JP2020068636A - Power supply system, power supply device and power supply method - Google Patents

Abstract

To provide a power supply system, a power supply device and a power supply method capable of supplying or stopping a DC power with safety.SOLUTION: A power supply system Z1 comprises: a DC power line side terminal part 201 supplied with a power from a DC power line 101; a power supply side terminal part 21 supplied with a DC power from the DC power line side terminal part 201; a connector 11 that holds or releases connection between the DC power line side terminal part 201 and the power supply side terminal part 21; a power conversion device 51 that converts the DC power from the power supply side terminal part 21 and supplies a power to a power load 401; a first opening/closing unit 41 connected between the power conversion device 51 and the power supply side terminal part 21 and that supplies or stops the DC power; a first controller 61 that monitors a connection state of the power supply side terminal part 21, an opening state of the first opening/closing unit 41 and a power supply state of the power conversion device 51 to perform removal control; and a command transmission unit 301 that transmits a removal command to the first controller 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system, a power supply device, and a power supply method.

  The installation of power generators using internal combustion engines (hereinafter, internal combustion engine power generators) is expanding for purposes such as power compensation equipment for the stable supply of renewable energy and in-house power generation equipment in emergencies. Furthermore, for the purpose of supplying power to a controlled area, it is expected that the need for direct current (DC) power supply devices as well as alternating current (AC) power supply devices such as internal combustion engine power generators will increase.

  Patent Document 1 discloses that "a first DC load that is charged by a power converter that converts AC power into DC power and that is supplied with DC power from the power converter is always connected in parallel to the power converter. A first power storage capable of supplying a minimum amount of DC power for backup to the first DC load when the AC power supplied to the device momentarily drops in voltage or stops instantaneously. Device and the first power storage device and the first DC load that are charged by the power conversion device and can be connected in parallel to the first power storage device and the first DC load. A DC power supply system including a second power storage device which can be supplied to a load and has a capacity larger than that of the first power storage device ". The DC power supply system described in Patent Document 1 includes a "first switch provided in a circuit connecting the power conversion device and the second power storage device, the second power storage device, and the second DC power supply". A second switch provided in a circuit that connects a load, a power failure detection unit that detects a stop of supply of the AC power to the power conversion device, and a DC power stored in the second power storage device When supplying the second DC load, the first switch is turned off and the second switch is turned on, and the power failure detection means detects the supply stop of the AC power to the power conversion device. In this case, circuit switching means for preferentially turning on the first switch and turning off the second switch ”.

WO2010 / 082506

  However, in the DC power supply system described in Patent Document 1, the first switch and the second switch need to have a function of cutting off DC power, but a specific configuration or control method is not specified, and DC There was a possibility that the power could not be cut off safely.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply system, a power supply device, and a power supply method capable of safely supplying or stopping DC power.

  In order to solve the above problems, a power supply system according to the present invention includes a DC power line side terminal unit to which power is supplied from a DC power line and a power supply to which DC power is supplied from the DC power line side terminal unit. Side terminal section, a connecting section for fixing or releasing the connection between the DC power line side terminal section and the power supply side terminal section, and DC power from the power supply side terminal section is converted into electric power to supply electric power to the electric power load. A power converter that supplies power, a first opening / closing unit that is connected between the power converter and the power supply side terminal unit to supply or stop DC power, a connection state of the power supply side terminal unit, and The first control unit monitors the open state of the first opening / closing unit and the power supply state of the power conversion device to perform removal control, and the first control unit includes the DC power line side terminal unit and the terminal unit. Power supply side terminal When a command to release is input, the power supply of the power converter is stopped, the first opening / closing unit is opened after the power converter is stopped, and the power supply is supplied after the first opening / closing unit is opened. It is characterized in that the connection of the side terminal portion is released.

  According to the present invention, it is possible to provide a power supply system, a power supply device, and a power supply method that can safely supply or stop DC power.

It is a figure which shows the structure of the electric power supply system which concerns on the 1st Embodiment of this invention. 6 is a flowchart showing a power supply operation of a first control unit of the power supply device of the power supply system according to the first embodiment. It is a figure which shows the structure of the electric power supply system which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the electric power supply operation of the 1st control part of the electric power supply system which concerns on the said 2nd Embodiment. It is a figure which shows the structure of the electric power supply system which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the electric power supply operation of the 1st control part and 2nd control part of the electric power supply system which concerns on the said 3rd Embodiment. It is a figure which shows the structure of the electric power supply system which concerns on the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a configuration of a power supply system Z1 according to the first embodiment of the present invention. In each drawing, the same reference numerals indicate the same constituent elements or constituent elements having similar functions.

[Power supply system Z1]
As illustrated in FIG. 1, the power supply system Z1 includes a DC power line side terminal unit 201 connected to the DC power line 101, a power supply device Y1 connected to the DC power line side terminal unit 201, and a power supply device. A command transmission unit 301 that transmits a removal command to Y1 and supplies electric power to an electric power load 401 connected to the electric power supply device Y1. To do. The power load 401 is AC power, DC power, or both.

[Power supply device Y1]
The power supply device Y1 includes a power supply side terminal part 21 connected to the DC power line side terminal part 201, and a connection part 11 for fixing or releasing the connection between the DC power line side terminal part 201 and the power supply side terminal part 21. , A first opening / closing unit 41 connected to the power supply side terminal unit 21 for supplying or stopping DC power of the DC power line 101, and a DC load connected to the first opening / closing unit 41 to convert power into a power load 401. The power converter 51 for supplying power, the DC power line side terminal unit 201, the first opening / closing unit 41, and the power converter 51 are monitored for connection states and power supply states, and a first control unit for removing and controlling each. 61 is provided.
The first opening / closing unit 41 is configured by a semiconductor device such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) as a switching element or an electromagnetic contactor such as a magnet switch. Further, the power conversion device 51 converts the DC power of the DC power line 101 into AC power, DC power, or both in accordance with the power load 401.

[First control unit 61]
The first control unit 61 is configured by a CPU and the like, and includes a time controller 62. The time controller 62 is a control device that switches the output signal at a preset time after the start signal (open command) is input. The first control unit 61 uses the time controller 62 to input the power of the power conversion device 51 when a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input from the command transmission unit 301. The power supply to the load 401 is stopped, the first opening / closing part 41 is opened after the power converter 51 is stopped, and the connection of the connection part 11 is released after the first opening / closing part 41 is opened.

Hereinafter, the operation of the power supply system Z1 configured as described above will be described.
FIG. 2 is a flowchart showing the power supply operation of the first controller 61 of the power supply device Y1 of the power supply system Z1.
In step S1, the first control unit 61 stops the power conversion device 51 when the command transmission unit 301 inputs a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21. Specifically, when a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input from the command transmission unit 301, the first control unit 61 uses the time controller 62 to convert the power. A signal for stopping the device 51 is sent to the power conversion device 51. After receiving the stop signal, the power conversion device 51 shifts to the stop operation.

  In step S2, the first control unit 61 determines whether or not the power supply status of the power conversion device 51 is the stopped state. Specifically, the first control unit 61 uses the time controller 62 to check the power supply status of the power conversion device 51 after a time sufficient for stopping the power conversion device 51 has elapsed.

  When the power supply status of the power converter 51 is in the stopped state (step S2: Yes), the first opening / closing part 41 is opened in step S3, and the process proceeds to step S4. When the power supply status of the power converter 51 is not in the stopped state (step S2: No), the process proceeds to step S8.

  In step S4, the first control unit 61 determines whether the first opening / closing unit 41 is open. Specifically, in step S3, the first control unit 61 sends a signal for opening the first opening / closing unit 41 to the first opening / closing unit 41. After receiving the opening signal, the first opening / closing unit 41 shifts to the opening operation. In step S4, the first controller 61 uses the time controller 62 to check the open state of the opening / closing section 21 after a time sufficient for opening the first opening / closing section 41 has elapsed.

  When the open status of the first opening / closing part 41 is open (step S4: Yes), the connection part 11 is released in step S5, and the process proceeds to step S6. That is, in step S5, the first control unit 61 sends a signal to the connection unit 11 to release the connection unit 11. After receiving the release signal, the connection unit 11 shifts to the release operation. On the other hand, when the open state of the first opening / closing unit 41 is not open (step S4: No), the process proceeds to step S8.

  In step S6, the first control unit 61 determines the release status of the connection unit 11. Specifically, the first control unit 61 uses the time controller 62 to confirm the release status of the connection unit 11 after a sufficient time for the connection unit 11 to release.

  When the release status of the connection unit 11 is release (step S6: Yes), the first control unit 61 transmits the information of “removal OK” to the command transmission unit 301 in step S7.

  On the other hand, when the power supply status of the power converter 51 is not in the stopped state in step S2 (step S2: No), the open status of the first opening / closing part 41 is not open in step S4 (step S4: No), or When the release status of the connecting portion 11 is not released in step S6 (step S6: No), the process proceeds to step S8, the control flow is stopped in step S8, and the information of "removal NG" is transmitted to the command transmitting portion 301. A discharge circuit (not shown) is mounted on the power converter 51, and after the first opening / closing portion 41 is opened, the power in the power converter 51 is discharged by the discharge circuit (not shown).

  As described above, in the power supply system Z1 according to the present embodiment, the DC power line side terminal unit 201 to which power is supplied from the DC power line 101 and the DC power from the DC power line side terminal unit 201 are supplied. The power supply side terminal part 21, the connection part 11 for fixing or releasing the connection between the DC power line side terminal part 201 and the power supply side terminal part 21, and the DC power from the power supply side terminal part 21 are converted into electric power, A power conversion device 51 that supplies power to the power load 401, a first opening / closing part 41 that is connected between the power conversion device 51 and the power supply side terminal part 21 to supply or stop DC power, and a power supply side terminal part. 21, a first control unit 61 that monitors the connection state of the first opening / closing unit 41, an open state of the first opening / closing unit 41, and a power supply state of the power conversion device 51 to perform removal control, and transmits a removal command to the first control unit 61. Includes a command transmitting section 301 that, a.

  The 1st control part 61 stops the power supply of the power converter device 51, when the instruction | command which opens the DC power line side terminal part 201 and the power supply side terminal part 21 is input, and after stopping the power converter device 51. The first opening / closing portion 41 is opened, and the connection of the power supply side terminal portion 21 is released after the first opening / closing portion 41 is opened.

  With this configuration, the connection of the power supply side terminal portion 21 is released after the first opening / closing portion 41 is opened, so that the DC power can be safely cut off in the state where the power is not supplied. For example, the user can manually operate the connection unit 11 to disconnect the DC power line side terminal unit 201 and the power supply side terminal unit 21.

(Second embodiment)
FIG. 3 is a diagram showing a configuration of a power supply system Z2 according to the second embodiment of the present invention. The same components as those in FIG. 1 are designated by the same reference numerals and the description of the duplicated portions will be omitted.

[Power supply system Z2]
As shown in FIG. 3, the power supply system Z2 includes a DC power line side terminal unit 201 connected to the DC power line 101, a power supply device Y2 connected to the DC power line side terminal unit 201, and a power supply device. A command transmission unit 301 that transmits a removal command to Y2, and supplies power to a power load 401 connected to the power supply device Y2. The power load 401 is AC power, DC power, or both.

[Power supply device Y2]
The power supply device Y2 includes a power supply side terminal part 21 connected to the DC power line side terminal part 201, and a connection part 11 for fixing or releasing the connection between the DC power line side terminal part 201 and the power supply side terminal part 21. , A first current detection unit 31 connected to the power supply side terminal unit 21 to detect the amount of DC power of the DC power line 101, and a DC power supply of the DC power line 101 connected to the first current detection unit 31 or The 1st opening / closing part 41 which stops, the power converter 51 connected to the 1st opening / closing part 41, which converts the DC power into electric power and supplies the converted power to the electric power load 401, the power supply side terminal part 21, and the 1st opening / closing part. A first control unit 61A that monitors the connection state of 41 and the current state detected by the first current detection unit 31 and controls the power supply state of the power conversion device 51.

[First control unit 61A]
61 A of 1st control parts stop the power supply of the power converter device 51, when the instruction | command which opens the DC power line side terminal part 201 and the power supply side terminal part 21 is input from the command transmission part 301, power conversion. After the device 51 is stopped, it is confirmed that the current amount I _DC1 of the first current detector 31 is smaller than the predetermined first current value (current target value I _M1 ).

The first current value is a current target value I _M1 that does not generate an electric spark, that is, an arc, which is generated due to a current flowing in the circuit when the power conversion device 51 is stopped, and the most preferable one is , The first current value (current target value I _M1 ) is 0 (I _M1 = 0). Even if the power converter 51 is stopped, the current flowing through the circuit does not instantly become zero. In the present embodiment, when the measurement system determines that the current is 0 (when the value detected by the first current detection unit 31 is 0), the first control unit 61A issues a cutoff command to the command transmission unit 301.

Further, when the first current value (current target value I _M1 ) is 0, an instantaneous value may be used as I _M1 = 0, but resource reduction of the first control unit 61, erroneous detection, and the accompanying operation From the viewpoint of stability, the average value when the measurement system measures for a certain period of time (for example, when the power converter 51 switches once in one cycle as one cycle, the current detection value once every three cycles) Is set to I _M1 = 0.
Therefore, the time controller 62 measures the current value from the first current detection unit 31 in cooperation with the first current detection unit 31. The first control unit 61A uses the time controller 62 to notify the command transmission unit 301 when the average value becomes smaller than the target value I _M1 when the switching operation of the power conversion device 51 becomes n cycles. Issue a shutoff command.

The first control unit 61A opens the first opening / closing unit 41 after confirming that the current amount I _{DC1 of} the first current detecting unit 31 is smaller than the predetermined first current value I _M1, and opens the first opening / closing unit 41. After that, the connection of the connecting portion 11 is released.

Hereinafter, the operation of the power supply system Z2 configured as described above will be described.
FIG. 4 is a flowchart showing the power supply operation of the first controller 61A of the power supply device Y2 of the power supply system Z2. Steps that perform the same processing as in FIG. 2 are given the same step numbers.
In step S <b> 1, the first control unit 61 </ b> A stops the power conversion device 51 when the command transmission unit 301 inputs a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21. Specifically, when a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input from the command transmission unit 301, the first control unit 61A outputs a signal to stop the power conversion device 51. Send to the power converter 51. After receiving the stop signal, the power conversion device 51 shifts to the stop operation.

  In step S2, the first control unit 61A determines whether the power supply status of the power conversion device 51 is in the stopped state. Specifically, the first control unit 61A confirms the power supply status of the power conversion device 51 after a time sufficient for stopping the power conversion device 51 has elapsed. When the power supply status of the power converter 51 is not in the stopped state (step S2: No), the process proceeds to step S8.

When the power supply status of the power converter 51 is in the stopped state (step S2: Yes), the process proceeds to step S11. In step S11, the first control unit 61A detects the current amount of the first current detection unit 31. When the current amount of the first current detection unit 31 is I _DC1 and the current target value is I _M1 (first current value), the first control unit 61A satisfies I _DC1 <I _M1 (step S11: Yes). , And proceeds to step S3. If I _DC1 <I _M1 is not satisfied, the process proceeds to step S8.

When I _DC1 <I _M1 is satisfied (step S11: Yes), the first control unit 61A opens the first opening / closing unit 41 in step S3 and proceeds to step S4.

  In step S4, the first control unit 61A determines whether the first opening / closing unit 41 is open. Specifically, the first control unit 61A sends a signal for opening the first opening / closing unit 41 to the first opening / closing unit 41. After receiving the opening signal, the first opening / closing unit 41 shifts to the opening operation (step S3). After a time sufficient for opening the first opening / closing section 41 has elapsed, the opening state of the opening / closing section 21 is confirmed (step S4).

  When the open status of the first opening / closing part 41 is open (step S4: Yes), the connection part 11 is released in step S5, and the process proceeds to step S6. That is, the first control unit 61A sends a signal to the connection unit 11 to release the connection unit 11. After receiving the release signal, the connection unit 11 shifts to the release operation. On the other hand, when the open state of the first opening / closing unit 41 is not open (step S4: No), the process proceeds to step S8.

  In step S6, the first control unit 61A determines the release status of the connection unit 11. Specifically, the first control unit 61A confirms the release status of the connection unit 11 after a time sufficient for releasing the connection unit 11 has elapsed.

  When the release status of the connection unit 11 is release (step S6: Yes), the first control unit 61A transmits the information of “removal OK” to the command transmission unit 301 in step S7.

On the other hand, when the power supply status of the power converter 51 is not in the stopped state in step S2 (step S2: No), when I _DC1 < _IM1 (first current value) is not satisfied in step S11 (step S11: No) ), If the open status of the first opening / closing part 41 is not open in step S4 (step S4: No), or if the release status of the connection part 11 is not release in step S6 (step S6: No), the process proceeds to step S8. Then, in step S8, the control flow is stopped, and the information of "removal NG" is transmitted to the command transmission unit 301. A discharge circuit (not shown) is mounted on the power converter 51, and after the first opening / closing portion 41 is opened, the power in the power converter 51 is discharged by the discharge circuit (not shown).

As described above, the power supply device Y2 according to the present embodiment further includes the first current detection unit 31 that is connected between the power supply side terminal unit 21 and the power conversion device 51 and detects the amount of DC power current. When the command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input, the first control unit 61A detects the value of the first current detection unit 31 after the power conversion device 51 is stopped. However, when the value detected by the first current detection unit 31 is smaller than the predetermined first current value (current target value I _M1 ), the first opening / closing unit 41 is opened and the first opening / closing unit 41 is opened. After that, the connection of the power supply side terminal portion 21 is released. Current target value _{I M1} is the current target value _{I M1} as an arc is not generated, and most preferably from _{I M1} = 0.

  With this configuration, it is possible to confirm the state in which the power is not supplied by detecting the current, and it is possible to safely cut off the DC power.

(Third Embodiment)
FIG. 5: is a figure which shows the structure of the electric power supply system Z3 which concerns on the 3rd Embodiment of this invention. The same components as those in FIG. 3 are designated by the same reference numerals and the description of the duplicated portions will be omitted.

[Power supply system Z3]
As illustrated in FIG. 5, the power supply system Z3 includes a second opening / closing unit 221 connected to the DC power line 101, a second current detecting unit 211 connected to the second opening / closing unit 221 to detect a current, and a second current detecting unit 211. The DC power line side terminal unit 201 connected to the current detection unit 211, the power supply device Y3 connected to the DC power line side terminal unit 201, the open state of the second opening / closing unit 221 and the DC power line side terminal unit 201. The second control unit 231 that monitors the connection state of the power supply device Y3 and the second control unit 231 by monitoring the connection state of the second opening / closing unit 221 and the DC power line side terminal unit 201. And a power transmission unit 301, and supplies power to a power load 401 connected to the power supply device Y3. The power load 401 is AC power, DC power, or both.

[Power supply device Y3]
The power supply device Y3 has the same configuration as the power supply device Y2 shown in FIG. That is, the power supply device Y3 includes a power supply side terminal part 21 connected to the DC power line side terminal part 201 and a connection part for fixing or releasing the connection between the DC power line side terminal part 201 and the power supply side terminal part 21. 11, a first current detection unit 31 that is connected to the DC power line side terminal unit 201 and detects the amount of DC power of the DC power line 101, and a DC power of the DC power line 101 that is connected to the first current detection unit 31. A first switching unit 41 that supplies or stops the power, a power conversion device 51 that is connected to the first switching unit 41 and that converts the DC power into power and supplies the converted power to the power load 401, the power supply side terminal unit 21, and The first control unit 61A monitors the connection state of the first opening / closing unit 41, the current state detected by the first current detection unit 31, and controls the power supply state of the power conversion device 51.

[First control unit 61A]
61 A of 1st control parts stop the electric power supply of the power converter device 51, when the instruction | command which opens the DC power line side terminal part 201 and the electric power supply side terminal part 21 is input from the command transmission part 301. The first control unit 61A confirms that the current amount of the first current detection unit 31 is smaller than the predetermined first current value (current target value I _M1 ) after the power conversion device 51 is stopped, and the first current detection unit 31 operates. After confirming that the current amount is smaller than the predetermined first current value, the first opening / closing part 41 is opened.
The first control unit 61A also sends a signal to the connection unit 11 to disconnect the connection unit 11 after the second opening / closing unit 221 is opened.

[Second control unit 231]
The second control unit 231 detects the second current after opening the first opening / closing unit 41 when a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input from the command transmission unit 301. current amount _{I DC2} parts 211 to confirm that less than a predetermined second current value (current target value _{I M2),} the current amount _{I DC2} of the second current detection unit 211 is smaller than a predetermined second current value _{I M2} After checking, the second opening / closing part 221 is opened.

The second current value is, like the first current value, a current target value I _M2 at which an arc does not occur on the circuit on the DC power line side, and most preferably, the first current value (current Similarly to the target value I _M1 , the second current value (current target value I _M2 ) is 0 (I _M2 = 0).

Hereinafter, the operation of the power supply system Z3 configured as described above will be described.
FIG. 6 is a flowchart showing the power supply operation of the first control unit 61A and the second control unit 231 of the power supply device Y3 of the power supply system Z3. The same step numbers are assigned to the steps that perform the same processing as in FIG.

  In step S2, the first control unit 61A determines whether the power supply status of the power conversion device 51 is in the stopped state. Specifically, the first control unit 61A uses the time controller 62 to check the power supply status of the power conversion device 51 after a time sufficient for stopping the power conversion device 51 has elapsed. When the power supply status of the power converter 51 is not in the stopped state (step S2: No), the process proceeds to step S8.

When the power supply status of the power converter 51 is in the stopped state (step S2: Yes), the process proceeds to step S11. In step S11, the first control unit 61A detects the current amount of the first current detection unit 31. When the current amount of the first current detection unit 31 is I _DC1 and the current target value is I _M1 (first current value), when I _DC1 <I _M1 is satisfied, the process proceeds to step S3. If I _DC1 <I _M1 is not satisfied, the process proceeds to step S8.

When I _DC1 <I _M1 is satisfied (step S11: Yes), the first control unit 61A determines the open state of the first opening / closing unit 41 in step S4. Specifically, the first control unit 61A sends a signal for opening the first opening / closing unit 41 to the first opening / closing unit 41. After receiving the opening signal, the first opening / closing unit 41 shifts to the opening operation. The first control unit 61 uses the time controller 62 to check the open state of the opening / closing unit 21 after a time sufficient for opening the first opening / closing unit 41 has elapsed.

When the open state of the first opening / closing unit 41 is open (step S4: Yes), the process proceeds to the process of the second control unit 231, and in step S21, the second control unit 231 causes the current amount of the second current detection unit 211 to flow. Detect _IM2 . When the current amount of the current detection unit 221 is I _DC2 and the current target value is I _M2 (second current value), the second control unit 231 proceeds to step S22 when I _DC2 <I _M2 is satisfied.

When I _DC2 <I _M2 is satisfied (step S21: Yes), the second control unit 231 sends a signal to open the second opening / closing unit 221 to the second opening / closing unit 221 in step S22 to open the second opening / closing unit 221. Determine the situation. Specifically, the second control unit 231 sends a signal for opening the second opening / closing unit 221 to the second opening / closing unit 221, and the second opening / closing unit 221 shifts to an opening operation. After a time sufficient for opening the second opening / closing unit 221 has elapsed, the opening state of the second opening / closing unit 221 is confirmed.

  When the open state of the second opening / closing unit 221 is open (step S22: Yes), the process proceeds to the process of the first control unit 61A in step S6.

  In step S6, the first control unit 61A determines the release status of the connection unit 11. Specifically, the first control unit 61A uses the time controller 62 to confirm the release status of the connection unit 11 after a sufficient time for the connection unit 11 to release.

  When the release status of the connection unit 11 is release (step S6: Yes), the first control unit 61A transmits the information of “removal OK” to the command transmission unit 301 in step S7.

On the other hand, if the power supply status of the power conversion device 51 is not in the stopped state in step S2 (step S2: No), if I _DC1 <I _M1 is not satisfied in step S11 (step S11: No), then in step S4. If the opening status of the first opening / closing section 41 is not open (step S4: No), if I _DC2 < _IM2 is not satisfied in the step S21 (step S21: No), the second opening / closing section 221 is opened in the step S22. If the situation is not open (step S22: No), or if the release status of the connecting portion 11 is not release in step S6 (step S6: No), the process proceeds to step S8, the control flow is stopped in step S8, and the command transmission unit is executed. The information of “remove NG” is transmitted to 301. A discharge circuit (not shown) is mounted on the power converter 51, and after the first opening / closing portion 41 is opened, the power in the power converter 51 is discharged by the discharge circuit (not shown).

  As described above, the power supply system Z3 according to the present embodiment includes the power supply device Y3, the second opening / closing unit 221 connected to the DC power line 101, and the DC of the DC power line 101 connected to the second opening / closing unit 221. A second current detection unit 211 that detects the amount of electric current, a DC power line side terminal unit 201 connected to the second current detection unit 211, a connection state of the DC power line side terminal unit 201, and a second opening / closing unit. A second control unit 231 that monitors the open state of the 221 and performs removal control.

When the command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input, the first control unit 61A detects the value of the first current detection unit 31 after the power conversion device 51 is stopped. Then, when the value detected by the first current detection unit 31 is smaller than the first current value (current target value I _M1 ), the first opening / closing unit 41 is opened. The second control unit 231 detects the value of the second current detection unit 211 after the first opening / closing unit 41 is opened, and the value detected by the second current detection unit 211 is the second current value (current target value). When it is smaller than I _M2 ), the second opening / closing unit 221 is opened, and the DC power line side terminal unit 201 is disconnected after the second opening / closing unit 221 is opened.

  In the present embodiment, with respect to the power supply device Y3, the same effect as that of the power supply device Y2 in FIG. 3, that is, the state in which the power supply is not performed can be confirmed by the current detection, and the DC power cutoff can be safely performed.

Particularly, in the power supply system Z3 according to the present embodiment, even if the power supply device Y2 safely cuts off DC power, after the power conversion device 51 is stopped for some reason, the DC power line 101 is provided outside the power supply device Y2. A current may flow between the DC power line side terminal unit 201 and the DC power line side terminal unit 201. For example, when the connection of the DC power line side terminal portion 201, the power supply side terminal portion 21 and the like is weak and the case is in contact with another housing (electrically connected), or the power supply system Z3 and the power supply device Y3. It is conceivable that the cooperation of is not 1: 1, but 1: n (n is a natural number), and is not synchronized with the stop of another power conversion device. In the present embodiment, when the first control unit 61A satisfies I _DC1 <I _M1 and the second control unit 231 satisfies I _DC2 <I _M2 , the first opening / closing unit 41 and the second opening / closing unit 41 The part 221 is opened. Therefore, the DC power can be cut off more safely in the state where the power is not supplied.

(Fourth Embodiment)
FIG. 7: is a figure which shows the structure of the electric power supply system Z4 which concerns on the 4th Embodiment of this invention. The same components as those in FIG. 3 are designated by the same reference numerals and the description of the duplicated portions will be omitted.

[Power supply system Z4]
As shown in FIG. 7, the power supply system Z4 includes a DC power line side terminal unit 201 connected to the DC power line 101, a power supply device Y4 connected to the DC power line side terminal unit 201, and a power supply device. A command transmission unit 301 that transmits a removal command to Y4, and supplies power to a power load 401 connected to the power supply device Y4. The power load 401 is AC power, DC power, or both.

[Power supply device Y4]
The power supply device Y4 further includes a cooling unit 71 that cools the power conversion device 51 in addition to the power supply device Y2 shown in FIG. The cooling unit 71 is provided inside the housing of the power supply device Y4.

[First control unit 61A]
61 A of 1st control parts stop the power supply of the power converter device 51, when the instruction | command which opens the DC power line side terminal part 201 and the power supply side terminal part 21 is input from the command transmission part 301, power conversion. The first opening / closing part 41 is opened after the device 51 is stopped, and the connection of the connecting part 11 is released after the first opening / closing part 41 is opened.

[Control unit 71]
The cooling unit 71 is installed inside the power supply device Y4, and a command to open the DC power line side terminal unit 201 and the power supply side terminal unit 21 is input to the first control unit 61A from the command transmission unit 301. In this case, the cooling unit 71 is stopped after the power converter 51 is stopped.

  As described above, in the power supply system Z4 according to the present embodiment, since the cooling unit 71 is built in the power supply device Y4, there is no leakage of cooling water, and the power supply device Y4 can be removed only by electrical interruption. Is possible. That is, when the cooling system is brought from outside the power supply device, the cooling pipe of the cooling unit 71 (shown in the figure) is separated from the electrical connection parts (the DC power line side terminal part 201 and the power supply side terminal part 21). (Omitted) must also be removed, which is a difficult task. If the cooling unit 71 is housed in the power supply device Y4 and the cooling system is closed only inside, it is only necessary to disconnect the electrical connection. This can facilitate the removal of the power supply device Y4 from the DC power line.

  The present invention is not limited to the above-described embodiments, and includes other modifications and applications without departing from the scope of the present invention described in the claims.

  The above-described embodiments have been described in detail for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment. Further, it is possible to add / delete / replace other configurations with respect to a part of the configurations of the respective embodiments.

11 Connection part 21 Power supply side terminal part 31 1st current detection part 41,221 Switching part 51 Power converter 61,61A 1st control part 71 Cooling part 101 DC power line 201 DC power line side terminal part 211 2nd current detection Unit 231 Second control unit 301 Command transmission unit 401 Power load Y1, Y2, Y3, Y4 Power supply and demand device Z1, Z2, Z3, Z4 Power supply system I _DC1 Current amount of first current detection unit I _DC2 Second current detection Amount of current I _M1 1st current value (current target value)
I _M2 second current value (current target value)

Claims (9)

A DC power line side terminal portion to which power is supplied from the DC power line,
A power supply side terminal part to which DC power is supplied from the DC power line side terminal part;
A connection part for fixing or releasing the connection between the DC power line side terminal part and the power supply side terminal part;
A power conversion device that converts the DC power from the power supply side terminal unit to supply power to a power load;
A first opening / closing part connected between the power conversion device and the power supply side terminal part for supplying or stopping DC power;
A connection state of the power supply side terminal unit, an open state of the first opening / closing unit, and a first control unit that monitors the power supply state of the power conversion device to perform removal control,
The first control unit,
When a command to open the DC power line side terminal unit and the power supply side terminal unit is input, the power supply of the power conversion device is stopped, and the first opening / closing unit is opened after the power conversion device is stopped. The power supply system is characterized in that the connection of the power supply side terminal part is released after the first opening / closing part is opened. Further comprising a first current detection unit connected between the power supply side terminal unit and the power conversion device to detect a current amount of DC power of the DC power line,
The first control unit,
When a command to open the DC power line side terminal unit and the power supply side terminal unit is input, the value of the first current detection unit is detected after the power conversion device is stopped, and the first current detection is performed. When the value detected by the unit is smaller than a predetermined first current value, the first opening / closing unit is opened, and the connection of the power supply side terminal unit is released after the first opening / closing unit is opened. The power supply system according to claim 1, wherein the power supply system is a power supply system. A second opening / closing unit connected to the DC power line, a second current detecting unit connected to the second opening / closing unit for detecting the amount of DC power of the DC power line, and connected to the second current detecting unit. The DC power line side terminal portion,
A second control unit that monitors a connection state of the DC power line side terminal unit and an open state of the second opening / closing unit to perform removal control;
The second control unit
When a command to open the DC power line side terminal unit and the power supply side terminal unit is input, the value of the first current detection unit is detected after the power conversion device is stopped, and the first current detection is performed. When the value detected by the unit is smaller than the first current value, the first opening / closing unit is opened, and the value of the second current detecting unit is detected after the first opening / closing unit is opened, When the value detected by the second current detection unit is smaller than a predetermined second current value, the second opening / closing unit is opened, and the DC power line side terminal unit is opened after the second opening / closing unit is opened. The power supply system according to claim 2, wherein the connection is released. The power supply system according to claim 1, further comprising a command transmission unit that transmits a removal command to the first control unit. A power supply side terminal part to which DC power is supplied from the DC power line side terminal part;
A connection part for fixing or releasing the connection between the DC power line side terminal part and the power supply side terminal part;
A power conversion device that converts the DC power from the power supply side terminal unit to supply power to a power load;
A first opening / closing unit connected between the power conversion device and the power supply terminal unit 21 to supply or stop DC power;
A connection state of the power supply side terminal unit, an open state of the first opening / closing unit, and a first control unit that monitors the power supply state of the power conversion device to perform removal control,
The first control unit,
When a command to open the DC power line side terminal unit and the power supply side terminal unit is input, the power supply of the power conversion device is stopped, and the first opening / closing unit is opened after the power conversion device is stopped. The power supply device is characterized in that the connection of the power supply side terminal part is released after the first opening / closing part is opened. Further comprising a first current detection unit connected between the power supply side terminal unit and the power conversion device to detect a current amount of DC power,
The first control unit,
When a command to open the DC power line side terminal unit and the power supply side terminal unit is input, the value of the first current detection unit is detected after the power conversion device is stopped, and the first current detection is performed. When the value detected by the unit is smaller than a predetermined first current value, the first opening / closing unit is opened, and the connection of the power supply side terminal unit is released after the first opening / closing unit is opened. The power supply device according to claim 5, wherein the power supply device is a power supply device. The power supply device according to claim 5, further comprising a cooling unit that cools the power conversion device inside the housing. A power supply side terminal part to which DC power is supplied from the DC power line side terminal part;
A connection part for fixing or releasing the connection between the DC power line side terminal part and the power supply side terminal part;
A power conversion device that converts the DC power from the power supply side terminal unit to supply power to a power load;
A first opening / closing part connected between the power conversion device and the power supply side terminal part for supplying or stopping DC power;
A power supply method comprising: a first control unit that monitors a connection state of the power supply terminal unit, an open state of the first opening / closing unit, and a power supply state of the power conversion device to perform removal control. There
In the first control unit,
A stop step of stopping the power supply of the power conversion device when a command to open the DC power line side terminal section and the power supply side terminal section is input;
A releasing step of opening the first opening / closing part after the power conversion device is stopped and disconnecting the connection of the power supply side terminal part after the first opening / closing part is opened. Supply method. The first control unit further includes
After stopping the power conversion device, a current detection step of detecting a current amount of DC power between the power supply side terminal portion and the power conversion device,
In the releasing step,
When the detected current value is smaller than a predetermined first current value, the first opening / closing unit is opened, and the connection of the power supply side terminal unit is released after the first opening / closing unit is opened. The power supply method according to claim 8, wherein the power supply method is a power supply method.

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