JP2014007930A - Emergency power generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency power generating apparatus which does not generate switching power failure at the time of switching power supply, does not generate maintenance power failure at the time of maintenance work of an uninterruptible power supply system (UPS), such as battery replacement, and which maintains power supply to a load device even when a failure occurs to the uninterruptible power supply system.SOLUTION: In the emergency power generating apparatus which supplies power to a power switching device 5 from an input terminal 2 and to a load device 7 through an output terminal 4 in an ordinary time, and which supplies power to the power switching device 5 from a power generator 3 and to the load device 7 through the output terminal 4 at the occurrence of the power failure, an emergency power generating apparatus 1 has an uninterruptible power supply system 11 which is connected between the power switching device 5 and the output terminal 4, a bypass circuit 12 connected in parallel with the uninterruptible power supply system 11, and a bypass switching device 13 which selectively connects the uninterruptible power supply system 11 or the bypass circuit 12 to the output terminal 4.

Description

  The present invention relates to an emergency power generator configured to supply power to a load device when a power failure occurs.

  An emergency power generator is used to supply power to load equipment when a power failure occurs (see, for example, Patent Document 1). FIG. 4 shows an outline of a conventional emergency power generator. The emergency power generator 1X includes an input terminal 2 connected to the external commercial power source 6 side, a generator 3 arranged in parallel with the input terminal 2, and an output terminal 4 connected to the external load device 7 side. The power supply switching device 5X for selectively connecting the input terminal 2 or the generator 3 to the output terminal 4 is provided. This emergency power generator 1X normally supplies electricity from the input terminal 2 to the load device 7 via the power switch 5 and the output terminal 4, and when a power failure occurs, the power generator 5 and the output terminal 4 from the power generator 3. It is comprised so that electricity may be supplied to the load apparatus 7 via.

  Here, the load device 7 is a device that operates upon receiving power supply, and is, for example, a traffic light, an illumination lamp, a computer, or the like. The generator 3 is configured by a combination of a power device such as a diesel engine and a motor that converts the power of the power device into electric power. The white arrow conceptually shows the flow of electricity.

  Next, the operation of the emergency power generator 1X will be described. In the emergency power generator 1X, the input terminal 2 and the output terminal 4 are normally connected by a power switch 5X. With this configuration, the power supplied from the commercial power source 6 can be transmitted to the load device 7.

  On the other hand, when a power failure occurs and the power supply from the commercial power supply 6 is stopped, the emergency power generator 1X switches the power switch 5X to connect the generator 3 and the output terminal 4. At the same time, the generator 3 operates the diesel engine, generates power using the power of the diesel engine, and supplies electricity to the load device 7. With this configuration, the emergency power generator 1X can supply power to the load device 7 even when a power failure occurs.

  However, when the power generator 5X is switched from the input terminal 2 side to the generator 3 side, the emergency power generator 1X generates a temporary power failure state (switching power failure) in which power is not supplied to the load device 7. Have the problem of This is a problem that occurs because a certain time (several tens of seconds) is required until the diesel engine of the generator 3 is started and starts to supply power. Also, when the power switch 5X, which is a switch, switches from the input terminal 2 side to the generator 3 side, a moment occurs when the power switch 5X is not in contact with the commercial power source 6 side or the generator 3 side. This is a problem that arises. Some load devices 7 such as traffic lights cannot be allowed even in this temporary power failure state (switching power failure). Further, when the load device 7 is a computer or the like, there is a problem that even a momentary power failure causes a data crash or the like.

  Thus, a configuration has been proposed in which an uninterruptible power supply (also referred to as UPS) is connected to the emergency power generator 1X (see, for example, Patent Document 2). FIG. 5 shows an outline of an emergency power generation apparatus provided with a UPS. The emergency power generator 1Y is configured to connect a UPS 11Y between the output terminal 4 and the load device 7. Here, the UPS 11Y is a power storage device configured to mainly include a battery, a rectifier circuit, an inverter, and the like.

With the configuration in which the UPS 11Y is installed, it is possible to avoid a temporary power failure state (switching power failure) that has occurred when the power switch 5Y is switched. This is because power can be supplied from the battery of the UPS 11Y to the load device 7 even when power is not supplied from the commercial power supply 6 or the generator 3. Therefore, the emergency power generator 1Y can supply power to the load device 7 without interruption even when a power failure occurs.

  However, the emergency power generator 1Y provided with the UPS 11Y has several problems. First, there is a problem that a temporary power failure state (maintenance power failure) occurs when performing maintenance inspection such as replacement of the battery of the UPS 11Y. Although this maintenance power outage is not a sudden power outage, since the power supply to the load device 7 is stopped, the load device 7 cannot be used during the maintenance inspection. If the load device 7 is, for example, a traffic light, an elevator, or the like, work such as traffic control is necessary to stop the load device 7 safely.

  Second, there is a problem that electricity is not supplied to the load device 7 when a failure occurs in the UPS 11Y. Even if a power failure does not occur in the commercial power supply 6, the power supply to the load device 7 may be interrupted. That is, the installation of the UPS 11Y increases new factors that hinder the stable operation of the load device 7.

Japanese Patent Laying-Open No. 2005-020879 Japanese Patent Laid-Open No. 10-243579

  The present invention has been made in view of the above problems, and the purpose thereof is an emergency power generation device connected between a commercial power supply and a load device, so that a switching power failure does not occur at the time of switching the power supply. A maintenance power outage does not occur during maintenance and inspection work such as battery replacement of the UPS, and power supply to the load equipment is maintained even when a failure occurs in the UPS It is to provide a power generator for a vehicle.

  In order to achieve the above object, an emergency power generator according to the present invention normally supplies electricity to load equipment from an input terminal via a power switch and an output terminal, and from a generator to a power switch when a power failure occurs. And an emergency power generator that supplies electricity to the load device via the output terminal, wherein the emergency power generator is connected between the power switch and the output terminal, and the uninterruptible device, A bypass circuit connected in parallel, and a bypass switch that selectively connects the uninterruptible device or the bypass circuit to the output terminal.

  With this configuration, the emergency power generator does not generate a switching power failure when a power failure occurs. This is because power is supplied to the load device from the uninterruptible power supply connected to the output terminal via the bypass switch. In addition, the emergency power generator does not generate a maintenance blackout during maintenance and inspection of the uninterruptible power supply. This is because electricity can be sent through the bypass circuit by the operation of the bypass switch. Even if a failure or the like occurs in the uninterruptible power supply, this bypass circuit can maintain power supply to the load equipment. In addition, this uninterruptible power supply (UPS) has a rectifier circuit, an inverter, etc. other than a battery.

In the above emergency power generator, the emergency power generator has a control device, and the control device controls the operation of the power switch and the bypass switch, so that the input terminal is normally operated. A configuration for performing normal control for supplying electricity to the output terminal via the power switch, the uninterruptible device, and the bypass switch; and, when a power failure occurs, from the generator, the power switch, A configuration for performing emergency power generation control for supplying electricity to the output terminal via a power failure device and the bypass switch, and at the time of maintenance check or failure of the uninterruptible device, from the input terminal, the power switch, It has the structure which performs the maintenance control which supplies electricity to the said output terminal via a bypass circuit and the said bypass switch.

  With this configuration, the same effects as described above can be obtained. Moreover, since the uninterruptible power supply can always be charged from a commercial power source during normal control, sufficient power can be supplied to the load device when a power outage occurs.

  According to the emergency power generator according to the present invention, there is no switching power failure when the power source is switched, no maintenance power failure occurs during maintenance inspection work such as battery replacement of the uninterruptible power supply (UPS), and Even when a failure occurs in the uninterruptible power supply, it is possible to provide an emergency power generator that can maintain power supply to the load equipment.

It is the figure which showed the outline of the normal control of the emergency power generation device of embodiment which concerns on this invention. It is the figure which showed the outline of emergency power generation control of the emergency power generation device of embodiment which concerns on this invention. It is the figure which showed the outline of the maintenance control of the emergency power generator of embodiment which concerns on this invention. It is the figure which showed the outline of the conventional emergency power generator. It is the figure which showed the outline at the time of providing an uninterruptible power device side by side with the conventional emergency power generation device.

  Hereinafter, an emergency power generator according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of normal control of the emergency power generator 1 according to the embodiment of the present invention. The emergency power generator 1 includes an input terminal 2 connected to an external commercial power source 6, a power generator 3, and a power switch 5 that is selectively connected to the input terminal 2 or the power generator 3. The emergency power generator 1 includes an uninterruptible power supply (UPS) 11 and a bypass circuit 12 connected in parallel to the power switch 5, a bypass switch 13 selectively connected to the UPS 11 or the bypass circuit 12, The output terminal 4 is connected to the bypass switch 13 and connected to the external load device 7. Further, the emergency power generator 1 has a control device 15. The control device 15 acquires the measurement value of the voltmeter 21 arranged near the input terminal 2 and the operation information of the UPS 11, and controls the operation of the generator 3, the power switch 5 and the bypass switch 13. be able to. In FIG. 1, a one-dot chain line connecting the control device 15 and each device indicates a signal line. Further, the UPS 11 different from the conventional one is installed inside the emergency power generator 1.

  Next, the operation of the emergency power generator 1 will be described. First, normal control performed at normal time will be described. In the normal control, the power switch 5 is connected to the input terminal 2 side and the bypass switch 13 is connected to the UPS 11 side according to a command signal from the control device 15. Therefore, electricity supplied from the external commercial power supply 6 is supplied from the input terminal 2 to the load device 7 via the power supply switch 5, the UPS 11, the bypass switch 13 and the output terminal 4. At this time, the battery mounted on the UPS 11 is configured to be charged at the same time.

  Next, emergency power generation control performed when a power failure occurs will be described. FIG. 2 shows an outline of emergency power generation control of the emergency power generator 1A. The emergency power generation control is started when the control device 15 detects the occurrence of a power failure from the value of the voltmeter 21.

  First, the control device 15 sends an activation signal to the generator 3, starts the diesel engine of the generator 3, and starts power generation. At the same time, the control device 15 sends an operation signal to the power switch 5A to connect the power switch 5A to the generator 3 side. At this time, the load device 7 receives power sharing without interruption from the UPS 11 incorporating the battery. Thereafter, when the start-up of the generator 3 is completed and power generation is started, power is sent to the load device 7 via the UPS 11. At this time, the battery mounted on the UPS 11 is configured to be charged at the same time.

  When the control device 15 detects the recovery from the power failure from the value of the voltmeter 21, the normal control is restored. For restoration to normal control, the control device 15 sends an operation signal to the power switch 5A, connects the power switch 5A to the input terminal 2, and sends a stop signal to the generator 3. This is realized by controlling to stop the diesel engine.

  With the above configuration, the following operational effects can be obtained. First, the emergency power generator 1 does not generate a switching power failure when a power failure occurs. This is because when the power switch 5A is connected to the generator 3, the power can be continuously supplied from the UPS 11 to the load device 7.

  Second, when the emergency power generator 1 recovers from a power failure, no switching power failure occurs. This is because, similarly to the above, when connecting the power switch 5A to the input terminal 2 side, power can be supplied to the load device 7 from the UPS 11 that is sufficiently charged by the electricity of the generator 3.

  Next, maintenance control performed during maintenance inspection of the UPS 11 will be described. FIG. 3 shows an outline of maintenance control of the emergency power generator 1B. Maintenance control is started when maintenance inspection such as battery replacement of the UPS 11 is performed. Specifically, for example, a signal is sent to the control device 15 by an operator's switch operation or the like to start.

  First, the control device 15 sends an operation signal to the bypass switch 13B to connect the bypass switch 13B to the bypass circuit 12 side. Thereafter, the worker inspects and replaces the battery of the UPS 11. After the maintenance inspection of the UPS 11 is completed, the bypass switch 13B is connected to the UPS 11 side by an operator's switch operation or the like, and the maintenance inspection work is completed.

  With this configuration, the emergency power generator 1B can obtain an effect that no maintenance power failure occurs during maintenance inspection. This is because when the battery of the UPS 11 is removed, power can be supplied from the bypass circuit 12 to the load device 7. Therefore, power supply to the load device 7 can be realized even during the inspection work of the UPS 11. Specifically, when the load device 7 is a traffic light, it is possible to perform maintenance and inspection work of the UPS 11 even during daytime when there is a lot of traffic. Therefore, the time cost and the monetary cost of the maintenance and inspection work of the UPS 11 can be greatly suppressed.

  Note that it is preferable that the maintenance control be executed even when a failure or the like occurs in the UPS 11. Specifically, when detecting the failure of the UPS 11, the control device 15 sends an operation signal to the bypass switch 13B to connect the bypass switch 13B to the bypass circuit 12 side. With this configuration, it is possible to avoid a situation in which power is not supplied to the load device 7 due to a failure of the UPS 11 although no power failure has occurred.

  Here, when the bypass switch 13B is switched, the power supply to the load device 7 is momentarily interrupted. However, when the load device 7 is a traffic light or the like, the time during which the power supply is interrupted is instantaneous, so that there is no significant trouble in traffic or the like. Further, when the load device 7 is a computer or the like, an instantaneous power failure by the bypass switch 13B is planned, so that the operation of stopping the computer or the like can be performed.

  Furthermore, since the generator 3, the UPS 11 and the control device 15 are installed as a unit in the emergency power generator 1, it is easy to replace the emergency power generator 1 with a conventional emergency power generator. The effects of the present invention can be obtained.

1, 1A, 1B Emergency power generator 2 Input terminal 3 Generator 4 Output terminal 5, 5A Power switch 6 Commercial power supply 7 Load equipment 11 Uninterruptible power supply (UPS)
12 Bypass circuits 13, 13B Bypass switch 15 Control device

Claims (2)

In an emergency power generator that supplies electricity from the input terminal to the load equipment via the power switch and output terminal, and supplies electricity to the load equipment from the generator via the power switch and output terminal when a power failure occurs ,
The emergency power generation device includes an uninterruptible device connected between the power switch and the output terminal, a bypass circuit connected in parallel with the uninterruptible device, and the uninterruptible device with respect to the output terminal. Alternatively, an emergency power generator having a bypass switch for selectively connecting the bypass circuit. The emergency power generator has a control device,
The control device controls the operation of the power switch and the bypass switch,
A configuration for performing normal control to supply electricity from the input terminal to the output terminal through the power switch, the uninterruptible power supply, and the bypass switch at normal times;
A configuration for performing emergency power generation control for supplying electricity from the generator to the output terminal via the power switch, the uninterruptible device, and the bypass switch when a power failure occurs,
The maintenance control of supplying power to the output terminal from the input terminal via the power supply switch, the bypass circuit and the bypass switch at the time of maintenance inspection or failure of the UPS The emergency power generator according to claim 1.

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