JP5768165B2 - Uninterruptible power supply system - Google Patents

Description

  The present invention relates to an uninterruptible power supply system capable of operating a plurality of uninterruptible power supply apparatuses synchronously.

  Patent Document 1 discloses an uninterruptible power supply that can recover power supply in a short time even if the uninterruptible power supply fails, and can reduce the risk of a load stoppage due to a power failure of the bypass power supply within the time required for repair of the uninterruptible power supply. A power supply system is disclosed. It opens and closes two uninterruptible power supplies that output uninterruptible AC power, two sets of switching circuits that switch to a bypass power supply in the event of a failure of the uninterruptible power supply, and two sets of switching circuits. It has 4 switches, and these switches allow you to select the connection between 2 sets of switching circuits and 2 sets of loads, and also have a switch that opens and closes the outputs of 2 uninterruptible power supplies. It is configured so that either single-unit operation or parallel operation of the apparatus can be selected.

  FIG. 8 is a schematic configuration diagram for explaining problems in the conventional uninterruptible power supply system similar to the technical idea disclosed in Patent Document 1. FIG. 8 includes an A system and a B system, and includes a switching circuit 10 that switches between the two systems.

  The system A system includes an AC input power supply 2a, a commercial power supply 3a, a maintenance circuit including an uninterruptible power supply 1a, and a maintenance circuit breaker 18a. The uninterruptible power supply 1a supplies the AC power of the AC input power source 2a to the converter 5a via the AC input circuit breaker 4a, converts it into DC power, and supplies the converted DC power to the storage battery 6a. 6a is charged, DC power is supplied to the inverter 7a, converted into AC power by the inverter 7a, and this converted AC power is passed through the inverter side contactor 8a and the output contactor 9a via the switching circuit 10. AC power can be supplied to the load 11.

  The inverter 7a having the bypass circuit as described above is operated in synchronism with the commercial power supply 3a so that the power supply can be switched without interruption even in the case of a power supply switching operation in the event of a failure. It has a detector 15a, a synchronization detection circuit 16a, and a synchronization control circuit 17a, and is configured to synchronize the phase and frequency of the inverter 7a with the bypass circuit.

  Here, the synchronization detection circuit 16a is input to the synchronization control circuit 17a as a synchronization signal when the output of the detection circuit 15a for detecting the bypass voltage satisfies the output specification of the uninterruptible power supply 1a. If it is not, a free-running signal (equivalent to a commercial frequency of 50 Hz or 60 Hz) is input to the synchronous control circuit 17a. The synchronization control circuit 17a generates a phase signal from the output of the synchronization detection circuit 16a by a method called PLL (Phase Locked Loop) and inputs the phase signal to the inverter 7a.

  Further, a maintenance circuit breaker 18a is added in order to enable power supply from the commercial power supply 3a to the load 11 for inspection including the common part of the uninterruptible power supply 1a.

  The B system is configured similarly to the A system described above. That is, a maintenance circuit including an AC input power source 2b, a commercial power source 3b, an uninterruptible power supply 1b, and a maintenance / maintenance circuit breaker 18b is provided.

  The uninterruptible power supply 1b supplies the AC power from the AC input power source 2b to the converter 5b via the AC input circuit breaker 4b, converts it into DC power, and supplies the converted DC power to the storage battery 6b. 6b is charged, DC power is supplied to the inverter 7b, converted into AC power by the inverter 7b, and this converted AC power is passed through the inverter side contactor 8b and the output contactor 9b via the switching circuit 10. AC power can be supplied to the load 11.

  The inverter 7b of the uninterruptible power supply 1b having the bypass circuit as described above operates in synchronization with the commercial power supply 3b so that the power supply can be switched without interruption even in the event of a power switching operation in the event of a failure. The voltage detector 15b, the synchronization detection circuit 16b, and the synchronization control circuit 17b are provided so as to synchronize the phase and frequency of the inverter 7b with the bypass circuit.

  Here, if the output of the detection circuit 15b for detecting the bypass voltage satisfies the output specification of the uninterruptible power supply 1b, the synchronization detection circuit 16b is input to the synchronization control circuit 17b as a synchronization signal. If it is not, a free-running signal (equivalent to a commercial frequency of 50 Hz or 60 Hz) is input to the synchronous control circuit 17b. The synchronization control circuit 17b generates a phase signal from the output of the synchronization detection circuit 16a by a method called PLL and inputs it to the inverter 7b.

  Further, a maintenance circuit breaker 18b is added in order to enable power supply from the commercial power supply 3b to the load 11 for inspection including the common part of the uninterruptible power supply 1b.

  In addition to the configuration described above, a voltage control unit (not shown) that generates an output voltage command for the inverters 7a and 7b so that the output voltage of the inverters 7a and 7b matches the output voltage reference, and a voltage control unit Needless to say, a gate control circuit (not shown) for controlling the gates of the switching elements constituting the inverters 7a and 7b based on the inverter output voltage command is provided.

JP 2002-27684 A

  The conventional example of FIG. 8 described above has the following problems. That is, in the uninterruptible power supply system aiming at high reliability, when one uninterruptible power supply device, for example, 1a becomes a self-running operation due to a power failure of the commercial power supply 3a, the switching circuit 10 is in an asynchronous state. Therefore, there are cases where it does not make sense to have two outputs of the uninterruptible power supply 1a, 1b with respect to the load 11.

  When the switching circuit 10 is switched from the uninterruptible power supply 1a to the uninterruptible power supply 1b, for example, in a state where the two input power supplies become asynchronous, an instantaneous disconnection switching operation is performed, so that an adverse effect on the load 11 can be considered.

  The present invention was made to eliminate the above-mentioned drawbacks, and an uninterruptible power supply system that can perform uninterruptible switching operation even for power feeding switching operation and can improve the reliability of load power feeding. The purpose is to provide.

  In order to achieve the above-mentioned object, the present invention is provided with a synchronization means in which the first uninterruptible power supply and the second uninterruptible power supply always synchronize with the load in a general conventional uninterruptible power supply system. It is a thing.

  According to the present invention, it is possible to provide an uninterruptible power supply system that can perform an uninterruptible switching operation even for a power feeding switching operation, and can improve the reliability of load power feeding.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram for demonstrating Embodiment 1 of the uninterruptible power supply system in this invention. The schematic block diagram for demonstrating the synchronous determination circuit of FIG. The schematic block diagram for demonstrating the synchronous detection circuit of FIG. The time chart for demonstrating the operation | movement of FIG. The schematic block diagram for demonstrating Embodiment 2 of the uninterruptible power supply system in this invention. FIG. 6 is a schematic configuration diagram for explaining the synchronization detection circuit of FIG. 5. The schematic block diagram for demonstrating Embodiment 3 of the uninterruptible power supply system in this invention. The schematic block diagram for demonstrating the conventional problem.

[Embodiment 1]
(Constitution)
Embodiment 1 of the present invention will be described below with reference to FIGS.

1 is provided with synchronization determination circuits 21a and 21b and voltage detectors 15aa and 15bb, which will be described later, in the A system and the B system of the conventional example of FIG. 8, respectively, so that the uninterruptible power supply devices 1a and 1b are always synchronized. This is an uninterruptible power supply system of a single-machine bypass system that is configured so that the power can be always supplied to the load 11.

  Specifically, the output voltage (load voltage) of the A system is detected by the voltage detector 15aa, and the detected output voltage detection signal 22a is input to the synchronization detection circuit 16b of the B system.

  The synchronization determination circuit 21b receives a commercial power supply voltage abnormality signal (bypass abnormality signal) 23b, which is an output of the synchronization detection circuit 16b, and the synchronization detection circuit 16b further receives a synchronization command 24a from the synchronization determination circuit 21a of the A system. Is entered.

  The synchronization determination circuit 21b receives the commercial power supply voltage abnormality signal 26A and the B-system priority signal 26B from the A-system synchronization determination circuit 21a, and the B-system commercial power supply voltage abnormality signal 25A and the A-system synchronization determination circuit 21a. The A system priority signal 25B is output.

  The configuration described above is the B-system synchronization detection circuit 16b and the synchronization determination circuit 21b. Similarly, the A-system synchronization detection circuit 16a and the synchronization determination circuit 21a are also configured. That is, the output voltage (load voltage) of the B system is detected by the voltage detector 15bb, and the detected output voltage detection signal 22b is input to the synchronization detection circuit 16a of the A system. The synchronization determination circuit 21a receives a commercial power supply voltage abnormality signal (bypass abnormality signal) 23a, which is an output of the synchronization detection circuit 16a, and the synchronization detection circuit 16a further receives a synchronization command 24b from the synchronization determination circuit 21b of the B system. Is entered. The synchronization determination circuit 21a receives the commercial power supply voltage abnormality signal 25A and the other system priority signal 25B from the A-system synchronization determination circuit 21b, and the B-system commercial power supply voltage abnormality signal 26A and the B-system synchronization determination circuit 21b. The B system priority signal 26B is output.

  The rest of the configuration is the same as that of the conventional example shown in FIG.

FIG. 2 is a diagram for explaining a configuration example of the synchronization determination circuits 21a and 21b in FIG. 1. Here, the synchronization determination circuit 21a of the A system (referred to as the own system) is mainly used, and the B system (another system) is illustrated. This will be explained as follows. The synchronization determination circuit 21a in the output panel (own system) includes AND circuits 31a and 31c, AND circuits 31b and 31d, one of the input terminals of which is an inverting terminal,
An AND circuit 31e having three input terminals, two of which are inverting terminals, and an OR circuit 32 are configured as follows.

  The AND circuit 31a inputs an abnormal signal 23a (this is also a signal 26A given to the B system output panel) when the A system commercial power supply 3a, which is the output of the synchronization detection circuit 16a, is abnormal to one input terminal. In addition, a normal signal when the B-system commercial power supply 3b is normal is input to the other inverting input terminal, and an abnormal signal indicating that the A-system only commercial power supply 3a is abnormal (bypass power supply abnormality) from its output terminal. 31as is output.

  An abnormality signal 23a (this is also a bypass abnormality signal (local system) 26A given to the B-system output panel) when the A-system commercial power supply 3a is abnormal, and a B-system commercial power supply 3b are connected to the input terminals of the AND circuit 31b. 25A is input, and an abnormal signal indicating that the commercial power supplies 3a and 3b are abnormal is output.

  An A system priority signal 26B is input to one inverting input terminal of the AND circuit 31c, a B system priority signal 25B is input to the other input terminal, and a B system priority signal is output when the A system priority signal is "0". To do.

  An abnormal signal when the commercial power supply 3b is abnormal, that is, a signal that is “1” when the commercial power supply 3b is normal is input to one of the inverting input terminals of the AND circuit 31e, and is input to one of the other inverting input terminals. Input a signal when the AC input power supply 2b is in operation, that is, a signal that is "1" when the AC input power supply 2b is normal, and input a signal to the remaining input terminals when the AC input power supply 2a is in operation, A signal 31es indicating that only the AC input power source 2a is in operation and the commercial power source 3a is normal is output.

  The AND circuit 31d receives the outputs of the AND circuits 31b and 31c, respectively, and outputs a signal 31ds indicating that the commercial power supply of both systems is abnormal.

  The logical sum circuit 32 inputs the outputs of the logical product circuits 31a, 31d, and 31e, and outputs a synchronization command 24a to the B-system synchronization detection circuit 16b.

  The synchronization determination circuit 21a described above has been described with the A system in FIG. 1 as its own system and B as another system, but the synchronization determination circuit 21b has the same configuration as the synchronization determination circuit 21a.

  FIG. 3 is a diagram for explaining a configuration example of the synchronization detection circuit 16a of FIG.

The synchronization detection circuit 16a inputs the voltage signal (the output signal of the voltage detector 15a of the A system) of the own system, for example, the A system, to the power failure detection circuit 41a and supplies the commercial power voltage to the synchronization determination circuit 21a. The first configuration for outputting the abnormal signal 23a, the voltage signal of the commercial power supply 3a described below, the output voltage signal 22b detected by the B-system voltage detector 15bb, and the B-system synchronization command 24b are input to the synchronization signal. 20a is output to the synchronous control circuit 17a.
The second configuration of the synchronization detection circuit 16a includes the output of the phase detection circuit 42a that detects the phase by inputting the voltage signal of the commercial power supply 3a, and the power failure detection circuit 41b that detects the power failure by inputting the output voltage signal 22b. The output of the phase detection circuit 42b for detecting the phase by inputting the output and the output voltage signal 22b and the free-running command 40 are input to the input terminal of the switching circuit 43, respectively, and the B-system synchronization command 24b is input to the switching circuit 43. Thus, the synchronization signal 20 is output.

  A synchronization detection circuit 16b is configured in the same manner as the synchronization detection circuit 16a described above.

  The operation of the first embodiment described above will be described with reference to the time chart of FIG.

[Healthy state]
The commercial power supplies 3a and 3b shown in FIG. 1 are the same. When the commercial power sources 3a and 3b are healthy, the commercial power sources 3a and 3b are in a synchronous operation. Therefore, when viewed from the load 11, the two uninterruptible power sources are synchronized.

[Power failure status]
When a power failure occurs in the commercial power supplies 3a and 3b as shown in FIG. 4 (a) from this healthy state, each uninterruptible power supply device is automatically installed in the conventional system as shown in FIGS. 4 (c) and 4 (e). As shown in FIG. 4 (g), the driving becomes asynchronous. On the other hand, in the present invention, an AND circuit 31d for detecting that the commercial power sources 3a and 3b are abnormal in both systems (A system and B system) and that the B system has priority is operated as shown in FIG. Thus, the B system is synchronized with the A system. Thereby, both uninterruptible power supplies 1a and 1b can be operated in synchronization with one self-running signal (in this case, the A system).

[Operation of AC input power source (in-house generator operation)]
Since the commercial power supply has failed, the power supply is switched to an AC input power supply such as a private generator, and both the A system and the B system when the commercial power supply is healthy enter the bypass synchronous operation state.

[Restoration after restoration of commercial power supply (A system: commercial power supply 3a is blackout, B system: AC input power supply 2b is operating)]
After the commercial power supply 3a is restored, the upper power supply performs sequential activation, so that the commercial power supply of each uninterruptible power supply is also sequentially switched from the AC input power supply to the commercial power supply. When switching from the AC input power source to the commercial power source in order from the A system, the A system is in a power outage and the B system is in the operating state. At this time, the logic circuit 31a that detects that only the A system shown in FIG. 2 has a bypass abnormality (the commercial power supply 3a is abnormal only in the A system) operates, and the A system becomes bB system synchronized. Thereby, both uninterruptible power supplies 1a and 1b can be operated in synchronization with one commercial power supply (in this case, B-system AC input power supply 2b).

[Restoration after restoration of commercial power supply (A system: commercial power supply, B system: AC input power supply operation)]
Further, when the A system is in the commercial power source and the B system is in the AC input power source, only the AC input power source shown in FIG. 2 is in operation and the B system bypass is normal (only the A system AC input power source 2a). AND circuit 31e that detects that the B-system commercial power supply 3b is in an abnormal state) operates and the B-system enters the A-other system synchronization state.

  Thereby, both the uninterruptible power supplies 1a and 1b can be operated in synchronization with one commercial power supply (in this case, the A-system commercial power supply 3a).

[Restoration after restoration of commercial power (A system: commercial power, B system; AC input power self-run)]
Further, an AND circuit 31a for detecting that the A system is a commercial power supply and the B system has a power failure, and that in the present invention, only the own system shown in FIG. In operation, the B-system synchronization command 24a is given to the synchronization detection circuit 16b. Thereby, both the uninterruptible power supplies 1a and 1b can be operated in synchronization with one commercial power supply (in this case, the A-system commercial power supply 3a).

(effect)
According to the first embodiment described above, even when the upper system of the uninterruptible power supply is in a different state, the two uninterruptible power supply devices always synchronize with each other with respect to the load. By making it possible to supply an uninterruptible power supply that is always synchronized, the reliability of load power supply can be improved.

[Embodiment 2]
The second embodiment of the present invention will be described below with reference to FIGS.

  FIG. 5 shows an uninterruptible power supply system of an individual bypass system. A new uninterruptible power supply 1c (having the same configuration as the uninterruptible power supply 1a) is added to the system A system and output to the output side of the uninterruptible power supply 1c. The one having the side contactor 9c is connected in parallel to the commercial power supply 3a, the AC input power supply 2a, and the output side contactor 9a, and a new uninterruptible power supply 1d (with the same configuration as the uninterruptible power supply 1b) is added to the B system. ) And an output-side contactor 9d on the output side of the uninterruptible power supply 1d are connected in parallel to the commercial power supply 3b, the AC input power supply 2b, and the output-side contactor 9b, and further as follows. .

  The output voltage detection signal 22a of the voltage detector 15aa of the A system is input to the synchronization detection circuits 16b and 16d of the B system, and the output voltage detection signal 22b of the voltage detector 15bb of the B system is synchronized with the synchronization of the A system. The signals are input to the detection circuits 16a and 16c, respectively.

  Moreover, the commercial voltage abnormality signal 23a output from the synchronization detection circuits 16a and 16c is input to the synchronization determination circuit 21a, and the B-system synchronization signal 24a output from the synchronization determination circuit 21a is synchronized with the synchronization detection circuits 16b and 16d. Has been entered. Further, the commercial voltage abnormality signal 23b output from the synchronization detection circuits 16b and 16d is input to the synchronization determination circuit 21b, and the B-system synchronization signal 24b output from the synchronization determination circuit 21b is synchronized with the synchronization detection circuits 16a and 16c. Has been entered. Other configurations are the same as those of the first embodiment, and the same parts as those in FIG.

  FIG. 6 is a diagram for explaining a configuration example of the synchronization determination circuit 21a of FIG. 5. Here, the synchronization determination circuit 21a of the A system (referred to as the own system) is mainly used, and the B system (referred to as the other system). ). The synchronization determination circuit 21a is different from that shown in FIG. 2 in that a logical product circuit 31f is newly provided, and commercial power from the synchronization detection circuits 16a and 16c included in the uninterruptible power supply devices 1a and 1c is provided at the input terminal of the logical product circuit 31f. The abnormal voltage signal 23a is input, the output terminal of the AND circuit 31f is input from each uninterruptible power supply 1 of the own system, and the output terminal of the AND circuit 31f is one input terminal of the AND circuit 31a. It is connected to the. That is, the logical product circuit 31f collects the A-system commercial power supply voltage abnormality. Similar to the synchronization determination circuit 21a described above, a synchronization determination circuit 21b is configured. The rest of the configuration is the same as that of FIG.

  In the second embodiment described above, the same effects as those in the first embodiment can be obtained.

[Embodiment 3]
Hereinafter, Embodiment 3 of the present invention will be described with reference to FIG.

FIG. 7 shows an uninterruptible power supply system of a collective bypass parallel redundant system. The difference from FIG. 5 is that the synchronous control circuits 17a, 17c, 17b and 17d are arranged in the uninterruptible power supplies 1a, 1c, 1b and 1d, respectively. Other inverter side contactors 8aa, 8cc, contactor 8a, output side contactor 9a, semiconductor switch 12a, commercial power source side contactor 13a, voltage detectors 15a, 15aa, synchronization detection circuit 16a, synchronization determination circuit 21a and inverter side contactors 8bb and 8dd, contactor 8b, output side contactor 9b, semiconductor switch 12b, commercial power source side contactor 13b, voltage detectors 15b and 15bb, synchronization detection circuit 16b, and synchronization determination circuit 21b each output It is configured to be placed on the board at once. In other configurations, the same parts as those of the second embodiment in FIG.

  The third embodiment described above can provide the same effects as those of the first embodiment.

  1a, 1b, 1c, 1d ... uninterruptible power supply, 2a, 2b ... AC input power supply, 3a, 3b ... commercial power supply, 4a, 4b ... AC input circuit breaker, 5a, 5b ... converter, 6a, 6b ... storage battery, 7a 7b: inverter, 8a, 8b, 8aa, 8cc ... inverter side contactor, 9a, 9b, 9c, 9d ... output contactor, 10 ... switching circuit, 11 ... load, 12a, 12b ... semiconductor switch, 13a, 13b ... Commercial power supply side contactor, 15a, 15b, 15aa, 15bb ... Voltage detector, 16a, 16b, 16c, 16d ... Synchronization detection circuit, 17a, 17b, 17c, 17d ... Synchronization control circuit, 18a, 18b ... Maintenance maintenance circuit breaker 21a. 21b ... Synchronization determination circuit, 24a, 24b ... Synchronization command, 25A ... Bypass abnormality signal (other system), 25B ... Priority signal (other system), 26A ... Bypass abnormality signal (own system), 26B ... Priority signal (own system) 31a, 31b, 31c, 31d, 31e, 31f ... AND circuit, 32 ... OR circuit, 40 ... free-running command, 41a, 41b ... blackout detection circuit, 42a, 42b ... phase detection circuit, 43 ... switching circuit

Claims (5)

A first uninterruptible power supply and a second uninterruptible power supply, and a switching circuit that supplies the output power of these uninterruptible power supply to a load and that can be switched when a failure occurs in the uninterruptible power supply. Prepared,
Each uninterruptible power supply converts DC power from each power storage means into AC power, an inverter that supplies the converted AC power to the load, a commercial power source, the inverter, and the load. A semiconductor switch that supplies and shuts off AC power from the commercial power source, a bypass circuit including a contactor connected in parallel to the semiconductor switch, and an output voltage of the inverter matches an output voltage reference. Voltage control means for generating an output voltage command for the inverter, a gate control circuit for controlling the gate of the switching element constituting the inverter based on the inverter output voltage command from the voltage control means, and detecting the voltage of the bypass circuit And a synchronization detection circuit for detecting a synchronization signal based on the detection voltage, and a synchronization detection circuit from the synchronization detection circuit. In the uninterruptible power supply system and a synchronous control circuit for providing a phase signal to the gate control circuit,
The first and second uninterruptible power supply devices always have synchronizing means for synchronizing with the load,
The synchronization means comprises a voltage detector and a synchronization determination circuit,
The voltage detector detects the output voltage of the own system of the uninterruptible power supply, and outputs the detected output voltage to the synchronization detection circuit of the other system,
The synchronization determination circuit includes an operation signal of the AC input power supply of the first and second uninterruptible power supply devices, an abnormality signal of the commercial power supply voltage of the local system, and an abnormal signal of the commercial power supply voltage of the other system, Input other system priority command from the host system,
Either when the local commercial power supply is abnormal, when the local or other commercial power supply is abnormal, or when only the local AC input power supply is operating and the other commercial power supply is normal outputs other system synchronization command before Symbol another system synchronization detection circuit when a logical condition is satisfied, the bypass abnormality to the other-system synchronization determination circuit when the commercial power supply of the self-system is abnormal uninterruptible power supply system outputs a signal, characterized that you output as to the synchronization determination circuit of the other system the contents of the self-system priority signal as another system priority signal. The first uninterruptible power supply group and the second uninterruptible power supply group, and the output power of these uninterruptible power supply groups are supplied to the load, and can be switched when a failure occurs in the uninterruptible power supply group. A switching circuit for
Each of the uninterruptible power supply groups is to connect a plurality of uninterruptible power supply apparatuses in parallel, converts DC power from each power storage means into AC power, and supplies the converted AC power to the load A bypass circuit including an inverter that performs power supply, a semiconductor switch that supplies and shuts off AC power from the commercial power supply between the inverter and the load, and a contactor connected in parallel to the semiconductor switch A voltage control unit that generates an output voltage command of the inverter so that an output voltage of the inverter matches an output voltage reference, and a switching element that configures the inverter based on the inverter output voltage command from the voltage control unit. A gate control circuit that controls the gate and a synchronous detection circuit that detects a voltage of the bypass circuit and detects a synchronization signal based on the detected voltage. When, in the uninterruptible power supply system and a synchronous control circuit for providing a phase signal obtained based on the synchronization signal from the synchronization detection circuit to the gate control circuit,
The first and second uninterruptible power supply groups always have synchronization means for synchronizing with the load,
The synchronization means comprises a voltage detector and a synchronization determination circuit,
The voltage detector detects the output voltage of the own system in the uninterruptible power supply group, and outputs the detected output voltage to the synchronization detection circuit of the other system,
The synchronization determination circuit includes an operation signal of the AC input power supply of the first and second uninterruptible power supply apparatuses, an abnormality signal of the commercial power supply voltage of the own system, and an abnormality signal of the commercial power supply voltage of the other system , Input other system priority command from the host system,
Either when the local commercial power supply is abnormal, when the local or other commercial power supply is abnormal, or when only the local AC input power supply is operating and the other commercial power supply is normal outputs other system synchronization command before Symbol another system synchronization detection circuit when a logical condition is satisfied, the bypass abnormality to the other-system synchronization determination circuit when the commercial power supply of the self-system is abnormal uninterruptible power supply system outputs a signal, characterized that you output as to the synchronization determination circuit of the other system the contents of the self-system priority signal as another system priority signal. The first uninterruptible power supply group and the second uninterruptible power supply group, and the output power of these uninterruptible power supply groups are supplied to the load, and can be switched when a failure occurs in the uninterruptible power supply group. A switching circuit for
Each of the uninterruptible power supply groups is to connect a plurality of uninterruptible power supply apparatuses in parallel, converts DC power from each power storage means into AC power, and supplies the converted AC power to the load A bypass circuit including an inverter that performs power supply, a semiconductor switch that supplies and shuts off AC power from the commercial power supply between the inverter and the load, and a contactor connected in parallel to the semiconductor switch A voltage control unit that generates an output voltage command of the inverter so that an output voltage of the inverter matches an output voltage reference, and a switching element that configures the inverter based on the inverter output voltage command from the voltage control unit. A gate control circuit for controlling the gate;
A synchronization control circuit that provides the gate control circuit with a phase signal determined based on the synchronization signal;
A synchronization detection circuit that is separate from each of the uninterruptible power supply groups, detects a voltage of the bypass circuit, detects a synchronization signal based on the detection voltage, and applies the detected synchronization signal to the synchronization control circuit; In an uninterruptible power system with an output panel including
The first and second uninterruptible power supply groups always have synchronization means for synchronizing with the load,
The synchronization means comprises a voltage detector and a synchronization determination circuit,
The voltage detector detects the output voltage of the own system in the uninterruptible power supply group, and outputs the detected output voltage to the synchronization detection circuit of the other system,
The synchronization determination circuit includes an operation signal of the AC input power supply of the first and second uninterruptible power supply apparatuses, an abnormality signal of the commercial power supply voltage of the own system, and an abnormality signal of the commercial power supply voltage of the other system , Input other system priority command from the host system,
Either when the local commercial power supply is abnormal, when the local or other commercial power supply is abnormal, or when only the local AC input power supply is operating and the other commercial power supply is normal outputs other system synchronization command before Symbol another system synchronization detection circuit when a logical condition is satisfied, the bypass abnormality to the other-system synchronization determination circuit when the commercial power supply of the self-system is abnormal uninterruptible power supply system outputs a signal, characterized that you output as to the synchronization determination circuit of the other system the contents of the self-system priority signal as another system priority signal. The first uninterruptible power supply group and the second uninterruptible power supply group, and the output power of these uninterruptible power supply groups are supplied to the load, and can be switched when a failure occurs in the uninterruptible power supply group. A switching circuit for
Each of the uninterruptible power supply groups is to connect a plurality of uninterruptible power supply apparatuses in parallel, converts DC power from each power storage means into AC power, and supplies the converted AC power to the load A bypass circuit including an inverter that performs power supply, a semiconductor switch that supplies and shuts off AC power from the commercial power supply between the inverter and the load, and a contactor connected in parallel to the semiconductor switch A voltage control unit that generates an output voltage command of the inverter so that an output voltage of the inverter matches an output voltage reference, and a switching element that configures the inverter based on the inverter output voltage command from the voltage control unit. A gate control circuit that controls the gate and a synchronous detection circuit that detects a voltage of the bypass circuit and detects a synchronization signal based on the detected voltage. When, in the uninterruptible power supply system and a synchronous control circuit for providing a phase signal obtained based on the synchronization signal from the synchronization detection circuit to the gate control circuit,
The first and second uninterruptible power supply groups always have synchronization means for synchronizing with the load,
The synchronization means comprises a voltage detector and a synchronization determination circuit,
The voltage detector detects the output voltage of the own system of the uninterruptible power supply, and outputs the detected output voltage to the synchronization detection circuit of the other system,
The synchronization determination circuit includes an operation signal of the AC input power supply of the first and second uninterruptible power supply devices, an abnormality signal of commercial power supply voltages of all the uninterruptible power supply devices of the own system, and a commercial signal of the other system Input the power supply voltage error signal and the other system priority command from the host system.
Either when the local commercial power supply is abnormal, when the local or other commercial power supply is abnormal, or when only the local AC input power supply is operating and the other commercial power supply is normal outputs other system synchronization command before Symbol another system synchronization detection circuit when a logical condition is satisfied, the bypass abnormality to the other-system synchronization determination circuit when the commercial power supply of the self-system is abnormal uninterruptible power supply system outputs a signal, characterized that you output as to the synchronization determination circuit of the other system the contents of the self-system priority signal as another system priority signal. The first uninterruptible power supply group and the second uninterruptible power supply group, and the output power of these uninterruptible power supply groups are supplied to the load, and can be switched when a failure occurs in the uninterruptible power supply group. A switching circuit for
Each of the uninterruptible power supply groups is to connect a plurality of uninterruptible power supply apparatuses in parallel, converts DC power from each power storage means into AC power, and supplies the converted AC power to the load A bypass circuit including an inverter that performs power supply, a semiconductor switch that supplies and shuts off AC power from the commercial power supply between the inverter and the load, and a contactor connected in parallel to the semiconductor switch A voltage control unit that generates an output voltage command of the inverter so that an output voltage of the inverter matches an output voltage reference, and a switching element that configures the inverter based on the inverter output voltage command from the voltage control unit. A gate control circuit for controlling the gate;
A synchronization control circuit that provides the gate control circuit with a phase signal determined based on the synchronization signal;
A synchronization detection circuit that is separate from each of the uninterruptible power supply groups, detects a voltage of the bypass circuit, detects a synchronization signal based on the detection voltage, and applies the detected synchronization signal to the synchronization control circuit; In an uninterruptible power system with an output panel including
The first and second uninterruptible power supply groups always have synchronization means for synchronizing with the load,
The synchronization means comprises a voltage detector and a synchronization determination circuit,
The voltage detector detects the output voltage of the own system of the uninterruptible power supply, and outputs the detected output voltage to the synchronization detection circuit of the other system,
The synchronization determination circuit includes an operation signal of the AC input power supply of the first and second uninterruptible power supply devices, an abnormality signal of commercial power supply voltages of all the uninterruptible power supply devices of the own system, and a commercial signal of the other system Input the power supply voltage error signal and the other system priority command from the host system.
Either when the local commercial power supply is abnormal, when the local or other commercial power supply is abnormal, or when only the local AC input power supply is operating and the other commercial power supply is normal outputs other system synchronization command before Symbol another system synchronization detection circuit when a logical condition is satisfied, the bypass abnormality to the other-system synchronization determination circuit when the commercial power supply of the self-system is abnormal uninterruptible power supply system outputs a signal, characterized that you output as to the synchronization determination circuit of the other system the contents of the self-system priority signal as another system priority signal.

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