JP6877295B2 - Judgment method of voltage regulator and voltage regulator - Google Patents

Description

The present invention relates to a voltage regulator installed in a distribution system.

For example, an automatic voltage regulator (Step Voltage) for distribution installed in the middle of a distribution line connecting a substation that supplies electric power (hereinafter referred to as "power substation") and a consumer (load) that consumes the electric power. A regulator (hereinafter referred to as "SVR") is a power device that automatically controls the voltage of a distribution line, which constantly fluctuates due to an increase or decrease in load, within a specified allowable voltage range. In SVR, it is assumed that the voltage on the line side where the power supply substation exists (hereinafter referred to as "power supply side voltage") is stabilized to the specified voltage value, and the voltage on the opposite line side (hereinafter referred to as "load side voltage"). When the load side voltage is out of the allowable voltage range, the load side voltage is adjusted to the allowable voltage range by switching the tap of the tapped transformer for voltage adjustment (hereinafter referred to as "adjustment transformer"). It is configured to fit inside.

FIG. 12 is a diagram showing an example of a distribution system model in which the SVR is installed.

In the distribution system model shown in FIG. 12, the substation DS _{1 is connected to the distribution line PL 1} on one side of the SVR (left side in FIG. 12) via the circuit breaker FCB _1, and the other side of the SVR (right side in FIG. 12). is substation DS ₂ via a breaker FCB ₂ distribution line PL ₂ of the connection, the configuration of the load _{R 1} and load _{R 2} is connected in the middle of both lines distribution line PL ₁ and distribution line PL ₂ .. In the distribution system model, the circuit breaker FCB ₁ is in the “closed state” (shown in black in FIG. 12) and the circuit breaker FCB ₂ is in the “open state” (shown in white in FIG. 12) at the substation. The normal configuration is such that power is supplied _{from the DS 1} to the loads R ₁ and R _2. For example, when an accident occurs in the _{distribution line PL 1 , the circuit breakers FCB 1} and FCB ₂ are set to "open state", respectively. This is a distribution system model that can switch to the “closed state” _{and supply power from the substation DS 2} to the loads R ₁ and R _2.

FIG. 12A shows _{a power supply mode in which the circuit breaker FCB 1 is set} to the “closed state” and the circuit breaker FCB _{2 is set} to the “open state” _{to supply power from the substation DS 1} to the loads R ₁ and R ₂ (hereinafter referred to as the power supply mode). The configuration of "forward power transmission-forward power flow mode") is shown, and FIG. 12B shows the circuit breaker FCB ₁ in the "open state" and the circuit breaker FCB ₂ in the "closed state" from the _{substation DS 2.} The configuration of the power supply mode (hereinafter referred to as "reverse power transmission-reverse power flow mode") for supplying power to the _{loads R 1} and R _{2 is shown.}

Assuming that the distribution line PL ₁ is a line connected to the primary side of the SVR adjustment transformer and the distribution line PL ₂ is a line connected to the secondary side of the SVR adjustment transformer, in the forward power transmission-forward power flow mode, Substation DS ₁ becomes the power supply substation (the direction in which the power supply substation exists with respect to SVR (hereinafter referred to as the "power supply substation direction") is the primary side of the adjustment transformer), and the load side voltage is the adjustment transformer. It becomes the voltage on the secondary side of. On the other hand, in the reverse power transmission-reverse power flow mode, the substation DS ₂ becomes the power supply substation (the direction of the power supply substation is the secondary side of the adjusting transformer), and the load side voltage becomes the voltage on the primary side of the adjusting transformer.

Since the voltage to be adjusted changes depending on the power supply mode of the distribution system, the SVR has information on the direction of the power supply substation, and when the information on the direction of the power supply substation is on the secondary side, the adjusting transformer It has a primary side voltage adjustment mode that automatically adjusts the voltage on the primary side and a secondary side voltage adjustment mode that automatically adjusts the voltage on the secondary side of the adjustment transformer when the information in the direction of the power supply substation is on the primary side. ing. The SVR monitors the voltage on the secondary side of the regulating transformer in the forward power transmission-forward power flow mode, and performs a voltage adjusting operation so that the voltage does not deviate from the allowable voltage range. Further, the SVR monitors the voltage on the primary side of the adjusting transformer in the reverse power transmission-reverse power flow mode, and performs a voltage adjusting operation so that the voltage does not deviate from the allowable voltage range.

Since the SVR may change the direction of the power supply substation, for example, the direction of the power supply substation is determined each time the tap of the adjustment transformer is switched, and the SVR operates in the voltage adjustment mode according to the determination result. It has become. In the distribution system model shown in FIG. 12, the direction of the tidal current changes as the direction of the power supply substation changes. Therefore, the SVR monitors the tidal current with, for example, a built-in current transformer for instruments, and the tidal current flows. The direction of the power supply substation is determined by the direction of. Normally, the power flow flows from the power supply substation side to the load side, so if the power flow is flowing from the primary side to the secondary side of the regulating transformer, the power supply substation direction is the adjusting transformer. If it is judged that it is the primary side, the voltage adjustment operation is performed in the secondary side voltage adjustment mode, and the power flow is flowing from the secondary side to the primary side of the adjustment transformer, the direction of the power supply substation is the adjustment transformer. It is judged that it is the secondary side of, and the voltage adjustment operation is performed in the primary side voltage adjustment mode.

In recent years, as shown in FIG. 13, a _{large number of distributed power sources G 1} and G ₂ including photovoltaic power generation have been installed along with loads R ₁ and R _{2 on the distribution lines PL 1} and PL ₂ , and these are distributed. has many possible to interconnection type power G _1, G ₂ to the power distribution system. When power supplied from the distributed power supply G _1, G ₂ to the power distribution system increases, it is caused to flow direction is reversed. FIG. 13A shows a power supply mode in which the power supply from the distributed power source G _{2 installed on the distribution line PL 2 flows into the substation DS 1} side in the forward power transmission (hereinafter, “forward power transmission-reverse power flow mode””. called.) indicates, FIG. 13 (b), in the reverse power transmission, power supply mode in which electric power supply flows into the substation DS ₂ side from the distributed power supply G ₁ installed in the distribution line PL ₁ (hereinafter, "reverse Transmission-forward power flow mode ") is shown.

The method of determining the direction of the power supply substation based on the power flow is, for example, when the power flow flowing from the primary side to the secondary side of the adjusting transformer is detected, the direction of the power supply substation is determined to be the primary side of the adjusting transformer. However, when the power supply mode is the reverse transmission-forward power flow mode, the direction of the power supply substation is on the secondary side of the adjusting transformer, so the judgment is incorrect. Even if the power flow from the secondary side to the primary side of the regulating transformer is detected, the direction of the power supply substation is determined to be the secondary side of the regulating transformer, but the power supply mode is forward transmission-reverse power flow. In the case of the mode, the direction of the power supply substation is on the primary side of the adjusting transformer, so the judgment is erroneous.

Conventionally, as a method for preventing the above-mentioned erroneous determination in the direction of the power supply substation, for example, in Patent Document 1, when the SVR performs a tap switching operation, the voltage on the primary side or the secondary side of the adjusting transformer, or the voltage on both sides. A technique for detecting the amount of change before and after tap switching and determining the direction of the power supply substation using the amount of change in the voltage on the primary side and the amount of change in the voltage on the secondary side, or the amount of change in the voltage on one side is described. ing. This technology utilizes the phenomenon that the amount of change in voltage before and after tap switching is smaller than the amount of change in voltage on the line side where the power supply substation is located is smaller than the amount of change in voltage on the line side where the load is present. For example, it is a technique that compares the amount of change in voltage on the primary side with the amount of change in voltage on the secondary side, and determines that the side with the smaller amount of change in voltage is the direction of the power supply substation.

According to this technique, when the power supply mode is the forward power transmission-forward power flow mode (see FIG. 12 (a)) or the forward power transmission-reverse power flow mode (see FIG. 13 (a)), it is shown in FIG. 14 (a). As described above, since the amount of change in voltage on the primary side | Δv ₁ | before and after tap switching is smaller than the amount of change in voltage on the secondary side | Δv ₂ |, the direction of the power supply substation is on the primary side of the adjusting transformer. The correct judgment is made. When the power supply mode is reverse power transmission-reverse power flow mode (see FIG. 12 (b)) or reverse power transmission-forward power flow mode (see FIG. 13 (b)), tap as shown in FIG. 14 (b). Since the amount of change in the voltage on the secondary side | Δv ₂ | at the time of switching is smaller than the amount of change in the voltage on the primary side | Δv _{1 |} Will be done.

Japanese Patent No. 3992212

In recent years, as shown in FIG. 15, a function (constant voltage control function) for controlling the line voltage to be constant by an automatic voltage adjustment function (automatic voltage regulator function, hereinafter referred to as "AVR function") has been provided on the load side of the SVR. It is becoming more common to connect the provided power equipment. The electric power device having a constant voltage control function is, for example, a static var compensator (hereinafter referred to as “SVC”) and a power conditioning system for photovoltaic power generation (hereinafter referred to as “PCS”). ), Synchronous generator, etc.

When a power device equipped with an AVR function is connected to the load side of the SVR, the power device instantly controls to cancel the voltage fluctuation on the load side of the SVR even if the SVR switches taps to adjust the voltage. Therefore, the SVR has a problem that it cannot correctly determine the direction of the power supply substation using the amount of change in the voltage on the primary side and the amount of change in the voltage on the secondary side before and after tap switching.

When the voltage of the connected line changes significantly, the power device equipped with the AVR function instantly (for example, within 0.1 seconds) supplies invalid power to the line to keep the voltage of the line constant. It works. When a power device equipped with an AVR function controls the voltage to be constant, the amount of voltage change due to tap switching is the impedance from the voltage detection point on the primary side of the SVR to the voltage fixed point on the primary side (that is, from the SVR to the power supply substation). Impedance) and the impedance ratio from the voltage detection point on the secondary side of the SVR to the voltage fixed point on the secondary side (that is, the impedance from the SVR to the interconnection point of the power equipment that performs constant voltage control). Therefore, the amount of change in the voltage on the load side is not always larger than the amount of change in the voltage on the power supply substation side.

FIG. 16 shows an example of the amount of change in the voltage on the primary side and the amount of change in the voltage on the secondary side of the adjustment transformer when the power device equipped with the AVR function performs constant voltage control immediately after the SVR switches the tap. It is a figure which shows.

_{The voltage waveforms shown in FIG. 16A show the amount of change in the voltage on the primary side | Δv 1} | and the amount of change in the voltage on the secondary side | Δv when the power device equipped with the AVR function does not perform constant voltage control. ₂ | is a waveform, and the voltage waveform shown in FIG. 16B is the amount of change in voltage on the primary side | Δv ₁ | and the secondary side when a power device having an AVR function performs constant voltage control. It is a waveform which shows the amount of change | Δv _{2 | of the voltage.}

When a power device equipped with an AVR function controls the voltage to be constant, the amount of change in voltage between taps due to tap switching Δv is the amount of change in voltage on the primary side | Δv ₁ | and the amount of change in voltage on the secondary side | Δv. _{Since it is shared by 2} |, as shown in FIG. 16 (b), | Δv ₁ |> | Δv ₂ | may occur. In this case, the secondary side with a small amount of voltage change is the power supply substation. It will be judged as the direction.

Since the speed of constant voltage control of the power device having the AVR function is faster than the detection speed of the amount of change in the voltage in the SVR, the power device having the AVR function keeps the voltage on the secondary side constant when the SVR switches the tap. When the operation is performed, the SVR determines the difference between the voltage before tap switching and the voltage after the power device having the AVR function after tap switching performs the constant voltage control operation of the voltage on the primary side before and after tap switching. It will be detected as the amount of change and the amount of change in the voltage on the secondary side. That is, the SVR detects _{| Δv 1} | and | Δv ₂ | shown in FIG. 16 (b). For this reason, the SVR may erroneously determine that the power substation is on the secondary side, even though the power substation is on the primary side.

If the SVR makes a false judgment that the secondary side is in the direction of the power supply substation during the voltage adjustment operation in the secondary side voltage adjustment mode, it switches the voltage adjustment mode to the primary side voltage adjustment mode and powers the primary side. Despite the fact that there is a substation, the voltage on the primary side is erroneously automatically adjusted based on the information that the secondary side is in the direction of the power supply substation.

As a result, the SVR cannot adjust the voltage normally, and an uncontrollable state called "tap runaway" occurs in which the tap is switched to the extreme tap and the tap position is held, and the distribution voltage becomes high. It will be a situation that greatly deviates from the appropriate value.

In particular, many PCSs operate the AVR function when the voltage at the interconnection point of the PCS falls below or exceeds the specified voltage. Since SVR cannot know when the PCS on the load side activated the AVR function, it is often the case that a tap runaway occurs and an abnormality occurs in the distribution system without knowing it. It is increasing with.

As described above, when a power device having an AVR function is connected to the distribution line on which the SVR is installed and the power device performs constant power control according to the voltage adjustment operation of the SVR, the voltage of the SVR is adjusted. It adversely affects the operation. Therefore, the SVR grasps whether or not a power device having an AVR function is connected on the distribution line, and when the power device is connected, it is more appropriate than a normal voltage adjustment operation. It is important to perform a proper voltage adjustment operation.

The present invention has been made in view of the above problems, and is configured such that a power device having an AVR function is connected to the load side and the change in voltage at the time of voltage adjustment is canceled by the power device. It is an object of the present invention to provide a voltage regulator capable of normally determining the direction of a power supply substation even when the voltage is adjusted.

The voltage adjusting device according to the present invention has a voltage adjusting transformer having a plurality of taps, and when the voltage of the distribution line deviates from a specified voltage range, the tap position of the voltage adjusting transformer is switched to change the voltage. In a voltage regulator that automatically adjusts within the voltage range, the amount of change before and after tap switching of any one or two or more parameters of invalid power, phase, and power factor due to the tap switching operation of the voltage adjusting transformer. It is provided with a change amount detecting means for detecting and a determining means for determining whether or not a power device having a constant voltage control function is connected to the distribution line by using the detection result of the change amount detecting means. It is a voltage adjusting device characterized by.

According to the voltage adjusting device according to the present invention, the amount of change in any one or two or more parameters of the ineffective power, the phase, and the power factor changed by the tap switching of the voltage adjusting transformer is used in the distribution line. Since it is determined whether or not a power device having a constant voltage control function is connected, the voltage regulator is adversely affected by the power device, and improper tap switching is performed in the voltage adjustment operation, and eventually the tap is performed. It is possible to prevent a runaway state.

In the above voltage adjusting device, the determination means compares the detection value of the change amount detecting means with the threshold value, and if the detection value is equal to or more than the threshold value, determines that the power equipment is connected to the distribution line, and the detection value is If it is smaller than the threshold value, it may be determined that the power equipment is not connected to the distribution line.

According to the above configuration, when the amount of change before and after tap change of any one or two or more parameters of reactive power, phase, and power factor is equal to or more than the threshold value, a power device having a constant voltage control function is installed in the distribution line. Since it is determined that they are interconnected, it is possible to reliably know the interconnection of electric power devices.

Further, in the above voltage adjusting device, it is determined to determine the direction of the power supply substation which is the power supply source to the distribution line by using the amount of change before and after the tap switching of the voltage of the distribution line due to the tap switching operation of the voltage adjusting transformer. If the determination means determines that the power equipment is connected to the distribution line, the determination means does not determine the direction of the power supply substation, and the determination means connects the power equipment to the distribution line. If it is determined that there is no such value, the direction of the power supply substation should be determined.

According to the above configuration, when a power device equipped with a constant power control function is installed on the distribution line, the current substation direction information is not determined using the amount of voltage change. Therefore, it is possible to prevent tap runaway from occurring due to tap switching based on an incorrect judgment result.

Further, in the above voltage adjusting device, based on a storage means for storing the substation direction information indicating the direction in which the power supply substation exists for the voltage adjusting transformer and the substation direction information stored in the storage means. The voltage on the side where the power supply substation of the distribution line does not exist is monitored, and when the voltage deviates from the voltage range, the tap position of the voltage adjustment transformer is switched so that the voltage falls within the voltage range. The control means and the information updating means for updating the substation direction information stored in the storage means using the judgment result of the judgment means are provided. If it is determined that the voltage is set, the substation direction information stored in the storage means is not updated, and if the determination means determines that the power equipment is not connected to the distribution line, it is stored in the storage means. It is advisable to update the direction information of the substation.

According to the above configuration, when a power device having a constant power control function is installed on the distribution line, it is stored in the storage means without determining the direction of the power supply substation using the amount of voltage change. Since the existing substation direction information is maintained, it is possible to prevent inappropriate tap switching based on incorrect substation direction information, and it is possible to prevent the occurrence of tap runaway due to the chain of inappropriate tap switching.

Further, in the above voltage adjusting device, when the determining means determines that the electric power device is connected to the distribution line, the tap position correcting means for correcting the tap position of the voltage adjusting transformer to a predetermined tap position is provided. It is good.

According to the above configuration, the tap position of the voltage adjusting transformer is corrected to a predetermined tap position, so that even if improper tap switching is performed by constant voltage control of the power equipment existing in the distribution line, the voltage is changed. The tap position of the adjusting transformer can be corrected to a more appropriate tap position.

Further, in the above voltage adjusting device, the tap position correcting means may correct the tap position before switching the tap position of the voltage adjusting transformer.

According to the above configuration, the tap position of the voltage adjustment transformer is returned to the state before tap switching (the state before voltage adjustment), so that the tap is inappropriate due to the constant voltage control of the power equipment existing in the distribution line. If switching has been performed, the tap switching operation (voltage adjustment operation) can be cancelled.

Further, in the above voltage adjusting device, the tap position correcting means may correct the tap position of the voltage adjusting transformer to a predetermined tap position. For example, the tap position correcting means may correct the tap position of the voltage adjusting transformer to the tap position of the through tap.

According to the above configuration, since the tap position of the voltage adjusting transformer is fixed at a predetermined tap position (for example, the tap position of the transparent tap), the voltage adjusting transformer by controlling the constant voltage of the power equipment existing in the distribution line. It is possible to prevent an adverse effect on the tap switching operation of the vessel.

In the above voltage regulator, when the determination means determines that the power equipment is connected to the distribution line, the amount of change in voltage is calculated assuming that there is no change in the parameters detected by the change detection means. It is preferable to include a voltage change amount calculating means for determining the direction of the power supply substation using the voltage change amount calculated by the voltage change amount calculating means, and a second determining means for determining the direction of the power supply substation.

According to the above configuration, for example, the output of the ineffective power of a power device having a constant voltage control function existing in the distribution line may make the judgment of the direction of the power supply substation using the amount of change in voltage improper. In this case, the amount of change before and after tap switching of the voltage assuming that the power device is not outputting invalid power is estimated, and the direction of the power supply substation is determined using the amount of change in the voltage. It is possible to prevent an adverse effect on the judgment of the direction of the power supply substation using the amount of change in voltage due to.

Further, in the above voltage adjusting device, when the determination means determines that the power equipment is connected to the distribution line, it is preferable to include an output means for outputting the determination result. Preferably, the determination result may be output to the terminal device connected to the voltage adjusting device by wire or wirelessly.

According to the above configuration, the determination result that the electric power device having the constant voltage control function is connected to the distribution line is output to an external device such as a terminal device of the worker, so that the worker can output the determination result. It is possible to recognize whether or not the voltage adjustment operation of the voltage regulator is adversely affected by the constant voltage control of the power equipment, and if it is adversely affected, the operator can, for example, relocate the voltage regulator or the voltage of the power equipment. Measures such as stopping constant control can be taken.

The determination method relating to the interconnection of the constant voltage control device according to the present invention is the voltage of the voltage adjusting device that adjusts the voltage of the distribution line within the specified voltage range by switching the tap position of the voltage adjusting transformer having a plurality of taps. It is a judgment method regarding the existence of a constant control device, and detects the amount of change before and after tap switching of any one or two or more parameters of invalid power, phase, and power factor due to the tap switching operation of the voltage adjustment transformer. This is a determination method for determining whether or not a constant voltage control device is connected to the distribution line using the detection result.

According to the above configuration, power devices having a constant voltage control function are connected to the distribution line by using the amount of change before and after tap switching of any one or two or more parameters of reactive power, phase, and power factor. Since it is determined whether or not the system is connected, it is possible to prevent the voltage regulator from being adversely affected by the power device and being in a state of improper tap switching.

In the above method for determining the existence of a constant voltage control device, the detected value of the amount of change before and after tap change of the parameter is compared with the threshold value, and if the detected value is equal to or higher than the threshold value, the constant voltage control device is connected to the distribution line. If the detected value is smaller than the threshold value, it is preferable to determine that the voltage constant control device is not connected to the distribution line.

According to the above configuration, when the amount of change before and after tap change of any one or two or more parameters of reactive power, phase, and power factor is equal to or more than the threshold value, a power device having a constant voltage control function is installed in the distribution line. Since it is determined that they are interconnected, it is possible to reliably know the interconnection of electric power devices.

According to the voltage adjusting device or the like according to the present invention, the voltage adjusting device is adversely affected by the electric power device having the constant voltage control function, and inappropriate tap switching is performed in the voltage adjusting operation, resulting in a tap runaway state. It can be prevented from becoming.

The figure which shows the structure of the voltage adjustment apparatus which concerns on Embodiment 1. The figure which shows an example of the circuit composition of the adjustment transformer and the tap changer of the same voltage adjustment device. The figure which shows an example of the circuit structure of the voltage adjustment command circuit of the same voltage adjustment device. Block diagram showing the internal configuration of the control circuit of the voltage regulator Flow chart showing the processing procedure of the voltage adjustment operation of the control circuit of the voltage adjustment device The figure which shows the structure of the voltage adjustment apparatus which concerns on Embodiment 2. Block diagram showing the internal configuration of the control circuit of the voltage regulator Flow chart showing the processing procedure of the voltage adjustment operation of the control circuit of the voltage adjustment device A block diagram showing an internal configuration of a control circuit of a voltage regulator according to a third embodiment. Flow chart showing the processing procedure of the voltage adjustment operation of the control circuit of the voltage adjustment device The figure which shows the structure of the modification of the voltage adjustment apparatus which concerns on Embodiment 1. The figure which shows the mode of the transmission and the tidal current of the distribution system model in which SVR is installed. Diagram showing transmission and tidal modes of a distribution system model with distributed power sources installed The figure which shows an example of the amount of change of voltage by tap switching The figure which shows an example of the distribution system model which installed the electric power equipment with AVR function The figure which shows the difference between the amount of change of voltage on the primary side and the amount of change of voltage on a secondary side when a power device equipped with an AVR function performs constant voltage control and when it does not perform constant voltage control.

Hereinafter, embodiments of the voltage adjusting device according to the present invention will be described with reference to the drawings. In the following description, an example of a voltage adjusting device arranged on the distribution line and adjusting the voltage of the distribution line will be described. In the embodiment, the components with the same reference numerals perform the same operation, and thus the description may be omitted again.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a voltage adjusting device 1A according to the first embodiment, which is arranged on a three-phase distribution line. FIG. 2 is a diagram showing the configuration of the adjustment transformer 11 and the tap changer 12 of the voltage adjustment device 1A, and FIG. 3 is a primary side voltage adjustment command circuit 13A and a secondary side voltage adjustment command circuit of the voltage adjustment device 1A. It is a figure which shows the circuit structure of 13B.

There are three-phase Y-type connection and three-phase V-type connection as the connection method of the voltage adjustment circuit for adjusting the voltage of each of the U-phase, V-phase, and W-phase provided in the three-phase voltage adjustment device. The voltage adjusting device 1A shown in 1 is an example in which a voltage adjusting circuit for a three-phase Y-type connection is provided. The voltage adjustment circuit of the voltage adjustment device 1A may be a three-phase V-type connection. The voltage adjusting device 1A shown in FIG. 1 shows a portion of the voltage adjusting circuit for adjusting the voltage between the UW lines, and omits the portion of the voltage adjusting circuit for adjusting the voltage between the VW lines and the WU lines. Therefore, in the following description, voltage adjustment of the distribution line between UW lines will be described.

Voltage regulator 1A is a defined voltage v ₂ of the line L ₂ to the right than the voltage regulator 1A voltage v ₁ or distribution lines of the line L ₁ on the left than the voltage regulator 1A of distribution lines It has a voltage adjusting circuit that automatically adjusts within a voltage range, and a control unit that controls the voltage adjusting operation of the voltage adjusting circuit. The line L ₁ is connected to the primary side of the voltage adjusting transformer 11 (hereinafter referred to as “adjusting transformer 11”; see FIG. 2) in the voltage adjusting device 1A, and the line L ₂ is the adjusting transformer. because it is connected to the secondary side of the vessel 11, in the following explanation, a line L ₁ a "primary line L _1" as necessary, referred to line L ₂ as "secondary line L _2" May be explained. Further, the voltage of the primary side line L ₁ (the voltage between the U-phase line L _U and the W-phase line L _W ) and the voltage of the secondary side line L ₂ (the U-phase line L _U and the W-phase line L). _{The voltage between W} ) will be referred to as “primary side voltage v ₁ ” and “secondary side voltage v ₂ ”, respectively.

The voltage adjusting circuit of the voltage adjusting device 1A is, for example, a tap change type voltage adjusting circuit (SVR) of a complete reverse feed type. The voltage adjustment circuit includes an adjustment transformer 11, tap changers 12, 12', a primary side voltage adjustment command circuit 13A, a secondary side voltage adjustment command circuit 13B, and a voltage adjustment mode setting circuit 14.

As shown in FIG. 2, the adjusting transformer 11 is composed of an autotransformer having _{a plurality of taps t 1 to t n.} One end of the tapped winding of the adjusting transformer 11 (in FIG. 2 upper) is connected to the first tap terminal t ₁ of the tap changer 12, (lower end in FIG. 2) and the other end is connected to the neutral point N ing. In FIG. 2, the autotransformer corresponding to the W phase and the V phase of the adjusting transformer 11 is omitted. Further, since the W-phase tap changer 12'has the same configuration as the U-phase tap changer 12, a detailed description thereof will be omitted.

(N-1) taps are pulled out from a predetermined position near one end of the tapped winding, and are connected to _{the second tap terminal t 2} to the nth tap terminal t _{n of the tap changer 12, respectively.} There is. Further, the position of the r tap (however, 1 <r <n; the fourth tap in FIG. 2) of the winding with a tap is the position of the through tap, and the line on the secondary side of the U phase is at that position. L _U is connected.

Tap changer 12 includes a common terminal _{t c,} n taps terminal _t i (i is the number of taps .i = 1, 2, ... n) and the common terminal _{t c} and n taps terminal _{t i} and a contact (not shown) for connecting one of the line L _U for the primary side of the U-phase are connected to the common terminal t _c. Tap changer 12, by switching the tap terminal t _i to be connected to the common terminal t _c in a state in which load is connected, to adjust the primary voltage v ₁ or the secondary-side voltage v _2.

For the adjustment of the primary side voltage v ₁ , for example, as shown in FIGS. 12 (b) and 13 (b), a substation (power supply substation) for supplying electric power exists on the secondary side of the voltage adjusting device 1A. This is the voltage adjustment performed by the voltage adjusting device 1A. The adjustment of the secondary voltage v _2, for example, as shown in FIG. 12 (a) and FIG. 13 (a), the voltage regulator when the power supply substation is present in the primary side of the voltage regulator 1A This is the voltage adjustment performed by 1A.

Voltage regulator 1A, since the voltage to be adjusted by a power supply substation directions are different, the second secondary voltage adjusting mode to adjust the primary voltage adjusting mode to adjust the primary voltage v ₁ and the secondary-side voltage v ₂ It has various voltage adjustment modes. The power supply substation direction is the direction on the distribution line where the power supply substation exists with respect to the voltage regulator 1A. Power substation, because it is connected to either the primary side line L ₁ and the secondary side line L _2, in the present specification, the power transformer when the power supply substation is connected to the primary side line L ₁ the Tokoro direction "primary", the power substation direction when power substation is connected to the secondary side line L ₂ is referred to as "secondary side".

Voltage regulator 1A is tolerance ± Delta] v of the voltage v to be adjusted is the target voltage _{v c ([v c -Δv]} ~ [v c + Δv] voltage range. Hereinafter referred to as "target voltage range _{V AR".)} When it becomes larger than the upper limit value V _ARU (= v _c + Δv) of, the tap of the tap switchers 12 and 12'is switched in the direction in which the voltage v to be adjusted drops (lowering direction), and the voltage v becomes the upper limit value V _ARU. Adjust the voltage so that it is smaller than. Further, when the voltage v to be adjusted becomes smaller than the lower limit value V _ARD (= v _{c − Δv) of the target voltage range V AR} , the voltage adjusting device 1A adjusts the taps of the tap selectors 12 and 12 ′ to the voltage to be adjusted. The voltage is adjusted so _{that the voltage v becomes larger than the lower limit value V ARD} by switching to the direction in which v rises (boost direction).

The number of turns of the primary winding of the adjusting transformer 11 (the number of turns between the position of the tap connected to the _{common terminal t c and the neutral point N) is set to N 1,} and the number of turns of the secondary winding (of the r tap). Assuming that the number of turns between the position and the neutral point N) is N ₂ , there is a relationship of _{v 1} / v ₂ = N ₁ / N ₂ between the primary side voltage v ₁ and the secondary side voltage v _2. .. In primary voltage regulating mode, the power supply substation which is present in the secondary side line L ₂ is the variation Delta] v ₂ of the secondary side voltage v ₂ is kept small (the variation Delta] v ₂ ideally becomes substantially zero) Therefore, the primary side voltage v ₁ changes in proportion to the number of turns N _{1 by switching the taps.} On the other hand, the secondary side voltage regulation mode, becomes substantially zero variation Delta] v ₂ is the variation Delta] v ₁ of the primary-side voltage v ₁ is kept small (ideally by a power substation that is present in the primary side line L ₁ ) Therefore, the secondary voltage v ₂ changes so as to be inversely proportional to the number of turns N _{1 by switching the tap.}

Therefore, in the voltage adjusting device 1A, in the primary side voltage adjusting mode, when the primary side voltage v ₁ becomes larger than the upper limit value V _{ARU 1} (= v _c1 + Δv ₁ ) of the target voltage range V _AR1 on the primary side, the tap switch 12 performs current turns N ₁ small number of turns N ₁ primary voltage v voltage regulation ₁ is switched to the direction of the tap position (direction the tap number increases) with than tap position tap position of 12 '. Conversely, when the primary voltage _{v 1} is less than the lower limit value _V ARD1 target voltage range _{V AR1} of the primary side _{(= v c1} -Δv _1), the voltage adjusting apparatus 1A, taps of the tap changer 12, 12 ' switching position in the direction of the tap position with a large number of turns N ₁ than the number of turns N ₁ of the current tap position (direction the tap number is decreased) performs voltage regulation of the primary-side voltage v _1.

Further, in the secondary voltage adjustment mode, the voltage adjusting device 1A taps when the _{secondary side voltage v 2} becomes larger than the upper limit value V _{ARU 2} (= v _c2 + Δv ₂ ) of the target voltage range V _{AR2 on the secondary side.} the present voltage adjustment direction by switching (direction tap number is reduced) secondary voltage v ₂ of the tap position with a large number of turns N ₁ than the number of turns N ₁ tap position tap position of the vessel 12, 12 ' Do. Conversely, when the secondary-side voltage _{v 2} is smaller than the lower limit value _V Ard2 target voltage range _{V AR2} of the secondary side _{(= v c2} -Δv _2), the voltage adjusting apparatus 1A tap changer 12, 12 ' by switching the tap position in the direction of the tap position having a smaller number of turns N ₁ than the number of turns N ₁ of the current tap position (direction the tap number increases) the voltage is adjusted on the secondary side voltage v _2.

_{On the tap changers 12 and 12', either the voltage adjustment command C ta} generated by the primary side voltage adjustment command circuit 13A _{or the voltage adjustment command C tb} generated by the secondary side voltage adjustment command circuit 13B adjusts the voltage. It is input from the mode setting circuit 14. Tap changer 12, 12 'connects the tap terminals _{t i} instructed by a voltage adjustment command _{C ta} or _{C tb} input from the voltage adjusting mode setting circuit 14 to the common terminal _{t c.} That is, the tap changer 12, 12 'are switched to the indicated tap position the tap position of the adjusting transformer 11 connected to the primary side line _{L 1} with the voltage adjustment command _{C ta} or _{C tb} (tap terminal _{t i).}

Primary voltage adjustment command circuit 13A monitors the primary voltage v _1, when the primary voltage v ₁ deviates from the target voltage range V _AR1 of the primary side, accommodating the primary voltage v ₁ within the target voltage range V _AR1 The voltage adjustment command value C _ta for this is output. The voltage adjustment command value C _ta, for example, primary side when changing the voltage v ₁ to the step-down direction, tap changers 12, 12 current tap number tap position command value that changes in the direction of increasing one of the ' , and the case of changing the primary voltage v ₁ in the step-up direction, which is a command value for tapping current tap position number is changed in the direction to decrease one of the tap changer 12, 12 '. The voltage adjustment command value C _ta is input to the voltage adjustment mode setting circuit 14, and is input to the tap selectors 12 and 12'from the voltage adjustment mode setting circuit 14 when the voltage adjustment mode is set to the primary voltage adjustment mode. Will be done.

The secondary side voltage adjustment command circuit 13B _{monitors the secondary side voltage v 2} , and when the secondary side voltage v ₂ deviates from the secondary side target voltage range V _AR 2, the secondary side voltage v ₂ is set to the target voltage range. Outputs the voltage adjustment command value C _tb to be contained in V _AR2. The voltage adjustment command value C _tb is, for example, a command to change the current tap position of the tap changers 12 and 12'in the direction in which the tap number decreases by one when the _{secondary voltage v 2 is changed in the step-down direction.} a value, when changing the secondary-side voltage v ₂ in step-up direction, which is a command value for tapping current tap position number is changed in a direction to increase one of the tap changer 12, 12 '. The voltage adjustment command value C _tb is input to the voltage adjustment mode setting circuit 14, and when the voltage adjustment mode is set to the secondary voltage adjustment mode, the voltage adjustment mode setting circuit 14 is connected to the tap selectors 12 and 12'. Entered.

The primary side voltage adjustment command circuit 13A and the secondary side voltage adjustment command circuit 13B have the same circuit configuration, and have, for example, the circuit configuration shown in FIG.

The voltage adjustment command circuit 13 shown in FIG. 3 includes a voltage transformer 131, a voltage adjustment relay 132, a line voltage drop compensator 133, and a current transformer 134. The voltage adjusting relay 132 and the line voltage drop compensator 133 are connected in series with the secondary winding of the voltage transformer 131, and the output line of the current transformer 134 is connected to the voltage adjusting relay 132. Then, in the primary side voltage adjustment command circuit 13A, the primary winding of the voltage transformer 131 on the primary side _{is connected between the U-phase line L U} and the W-phase line L _{W on} the primary side, and the current transformer 134 is on the primary side. of has a structure which is attached to the line L _U of the U-phase, the secondary-side voltage regulator command circuit 13B, the line of the secondary winding of the voltage transformer 131 secondary side of the U-phase L _U and W It is connected between the phase lines L _W , and the current transformer 134 is attached to _{the U-phase line L U on the secondary side.}

The current transformer 134 has a U-phase _{line L U} and a W-phase line so that the combined current _{of the U-phase line current i U} and the W-phase line current i _{W is (i U −} i _W). It is connected to L _W. This is because when the detection current i _D of the current transformer 134 is set to the U-phase line current i _U , the phase difference of π / 6 with the applied voltage of the line voltage drop compensator 133 to which the detection current i _{D is input.} Therefore, in order to eliminate the phase difference, _{the combined current of the line current i U} and the line current i _W (the line current between the U phase and the W phase) is detected.

Voltage transformer 131, a high pressure v _{a (e.g.} several thousands [V]) to the primary winding when is applied, a low pressure corresponding to the winding ratio of the high-pressure v _a from the secondary winding v _{b (e.g.,} It is transformed into a hundred and several tens [V]) and output. Voltage transformer 131 of the primary side voltage adjustment command circuit 13A, and outputs the transformed into low v _{1 'according} a primary voltage v ₁ in the turn ratio. Moreover, instrument transformer 131 of the secondary side voltage regulator command circuit 13B and outputs transformed into a low-pressure v _{2 'corresponding} secondary-side voltage v ₂ to the winding ratio.

The voltage adjusting relay 132 is composed of, for example, 90 relays. The voltage adjustment relay 132 _{detects the voltage v b2} across the relay, generates a voltage adjustment command C _t instructing tap switching when the detected voltage v _b2 is out of the target voltage range _VAR ', and generates a voltage. Output to the adjustment mode setting circuit 14.

The line voltage drop compensator 133 (Line Drop Compensator, hereinafter referred to as “LDC 133”) is composed of a resistor and reactance that simulate the line impedance of the line to which the current transformer 134 is attached. Line voltage drop compensator 133 of the primary side voltage adjustment command circuit 13A, the primary side line of the line impedance of L ₁ is composed of a simulated resistance and reactance, secondary voltage adjustment command circuit 13B of the line voltage drop compensator 133 Is composed of a resistance simulating the line impedance of the secondary side line L _{2 and a reactance.}

Line voltage drop compensator 133 generates a voltage drop _{v b1} by line impedance by passing a sensing current _{i D} of the current transformer 134. By line voltage drop compensator 133 generates a voltage drop _{v b1,} voltage across the voltage regulating relay 132 drops the voltage _{v b} to a voltage transformer 131 detects by the voltage drop _{v b1 v} b2 = _{(v b-} v _b1 ) is applied.

Therefore, the line voltage drop compensator 133 of the _{primary side voltage adjustment command circuit 13A generates a voltage drop v 1b1} due to the line impedance of the _{primary side line v 1} , and the voltage across the voltage adjustment relay 132 of the primary side voltage adjustment command circuit 13A. is a voltage to reduce the voltage _{v 1b} of voltage transformer 131 is detected by the voltage drop _{v 1b1 v 1b2 = (v 1b} -v 1b1). Further, the line voltage drop compensator 133 of the secondary side voltage adjustment command circuit 13B _{generates a voltage drop v 2b1} due to the line impedance of the _{secondary side line v 2} , and the voltage adjustment relay 132 of the primary side voltage adjustment command circuit 13A. The voltage across the ends is a voltage v _2b2 = (v _2b −v _2b1 ) obtained _{by lowering the voltage v 2b} detected by the instrument transformer 131 by a voltage drop v _2b1.

Target voltage range _{V AR} 'of the voltage _{v b2} departing corresponds to the target voltage range _{V AR} that pressure _{v a} of line current transformer 134 is attached deviates. Voltage adjusting relay 132, high-pressure _{v a} deviates from the target voltage range _{V AR,} and generates a voltage adjustment command _{C t} for accommodating the high-voltage _{v a} target voltage range _V in _AR. Voltage v _b2 is because it is a voltage obtained by lowering the voltage v _b to a voltage transformer 131 detects by the voltage drop v _b1 by the line impedance, the change by switching the taps by the voltage adjustment command C _t outputted from the voltage adjusting relay 132 pressure v _a line to be is made as a voltage drop due to the line impedance is compensated.

Therefore, the voltage adjustment relay 132 of the primary side voltage adjustment command circuit 13A is for keeping the primary side voltage v ₁ within the target voltage range V _AR 1 on the primary side when the primary side voltage v ₁ deviates from the target voltage range V _{AR 1} . Generate the voltage adjustment command C _ta. Primary voltage v ₁ which switches the tap changing this voltage adjustment command C _ta is to voltage drop due to the line impedance of the primary side line L ₁ is compensated. The secondary-side voltage regulator command circuit 13B of the voltage adjusting relay 132, the secondary side when the voltage _{v 2} deviates from the target voltage range _{V AR2,} secondary voltage _{v 2} of the secondary side of the target voltage range _{V AR2} Generates a _{voltage adjustment command C tb} to accommodate the voltage adjustment command C tb. _{The secondary voltage v 2 that} is changed by switching the tap according to the voltage adjustment command C _tb is compensated for the voltage drop due to the line impedance of the secondary side line L _2.

The voltage adjustment mode setting circuit 14 sets the voltage adjustment mode to either the primary side voltage adjustment mode or the secondary side voltage adjustment mode based on the voltage adjustment mode _{information Cj input from the control unit.}

The voltage adjustment mode setting circuit 14 taps the _{voltage adjustment command C tb} input from the secondary side voltage adjustment command circuit 13B when the voltage adjustment mode _{information C j is the secondary side voltage adjustment mode.} Output to'. On the other hand, when the voltage adjustment mode information C _j is the primary side voltage adjustment mode, the voltage adjustment mode setting circuit 14 taps the _{voltage adjustment command C ta input from the primary side voltage adjustment command circuit 13A.} Output to'.

The voltage adjustment mode setting circuit 14 _{does not control the input of the voltage adjustment commands C ta} and C _{tb to} the tap changers 12 and 12', but when the control circuit 17 is in the primary side voltage adjustment mode, the primary side voltage. The adjustment command circuit 13A is operated to _{input the voltage adjustment command C ta} to the tap changers 12 and 12', and in the case of the secondary side voltage adjustment mode, the secondary side voltage adjustment command circuit 13B is operated to operate the voltage adjustment command C. _{You may control to input tb} to the tap changer 12, 12'.

The control unit of the voltage regulator 1A includes a primary side voltage detector 15A, a secondary side voltage detector 15B, a secondary side current detector 16, and a control circuit 17.

The primary side voltage detector 15A detects the primary side voltage v ₁ , and the secondary side voltage detector 15B detects the secondary side voltage v ₂ . The primary side voltage detector 15A and the secondary side voltage detector 15B are composed of, for example, a transformer having the same configuration as the instrument transformer 131. Primary voltage detector 15A is provided between the line L _U and W-phase line L _W of the primary side line L ₁ of the U-phase, the secondary-side voltage detector 15B is the secondary line L ₂ U It is provided between the phase line L _U and the W phase line L _W. Detection voltage v ₂ of the detected voltage v ₁ and the secondary-side voltage detector 15B of the primary-side voltage detector 15A is input to the control circuit 17.

The secondary side current detector 16 detects the secondary side current i ₂ . The secondary side current detector 16 is composed of, for example, a current transformer having the same configuration as the current transformer 134. Secondary current detector 16 is provided on the line L _U of the U-phase secondary side line L _2. The detection current i ₂ of the secondary current detector 16 is input to the control circuit 17.

The control circuit 17 controls the voltage adjustment operation of the voltage adjustment circuit. More specifically, the control circuit 17 monitors the change in the direction of the power supply substation with respect to the voltage adjustment circuit, and controls the voltage adjustment mode set in the voltage adjustment mode setting circuit 14 according to the change in the direction of the power supply substation. To do. The control circuit 17 is composed of a microcomputer including, for example, an MPU (Micro-processing unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the voltage stored in the ROM by the MPU using the RAM. By executing a predetermined program for adjustment, the automatic voltage adjustment operation of the _{primary side voltage v 1} or the secondary side voltage v _{2 by the voltage adjustment circuit is controlled.} The control circuit 17 may be realized by a PLD (Programmable Logic Device) such as FPGA (Field-Programmable Gate Array).

FIG. 4 is a block diagram showing an internal configuration of the control circuit 17.

The control circuit 17 is a processing block related to the control of the voltage adjustment mode based on the direction of the power supply substation, which includes an instantaneous voltage detection unit 171 and 173, a voltage change amount calculation unit 172, 174, a substation direction determination unit 175, and an ineffective power detection unit 176. , The invalid power change amount calculation unit 177, the determination unit 178, and the voltage adjustment mode setting unit 179 are provided. Further, the voltage adjustment mode setting unit 179 includes a substation direction storage unit 179A that stores substation direction information indicating the direction in which the power supply substation, which is a power supply source for the distribution line, exists for the adjustment transformer 11. ..

Instantaneous voltage detecting unit 171 detects the instantaneous value of the primary voltage v ₁ which is inputted from the primary voltage detector 15A, the instantaneous voltage detecting unit 173, the secondary side input from the secondary voltage detector 15B detecting the instantaneous value of the voltage v _2. The instantaneous voltage detection units 171 and 173 have the same configuration, and include, for example, a peak detection circuit, a track hold (T / H) circuit, and an A / D conversion circuit.

Assuming that the primary voltage v ₁ is V ₁ · sin (ω · t), the instantaneous voltage detection unit 171 has a peak value (analog signal) _{of V 1 · sin (ω · t) by the peak detection circuit in a predetermined period Δt.} The peak value) is detected, the peak value is held by the track hold (T / H) circuit, and the peak value is converted into a digital signal by the A / D conversion circuit and output. Therefore, the instantaneous voltage detection unit 171 detects an instantaneous value (digital value) of the _{primary side voltage v 1} = V _{1 · sin (ω · t) with a period Δt.}

Further, assuming that the secondary voltage v ₂ is V ₂ · sin (ω · t), the instantaneous voltage detection unit 173 has a period Δt, and _{the peak value (analog) of V 2} · sin (ω · t) is determined by the peak detection circuit. The peak level of the signal) is detected, the peak value is held by the track hold (T / H) circuit, and the peak value is converted into a digital signal by the A / D conversion circuit and output. Therefore, the instantaneous voltage detection unit 173 detects an instantaneous value (digital value) of the _{secondary side voltage v 2} = V _{2 · sin (ω · t) with a period Δt.}

_{The voltage change amount calculation unit 172 calculates the change amount Δv 1} of the instantaneous value of the _{primary voltage v 1} detected by the instantaneous voltage detection unit 171 in the period Δt. Voltage change amount calculation unit 172, the instantaneous value v ₁ of the primary voltage v ₁ previously detected [k-1] ((k -1) is sampled number) holds, currently detected instantaneous value of the primary voltage v ₁ The absolute value of the difference from v ₁ [k] (k is the sampling number) | v ₁ [k] −v ₁ [k-1] | is calculated as the _{amount of change Δv 1.}

_{The voltage change amount calculation unit 174 calculates the change amount Δv 2} of the instantaneous value of the _{secondary voltage v 2} detected by the instantaneous voltage detection unit 173 in the period Δt. Voltage change amount calculation unit 174, the instantaneous value v ₂ of the previously detected secondary voltage _{v 2 [k-1] (} (k-1) is sampled number) holds, the detected secondary voltage v ₂ This _{The absolute value | v 2} [k] −v ₂ [k-1] | of the difference from the instantaneous value v ₂ [k] (k is the sampling number) is calculated as the _{amount of change Δv 2.}

Substation direction judging section 175, using a variation Delta] v ₂ of the voltage change amount calculation unit 172 the amount of change in primary voltage v ₁ which is calculated Delta] v ₁ and the voltage change amount calculation unit 174 calculates the secondary-side voltage v ₂ To determine the direction of the power supply substation. As explained in the background technology, the voltage adjustment circuit performs tap switching in a state where the distribution line is not provided with a power device (hereinafter referred to as “voltage constant control device”) for controlling constant voltage such as SVC. It is known that the amount of change in voltage before and after tap switching is smaller than the amount of change in voltage on the line side where the power supply substation is located is smaller than the amount of change in voltage on the line side where the load is present. Substation direction judging section 175 makes use of this characteristic, the amount of change in the change amount of the primary voltage v ₁ before and after the tap changeover Delta] v ₁ and the secondary-side voltage v ₂ when the voltage adjustment circuit was tap switching The direction of the power supply substation is determined by comparing _{Δv 2.}

Specifically, the substation direction determination unit 175 determines that the power supply substation direction is the secondary side if _{Δv 1} > Δv _{2 , and if Δv 1} <Δv ₂ , the power supply substation direction. Is determined to be the primary side. Further, the substation direction determination unit 175 determines _{that if Δv 1} ≈ Δv ₂ , it is the same as the direction of the power supply substation determined last time. In the period in which the tap changer 12, 12 'is not performing a tap switching operation, the difference between the change amount Delta] v ₂ variation Delta] v ₁ and the secondary-side voltage v ₂ of the primary-side voltage v ₁ at the period Δt is very small Therefore, Δv ₁ ≈ Δv ₂ .

As described in the subject of the present invention, when the distribution line L is provided with a device for constant voltage control such as SVC, and the voltage adjustment circuit performs tap switching and the SVC performs constant voltage control at the same time. , The characteristic of the amount of change in voltage at the time of tap switching is different from the above characteristic, and there is a possibility that an erroneous judgment may occur. If SVC in tap changeover is estimated that the voltage is constant control, the substation direction judging section 175, variation Delta] v ₁ of the primary-side voltage v ₁ and the secondary-side voltage v ₂ of variation Delta] v ₂ Do not judge the direction of the power supply substation using.

Reactive power detector 176 detects the reactive power Q of the secondary side line L ₂ at a period Delta] t. _{The secondary side voltage v 2} detected by the secondary side voltage detector 15B _{and the secondary side current i 2} detected by the secondary side current detector 16 are input to the ineffective power detection unit 176. The invalid power detection unit 176 has, for example, _{an A / D conversion circuit that converts a secondary voltage v 2} (analog signal) into a digital signal, and an A / D that converts a secondary current i ₂ (analog signal) into a digital signal. It is configured to include a D conversion circuit, an integrating circuit that integrates the _{secondary side voltage v 2} (digital value), and a multiplication circuit that multiplies _{the integrated value of the secondary side voltage v 2} and the secondary side current i _2. .. In this configuration, the reactive power detection unit 176 calculates the reactive power Q by _{delaying the phase of the secondary voltage v 2} by π / 2 in the integrating circuit _{and then multiplying it by the secondary current i 2.}

Reactive power Q are, for example, three-phase voltage signal _v uv secondary _side, v _{vw, v} two-phase voltage signals _V a mutually orthogonal to _wu, converted to _{V b,} the three-phase current signals _{i u} of the secondary side , I _v , i _w can also be calculated by converting them into _{two-phase current signals I a} , I _b that are orthogonal to each other, and performing _{arithmetic processing of (-V a} , I _b + V _b , I _a).

The reactive power detection unit 176, for example, a first three-phase / two-phase conversion circuit for converting three-phase voltage signal _v uv secondary _side, v _{vw, v wu} biphasic voltage signal _V a, the _{V b,} Two are the first filter circuit that removes harmonics from the output of the first three-phase / two-phase conversion circuit to extract the fundamental wave component, and the two-phase three-phase current signals i _u , _iv , and i _w on the secondary side. A second three-phase / two-phase conversion circuit that converts to phase current signals I _a and I _b , and a second that removes harmonics from the output of the second three-phase / two-phase conversion circuit to extract the fundamental wave component. It is composed of the filter circuit of the above and the output of the invalid power calculation circuit, and is used as the output of the first filter circuit (V _a , V _b ) and the output of the second filter circuit (I _a , I _b ) in the invalid power calculation circuit. The invalid power Q may be detected by performing the arithmetic processing of (−V _a , I _b + V _b , I _a).

The ineffective power change amount calculation unit 177 calculates the change amount ΔQ of the ineffective power Q detected by the ineffective power detection unit 176 in the period Δt. Reactive power variation amount calculating portion 177, the reactive power Q of the previously detected secondary line _{L 2 [k-1] (} (k-1) is sampled number) holding the reactive power Q [k detected this time ] (K is the sampling number) | Q [k] −Q [k-1] | is calculated as the amount of change ΔQ.

The determination unit 178 determines whether or not a power device (constant voltage control device) having a constant voltage control function such as an SVC, a PCS, or a synchronous generator is connected to the distribution line. Determination unit 178 compares the threshold value Q _TH which is previously set change amount ΔQ of the reactive power Q outputted from the reactive power variation amount calculating unit 177, the determination result based on the comparison result to the substation direction judging section 175 Output. For example, _{if ΔQ> Q TH} , the determination unit 178 outputs an invalid power Q for constant voltage control from the constant voltage control device installed on the secondary side line L _{2, that is, the distribution line.} It is determined that the constant voltage control device is connected to. _{Further, if ΔQ ≦ Q TH} , the determination unit 178 does not output the invalid power Q from the voltage constant control device to the secondary side line L ₂ , that is, the voltage constant control device is connected to the distribution line. Judge that there is no.

If the voltage constant control device outputs the invalid power Q at the time of tap switching, the substation direction determination unit 175 may not be able to determine the proper power supply substation direction. Therefore, the determination unit 178 determines the substation direction. also said to determine the suitability of the determination using a variation Delta] v ₂ variation Delta] v ₁ of by the determination unit 175 primary voltage v ₁ and the secondary-side voltage v ₂ power substations direction. The determination unit 178 outputs the determination result to the substation direction determination unit 175.

As described above, the substation direction determination unit 175 determines from the determination unit 178 that "the voltage constant control device does not have constant voltage control" (the determination result of the power supply substation direction of the substation direction determination unit 175 is appropriate). is input, perform power substation direction determination using a variation Delta] v ₂ variation Delta] v ₁ of the primary-side voltage v ₁ and the secondary-side voltage v _2. On the other hand, the substation direction determination unit 175 inputs the determination result of "the voltage constant control of the constant voltage control device is present" (the determination result of the power supply substation direction of the substation direction determination unit 175 is inappropriate) from the determination unit 178. that when, not power substation direction determination using a variation Delta] v ₂ variation Delta] v ₁ of the primary-side voltage v ₁ and the secondary-side voltage v _2.

The voltage adjustment mode setting unit 179 updates the substation direction information stored in the substation direction storage unit 179A based on the determination result input from the substation direction determination unit 175, and the voltage adjustment mode setting circuit 14 Controls the setting of the voltage adjustment mode to. The substation direction storage unit 179A, as default values in the substation direction information, e.g., information indicating that the power supply substation is present in the secondary side line L ₂ ( "Power Substation direction the secondary side" Information) is stored.

The voltage adjustment mode setting unit 179 updates the substation direction information stored in the substation direction storage unit 179A using the determination result input from the substation direction determination unit 175. When the judgment result input from the substation direction determination unit 175 is "the power supply substation direction is the primary side", the information of "the power supply substation direction is the secondary side" stored in the substation direction storage unit 179A is The information is updated to "Power supply substation direction is primary side". When the determination result input from the substation direction determination unit 175 is "the power supply substation direction is the secondary side", the stored contents do not substantially change even if the information in the substation direction storage unit 179A is updated. In this case, the information update process of the substation direction storage unit 179A may not be performed.

The voltage adjustment mode setting unit 179 sets the voltage adjustment mode in the voltage adjustment mode setting circuit 14 based on the substation direction information stored in the substation direction storage unit 179A. For example, when the information "the direction of the power supply substation is the primary side" is stored in the substation direction storage unit 179A, the voltage adjustment mode setting unit 179 sets the secondary voltage adjustment mode in the voltage adjustment mode setting circuit 14. .. Further, when the information "the direction of the power supply substation is the secondary side" is stored in the substation direction storage unit 179A, the voltage adjustment mode setting unit 179 sets the primary voltage adjustment mode in the voltage adjustment mode setting circuit 14. ..

Next, the operation of the voltage adjusting device 1A will be described with reference to the flowchart shown in FIG.

In the following description, the power supply substation exists on the primary side, and the information of "the power supply substation direction is the primary side" is stored in the substation direction storage unit 179A of the voltage regulator 1A as the default value of the substation direction information. It is assumed that Then, the voltage adjusting apparatus 1A, at the start of operation is in voltage regulation mode setting circuit 14 secondary voltage adjusting mode is set, the secondary-side voltage regulator command circuit 13B monitors the secondary voltage v _2, the secondary voltage When v ₂ deviates from the target voltage range V _AR2 on the secondary side, the tap selectors 12 and 12'are to switch taps by the _{voltage adjustment command C tb} output from the secondary side voltage adjustment command circuit 13B. To do.

(Step S101) The instantaneous value detection unit 171 and the voltage change amount calculation unit 172 calculate the change amount Δv ₁ of _{the primary side voltage v 1.} Further, the instantaneous value detection unit 173 and the voltage change amount calculation unit 174 calculate the change amount Δv ₂ of _{the secondary side voltage v 2.}

(Step S102) reactive power detection unit 176 and the reactive power variation amount calculating portion 177 calculates the amount of change ΔQ of the reactive power Q of the secondary side line _{L 2.}

(Step S103) Whether or not the substation direction determination unit 175 and the determination unit 178 output the voltage adjustment command C _{ta from the primary side voltage adjustment command circuit 13A or the voltage adjustment command C tb} from the secondary side voltage adjustment command circuit 13B. That is, it is determined whether or not the taps of the tap changers 12 and 12'have been switched. If the taps of the tap changers 12 and 12'are not switched (S103: N), the substation direction determination unit 175 does not perform the determination process of the power supply substation direction, and the determination unit 178 controls the constant voltage. The process returns to step S101 without determining the presence / absence of constant voltage control by the device. If the taps of the tap changers 12 and 12'are switched (S103: Y), the process proceeds to step S104.

If the taps of the tap changers 12 and 12'are not switched, the voltage adjustment mode setting unit 179 does not output the determination result of the power supply substation direction to the voltage adjustment mode setting unit 179. Therefore, the voltage adjustment mode setting unit 179 is currently used. The voltage adjustment mode of (substation direction storage unit 179A is not changed) is maintained. When the voltage adjustment operation is started, the voltage adjustment device 1A is operating in the secondary side voltage adjustment mode, so that the operation of the secondary side voltage adjustment mode is maintained.

(Step S104) The determination unit 178 compares the change amount ΔQ of the invalid power Q calculated by the invalid power change amount calculation unit 177 with the threshold value Q _TH , and outputs the determination result based on the comparison result to the substation direction determination unit 175. To do. If ΔQ> Q _TH (S104: Y), the determination unit 178 outputs the determination result with constant voltage control to the substation direction determination unit 175, and returns to the process of step S101. The substation direction determination unit 175 does not perform the determination process of the power supply substation direction based on the determination result with constant voltage control.

On the other hand, _{if ΔQ ≦ Q TH} (S104: N), the determination unit 178 outputs the determination result without constant voltage control to the substation direction determination unit 175, and proceeds to the process of step S105.

(Step S105) substations direction judging section 175, a change amount Delta] v ₁ of the voltage change amount calculation unit 172 to calculate primary voltage _{v 1,} the change of the voltage change amount calculation unit 174 to calculate the secondary-side voltage _{v 2} Determine if it is greater than the quantity Δv _{2. If Δv 1} > Δv ₂ (S105: Y), the substation direction determination unit 175 proceeds to the process of step S106, _{and if Δv 1} ≤ Δv ₂ (S105: N), proceeds to the process of step S108.

(Step S106) substations direction judging section 175 judges that the power supply substation is present in the secondary side line L _2, "Power Substation direction the secondary side" outputs the determination result of the voltage adjusting mode setting unit 179 To do.

(Step S107) The voltage adjustment mode setting unit 179 inputs the substation direction information stored in the substation direction storage unit 179A from the substation direction determination unit 175 to determine the power supply substation direction (power supply substation direction). Is updated on the secondary side), the primary side voltage adjustment mode is set in the voltage adjustment mode setting circuit 14 based on the updated substation direction information, and the process returns to step S101.

(Step S108) substations direction judging section 175 judges whether the change amount Delta] v ₂ of the secondary side voltage _{v 2} is greater than the amount of change Delta] v ₁ of the primary-side voltage _{v 1. If Δv 2} > Δv ₁ (S108: Y), the substation direction determination unit 175 proceeds to the process of step S109, _{and if Δv 1} = Δv ₂ (S108: N), returns to the process of step S101.

(Step S109) substations direction judging section 175, the power supply substation is determined to exist on the primary side line L _1, "the power substation direction the primary side" and outputs the result of determination of the voltage adjusting mode setting unit 179.

(Step S110) The voltage adjustment mode setting unit 179 inputs the substation direction information stored in the substation direction storage unit 179A from the substation direction determination unit 175 to determine the power supply substation direction (power supply substation direction). Is updated on the primary side), the secondary side voltage adjustment mode is set in the voltage adjustment mode setting circuit 14 based on the updated substation direction information, and the process returns to step S101.

In the flowchart of FIG. 5, the process ends when the power is turned off or an interrupt for the end of the process occurs.

When the distribution system in which the voltage regulator 1A is installed distributes power in the forward power transmission-forward power flow mode shown in FIG. 12 (a) or the forward power transmission-reverse power flow mode shown in FIG. 13 (a), the power substation Since it is the substation DS ₁ existing on the line PL ₁ on the primary side, the voltage regulator 1A holds the correct substation direction information that "the direction of the power transmission substation is the primary side".

Thus, voltage regulator 1A monitors the secondary voltage v ₂ on the basis of the substation direction information, the secondary-side voltage v ₂ deviates from the target voltage range V _AR2 of the secondary side, tap changer 12, By switching the tap of 12', the voltage adjustment operation is performed so that the _{secondary side voltage v 2} falls within the secondary side target voltage range V _{AR 2.} Then, the voltage regulator 1A calculates the amount of change Δv ₁ and Δv _{2 of the primary side voltage v 1} and the secondary side voltage v ₂ before and after the tap changer every time the tap changers 12 and 12'perform the tap changer operation. Then, the direction of the power supply substation is determined using both change amounts Δv ₁ and Δv _2. In this determination process, whether or not the direction of the power supply substation has changed, that is, whether or not the distribution system has, for example, the reverse power transmission-reverse power flow mode shown in FIG. 12 (b) or the reverse power transmission-order shown in FIG. 13 (b). It corresponds to the confirmation process of whether or not the mode has changed to the tidal current mode.

To confirm the change in the power supply substation direction during tap switching is the period when the tap switching is not carried out the difference of the primary side voltage v ₁ of the variation Delta] v ₁ and the secondary-side voltage v ₂ of variation Delta] v ₂ minute the case, if the tap switching is performed, the amount of change in the side primary voltage v ₁ of the variation Delta] v ₁ and the secondary-side voltage v ₂ of variation Delta] v ₂ in the power substation is present before and after the increase (See FIG. 14), and this phenomenon is used to determine the direction of the power supply substation.

When a constant voltage control device such as SVR is not installed in the distribution system and the distribution system is in the forward power transmission-forward power flow mode or the forward power transmission-reverse power flow mode, the voltage regulator 1A says "The power supply substation direction is the primary side. If repeated tap switching operation of automatically adjusting to based on the information that the "secondary-side voltage _{v 2} and the target voltage range _{V AR2} of the secondary side, in the flowchart of FIG. 5, step S101 to S105, S108 to S110, The loop processing of S101 is repeated. In this loop processing, the voltage adjusting device 1A determines the direction of the power supply substation for each tap switching, and acquires the same information as the substation direction information held at the time of tap switching. Since the voltage adjusting device 1A acquires the correct substation direction information every time the tap is switched, the normal voltage adjusting operation is repeated.

On the other hand, the distribution system switches from the forward power transmission-forward power flow mode or the forward power transmission-reverse power flow mode to the reverse power transmission-forward power flow mode shown in FIG. 12 (b) or the reverse power transmission-reverse power flow mode shown in FIG. 13 (b). If this happens, the direction of the power supply substation changes from the primary side to the secondary side, but since the voltage regulator 1A holds the information that "the direction of the power supply substation is the primary side", the power transmission-tide mode is set. also monitors the secondary voltage v ₂ after it has been switched. _{Then, when the secondary side voltage v 2} deviates from the target voltage range V _AR 2 on the secondary side, the voltage regulator 1A switches the taps of the tap selectors 12 and 12'and the secondary side voltage v ₂ becomes the secondary side. The voltage adjustment operation is performed so as to fall within the target voltage range _{VAR2 of.}

In the judgment of the power substation direction in the first tap switching after the transmission-tide mode is switched, the power substation is switched to the substation DS _{2 existing on the secondary side line PL 2} , so tap. variation Delta] v ₁ of switching back and forth of the primary voltage v _1, as shown in FIG. 14 (b), is larger than the variation Delta] v ₂ of the secondary side voltage v _2. Therefore, in the flowchart shown in FIG. 5, the loop processing of steps S101 to S107 and S101 is performed. By this loop processing, the voltage regulator 1A correctly determines that "the direction of the power supply substation is the secondary side", and stores the information of "the direction of the power supply substation is the primary side" stored in the substation direction storage unit 179A. The content of "the direction of the power supply substation is the secondary side" is changed, and the voltage adjustment mode setting circuit 14 is switched to the primary side voltage adjustment mode.

Thus, voltage regulator 1A is then "Power Substation direction secondary" monitors the primary voltage v ₁ based on information, departing from the target voltage range V _AR1 of primary voltage v ₁ is the primary Then, the taps of the tap changers 12 and 12'are switched, and the voltage adjustment operation is performed so that the _{primary side voltage v 1} falls within the target voltage range V _{AR 1 on the primary side.}

As described above, if the constant voltage control device is not installed in the distribution system and the constant voltage control device does not perform the constant power control operation in response to the voltage adjustment operation of the voltage regulator 1A, the power transmission of the distribution system- Even if the correct voltage adjustment operation may not be performed in the tap switching immediately after the power flow mode is switched, the voltage adjusting device 1A can confirm the correct power supply substation direction at the time of the tap switching. Therefore, after that, the voltage adjusting device 1A can perform an appropriate voltage adjusting operation based on the correct substation direction information.

Next, for example, in the distribution system of the forward power transmission-forward power flow mode shown in FIG. 12A, for example, as shown in FIG. 15, an SVC having an AVR function is installed _{on the distribution line PL 2 on the secondary side.} When the configuration is changed, the voltage regulator 1A operates as follows.

When the voltage regulator 1A is a tap switching for automatically adjusting the secondary-side voltage v ₂ within the target voltage range V _AR2 on the secondary side on the basis of the information of the "power substation direction the primary side", the tap changeover As a result, the secondary side voltage v ₂ changes by the amount of voltage change corresponding to the tap switching of the adjusting transformer 11. For example, if the tap switching is one tap and the amount of voltage change due to the tap switching is 100 [V], the secondary voltage v ₂ changes by about 100 [V]. When the secondary side voltage v ₂ changes, the SVC installed on the distribution line PL ₂ instantaneously outputs the invalid power Q to cancel the change in the _{secondary side voltage v 2.} That is, when the secondary side voltage v ₂ changes to increase by 100 [V], the SVC immediately _{operates so as to decrease the secondary side voltage v 2} by 100 [V], and the secondary side voltage v ₂ increases by 100 [V]. ] When the change to descending, SVC is operative to immediately secondary voltage _{v 2} 100 [V] is raised.

Voltage regulator 1A has detected variation ΔQ of the reactive power Q of the secondary line L ₂ back and forth tap switching, if the SVC has a constant voltage control and output reactive power Q, a relatively large The amount of change ΔQ is detected. Voltage regulator 1A compares with a predetermined threshold value Q _TH a variation Delta] Q of the reactive power Q detected, Delta] Q> if Q _TH, the installed SVC voltage constant control on the secondary side line L ₂ Judge that you did. When the SVC controls the voltage to be constant, the amount of voltage change corresponding to tap switching changes _{both voltages v 1} and v ₂ in a form of being distributed to the _{primary side voltage v 1} and the secondary side voltage v _2. Therefore, FIG. As shown in (b), _{both the amount of change | Δv 1} | and the amount of change | Δv ₂ | become large. For example, in the above example, 1 voltage taps variation 100 [V], for example, the variation of the primary voltage _{v 1 Δv 1 ≒ -50 [V} ] and the secondary-side voltage _{v 2} of variation Delta] v ₂ It appears as ≈ +50 [V]. Therefore, it cannot be said that the determination of the direction of the power supply substation using the _{amount of change Δv 1} and the amount of change Δv _{2 is appropriate.}

Thus, the forward power transmission - in the distribution system of the forward power flow mode, if the SVC installed on the secondary side line _{L 2} has the voltage constant control, in the flowchart shown in FIG. 5, step S101-S104, the loop process of the S101 Will be done. This loop includes a voltage adjusting apparatus 1A does not perform the power substation direction determination using a variation Delta] v ₂ variation Delta] v ₁ of the primary-side voltage v ₁ and the primary-side voltage v _2, the substation direction storage The substation direction information stored in the unit 179A is held in the state before tap switching, and the voltage adjustment mode set in the voltage adjustment mode setting unit 179 is also held in the secondary voltage adjustment mode.

In the reverse power transmission-forward power flow mode distribution system shown in FIG. 12 (b) or FIG. 13 (b), an _{SVC is installed on the line PL 1} on the primary side, and the voltage regulator 1A is the voltage of the primary side voltage v ₁ . Even when the SVC controls the voltage to be constant during the adjustment operation, the voltage adjustment device 1A performs the same processing. That is, the voltage regulating apparatus 1A, in the flowchart shown in FIG. 5, step S101-S104, perform the loop process of S101, the variation of the primary voltage _{v 1} before and after the tap changeover Delta] v ₁ and the amount of change in the primary voltage _{v 2} The direction of the power supply substation is not determined using _{Δv 2.} Therefore, the substation direction information stored in the substation direction storage unit 179A of the voltage adjustment device 1A is retained in the state before tap switching, and the voltage adjustment mode set in the voltage adjustment mode setting unit 179 is also the primary side voltage. It is held in the adjustment mode.

As described above, in the voltage adjusting device 1A according to the first embodiment, a constant voltage control device such as an SVC is installed on the line on the side where the voltage adjusting device 1A adjusts the voltage based on the substation direction information, and the voltage adjusting device 1A If the voltage constant control apparatus when a tap switching operation is estimated to have a constant voltage control, use the primary voltage v ₁ of the variation Delta] v ₁ and variation Delta] v ₂ of the secondary side voltage v ₂ The current substation direction information is maintained without determining (or confirming) the direction of the power supply substation. Thus, according to the first embodiment, avoiding the possibility of erroneous determination in the power substation direction determination using a variation Delta] v ₂ variation Delta] v ₁ of the primary-side voltage v ₁ and the secondary-side voltage v ₂ can do.

For example, in the determination of the power supply substation direction at the time of tap switching in the forward power transmission-forward power flow mode or the forward power transmission-reverse power flow mode, the voltage regulator 1A mistakes the power supply substation direction and stores it in the substation direction storage unit 179A. changing the substation direction information are in "power substation direction the secondary side" voltage regulator 1A is then made to perform the voltage adjustment of the primary voltage v ₁ at the primary side voltage regulation mode. Since the power supply substation is present in the primary side line L _1, the voltage regulation device 1A made to perform the tap switching by the voltage adjustment command C _ta from the primary side voltage regulator command circuit 13A, the primary side every time performing a tap switching voltage v ₁ is changed in a direction which deviates from the target voltage range V _AR1 of the primary side, the tap tap position of the limit of the switching unit 12, 12 '(FIG. 2, the first tap or lower end of the upper end of the autotransformer first After repeating tap switching until (n tap), a state of holding the tap position (a state of tap runaway) occurs.

In the voltage adjusting device 1A according to the first embodiment, in determining the direction of the power supply substation for each tap switching, it is possible to avoid erroneous determination of the direction of the power supply substation, so that the above-mentioned tap runaway can be prevented.

(Embodiment 2)
FIG. 6 is a diagram showing a configuration of the voltage adjusting device 1B according to the second embodiment.

When it is estimated that the constant voltage control device such as SVC installed on the line on the side where the voltage is adjusted when the tap is switched, the voltage adjustment device 1B according to the second embodiment further controls the constant voltage. The tap positions of the tap changers 12 and 12'are switched to a predetermined tap position. The voltage adjusting device 1A according to the first embodiment maintains the result of the tap switching operation already performed until the next tap switching operation, while the voltage adjusting device 1B according to the second embodiment maintains the result of the tap switching operation already performed. It differs from the voltage adjusting device 1A in that the tap position of the tap switching devices 12 and 12'is switched to a predetermined tap position so as to cancel the operation.

In the second embodiment, when it is estimated that the constant voltage control device such as SVC has controlled the constant voltage, the tap switching operation performed immediately before that is performed under the correct recognition of the direction of the power supply substation. Since it is doubtful that the tap position is improperly switched based on the misrecognition of the direction of the power supply substation, the tap position switched by the automatic voltage adjustment is corrected to a predetermined tap position.

Voltage regulator 1B shown in FIG. 6, the point that the voltage regulator 1A shown in FIG. 1, is a configuration for inputting a tap changeover signal C _S to 'tap changer 12, 12 from the' control circuit 17 different. Adjustment transformer 11, tap changer 12, 12'shown in FIG. 7, primary side voltage adjustment command circuit 13A, secondary side voltage adjustment command circuit 13B, voltage adjustment mode setting circuit 14, primary side voltage detector 15A, secondary Since the functions and configurations of the side voltage detector 15B and the secondary side current detector 16 are the same as those described in the description of the voltage regulator 1A, the description thereof will be omitted.

FIG. 7 is a block diagram showing an internal configuration of the control circuit 17'of the voltage adjusting device 1B according to the second embodiment.

The block diagram of the control circuit 17'shown in FIG. 7 is a block diagram of the control circuit 17 shown in FIG. 4 with the tap position correction unit 180 added. The functions and configurations of the instantaneous value detection unit 171 and 173, the voltage change amount calculation unit 172, 174, the invalid power detection unit 176, the invalid power change amount calculation unit 177, and the voltage adjustment mode setting unit 179 will be described in the description of the control circuit 17. Since the contents are the same as those described above, the description thereof will be omitted, and the functions and configurations of the substation direction determination unit 175, the determination unit 178, and the tap position correction unit 180 will be described.

The determination unit 178 compares the change amount ΔQ of the invalid power Q output from the invalid power change amount calculation unit 177 with the preset threshold value Q _TH, and determines the determination result based on the comparison result with the substation direction determination unit 175. Output to the tap position correction unit 180. For example, _{if ΔQ> Q TH} , the determination unit 178 outputs an invalid power Q for constant voltage control from the constant voltage control device installed on the secondary side line L _{2, that is, the distribution line.} It is determined that the constant voltage control device is connected to. _{Further, if ΔQ ≦ Q TH} , the determination unit 178 does not output the invalid power Q from the voltage constant control device to the secondary side line L ₂ , that is, the voltage constant control device is connected to the distribution line. Judge that there is no. The determination unit 178 outputs the determination result to the substation direction determination unit 175 and the tap position correction unit 180.

Substation direction determining unit 175, the determination unit 178 when the "voltage constant control voltage constant control without the device" determination result is input, the amount of change Delta] v ₁ and the secondary-side voltage v ₂ primary voltage v ₁ The direction of the power supply substation is determined using the amount of change Δv _2. On the other hand, the substation direction determination unit 175 does not determine the direction of the power supply substation when the determination result of "the voltage constant control device has constant voltage control" is input from the determination unit 178.

Tap position correcting unit 180, if the decision result in the "constant voltage control without voltage constant control device" is input from the determination unit 178 does not perform the output of the correction command signal C _s to tap changer 12, 12 ' .. On the other hand, when the determination result of "the voltage constant control of the constant voltage control device is present" is input from the determination unit 178, the tap position correction unit 180 corrects the tap position to the predetermined tap position in the tap changers 12 and 12'. Outputs the correction command signal C _s.

The predetermined tap position is, for example, a tap position before tap switching or a predetermined tap position. The tap position before tap change is, for example, the current tap position (for example, the s) _{according to the voltage adjustment command C ta} or the voltage adjustment command C _tb output from the voltage adjustment mode setting circuit 14 by the tap changers 12 and 12'. When the tap position is switched from the tap position to the adjacent tap position (the (s + 1) tap or the (s-1) tap), it is the position of the s tap. The process of correcting the tap position switched by tap switching to the tap position before switching corresponds to the process of returning to a state in which tap switching is not substantially performed.

The predetermined tap position is, for example, the position of the through tap (the position of the fourth tap in the examples of FIGS. 1 and 5). The position of the through tap is a position where the ratio of the primary winding to the secondary winding of the adjusting transformer 11 is "1".

When the tap position correction unit 180 corrects the tap position of the tap changers 12 and 12'to the tap position before the tap change, the tap position correction unit 180 performs the tap change operation performed by the _{voltage adjustment command C ta} or the voltage adjustment command C _tb. outputs a correction command signal C _s to instruct to switch the tap position in the opposite direction to the tap changer 12, 12 '. Also, the tap position correcting unit 180, when modifying the tap changer 12, 12 'to the predetermined tap position correction command signal including a tap number indicating a predetermined tap position C _{s (for} example, in the case of plain tap, A correction command signal (a correction command signal instructing correction of the tap position including the tap number “4”) is output to the tap selectors 12 and 12'.

FIG. 8 is a flowchart showing a processing procedure of the voltage adjusting operation of the voltage adjusting device 1B.

Flowchart shown in FIG. 8, in the flowchart shown in FIG. 5, when the change amount ΔQ of the reactive power Q at the step S104 is larger than the threshold value _{Q TH} (S104: Y), was added to the process of step S111 in the way back to the step S101 It is a thing. Processing in step S111, the tap position or predetermined before tapping switches the tap position of the 'outputs a correction command signal C _s tap changer 12, 12' tap position correcting unit 180 is a tap changer 12, 12 It is a process to correct the tap position.

Since the content of each process of steps S101 to S110 is the same as the content of the operation description of the voltage adjusting device 1A using the flowchart of FIG. 5, the description of the process of each step is omitted, and the description of the process of each step is omitted below. The outline of the operation of is explained.

Voltage regulator 1B when the distribution system in which the voltage regulator 1B is installed supplies power in the forward power transmission-forward power flow mode shown in FIG. 12 (a) or the forward power transmission-reverse power flow mode shown in FIG. 13 (a). The voltage adjusting operation of the above is the same as the voltage adjusting operation of the voltage adjusting device 1A described above. Further, the distribution system is switched from the forward power transmission-forward power flow mode or the forward power transmission-reverse power flow mode to the reverse power transmission-forward power flow mode shown in FIG. 12 (b) or the reverse power transmission-reverse power flow mode shown in FIG. 13 (b). The voltage adjusting operation of the voltage adjusting device 1B when the voltage is adjusted is the same as the voltage adjusting operation when the power transmission-power flow mode of the voltage adjusting device 1A described above is switched.

Next, for example, in the distribution system of the forward power transmission-forward power flow mode shown in FIG. 12A, for example, as shown in FIG. 15, an SVC having an AVR function is installed _{on the distribution line PL 2 on the secondary side.} When the configuration is changed, the voltage regulator 1B operates as follows.

When the voltage regulator 1B has a tap switching for automatically adjusting the secondary-side voltage v ₂ within the target voltage range V _AR2 on the secondary side on the basis of the information of the "power substation direction the primary side", the tap changeover In response to the change in the secondary side voltage v _{2 due to the above, the SVC installed in the distribution line PL 2} instantaneously outputs the invalid power Q to cancel the change in the _{secondary side voltage v 2.}

Voltage regulator 1B detects the amount of change ΔQ of the reactive power Q of the secondary side line L ₂ by tap switching is compared with a threshold value Q _TH that is determined and the amount of change ΔQ in advance. Then, the voltage adjusting device 1B, Delta] Q> if Q _TH, determines that the SVC installed on the secondary side line L ₂ has a constant voltage control. When the SVC controls the voltage to be constant, as described above, the voltage change amount corresponding to the tap switching _{is distributed to the primary side voltage v 1} and the secondary side voltage v ₂ , and both voltages v ₁ and v ₂ are changed. Therefore, it cannot be said that the determination of the direction of the power supply substation using the _{amount of change Δv 1} and the amount of change Δv _{2 is appropriate.}

Thus, the forward power transmission - in the distribution system of the forward power flow mode, if the SVC installed on the secondary side line _{L 2} has the voltage constant control, in the flowchart shown in FIG. 8, step S101-S104, S 111, S101 of Loop processing is performed. In this loop process, the voltage adjusting apparatus 1B does not perform the power substation direction determination using a variation Delta] v ₂ variation Delta] v ₁ of the primary-side voltage v ₁ and the secondary-side voltage v _2, the substation direction The substation direction information stored in the storage unit 179A is held in the state before tap switching, and the voltage adjustment mode set in the voltage adjustment mode setting unit 179 is also held in the secondary voltage adjustment mode. .. Further, the voltage adjusting device 1B corrects the tap position of the tap changers 12 and 12'to a predetermined tap position such as a tap position before tap change or a predetermined tap position.

In the reverse power transmission-forward power flow mode distribution system shown in FIG. 12 (b) or FIG. 13 (b), an _{SVC is installed on the line PL 1} on the primary side, and the voltage regulator 1 B is the voltage of the primary side voltage v ₁ . Even when the SVC controls the voltage to be constant during the adjustment operation, the voltage adjustment device 1B performs the same processing. That is, the voltage regulating apparatus 1B, in the flowchart shown in FIG. 8, step S101-S104, S 111, S101 of loops through, the tap switching of the primary side voltage _{v 1} variation Delta] v ₁ and the secondary-side voltage _{v 2} The direction of the power supply substation is not determined using the amount of change Δv _2. Therefore, the substation direction information stored in the substation direction storage unit 179A of the voltage adjustment device 1B is retained in the state before tap switching, and the voltage adjustment mode set in the voltage adjustment mode setting unit 179 is also the primary side voltage. It is held in the adjustment mode.

Further, the voltage adjusting device 1B corrects the tap position of the tap changers 12 and 12'to a predetermined tap position such as a tap position before tap change or a predetermined tap position.

As described above, in the voltage adjusting device 1B according to the second embodiment, when it is estimated that the voltage constant control device performs the voltage constant control when the voltage adjusting device 1B performs the tap switching operation, the primary side voltage v ₁ without variation Delta] v ₁ and the secondary-side voltage v ₂ of variation Delta] v ₂ power substations direction determination using the (or check), since in order to maintain the current substation direction information, primary it is possible to avoid the risk of an erroneous determination in the power substation direction determination using a variation Delta] v ₂ of the variation Delta] v ₁ and the secondary-side voltage v ₂ side voltage v _1.

Further, also in the second embodiment, in the determination of the power supply substation direction for each tap switching, the erroneous determination of the power supply substation direction can be avoided, so that the above-mentioned tap runaway can be prevented.

Further, in the second embodiment, in the determination process after tap switching, the voltage adjusting device 1B connects the voltage constant control device to the distribution line, and the voltage constant control device sets the invalid power Q for the voltage constant control. When it is determined that the output is being performed, the tap position of the tap switchers 12 and 12'is corrected to the tap position before switching or a predetermined tap position (for example, the position of the through tap), so that the operation was performed immediately before. If the tap switching operation is inappropriate tap switching based on erroneous recognition of the direction of the power supply substation, it can be corrected to a more appropriate tap position than the tap switching.

If improper tap switching based on misrecognition of the direction of the power supply substation is left unattended, for example, each tap will switch to an inappropriate direction for each judgment, resulting in the above-mentioned tap runaway or a direction other than the voltage direction that should be adjusted originally. There is a risk that the voltage will be changed to the voltage of 1 and the voltage _{will deviate from the target voltage range VAR} , but according to the second embodiment, the tap position is corrected to the tap position before tap switching or the position of the through tap. By doing so, the occurrence of the defect can be reduced.

(Embodiment 3)
In the voltage adjusting device 1C according to the third embodiment, when the tap is switched, the constant voltage control device such as SVC installed on the line on the side where the voltage is adjusted outputs the invalid power Q to perform the constant voltage control. If the estimated estimates the primary voltage v ₁ of the variation Delta] v 1 when the voltage constant voltage control by the fixing control device was assumed there was no _'variation of the secondary voltage v ₂ Delta] v _2', both variation Delta] v ₁ is obtained so as to determine the power substation direction using a ', Δv _2' (estimated value).

The configuration of the voltage regulator 1C according to the third embodiment is the same as the configuration of the voltage regulator 1B shown in FIG. 6, and the block configuration of the control circuit 17 "is different. Therefore, the control circuit 17" of the voltage regulator 1C is different. The description of the configurations other than the above will be omitted.

FIG. 9 is a block diagram showing an internal configuration of the control circuit 17 "of the voltage adjusting device 1C according to the third embodiment.

The block diagram of the control circuit 17 "shown in FIG. 9 is a block diagram of the control circuit 17 shown in FIG. 4 with the addition of the primary side voltage change amount estimation unit 181 and the secondary side voltage change amount estimation unit 182. The functions and configurations of the instantaneous value detection unit 171 and 173, the voltage change amount calculation unit 172, 174, the invalid power detection unit 176, the invalid power change amount calculation unit 177, and the voltage adjustment mode setting unit 179 will be described in the description of the control circuit 17. Since the contents are the same as those described above, the description thereof is omitted, and is specific to the third embodiment of the substation direction determination unit 175, the determination unit 178, the primary side voltage change amount estimation unit 181 and the secondary side voltage change amount estimation unit 182. The functions and configurations related to the operation of are described.

Determination unit 178 compares the reactive power Q preset threshold Q _TH a variation ΔQ of output from the reactive power variation amount calculating portion 177, the result judgment based on the comparison result to the substation direction judging section 175 Output. For example, _{if ΔQ> Q TH} , the determination unit 178 outputs the invalid power Q from the constant voltage control device installed on the secondary side line L ₂ , that is, the constant voltage control device is on the distribution line. Determined to be interconnected. _{Further, if ΔQ ≦ Q TH} , the determination unit 178 does not output the invalid power Q from the voltage constant control device to the secondary side line L ₂ , that is, the voltage constant control device is connected to the distribution line. Judge that there is no. The determination unit 178 outputs the determination result to the substation direction determination unit 175.

Substation direction judging section 175, if the decision result in the "constant voltage control without voltage constant control apparatus" is inputted from the judging unit 178, the variation of the primary voltage v ₁ in which the voltage change amount calculation unit 172 calculated Δv _The direction of the power supply substation is determined using 1 and the change amount Δv _{2 of the secondary side voltage v 2} calculated by the voltage change amount calculation unit 174. On the other hand, the substation direction determination unit 175 outputs the invalid power Q estimated by the primary side voltage change amount estimation unit 181 when the determination result of "the voltage constant control of the voltage constant control device is present" is input from the determination unit 178. When it is assumed that the change amount Δv _{1 '(estimated value) of the primary side voltage v 1} and the negative power Q estimated by the secondary side voltage change amount estimation unit 182 are not output. The direction of the power supply substation is determined using the amount of change Δv2'(estimated value) of the secondary side voltage v2. Then, the substation direction determination unit 175 outputs the determination result to the voltage adjustment mode setting unit 179.

Primary voltage change amount estimating unit 181 calculates the reactive power variation Delta] v 1 of the primary-side voltage v ₁ when Q has been assumed that no output _'. Primary voltage change amount estimating unit 181 calculates the amount of change Delta] v 1 _'primary voltage v ₁ in the following manner.

_{For example, it is assumed that the reactance portion x 1} of the system impedance from the SVR on the primary side to a predetermined voltage fixed point, which has been obtained in advance, is input to the primary side voltage change amount estimation unit 181 as a default value. Primary voltage change amount estimating unit 181, by dividing the amount of change ΔQ of the reactive power Q reactive power variation amount calculating portion 177 has calculated primary voltage v _1, the variation .DELTA.i _Q1 of the reactive current in the primary calculate.

Then, the primary side voltage change amount estimation unit 181 _{calculates the change amount Δv Q1} of the reactive voltage on the primary side by multiplying _{the change amount Δi Q1} of the reactive current on the primary side by the reactance component x ₁ , and calculates the voltage change amount. by portion 172 is vectorially subtracting the amount of change Delta] v _Q1 of reactive voltage from variation Delta] v ₁ of the calculated primary voltage v _1, the primary side voltage when the reactive power Q is assumed to not output v ₁ It calculates the amount of change Delta] v 1 _'.

The secondary-side voltage variation estimation unit 182 calculates the secondary-side voltage v ₂ of variation Delta] v 2 _'when the reactive power Q is assumed to not output. Secondary voltage variation estimation unit 182 also calculates a Delta] v 2 _'variation of the secondary side voltage v ₂ in the same manner as the primary side voltage variation estimation unit 181.

_{That is, the reactance portion x 2} of the system impedance from the SVR on the secondary side to the predetermined voltage fixed point, which has been obtained in advance, is input to the secondary side voltage change amount estimation unit 182 as a default value. Secondary voltage variation estimating unit 182, by dividing the amount of change ΔQ of the reactive power Q reactive power variation amount calculating unit 177 is calculated by the secondary-side voltage v _2, the amount of change in reactive current in the secondary side Calculate Δi _Q2.

Then, the secondary side voltage change amount estimation unit 182 calculates the secondary side reactive power change amount Δv _{Q2 by multiplying the secondary side reactive current change amount Δi Q2} by the reactance component x _2. second when the change amount calculation unit 174 by vectorially subtracting the amount of change Delta] v _Q2 of reactive voltage from variation Delta] v ₂ of calculated secondary voltage v _2, the reactive power Q is assumed to not output It calculates a change amount of the following side voltage _{v 2 Δv 2} '.

FIG. 10 is a flowchart showing a processing procedure of the voltage adjusting operation of the voltage adjusting device 1C.

In the flowchart shown in FIG. 10, in the flowchart shown in FIG. 5, the process of step S111 is replaced with the process of steps S112 and S113, and after the process of step S113, the procedure is changed to the procedure of proceeding to step S105.

The processing of step S112 calculates the primary voltage variation estimation unit 181, the variation of the primary voltage v ₁ on the assumption that there is no reactive power Q Delta] v 1 _', secondary voltage variation estimation unit 182 There is a process to calculate the secondary-side voltage v ₂ of variation Delta] v 2 _'on the assumption that there is no reactive power Q.

Step processing S113, the change in the instantaneous value detector 171 and the voltage change amount calculation unit 172 primary voltage is detected v ₁ variation Delta] v ₁ a primary voltage change amount estimating unit 181 has calculated primary voltage v ₁ replaced by an amount Delta] v 1 _', the instantaneous value detection unit 173 and the voltage change amount calculation unit 174 detects the secondary voltage v ₂ of variation Delta] v ₂ the secondary voltage variation estimation unit 182 calculates the secondary-side voltage v is a process of replacing the _second variation Delta] v ₂ '.

Since the contents of each process of steps S101 to S110 are the same as the contents described in the operation of the voltage adjusting device 1A using the flowchart of FIG. 4, the description of the processing of each step is omitted. The outline of the operation of 1C will be described.

The voltage regulator 1C when the distribution system in which the voltage regulator 1C is installed supplies power in the forward power transmission-forward power flow mode shown in FIG. 12 (a) or the forward power transmission-reverse power flow mode shown in FIG. 13 (a). The voltage adjusting operation of the above is the same as the voltage adjusting operation of the voltage adjusting device 1A described above. Further, the distribution system is switched from the forward power transmission-forward power flow mode or the forward power transmission-reverse power flow mode to the reverse power transmission-forward power flow mode shown in FIG. 12 (b) or the reverse power transmission-reverse power flow mode shown in FIG. 13 (b). The voltage adjusting operation of the voltage adjusting device 1C when the voltage is adjusted is the same as the voltage adjusting operation when the power transmission-power flow mode of the voltage adjusting device 1A described above is switched.

Next, for example, in the distribution system of the forward power transmission-forward power flow mode shown in FIG. 12A, for example, as shown in FIG. 15, an SVC having an AVR function is installed _{on the distribution line PL 2 on the secondary side.} When the configuration is changed, the voltage regulator 1C operates as follows.

When the voltage regulator 1C is a tap switching for automatically adjusting the secondary-side voltage v ₂ within the target voltage range V _AR2 on the secondary side on the basis of the information of the "power substation direction the primary side", the tap changeover In response to the change in the secondary side voltage v _{2 due to the above, the SVC installed in the distribution line PL 2} instantaneously outputs the invalid power Q to cancel the change in the _{secondary side voltage v 2.}

Voltage regulator 1C detects the amount of change ΔQ of the reactive power Q of the secondary side line L ₂ by tap switching is compared with a threshold value Q _TH that is determined and the amount of change ΔQ in advance. The voltage regulator. 1C, Delta] Q> if Q _TH, determines that the SVC installed on the secondary side line L ₂ has a constant voltage control. When the SVC controls the voltage to be constant, as described above, the voltage change amount corresponding to the tap switching _{is distributed to the primary side voltage v 1} and the secondary side voltage v ₂ , and both voltages v ₁ and v ₂ are changed. Therefore, it cannot be said that the determination of the direction of the power supply substation using the _{amount of change Δv 1} and the amount of change Δv _{2 is appropriate.}

Voltage regulator 1C is forward power transmission - in the distribution system of the forward power flow mode, if the SVC installed on the secondary side line L ₂ has the voltage constant control, in the flowchart shown in FIG. 10, step S112 from step S104, The process of proceeding to step S105 via S113 is performed.

In the reverse power transmission-forward power flow mode distribution system shown in FIG. 12 (b) or FIG. 13 (b), an _{SVC is installed on the primary side line PL 1} , and the voltage regulator 1C has a voltage of the primary side voltage v ₁ . Even when the SVC controls the voltage to be constant during the adjustment operation, the voltage adjustment device 1C performs the same processing. That is, in the flowchart shown in FIG. 10, the voltage adjusting device 1C performs a process of proceeding from step S104 to step S105 via steps S112 and S113.

In step S112, S113, voltage regulator 1C is reactive power Q is not (no voltage constant control of the SVC) and the primary voltage _{v 1} of assuming variation Delta] v ₁ 'and the secondary-side voltage _{v 2} variation Delta] v ₂ 'is calculated and the variation Delta] v ₂ of the variation Delta] v ₁ and the secondary-side voltage _{v 2} is detected primary voltage _{v 1} respectively change amount Delta] v ₁ in step S101' the amount of change Delta] v ₂ ' Perform the replacement process.

The voltage regulator 1C performs power substation direction determination using steps S105, S108 in variation Delta] v ₁ of the primary-side voltage _{v 1} 'and the secondary-side voltage _{v 2} of variation Delta] v _2'.

Primary voltage v ₁ of the variation Delta] v 1 _'and the secondary-side voltage v ₂ of variation Delta] v _2', since an estimated value assuming that SVC has not a constant-voltage control, for example, the secondary side for voltage regulation mode, variation Δv ₁ ', Δv _2', as shown in FIG. 16 (a), | Δv ₂ has a relation _{| '|> | Δv 1'} . Therefore, the variation Δv ₁ ', Δv _2' in the power substation direction determination using a voltage regulator 1C performs the process of step S108 to S110. That is, the voltage regulator 1C correctly determines that "the direction of the power supply substation is the primary side", maintains the information of "the direction of the power supply substation is the primary side" stored in the substation direction storage unit 179A, and at the same time, The voltage adjustment mode setting circuit 14 is held in the secondary side voltage adjustment mode.

Further, when the primary voltage regulating mode, the primary voltage _{v 1} of the variation Delta] v ₁ 'and the secondary-side voltage _{v 2} of variation Delta] v _{2' is, | Δv 1 '|> |} Δv 2' | relationship with Become. Therefore, the variation Δv ₁ ', Δv _2' in the power substation direction determination using a voltage regulator 1C performs the process of step S105 to S107. That is, the voltage regulator 1C makes a correct judgment that "the direction of the power supply substation is the secondary side", and the information of "the direction of the power supply substation is the primary side" stored in the substation direction storage unit 179A is "power supply substation". The location direction is changed to the content of "secondary side", and the voltage adjustment mode setting circuit 14 is switched to the primary side voltage adjustment mode.

As described above, in the voltage adjusting device 1C according to the third embodiment, when it is estimated that the voltage constant control device performs the voltage constant control when the voltage adjusting device 1C switches the tap, the voltage constant control device changes the voltage. is performed in the power substation direction determined (or verified) using _'variation Delta] v 2 with secondary side voltage v _2' variation of the primary voltage v ₁ Delta] v 1 when it is assumed that not the constant control , Voltage constant control It is possible to make a correct judgment by the judgment process in the direction of the power supply substation without being affected by the constant voltage control of the device.

Further, also in the third embodiment, in the determination of the power supply substation direction for each tap switching, the erroneous determination of the power supply substation direction can be avoided, so that the above-mentioned tap runaway can be prevented.

In the above-described first to third embodiments, whether or not the constant voltage control device performs constant voltage control with respect to the voltage fluctuation due to tap switching is determined by the change amount ΔQ of the reactive power Q, but the secondary side voltage. To determine whether or not the constant voltage control device has performed constant voltage control using the amount of change Δφ in the phase φ of v ₂ and the secondary current i _{2 or the amount of change Δcos (φ) in the power factor cos (φ).} It may be.

That is, the voltage regulators 1A, 1B, and 1C calculate the amount of change Δφ of the phase φ before and after the tap changer when the tap changers 12 and 12 ′ perform tap change, and set the change amount Δφ as a preset threshold value. Compare with φ _TH. If the voltage regulators 1A, 1B, and 1C have Δφ> φ _TH , the constant voltage control device outputs an invalid power Q to perform constant voltage control (that is, a power supply using the amount of change in voltage). Judgment of the direction of the substation is inappropriate), and _{if Δφ ≦ φ TH} , the constant voltage control device does not output the invalid power Q (that is, the judgment of the direction of the power supply substation using the amount of change in voltage). Is appropriate).

The phase φ of the secondary side voltage v ₂ and the _{secondary side current i 2 is, for example, the zero cross timing t v 0 at which the secondary side voltage v 2} crosses the zero level from negative to positive and the secondary side current i ₂ is zero. It may be acquired by _{detecting the zero cross timing t i0} that crosses the level from negative to positive and calculating the difference between the two detected values (| t _{v0 −} t _{i0 |).}

Further, the voltage regulators 1A, 1B, and 1C calculate the amount of change Δcos (φ) of the power factor cos (φ) before and after the tap change when the tap changers 12 and 12'are tap-switched, and the change thereof. The quantity Δcos (φ) is compared _{with a preset threshold value R TH.} The voltage regulator 1A, 1B, 1C, if Δcos (φ)> R _TH, the voltage constant control apparatus has an output to the voltage constant controlling reactive power Q (i.e., the variation of the voltage power substation direction determination using determines that improper), if Δcos (φ) ≦ R _TH, the voltage constant control apparatus does not output the reactive power Q (i.e., using the variation of the voltage The judgment in the direction of the power supply substation may be appropriate). The power factor cos (φ) on the secondary side may be obtained by calculating cos (φ) with respect to the phase φ obtained by the above method.

Alternatively, the voltage regulators 1A, 1B, and 1C have two or more of the amount of change ΔQ of the reactive power Q before and after tap switching, the amount of change Δφ of the phase φ, and the amount of change Δcos (φ) of the power factor cos (φ). A combination of parameters may be used to determine whether or not the constant voltage control device has performed constant voltage control.

Further, in the above-described first to third embodiments, when it is determined that the constant voltage control device has performed constant voltage control using the amount of change ΔQ of the reactive power Q, the determination result is output as shown in FIG. You may try to do it. Here, the output of the judgment result includes display on a display device such as a display, printing on a printing device such as a printer, notification by voice, transmission to an external device, storage on a recording medium, and other processing devices. It is a concept that includes delivery of processing results to other programs.

The voltage adjusting device 1D shown in FIG. 11 is the voltage adjusting device 1A shown in FIG. 1 provided with a communication unit 19 and an output unit 20. The voltage regulator 1D not only outputs the determination result of the determination unit 178 to the substation direction determination unit 175, but also transmits the determination result from the communication unit 19 to the external information terminal 2 via the network 3, and the output unit 20 transmits the determination result. Is output.

The communication unit 19 is a functional block that communicates the determination result to the external terminal device 2. The communication between the communication unit 19 and the terminal device 2 may be either wired or wireless, or may be a combination of wired and wireless. Therefore, the communication unit 19 is composed of a wired or wireless communication means. Further, the output unit 20 usually includes a display means and a voice output means, the display means displays the determination result as characters and images, and the voice output means outputs the determination result by voice.

The display means of the output unit 20 may be a display capable of displaying an image, or an indicator lamp such as a lamp. When the display means is a display, the determination result is displayed as characters or images. When the display means of the output unit 20 is an indicator light, for example, it turns off when the voltage constant control device does not exist, and turns on when the voltage constant control device exists, and the voltage adjusting device operates properly. You will be notified whether or not.

The information terminal 2 that has received the determination result performs output processing such as accumulating the determination result on the recording medium, displaying the determination result on the display of the terminal device 2, and outputting the determination result by voice from the speaker of the information terminal 2. The determination result may be displayed on another display device via the terminal device 2, the determination result may be printed by a printing device such as a printer, or the like. The information terminal 2 is, for example, a terminal installed in a business establishment that manages an electric power system, and FIG. 11 can notify a worker of the business establishment of the determination result of the determination unit 178 via the information terminal 2. It is a composition.

As with the voltage regulator 1A, the voltage regulator 1B and the voltage regulator 1C are also provided with the communication unit 19 and the output unit 20, and not only output the judgment result of the judgment unit 178 to the substation direction judgment unit 175. , It is preferable to transmit from the communication unit 19 to the external information terminal 2 via the network 3 and output the determination result by the output unit 20.

According to the configuration of the voltage adjusting device 1D shown in FIG. 11, the operator can grasp the adverse effect on the voltage adjusting operation of the SVR by the constant voltage control device, and if the adverse effect is large, for example, relocation of the SVR or AVR. It is possible to take measures such as stopping or prohibiting constant voltage control of power equipment having a function.

As described above, in the present invention, tap switching that does not require SVR while the SVC, PCS, etc. are performing constant voltage control and further unnecessary tap switching due to an erroneous determination in the direction of the power supply substation at that time occur. Can be said to be a very useful function of the SVR because the SVR itself can autonomously prevent the above.

The present invention can also contribute to promoting the spread of SVC, PCS and distributed power source compatible SVR. Especially in PCS for photovoltaic power generation, where the amount of interconnection has been increasing in recent years, even if the output suppression function that suppresses the interconnection point voltage to a certain voltage or higher by using constant voltage control works, tap runaway of SVR can be prevented. It also greatly contributes to the expansion of the grid interconnection amount of photovoltaic power generation.

In the first to third embodiments of the present embodiment, the voltage adjusting device using the direct switching type adjusting transformer has been described, but it goes without saying that the present invention can be applied to the voltage adjusting device using the indirect switching type adjusting transformer. .. Further, in the first to third embodiments, the three-phase voltage regulator provided on the three-phase power distribution line has been described, but it goes without saying that the present invention can also be applied to the single-phase voltage regulator.

1A, 1B, 1C, 1D Voltage regulator 11 Transformer (Transformer for voltage regulator)
12, 12'Tap changer 13 Voltage command circuit 13A Primary side voltage adjustment command circuit (tap change control means)
13B Secondary voltage adjustment command circuit (tap changer control means)
131 Instrument transformer 132 Voltage adjustment relay 133 Line voltage drop compensator (LDC)
134 Current transformer 14 Voltage adjustment mode setting circuit 15A Primary side voltage detector 15B Secondary side voltage detector 16 Secondary side current detector 17 Control circuit 171,173 Instantaneous value detection unit 172,174 Voltage change amount calculation unit 175 Current transformer Location judgment unit (judgment means, second judgment means)
176 Disabled power detector (element of change amount detecting means)
177 Invalid power change amount calculation unit (element of change amount detection means)
178 Judgment unit (judgment means)
179 Voltage adjustment mode setting unit (information update means)
179A Substation direction storage unit (storage means)
180 Tap position correction unit (tap position correction means)
181 Primary side voltage change amount estimation unit (voltage change amount calculation means)
182 Secondary side voltage change amount estimation unit (voltage change amount calculation means)
19 Communication unit (output means)
20 Output unit (output means)
2 Information terminal 3 Network

Claims (12)

It has a voltage adjustment transformer with a plurality of taps, and when the voltage of the distribution line deviates from the specified voltage range, the tap position of the voltage adjustment transformer is switched to automatically bring the voltage into the voltage range. In the voltage regulator that adjusts to
A change amount detecting means for detecting the amount of change before and after tap change of any one or more parameters of reactive power, phase and power factor due to the tap change operation of the voltage adjusting transformer.
Using the detection result of the change amount detecting means, a determination means for determining whether or not a power device having a constant voltage control function is connected to the distribution line, and a determination means.
A voltage regulator characterized by being equipped with. The determination means compares the detection value of the change amount detecting means with the threshold value, and if the detection value is equal to or more than the threshold value, determines that the power device is connected to the distribution line, and the detection value is the threshold value. The voltage adjusting device according to claim 1, wherein if it is smaller than, it is determined that the power device is not connected to the distribution line. A determination means for determining the direction of the power supply substation, which is a power supply source to the distribution line, is provided by using the amount of change in the voltage of the distribution line before and after the tap change operation of the voltage adjusting transformer.
When the determination means determines that the power device is connected to the distribution line, the determination means does not determine the direction of the power supply substation, and the determination means causes the power device to connect to the distribution line. The voltage adjusting device according to claim 1 or 2, wherein when it is determined that they are not interconnected, the direction of the power supply substation is determined. A storage means for storing substation direction information indicating the direction in which the power supply substation exists with respect to the voltage adjusting transformer, and
Based on the substation direction information stored in the storage means, the voltage on the side of the distribution line where the power supply substation does not exist is monitored, and when the voltage deviates from the voltage range, the voltage is changed to the voltage range. A tap switching control means that switches the tap position of the voltage adjusting transformer so that it fits inside.
An information updating means for updating the substation direction information stored in the storage means using the judgment result of the judging means, and an information updating means.
With
When the determination means determines that the power device is connected to the distribution line, the information update means does not update the substation direction information stored in the storage means, and the determination means does not update the substation direction information. The voltage adjusting device according to claim 3, wherein when it is determined that the power equipment is not connected to the distribution line, the substation direction information stored in the storage means is updated. 1 to claim 1, further comprising a tap position correcting means for correcting the tap position of the voltage adjusting transformer to a predetermined tap position when the determining means determines that the electric power device is connected to the distribution line. The voltage adjusting device according to any one of 4. The voltage adjusting device according to claim 5, wherein the tap position correcting means corrects the tap position of the voltage adjusting transformer to the tap position before switching. The voltage adjusting device according to claim 5, wherein the tap position correcting means corrects the tap position of the voltage adjusting transformer to a predetermined tap position. When the determination means determines that the power device is connected to the distribution line, the change amount of the voltage is calculated assuming that there is no change amount of the parameter detected by the change amount detection means. Voltage change calculation means and
A second determination means for determining the direction of power substations using the variation of the voltage the voltage change amount calculation means has calculated,
The voltage adjusting device according to claim 1 or 2. The voltage adjusting device according to any one of claims 1 to 8, further comprising an output means for outputting the determination result when the determination means determines that the power device is connected to the distribution line. The voltage adjusting device according to claim 9, wherein the output means outputs the determination result to a terminal device connected to the voltage adjusting device by wire or wirelessly. A method for determining the interconnection of voltage constant control devices of a voltage regulator that switches the tap position of a voltage adjustment transformer with multiple taps to adjust the voltage of the distribution line within a specified voltage range.
The amount of change before and after tap change of any one or two or more parameters of reactive power, phase and power factor due to the tap change operation of the voltage adjustment transformer is detected, and the detection result is used in the distribution line. A determination method comprising determining whether or not the constant voltage control device is connected. In the determination, the detected value of the amount of change before and after tap change of the parameter is compared with the threshold value, and if the detected value is equal to or greater than the threshold value, it is determined that the constant voltage control device is connected to the distribution line, and the above is described. The determination method according to claim 11, wherein when the detected value is smaller than the threshold value, it is determined that the voltage constant control device is not connected to the distribution line.

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