JPH11262177A - Different frequency relief electric power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve electric power supply promptly if electric power cannot be supplied from regular frequency electric power supply, by parallel-operating emergency frequency electric power supply through the regular frequency electric power supply and a frequency converter at all times. SOLUTION: In normal operation, all AC switches 3a, 3b, 3c are closed, and regular frequency electric power supply 1 and emergency frequency electric power supply 2 are operated in parallel. A frequency converter 5 converts the frequency of the emergency frequency electric power supply 2 at the frequency synchronized with the regular frequency electric power supply 1. Under this conditions, if an accident or the like occurs in the regular frequency electric power supply 1, and the electric power cannot be supplied, the AC switch 3a is opened, the load of the frequency converter 5 is increased, and the electric power supply meeting the load is supplied to a bus 6 in a distribution panel successively. It is thus possible to switch to the emergency frequency electric power supply 2 for supplying the electric power promptly without the need for synchronously controlling the frequency converter 5 additionally, even if the regular frequency electric power supply 1 is isolated from the bus 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system which receives power from a plurality of power supply systems having different frequencies. The present invention relates to a frequency power rescue method.

[0002]

2. Description of the Related Art For example, in a distribution panel installed in a building or a factory, power receiving equipment is configured to receive power from two power systems having different frequencies as a normal power source and an emergency power source. When power supply becomes impossible, the frequency converter is activated to convert the AC input from the emergency frequency power supply to a predetermined frequency, and then the emergency frequency power supply is switched to rescue the power supply.

[0003]

However, in such a different frequency power supply rescue method, when switching from the normal frequency power supply to the emergency frequency power supply, the residual voltage of the power supply equipment is reduced by about 50%.
If the frequency is attenuated below this level, synchronous control of the frequency conversion device cannot be performed, so that the frequency conversion device cannot be started and cannot be switched to the emergency frequency power source, or the emergency frequency power source cannot be switched to the emergency frequency power source. There has been a problem that a power failure occurs for a few seconds during switching to the power supply, and the auxiliary machine stops.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to supply synchronized AC power to a load quickly without a power failure when switching from a normal frequency power supply to an emergency frequency power supply. It is an object of the present invention to provide a different frequency power supply rescue method that can perform the above.

[0005]

According to the present invention, the above object is achieved by the following different frequency power supply rescue method. An invention corresponding to claim 1 is a power supply facility configured to receive power from a plurality of power supply systems having different frequencies through a single bus, wherein the power supply always receives a normal frequency power supply and converts the emergency frequency power supply to a predetermined frequency by a frequency converter. The power supply is converted to a power source, and the common and emergency frequency power supplies are operated in parallel, and as soon as the power supply from the normal frequency power supply is cut off, the emergency frequency power supply rescues the power via the frequency conversion device. It is.

In the method for rescuing a different frequency power supply according to the first aspect of the present invention, the normal frequency power supply is always operated in parallel with the emergency frequency power supply via the frequency conversion device, so that the power supply from the normal frequency power supply is reduced. Even when the power supply becomes impossible, there is no need to perform synchronous control of the frequency conversion device again, and it is possible to quickly increase the load of the frequency conversion device and perform power supply rescue.

According to a second aspect of the present invention, in a power supply facility receiving power from a plurality of power supply systems having different frequencies, when the power supply from a normal frequency power supply is cut off, when switching to power reception from an emergency frequency power supply, The receiving voltage of the emergency frequency power supply is transformed to receive power, and the operation is continued at the emergency frequency.

According to a second aspect of the present invention, there is provided a method for rescuing a different frequency power supply, wherein a normal frequency power supply and an emergency frequency power supply are directly combined so that power cannot be supplied from the normal frequency power supply. Since it is possible to immediately switch to the emergency frequency power supply and supply power to the load, the emergency frequency power supply is transformed to an appropriate voltage from the viewpoint of a constant V / F and supplied with power, thereby bypassing the frequency converter. Power rescue is possible.

According to a third aspect of the present invention, in a power supply system receiving power from a plurality of power supply systems having different frequencies, a load is divided into a power transformer and an important auxiliary machine so as to receive power from a regular frequency power supply, respectively. As soon as the power from the service frequency power supply is cut off, the power transformer directly supplies the emergency frequency power supply without frequency conversion, and the important auxiliary machine supplies power from the emergency frequency power supply via the frequency conversion device. Supply.

In the method for rescuing a different frequency power supply according to the third aspect of the present invention, it is not possible to supply power from the normal frequency power supply by combining the normal frequency power supply and the emergency frequency power supply via the frequency converter. Power can be supplied immediately from the emergency frequency power supply, so power can be supplied directly from the emergency frequency power supply without frequency conversion to the power transformer group, and the emergency frequency power supply can be supplied to the important auxiliary equipment group. By supplying power converted from the frequency of
Quick power switching is possible for the group of power transformers.

According to a fourth aspect of the present invention, in a power supply facility comprising a plurality of buses receiving power from a plurality of power supply systems having different frequencies, the bus receiving the common frequency power supplies power to a load for the common frequency. The bus receiving the emergency frequency power supply has a backup load for the emergency frequency, and normally operates the electrical equipment for the normal frequency with the backup equipment for the emergency frequency stopped, and As soon as the power supply from the power supply is cut off, power is supplied from the emergency frequency power supply to the backup equipment for the emergency frequency and operated.

According to a fourth aspect of the present invention, there is provided a method for rescuing a different frequency power supply, comprising both a normal frequency power supply and an emergency frequency power supply having a different frequency from the normal frequency power supply. In the event that it becomes impossible, the equipment is started up immediately to back up the emergency frequency power supply equipment and rescue, so even when receiving power from the emergency frequency power supply quickly without using a frequency conversion device Switching control is possible.

According to a fifth aspect of the present invention, there is provided a power supply system comprising a plurality of buses receiving power from a plurality of power supply systems having different frequencies, wherein a frequency device comprises a bus for directly receiving a normal frequency power supply and an emergency frequency power supply. , And a circuit that connects these buses, and the bus communication circuit is always disconnected, and the normal frequency power supply and the emergency frequency power supply are received by the respective buses. When the power supply is interrupted, the bus communication circuit is turned on and power is immediately supplied from the emergency frequency power supply.

In the method for rescuing a different frequency power supply according to the fifth aspect of the present invention, a separate power supply converted from the emergency frequency power supply into a normal frequency by a frequency conversion device is previously incorporated into an in-house power supply configuration. However, if power supply becomes impossible due to a system accident or the like, power is supplied to the load from the emergency frequency power supply even during normal operation, so the frequency converter must be renewed even when the service power supply system fails. Need not be controlled synchronously, and quick switching is possible.

According to a sixth aspect of the present invention, in a power supply facility receiving power from a plurality of power supply systems having different frequencies, when the power receiving system is switched, the power is converted to a predetermined frequency by a frequency conversion device and the power is received. Power is received from the power supply via the frequency conversion device, and when the power supply is cut off from the regular frequency power supply device, the power receiving system is switched to the emergency frequency power supply system side, and from the emergency frequency power supply via the frequency conversion device. The operation is continued by receiving power.

In the method of rescuing a different frequency power supply according to the invention according to claim 6, the frequency conversion device is provided by power supply equipment incorporating two systems, a normal frequency power supply and an emergency frequency power supply having a different frequency. By supplying power to the auxiliary equipment via the power supply, when the service frequency power supply fails, the auxiliary equipment can be continuously operated by switching to the emergency frequency power supply side and performing frequency correction by the frequency converter.

According to a seventh aspect of the present invention, in a power supply system receiving power from a plurality of power supply systems having different frequencies, a regular frequency power supply is received, and the emergency frequency power supply is always synchronized with the regular frequency power supply by a frequency converter. In this case, the power supply is relieved by switching to the emergency frequency power supply immediately after the power supply from the normal frequency power supply is cut off.

In the method for rescuing a different frequency power supply according to the present invention, power is always received from the normal frequency power supply, and the emergency frequency power supply is not received, and is synchronized with the normal frequency power supply by the frequency conversion device. With this configuration, when it becomes impossible to supply power from the commercial frequency power supply, there is no need to perform synchronous control of the frequency conversion device again, and the power supply can be quickly rescued by the output of the frequency conversion device.

According to an eighth aspect of the present invention, a power receiving circuit for receiving power from a plurality of power supply systems having different frequencies has a forward converter corresponding to each power supply system, and the forward converter converts AC into DC. In power receiving equipment that can switch the output DC circuit, when the power supply from the commercial frequency power supply is cut off, immediately switch to the DC circuit side that received the power from the emergency frequency power supply, and apply the appropriate DC by the inverter. It converts the voltage to alternating current and saves the power.

In the method for rescuing a different frequency power supply according to the invention according to claim 8, both the normal frequency power supply and the emergency frequency power supply have forward converters, and the power supply system is used in the circuit after DC conversion. , And the direct current is converted to an appropriate voltage frequency by the inverter, so that it is possible to perform power supply rescue by switching to power reception from the commercial frequency power supply. Further, in the present system, the switching between the normal frequency power supply and the emergency frequency power supply is performed by the DC circuit, so that it is not necessary to synchronously control the frequency conversion device again, and the power supply can be promptly rescued.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration example of an embodiment according to the present invention. In FIG.
1 is an ordinary frequency power supply connected to a bus 6 in a switchboard via an AC circuit breaker 3a, 2 is an emergency frequency power supply, and this emergency frequency power supply 2 is an AC circuit breaker 3b, a transformer 4a,
The frequency converter 5, the transformer 4b and the AC circuit breaker 3c are connected to the bus 6 in series.

The bus 6 is connected to a plurality of load systems for supplying power to a load (not shown). In the power supply equipment having such a configuration, during normal operation, the AC circuit breaker 3
All of a, 3b, and 3c are closed, and the emergency frequency power supply 2 is operated in parallel with the normal frequency power supply 1.
Therefore, the frequency conversion device 5 operates to convert the frequency of the emergency frequency power supply 2 at a frequency synchronized with the normal frequency power supply 1.

In such a state, if an accident or the like occurs in the commercial frequency power supply 1 and power supply becomes impossible,
When the AC circuit breaker 3a is opened, the frequency converter 5
, The power corresponding to the load is continuously supplied to the bus 6 in the switchboard.

Therefore, even if the ordinary frequency power supply 1 is disconnected from the bus 6, even if the special frequency converter 5 is not synchronized again, it is possible to quickly switch to the emergency frequency power supply 2 and supply power. it can.

FIG. 2 is a circuit diagram showing a configuration example of an embodiment according to the present invention. In FIG. 2, a commercial frequency power supply 1 is connected to a bus 6 in a switchboard via an AC circuit breaker 3a, and an emergency frequency power supply 2 is connected in series to an AC circuit breaker 3c, a transformer 4 and an AC circuit breaker 3b. Connected to the bus 6 in the switchboard. A plurality of load systems for supplying power to a load (not shown) are connected to the bus 6.

Here, the transformer 4 is transformed by a magnitude obtained by multiplying the emergency frequency power supply voltage V2 by the frequency ratio F2 / F1 with respect to the normal frequency power supply voltage V1, and power is supplied to the load under a constant V / F condition. It is selected so that it can be done.

In the power supply system having such a configuration, during normal operation, the AC circuit breaker 3a is closed and the AC circuit breaker 3a is closed.
Circuits b and 3c are open. Therefore, power is supplied from the commercial frequency power supply 1 to the bus 6 to which the load system is connected.

In such a state, if an accident or the like occurs in the ordinary frequency power supply 1 and power supply becomes impossible,
When the AC circuit breaker 3a is opened, the AC circuit breaker 3
By closing the circuits b and 3c, the power which is transformed by the transformer 4 from the emergency frequency power supply 2 and which matches the load in the station is continuously supplied through the bus 6 in the switchboard under a constant V / F condition. .

Therefore, although the auxiliary equipment is affected by the frequency change before and after the power supply is switched, the frequency converter is not required to perform the power supply support from the different frequency power supply system.
Simplification of equipment and reduction of installation space can be expected.

FIG. 3 is a circuit diagram showing a configuration example of an embodiment according to the third aspect of the present invention. In FIG. 3, a common frequency power supply 1 is connected to a type of connection load in a switchboard via an AC circuit breaker 3a, a transformer 4c having two secondary windings, and an AC circuit breaker 3b corresponding to each winding. 2
The buses 6a1 and 6a2, which are divided into two, are connected to each other via an AC circuit breaker 3b.

Here, a transformer group is connected to one bus 6a via an AC circuit breaker 3e as a load, and an auxiliary machine group such as a motor is connected to the other bus 6a via an AC circuit breaker 3e as a load. It is connected.

On the other hand, the emergency frequency power supply 2 is connected via a transformer 4d having two secondary windings and an AC circuit breaker 3c corresponding to each winding to two buses 6b in a switchboard different from the above.
1, 6b2.

A bus 6a1 in the switchboard on the service frequency power supply side and a bus 6b1 in the switchboard on the emergency frequency power supply side
Is connected via an AC circuit breaker 3e, and the AC circuit breaker 3 is connected to the bus 6b2 in the switchboard on the emergency frequency power supply side.
e, the transformer 4a, the frequency converter 5, the transformer 4b
Are connected in series, and further connected to the bus 6b2 in the switchboard on the side of the ordinary frequency power supply via an AC circuit breaker 3e.

In the power supply system having such a configuration, during normal operation, the AC circuit breaker 3e is open, the emergency frequency power supply 2 supplies power to the buses 6b1 and 6b2 in the switchboard, and the frequency converter 5 This electric power is received from the bus 6b2, converted into a normal frequency, and stands by.

In such a state, when an accident or the like occurs in the service frequency power supply 1 and power supply becomes impossible, the AC circuit breakers 3a and 3b are opened and the AC circuit breaker 3e is closed. The transformer group is supplied with power from the emergency power supply 2 which is not affected by frequency from the bus 6b in the switchboard. Therefore, the group of important accessories is the frequency conversion transformer 4a,
4b and the frequency converter 5 can supply electric power of a common frequency.

Further, the frequency converter 5 performs the low-voltage switching, whereby the switching can be performed without synchronizing with the frequency of the commercial frequency power supply 1. As described above, according to the present embodiment, it is expected that the installed capacity of the transformers 4a and 4b and the frequency converter 5 is significantly reduced and the installation space is reduced.

FIG. 4 is a circuit diagram showing a configuration example of an embodiment according to the fourth aspect of the present invention. As shown in FIG. 4, a bus 6a in a switchboard is connected to a service frequency power supply 1 via an AC circuit breaker 3a, and the AC circuit breaker 3 is connected to the bus 6a.
The load 7a is connected via c and 3d, respectively.

A bus 6b in the switchboard is connected to the emergency frequency power supply 2 via an AC circuit breaker 3b, and a load 7b is connected to the bus 6b via circuit breakers 3e and 3f.

In the power supply system having such a configuration, the facility side of the emergency frequency power supply 2 is a backup facility for the electrical equipment of the regular frequency power supply 1, and the load of the regular frequency power supply 1 is set to 7a during normal operation. If an accident or the like occurs on the side of the regular frequency power supply 1 and power supply becomes impossible,
Load 7 on the emergency frequency power supply 2 side on the emergency frequency power supply 2 side
b, and the heavy load for backup driven by the auxiliary machine or the like can be continuously operated.

According to such an embodiment, a frequency converter is not required, and the number of facilities on the emergency frequency power supply 2 side can be reduced by limiting the important load for backup.

FIG. 5 is a circuit diagram showing a configuration example of an embodiment of the invention corresponding to claim 5. As shown in FIG. 5, a communication bus 8 is connected to the utility frequency power supply 1 via an AC circuit breaker 3a.
And a plurality of transformers 4c and an AC circuit breaker 3b are connected in series to the connecting bus 8 in a bus 6 in the switchboard.
Connect to a. Each bus 6a is connected to a load 7a.

The bus 6b in the switchboard is connected to the emergency frequency power supply 2 via the transformer 4a, the frequency converter 5, the transformer 4b and the AC circuit breaker 3c in series.
The load 7b is connected to b.

The AC buss 3d and 3e are interconnected between the communication bus 8 on the regular frequency power supply 1 side and the bus 6b on the emergency frequency power supply 2 side.

In the power supply system having such a configuration, during normal operation, the AC circuit breakers 3d and 3e are in an open circuit state, and the working frequency power supply 1 is connected to the AC circuit breaker 3a, the transformer 4c, and the bus via the AC circuit breaker 6a. Power is supplied from the load 6a to the load 7a. Further, after converting the frequency from the emergency frequency power supply 2 to the same frequency as that of the normal frequency power supply 1 by the transformers 4a and 4b and the frequency converter 5, power is supplied only from the bus 6b in the switchboard to the load 7b.

In such a state, if an accident or the like occurs in the service frequency power supply 1 and power supply becomes impossible, the AC circuit breaker 3a opens and the AC circuit breakers 3d and 3e are closed, thereby causing an emergency. Electric power is supplied from the utility frequency power supply 2 to the load 7a of the service frequency power supply 1.

Therefore, since it is not necessary to newly control the frequency converter 5 synchronously, it is possible to quickly switch the in-house power supply. FIG. 6 is a circuit diagram showing another example of the fifth embodiment. Here, only points different from FIG. 5 will be described.

In FIG. 6, the connecting bus 8 on the side of the regular frequency power supply 1 and the bus 6c in the switchboard corresponding to the important load 7c
Are connected in series with the transformer 4c and the AC circuit breaker 3g, and between each side between the electric circuit connecting the bus 6c and the AC circuit breaker 3f and the bus 6b in the switchboard on the emergency frequency power supply 2 side. AC circuit breakers 3f and 3d are provided and interconnected. In this case, a limited load to be backed up is selected as the important load 7c.

In the power supply system having such a configuration, when an accident or the like occurs on the side of the service frequency power supply 1, the AC circuit breakers 3d and 3f are closed to provide an important load to be backed up from the bus 6c in the switchboard. Can be supplied with power.

With such a configuration, it is expected that the installed capacity of the transformers 4a and 4b for the converter and the frequency converter 5 can be greatly reduced and the installation space can be reduced. FIG. 7 is a circuit diagram showing a configuration example of the embodiment of the invention corresponding to claim 6.

As shown in FIG. 7, the input terminal of the frequency converter 5 is connected to the commercial frequency power supply 1 by an AC circuit breaker 3a and a transformer 4
a, and an AC circuit breaker 3b and a transformer 4b are connected in series to the emergency frequency power supply 2,
The output terminal of the frequency converter 5 is connected to a bus 6 in a switchboard to which a load 7 is connected via a transformer 4c.

In the power supply equipment having such a configuration, when power is normally input from the working frequency power supply 1 to the frequency converter 5 via the AC circuit breaker 3a and the transformer 4a, the frequency converter 5 And the power is supplied to the bus 6 and the power is supplied to the load 7.

In such a state, if an accident or the like occurs on the service frequency power supply 1 side, the AC circuit breaker 3a opens and the AC circuit breaker 3b closes. Then, the frequency converter 5 changes the power input from the emergency frequency power supply 2 through the AC circuit breaker 3b and the transformer 4b to the same frequency as the normal frequency, and then changes the power via the bus 6. Power is supplied to the important load 7.

Accordingly, when the service power source 1 fails, the auxiliary equipment can be continuously operated by switching to the emergency power source 2 and performing frequency correction by the frequency converter 5.

FIG. 8 is a circuit diagram showing a configuration example of an embodiment of the invention corresponding to claim 7. As shown in FIG. 8, AC power is supplied from the utility frequency power supply 1 to the bus 6 in the switchboard via the AC circuit breaker 3a.
Supplies AC power through the AC circuit breaker 3b, the transformer 3b, the frequency converter 5, the transformer 4b, and the AC circuit breaker 3c in series, and detects from the instrument transformer 9 connected to the bus 6. The output of the frequency converter 5 is synchronized with the service frequency power supply 1 by a signal. A load 7 is connected to the bus 6 in the switchboard.

In the power supply equipment having such a configuration, during normal operation, the AC circuit breakers 3a and 3b are closed, and the AC circuit breaker 3c is open. Therefore, the bus 6 in the switchboard receives the service frequency power supply 1, and the consumption frequency power supply 2 does not receive power, and the output of the frequency converter 5 is synchronized with the service frequency power supply 1 by the detection signal of the instrument transformer 9. .

In this state, if an accident or the like occurs in the service frequency power supply 1 and power supply becomes impossible, the AC circuit breaker 3a is opened and the AC circuit breaker 3 is opened.
Close c. Thus, the bus 6 in the switchboard can be continuously supplied with power from the emergency frequency power supply 2.

Further, since there is no need to newly perform synchronous control of the frequency conversion device 5, it is possible to quickly switch the in-house power supply. FIG. 9 is a circuit diagram showing a configuration example of the embodiment of the invention corresponding to claim 8.

As shown in FIG. 9, a forward converter 10a for receiving power from a commercial frequency power supply 1 via a transformer 4a and converting it to DC and a DC switch 11a are provided in series in a frequency converter 5. , A forward converter 10 which receives electric power from the emergency frequency power supply 2 via the transformer 4b and converts the electric power into DC.
b and a DC switch 11b are provided in series, and an inverter 12 for converting DC input from the DC switches 11a and 11b into AC is provided, and AC power output from the inverter 12 is provided. Is supplied to a bus 6 in a switchboard via a transformer 4c and an AC circuit breaker 3 in series, and this is supplied to a load 7.

In the power supply equipment having such a configuration, when AC power is input from the commercial frequency power supply 1 to the forward converter 10a via the transformer 4a, the forward converter 10a converts the AC power into DC. I have. On the other hand, the emergency frequency power source 2
When AC power is input to the forward converter 10b via the transformer 4b, the forward converter 10b converts the AC power into DC.

When the DC output from the forward converters 10a and 10b is input to the inverter 12 through the DC switch 11a or 11b, the inverter 12 converts the DC into AC power having an appropriate frequency. Output.

During normal operation, the DC switch 11a is closed,
Assuming that the DC switch 11b is open, the bus 6 in the switchboard is receiving the commercial frequency power supply 1. In such a state, if power supply becomes impossible due to an accident or the like on the service frequency power supply 1 side, the DC switch 11a is opened and the DC switch 11b is closed, and the forward conversion on the emergency frequency power supply side is performed. The DC output from the switch 10a is converted into AC by the inverter 12 and supplied to the bus 6 via the transformer 4c and the AC circuit breaker 3.

Therefore, according to such a configuration, the switching between the normal frequency power supply 1 and the emergency frequency power supply 2 is performed by the DC circuit, so that it is not necessary to synchronize the frequency converter 5 between the two power supplies, and it is possible to quickly perform the operation. The power supply can be switched.

[0063]

As described above, according to the present invention, synchronized AC power can be quickly supplied to a load without causing a power failure when switching from a normal frequency power supply to an emergency frequency power supply. A different frequency power supply rescue method that can be provided can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a power supply facility showing a first embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 2 is a circuit configuration diagram of a power supply facility according to a second embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 3 is a circuit configuration diagram of a power supply facility according to a third embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 4 is a circuit configuration diagram of a power supply facility showing a fourth embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 5 is a circuit configuration diagram of a power supply facility according to a fifth embodiment for explaining a different-frequency power supply rescue method according to the present invention.

FIG. 6 is a circuit configuration diagram showing another example of the fifth embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of a power supply facility according to a sixth embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 8 is a circuit configuration diagram of a power supply facility according to a seventh embodiment for explaining a different frequency power supply rescue method according to the present invention.

FIG. 9 is a circuit configuration diagram of power supply equipment according to an eighth embodiment for explaining a different frequency power supply rescue method according to the present invention.

[Explanation of symbols]

Reference Signs List 1 ... Common frequency power supply 2 ... Emergency frequency power supply 3,3a-3f ... AC breaker 4,4a-4d ... Transformer 5 ... Frequency converter 6,6a-6c, 6a1,6a2,6b1, 6b2 ...
Bus 7, 7, 7a to 7c Load 8 Contact bus 9 Instrument transformer 10a, 10b Forward converter 11a, 11b DC switch 12 Inverter

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazushi Hosaka 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Shinichi Yamamoto 1-1-1, Shibaura, Minato-ku, Tokyo Stock (72) Inventor Tatsumi Uehara 1-1-1 Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office

Claims (8)

[Claims] In a power supply facility configured to receive power from a plurality of power supply systems having different frequencies through a single bus, the power supply always receives a normal frequency power and converts the emergency frequency power to a predetermined frequency by a frequency converter. Receiving power, operating the normal and emergency frequency power supplies in parallel, and immediately rescuing power from the emergency frequency power supply via the frequency conversion device as soon as power supply from the normal frequency power supply is cut off. Different frequency power rescue method. 2. In a power supply facility receiving power from a plurality of power supply systems having different frequencies, when power supply from a normal frequency power supply is cut off, when switching to power reception from an emergency frequency power supply, power reception of the emergency frequency power supply is performed. A method for relieving a different frequency power supply, comprising transforming a voltage to receive power and continuing operation at an emergency frequency. 3. In a power supply facility receiving power from a plurality of power supply systems having different frequencies, a load is divided into a power transformer and an important auxiliary machine to receive power from the common frequency power supply and receive power from the common frequency power supply. As soon as the power transformer is disconnected, the power transformer directly supplies the emergency frequency power without converting the frequency, and the important auxiliary machine supplies power from the emergency frequency power via a frequency converter. Different frequency power rescue method. 4. In a power supply facility comprising a plurality of buses receiving power from a plurality of power supply systems having different frequencies, the bus receiving power of the service frequency supplies power to a load for service frequency and supplies power to the load for emergency frequency. The receiving bus has a backup load for the emergency frequency, and always operates the electrical equipment for the regular frequency with the backup equipment for the emergency frequency stopped, and the power supply from the regular frequency power supply is cut off. A different frequency power supply rescue method, comprising: immediately supplying power from the emergency frequency power supply to the backup equipment for the emergency frequency. 5. A power supply system comprising a plurality of buses receiving power from a plurality of power supply systems having different frequencies, a bus directly receiving a service frequency power supply, and a bus receiving power from an emergency frequency frequency power supply via a frequency device. It is composed of a circuit that connects these buses, and always disconnects the bus communication circuit, receives the service frequency power supply and the emergency frequency power supply through the respective buses, and cuts off the power supply from the service frequency power supply. And supplying the power from the emergency frequency power supply immediately after turning on the bus communication circuit. 6. In a power supply system receiving power from a plurality of power supply systems having different frequencies, when the power reception system is switched, the frequency is converted to a predetermined frequency by a frequency conversion device and power is received. Receiving power
When the power supply from the service frequency power supply is cut off, the power receiving system is switched to the emergency frequency power supply system side, and the operation is continued by receiving power from the emergency frequency power supply via the frequency conversion device. And different frequency power supply rescue method. 7. A power supply system receiving power from a plurality of power supply systems having different frequencies, receiving a common frequency power supply, and setting an emergency frequency power supply in a standby state by constantly synchronizing with the common frequency power supply by a frequency converter, A different frequency power supply rescue method, comprising: immediately switching to power reception from the emergency frequency power supply and rescuing the power supply when power supply from the commercial frequency power supply is cut off. 8. A power receiving circuit that receives power from a plurality of power supply systems having different frequencies has a forward converter corresponding to each power supply system,
In a power receiving facility configured to be able to switch a DC circuit that is output by converting AC into DC by the forward converter, a DC circuit that receives power from the emergency frequency power supply immediately when power supply from the normal frequency power supply is cut off A different frequency power supply rescue method characterized in that the power is rescued by switching to a side and converting a direct current to an alternating current having an appropriate voltage frequency by an inverter.