JP5523187B2 - Power switching method - Google Patents

Description

  The present invention relates to a power supply switching method, and more particularly to a power supply switching method in a power supply facility in which one spare engine generator is arranged for a plurality of engine generators.

  When supplying power to various loads used in outdoor event venues where commercial power cannot be sufficiently obtained, a portable engine generator that drives a generator with an engine is used. In this case, a spare engine generator and a power switching device are arranged for when an abnormality occurs in the engine generator, and when an abnormality occurs in the engine generator that is supplying power, the spare engine generator The power is supplied by switching to a machine (see, for example, Patent Document 1).

JP 2008-99404 A

  Normally, two engine generators having the same power generation capacity are used, and one of them is used for regular use, and the other is used for backup, so that switching when an abnormality occurs can be easily performed. However, when the number of loads is large, it is uneconomical to use an engine generator with a large power generation capacity. Therefore, it is possible to use a plurality of engine generators with appropriate power generation capacity and use one as a spare. Has been done. In this case, even if an abnormality occurs in one engine generator, necessary and sufficient power can be supplied from other engine generators including the spare, but an abnormality has occurred in two engine generators. In this case, since the load of two units is applied to the spare engine generator, the power supply amount exceeds the power generation capacity, the spare engine generator engine stops, and the spare engine generator cannot supply power. There was a case.

  Accordingly, an object of the present invention is to provide a power supply switching method that can stably supply power from a spare engine generator even if an abnormality occurs in the engine generator.

In order to achieve the above object, the power switching method of the present invention includes a plurality of common generators for supplying power to a plurality of loads, and one standby generator, and an abnormality occurs in the common generator. In the power supply switching method for switching the power supply to the load from the normal generator in which an abnormality has occurred to the standby generator, the main power supply voltage supplied from the normal generator to the load, and the normal generator The control power supply voltage is monitored, and when both the main power supply voltage and the control power supply voltage have voltage, it is determined that the power generation state is normal, and when both the main power supply voltage and the control power supply voltage are non-voltage, the normal stop state is set. In the normal power generation state and the normal stop state, switching to the standby generator is not performed, and when the main power supply voltage is no voltage and the control power supply voltage has a voltage, it is determined that an abnormality has occurred, and the load What Is switched from the normal generator determined to be in the state of occurrence of the abnormality to the standby generator , an abnormality occurs in one normal generator, and power is supplied from the one normal generator in which the abnormality has occurred. When the power supply to the load that has been performed is switched to the power supply from the standby generator, even if an abnormality occurs in another normal generator, the power is supplied from the other normal generator in which the abnormality has occurred. without switching the power supply to go though the load on the standby generator, continuing the power supply from the standby generator to the abnormality is performing the power supply from a single common generator generated load It is characterized by.

Further, the power supply switching method of the present invention, when the abnormality becomes the power supply is ready to load by eliminating abnormal one conventional generator occurs, the power supply to the load by the return signal, The standby generator is switched to a regular generator in which the abnormality has been resolved.

  According to the power source switching method of the present invention, even if an abnormality occurs in one normal generator and power is supplied by switching to the standby generator, the standby generator is generated even if an abnormality occurs in the other normal generators. Since there is no switching to power supply from the standby generator, it is no longer possible to simultaneously supply power to multiple loads from one standby generator, the supplied power does not exceed the power generation capacity of the standby generator, and the standby generator stops. Can be prevented.

  Further, by monitoring the main power supply voltage and the control power supply voltage, it is possible to automatically and quickly switch from the detection of the occurrence of abnormality to the standby generator. In addition, when the abnormality of the normal generator in which an abnormality has occurred is resolved, the power supply is switched to the normal generator by a temporary test operation during the operation to eliminate the abnormality by switching the power supply to the normal generator by a return signal. The power supply to the load can be performed stably.

It is explanatory drawing which shows an example of the power supply equipment to which the power supply switching method of this invention is applied. It is explanatory drawing of the power supply switching apparatus in the power supply switching method of this invention. It is a flowchart which shows an example of the power supply switching method of this invention.

  The power supply switching method shown in this embodiment is a plurality of (two or more) engine generators (ordinary generators A, B, C,...) That individually supply power to a plurality of loads 11a, 11b, 11c,. And one spare engine generator (spare generator S) are arranged, and an abnormality occurs in the common generators A, B, C,... And power is supplied to the loads 11a, 11b, 11c,. Is configured to switch the power supply to the load 11a that has been supplied with power from one normal generator, for example, the normal generator A, to the power supply from the standby generator S. Applicable to power supply facilities.

  Each of the common generators A, B, C,... Is provided with a power supply switching device 12a, 12b, 12c,... Corresponding to each of the common generators A, B, C,. , B, C,... Are supplied with power via the power switching devices 12a, 12b, 12c,. The power supply switching devices 12a, 12b, 12c,... Monitor the power generation state of the corresponding normal generators A, B, C,. When the power supply to 11b, 11c,... Stops, the operation of the standby generator S is started, and the power is automatically switched so as to supply power from the standby generator S. The power supply switching devices 12a, 12b,. 12c,... Are provided with a control device 13 and a power switching contactor 14, respectively.

  The power switching contactor 14 is connected to the main power cables 15a, 15b, 15c,... Connected to the service generators A, B, C,... And the loads 11a, 11b, 11c,. Are connected to the power supply cables 16a, 16b, 16c,... And the standby power cables 17a, 17b, 17c,. Further, the control device 13 includes a power generator switching control cable 18 for connecting the control devices 13 of the power supply switching devices 12a, 12b, 12c,... And a standby generator S by the power supply switching devices 12a, 12b, 12c,. A generator control cable 19 for control is connected.

  In a normal operation state in this power supply facility, the operation of the control device 13 causes the power switching contactor 14 to be connected to the main power cables 15a, 15b, 15c,. The power supply cables 16a, 16b, 16c,... Are connected to the loads 11a, 11b, 11c,..., And the power generators A, B, C,. Power is supplied to the loads 11a, 11b, 11c,.

  When an abnormality occurs in one common generator, for example, the common generator A, the power generation stops and the power supply from the regular generator A to the load 11a cannot be performed, the control device 13 of the power switching device 12a A signal for starting the standby generator S is output to the generator control cable 19, and the power source switching contactor 14 is switched to the standby generator S side, and power is supplied from the standby generator S to the load 11a via the standby power cable 17a. Switch to do.

  At this time, the control device 13 of the power switching device 12a indicates that the power generator 12a is switched to the standby side and the standby generator S is in operation with respect to the other power switching devices 12b, 12c,. A power switching signal is transmitted through the power switching control cable 18. When the other power switching devices 12b, 12c,... Receive the power switching signal from the power switching control cable 18, they fix the power switching contactor 14 to the state of holding the power generator B, C,. Even when an abnormality occurs in the normal generators B, C,..., Power supply to the other loads 11 b, 11 c,... Cannot be performed, power is supplied to the other loads 11 b, 11 c,. Is prohibited, and the power supply from the standby generator S to the load 11a is continued.

  Switching from the abnormal occurrence of the normal generator to the standby generator S can be done manually, but the main power supply voltage (generator power generation voltage, main power cable voltage, etc.) and control power supply voltage (regular power generation) This can be done automatically by monitoring the voltage of the engine controller (ECU) in the machine via the monitoring cables 20a, 20b, 20c. That is, in a normal generator comprising a general engine generator, the main switch is turned on and the ECU is energized to start the engine, and the engine is driven by the engine to generate power. When both the voltage and the control power supply voltage have voltage, it can be determined that the power generation state is normal. Conversely, when both the main power supply voltage and the control power supply voltage are non-voltage, it can be determined that the engine is stopped by turning off the main switch. Therefore, since the normal generator is in a normal state during the normal power generation state and the normal stop state, the power supply from the normal generator is continued without switching to the standby generator S.

  On the other hand, when the main power supply voltage is no voltage and the control power supply voltage has a voltage, the main switch is ON but no power is generated. For example, the engine is out of fuel or the engine itself has failed. It can be determined that an abnormality has occurred, such as when the camera stops. Therefore, by setting so that the power supply to the load is switched from the normal generator to the standby generator S when the main power supply voltage is no voltage and the control power supply voltage has a voltage, The power supply can be switched automatically.

  In addition, when inspection and repair of a normal generator in which an abnormality has occurred is completed and normal power generation is possible, switching (recovery) from the standby generator S to the normal generator is based on the determination criteria. The power supply from the standby generator S can be stably performed by switching after waiting for the input of the return signal (recovery permission signal) to the power supply switching device without performing it automatically. For example, when a test operation for checking the power generation state of the generator is performed in a short time by turning on the main switch during inspection, both the main power supply voltage and the control power supply voltage have voltages, Power recovery is performed by determining that the power generation state is normal, and power recovery and switching are repeated each time a test operation is performed, and power supply to the load becomes unstable.

  For this reason, when inspection and repair of the service generator in which an abnormality has occurred is completed and power supply from the service generator to the load can be performed reliably, for example, manual operation such as a push button switch provided on the power switch A power recovery permission signal is output by operation, and the power supply to the load is set to be switched from the standby generator S to the regular generator, so that the power supply to the load when an abnormality occurs can be performed in a stable state. it can.

  Next, an automatic power switching procedure in the power switching device 12a provided corresponding to the regular generator A will be described with reference to FIG. First, after starting the common generator A, in step 51, the standby generator S is set to the automatic start mode in which the operation mode of the standby generator S is automatically started by a signal from the generator control cable 19, and the standby generator S is put on standby. In step 52, the power switching device 12a is set to the automatic switching mode, the power switching contactor 14 is set to the main power cable 15a side, and power is supplied from the regular generator A to the load 11a. In step 53, the state of the service generator A is monitored based on the determination criteria. If no abnormality such as a power failure or failure has occurred (No), step 53 is repeated.

  If it is determined in step 53 that an abnormality has occurred in the service generator A (Yes), the process proceeds to step 54 where the status of the other power supply switching devices 12b, 12c,. Are determined to have already been switched to the standby generator S. If it is determined that the standby power generator S has already been switched (Yes), the process proceeds to step 55. Step 55 is repeated until the other power switching devices 12b, 12c,... Are restored and the power switching device 12a can be switched.

  Further, when it is determined in step 54 that the other power source switching devices 12b, 12c,... Have not been switched to the standby generator S (No), the routine proceeds to step 56 and a start signal is sent from the generator control cable 19 to the standby generator S. Is output, the engine of the standby generator S is started, and power generation from the generator is started. Similarly, when it is determined in step 55 that the power supply switching device 12a is in a switchable state (Yes), the process proceeds to step 56 and the operation of the standby generator S is started.

  Next, in step 57, it is determined whether the voltage of the standby generator S has been established. For example, when it is determined that the engine has failed to start and the voltage has not been established, the process returns to step 56 (No), and the voltage has been established. (Yes), the process proceeds to step 58 where the power switching contactor 14 is switched from the main power cable 15a side to the standby power cable 17a side, and in step 59, power supply from the standby generator S to the load 11a is started. .

  While power is being supplied from the standby generator S to the load 11a, it is determined in step 60 whether or not the service generator A has been inspected and repaired so that power can be restored, and the service generator A can be restored. If it is determined that it is not (No), this step 60 is repeated. When it is determined in step 60 that the utility generator A is in a power-recoverable state (Yes), the process proceeds to step 61 to determine the presence / absence of the power recovery permission signal. When there is no power recovery permission signal, step 61 is repeated (No). ). When the power recovery permission signal is confirmed, the process proceeds to step 62 (Yes), the power switching contactor 14 is switched from the standby power cable 17a side to the main power cable 15a side, and the power supply to the load 11a is switched to the utility generator A. The standby generator S is set in a standby state.

  When the automatic power supply switching operation is terminated, the automatic switching mode of the power supply switching device 12a is turned off in step 63. When monitoring the state of the service generator A and continuing the automatic switching state, the process returns from step 62 to step 53.

  As described above, when power is supplied by switching from one normal generator A to the standby generator S, even if an abnormality occurs in the other normal generators B, C,. By prohibiting the switching of the power supply to the load 11b to the standby generator S, the power supply from the single standby generator S to the two systems of the loads 11a and 11b is not simultaneously performed. As a result, the amount of power supplied to both the loads 11a and 11b exceeds the power generation capacity of the standby generator S, and a large load is applied to the engine of the standby generator S. The power supply to the loads 11a and 11b can be prevented from being cut off, and the power supply to the load 11a can be continued.

  In addition, monitoring of the abnormality occurrence state of the regular generator may be based on only the main power supply voltage, based on the signal from the control device provided in the regular generator, the state of the pilot lamp indicating the operation state, etc. It is also possible to determine. In addition, power recovery to the regular generator can be performed using a timer or the like. In addition, engine generators with the same power generation capacity are usually used for the regular generator and the standby generator, but when the generators with different generation capacities are used in combination, the maximum power generation among the regular generators is used. An engine generator having a generation capacity commensurate with the capacity is used as a standby generator. Moreover, the power supply switching device can form the procedure shown in the flowchart with a relay circuit in which a plurality of relays are combined.

  11a, 11b, 11c ... load, 12a, 12b, 12c ... power switching device, 13 ... control device, 14 ... power switching contactor, 15a, 15b, 15c ... main power cable, 16a, 16b, 16c ... feeding cable, 17a , 17b, 17c ... standby power cable, 18 ... power supply switching control cable, 19 ... generator control cable, 20a, 20b, 20c ... monitoring cable, A, B, C ... regular generator, S ... standby generator

Claims (2)

A plurality of common generators that supply power to a plurality of loads, and one standby generator are arranged, and when an abnormality occurs in the normal generator, an abnormality occurs in the power supply to the load. In the power supply switching method for switching from the generator to the standby generator, the main power supply voltage supplied to the load from the regular generator and the control power supply voltage of the regular generator are monitored, and the main power supply voltage and the control power supply voltage are monitored. When both of them have voltage, it is determined that the power generation state is normal. When both the main power supply voltage and the control power supply voltage are non-voltage, it is determined that the power supply is normally stopped. Switching to the generator is not performed. When the main power supply voltage is no voltage and the control power supply voltage has a voltage, it is determined that an abnormality has occurred, and the power supply to the load is determined to be the abnormality occurrence state. Departure When switching from the electric machine to the standby generator , an abnormality occurs in one normal generator, and the power supply from the standby generator to the load that was supplying power from the one normal generator in which the abnormality has occurred When switching to power supply, even if an abnormality occurs in another normal generator, the power supply to the load that was supplying power from the other normal generator in which the abnormality occurred is switched to the standby generator Without stopping, the power supply switching method of continuing the power supply from the said standby generator to the load which was supplying the power from one normal generator in which the said abnormality generate | occur | produced. When the abnormality of one normal generator in which an abnormality has occurred is resolved and power can be supplied to the load, the normal power generation in which the abnormality has been eliminated from the standby generator by supplying a power to the load by a return signal 2. The method for switching power supply according to claim 1 , wherein switching to a machine is performed .

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