WO2023119481A1 - Uninterruptible power supply system and method for updating uninterruptible power supply system - Google Patents

Uninterruptible power supply system and method for updating uninterruptible power supply system Download PDF

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Publication number
WO2023119481A1
WO2023119481A1 PCT/JP2021/047562 JP2021047562W WO2023119481A1 WO 2023119481 A1 WO2023119481 A1 WO 2023119481A1 JP 2021047562 W JP2021047562 W JP 2021047562W WO 2023119481 A1 WO2023119481 A1 WO 2023119481A1
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Prior art keywords
uninterruptible power
power supply
switch
ups
switches
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PCT/JP2021/047562
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French (fr)
Japanese (ja)
Inventor
公平 鎌田
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東芝三菱電機産業システム株式会社
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Priority to JP2022530778A priority Critical patent/JP7326614B1/en
Priority to PCT/JP2021/047562 priority patent/WO2023119481A1/en
Publication of WO2023119481A1 publication Critical patent/WO2023119481A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present disclosure relates to an uninterruptible power supply system and an update method for the uninterruptible power supply system.
  • Patent Document 1 discloses a parallel redundant uninterruptible power supply system.
  • a parallel redundant uninterruptible power supply system includes a plurality of uninterruptible power supplies (UPSs) connected in parallel to loads.
  • UPSs uninterruptible power supplies
  • the new UPS in order to conduct a parallel test while continuing to supply power to the load, the new UPS is temporarily placed in a separate space from the existing UPS, and a parallel test is performed to check for any abnormalities in parallel operation. Work was being done to confirm After completing this work, the work of stopping and removing the existing UPS and the work of switching to power feeding by the new UPS were performed.
  • the present disclosure has been made to solve the problems described above, and an object of the present disclosure is to provide a parallel redundant uninterruptible power supply system in which one uninterruptible power supply device is connected while continuing to supply power to a load. It is to allow for machine-by-machine upgrades and parallel testing.
  • An uninterruptible power supply system includes a plurality of uninterruptible power supply apparatuses including first to third uninterruptible power supply apparatuses, and a plurality of uninterruptible power supply apparatuses for connecting in parallel to a load. and a plurality of switches.
  • Each of the plurality of uninterruptible power supplies includes a power converter that generates AC voltage with a predetermined frequency, and an output terminal that outputs the AC voltage generated by the power converter.
  • the plurality of switches include a first switch connected between the output terminal of the first uninterruptible power supply and the load, and a second switch connected between the output terminal of the second uninterruptible power supply and the load.
  • the uninterruptible power system further comprises connection circuitry.
  • the connection circuit connects the output terminal of the first uninterruptible power supply and the output terminal of the second uninterruptible power supply in a state where the first and second switches are turned off and the third switch is turned on. configured to connect a reactor between
  • An update method for an uninterruptible power supply system includes first to third uninterruptible power supply devices each having an output terminal; and first to third switches for respectively connecting to the uninterruptible power supply system.
  • Each of the first to third uninterruptible power supplies includes a power converter and is configured to output to an output terminal an AC voltage of a predetermined frequency generated by the power converter.
  • the update method stops the operation of the first and second uninterruptible power supply systems when the first to third uninterruptible power supply systems are operating in parallel with the first to third switches turned on.
  • FIG. 10 is a diagram illustrating a process of stopping and paralleling off an existing UPS; It is a figure explaining the process of removing existing UPS. It is a figure explaining the process of installing new UPS. It is a figure explaining the process of implementing a parallel test.
  • FIG. 10 is a diagram illustrating a process of parallel loading UPSs after a parallel test;
  • FIG. 10 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to a first modified example;
  • FIG. 9 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to a second modification;
  • FIG. 1 is a circuit block diagram showing an example of the configuration of an uninterruptible power supply system according to an embodiment.
  • an uninterruptible power supply system 100 includes a plurality of (three in the figure) uninterruptible power supplies (UPS: Uninterruptible Power Supply) 11-13, a plurality of switches 15-18, and a maintenance bypass circuit 6. , a parallel board 20 , a maintenance bypass board 30 , and a test parallel board 40 .
  • UPS Uninterruptible Power Supply
  • the UPS 11 includes an input terminal T1, a battery terminal T2, an output terminal T3, a converter 2, an inverter 3, a bypass switching circuit 5, and a control circuit 7.
  • the input terminal T1 receives commercial-frequency AC power from the commercial AC power supply 1.
  • Battery terminal T2 is connected to battery 4 .
  • a battery 4 stores DC power.
  • a capacitor may be connected instead of the battery 4 .
  • the output terminal T3 is connected to the loads 50a-50c through the parallel board 20 and the maintenance bypass board 30.
  • the switch 16 is, for example, a breaker, and is connected between the commercial AC power supply 1 and the input terminal T1.
  • the switch 16 is normally turned on when the AC power is supplied from the commercial AC power supply 1, and is turned off when the AC power from the commercial AC power supply 1 is stopped.
  • the converter 2 receives commercial-frequency AC power from the commercial AC power supply 1 via the switch 16 and is controlled by the control circuit 7 .
  • the converter 2 normally converts the AC power supplied from the commercial AC power supply 1 via the switch 16 into DC power and outputs the DC power to the DC line.
  • the output voltage of converter 2 can be controlled to a desired value.
  • the inverter 3 is connected to the DC line and controlled by the control circuit 7 .
  • the inverter 3 converts the DC power supplied from the converter 2 through the DC line into AC power of commercial frequency and outputs the AC power.
  • AC power generated by inverter 3 is applied to loads 50a-50c via output terminal T3, parallel board 20 and maintenance bypass board 30.
  • the inverter 3 normally converts the DC power supplied from the converter 2 into AC power, and converts the DC power supplied from the battery 4 into AC power during a power failure of the commercial AC power supply 1 .
  • the output voltage of the inverter 3 can be controlled to a desired value.
  • bypass switching circuit 5 is connected between the input terminal T1 and the output terminal T3 and controlled by the control circuit 7.
  • Bypass switching circuit 5 is turned off in an inverter power supply mode in which AC power generated by inverter 3 is supplied to a load, and is turned on in a bypass power supply mode in which AC power is supplied from commercial AC power supply 1 to a load.
  • Control circuit 7 normally controls converter 2 and inverter 3 to generate commercial-frequency AC power, and in the event of a power failure, stops operation of converter 2 and controls inverter 3 to generate commercial-frequency AC power. generate.
  • Each of UPS 12 and 13 has the same configuration as UPS 11.
  • Switch 17 is connected between commercial AC power supply 1 and input terminal T1 of UPS 12 .
  • Switch 18 is connected between commercial AC power supply 1 and input terminal T1 of UPS 13 .
  • the switches 17 and 18 are normally turned on, and turned off when the commercial AC power supply 1 fails.
  • the control circuits 7 of the UPSs 11-13 are connected to each other by a communication cable 8, and information is exchanged between the UPSs 11-13 via the communication cable 8.
  • Each control circuit 7 controls the corresponding converter 2 and inverter 3 so that the shared currents of the plurality of UPSs 11-13 are equal.
  • Control circuit 7 stops operation of corresponding converter 2 and inverter 3 when the corresponding UPS is to be stopped, and stops operation of corresponding converter 2 and inverter 3 when the corresponding UPS is to be put into the operating state. continue driving.
  • the parallel board 20 includes input terminals T11 to T13, an output terminal T14, reactors 21a, 22a and 23a, and switches 21b, 22b and 23b.
  • Parallel board 20 corresponds to an embodiment of "first parallel board” and "parallel board”.
  • the input terminal T11 is connected to the output terminal T3 of the UPS11.
  • the input terminal T12 is connected to the output terminal T3 of the UPS12.
  • the input terminal T13 is connected to the output terminal T3 of the UPS11.
  • the reactor 21a and the switch 21b are connected in series between the input terminal T11 and the output terminal T14.
  • Reactor 22a and switch 22b are connected in series between input terminal T12 and output terminal T14.
  • Reactor 23a and switch 23b are connected in series between input terminal T131 and output terminal T14.
  • the reactors 21a, 22a, and 23a are provided as reactors for suppressing cross flow.
  • the switches 21b, 22b, 23b are circuit breakers, for example.
  • the switches 21a, 22a, and 23a are always turned on, and turned off during maintenance (including updating) of the corresponding UPS, for example.
  • the maintenance bypass panel 30 includes a bypass input terminal T21, an input terminal T22, at least one (three in the drawing) output terminals T23-T25, and switches 31-35.
  • the bypass input terminal T21 is connected to the commercial AC power supply 1 via the maintenance bypass circuit 6 and the switch 15.
  • the switch 15 is always turned off, and turned on, for example, during maintenance of the UPSs 11-13.
  • the input terminal T22 is connected to the output terminal T14 of the parallel board 20.
  • Output terminals T23, T24 and T25 are connected to loads 50a, 50b and 50c, respectively.
  • the switch 31 has a first terminal connected to the bypass input terminal T21 and a second terminal connected to the first terminals of the switches 33-35.
  • the switch 32 has a first terminal connected to the input terminal T22 and a second terminal connected to the first terminals of the switches 33-35.
  • the second terminals of switches 33-35 are connected to output terminals T23-T25, respectively.
  • the switch 31 is always turned off, and turned on, for example, during maintenance of the UPSs 11-13.
  • the switch 32 is always on, and is turned off during maintenance of the UPS 11-13, for example.
  • Each of the switches 33-35 is always turned on, and turned off during maintenance of the corresponding load, for example.
  • the test parallel board 40 is used for UPS parallel tests, which will be described later.
  • the test parallel board 40 includes a first terminal T31, a second terminal T32, and a reactor 41 connected between the terminals T31 and T32.
  • the reactor 41 is provided as a reactor for suppressing cross flow during the parallel test.
  • the test parallel board 40 corresponds to an embodiment of "connection circuit” and "second parallel board”.
  • FIG. 2 is a diagram showing the operating state of the uninterruptible power supply system 100 during normal times. As shown in FIG. 2, the switches 16 to 18, 21b to 23b, and 32 to 35 are normally turned on, and the switches 15 and 31 are turned off.
  • Each of the UPSs 11 to 13 receives AC power from a commercial AC power supply 1, and controls a power converter (converter 2 and inverter 3) to supply commercial-frequency AC power, as indicated by a thick solid line in the figure. It generates and outputs the generated AC power to the output terminal T3.
  • AC power output from UPS 11-13 is supplied to loads 50a-50c via a plurality of switches included in parallel board 20 and maintenance bypass board 30.
  • the control circuits 7 of the UPS 11-13 are connected by a communication cable 8 to form one control device.
  • This controller controls the parallel operation of the UPSs 11-13. Specifically, the controller controls the inverters 3 of the UPSs 11-13 based on the currents flowing through the loads 50a, 50b, and 50c. In addition, the control device controls the operating UPS so that the output voltage and output current of the operating UPS are equal to each other.
  • the uninterruptible power supply system 100 is configured to obtain redundancy by connecting a plurality of UPSs 11 to 13 in parallel to the load. It is called an uninterruptible power supply system.
  • N UPSs are required for power supply by the uninterruptible power supply system 100
  • power supply quality can be improved by implementing (N+1) UPSs for redundancy.
  • the present embodiment provides an update method that enables UPS update and parallel testing without securing empty space for temporary placement of a new UPS and without the need to install new communication cables. It provides.
  • the existing UPS is replaced with a new UPS one by one while continuing to supply power to the load. Then, the newly installed UPS is operated in parallel with other existing UPSs, and a parallel test is carried out to confirm whether or not there is an abnormality in the parallel operation control.
  • control circuit 7 of each of the UPSs 11-13 is communicably connected by the communication cable 8. Therefore, when updating the UPS, it is necessary to reconnect the communication cable 8 from the existing UPS to the new UPS in addition to replacing the existing UPS with the new UPS.
  • FIG. 3 is a diagram explaining the communication cable 8 that connects the UPSs 11-13.
  • FIG. 3 schematically shows three control circuits 7 and a communication cable 8 included in each of the UPSs 11-13.
  • FIG. 3A shows the wiring of the communication cable 8 during parallel operation of the UPSs 11-13.
  • control circuit 7 includes a plurality of terminals CAA, CAB, ECAA, ECAB and processor 9 .
  • Control circuit 7 further includes a memory (not shown).
  • the control circuit 7 can perform the above-described parallel operation control by software processing in which the processor 9 executes a program stored in memory in advance.
  • part or all of the parallel operation control can be realized by hardware processing using a built-in dedicated electronic circuit instead of software processing.
  • Each of the terminals CAA, CAB, ECAA, and ECAB is configured so that connectors 81 and 82 provided at both ends of the communication cable 8 can be connected.
  • Terminals CAA and CAB are connected to each other and to the processor 9 .
  • Terminals CAA and CAB are used to communicatively connect the control circuit 7 to the control circuit 7 of another UPS.
  • Terminals ECAA and ECAB are spare terminals.
  • Terminals ECAA and ECAB are connected to each other and to the processor 9 .
  • a terminating resistor E is used to terminate the end of the communication cable 8 .
  • the control circuit 7 of the UPS 11 and the control circuit 7 of the UPS 12 are connected by a communication cable 8. Specifically, connector 81 of communication cable 8 is connected to terminal CAB of UPS 11 , and connector 82 is connected to terminal CAA of UPS 12 . Since the terminal CAA of the UPS 11 is not used, a terminating resistor E is connected to it.
  • the control circuit 7 of the UPS 12 and the control circuit 7 of the UPS 13 are connected by a communication cable 8. Specifically, connector 81 of communication cable 8 is connected to terminal CAB of UPS 12 , and connector 82 is connected to terminal CAA of UPS 13 . Since the terminal CAB of the UPS 13 is not used, a terminating resistor E is connected to it. With the wiring shown in FIG. 3A, the control circuits 7 (processors 9) of the UPSs 11 to 13 can be connected with the communication cables 8 to form the control device described above. In each of the UPSs 11, 12, 13, spare terminals ECAA, ECAB are not used.
  • FIG. 1 the procedure for updating the UPS 11 will be explained using FIGS. 3 to 10.
  • FIG. 1 the major flow is shown below.
  • UPS 11 to 13 are operated in parallel to supply power to the load (initial state).
  • UPS 11 and another UPS for example, UPS 12 are stopped and disconnected.
  • UPS 12 is turned on in parallel and started, and UPS 12 and 13 are operated in parallel.
  • UPSs 11 and 12 are connected in parallel and activated to return to the initial state.
  • the UPS 11 and UPS 12 are disconnected from the parallel operation of the UPS 11-13.
  • the UPS 13 is maintained in an operating state, so the UPS 13 continues to supply power to the loads 50a to 50c.
  • a terminating resistor E is connected to the terminal CAB, and the terminating resistor E is connected to the terminal CAA via the communication cable 8 and the terminals CAB and CAA of the UPS 12 .
  • the UPS 13 alone can continue to operate.
  • UPS12 is connected in parallel with UPS13.
  • the UPS 12 and 13 are operated in parallel by the control circuit 7 of the UPS 12 controlling the power converter (the converter 2 and the inverter 3) so as to start the UPS 12 and synchronize with the output of the UPS 13 in the operating state ( See Figure 7).
  • the UPS 11 installs a new UPS. Further, the communication cable 8 is connected between the UPSs 11 and 122 by inserting the connector 81 of the communication cable 8 into the terminal CAB of the new UPS. During work, the UPSs 12, 13 are kept in operation, and the UPSs 12, 13 supply power to the loads 50a-50c.
  • This step is performed to connect the UPS 11 and UPS 12 and disconnect the communication connection between the UPS 12 and UPS 13 .
  • the connection destination of the connector 82 of the communication cable 8 is changed from the terminal ECAA to the terminal CAB.
  • the connection destination of the connector 81 of the communication cable 8 is changed from the terminal CAB to the terminal ECAA.
  • the terminating resistor E is connected to the terminal CAB, and the terminating resistor E is connected to the terminal CAA via the communication cable 8 and the terminals ECAA and ECAB of the UPS 12. Therefore, the UPS 13 can be operated alone. can be continued.
  • the terminals CAB are connected to each other via the communication cable 8, so that parallel operation is possible.
  • test parallel board 40 (reactor 41) is connected between output terminal T3 of UPS 11 and output terminal T3 of UPS 12 do. In this state, the UPSs 11 and 12 are activated and a parallel test is performed. During the parallel test, the UPS 13 remains in operation and the loads 50a-50c are being supplied by the UPS 13.
  • each of the UPSs 11 and 12 performs no-load operation.
  • control circuit 7 controls the corresponding power converter so that the output voltages (phase and amplitude) of UPS 11, 12 are equal to each other.
  • no current flows between the output terminals T3 of the UPSs 11 and 12.
  • the output voltages of the UPSs 11 and 12 are different (at least one of phase and amplitude is different)
  • a current flows between the output terminals T3 of the UPSs 11 and 12. Therefore, based on whether a current (cross current) flows between the output terminals T3 of the UPSs 11, 12, it can be confirmed whether the parallel operation control of the UPSs 11, 12 is normally performed.
  • the reactor 41 has a function of suppressing cross currents during parallel operation.
  • the parallel test may be configured to be performed with a simulated load connected to the output terminals T3 of the UPSs 11 and 12 instead of the no-load operation. In this case, based on whether the output current of the UPS 11 and the output current of the UPS 12 are in balance, it can be confirmed whether the parallel operation control of the UPSs 11 and 12 is being performed normally.
  • UPS 11, 12 startup/parallel connection Next, referring to FIG. 5(D) and FIG.
  • the UPSs 11 and 12 are connected in parallel to the UPS 13 in operation. Furthermore, the control circuit 7 of the UPS 11, 12 controls the power converters (converter 2 and inverter 3) so as to activate the UPS 11, 12 and synchronize with the output of the UPS 13 in the operating state. As a result, the UPSs 11 to 13 are initialized, and parallel operation of the UPSs 11 to 13 is performed (see FIG. 10).
  • one UPS to be updated and another UPS are By disconnecting from parallel operation and connecting a cross current suppression reactor between the output terminals of these two UPSs, while continuing to supply power to the load, the UPS is updated and the parallel test is performed on the two UPSs. and can be implemented. Therefore, a plurality of UPSs can be updated one by one and a parallel test can be performed while continuing to supply power to the load. According to this, there is no need to secure empty space for temporary installation of all the new UPSs, and it is not necessary to procure new communication cables. becomes possible.
  • a communication cable for communication connection between a plurality of control circuits is used to connect communication between the control circuits of the two UPSs while updating one UPS.
  • the wiring of the communication cable so as to cut off the communication between the control circuit and the control circuit of the other UPS, the power supply to the load by the other UPS and the parallel test for the two UPSs can be performed in parallel. It is possible to execute
  • FIG. 11 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to the first modified example.
  • uninterruptible power supply system 100 according to the first modification is different from uninterruptible power supply system 100 shown in FIG. They are different in terms of preparation.
  • the parallel board 20A is obtained by adding reactors 41a and 41b and switches 42a and 42b to the parallel board 20 of FIG.
  • Reactor 41a and switch 42a are connected in series between input terminal T11 and input terminal T12.
  • Reactor 41b and switch 42b are connected in series between input terminal T12 and input terminal T13.
  • Reactors 41a, 41b and switches 42a, 42b correspond to an example of a "connection circuit”.
  • Switches 42a and 42b correspond to one embodiment of a "fourth switch.”
  • the switch 42a is turned off while the switches 21b, 22b, and 23b are turned on.
  • the switch 42a is turned on when the switches 21b and 22b are turned off and the switch 23b is turned on.
  • the reactor 41a is connected between the output terminal T3 of the UPS 11 and the output terminal T3 of the UPS 12, so that the UPSs 11 and 12 can be tested in parallel.
  • the switch 42b is turned off while the switches 21b, 22b, and 23b are turned on.
  • the switch 42b is turned on when the switches 22b and 23b are turned off and the switch 21b is turned on.
  • the reactor 41b is connected between the output terminal T3 of the UPS 12 and the output terminal T3 of the UPS 13, so that the UPSs 12 and 13 can be tested in parallel.
  • FIG. 12 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to the second modified example.
  • uninterruptible power supply system 100 according to a second modification is different from uninterruptible power supply system 100 shown in FIG. They are different in terms of preparation.
  • a parallel board 20B is obtained by adding switches 43a and 43b to the parallel board 20 of FIG.
  • Switch 43a is connected between a connection node of reactor 21a and switch 21b and a connection node of reactor 22a and switch 22b.
  • Switch 43b is connected between a connection node of reactor 22a and switch 22b and a connection node of reactor 23a and switch 23b.
  • Reactors 21a, 22a, 23a and switches 43a, 43b correspond to an embodiment of the "connection circuit”.
  • Switches 43a and 43b correspond to one embodiment of the "fourth switch”.
  • the switch 43a is turned off while the switches 21b, 22b, and 23b are turned on.
  • the switch 43a is turned on when the switches 21b and 22b are turned off and the switch 23b is turned on.
  • Reactors 21a and 22a are connected in series between output terminal T3 of UPS 11 and output terminal T3 of UPS 12 by turning on switch 43a. Since the series circuit of the reactors 21a and 22a functions as a reactor for suppressing the cross current, the UPSs 11 and 12 can be tested in parallel.
  • the switch 43b is turned off while the switches 21b, 22b, and 23b are turned on.
  • the switch 43b is turned on when the switches 22b and 23b are turned off and the switch 21b is turned on.
  • Reactors 22a and 23a are connected in series between output terminal T3 of UPS 12 and output terminal T3 of UPS 13 by turning on switch 43b. Since the series circuit of the reactors 22a and 23a functions as a reactor for suppressing the cross current, the UPSs 12 and 13 can be tested in parallel.
  • UPSs a parallel redundant uninterruptible power supply system including three UPSs was described, but in the uninterruptible power supply system according to the present disclosure, the The number of UPSs may be three or more.

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Abstract

An uninterruptible power supply system (100) comprises a plurality of UPSs, a plurality of switches for connecting the plurality of UPSs in parallel with loads, and a connection circuit (40). The UPSs each include: a power converter (3) for generating an AC voltage having a predetermine frequency; and an output terminal (T3) for outputting the AC voltage generated by the power converter. The plurality of switches include a first switch (21b) connected between the output terminal of a first UPS (11) and the loads, a second switch (22b) connected between the output terminal of a second UPS (12) and the loads, and a third switch (23b) connected between the output terminal of a third UPS (13) and the loads. The connection circuit (40) is configured so that a reactor (41) is connected between the output terminal of the first UPS and the output terminal of the second UPS in a state in which the first and second switches are turned off and the third switch is turned on.

Description

無停電電源システムおよび無停電電源システムの更新方法Uninterruptible power system and how to update an uninterruptible power system
　本開示は、無停電電源システムおよび無停電電源システムの更新方法に関する。 The present disclosure relates to an uninterruptible power supply system and an update method for the uninterruptible power supply system.
　特開２０１７－５０９３３号公報（特許文献１）には、並列冗長方式の無停電電源システムが開示される。並列冗長方式の無停電電源システムは、負荷に対して並列接続された複数の無停電電源装置（ＵＰＳ：Uninterruptible　Power　Supply）を備えている。 Japanese Patent Laying-Open No. 2017-50933 (Patent Document 1) discloses a parallel redundant uninterruptible power supply system. A parallel redundant uninterruptible power supply system includes a plurality of uninterruptible power supplies (UPSs) connected in parallel to loads.
特開２０１７－５０９３３号公報JP 2017-50933 A
　上記並列冗長方式の無停電電源システムにおいて、複数の既設ＵＰＳの各々を新設ＵＰＳに更新する場合には、更新された複数のＵＰＳの並列運転制御に異常がないかを確認するための試験（以下、「並列試験」とも称する）を実施する必要がある。その一方で、ＵＰＳの更新作業中においても、負荷への給電を継続させることが求められる。 In the above parallel redundant uninterruptible power supply system, when each of the existing UPS is updated to a new UPS, a test (hereinafter referred to as , also referred to as “parallel testing”). On the other hand, it is required to continue supplying power to the load even during the updating work of the UPS.
　そのため、従来、負荷への給電を継続しながら並列試験を実施するために、新設ＵＰＳのすべてを既設ＵＰＳとは別のスペースに仮置きし、並列試験を実施して並列運転に異常がないかを確認する作業が行われていた。そして、この作業を終了した後に、既設ＵＰＳを停止して撤去する作業と、新設ＵＰＳによる給電への切り換え作業とが行われていた。 Therefore, conventionally, in order to conduct a parallel test while continuing to supply power to the load, the new UPS is temporarily placed in a separate space from the existing UPS, and a parallel test is performed to check for any abnormalities in parallel operation. Work was being done to confirm After completing this work, the work of stopping and removing the existing UPS and the work of switching to power feeding by the new UPS were performed.
　上述した手順では、現地に新設ＵＰＳのすべてを仮置きするための空きスペースが必要とされるため、空きスペースがない場合には更新作業が困難となることが懸念される。また、新設ＵＰＳを既設ＵＰＳとは別のスペースに仮置きして運転可能状態とする必要があるため、本来であれば流用可能である通信ケーブルも新規に調達して配設しなければならず、工事費用が嵩んでしまうことが懸念される。 　In the above-mentioned procedure, there is a concern that it will be difficult to perform the update work if there is no free space, as free space is required to temporarily place all of the newly installed UPS on site. In addition, since it is necessary to temporarily place the new UPS in a separate space from the existing UPS and make it operable, it is necessary to newly procure and install a communication cable that can be diverted. , there is a concern that the construction cost will increase.
　本開示は上述のような課題を解決するためになされたものであって、本開示の目的は、並列冗長方式の無停電電源システムにおいて、負荷への給電を継続しながら無停電電源装置を１台ずつ更新および並列試験の実施を可能とすることである。 The present disclosure has been made to solve the problems described above, and an object of the present disclosure is to provide a parallel redundant uninterruptible power supply system in which one uninterruptible power supply device is connected while continuing to supply power to a load. It is to allow for machine-by-machine upgrades and parallel testing.
　本開示の一態様に係る無停電電源システムは、第１から第３の無停電電源装置を含む複数の無停電電源装置と、複数の無停電電源装置を負荷に対して並列に接続するための複数のスイッチとを備える。複数の無停電電源装置の各々は、所定周波数の交流電圧を生成する電力変換器と、電力変換器により生成された交流電圧を出力する出力端子とを含む。複数のスイッチは、第１の無停電電源装置の出力端子と負荷との間に接続される第１のスイッチと、第２の無停電電源装置の出力端子と負荷との間に接続される第２のスイッチと、第３の無停電電源装置の出力端子と負荷との間に接続される第３のスイッチとを含む。無停電電源システムは、接続回路をさらに備える。接続回路は、第１および第２のスイッチがオフされ、かつ、第３のスイッチがオンされた状態において、第１の無停電電源装置の出力端子と第２の無停電電源装置の出力端子との間にリアクトルを接続するように構成される。 An uninterruptible power supply system according to one aspect of the present disclosure includes a plurality of uninterruptible power supply apparatuses including first to third uninterruptible power supply apparatuses, and a plurality of uninterruptible power supply apparatuses for connecting in parallel to a load. and a plurality of switches. Each of the plurality of uninterruptible power supplies includes a power converter that generates AC voltage with a predetermined frequency, and an output terminal that outputs the AC voltage generated by the power converter. The plurality of switches include a first switch connected between the output terminal of the first uninterruptible power supply and the load, and a second switch connected between the output terminal of the second uninterruptible power supply and the load. 2 switches and a third switch connected between the output terminal of the third uninterruptible power supply and the load. The uninterruptible power system further comprises connection circuitry. The connection circuit connects the output terminal of the first uninterruptible power supply and the output terminal of the second uninterruptible power supply in a state where the first and second switches are turned off and the third switch is turned on. configured to connect a reactor between
　本開示の別の態様に係る無停電電源システムの更新方法は、各々が出力端子を有する第１から第３の無停電電源装置と、第１から第３の無停電電源装置の出力端子を負荷にそれぞれ接続するための第１から第３のスイッチとを含む無停電電源システムの更新方法である。第１から第３の無停電電源装置の各々は、電力変換器を含み、電力変換器により生成された所定周波数の交流電圧を出力端子に出力するように構成される。更新方法は、第１から第３のスイッチがオンした状態で第１から第３の無停電電源装置が並列運転している場合において、第１および第２の無停電電源装置の運転を停止し、かつ、第１および第２のスイッチをオフするステップと、第１の無停電電源装置において、既設の無停電電源装置を新設の無停電電源装置に更新するステップと、更新された第１の無停電電源装置の出力端子と、第２の無停電電源装置の出力端子との間にリアクトルを接続するステップと、互いに等しい交流電圧を出力端子に出力するように第１および第２の無停電電源装置の各々の電力変換器を制御することにより、第１および第２の無停電電源装置の並列試験を実施するステップと、並列試験の実施後に、第１および第２の無停電電源装置の運転を停止し、第１および第２の無停電電源装置からリアクトルを取り外すステップと、第１および第２のスイッチをオンし、第１および第２の無停電電源装置を起動させることにより、第１から第３の無停電電源装置を並列運転させるステップとを備える。 An update method for an uninterruptible power supply system according to another aspect of the present disclosure includes first to third uninterruptible power supply devices each having an output terminal; and first to third switches for respectively connecting to the uninterruptible power supply system. Each of the first to third uninterruptible power supplies includes a power converter and is configured to output to an output terminal an AC voltage of a predetermined frequency generated by the power converter. The update method stops the operation of the first and second uninterruptible power supply systems when the first to third uninterruptible power supply systems are operating in parallel with the first to third switches turned on. and turning off the first and second switches; in the first uninterruptible power supply, updating the existing uninterruptible power supply to a newly installed uninterruptible power supply; and connecting a reactor between the output terminal of the uninterruptible power supply and the output terminal of the second uninterruptible power supply; performing a parallel test of the first and second uninterruptible power supplies by controlling the power converter of each of the power supplies; By stopping the operation and removing the reactors from the first and second uninterruptible power supply systems, turning on the first and second switches to start the first and second uninterruptible power supply systems, and operating the first to third uninterruptible power supplies in parallel.
　本開示によれば、並列冗長方式の無停電電源システムにおいて、負荷への給電を継続しながら無停電電源装置を１台ずつ更新および並列試験を実施することができる。 According to the present disclosure, in a parallel redundant uninterruptible power supply system, it is possible to update and test parallel uninterruptible power supply units one by one while continuing to supply power to the load.
実施の形態に係る無停電電源システムの構成の一例を示す回路ブロック図である。It is a circuit block diagram showing an example of composition of an uninterruptible power supply system concerning an embodiment. 通常時における無停電電源システムの運用状態を示す図である。It is a figure which shows the operation state of an uninterruptible power supply system at the time of normal. ＵＰＳ間を繋ぐ通信ケーブルを説明する図である。It is a figure explaining the communication cable which connects between UPS. ＵＰＳを更新する手順を説明する図である。It is a figure explaining the procedure which updates UPS. ＵＰＳを更新する手順を説明する図である。It is a figure explaining the procedure which updates UPS. 既設ＵＰＳを停止および解列する工程を説明する図である。FIG. 10 is a diagram illustrating a process of stopping and paralleling off an existing UPS; 既設ＵＰＳを撤去する工程を説明する図である。It is a figure explaining the process of removing existing UPS. 新設ＵＰＳを据え付ける工程を説明する図である。It is a figure explaining the process of installing new UPS. 並列試験を実施する工程を説明する図である。It is a figure explaining the process of implementing a parallel test. 並列試験後のＵＰＳを並列投入する工程を説明する図である。FIG. 10 is a diagram illustrating a process of parallel loading UPSs after a parallel test; 第１の変更例に係る無停電電源システムの構成を示す回路ブロック図である。FIG. 10 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to a first modified example; 第２の変更例に係る無停電電源システムの構成を示す回路ブロック図である。FIG. 9 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to a second modification;
　以下、図面を参照しつつ、本開示の実施の形態について説明する。以下の説明では、同一の部品および構成要素には同一の符号を付してある。それらの名称および機能も同じである。したがって、これらについての詳細な説明は原則的には繰り返さない。 Embodiments of the present disclosure will be described below with reference to the drawings. In the following description, identical parts and components are given identical reference numerals. Their names and functions are also the same. Therefore, detailed description of these will not be repeated in principle.
　＜無停電電源システムの構成＞
　図１は、実施の形態に係る無停電電源システムの構成の一例を示す回路ブロック図である。 <Configuration of uninterruptible power supply system>
FIG. 1 is a circuit block diagram showing an example of the configuration of an uninterruptible power supply system according to an embodiment.
　図１を参照して、無停電電源システム１００は、複数（図では３つ）の無停電電源装置（ＵＰＳ：Uninterruptible　Power　Supply）１１～１３と、複数のスイッチ１５～１８と、保守バイパス回路６と、並列盤２０と、保守バイパス盤３０と、試験並列盤４０とを備える。 Referring to FIG. 1, an uninterruptible power supply system 100 includes a plurality of (three in the figure) uninterruptible power supplies (UPS: Uninterruptible Power Supply) 11-13, a plurality of switches 15-18, and a maintenance bypass circuit 6. , a parallel board 20 , a maintenance bypass board 30 , and a test parallel board 40 .
　ＵＰＳ１１は、入力端子Ｔ１、バッテリ端子Ｔ２、出力端子Ｔ３、コンバータ２、インバータ３、バイパス切換回路５、および制御回路７を含む。 The UPS 11 includes an input terminal T1, a battery terminal T2, an output terminal T3, a converter 2, an inverter 3, a bypass switching circuit 5, and a control circuit 7.
　入力端子Ｔ１は、商用交流電源１から商用周波数の交流電力を受ける。バッテリ端子Ｔ２はバッテリ４に接続される。バッテリ４は直流電力を蓄える。バッテリ４の代わりにコンデンサが接続されていても構わない。出力端子Ｔ３は、並列盤２０および保守バイパス盤３０を介して負荷５０ａ～５０ｃに接続される。 The input terminal T1 receives commercial-frequency AC power from the commercial AC power supply 1. Battery terminal T2 is connected to battery 4 . A battery 4 stores DC power. A capacitor may be connected instead of the battery 4 . The output terminal T3 is connected to the loads 50a-50c through the parallel board 20 and the maintenance bypass board 30. FIG.
　スイッチ１６は、例えば遮断器であり、商用交流電源１と入力端子Ｔ１との間に接続される。スイッチ１６は、商用交流電源１から交流電力が供給されている通常時はオンされ、商用交流電源１からの交流電力が停止された停電時はオフされる。 The switch 16 is, for example, a breaker, and is connected between the commercial AC power supply 1 and the input terminal T1. The switch 16 is normally turned on when the AC power is supplied from the commercial AC power supply 1, and is turned off when the AC power from the commercial AC power supply 1 is stopped.
　コンバータ２は、商用交流電源１からスイッチ１６を介して商用周波数の交流電力を受け、制御回路７によって制御される。コンバータ２は、通常時は、商用交流電源１からスイッチ１６を介して供給される交流電力を直流電力に変換して直流ラインに出力する。コンバータ２の出力電圧は、所望の値に制御可能になっている。商用交流電源１の停電時には、コンバータ２の運転は停止される。 The converter 2 receives commercial-frequency AC power from the commercial AC power supply 1 via the switch 16 and is controlled by the control circuit 7 . The converter 2 normally converts the AC power supplied from the commercial AC power supply 1 via the switch 16 into DC power and outputs the DC power to the DC line. The output voltage of converter 2 can be controlled to a desired value. When the commercial AC power supply 1 fails, the operation of the converter 2 is stopped.
　インバータ３は、直流ラインに接続され、制御回路７によって制御される。インバータ３は、コンバータ２から直流ラインを介して供給される直流電力を商用周波数の交流電力に変換して出力する。インバータ３で生成された交流電力は、出力端子Ｔ３、並列盤２０および保守バイパス盤３０を介して負荷５０ａ～５０ｃに与えられる。インバータ３は、通常時には、コンバータ２から供給される直流電力を交流電力に変換し、商用交流電源１の停電時には、バッテリ４から供給される直流電力を交流電力に変換する。インバータ３の出力電圧は、所望の値に制御可能になっている。 The inverter 3 is connected to the DC line and controlled by the control circuit 7 . The inverter 3 converts the DC power supplied from the converter 2 through the DC line into AC power of commercial frequency and outputs the AC power. AC power generated by inverter 3 is applied to loads 50a-50c via output terminal T3, parallel board 20 and maintenance bypass board 30. FIG. The inverter 3 normally converts the DC power supplied from the converter 2 into AC power, and converts the DC power supplied from the battery 4 into AC power during a power failure of the commercial AC power supply 1 . The output voltage of the inverter 3 can be controlled to a desired value.
　バイパス切換回路５は、入力端子Ｔ１と出力端子Ｔ３との間に接続され、制御回路７によって制御される。バイパス切換回路５は、インバータ３によって生成された交流電力を負荷に供給するインバータ給電モード時はオフされ、商用交流電源１から負荷に交流電力を供給するバイパス給電モード時にはオンされる。 The bypass switching circuit 5 is connected between the input terminal T1 and the output terminal T3 and controlled by the control circuit 7. Bypass switching circuit 5 is turned off in an inverter power supply mode in which AC power generated by inverter 3 is supplied to a load, and is turned on in a bypass power supply mode in which AC power is supplied from commercial AC power supply 1 to a load.
　制御回路７は、通常時は、コンバータ２およびインバータ３を制御して商用周波数の交流電力を生成させ、停電時には、コンバータ２の運転を停止するとともにインバータ３を制御して商用周波数の交流電力を生成させる。 Control circuit 7 normally controls converter 2 and inverter 3 to generate commercial-frequency AC power, and in the event of a power failure, stops operation of converter 2 and controls inverter 3 to generate commercial-frequency AC power. generate.
　ＵＰＳ１２，１３の各々は、ＵＰＳ１１と同じ構成である。スイッチ１７は、商用交流電源１とＵＰＳ１２の入力端子Ｔ１との間に接続される。スイッチ１８は、商用交流電源１とＵＰＳ１３の入力端子Ｔ１との間に接続される。スイッチ１７，１８は、通常時はオンされ、商用交流電源１の停電時はオフされる。 Each of UPS 12 and 13 has the same configuration as UPS 11. Switch 17 is connected between commercial AC power supply 1 and input terminal T1 of UPS 12 . Switch 18 is connected between commercial AC power supply 1 and input terminal T1 of UPS 13 . The switches 17 and 18 are normally turned on, and turned off when the commercial AC power supply 1 fails.
　ＵＰＳ１１～１３の各々の制御回路７は通信ケーブル８によって互いに接続されており、通信ケーブル８を介してＵＰＳ１１～１３の間で情報の授受を行う。各制御回路７は、複数のＵＰＳ１１～１３の分担電流が等しくなるように、対応するコンバータ２およびインバータ３を制御する。 The control circuits 7 of the UPSs 11-13 are connected to each other by a communication cable 8, and information is exchanged between the UPSs 11-13 via the communication cable 8. Each control circuit 7 controls the corresponding converter 2 and inverter 3 so that the shared currents of the plurality of UPSs 11-13 are equal.
　また、制御回路７は、対応するＵＰＳを停止状態にさせる場合には、対応するコンバータ２およびインバータ３の運転を停止させ、対応するＵＰＳを運転状態にさせる場合は対応するコンバータ２およびインバータ３の運転を継続させる。 Control circuit 7 stops operation of corresponding converter 2 and inverter 3 when the corresponding UPS is to be stopped, and stops operation of corresponding converter 2 and inverter 3 when the corresponding UPS is to be put into the operating state. continue driving.
　並列盤２０は、入力端子Ｔ１１～Ｔ１３と、出力端子Ｔ１４と、リアクトル２１ａ，２２ａ，２３ａと、スイッチ２１ｂ，２２ｂ，２３ｂとを含む。並列盤２０は「第１の並列盤」および「並列盤」の一実施例に対応する。 The parallel board 20 includes input terminals T11 to T13, an output terminal T14, reactors 21a, 22a and 23a, and switches 21b, 22b and 23b. Parallel board 20 corresponds to an embodiment of "first parallel board" and "parallel board".
　入力端子Ｔ１１は、ＵＰＳ１１の出力端子Ｔ３に接続される。入力端子Ｔ１２は、ＵＰＳ１２の出力端子Ｔ３に接続される。入力端子Ｔ１３は、ＵＰＳ１１の出力端子Ｔ３に接続される。 The input terminal T11 is connected to the output terminal T3 of the UPS11. The input terminal T12 is connected to the output terminal T3 of the UPS12. The input terminal T13 is connected to the output terminal T3 of the UPS11.
　リアクトル２１ａおよびスイッチ２１ｂは、入力端子Ｔ１１と出力端子Ｔ１４との間に直列に接続される。リアクトル２２ａおよびスイッチ２２ｂは、入力端子Ｔ１２と出力端子Ｔ１４との間に直列に接続される。リアクトル２３ａおよびスイッチ２３ｂは、入力端子Ｔ１３１と出力端子Ｔ１４との間に直列に接続される。 The reactor 21a and the switch 21b are connected in series between the input terminal T11 and the output terminal T14. Reactor 22a and switch 22b are connected in series between input terminal T12 and output terminal T14. Reactor 23a and switch 23b are connected in series between input terminal T131 and output terminal T14.
　リアクトル２１ａ，２２ａ，２３ａは横流抑制用のリアクトルとして設けられる。スイッチ２１ｂ，２２ｂ，２３ｂは、例えば遮断器である。スイッチ２１ａ，２２ａ，２３ａは、常時オンされ、例えば、対応するＵＰＳのメンテナンス時（更新時を含む）にそれぞれオフされる。 The reactors 21a, 22a, and 23a are provided as reactors for suppressing cross flow. The switches 21b, 22b, 23b are circuit breakers, for example. The switches 21a, 22a, and 23a are always turned on, and turned off during maintenance (including updating) of the corresponding UPS, for example.
　保守バイパス盤３０は、バイパス入力端子Ｔ２１と、入力端子Ｔ２２と、少なくとも１つ（図では３つ）の出力端子Ｔ２３～Ｔ２５と、スイッチ３１～３５とを含む。 The maintenance bypass panel 30 includes a bypass input terminal T21, an input terminal T22, at least one (three in the drawing) output terminals T23-T25, and switches 31-35.
　バイパス入力端子Ｔ２１は、保守バイパス回路６およびスイッチ１５を介して商用交流電源１に接続される。スイッチ１５は、常時オフされ、例えば、ＵＰＳ１１～１３のメンテナンス時にオンされる。 The bypass input terminal T21 is connected to the commercial AC power supply 1 via the maintenance bypass circuit 6 and the switch 15. The switch 15 is always turned off, and turned on, for example, during maintenance of the UPSs 11-13.
　入力端子Ｔ２２は、並列盤２０の出力端子Ｔ１４に接続される。出力端子Ｔ２３，Ｔ２４，Ｔ２５は負荷５０ａ，５０ｂ，５０ｃにそれぞれ接続される。 The input terminal T22 is connected to the output terminal T14 of the parallel board 20. Output terminals T23, T24 and T25 are connected to loads 50a, 50b and 50c, respectively.
　スイッチ３１は、第１の端子がバイパス入力端子Ｔ２１に接続され、第２の端子がスイッチ３３～３５の第１の端子に接続される。スイッチ３２は、第１の端子が入力端子Ｔ２２に接続され、第２の端子がスイッチ３３～３５の第１の端子に接続される。スイッチ３３～３５の第２の端子は、出力端子Ｔ２３～Ｔ２５にそれぞれ接続される。 The switch 31 has a first terminal connected to the bypass input terminal T21 and a second terminal connected to the first terminals of the switches 33-35. The switch 32 has a first terminal connected to the input terminal T22 and a second terminal connected to the first terminals of the switches 33-35. The second terminals of switches 33-35 are connected to output terminals T23-T25, respectively.
　スイッチ３１は、常時オフされ、例えば、ＵＰＳ１１～１３のメンテナンス時にオンされる。スイッチ３２は、常時オンされ、例えば、ＵＰＳ１１～１３のメンテナンス時にオフされる。スイッチ３３～３５の各々は、常時オンされ、例えば、対応する負荷のメンテナンス時にオフされる。 The switch 31 is always turned off, and turned on, for example, during maintenance of the UPSs 11-13. The switch 32 is always on, and is turned off during maintenance of the UPS 11-13, for example. Each of the switches 33-35 is always turned on, and turned off during maintenance of the corresponding load, for example.
　試験並列盤４０は、後述するＵＰＳの並列試験に用いられる。試験並列盤４０は、第１の端子Ｔ３１と、第２の端子Ｔ３２と、端子Ｔ３１，Ｔ３２の間に接続されるリアクトル４１とを含む。リアクトル４１は、並列試験中の横流抑制用のリアクトルとして設けられる。試験並列盤４０は「接続回路」および「第２の並列盤」の一実施例に対応する。 The test parallel board 40 is used for UPS parallel tests, which will be described later. The test parallel board 40 includes a first terminal T31, a second terminal T32, and a reactor 41 connected between the terminals T31 and T32. The reactor 41 is provided as a reactor for suppressing cross flow during the parallel test. The test parallel board 40 corresponds to an embodiment of "connection circuit" and "second parallel board".
　次に、図１に示した無停電電源システム１００の動作を説明する。
　図２は、通常時における無停電電源システム１００の運用状態を示す図である。図２に示すように、通常時には、スイッチ１６～１８，２１ｂ～２３ｂ，３２～３５がオンされ、スイッチ１５，３１がオフされる。 Next, the operation of the uninterruptible power supply system 100 shown in FIG. 1 will be described.
FIG. 2 is a diagram showing the operating state of the uninterruptible power supply system 100 during normal times. As shown in FIG. 2, the switches 16 to 18, 21b to 23b, and 32 to 35 are normally turned on, and the switches 15 and 31 are turned off.
　ＵＰＳ１１～１３の各々は、図中に太実線で示されるように、商用交流電源１から交流電力の供給を受け、電力変換器（コンバータ２およびインバータ３）を制御して商用周波数の交流電力を生成し、生成した交流電力を出力端子Ｔ３に出力する。ＵＰＳ１１～１３から出力される交流電力は、並列盤２０および保守バイパス盤３０に含まれる複数のスイッチを経由して負荷５０ａ～５０ｃに供給される。 Each of the UPSs 11 to 13 receives AC power from a commercial AC power supply 1, and controls a power converter (converter 2 and inverter 3) to supply commercial-frequency AC power, as indicated by a thick solid line in the figure. It generates and outputs the generated AC power to the output terminal T3. AC power output from UPS 11-13 is supplied to loads 50a-50c via a plurality of switches included in parallel board 20 and maintenance bypass board 30. FIG.
　ＵＰＳ１１～１３の制御回路７は、通信ケーブル８で結合されて１つの制御装置を構成する。この制御装置は、ＵＰＳ１１～１３の並列運転を制御する。具体的には、制御装置は、負荷５０ａ，５０ｂ，５０ｃに流れる電流に基づいて、ＵＰＳ１１～１３のインバータ３を制御する。また、制御装置は、運転中のＵＰＳの出力電圧および出力電流が互いに等しくなるように、運転中のＵＰＳを制御する。 The control circuits 7 of the UPS 11-13 are connected by a communication cable 8 to form one control device. This controller controls the parallel operation of the UPSs 11-13. Specifically, the controller controls the inverters 3 of the UPSs 11-13 based on the currents flowing through the loads 50a, 50b, and 50c. In addition, the control device controls the operating UPS so that the output voltage and output current of the operating UPS are equal to each other.
　以上説明したように、本実施の形態に係る無停電電源システム１００は、複数のＵＰＳ１１～１３を負荷に対して並列に接続して冗長性を得るように構成されるため、「並列冗長方式の無停電電源システム」と称される。無停電電源システム１００による電源供給にＮ台のＵＰＳが必要な場合、（Ｎ＋１）台のＵＰＳを実装して冗長化を図ることにより、電源品質を向上させることができる。 As described above, the uninterruptible power supply system 100 according to the present embodiment is configured to obtain redundancy by connecting a plurality of UPSs 11 to 13 in parallel to the load. It is called an uninterruptible power supply system. When N UPSs are required for power supply by the uninterruptible power supply system 100, power supply quality can be improved by implementing (N+1) UPSs for redundancy.
　並列冗長方式の無停電電源システムにおいて、複数のＵＰＳを既設ＵＰＳから新設ＵＰＳに更新する場合には、更新された複数のＵＰＳの並列運転制御に異常がないかを確認するための試験（以下、「並列試験」とも称する）を実施する必要がある。その一方で、ＵＰＳの更新作業中においても、負荷への給電を継続させることが求められる。そのため、従来、負荷への給電を継続しつつ並列試験を実施するために、以下の手順に従って更新作業が行われていた。 In a parallel redundant uninterruptible power supply system, when updating multiple UPSs from existing UPSs to new UPSs, a test (hereinafter referred to as (also referred to as “parallel testing”) must be performed. On the other hand, it is required to continue supplying power to the load even during the updating work of the UPS. Therefore, conventionally, in order to perform a parallel test while continuing to supply power to the load, update work has been performed according to the following procedure.
　（１）新設ＵＰＳのすべてを既設ＵＰＳとは別のスペースに仮置きし、並列試験を実施して並列運転制御に異常がないかを確認する。 (1) Temporarily place all of the new UPS in a separate space from the existing UPS, and conduct a parallel test to check if there is any abnormality in the parallel operation control.
　（２）負荷給電している既設ＵＰＳを一旦保守バイパス給電とし、その間に新設ＵＰＳへ負荷を切り換え、新設ＵＰＳによる負荷給電状態とする。 (2) Once the existing UPS that is feeding the load is switched to maintenance bypass feeding, the load is switched to the new UPS during this time, and the load is fed by the new UPS.
　（３）既設ＵＰＳを停止かつ撤去し、別の仮置きスペースに移設して、再び運転可能状態に復旧する。 (3) Stop and remove the existing UPS, move it to another temporary storage space, and restore it to an operable state.
　（４）負荷給電している新設ＵＰＳから保守バイパス給電を介して仮設の既設ＵＰＳによる給電に切り換え、新設ＵＰＳを停止する。 (4) Switch from the newly installed UPS that is supplying power to the temporary existing UPS via the maintenance bypass power supply, and stop the newly installed UPS.
　（５）停止中の新設ＵＰＳを仮設場所から正規の据え付け場所に移設する。
　（６）仮設の既設ＵＰＳによる給電から新設ＵＰＳによる給電へ切り換え作業を行う。 (5) Move the newly installed UPS that is stopped from the temporary location to the regular installation location.
(6) Work to switch power supply from the existing temporary UPS to power supply by the new UPS.
　（７）停止状態の既設ＵＰＳを仮設場所から撤去する。
　上述した手順では、現地に新設ＵＰＳのすべてを仮置きするための空きスペースが必要とされるため、現地に空きスペースを確保できない場合には更新作業が困難となることが懸念される。また、新設ＵＰＳを既設ＵＰＳとは別のスペースに仮置きして運転可能状態とする必要があるため、本来であれば流用可能である通信ケーブルも新規に調達して配設しなければならず、工事費用が嵩んでしまうことが懸念される。 (7) Remove the existing stopped UPS from the temporary location.
In the above-described procedure, an empty space is required to temporarily place all of the newly installed UPSs at the site, so there is a concern that the update work will be difficult if the empty space cannot be secured at the site. In addition, since it is necessary to temporarily place the new UPS in a separate space from the existing UPS and make it operable, it is necessary to newly procure and install a communication cable that can be diverted. , there is a concern that the construction cost will increase.
　本実施の形態は、新設ＵＰＳを仮置きするための空きスペースの確保、および、新規の通信ケーブルの配設を必要とすることなく、ＵＰＳの更新および並列試験の実施を可能とする更新方法を提供するものである。 The present embodiment provides an update method that enables UPS update and parallel testing without securing empty space for temporary placement of a new UPS and without the need to install new communication cables. It provides.
　＜無停電電源システムの更新方法＞
　次に、図１に示した無停電電源システム１００におけるＵＰＳの更新方法について説明する。以下の説明では、一例として、３台のＵＰＳ１１～１３の並列運転（図２参照）の実行中にＵＰＳ１１を更新する手順について説明する。すなわち、本例では、ＵＰＳ１１は「第１の無停電電源装置」に対応し、ＵＰＳ１２は「第２の無停電電源装置」に対応し、ＵＰＳ１３は「第３の無停電電源装置」に対応する。 <How to update the uninterruptible power supply system>
Next, a method for updating the UPS in the uninterruptible power supply system 100 shown in FIG. 1 will be described. In the following description, as an example, a procedure for updating the UPS 11 during parallel operation of three UPSs 11 to 13 (see FIG. 2) will be described. That is, in this example, the UPS 11 corresponds to the "first uninterruptible power supply", the UPS 12 corresponds to the "second uninterruptible power supply", and the UPS 13 corresponds to the "third uninterruptible power supply". .
　本実施の形態では、以下に述べるように、負荷への給電を継続しながら、ＵＰＳを１台ずつ既設ＵＰＳから新設ＵＰＳに取り替える。そして、この新設ＵＰＳを他の既設ＵＰＳと並列運転させて並列試験を実施し、並列運転制御に異常がないかを確認する。 In this embodiment, as described below, the existing UPS is replaced with a new UPS one by one while continuing to supply power to the load. Then, the newly installed UPS is operated in parallel with other existing UPSs, and a parallel test is carried out to confirm whether or not there is an abnormality in the parallel operation control.
　上述したように、ＵＰＳ１１～１３の各々の制御回路７は、通信ケーブル８によって通信可能に接続されている。したがって、ＵＰＳの更新においては、既設ＵＰＳを新設ＵＰＳに取り替える作業に併せて、通信ケーブル８を既設ＵＰＳから新設ＵＰＳに接続し直す作業が必要となる。 As described above, the control circuit 7 of each of the UPSs 11-13 is communicably connected by the communication cable 8. Therefore, when updating the UPS, it is necessary to reconnect the communication cable 8 from the existing UPS to the new UPS in addition to replacing the existing UPS with the new UPS.
　図３は、ＵＰＳ１１～１３間を繋ぐ通信ケーブル８を説明する図である。図３には、ＵＰＳ１１～１３にそれぞれ含まれる３つの制御回路７と、通信ケーブル８とが模式的に示されている。図３（Ａ）は、ＵＰＳ１１～１３の並列運転時における通信ケーブル８の配線を示している。 FIG. 3 is a diagram explaining the communication cable 8 that connects the UPSs 11-13. FIG. 3 schematically shows three control circuits 7 and a communication cable 8 included in each of the UPSs 11-13. FIG. 3A shows the wiring of the communication cable 8 during parallel operation of the UPSs 11-13.
　図３（Ａ）を参照して、制御回路７は、複数の端子ＣＡＡ，ＣＡＢ，ＥＣＡＡ，ＥＣＡＢと、プロセッサ９とを含む。制御回路７は、図示しないメモリをさらに含む。制御回路７は、予めメモリに格納されたプログラムをプロセッサ９が実行するソフトウェア処理によって、上述した並列運転制御を実行することができる。あるいは、並列運転制御の一部または全部について、ソフトウェア処理に代えて、内蔵された専用の電子回路などを用いたハードウェア処理によって実現することも可能である。 Referring to FIG. 3A, control circuit 7 includes a plurality of terminals CAA, CAB, ECAA, ECAB and processor 9 . Control circuit 7 further includes a memory (not shown). The control circuit 7 can perform the above-described parallel operation control by software processing in which the processor 9 executes a program stored in memory in advance. Alternatively, part or all of the parallel operation control can be realized by hardware processing using a built-in dedicated electronic circuit instead of software processing.
　端子ＣＡＡ，ＣＡＢ，ＥＣＡＡ，ＥＣＡＢの各々は、通信ケーブル８の両端に設けられたコネクタ８１，８２を接続することが可能に構成されている。端子ＣＡＡ，ＣＡＢは、互いに接続され、かつ、プロセッサ９に接続されている。端子ＣＡＡ，ＣＡＢは、制御回路７を他のＵＰＳの制御回路７に通信接続するために用いられる。端子ＥＣＡＡ，ＥＣＡＢは、予備用の端子である。端子ＥＣＡＡ，ＥＣＡＢは互いに接続され、かつ、プロセッサ９に接続されている。終端抵抗Ｅは、通信ケーブル８の端部を終端させるために用いられる。 Each of the terminals CAA, CAB, ECAA, and ECAB is configured so that connectors 81 and 82 provided at both ends of the communication cable 8 can be connected. Terminals CAA and CAB are connected to each other and to the processor 9 . Terminals CAA and CAB are used to communicatively connect the control circuit 7 to the control circuit 7 of another UPS. Terminals ECAA and ECAB are spare terminals. Terminals ECAA and ECAB are connected to each other and to the processor 9 . A terminating resistor E is used to terminate the end of the communication cable 8 .
　ＵＰＳ１１の制御回路７とＵＰＳ１２の制御回路７とは通信ケーブル８によって接続されている。具体的には、通信ケーブル８のコネクタ８１はＵＰＳ１１の端子ＣＡＢに接続され、コネクタ８２はＵＰＳ１２の端子ＣＡＡに接続されている。ＵＰＳ１１の端子ＣＡＡは不使用のため、終端抵抗Ｅが接続されている。 The control circuit 7 of the UPS 11 and the control circuit 7 of the UPS 12 are connected by a communication cable 8. Specifically, connector 81 of communication cable 8 is connected to terminal CAB of UPS 11 , and connector 82 is connected to terminal CAA of UPS 12 . Since the terminal CAA of the UPS 11 is not used, a terminating resistor E is connected to it.
　ＵＰＳ１２の制御回路７とＵＰＳ１３の制御回路７とは通信ケーブル８によって接続されている。具体的には、通信ケーブル８のコネクタ８１はＵＰＳ１２の端子ＣＡＢに接続され、コネクタ８２はＵＰＳ１３の端子ＣＡＡに接続されている。ＵＰＳ１３の端子ＣＡＢは不使用のため、終端抵抗Ｅが接続されている。図３（Ａ）に示す配線によって、ＵＰＳ１１～１３の制御回路７（プロセッサ９）は、通信ケーブル８で結合されて上述した制御装置を構成することができる。ＵＰＳ１１，１２，１３の各々において、予備用の端子ＥＣＡＡ，ＥＣＡＢは不使用となっている。 The control circuit 7 of the UPS 12 and the control circuit 7 of the UPS 13 are connected by a communication cable 8. Specifically, connector 81 of communication cable 8 is connected to terminal CAB of UPS 12 , and connector 82 is connected to terminal CAA of UPS 13 . Since the terminal CAB of the UPS 13 is not used, a terminating resistor E is connected to it. With the wiring shown in FIG. 3A, the control circuits 7 (processors 9) of the UPSs 11 to 13 can be connected with the communication cables 8 to form the control device described above. In each of the UPSs 11, 12, 13, spare terminals ECAA, ECAB are not used.
　次に、図３から図１０を用いて、ＵＰＳ１１を更新する手順を説明する。まず、大きな流れを以下に示す。 Next, the procedure for updating the UPS 11 will be explained using FIGS. 3 to 10. FIG. First, the major flow is shown below.
　（１）ＵＰＳ１１～１３を並列運転して負荷に給電している状態とする（初期状態）。
　（２）ＵＰＳ１１および他の１台のＵＰＳ（例えばＵＰＳ１２）を停止、解列させる。 (1) The UPS 11 to 13 are operated in parallel to supply power to the load (initial state).
(2) UPS 11 and another UPS (for example, UPS 12) are stopped and disconnected.
　（３）ＵＰＳ１１，１２間の通信ケーブル８の接続を変更する。
　（４）ＵＰＳ１２を並列投入かつ起動し、ＵＰＳ１２，１３を並列運転させる。 (3) Change the connection of the communication cable 8 between the UPSs 11 and 12.
(4) UPS 12 is turned on in parallel and started, and UPS 12 and 13 are operated in parallel.
　（５）ＵＰＳ１１にて、停止状態の既設ＵＰＳを撤去する。
　（６）ＵＰＳ１１にて、新設ＵＰＳを据え付ける。 (5) At the UPS 11, remove the existing UPS that is in a stopped state.
(6) Install a new UPS at the UPS 11 .
　（７）ＵＰＳ１２を停止、解列させる。
　（８）ＵＰＳ１１～１３間の通信ケーブル８の接続を変更する。 (7) Stop and disconnect the UPS 12 .
(8) Change the connection of the communication cable 8 between the UPSs 11-13.
　（９）ＵＰＳ１１，１２間に試験並列盤４０を接続し、並列試験を実施する。
　（１０）ＵＰＳ１１，１２を停止する。 (9) Connect the test parallel board 40 between the UPSs 11 and 12 to perform a parallel test.
(10) Stop the UPSs 11 and 12.
　（１１）ＵＰＳ１１～１３間の通信ケーブル８の接続を変更する。
　（１２）ＵＰＳ１１，１２を並列投入かつ起動し、初期状態に戻す。 (11) Change the connection of the communication cable 8 between the UPSs 11-13.
(12) UPSs 11 and 12 are connected in parallel and activated to return to the initial state.
　次に、上記（２）から（１２）の各々の工程について説明する。なお、（１）の初期状態については図２に示されているため、説明を省略する。 Next, each step from (2) to (12) above will be described. Since the initial state of (1) is shown in FIG. 2, the description is omitted.
　（２）ＵＰＳ１１，１２の停止・解列
　図３（Ｂ）および図６を参照して、ＵＰＳ１１～１３の並列運転中、更新対象のＵＰＳ１１および、２台のＵＰＳ１２，１３のうちの１台のＵＰＳ（図ではＵＰＳ１２）の運転を停止させる。具体的には、ＵＰＳ１１，１２の各々において、制御回路７はコンバータ２およびインバータ３の運転を停止させ、対応するＵＰＳを停止状態とする。 (2) Stopping/disconnecting UPSs 11 and 12 Referring to FIGS. 3B and 6, during parallel operation of UPSs 11 to 13, UPS 11 to be updated and one of the two UPSs 12 and 13 Stop the operation of the UPS (UPS 12 in the figure). Specifically, in each of UPSs 11 and 12, control circuit 7 stops operation of converter 2 and inverter 3 to bring the corresponding UPS into a stopped state.
　さらに、スイッチ１１，１２をオフするとともに、並列盤２０内のスイッチ２１ｂ，２２ｂをオフすることにより、ＵＰＳ１１～１３の並列運転からＵＰＳ１１，ＵＰＳ１２を解列させる。なお、図６中に太実線で示されるように、ＵＰＳ１３は運転状態に維持されているため、ＵＰＳ１３によって負荷５０ａ～５０ｃへの給電が継続されている。 Furthermore, by turning off the switches 11 and 12 and turning off the switches 21b and 22b in the parallel board 20, the UPS 11 and UPS 12 are disconnected from the parallel operation of the UPS 11-13. As indicated by the thick solid line in FIG. 6, the UPS 13 is maintained in an operating state, so the UPS 13 continues to supply power to the loads 50a to 50c.
　（３）通信ケーブル８の接続変更
　次に、図３（Ｃ）に示すように、ＵＰＳ１１，１２を停止状態に維持し、ＵＰＳ１１，１２間を繋ぐ通信ケーブル８の接続を変更する。この工程は、ＵＰＳ１３の運転を確保しつつ、ＵＰＳ１１とＵＰＳ１３との通信接続を遮断するために行われる。具体的には、通信ケーブル８のコネクタ８１をＵＰＳ１１の端子ＣＡＢから引き抜くとともに、コネクタ８２をＵＰＳ１２の端子ＣＡＡから端子ＥＣＡＡに差し替える。さらに、ＵＰＳ１２の端子ＣＡＡ，ＥＣＡＢに終端抵抗Ｅを接続する。ＵＰＳ１３においては、端子ＣＡＢに終端抵抗Ｅが接続されるとともに、端子ＣＡＡには通信ケーブル８、ＵＰＳ１２の端子ＣＡＢ，ＣＡＡを介して終端抵抗Ｅが接続される。これにより、ＵＰＳ１３単体で運転を継続することができる。 (3) Connection Change of Communication Cable 8 Next, as shown in FIG. 3C, the UPSs 11 and 12 are maintained in a stopped state, and the connection of the communication cable 8 connecting the UPSs 11 and 12 is changed. This process is performed to cut off the communication connection between the UPS 11 and the UPS 13 while ensuring the operation of the UPS 13 . Specifically, the connector 81 of the communication cable 8 is pulled out from the terminal CAB of the UPS 11, and the connector 82 is replaced from the terminal CAA of the UPS 12 to the terminal ECAA. Furthermore, a terminating resistor E is connected to the terminals CAA and ECAB of the UPS 12 . In the UPS 13 , a terminating resistor E is connected to the terminal CAB, and the terminating resistor E is connected to the terminal CAA via the communication cable 8 and the terminals CAB and CAA of the UPS 12 . As a result, the UPS 13 alone can continue to operate.
　（４）ＵＰＳ１２，１３の並列運転
　次に、図３（Ｄ）および図７を参照して、ＵＰＳ１１，１２間の通信ケーブル８の接続を変更した後に、スイッチ１２，２２ｂをオンすることにより、ＵＰＳ１２をＵＰＳ１３に並列接続させる。 (4) Parallel operation of UPSs 12 and 13 Next, referring to FIGS. UPS12 is connected in parallel with UPS13.
　さらに、ＵＰＳ１２を起動させて、運転状態のＵＰＳ１３の出力と同期するように、ＵＰＳ１２の制御回路７が電力変換器（コンバータ２およびインバータ３）を制御することにより、ＵＰＳ１２，１３を並列運転させる（図７参照）。 Furthermore, the UPS 12 and 13 are operated in parallel by the control circuit 7 of the UPS 12 controlling the power converter (the converter 2 and the inverter 3) so as to start the UPS 12 and synchronize with the output of the UPS 13 in the operating state ( See Figure 7).
　（５）既設ＵＰＳの撤去
　次に、図４（Ａ）および図７を参照して、ＵＰＳ１２，１３の並列運転の実行中において、ＵＰＳ１１では、通信ケーブル８を抜き取り、既設ＵＰＳを撤去する。 (5) Removal of Existing UPS Next, referring to FIGS. 4A and 7, during parallel operation of the UPSs 12 and 13, the UPS 11 unplugs the communication cable 8 and removes the existing UPS.
　（６）新設ＵＰＳの据え付け
　次に、図４（Ｂ）を参照して、ＵＰＳ１１にて、新設ＵＰＳを据え付ける。さらに、通信ケーブル８のコネクタ８１を新設ＵＰＳの端子ＣＡＢに挿入することにより、ＵＰＳ１１，１２２間に通信ケーブル８を接続する。作業中、ＵＰＳ１２，１３は運転状態に維持されており、ＵＰＳ１２，１３によって負荷５０ａ～５０ｃへの給電が行われている。 (6) Installation of new UPS Next, referring to FIG. 4B, the UPS 11 installs a new UPS. Further, the communication cable 8 is connected between the UPSs 11 and 122 by inserting the connector 81 of the communication cable 8 into the terminal CAB of the new UPS. During work, the UPSs 12, 13 are kept in operation, and the UPSs 12, 13 supply power to the loads 50a-50c.
　（７）ＵＰＳ１２の停止・解列
　次に、図４（Ｃ）および図８を参照して、ＵＰＳ１２の運転を停止させる。さらに、スイッチ１２，２２ｂをオフすることにより、ＵＰＳ１２，１３の並列回路からＵＰＳ１２を解列させる。 (7) Stop/Disconnection of UPS 12 Next, referring to FIG. 4(C) and FIG. 8, the operation of the UPS 12 is stopped. Furthermore, the UPS 12 is disconnected from the parallel circuit of the UPSs 12 and 13 by turning off the switches 12 and 22b.
　（８）通信ケーブル８の接続変更
　次に、図４（Ｄ）を参照して、ＵＰＳ１１，１２間の通信ケーブル８の接続を変更するとともに、ＵＰＳ１２，１３間の通信ケーブル８の接続を変更する。この工程は、ＵＰＳ１１とＵＰＳ１２とを通信接続するとともに、ＵＰＳ１２とＵＰＳ１３との通信接続を遮断するために行われる。具体的には、ＵＰＳ１２において、通信ケーブル８のコネクタ８２の接続先を端子ＥＣＡＡから端子ＣＡＢに変更する。また、通信ケーブル８のコネクタ８１の接続先を端子ＣＡＢから端子ＥＣＡＡに変更する。これによると、ＵＰＳ１３においては、端子ＣＡＢに終端抵抗Ｅが接続されるとともに、端子ＣＡＡには通信ケーブル８、ＵＰＳ１２の端子ＥＣＡＡ，ＥＣＡＢを介して終端抵抗Ｅが接続されるため、ＵＰＳ１３単体で運転を継続することができる。また、ＵＰＳ１１およびＵＰＳ１２においては、各々の端子ＣＡＢ同士が通信ケーブル８を介して接続されたことによって、並列運転が可能な状態となる。 (8) Change of connection of communication cable 8 Next, referring to FIG. . This step is performed to connect the UPS 11 and UPS 12 and disconnect the communication connection between the UPS 12 and UPS 13 . Specifically, in the UPS 12, the connection destination of the connector 82 of the communication cable 8 is changed from the terminal ECAA to the terminal CAB. Also, the connection destination of the connector 81 of the communication cable 8 is changed from the terminal CAB to the terminal ECAA. According to this, in the UPS 13, the terminating resistor E is connected to the terminal CAB, and the terminating resistor E is connected to the terminal CAA via the communication cable 8 and the terminals ECAA and ECAB of the UPS 12. Therefore, the UPS 13 can be operated alone. can be continued. Also, in the UPS 11 and the UPS 12, the terminals CAB are connected to each other via the communication cable 8, so that parallel operation is possible.
　（９）ＵＰＳ１１，１２の並列試験
　次に、図５（Ａ）および図９を参照して、ＵＰＳ１１の出力端子Ｔ３とＵＰＳ１２の出力端子Ｔ３との間に試験並列盤４０（リアクトル４１）を接続する。この状態でＵＰＳ１１，１２を起動させて並列試験を実施する。並列試験中、ＵＰＳ１３は運転状態に維持されており、ＵＰＳ１３によって負荷５０ａ～５０ｃへの給電が行われている。 (9) Parallel test of UPS 11 and 12 Next, referring to FIGS. 5A and 9, test parallel board 40 (reactor 41) is connected between output terminal T3 of UPS 11 and output terminal T3 of UPS 12 do. In this state, the UPSs 11 and 12 are activated and a parallel test is performed. During the parallel test, the UPS 13 remains in operation and the loads 50a-50c are being supplied by the UPS 13.
　並列試験中、ＵＰＳ１１，１２の各々は無負荷運転を実行する。ＵＰＳ１１，１２の各々において、制御回路７は、ＵＰＳ１１，１２の出力電圧（位相および振幅）が互いに等しくなるように、対応する電力変換器を制御する。ＵＰＳ１１，１２の出力電圧が互いに等しい場合には、ＵＰＳ１１，１２の出力端子Ｔ３の間に電流が流れない。一方、ＵＰＳ１１，１２の出力電圧が異なる場合（位相および振幅の少なくとも一方が異なる場合）には、ＵＰＳ１１，１２の出力端子Ｔ３の間に電流が流れる。したがって、ＵＰＳ１１，１２の出力端子Ｔ３間に電流（横流）が流れるか否かに基づいて、ＵＰＳ１１，１２の並列運転制御が正常に行なわれているか否かを確認することができる。リアクトル４１は、並列運転中の横流を抑制する機能を有する。 　During the parallel test, each of the UPSs 11 and 12 performs no-load operation. In each of UPS 11, 12, control circuit 7 controls the corresponding power converter so that the output voltages (phase and amplitude) of UPS 11, 12 are equal to each other. When the output voltages of the UPSs 11 and 12 are equal to each other, no current flows between the output terminals T3 of the UPSs 11 and 12. On the other hand, when the output voltages of the UPSs 11 and 12 are different (at least one of phase and amplitude is different), a current flows between the output terminals T3 of the UPSs 11 and 12. Therefore, based on whether a current (cross current) flows between the output terminals T3 of the UPSs 11, 12, it can be confirmed whether the parallel operation control of the UPSs 11, 12 is normally performed. The reactor 41 has a function of suppressing cross currents during parallel operation.
　なお、並列試験は、無負荷運転に代えて、ＵＰＳ１１，１２の出力端子Ｔ３に模擬負荷を接続した状態で実施する構成としてもよい。この場合、ＵＰＳ１１の出力電流とＵＰＳ１２の出力電流とがバランスしているか否かに基づいて、ＵＰＳ１１，１２の並列運転制御が正常に行われているか否かを確認することができる。 Note that the parallel test may be configured to be performed with a simulated load connected to the output terminals T3 of the UPSs 11 and 12 instead of the no-load operation. In this case, based on whether the output current of the UPS 11 and the output current of the UPS 12 are in balance, it can be confirmed whether the parallel operation control of the UPSs 11 and 12 is being performed normally.
　（１０）ＵＰＳ１１，１２の停止
　次に、図５（Ｂ）を参照して、並列運転を実行した後に、ＵＰＳ１１，１２の運転を停止させる。さらに、ＵＰＳ１１の出力端子Ｔ３およびＵＰＳ１２の出力端子Ｔ３から試験並列盤４０（リアクトル４１）を取り外す。 (10) Stopping UPSs 11 and 12 Next, referring to FIG. 5B, the UPSs 11 and 12 are stopped after the parallel operation is executed. Further, the test parallel board 40 (reactor 41) is removed from the output terminal T3 of the UPS11 and the output terminal T3 of the UPS12.
　（１１）通信ケーブル８の接続変更
　次に、図５（Ｃ）を参照して、ＵＰＳ１１，１２間の通信ケーブル８の接続を変更するとともに、ＵＰＳ１２，１３間の通信ケーブル８の接続を変更することにより、配線を初期状態（図３（Ａ）参照）に戻す。この工程は、ＵＰＳ１１～１３の制御回路７を通信接続するために行われる。具体的には、ＵＰＳ１２において、通信ケーブル８のコネクタ８２の接続先を端子ＥＣＡＢから端子ＣＡＡに変更する。また、通信ケーブル８のコネクタ８１の接続先を端子ＥＣＡＡから端子ＣＡＢに変更する。この配線によって、ＵＰＳ１１～１３の制御回路７（プロセッサ９）は、通信ケーブル８で結合されて再び制御装置を構成することができる。 (11) Change of connection of communication cable 8 Next, referring to FIG. Thus, the wiring is returned to the initial state (see FIG. 3A). This step is performed to connect the control circuits 7 of the UPSs 11-13 for communication. Specifically, in the UPS 12, the connection destination of the connector 82 of the communication cable 8 is changed from the terminal ECAB to the terminal CAA. Also, the connection destination of the connector 81 of the communication cable 8 is changed from the terminal ECAA to the terminal CAB. With this wiring, the control circuits 7 (processors 9) of the UPSs 11 to 13 can be connected by communication cables 8 to constitute the control device again.
　（１２）ＵＰＳ１１，１２の起動・並列投入
　次に、図５（Ｄ）および図１０を参照して、スイッチ１６，１７をオンするとともに、並列盤２０のスイッチ２１ｂ，２２ｂをオンすることにより、ＵＰＳ１１，１２を運転状態のＵＰＳ１３に並列接続する。さらに、ＵＰＳ１１，１２を起動させて、運転状態のＵＰＳ１３の出力と同期するように、ＵＰＳ１１，１２の制御回路７が電力変換器（コンバータ２およびインバータ３）を制御する。これにより、ＵＰＳ１１～１３は初期状態となり、ＵＰＳ１１～１３の並列運転が行われる（図１０参照）。 (12) UPS 11, 12 startup/parallel connection Next, referring to FIG. 5(D) and FIG. The UPSs 11 and 12 are connected in parallel to the UPS 13 in operation. Furthermore, the control circuit 7 of the UPS 11, 12 controls the power converters (converter 2 and inverter 3) so as to activate the UPS 11, 12 and synchronize with the output of the UPS 13 in the operating state. As a result, the UPSs 11 to 13 are initialized, and parallel operation of the UPSs 11 to 13 is performed (see FIG. 10).
　なお、上述した手順によってＵＰＳ１１の更新を終えると、同じ手順を繰り返すことによって、ＵＰＳ１２，１３の各々の更新および並列試験を順次実行する。なお、ＵＰＳ１２の更新作業中はＵＰＳ１１，１３のいずれか一方を運転状態に維持し、ＵＰＳ１３の更新作業中はＵＰＳ１１，１２のいずれか一方を運転状態に維持する。これにより、すべてのＵＰＳの更新が完了するまでの間、負荷への給電を継続することが可能となる。 After completing the update of the UPS 11 according to the procedure described above, the same procedure is repeated to successively execute the update and parallel test of each of the UPSs 12 and 13. It should be noted that either one of the UPSs 11 and 13 is maintained in operation while the UPS 12 is being updated, and either one of the UPSs 11 and 12 is maintained in operation while the UPS 13 is being updated. This allows the load to continue to be powered until all UPS updates are complete.
　以上説明したように、本実施の形態に係る並列冗長方式の無停電電源システムによれば、３台以上のＵＰＳの並列運転中に、更新対象の１台のＵＰＳおよび他の１台のＵＰＳを並列運転から解列させて、これら２台のＵＰＳの出力端子間に横流抑制用のリアクトルを接続することにより、負荷への給電を継続しながら、ＵＰＳの更新と当該２台のＵＰＳに対する並列試験とを実施することができる。したがって、負荷への給電を継続しながら、複数のＵＰＳを１台ずつ更新して並列試験を実施することができる。これによると、新設ＵＰＳのすべてを仮置きするための空きスペースの確保、および、新規の通信ケーブルの調達が不要となるため、限られたスペースおよび工事費用で無停電電源システムの更新作業を行うことが可能となる。 As described above, according to the parallel redundant uninterruptible power supply system according to the present embodiment, during parallel operation of three or more UPSs, one UPS to be updated and another UPS are By disconnecting from parallel operation and connecting a cross current suppression reactor between the output terminals of these two UPSs, while continuing to supply power to the load, the UPS is updated and the parallel test is performed on the two UPSs. and can be implemented. Therefore, a plurality of UPSs can be updated one by one and a parallel test can be performed while continuing to supply power to the load. According to this, there is no need to secure empty space for temporary installation of all the new UPSs, and it is not necessary to procure new communication cables. becomes possible.
　また、複数の制御回路間を通信接続するための通信ケーブルを、１台のＵＰＳの更新作業中は、上記２台のＵＰＳの制御回路の間を通信接続する一方で、当該２台のＵＰＳの制御回路と他のＵＰＳの制御回路との通信を遮断するように、通信ケーブルの配線を変更することにより、他のＵＰＳによる負荷への給電と、当該２台のＵＰＳに対する並列試験とを並行して実行することが可能となる。 In addition, a communication cable for communication connection between a plurality of control circuits is used to connect communication between the control circuits of the two UPSs while updating one UPS. By changing the wiring of the communication cable so as to cut off the communication between the control circuit and the control circuit of the other UPS, the power supply to the load by the other UPS and the parallel test for the two UPSs can be performed in parallel. It is possible to execute
　＜その他の構成例＞
　上述した実施の形態では、並列試験のためにＵＰＳ１１，１２の出力端子Ｔ３間に接続されるリアクトル４１を、並列盤２０と別体の試験並列盤４０により構成する例について説明したが、以下に例示するように、リアクトル４１を並列盤２０と一体に構成してもよい。 <Other configuration examples>
In the above-described embodiment, an example was described in which the reactor 41 connected between the output terminals T3 of the UPSs 11 and 12 for the parallel test was configured by the parallel board 20 and the separate test parallel board 40. As illustrated, the reactor 41 may be configured integrally with the parallel board 20 .
　図１１は、第１の変更例に係る無停電電源システムの構成を示す回路ブロック図である。図１１を参照して、第１の変更例に係る無停電電源システム１００は、図１に示した無停電電源システム１００とは、試験並列盤４０および並列盤２０に代えて、並列盤２０Ａを備える点が異なる。 FIG. 11 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to the first modified example. Referring to FIG. 11, uninterruptible power supply system 100 according to the first modification is different from uninterruptible power supply system 100 shown in FIG. They are different in terms of preparation.
　並列盤２０Ａは、図１の並列盤２０に対して、リアクトル４１ａ，４１ｂと、スイッチ４２ａ，４２ｂとを追加したものである。リアクトル４１ａおよびスイッチ４２ａは、入力端子Ｔ１１と入力端子Ｔ１２との間に直列に接続される。リアクトル４１ｂおよびスイッチ４２ｂは、入力端子Ｔ１２と入力端子Ｔ１３との間に直列に接続される。リアクトル４１ａ，４１ｂおよびスイッチ４２ａ，４２ｂは「接続回路」の一実施例に対応する。スイッチ４２ａ，４２ｂは「第４のスイッチ」の一実施例に対応する。 The parallel board 20A is obtained by adding reactors 41a and 41b and switches 42a and 42b to the parallel board 20 of FIG. Reactor 41a and switch 42a are connected in series between input terminal T11 and input terminal T12. Reactor 41b and switch 42b are connected in series between input terminal T12 and input terminal T13. Reactors 41a, 41b and switches 42a, 42b correspond to an example of a "connection circuit". Switches 42a and 42b correspond to one embodiment of a "fourth switch."
　スイッチ４２ａは、スイッチ２１ｂ，２２ｂ，２３ｂがオンされた状態においてオフされる。スイッチ４２ａは、スイッチ２１ｂ，２２ｂがオフされ、かつ、スイッチ２３ｂがオンされた状態においてオンされる。スイッチ４２ａがオンされることによって、ＵＰＳ１１の出力端子Ｔ３とＵＰＳ１２の出力端子Ｔ３との間にリアクトル４１ａが接続されるため、ＵＰＳ１１，１２に対する並列試験を実施することができる。 The switch 42a is turned off while the switches 21b, 22b, and 23b are turned on. The switch 42a is turned on when the switches 21b and 22b are turned off and the switch 23b is turned on. By turning on the switch 42a, the reactor 41a is connected between the output terminal T3 of the UPS 11 and the output terminal T3 of the UPS 12, so that the UPSs 11 and 12 can be tested in parallel.
　スイッチ４２ｂは、スイッチ２１ｂ，２２ｂ，２３ｂがオンされた状態においてオフされる。スイッチ４２ｂは、スイッチ２２ｂ，２３ｂがオフされ、かつ、スイッチ２１ｂがオンされた状態においてオンされる。スイッチ４２ｂがオンされることによって、ＵＰＳ１２の出力端子Ｔ３とＵＰＳ１３の出力端子Ｔ３との間にリアクトル４１ｂが接続されるため、ＵＰＳ１２，１３に対する並列試験を実施することができる。 The switch 42b is turned off while the switches 21b, 22b, and 23b are turned on. The switch 42b is turned on when the switches 22b and 23b are turned off and the switch 21b is turned on. By turning on the switch 42b, the reactor 41b is connected between the output terminal T3 of the UPS 12 and the output terminal T3 of the UPS 13, so that the UPSs 12 and 13 can be tested in parallel.
　図１２は、第２の変更例に係る無停電電源システムの構成を示す回路ブロック図である。図１２を参照して、第２の変更例に係る無停電電源システム１００は、図１に示した無停電電源システム１００とは、試験並列盤４０および並列盤２０に代えて、並列盤２０Ｂを備える点が異なる。 FIG. 12 is a circuit block diagram showing the configuration of an uninterruptible power supply system according to the second modified example. Referring to FIG. 12, uninterruptible power supply system 100 according to a second modification is different from uninterruptible power supply system 100 shown in FIG. They are different in terms of preparation.
　並列盤２０Ｂは、図１の並列盤２０に対して、スイッチ４３ａ、４３ｂを追加したものである。スイッチ４３ａは、リアクトル２１ａおよびスイッチ２１ｂの接続ノードと、リアクトル２２ａおよびスイッチ２２ｂの接続ノードとの間に接続される。スイッチ４３ｂは、リアクトル２２ａおよびスイッチ２２ｂの接続ノードと、リアクトル２３ａおよびスイッチ２３ｂの接続ノードとの間に接続される。リアクトル２１ａ，２２ａ，２３ａおよびスイッチ４３ａ，４３ｂは「接続回路」の一実施例に対応する。スイッチ４３ａ，４３ｂは「第４のスイッチ」の一実施例に対応する。 A parallel board 20B is obtained by adding switches 43a and 43b to the parallel board 20 of FIG. Switch 43a is connected between a connection node of reactor 21a and switch 21b and a connection node of reactor 22a and switch 22b. Switch 43b is connected between a connection node of reactor 22a and switch 22b and a connection node of reactor 23a and switch 23b. Reactors 21a, 22a, 23a and switches 43a, 43b correspond to an embodiment of the "connection circuit". Switches 43a and 43b correspond to one embodiment of the "fourth switch".
　スイッチ４３ａは、スイッチ２１ｂ，２２ｂ，２３ｂがオンされた状態においてオフされる。スイッチ４３ａは、スイッチ２１ｂ，２２ｂがオフされ、かつ、スイッチ２３ｂがオンされた状態においてオンされる。スイッチ４３ａがオンされることによって、ＵＰＳ１１の出力端子Ｔ３とＵＰＳ１２の出力端子Ｔ３との間にリアクトル２１ａ，２２ａが直列に接続されることになる。リアクトル２１ａ，２２ａの直列回路が横流抑制用のリアクトルとして機能するため、ＵＰＳ１１，１２に対する並列試験を実施することができる。 The switch 43a is turned off while the switches 21b, 22b, and 23b are turned on. The switch 43a is turned on when the switches 21b and 22b are turned off and the switch 23b is turned on. Reactors 21a and 22a are connected in series between output terminal T3 of UPS 11 and output terminal T3 of UPS 12 by turning on switch 43a. Since the series circuit of the reactors 21a and 22a functions as a reactor for suppressing the cross current, the UPSs 11 and 12 can be tested in parallel.
　スイッチ４３ｂは、スイッチ２１ｂ，２２ｂ，２３ｂがオンされた状態においてオフされる。スイッチ４３ｂは、スイッチ２２ｂ，２３ｂがオフされ、かつ、スイッチ２１ｂがオンされた状態においてオンされる。スイッチ４３ｂがオンされることによって、ＵＰＳ１２の出力端子Ｔ３とＵＰＳ１３の出力端子Ｔ３との間にリアクトル２２ａ，２３ａが直列に接続されることになる。リアクトル２２ａ，２３ａの直列回路が横流抑制用のリアクトルとして機能するため、ＵＰＳ１２，１３に対する並列試験を実施することができる。 The switch 43b is turned off while the switches 21b, 22b, and 23b are turned on. The switch 43b is turned on when the switches 22b and 23b are turned off and the switch 21b is turned on. Reactors 22a and 23a are connected in series between output terminal T3 of UPS 12 and output terminal T3 of UPS 13 by turning on switch 43b. Since the series circuit of the reactors 22a and 23a functions as a reactor for suppressing the cross current, the UPSs 12 and 13 can be tested in parallel.
　なお、上述した実施の形態およびその変更例では、３台のＵＰＳを備える並列冗長方式の無停電電源システムについて説明したが、本開示に係る無停電電源システムにおいて、負荷に対して並列接続されるＵＰＳの台数は３台以上であればよい。 In the above-described embodiment and its modification example, a parallel redundant uninterruptible power supply system including three UPSs was described, but in the uninterruptible power supply system according to the present disclosure, the The number of UPSs may be three or more.
　今回開示された実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。本開示の技術的範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The technical scope of the present disclosure is indicated by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope of equivalence to the scope of claims.
　１　商用交流電源、２　コンバータ、３　インバータ、５　バイパス切換回路、６　保守バイパス回路、７，２４　制御回路、８　通信ケーブル、９　プロセッサ、１１～１３　ＵＰＳ、１５～１８，２１ｂ～２３ｂ，３１～３５，４２ａ，４２ｂ，４３ａ，４３ｂ　スイッチ、２０，２０Ａ，２０Ｂ　並列盤、２１ａ，２２ａ，２３ａ，４１，４１ａ，４１ｂ　リアクトル、３０　保守バイパス盤、４０　試験並列盤、５０ａ～５０ｃ　負荷、１００　無停電電源システム、Ｔ１，Ｔ１１～Ｔ１３，Ｔ２１，Ｔ２２　入力端子、Ｔ２　バッテリ端子、Ｔ３，Ｔ１４，Ｔ２３～Ｔ２５　出力端子、ＣＡＡ，ＣＡＢ，ＥＣＡＡ，ＥＣＡＢ　端子、Ｅ　終端抵抗。 1 Commercial AC power supply, 2 Converter, 3 Inverter, 5 Bypass switching circuit, 6 Maintenance bypass circuit, 7, 24 Control circuit, 8 Communication cable, 9 Processor, 11 to 13 UPS, 15 to 18, 21b to 23b, 31 to 35 , 42a, 42b, 43a, 43b switches, 20, 20A, 20B parallel board, 21a, 22a, 23a, 41, 41a, 41b reactor, 30 maintenance bypass board, 40 test parallel board, 50a to 50c load, 100 uninterruptible power supply System, T1, T11 to T13, T21, T22 Input terminals, T2 Battery terminals, T3, T14, T23 to T25 Output terminals, CAA, CAB, ECAA, ECAB terminals, E Termination resistor.

Claims (8)

  1. 　第１から第３の無停電電源装置を含む複数の無停電電源装置と、
    　前記複数の無停電電源装置を負荷に対して並列に接続するための複数のスイッチとを備え、
    　前記複数の無停電電源装置の各々は、
    　所定周波数の交流電圧を生成する電力変換器と、
    　前記電力変換器により生成された交流電圧を出力する出力端子とを含み、
    　前記複数のスイッチは、
    　前記第１の無停電電源装置の前記出力端子と前記負荷との間に接続される第１のスイッチと、
    　前記第２の無停電電源装置の前記出力端子と前記負荷との間に接続される第２のスイッチと、
    　前記第３の無停電電源装置の前記出力端子と前記負荷との間に接続される第３のスイッチとを含み、
    　前記第１および第２のスイッチがオフされ、かつ、前記第３のスイッチがオンされた状態において、前記第１の無停電電源装置の前記出力端子と前記第２の無停電電源装置の前記出力端子との間にリアクトルを接続するための接続回路をさらに備える、無停電電源システム。     a plurality of uninterruptible power supplies including first to third uninterruptible power supplies;
    A plurality of switches for connecting the plurality of uninterruptible power supply devices in parallel to a load,
    Each of the plurality of uninterruptible power supplies,
    a power converter that generates an alternating voltage of a predetermined frequency;
    an output terminal for outputting an alternating voltage generated by the power converter,
    The plurality of switches are
    a first switch connected between the output terminal of the first uninterruptible power supply and the load;
    a second switch connected between the output terminal of the second uninterruptible power supply and the load;
    a third switch connected between the output terminal of the third uninterruptible power supply and the load;
    The output terminal of the first uninterruptible power supply and the output of the second uninterruptible power supply in a state in which the first and second switches are turned off and the third switch is turned on An uninterruptible power supply system further comprising a connection circuit for connecting a reactor between terminals.
  2. 　前記複数のスイッチは、前記複数の無停電電源装置に接続される第１の並列盤に設けられ、
    　前記接続回路は、前記リアクトルを有する第２の並列盤である、請求項１に記載の無停電電源システム。     The plurality of switches are provided on a first parallel board connected to the plurality of uninterruptible power supply devices,
    2. The uninterruptible power supply system according to claim 1, wherein said connection circuit is a second parallel board having said reactor.
  3. 　前記複数のスイッチおよび前記接続回路は、前記複数の無停電電源装置に接続される並列盤に設けられ、
    　前記接続回路は、
    　前記第１の無停電電源装置の前記出力端子に接続される第１の端子と、
    　前記第２の無停電電源装置の前記出力端子に接続される第２の端子と、
    　前記第１の端子と前記第２の端子との間に直列に接続される前記リアクトルおよび第４のスイッチとを含み、
    　前記並列盤は、前記第１から第３のスイッチがオンされた状態において前記第４のスイッチをオフする一方で、前記第１および第２のスイッチがオフされ、かつ、前記第３のスイッチがオンされた状態において前記第４のスイッチをオンする、請求項１に記載の無停電電源システム。     The plurality of switches and the connection circuit are provided in a parallel board connected to the plurality of uninterruptible power supply devices,
    The connection circuit is
    a first terminal connected to the output terminal of the first uninterruptible power supply;
    a second terminal connected to the output terminal of the second uninterruptible power supply;
    including the reactor and a fourth switch connected in series between the first terminal and the second terminal;
    The parallel board turns off the fourth switch when the first to third switches are turned on, while the first and second switches are turned off and the third switch is turned off. 2. The uninterruptible power supply system according to claim 1, wherein the fourth switch is turned on in the turned-on state.
  4. 　前記複数のスイッチおよび前記接続回路は、前記複数の無停電電源装置に接続される並列盤に設けられ、
    　前記接続回路は、
    　前記第１の無停電電源装置の前記出力端子と前記第１のスイッチとの間に接続される第１のリアクトルと、
    　前記第２の無停電電源装置の前記出力端子と前記第２のスイッチとの間に接続される第２のリアクトルと、
    　前記第１のリアクトルおよび前記第１のスイッチの接続ノードと、前記第２のリアクトルおよび前記第２のスイッチの接続ノードとの間に接続される第４のスイッチとを含み、
    　前記並列盤は、前記第１から第３のスイッチがオンされた状態において前記第４のスイッチをオフする一方で、前記第１および第２のスイッチがオフされ、かつ、前記第３のスイッチがオンされた状態において前記第４のスイッチをオンする、請求項１に記載の無停電電源システム。     The plurality of switches and the connection circuit are provided in a parallel board connected to the plurality of uninterruptible power supply devices,
    The connection circuit is
    a first reactor connected between the output terminal of the first uninterruptible power supply and the first switch;
    a second reactor connected between the output terminal of the second uninterruptible power supply and the second switch;
    a fourth switch connected between a connection node of the first reactor and the first switch and a connection node of the second reactor and the second switch;
    The parallel board turns off the fourth switch when the first to third switches are turned on, while the first and second switches are turned off and the third switch is turned off. 2. The uninterruptible power supply system according to claim 1, wherein the fourth switch is turned on in the turned-on state.
  5. 　前記第１から第３の無停電電源装置は、対応する電力変換器を制御するための第１から第３の制御回路をそれぞれ含み、
    　前記第１および第２のスイッチがオフされ、前記第３のスイッチがオンされ、かつ、前記第１の無停電電源装置の前記出力端子と前記第２の無停電電源装置の前記出力端子との間に前記リアクトルが接続された状態において、
    　前記第３の制御回路は、前記負荷に供給する交流電圧を生成するように、対応する前記電力変換器を制御し、
    　前記第１および第２の制御回路の各々は、互いに等しい交流電圧を前記出力端子に出力するように、対応する前記電力変換器を制御する、請求項１から４のいずれか１項に記載の無停電電源システム。     The first to third uninterruptible power supplies each include first to third control circuits for controlling the corresponding power converters,
    The first and second switches are turned off, the third switch is turned on, and the output terminal of the first uninterruptible power supply and the output terminal of the second uninterruptible power supply In a state in which the reactor is connected between
    the third control circuit controls the corresponding power converter to generate an alternating voltage to be supplied to the load;
    5. The power converter according to any one of claims 1 to 4, wherein each of said first and second control circuits controls said corresponding power converter so as to output mutually equal AC voltages to said output terminals. Uninterruptible power system.
  6. 　無停電電源システムの更新方法であって、
    　前記無停電電源システムは、
    　各々が出力端子を有する第１から第３の無停電電源装置と、
    　前記第１から第３の無停電電源装置の出力端子を負荷にそれぞれ接続するための第１から第３のスイッチとを含み、
    　前記第１から第３の無停電電源装置の各々は、電力変換器を含み、前記電力変換器により生成された所定周波数の交流電圧を前記出力端子に出力するように構成され、
    　前記第１から第３のスイッチがオンした状態で前記第１から第３の無停電電源装置が並列運転している場合において、前記第１および第２の無停電電源装置の運転を停止し、かつ、前記第１および第２のスイッチをオフするステップと、
    　前記第１の無停電電源装置において、既設の無停電電源装置を新設の無停電電源装置に更新するステップと、
    　更新された前記第１の無停電電源装置の前記出力端子と、前記第２の無停電電源装置の前記出力端子との間にリアクトルを接続するステップと、
    　互いに等しい交流電圧を前記出力端子に出力するように前記第１および第２の無停電電源装置の各々の前記電力変換器を制御することにより、前記第１および第２の無停電電源装置の並列試験を実施するステップと、
    　前記並列試験の実施後に、前記第１および第２の無停電電源装置の運転を停止し、前記第１および第２の無停電電源装置から前記リアクトルを取り外すステップと、
    　前記第１および第２のスイッチをオンし、前記第１および第２の無停電電源装置を起動させることにより、前記第１から第３の無停電電源装置を並列運転させるステップとを備える、無停電電源システムの更新方法。     A method for updating an uninterruptible power supply system, comprising:
    The uninterruptible power supply system
    first to third uninterruptible power supplies each having an output terminal;
    and first to third switches for respectively connecting the output terminals of the first to third uninterruptible power supplies to loads,
    Each of the first to third uninterruptible power supplies includes a power converter and is configured to output to the output terminal an AC voltage of a predetermined frequency generated by the power converter,
    When the first to third uninterruptible power supply devices are operating in parallel with the first to third switches turned on, stopping the operation of the first and second uninterruptible power supply devices, and turning off the first and second switches;
    updating an existing uninterruptible power supply to a new uninterruptible power supply in the first uninterruptible power supply;
    connecting a reactor between the updated output terminal of the first uninterruptible power supply and the output terminal of the second uninterruptible power supply;
    Paralleling the first and second uninterruptible power supplies by controlling the power converters of each of the first and second uninterruptible power supplies to output alternating voltages equal to each other to the output terminals conducting a test;
    After performing the parallel test, stopping the operation of the first and second uninterruptible power supplies and removing the reactor from the first and second uninterruptible power supplies;
    and turning on the first and second switches to start the first and second uninterruptible power supplies to operate the first to third uninterruptible power supplies in parallel. How to update an outage power system.
  7. 　前記更新するステップは、前記第２のスイッチをオンし、前記第２の無停電電源装置を起動させることにより、前記第２および第３の無停電電源装置を並列運転させるステップを含み、
    　前記リアクトルを接続するステップは、前記第２の無停電電源装置の運転を停止し、前記第２のスイッチをオフした状態において、前記第１の無停電電源装置の前記出力端子と前記第２の無停電電源装置の前記出力端子との間に前記リアクトルを接続するステップを含む、請求項６に記載の無停電電源システムの更新方法。     The updating includes turning on the second switch and activating the second uninterruptible power supply to cause the second and third uninterruptible power supplies to operate in parallel;
    In the step of connecting the reactor, the operation of the second uninterruptible power supply is stopped and the output terminal of the first uninterruptible power supply and the second switch are connected in a state where the second switch is turned off. 7. The method for updating an uninterruptible power supply system according to claim 6, comprising the step of connecting said reactor between said output terminal of an uninterruptible power supply.
  8. 　前記第１から第３の無停電電源装置は、対応する前記電力変換器を制御するための第１から第３の制御回路をそれぞれ含み、
    　前記無停電電源システムは、
    　前記第１の制御回路と前記第２の制御回路とを通信接続するための第１の通信ケーブルと、
    　前記第２の制御回路と前記第３の制御回路とを通信接続するための第２の通信ケーブルとをさらに含み、
    　前記第１および第２のスイッチをオフするステップは、前記第１の通信ケーブルを前記第１および第２の制御回路から取り外すステップを含み、
    　前記更新するステップは、前記第１の通信ケーブルを、更新された前記第１の無停電電源装置の前記第１の制御回路および前記第２の制御回路に接続するとともに、前記第２の通信ケーブルを前記第２の制御回路から取り外すステップを含み、
    　前記リアクトルを取り外すステップは、前記第２の通信ケーブルを前記第２の制御回路に再接続するステップを含む、請求項６または７に記載の無停電電源システムの更新方法。     The first to third uninterruptible power supplies each include first to third control circuits for controlling the corresponding power converters,
    The uninterruptible power supply system
    a first communication cable for communication connection between the first control circuit and the second control circuit;
    further comprising a second communication cable for communication connection between the second control circuit and the third control circuit;
    turning off the first and second switches includes disconnecting the first communication cable from the first and second control circuits;
    The updating step connects the first communication cable to the first control circuit and the second control circuit of the updated first uninterruptible power supply, and connects the second communication cable from the second control circuit;
    8. The method for updating an uninterruptible power supply system according to claim 6, wherein removing said reactor includes reconnecting said second communication cable to said second control circuit.
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