltage unbalance rate from the upstream side to the downstream side of the distribution line L100 in the same manner as the position selection unit 36, and then, based on the calculation result, E0, F0, G0. May be calculated. Furthermore, the adjustment amount determination unit 38 selects the maximum value among E0, F0, and G0. For example, when the maximum value among E0, F0, and G0 is E0, the adjustment amount determination unit 38 selects E0 as the maximum value among E0, F0, and G0.

  The adjustment amount determination unit 38 changes the value of the reactive power output from the power compensation device from the value corresponding to H0 to the value corresponding to H1, calculates E1, F1, G1, and then E1, F1, G1. For example, G1 is selected as the maximum value. The adjustment amount determination unit 38 changes the value of the reactive power output from the power compensation device from the value corresponding to H1 to the value corresponding to H2, and calculates E2, F2, G2, and then E2, F2, G2 For example, F2 is selected as the maximum value. The adjustment amount determination unit 38 calculates E3, F3, G3 by changing the value of reactive power output from the power compensation device from a value corresponding to H2 to a value corresponding to H3, and then E3, F3, G3. For example, E3 is selected as the maximum value. The adjustment amount determination unit 38 calculates E4, F4, and G4 by changing the reactive power value output from the power compensation device from the value corresponding to H3 to the value corresponding to H4, and then calculates E4, F4, and G4. For example, F4 is selected as the maximum value.

  Note that H1 to H4 are values within a predetermined range including H0. The predetermined range may be specified by, for example, inputting information to the unbalance suppression device 3 by a user of the unbalance suppression device 3. Further, the predetermined range may be determined based on the specifications of reactive power compensation devices as candidates provided in the distribution system 100. Further, for example, H1 to H4 may be calculated by an expression shown in FIG. For example, H10 in FIG. 7 is a positive value and may be about 5% of H0. In addition, although H1 thru | or H4 is four, for example, multiple pieces other than four may be sufficient.

<Determination of target reactive power adjustment amount>
Thereafter, the adjustment amount determination unit 38 determines the reactive power adjustment amount corresponding to the minimum value among F2, G1, E0, E3, and F4 as the target reactive power adjustment amount. For example, when G1 of F2, G1, E0, E3, and F4 is the minimum value, the adjustment amount determination unit 38 determines H1 corresponding to G1 as the target reactive power adjustment amount.

=== Operation ===
Hereinafter, with reference to FIG. 8, the operation of the unbalance suppression apparatus according to the present embodiment will be described. FIG. 8 is a flowchart showing the operation of the unbalance suppression apparatus in the present embodiment.

  The unbalance suppression device 3 acquires various information (step St11). Various information may be input to the unbalance suppression device 3 via the input device 35 and the communication device 32.

  The reference amount calculation unit 37 calculates the reactive power adjustment amount for the target positions 61 to 64 (step St12). The position selection unit 36 determines the installation position of the reactive power compensator based on the calculation result of the reference amount calculation unit 37 (step St13). The reference amount calculation unit 37 determines a reference reactive power amount based on the determination result of the position selection unit 36 (step St14). The adjustment amount determination unit 38 determines a target reactive power adjustment amount based on the determination result of the reference amount calculation unit 37 and the like (step St15).

  Thereafter, the unbalance suppression device 3 may output or display information indicating the installation position and the target reactive power adjustment amount.

  For example, based on information indicating the installation position and the target reactive power adjustment amount, the user of the unbalance suppression device 3 outputs reactive power equal to or greater than the value indicated in the target reactive power adjustment amount indicated in the information. Select a reactive power compensator that can be used, and install the selected reactive power compensator at the installation position. For example, when the value of the target reactive power adjustment amount is H1 (for example, 342.4 (kVar)) and the installation position is the target position 62, the user of the unbalance suppression device 3 has a capacity of 200 (kVar). Two reactive power compensation devices are installed at the target position 62. Thereafter, the user of the unbalance suppression device 3 uses the function of the confirmation unit 39 of the unbalance suppression device 3 to confirm that the voltage unbalance rate of the distribution line L100 is reduced by the installation of the reactive power compensation device.

[Second Embodiment]
The unbalance suppression device 3B (FIG. 3) in the second embodiment is obtained by changing the adjustment amount determination unit 38 of the unbalance suppression device 3 in the first embodiment to an adjustment amount determination unit 38B. The configuration other than the adjustment amount determination unit 38B in the unbalance suppression device 3B is the same as the configuration of the unbalance suppression device 3.

=== Adjustment amount determination unit ===
Hereinafter, with reference to FIGS. 3 and 9, the adjustment amount determination unit in the present embodiment will be described. FIG. 9 is a diagram illustrating a relationship between the reactive power adjustment amount at the target position and the maximum value of the voltage imbalance rate in the present embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to FIG. 7, and the description is abbreviate | omitted.

  The adjustment amount determination unit 38B calculates J0 as an average value of E0, F0, and G0. The adjustment amount determination unit B calculates J1 as an average value of E1, F1, and G1. The adjustment amount determination unit 38B calculates J2 as an average value of E2, F2, and G2. The adjustment amount determination unit 38B calculates J3 as an average value of E3, F3, and G3. The adjustment amount determination unit 38B calculates J4 as an average value of E4, F4, and G4.

  Thereafter, the adjustment amount determination unit 38B determines the reactive power adjustment amount corresponding to the minimum value among J0 to J4 as the target reactive power adjustment amount. For example, when J1 among J0 to J4 is the minimum value, the adjustment amount determination unit 38B determines H1 corresponding to J1 as the target reactive power adjustment amount.

[Third embodiment]
The unbalance suppression device 3C (FIG. 3) in the third embodiment is obtained by changing the adjustment amount determination unit 38 of the unbalance suppression device 3 in the first embodiment to an adjustment amount determination unit 38C. The configuration other than the adjustment amount determination unit 38C in the unbalance suppression device 3C is the same as the configuration of the unbalance suppression device 3.

=== Adjustment amount determination unit ===
Hereinafter, with reference to FIG. 3 and FIG. 10, the adjustment amount determination unit in the present embodiment will be described. FIG. 10 is a diagram showing the relationship between the reactive power adjustment amount at the target position and the average value of the voltage imbalance rate in the present embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to FIG. 7, and the description is abbreviate | omitted.

  In FIG. 10, for example, a reactive power compensation device is provided at the target position 62 as the installation position, and according to the value of H0 that is a value corresponding to the reactive power adjustment amount at the target position 62 as the reference reactive power adjustment amount. The average value of the voltage imbalance ratio from the upstream side of the distribution line L100 to the downstream side when the reactive power of the value is output from the reactive power compensation device is shown.

  E10, F10, and G10 are voltage imbalances from the upstream side to the downstream side in the distribution line L100 when reactive power having a value corresponding to H0 as the value of the reference reactive power adjustment amount is output from the reactive power compensation device. The average value of the rate is shown. E11, F11, and G11 indicate the average value of the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 when reactive power having a value corresponding to H1 is output from the reactive power compensation device. E12, F12, and G12 indicate the average value of the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 when reactive power having a value corresponding to H2 is output from the reactive power compensation device. E13, F13, and G13 indicate the average value of the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 when reactive power having a value corresponding to H3 is output from the reactive power compensation device. E14, F14, and G14 indicate the average value of the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 when reactive power having a value corresponding to H4 is output from the reactive power compensation device. E10 to E14 indicate the average value of time T1, F10 to F14 indicate the average value of time T2, and G10 to G14 indicate the average value of time T3.

  The adjustment amount determination unit 38C calculates E10, F10, and G10. For example, the adjustment amount determination unit 38C calculates the voltage imbalance rate from the upstream side to the downstream side of the distribution line L100 in the same manner as the position selection unit 36, and then, based on the calculation result, E10, F10, G10 Is calculated. The adjustment amount determination unit 38C selects, for example, E10 as the maximum value among E0, F0, and G0.

  After calculating E11, F11, and G11, the adjustment amount determining unit 38C selects, for example, G11 as the maximum value among E11, F11, and G11. The adjustment amount determination unit 38C selects, for example, F12 as the maximum value among E12, F12, and G12. After calculating E13, F13, and G13, the adjustment amount determination unit 38C selects, for example, E13 as the maximum value of E13, F13, and G13. After calculating E14, F14, and G14, the adjustment amount determination unit 38C selects, for example, F14 as the maximum value of E14, F14, and G14.

  Thereafter, the adjustment amount determination unit 38C determines the reactive power adjustment amount corresponding to the minimum value among F12, G11, E10, E13, and F14 as the target reactive power adjustment amount. For example, when G11 of F12, G11, E10, E13, and F14 is the minimum value, the capacity selection unit 38C determines the capacity H1 corresponding to G11 as the target reactive power adjustment amount.

[Fourth embodiment]
The unbalance suppression device 3D (FIG. 3) in the fourth embodiment is obtained by changing the adjustment amount determination unit 38C of the unbalance suppression device 3C in the third embodiment to an adjustment amount determination unit 38D. The configuration other than the adjustment amount determination unit 38D in the unbalance suppression device 3D is the same as the configuration of the unbalance suppression device 3C.

=== Adjustment amount determination unit ===
Hereinafter, with reference to FIG. 3 and FIG. 11, the adjustment amount determination unit in the present embodiment will be described. FIG. 11 is a diagram illustrating the relationship between the reactive power adjustment amount at the target position and the average value of the voltage imbalance rate in the present embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to FIG. 10, and the description is abbreviate | omitted.

  The adjustment amount determination unit 38D calculates J10 as an average value of E10, F10, and G10. The adjustment amount determination unit 38D calculates J11 as an average value of E11, F11, and G11. The adjustment amount determination unit 38D calculates J12 as an average value of E12, F12, and G12. The adjustment amount determination unit 38D calculates J13 as an average value of E13, F13, and G13. The adjustment amount determination unit 38D calculates J14 as an average value of E14, F14, and G14.

  Thereafter, the adjustment amount determination unit 38D determines the capacity reactive power adjustment amount corresponding to the minimum value among J10 to J14 as the target reactive power adjustment amount. For example, when J11 of J10 to J14 is the minimum value, the adjustment amount determination unit 38D determines the capacity H1 corresponding to J1 as the target reactive power adjustment amount.

  As described above, the unbalance suppression device 3 has the target reactive power adjustment indicating the installation position of the reactive power compensation device that adjusts the reactive power of the distribution line L100 and the value of the reactive power to be adjusted by the reactive power compensation device. Determine the amount. The unbalance suppression device 3 includes a position selection unit 36, a reference amount calculation unit 37, and an adjustment amount determination unit 38. For example, the reference amount calculation unit 37 is based on the output of the reactive power compensator installed at the target position 61 so that the value of the voltage imbalance rate at the target position 61 is equal to or less than a predetermined value (for example, approximately 0). The reactive power adjustment amount of the target position 61 indicating the reactive power value of the target position 61 to be adjusted is calculated. The position selection unit 36 assumes that the reactive power compensation device is installed at the target position 61 and that reactive power having a value corresponding to the reactive power adjustment amount at the target position 61 is output from the reactive power compensation device. A voltage unbalance rate (also referred to as “first voltage unbalance rate”) from the upstream side to the downstream side of the electric wire L100 is calculated. For example, the reference amount calculation unit 37 is based on the output of the reactive power compensation device installed at the target position 62 such that the value of the voltage imbalance rate at the target position 62 is equal to or less than a predetermined value (for example, approximately 0). The reactive power adjustment amount of the target position 62 indicating the reactive power value of the target position 62 to be adjusted is calculated. The position selection unit 36 assumes that the reactive power compensation device is installed at the target position 62 and that reactive power having a value corresponding to the reactive power adjustment amount at the target position 62 is output from the reactive power compensation device. A voltage unbalance rate (also referred to as “second voltage unbalance rate”) from the upstream side to the downstream side of the electric wire L100 is calculated. The position selection unit 36 determines the installation position of the reactive power compensation device based on the calculated first and second voltage imbalance ratios. The adjustment amount determination unit 38 determines a target reactive power adjustment amount based on the installation position determined by the position selection unit 36 and the calculated reactive power adjustment amounts of the target positions 61 and 62. Accordingly, the installation position of the reactive power compensation device and the target reactive power adjustment amount can be determined. Based on the determination result of the unbalance suppression device 3, a reactive power compensation device having a capacity equal to or greater than the target reactive power adjustment amount is selected, and the selected reactive power compensation device is installed at the installation position. The voltage imbalance rate can be reduced. Moreover, it is possible to prevent the reactive power compensation device from being installed more than necessary for the distribution line L100, and to reduce the amount of capital investment for the reactive power compensation device.

  When the maximum value of the first voltage unbalance rate is smaller than the maximum value of the second voltage unbalance rate, the position selection unit 36 determines the target position 61 as the installation position of the reactive power compensation device. When the maximum value of the first voltage unbalance rate is larger than the maximum value of the second voltage unbalance rate, the position selection unit 36 determines the target position 62 as the installation position of the reactive power compensation device. Therefore, the installation position can be determined relatively easily and reliably based on the maximum value of the first and second voltage imbalance ratios.

  When the target position 61 is determined as the installation position of the reactive power compensation device, the adjustment amount determining unit 38 determines an amount corresponding to the reactive power adjustment amount at the target position 61 as the target reactive power adjustment amount. When the target position 62 is determined as the installation position of the reactive power compensation device, the adjustment amount determination unit 38 determines an amount corresponding to the reactive power adjustment amount at the target position 62 as the target reactive power adjustment amount. Therefore, the target reactive power adjustment amount can be determined relatively easily and reliably based on the installation position.

  Further, the adjustment amount determination unit 38 upstream of the distribution line L100 when the reactive power is adjusted based on, for example, H1 indicating the reactive power adjustment amount within a predetermined range including H0 as the value of the reference reactive power adjustment amount. The maximum value (for example, G1 in FIG. 7) of the voltage imbalance rate from the side to the downstream side is calculated. The adjustment amount determination unit 38 indicates the reactive power adjustment amount within a predetermined range including H0 as the value of the reference reactive power adjustment amount. For example, the distribution line L100 when the reactive power is adjusted based on H2 different from H1. The maximum value (for example, F2) of the voltage imbalance rate from the upstream side to the downstream side is calculated. For example, when G1 is smaller than F2, the adjustment amount determination unit 38 determines H1 as the target reactive power adjustment amount. For example, when G1 is larger than F2, the adjustment amount determination unit 38 determines H2 as the target reactive power adjustment amount. Accordingly, the reactive power adjustment amount can be changed within the predetermined range, and the optimum reactive power adjustment amount can be determined as the target reactive power adjustment amount. That is, the target reactive power adjustment amount that can reliably reduce the voltage imbalance rate of the distribution line L100 can be determined.

  Further, the adjustment amount determination unit 38 sets G1, which is the larger of F1 at time T2 and G1 at time T3, to the upstream side of the distribution line L100 when reactive power is adjusted based on H1. To the maximum value of the voltage imbalance rate from the downstream side to the downstream side. The adjustment amount determining unit 38 sets F2 which is the larger of F2 at time T2 and G2 at time T3 from the upstream side of the distribution line L100 when reactive power is adjusted based on H2. The maximum value of the voltage imbalance rate over the side. Therefore, for example, the target reactive power adjustment amount can be determined in consideration of fluctuations in the voltage imbalance rate of the distribution line L100 based on the power consumption of the loads R1 to R4 that vary with time.

  In addition, the said 1st thru | or 4th embodiment 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 the first embodiment, description will be given of the case where the reference amount calculation unit 37 calculates a reactive power value such that the value of the voltage imbalance rate at the target positions 61 to 64 is equal to or less than a predetermined value (for example, approximately 0). However, the present invention is not limited to this. For example, the reference amount calculation unit 37 may calculate a value of reactive power such that the voltage unbalance rate values at the target positions 61 to 64 are different from each other and set to a value larger than zero. Further, the predetermined value is 3 (%), for example, and may be designated by input of information to the unbalance suppression device 3 by a user of the unbalance suppression device 3.

  In the first embodiment, it has been described that the target position at the voltage unbalance rate at which the maximum value among the voltage unbalance rates corresponding to each target position is the minimum is set as the installation position of the reactive power compensator. However, the present invention is not limited to this. For example, the target position at the voltage unbalance rate where the maximum value among the voltage unbalance rates corresponding to each target position is the second, third, and fourth smallest may be determined as the installation position.

  In the first embodiment, the reactive power adjustment amount corresponding to the minimum value among F2, G1, E0, E3, and F4 has been described as the target reactive power adjustment amount. However, the present invention is not limited to this. It is not a thing. For example, the reactive power adjustment amount corresponding to the second, third, and fourth smallest values of F2, G1, E0, E3, and F4 may be determined as the target reactive power adjustment amount. Further, the unbalance suppression device 3 may determine a plurality of installation positions and target reactive power adjustment amounts.

3, 3B, 3C, 3D Unbalance suppression device 36 Position selection unit 37 Reference amount calculation unit 38, 38B, 38C, 38D Adjustment amount determination unit L1, L2, L3, L100 Distribution line

Claims (7)

Reactive power adjustment device installation position and adjustment amount determination method for determining the reactive power adjustment device installation position for adjusting the reactive power of a three-phase distribution line and the reactive power adjustment amount to be adjusted by the reactive power adjustment device Because
A first step of calculating a first reactive power adjustment amount at the first position such that a value of a voltage unbalance rate at the first position of the three-phase distribution line is equal to or less than a first value;
A second step of calculating a first voltage imbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the first reactive power adjustment amount; When,
A third step of calculating a second reactive power adjustment amount at the second position so that a third arithmetic unit has a voltage unbalance rate value at the second position of the three-phase distribution line equal to or less than a second value;
A fourth step in which the fourth arithmetic unit calculates a second voltage imbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the second reactive power adjustment amount; When,
A first step in which the first determining device determines the installation position based on the calculation results of the second and fourth steps;
The second determination device includes a calculation result of the first and third steps, and a sixth step of determining the adjustment amount based on the determination result of the fifth step. Installation position and adjustment amount determination method. In the fifth step, when the maximum value of the first voltage unbalance rate is smaller than the maximum value of the second voltage unbalance rate, the first position is set as the installation position, and the first voltage unbalance rate is determined. The installation position and the adjustment amount of the reactive power adjustment device according to claim 1, wherein the second position is determined as the installation position when a maximum value of the second voltage is greater than a maximum value of the second voltage imbalance rate. Decision method. The sixth step includes
When the first position is determined as the installation position, a seventh step of determining an amount corresponding to the first reactive power adjustment amount as the adjustment amount;
The 8th step which defines the amount according to the 2nd reactive power adjustment amount as said adjustment amount when said 2nd position is defined as said installation position. A reactive power adjustment device installation position and adjustment amount determination method. The seventh step includes
A third voltage imbalance from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on a third reactive power adjustment amount within a first range including the first reactive power adjustment amount. A ninth step of calculating a first maximum value of the rate;
A fourth voltage from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on a fourth reactive power adjustment amount different from the third reactive power adjustment amount in the first range. A tenth step of calculating a second maximum value of the unbalance rate;
When the first maximum value is smaller than the second maximum value, the third reactive power adjustment amount is determined as the adjustment amount, and when the first maximum value is larger than the second maximum value, the fourth invalidity An eleventh step of determining a power adjustment amount as the adjustment amount;
The eighth step includes
A fifth voltage imbalance from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on a fifth reactive power adjustment amount within a second range including the second reactive power adjustment amount. A twelfth step of calculating a third maximum value of the rate;
A sixth voltage from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on a sixth reactive power adjustment amount different from the fifth reactive power adjustment amount in the second range. A thirteenth step of calculating a fourth maximum value of the unbalance rate;
When the third maximum value is smaller than the fourth maximum value, the fifth reactive power adjustment amount is set as the adjustment amount, and when the third maximum value is larger than the fourth maximum value, the sixth invalid power adjustment amount is determined. 14. A step of determining a power adjustment amount as the adjustment amount, comprising: a reactive power adjustment device installation position and an adjustment amount determination method according to claim 3. The ninth step includes the maximum value of the third voltage imbalance rate in the first time of the day and the maximum value of the third voltage imbalance rate in the second time different from the first time in the day. Is calculated as the first maximum value,
In the tenth step, a larger one of the maximum value of the fourth voltage imbalance rate in the first time and the maximum value of the fourth voltage imbalance rate in the second time is calculated as the second maximum value. And
In the twelfth step, a larger one of the maximum value of the fifth voltage imbalance rate in the first time and the maximum value of the fifth voltage imbalance rate in the second time is calculated as the third maximum value. And
In the thirteenth step, a larger one of the maximum value of the sixth voltage imbalance ratio in the first time and the maximum value of the sixth voltage imbalance ratio in the second time is calculated as the fourth maximum value. The installation position of the reactive power adjustment device and the adjustment amount determination method according to claim 4. Reactive power adjustment device installation position and adjustment amount determination device for determining the reactive power adjustment device installation position for adjusting the reactive power of a three-phase distribution line and the reactive power adjustment amount to be adjusted by the reactive power adjustment device In addition,
A first function for calculating a first reactive power adjustment amount at the first position such that the value of the voltage imbalance rate at the first position of the three-phase distribution line is equal to or less than the first value;
A second function for calculating a first voltage imbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the first reactive power adjustment amount;
A third function for calculating the second reactive power adjustment amount at the second position so that the value of the voltage unbalance rate at the second position of the three-phase distribution line is equal to or less than the second value;
A fourth function for calculating a second voltage imbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the second reactive power adjustment amount;
A fifth function for determining the installation position based on the calculation results of the second and fourth functions;
A sixth function for determining the adjustment amount based on a calculation result of the first and third functions and a determination result of the fifth function;
A program that realizes Reactive power adjustment device installation position and adjustment amount determination device for determining the reactive power adjustment device installation position for adjusting the reactive power of a three-phase distribution line and the reactive power adjustment amount to be adjusted by the reactive power adjustment device Because
A first computing device that computes the first reactive power adjustment amount at the first position so that the value of the voltage unbalance rate at the first position of the three-phase distribution line is equal to or less than the first value;
A second arithmetic unit that calculates a first voltage unbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the first reactive power adjustment amount;
A third arithmetic unit that calculates the second reactive power adjustment amount at the second position so that the value of the voltage unbalance rate at the second position of the three-phase distribution line is equal to or less than the second value;
A fourth arithmetic unit that calculates a second voltage imbalance rate from the upstream side to the downstream side of the three-phase distribution line when the reactive power is adjusted based on the second reactive power adjustment amount;
A first determination device for determining the installation position based on the calculation results of the second and fourth calculation devices;
A second determination device for determining the adjustment amount based on the calculation results of the first and third calculation devices and the determination result of the first determination device;
A reactive power adjustment device installation position and adjustment amount determination device characterized by comprising:

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