JP2023180775A - Normal time standby device and power emergency interchange device - Google Patents

Abstract

To provide a normal time standby device and a power emergency interchange device that can be configured more simply and can detect a fault during standby.SOLUTION: The normal time standby device is designed to wait for executing an operation during a normal time and to perform a predetermined operation during an emergency. The normal time standby device includes an operation unit that performs the predetermined operation during the emergency and a control unit that controls the operation of the operation unit. The control device has a self-maintenance function that can automatically detect, during the standby, a malfunction of at least one of the operation unit and the control device that can only be detected when the operation unit is operating by executing simulated control of the operation of the control unit while it is on standby.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to an always-on standby device and an emergency power interchange device.

There is a constant standby device that is kept on standby at all times and operated only at necessary timing. For example, in the power field, there are emergency power interchange devices. The emergency power interchange device is a device that provides emergency power interchange from point B to point A when a disaster or the like occurs at point A and there is a power shortage.

An always-on standby device performs important duties only at the necessary pinpoint timing, but outside of those timings, it simply remains on standby. While the always-on-standby device is on standby, it is conceivable that the always-on-standby device may break down unnoticed due to deterioration of parts over time, deterioration of parts over time, or the influence of small animals or the local environment. In particular, abnormalities that can only be detected during operation are difficult to detect because they are not monitored. If the always-on-standby device reaches a time when it needs to operate in a faulty state, the always-on-standby device will not be able to fulfill its important responsibilities.

For example, an always-on standby device may have a monitoring function that detects abnormalities. However, the monitoring function detects abnormalities that occur during operation, and the monitoring function may also be stopped during standby. For this reason, it cannot be said to be a perfect measure.

There is also a method in which an inspector periodically conducts a simulated operation and inspects the equipment. However, with this method, it is necessary to stop the always-on standby device for several days to several weeks, which has a large impact on the operation of the always-on standby device. In addition, the amount of time and effort required by inspectors is large, and it is desired to reduce human work as much as possible.

Another method is to have a dual system of always-on-standby equipment, so that even if one system fails, the other system can fulfill its duties. However, since the duplex system increases the size of the entire device, there are concerns that the manufacturing cost of the device will increase and that it will be difficult to secure a local installation space.

For this reason, it is desired that the always-on-standby device has a simpler configuration so that failures can be discovered during standby.

Japanese Patent Application Publication No. 6-261457

Embodiments of the present invention provide an always-on standby device and an emergency power interchange device that have a simpler configuration and can detect failures during standby.

According to an embodiment of the present invention, the always-on standby device waits for execution of an operation during normal times and performs a predetermined operation during an emergency, the operating unit performing the predetermined operation during an emergency, and the operation of the operating unit. a control device for controlling the operation of the operation section, the control device controlling the operation of the operation section in a simulated manner during the standby period, thereby controlling the operation section and the control that can only be discovered when the operation section is operating. An always-on standby device is provided that has a self-maintenance function that allows a failure in at least one of the devices to be automatically discovered during the standby period.

Provided are a constant standby device and an emergency power interchange device that have a simpler configuration and can detect failures during standby.

FIG. 1 is a block diagram schematically representing an emergency power interchange device according to an embodiment. 1 is a flowchart schematically representing an example of the operation of the emergency power interchange device according to the embodiment. FIG. 3 is a block diagram schematically representing a modification of the emergency power interchange device according to the embodiment.

Each embodiment will be described below with reference to the drawings.
In the present specification and each figure, the same elements as those described above with respect to the existing figures are denoted by the same reference numerals, and detailed explanations are omitted as appropriate.

FIG. 1 is a block diagram schematically representing an emergency power interchange device according to an embodiment.
As shown in FIG. 1, the emergency power interchange device 10 (always on standby device) includes a power converter 12 (operating unit) and a gate pulse generator 14 (control device).

The power converter 12 is connected, for example, to the AC power system 2 via the switch 3 and to the DC circuit 4. Further, the power converter 12 is connected via the DC circuit 4 to a power converter of an emergency power interchange device of another power system.

The power converter 12 converts the AC power supplied from the power system 2 into DC power, and supplies the converted DC power to the DC circuit 4, thereby accommodating the power of the power system 2 to another power system. At the same time, the DC power supplied from the DC circuit 4 is converted to AC power, and the converted AC power is supplied to the power system 2, thereby accommodating the power of another power system to the power system 2. I do.

In this way, the power converter 12 performs an operation of accommodating the power of the power system 2 to another power system by converting power. For example, the power converter 12 may also be called a main circuit.

In this way, the emergency power interchange device 10 (power converter 12) performs power interchange between power systems. Power interchange is performed when, for example, a power shortage occurs in one of a pair of power systems due to the occurrence of a disaster. The emergency power accommodating device 10 stands by for power accommodating operations during normal times when there is no power shortage, and performs power accommodating operations in an emergency when a power shortage occurs. In other words, the emergency power interchange device 10 is in a standby mode in which the power interchange operation is stopped during normal times when there is no power shortage, and in an operation mode in which the power interchange operation is performed in an emergency when a power shortage occurs. becomes. The power converter 12 performs an operation of converting power to transfer power from one of the pair of power systems to the other power system in an emergency.

The emergency power interchange device 10 communicates with the host device 6, for example, and switches between a standby mode and an operation mode according to a control signal input from the host device 6. The emergency power interchange device 10 is an always-on standby device that is always on standby and operates only when a power shortage occurs. In other words, the power converter 12 is an operating unit that performs a predetermined operation in an emergency.

The power converter 12 is, for example, a separately excited converter using a separately excited switching element such as a thyristor. The power converter 12 has, for example, a plurality of separately excited switching elements, and performs power conversion by switching the plurality of separately excited switching elements.

For example, the switch 3 is open during normal times when there is no power shortage. Thereby, for example, it is possible to suppress the voltage from being applied to the plurality of switching elements of the power converter 12 during normal times. The switch 3 is turned on when a power shortage occurs in one of the pair of power systems and the emergency power interchange device 10 is operated. Switching between closing and opening of the switch 3 is controlled by the host device 6, for example. Note that the switch 3 may be a circuit breaker or the like. The switch 3 may have any configuration capable of switching between a state where the power converter 12 is connected to the power system 2 and a state where the power converter 12 is separated from the power system 2.

The gate pulse generator 14 controls the operation of power interchange by the power converter 12. For example, the gate pulse generator 14 transmits a gate pulse signal to each of the separately excited switching elements of the power converter 12, and controls the switching (on timing) of each switching element. The power conversion operation by the power converter 12 is controlled.

The gate pulse generator 14 includes, for example, a logic section 21, a pulse amplifier section 22, a control power supply unit 23, a failure indicator 24, a power failure compensation unit 25, and a relay unit 26.

The logic unit 21 communicates with the host device 6 and receives control signals from the host device 6 . The logic unit 21 generates a gate pulse signal for controlling the switching of each switching element of the power converter 12 based on the control signal input from the host device 6. The logic section 21 generates a gate pulse signal of an electric signal, and inputs the generated gate pulse signal to the pulse amplifier section 22 .

Further, the logic unit 21 monitors abnormalities in each part of the gate pulse generator 14 when the gate pulse generator 14 is in the operation mode. For example, when detecting an abnormality, the logic unit 21 outputs an abnormality signal representing the detected abnormality to the host device 6 or other external device 8. The external device 8 is, for example, a failure waveform recording device that automatically records various electric quantities and signals when an abnormality occurs from before the abnormality occurs until after recovery.

The pulse amplifier section 22 converts the gate pulse signal of the electric signal inputted from the logic section 21 into an optical signal, and inputs the gate pulse signal of the optical pulse to the power converter 12, thereby controlling each switching of the power converter 12. Controls the switching of each element.

The control power supply unit 23 receives power (AC power) from the power system 2 or another commercial power source, and uses the supplied power to the logic section 21, pulse amplifier section 22, fault indicator 24, relay unit 26, etc. Each part of the gate pulse generator 14 is operated by converting it into electric power corresponding to each part of the gate pulse generator 14 and supplying the converted power to each part.

The failure indicator 24 displays various abnormalities detected by the logic section 21. The failure indicator 24 is, for example, a display device such as a liquid crystal display. The failure indicator 24 displays various abnormalities by displaying characters, patterns, etc. The failure indicator 24 may display various abnormalities by, for example, turning on or blinking a light. The configuration of the failure indicator 24 may be any configuration that can appropriately display various abnormalities detected by the logic unit 21.

The power failure compensation unit 25 supplies power to the control power supply unit 23 when the power supplied to the control power supply unit 23 is lost. For example, the power failure compensation unit 25 compensates the control power of the control power supply unit 23 for a certain period of time until the emergency power interchange device 10 is stopped for protection when the power is lost (at the time of a power outage). The power outage compensation unit 25 is configured by, for example, a power storage element such as a storage battery or a capacitor.

For example, the relay unit 26 outputs an abnormality signal based on the abnormality detection result by the logic section 21. The relay unit 26 outputs an abnormality signal to the host device 6 or other external device 8, for example. Further, the relay unit 26 constructs a relay sequence at the time of starting and stopping, for example.

However, the configuration of the gate pulse generator 14 is not limited to the above, and may be any configuration that can control the power exchange operation by the power converter 12.

The gate pulse generator 14 has a self-maintenance function. The self-maintenance function is provided in the logic section 21, for example. In other words, the logic section 21 has a self-maintenance function.

The self-maintenance function automatically controls failures in the gate pulse generator 14 that can only be discovered when the power converter 12 is in operation by controlling the operation of the power converter 12 while it is on standby. This is a function to enable discovery. In other words, the self-maintenance function, when the emergency power interchange device 10 is in the standby mode, causes each part of the emergency power interchange device 10 to simulate operations similar to the operation mode of the emergency power interchange device 10, thereby reducing the power consumption. This function is for automatically discovering a failure that can only be discovered when the emergency power interchange device 10 is in the operation mode when the emergency power interchange device 10 is in the standby mode.

The self-maintenance function is realized by software, for example. The self-maintenance function is implemented in the logic unit 21 by incorporating software into the logic unit 21, for example. The self-maintenance function may be realized by hardware such as a programmable logic controller incorporating software, for example.

FIG. 2 is a flowchart schematically showing an example of the operation of the emergency power interchange device according to the embodiment.
FIG. 2 schematically represents an example of the operation of the self-maintenance function by the gate pulse generator 14 (logic unit 21). Further, FIG. 2 schematically represents an example of an operation in which the gate pulse generator 14 is operated in a simulated manner and a failure of the gate pulse generator 14 is discovered in the self-maintenance function.

As shown in FIG. 2, the logic unit 21 checks whether the gate pulse generator 14 (emergency power interchange device 10) is in the standby mode, and executes the self-maintenance function when in the standby mode (see FIG. Steps S101 and S102). For example, the logic unit 21 periodically executes a self-maintenance function while the gate pulse generator 14 is in standby mode.

When the logic unit 21 executes the self-maintenance function, it first confirms the basic operation of the gate pulse generator 14 that controls the operation of the power converter 12 in a simulated manner. The basic operation of the gate pulse generator 14 is, for example, an operation of outputting a gate pulse signal of an optical pulse from the pulse amplifier section 22 to the power converter 12.

Note that when the emergency power interchange device 10 is in standby mode, the switch 3 is opened and the supply of power to the power converter 12 is stopped. Therefore, even if the gate pulse signal is output to the power converter 12, it is possible to prevent the power converter 12 from operating and affecting the power system 2 and the like. In other words, the basic operation of the gate pulse generator 14 is similar to the operation mode.

For example, the logic section 21 inputs a gate pulse signal of an electric signal to the pulse amplifier section 22, and causes the pulse amplifier section 22 to output a gate pulse signal of an optical pulse corresponding to the input gate pulse signal of the electric signal. Then, the logic unit 21 detects the gate pulse signal of the optical pulse output from the pulse amplifier unit 22 using a light receiving element or the like, and obtains a detection result. In other words, the pulse amplifier section 22 has a detection circuit for detecting the output of the gate pulse signal, and inputs the detection result to the logic section 21 .

The logic unit 21 checks whether or not there is an abnormality in the gate pulse signal output from the pulse amplifier unit 22 based on the obtained detection result (step S103 in FIG. 2). Thereby, the logic unit 21 confirms the basic operation of the gate pulse generator 14 in a simulated manner. However, the method for checking the basic operation of the gate pulse generator 14 is not limited to the above method, and any method that can appropriately check the basic operation of the gate pulse generator 14 may be used.

When the logic unit 21 confirms that there is no abnormality in the gate pulse signal, it ends the self-maintenance function. In other words, when the logic unit 21 confirms that there is no abnormality in the basic operation of the gate pulse generator 14, it ends the self-maintenance function.

On the other hand, when the logic unit 21 confirms that there is an abnormality in the gate pulse signal, it notifies the higher-level device 6 of the abnormal state by transmitting an abnormality signal to the higher-level device 6, and also displays the failure indicator 24. By displaying the abnormal state, the abnormal state is notified to a local inspector or the like (steps S104 and S105 in FIG. 2). As a result, a failure of the gate pulse generator 14 that can only be discovered when the power converter 12 is operating (when the emergency power interchange device 10 is in the operating mode) can be detected during standby (when the emergency power interchange device 10 is in the standby mode). can be automatically discovered.

Furthermore, when the logic section 21 detects that some kind of abnormality has occurred in the gate pulse generator 14, the logic section 21 subsequently subdivides the self-maintenance function in order to precisely specify the failure location within the device. The logic section 21 divides the gate pulse generator 14 into a plurality of units, such as a unit or a board, and identifies a failure location by checking the operation of each of the units.

For example, when the logic unit 21 confirms that there is an abnormality in the gate pulse signal, it subsequently confirms the operation of the pulse amplifier unit 22 in a simulated manner (step S107 in FIG. 2).

When the logic unit 21 confirms that there is an abnormality in the pulse amplifier unit 22, the logic unit 21 transmits an abnormality signal related to the pulse amplifier unit 22 to the host device 6, thereby informing the host device 6 of the abnormal state of the pulse amplifier unit 22. At the same time, by displaying the abnormal state regarding the pulse amplifier section 22 on the failure indicator 24, the abnormal state of the pulse amplifier section 22 is notified to a local inspector or the like (steps S108 and S109 in FIG. 2).

When the logic section 21 confirms that there is an abnormality in the pulse amplifier section 22, it ends the self-maintenance function.

On the other hand, when the logic unit 21 confirms that there is no abnormality in the pulse amplifier unit 22, it subsequently confirms the operation of the relay unit 26 in a simulated manner (step S110 in FIG. 2). Hereinafter, similarly to the case of the pulse amplifier section 22, if an abnormality is confirmed, the abnormal state is notified, and if no abnormality is confirmed, the operation of the next unit is confirmed.

In this manner, when the logic unit 21 detects that some kind of abnormality has occurred in the gate pulse generator 14, the logic unit 21 identifies the location of the failure by sequentially checking the operation of each of a plurality of units. . The logic unit 21 also checks the operation of the logic unit 21 itself by checking the output of the logic unit 21, for example. In this way, once the failure location has been identified, the emergency power interchange device 10 can be easily repaired when the emergency power interchange device 10 is in standby mode or when a person goes to the site for regular inspection. It becomes possible.

As described above, in the emergency power interchange device 10 according to the present embodiment, a failure that can only be discovered in the operating mode can be automatically discovered in the standby mode. In other words, a failure that can only be discovered when the power converter 12 is in operation can be automatically discovered during standby. Thereby, for example, it is possible to prevent the emergency power interchange device 10 from being unable to fulfill its important duties due to a timing when operation is required in a faulty state.

Furthermore, in the emergency power interchange device 10, for example, it is possible to grasp the failure state of the device before going to the site, so it is possible to suppress failure investigation at the site. For example, on-site work can be limited to repair work only. In this way, it is possible to suppress the need for people to go to the site during periodic maintenance, and to significantly reduce human work.

Further, since the time required to execute the maintenance function is approximately several milliseconds to several seconds, the influence on the operation of the emergency power interchange device 10 can be reduced. For example, when an inspector performs a simulated operation and inspects the device, it is necessary to stop the emergency power interchange device 10 for several days to several weeks. In this way, it is possible to eliminate the need to stop the emergency power interchange device 10 for a long time for failure inspection.

Further, for example, if the self-maintenance function is realized by software, the self-maintenance function can be applied relatively easily to existing emergency power interchange devices. Furthermore, even when updating the entire gate pulse generator 14 (control device), it is possible to suppress an increase in the number of control panels, etc., and to suppress an increase in the installation area at the site. For example, it is possible to eliminate the need for additional construction work to secure an on-site installation location.

For example, if an emergency power interchange system is set up in a dual system, and one system fails, the other system may fulfill its duties. However, in this case, the duplex system increases the size of the entire device, so there are concerns that the manufacturing cost of the device will increase and that it will be difficult to secure a local installation space.

In the emergency power interchange device 10 according to the present embodiment, it is possible to suppress the increase in the size of the device, and it is also possible to suppress an increase in the manufacturing cost of the device and difficulty in securing a site for installation at the site.

In this manner, the emergency power interchange device 10 according to the present embodiment can detect failures during standby with a simpler configuration.

FIG. 3 is a block diagram schematically showing a modification of the emergency power interchange device according to the embodiment.
As shown in FIG. 3, the emergency power interchange device 10a further includes a simulated voltage generator 30 and a switch 32.

The simulated voltage generator 30 can supply power that simulates the power system 2 to the power converter 12. The simulated voltage generator 30 supplies, for example, AC power corresponding to the power system 2 to the power converter 12.

The switch 32 switches between a state in which power from the simulated voltage generator 30 is supplied to the power converter 12 and a state in which supply of power from the simulated voltage generator 30 to the power converter 12 is stopped. For example, when the switch 32 is in an open state in which the electric circuit is opened, the supply of electric power from the simulated voltage generator 30 to the power converter 12 is stopped, and in a closed state in which the electric circuit is closed, the switch 32 is in a state in which the supply of electric power from the simulated voltage generator 30 to the power converter 12 is stopped. A state is entered in which power is supplied to the power converter 12. The open state and closed state of the switch 32 are switched by the logic section 21, for example.

In the emergency power interchange device 10a, the logic unit 21 sets the power of the simulated voltage generator 30 to be supplied to the power converter 12 when executing the self-maintenance function, and in other states, the logic unit 21 supplies the power of the simulated voltage generator 30 to the power converter 12. The switch 32 is switched between an open state and a closed state so that the supply of power of 30 to the power converter 12 is stopped.

Thereby, in the self-maintenance function, the logic unit 21 confirms the basic operation of the gate pulse generator 14 in a simulated manner, and also uses the gate pulse signal from the gate pulse generator 14 and the electric power from the simulated voltage generator 30. By operating the power converter 12 based on the above, the basic operation of the power converter 12 is confirmed in a simulated manner. In the self-maintenance function, the logic unit 21 executes control of the operation of the power converter 12 in a simulated manner during standby, and also controls the power converter 12 and gate pulse generation by operating the power converter 12 in a simulated manner. To automatically discover a failure of a device 14 during standby.

At this time, by supplying power from the simulated voltage generator 30 to the power converter 12 and leaving the switch 3 open, even if the power converter 12 is operated, it will not affect the power system 2 etc. It is possible to prevent this from occurring. In the self-maintenance function, when operating the power converter 12 in a simulated manner, the logic unit 21 supplies power from the simulated voltage generator 30 to the power converter 12 in a state where the power converter 12 is disconnected from the power system 2. By supplying the power converter 12, the power converter 12 is operated in a simulated manner.

For example, the logic unit 21 detects the output of the power converter 12 and determines that there is no abnormality in the power converter 12 and the gate pulse generator 14 when appropriate power is output from the power converter 12, When appropriate power is not output from the power converter 12, it is determined that there is an abnormality in either the power converter 12 or the gate pulse generator 14. Thereby, the logic unit 21 confirms the basic operation of the power converter 12 and the gate pulse generator 14.

However, the method of checking the basic operations of the power converter 12 and the gate pulse generator 14 is not limited to the above. For example, the switching state (on state and off state) of each of the plurality of switching elements of the power converter 12 is checked, and if the switching state of each of the plurality of switching elements is appropriate, the power converter 12 and If it is determined that there is no abnormality in the gate pulse generator 14 and the switching state of each of the plurality of switching elements is inappropriate, it is determined that there is an abnormality in either the power converter 12 or the gate pulse generator 14. You may. The basic operation of the power converter 12 and the gate pulse generator 14 may be confirmed by any method that can appropriately confirm the basic operation of the power converter 12 and the gate pulse generator 14.

When the logic unit 21 detects that some kind of abnormality has occurred in the power converter 12 and the gate pulse generator 14, the logic unit 21 subsequently subdivides the self-maintenance function. The logic section 21 divides the power converter 12 and the gate pulse generator 14 into a plurality of units, such as a unit or a board, and identifies a failure location by checking the operation of each of the units.

In this way, in the emergency power interchange device 10a, the targets for which failure is detected by the self-maintenance function are not limited to the gate pulse generator 14, but the power converter 12 and the gate pulse generator 14, and 12 and the gate pulse generator 14 may be detected. Alternatively, only a failure of the power converter 12 may be detected. The self-maintenance function simulates control of the operation of the power converter 12 while it is on standby, so that the power converter 12 and the gate pulse generator 14 (control device), which can only be discovered when the power converter 12 is in operation, can be controlled. A function that allows at least one failure to be automatically discovered during standby may be sufficient.

In the above embodiment, the power converter 12 is a separately excited converter using a separately excited switching element such as a thyristor. The power converter 12 is not limited to a separately excited converter, and may be a self-excited converter using a self-excited switching element such as an IGBT (Insulated Gate Bipolar Transistor).

Further, in the embodiment described above, the gate pulse generator 14 is shown as an example of a control device that controls the operation of the power converter 12. For example, when the power converter 12 is a self-excited converter, the control device inputs a PWM signal as a control signal to the power converter 12, thereby controlling each switching element of the power converter 12. It may also be configured to control. The configuration of the control device may be any configuration that can appropriately control the operation of the power converter 12 by inputting a control signal to the power converter 12. The control signal input from the control device to the power converter 12 is not limited to an optical signal, and may be an electrical signal.

In the above embodiment, the emergency power interchange device 10 is shown as an example of a constant standby device. The constant standby device is not limited to this, and may be, for example, an uninterruptible power supply, a circuit breaker, or the like.

The uninterruptible power supply stands by to perform the power supply operation during normal times when no power outage occurs, and performs the power supply operation in an emergency when a power outage occurs. In the uninterruptible power supply, the operation unit is, for example, a power converter that converts power stored in a power storage unit into power according to a load and supplies the power.

A circuit breaker waits to perform an operation to interrupt the electrical circuit during normal times when no overcurrent occurs, and performs an operation to interrupt the electrical circuit in an emergency when an overcurrent occurs. In a circuit breaker, the operating section is, for example, a switch circuit that opens and closes an electric circuit.

The always-on-standby device is not limited to the above, but may be any device that stands by to perform an operation during normal times and performs a predetermined operation in an emergency. The operating section may be any member that performs a predetermined operation in an emergency.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

2...Power system, 3...Switch, 4...DC circuit, 6...Upper device, 8...External device, 10, 10a...Emergency power interchange device (always on standby device), 12...Power converter, 14...Gate pulse generation Device (control device), 21...Logic section, 22...Pulse amplifier section, 23...Control power supply unit, 24...Failure indicator, 25...Power outage compensation unit, 26...Relay unit, 30...Simulated voltage generator, 32...Opening/closing vessel

Claims (6)

An always-on standby device that stands by to perform an action during normal times and performs a predetermined action in an emergency,
an operating section that performs the predetermined operation in the event of an emergency;
a control device that controls the operation of the operating section;
Equipped with
The control device simulates control of the operation of the operating unit during the standby period, thereby preventing a failure in at least one of the operating unit and the control device that can be discovered only when the operating unit is in operation. An always-on standby device with a self-maintenance function that automatically detects the inside of the device. In the self-maintenance function, the control device simulates a basic operation for controlling the operation of the operating section, and if it is confirmed that there is an abnormality in the basic operation, the control device controls the operating section and the control device. 2. The always-on standby device according to claim 1, wherein the failure location is identified by dividing the at least one of the plurality of units into a plurality of units and checking the operation of each of the plurality of units. Emergency power interchange that stands by for power interchange operation during normal times when there is no power shortage in a pair of power systems, and performs power interchange operation in an emergency when there is a power shortage in one of the pair of power systems. A device,
a power converter that operates to transfer power from one of the pair of power systems to the other of the pair of power systems by converting power in the emergency;
a control device that controls the operation of power accommodation by the power converter;
Equipped with
The control device simulates control of the operation of the power converter during the standby period, thereby preventing a failure in at least one of the power converter and the control device that can be discovered only when the power converter is in operation. , an emergency power interchange device having a self-maintenance function that enables automatic discovery during standby. In the self-maintenance function, the control device checks a basic operation for controlling the operation of the power converter in a simulated manner, and if it is confirmed that there is an abnormality in the basic operation, the control device 4. The emergency power interchange device according to claim 3, wherein the at least one of the control devices is divided into a plurality of units, and the failure location is identified by checking the operation of each of the plurality of units. In the self-maintenance function, the control device controls the operation of the power converter in a simulated manner during the standby period, and operates the power converter in a simulated manner. The emergency power interchange device according to claim 3 or 4, wherein a failure of the control device can be automatically discovered during the standby. further comprising a simulating voltage generator capable of supplying power simulating the power system to the power converter,
In the self-maintenance function, when the power converter is operated in a simulated manner, the control device is configured to generate a voltage from the simulated voltage generator to the power converter in a state where the power converter is disconnected from the power system. The emergency power interchange device according to claim 5, wherein the power converter is operated in a simulated manner by supplying electric power.

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