JP7452741B1 - uninterruptible power system - Google Patents

Abstract

An object of the present invention is to provide an uninterruptible power supply system having a small size and simple configuration, which supplies power to loads of three or more systems by synchronously controlling three or more systems of uninterruptible power supplies. SOLUTION: Power converters 20a to 20c that convert the power of an AC power source S and output it to loads 50a to 50c, and first bypass circuits 30a to 30c that directly output the power of the AC power source S to the loads 50a to 50c. An uninterruptible power supply system 200 that supplies power to three or more loads 50a to 50c using three or more systems of uninterruptible power supplies 100a to 100c, each of which includes an information communication unit. 9a to 9c, the information communication units 9a to 9c are connected to other information communication units 9a to 9c to form a loop, and the information communication units 9a to 9c are connected to other information communication units 9a to 9c to form a loop. It is configured to communicate with sections 9a to 9c. [Selection diagram] Figure 1

Description

The present invention relates to an uninterruptible power supply system.

Conventionally, uninterruptible power supply systems have been known that supply power to three or more loads using one of two uninterruptible power supplies connected to an AC power supply (for example, patented (See Reference 1). The uninterruptible power supply system described in Patent Document 1 includes two systems of uninterruptible power supplies that supply power to three systems of loads. Each uninterruptible power supply has a bypass power supply circuit that directly supplies power from the AC power supply to the load, a power conversion unit that adjusts the power supplied to the load, and a power conversion unit that adjusts the power supplied to the load, and a power conversion unit that controls the output of the power conversion unit of its own system and the power of other systems. The uninterruptible power supply includes a voltage detector that detects the output of the converter and a synchronous selection circuit that acquires the voltage via the voltage detector.

Furthermore, in Patent Document 1, each of the uninterruptible power supplies further includes a signal relay circuit for mutually communicating the voltages acquired by the synchronous selection circuits. In the uninterruptible power supply system described in Patent Document 1, the synchronization selection circuit in the uninterruptible power supply mutually communicates information of the uninterruptible power supply via the signal relay circuit, and outputs the uninterruptible power supply. are synchronized.

Patent No. 5347415

In Patent Document 1, a plurality of voltage detectors are provided to detect each of the output of the power conversion section of the own system and the output of the power conversion section of the other system. Further, in Patent Document 1, of the two systems of uninterruptible power supplies, each of the output of the power converter of the own system and the output of the power converter of the other system is set to the output voltage of one of the uninterruptible power supplies. A configuration for synchronizing the two is disclosed. On the other hand, in an uninterruptible power supply system with three or more systems, if each uninterruptible power supply system is to be synchronized with the output voltage of the uninterruptible power supply system of any system, the output of the power conversion unit of the third system or later is detected. Since it is necessary to add a new voltage detector for this purpose, there is a problem that the configuration of the uninterruptible power supply becomes complicated and large. Therefore, there is a need for an uninterruptible power supply system with a small and simple configuration that synchronously controls three or more uninterruptible power supplies to supply power to loads of three or more systems.

This invention was made to solve the above-mentioned problems, and one purpose of the invention is to synchronously control three or more systems of uninterruptible power supplies to supply power to loads of three or more systems. To provide an uninterruptible power supply system with a small size and simple configuration.

In order to achieve the above object, an uninterruptible power supply system according to one aspect of the present invention includes a power conversion section that converts power of an AC power source and outputs the converted power to a load, and a power converter that converts power of an AC power source and outputs the power directly to the load. An uninterruptible power supply system that supplies power to three or more loads by using three or more uninterruptible power supplies including one bypass circuit, each uninterruptible power supply having a first bypass circuit of its own system in the uninterruptible power supply. A detection unit that detects the voltage of the circuit and the voltage of the bus from which power is output from the power conversion unit of the own system, and a synchronization unit that performs control to synchronize the voltage output by the power conversion unit of the own system to a predetermined voltage. The voltage of the first bypass circuit of the own system, and the value, frequency, and phase of the voltage of the bus from which power is output from the power converter of the own system, which are obtained based on the detection results of the control unit and the detection unit. an information communication unit that communicates detection information including at least one information communication unit, and the information communication unit is connected to other information communication units to form a loop shape, and the information communication unit is connected in a loop shape. The synchronization control unit is configured to communicate with other information communication units, and the synchronization control unit determines whether detection information obtained through communication between the information communication units connected in a loop is within a normal range. Based on the determination result , the system is configured to perform control to synchronize the voltage output by the power converter of its own system with a predetermined voltage.

In the uninterruptible power supply system according to one aspect of the present invention, as described above, the information communication unit is connected to other information communication units to form a loop, and the information communication unit is connected to the other information communication units to form a loop. The synchronization control unit is configured to communicate with other information communication units connected in a loop, and the synchronization control unit determines whether the detection information acquired by communication between the information communication units connected in a loop is within a normal range. Based on the determination result , the system is configured to perform control to synchronize the voltage output by the power conversion section of the own system with a predetermined voltage. As a result, the information communication section can communicate with the information communication section of the other system connected in a loop without the need to newly install a detection section (voltage detector) for detecting the voltage of the bus bar of the other system. This makes it possible to obtain detection information from all other systems of uninterruptible power supplies. Therefore, the synchronous control unit can synchronously control the power output from the power conversion unit of the own system to a predetermined voltage based on the detection information in the uninterruptible power supply of the other system. As a result, it is possible to provide a small and simple uninterruptible power supply system that synchronously controls three or more uninterruptible power supplies to supply power to three or more loads.

In the uninterruptible power supply system according to the first aspect, preferably, the predetermined voltage includes the voltage of the first bypass circuit of the own system or the voltage of the bus of the other system, and the synchronous control section is connected in a loop. Switches the voltage output by the power converter of the own system to the voltage of the first bypass circuit of the own system or the voltage of the bus of another system, based on the detection information acquired by the information communication unit communicating with the system. The system is configured to perform synchronization control. With this configuration, the output voltage of the power converter of the own system is changed to the voltage of the first bypass circuit of the own system based on the detection information acquired by communication between the information communication parts connected in a loop. Control can be performed in synchronization with a desired voltage among the voltages of bus lines of other systems. As a result, it is possible to synchronize the voltage output by the power converter of the own system to an appropriate value and supply power to the load.

In this case, preferably , the synchronization control unit included in each of the uninterruptible power supplies detects that the detection information of the uninterruptible power supply in its own system, which is obtained through communication between the information communication units connected in a loop, is within a normal range. Based on the determined result, the voltage output by the power converter of the own system is switched to the voltage of the first bypass circuit of the own system or the voltage of the bus of another system and synchronized. configured to perform control; With this configuration, it is determined whether the value is appropriate for synchronization based on the voltage of the first bypass circuit of the own system, the voltage of the bus bar from which power is output from the power converter of the own system, etc. be able to. Therefore, the voltage output by the power converter of the own system can be synchronized with the output voltage of the uninterruptible power supply that has been determined to be outputting an appropriate value. As a result, it is possible to synchronize the voltage output by the power converter of the own system to a more appropriate value and supply power to the load.

The synchronization control unit included in each of the above uninterruptible power supplies determines whether the detection information of the uninterruptible power supply in its own system, which is obtained through communication between the information and communication units connected in a loop, is within the normal range. In the uninterruptible power supply system to be determined, preferably, the synchronization control unit included in each uninterruptible power supply detects whether the uninterruptible power supply is within the normal range based on detection information acquired by communication between information communication units connected in a loop. The configuration is configured to perform control such that uninterruptible power supplies of other systems that have been determined to have detection information of a value that is not the same are excluded from synchronization targets. With this configuration, it is possible to prevent the voltage output by the power converter of the own system from being synchronized with an uninterruptible power supply that is operating abnormally. As a result, power can be supplied to the load by synchronizing the voltage output by the power converter of the own system with the normally operating uninterruptible power supply.

In the uninterruptible power supply system according to the first aspect, preferably, each of the uninterruptible power supplies is connected in parallel in a plurality of units in its own system, and communicates detection information with a synchronous control unit included in each of the uninterruptible power supplies in its own system. The parallel communication unit is configured to communicate detection information with parallel communication units of other uninterruptible power supplies in the own system. With this configuration, even when multiple uninterruptible power supplies are arranged in one system, the output voltages from the power converters included in the multiple uninterruptible power supplies in each system can be synchronized. , can be output to the load. As a result, even when there are multiple uninterruptible power supplies in one system, the voltage output from the power converter of the own system can be synchronized with one of the systems to supply power to the load.

In the uninterruptible power supply system according to the first aspect, preferably, the bus further includes a switch for disconnecting the uninterruptible power supply from the load, and the detection unit is configured to It is configured to detect the voltage of the bus on the side of the power outage. With this configuration, the detection unit is configured to detect the voltage of the bus on the uninterruptible power supply side of the bus in the own system, so the switch is in the open state (off state). By doing so, the uninterruptible power supply can be easily removed when performing maintenance or replacing the uninterruptible power supply. As a result, workability when maintaining or replacing the uninterruptible power supply can be improved.

In this case, preferably, a second bypass circuit is provided separately from the uninterruptible power supply, is connected to a bus bar on the load side of the switch, and outputs power of the AC power supply directly to the load; The bypass section further includes a bypass voltage detection section that detects the voltage of The information communication units are connected to each other to form a loop, and are configured to communicate with other information communication units connected in the loop. With this configuration, even in a system where the uninterruptible power supply is removed when the uninterruptible power supply is maintained or replaced, power can be supplied to the load via the second bypass circuit. Furthermore, based on the detection information obtained through the information communication section of the bypass section, the voltage output by the power conversion section of the system from which the uninterruptible power supply has not been removed can be synchronized with the voltage of the second bypass circuit. . As a result, even if the uninterruptible power supply is removed from one system, the voltage output by the power converter of the system from which the uninterruptible power supply has not been removed is synchronized with the voltage of either system, and power is supplied to the load. It can be performed.

According to the present invention, it is possible to provide a small and simple uninterruptible power supply system that synchronously controls three or more uninterruptible power supplies to supply power to three or more loads.

1 is a diagram showing the configuration of an uninterruptible power supply system according to a first embodiment of the present invention. FIG. 2 is a diagram showing a configuration related to connections of an information communication unit according to a first embodiment of the present invention. FIG. 4 is a diagram for explaining a case where four information communication units are connected in a loop. It is a diagram showing the configuration of an uninterruptible power supply system according to a comparative example. It is a diagram showing the configuration of an uninterruptible power supply system according to a second embodiment of the present invention. It is a diagram showing the configuration of an uninterruptible power supply system according to a third embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described based on the drawings.

[First embodiment]
With reference to FIG. 1, the configuration of an uninterruptible power supply system 200 according to the first embodiment will be described.

(Configuration of uninterruptible power supply system 200)
As shown in FIG. 1, the uninterruptible power supply system 200 uses power output from an AC power supply S to a bus 10a which is the output of the first system A, a bus 10b which is the output of the second system B, and a bus 10b which is the output of the second system B. This is a system in which three systems of loads 50a, 50b, and 50c are supplied from the bus 10c, which is the output of system C. The uninterruptible power supply system 200 includes transformers 1a, 1b, and 1c for converting power supplied from an AC power supply S, a switching machine 40a for switching the system that supplies power to loads 50a, 50b, and 50c, 40b and 40c. Moreover, in system A, the uninterruptible power supply system 200 includes a first bypass circuit 30a, a second bypass circuit 2a, and an uninterruptible power supply 100a. Moreover, in system B, the uninterruptible power supply system 200 includes a first bypass circuit 30b, a second bypass circuit 2b, and an uninterruptible power supply 100b. In addition, the uninterruptible power supply system 200 includes, in the system C, a first bypass circuit 30c, a second bypass circuit 2c, and an uninterruptible power supply 100c. In the following description, the configuration of the first system A will be described, but the same explanation can be applied to the second system B and the third system C.

The first bypass circuit 30a is configured to be partially included in the uninterruptible power supply 100a of the first system A, and transfers the power output from the transformer 1a to the connection point Aout on the bus 10a of the first system A. This is a circuit for transmitting information. The first bypass circuit 30a is configured to include a switch 31a, a power line 32a, a thyristor switch 33a, and a first bypass switch 34a. In the uninterruptible power supply 100a of the first system A, when the power converter 20a cannot operate normally due to an abnormality, the switch 31a is turned on, and the connection at the bus bar 10a of the first system A is made through the thyristor switch 33a. Power is supplied to point Aout. Then, when current flows through the thyristor switch 33a and the first bypass switch 34a is turned on, power is switched to be supplied via the first bypass switch 34a. As the power line 32a used in the first bypass circuit 30a, a cable wire covered with a single wire or a stranded wire, or a metal bus bar is used.

The second bypass circuit 2a supplies power supplied from the AC power supply S to the load through the second bypass circuit 2a when the uninterruptible power supply 100a of the first system A is removed for maintenance or replacement. This is a circuit for transmitting data to 50a to 50c. The second bypass circuit 2a is a power line that transmits the power output from the transformer 1a to the connection point Aout on the bus 10a of the first system A. Further, the second bypass circuit 2a includes a second bypass switch 3a that opens and closes as necessary. As the power line used in the second bypass circuit 2a, a cable wire covered with a single wire or a stranded wire, or a metal bus bar is used.

The uninterruptible power supply 100a is a power supply for supplying power to the loads 50a to 50c during a power outage or the like. The uninterruptible power supply 100a includes a first bypass circuit 30a, a power conversion section 20a including a converter section 21a and an inverter section 22a, and a detection section that detects the voltage of the first bypass circuit 30a and the voltage of a connection point Aout on the bus bar 10a. 7a, a synchronization control section 8a for controlling the operation of the power conversion section 20a, and an information communication section 9a for communicating information obtained based on the results detected by the detection section 7a.

The detection unit 7a is composed of a voltage dividing resistor and the like, and detects the voltage of the first bypass circuit 30a applied via the transformer 12a and the voltage of the connection point Aout on the bus bar 10a applied via the transformer 11a. To detect. Further, the detection section 7a is connected to the synchronization control section 8a, and detection information including information such as the voltage value, frequency, and phase of the detected voltage is transmitted to the synchronization control section 8a.

The synchronous control section 8a is connected to the detection section 7a, the information communication section 9a, and the power conversion section 20a, and receives detection information based on the voltage detected by the detection section 7a and information from other systems acquired from the information communication section 9a. Based on the detection information, the operation of the power converter 20a is controlled. More specifically, the voltage at the connection point Aout on the bus 10a output from the inverter section 22a of the power conversion section 20a is the voltage of the first bypass circuit 30a, the voltage at the connection point Bout on the bus 10b of the B system, Alternatively, the operation of the inverter unit 22a is controlled so as to be synchronized with the voltage at the connection point Cout on the C-system bus 10a. Further, the synchronization control unit 8a determines whether the detection information transmitted from the detection unit 7a is within a normal range, and switches the synchronization target of the voltage output from the inverter unit 22a based on the determined result. Perform such control. Note that the synchronization control section 8a uses a microcomputer or the like, and is mounted, for example, on a PCB board. The synchronization control unit 8a includes a CPU (Central Processing Unit) as a processor, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The information communication unit 9a is connected to the synchronization control unit 8a, the information communication unit 9b included in the B-system uninterruptible power supply 100b, and the information communication unit 9c included in the C-system uninterruptible power supply 100c, and the detection unit 7a communicates the information obtained based on the detected results. The information communication units 9a, 9b, and 9c are connected to each other in a loop shape. The information communication unit 9a communicates with the information communication units 9b and 9c connected in a loop, thereby acquiring detection information obtained based on the results detected by the detection unit 7b and the detection unit 7c, and performs synchronous control. The information is transmitted to section 8a. Note that the information communication units 9a to 9c are composed of electronic circuits including logic circuits.

Here, the configuration of the information communication sections 9a to 9c connected in a loop will be described using FIG. 2, which is a diagram schematically showing the uninterruptible power supplies 100a to 100c. As shown in FIG. 2, the information communication units 9a to 9c included in the uninterruptible power supplies 100a to 100c are configured in a loop shape (annular shape) when viewed as a whole, and each of the information communication units 9a to 9c By mutually communicating information with other connected information communication units 9a to 9c, it is possible to acquire information output by all information communication units 9a to 9c. Here, for example, as shown in FIG. 3, an explanation will be given assuming that an uninterruptible power supply 100d is added and the information communication units 9a to 9d included in each of the uninterruptible power supplies 100a to 100d are connected in a loop. . At this time, the information communication sections 9a and 9d are not directly connected, but communicate information with each other via the information communication sections 9b and 9c connected in a loop. Furthermore, although the information communication units 9b and 9c are not directly connected, they communicate information with each other via the information communication units 9a and 9d, which are connected in a loop. In this way, even when the number of uninterruptible power supplies increases to four or more, all the information and communication units included in each uninterruptible power supply can be interconnected by connecting them in a loop. Communicate information without any communication.

Also, a case will be described in which a problem occurs in communication due to a failure or the like in the communication line connecting the information communication section 9a of the uninterruptible power supply 100a and the information communication section 9d of the uninterruptible power supply 100d. In this case, the information communication unit 9a of the uninterruptible power supply 100a and the information communication unit 9d of the uninterruptible power supply 100d cannot communicate information using the communication line connected to each other, but A communication line connecting the information communication unit 9a and the information communication unit 9b of the uninterruptible power supply 100b, a communication line connecting the information communication unit 9b of the uninterruptible power supply 100b and the information communication unit 9c of the uninterruptible power supply 100c, and an uninterruptible power supply. A communication line connecting the information communication section 9c of the uninterruptible power supply 100c and the information communication section 9d of the uninterruptible power supply 100d is used to mutually communicate information. In this way, even if a communication problem occurs in one of the information communication units 9a to 9d connected in a loop, the information communication units 9a to 9d can communicate information with each other. It is.

The power converter 20a is for outputting power from the AC power supply S supplied via the transformer 1a as a voltage to the connection point Aout on the bus bar 10a. Furthermore, the power converter 20a is configured to be electrically disconnectable from the AC power source S and the load 50a by opening (turning off) the switches 4a, 5a, and 6a. When outputting power using the power conversion section 20a, power is supplied to the converter section 21a by closing (turning on) the switches 4a, 5a, and 6a. The converter section 21a is a so-called AC-DC converter that can convert supplied alternating current power into direct current power. The DC power output from the converter section 21a is stored in a power storage section (not shown) and is output to the inverter section 22a. Inverter unit 22a is controlled by synchronization control unit 8a to output desired AC power to connection point Aout on bus bar 10a when DC power is supplied from converter unit 21a or a power storage unit (not shown). Note that the converter section 21a and the inverter section 22a are configured with an electronic circuit that is a combination of a diode bridge, a switch, and the like.

The switching device 40a receives any two of the power at the connection point Aout on the bus 10a, the power at the connection point Bout on the bus 10b, and the power at the connection point Cout on the bus 10c; This is for switching the supply to the load 50a. In this first embodiment, the switching device 40a is connected to a connection point Aout on the bus bar 10a, a connection point Bout on the bus bar 10a, and a load 50a. The switching device 40a is a switch using a relay, for example, and switches the power supplied to the load 50a under desired conditions according to settings. The load 50a is an electrical device that operates using AC power, such as a motor or a pump.

(Operation of uninterruptible power supply system 200 in the first embodiment)
Here, an example of the operation of the uninterruptible power supply system 200 in the first embodiment will be described. In this description, each of the first system A, the second system B, and the third system C is connected to the uninterruptible power supply 100a without using the first bypass circuits 30a to 30c and the second bypass circuits 2a to 2c. A case where power is supplied to the load side using the power converters 20a, 20b, and 20c of 100c will be described. At this time, the synchronization control section 8b of the uninterruptible power supply 100b controls the operation of the inverter section 22b so as to synchronize with the voltage at the connection point Aout on the bus 10a of the first system A. Similarly, the synchronization control unit 8c of the uninterruptible power supply 100c controls the operation of the inverter unit 22c so as to synchronize with the voltage at the connection point Aout on the bus 10a of the first system A.

Here, in the first embodiment, if the power conversion unit 20a in the uninterruptible power supply 100a of the first system A is unable to output a normal voltage to the connection point Aout on the bus bar 10a due to some influence such as a failure, Explain. At this time, the synchronization control section 8a determines that the voltage of Aout detected by the detection section 7a is not normal. For example, the synchronization control unit 8a has a threshold value set in advance for the voltage value, and when the voltage value of Aout detected by the detection unit 7a is smaller than the threshold value, the synchronization control unit 8a detects the voltage of Aout. determines that it is not normal. Further, the synchronization control unit 8a may detect the frequency and phase of the voltage and determine that it is not normal. Then, the synchronization control unit 8a communicates detection information including the voltage of Aout detected by the detection unit 7a and a determination result that the voltage of Aout is not normal to the information communication unit 9b.

At this time, the information communication unit 9b of the uninterruptible power supply 100b of the second system B receives the voltage of Aout from the information communication unit 9a of the uninterruptible power supply 100a of the first system A, and the determination result that the voltage of Aout is not normal. Obtain detection information including. Thereby, the synchronization control section 8b performs control to switch the operation of the inverter section 22b so as not to synchronize with the voltage at the connection point Aout on the bus 10a of the first system A. Further, the information communication unit 9b of the uninterruptible power supply 100b of the second system B communicates with the information communication unit 9c of the uninterruptible power supply 100c of the third system C, and the voltage of Aout and the voltage of Aout are normal. Detection information including a determination result that the voltage of Bout is not normal, and detection information including a determination result that the voltage of Bout and the voltage of Bout are normal are transmitted. Then, the synchronization control unit 8c performs control to switch the operation of the inverter unit 22c to an operation that does not synchronize with the voltage at the connection point Aout on the bus 10a of the first system A. Note that the plurality of uninterruptible power supplies 100a to 100c are prioritized to be synchronized, and in the first embodiment, the synchronization control unit 8c transmits the output of the inverter unit 22c to the second system B. The operation of the inverter section 22c is controlled so as to be synchronized with the voltage at the connection point Bout on the bus bar 10b.

Thereafter, in the first system A, the switches 4a, 5a, and 6a are in the open state (off state) so that power is supplied via the first bypass circuit 30a, and the switch 31a and the first bypass switch The container 34a is in a closed state (on state). At this time, the detection unit 7a detects the voltage at the connection point Aout on the bus bar 10a via the transformer 11a. Then, the synchronization control unit 8a determines that the connection point Aout on the bus bar 10a is normal based on the detection result obtained from the detection unit 7a, and transmits the determination to the information communication unit 9a. Further, the detection unit 7a detects the voltage on the power line 32a of the first bypass circuit 30a via the transformer 12a. Here, since the first bypass circuit 30a does not include a device such as the power converter 20a that converts the output voltage, when supplying power using the first bypass circuit 30a, the connection point on the bus bar 10a The power supplied to Aout is the power output from the AC power supply S as is. In other words, when power is supplied using the first bypass circuit 30a, the voltage at the connection point Aout on the bus 10a is synchronized with the voltage at the connection point Bout on the bus 10b or Cout on the bus 10c of another system. I can't. At this time, the synchronous control unit 8a generates operating state information indicating that the voltage cannot be synchronously controlled in the first system A based on the voltage of the first bypass circuit 30a acquired from the detection unit 7a, The information is transmitted to the information communication section 9a.

The information communication unit 9b of the uninterruptible power supply 100b of the second system B receives the voltage of Aout detected by the detection unit 7a and the voltage of Aout from the information communication unit 9a of the uninterruptible power supply 100a of the first system A. Detection information indicating that the system is normal and operating state information indicating that the voltage cannot be synchronously controlled in the first system A are acquired. Then, the synchronization control section 8b performs control to synchronize the voltage output from the inverter section 22b with the voltage at the connection point Aout on the bus 10a of the first system A. Further, the information communication unit 9b of the uninterruptible power supply 100b of the second system B communicates with the information communication unit 9c of the uninterruptible power supply 100c of the third system C, and the voltage of Aout and the voltage of Aout are normal. Detection information including the information that synchronous control of the voltage is not possible in the first system A, and detection information including the information that the voltage of Bout and the voltage of Bout are normal are transmitted. do. Thereby, the synchronization control unit 8c performs control to switch the output of the inverter unit 22c to an operation that synchronizes with the voltage at the connection point Aout on the bus 10a of the first system A.

As described above, each of the systems B and C acquires detection information and operating state information of other systems via the information communication units 9a to 9c connected in a loop. Then, the synchronization control units 8a to 8c synchronize the voltage at the connection point Bout or Cout on the bus 10a outputted by the power conversion units 20b and 20c of the own system with the voltage at the connection point Aout on the bus 10a of the other system. control as follows.

(Comparative example)
Here, in FIG. 4, in each of the uninterruptible power supplies 100a to 100c, the voltages of connection points Aout, Bout, and Cout on the bus bar 10a of the uninterruptible power supplies 100a to 100c of other systems are synchronized, and the load 50a of the three systems is synchronized. A comparative example of an uninterruptible power supply system 201 that supplies power to ~50c will be described.

The uninterruptible power supply system 201 of the comparative example includes a central monitoring board 60. The central monitoring board 60 includes a synchronization selection circuit 61 that outputs information for controlling the operation of the power converters 20a to 20c included in each of the uninterruptible power supplies 100a to 100c, and a synchronization selection circuit 61 that is included in each of the uninterruptible power supplies 100a to 100c. The central information communication unit 62 is configured to communicate information with the information communication units 9a to 9c, and the central detection unit 63 is configured to detect voltages at connection points Aout, Bout, and Cout on the bus 10a. A synchronization selection circuit 61 included in the central monitoring board 60 acquires detection information based on the voltages of the connection points Aout, Bout, and Cout on the bus bar 10a detected by the central detection unit 63. Further, the synchronization selection circuit 61 acquires detection information obtained by communicating with the information communication units 9a to 9c of the uninterruptible power supplies 100a to 100c. Then, the synchronization selection circuit 61 outputs information for selecting one of the systems as a target to be synchronized, based on the acquired detection information and operating state information. Each of the synchronization control units 8a to 8c synchronizes the output of its own system with the voltages of the connection points Aout, Bout, and Cout on the bus 10a of the system to be synchronized obtained via the information communication units 9a to 9c. , controls the operation of the power converters 20a to 20c.

Here, in the case of the uninterruptible power supply system 200 of the first embodiment shown in FIG. If one of the equipment fails, synchronous control cannot be performed with the system including the failed equipment, but it is possible to perform synchronous control using the remaining system to supply power to the loads 50a to 50c. On the other hand, the uninterruptible power supply system 201 of the comparative example shown in FIG. 61. When either the central information communication unit 62 or the central detection unit 63 fails, all of the uninterruptible power supplies 100a to 100c cannot perform synchronous control.

(Effects of the first embodiment)
Next, the effects of the first embodiment will be explained.

The uninterruptible power supply system 200 of the first embodiment includes power converters 20a to 20c that convert the power of the AC power source S and output it to the loads 50a to 50c, and power converters 20a to 20c that convert the power of the AC power source S and directly output the power of the AC power source S to the loads 50a to 50c. This is an uninterruptible power supply system 200 that uses three systems of uninterruptible power supplies 100a to 100c including first bypass circuits 30a to 30c to supply power to three systems of loads 50a to 50c. Each of the uninterruptible power supplies 100a to 100c is connected to the voltage of the first bypass circuit 30a to 30c of its own system in the uninterruptible power supplies 100a to 100c, and the voltage on the bus 10a from which power is output from the power converters 20a to 20c of its own system. detection units 7a to 7c that detect the voltage at connection points Aout, Bout, or Cout, and synchronization control units 8a to 8c that perform control to synchronize the voltages output by the power conversion units 20a to 20c of the own system to a predetermined voltage. and information communication units 9a to 9c that communicate detection information acquired based on the detection results of the detection units 7a to 7c. The information communication units 9a to 9c are connected to other information communication units 9a to 9c to form a loop, and are connected to any of the other information communication units 9a to 9c connected in the loop. configured to communicate. The synchronization control units 8a to 8c adjust the voltages output by the power conversion units 20a to 20c of their own system to a predetermined level based on the detection information acquired through communication between the information communication units 9a to 9c connected in a loop. It is configured to perform control in synchronization with the voltage of As a result, the information communication units 9a to 9c can be connected to the other system connected in a loop without newly providing a detection unit for detecting the voltage at the connection point Aout, Bout, or Cout on the bus bar 10a of the other system. By communicating with the information communication units 9a to 9c, it is possible to acquire detection information from all other systems of uninterruptible power supplies 100a to 100c. Therefore, the synchronous control units 8a to 8c synchronously control the power output from the power conversion units 20a to 20c of the own system to a predetermined voltage based on the detection information in the uninterruptible power supplies 100a to 100c of other systems. becomes possible. As a result, it is possible to provide an uninterruptible power supply system 200 with a small and simple configuration that synchronously controls the three systems of uninterruptible power supplies 100a to 100c to supply power to the three systems of loads 50a to 50c. In addition, the information communication units 9a to 9c are connected in a loop without providing a mechanism such as the central monitoring board 60 that centrally detects the voltages at the connection points Aout, Bout, or Cout on the bus 10a of all systems. By communicating with the information communication units 9a to 9c of other systems, it is possible to obtain detection information in the uninterruptible power supplies 100a to 100c of other systems. Therefore, the synchronous control units 8a to 8c synchronously control the power output from the power conversion units 20a to 20c of the own system based on the detection information in each of the uninterruptible power supplies 100a to 100c of the other system, so that one Compared to the case where information is aggregated in a mechanism and synchronously controlled, there is less possibility that all the uninterruptible power supplies 100a to 100c cannot be synchronized due to a failure, and highly reliable synchronous control can be performed.

In the uninterruptible power supply system 200 of the first embodiment, the predetermined voltage includes the voltage of the first bypass circuit 30a of the own system, or the voltage of the connection point Aout, Bout, or Cout on the bus bar 10a of the other system. , the synchronous control units 8a to 8c adjust the voltages output by the power conversion units 20a to 20c of their own system, based on the detection information acquired by communication between the information communication units 9a to 9c connected in a loop, It is configured to perform synchronization control by switching to the voltage of the first bypass circuits 30a to 30c of the own system or the voltage of the connection point Aout, Bout, or Cout on the bus 10a of another system. With this configuration, the output voltages of the power converters 20a to 20c of the own system are changed to the output voltages of the power converters 20a to 20c of the own system based on the detection information acquired by communication between the information communication units 9a to 9c connected in a loop. Control can be performed in synchronization with a desired voltage among the voltages of the first bypass circuits 30a to 30c and the voltages of Aout, Bout, or Cout on the bus 10a of other systems. As a result, the voltages output by the power converters 20a to 20c of the own system can be synchronized to appropriate values, and power can be supplied to the loads 50a to 50c.

Further, in the first embodiment, the detection information includes the voltage of the first bypass circuits 30a to 30c of the own system, and Aout, Bout, or Cout at the bus bar 10a from which power is output from the power converters 20a to 20c of the own system. The synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c communicate with the information communication units 9a to 9c connected in a loop. It is determined whether or not the acquired detection information of the uninterruptible power supplies 100a to 100c of the own system is within the normal range, and the voltage output by the power converters 20a to 20c of the own system is determined based on the determined result. , the voltage of the first bypass circuits 30a to 30c of the own system, or the voltage of Aout, Bout, or Cout on the bus 10a of another system, and is configured to perform synchronization control. With this configuration, based on the voltage of the first bypass circuits 30a to 30c of the own system and the voltage of Aout, Bout, or Cout at the bus bar 10a from which power is output from the power converters 20a to 20c of the own system, You can determine whether the value is appropriate for synchronization. Therefore, the voltages output by the power converters 20a to 20c of the own system can be synchronized with the output voltages of the uninterruptible power supplies 100a to 100c that are determined to be outputting appropriate values. As a result, the voltages output by the power converters 20a to 20c of the own system can be synchronized to more appropriate values, and power can be supplied to the loads 50a to 50c.

In addition, in the first embodiment, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c control the own system information obtained through communication by the information communication units 9a to 9c connected in a loop. In the uninterruptible power supply system 200 that determines whether the detection information of the uninterruptible power supplies 100a to 100c is within a normal range, preferably, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c, Based on the detection information acquired by communication between the information communication units 9a to 9c connected in a loop, uninterruptible power supplies 100a to 100c of other systems are determined to have detection information of a value that is not within the normal range, It is configured to perform control such that it is excluded from synchronization targets. With this configuration, it is possible to prevent the voltages output by the power converters 20a to 20c of the own system from being synchronized to the uninterruptible power supplies 100a to 100c that are operating abnormally. As a result, the voltages output by the power converters 20a to 20c of the own system can be synchronized with the normally operating uninterruptible power supplies 100a to 100c, and power can be supplied to the loads 50a to 50c.

[Second embodiment]
Next, an uninterruptible power supply system 202 according to a second embodiment will be described using FIG. 5. The configuration of the uninterruptible power supply system 202 is such that each of the systems A to C of the uninterruptible power supply system 200 shown in FIG. 1 is provided with bypass sections 110a, 110b, and 110c. Note that in the second embodiment, descriptions of the points in common with the first embodiment will be omitted.

In the second embodiment, each of the systems A to C is provided with bypass sections 110a to 110c. Although the first system A will be explained here, the same explanation can be made for the second system B and the third system C. The bypass section 110a is a panel configured to include a part of the power line of the second bypass circuit 2a, the second bypass switch 3a, the bypass information communication section 15a, and the bypass voltage detection section 13a.

The bypass voltage detection unit 13a is, for example, a voltage dividing resistor, and is configured to detect the voltage of the second bypass circuit 2a via the transformer 14a. Further, the bypass voltage detection section 13a is connected to the bypass information communication section 15a, and detection information including information such as the voltage value, frequency, and phase of the detected voltage is transmitted to the bypass information communication section 15a.

The bypass information communication unit 15a is connected to the bypass voltage detection unit 13a, the information communication unit 9a in the uninterruptible power supply 100a of the first system A, and the information communication unit 9c in the uninterruptible power supply 100c of the third system C. ing. Here, the information communication units 9a to 9c and the bypass information communication units 15a to 15c are the bypass information communication unit 15a, the information communication unit 9a, the bypass information communication unit 15b, the information communication unit 9b, the bypass information communication unit 15c, and the information communication unit 9b. They are connected in a loop in the order of communication section 9c. Thereby, the bypass information communication unit 15a communicates with the information communication units 9a and 9c connected in a loop, thereby transmitting the detection information acquired by each of the information communication units 9a to 9c and the bypass information communication units 15a to 15c. It is configured to capture all.

(Operation of uninterruptible power supply system 202 in second embodiment)
Here, an example of the operation of the uninterruptible power supply system 202 in the second embodiment will be described. In this explanation, first, each of the first system A, the second system B, and the third system C is an uninterruptible power supply without using the first bypass circuits 30a to 30c and the second bypass circuits 2a to 2c. A case where power is supplied to the load side using the power converters 20a, 20b, and 20c of 100a to 100c will be described.

At this time, each of the information communication units 9a to 9c and the bypass information communication units 15a to 15c obtains detection information that the output voltages of Aout, Bout, and Cout are within a normal range through communication. Further, the information communication units 9a to 9c and the bypass information communication units 15a to 15c detect that the voltages of the first bypass circuits 30a to 30c and the second bypass circuits 2a to 2c are zero in each of the systems A to C. Acquire information through communication. In the second embodiment, the synchronization control section 8b of the uninterruptible power supply 100b controls the operation of the inverter section 22b so as to be synchronized with the voltage at the connection point Aout on the bus 10a of the first system A. Similarly, the synchronization control unit 8c of the uninterruptible power supply 100c controls the operation of the inverter unit 22c so as to synchronize with the voltage at the connection point Aout on the bus 10a of the first system A.

Here, in the second embodiment, due to some influence such as a failure of the thyristor switch 33a, the uninterruptible power supply 100a of the first system A is connected to the bus bar 10a using the first bypass circuit 30a and the power converter 20a. A case where a normal voltage cannot be output to the point Aout will be explained. At this time, the synchronization control section 8a determines that the voltage of Aout detected by the detection section 7a is not normal. Then, the synchronization control unit 8a transmits the voltage of Aout detected by the detection unit 7a and the detection information that the voltage of Aout is not normal to the bypass information communication unit 15b. Note that since the information communication units 9a to 9c and the bypass information communication units 15a to 15c are connected in a loop, each of the information communication units 9a to 9c and the bypass information communication units 15a to 15c is detected by the detection unit 7a. The voltage of Aout and the detection information that the voltage of Aout is not normal are acquired. After that, the operation of the power converters 20b and 20c of the second system B and the third system C is controlled in the same manner as in the first embodiment.

At this time, in the first system A, power cannot be supplied via the uninterruptible power supply 100a, so power is supplied using the second bypass circuit 2a. When the second bypass switch 3a closes and power supply using the second bypass circuit 2a starts, the bypass voltage detection unit 13a detects the voltage of the second bypass circuit 2a via the transformer 14a. The bypass information communication unit 15a communicates with the information communication unit 9a connected in a loop to transmit the detection information acquired from the bypass voltage detection unit 13a. The information communication unit 9a also detects that the voltage at the connection point Aout on the bus 10a detected by the detection unit 7a and the normal voltage being output from the connection point Aout on the bus 10a determined by the synchronization control unit 8a. The detection information is acquired and transmitted by communicating with the bypass information communication unit 15b connected in a loop. Note that since the information communication units 9a to 9c and the bypass information communication units 15a to 15c are connected in a loop, each of the information communication units 9a to 9c and the bypass information communication units 15a to 15c is detected by the detection unit 7a. The voltage of Aout and the detection information that the voltage of Aout is normal are acquired.

Due to the above operation, even if the uninterruptible power supply 100a of the first system A is unable to output a normal voltage to the connection point Aout on the bus bar 10a using the first bypass circuit 30a and the power conversion unit 20a, Synchronous control units 8b and 8c control the operation of inverter units 22b and 22c based on information acquired from information communication units 9b and 9c connected in a loop, and supply power to loads 50a to 50c.

(Effects of the second embodiment)
Next, the effects of the second embodiment will be explained.

In the second embodiment, the bus bar 10a further includes power output switches 16a, 16b, and 16c that disconnect the uninterruptible power supplies 100a to 100c and the loads 50a to 50c, and the detection units 7a to 7c Of the bus bars 10a, the voltage of the bus bar 10a closer to the uninterruptible power supplies 100a to 100c than the power output switches 16a to 16c is detected. As a result, the detection units 7a to 7c are configured to detect the voltage of the bus 10a of the own system, which is closer to the uninterruptible power supplies 100a to 100c than the power output switches 16a to 16c, so the power supply By opening the output switches 16a to 16c (off state), the uninterruptible power supplies 100a to 100c can be easily removed when performing maintenance or replacing the uninterruptible power supplies 100a to 100c. . As a result, it is possible to improve workability when maintaining or replacing the uninterruptible power supplies 100a to 100c.

Further, in the second embodiment, the uninterruptible power supplies 100a to 100c are provided separately, and connected to the bus bar 10a on the load 50a to 50c side than the power output switches 16a to 16c, and the power of the AC power supply S is The detection information obtained by the second bypass circuit 2a that outputs directly to the loads 50a to 50c, the bypass voltage detection units 13a to 13c that detect the voltages of the second bypass circuits 2a to 2c, and the bypass voltage detection units 13a to 13c. It further includes bypass sections 110a to 110c that include bypass information communication sections 15a to 15c that communicate with each other. The bypass information communication units 15a to 15c are connected to other information communication units 9a to 9c to form a loop, and communicate with the other information communication units 9a to 9c connected in the loop. is configured to do so. Thereby, even in a system from which the uninterruptible power supply 100a is removed when performing maintenance or replacement of the uninterruptible power supply 100a, power can be supplied to the loads 50a and 50c via the second bypass circuit 2a. Also, based on the detection information obtained via the information communication units 9a to 9c of the bypass units 110a to 110c, the voltage output by the power conversion unit 20b of the uninterruptible power supply 100b or the power conversion unit 20c of the uninterruptible power supply 100c is determined. , can be synchronized with the voltage of the second bypass circuit 2a. As a result, even when the uninterruptible power supply 100a is removed, the voltage output by the power converter 20b or 20c of the uninterruptible power supply 100b or 100c is synchronized with the voltage of one of the systems, and power is supplied to the loads 50a to 50c. supply can be made.

Note that other effects of the second embodiment are similar to those of the first embodiment.

[Third embodiment]
Next, an uninterruptible power supply system 203 according to a third embodiment will be described using FIG. 6. The first system A will be described below, but the same explanation can be applied to the second system B and the third system C. Note that, in the third embodiment, descriptions of common points with the first and second embodiments will be omitted.

The configuration of the uninterruptible power supply system 203 is such that uninterruptible power supplies are connected in parallel in each of systems A to C. Specifically, the configuration of the uninterruptible power supply system 203 includes uninterruptible power supplies 101a and 102a, second bypass circuits 2a corresponding to each of the uninterruptible power supplies 101a and 102a, and one of the two second bypass circuits 2a. The bypass portion 110a is provided on the side. Further, the power output from the two second bypass circuits 2a, the uninterruptible power supply 101a, and the uninterruptible power supply 102a is configured to supply power in common at the connection point Aout on the bus bar 10a. ing. The uninterruptible power supply system 203 also includes a power output switch 16a that disconnects the uninterruptible power supplies 101a and 102a, and the second bypass switch 3a and the power output switch 16a provide power to the connection point Aout on the bus 10a. It is configured to switch the target to which it is supplied.

The uninterruptible power supply 101a is different from the configuration of the uninterruptible power supply 100a shown in FIGS. 1, 4, and 5. In the uninterruptible power supply 101a shown in FIG. Instead, it is configured to detect the voltage at the contacts of the power converter 20a and the first bypass circuit 30a, which are closer to the uninterruptible power supply 101a than the power output switch 16a. Further, the uninterruptible power supply 101a includes a parallel communication unit 17a, and acquires detection information based on the voltage detection result and operating state information regarding the operating state of the uninterruptible power supply 101a from the synchronous control unit 8a.

The uninterruptible power supply 102a is different from the configuration of the uninterruptible power supply 100a shown in FIGS. 1, 4, and 5 in that the detection unit 7a is configured to detect only the input side voltage of the first bypass circuit 30a. . Further, the uninterruptible power supply 102a includes a parallel communication section 17a similarly to the uninterruptible power supply 101a. The parallel communication unit 17a of the uninterruptible power supply 101a and the parallel communication unit 17a of the uninterruptible power supply 102a are connected to each other and mutually communicate operating state information. Thereby, the uninterruptible power supply 101a and the uninterruptible power supply 102a control the operation of each power conversion unit 20a so that the output power is synchronized based on the information acquired from the parallel communication unit 17a.

In FIG. 6, the detailed configurations of the second system B and the third system C are omitted, but they include the same configuration as the first system A. At this time, the information communication unit 9a included in the uninterruptible power supply 102a in the first system A is connected to the bypass information communication unit 15b of the bypass unit 110b in the second system B. In this way, the information communication units 9a to 9c and the bypass information communication units 15a to 15c are connected to form a loop when viewed as a whole.

(Effects of the third embodiment)
Next, the effects of the third embodiment will be explained.

In the third embodiment, a plurality of uninterruptible power supplies 101a and 102a, 101b and 102b, or 101c and 102c are connected in parallel in their own system. Each of the uninterruptible power supplies 101a and 102a includes a parallel communication unit 17a that communicates detection information with the synchronization control unit 8a. Further, each of the uninterruptible power supplies 101b and 102b includes a parallel communication unit 17b that communicates detection information with the synchronization control unit 8a. Further, each of the uninterruptible power supplies 101c and 102c includes a parallel communication unit 17c that communicates detection information with the synchronization control unit 8c. The parallel communication unit 17a communicates detection information between the other uninterruptible power supplies 101a and 102a of the own system. Further, the parallel communication unit 17b communicates detection information between 101b and 102b. Further, the parallel communication unit 17b communicates detection information between 101c and 102c. As a result, even when a plurality of uninterruptible power supplies 101a and 102a, 101b and 102b, or 101c and 102c are arranged in one system, a plurality of uninterruptible power supplies 101a and 102a, 101b in each system and 102b, or 101c and 102c, the output voltages from the power converters 20a to 20c can be synchronized and output to the loads 50a to 50c. As a result, even when there are multiple uninterruptible power supplies 100a to 100c in one system, the voltages output by the power converters 20a to 20c of the own system can be synchronized to one of the systems, and the loads 50a to 50c It is possible to supply power to

Note that other effects of the third embodiment are similar to those of the first embodiment or the second embodiment.

[Modified example]
Note that the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and further includes all changes (modifications) within the meaning and range equivalent to the claims.

For example, in the first to third embodiments described above, an example of the uninterruptible power supply system 200 that uses three systems of uninterruptible power supplies 100a to 100c to supply power to three systems of loads 50a to 50c was shown, but in this case, The invention is not limited to this. The present invention may be configured to supply power to four or more loads using four or more uninterruptible power supplies, depending on the number of loads and the target operating rate (load factor). , it is recommended to increase the number of grids in the uninterruptible power supply system. Note that as the number of systems increases, more systems can be switched, and the load factor of the uninterruptible power supply system can be improved. However, if the number of systems is increased, the uninterruptible power supply system becomes larger, so the number of systems is preferably 3 to 5.

Further, in the first to third embodiments described above, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c are acquired by communication between the information communication units 9a to 9c connected in a loop. Although an example has been shown in which it is determined whether the detection information of the uninterruptible power supplies 100a to 100c of the own system is within the normal range, the present invention is not limited to this. In the present invention, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c are configured to control the synchronization control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c. It may be configured to determine whether the detection information of the power outage power supplies 100a to 100c is within a normal range.

Further, in the first to third embodiments described above, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c are acquired by communication between the information communication units 9a to 9c connected in a loop. An example was shown in which control is performed to exclude uninterruptible power supplies 100a to 100c of other systems that have been determined to have detection information with a value that is not within the normal range from the targets of synchronization based on the detected information. The invention is not limited to this. In the present invention, the synchronization control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c perform predetermined control based on detection information acquired through communication between the information communication units 9a to 9c connected in a loop. Control may be performed to exclude uninterruptible power supplies 100a to 100c of other systems that are determined to have detection information of a value that is not within the normal range from being synchronized during the period of time.

Further, in the first to third embodiments described above, an example was shown in which the second bypass circuit 2a is provided separately from the uninterruptible power supplies 100a to 100c in each of the systems A to C, but the present invention is not limited to this. do not have. In the present invention, each of the systems A to C may be configured to include only the uninterruptible power supplies 100a to 100c.

Further, in the third embodiment, two uninterruptible power supplies 101a and 102a are connected in parallel in the first system A, two uninterruptible power supplies 101b and 102b are connected in parallel in the second system B, and Although an example is shown in which two uninterruptible power supplies 101c and 102c are connected in parallel in system C of No. 3, the present invention is not limited to this. In the present invention, each of the systems A to C may be configured to connect three or more uninterruptible power supplies in parallel.

2a, 2b, 2c Second bypass circuit 3a, 3b, 3c Second bypass switch 7a, 7b, 7c Detection section 8a, 8b, 8c Synchronization control section 9a, 9b, 9c Information communication section 10a, 10b, 10c Bus bar 13a, 13b, 13c Bypass voltage detection section 15a, 15b, 15c Bypass information communication section 16a, 16b, 16c Power output switch 17a, 17b, 17c Parallel communication circuit 20a, 20b, 20c Power conversion section 21a, 21b, 21c Converter section 22a, 22b, 22c Inverter section 30a, 30b, 30c First bypass circuit 40a, 40b, 40c Switching machine 50a, 50b, 50c Load 100a-102a, 100b-102b, 100c-102c Uninterruptible power supply 110a, 110b, 110c Bypass section 200a- 203a, 200b to 203b, 200c to 203c Uninterruptible power supply system A First system B Second system C Third system S AC power supply

Claims (8)

A power converter that converts the power of the AC power source and outputs it to the load, and a first bypass circuit that directly outputs the power of the AC power source to the load. An uninterruptible power supply system that supplies power to the load,
Each of the uninterruptible power supplies includes:
a detection unit that detects a voltage of the first bypass circuit of the own system in the uninterruptible power supply and a voltage of a bus line from which power is output from the power converter of the own system;
a synchronization control unit that performs control to synchronize the voltage output by the power conversion unit of its own system to a predetermined voltage;
The voltage of the first bypass circuit of the own system, and the value, frequency, and phase of the voltage of the bus from which power is output from the power converter of the own system, which are obtained based on the detection result of the detection unit. an information communication unit that communicates detection information including at least one ;
The information communication unit is configured to be connected to other information communication units to form a loop, and to communicate with the other information communication units connected in a loop. Ori,
The synchronization control unit is configured to control the power conversion unit of the own system based on a determination result of whether the detection information acquired by communication between the information communication units connected in a loop is within a normal range. An uninterruptible power supply system configured to perform control to synchronize a voltage output by the predetermined voltage with the predetermined voltage. The predetermined voltage includes the voltage of the first bypass circuit of the own system or the voltage of the bus of another system,
The synchronization control unit is configured to adjust the voltage output by the power conversion unit of the own system to the first one of the own system, based on the detection information acquired by the communication between the information communication units connected in a loop. The uninterruptible power supply system according to claim 1, wherein the uninterruptible power supply system is configured to perform control to switch and synchronize the voltage of the bypass circuit or the voltage of the bus of another system. The synchronization control unit included in each of the uninterruptible power supplies determines that the detection information of the uninterruptible power supply in its own system, which is acquired through communication by the information communication unit connected in a loop, is within a normal range. determining whether or not there is one, and switching the voltage output by the power converter of the own system to the voltage of the first bypass circuit of the own system or the voltage of the bus of another system based on the determined result; The uninterruptible power supply system according to claim 2, wherein the uninterruptible power supply system is configured to perform synchronization control. The synchronization control unit included in each of the uninterruptible power supplies detects the detection information having a value that is not within a normal range, based on the detection information acquired through communication by the information communication unit connected in a loop. The uninterruptible power supply system according to claim 3, wherein the uninterruptible power supply system according to claim 3 is configured to perform control to exclude the uninterruptible power supply of another system determined to have the uninterruptible power supply from the synchronization target. The information communication unit is configured to further communicate operating state information indicating the operating state of each of the uninterruptible power supplies,
The synchronous control unit is configured to respond to the operating state information, which is obtained through communication by the information communication unit connected in a loop, indicating that there is an uninterruptible power supply in which the voltage of the bus bar cannot be synchronously controlled. Based on this, the voltage output by the power converter of the own system is controlled to be synchronized with the voltage of the bus of the uninterruptible power supply in which the voltage of the bus cannot be synchronously controlled. , The uninterruptible power supply system according to claim 1. Each of the uninterruptible power supplies includes a parallel communication unit that is connected in parallel in a plurality of units in its own system and communicates the detection information with the synchronization control unit included in each of the uninterruptible power supplies in its own system,
The uninterruptible power supply system according to claim 1, wherein the parallel communication unit is configured to communicate the detection information with the parallel communication unit of another uninterruptible power supply in its own system. The bus bar further includes a switch that disconnects the uninterruptible power supply and the load,
The uninterruptible power supply system according to claim 1 or 6, wherein the detection unit is configured to detect the voltage of the bus bar of the own system that is closer to the uninterruptible power supply than the switch. . a second bypass circuit that is provided separately from the uninterruptible power supply, is connected to the bus bar on the load side of the switch, and outputs power of the AC power supply directly to the load;
a bypass voltage detection section that detects the voltage of the second bypass circuit;
further comprising a bypass section including a bypass information communication section that communicates the detection information obtained by the bypass voltage detection section,
The bypass information communication unit is configured to be connected to the other information communication units to form a loop, and to communicate with the other information communication units connected in the loop. The uninterruptible power supply system according to claim 7.

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