JP2015073411A - Voltage control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage control system capable of compensating both of long periodic fluctuation and short periodic fluctuation of voltage.SOLUTION: A voltage control system 10 includes: a tap switching transformer 2 disposed on a power distribution system; a TVR 3 which is disposed at the secondary side of the tap switching transformer 2 and is capable of responding at a speed faster than the tap switching transformer 2; and voltage detectors 4 and 5 each for detecting a voltage on the power distribution system. The voltage control system 10 switches the tap value of the tap switching transformer 2 according to a long periodic element of the voltage detected by the voltage detector 4; and switches the tap value of the TVR 3 according to a periodic element shorter than the long periodic element of the voltage.

Description

  Embodiments described herein relate generally to a voltage control system that enables compensation for short-period fluctuations in addition to long-period fluctuations in voltage.

  Tap-switching transformers installed in the power distribution system can handle long-period voltage fluctuations by switching taps according to voltage fluctuations, but short-period voltage fluctuations caused by power generated by renewable energy, fluctuations in demand, etc. If the change is followed, frequent tap switching is required, which may shorten the life of the device. For this reason, short-cycle fluctuations may be dealt with by devices capable of high-speed control such as SVC (Static Var Compensator).

  However, when voltage fluctuations cannot be suppressed by a device that can be controlled at high speed, a tap-switching transformer is used, and depending on conditions, the life may be affected. As a countermeasure, it is only necessary to increase the capacity of a device capable of high-speed control, but the cost increases accordingly.

JP 2004-266915 A

  In the conventional voltage control system, the voltage at the location where the tap-switching transformer is installed is detected and the voltage is controlled by switching the tap, resulting in the generation of renewable energy or fluctuations in demand. When tracking short-term fluctuations in voltage, frequent tap switching is required, which may shorten the life of the equipment.

  An object of the present invention is to provide a voltage control system that can compensate for short-period fluctuations in addition to long-period fluctuations in voltage.

  In order to achieve the above-described object, a voltage control system according to an embodiment of the present invention includes a tap switching transformer installed on a power distribution system, and a tap switching transformer installed on the secondary side of the tap switching transformer. A voltage regulator capable of responding at a higher speed than the voltage transformer, and a voltage detector for detecting the voltage of the distribution system, and switching the tap according to a long-period component of the voltage detected by the voltage detector The tap value of the voltage regulator is switched, and the tap value of the voltage regulator is switched according to a component having a shorter period than a long period component of the voltage.

  The voltage control system according to another embodiment of the present invention includes a tap switching transformer installed on a distribution system, and a secondary side of the tap switching transformer. From the tap switching transformer, A power storage device that can respond at high speed, and a voltage detector that detects the voltage of the distribution system, and the tap-switchable transformer device according to the long-period component of the voltage detected by the voltage detector. The tap value is switched, and the power storage device outputs power according to a component having a shorter period than a long period component of the voltage.

1 is a schematic diagram showing the overall configuration of a voltage control system according to a first embodiment of the present invention. The figure which shows the detailed structure of the tap switching type transformer control means of the voltage control system which concerns on 1st Embodiment. The figure which shows the detailed structure of the TVR control means of the voltage control system which concerns on 1st Embodiment. The graph which shows the control action of the tap change type transformer control means shown in FIG. The figure which shows the other detailed structure of a TVR control means. Schematic which shows the whole structure of the voltage control system which concerns on the 2nd Embodiment of this invention. The figure which shows the detailed structure of the electric power storage apparatus control means I of the voltage control system which concerns on 2nd Embodiment. Schematic which shows the whole structure of the voltage control system which concerns on the 3rd Embodiment of this invention. The figure which shows the detailed structure of the electric power storage apparatus control means II of the voltage control system which concerns on 3rd Embodiment. The graph which shows an example of operation | movement of the electric power storage apparatus control means II shown in FIG. Schematic which shows the whole structure of the voltage control system which concerns on the 4th Embodiment of this invention. Schematic which shows the whole structure of the voltage control system which concerns on the 5th Embodiment of this invention. Schematic which shows the whole structure of the voltage control system which concerns on the 6th Embodiment of this invention. Schematic which shows the whole structure of the voltage control system which concerns on the 7th Embodiment of this invention.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS.
(Overall configuration of voltage control system 10)
As shown in FIG. 1, a voltage control system 10 according to the present embodiment includes a tap switching type transformer 2 provided on a distribution line 1 and a TVR (Thyristor Voltage Regukator: a tap type voltage regulator using a thyristor switch) 3. A voltage detector 4 for detecting the voltage of the distribution line 1 from a secondary voltage detection point of the tap switching transformer 2, and a tap switching transformer control means for performing tap switching control of the tap switching transformer 2 6, a voltage detector 5 that detects the voltage of the distribution line 1 from a voltage detection point on the secondary side of the TVR 3, and TVR control means 7 that performs tap switching control of the TVR 3. Among these, the tap switching type transformer control means 6 and the TVR control means 7 are means for suppressing voltage fluctuations caused by fluctuations in the output of the consumer load 8 and the distributed power source 9 such as a solar power generation system or a wind power generation system. This will be described in detail below.

(Tap switching type transformer control means 6)
FIG. 2 is a diagram showing a detailed configuration of the tap-switching transformer control means 6.
The tap-switching transformer control means 6 includes a low-pass filter 11, a voltage comparator 12, and a tap switch 13. Here, the low-pass filter 11 is means for removing the short-cycle component of the detected voltage and passing the long-cycle component of the detected voltage to the voltage comparator 12. The cutoff frequency of the low-pass filter 11 can be arbitrarily changed. Also, the voltage comparator 12 issues a switching command in the voltage lowering direction when the set voltage exceeds the upper threshold value, and switches the tap in the voltage increasing direction when the set voltage value deviates from the lower threshold value. It is a means to issue a command. Further, the tap changer 13 is means for controlling the tap changeable transformer 2 based on a change command from the voltage comparator 12.

(TVR control means 7)
FIG. 3 is a diagram showing a detailed configuration of the TVR control means 7. The TVR control means 7 is provided with a voltage comparator 14 and a tap switch 15 as in the tap switching type transformer control means 6 shown in FIG. 2, and controls TVR 3 based on the voltage detected by the voltage detector 5. It is means to do.

  The voltage comparator 14 issues a switching command in the direction of decreasing the voltage when it deviates from the upper threshold value of the set voltage, and issues a tap switching command in the increasing direction of the voltage when it deviates from the lower threshold value of the set voltage. It is a means to put out. The tap changer 15 is means for controlling the TVR 3 based on a change command from the voltage comparator 14. The operation of the voltage control system 10 configured as described above will be described with reference to FIGS.

(Function)
First, on the tap switching type transformer 2 side, the voltage detector 4 detects the voltage of the distribution line 1 from the voltage detection point on the secondary side of the tap switching type transformer 2. Next, the low-pass filter 11 of the tap-switching transformer control means 6 removes the short cycle component of the detected voltage and passes the long cycle component of the detected voltage to the voltage comparator 12. Based on the voltage component after passing through the low-pass filter 11, the voltage comparator 12 and the tap switch 13 control the tap-switching transformer 2.

  FIG. 4 shows the control operation of the tap switching type transformer control means 6. FIG. 4 shows the temporal change of the voltage component input to the voltage comparator 12 and the basic control operation for the tap-switchable transformer 2 by the tap switch 13. The voltage comparator 12 issues a switching command in the direction of decreasing the voltage when it deviates from the upper threshold value of the set voltage, and issues a switching command for tap in the increasing direction of the voltage when it deviates from the lower threshold value of the set voltage. To emit. The tap changer 13 switches the tap of the tap changeable transformer 2 according to a change command from the voltage comparator 12. However, when the tap is repeatedly switched in the same switching direction and there is no switching margin in the tap switching direction, the tap is not switched in the same direction.

  On the other hand, on the TVR3 side, the voltage detector 5 detects the voltage from the voltage detection point on the secondary side of the TVR3. Based on the voltage detected by the voltage detector 5, the voltage comparator 14 and the tap switch 15 control TVR3. The basic control operation of the TVR 3 is the same as that of the tap-switching transformer 2, and the voltage component input to the voltage comparator 14 is compared with the voltage upper and lower thresholds as shown in FIG. Switch taps when deviating.

  The TVR 3 can perform tap switching at high speed by switching using a high-speed switch. For this reason, by using the low-pass filter 11 for the tap-switching transformer 2, the long-period component of the voltage is shared, and for the TVR 3 capable of high-speed switching, the short-cycle component is shared by the tap-switching transformer 2. In addition, frequent tap switching that causes a reduction in the device life of the tap-switching transformer 2 is suppressed, and the effect of suppressing voltage fluctuation is improved.

(effect)
According to the voltage control system 10 of the present embodiment, the tap switching transformer 2 shares the tap switching control according to the long cycle component of the detected voltage, and the TVR3 has a shorter cycle than the tap switching transformer 2 of the detected voltage. It is possible to perform voltage control corresponding to short-period fluctuations in addition to long-period fluctuations of the entire distribution line by performing tap switching control according to the components. Therefore, according to the present embodiment, it is possible to compensate for short period fluctuations in addition to long period fluctuations in voltage.

(Modification of the first embodiment)
As a modification of the TVR control means 7 shown in FIG. 3, as shown in FIG. 5, a TVR control means 7 ′ provided with a low-pass filter 16 between the voltage detector 5 and the voltage comparator 14 can be used. The time constant T ₁ of the low-pass filter 16 is set to a cut-off frequency having a shorter time constant than the low-pass filter 10 so that T> T _{1 as} compared with the time constant T of the low-pass filter 10. With this low-pass filter 16, it is also possible to pass a component having a shorter period than that of the tap-switching transformer 2 to the voltage comparator 14 and share the short-period component with the TVR3.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

(Voltage control system 20)
As shown in FIG. 6, in the voltage control system 20 of the second embodiment, the power storage device 17, the voltage detector 18, and the power storage device control means I 19 are provided in the portion that shares the short cycle component of the voltage. Other than that, the configuration is the same as that of the voltage control system 10 of the first embodiment.

(Power storage device 17)
In general, the power storage device 17 includes a device having a fast control response such as a storage battery, an electric double layer capacitor, or a flywheel. Since such devices have restrictions on the amount of power that can be stored, if voltage compensation is performed including a long period component of the voltage, it may deviate from the stored power amount constraints (SOC constraints, etc.) and may not be controllable. . For this reason, in this embodiment, the risk of deviation from the stored power amount constraint is reduced and voltage control is performed more reliably by compensating only the short-cycle component of the voltage using a high-pass filter 22 described later.

(Voltage detector 18)
The voltage detector 18 is a means for detecting the voltage of the distribution line 1 from the voltage detection point on the secondary side of the power storage device 17.

(Power storage device control means I 19)
FIG. 7 is a diagram showing a detailed configuration of the power storage device control means I19. The power storage device control means I 19 includes a reference voltage device 21 that arbitrarily sets a reference voltage, a high-pass filter 22 that passes only a short cycle component of the voltage, and a gain multiplier 23 that multiplies the received short cycle component by a gain. And a basic controller 24 that calculates the control amount of the power storage device 17 from the received value.

  The reference voltage of the reference voltage device 21 and the cutoff frequency of the high-pass filter 22 can be arbitrarily changed. In addition, the reference voltage set by the reference voltage device 21 is not only a constant value, but can also be periodically reviewed or used as a long-period component of the voltage detection value. Furthermore, the gain to be set is set in advance according to the control response speed of the power storage device 17 and the sensitivity of voltage fluctuation on the distribution line. The operation of the voltage control system 20 configured as described above will be described with reference to FIG.

(Function)
First, the connection point of the power storage device 17 is set as a voltage detection point, and the voltage on the distribution line is acquired by the voltage detector 18. Next, a differential voltage obtained by subtracting the voltage acquired from the voltage detector 18 from the reference voltage set by the reference voltage device 21 of the power storage device control means I 19 is calculated. When the sign of the differential voltage is positive, the voltage on the distribution line is lower than the reference voltage, so the voltage is increased by making the active power output from the power storage device 17 the discharge direction and the reactive power capacitive. On the other hand, since the voltage on the distribution line is higher than the reference voltage when the sign of the differential voltage is negative, the voltage is lowered by making the active power output from the power storage device 17 the charging direction and the reactive power inductive.

  The differential voltage is transmitted to the high pass filter 22, and the high pass filter 22 passes only the short period component of the difference value of the received voltage and transmits it to the gain multiplier 23. The gain multiplier 23 multiplies the received short cycle component by a gain and transmits the result to the basic controller 24.

  The basic controller 24 calculates the control amount of the power storage device 17, that is, the active power and the reactive power to be output from the power storage device 17 from the value received from the gain multiplier 23, and issues a control command to the power storage device 17. Send. The power storage device 17 outputs active power and reactive power according to the control command.

(effect)
According to the voltage control system 20 of the present embodiment, the tap switching control device 2 shares the tap switching control according to the long period component of the detected voltage, and the power storage device 17 uses the detected voltage tap switching device 2. In addition, by performing tap switching control according to short cycle components, voltage control corresponding to short cycle fluctuations can be performed in addition to long cycle fluctuations of the entire distribution line. Therefore, according to the present embodiment, it is possible to compensate for short period fluctuations in addition to long period fluctuations in voltage.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same component as 2nd Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

(Voltage control system 30)
As shown in FIG. 8, in the voltage control system 30 of the third embodiment, a current detector 26 and a power calculator 27 are further provided in the portion that shares the short-cycle component of the voltage, and the power storage device control means I 19 is provided. It is comprised similarly to the voltage control system 20 of 2nd Embodiment except having provided the electric power storage apparatus control means II25 instead.

(Power storage device control means II 25)
FIG. 9 is a diagram showing a detailed configuration of the power storage device control means II 25. The power storage device control means II 25 includes a reference power unit 28 that arbitrarily sets a reference power, a high-pass filter 29 that allows only a short period component of power to pass through, and a gain multiplier 31 that multiplies the received short period component by a gain. And a basic controller 32 that calculates the control amount of the power storage device 17 from the received value. Here, the reference power of the reference power unit 28 can be arbitrarily set, may be a constant value, may be updated periodically, or the long-period component of the active power flow calculated by the power calculator 27 May be set. Further, the cutoff frequency of the high-pass filter 29 can be arbitrarily changed. Furthermore, the gain to be set is set according to the control response speed of the power storage device 17 and the sensitivity of voltage fluctuation on the distribution line.

(Function)
In the second embodiment, the power storage device 17 is controlled based on the measured voltage. In the third embodiment, the current detector 26 detects the current on the distribution line, and the voltage detector 18 detects the voltage on the distribution line. Based on the detected voltage / current, the power calculator 27 calculates the effective power flow on the distribution line, and controls the power storage device 17 in accordance with the calculated effective power flow on the distribution line. Hereinafter, this control method will be specifically described with reference to FIGS.

  First, a current is detected by the current detector 26 on the distribution line 1. The current detector 26 is a current detected from a current detection point on the upper (power supply) side as viewed from the power storage device 17 or a lower (load) side as viewed from the power storage device 17. It has a function of selecting the current detected from the current detection point. With this function, when the power flow of the distribution line is a forward flow (a flow from the upper side to the lower side), the current is detected from the current detection point on the upper (electric power system) side, and the flow of the distribution line is the reverse flow (lower side) In the case of the power flow from the power source to the upper side), the current to be detected is not affected by the output current of the power storage device 17 by detecting the current from the current detection point on the lower side (power system) side. Thereby, for example, a target current (see FIG. 10) obtained by smoothing the detected current by the moving average method is set, and the power storage device 17 is compensated for a power component that fluctuates quickly, thereby reducing the required capacity of the power storage device 17. It becomes possible to reduce.

  Next, the voltage is detected by the voltage detector 18 shown in FIG. 8, the active power flow is calculated by the power calculator 27 based on the detected voltage / current, and the reference set by the reference power device 28 shown in FIG. The difference power subtracted from the power is transmitted to the high pass filter 29. The high-pass filter 29 passes only the short period component of the received power difference value and transmits it to the gain multiplier 31.

  The gain multiplier 31 multiplies the received short cycle component by a gain and transmits the result to the basic controller 32. The basic controller 32 calculates the control amount of the power storage device 17, that is, the active power and the reactive power to be output from the power storage device 17 from the value received from the gain multiplier 31, and issues a control command to the power storage device 17. Send. The power storage device 17 outputs active power and reactive power according to the control command.

(effect)
According to the voltage control system 30 of the present embodiment, the tap switching control device 2 shares the tap switching control according to the long period component of the detected voltage, and the power storage device 17 uses the detected voltage tap switching device 2. In addition, by performing tap switching control according to short cycle components, voltage control corresponding to short cycle fluctuations can be performed in addition to long cycle fluctuations of the entire distribution line. Therefore, according to the present embodiment, it is possible to compensate for short period fluctuations in addition to long period fluctuations in voltage.

  In the third embodiment, since the power storage device 17 is controlled in accordance with the power on the distribution line, voltage fluctuation caused by power fluctuation on the distribution line can be suppressed, and the amount of power fluctuation and the speed of power fluctuation are reduced. As a result, it is possible to contribute to suppression of frequency fluctuation caused by power fluctuation.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as 3rd Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

(Voltage control system 40)
As shown in FIG. 11, in the voltage control system 40 of the fourth embodiment, the current detector 34, the voltage detector 18, and the detected current / voltage detected at the installation point of the distributed power source 9 respectively. The configuration is the same as that of the voltage control system 30 of the third embodiment except that a power calculator 35 for calculating the generated power of the distributed power source 9 is provided. Moreover, since the power storage device control means III 33 has the same configuration as the power storage device control means II 25 of the third embodiment, description thereof is omitted.

  The connection place of the customer load 8 and the distributed power supply 9 is arbitrary, and is not limited to the place shown in FIG. Further, the customer load 8 and the distributed power source 9 are not limited to one, and a plurality of customer loads 8 and distributed power sources 9 may exist. In this case, for example, when there is no significant difference in the capacity of each distributed power source, such as a residential solar power generation system, the average of the current and voltage at the installation point of each distributed power source is passed to the power calculator 35. When large-scale distributed power sources such as large-scale wind power generation and solar power generation are ubiquitous among the distributed power sources, the current / voltage at the installation point of the large-capacity distributed power source is passed to the power calculator 35 as a representative value. You can also.

(Function)
In the voltage control system 40 of the present embodiment, the current is detected by the current detector 34 that detects the current at the installation point of the distributed power supply 9, and the voltage at the installation point of the distributed power supply 9 is detected by the voltage detector 18. The current / voltage is input to the power calculator 35 to calculate the generated power of the distributed power source 9, and the power storage device 17 is controlled according to the calculated generated power.

(effect)
According to the voltage control system 40 of the present embodiment, the tap switching control device 2 shares the tap switching control according to the long period component of the detected voltage, and the power storage device 17 uses the detected voltage tap switching device 2. In addition, by performing tap switching control according to short cycle components, voltage control corresponding to short cycle fluctuations can be performed in addition to long cycle fluctuations of the entire distribution line. Therefore, according to the present embodiment, it is possible to compensate for short period fluctuations in addition to long period fluctuations in voltage.

  Further, according to the voltage control system 40 of the present embodiment, for example, the power in the vicinity of the distributed power source 9 having a large output, such as a mega solar such as a large-capacity solar power generation system or a wind farm such as a large-capacity wind power generation system. By detecting this and controlling the power storage device 17, it is possible to directly suppress the output fluctuation of the distributed power supply 9 and to effectively suppress the voltage fluctuation caused by it.

[Fifth Embodiment]
A fifth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

  In the present embodiment, the voltage control system 10 of the first embodiment and the voltage control system 20 of the second embodiment are combined. That is, with respect to the voltage control system 10 of the first embodiment having the tap changeable transformer 2 and TVR3, the power storage device 17 and the voltage detector 18 of the second embodiment are further provided on the secondary side of TVR3. And an electric power storage device control means I19.

  In the voltage control system 50 of the present embodiment, the tap-switching transformer 2 is controlled by the tap-switching transformer control means 6 according to the long-period component of the voltage detected by the voltage detector 4 as in the first embodiment. The TVR 3 is controlled by the TVR control means 7 in accordance with the voltage detected by the voltage detector 5. Similarly to the second embodiment, the power storage device 17 is controlled by the power storage device control means I 19 in accordance with the detection voltage of the voltage detector 18.

  In the voltage control system 50 of the present embodiment, three types of voltage fluctuation suppressing control devices are introduced, fluctuations in units of several minutes are performed by the tap-switching type transformer 2, and fluctuations in units of several tens of seconds are performed by TVR3, in milliseconds. A low-pass filter and a high-pass filter are set so that fluctuations in units of several seconds are shared and controlled by the power storage device 16. Thus, according to the present embodiment, each device can be operated in a coordinated manner, and the power storage device 17 can compensate only the short-cycle power component, so that the power storage device is generally expensive. 17 capacity can be reduced.

[Sixth Embodiment]
A sixth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

  In the present embodiment, the voltage control system 10 of the first embodiment and the voltage control system 30 of the third embodiment are combined. That is, with respect to the voltage control system 10 of the first embodiment having the tap changeable transformer 2 and TVR3, the current detector 26 and the power calculator 27 of the third embodiment are further provided on the secondary side of TVR3. , A power storage device 17, a voltage detector 18, and a power storage device control means II 25 are provided.

  In the fifth embodiment, the power storage device 17 is controlled according to the voltage on the distribution line, whereas in the sixth embodiment, the current on the distribution line detected by the current detector 26 by the power storage device 17 Control is performed according to the power on the distribution line calculated by the power calculator 27 from the voltage on the distribution line detected by the voltage detector 18.

  In the voltage control system 60 of the present embodiment, the tap-switching transformer 2 is controlled by the tap-switching transformer control means 6 according to the long-period component of the voltage detected by the voltage detector 4 as in the first embodiment. The TVR 3 is controlled by the TVR control means 7 in accordance with the voltage detected by the voltage detector 5. Similarly to the third embodiment, on the distribution line 1 calculated by the power calculator 27 from the current on the distribution line detected by the current detector 26 and the voltage on the distribution line detected by the voltage detector 18. In accordance with the power, the power storage device 17 is controlled by the power storage device control means II 25.

  According to the voltage control system 60 of the present embodiment, as in the voltage control system 50 of the fifth embodiment, three types of voltage fluctuation suppression control devices are introduced, and fluctuation components with different time orders for each controller. Thus, the capacity of the power storage device 17 can be reduced and the fluctuation suppression effect can be improved.

  Furthermore, in the voltage control system 60 of the present embodiment, as in the third embodiment, the power storage device 17 can reduce the amount of power fluctuation and the speed of power fluctuation, thereby contributing to the suppression of frequency fluctuation caused by power fluctuation. be able to.

[Seventh Embodiment]
A seventh embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description regarding the overlapping structure and effect | action is abbreviate | omitted.

  In the present embodiment, the voltage control system 10 of the first embodiment and the voltage control system 40 of the fourth embodiment are combined. That is, with respect to the voltage control system 10 of the first embodiment having the tap changeable transformer 2 and TVR3, the current detector 34 and the power storage device 17 of the fourth embodiment are further provided on the secondary side of TVR3. , A voltage detector 18, a power calculator 35, and a power storage device control means III 33 are provided.

  In the fifth embodiment, the power storage device 17 is controlled according to the voltage on the distribution line, whereas in the seventh embodiment, it is controlled according to the generated power of the distributed power source.

  In the voltage control system 70 of the present embodiment, the tap-switching transformer 2 is controlled by the tap-switching transformer control means 6 in accordance with the long-period component of the voltage detected by the voltage detector 4 as in the first embodiment. The TVR 3 is controlled by the TVR control means 7 in accordance with the voltage detected by the voltage detector 5. Similarly to the fourth embodiment, the current at the installation point of the distributed power supply 9 is detected by the current detector 34, the voltage at the installation point of the distributed power supply 9 is detected by the voltage detector 18, and the detected current A voltage is input to the power calculator 35 to calculate the generated power of the distributed power source 9, and the power storage device 17 is controlled by the power storage device control means III 33 according to the calculated generated power.

  According to the voltage control system 70 of the present embodiment, as in the voltage control system 50 of the fifth embodiment, three types of voltage fluctuation suppressing control devices are introduced, and fluctuation components with different time orders for each controller. Thus, the capacity of the power storage device 17 can be reduced and the fluctuation suppression effect can be improved.

  Further, in the voltage control system 70 of the present embodiment, as in the fourth embodiment, for example, a large output such as a mega solar such as a large-capacity solar power generation system or a wind farm such as a large-capacity wind power generation system. By detecting the power in the vicinity of the power supply 9 and controlling the power storage device 17, the output fluctuation of the distributed power supply 9 can be directly suppressed, and the voltage fluctuation resulting therefrom can be effectively suppressed. become.

[Other embodiments]
(1) In the low-pass filters 11 (FIG. 2) and 16 (FIG. 5) in the first embodiment, transfer functions such as 1 / (1 + TS) and 1 / (1 + T ₁ S) are used. For example, a moving average may be used. When the moving average is used, the tap switching type transformer 2 may be set to have a longer time window for calculating the moving average than TVR3.

(2) In the TVR control means 7 ′ shown in FIG. 5, the low-pass filter 16 is used. However, a band-pass filter can be used in addition to this.

(3) In the second embodiment, the power storage device 17 has been described as an example of a device that can be controlled by active power and reactive power, but only reactive power such as SVC (Static Reactive Power Compensator) can be controlled. Equipment may be used. In this case, since the active power is 0, only reactive power is calculated using the configuration of the power storage device control unit I 19 shown in FIG.

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

DESCRIPTION OF SYMBOLS 1 ... Distribution line 2 ... Tap change-type transformer 3 ... TVR
4 ... Voltage detector 5 ... Voltage detector 6 ... Tap switching type transformer control means 7, 7 '... TVR control means 8 ... Consumer load 9 ... Distributed power supply 10, 20, 30, 40, 50, 60, 70 ... Voltage control system 11 ... Low pass filter 12 ... Voltage comparator 13 ... Tap switch 14 ... Voltage comparator 15 ... Tap switch 16 ... Low pass filter 17 ... Power storage device 18 ... Voltage detector 19 ... Power storage device control means I
21 ... Reference voltage device 22 ... High pass filter 23 ... Gain multiplier 24 ... Basic controller 25 ... Power storage device control means II
26 ... Current detector 27 ... Power calculator 28 ... Reference power device 29 ... High pass filter 31 ... Gain multiplier 32 ... Basic controller 33 ... Power storage device control means III
34 ... Current detector 35 ... Power calculator

Claims (8)

A tap-switching transformer installed on the power distribution system;
A voltage regulator installed on the secondary side of the tap-switching transformer, and capable of responding at a higher speed than the tap-switching transformer;
A voltage detector for detecting the voltage of the distribution system;
With
The tap value of the tap-switching transformer is switched according to the long-period component of the voltage detected by the voltage detector, and the tap value of the voltage regulator according to a component having a shorter period than the long-period component of the voltage. A voltage control system characterized by switching.   The voltage control system according to claim 1, wherein the voltage regulator is a tap type voltage regulator using a thyristor switch. A tap-switching transformer installed on the power distribution system;
A power storage device installed on the secondary side of the tap-switching transformer, and capable of responding at a higher speed than the tap-switching transformer;
A voltage detector for detecting the voltage of the distribution system;
With
The tap value of the tap-switching transformer is switched according to a long-period component of the voltage detected by the voltage detector, and the power storage device supplies power according to a component having a shorter period than the long-period component of the voltage. A voltage control system characterized by output.   A power calculator for calculating the power of the distribution line on the secondary side of the tap switching transformer is further provided, and the tap value of the tap switching transformer according to the long period component of the voltage detected by the voltage detector The voltage control system according to claim 3, wherein the power storage device outputs power according to the power calculated by the power calculator.   A power calculator for calculating the output power of the distributed power source on the secondary side of the tap-switching transformer is further provided, and the tap-switching transformer of the tap-switching transformer according to the long-period component of the voltage detected by the voltage detector The voltage control system according to claim 3, wherein the power storage device outputs power in accordance with output power of the distributed power source calculated by the power calculator by switching tap values.   A voltage regulator is further provided between the tap switching transformer and the power storage device, which responds at a higher speed than the tap switching transformer and at a lower speed than the power storage device. Switching the tap value of the tap-switching transformer according to the long-period component of the voltage detected by the voltage regulator, switching the tap value of the voltage regulator according to a component of a shorter period than the long-period component of the voltage, The voltage control system according to claim 3, wherein the power storage device outputs power in accordance with a component having a shorter period than the component having a short period.   A voltage regulator is further provided between the tap switching transformer and the power storage device, which responds at a higher speed than the tap switching transformer and at a lower speed than the power storage device. Switching the tap value of the tap-switching transformer according to the long-period component of the voltage detected by the voltage regulator, switching the tap value of the voltage regulator according to a component of a shorter period than the long-period component of the voltage, The voltage control system according to claim 4, wherein the power storage device outputs power according to the power calculated by the power calculator. A voltage regulator is further provided between the tap switching transformer and the power storage device, which responds at a higher speed than the tap switching transformer and at a lower speed than the power storage device. Switching the tap value of the tap-switching transformer according to the long-period component of the voltage detected by the voltage regulator, switching the tap value of the voltage regulator according to a component of a shorter period than the long-period component of the voltage, The voltage control system according to claim 5, wherein the power storage device outputs power in accordance with output power of the distributed power source calculated by the power calculator.

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