Uninterruptible power supply (UPS) system and test method for UPS system

Abstract

This invention provides an uninterruptible power supply (UPS) system and a test method for the UPS system that can minimize the impact on power supply to the load during combination testing of a newly updated battery and UPS. [Solution] The DC distribution panel 50 is equipped with multiple switches for connecting the replaced battery to a test connection uninterruptible power supply (UPS) among the multiple active UPS units 20A, 20B and the standby UPS unit 20P when one of the multiple batteries 61, 62 is replaced.

Description

Technical Field

[0001] The present disclosure relates to an uninterruptible power supply system and a method for testing an uninterruptible power supply system.

Background Art

[0002] In an uninterruptible power supply system that requires high reliability, even if a failure or the like occurs in the uninterruptible power supply device, it is necessary to continue supplying power to the load with the uninterruptible power supply device. For this reason, conventionally, a redundant uninterruptible power supply system has been configured by combining a plurality of uninterruptible power supply devices.

[0003] As such a redundant uninterruptible power supply system, for example, Japanese Patent Application Laid-Open No. 2005-218200 (Patent Document 1) discloses an uninterruptible power supply system including a plurality of normal operation uninterruptible power supply devices configured to always supply power to a load, and a standby uninterruptible power supply device provided as a common backup for these plurality of normal operation uninterruptible power supply devices.

[0004] In a redundant uninterruptible power supply system, generally, the standby uninterruptible power supply device is configured by one unit for a plurality of normal operation uninterruptible power supply devices. The output of the standby uninterruptible power supply device is input to each of the plurality of normal operation uninterruptible power supply devices as a bypass input power source. When maintenance inspection or a failure occurs in one normal operation uninterruptible power supply device, the output of the standby uninterruptible power supply device becomes the bypass input power source of the normal operation uninterruptible power supply device, and power is supplied to the load via the bypass circuit of the normal operation uninterruptible power supply device.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In conventional redundant uninterruptible power supply (UPS) systems, when replacing existing batteries with new ones, it is necessary to perform a compatibility test between the new batteries and the UPS. During this compatibility test, batteries that are not being replaced are also connected to the UPS. There is a concern that if a malfunction occurs during this compatibility test between the new batteries and the UPS, it could negatively impact the power supply to the load.

[0007] Therefore, the purpose of this disclosure is to provide an uninterruptible power supply system and a test method for an uninterruptible power supply system that can minimize the impact on power supply to the load during combination testing of the updated battery and the uninterruptible power supply. [Means for solving the problem]

[0008] The uninterruptible power supply system of this disclosure comprises a plurality of active uninterruptible power supplies, a standby uninterruptible power supply, a plurality of batteries, and a DC distribution board connected to the plurality of batteries, the plurality of active uninterruptible power supplies, and the standby uninterruptible power supply. The DC distribution board includes a plurality of switches for connecting a battery that has been replaced to the plurality of active uninterruptible power supplies and a test connection uninterruptible power supply among the standby uninterruptible power supplies when one of the plurality of batteries is replaced. [Effects of the Invention]

[0009] According to this disclosure, the impact on power supply to the load can be reduced during combination testing of the updated battery and uninterruptible power supply. [Brief explanation of the drawing]

[0010] [Figure 1] This diagram shows the configuration of an uninterruptible power supply system using a standby redundancy method and a common battery, as an example. [Figure 2] This diagram shows the switch state and current flow of an uninterruptible power supply (UPS) system during normal operation in a reference example. [Figure 3]This diagram shows the switch state and current flow during the first combination test in the example uninterruptible power supply system. [Figure 4] This diagram shows the configuration of an uninterruptible power supply system with standby redundancy and a common battery according to the embodiment. [Figure 5] This diagram shows the switch state and current flow of the uninterruptible power supply system during normal operation in the embodiment of the uninterruptible power supply system. [Figure 6] This is a flowchart illustrating the procedure for the first combination test in the uninterruptible power supply system of the embodiment. [Figure 7] This diagram shows the switch state and current flow during the first combination test in the uninterruptible power supply system of the embodiment. [Figure 8] This is a flowchart illustrating the procedure for the second combination test in the uninterruptible power supply system of the embodiment. [Figure 9] This diagram shows the switch state and current flow during the second combination test in the uninterruptible power supply system of the embodiment. [Figure 10] This is a flowchart illustrating the procedure for the third combination test in the uninterruptible power supply system of the embodiment. [Modes for carrying out the invention]

[0011] The embodiments will be described below with reference to the drawings. (Reference example) Figure 1 shows the configuration of a reference example of an uninterruptible power supply system with standby redundancy and a common battery. Figure 1 shows the case with one standby unit, two active units, and two batteries.

[0012] The uninterruptible power supply system of the reference example includes a first normal-use uninterruptible power supply device 20A, a second normal-use uninterruptible power supply device 20B, a standby uninterruptible power supply device 20P, a first normal-use output distribution board 40A, a switch SA1, a second normal-use output distribution board 40B, a switch SB1, a switch SP1, a DC distribution board 50, a first storage battery 61, and a second storage battery 62. For example, the standby uninterruptible power supply device 20P is used when at least one of the first normal-use uninterruptible power supply device 20A and the second normal-use uninterruptible power supply device 20B fails.

[0013] The first normal-use uninterruptible power supply device 20A includes a first normal-use UPS 11A and a first normal-use input / output board 21A. The second normal-use uninterruptible power supply device 20B includes a second normal-use UPS 11B and a second normal-use input / output board 21B. The standby uninterruptible power supply device 20P includes a standby UPS 11P and a standby input / output board 21P.

[0014] In the following description, the first normal-use UPS 11A, the first normal-use input / output board 21A, the first normal-use output distribution board 40A, and the switch SA1 may be described as the first normal-use system, the second normal-use UPS 11B, the second normal-use input / output board 21B, the second normal-use output distribution board 40B, and the switch SB1 may be described as the second normal-use system, and the standby UPS 11P, the standby input / output board 21P, and the switch SP1 may be described as the standby system.

[0015] The first normal-use system will be described. The second normal-use system is the same as the first normal-use system, so the description will not be repeated.

[0016] The first normal-use UPS 11A includes a battery terminal TA0, an input terminal TA1, an input terminal TA2, an output terminal TA3, a converter 3A, an inverter 4A, a bypass circuit 6A, and a bypass switching circuit 5A. The first normal-use input / output board 21A includes switches SA2 to SA8, an AC input terminal TA5, an AC output terminal TA9, a bypass input terminal TA4, output terminals TA6 and TA7, and an input terminal TA8.

[0017] The input terminal TA2 is connected to the output terminal TA7. The input terminal TA1 is connected to the output terminal TA6. The output terminal TA3 is connected to the input terminal TA8.

[0018] The AC input terminal TA5 can be connected to the commercial AC power supply 1 via the switch SA1. The switch SA2 is arranged between the bypass input terminal TA4 and the node NA1. The switch SA3 is arranged between the AC input terminal TA5 and the node NA1. The switch SA4 is arranged between the node NA1 and the output terminal TA6. The switch SA5 is arranged between the AC input terminal TA5 and the output terminal TA7. The switch SA6 is arranged between the node NA1 and the node NA2. The switch SA7 is arranged between the input terminal TA8 and the node NA2. The switch SA8 is arranged between the node NA3 and the AC output terminal TA9.

[0019] The converter 3A and the inverter 4A are connected in series between the input terminal TA2 and the output terminal TA3. The input node of the converter 3A is connected to the input terminal TA2. The output node of the converter 3A is connected to the input node of the inverter 4A. The output node of the inverter 4A is connected to the output terminal TA3. The bypass circuit 6A is arranged between the input terminal TA1 and the output terminal TA3.

[0020] The bypass switching circuit 5A switches between the output of the inverter 4A and the output of the bypass circuit 6A. The bypass switching circuit 5A switches the electrical connection and disconnection between the bypass circuit 6A and the output terminal TA3. Specifically, the bypass switching circuit 5A includes a switch connected between the bypass circuit 6A and the output terminal TA3. The switch is in a non-conductive (off) state during power supply from the inverter 4A and in a conductive (on) state during power supply from the bypass circuit 6A.

[0021] A control unit (not shown) controls converter 3A and inverter 4A to generate AC power. In the event of a power outage, the control unit stops converter 3A and controls inverter 4A to generate AC power. The control unit determines whether AC power is being supplied normally from commercial AC power 1 based on the voltage at input terminal TA2 (i.e., the AC voltage supplied from commercial AC power 1). The control unit controls converter 3A and inverter 4A based on the determination result. If the control unit detects a fault in inverter 4A, it controls the bypass switching circuit 5A to electrically connect the bypass circuit 6A and output terminal TA3.

[0022] The battery terminal TA0 is connected to a DC circuit (DC link) between the output node of converter 3A and the input node of inverter 4A, and is configured to be connectable to at least one of the first storage battery 61 and the second storage battery 62 via the DC distribution board 50.

[0023] Converter 3A receives AC power at commercial frequency from commercial AC power source 1. Under normal circumstances, when AC power is supplied from commercial AC power source 1, converter 3A converts the AC power to DC power. Converter 3A is controlled so that the DC voltage supplied to the DC circuit is a constant voltage.

[0024] At least one of the first battery 61 and the second battery 62 is capable of storing DC power generated by the converter 3A under normal conditions. At least one of the first battery 61 and the second battery 62 is capable of supplying DC power to the inverter 4A in the event of a power outage when the supply of AC power from the commercial AC power source 1 is interrupted.

[0025] Inverter 4A is connected to the DC circuit. Under normal circumstances, inverter 4A converts the DC power generated by converter 3A into AC power at commercial frequency, and in the event of a power outage, it converts the DC power supplied from at least one of the first battery 61 and the second battery 62 into AC power at commercial frequency.

[0026] The first regular output distribution panel 40A includes switches SA9 and SA10, AC input terminals TA10 and TA11, and AC output terminals TA12 and TA13.

[0027] AC input terminal TA10 can be connected to AC output terminal TP9 of the standby uninterruptible power supply 20P. AC input terminal TA11 can be connected to AC output terminal TA9 of the first active uninterruptible power supply 20A.

[0028] The first terminal of switch SA9 is connected to the AC input terminal TA10. The second terminal of switch SA9 is connected to node NA3. The first terminal of switch SA10 is connected to the AC input terminal TA11. The second terminal of switch SA10 is connected to node NA3.

[0029] AC output terminal TA12 is connected to the second terminal of switch SA9 and the second terminal of switch SA10 via node NA3, and load LA1 can be connected to it. AC output terminal TA13 is connected to the second terminal of switch SA9 and the second terminal of switch SA10 via node NA3, and load LA2 can be connected to it.

[0030] Switches SA1, SA2, SA3, SA4, SA5, SA6, SA8, SA9, and SA10 may also be trip switches that automatically turn off when excessive current flows through them.

[0031] The standby UPS 11P includes battery terminal TP0, input terminals TP1 and TP2, output terminal TP3, converter 3P, inverter 4P, bypass circuit 6P, and bypass switching circuit 5P. The standby output distribution panel 40P includes switches SP4, SP7, and SP8, switches 33 and 34, switch 31 and switch 32, AC input terminal TP5, output terminals TP6 and TP7, input terminal TP8, AC output terminals TP9 and TP10, and bypass output terminals TP11 and TP12. Input terminal TP2 is connected to output terminal TP7. Input terminal TP1 is connected to output terminal TP6. Output terminal TP3 is connected to input terminal TP8.

[0032] The AC input terminal TP5 can be connected to the commercial AC power supply 1 via switch SP1. Switch SP4 is located between the AC input terminal TP5 and the output terminal TA6. Switch SP5 is located between the AC input terminal TP5 and the output terminal TP7. Switch SP6 is located between the AC input terminal TP5 and node NP1. Switch SP7 is located between the input terminal TP8 and node NP1. The bypass output terminal TP11 is connected to the bypass input terminal TA4 of the first normal system. The bypass output terminal TP12 is connected to the bypass input terminal TB4 of the second normal system. The AC output terminal TP9 is connected to the AC input terminal TA10 of the first normal system. The AC output terminal TP10 is connected to the AC input terminal TB10 of the second normal system.

[0033] Switch 33 is located between node NP1 and AC output terminal TP9. Switch 34 is located between node NP1 and AC output terminal TP10.

[0034] Switch 31 is located between node NP1 and bypass output terminal TP12. Switch 32 is located between node NP1 and bypass output terminal TP11.

[0035] Converter 3P and inverter 4P are connected in series between input terminal TP2 and output terminal TP3. The input node of converter 3P is connected to input terminal TP2. The output node of converter 3P is connected to the input node of inverter 4P. The output node of inverter 4P is connected to output terminal TP3. Bypass circuit 6P is located between input terminal TP1 and output terminal TP3.

[0036] The bypass switching circuit 5P switches between the output of inverter 4P and the output of bypass circuit 6P. The bypass switching circuit 5P switches the electrical connection and disconnection between bypass circuit 6P and output terminal TP3. Specifically, the bypass switching circuit 5P includes a switch connected between bypass circuit 6P and output terminal TP3. The switch is in a non-conductive (off) state when power is supplied from inverter 4P and in a conductive (on) state when power is supplied from bypass circuit 6P.

[0037] A control unit (not shown) controls converter 3P and inverter 4P to generate AC power. In the event of a power outage, the control unit stops converter 3P and controls inverter 4P to generate AC power. The control unit determines whether AC power is being supplied normally from commercial AC power 1 based on the voltage at input terminal TP2 (i.e., the AC voltage supplied from commercial AC power 1). The control unit controls converter 3P and inverter 4P based on the determination result. If the control unit detects a fault in inverter 4P, it controls the bypass switching circuit 5P to electrically connect the bypass circuit 6P and output terminal TP3.

[0038] The battery terminal TP0 is connected to a DC circuit (DC link) between the output node of converter 3P and the input node of inverter 4P, and is configured to be connectable to at least one of the first storage battery 61 and the second storage battery 62 via the DC distribution board 50.

[0039] Converter 3P receives AC power at commercial frequency from commercial AC power source 1. Under normal circumstances, when AC power is supplied from commercial AC power source 1, converter 3P converts the AC power to DC power. Converter 3P is controlled so that the DC voltage supplied to the DC circuit remains constant.

[0040] At least one of the first battery 61 and the second battery 62 is capable of storing DC power generated by the converter 3P under normal conditions. At least one of the first battery 61 and the second battery 62 is capable of supplying DC power to the inverter 4P in the event of a power outage when the supply of AC power from the commercial AC power source 1 is interrupted.

[0041] Inverter 4P is connected to the DC circuit. Under normal circumstances, inverter 4P converts the DC power generated by converter 3P into AC power at commercial frequency, and in the event of a power outage, it converts the DC power supplied from at least one of the first battery 61 and the second battery 62 into AC power at commercial frequency.

[0042] Switches SP1, SP4, SP5, SP6, 31, 32, 33, and 34 may also be trip switches that automatically turn off when excessive current flows through them.

[0043] The DC distribution panel 50 is connected to the first battery 61 and the second battery 62, as well as to the battery terminal TA0 of the first active UPS 11A, the battery terminal TB0 of the second active UPS 11B, and the battery terminal TP0 of the standby UPS 11P.

[0044] The DC distribution panel 50 is equipped with switches (circuit breakers) 51, 52, 53, 54, and 55, and terminals Tx1, Tx2, Tx3, Tx4, and Tx5.

[0045] Terminal Tx1 is connected to battery terminal TP0, which is connected to the DC circuit between the standby system converter 3P and inverter 4P. Terminal Tx2 is connected to battery terminal TA0, which is connected to the DC circuit between the first active system converter 3A and inverter 4A. Terminal Tx3 is connected to battery terminal TB0, which is connected to the DC circuit between the second active system converter 3B and inverter 4B. Terminal Tx4 is connected to terminal Tx6 of the first storage battery 61. Terminal Tx5 is connected to terminal Tx7 of the second storage battery 62.

[0046] Switch 51 has a first end connected to terminal Tx1 and a second end connected to common node ND1. Switch 52 has a first end connected to terminal Tx2 and a second end connected to common node ND1. Switch 53 has a first end connected to terminal Tx3 and a second end connected to common node ND1.

[0047] Switch 54 has a first end connected to the common node ND1 and a second end connected to terminal Tx4. Switch 55 has a first end connected to the common node ND1 and a second end connected to terminal Tx5.

[0048] (Normal operation) Figure 2 shows the switch state and current flow of the uninterruptible power supply (UPS) system during normal operation in the example UPS system.

[0049] In the first normal operation system, switches SA1, SA2, SA4, SA5, SA7, SA8, and SA10 are set to ON, and switches SA3, SA6, and SA9 are set to OFF.

[0050] In the second normal operation system, switches SB1, SB2, SB4, SB5, SB7, SB8, and SB10 are set to ON, and switches SB3, SB6, and SB9 are set to OFF.

[0051] In the standby system, switches SP1, SP4, SP5, SP7, 31, 32, 33, and 34 are set to ON, and SP6 is set to OFF.

[0052] In the DC distribution panel 50, switches 51, 52, 53, 54, and 55 are set to ON.

[0053] (First combination test) This section describes how to replace the second battery 62 and perform a combination test (first combination test) between the new second battery 62 and the standby UPS 11P. Figure 3 shows the switch state and current flow during the first combination test in the uninterruptible power supply system of the reference example.

[0054] In the first normal operation system, switches SA1, SA3, SA4, SA5, SA7, SA8, and SA10 are set to ON, and switches SA2, SA6, and SA9 are set to OFF.

[0055] In the second normal operation system, switches SB1, SB3, SB4, SB5, SB7, SB8, and SB10 are set to ON, and switches SB2, SB6, and SB9 are set to OFF.

[0056] In the standby system, switches SP1, SP4, SP5, and SP7 are set to ON, and SP6, 31, 32, 33, and 34 are set to OFF. As a result, power supply from the standby UPS11P to the load, the first active UPS11A, and the second active UPS11B is stopped.

[0057] In the DC distribution panel 50, switches 51, 52, 53, 54, and 55 are set to ON. This connects the second battery 62 to be replaced to the standby UPS 11P, allowing verification that the power supply (charging) from the standby UPS 11P to the second battery 62 is functioning correctly. Verification of whether the power supply (discharging) from the standby UPS 11P to the second battery 62 is functioning correctly can be done by controlling the standby switches (for example, by turning off switch SP5).

[0058] However, in the example shown, the second battery 62 to be replaced is connected not only to the standby UPS 11P, but also to the first active UPS 11A supplying power to load LA2, and to the second active UPS 11B supplying power to load LB2. As a result, the second battery 62 to be replaced may affect the power supply to the first active UPS 11A and the second active UPS 11B.

[0059] (Embodiment) Figure 4 shows the configuration of an uninterruptible power supply (UPS) system with standby redundancy and a common battery according to an embodiment. Figure 4 shows a case with one standby system, two active systems, and three batteries. The difference between the UPS system in Figure 4 and the UPS system in Figure 1 is the DC distribution panel 50.

[0060] The DC distribution panel 50 is connected to the first battery 61 and the second battery 62, as well as to the battery terminal TA0 of the first active UPS 11A, the battery terminal TB0 of the second active UPS 11B, and the battery terminal TP0 of the standby UPS 11P.

[0061] The DC distribution panel 50 is equipped with switches (circuit breakers) 51, 52, 53, 54, 55, 71, 72, 81, 82, 91, and 92, and terminals Tx1, Tx2, Tx3, Tx4, and Tx5.

[0062] Terminal Tx1 is connected to battery terminal TP0, which is connected to the DC circuit between the standby system converter 3P and inverter 4P. Terminal Tx2 is connected to battery terminal TA0, which is connected to the DC circuit between the first active system converter 3A and inverter 4A. Terminal Tx3 is connected to battery terminal TB0, which is connected to the DC circuit between the second active system converter 3B and inverter 4B. Terminal Tx4 is connected to terminal Tx6 of the first storage battery 61. Terminal Tx5 is connected to terminal Tx7 of the second storage battery 62.

[0063] Switch 51 has a first end connected to terminal Tx1 and a second end connected to common node ND1. Switch 52 has a first end connected to terminal Tx2 and a second end connected to common node ND1. Switch 53 has a first end connected to terminal Tx3 and a second end connected to common node ND1.

[0064] Switch 54 has a first end connected to the common node ND1 and a second end connected to terminal Tx4. Switch 55 has a first end connected to the common node ND1 and a second end connected to terminal Tx5.

[0065] Switch 71 has a first end connected to terminal Tx1 and a second end connected to terminal Tx4. Switch 72 has a first end connected to terminal Tx1 and a second end connected to terminal Tx5. Switch 81 has a first end connected to terminal Tx2 and a second end connected to terminal Tx4. Switch 82 has a first end connected to terminal Tx2 and a second end connected to terminal Tx5. Switch 91 has a first end connected to terminal Tx3 and a second end connected to terminal Tx4. Switch 92 has a first end connected to terminal Tx3 and a second end connected to terminal Tx5.

[0066] (Normal operation) Figure 5 is a diagram showing the switch state and current flow of the uninterruptible power supply system during normal operation in the embodiment of the uninterruptible power supply system.

[0067] In the first normal operation system, switches SA1, SA2, SA4, SA5, SA7, SA8, and SA10 are set to ON, and switches SA3, SA6, and SA9 are set to OFF.

[0068] In the second normal operation system, switches SB1, SB2, SB4, SB5, SB7, SB8, and SB10 are set to ON, and switches SB3, SB6, and SB9 are set to OFF.

[0069] In the standby system, switches SP1, SP4, SP5, SP7, 31, 32, 33, and 34 are set to ON, and SP6 is set to OFF.

[0070] In the DC distribution panel 50, switches 51, 52, 53, 54, and 55 are set to ON, and switches 71, 72, 81, 82, 91, and 92 are set to OFF.

[0071] (First combination test) This section describes how to replace the second battery 62 and perform a combination test (first combination test) between the new second battery 62 and the standby UPS 11P. Figure 6 is a flowchart showing the procedure for the first combination test in the uninterruptible power supply system of the embodiment. Figure 7 is a diagram showing the switch state and current flow during the first combination test in the uninterruptible power supply system of the embodiment. During the first combination test and while operating the equipment, power supply to loads LA1, LA2, LB1, and LB2 is kept continuous.

[0072] In step S101, switch 55 is set to OFF in the DC distribution panel 50.

[0073] In step S102, the battery 62 is replaced from the existing one to a new one. In step S103, in the first normal operating system, switch SA2 is set to OFF and switch SA3 is set to ON. In the second normal operating system, switch SB2 is set to OFF and switch SB3 is set to ON.

[0074] In step S104, in the standby system, switches 31, 32, 33, and 34 are set to OFF, UPS 11P is stopped, converter 3P and inverter 4P are stopped, and switches SP4 and SP5 are set to OFF. In the DC distribution panel 50, switch 51 is set to OFF, and switch 72 is set to ON.

[0075] In step S105, in the standby system, UPS11P is started, switches SP4 and SP5 are set to ON, and converter 3P and inverter 4P are started.

[0076] In step S106, a combination test is performed between the battery 62 and the uninterruptible power supply 20P.

[0077] In step S107, in the standby system, UPS11P is stopped, converter3P and inverter4P are stopped, and switches SP4 and SP5 are set to OFF. In the DC distribution panel 50, switch 72 is set to OFF, and switches 51 and 55 are set to ON.

[0078] In step S108, in the standby system, UPS11P is started, switches SP4 and SP5 are set to ON, converter 3P and inverter 4P are started, and switches 31, 32, 33, and 34 are set to ON.

[0079] In step S109, in the first normal operating system, switch SA3 is set to OFF and switch SA2 is set to ON. In the second normal operating system, switch SB3 is set to OFF and switch SB2 is set to ON.

[0080] In the first combination test, the first and second regular UPS systems 11A and 11B, which are supplying power to loads LA1, LA2, LB1, and LB2, are disconnected from the second battery 62 that is to be replaced. This reduces the impact of the second battery 62 on the power supply to loads LA1, LA2, LB1, and LB2.

[0081] The state of each switch during the first combination test is as follows, as shown in Figure 7.

[0082] In the first normal operation system, switches SA1, SA3, SA4, SA5, SA7, SA8, and SA10 are turned on, and switches SA2, SA6, and SA9 are turned off.

[0083] In the second normal operation system, switches SB1, SB3, SB4, SB5, SB7, SB8, and SB10 are turned on, and switches SB2, SB6, and SB9 are turned off.

[0084] In standby mode, switches SP1, SP4, SP5, and SP7 are turned on, while switches SP6 and 31-34 are turned off.

[0085] In the DC distribution panel 50, switches 52, 53, 54, and 72 are turned on, and switches 51, 55, 71, 81, 82, 91, and 92 are turned off.

[0086] (Second combination test) This section describes how to replace the second battery 62 and perform a combination test (second combination test) between the new second battery 62 and the first regular UPS 11A. Figure 8 is a flowchart showing the procedure for the second combination test in the uninterruptible power supply system of the embodiment. Figure 9 is a diagram showing the switch state and current flow during the second combination test in the uninterruptible power supply system of the embodiment. During the second combination test and while operating the equipment, power supply to loads LA1, LA2, LB1, and LB2 is kept continuous.

[0087] In step S201, switch 55 is set to OFF in the DC distribution panel 50.

[0088] In step S202, the battery 62 is replaced from the existing one to a new one. In step S203, in the second normal operating system, switch SB2 is set to OFF and switch SB3 is set to ON.

[0089] In step S204, in the first normal operation system, UPS11A is switched to bypass power supply, switch SA9 is set to ON, and switch SA10 is set to OFF.

[0090] In step S205, the UPS11A is switched to inverter power supply in the first normal operating system.

[0091] In step S206, in the first normal operating system, switch SA2 is set to OFF and switch SA3 is set to ON.

[0092] In step S207, switches 31, 32, and 34 are set to OFF in the standby system.

[0093] In step S208, in the first normal operating system, switch SA8 is set to OFF, UPS 11A is stopped, converter 3A and inverter 4A are stopped, and switches SA4 and SA5 are set to OFF. In the DC distribution panel 50, switch 52 is set to OFF and switch 82 is set to ON.

[0094] In step S209, in the first normal operation system, UPS11A is started, switches SA4 and SA5 are set to ON, and converter 3A and inverter 4A are started.

[0095] In step S210, a combination test is performed between the battery 62 and the uninterruptible power supply 20A.

[0096] In step S211, in the first normal operation system, UPS11A is stopped, converter3A and inverter4A are stopped, and switches SA4 and SA5 are set to OFF. In the DC distribution panel 50, switch 82 is set to OFF, and switches 55 and 52 are set to ON.

[0097] In step S212, in the first normal operation system, UPS11A is started, switches SA4 and SA5 are set to ON, converter 3A and inverter 4A are started, and switch SA8 is set to ON.

[0098] In step S213, switch 31 is set to ON in the standby system. In step S214, in the first normal operating system, switch SA3 is set to OFF, switch SA2 is set to ON, UPS11A is switched to bypass power supply, switch SA10 is set to ON, and switch SA9 is set to OFF.

[0099] In step S215, the UPS11A is switched to inverter power supply in the first normal operating system.

[0100] In step S216, switches 32 and 34 are set to ON in the standby system. In step S217, in the second normal operating system, switch SB3 is set to OFF and switch SB2 is set to ON.

[0101] In the second combination test, the standby uninterruptible power supply 20P and the second active uninterruptible power supply 20B, which are supplying power to loads LA1, LA2, LB1, and LB2, are disconnected from the second battery 62 that is to be replaced. This reduces the impact of the second battery 62 on the power supply to loads LA1, LA2, LB1, and LB2.

[0102] The state of each switch during the second combination test is as follows, as shown in Figure 9.

[0103] In the first normal operation system, switches SA1, SA3, SA4, SA5, SA7, and SA9 are turned on, and switches SA2, SA6, SA8, and SA10 are turned off.

[0104] In the second normal operation system, switches SB1, SB3, SB4, SB5, SB7, SB8, and SB10 are turned on, and switches SB2, SB6, and SB9 are turned off.

[0105] In standby mode, switches SP1, SP4, SP5, SP7, and 33 are turned on, and switches SP6, 31, 32, and 34 are turned off.

[0106] In the DC distribution panel 50, switches 51, 53, 54, and 82 are turned on, and switches 52, 55, 71, 72, 81, 91, and 92 are turned off.

[0107] (Third combination test) This section describes how to replace the second battery 62 and perform a combination test (third combination test) between the new second battery 62 and the second regular UPS 11B. Figure 10 is a flowchart showing the procedure for the third combination test in the uninterruptible power supply system of this embodiment. During the third combination test and while the equipment is being operated, power is continuously supplied to loads LB1, LB2, LA1, and LA2.

[0108] In step S301, switch 55 is set to OFF in the DC distribution panel 50.

[0109] In step S302, the battery 62 is replaced from the existing one to a new one. In step S303, in the first normal operating system, switch SA2 is set to OFF and switch SA3 is set to ON.

[0110] In step S304, in the second normal operation system, UPS11B is switched to bypass power supply, switch SB9 is set to ON, and switch SB10 is set to OFF.

[0111] In step S305, the UPS11B is switched to inverter power supply in the second normal operation system.

[0112] In step S306, in the second normal operating system, switch SB2 is set to OFF and switch SB3 is set to ON.

[0113] In step S307, switches 31, 32, and 33 are set to OFF in the standby system.

[0114] In step S308, in the second normal operation system, switch SB8 is set to OFF, UPS 11B is stopped, converter 3B and inverter 4B are stopped, and switches SB4 and SB5 are set to OFF. In the DC distribution panel 50, switch 53 is set to OFF and switch 92 is set to ON.

[0115] In step S309, in the second normal operation system, UPS11B is started, switches SB4 and SB5 are set to ON, and converter 3B and inverter 4B are started.

[0116] In step S310, a combination test of the battery 62 and the uninterruptible power supply 20B is performed.

[0117] In step S311, in the second normal operation system, UPS11B is stopped, converter 3B and inverter 4B are stopped, and switches SB4 and SB5 are set to OFF. In the DC distribution panel 50, switch 92 is set to OFF, and switches 55 and 53 are set to ON.

[0118] In step S312, in the second normal operation system, UPS11B is started, switches SB4 and SB5 are set to ON, converter 3B and inverter 4B are started, and switch SB8 is set to ON.

[0119] In step S313, switch 32 is set to ON in the standby system. In step S314, in the second normal operation system, switch SB3 is set to OFF, switch SB2 is set to ON, UPS11B is switched to bypass power supply, switch SB10 is set to ON, and switch SB9 is set to OFF.

[0120] In step S315, the UPS11B is switched to inverter power supply in the second normal operation system.

[0121] In step S316, switches 31 and 33 are set to ON in the standby system. In step S317, in the first normal operating system, switch SA3 is set to OFF and switch SA2 is set to ON.

[0122] In the third combination test, the standby uninterruptible power supply 20P and the first active uninterruptible power supply 20A, which are supplying power to loads LA1, LA2, LB1, and LB2, are disconnected from the second battery 62 that is to be replaced. This reduces the impact of the second battery 62 on the power supply to loads LA1, LA2, LB1, and LB2.

[0123] The state of each switch during the third combination test is as follows: In the first normal operation system, switches SA1, SA3, SA4, SA5, SA7, SA8, and SA10 are turned on, and switches SA2, SA6, and SA9 are turned off.

[0124] In the second normal operation system, switches SB1, SB3, SB4, SB5, SB7, and SB9 are turned on, and switches SB2, SB6, SB8, and SB10 are turned off.

[0125] In standby mode, switches SP1, SP4, SP5, SP7, and 34 are turned on, and switches SP6, 31, 32, and 33 are turned off.

[0126] In the DC distribution panel 50, switches 51, 52, 54, and 92 are turned on, and switches 53, 55, 71, 72, 81, 82, and 91 are turned off.

[0127] As described above, according to this embodiment, during combination testing of the updated battery and the uninterruptible power supply, the updated battery is not connected to the UPS in operation, thus preventing the updated battery from having any adverse effect on the power supply to the load by the UPS in operation. In the above embodiment, the case of two active UPSs, one standby UPS, and two batteries was shown, but it is not limited to these cases, and the same method can be applied and the same effect obtained even if there are three or more active UPSs, two or more standby UPSs, and three or more batteries.

[0128] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The present invention is indicated by the claims rather than by the foregoing description, and all modifications are intended to be in the sense and scope equivalent to the claims. [Explanation of Symbols]

[0129] 1 Commercial AC power supply, 3A, 3B, 3P converter, 4A, 4B, 4P inverter, 5A, 5B, 5P bypass switching circuit, 6A, 6B, 6P bypass circuit, 11A, 11B, 11P UPS, 20A, 20B, 20P uninterruptible power supply, 21A, 21B, 21P input / output panel, 40A, 40B, 40P output distribution panel, 50 DC distribution panel, 61, 62 storage battery, LA1, LA2, LB1, LB2 load, NA1, NA2, NA3, NP1, ND1 node, SA1~SA10, SB1~SB10, SP1, SP4~SP7, 31~34, 51~55, 71, 72, 81, 82, 91, 92 Switch, terminals TA0~TA13, TB0~TB13, TP0~TP12, Tx1~Tx7.

Claims

1. Multiple uninterruptible power supplies for regular use, A standby uninterruptible power supply, Multiple storage batteries, The system comprises the aforementioned plurality of storage batteries, the aforementioned plurality of normal-use uninterruptible power supplies, and a DC distribution board connected to the aforementioned standby uninterruptible power supply, The DC distribution panel is an uninterruptible power supply system that includes multiple switches for connecting one of the multiple batteries to a test connection uninterruptible power supply among the multiple active uninterruptible power supplies and the standby uninterruptible power supplies when the replaced battery is replaced.

2. The uninterruptible power supply system according to claim 1, wherein the plurality of switches connect the replaced battery to the standby uninterruptible power supply unit, and connect the batteries other than the replaced battery among the plurality of batteries to the plurality of active uninterruptible power supply units.

3. The aforementioned plurality of regular uninterruptible power supply units include a first regular uninterruptible power supply unit and a second regular uninterruptible power supply unit. The plurality of storage batteries include a first storage battery and a second storage battery, The aforementioned multiple switches are A first switch is positioned between the first battery and the common node, A second switch is positioned between the second battery and the common node, A third switch is positioned between the common node and the standby uninterruptible power supply, A fourth switch is positioned between the common node and the first uninterruptible power supply unit for the normal operation system, A fifth switch is positioned between the common node and the second uninterruptible power supply unit for the normal operation system, A sixth switch is positioned between the first storage battery and the standby uninterruptible power supply, The uninterruptible power supply system according to claim 2, further comprising a seventh switch disposed between the second battery and the standby uninterruptible power supply unit.

4. The aforementioned plurality of regular uninterruptible power supply units include the first regular uninterruptible power supply unit. The uninterruptible power supply system according to claim 1, wherein the plurality of switches connect the replaced battery to the first active uninterruptible power supply, and connect the batteries other than the replaced battery among the plurality of active uninterruptible power supplies to the uninterruptible power supplies other than the first active uninterruptible power supply, and the standby uninterruptible power supply.

5. The aforementioned plurality of regular uninterruptible power supply units further include a second regular uninterruptible power supply unit. The plurality of storage batteries include a first storage battery and a second storage battery, The aforementioned multiple switches are A first switch is positioned between the first battery and the common node, A second switch is positioned between the second battery and the common node, A third switch is positioned between the common node and the standby uninterruptible power supply, A fourth switch is positioned between the common node and the first uninterruptible power supply unit for the normal operation system, A fifth switch is positioned between the common node and the second uninterruptible power supply unit for the normal operation system, A sixth switch is positioned between the first storage battery and the first uninterruptible power supply unit for normal use, The uninterruptible power supply system according to claim 4, further comprising a seventh switch disposed between the second storage battery and the first regular uninterruptible power supply unit.

6. The aforementioned plurality of regular uninterruptible power supply units include a first regular uninterruptible power supply unit and a second regular uninterruptible power supply unit. The plurality of storage batteries include a first storage battery and a second storage battery, The aforementioned multiple switches are A first switch is positioned between the first battery and the common node, A second switch is positioned between the second battery and the common node, A third switch is positioned between the common node and the standby uninterruptible power supply, A fourth switch is positioned between the common node and the first uninterruptible power supply unit for the normal operation system, A fifth switch is positioned between the common node and the second uninterruptible power supply unit for the normal operation system, A sixth switch is positioned between the first storage battery and the standby uninterruptible power supply, A seventh switch is positioned between the second battery and the standby uninterruptible power supply, An eighth switch is positioned between the first storage battery and the first uninterruptible power supply unit for normal use, A ninth switch is positioned between the second battery and the first uninterruptible power supply unit for normal use, A tenth switch is positioned between the first storage battery and the second normal-use uninterruptible power supply, The uninterruptible power supply system according to claim 1, further comprising an eleventh switch disposed between the second storage battery and the second normal-use uninterruptible power supply unit.

7. A test method for a continuous power supply to a load of an uninterruptible power supply system as described in claim 1, The step of replacing one of the multiple storage batteries, A method for testing an uninterruptible power supply system, comprising the steps of: connecting the replaced storage battery to the test connection uninterruptible power supply unit.

8. A test method for a continuous power supply to a load of an uninterruptible power supply system as described in claim 3, The step of replacing the second storage battery, A test method for an uninterruptible power supply system, comprising the steps of setting the second switch to off, the third switch to off, and the seventh switch to on.

9. A test method for a continuous power supply to a load of an uninterruptible power supply system as described in claim 5, The step of replacing the second storage battery, A test method for an uninterruptible power supply system, comprising the steps of setting the second switch to off, the fourth switch to off, and the seventh switch to on.

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