JP6861083B2 - Static power compensator using power converter and power converter - Google Patents

Description

The present invention relates to a power conversion device having high heat dissipation performance used in a power device such as a static power compensator.

In Japanese Patent Application Laid-Open No. 63-30231 (Patent Document 1), Japanese Patent Application Laid-Open No. 3-122596 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2004-356130 (Patent Document 3), power conversion elements constituting an inverter with a blower are described. A conventional power conversion device that forcibly dissipates heat from a power source is disclosed.

Further, in Japanese Patent Application Laid-Open No. 9-307038 (Patent Document 4), a plurality of modules having a heat sink equipped with a power conversion element are arranged inside a wind guide (wind tunnel) at intervals in the vertical direction, and each module. There is disclosed a power conversion device in which the air-cooling performance is improved by inclining the air-cooling device in the horizontal direction.

Jikken Sho 63-30231 Jikkenhei 3-122596 Gazette Japanese Unexamined Patent Publication No. 2004-356130 Japanese Unexamined Patent Publication No. 9-307038

Even if the conventional air-cooling technology of the power conversion device disclosed in Patent Documents 1 to 4 is combined, the forced air-cooling device is provided with a plurality of heat sinks for cooling the plurality of power conversion elements included in the inverter circuits of the plurality of inverter devices. When air-cooled by using, there is a problem that it is not possible to obtain a structure capable of evenly cooling each heat sink by effectively utilizing each forced air-cooling device.

An object of the present invention is to provide a power conversion device having high heat dissipation performance so that the cooling devices provided in a plurality of inverter devices can be utilized as effectively as possible.

Another object of the present invention is to provide a static power compensator with enhanced heat dissipation performance of the power conversion device.

The present invention includes n inverter devices (n is an integer of 2 or more) each equipped with a cooling device, an inverter control unit that controls a plurality of power conversion elements included in each of the inverter circuits of the n inverter devices. The target is a power conversion device including a mounting portion for mounting a plurality of power conversion elements of n cooling devices of n inverter devices and an inverter case in which at least an inverter control unit is housed.

In the power conversion device of the present invention, n cooling devices of n inverter devices are provided with a heat sink having a mounting portion and a plurality of blowers arranged along the heat sink so as to blow air for air cooling to the heat sink. It has a forced air cooling device. The side wall of the inverter case is provided with a plurality of intake ports and a plurality of exhaust ports for n cooling devices arranged side by side in the vertical or horizontal direction, and a mounting portion of n cooling devices is provided inside. There is a wind tunnel that houses the main parts except. Inside this wind tunnel, between two adjacent cooling devices arranged side by side in the vertical or horizontal direction, there is a shielding plate that blocks the exhaust from one cooling device from directly hitting the other cooling device. Each is arranged. This shielding plate is configured to diagonally partition the space between one cooling device and the other cooling device, with an intake port for the other cooling device and an exhaust port for one cooling device. Are provided at positions facing each other via a shielding plate. Moreover, the distance between the shielding plate and the other cooling device decreases toward the back from the intake port, and the distance between the shielding plate and one cooling device decreases toward the back from the exhaust port. The positional relationship between the two cooling devices adjacent to each other is defined.

According to the present invention, when a forced cooling device including a plurality of blowers for cooling a heat sink is provided in each of n cooling devices, exhaust from one cooling device is provided between two adjacent cooling devices. Since a shielding plate is provided to prevent the heat sink from directly hitting the other cooling device, the heat sink can be forcibly air-cooled without being affected by the exhaust heat from the other cooling devices. Moreover, a shielding plate is configured to diagonally partition the space between one cooling device and the other cooling device, with an intake port for one cooling device and an exhaust port for the other cooling device. It is provided at a position facing each other via a shield plate, and the distance between the shield plate and one cooling device becomes smaller toward the back from the intake port, and the distance between the shield plate and the other becomes smaller toward the back from the exhaust port. Since the positional relationship between the shielding plate and the two adjacent cooling devices is determined so that the distance between the two cooling devices is small, exhaust from other cooling devices can be generated between the two adjacent cooling devices. , It is possible to prevent the situation where the air is taken in from the intake port of one of the cooling devices. Further, depending on how the shielding plate is tilted, it is possible to secure the amount of air blown from a plurality of blowers required for cooling the heat sink without increasing the distance between the two cooling devices.

The n intake ports for the n cooling devices are open on one side surface that does not face the side wall of the inverter case of the wind tunnel, and the n exhaust ports for the n cooling devices are open. It is preferable to open to one side surface of the wind tunnel and the other side surface facing the wind tunnel. In this way, even when n cooling devices are used, it is possible to prevent the exhausted air from being directly sucked as the intake air.

When n cooling devices are arranged vertically, an additional intake port for the cooling device located at the bottom may be provided at the bottom of the wind tunnel. This structure exerts an effect that the amount of intake air can be increased by effectively utilizing the additional intake port, particularly when the power conversion device is installed in a state of floating from the installation surface.

When n cooling devices are arranged in the vertical direction, an additional exhaust port for the cooling device located at the top may be provided at the upper part of the wind tunnel. This structure exerts an effect that the exhaust amount can be increased by effectively utilizing the additional exhaust port, particularly when there is no restriction on the use of the space above the power conversion device.

The shield may be provided with a non-inclined portion closer to the exhaust port for the other cooling device in which the spacing dimension from the corresponding cooling device does not change over a predetermined length in the direction in which the plurality of blowers are lined up. .. The non-sloping part does not have to be completely horizontal as long as it is not generally slanted. When such a non-tilted portion is provided, the distance between the non-tilted portion and the cooling device facing the non-tilted portion can be maintained substantially constant. Therefore, when viewed from the intake port side, it is possible to secure a large space near the suction port of the blower located in the back, and it is possible to prevent a significant decrease in the air volume. When viewed from the exhaust port side, even if the distance between the non-sloping portion and the cooling device facing the outlet is almost constant near the outlet portion, the resistance of the exhaust flow path is not significantly increased, so that the displacement of the exhaust amount is increased. Does not cause a drop.

The shielding plate preferably has a multi-layer structure having one or more heat insulating layers in the intermediate layer. When a multilayer structure having such a heat insulating layer is used, the heat insulating performance between two adjacent cooling devices can be improved.

Further, when n cooling devices are arranged in the vertical direction, a heat sink having a structure extending in the horizontal direction orthogonal to the vertical direction and having a structure in which the heat transfer fluid circulates inside should be used. Can be done. In this case, the space between the plurality of blowers and the corresponding heat sinks is preferably partitioned by a plurality of partition walls so as to form individual flow paths for each of the plurality of blowers. If such a partition wall is provided, when one or more blowers out of a plurality of blowers stop due to a failure, the blower that has stopped blowing from a sound blower is rotated to generate a backflow. Can be prevented. Even if such a partition wall is provided, the heat sink is not cooled only partially, and the heat transfer fluid in the heat sink flows through the entire heat sink, and as a result, the heat sink is entirely cooled.

With the panel forming the side surface of the wind tunnel facing the side wall of the inverter case removed, a plurality of blowers of the forced air cooling device may be supported by a drawer support structure so that the panel can be pulled out to the side where the panel is located. .. Adopting such a structure facilitates replacement of a failed blower.

Inside the inverter case, there is a heat exchanger that exchanges heat with the outside air to lower the temperature inside the inverter case, and the inverter to bring the air inside the inverter case into contact with the heat exchanger. An air circulation device that circulates air in the case may be arranged. In this way, the inside of the inverter case can be sealed, so that the inverter device can be completely dustproof and waterproof.

In the inverter case, an inverter circuit including a plurality of power conversion elements mounted on the mounting portions of n cooling devices and a control unit are spaced apart so as to form an air circulation path between them. It is preferably arranged. In this way, when the inside of the inverter case is sealed, a part of the heat generated from the power conversion element is prevented from staying locally in the inverter case, and it is generated due to the temperature rise. It is possible to prevent the occurrence of malfunction of the circuit or electronic component.

The power conversion device of the present invention can be used as a static power compensator for compensating for the static power of the system.

When the power conversion device of the present invention is used as an ineffective power compensating device for compensating for the inactive power of the system, the ineffective power compensating device detects the voltage value and the current value of the transformer and the system in which at least the primary side is connected to the system. When the transformer is stored in the oil-filled storage case together with the insulating oil, the inverter case is arranged so that the exhaust port provided in the air cavity blows the exhaust air to the outer surface of the oil-filled storage case. Is preferable. Even if the exhaust from the power converter hits the oil-filled storage case, the heat capacity of the oil-filled storage case is large, so there is almost no effect on the temperature rise of the oil-filled storage case. According to this arrangement, when the outside wind is strong, the oil-filled storage case has an effect of functioning as a protective wall to prevent the strong wind from directly hitting the exhaust port.

It is a circuit diagram of the static power compensator in which the power conversion device of this invention is used. (A) to (C) are a front view, a plan view, and a left side view of the appearance of the static VAR compensator of the embodiment. (A) is a schematic view of the inside of the static VAR compensator of the first embodiment loaded on two utility poles, and FIG. 3 (B) is an embodiment loaded on two utility poles. It is a figure which shows the outline of the mounting state of the static power compensator of. It is the schematic which shows the arrangement structure inside the case for the inverter of the static power compensator of embodiment. It is the schematic which shows the structure of the cooling structure. (A) is a conceptual diagram for explaining the structure of the cooling device, and (B) is a diagram for explaining a phenomenon that occurs when there is no partition wall. (A) to (C) are diagrams showing a modified example of a cooling structure when a plurality of cooling devices are arranged in the vertical direction. (A) and (B) are diagrams showing a modified example of a cooling structure when a plurality of cooling devices are arranged in the lateral direction. It is a figure which shows the structure in the case of loading a static VAR compensator on one utility pole.

Hereinafter, embodiments of the power conversion device of the present invention having high heat dissipation performance used in a power device such as an ineffective power compensation device will be described in detail with reference to the drawings.

[Configuration of static VAR compensator]
FIG. 1 is a circuit diagram of a static power compensator in which the power conversion device of the present invention is used, and FIGS. 2 (A) to 2 (C) are a front view and a plan view of the appearance of the static VAR compensator according to the embodiment. It is a figure and the left side view. FIG. 3A is a schematic view of the inside of the static VAR compensator of the first embodiment loaded on two utility poles, and FIG. 3B is an implementation in which the two utility poles are loaded. It is a figure which shows the outline of the mounting state of the static power compensator of the form of. FIG. 4 is a schematic view showing an internal arrangement configuration of an inverter case of the static VAR compensator of the embodiment. In FIGS. 3 (A) and 3 (B) and FIG. 4, for convenience of explanation, the cables connecting each device are not shown, and the high-voltage bushing, the transformer fixture, and other parts are omitted. Fixtures are omitted. Further, in (A) and (B) and FIG. 4, the size and arrangement position of each component are different for convenience from the relationship shown in the drawing.

As shown in FIGS. 1 to 4, 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, and includes a transformer 3, a power converter 5, and the like. It includes a DC reactor device 7, a transformer (VCT) 9, an inverter control unit 11, a control unit 12, an oil-filled storage case 13, and an inverter case 15. The transformer 3 is a three-winding transformer, and the primary side is electrically connected to the system. The power converter 5 has an AC side connected to the secondary side of the transformer 3. The DC reactor device 7 is connected to the DC side of the power converter 5. The transformer 9 is for detecting the voltage value and the current value of the system 2, and is composed of an instrument transformer 9A and an instrument transformer 9B, and includes a transformer 3 and a high-voltage bushing described later. It is connected between the two and is connected to the device in the control unit 12. The control unit 12 contains devices for performing various settings and controls of the static VAR compensator 1 such as a pillar-mounted high-voltage circuit breaker, which will be described later. It is arranged separately. The equipment in the control unit 12 is also connected to the inverter control unit 11, and outputs 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 power converter 5 based on the voltage value and the current value. In FIGS. 2 to 4, the inverter control unit 11 is not shown because it is built in the control unit 12.

As shown in FIGS. 2A to 2C, the oil-filled storage case 13 has a rectangular parallelepiped shape formed by processing an iron plate, and has an iron lid in which each device is stored and filled with insulating oil. The upper wall that constitutes the building is closed and sealed. The transformer 3, the DC reactor device 7, and the transformer 9 (instrument transformer 9A and instrument transformer 9B) are housed together with insulating oil in the oil-filled storage case 13. As a result, the insulation distance of each device can be shortened, and each 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 device 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, and the DC reactor device 7 is arranged sideways. Further, in the present embodiment, the DC reactor device 7 on the transformer 3, the instrument transformer 9A, and the instrument transformer 9B are arranged in a space-saving manner in consideration of the insulation distance. The upper wall 13B of the oil-filled storage case 13 is provided with three high-voltage bushings 17 electrically connected to the primary side of the transformer 3. A connecting portion 19 for connecting to the inverter case 15 is provided on the side wall 13A of the oil-filled storage case 13.

The power converter 5 is composed of two inverter devices 5A and 5B including two self-excited current inverter circuits 21A and 21B, each of which is connected in series on the DC side. In FIG. 1, in order to simplify the illustration, the notation "inverter" is used as a representative notation for the inverter device and the self-excited current type inverter circuit. The self-excited current type inverter circuits 21A and 21B are each 150 kVA, and the power converter 5 has a rated compensation capacity of 300 kVA by connecting the DC side in series. The DC reactor device 7 includes one DC reactor 23 connected in series to the self-excited current type inverter circuits 21A and 21B. With this configuration, the withstand voltage of each element (IGBT) constituting the self-excited current-type inverter circuits 21A and 21B is reduced to 1/2 as compared with the case where one self-excited current-type inverter circuit is used. be able to. Further, the DC reactor device 7 can be configured by one DC reactor, and the current value flowing through one DC reactor can be reduced to 1/2.

As shown in FIGS. 2 (A) to 2 (C), FIGS. 3 (A) and 4, the self-excited current type inverter circuits 21A and 21B and the inverter control unit 11 are housed in the inverter case 15. The control unit 12 is arranged. The side wall 15A of the inverter case 15 is provided with a wind tunnel 16 having two cooling devices 30A and 30B for cooling the heat generated by the self-excited current type inverter circuits 21A and 21B. The details of the cooling devices 30A and 30B will be described later.

Further, as shown in FIGS. 2 (A) to 2 (C) and FIGS. 3 (A) and 4, the inspection door 18 of the inverter case 15 is provided with outside air and heat in order to lower the temperature inside the inverter case 15. Heat exchangers 20A and 20B for replacement are installed. Further, in the inverter case 15, an air circulation device 22 that circulates air in the inverter case 15 in order to bring the air in the inverter case 15 into contact with the heat exchangers 20A and 20B [FIG. 3 (A)). And FIG. 4] are arranged. This air flow is the flow path indicated by the broken line indicated by the reference numeral FP in FIGS. 2 (C) and 4. Specifically, the inverter circuit including the plurality of power conversion elements mounted on the mounting portions 31a and 31b of the two cooling devices 30A and 30B and the control unit form an air circulation path between them. They are arranged at intervals. In this way, when the inside of the inverter case 15 is sealed, a part of the heat generated from the power conversion element is prevented from staying locally in the inverter case, and it is generated due to the temperature rise. It is possible to prevent the occurrence of malfunction of the circuit or electronic component.

In this way, the inside of the inverter case 15 can be sealed, so that the power converter 5 can be completely dustproof and waterproof.

The static VAR compensator 1 of the present embodiment is a separate type in which the oil-filled storage case 13 and the inverter case 15 are separated. The static VAR compensator 1 of the present embodiment is mounted between two utility poles 27, 27. The high-voltage bushing 17 is connected to the pole high-voltage circuit breaker 31 connected to the system 2, and the static VAR compensator 1 is connected to the system 2 via the pole high-voltage circuit breaker 31.

[Cooling structure 1]
In the power conversion device of the present embodiment, a plurality of inverter devices 5A and 5B provided with cooling devices 30A and 30B and a plurality of inverter circuits 21A and 21B of the two inverter devices 5A and 5B, respectively. A control unit 12 including an inverter control unit 11 for controlling a power conversion element, and a mounting portion 31a of heat sinks 31A and 31B for mounting a plurality of power conversion elements (not shown) of the cooling devices 30A and 30B of the two inverter devices 5A and 5B. And 31b are stored at least.

In the power conversion device of the present embodiment, as shown in FIGS. 4 and 5, two cooling devices 30A and 30B of the two inverter devices 5A and 5B have a heat sink 31A and a heat sink 31A having mounting portions 31a and 31b, respectively. It has forced air cooling devices 32A and 32B provided with a plurality of blowers (FIG. 6) arranged along the heat sinks 31A and 31B so as to blow air cooling air onto the heat sinks 31B and the heat sinks 31A and 31B. As the blower, an axial blower can be mainly used, but it goes without saying that a centrifugal blower, a mixed flow blower, or the like may be used as the blower.

Then, as shown in FIG. 5, in the wind tunnel 16 provided on the side wall 15A of the inverter case 15, the intake ports IN1, IN21 and IN22 for the two cooling devices 30A and 30B arranged side by side in the vertical direction are provided. And exhaust ports OUT11, OUT2 and OUT12. The intake ports IN1, IN21 and IN22 and the exhaust ports OUT11, OUT2 and OUT12 are covered with a net to prevent the invasion of birds. Note that, in FIG. 5, these intake ports and exhaust ports are not positively shown for the sake of simplification.

Inside the wind tunnel 16, main parts (31A to 32B) other than the mounting parts 31a and 31b of the heat sinks 31A and 31B of the two cooling devices 30A and 30B are housed. Inside the wind tunnel 16, the exhaust gas from one cooling device 30B directly hits the other cooling device 30A between two adjacent cooling devices 30A and the cooling devices 30B arranged side by side in the vertical direction. A shielding plate 33 is arranged to block the air. The shielding plate 33 is configured to diagonally partition the space portion S between one cooling device 30B and the other cooling device 30A, and is an intake port IN1 for the other cooling device 30A and one cooling device. The exhaust port OUT2 for 30B is provided at a position facing the exhaust port OUT2 via the shielding plate 33. Moreover, the distance between the shielding plate 33 and the other cooling device 30A becomes smaller toward the back from the intake port IN1, and the distance between the shielding plate 33 and one cooling device 30B becomes smaller toward the back from the exhaust port OUT2. The positional relationship between the two cooling devices 30A and 30B adjacent to the shielding plate 33 is defined so as to be smaller.

The distance between the shielding plate 33 and the corresponding cooling device 30A is predetermined in the direction in which a plurality of blowers in the forced air cooling device 32A of the cooling device 30A are lined up (in the case of FIG. 5, the left-right direction of the paper surface). A non-inclined portion 33A that does not change over the length is provided near the exhaust port OUT2 for the other cooling device setting 30B located on the lower side. The non-tilted portion 33A need not be completely horizontal as long as it is not substantially tilted. When such a non-tilted portion 33A is provided, the distance between the non-tilted portion 33A and the cooling device 30A facing the non-tilted portion 33A can be maintained substantially constant, so that when viewed from the intake port IN1 side for the cooling device 30A. It is possible to secure a large space near the suction port of the blower located at the back of the forced cooling device 32A, and it is possible to prevent a significant decrease in the air volume of the blower located at the back. When viewed from the exhaust port OUT11 side, even if the distance between the non-inclined portion 33A and the forced air cooling device 32A facing the outlet portion is almost constant, the resistance of the exhaust flow path is not significantly increased. Therefore, it does not cause a decrease in the displacement.

The shielding plate 33 of the present embodiment has a multi-layer structure having one or more heat insulating layers 34 in the intermediate layer. Styrofoam, glass fiber, or the like can be used as the heat insulating material constituting the heat insulating layer 34, but the heat insulating layer 34 may be formed by a simple layer of air. When a multilayer structure having a heat insulating layer 34 is used for the shielding plate 33, the heat insulating performance between two adjacent cooling devices 30A and 30B can be improved.

In the present embodiment, when the two cooling devices 30A and 30B are arranged in the vertical direction and the ineffective power compensating device 1 is installed separated from the ground, it is located at the bottom 16A of the wind tunnel 16. , An additional intake port IN22 is provided for the cooling device 30B located below. In this structure, the additional intake port IN22 can be effectively utilized to increase the intake amount.

Further, in the present embodiment, the two intake ports IN1 and IN21 for the two cooling devices 30A and 30B are opened on one side surface 16C which does not face the side wall 15A of the inverter case 15 of the wind tunnel 16, respectively. The two exhaust ports OUT11 and OUT2 for the two cooling devices 30A and 30B are open to one side surface 16C of the wind tunnel 16 and the other side surface 16D facing the side surface 16C. Further, in the present embodiment, when the two cooling devices 30A and 30B are arranged in the vertical direction, an additional exhaust port OUT12 for the cooling device 30A located above is provided in the upper portion 16B of the wind tunnel 16. There is. In this way, even when two cooling devices 30A and 30B are used, it is possible to prevent the exhausted air from being directly sucked as the intake air. Further, according to the embodiment, since there is no limitation on the use of the space above the power conversion device 1, the additional exhaust port OUT12 can be effectively utilized to increase the displacement.

When such a configuration is adopted, when the two cooling devices 32A and 32B are provided with the forced air cooling devices 32A and 32B provided with a plurality of blowers for cooling the heat sinks 31A and 31B, respectively, the two adjacent cooling devices are cooled. Since a heat sink 33 is provided between the devices 30A and 30B to prevent the exhaust from one cooling device 30B from directly hitting the other cooling device 30A, each cooling device is provided with a heat sink for exhaust heat from the other cooling device. Forced air cooling of the heat sinks 31A and 31B can be performed without being affected.

With the panel constituting the side surface 16E [FIG. 2 (A)] of the wind tunnel 16 facing the side wall 15A (FIG. 4) of the inverter case 13 removed, the forced cooling devices 32A and 32B of the cooling devices 30A and 30B , It is preferable that the panel 16E is supported by a pull-out support structure so that it can be pulled out to the side where the panel 16E is located. Adopting such a structure facilitates replacement of a failed blower.

In the present embodiment, as shown in FIG. 2B, the inverter case 15 is arranged so that the exhaust ports OUT1, OUT11, and OUT2 provided in the wind tunnel 16 apply the exhaust air to the outer surface of the oil-filled storage case 13. ing. Even if the exhaust gas from the wind tunnel 16 hits the oil-filled storage case 13, the heat capacity of the oil-filled storage case 13 is large, so that the temperature rise of the oil-filled storage case 13 is hardly affected. According to this arrangement, when the outside wind is strong, the oil-filled storage case 13 functions as a protective wall to prevent the strong wind from directly hitting the exhaust ports OUT1, OUT11, and OUT2.

[Cooling device structure]
FIG. 6A is a conceptual diagram for explaining the structure of the cooling device adopted in the present embodiment. In the present embodiment, when two cooling devices 30A (30B) are arranged in the vertical direction, the heat sink 31A (31B) extends in the horizontal direction orthogonal to the vertical direction, and the heat transfer fluid penetrates the inside. The one having a circulating structure is used. In this case, the space S1 between the plurality of blowers F1 to F4 of the forced cooling device 32A (32B) and the corresponding heat sinks 31A (31B) constitutes individual flow paths for each of the plurality of blowers F1 to F4. As described above, it is partitioned by a plurality of partition walls 34. When the partition wall is not provided as shown in FIG. 6B, when one of the plurality of blowers F1 to F4, the blower F2, stops due to a failure, the blowers sent from the sound blowers F1, F3 and F4 are released. The stopped blower F2 is rotated to generate a backflow. On the other hand, if the partition wall 34 is provided, even when one of the plurality of blowers F1 to F4, the blower F2, is stopped due to a failure, the blowers sent from the sound blowers F1, F3 and F4 are stopped. Can be rotated to prevent backflow. Further, even if the partition wall 34 is provided, the heat sink 31A is not cooled only partially, and the heat transfer fluid in the heat sink 31A flows through the entire heat sink. As a result, the heat sink 31A is cooled as a whole.

In the above embodiment, two cooling devices 30A and 30B are provided, but the number of cooling devices is not limited to two, and N or more cooling devices (N is an integer of 2 or more) are provided. , May be arranged side by side in the vertical direction.

[Modification example of cooling structure]
7 (A) to 7 (C) show a modified example of the cooling structure when a plurality of cooling devices are arranged in the vertical direction. The example of FIG. 7A is a case where the bottom portion 16A and the top portion 16B of the wind tunnel 16 are blocked by a structure or an installation object, respectively. In this case, two intake ports IN1 and IN2 and two exhaust ports OUT1 And only OUT2. The example of FIG. 7B is a case where the bottom 16A of the wind tunnel 16 is blocked by a structure or an installation, in which case two intake ports IN1 and IN2 and three exhaust ports OUT11, OUT12 and OUT2 It has. An example of FIG. 7C is a case where three cooling devices 30A to 30C are arranged in the vertical direction, and the bottom portion 16A and the top portion 16B of the wind tunnel 16 are blocked by a structure or an installed object, respectively. In this case, it is provided with three intake ports IN1 to IN3 and three exhaust ports OUT1 to OUT3.

8 (A) and 8 (B) show a modified example of the cooling structure when a plurality of cooling devices are arranged in the lateral direction. In the example of FIG. 8A, the two cooling devices 30A and 30B are arranged in the lateral direction with the side surface 16D of the horizontally placed wind tunnel 16 floating, and in this case, the three intake ports IN1 It also has IN21 and IN22 and two exhaust ports OUT1 and OUT2. An example of FIG. 8B is a case where three cooling devices 30A to 30C are arranged in the lateral direction, and the bottom portion 16A and the top portion 16B of the wind tunnel 16 are blocked by a structure or an installed object, respectively. In this case, it is provided with three intake ports IN1 to IN3 and three exhaust ports OUT1 to OUT3. The number of a plurality of cooling devices arranged in the horizontal direction is arbitrary.

[Modified example of installation of static power compensator]
In the embodiment described with reference to FIGS. 2 to 5, the static VAR compensator 1 is loaded on two utility poles, but if the weight of the static VAR compensator 1 is light, 1 is shown in FIG. It may be loaded on the utility pole of a book. In this case, the static VAR compensator 1 is loaded on the utility pole 27 so that the utility pole 27 is sandwiched between the inverter case 15 and the oil-filled storage case 13.

Of course, the static VAR compensator 1 may be installed on the ground without being loaded on the utility pole.

[Application example of power converter]
In the above embodiment, the present invention is provided for the power conversion device of the ineffective power compensation device 1, but the power conversion device of the present invention is also used for power supply equipment, power equipment and other electric equipment using a plurality of inverter devices. Of course, it can be applied.

According to the present invention, when a forced air cooling device including a plurality of blowers for cooling a heat sink is provided in each of n cooling devices, exhaust from one cooling device is provided between two adjacent cooling devices. Since a shielding plate is provided to prevent the heat sink from directly hitting the other cooling device, the heat sink can be forcibly air-cooled without being affected by the exhaust heat from the other cooling devices. Moreover, a shielding plate is configured to diagonally partition the space between one cooling device and the other cooling device, with an intake port for one cooling device and an exhaust port for the other cooling device. It is provided at a position facing each other via a shield plate, and the distance between the shield plate and one cooling device becomes smaller toward the back from the intake port, and the distance between the shield plate and the other becomes smaller toward the back from the exhaust port. Since the positional relationship between the shielding plate and the two adjacent cooling devices is determined so that the distance between the two cooling devices is small, exhaust from other cooling devices can be generated between the two adjacent cooling devices. , It is possible to prevent the situation where the air is taken in from the intake port of one of the cooling devices. Further, depending on how the shielding plate is tilted, it is possible to secure the amount of air blown from a plurality of blowers required for cooling the heat sink without increasing the distance between the two cooling devices.

1 Invalid power compensation device 2 System 3 Transformer 5 Power converter 7 DC reactor device 9 Transformer 11 Inverter control unit 12 Control unit 13 Oil-filled storage case 15 Inverter case 16 Wind tunnel 27 Utility pole 30A to 30C Cooling device 31A and 31B Heat sink 32A and 32B forced air cooling device 33 shielding plate

Claims (11)

N inverters (n is an integer of 2 or more) each equipped with a cooling device,
An inverter control unit for controlling a plurality of power conversion elements included in each of the inverter circuits of the n-number of the inverter device,
A power conversion device including a mounting portion for mounting the plurality of power conversion elements of the n cooling devices in the n inverter devices and an inverter case in which at least the inverter control unit is housed.
Each of the n-number of the cooling device of the n-number of the inverter device, the strength comprising: a heat sink having a mounting portion, a plurality of blowers arranged along the heatsink to blow the cooling air to the heat sink It has an air control device and
On the outer side of the side wall of the inverter case, a plurality of intake ports and a plurality of exhaust ports for the n cooling devices arranged side by side in the vertical direction or the horizontal direction are provided, and the n units are provided inside. A wind tunnel is provided to accommodate the main parts of the cooling device except for the mounting part.
Inside the wind tunnel, the exhaust gas from one of the cooling devices directly hits the other cooling device between two adjacent cooling devices arranged side by side in the vertical direction or the horizontal direction. Shielding plates are placed to block each
The shielding plate is configured to diagonally partition the space portion between the one cooling device and the other cooling device.
The intake port for the other cooling device and the exhaust port for the one cooling device are provided at positions facing each other via the shielding plate.
Moreover, the distance between the shielding plate and the other cooling device becomes smaller toward the back from the intake port, and the distance between the shielding plate and the one cooling device becomes smaller toward the back from the exhaust port. The positional relationship between the shielding plate and the two adjacent cooling devices is determined so as to be smaller .
The shielding plate is provided with a non-sloping portion in which the distance between the shielding plate and the corresponding cooling device does not change over a predetermined length in the direction in which a plurality of blowers are lined up near the exhaust port for the other cooling device. A power conversion device characterized by being The n intake ports for the n cooling devices are opened on one side surface of the wind tunnel that does not face the side wall of the inverter case, and n for the n cooling devices. The power conversion device according to claim 1, wherein the exhaust port is open to the other side surface of the wind tunnel facing the one side surface. The n cooling devices are lined up in the vertical direction.
The power conversion device according to claim 2, wherein an additional intake port for the cooling device located at the bottom of the wind tunnel is provided. The n cooling devices are arranged in the vertical direction.
The power conversion device according to claim 2, wherein an additional exhaust port for the cooling device located at the uppermost part of the wind tunnel is provided. The power conversion device according to claim 1, wherein the shielding plate has a multi-layer structure having one or more heat insulating layers in the intermediate layer. The n cooling devices are arranged in the vertical direction.
The heat sink extends in a horizontal direction orthogonal to the vertical direction, and has a structure in which a heat transfer fluid circulates inside.
One of claims 1 to 5 , wherein the space between the plurality of blowers and the corresponding heat sink is partitioned by a plurality of partition walls so as to form individual flow paths for each of the plurality of blowers. The power converter described in. The claim that the forced air cooling device is supported by a pull-out support structure so as to be pullable to the side where the panel is located with the panel forming the side surface of the wind tunnel facing the side wall of the inverter case removed. The power conversion device according to any one of 1 to 6. Inside the inverter case, there is a heat exchanger that exchanges heat with the outside air to lower the temperature inside the inverter case, and the heat exchanger to bring the air inside the inverter case into contact with the heat exchanger. The power conversion device according to any one of claims 1 to 7 , wherein an air circulation device that circulates air in an inverter case is arranged. In the inverter case, a control unit that outputs voltage and current values of the inverter circuit including a plurality of power conversion elements mounted on the mounting portions of the n cooling devices and the system to the inverter control unit. The power conversion device according to claim 8 , wherein the power conversion device is arranged at intervals so as to form the air circulation path between the two. A static power compensator that includes the power conversion device according to any one of claims 1 to 9 and compensates for the static power of the system. N inverters (n is an integer of 2 or more) each equipped with a cooling device,
An inverter control unit that controls a plurality of power conversion elements included in each inverter circuit of the n inverter devices, and an inverter control unit.
The n inverter devices include a mounting portion for mounting the plurality of power conversion elements of the cooling device and an inverter case in which at least the inverter control unit is housed.
Each of the n cooling devices of the n inverter devices is forced to include a heat sink having the mounting portion and a plurality of blowers arranged along the heat sink so as to blow air cooling air onto the heat sink. It has an air cooling device and
On the outer side of the side wall of the inverter case, a plurality of intake ports and a plurality of exhaust ports for the n cooling devices arranged side by side in the vertical direction or the horizontal direction are provided, and the n units are provided inside. A wind tunnel is provided to accommodate the main parts of the cooling device except for the mounting part.
Inside the wind tunnel, the exhaust gas from one of the cooling devices directly hits the other cooling device between two adjacent cooling devices arranged side by side in the vertical direction or the horizontal direction. Shielding plates are placed to block each
The shielding plate is configured to diagonally partition the space portion between the one cooling device and the other cooling device.
The intake port for the other cooling device and the exhaust port for the one cooling device are provided at positions facing each other via the shielding plate.
Moreover, the distance between the shielding plate and the other cooling device becomes smaller toward the back from the intake port, and the distance between the shielding plate and the one cooling device becomes smaller toward the back from the exhaust port. The positional relationship between the shielding plate and the two adjacent cooling devices is determined so as to be smaller.
The n intake ports for the n cooling devices are opened on one side surface of the wind tunnel that does not face the side wall of the inverter case, and n for the n cooling devices. The exhaust port is a power conversion device that is provided with a power conversion device that is open to the other side surface of the wind tunnel facing the one side surface to compensate for the reactive power of the system.
A transformer whose primary side is connected to the grid and a transformer that detects the voltage and current values of the grid are housed in an oil-filled storage case together with insulating oil.
The inverter case is a static power compensator in which the exhaust port provided in the wind tunnel is arranged so as to apply exhaust air to the outer surface of the oil-filled storage case.

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