JP6668128B2 - Reactive power compensator - Google Patents

Description

  The present invention relates to a reactive power compensating device that compensates for reactive power of a system.

  In recent years, from the viewpoint of promoting the spread of renewable energy and efficient operation of energy, distributed power sources such as solar power generation and smart grids have been spreading. When a large number of distributed power sources are introduced into a power distribution system or smart grids become widespread, the system voltage becomes unstable and power may not be supplied stably. Therefore, conventionally, a reactive power compensator called a self-excited SVC [Static Var Compensator], SVG [Static Var Generator], or STATCOM [STATic synchronous COMpensator], which stabilizes the system voltage by compensating for the reactive power of the system. Is being developed and introduced.

  In the present specification, a reactive power compensating device is a device that controls an inverter and continuously adjusts system voltage by continuously outputting reactive power (for example, a device having a voltage-type inverter. As an example of the reactive power compensating device, there is Japanese Patent Application Laid-Open No. 2013-212021 [Patent Document 1], and as an example of the reactive power compensating device provided with the current-source inverter, Japanese Patent Publication No. 3-40855 [Patent Document 2] ]).

JP 2013-212021 A Japanese Patent Publication No. 3-40855 Japanese Patent No. 5311370 Kazuo Takasugi, Yukio Yuino, et al. "Distribution system stabilization technology by applying a new control self-excited SVC", Hitachi Review, Vol. 82 No. 4 (April 2000)

  The reactive power compensator may be provided in a substation or a switchyard, or may be provided in the middle of a power system. In order to facilitate the installation space and track layout, and to facilitate construction work, the reactive power compensator, which is installed in the middle of the power system, is mounted on a single power pole (hereinafter referred to as "single pole mounting"). It is desired that the structure be as small and lightweight as possible.

As disclosed in Japanese Patent No. 5311370 (Patent Document 3), a small and lightweight device that can be mounted on a single pole has been developed as a voltage regulator using a shunt reactor. However, the reactive power compensator requires a large transformer, capacitor, and reactor to connect the system and the inverter, and it is difficult to configure the reactive power compensator so small and lightweight that it can be mounted on a single pole. Met. For example, Kazuo Takasugi, Yukio Yuino, et al., "Distribution System Stabilization Technology by Applying New Control Self-Excited SVC", Hitachi Review, Vol. 82 No. 4 (April 2000) (Non-Patent Document 1) has a volume of about 5.3 m ³ and a weight of about 4.8 t. It is loaded between telephone poles.

In addition, since there is no unified standard for the volume and weight of equipment that can be mounted on a single pole because it depends on the situation of the electric power company, the volume is generally 2 m when loaded on one side of the utility pole. It is considered that an increase of about 10 to 20% can be tolerated when the battery is loaded on both sides of a utility pole with a weight of about ³ and a weight of about 2.3 tons, as compared with a case of being mounted on one side.

  An object of the present invention is to provide a reactive power compensator that is small and light enough to be mounted on a single pole while having a transformer and a reactor.

  Like the reactive power compensating device described in Non-Patent Document 1, many of the practically used reactive power compensating devices of the system include a voltage-type inverter because of the easiness of control and the like. An object of the present invention is to improve a reactive power compensator provided with a current source inverter in order to reduce the size and weight. Since the current source inverter does not require a reactor for a system or a DC capacitor, it is advantageous for miniaturization and weight reduction.

  A reactive power compensator according to the present invention includes a transformer having a primary side connected to a system (including a high-voltage line), a self-excited current source inverter device having an AC side connected to a secondary side of the transformer, and a self-excited current source. A DC reactor device connected to the DC side of the inverter device, a transformer for detecting a voltage value and a current value of the system, and a control signal for controlling the self-excited current source inverter device based on the voltage value and the current value. And an oil storage case for storing at least the transformer, the DC reactor and the transformer together with the insulating oil. The self-excited current-source inverter device is composed of n (n is an integer of 2 or more) self-excited current-source inverter circuits whose DC sides are connected in series, and the DC reactor device is composed of n serially-connected inverter devices. It is characterized by comprising one DC reactor connected in series to a self-excited current source inverter circuit.

  By configuring the self-excited current-source inverter device from n self-excited current-source inverter circuits in this manner, a self-excited current-source inverter circuit is configured as compared with the case of one self-excited current-source inverter circuit. Voltage (e.g., IGBT) can be reduced to 1 / n. In addition, since the DC reactor device is composed of one DC reactor, it is not necessary to provide a DC reactor in each of the self-excited current type inverter circuits, and the current value flowing through one DC reactor is reduced to 1 / n. be able to. As a result, the required number of DC reactors can be reduced and the DC reactor device can be reduced in size while securing the required rated compensation capacity. Further, in the present invention, since the transformer, the DC reactor device, and the transformer are housed together with the insulating oil, the insulation distance of each device can be shortened, and the devices can be housed in one housing case. .

  For example, when a self-excited current-source inverter of 300 kVA is realized by using two self-excited current-source inverters of 150 kVA, if the self-excited current-source inverter is connected to the system in parallel, each of the self-excited current-source inverters is connected to the system. Although one DC reactor is required, when connected in series, a DC reactor device can be configured with one DC reactor. Moreover, since the value of the current flowing through the DC reactor can be reduced to half, the DC reactor can be downsized.

  Therefore, in the present invention, the DC reactor device is reduced in size and weight, and the transformer, the DC reactor device and the transformer can be compactly stored in the oil-filled storage case. Compared with the reactive power compensator, the size and weight of the reactive power compensator as a whole can be reduced.

  The storage locations of the n self-excited current source inverter circuits and the inverter control unit are arbitrary, but may be stored in an inverter case separate from the oil-filled storage case. In this case, the transformer, the DC reactor device and the transformer are electrically connected to the n self-excited current source inverter circuits and the inverter control unit via the connection terminals provided in the oil-filled storage case and the inverter case. What is necessary is just to make it connect.

  By providing the connection terminal of the oil-filled storage case on the top wall of the oil-filled storage case and the connection terminal of the inverter case on the bottom wall of the inverter case, the inverter case can be mounted on the oil-filled storage case. (Hereinafter referred to as “fixed integral type”). In this state, the oil-filled storage case and the inverter case can be mounted on a utility pole, and the reactive power compensator can be loaded on a single pole. In the case of the fixed integral type, the reactive power compensator is loaded in a state where it is biased to one side of the utility pole.

  Also, the connection terminal portion of the oil storage case was provided on the side wall of the oil storage case, the connection terminal portion of the inverter case was provided on the side wall of the inverter case, and the inverter case was mounted on the oil storage case. The connection terminals of the oil-filled storage case and the connection terminals of the inverter case may be electrically connected using a cable (hereinafter, referred to as a “separable integrated type”). In this way, by removing the cable, it is possible to lower only the inverter case, which houses components that are likely to need replacement as a result of the inspection, from the pole. As a result, maintainability is improved. Also, since the oil-filled storage case side is heavier than the inverter case side, in this configuration, when installing on a pole, first install the oil-filled storage case side and then And the inverter case can be placed and fixed on the side, and the installation work becomes easy. In order to allow only the inverter case to be hung, the inverter case is preferably provided with a hanging hook that can be used when hung by a crane.

  The oil-filled storage case and the inverter case may be separated from each other (hereinafter, referred to as a “separable type”). In this case, the reactive power compensator can be mounted on a single pole such that the oil-filled storage case and the inverter case face each other with the electric pole interposed therebetween, so that the weight balance is improved. As in the case of the conventional reactive power compensator, it is needless to say that it may be fixedly arranged on a scaffold that is passed between two electric poles.

  The reactive power compensator of the present invention can be installed on a pillar, on the ground, indoors, on the roof, under the ground, etc. (in this specification, collectively, in any of the fixed integrated type, the separable integrated type, and the separated type). Of course, it may be connected to the system in a state where it is fixedly arranged on the “ground”. Since the reactive power compensator of the present invention is smaller than the conventional one, it can be installed in a place where the installation space is limited.

  The arrangement of the equipment in the oil-filled storage case is arbitrary, but the transformer is installed at the bottom of the oil-filled storage case, and the transformer and DC reactor are installed side by side on the transformer. If this is the case, the equipment can be stored more compactly.

  The connection to the system is made via a plurality of bushings electrically connected to the primary side of the transformer, but the mounting position of this bushing is arbitrary. For example, a plurality of bushings may be provided on the side wall of the oil storage case. Providing a plurality of bushings in this manner facilitates connection with a high-voltage circuit breaker connected to the system.

  A plurality of (n) transformers may be provided according to the number (n) of self-excited current source inverter circuits. However, if the (n + 1) winding transformer is provided, the transformer may be provided. Since the size can be reduced, the reactive power compensator can be made more compact. For example, when two self-excited current source inverter circuits are provided as in the previous example, a three-winding transformer may be provided as the transformer.

  An inspection door will be provided on the side wall of the inverter case for inspection. In this case, the two self-excited current-source inverter circuits are preferably arranged along the side wall of the inverter case where the inspection door is not provided. With this configuration, components including a circuit board and the like that need to be inspected and replaced can be arranged in an area accessible from the inspection door, thereby facilitating the inspection. With this arrangement, it is possible to provide a cooling device (radiation fin or air cooling fan) outside the side wall of the inverter case for cooling the inverter.

  The reactive power compensator of the present invention is particularly remarkable when the rated compensation capacity for compensating for the reactive power of the system is 200 kVA or more. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to a reactive power compensator having a rated compensation capacity of about 100 kVA.

FIG. 2 is a circuit diagram of the reactive power compensator according to the first embodiment. (A) is a front view showing the inside of the reactive power compensator of the first embodiment in a see-through state, and (B) is a right side view. It is the schematic which showed the reactive power compensator of 1st Embodiment in the state which carried out single pillar loading. It is the schematic which showed the reactive power compensator of 2nd Embodiment in the state which carried out single pillar loading. It is the schematic which showed the state which installed the reactive power compensation apparatus of 3rd Embodiment on the ground. FIG. 14 is a schematic diagram illustrating a state in which the reactive power compensator according to the fourth embodiment is installed on the ground. It is a figure which shows arrangement | positioning of two self-excited current type inverter circuits in the case for inverters, and is the top view shown in the state which saw through the inside. It is a schematic diagram showing a reactive power compensator of a fifth embodiment. It is the schematic which shows the mode of the installation operation | movement at the time of mounting the single column mounting | wearing of the reactive power compensation apparatus of 5th Embodiment. It is the schematic which showed the reactive power compensator of 6th Embodiment in the state mounted | worn between two electric poles.

  Hereinafter, a reactive power compensator according to the present invention will be described in detail with reference to the drawings.

<First embodiment>
FIG. 1 is a circuit diagram of the reactive power compensator of the first embodiment. FIG. 2A is a front view showing the inside of the reactive power compensator of the first embodiment in a see-through state. FIG. 3B is a right side view, and FIG. 3 is a schematic view showing the reactive power compensator of the first embodiment loaded with a single pole. 2 (A) and 2 (B), cables for connecting each device are not shown for convenience of description, and FIG. 2 (B) is a case in which a perspective view is used for convenience. The members such as the cooling device 16 fixed to the wall surface, the high-pressure bushing 17, and a part of the fixture of the transformer 9 are omitted.

  The reactive power compensating device 1 is connected to the 6.6 kV system 2 to compensate for the reactive power of the system 2. A transformer (VCT) 9, an inverter control unit 11, a control box 12, an oil storage case 13, and an inverter case 15 are provided. The transformer 3 is a three-winding transformer, and has a primary side electrically connected to a system. The AC side of the self-excited current source inverter device 5 is connected to the secondary side of the transformer 3. The DC reactor device 7 is connected to the DC side of the self-excited current source inverter device 5. The transformer 9 is for detecting a voltage value and a current value of the system 2 and is composed of an instrument transformer 9A and an instrument current transformer 9B. And is connected to a device in the control box 12. The control box 12 accommodates equipment for performing various settings and control of the reactive power compensating device 1 such as a pole high voltage circuit breaker to be described later. As shown in FIG. They are arranged separately. The devices in the control box 12 are also connected to the inverter control unit 11 and output the voltage value and the current value obtained by the transformer 9 to the inverter control unit 11. The inverter control unit 11 outputs a control signal for controlling the self-excited current source inverter device 5 based on the voltage value and the current value.

  As shown in FIGS. 2 (A) and 2 (B), the oil-filled storage case 13 has a rectangular parallelepiped shape formed by processing an iron plate, stores each device, and closes an iron lid in a state filled with insulating oil. The upper wall 13A is closed and sealed. The transformer 3, the DC reactor 7, and the transformer 9 (instrument transformers 9A and 9B) are accommodated in the oil-filled storage case 13 together with the insulating oil 10. As a result, the insulation distance of each device can be reduced, and the device can be compactly stored in the oil-filled storage case 13. The heavy transformer 3 is arranged at the bottom of the oil-filled storage case 13, and the transformer 9 and the DC reactor 7 are installed side by side on the transformer 3. Since the DC reactor device 7 used in the present embodiment is small, it can be installed on the transformer 3. Further, the DC reactor device 7 on the transformer 3 and the instrument transformer 9A and the current transformer for instrument 9B are arranged in a space-saving manner in consideration of the insulation distance. A plurality of lateral high-pressure bushings 17 electrically connected to the primary side of the transformer 3 are provided on a side wall 13B of the oil-filled storage case 13. A connection terminal portion 19 (DC side connection terminal portion 19A and AC side connection terminal portion 19B) connected to the inverter case 15 is provided on an upper wall 13A of the oil-filled storage case 13. The oil level of the insulating oil 10 is near the high-pressure bushing 17 as shown by the broken lines in FIGS. 2 (A) and 2 (B).

  The self-excited current source inverter device 5 is composed of two self-excited current source inverter circuits 21A and 21B whose DC side is connected in series. Each of the self-excited current-source inverter circuits 21A and 21B is 150 kVA, and the self-excited current-source inverter device 5 has a rated compensation capacity of 300 kVA by connecting the DC side in series. DC reactor device 7 includes one DC reactor 23 connected in series to self-excited current source inverter circuits 21A and 21B. With this configuration, the withstand voltage of each element (IGBT) constituting the self-excited current-source inverter circuits 21A and 21B is reduced to half of that in the case where the number of self-excited current-source inverter circuits is one. be able to. Further, the DC reactor device 7 can be configured with one DC reactor, and the value of the current flowing through one DC reactor can be reduced to half.

  As shown in FIGS. 2A and 2B, a self-excited current source inverter circuit 21A, 21B and an inverter control unit 11 are housed in the inverter case 15. A connection terminal 25 (DC side connection terminal 25A and AC side connection terminal 25B) connected to oil storage case 13 is provided on bottom wall 15A of inverter case 15. Outside the inverter case 15, a cooling device 16 (air cooling fan) for cooling the heat generated by the self-excited current source inverter circuits 21A and 21B is provided.

  The arrangement of the self-excited current source inverter circuits 21A and 21B is not limited to the arrangement shown in FIGS. For example, when the inspection door AD is provided on the side wall of the inverter case, as shown in FIG. 7, the inspection door AD is preferably arranged along the side wall portion of the side wall of the inverter case where the inspection door AD is not provided. preferable. In this way, components including circuit boards and the like that need to be inspected and replaced can be arranged in an area accessible from the inspection door AD, and inspection can be facilitated. Further, for cooling the inverter, the cooling device 16 can be provided outside the side wall of the inverter case.

In the present embodiment, the inverter case 15 is fixed on the oil-filled storage case 13, and the connection terminal portion 19 on the oil-filled storage case 13 side is connected to the connection terminal portion 25 on the inverter case 15 side. Thus, the fixed-integral reactive power compensator 1 is configured. With the above configuration, the reactive power compensator 1 of the present embodiment has achieved a reduction in size and weight of 2 m ³ in volume and 2.3 t in weight. With this configuration, as shown in FIG. 3, in the reactive power compensator 1, the oil-filled storage case 13 and the inverter case 15 are mounted on the electric pole 27 by the fixing fitting 29, and the electric pole 27 is loaded (single pole). Mounting). The high-voltage bushing 17 is connected to the pole high voltage circuit breaker 31 connected to the system 2, and the reactive power compensator 1 is connected to the system 2 via the pole high voltage circuit breaker 31.

<Second embodiment>
FIG. 4 is a schematic diagram illustrating a reactive power compensator according to the second embodiment in a state where a single column is loaded. FIG. 4 is a front view showing the inside of the reactive power compensator in a see-through state, similarly to FIG. 2 (A), and the internal cables and control box connecting each device are omitted from the drawing. I have. In FIG. 4, the same members as those in the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. Is omitted.

In the second embodiment, the reactive power compensator 101 is configured as a separate type in which the oil-filled storage case 113 and the inverter case 115 are separated. With this configuration, the reactive power compensator 101 of the present embodiment achieves a reduction in size and weight of 2.4 m ³ and a weight of 2.7 t, and the oil-filled storage case 113 and the inverter The reactive power compensator 101 is loaded on the utility pole 127 so that the case 115 is opposed to the utility pole 127 and is fixed to the utility pole 127 with a fixture 129.

  The connection terminal portion 119 on the oil-filled storage case 113 side and the connection terminal portion 125 on the inverter case 115 side are provided on opposing walls 113C and 115B, respectively, and are electrically connected to each other by cables. ing. In the separation type, since the oil-filled storage case 113 and the inverter case 115 can be arranged with the electric pole 127 interposed therebetween, there is an effect that the weight balance is improved.

<Third embodiment>
FIG. 5 is a schematic diagram showing a state in which the reactive power compensator of the third embodiment is installed on the ground. FIG. 5 is a front view showing the inside of the reactive power compensator in a see-through state, similarly to FIG. 2 (A), and the illustration of internal cables connecting each device is omitted. In FIG. 5, the same members as those of the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. Is omitted.

  The reactive power compensator 201 of the third embodiment is a fixed integral type in which an inverter case 215 is fixed on an oil-filled storage case 213, as in the first embodiment. The reactive power compensator 201 according to the third embodiment is installed on the ground, and is cable-connected to a high-voltage line 237 connected to the system 203 via a high-voltage switch 235. By using the reactive power compensator 201 of the present embodiment, the reactive power compensator can be installed even in a place where the installation space is limited.

<Fourth embodiment>
FIG. 6 is a schematic diagram showing a state in which the reactive power compensator of the fourth embodiment is installed on the ground. FIG. 6 is a front view showing the inside of the reactive power compensator in a see-through state, similarly to FIG. 2 (A), and the illustration of internal cables connecting each device is omitted. In FIG. 6, the same members as those of the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. Are omitted, and the same members as those of the embodiment shown in FIG. 4 are denoted by the same reference numerals as those in FIG.

  The reactive power compensator 301 according to the fourth embodiment is a separation type in which the oil-filled storage case 313 and the inverter case 315 are separated from each other, as in the second embodiment. The reactive power compensator 301 according to the fourth embodiment is installed on the ground, and is cable-connected to a high-voltage line 337 connected to the system 303 via a high-voltage switch 335.

<Fifth embodiment>
FIG. 8 is a schematic diagram showing a reactive power compensator of the fifth embodiment, and FIG. 9 is a diagram showing a state of a replacement work on the inverter case side of the reactive power compensator. 8 and 9, the same members as those of the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. And the description is omitted.

  In the reactive power compensator 401 according to the fifth embodiment, the connection terminal 419 is provided on the side wall 413C of the oil storage case 413, and the connection terminal 425 is provided on the side wall 415C of the inverter case 415. The inverter case 415 is mounted on the oil-filled storage case 413 and is fixed with fixing brackets. The connection terminal 419 and the connection terminal 425 are electrically connected using a cable. With such a configuration, the reactive power compensator 401 is of a separable integral type that can easily separate the oil-filled storage case 413 side and the inverter case 415 side. It is possible to lower only the inverter case 413 in which components having a high possibility of being stored are stored from the pole. When lowering the inverter case 415, the inverter case 415 is hung by a crane using the hanging hooks 439 provided on the upper wall 415D of the inverter case 415 (see FIG. 9). In addition, since the oil-containing storage case 413 side is heavier than the inverter case 415 side, in this configuration, when installing on the pillar, first install the oil-containing storage case 413 side. It is also possible to mount the inverter case 415 thereon.

  In use, a protective cover PC is attached so as to cover the connection terminal portions 419 and 425.

<Sixth Embodiment>
FIG. 10 is a schematic diagram illustrating a reactive power compensator according to the sixth embodiment, and is a diagram illustrating a state where the reactive power compensator is mounted between two power poles. In FIG. 10, the same members as those of the embodiment shown in FIGS. 1 to 3 are denoted by reference numerals obtained by adding 500 to the reference numerals given in FIGS. I do.

  The reactive power compensating device 501 of the sixth embodiment is a separation type in which the oil-filled storage case 513 and the inverter case 515 are separated, as in the second and fourth embodiments. The reactive power compensator 501 of the present embodiment is mounted between two utility poles, similarly to a conventional reactive power compensator. In this case, the high-pressure bushing 517 connected to the system 502 is provided on the upper wall of the oil-containing storage case 513.

  Although the embodiments of the present invention have been specifically described above, the present invention is not limited to these embodiments, and it is needless to say that changes can be made within the technical idea of the present invention. It is. For example, a self-excited current-source inverter device can be composed of three or more self-excited current-source inverter circuits.

  According to the present invention, the DC reactor device is reduced in size and weight, and each device can be compactly stored in the oil-filled storage case. The overall size and weight of the compensator can be reduced.

REFERENCE SIGNS LIST 1 Reactive power compensator 2 System 3 Transformer 5 Self-excited current source inverter 7 DC reactor 9 Transformer 9A Instrument transformer 9B Instrument current transformer 10 Insulating oil 11 Inverter control unit 12 Control box 13 Oil storage case 15 Inverter case 16 Cooling device 17 High-pressure bushing 19 (oil-filled storage case side) Connection terminal portions 21A, 21B Self-excited current source inverter circuit 23 DC reactor 25 (Inverter case side) Connection terminal portion 27 Power pole 29 Fixing bracket 31 Column Upper high-voltage circuit breaker

Claims (15)

A reactive power compensator that compensate for reactive power of the system,
A transformer whose primary side is connected to the system,
A self-excited current source inverter device whose AC side is connected to the secondary side of the transformer,
A DC reactor device connected to the DC side of the self-excited current source inverter device,
A transformer for detecting a voltage value and a current value of the system,
An inverter control unit that outputs a control signal for controlling the plurality of self-excited current source inverter devices based on the voltage value and the current value;
At least the transformer, the DC reactor device and an oil-containing storage case that stores the transformer together with insulating oil,
The self-excited current-source inverter device is composed of n (n is an integer of 2 or more) self-excited current-source inverter circuits whose DC side is connected in series,
The DC reactor device includes one DC reactor connected in series to the n self-excited current source inverter circuits connected in series,
The n self-excited current source inverter circuits and the inverter control unit are housed in an inverter case separate from the oil-filled storage case,
The transformer, the DC reactor device, and the transformer are connected to the n self-excited current source inverter circuits and the inverter control unit via connection terminals provided in the oil-filled storage case and the inverter case. Is electrically connected to
The connection terminal portion of the oil-filled storage case is provided on an upper wall of the oil-filled storage case,
The connection terminal portion of the inverter case is provided on a bottom wall of the inverter case,
The inverter case is fixed on the oil-containing storage case,
A reactive power compensator, wherein the oil-filled storage case and the inverter case are mounted on a utility pole in a state of being mounted on the utility pole , respectively . A reactive power compensator for compensating reactive power of a system,
A transformer whose primary side is connected to the system,
A self-excited current source inverter device whose AC side is connected to the secondary side of the transformer,
A DC reactor device connected to the DC side of the self-excited current source inverter device,
A transformer for detecting a voltage value and a current value of the system,
An inverter control unit that outputs a control signal for controlling the self-excited current source inverter device based on the voltage value and the current value;
At least the transformer, the DC reactor device and an oil-containing storage case that stores the transformer together with insulating oil,
The self-excited current source inverter device includes two self-excited current source inverter circuits whose DC sides are connected in series,
The DC reactor apparatus, Ri Do from one DC reactor connected in series to said two self-exciting current source inverter circuits connected in series,
The two self-excited current source inverter circuits and the inverter control unit are housed in an inverter case separate from the oil-filled storage case,
An inspection door is provided on a side wall of the inverter case,
The self-exciting current source inverter circuit of two are reactive power compensator, wherein Rukoto the inspection doors of the side wall of the case for the inverter are disposed along the side wall portion is not provided. Before Symbol transformer, the DC reactor device and the transformer, the oil-filled housing case and via the connecting terminals provided on the case for the inverter, the two self-exciting current source inverter circuit and the inverter control The reactive power compensator according to claim 2, wherein the reactive power compensator is electrically connected to the unit. The connection terminal portion of the oil-filled storage case is provided on an upper wall of the oil-filled storage case,
The connection terminal portion of the inverter case is provided on a bottom wall of the inverter case,
The reactive power compensator according to claim 3, wherein the inverter case is fixed on the oil-filled storage case.   The reactive power compensator according to claim 4, wherein the oil-filled storage case and the inverter case are mounted on a utility pole while being mounted on the utility pole. The connection terminal portion of the oil-filled storage case is provided on a side wall of the oil-filled storage case,
The connection terminal portion of the inverter case is provided on a side wall of the inverter case,
The inverter case is fixed while being placed on the oil-filled storage case,
4. The reactive power compensator according to claim 3, wherein the connection terminal portion of the oil-filled storage case and the connection terminal portion of the inverter case are electrically connected using a cable. 5.   The reactive power compensator according to claim 6, wherein the inverter case is provided with a hanging hook that can be used when the inverter is hung by a crane.   4. The reactive power compensator according to claim 3, wherein the oil-filled storage case and the inverter case are mounted on a utility pole so as to face each other with a utility pole therebetween. 5.   The reactive power compensator according to claim 3, wherein the reactive power compensator is connected to the system while being fixedly arranged on the ground.   The reactive power compensator according to claim 3, wherein the oil-filled storage case and the inverter case are connected to the system while being fixedly arranged on the ground.   4. The invalidation according to claim 3, wherein the oil-filled storage case and the inverter case are connected to the system in a state where the oil-filled storage case and the inverter case are fixedly arranged on a scaffold passed between two electric poles. 5. Power compensator. The transformer is installed at a bottom portion in the oil storage case,
The reactive power compensator according to claim 2, wherein the transformer and the DC reactor device are installed side by side on the transformer. A plurality of bushings electrically connected to a primary side of the transformer are provided on a side wall of the oil-filled storage case,
The reactive power compensator according to claim 2, wherein the plurality of bushings are electrically connected to a high voltage circuit breaker connected to the system. Before Symbol transformer, reactive power compensator according to claim 2 which is 3-winding transformer. The reactive power compensator according to claim 2, wherein the rated compensation capacity for compensating for the reactive power of the system is 200 kVA or more.

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