JP7399842B2 - uninterruptible power system - Google Patents

Description

The present disclosure relates to an uninterruptible power supply (UPS) that prevents load equipment from stopping by supplying power stored in a battery to the load at high speed when the commercial power supply from the power system drops momentarily or there is a power outage. The present invention relates to a parallel redundant UPS configured with the following.

2. Description of the Related Art Conventionally, uninterruptible power supplies (hereinafter simply referred to as UPS) have been used as power sources for important loads such as computers, which cannot tolerate momentary power outages.

Continuation of power supply by UPS power supply is required during normal operation and inspection 24 hours a day, 365 days a year.

In this regard, Japanese Patent Application Publication No. 2017-50933 discloses an uninterruptible power supply system in which a plurality of UPSs are connected in parallel and operated in parallel for a common load.

Japanese Patent Application Publication No. 2017-50933

On the other hand, with parallel redundant uninterruptible power supply systems in which multiple units are connected in parallel, it is necessary to switch to a maintenance bypass circuit when, for example, adding a UPS, which poses the problem of temporary loss of power supply reliability. .

The present disclosure has been made to solve the above-mentioned problems, and provides an uninterruptible power supply system that can be tested without impairing power supply reliability in a parallel redundant uninterruptible power supply system. The purpose is to

According to an embodiment, an uninterruptible power supply system includes a plurality of uninterruptible power supplies and a parallel panel that is connected to the plurality of uninterruptible power supplies and is provided so that additional uninterruptible power supplies can be installed. The parallel panel is provided corresponding to the plurality of uninterruptible power supplies and the plurality of input terminals each connected to the output of the additional uninterruptible power supply, and the plurality of uninterruptible power supplies connected to the plurality of uninterruptible power supplies. A plurality of switches capable of switching the output of the power supply device and the additional uninterruptible power supply device are provided corresponding to the plurality of input terminals, and each switch is provided between the corresponding input terminal and the corresponding switch. Multiple reactors are provided corresponding to multiple input terminals, and each is connected to the corresponding reactor in parallel with the corresponding switch, and connected to the output of the corresponding reactor of another uninterruptible power supply via external wiring. A plurality of first test terminals are provided so as to be connectable to the plurality of first test terminals for executing a first test, and a plurality of first test terminals are provided corresponding to the plurality of input terminals, each of which is connected to a corresponding reactor in parallel with a corresponding switch. , a plurality of second test terminals connectable to the test load and for executing a second test.

The uninterruptible power supply system of the present disclosure can be tested without impairing power supply reliability.

FIG. 1 is a diagram illustrating a circuit configuration of an uninterruptible power supply system based on an embodiment. It is a figure explaining the 1st test of the uninterruptible power supply system based on an embodiment. It is a figure explaining the 2nd test of the uninterruptible power supply system based on an embodiment. It is a figure explaining another 2nd test of the uninterruptible power supply system based on an 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 a circuit configuration of an uninterruptible power supply system based on an embodiment. As shown in FIG. 1, the uninterruptible power supply system according to the embodiment includes a plurality of uninterruptible power supplies (UPS) 11 that receive power from a commercial power source 1, convert the power, and supply power to load equipment 20. - 13, a parallel panel 40 that connects the outputs of each of the plurality of UPSs 11 to 13 in parallel, and a parallel panel 40 that can switch the power supply to the load equipment 20 to the commercial power supply 1 during maintenance and inspection of the plurality of UPSs 11 to 13. It includes a maintenance bypass panel 30 and input-side circuit breakers 21 to 24 that are provided to be able to cut off the power supply from the commercial power source 1. As an example, a parallel redundant system of three uninterruptible power supplies (UPS) is shown, but the number is not limited to three, and a configuration may include a plurality of UPS.

Each UPS 11 to 13 includes a converter 2 that converts AC voltage to DC voltage, an inverter 3 that converts the DC voltage output from converter 2 to AC voltage, and a bypass switch that is provided to bypass the converter 2 and inverter 3. circuit 5. Further, each UPS 11 to 13 is connected to a storage battery 4 that can supply power during a power outage.

The maintenance bypass board 30 includes changeover switches 31 and 32 that are provided to switch between power supply from the UPSs 11 to 13 and power supply from a bypass path connected to the commercial power source 1.

The parallel panel 40 has input terminals 61 to 63 connected to the outputs of the UPSs 11 to 13, respectively, and switches 41 to 63 provided corresponding to the input terminals 61 to 63, respectively, and capable of switching the outputs of the connected UPSs 11 to 13. 43, and reactors 71 to 73 provided corresponding to the input terminals 61 to 63, respectively, and provided between the corresponding input terminals and the corresponding switches, and reactors 71 to 73 provided corresponding to the input terminals 61 to 63, respectively, is connected to the corresponding reactor in parallel with the corresponding switch, and is provided so as to be connectable to the output of the corresponding reactor of another UPS via external wiring, and for executing the first test. 83 and input terminals 61 to 63, respectively, and each is connected to a corresponding reactor in parallel with a corresponding switch, and is provided so as to be connectable to a test load 120 for executing a second test. and second test terminals 91 to 93.

The parallel board 40 is provided corresponding to the second test terminals 91 to 93, respectively, and each further includes test switches 101 to 103 provided between the corresponding second test terminal and the corresponding reactor.

Reactors 71 to 73 are provided as reactors for suppressing cross flow.

The input terminal 61 is connected to the output of the UPS 11. Reactor 71 is connected between input terminal 61 and switch 41. The first test terminal 81 is connected to the reactor 71 in parallel with the switch 41 . The second test terminal 91 is connected to the reactor 71 in parallel to the switch 41 via the test switch 101 .

Input terminal 62 is connected to the output of UPS 12. Reactor 72 is connected between input terminal 62 and switch 42 . The first test terminal 82 is connected to the reactor 72 in parallel with the switch 42 . The second test terminal 92 is connected to the reactor 72 in parallel to the switch 42 via the test switch 102 .

The input terminal 63 is connected to the output of the UPS 13. Reactor 73 is connected between input terminal 63 and switch 43. The first test terminal 83 is connected to the reactor 73 in parallel with the switch 43. The second test terminal 93 is connected to the reactor 73 in parallel to the switch 43 via the test switch 103 .

FIG. 2 is a diagram illustrating a first test of the uninterruptible power supply system based on the embodiment. As shown in FIG. 2, as an example, a case where a no-load parallel test is performed on UPS 12 and UPS 13 is shown. Specifically, switch 41 is turned on and switches 42 and 43 are set to open. This maintains power supply from the UPS 11 to the load equipment 20.

The first test terminal 82 and the first test terminal 83 are connected by an external wiring 110. A switch 112 is provided on the external wiring 110. A configuration in which the switch 112 is not provided is also possible.

Since the switches 42 and 43 are set to open, the UPS 12 and the UPS 13 are in a no-load state. In this state, the first test terminal 82 and the first test terminal 83 are connected. This tests whether the parallel operation control of UPS 12 or UPS 13 is performed normally.

If current flows from UPS 12 or UPS 13 in the no-load parallel test, parallel operation control is not being performed normally, and an abnormal state can be confirmed. If no current flows from the UPS 12 or UPS 13 in the no-load parallel test, it can be confirmed that the parallel operation control is normal.

For example, consider a case where UPS 11 and UPS 12 are already installed in the uninterruptible power supply system and UPS 13 is added. By executing the above-described no-load parallel test, it is possible to detect an abnormality in the parallel operation control of the UPS 13.

As an example, a case has been described in which a no-load parallel test of UPS 12 and UPS 13 is executed while the power supply from the UPS 11 to the load equipment 20 is maintained. A no-load parallel test of UPS 11 and UPS 13 may be performed.

FIG. 3 is a diagram illustrating a second test of the uninterruptible power supply system based on the embodiment. As shown in FIG. 3, as an example, a case is shown in which a load test is performed on the UPS 12 and the UPS 13. Specifically, switch 41 is turned on and switches 42 and 43 are set to open. This maintains power supply from the UPS 11 to the load equipment 20.

The first test terminal 82 and the first test terminal 83 are connected by an external wiring 110. A switch 112 is provided on the external wiring 110. A configuration in which the switch 112 is not provided is also possible.

A test load 120 is connected to the second test terminal 93.

The test switch 103 is turned on during the second test. As a result, the outputs of the UPS 12 and UPS 13 connected in parallel are connected to the test load 120.

In this state, the UPS 12 and the UPS 13 test whether the desired power can be supplied to the test load 120. If the desired power is supplied from the UPS 12 and the UPS 13 through the load test, it can be confirmed that the UPS 12 and the UPS 13 are in a normal state. On the other hand, if desired power is not supplied, an abnormal state of at least one of UPS 12 and UPS 13 can be confirmed. It is possible to take alternative measures for the abnormal state, such as replacing the UPS with another one.

For example, consider a case where UPS 11 and UPS 12 are already installed in the uninterruptible power supply system and UPS 13 is added. By executing the above-described load test, it is possible to detect whether or not there is an abnormality in the power supply ability when adding the UPS 13.

As an example, a case has been described in which a load test is performed on the UPS 12 and UPS 13 while the power supply from the UPS 11 to the load equipment 20 is maintained. A load test of the UPS 13 may also be executed.

In this example, a case has been described in which the test load 120 is connected to the second test terminal 93, but the present invention is not limited to this, and the test load 120 may be connected to the second test terminal 92.

In conventional parallel redundant uninterruptible power supply systems, when adding a new UPS to an existing UPS and performing a parallel test on the existing UPS and the added UPS, the power supply to the load equipment is bypassed for maintenance. It was necessary to switch to commercial power using a panel, which caused the problem of temporary loss of power supply reliability.

By providing the parallel panel 40 according to the embodiment, when adding a UPS in a parallel redundant uninterruptible power supply system, the added UPS can be tested in parallel while the existing UPS continues to supply inverter power to the load equipment. It is possible to implement this method, and it is possible to improve power supply reliability during parallel testing.

In the above, the case where there are two existing UPSs has been described, but the present invention can be similarly applied to a parallel redundant uninterruptible power supply system in which the number of existing UPSs is three or more. Further, the number of UPSs to be added is not limited to one, and the present invention is similarly applicable to cases in which a plurality of UPSs are added.

In the above, we have explained the test when adding another UPS to an existing UPS, but this is not limited to when adding a UPS, but it can also be tested when performing maintenance and inspection on an existing UPS. It is possible.

FIG. 4 is a diagram illustrating another second test of the uninterruptible power supply system based on the embodiment. As shown in FIG. 4, a case is shown in which a load test is performed on the UPS 12 as an example. In this example, the state before the UPS 13 is added is shown.

Specifically, switch 41 is turned on and switch 42 is set to open. This maintains power supply from the UPS 11 to the load equipment 20.

A test load 120 is connected to the second test terminal 92.

Test switch 102 is turned on during the second test. Thereby, the UPS 12 becomes connected to the test load 120.

In this state, the UPS 12 tests whether or not it can supply desired power to the test load 120. If the desired power is supplied from the UPS 12 through the load test, it can be confirmed that the UPS 12 is in a normal state. On the other hand, if desired power is not supplied, an abnormal state of the UPS 12 can be confirmed. It is possible to take alternative measures for the abnormal state, such as replacing the UPS with another one.

By executing the above load test, it is possible to detect whether there is an abnormality in the power supply ability of the UPS 12 at the time of maintenance inspection.

As an example, a case has been described in which a load test of the UPS 12 is executed while the power supply from the UPS 11 to the load equipment 20 is maintained, but a load test of the UPS 11 is performed while the power supply from the UPS 12 to the load equipment 20 is maintained. may also be executed.

By providing the parallel panel 40 according to the embodiment, in a parallel redundant uninterruptible power supply system, it is possible to perform a load test on the existing UPS while continuing to supply inverter power to the load equipment using the existing UPS. , it is possible to improve power supply reliability during maintenance and inspection tests.

(Additional note)
The embodiments described above include the following technical ideas.

An uninterruptible power supply system according to an embodiment includes a plurality of uninterruptible power supplies (11, 12), and a parallel power supply system that is connected to the plurality of uninterruptible power supplies and is provided so that an uninterruptible power supply (13) can be added. A board (40). The parallel panels are provided corresponding to the plurality of uninterruptible power supplies and the plurality of input terminals (61 to 63) each connected to the output of the additional uninterruptible power supply, and are connected to the plurality of input terminals. A plurality of switches (41 to 43) capable of switching the output of a plurality of uninterruptible power supplies and an additional uninterruptible power supply are provided corresponding to a plurality of input terminals, and each switch is provided corresponding to a plurality of input terminals. A plurality of reactors (71 to 73) are provided between the corresponding switch and the plurality of input terminals, each of which is connected to the corresponding reactor in parallel with the corresponding switch, and is connected to the corresponding reactor in parallel with the corresponding switch. Each corresponds to a plurality of first test terminals (81 to 83) that can be connected to the output of a corresponding reactor of the uninterruptible power supply via external wiring to execute a first test, and a plurality of input terminals. a plurality of second test terminals (91 to 93), each of which is connected to a corresponding reactor in parallel with a corresponding switch, and which is connectable to a test load and for executing a second test; including.

A first test terminal and a second test terminal are provided, and it is possible to perform a test without impairing power supply reliability.

In one aspect, the parallel panel is provided corresponding to each of the plurality of second test terminals, and each of the parallel panels includes a plurality of test switches (101 to 103) provided between the corresponding second test terminal and the corresponding reactor. further including.

In one aspect, the first test includes connecting a first test terminal corresponding to an added uninterruptible power supply and a first test terminal corresponding to one uninterruptible power supply of the plurality of uninterruptible power supplies to an external This is a no-load parallel test that connects with wiring.

In one aspect, the second test is a load test that connects a test load to the second test terminal and detects the output of the corresponding uninterruptible power supply.

In one aspect, the power supply system further includes a maintenance bypass board (30) capable of switching output from a parallel board connected to a plurality of uninterruptible power supplies to commercial power to supply power to a load.

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 Commercial power supply, 2 Converter, 3 Inverter, 4 Storage battery, 5 Bypass switching circuit, 20 Load equipment, 21 to 24 Input circuit breaker, 30 Maintenance bypass panel, 40 Parallel panel, 41, 42, 43, 112 Switch, 61, 62, 63 Input terminal, 71, 72, 73 Cross flow suppression reactor, 81, 82, 83 First test terminal, 91, 92, 93 Second test terminal, 101, 102, 103 Test switch, 110 External wiring, 120 Test load.

Claims (5)

multiple uninterruptible power supplies;
a parallel panel that is connected to the plurality of uninterruptible power supplies and is provided so that the uninterruptible power supplies can be added;
The parallel board is
a plurality of input terminals respectively connected to the outputs of the plurality of uninterruptible power supplies and the additional uninterruptible power supply;
a plurality of switches that are provided corresponding to the plurality of input terminals and capable of switching outputs of the plurality of uninterruptible power supplies connected to the plurality of uninterruptible power supply devices and the additional uninterruptible power supply device;
a plurality of reactors provided corresponding to the plurality of input terminals, each of which is provided between the corresponding input terminal and the corresponding switch;
provided corresponding to each of the plurality of input terminals, each connected to the corresponding reactor in parallel with the corresponding switch, and connected to the output of the corresponding reactor of another uninterruptible power supply via external wiring. a plurality of first test terminals for performing a first test;
A plurality of input terminals are provided corresponding to the plurality of input terminals, each is connected to the corresponding reactor in parallel with the corresponding switch, and is connectable to a test load for executing a second test. an uninterruptible power supply system including a second test terminal; The parallel board is provided corresponding to each of the plurality of second test terminals, and each further includes a plurality of test switches provided between the corresponding second test terminal and the corresponding reactor. The uninterruptible power supply system described in 1. In the first test, a first test terminal corresponding to the added uninterruptible power supply and a first test terminal corresponding to one of the plurality of uninterruptible power supplies are connected to the external The uninterruptible power supply system according to claim 1, wherein the uninterruptible power supply system is a no-load parallel test connected by wiring. 2. The uninterruptible power supply system according to claim 1, wherein the second test is a load test in which the test load is connected to the second test terminal and the output of the corresponding uninterruptible power supply is detected. The uninterruptible power supply system according to claim 1, further comprising a maintenance bypass board capable of switching the output from the parallel board connected to the plurality of uninterruptible power supplies to a commercial power supply to supply power to a load.

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