JP2008172864A - Uninterruptible power supply and its extension method - Google Patents

Abstract

Disclosed is an uninterruptible power supply apparatus that can increase the capacity of the entire system by providing not only a module part but also a switching function part by utilizing a parallel system in operation, and a method for adding the same.
A switching switch for switchingly connecting any one of a UPS module having an AC / DC converter, a secondary battery, and a DC / AC converter and an AC power supply for bypass to a load side, When the capacity of the entire system is increased, the power switching device having the same configuration as the power switching device 13 is provided. After adding 23 to increase the capacity of the common part, the UPS module 21 is added and connected in parallel with the existing UPS module 11 to increase the capacity of the entire system.
[Selection] Figure 1

Description

  The present invention relates to an uninterruptible power supply facility that supplies a stable power supply to an important load and a method for adding the same.

  Generally, uninterruptible power supply equipment that stably supplies power of constant voltage / constant frequency is used for power supply equipment for important loads such as computer equipment. As one of the uninterruptible power supply facilities, a converter that converts an alternating current supplied from a commercial power source into a direct current, a secondary battery that is charged by the direct current converted by the converter, and a direct current that is output from the converter and the secondary battery There is a parallel system in which a plurality of uninterruptible power supplies (hereinafter referred to as UPS) including an inverter for converting AC to AC are prepared as modules and these are connected in parallel to supply power to the load side.

  Such an uninterruptible power supply system using a parallel system includes a plurality of UPS modules and a parallel switching device that switches and connects the plurality of UPS modules according to the load capacity. As described above, the parallel switching device switches the parallel connection state of a plurality of UPS modules in accordance with the load capacity, and the power supply path to the load, such as the state of occurrence of the UPS modules connected in parallel, is connected to the UPS module side. Therefore, it has a switching function for switching to the bypass power supply path side by the commercial power supply without interruption. This switching function is composed of a switching switch and a semiconductor switch (referred to as a thyristor switch) with no operation delay.

  In such an uninterruptible power supply facility, a UPS module connected in parallel has a standard configuration with redundancy added to the number corresponding to the load capacity. Even if one UPS module fails and is disconnected, UPS power supply can be continued with respect to the load because the redundant UPS module bears the load instead. Even when two or more UPSs fail at the same time, if the sum of the remaining UPS capacities is larger than the load capacity, the UPS power feeding is continued. However, when the sum of the remaining UPS capacities becomes smaller than the load capacity, the switching function described above switches to the bypass power supply path by the commercial power source without interruption, and power is supplied from the commercial power source.

Proposals related to such parallel operation of UPS have been made conventionally (see, for example, Patent Document 1).
Japanese Patent No. 321735

  Conventionally, in such an uninterruptible power supply facility, when the system capacity of an operating parallel system is increased, UPS modules corresponding to the increased capacity are added in parallel. Here, the parallel switching device having the switching function is common to the UPS modules connected in parallel, and the switching function requires the ability to switch the total output current of the UPS modules connected in parallel without interruption. It becomes. For this reason, if an increase in capacity is expected in the future, it is necessary to provide redundancy for the capacity of the added UPS module at the time of system construction. If there was no redundancy, another system had to be constructed.

  In principle, the two systems are independent power supply systems. Therefore, when switching the system system during operation, a cross current occurs between the systems, and the possibility of affecting the power supply cannot be ignored.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an uninterruptible power supply apparatus capable of increasing the capacity of the entire system by diverting not only a module part but also a common switching function part by diverting an operating parallel system, and a method for adding the same Is to provide.

  An uninterruptible power supply according to the present invention includes an AC / DC converter, a secondary battery, a UPS module having a DC / AC converter, a first input terminal connected to the output side of the UPS module, and an AC power supply for bypassing. A switching switch having a second input terminal to be connected and an output terminal connected to the load side, and switching and connecting one of the first and second input terminals to the output terminal side, and the switching switch A power switching device having a semiconductor switch connected between the second input terminal and the output terminal, an AC / DC converter, a secondary battery, a DC / AC converter, and connected in parallel to the UPS module. An extension UPS module, an extension switching switch and an extension semiconductor switch having the same function as the power switching device, and the first input terminal, the second input terminal, and the output terminal of the extension switching switch are: An additional power source switching device connected to the corresponding one of the first input terminal, the second input terminal, and the output terminal of the power source switching device and having a switching capacity larger than the output capacity of the additional UPS module. It is characterized by that.

  The uninterruptible power supply installation method according to the present invention includes an AC / DC converter, a secondary battery, a UPS module having a DC / AC converter, and a first input terminal connected to the output side of the UPS module, A switching switch having a second input terminal connected to the bypass AC power source and an output terminal connected to the load side, and switching and connecting one of the first and second input terminals to the output terminal side; And an additional switching switch and an additional semiconductor having the same function as that of the power switching device for existing equipment comprising a power switching device having a semiconductor switch connected between the second input terminal and the output terminal of the switching switch. A first input terminal, a second input terminal, and an output terminal of the additional switching switch provided in the additional power switching apparatus having a switch are connected to the first input of the switching switch in the power switching apparatus. After connecting to corresponding terminals, second input terminals, and output terminals, an additional UPS module having an AC / DC converter, a secondary battery, and a DC / AC converter is connected in parallel to the UPS module. It is characterized by.

  According to the present invention, it is possible to re-add the system more flexibly and easily than before by making use of the existing one by making it possible to newly add a redundant part to the common switching function part that was difficult to increase the capacity during operation. Construction is possible.

  Hereinafter, an embodiment of an uninterruptible power supply facility according to the present invention will be described in detail with reference to the drawings.

  First, the circuit configuration of an existing general uninterruptible power supply facility will be described with reference to FIG. A UPS module 11 is an AC / DC converter (hereinafter referred to as a converter) 1, a secondary battery (hereinafter referred to as a battery) 6, a DC / AC converter (hereinafter referred to as an inverter), and an output transformer 12. Have A circuit breaker 31 is provided on the input side of the converter 1, and an alternating current supplied from a commercial power source (not shown) is input via the circuit breaker 31 and converted to a direct current. The battery 6 is connected to the output side of the converter 1 and the input side of the inverter 2 via the circuit breaker 32, and is charged by the direct current converted by the converter 1 and also to the inverter 2 at the time of discharging. Supply. The inverter 2 receives the direct current output from the converter 1 and the direct current output discharged from the battery 6 and converts this into alternating current. The converted alternating current is output from the UPS module 11 via the output transformer 12. A plurality of UPS modules 11 (No. 1 to No. 3 in the illustrated example) are prepared and combined according to the load capacity.

  Reference numeral 13 denotes a power supply switching device that functions as a parallel control system. The power supply switching device 13 is provided in common for the plurality of UPS modules 11 and switches and connects the plurality of UPS modules 11 according to the load capacity. Further, the power supply switching device 13 is used for switching without switching to the bypass power supply path connected to the commercial power supply 14 instead of the UPS modules 11 connected in parallel when the UPS module 11 fails. It has a function. This switching function includes a switching switch 4 described later and a thyristor switch 5 having no operation delay.

  That is, the power supply switching device 13 is connected to the output side of each UPS module 11 and has a circuit breaker 33 for connecting the UPS modules 11 in parallel. ing. For example, a double throw electromagnetic contactor is used for the switching switch 4. The first input terminal 41 is connected to the common connection end of each circuit breaker 33 and is connected to the output side of each UPS module 11. The second input terminal 42 is connected to the bypass AC power supply 14 such as a commercial power supply via the circuit breaker 34. Further, the output terminal 43 is connected to a load side (not shown) via the circuit breaker 35. The switch 4 selectively switches and connects either the first input terminal 41 or the second input terminal 42 to the output terminal 43 side.

  The thyristor switch 5 is connected between the second input terminal 42 and the output terminal 43 of the switching switch 4. The thyristor switch 5 is controlled to be turned on when the switching switch 4 performs a switching operation, thereby realizing uninterrupted switching. To do.

  Reference numeral 36 denotes a maintenance bypass power supply circuit breaker, which is on-controlled when the entire uninterruptible power supply facility is maintained.

  The UPS modules 11 from No. 1 to No. 3 and the power supply switching device 13 common to these modules are arranged in a row as shown in FIG.

  In such an existing uninterruptible power supply facility, the capacity of the uninterruptible power supply itself may become insufficient as the load capacity increases. In such a case, the capacity of the existing UPS modules 11 connected in parallel is insufficient, and therefore, for example, one USP module equivalent to the existing UPS module 11 is added. At this time, it is assumed that the switching capacity of the existing power supply switching device 13 is only the capacity of the three existing modules. For this reason, simply adding one set equivalent to the UPS module 11 cannot function as an uninterruptible power supply facility.

  Therefore, as shown in FIGS. 2 and 3, an additional power supply switching device 23 is prepared, and connection points are provided at corresponding portions of the existing power supply switching device 13, and these corresponding portions are connected to each other. did. In other words, the extension power supply switching device 23 has an extension switching switch 40 and an extension thyristor switch 50 having the same functions as those of the existing power supply switching device 13. Then, the first input terminal 401, the second input terminal 402, and the output terminal 403 of the extension switching switch 40 are provided with connection points 71, 81, 91 through connection lines, respectively. On the other hand, the first input terminal 41, the second input terminal 42, and the output terminal 43 of the existing power supply switching device 4 are also provided with connection points 70, 80, and 90 via connection lines. Each is configured to be connected to each other.

  On the other hand, as shown in FIG. 1, No. 1 2, no. No. 3 connected in parallel to the 3UPS module 11. As in the existing UPS module 11, the converter 1, the battery 6, the inverter 2, and the like are provided.

  Here, it is assumed that the additional power supply switching device 23 has a switching capacity larger than the output capacity of the additional UPS module 21.

  In FIG. 1, the control circuit 10 controls the entire uninterruptible power supply. Specifically, the UPS modules 11 and 21 are switched in parallel operation, the uninterruptible switching using the thyristor switches 5 and 50, and the like. To control.

  In the above configuration, when the USP module 21 is added to the uninterruptible power supply facility shown in FIG. 5, first, the extension power supply switching device 23 is connected to the existing power supply switching device 13 shown in FIG. Corresponding portions are connected as shown in FIG. That is, in FIG. 1, reference numeral 7 denotes a connection for connecting between the corresponding first terminals 41 and 401 shown in FIGS. 2 and 3 of the switching switches 4 and 40 provided in the both power supply switching devices 13 and 23. The connection part of the points 70 and 71 is shown. Reference numeral 8 denotes a connection portion of connection points 80 and 81 connecting the second terminals 42 and 402, and reference numeral 9 denotes a connection point 90 and 91 connecting the output terminals 43 and 403. The connection part of is shown.

  As a result, the first input terminal 401, the second input terminal 402, and the output terminal 403 of the extension switching switch 40 are the same as the first input terminal 41, the second input terminal 42 of the existing switching switch 4, And it becomes a parallel structure respectively connected to the thing corresponding to the output terminal 43, and increases the switching capacity as the power supply switching devices 13 and 23 whole. Thereafter, the expansion UPS module 21 is connected in parallel to the existing UPS module 11.

  That is, when increasing the system capacity of the uninterruptible power supply facility, first, the additional power source switching device 23 is added to the existing power source switching device 13 to increase the capacity of the common part (power source switching device part). This expansion work may be performed by mutually connecting the corresponding connection points 70 and 71, the 8081, and the 90 and 91 of the both power supply switching devices 13 and 23. After the capacity of the common part is increased in this way, the circuit breaker 36 is turned on to switch to maintenance bypass power supply, and then the additional UPS module 21 is added and connected in parallel to the existing UPS module 11 via the circuit breaker 33. .

  These arrangement configurations are as shown in FIG. 4, and an additional UPS module 21 and an additional power supply switching device 23 are arranged outside them so as to sandwich the three existing UPS modules 11 and the existing power supply switching device 13 configured in a row. Are arranged in a row.

  As described above, when the power supply capacity is increased with respect to the existing uninterruptible power supply equipment, even if the existing common part (existing power supply switching device 13 portion) has only the capacity of the current UPS module 11 and has no redundancy. Since the capacity of the common part is increased by adding an equivalent power supply switching device 23, the UPS module 21 can be added to increase the power supply capacity as an uninterruptible power supply. For this reason, it is not necessary to consider future increase in power supply at the time of system construction, and it is not necessary to provide unnecessary redundancy. Further, the addition of the power supply switching device 23 may be easily performed by simply connecting corresponding ones of the connection points provided in advance.

It is a circuit block diagram which shows one Embodiment of the uninterruptible power supply equipment by this invention. It is a circuit block diagram which shows the structural example of the existing power supply switching apparatus used for one embodiment same as the above. It is a circuit block diagram which shows the structural example of the additional power supply switching device used for one embodiment same as the above. It is an external appearance perspective view which compares and shows before extension of uninterruptible power supply equipment used as the object of the present invention. It is a figure which shows a general uninterruptible power supply equipment circuit structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC / DC converter 2 DC / AC converter 31-37 Circuit breaker 4, 40 Switching switch 41,401 1st input terminal 42,402 2nd input terminal 43,403 Output terminal 5,50 Semiconductor switch ( Thyristor switch)
6 Secondary battery 7, 8, 9 Corresponding connection part 11 UPS module 13 Power supply switching device 14 Bypass AC power supply 21 Additional UPS module 23 Additional power supply switching device

Claims (2)

An UPS module having an AC / DC converter, a secondary battery, and a DC / AC converter;
The first input terminal connected to the output side of the UPS module, the second input terminal connected to the bypass AC power source, and the output terminal connected to the load side. These first and second input terminals A switching switch for switching and connecting any of the above to the output terminal side, and a power switching device having a semiconductor switch connected between the second input terminal and the output terminal of the switching switch,
An additional UPS module having an AC / DC converter, a secondary battery, a DC / AC converter, and connected in parallel to the UPS module;
An extension switching switch and an extension semiconductor switch having the same function as the power switching device are provided, and the first input terminal, the second input terminal, and the output terminal of the extension switching switch are the first of the power switching device. An additional power supply switching device connected to a corresponding one of the input terminal, the second input terminal, and the output terminal of the power supply, and having a switching capacity larger than the output capacity of the additional UPS module;
An uninterruptible power supply facility characterized by comprising A UPS module having an AC / DC converter, a secondary battery, a DC / AC converter, a first input terminal connected to the output side of the UPS module, a second input terminal connected to an AC power supply for bypass, and A switching switch having an output terminal connected to the load side, and switching and connecting one of the first and second input terminals to the output terminal side; and the second input terminal and the output of the switching switch For existing equipment consisting of a power switching device with a semiconductor switch connected between terminals,
A first input terminal, a second input terminal, and an output terminal of the additional switching switch provided in an additional switching switch having the same function as the power switching device and an additional power switching device having an additional semiconductor switch; An AC / DC converter, a secondary battery, and a DC / AC converter are connected to corresponding ones of the first input terminal, the second input terminal, and the output terminal of the switching switch in the power supply switching device. A method for adding uninterruptible power supply equipment, characterized in that an additional UPS module is connected in parallel to the UPS module.

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