JP2017073854A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of supplying general loads only with the power of excessive capacity of an UPS, while limiting the general loads upon occurrence of system power failure.SOLUTION: An UPS 11 is provided with a bidirectional converter 1 at the input, and the bidirectional converter 1 is connected with a battery 2. An operation unit 3 is installed on the UPS (uninterruptible power supply) 11 side. Upon detection of system power failure, the operation unit 3 compares the residual capacity of the battery 2 with the capacity required for the UPS load C, and obtains the residual capacity of the UPS 11 from the difference of the residual capacity of the battery 2 and the capacity of the UPS load C. A load section unit 6 is provided on the supervisory control unit 12 side. When the residual capacity of the UPS 11 exceeds a preset value, the load section unit 6 selects a general load B preset by the user.SELECTED DRAWING: Figure 1

Description

  Embodiment of this invention calculates | requires the surplus capacity of an uninterruptible power supply, and is the electric power supply which can supply the electric power for surplus capacity with respect to the general load which is loads other than the important load which a power failure is not permitted at the time of a system power failure About the system.

  An emergency generator is installed in a high-voltage or extra-high-voltage power receiving facility in preparation for a system power failure. Since the emergency generator takes several seconds to 40 seconds to start up, if a system power failure occurs at the power receiving facility, the load on the premises must wait in the power failure state until power is supplied by the emergency generator. Forced. However, because the power receiving equipment also has an important load that does not allow power outages, such as a server, a dedicated uninterruptible power supply (hereinafter referred to as UPS) is installed for such an important load. .

  The UPS incorporates a chargeable / dischargeable battery, and this battery receives power from the system during normal system power supply operation. When a system power failure occurs and power supply from the outside is stopped, the battery discharges power of the same standard for a predetermined time to an important load (hereinafter referred to as a UPS load) where the power failure is not allowed.

  Such a UPS is meaningless as a UPS if it becomes impossible to continue a stable power supply to the UPS load when a power failure or instantaneous voltage drop occurs in the power system. Therefore, the UPS often has a surplus capacity with respect to the capacity of the UPS load, and a parallel redundant system, a common spare system, and the like are mainly used.

JP 2010-178425 A

  With the increasing importance of information infrastructure, UPS has been actively introduced. Also, a UPS is often installed in anticipation of a future increase in the UPS load, and the surplus capacity of the UPS tends to be designed with a considerable margin. Therefore, the UPS surplus capacity is large at the initial stage of introducing the UPS, and the UPS surplus capacity decreases as the UPS load increases. Therefore, effective utilization of the surplus capacity of the UPS has been attempted, and development of a technology that can flexibly cope with the surplus capacity has been awaited.

  The present embodiment has been proposed to solve the above-described problem. The purpose of this embodiment is to supply only the power for the surplus capacity of the UPS to the general load while limiting the general load when a system power failure occurs. An object of the present invention is to provide a power supply system.

In order to achieve the above object, a power supply system according to an embodiment of the present invention includes the following components (1) to (6).
(1) An uninterruptible power supply that supplies power to critical loads that do not allow power outages.
(2) An arithmetic unit that obtains a surplus capacity of the uninterruptible power supply by subtracting a capacity required for the important load from a remaining capacity of the uninterruptible power supply.
(3) A load selection unit that selects a load that supplies power for the surplus capacity from a general load that is a load other than the important load in accordance with the surplus capacity.
(4) An open / close command unit that outputs a closing command to the general load selected by the load selection unit and outputs a shut-off command to the general load other than that selected by the load selection unit.
(5) A communication unit that transmits a power supply command for supplying power to the general load selected by the load selection unit to the uninterruptible power supply.
(6) A bidirectional converter provided at an input unit of the uninterruptible power supply.

The block diagram of 1st Embodiment. The block diagram of 1st Embodiment. A flow chart at the time of system power failure occurrence. The block diagram at the time of normal system | strain operation | movement in 1st Embodiment. FIG. 3 is a block diagram when the UPS is activated in the first embodiment. FIG. 3 is a block diagram immediately after power recovery after UPS activation in the first embodiment. The block diagram at the time of power recovery after UPS starting in 1st Embodiment. The block diagram at the time of switching from UPS to an emergency generator in 1st Embodiment. The block diagram when the emergency generator starts in 1st Embodiment.

(1) First embodiment (configuration)
Hereinafter, the configuration of the first exemplary embodiment of the present invention will be specifically described with reference to the drawings. 1 and 2 are block diagrams of the first embodiment. As shown in these drawings, the power supply system 10 according to the first embodiment is provided with a UPS 11 and a monitoring control unit 12.

  The UPS 11 is equipment for supplying power to the UPS load C, which is an important load that does not allow a power failure, for a predetermined time when a system power failure occurs. In the UPS 11, a bidirectional converter 1 is provided at an input unit, and a chargeable / dischargeable battery 2 is connected to the bidirectional converter 1. The UPS 11 is provided with a calculation unit 3 and a communication unit 4, and the monitoring control unit 12 is provided with a communication unit 5, a load selection unit 6, and an opening / closing command unit 7. Each of these components will be described later with reference to FIG.

  The UPS 11 and the UPS load C are installed in a power receiving facility. General loads A and B and an emergency generator 14 are also arranged in the power receiving facility. The emergency generator 14 is a facility for supplying power to the general load B and the UPS load C when a system power failure occurs. A system power supply 13 is connected to the general loads A and B and the UPS load C. During normal system operation, the general loads A and B and the UPS load C are supplied with power from the system power supply 13. The general load B is a safety system load such as a disaster prevention load, the general load A is a load such as lighting, and these loads are loads other than the UPS load C. Here, although two general loads are shown in FIGS. 1 and 2, the present invention is not limited to this.

  By the way, the emergency generator 14 requires at least several seconds to start. Therefore, the battery 2 of the UPS 11 is discharged until the emergency power generator 14 is started after the system power failure occurs, and power is supplied to the UPS load C through the bidirectional converter 1. When the emergency generator 14 is activated, the power supply to the UPS load C due to the battery 2 discharge of the UPS 11 is stopped, and the emergency generator 14 supplies power to the UPS load C.

(Each component of the UPS 11 and the monitoring controller 12)
In the power supply system 10 according to this embodiment, the UPS 11 is activated after the occurrence of a system power failure and supplies power to the UPS load C. In addition to that, the surplus capacity of the UPS 11 is also supplied to the general load B. To do. However, the power supply to the general load B is in the range of the surplus capacity of the UPS 11, and the general load B that is the power supply target is also limited to a preselected one.

  Hereinafter, the operation of each component of the UPS 11 and the monitoring controller 12 when a system power failure occurs will be described with reference to FIG. The calculation unit 3 takes in the load capacity of the UPS load C ([1] in FIG. 2) and detects this when a system power failure occurs. When the power failure is detected, the arithmetic unit 3 compares the remaining capacity of the battery 2 at that time with the capacity required for the UPS load C ([2] in FIG. 2), and calculates the surplus capacity of the UPS 11 from the difference between the two. Ask. The communication unit 4 transmits the surplus capacity of the UPS 11 that is the calculation result of the calculation unit 3 to the communication unit 5 on the monitoring control unit 12 side ([3] in FIG. 2).

  The communication unit 5 sends the surplus capacity of the UPS 11 received from the communication unit 4 to the load selection unit 6. When the surplus capacity of the UPS 11 exceeds a preset setting value, the load selection unit 6 selects a general load B set in advance by the user. As described above, the general load B is a safety-related general load such as a disaster prevention load. If the surplus capacity of the UPS 11 is equal to or less than the set value, the load selection unit 6 supplies power only to the UPS load C without selecting the general load B as a power supply target.

  The opening / closing command unit 7 performs selective opening / closing of the general loads A and B. When a system power failure occurs, the open / close command unit 7 outputs a closing command to the general load B selected by the load selection unit 6 and outputs a shut-off command to the general load A not selected by the load selection unit 6 ( [4] in FIG. In addition, when the system is restored, the open / close command unit 7 outputs an input command to the general load A that is not selected by the load selection unit 6.

  The load selection unit 6 sends the selection result to the communication unit 5. The communication unit 5 transmits a power supply command for supplying power to the general load B selected by the load selection unit 6 to the communication unit 4 on the UPS 11 side ([5] in FIG. 2). When receiving a power supply command from the communication unit 5, the communication unit 4 sends a discharge command to the bidirectional converter 1 ([6] in FIG. 2). When the UPS 11 receives the discharge command from the communication unit 4, the UPS 11 supplies power to the general load B and the UPS load C selected by the load selection unit 6 through the bidirectional converter 1 according to the discharge command.

  The flowchart of FIG. 3 shows the flow of processing when a power failure occurs in the power supply system 10. This flowchart includes modes of starting the UPS 11 and starting the emergency generator 14. First, when a system power failure occurs (ST01), it is confirmed whether or not the system has been restored before the power supply preparation of the UPS 11 is completed (ST02). If the system power failure is a momentary power failure and the system is instantaneously restored, the system immediately restored power before the UPS 11 was started (Y in ST02). The UPS 11 and the emergency generator 14 The power supply from the system power supply 13 is resumed without starting up (ST08).

(During normal system operation)
The resumption of power supply from the system power supply 13 is nothing but returning to the normal system operation state. During normal system operation, the general loads A and B and the UPS load C are supplied with power from the system power supply 13 as shown in FIG. Further, the UPS 11 is charging the battery 2 by the bidirectional converter 1 receiving power from the system power supply 13.

  After the UPS 11 is ready for power supply, if the system has not recovered power (N in ST02), the UPS 11 is activated to supply power to the UPS load C (ST03). The activated UPS 11 also supplies power to the general load B.

(When UPS starts)
FIG. 5 shows the flow of power when a system power failure occurs from the normal system operation when the UPS 11 is activated. When a system power failure occurs from the state shown in FIG. 4, the battery 2 is discharged in the UPS 11 and power is supplied to the UPS load C and the general load B through the bidirectional converter 1 as shown in FIG. 5. At this time, as shown in FIG. 2, in the UPS 11, the open / close command unit 7 outputs a closing command to the general load B and outputs a cutoff command to the general load A.

  After the startup of the UPS 11 as described above, before the power supply preparation of the emergency generator 14 is completed, it is confirmed whether or not the system has been restored (ST04 in FIG. 3). If the system recovers before the power supply preparation for the emergency generator 14 is completed (Y in ST04), the power supply from the system power supply 13 is resumed without starting the emergency generator 14. (ST08, state of FIG. 4).

(When power is restored after UPS is started)
When the system is restored after the UPS 11 is activated, if the UPS 11 supplies power to the general load B, the circuit breaker on the system power supply 13 side cannot be turned on. Therefore, when the system returns, as shown in FIG. 6, first, power supply from the UPS 11 to the general load B is stopped, and the UPS 11 continues power supply only to the UPS load C.

  Subsequently, as shown in FIG. 7, a circuit breaker on the system power supply 13 side is turned on to close the system side. At this time, the UPS 11 controls the output to the UPS load C in accordance with the input from the system power supply 13 to match the voltage, frequency and phase. When the input and output voltages, frequencies, and phases are matched in the UPS 11, charging from the bidirectional converter 1 to the battery 2 and power feeding from the system power supply 13 to the UPS load C are resumed. That is, the normal system operation state shown in FIG. 4 is restored.

(When the emergency generator starts)
When the power supply for the emergency generator 14 is ready, if the system is not restored (N in ST04), the emergency generator 14 is activated, and the UPS load C and the general load B are started from the emergency generator 14. Electric power is supplied to (ST05). At this time, the power supply to the UPS load C and the general load B by the UPS 11 is stopped, but when both are switched, synchronization is performed as follows.

  As shown in FIG. 8, when the emergency generator 14 is activated, in the UPS 11, the bidirectional converter 1 inputs the voltage signal from the emergency generator 14, controls the output in accordance with this, and inputs and For output, match both voltage, frequency and phase. At this point, the UPS 11 is still supplying power to the UPS load C and the general load B.

  When the voltage, frequency, and phase of the input from the emergency generator 14 and the output from the bidirectional converter 1 are the same, as shown in FIG. 9, the circuit breaker on the emergency generator 14 side is synchronously turned on. To do. Thus, the emergency generator 14 continuously supplies power to the UPS load C and the general load B without stopping the power supply to the UPS load C and the general load B. Further, when the emergency generator 14 is activated, the UPS 11 charges the battery 2 by receiving power from the emergency generator 14 through the bidirectional converter 1.

  After starting the emergency generator 14 as described above, the power recovery of the system is confirmed again (ST06 in FIG. 3). If power recovery of the system is not detected (N in ST06), the power supply by the emergency generator 14 is continued. When power recovery from the system is detected (Y in ST06), power supply from the emergency generator 14 is stopped (ST07), and power supply from the system is restarted (ST08, see FIG. 4).

(When the power is restored after the emergency generator is started)
When the system is restored after the emergency generator 14 is activated, the circuit breaker on the emergency generator 14 side is cut off, the emergency generator 14 side is opened, and the circuit breaker on the system power supply 13 side is turned on. The side is closed. Therefore, the normal system operation state shown in FIG. 4 is restored.

(Action and effect)
In order to supply power from the UPS 11 to the general load B, it is necessary to supply power from the converter of the input unit of the UPS 11 toward the system power supply 13. However, since the UPS 11 is premised on maintaining the power supply to the UPS load C such as a server, the general load is not limited according to the size of the surplus capacity so that only the surplus capacity of the UPS 11 is used. Don't be.

  Therefore, in the power supply system 10 of the first embodiment, the calculation unit 3 subtracts the capacity of the UPS load C from the remaining capacity of the UPS 11 to obtain the surplus capacity of the UPS 11, and the load selection unit 6 within the range of the surplus capacity Select general load B. The open / close command unit 7 outputs a closing command to the general load B, and outputs a shut-off command to the unselected general load A.

  The communication unit 5 on the monitoring control unit 12 side transmits a power supply command to the communication unit 4 on the UPS 11 side, and the UPS 11 receives the power supply command as a discharge command, and from the battery 2 through the bidirectional converter 1 according to the discharge command, the general load B Only power for surplus capacity is supplied to Therefore, there is no fear that the UPS 11 uses power exceeding the surplus capacity, and there is no possibility that the amount of power supplied to the UPS load C will be insufficient.

  As described above, according to the present embodiment, by supplying power for the surplus capacity of the UPS 11 to the general load B, compared to the power supply by the emergency generator 14 that requires a start-up time of about several seconds at the shortest, the general load The power supply to B can be resumed immediately. Therefore, it is possible to grasp the current situation immediately after the system power failure, and contribute to accurate determination support. As described above, in the present embodiment, when the system power failure occurs, the UPS 11 can supply power from only the UPS load C to the general load B, and the power supply function of the UPS 11 can be expanded to increase the cost. Therefore, it is possible to easily realize BCP correspondence.

  In addition, in this embodiment, even if the UPS load C is added and the surplus capacity of the UPS 11 changes, the calculation unit 3 obtains the surplus capacity of the UPS 11 each time, so that the change in the surplus capacity of the UPS 11 is always accurately captured. be able to. Therefore, only the power for the surplus capacity of the UPS 11 can be used appropriately, and power supply to the general load B can be performed without degrading the power supply performance for the UPS load C, which is the original role, and high reliability is achieved. Can be obtained.

  Further, in the present embodiment, in the UPS 11, the bidirectional converter 1 acquires a voltage signal from the emergency generator 14 and controls the output to match the voltage, frequency and phase, and the UPS 11 and the emergency generator 14. Are taking sync. Therefore, the power supply can be smoothly switched from the UPS 11 to the emergency generator 14 without stopping the power supply to the general load B at all. As a result, when a system power failure occurs, not only the UPS load C but also the selected general load B can be stably supplied without interruption. Thereby, it is possible to improve the quality of the UPS 11.

(2) Other Embodiments The above-described embodiments are presented as examples in this specification, and are not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

[a] For example, the present embodiment can be applied to a parallel redundant UPS system or a common backup UPS system. In the common spare system, the UPS includes a spare unit, and the input unit of only this spare unit is a bidirectional converter, and the calculation unit obtains the surplus capacity by subtracting the capacity of the UPS load from the remaining capacity of the spare unit. Good. In such an embodiment, since the surplus capacity is obtained using only the remaining capacity of the UPS spare unit, there is no concern that the UPS will use the power exceeding the surplus capacity. Thereby, it is possible to completely eliminate the anxiety that the power supplied to the UPS load C is insufficient when a system power failure occurs.

 [b] In the parallel redundant system, a plurality of UPSs are connected in parallel, and the input units of all the UPSs are bidirectional converters. The calculation unit subtracts the capacity of the UPS load from the total remaining capacity of all the UPSs to obtain the total surplus capacity of the entire UPS, and the load selection unit calculates the total surplus capacity from the general load according to the total surplus capacity. You may make it select the load which supplies electric power. In this embodiment, by using the total surplus capacity of the entire UPS, it is possible to widen the selection range of general loads to be supplied with power when a system power failure occurs, and to further improve the performance of the UPS.

 [c] The priority set in the load selection unit can be changed. For example, the general load that was in use before the occurrence of a system power failure may be preferentially selected from the general loads. . In this embodiment, even if a system power failure occurs, the situation before the power failure can be maintained, and the influence of the power failure can be minimized.

 [d] The number or combination of general loads selected by the load selection unit is free depending on the size of the surplus capacity required by the calculation unit, and only the surplus capacity can be used to the maximum.

 [e] When the surplus capacity required by the calculation unit falls below a predetermined value, the power supply to the general load may be stopped. According to this embodiment, if the surplus capacity of the UPS is less than a predetermined value, power is not supplied to other than the UPS load C, so that the reliability as the UPS can be maintained.

DESCRIPTION OF SYMBOLS 1 ... Bidirectional converter 2 ... Battery 3 ... Calculation part 4, 5 ... Communication part 6 ... Load selection part 7 ... Opening / closing command part 10 ... Electric power supply system 11 ... UPS
12 ... Supervisory control unit 13 ... System power supply 14 ... Emergency generator

Claims (8)

An uninterruptible power supply that supplies power to critical loads that do not allow blackouts;
A calculation unit for subtracting the capacity of the important load from the remaining capacity of the uninterruptible power supply to obtain a surplus capacity of the uninterruptible power supply; and
A load selection unit that selects a load that supplies power for the surplus capacity from a general load that is a load other than the important load according to the surplus capacity; and
An open / close command unit that outputs a closing command to the general load selected by the load selection unit, and outputs a shut-off command to the general load other than the load selection unit selected;
A communication unit that transmits a power supply command to the uninterruptible power supply to supply power to the general load selected by the load selection unit;
A bidirectional converter provided at the input of the uninterruptible power supply;
A power supply system comprising: The uninterruptible power supply comprises a spare machine,
The input unit of only the spare machine is the bidirectional converter,
2. The power supply system according to claim 1, wherein the calculation unit obtains the surplus capacity by subtracting the capacity of the important load from the remaining capacity of the spare machine. Connecting a plurality of the uninterruptible power supplies in parallel;
The input unit of all the uninterruptible power supply devices as the bidirectional converter,
The calculation unit subtracts the capacity of the important load from the total remaining capacity of all the uninterruptible power supply units to obtain the total surplus capacity of the entire uninterruptible power supply unit provided in parallel,
The load selection unit selects a load that supplies electric power for the total surplus capacity from general loads other than the important load according to the total surplus capacity. The power supply system described in 1.   The power supply system according to any one of claims 1 to 3, wherein the load selection unit selects the general load in accordance with a preset priority order.   The load selection unit preferentially selects a general load of the safety system when the general load includes a general load of the security system and a general load other than the security system. The power supply system of any one of -4.   6. The power according to claim 1, wherein the load selection unit preferentially selects a general load in use before the occurrence of a system power failure from the general loads. Supply system. An emergency generator that supplies power to the general load when a system power failure occurs,
The uninterruptible power supply device acquires a voltage signal from the emergency generator, controls an output in accordance with the voltage signal, and synchronizes with the emergency generator. The power supply system according to any one of claims.   The said uninterruptible power supply device stops the electric power supply to the said general load, if the said surplus capacity calculated | required by the said calculating part falls below predetermined value, The any one of Claims 1-7 characterized by the above-mentioned. The power supply system described.

Images