JP7408482B2 - Uninterruptible power system - Google Patents

Description

The present disclosure relates to an uninterruptible power supply.

2. Description of the Related Art Conventionally, uninterruptible power supplies have been known that supply power from a power storage device to a load when a commercial power supply fails. In this regard, power storage devices may form a large-scale storage battery system in order to satisfy the demand for power outage compensation for loads (Patent Document 1).

JP2013-97926A

In this respect, conventionally, the installation of the storage battery module into the power storage device and the periodic replacement work had to be performed for each module. In addition, it was necessary to take sufficient safety precautions to prevent electric shock when making connections during installation or replacement work.

The present disclosure has been made in order to solve the above-mentioned problems, and provides an uninterruptible power supply device having a power storage device that can be installed and replaced more safely.

An uninterruptible power supply according to a certain aspect includes an AC/DC converter that converts an AC voltage from a commercial power supply into a DC voltage, a DC/AC converter that converts the DC voltage into an AC voltage and supplies it to an AC load, and a DC/AC converter. and a power storage device connected in parallel with the device to store DC voltage and supply power to the AC load. The power storage device includes a power storage device main body that is connected to a DC voltage bus of a DC-AC converter and has a wiring path set, and at least one or more storage battery units that are insertable into the power storage device main body. The storage battery unit includes at least one storage battery module and a connection unit used for wiring connection between the storage battery module and the power storage device main body. The connection unit includes an insulated handle and a plug that is movable by operating the handle and connects the wiring between the storage battery module and the wiring on the power storage device main body side.

Preferably, the wiring connection between the power storage value module and the power storage device main body is performed by inserting the plug into the plug insertion port on the power storage device main body side through the handle.

Preferably, the connection unit includes a housing provided with a slide hole on the side surface, a guide plate provided between the handle and the plug, and is supported by the slide hole and slides through the handle operation of the guide plate. including a guide shaft for

Preferably, the slide hole is formed in an L-shape.

According to one embodiment, the uninterruptible power supply can be installed and replaced more safely.

FIG. 1 is a diagram illustrating the configuration of an uninterruptible power supply system 1 based on an embodiment. FIG. 3 is a diagram illustrating a power storage device 30 according to an embodiment. FIG. 3 is a diagram illustrating wiring connections of power storage device 30 according to the embodiment. FIG. 3 is a diagram illustrating an external configuration of a power storage device 30 according to an embodiment. It is a figure explaining connection unit 54 according to an embodiment. FIG. 3 is a diagram illustrating how a connection unit 54 and a connection unit 58 are connected according to the embodiment.

This embodiment will be described in detail with reference to the drawings. Note that the same or corresponding parts in the figures are designated by the same reference numerals, and the description thereof will not be repeated.

FIG. 1 is a diagram illustrating the configuration of an uninterruptible power supply system 1 based on the embodiment. As shown in FIG. 1, uninterruptible power supply 10 is connected to AC input power supply 3 and load 20.

The AC input power source 3 is an AC power source that supplies AC power to the uninterruptible power supply 10, and is, for example, a commercial AC power source. A three-phase, three-wire (3φ3W) type is shown as an example of an AC input power source. However, the type of AC input power source is not limited to the three-phase, three-wire type, and may be, for example, a three-phase, four-wire type power source, or a single-phase, three-wire type power source.

Uninterruptible power supply 10 includes converter 5 , power storage device 30 , inverter 7 , and chopper circuit 6 . Converter 5 and inverter 7 are connected in series between AC input power supply 3 and load 20. Power storage device 30 is connected to converter 5 via chopper circuit 6 in parallel with inverter 7 . Converter 5 converts AC voltage supplied from AC input power supply 3 into DC voltage. Inverter 7 converts the DC voltage converted by converter 5 into AC voltage. Chopper circuit 6 converts the voltage level of the DC voltage and supplies it to power storage device 30 .

Power storage device 30 includes a switch 32 and a plurality of storage battery units 40 that constitute a secondary battery. Power storage device 30 is a device for supplying DC voltage to inverter 7 when AC input power supply 3 cannot supply AC voltage (for example, during a power outage). Note that the switch 32 is conductive, and the converter 5 is charging the plurality of storage battery units 40 that constitute the secondary battery.

During normal times when AC power is supplied from the AC input power source 3, the DC voltage generated by the converter 5 and the chopper circuit 6 is stored in the power storage device 30, and is converted into AC voltage by the chopper circuit 6 and the inverter 7. is supplied to the load 20. On the other hand, in the event of a power outage in which the supply of AC voltage from the AC input power supply 3 is stopped, the operation of the converter 5 is stopped, and the DC voltage stored in the power storage device 30 is converted to AC voltage by the chopper circuit 6 and the inverter 7, and the load 20 is is supplied to Therefore, according to the uninterruptible power supply, even if converter 5 is stopped due to a power outage, operation of load 20 can be continued using the power stored in power storage device 30. Although this example describes a configuration in which the chopper circuit 6 is provided, it is also possible to adopt a configuration in which the chopper circuit 6 is not provided if the converter 5 and the inverter 7 can sufficiently step up and down the voltage. .

FIG. 2 is a diagram illustrating the power storage device 30 according to the embodiment. As shown in FIG. 2, power storage device 30 is connected to positive and negative bus bars 30P and 30N, respectively.

Bus bars 30P and 30N are connected to a DC voltage bus of converter 5 via chopper circuit 6. Power storage device 30 includes a control circuit 35, a switch 32, and a plurality of storage battery modules 50 in one housing. As an example, a case where 17 storage battery modules 50 are provided is shown. Note that the number can be adjusted.

FIG. 3 is a diagram illustrating wiring connections of power storage device 30 according to the embodiment. As shown in FIG. 3, a plurality of storage battery units 40 each including at least one storage battery module 50 are arranged in multiple stages. In this example, a case where seven stages are arranged is shown. Each storage battery unit 40 is connected in series. As an example, a case is shown in which storage battery units 40-1 to 40-7 are provided from the lower stage to the upper stage. Each storage battery unit 40-1 to 40-6 includes three storage battery modules 50. Storage battery unit 40-7 includes one storage battery module 50.

The control line through which the control signal from the control circuit 35 is output is indicated by a dashed line, and is connected in order from the storage battery module 50 of the storage battery unit 40-1 to the storage battery module 50 of the storage battery unit 40-7. There is. The power supply line is shown as a solid line, and is connected in order from the storage battery module 50 of the storage battery unit 40-1 to the storage battery module 50 of the storage battery unit 40-7 between the bus bar 30P and the bus bar 30N.

Storage battery units 40-1 to 40-7 are provided to be detachable from the main body of power storage device 30. Since each storage battery unit is provided to be replaceable, the replacement work can be performed more efficiently than when replacing storage battery modules one by one. The storage battery unit 40 includes two connection units 52 and 54, and at least one storage battery module 50.

On the main body side of power storage device 30, connection units 56 and 58 used for connection with storage battery unit 40 are provided corresponding to each stage. In this example, connection units 56 and 58 are provided in each stage corresponding to the seven stages of storage battery units 40, respectively. By inserting the storage battery unit 40, the connection unit 52 corresponding to each stage of the storage battery unit 40 is connected to the connection unit 56 corresponding to each stage on the main body side. Similarly, the connection unit 54 corresponding to each stage of the storage battery unit 40 is connected to the connection unit 58 corresponding to each stage on the main body side.

Wiring paths for the connection units 56 and 58 on the main body side are set in advance before the storage battery unit 40 is inserted. The seventh upper connection unit 56 is connected to the bus 30P via the switch 32. The seventh-stage connection unit 58 is connected to the sixth-stage connection unit 56. The sixth-stage connection unit 58 is connected to the fifth-stage connection unit 56. The fifth stage connection unit 58 is connected to the fourth stage connection unit 56. The fourth-stage connection unit 58 is connected to the third-stage connection unit 56. The third-stage connection unit 58 is connected to the second-stage connection unit 56. The second stage connection unit 58 is connected to the first stage connection unit 56. The first stage connection unit 58 is connected to the bus bar 30N.

In this example, by inserting the storage battery unit 40 at each stage and performing a predetermined operation, it is connected to the connection unit on the main body side. Specifically, the connection units are connected to each other by performing a predetermined operation on the connection units 52 and 54 provided in the storage battery unit 40.

FIG. 4 is a diagram illustrating an external configuration of power storage device 30 according to the embodiment. As shown in FIG. 4A, a case is shown in which each storage battery unit 40 is inserted into the main body side of the power storage device 30. In addition, in this example, the wiring connection of the storage battery unit 40 is omitted. As shown in FIG. 4(B), this example shows the case where the first stage storage battery unit 40-1 is inserted. Although not shown, the storage battery unit 40 is provided with rails that can adjust the relative positional relationship between the storage battery module 50 side and the connection units 52 and 54, so that the storage battery module 50 side is arranged closer to the main body side. ing. FIGS. 4(C) and 4(D) show an enlarged view of the storage battery unit 40-1. FIG. 4(E) shows the wiring connections within the storage battery unit 40-1. Note that although this example shows a case in which the relative positional relationship between the storage battery module 50 side and the connection units 52 and 54 side can be adjusted using rails, a configuration in which the rails are not provided is also possible. It is possible.

FIG. 5 is a diagram illustrating the connection unit 54 according to the embodiment. FIGS. 5A and 5B show an initial state before a predetermined operation. FIG. 5(C) and FIG. 5(D) show the state after a predetermined operation.

As shown in FIG. 5(A), a front view of the connection unit 54 is shown. The connection unit 54 includes a main body casing 60 of the connection unit 54 and a plug portion 63. The plug part 63 includes an insulated handle 62, a guide plate 64 that supports the handle 62, a plug 70 provided on the opposite side of the handle 62, and a guide shaft 68 connected to the guide plate 64. including. The plug 70 is wire-connected to the power supply line of the storage battery module 50 in the storage battery unit 40. By inserting the plug 70 into a plug insertion port of the connection unit 58 (not shown), the connection unit 54 and the connection unit 58 are electrically connected. As shown in this example, the housing 60 of the main body of the connection unit 54 is provided with an opening on the front side, and a guide plate 64 is provided so as to close the opening. By blocking the opening on the front side of the housing 60 with the guide plate 64, it is possible to prevent the operator from coming into contact with the plug 70 provided inside the housing 60.

Slide holes 66 are provided on both sides of the casing 60 of the connection unit 54 . The guide plate 64 is connected to a guide shaft 68, and the guide shaft 68 is supported in the slide hole 66. Thereby, the guide plate 64 is provided so as to be movable along the slide hole 66 via the guide shaft 68. In this example, a handle 62 is provided on the guide plate 64, and the operator can move the guide plate 64 by operating the handle 62. The slide hole is L-shaped.

As shown in FIG. 5(B), the back side of the connection unit 58 is shown. The connection unit 54 is provided with an opening 61 on the back side, the periphery of which is covered with an insulator. The shape of the opening 61 is matched to the shape of the plug 70, and the plug 70 is configured to be able to protrude outward from the opening 61.

As shown in FIG. 5(C), the guide shaft 68 connected to the guide plate 64 via the handle 62 is moved along the slide hole 66 to the tip of the L-shape. As shown in FIG. 5(D), the plug 70 is pushed out from the opening 61. By protruding the plug 70 from the opening 61, it is inserted into the plug insertion port of the connection unit 58 on the main body side. Thereby, the connection unit 58 and the connection unit 54 are electrically connected.

FIG. 6 is a diagram illustrating how the connection unit 54 and connection unit 58 are connected according to the embodiment. As shown in FIG. 6(A), a plug insertion opening 72 is provided inside the connection unit 58. Further, an opening 71 is provided around the connection unit 58 and covered with an insulator. The shape of the opening 71 is matched to the shape of the plug 70, and the plug 70 can be inserted inside through the opening 71.

As shown in FIG. 6(B), the guide plate 64 is moved inside via the handle 62. As a result, the plug 70 is pushed out from the opening 61 and is combined with the plug insertion port 72 through the opening 71 of the connection unit 84 . That is, the plug 70 and the plug insertion port 72 are fitted together. This forms a current path.

In the case of this configuration, the plug 70 is placed inside the connection unit 54 before the connection unit 54 and the connection unit 58 are connected. Therefore, the operator cannot touch the plug 70 that serves as a current path. Further, the plug insertion port 72 of the connection unit 58 is also arranged inside the connection unit 58. Therefore, the operator cannot touch the plug insertion port 72, which serves as a current path. Therefore, before the connection unit 54 and connection unit 58 are connected, the operator cannot touch either the plug 70 or the plug insertion port 72, which serves as a current path, so that electric shock can be reliably prevented. It is.

Further, in this example, the slide hole 66 is formed in an L-shape, and the plug 70 cannot be moved toward the opening 61 via the handle 62 when the guide shaft 68 is at the initial position. It is necessary to once lift the guide plate 64 via the handle 62 along the L-shaped slide hole 66 and move it toward the opening 61 side. Thereby, it is possible to prevent the plug 70 from being inserted into the plug insertion port due to an erroneous operation. In this example, a configuration in which an L-shaped slide hole is provided has been described, but the configuration is not limited to this, and other shapes are also possible.

In this example, the connection between the connection unit 54 and the connection unit 58 has been described, but the same applies to the connection between the connection unit 52 and the connection unit 56. In addition, in this example, although the structure which provided two connection units 52 and 54 on both sides of the storage battery unit 40 was demonstrated, it is also possible to set it as either one. With the configuration of the embodiment, a plurality of storage battery modules 50 can be installed as one storage battery unit 40, so installation and periodic replacement work can be easily performed. Further, since the plug 70 of the connection unit 54 and the plug insertion port 72 of the connection unit 58, which serve as a current path, can be connected to each other without coming into contact with each other, it is possible to reliably prevent electric shock. In other words, installation and replacement work can be carried out more safely.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1 uninterruptible power supply system, 2 generator, 3 AC input power supply, 4 controller, 5 converter, 6 chopper circuit, 7 inverter, 10 uninterruptible power supply, 20 load, 30 power storage device, 32 switch, 35 control circuit, 40 storage battery Unit, 50 Storage battery module, 52, 54, 56, 58 Connection unit.

Claims (4)

an AC/DC converter that converts AC voltage from a commercial power source into DC voltage;
a DC-AC converter that converts the DC voltage to AC voltage and supplies it to an AC load;
a power storage device connected in parallel with the DC/AC converter to store the DC voltage and supply power to the AC load;
The power storage device includes:
a power storage device main body connected to a DC voltage bus of the DC AC converter and having a wiring path set;
at least one or more storage battery units insertably provided in the power storage device main body,
The storage battery unit is
at least one storage battery module;
A connection unit used for wiring connection between the storage battery module and the power storage device main body,
The connection unit is
insulated handle,
An uninterruptible power supply device, the uninterruptible power supply device including a plug that is movable by a handle operation using the handle and that connects the storage battery module with wiring on the power storage device main body side. The uninterruptible power supply according to claim 1, wherein the wiring connection between the storage battery module and the power storage device main body is performed by inserting the plug into a plug insertion port on the power storage device main body side through the handle. Device. The connection unit is
A housing with a slide hole on the side,
a guide plate provided between the handle and the plug;
The uninterruptible power supply according to claim 1, further comprising a guide shaft supported in the slide hole and slidable through the handle operation of the guide plate. The uninterruptible power supply according to claim 3, wherein the slide hole is formed in an L shape.

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