JP5855985B2 - Automatic voltage regulator - Google Patents

Description

  The present invention relates to an automatic voltage regulator that can adjust the voltage of two different distribution lines and can also handle a smart grid.

  In recent years, due to the increase in the size of electric equipment in consumers, the periodic load fluctuation (voltage drop) affects the customer premises and the power distribution system of the electric power company. Ferrant phenomenon has occurred in the distribution system of electric power companies, and there has been a situation in which the maintenance and management of legally appropriate voltage is hindered. Therefore, SSC (automatic voltage adjusting parallel capacitor device) and SSR (automatic voltage adjusting shunt) configured to open and close a plurality of power capacitors and shunt reactors in stages according to voltage fluctuations of the high voltage distribution line. (Reactor device) has been proposed (see, for example, Patent Documents 1 and 2), and is installed in a power distribution system, thereby stabilizing the voltage of a high-voltage distribution line.

  6A and 6B are diagrams for explaining an example of a conventional SSC. FIG. 6A is an outline view, and FIG. 6B is an internal connection diagram for the u line (in addition, the inside of the v line and the w line). Since the connection is the same as that of the u line, it is omitted here). As shown in this figure, the SSC 35 is installed on a gantry 42 installed between the distribution pole 40 and the support column 41 and is branched from the branch points 31 to 33 of the respective phases of the high-voltage distribution line M1. , V line, and w line are connected to the connection terminals 10 to 12 of the SSC 35 via the switch SW1.

  Inside the SSC 35, three power capacitors 50 to 52 each having a switch 44 to 46 and a series reactor 47 to 49 connected in series are connected in parallel to each other on the load side of the connection terminal 10. A control means 55 is connected to the load side of the connection terminal 10 via a control power transformer 54. The control means 55 is configured to open and close the switches 44 to 46 in response to fluctuations in the voltage signal from a voltage measurement means (not shown), whereby the rated capacities of the power capacitors 50 to 52 are configured. The reactive power is adjusted by the amount, and as a result, the voltage at the SSC installation 1 of the high-voltage distribution line M1 can be kept within an appropriate range.

  Recently, due to the decline in factory operation and electrification of houses, housing estates and condominiums, the power demand at night increases, and the difference in power demand between day and night, weekdays and holidays becomes significant, and the voltage fluctuation of the high-voltage distribution line further increases. In order to cope with this, it is necessary to add a voltage regulator to the distribution line.

Utility Model Registration No. 1875595 Specification Utility Model Registration No. 1803554 Specification

  By the way, the automatic voltage regulator installed in the distribution line in order to maintain an appropriate voltage can only be connected to one high-voltage distribution line. Connection switching work is required. In addition, such an automatic voltage regulator is equipped with a function to detect voltage fluctuation and automatically input the required capacity, but not all capacity is always used, but depending on the time zone and season There is a surplus capacity that is not used, and there is a low utilization rate.

  In order to solve the above-described problems, an object of the present invention is to provide an automatic voltage regulator capable of simultaneously monitoring and adjusting voltages of a plurality of different distribution lines, and as a result improving the utilization rate.

According to the present invention, the object is provided in series with a connection line capable of connecting different lines of distribution lines in phase with each other via a connection terminal and a connection line between the connection terminals (N +). 1) Total N groups each provided between a switch (N is an integer of 3 or more and 10 or less; the same shall apply hereinafter) and the adjacent switches so as to be connected in parallel to the distribution lines. Reactive power regulators, voltage measuring means for measuring the voltage of each distribution line of the plurality of systems, and each of the switches according to the magnitude of the voltage fluctuation obtained from the measurement results of these voltage measuring means It is achieved by an automatic voltage regulator characterized by comprising control means for controlling the opening / closing operation.

  In the present invention, the value of N (the number of connectable reactive power regulators) need only be within a common sense range, depending on the load status of two different distribution lines that are subject to voltage regulation. For example, it can be set to 10, 6, 4 or the like.

  As said reactive power regulator, what is provided with the capacitor | condenser for electric power or a shunt reactor can be used. The reactive power regulator including a power capacitor may further include a series reactor in each phase. This is to prevent excessive current from flowing through the power capacitor due to harmonics included in the power supply of any of the high-voltage distribution lines, and to suppress transient current when the power capacitor is turned on. In addition, the N reactive power regulators can appropriately set their respective rated capacities. For example, the reactive capacities of all reactive power regulators may be equalized, and the rated capacities of the reactive power regulators are changed. You can also. Preferably, all of the reactive power regulators are arranged with the same rated capacity.

  The control means is a voltage regulating relay or a device having the same function as this, and N switches are arranged from the first or Nth in accordance with voltage fluctuations of two different distribution lines. Those that can be controlled to open and close sequentially from the base in opposite directions are used. The control means also sets in advance which of the two high-voltage distribution lines should be preferentially voltage-adjusted (priority of control), with respect to one of the two distribution lines. It is preferable that the switch control and the other distribution line do not interfere with each other.

  Moreover, it is preferable that the control means has a bidirectional communication function. By providing the communication function in this way, the switching operation of each switch can be controlled remotely from the outside, and the magnitude of voltage fluctuation and the switching state of the switch can be controlled from the automatic voltage regulator of the present invention to the outside. Be able to send.

  The switch and the reactive power regulator can be configured as a unit for each device or collectively for each device. Further, the switch and the reactive power regulator can be configured by at least one unit in which these are connected in a one-to-one correspondence. Here, one-to-one refers not only to each one switch and reactive power regulator, but also to each two (switch-reactive power regulator-switch-reactive power regulator) and three each ( Switch-reactive power regulator-switch-reactive power regulator-switch-reactive power regulator). The switch and the reactive power regulator may be housed in at least one housing.

  The automatic voltage regulator of the present invention can be connected to two different high-voltage distribution lines, constantly monitoring the two distribution lines at the same time, and automatically changing the input capacity when there is a voltage fluctuation of a predetermined magnitude. The voltage can be adjusted by control, and it can be effectively dealt with when the distribution system must be changed due to construction or accidental power failure. In addition, since the number of automatic voltage regulators installed in the entire power distribution system can be minimized, construction costs and inspection costs can be reduced.

It is the figure which showed typically the external shape of one Embodiment of the automatic voltage regulator of this invention. It is a circuit diagram of one embodiment of an automatic voltage regulator of the present invention. It is a circuit diagram of another embodiment of the automatic voltage regulator of this invention. It is a flowchart which shows the example of control of the distribution line of one system | strain of the control apparatus in the automatic voltage regulator of this invention. It is a flowchart which shows the example of control of the distribution line of the other system | strain of the control apparatus in the automatic voltage regulator of this invention. It is a single line connection figure which shows another embodiment of the automatic voltage regulator of this invention. It is a single line connection figure which shows another embodiment of the automatic voltage regulator of this invention. It is the figure which showed typically the example of the conventional SSC.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an outline view of an embodiment of the automatic voltage regulator of the present invention. The automatic voltage regulator 1 of the present invention shown in this figure is placed on a pedestal 42 spanned between a power distribution column 40 and a column 41 in a state of being accommodated in a housing 1 and receives a power source. Connection terminals 10 to 12; 13 to 15 are provided. Two high-voltage distribution lines (system A and system B, each system is a three-phase alternating current), each system is supported by a brace arranged vertically on the distribution pole 40, the lower side The U-line, V-line, and W-line are connected to the automatic voltage regulator 1 of the present invention from the A system distribution line supported by the brace via the switch SW1 via the branch points 31 to 33 of each phase. Connected to terminals 10 to 12, respectively. Moreover, from the B system distribution line supported by the upper arm, the Uu line, the Vu line and the Wu line are connected to the connection terminals 13 to 15 via the switch SW2 via the branch points 34 to 36 of the respective phases. It is connected. It is assumed that a device having a configuration as shown in a circuit diagram of FIG. 2 or FIG.

  FIG. 2 is a circuit diagram of an embodiment of the automatic voltage regulator of the present invention provided with three power capacitors (N = 3) as reactive power regulators. In the present embodiment, a description will be given taking an apparatus with N = 3 as an example, but it goes without saying that this N value can be set within a common sense range as described above. In the present embodiment, connecting lines 17a to 19a; 17b to 19b for connecting different two distribution lines (system A and system B) in-phase with each other, and four switches GS1 to GS4 provided in the middle thereof , Between the switches GS1 and GS2; between GS2 and GS3; between the GS3 and GS4, the power capacitor devices LC1 to LC3 connected in parallel to the distribution lines of the A system and the B system, and the connection lines 17a to 19a and Voltage measuring means PT21 and PT22 for measuring the respective voltages of 17b to 19b and control means 24 for controlling the opening and closing operations of the switches GS1 to GS4 are provided. Each of power capacitor devices LC1 to LC3 has a configuration in which a reactor L1 and a power capacitor C1, a reactor L2 and a power capacitor C2, and a reactor L3 and a power capacitor C3 are directly connected to each other.

  The rated capacities of the power capacitors C1 to C3 are set to, for example, 200 KVA (equivalent capacity), respectively, depending on the load condition in the distribution line that is the object of voltage adjustment, or 100 KVA in the order of C1 to C3 or vice versa. , 200 KVA, 300 KVA, and the like. When the rated capacities of the power capacitor devices LC1 to LC3 are referred to as the sum of the rated capacities of the power capacitors C1 to C3 and the series reactors L1 to L3, the latter rating procedure is much smaller than that of the former. Therefore, in the following description, the rated capacities of the power capacitor devices LC1 to LC3 are regarded as equivalent to those of the power capacitors C1 to C3, and the “power capacitor devices LC1 to LC3” are simply referred to as “power capacitors LC1 to LC3”. It will be referred to as “LC3”. The voltage measuring means PT22 is also configured to function as a control power transformer Tr.

  Each of the switches GS1 to GS4 can be individually unitized. Each of the power capacitors LC1 to LC3 can also be unitized separately. Each of these devices can be unitized by a conventionally known method. In addition to unitizing each device in this way, for example, a unit provided with a connection terminal to the connection lines 17a to 19a and a connection terminal to the switch GS2 by combining the switch GS1 and the power capacitor LC1. You can also A unit combining GS2 and LC2 and a unit combining GS3 and LC3 can be formed in the same manner. In this case, the automatic voltage regulator 1 of the present invention can be constructed by connecting the switch GS4 to the unit of GS3 and LC3 and further connecting the connection lines 17b to 19b to the switch GS4. Furthermore, the switches GS1 to GS4 can be combined into one unit, and the power capacitors LC1 to LC3 can be combined into one unit. Such unitization can be similarly performed when the N value is set to be large and the number of connectable power capacitors and switches is increased.

  The control means 24 is a voltage regulating relay or a device having the same function as this, and a plurality of switches are connected from the A system side or the B system according to the magnitude of the voltage fluctuation of each of the A system and the B system. It can be controlled to open and close sequentially from the side. Moreover, the control means 24 is provided with a communication function, and can be comprised so that each of the switch GS1-GS4 can be opened and closed by remote control from the outside. This remote control includes not only control from a remote monitoring control system in an electric station or the like for remotely monitoring and controlling the distribution system in whole or in part, but also control by remote manual opening / closing operation. By enabling automatic and remote control in this way, there is an advantage that it can sufficiently cope with a smart grid (next-generation power transmission network).

  In the present embodiment, the switches GS1 to GS4, the power capacitors LC1 to LC3, the voltage measuring means PT21 and 22 and the control means 24 can be accommodated in one housing. When the N value is set larger and the number of connectable reactive power regulators and switches is increased, all these devices may be accommodated in one housing, and one or two or more of the above units may be accommodated. These groups may be divided into groups and each group may be housed in a housing.

  FIG. 3 is a circuit diagram of an embodiment of the automatic voltage regulator of the present invention (N = 3) provided with three shunt reactors as reactive power regulators. About the rated capacity of shunt reactor L1-L3, it can set suitably according to the condition of the load in the distribution line used as the object of voltage adjustment similarly to the said embodiment. Other configurations such as the N value are essentially the same as those in the above-described embodiment, and a duplicate description is omitted.

  Next, a control method in the automatic voltage regulator of the embodiment provided with three power capacitors as the reactive power regulator shown in FIG. 2 will be described. 4 is a flowchart for explaining the control on the A system side shown in FIG. 2, and FIG. 5 is a flowchart for explaining the control on the B system side shown in FIG.

  In the present invention, it is possible to set in advance the priority of voltage adjustment in two different distribution lines, that is, whether to preferentially adjust the voltage of either the A system or the B system. This priority is preferably set, for example, to a system having a larger daily voltage fluctuation among these two systems. Further, this priority may be switched for each time zone depending on the load situation for each time of these two systems. Here, it is assumed that the priority of the A system is higher than that of the B system. When voltage fluctuation occurs in the A system, the power capacitor base number (capacity) being turned on is checked for voltage adjustment of the distribution line of the B system investment described later (S01), and it is determined whether voltage adjustment is necessary. (S02). As a result, if voltage adjustment is not necessary, the switch GS is not opened / closed (S03), and the capacity of the capacitor being turned back on is checked first (S01). If the determination is a result that voltage adjustment is required, determination of the required input capacity C of the power capacitor (the input number of power capacitors LC1 to LC3) is performed (S04).

  When the determination result is C = 0 kvar, all the power capacitors LC1 to LC3 for the A system are opened (S06). For example, when the power capacitor LC1 is turned on, the switch GS1 is opened to open the power capacitor LC1. In order to open all the power capacitors LC1 to LC3, all the switches GS1 to GS4 may be opened (this state may be set as an initial state).

  As a result of the determination, if it is necessary to input as much as the rated capacity of the power capacitor LC1 as C, it is confirmed that the switch GS2 is open, or if it is closed, it is opened (S07), By closing the switch GS1 (S08), the power capacitor LC1 is turned on (S09). As a result of the determination, if it is necessary to input as the sum of the rated capacities of the power capacitors LC1 and LC2 as C, the switch GS3 is opened (S10), GS1 is input (S11), and the power capacitor LC1. (S12), the switch GS2 is then closed (S13), and the power capacitor LC2 is charged for the rated capacity (S14). Further, as a result of the determination, if it is necessary to input as the sum of the rated capacities of the power capacitors LC1 to LC3 as C, the switch GS4 is opened (S15), GS1 is input (S16), and the power capacitor An amount corresponding to the rated capacity of LC1 is charged (S17), then the switch GS2 is closed (S18), and the rated capacity of the power capacitor LC2 is charged (S19). Further, the switch GS3 is closed (S20), and the power capacitor LC3 is additionally turned on (S21). Regardless of the determination result, the process returns to the beginning after that, and again confirms the power capacitor capacity being turned on (S01) and determines whether or not voltage adjustment is necessary (S02). Thus, these series of steps are repeated.

  Next, in the case of a B system distribution line, if voltage fluctuation occurs in the distribution line, it is first determined whether or not voltage adjustment is required (S31). As a result, when voltage adjustment is not required, switching control of the switch GS is not required (G32). As a result of the determination, if voltage adjustment is necessary, it is next determined whether or not the input capacity can be adjusted (S33). In short, it is confirmed whether or not all the power capacitors LC1 to LC3 are turned on for the voltage adjustment of the A system, and if all are turned on, the input capacity can be adjusted. However, when part or all of them are in the open state, it is determined that the input capacity can be adjusted. As a result, when all the power capacitors LC to LC3 are turned on and the charged capacity cannot be adjusted, the opening / closing control of the switch GS becomes unnecessary (S34). If it is not necessary to control the switch GS in steps S32 and S34, it is first determined whether or not voltage adjustment is necessary (S31). On the other hand, if the input capacity can be adjusted, the required input capacity of the power capacitor is determined (S35).

  If C = 0 kvar as a result of the determination, the switch GS4 is opened (S36), and all the power capacitors LC1 to LC3 are opened as viewed from the B system (S37). If the result of determination is that it is necessary to input as much as the rated capacity of the power capacitor LC3 as C, it is confirmed that the switch GS3 is open, or is opened if it is closed (S38). Then, by closing the switch GS4 (S39), the power capacitor LC3 is turned on (S40). As a result of the determination, if it is necessary to input as the sum of the rated capacities of the power capacitors LC2 and LC3 as C, the switch GS2 is opened (S41), and GS4 is input (S42). (S43), the switch GS3 is then closed (S44), and an additional amount corresponding to the rated capacity of the power capacitor LC2 is added (S45). Furthermore, if it is necessary to input as the sum of the rated capacities of the power capacitors LC1 to LC3 as C as a result of the determination, the switch GS1 is opened (S46), GS4 is input (S47), and the power capacitor An amount corresponding to the rated capacity of LC3 is charged (S48), then the switch GS3 is closed (S49), and the rated capacity of the power capacitor LC2 is charged (S50). Further, the switch GS2 is closed (S51), and the power capacitor LC1 is additionally turned on (S52). Regardless of the determination result, the process returns to the beginning after that, and again determines whether or not voltage adjustment is necessary (S31). Thus, these series of steps are repeated.

  As mentioned above, taking the voltage adjustment of two different distribution lines as an example, several examples of the automatic voltage regulator of the present invention have been described together with their device configurations and control methods. Can also be applied to voltage adjustment of three or more different distribution lines. 6 and 7 respectively show internal device configuration examples of embodiments of an automatic voltage regulator applicable to voltage regulation of three different distribution lines. Each of these figures is shown as a single-line diagram for simplification, and a power capacitor is used as a reactive power regulator.

  In the embodiment of the automatic voltage regulator shown in FIG. 6, three different distribution lines can be connected to the connection terminals 30 to 32 provided in the housing 2. Inside the housing 2, connection lines 37 and 38 are connected in a so-called “dendritic shape” between the connection terminals 30-32 and between the connection terminals 31-32, respectively. Each connection line is provided with four switches GS1 to GS4 and GS5 to GS8, and each of the power capacitors LC1 to LC3 and LC4 to LC6 serves as a reactive power regulator between adjacent switches. (3 in each connection line) are connected. Control devices 40 and 41 are connected to the connection terminals 30 and 32 via voltage measuring means 34 and 35, respectively. The power of the control device 40 is supplied from the voltage measuring means 34 and 35, respectively. In addition, when the control device has the performance sufficient to control the switching of each switch between the A-C system and the B-C system, it is not necessary to provide two units as shown in the figure. Only one can be installed.

  An outline of the control in the case of performing voltage adjustment of the distribution lines of three systems (assumed to be the A system to the C system) by the automatic voltage adjusting device having such a configuration will be described. Even in the case of three systems, the priority of the system having the largest voltage fluctuation difference between the daytime, weekdays, and holidays is set to the highest priority, and the priority of the system having the smallest voltage fluctuation is set to the lowest. This priority may be switched for each time zone of the day.

The priority levels of the A system to the C system will be described separately.
(1) First, the priority of the three distribution lines is A system (high)> B system> C system (low) or B system (high)> A system> C system (low). When the voltage adjustment of the electric wire is unnecessary, the switch GSC is turned off, the automatic voltage regulator 2 is disconnected from the C system, and the voltage adjustment is controlled between the A system and the B system as shown in FIG. At this time, it is preferable that the switches GS4 and GS5 are controlled so as to open and close simultaneously.
(2) Moreover, when voltage adjustment of the distribution line of C system | strain is required, it can be operated as follows depending on which one of A system | strain and B system | strain has a low priority.
(2a) When the priority of the A system is lower than that of the B system, for example, the switch GS5 is shut off, and the switches GS1 to GS4 on the connection line 37 between these systems are as shown in FIG. Switching control is performed, and voltage adjustment can be performed for the B system by switching control of the switches GS1 to GS4 on the connection line 37.
(2b) When the priority of the B system is lower than that of the A system, the switch GS4 is cut off and the switches GS5 to GS8 on the connection line 38 between the B system and the C system are reversed. The switching control shown in FIG. 4 is performed, and the voltage adjustment by the switching control of the switches GS5 to GS8 on the connection line 38 can be performed for the A system.

(3) When the priority of the three distribution lines is A system (high)> C system> B system (low), and the automatic voltage regulator 2 can be disconnected from the B system by shutting off the switch GS8 The voltage of the A system and the C system can be adjusted by the opening / closing control of the switches GS1 to GS4 on the connection line 37. Further, for the A system having a high priority, the switch GS4 on the connection line 37 is cut off and the remaining switches GS1 to GS3 are controlled to open / close the switches GS5 to GS7 on the connection line 38 for the C system. You may adjust voltage by control.
(4) When the system B cannot be disconnected with the priority shown in the above (3), the switch GS4 on the connection line 37 is shut off, and the system A is controlled by the switches GS1 to GS4. The voltage is adjusted, and for the B system and the C system, the switch GS5 to GS8 on the connection line 38 are subjected to the same switching control as the above (2b), and the voltage of each of these systems can be adjusted.

(5) When the priority of the three distribution lines is B system (high)> C system> A system (low) and the switch GS1 is shut off and the automatic voltage regulator 2 can be disconnected from the A system, priority is given. For the high B system, the switch GS5 on the connection line 38 is cut off and the remaining switches GS6 to GS8 are controlled for opening and closing, and for the C system, the voltage is controlled by the switching control of the switches GS2 to GS4 on the connection line 37. Adjustments can be made.
(6) When the automatic voltage regulator 2 cannot be disconnected from the A system with the priority shown in the above (5), the switch GS5 on the connection line 38 is cut off, and the switches GS6˜ The voltage is adjusted by the opening / closing control of the GS8, and the opening / closing control of the switches GS1 to GS4 on the connection line 37 can be performed for the A system and the C system (see FIG. 4).

(7) In the case where the priority of the three distribution lines is C system (high)> A system> B system (low), and the automatic voltage regulator 2 can be disconnected from the B system by cutting off the switch GS8. The voltage adjustment of the A system and the C system can be performed by opening / closing control of the switches GS1 to GS4 on the connection line 37. In this case, the voltage adjustment of the C system is performed by the switching control of the switches GS5 to GS7 on the connection line 38, and the voltage adjustment of the A system is performed by the switching control of the switches GS1 to GS4 on the connection line 37. Can do.
(8) When the automatic voltage regulator 2 cannot be disconnected from the B system at the priority shown in (7) above, the voltage adjustment of the A system is performed by the open / close control of the switches GS1 to GS4 on the connection line 37. At the same time, it is possible to control the switching of the switches GS5 to GS8 on the connection line 38 for voltage adjustment of the B system and the C system. When the voltage adjustment of the C system is insufficient due to the opening / closing control of the switches GS5 to GS8, the voltage adjustment of both is performed by the opening / closing control of the switches GS1 to GS4 shown in FIG. be able to.

  In the embodiment of the automatic voltage regulator shown in FIG. 7, the connection lines 37 to 39 are respectively provided between the connection terminals 30-31, 30-32, and 31-32 provided in the housing (not shown). They are connected to form a so-called “loop”. Each of the connection lines 37 to 39 is provided with four switches GS1 to GS4, GS5 to GS8, and GS9 to GS12, respectively. Capacitors LC1 to LC3, LC4 to LC6, and LC7 to LC9 (three in each connection line) are connected. The connection terminals 30 to 32 are connected to the control device 42 via voltage measuring means 3436, respectively. The power source of the control device 42 is supplied from any one of the voltage measuring units 34 to 36. When connecting the distribution lines of each system to the automatic voltage regulator of the present embodiment, each phase is connected to each other via the switches GSA, GSB, GSC.

  In the embodiment of the automatic voltage regulator of FIG. 7, control in the case of performing voltage regulation of the distribution lines of three systems (assuming A system to C system) will be described next. In this case, first, set the highest priority for the system with the largest voltage fluctuations during the day, weekdays, and holidays, and set the lowest priority for the system with the smallest voltage fluctuations. As described above, the switching is possible for each time zone.

Below, the case where the priority of A system-C system is A system (high)> B system> C system (low) is explained, and the same control is performed when B system and C system have high priority. Therefore, the description is omitted. First, when the switch GSC is shut off and the automatic voltage regulator can be disconnected from the distribution line of the C system, one of the following voltage regulation modes can be adopted.
(1) For system A and system B, voltage adjustment is performed by switching control of switches GS1 to GS4 on connection line 37 as shown in FIG.
(2) For the A system with high priority, voltage adjustment is performed by switching control of the switches GS1 to GS4 on the connection line 37 or the switches GS9 to GS12 on the connection line 39, and for the B system, the connection line 38 The voltage adjustment is performed by the opening / closing control of the upper switches GS5 to GS8 or the switches GS1 to GS4 on the connection line 37.
(3) For the A system, the voltage is adjusted by the switching control of the switches GS5 to GS12 on the connection lines 39 and 38 or the switches GS9 to GS12 and GS91 to GS4 on the connection lines 39 and 37, and for the B system The voltage adjustment is performed by the switching control of the switches GS1 to GS4 on the connection line 37 or the switches GS5 to GS8 on the connection line 38.

The automatic voltage regulator of the present embodiment can be applied to voltage regulation of the three distribution lines as described above, and the connection lines and switches can be changed depending on the magnitude of voltage fluctuation of the distribution lines of each system and the load situation. There is an advantage that it can be selected from a plurality of variations. 6 and 7, the case where the power capacitor is used as the reactive power regulator has been described, but the same control can be performed when the shunt reactor is used. In the present embodiment, the reactive power adjuster can be changed to a power capacitor or a shunt reactor for each of a plurality of connection lines.

  The automatic voltage regulator of the present invention can be applied to voltage regulation of four or more distribution lines by further adding connection terminals, connection lines, switches, and reactive power regulators.

  As described above, the automatic voltage regulator of the present invention can be connected to a plurality of different high-voltage distribution lines, constantly monitoring the plurality of distribution lines at the same time, and there is a voltage fluctuation of a predetermined magnitude The voltage can be adjusted by automatically controlling the input capacity. The automatic voltage regulator of the present invention can effectively cope with a case where the distribution system must be changed due to construction or accidental power failure. Moreover, since the automatic voltage regulator of the present invention has a communication function, the input capacity can be changed by remote operation from the outside. Thus, the automatic voltage regulator of the present invention can maximize the reactive power regulator provided by itself and improve its utilization rate, and can also support a smart grid (next-generation power grid), The number of automatic voltage regulators installed in the entire power distribution system can be reduced, resulting in a reduction in construction costs and inspection costs.

  The automatic voltage regulator of the present invention can be suitably used for voltage regulation of a plurality of distribution lines in which, for example, reactive power is insufficient and excess cycles differ depending on each load condition. Although several embodiments of the present invention have been described in the present specification, the present invention is not limited to the following embodiments, and belongs to the scope of the present invention without departing from the subject matter of the present invention.

DESCRIPTION OF SYMBOLS 1 Automatic voltage regulator 10-15 Connection terminal 17a, 18a, 19a, 17b, 18b, 19b Connection line 21, 22 Voltage measuring means 24 Control means GS1-GS4 Switch LC1-LC3 Power capacitor apparatus L1-L3 Reactor C1- C3 Power capacitors

Claims (10)

A plurality of different distribution lines can be connected in phase with each other via connection terminals, and (N + 1) groups (N is 3 or more and 10 ) provided in series with the connection lines between adjacent connection terminals. The following integers; the same shall apply hereinafter), a total of N reactive power regulators each provided between the adjacent switches so as to be connected in parallel to the distribution lines, and the plurality Voltage measuring means for measuring the voltage of each distribution line of the system, and control means for controlling each switching operation of the switch according to the magnitude of voltage fluctuation obtained from the measurement results of these voltage measuring means. An automatic voltage regulator characterized by comprising: The automatic voltage regulator according to claim 1 , wherein the reactive power regulator includes a power capacitor or a shunt reactor. Wherein each reactive power regulator, automatic voltage regulator of claim 1 or 2 in which each has the same rated capacity. The automatic voltage adjustment according to any one of claims 1 to 3 , wherein the control means controls the opening / closing operation after a priority of voltage adjustment is set for the plurality of distribution lines. apparatus. The control means, automatic voltage regulator according to any one of claims 1-4 comprising a bidirectional communication function. The automatic voltage regulator according to any one of claims 1 to 5 , wherein the connection line is configured in a dendritic shape or a loop shape between the connection terminals. The automatic voltage regulator according to any one of claims 1 to 6 , wherein each of the switches and each of the reactive power regulators is configured as a unit. The automatic voltage regulator according to any one of claims 1 to 7 , wherein the switch and the reactive power regulator are configured by at least one unit connected in a one-to-one relationship. The switch and the reactive power regulator automatic voltage regulator according to any one of claims 1 to 8 comprising housed in at least one housing. The connection terminal which can connect the distribution line of each system of 3 systems or more was provided, and at least 1 system of the said distribution lines was connected to the said connection terminal via the switch. 2. The automatic voltage regulator according to item 1 .

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