JP7439979B1 - Uninterruptible power supply system and power supply method using the uninterruptible power supply system - Google Patents

Abstract

[Problem] When three systems of uninterruptible power supplies are synchronously controlled to supply power to a load, even if the output of any of the uninterruptible power supplies cannot be synchronously controlled, the uninterruptible power supplies of three or more systems To provide an uninterruptible power supply system capable of appropriately synchronizing the outputs of each of the following. [Solution] Using three or more systems of uninterruptible power supplies 100a to 100c including power conversion units 20a to 20c that convert and output AC power and first bypass circuits 30a to 30c that directly output power from an AC power supply S, An uninterruptible power supply system 200 that supplies power, each of the uninterruptible power supplies 100a to 100c includes synchronous control units 8a to 8c, and the synchronous control units 8a to 8c are configured to output power from power conversion units 20a to 20c of their own system. It is configured to perform control to synchronize the voltages of the bus lines 10a to 10c with the voltages of the bus lines 10a to 10c of the uninterruptible power supplies 100a to 100c of other systems in which the voltages of the bus lines 10a to 10c cannot be synchronously controlled. [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, when an abnormality occurs in the voltage of the bypass power supply circuit included in one of the two uninterruptible power supplies due to a power outage, etc. Disclosed is a configuration for controlling a power conversion unit so as to synchronize the voltage of a bus output from its own system with the voltage of a normal voltage bypass power supply circuit included in the other uninterruptible power supply of two systems of uninterruptible power supplies. has been done.

Patent No. 5347415

On the other hand, Patent Document 1 does not specify a method for controlling synchronization targets in three or more systems of uninterruptible power supplies, and a control method when an abnormality occurs in any system of uninterruptible power supplies. Therefore, in the configuration of Patent Document 1, when one of the three or more systems of uninterruptible power supplies becomes abnormal, how can they be synchronized in an appropriate manner for the load? There is a problem in that it is unclear whether the uninterruptible power supplies can supply appropriate power, and each uninterruptible power supply may supply power in synchronization with an inappropriate voltage.

This invention was made in order 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 a load. To provide an uninterruptible power supply system capable of appropriately synchronizing the outputs of three or more systems of uninterruptible power supplies even when the output of any of the uninterruptible power supplies cannot be synchronously controlled.

In order to achieve the above object, an uninterruptible power supply system according to a first aspect of the present invention includes a power conversion unit that converts power of an AC power source and outputs it to a load, and a power converter that converts power of an AC power source and outputs the power to the load directly. An uninterruptible power supply system that uses three or more uninterruptible power supplies including bypass circuits to supply power to three or more loads, in which each uninterruptible power supply has the voltage of its own bypass circuit in the uninterruptible power supply. , and a detection unit that detects the voltage of the bus output from the power conversion unit of the own system, detection information obtained based on the detection result of the detection unit, and operating status information regarding the operating status of the uninterruptible power supply. an information communication unit that communicates, and a synchronization control unit that performs control to switch and synchronize the voltage output from the power conversion unit of the own system to the voltage of the bus of another system based on the detection information and the operation status information. The synchronous control unit controls the voltage output by the power conversion unit of the own system when it obtains operation status information indicating that there is an uninterruptible power supply of another system in which the voltage of the bus cannot be synchronously controlled. It is configured to perform control to synchronize the voltage of the bus bar with the voltage of the bus bar of an uninterruptible power supply of another system in which the voltage of the bus bar cannot be synchronously controlled.

As described above, in the uninterruptible power supply system according to the first aspect of the present invention, the synchronization control unit included in each of the three or more uninterruptible power supplies is configured to control voltages of the busbars of other systems in a state where the voltage of the bus cannot be synchronously controlled. When the operating state information that there is an uninterruptible power supply is obtained, the voltage output by the power converter of the own system is changed to the bus voltage of the uninterruptible power supply of the other system whose bus voltage cannot be synchronously controlled. It is configured to perform control to synchronize with. As a result, when using multiple uninterruptible power supplies of three or more systems, even if it becomes impossible to control the voltage output by one of the uninterruptible power supplies in one system, the system that can control the voltage can The voltage of each busbar can be synchronized to the voltage of the busbar of the system whose busbar voltage can no longer be controlled. As a result, when three or more uninterruptible power supplies are synchronously controlled to supply power to a load, even if the output of any of the uninterruptible power supplies cannot be synchronously controlled, the uninterruptible power supplies of three or more systems The outputs of each of the power supplies can be properly synchronized.

In the uninterruptible power supply system according to the first aspect, preferably, the synchronous control unit is in a state where it is unable to synchronously control the voltage of the bus bar due to malfunction of some of the components included in the uninterruptible power supply. When the operating state information that there is an uninterruptible power supply in another system is obtained, the voltage output by the power converter of the own system cannot be synchronously controlled on the bus of the uninterruptible power supply in the other system. It is configured to perform control in synchronization with the voltage of With this configuration, when multiple uninterruptible power supplies of three or more systems are used, any one of the uninterruptible power supplies will be able to handle problems caused by malfunction of some of the components included in the uninterruptible power supply. Even if it becomes impossible to control the output voltage, each uninterruptible power supply of the grid that can control the voltage will synchronize with the output voltage of the grid that can no longer control the voltage. . As a result, when three or more uninterruptible power supplies are synchronously controlled to supply power to three or more loads, some of the components included in the uninterruptible power supply may malfunction. Even if it becomes impossible to synchronously control the output of any of the uninterruptible power supplies in any system, the outputs of each of the three or more systems can be synchronized.

In the uninterruptible power supply system according to the first aspect, preferably, the information communication unit included in each of the uninterruptible power supplies includes an interface for preventing the voltage of the bus of the own system from being selected as a target for synchronization from other systems. Lock information is generated, and the operating state information includes information indicating that the information communication unit in the uninterruptible power supply of the own system has not generated interlock information. With this configuration, the synchronous control unit included in each uninterruptible power supply can adjust the voltage output by the power conversion unit of its own system based on the operating state information that includes interlock information, without including interlock information. Performs control to synchronize by switching to the bus voltage of the system that is outputting operating status information. As a result, the synchronization control unit of each of the three or more systems of uninterruptible power supplies can suppress synchronizing the output of each of the three or more systems of uninterruptible power supplies with the bus voltage of an inappropriate system.

In the uninterruptible power supply system according to the first aspect, preferably, the synchronization control unit included in each of the uninterruptible power supplies allows the uninterruptible power supplies of other systems to pass the voltage output from the power conversion unit of the own system through the bypass circuit. One is the operating state information that the uninterruptible power supply is being used to supply power, and the other is the operating state information that priority synchronization information has not been generated to ensure that the uninterruptible power source is preferentially selected as a target to be synchronized. , configured to perform control to synchronize with the voltage of the bus of the uninterruptible power supply having information including at least one of operating state information indicating that the own system is in a state where the voltage of the bus of the other system cannot be normally detected. be done. With this configuration, when the synchronization control unit included in each uninterruptible power supply is based on operating status information indicating that an uninterruptible power supply in another system is supplying power using a bypass circuit, the synchronization control unit included in each uninterruptible power supply can bypass the bypass circuit You can switch the synchronization target to the system that is issuing the operation status information that it is supplying power using the system. In addition, if the priority synchronization information is not generated for uninterruptible power supplies of other systems to be preferentially selected as objects to be synchronized, the priority synchronization information will not be generated. It is possible to prevent synchronization to systems that are not currently in use. In addition, if it is based on operating status information that indicates that the own system cannot normally detect the voltage of the bus of the other system, it can be determined that the own system cannot normally detect the voltage of the bus of the other system. You can switch the synchronization target to the system that is issuing the operating status information shown. As a result, the synchronous control unit of each of the three or more systems of uninterruptible power supplies determines whether the voltage output by the power converter of its own system is determined by the uninterruptible power supplies of other systems using the bypass circuit, based on the plurality of operating status information. Operation status information indicating that power is being supplied, operation status information indicating that priority synchronization information has not been generated so that uninterruptible power supplies of other systems are preferentially selected as targets for synchronization, and operation status information that indicates that power is being supplied. It is possible to appropriately synchronize with the voltage of the bus of a system having information including at least one of operating state information indicating that the system is in a state where the voltage of the bus of another system cannot be normally detected.

In the uninterruptible power supply system according to the first aspect, preferably, the operation status information indicating that there is an uninterruptible power supply of another system in which the bus voltage cannot be synchronously controlled is such that the uninterruptible power supply of the own system connects to the bypass circuit. Contains bypass power supply information indicating that power is being supplied using the bypass power supply. With this configuration, the synchronization control unit included in each uninterruptible power supply can be used as a synchronization target based on operating state information including bypass power supply information indicating that the bus voltage cannot be synchronously controlled. It can be synchronized to the grid bus voltage. As a result, the synchronization control unit of each uninterruptible power supply of three or more systems synchronizes the voltage output by the power conversion unit of its own system with the voltage of the bus of the system to which bypass power supply is being performed. The outputs of each of the uninterruptible power supplies can be synchronized.

In this case, preferably, the bypass circuit included in each uninterruptible power supply is turned off when power is supplied to the load via the power converter, and turned on when power is supplied to the load via the bypass circuit. The information communication unit included in each uninterruptible power supply, including the switch, is configured to generate and communicate bypass power supply information when the bypass switch of its own system is turned on, and The synchronization control unit included in each of the systems controls the voltage output by the power conversion unit of the system based on the bypass power supply information of the other system acquired from the information communication unit of the system, and the voltage output from the power conversion unit of the system itself, based on the bypass power supply information of the other system that outputs the bypass power supply information. It is configured to perform control in synchronization with the voltage of the bus of the uninterruptible power supply. With this configuration, the synchronous control unit included in each uninterruptible power supply will not be able to synchronously control the bus voltage based on the bypass power supply information generated by the simple ON or OFF operation of the bypass switch. It can be synchronized to the voltage of the bus of the system. As a result, the synchronous control unit of each of the three or more uninterruptible power supplies controls the voltage output by the power conversion unit of its own system based on the bypass power supply information generated by the simple on or off operation of the bypass switch. can be easily synchronized to the voltage of the appropriate grid busbar.

Preferably, in an uninterruptible power supply system, an information communication unit included in each of the uninterruptible power supplies generates interlock information for preventing the voltage of the bus of its own system from being selected as a target to be synchronized with other systems. , a synchronous control unit included in each of the uninterruptible power supplies determines whether the detection information is normal or not, and generates bus normal state information when it is determined that the voltage of the bus of the own system is normal; The information communication unit included in each uninterruptible power supply is configured to generate bus abnormal state information and communicate it to the information communication unit when it is determined that the voltage of the bus line of the own system is not normal, and the information communication unit included in each uninterruptible power supply Priority synchronization information is generated so that the voltage of the system is preferentially selected as a target for synchronization from other systems, and the uninterruptible power supply of the own system supplies power from other systems using a bypass circuit. Operation status information including bypass power supply information, bus normal status information, priority synchronization information, and bus voltage detection abnormality information indicating that uninterruptible power supplies of other systems are no longer able to detect bus voltage was acquired. In this case, the system is configured to generate interlock information to prevent the voltage of the bus of the own system from being selected as a target to be synchronized with other systems. With this configuration, each synchronization control section of the uninterruptible power supply can operate based on the interlock information generated based on the bypass power supply information, the bus normal state information, and the operation state information including the priority synchronization information. , you can switch the synchronization target. As a result, the synchronization control section of each of the three or more systems of uninterruptible power supplies can synchronize the voltage output by the power conversion section of its own system with the bus voltage of the system for which interlock information is not generated.

In this case, preferably, the information communication unit included in each uninterruptible power supply is configured to give priority when acquiring bus normal state information through communication with another system in a state where the own system is not generating interlock information. The synchronization control unit included in each uninterruptible power supply is configured to generate synchronization information, and the synchronization control unit included in each uninterruptible power supply transfers the voltage output from the power conversion unit of its own system to the uninterruptible power supply of other systems that output priority synchronization information. It is configured to perform control in synchronization with the voltage of the bus line of the power supply. With this configuration, each synchronization control section of the uninterruptible power supply can appropriately select which system's bus voltage is to be synchronized, based on the priority synchronization information. As a result, the synchronization control unit of each of the three or more systems of uninterruptible power supplies, based on the priority synchronization information, changes the voltage output by the power conversion unit of its own system to the voltage of the bus of the system outputting the priority synchronization information. can be easily synchronized.

In order to achieve the above object, a power supply method using an uninterruptible power supply system according to a second aspect of the present invention includes a power conversion section that converts power of an AC power source and outputs it to a load; A power supply method using an uninterruptible power supply system that supplies power to three or more loads by using three or more uninterruptible power supplies including a bypass circuit that directly outputs the a detection step that detects the voltage of the bypass circuit of the system and the voltage of the bus output from the power converter of the own system; detection information obtained based on the detection results of the detection step; and the operating state of the uninterruptible power supply. an information communication step for communicating operating state information regarding the system; and control for switching and synchronizing the voltage output from the power converter of the own system to the voltage of the bus of another system based on the detection information and the operating state information. The synchronous control step includes a synchronous control step in which the power converter of the own system is activated when the operation state information that there is an uninterruptible power supply of another system whose bus voltage cannot be synchronously controlled is obtained. Control is performed to synchronize the output voltage with the bus voltage of an uninterruptible power supply of another system whose bus voltage cannot be synchronously controlled.

In the power supply method using the uninterruptible power supply system according to the second aspect of the present invention, as described above, in the synchronous control step, there is an uninterruptible power supply of another system in which the voltage of the bus bar cannot be synchronously controlled. When this operating status information is obtained, control is performed to synchronize the voltage output by the power converter of the own system with the bus voltage of the uninterruptible power supply of the other system, where the bus voltage cannot be synchronously controlled. . As a result, when using multiple uninterruptible power supplies of three or more systems, even if it becomes impossible to control the voltage output by one of the uninterruptible power supplies, each of the systems that can control the voltage. can be synchronized with the bus voltage of the system whose bus voltage can no longer be controlled. As a result, when three or more uninterruptible power supplies are synchronously controlled to supply power to a load, even if the output of any of the uninterruptible power supplies cannot be synchronously controlled, the uninterruptible power supplies of three or more systems It becomes possible to provide a power supply method that can appropriately synchronize the outputs of each power source.

According to the present invention, when three or more systems of uninterruptible power supplies are synchronously controlled to supply power to a load, even if the output of any of the uninterruptible power supplies cannot be synchronously controlled, the three or more systems To provide an uninterruptible power supply system capable of appropriately synchronizing the output of each uninterruptible power supply.

1 is a diagram showing the configuration of an uninterruptible power supply system according to an embodiment of the present invention. FIG. 2 is a diagram showing a circuit configuration of an information communication section in an uninterruptible power supply according to an embodiment of the present invention. FIG. 6 is a diagram showing an example of each signal in a synchronization target switching operation according to an embodiment of the present invention. 7 is a flowchart for explaining a process of switching a synchronization target according to an embodiment of the present invention. FIG. 6 is a diagram showing an example of each signal in a synchronization target switching operation according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of an uninterruptible power supply system provided with a bypass section according to a modification of the present invention. It is a figure showing the composition of the uninterruptible power supply system which connects uninterruptible power supplies in parallel according to a modification of the present invention.

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

The configuration of an uninterruptible power supply system 200 according to this embodiment will be described with reference to FIG. 1.

(Configuration of uninterruptible power supply system 200)
As shown in FIG. 1, the uninterruptible power supply system 200 supplies power output from an AC power supply S to three systems of loads 50a through a first system A, a second system B, and a third system C. , 50b and 50c. 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. Further, the uninterruptible power supply system 200 includes, in the first system A, a first bypass circuit 30a and an uninterruptible power supply 100a. Further, the uninterruptible power supply system 200 includes, in the second system B, a first bypass circuit 30b and an uninterruptible power supply 100b. Further, the uninterruptible power supply system 200 includes, in the third system C, a first bypass circuit 30c 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 to 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 even in an emergency situation such as a power outage, and is also called a UPS (Uniterruptible Power System). 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 system that detects the voltage of the first bypass circuit 30a and the voltage of the 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 constituted by a voltage dividing resistor, etc., and detects the voltage of the first bypass circuit 30a supplied via the transformer 12a and the voltage of the connection point Aout on the bus bar 10a supplied via the transformer 11a. do. 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 section 22a is controlled so as to be synchronized with one of the voltages at the connection point Cout on the C-system bus 10c. 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 in the first system A, the bypass information communication unit 15a, and the information communication unit 9b in the second system B, and receives the results detected by the detection unit 7a. The detection information obtained based on the synchronization control unit 8a and the driving state information generated by the synchronization control unit 8a are communicated. Information communication units 9a, 9b, and 9c are connected in a loop. The information communication unit 9a communicates with other information communication units 9b and 9c connected in a loop to obtain detection information obtained based on the results detected by the detection unit 7b and the detection unit 7c, It is transmitted to the synchronization control section 8a. Note that the information communication sections 9a to 9c are composed of electronic circuits including logic circuits.

The information communication units 9a to 9c included in the uninterruptible power supplies 100a to 100c are configured to form a loop shape when viewed as a whole, and each of the information communication units 9a to 9c is connected to the other connected By mutually communicating information with the information communication units 9a to 9c, it is possible to obtain information output by all the information communication units 9a to 9c. Here, for example, assume that the 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 in the order of 9a, 9b, 9c, and 9d. Give an assumed explanation. 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.

Here, the internal configuration of the information communication section 9a will be explained using FIG. 2. The information communication section 9a is configured to include logic circuits L1 to L11, switches sw1L to sw3L, delay circuits L12 and L13, and a block diode L14. The information communication unit 9a receives a signal of "0" from each switch when the switch is in an open state (off state), and receives a signal of "1" when the switch is in a closed state (on state). A signal is input. Then, the information communication section 9a generates operating state information based on the state of each open/close switch input to a hardware circuit using logic circuits L1 to a11, etc., and communicates with information communication sections 9b and 9c of other systems. is configured to do so. Note that when the power output switch 16a is closed, the information communication unit 9a receives the power output switch 16a signal "1" and turns on sw1a and sw2a. Thereby, it is configured to communicate with the information communication sections 9b and 9c of other systems.

(Generation of bypass power supply information)
Further, the information communication unit 9a generates bypass power supply information indicating that power is being supplied using the first bypass circuit 30a in the first system A, which is the own system. The information communication unit 9a receives the power output switch 16a signal "1" and when the first bypass switch 34a is closed in a state where the switch sw2L is on, the information communication unit 9a outputs the bypass switch as bypass power supply information. 34a signal "1" is input. When the bypass switch 34a signal "1" is input, the information communication section 9a transmits the signal to the information communication sections 9b and 9c of other systems. Note that for the information communication unit 9b and the information communication unit 9c, the bypass power supply information acquired from the information communication unit 9a means that the uninterruptible power supply of the other system is in a state where the bus voltage cannot be synchronously controlled. included in the driving status information "Yes".

(Generation of interlock information)
Further, the information communication unit 9a generates interlock information for preventing the voltage of the bus 10a of the own system from being selected as a target for synchronization from other systems. The information communication unit 9a generates interlock information in a state where the power output switch 16a signal "1" is not input and the switches sw1L and sw2L are off. In addition, when at least one of the first bypass switches 34b and 34c of another system is turned on, the information communication unit 9a receives a first bypass switch 34b signal, which is bypass power supply information, from the information communication unit 9b or 9c. "1" or the first bypass switch 34c signal "1" is acquired, or the first bypass switch 34a of the own system is turned on and the first bypass switch 34a signal "1" is input , generates interlock information. Further, the information communication unit 9a generates interlock information when acquiring “priority synchronization information” to be described later from the information communication unit 9b or the information communication unit 9c. Here, the information communication unit 9a outputs "0" when the uninterruptible power supply 100a of the own system is in a state where it can normally detect the voltage of the bus bars 10b and 10c of the other system, and is in a state where it cannot normally detect the voltage. A bus voltage detection abnormality signal, which is bus voltage detection abnormality information, which outputs "1" when The information communication unit 9a also outputs an inverter switch signal “1” indicating that the inverter switch 6a is on, and an inverter power supplying 6a signal “1” indicating that the inverter unit 22a is supplying power. , the bus bar normal state signal "1" indicating that the voltage of the bus bar 10a is in a normal state, and one of the signals is not input, and the bus bar voltage detection abnormal signal of the own system is "0". , the interlock information is generated when the bus voltage detection signal "1" is acquired from at least one of the uninterruptible power supply 100b of the second system B and the uninterruptible power supply 100c of the third system C. Note that the interlock information is output from the logic circuit L7 as a signal of "1" by the delay circuit L12 as an input to the logic circuit L10 after a predetermined period of time has elapsed.

(Generation of priority synchronization information)
Further, the information communication unit 9a generates priority synchronization information for preferentially selecting a system having the right to be synchronized, which is a target for synchronizing the voltage of the bus 10a of the own system from another system. The information communication unit 9a detects that the bus voltage is detected in the first system A, which is its own system, in a state where the signal "1" output from the logic circuit L7 is not output. When the bus voltage detection signal "1" shown in FIG. signal is output. The signal "1" outputted from the logic circuit L10 is transmitted by the delay circuit L13 to the information communication section 9b and the information communication section 9c of other systems via the switch sw1L after a predetermined time has elapsed. Note that when the logic circuit L8 outputs a "1" signal, the switch sw3L is turned off by receiving a "0" signal from the logic circuit L9, so that the first system A, which is its own system, is turned off. To suppress generation of interlock information by outputting priority synchronization information.

As shown in FIG. 1, 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 10a. Moreover, the power conversion unit 20a is configured to be able to be disconnected from the AC power supply S and the load 50a by opening (turning off) the switches 4a, 5a and the inverter switch 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 the inverter switch 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. The inverter unit 22a is controlled by the synchronous control unit 8a to output desired AC power as a voltage at the connection point Aout on the bus bar 10a when DC power is supplied from the converter unit 21a or the power storage unit (not shown). be done. Note that the converter section 21a and the inverter section 22a are composed of an electronic circuit that is a combination of a diode bridge, a switch, and the like.

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 switch 40a is for switching to supply either the power at the connection point Aout on the bus 10a or the power at the connection point Bout on the bus 10a to the 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.

(Power supply method using synchronous control using uninterruptible power supply system 200)
Next, a synchronization target switching process in the uninterruptible power supply system 200 according to the present embodiment will be described with reference to FIGS. 2 to 5. This synchronization target switching operation is performed at arbitrary timing or every predetermined time.

In this explanation, first, each of the first system A, the second system B, and the third system C is operated without using the first bypass circuits 30a to 30c and the second bypass circuits 2a to 2c. Assume that power is supplied to the load side using power converters 20a, 20b, and 20c of power supplies 100a to 100c. Here, in this embodiment, the second system B has the right to be synchronized to be synchronized from the first system A and the third system C. Specifically, the synchronization control section 8a of the uninterruptible power supply 100a controls the operation of the inverter section 22a so as to be synchronized with the voltage at the connection point Bout on the bus 10b of the second system B. 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 Bout on the bus 10b of the second system B. Further, the power output switch 16a included in the first system A, the power output switch 16b included in the second system B, and the power output switch 16c included in the third system C are closed ( (on), and power is being supplied to the loads 50a-50c.

(When the uninterruptible power supply 100a supplies power using the first bypass circuit 30a due to an abnormality)
Here, a case where the uninterruptible power supply 100a supplies power using the first bypass circuit 30a due to an abnormality will be described using FIGS. 2 and 3. Note that the circuit in which "a" and "b" in FIG. 2 are exchanged and "system B" is replaced with "system A" is the information communication section 9b of the second system B, and the information communication section 9b is also explained. used for As a detection step, each of the uninterruptible power supplies 100a to 100c detects the voltages of the first bypass circuits 30a to 30c of its own system and the voltages of the buses 10a to 10c output from the power converters 20a to 20c of its own system. are doing. Further, each of the uninterruptible power supplies 100a to 100c communicates detection information based on the detection result and operating status information regarding the uninterruptible power supplies 100a to 100c as an information communication step.

Here, at t1 in FIG. 3, for example, if an abnormality occurs in the power converter 20a of the first system A and the first bypass switch 34a is closed (turned on) to perform bypass power supply, The first bypass switch 34a signal "1" as the operating state signal is input to the logic circuit L1 of the information communication section 9b. As a result, the logic circuit L2 outputs a signal of "1", and at time t2 in FIG. 3, the logic circuit L7 of the first system A outputs an interlock signal "1" which is interlock information. Further, as the interlock signal "1" is output, the priority synchronization signal, which is the priority synchronization information of the logic circuit L10 of the second system B, changes from "1" to "0". After that, in the information communication unit 9a of the first system A, since the signal input to the logic circuit L3 becomes "0", at time t3, the interlock signal which is the output of the logic circuit L7 as interlock information is It changes from "1" to "0". In the first system A, the priority synchronization signal changes from "0" to "1" at time t4 after the time set by the delay circuit L13 has elapsed due to the interlock information being released. In this way, the first system A acquires the right to be synchronized, which is a target to be synchronized, from another system, and as a synchronization control step, the power conversion unit 20a included in each of the uninterruptible power supplies 100a to 100c. The target for synchronization of the outputs of ~20c is switched from the voltage of the bus 10b of the second system B to the voltage of the bus 10a of the first system A.

(When the uninterruptible power supply 100a cannot observe the bus voltage of other systems due to an abnormality)
Next, a case where the uninterruptible power supply 100a cannot observe the bus voltage of another system due to an abnormality will be described using FIGS. 2, 4, and 5. Note that the circuit in which "a" and "b" in FIG. 2 are interchanged and "system B" is replaced with "system A" is the information communication section 9b, and the information communication section 9b will also be used in the explanation. When the synchronization target switching operation is started, as step S1 in FIG. Detection information on the voltage at the connection point Cout on the bus 10b of system C is acquired. Here, for example, if the synchronous control unit 8a is unable to detect the voltage at the connection point Bout on the bus 10b and the connection point Cout on the bus 10c of the other system due to a failure of the uninterruptible power supply 100a in the first system A. The processing of the operation of the uninterruptible power supply 100a in the first system A will be described. When the uninterruptible power supply 100a in the first system A has an abnormality in detecting the voltage at the bus bars 10b and 10c of the other system, a bus voltage detection abnormality signal "1" is input, and in step S1 of FIG. Proceed to Yes. Thereafter, the process proceeds to step S2.

In step S2, the uninterruptible power supply 100a of the first system A outputs an alarm. This alarm is output from the main body of the uninterruptible power supply 100a by sound, screen display, etc. so that the operator can notice the failure of the uninterruptible power supply 100a. Thereafter, the process proceeds to step S3.

In step S3, a synchronization right indicating that the voltage of the bus 10a of the first system A is to be synchronized from the uninterruptible power supplies 100b and 100c of other systems is acquired. Here, the operation when the voltage of the bus 10a of the first system A acquires the right to be synchronized will be specifically explained using FIGS. 3 and 5. First, at time t11 in FIG. 5, the synchronous control unit 8a of the uninterruptible power supply 100a in the first system A becomes unable to detect the voltage at the connection point Bout on the bus 10b and the connection point Cout on the bus 10c of the other system. Suppose that At this time, as shown in FIG. 2, "1" is input to the information communication unit 9b of the uninterruptible power supply 100b of the second system B to the other system bus voltage detection abnormality signal, and the interlock information is The signal L7 is output as "1" to the logic circuit L10 via the delay circuit L12. When the logic circuit L10 receives the signal "1" which is the interlock information, it outputs the priority synchronization information as the signal "0". As a result, at time t12 in FIG. 5, in the second system B, the interlock signal is switched from "0" to "1", and the priority synchronization signal is switched from "1" to "0". Further, since the priority synchronization signal in the second system B changed from "1" to "0", at time t13, the output signal of the logic circuit L3 of the information communication section 9a of the first system A became "0", The interlock signal of the information communication section 9a switches from "1" to "0". As the interlock information (interlock signal "1") is released, the information communication section 9a of the first system A outputs a priority synchronization signal from the logic circuit L10, and the time set by the delay circuit L13 is delayed. After the elapse of time, at time t14, the first system A acquires the right to be synchronized. This completes the process of switching the synchronization target.

Next, the operation of the uninterruptible power supply 100b of the second system B when the uninterruptible power supply 100a cannot observe the bus voltage of another system due to an abnormality will be described. The information communication unit 9b in the uninterruptible power supply 100b of the second system B receives detection information on the voltages at the connection point Aout on the bus 10a of the first system A and the connection point Cout on the bus 10b of the third system C. get. If the uninterruptible power supply 100b in the second system B can normally detect the bus voltage of the other system, it selects No in the flowchart of FIG. 4 and proceeds to the process of step S4.

In step S4, the information communication unit 9b of the uninterruptible power supply 100b determines whether the uninterruptible power supplies 100a and 100c of the other systems can detect the bus voltage of the other system. The information communication unit 9b of the uninterruptible power supply 100b detects that the other system bus voltage detection abnormal signal "1" has been input in the first system A, indicating that the bus voltage of the other system is not normally detected. The information is obtained through communication, and Yes is selected to proceed to the process of step S5.

In step S5, the information communication unit 9b of the uninterruptible power supply 100b determines whether or not the own system has the right to be synchronized, which indicates that the system is to be synchronized with another system. The information communication unit 9b of the uninterruptible power supply 100b outputs the signal "1" which is priority synchronization information from the logic circuit L10, and since it is synchronized from other systems, it selects Yes and proceeds to the process of step S6.

In step S6, the information communication unit 9b of the uninterruptible power supply 100b operates so that its own system relinquishes the right to be synchronized . "1" is input to the other system bus voltage detection abnormality signal, and the interlock information is output as "1" from the logic circuit L7 to the logic circuit L10 via the delay circuit L12. The logic circuit L10, which had been outputting the priority synchronization information "1", switches the priority synchronization information from "1" to "0" based on the input interlock information. As a result, the priority synchronization information becomes "0" and the right to be synchronized is abandoned. After that, the synchronization target switching process is completed.

(When the uninterruptible power supplies 100a to 100c are normally detecting the bus voltage of other systems)
Next, a case will be described in which the uninterruptible power supplies 100a to 100c are operating normally in each of the systems A to C. The operation of the uninterruptible power supply 100a in the first system A will be explained. When the synchronization target switching operation is started, as step S1 in FIG. Detection information on the voltage at the connection point Cout on the bus 10b of system C is acquired. When the information communication unit 9a of the uninterruptible power supply 100a in the first system A can successfully detect the bus voltage of another system, a bus voltage detection abnormal signal "0" is input to the logic circuits L5 and L6. Then, the process goes to No in the flowchart of FIG. Thereafter, the process proceeds to step S4.

In step S4, the information communication unit 9a of the first system A communicates with the information communication unit 9c of the uninterruptible power supply 100b of the other system and the information communication unit 9c of the uninterruptible power supply 100b of the other system. Obtain the bus voltage detection abnormality signal of 100c. If there is no abnormality in the uninterruptible power supplies 100b and 100c of the other systems, the information communication unit 9a of the first system A outputs the bus voltage detection abnormality signal "0" from both the second system B and the third system C. is acquired and input to the logic circuit L5, the flowchart in FIG. 4 goes to No, and the synchronization target switching operation ends. Specifically, the information communication unit 9a transmits the interlock signal "0" of the logic circuit L7, which is interlock information, based on the fact that the bus detection abnormality signal "0" of the other system is input to the logic circuit L5. The priority synchronization information "0" is generated from the logic circuit L10. As a result, the operation ends without switching the synchronization target.

As described above, each of the systems A to C uses the voltage of the own system to the bus line of the other system even when power is supplied to the loads 50a to 50c using three or more uninterruptible power supplies 100a to 100c. An operation is performed to switch the synchronization target to the voltage of the buses 10a to 10c of the system that cannot be synchronized to the voltages of the buses 10a to 10c.

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

The uninterruptible power supply system 200 of this 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. An uninterruptible power supply system 200 that supplies power to three or more loads 50a to 50c using three or more uninterruptible power supplies 100a to 100c including first bypass circuits 30a to 30c, the uninterruptible power supply system 200 supplying power to three or more loads 50a to 50c. Each of the detection units detects the voltage of the first bypass circuits 30a to 30c of the own system in the uninterruptible power supplies 100a to 100c, and the voltage of the buses 10a to 10c output from the power converters 20a to 20c of the own system. 7a to 7c, information communication units 9a to 9c that communicate detection information acquired based on the detection results of the detection units 7a to 7c, and operating status information regarding the operating status of the uninterruptible power supplies 100a to 100c, and detection information. and synchronization control units 8a to 8c, which perform control to switch and synchronize the voltages output by the power converters 20a to 20c of the own system to the voltages of the buses 10a to 10c of other systems, based on the operating state information. When the synchronous control units 8a to 8c acquire operating status information indicating that there are uninterruptible power supplies 100a to 100c in other systems in which the voltages of the bus bars 10a to 10c cannot be synchronously controlled, the synchronous control units 8a to 8c control the voltages of the own system. Control is performed to synchronize the voltages output by the power converters 20a to 20c with the voltages of the buses 10a to 10c of the uninterruptible power supplies 100a to 100c of other systems in which the voltages of the buses 10a to 10c cannot be synchronously controlled. It is composed of As a result, when using multiple uninterruptible power supplies 100a to 100c in three or more systems, even if it becomes impossible to control the voltage output by any of the uninterruptible power supplies 100a to 100c, the voltage can be controlled. It is possible to synchronize the voltage of each bus 10a to 10c of the system in which the voltage of the bus 10a to 10c can be controlled with the voltage of the bus 10a to 10c of the system in which the voltage of the bus 10a to 10c cannot be controlled. As a result, when three or more systems of uninterruptible power supplies 100a to 100c are synchronously controlled to supply power to loads 50a to 50c, if the output of any of the uninterruptible power supplies 100a to 100c cannot be synchronously controlled. Also, the outputs of three or more systems of uninterruptible power supplies 100a to 100c can be appropriately synchronized.

In the uninterruptible power supply system 200 of this embodiment, the synchronization control units 8a to 8c synchronize the voltages of the bus bars 10a to 10c due to malfunction of some of the components included in the uninterruptible power supplies 100a to 100c. When the operating status information indicating that there are uninterruptible power supplies 100a to 100c in other systems that are in an uncontrollable state is obtained, the voltages output by the power converters 20a to 20c of the own system are changed to the voltages of the bus lines 10a to 10c. It is configured to perform control to synchronize the voltages of the bus lines 10a to 10c of the uninterruptible power supplies 100a to 100c of other systems that are in a state where synchronous control is not possible. As a result, when using multiple uninterruptible power supplies 100a to 100c of three or more systems, some of the components included in the uninterruptible power supplies 100a to 100c may malfunction in any of the uninterruptible power supplies 100a to 100c. Even if it becomes impossible to control the voltage to be output due to the occurrence of this problem, each of the uninterruptible power supplies 100a to 100c in the system that can control the voltage becomes unable to control the voltage. synchronized with the output voltage of the grid. As a result, when three or more systems of uninterruptible power supplies 100a to 100c are synchronously controlled to supply power to three or more systems of loads 50a to 50c, some of the components included in the uninterruptible power supplies 100a to 100c are To synchronize the output of each of the three or more systems of uninterruptible power supplies 100a to 100c even if the uninterruptible power supplies 100a to 100c of any of the systems cannot synchronously control the output due to malfunction of the uninterruptible power supplies 100a to 100c. I can do it.

Further, in this embodiment, the information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c are configured to prevent the voltages of the buses 10a to 10c of the own system from being selected as targets for synchronization from other systems. The interlock information is generated, and the operating state information includes information that the information communication units 9a to 9c in the uninterruptible power supplies 100a to 100c of the own system have not generated interlock information. Thereby, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c control the voltages output by the power conversion units 20a to 20c of the own system based on the operating state information including the interlock information. Control is performed to switch and synchronize the voltage of the buses 10a to 10c of the system that outputs operating state information that does not include lock information. As a result, the synchronous control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c control the output of each of the three or more systems of uninterruptible power supplies 100a to 100c to the buses 10a to 10c of the inappropriate system. It is possible to suppress synchronization with the voltage.

Furthermore, in this embodiment, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c convert the voltages output by the power conversion units 20a to 20c of the own system to the uninterruptible power supplies 100a to 100c of other systems. is supplying power using the first bypass circuits 30a to 30c, and priority information to ensure that the uninterruptible power supplies 100a to 100c of other systems are preferentially selected as objects to be synchronized. A device having information including at least one of operating state information indicating that synchronization information has not been generated and operating state information indicating that the own system cannot normally detect the voltage of the bus bars 10a to 10c of other systems. It is configured to perform control in synchronization with the voltages of the bus lines 10a to 10c of the power outage power supplies 100a to 100c. Thereby, the bus bars 10a to 10c of the uninterruptible power supplies 100a to 100c have information including at least one of the operating state information indicating that the own system is in a state where the voltage of the bus bars 10a to 10c of the other system cannot be detected normally. It is configured to perform control in synchronization with the voltage of With this configuration, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c can cause the uninterruptible power supplies 100a to 100c of other systems to supply power using the first bypass circuits 30a to 30c. In the case where the synchronization target is based on the operating state information indicating that power is being supplied using the first bypass circuits 30a to 30c, the synchronization target can be switched to the system that has issued the operating state information that power is being supplied using the first bypass circuits 30a to 30c. In addition, if the priority synchronization information is not generated for the uninterruptible power supplies 100a to 100c of other systems to be preferentially selected as objects to be synchronized, the priority synchronization information It is possible to prevent synchronization to systems that have not been generated. In addition, if the own system is based on the operating status information indicating that the voltage of the bus bars 10a to 10c of the other system cannot be detected normally, the own system normally detects the voltage of the bus bars 10a to 10c of the other system. It is possible to switch the synchronization target to a system that is issuing operational status information indicating that it is not possible. As a result, each of the synchronous control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c selects the voltage output from the power conversion units 20a to 20c of the own system from among the plurality of operating state information. Operating state information indicating that the uninterruptible power supplies 100a to 100c are supplying power using the first bypass circuits 30a to 30c and uninterruptible power supplies 100a to 100c of other systems are preferentially selected as objects to be synchronized. At least one of operating state information indicating that priority synchronization information has not been generated to ensure that the priority synchronization information is not generated, and operating state information indicating that the own system cannot normally detect the voltage of the bus bars 10a to 10c of other systems. It is possible to appropriately synchronize the voltage of the bus lines 10a to 10c of the system having information including the information.

Further, in this embodiment, the operation state information indicating that there are uninterruptible power supplies 100a to 100c of other systems in which the voltages of the buses 10a to 10c cannot be synchronously controlled means that the uninterruptible power supplies 100a to 100c of the own system are 1 includes bypass power supply information indicating that power is being supplied using the bypass circuits 30a to 30c. As a result, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c, based on the operating state information including the bypass power supply information indicating that the voltages of the buses 10a to 10c cannot be synchronously controlled, It is possible to synchronize with the voltage of the bus lines 10a to 10c of the system to be synchronized. As a result, each of the synchronous control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c transfers the voltage output from the power conversion units 20a to 20c of the own system to the buses 10a to 10a of the system to which bypass power supply is being performed. By synchronizing with the voltage of 10c, the outputs of three or more systems of uninterruptible power supplies 100a to 100c can be synchronized.

Further, in this embodiment, the first bypass circuits 30a to 30c included in each of the uninterruptible power supplies 100a to 100c are turned off when power is supplied to the loads 50a to 50c via the power conversion units 20a to 20c, Information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c, including first bypass switches 34a to 34c that are turned on when power is supplied to the loads 50a to 50c via the first bypass circuits 30a to 30c. is configured to generate and communicate bypass power supply information when the first bypass switches 34a to 34c of its own system are turned on, and is a synchronous control unit included in each of the uninterruptible power supplies 100a to 100c. 8a to 8c, based on the bypass power supply information of other systems acquired from the information communication units 9a to 9c of the own system, convert the voltages output by the power converters 20a to 20c of the own system to the voltages output by the power converters 20a to 20c of the own system, and the voltages output from the other systems that output the bypass power supply information. It is configured to perform control in synchronization with the voltages of bus bars 10a to 10c of uninterruptible power supplies 100a to 100c. As a result, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c operate on the bus line based on the bypass power supply information generated by the simple operation of turning on or off the first bypass switches 34a to 34c. The voltages of the buses 10a to 10c can be synchronized with the voltages of the bus lines 10a to 10c of the system, which cannot be synchronously controlled. As a result, the synchronous control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c operate based on the bypass power supply information generated by the simple operation of turning on or off the first bypass switches 34a to 34c. , it is possible to easily synchronize the voltages output by the power converters 20a to 20c of the own system to the voltages of the buses 10a to 10c of the appropriate system.

Further, in this embodiment, the synchronous control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c determine whether the detection information is normal, and the voltages of the buses 10a to 10c of the own system are normal. When it is determined that the voltage of the bus bars 10a to 10c of the own system is not normal, the bus abnormal state information is generated and communicated to the information communication units 9a to 9c. The information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c ensure that the voltage of the bus bars 10a to 10c of the own system is preferentially selected as a target to be synchronized with other systems. Bypass power supply information indicating that the uninterruptible power supplies 100a to 100c of the own system are feeding power using the first bypass circuits 30a to 30c from other systems, and bus normal state information, When operating state information including priority synchronization information and bus voltage detection abnormality information indicating that the uninterruptible power supplies 100a to 100c of other systems cannot detect the voltage of the buses 10a to 10c is obtained, It is configured to generate interlock information to prevent the voltages of the buses 10a to 10c from being selected as targets for synchronization from other systems. As a result, each of the synchronization control units 8a to 8c of the uninterruptible power supplies 100a to 100c can operate based on bypass power supply information, bus normal state information, priority synchronization information, and bus voltage detection abnormality information. Synchronization targets can be switched based on the interlock information generated. As a result, each of the synchronous control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c transfers the voltage output from the power conversion units 20a to 20c of its own system to the bus line of the system for which interlock information has not been generated. It can be synchronized with the voltages 10a to 10c.

Further, in this embodiment, the information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c communicate bus normal state information by communicating with other systems in a state where the own system is not generating interlock information. The synchronization control units 8a to 8c included in each of the uninterruptible power supplies 100a to 100c are configured to generate priority synchronization information when the power conversion units 20a to 20c of the own system output It is configured to perform control to synchronize the voltage with the voltage of bus lines 10a to 10c of uninterruptible power supplies 100a to 100c of other systems outputting priority synchronization information. Thereby, based on the priority synchronization information, each of the synchronization control units 8a to 8c of the uninterruptible power supplies 100a to 100c can appropriately select the voltage of the bus bars 10a to 10c of which system to be synchronized. can. As a result, each of the synchronization control units 8a to 8c of the three or more systems of uninterruptible power supplies 100a to 100c adjusts the voltage output by the power conversion units 20a to 20c of its own system based on the priority synchronization information. It can be easily synchronized with the voltage of the bus lines 10a to 10c of the output system.

[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 embodiment described above, an example of the uninterruptible power supply system 200 that supplies power to three systems of loads 50a to 50c using three systems of uninterruptible power supplies 100a to 100c was shown, but the present invention is not limited to this. I can't. The present invention may be configured to supply power to four or more loads 50a to 50c using four or more uninterruptible power supplies, and depending on the number of loads 50a to 50c, the uninterruptible power supply It is better to increase the number of

Further, in the above embodiment, an example was shown in which each of the systems A to C includes the second bypass circuit 2a separately from the uninterruptible power supplies 100a to 100c, but the present invention is not limited to this. 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 above embodiment, an example of the uninterruptible power supply system 200 that supplies power to the three loads 50a to 50c using the three uninterruptible power supplies 100a to 100c is shown, but the present invention is not limited to this. I can't. In the present invention, as in the uninterruptible power supply system 201 shown in the modified example of FIG. 6, each of the systems A to C is provided separately from the uninterruptible power supplies 100a to 100c, and A second bypass circuit 2a that is connected to the bus bars 10a to 10c on the loads 50a to 50c side and outputs the power of the AC power source S directly to the loads 50a to 50c, and a bypass that detects the voltage of the second bypass circuits 2a to 2c. It further includes bypass sections 110a to 110c including voltage detection sections 13a to 13c and bypass information communication sections 15a to 15c that communicate detection information obtained by the bypass voltage detection sections 13a to 13c, and bypass information communication sections 15a to 110c. 15c may be configured to communicate information by being connected to other information communication units 9a to 9c.

Further, in the above embodiment, an example was shown in which the uninterruptible power supplies 100a to 100c are operated singly in each of the systems A to C, but the present invention is not limited to this. In the present invention, two uninterruptible power supplies 101a, 102a, 101b, 102b, 101c, and 102c are connected in parallel in each of systems A to C, as in an uninterruptible power supply system 202 shown in a modified example of FIG. Alternatively, three or more units may be connected in parallel.

Further, in the above embodiment, an example was shown in which the information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c are connected in a loop to communicate, but the present invention is not limited to this. In the present invention, it is sufficient that each of the information communication units 9a to 9c included in each of the uninterruptible power supplies 100a to 100c can communicate with each other. It may be configured as follows.

Furthermore, in the above embodiment, the synchronous control units 8a to 8c are unable to synchronously control the voltages of the bus bars 10a to 10c due to malfunction of some of the constituent members included in the uninterruptible power supplies 100a to 100c. When the operating status information indicating that there are uninterruptible power supplies 100a to 100c in other systems is obtained, the voltages output by the power converters 20a to 20c of the own system cannot be synchronously controlled to the voltages of the buses 10a to 10c. Although an example has been shown in which control is performed to synchronize the voltages of the bus lines 10a to 10c of the uninterruptible power supplies 100a to 100c of other systems, the present invention is not limited to this. In the present invention, the operating state is such that there are uninterruptible power supplies 100a to 100c of other systems in which the voltages of the buses 10a to 10c cannot be synchronously controlled by maintenance or replacement of a part of the uninterruptible power supplies 100a to 100c. When the information is acquired, the voltages output by the power converters 20a to 20c of the own system can be controlled from the bus bars 10a to 10a of the uninterruptible power supplies 100a to 100c of other systems, which are in a state in which the voltages of the bus bars 10a to 10c cannot be synchronously controlled. Control may be performed to synchronize with the voltage of 10c.

Further, in the above embodiment, an example was shown in which the information communication units 9a to 9c generate various information by a hardware circuit using logic circuits L1 to a11 and delay circuits L12 and a13. Not limited to. In the present invention, the information communication units 9a to 9c or a separately provided control unit may be configured to include a CPU, and may be configured to generate various information by a program based on each signal.

7a, 7b, 7c detection section 8a, 8b, 8c synchronous control section 9a, 9b, 9c information communication section 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-202a, 200b-202b, 200c-202c Uninterruptible power supply system L1-L11 Logic circuit L12, L13 Delay circuit L14 Block Diode A First system B Second system C Third system S AC power supply

Claims (9)

A power conversion unit that converts the power of the AC power source and outputs it to the load, and a bypass circuit that directly outputs the power of the AC power source to the load. An uninterruptible power supply system that supplies power to
Each of the uninterruptible power supplies includes:
a detection unit that detects the voltage of the bypass circuit of the own system in the uninterruptible power supply and the voltage of the bus output from the power conversion unit of the own system;
an information communication unit that communicates detection information acquired based on the detection result of the detection unit and operating state information regarding the operating state of the uninterruptible power supply;
a synchronization control unit that performs control to switch and synchronize the voltage output from the power conversion unit of the own system to the voltage of the bus of another system based on the detection information and the operating state information;
When the synchronization control unit obtains the operating state information indicating that there is the uninterruptible power supply of another system in which the voltage of the bus cannot be synchronously controlled, the synchronization control unit adjusts the voltage output by the power conversion unit of the own system. An uninterruptible power supply system configured to perform control to synchronize the voltage of the bus bar with the voltage of the bus bar of the uninterruptible power supply of another system in which the voltage of the bus bar cannot be synchronously controlled. The synchronization control unit controls the operation in which the uninterruptible power supply of another system is in a state where the voltage of the bus cannot be synchronously controlled due to malfunction of some of the constituent members included in the uninterruptible power supply. Control that synchronizes the voltage output by the power converter of the own system with the voltage of the bus of the uninterruptible power supply of the other system in which the voltage of the bus cannot be synchronously controlled when the status information is acquired. The uninterruptible power supply system according to claim 1, configured to perform the following. The information communication unit included in each of the uninterruptible power supplies generates interlock information for preventing the voltage of the bus of the own system from being selected as a target for synchronization from other systems,
The uninterruptible power supply system according to claim 1, wherein the operating state information includes information that the information communication unit in the uninterruptible power supply of the own system has not generated the interlock information. The synchronous control unit included in each of the uninterruptible power supplies controls the voltage output by the power conversion unit of its own system,
The operating state information indicating that the uninterruptible power supply of another system is supplying power using the bypass circuit and the uninterruptible power supply of another system are preferentially selected as a target to be synchronized. Information including at least one of the operating state information indicating that priority synchronization information has not been generated, and the operating state information indicating that the own system cannot normally detect the voltage of the bus of another system. The uninterruptible power supply system according to claim 1, wherein the uninterruptible power supply system is configured to perform control in synchronization with the voltage of the bus of the uninterruptible power supply. The operation status information that there is the uninterruptible power supply of another system in which the voltage of the bus cannot be synchronously controlled is a bypass state that the uninterruptible power supply of the own system is supplying power using the bypass circuit. The uninterruptible power supply system according to claim 1, comprising power supply information. The bypass circuit included in each of the uninterruptible power supplies is a bypass that is turned off when power is supplied to the load via the power converter and turned on when power is supplied to the load via the bypass circuit. including switchgear,
The information communication unit included in each of the uninterruptible power supplies is configured to generate and communicate the bypass power supply information when the bypass switch of the own system is turned on,
The synchronization control unit included in each of the uninterruptible power supplies adjusts the voltage output by the power conversion unit of the own system based on the bypass power supply information of the other system acquired from the information communication unit of the own system. The uninterruptible power supply system according to claim 5, wherein the uninterruptible power supply system is configured to perform control to synchronize with the voltage of the bus of the uninterruptible power supply of another system that outputs bypass power supply information. The synchronization control unit included in each of the uninterruptible power supplies determines whether or not the detection information is normal, and transmits bus normal state information when determining that the voltage of the bus in its own system is normal. and is configured to generate bus bar abnormal state information and communicate it to the information communication unit when it is determined that the voltage of the bus bar of the own system is not normal;
The information communication unit included in each of the uninterruptible power supplies generates priority synchronization information for preferentially selecting the voltage of the bus of its own system as a target to be synchronized with other systems, and From the system, bypass power supply information indicating that the uninterruptible power supply of the own system is supplying power using the bypass circuit, the bus normal state information, the priority synchronization information, and the uninterruptible power supply of the other system When the operating state information including bus voltage detection abnormality information indicating that the bus voltage cannot be detected is acquired, the voltage of the bus of the own system is not selected as a target for synchronization from other systems. The uninterruptible power supply system according to claim 3, configured to generate the interlock information for. The information communication unit included in each of the uninterruptible power supplies performs the priority synchronization when acquiring the bus normal state information through communication with another system in a state where the own system does not generate the interlock information. configured to generate information;
The synchronization control unit included in each of the uninterruptible power supplies changes the voltage output by the power conversion unit of its own system to the voltage of the bus of the uninterruptible power supplies of other systems that output the priority synchronization information. The uninterruptible power supply system according to claim 7, configured to perform synchronizing control. A power conversion unit that converts the power of the AC power source and outputs it to the load, and a bypass circuit that directly outputs the power of the AC power source to the load. A power supply method using an uninterruptible power supply system that supplies power to
a detection step of detecting the voltage of the bypass circuit of the own system in the uninterruptible power supply and the voltage of the bus output from the power converter of the own system;
an information communication step of communicating detection information obtained based on the detection result of the detection step and operating state information regarding the operating state of the uninterruptible power supply;
a synchronization control step of performing control to switch and synchronize the voltage output by the power converter of the own system to the voltage of the bus of another system, based on the detection information and the operating state information;
The synchronous control step includes controlling the voltage output by the power converter of the own system when the operating state information is obtained that there is the uninterruptible power supply of another system in which the voltage of the bus cannot be synchronously controlled. A power supply method using an uninterruptible power supply system that performs control to synchronize the voltage of the bus bar of the uninterruptible power supply of another system in which the voltage of the bus bar cannot be synchronously controlled.

Images