JP2020068542A - Power supply system, power supply and demand system and power supply and demand method - Google Patents

Abstract

To perform attachment/detachment control of equipment to/from a power line with safety.SOLUTION: A DC power supply system Z1 has: terminal parts 201 and 21 supplied with a power from a DC power line 101; a connector 11 that holds or releases connection between the terminals; a power supply device 51 that converts the power from the terminal part 21 to supply a power to a power load; a controller 61 that monitors and controls the connector 11 and the power supply device 51; an opening/closing unit 221; a current detector 211 and a voltage detector 212; and a central control device 301 that controls those components. The central control device 301, in a case where a command for opening the terminal parts 201 and 21 is inputted, stops the supply of power of the power supply device 51 and then detects a current value of the DC power line 101 by means of the controller 61, and when the current value is smaller than a predetermined current value, opens the opening/closing unit 221, and then performs discharge by means of a discharge circuit 511, and when a voltage value after the discharge becomes smaller than a predetermined voltage value, gives notice that the connector 11 can be released.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system, a power supply and demand system, and a power supply and demand 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 there will be an increasing need for direct current (DC) power supply devices as well as alternating current (AC) power supply devices such as internal combustion engine power generators.

  For example, in Patent Document 1, "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, A first direct current load capable of supplying a minimum amount of direct current power for backup to the first direct current load when the alternating current power supplied to the conversion device momentarily drops in voltage or stops instantaneously. A power storage device, which is charged by the power conversion device, can be connected in parallel to the first power storage device and the first DC load, and stores the stored DC power from the power conversion device in the second power storage device. A second power storage device that can be supplied to a DC load and has a larger capacity than the first power storage device; and a first switch that is provided in a circuit that connects the power conversion device and the second power storage device. ,Previous A second switch provided in a circuit connecting the second power storage device and the second DC load; a power failure detection means for detecting a stop of supply of the AC power to the power conversion device; When the DC power stored in the power storage device is supplied to the second DC load, the first switch is turned off and the second switch is turned on, and the power failure detection unit detects the AC power. And a circuit switching unit that preferentially turns on the first switch and turns off the second switch when the supply stop to the power conversion device is detected. Is disclosed.

International Publication No. 2010/082506

  However, in Patent Document 1, although the first switch and the second switch have functions necessary for supplying and shutting off DC power, no specific configuration or control method is clearly indicated, so that DC power supply or There was a possibility that the interruption could not be done safely.

  The present invention has been made in view of such a background, and an object of the present invention is to safely control attachment / detachment of a device to / from a power line.

  In order to solve the above problems, a power supply system of the present invention includes a first terminal portion to which power is supplied from a power line, a second terminal portion to which power is supplied from the first terminal portion, and the first terminal portion. A connection part that fixes or releases the connection between the first terminal part and the second terminal part, a power supply device that converts the power from the second terminal part into power and supplies the power to the power load, and the connection part A first control unit that monitors and controls the state and the power supply state of the power supply device; a first opening / closing unit connected between the power line and the first terminal unit; and the first opening / closing unit. It has a current detection part and a voltage detection part connected between the 1st terminal part, and a central control device which controls them, and the central control device has the 1st terminal part and the 2nd terminal part. Is input by the first control unit when a command to open the After stopping the power supply of the power supply device, the current value of the power line is detected, and when the current value becomes smaller than a predetermined current value, the first opening / closing unit is opened, and the first opening / closing unit is opened. After that, the discharge is performed by the first control unit, the voltage value of the voltage detection unit is detected after the discharge by the first control unit, and when the voltage value becomes smaller than a predetermined voltage value, it is determined that the connection unit can be released. It is characterized by

  The power supply and demand system of the present invention is connected to a plurality of DC power supply devices that supply DC power, and is connected to the DC power supply devices. The DC power input from each of the DC power supply devices is combined and distributed. Power combiner / distributor, a plurality of DC / AC converters connected to the power combiner / distributor, and a plurality of DC / DC converters connected to the power combiner / distributor, one of which is the DC / AC converter, the other is connected to an AC device connection unit to which an AC device that supplies and receives AC power is connected, and one is connected to the DC / DC converter and the other is connected to a DC device that supplies and supplies DC power. By controlling any one of the DC device connection section, the power combiner / distributor, the DC / AC converter, and the DC / DC converter, the combination of DC power and each of them are controlled. A central control device for controlling the supply and distribution of electric power to the AC device connection part and the DC device connection part, and the AC included in the DC / AC converter, the DC / DC converter, and the DC power supply device. One of the / DC converters is used as a power supply device, and a connection unit that functions as the power supply system for connecting to or disconnecting from the power combining / distributing device is provided.

  A power supply and demand method for a power supply system according to the present invention includes a first terminal portion to which power is supplied from a power line, a second terminal portion to which power from the first terminal portion is supplied, and the first terminal portion. A connection unit that fixes or releases the connection of the second terminal unit, a power supply device that converts the power from the second terminal unit to supply power to a power load, a connection state of the connection unit, and the power. A first control unit that monitors and controls a power supply state of a power supply device, a first opening / closing unit connected between the power line and the first terminal unit, the first opening / closing unit, and the first terminal. A power supply and demand method for a power supply system having a current detection unit and a voltage detection unit connected to a unit, and a central control device that controls them. The central control device, when a command to open the first terminal portion and the second terminal portion is input, after stopping the power supply of the power supply device by the first control unit, the power The current value of the line is detected, and when the current value becomes smaller than a predetermined current value, the first opening / closing section is opened, and after the opening of the first opening / closing section, the first control section is caused to discharge the first opening / closing section. The voltage value of the voltage detection unit is detected after discharging by the unit, and when the voltage value becomes smaller than a predetermined voltage value, it is determined that the connection unit can be released.

  Other means will be described in the modes for carrying out the invention.

  According to the present invention, by confirming the state of the device connected to the power line by detecting the current or voltage, it is possible to safely perform the attachment / detachment control of the device to / from the power line.

It is a figure which shows the structure of the DC electric power supply system which concerns on 1st Embodiment. It is a flowchart (the 1) of the disconnection process of a DC power supply apparatus. It is a flowchart (the 2) of the disconnection process of a DC power supply apparatus. It is a figure which shows the structure of the DC electric power supply system which concerns on 2nd Embodiment. It is a flowchart (the 1) of the connection process of a DC power supply apparatus. It is a flowchart (the 2) of the connection process of a DC power supply apparatus. It is a figure which shows the structure of the DC electric power supply system which concerns on 3rd Embodiment. It is a figure which shows the structure of the DC electric power supply system which concerns on 4th Embodiment. It is a figure which shows the structure of the AC electric power supply system which concerns on 5th Embodiment. It is a figure which shows the structure of the DC electric power supply system which concerns on 6th Embodiment.

Hereinafter, modes for carrying out 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 DC power supply system Z1 according to the first embodiment.
[DC power supply system Z1]
The DC power supply system Z1 includes a DC power line 101, an opening / closing unit 221, a terminal unit 201, a DC power supply device Y1, which is connected to the DC power line 101, a central control device 301, a notification unit 302, and an input unit 303. is doing. The terminal portion 201 is connected to the terminal portion 21 of the DC power supply device Y1 and is connected to the opening / closing portion 221.

  The DC power supply device Y1 includes a terminal unit 21, a power conversion device 51, and a control unit 61 that controls these. The central control device 301 transmits a mounting / removing command to the control unit 61 of the DC power supply device Y1, and a closing command / opening command to the opening / closing unit 221.

  The DC power supply system Z1 further includes a current detection unit 211 and a voltage detection unit 212 between the opening / closing unit 221 and the terminal unit 201. The central control device 301 receives information on the value of current flowing through the DC power line 101 from the current detection unit 211, and receives information on the voltage value applied to the DC power line 101 from the voltage detection unit 212. The opening / closing unit 221 is composed of a semiconductor device or an electromagnetic contactor.

  A power load 401 is connected to the DC power supply device Y1 to supply or receive power. The power load 401 is AC power, DC power, or both.

[DC power supply device Y1]
The DC power supply device Y1 includes a terminal unit 21, a power conversion device 51, and a control unit 61 that controls these. The terminal portion 21 is connected to the terminal portion 201. The connection portion 11 fixes or releases the connection between the terminal portion 201 and the terminal portion 21. Fixing and releasing of the connection between the terminal portion 201 and the terminal portion 21 by the connecting portion 11 is automatically performed by an actuator or the like, but may be performed manually.
The power conversion device 51 is connected to the terminal unit 201, converts the DC power into power, and supplies the converted power to the power load 401. The control unit 61 monitors and controls the power supply state of the terminal unit 21 and the power conversion device 51.

  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. The DC power supply device Y1 is equipped with a discharge circuit 511 that discharges its own power.

[Central control unit 301]
The central control device 301 is, for example, a computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The notification unit 302 is, for example, a display, a speaker, a display lamp, or the like. The input unit 303 is, for example, a keyboard, a switch, a touch panel, or the like.

  The central control device 301 starts the following series of processing when a command to open the terminal unit 201 and the terminal unit 21 is input from the input unit 303. The central control device 301 transmits a command to open the terminal portion 201 and the terminal portion 21 to the control portion 61, and the control portion 61 stops the power supply of the power conversion device 51. After stopping the power conversion device 51, the central control device 301 confirms that the current amount of the current detection unit 211 is equal to or less than a predetermined current value. The central control device 301 opens the opening / closing part 221 after confirming that the current amount of the current detection part 211 is equal to or less than the predetermined current value. After opening the opening / closing unit 221, the central control device 301 discharges the power of the DC power supply device Y1 by the discharge circuit 511 mounted on the DC power supply device Y1 according to a command from the control unit 61. After discharging the DC power supply device Y1, the central control device 301 confirms that the voltage value of the voltage detection part 212 is equal to or lower than a predetermined voltage value, and then sends a signal for disconnecting the connection part 11 to the control part 61. send. The control unit 61 sends a signal for releasing the connection to the connection unit 11.

[Disconnection process of DC power supply device Y1]
2A and 2B are flowcharts showing a disconnection process of the DC power supply device Y1 according to the first embodiment.
When a command to open the terminal unit 201 and the terminal unit 21 is input, the central control device 301 starts the following disconnection processing.
The central controller 301 inputs to the control unit 61 a command to open the terminal unit 201 and the terminal unit 21 (S10). The control unit 61 sends a signal to stop the power electronics device 51 to the power electronics device 51 (S11). After receiving the stop signal, the power conversion device 51 shifts to a process of stopping its own operation. This stop process is, for example, a process of gate-blocking all the elements in the power conversion device 51.

  The control unit 61 confirms the power supply status of the power conversion device 51 (S13) after a time sufficient for stopping the power conversion device 51 has elapsed (S12). When the power supply status of the power converter 51 is in the stopped state (Yes), the process proceeds to step S14. When the power supply status of the power conversion device 51 is not in the stopped state (No), the control unit 61 transmits the information of "removal NG" to the central control device 301 (S25). The central control device 301 informs the user of the information of "removal NG" by the notifying unit 302 (S27), and stops the control flow. Here, the notification of the "removal NG" information by the notification unit 302 may be, for example, notification by characters or icons on the display, notification by synthetic voice from a speaker, or notification by blinking a display lamp. Well, not limited.

In step S14 in which the power supply status of the power converter 51 is in the stopped state, the central controller 301 detects the current amount I _DC1 of the current detector 211. Assuming that the current target value of the current detection unit 211 is I _M1 , when I _DC1 <I _M1 is satisfied, the central control device 301 proceeds to step S15. When I _DC1 <I _M1 is not satisfied (No), the central control device 301 notifies the user of the information “dismounting failure” by the notification unit 302 (S27) and stops the control flow.

In step S15 in which I _DC1 <I _M1 is satisfied, the central control device 301 sends a signal to the opening / closing unit 221 to open the opening / closing unit 221. The opening / closing unit 221 shifts to the opening operation after receiving the opening signal. After a sufficient time has passed for the opening / closing unit 221 to open (S16), the central control device 301 confirms the opening state of the opening / closing unit 221 (S17). When the opening / closing part 221 is opened (Yes), the process proceeds to the next step S18 (see FIG. 2B). When the opening / closing unit 221 is opened (No), the central control device 301 notifies the user of the information “dismounting NG” by the notification unit 302 (S27), and stops the control flow.

  In step S <b> 18 in which the opening / closing unit 221 is in the open state, the central control device 301 transmits the command to discharge the power conversion device 51 to the control unit 61 by the discharge circuit 511 mounted on the power conversion device 51.

After a sufficient time has elapsed for the power conversion device 51 to discharge (S19), the central control device 301 detects the voltage value V _DC1 of the voltage detection unit 212 (S20). Assuming that the voltage target value of the voltage detection unit 212 is V _M1 , if V _DC1 <V _M1 is satisfied (Yes), the central controller 301 proceeds to the next step S21. When V _DC1 <V _M1 is not satisfied (No), the central control device 301 notifies the user of the information of “removal NG” by the notification unit 302 (S27) and stops the control flow.

In step S21 when V _DC1 <V _M1 is satisfied, the central control device 301 determines that the connection unit 11 can be released. That is, the central control device 301 sends a command for releasing the connecting portion 11 to the control portion 61. The control unit 61 sends a signal for releasing the connection unit 11 to the connection unit 11. After receiving the release command, the connection unit 11 shifts to the release operation. After a time sufficient for releasing the connection unit 11 has passed (S22), the control unit 61 confirms the release status (S23). When the connection unit 11 is released (Yes), the control unit 61 transmits the information “OK to remove” to the central control device 301. The central control device 301 notifies the user of the information “OK to remove” by the notification unit 302 (S24).

  When the connection unit 11 is not released (No), the control unit 61 transmits the information of “removal NG” to the central control device 301 (S26). The central control device 301 informs the user of the information of "removal NG" by the notifying unit 302 (S27), and stops the control flow.

  When the connection unit 11 is manually released, the central control device 301 determines that the connection unit 11 can be released by the notifying unit 302 when the central control device 301 determines that the connection unit 11 can be released. The information may be notified to the user. Accordingly, the central control device 301 can safely remove the DC power supply device Y1.

  As described above, according to the present embodiment, it is possible to confirm the state in which the power is not supplied by the current detection and the state in which the voltage is not applied by the voltage detection. As a result, it is possible to safely remove the DC device from the DC power line 101.

[Second Embodiment]
The second embodiment relates to control for mounting the DC power supply device Y2 on the DC power line 101 in the DC power supply system Z2.

[DC power supply system Z2]
FIG. 3 is a diagram showing the configuration of the DC power supply system Z2 according to the second embodiment.
The DC power supply system Z2 includes a DC power line 101, an opening / closing unit 221, a charging unit 241, a terminal unit 201, a DC power supply device Y2 connected to the DC power line 101, a central control device 301, a notification unit 302, and an input. It has a section 303. The terminal unit 201 is connected to the terminal unit 21 of the DC power supply device Y2, and is connected to the opening / closing unit 221 via the charging unit 241.
The charging unit 241 is configured by connecting an opening / closing unit 243 and a charging resistor 242 in parallel.

  The DC power supply device Y2 includes a terminal unit 21, a power conversion device 51, and a control unit 61 that controls these. The central control device 301 transmits a mounting / removing command to the control unit 61 of the DC power supply device Y2, and a closing command / opening command to the opening / closing unit 221.

  The DC power supply system Z2 further includes a current detection unit 211 and a voltage detection unit 212 between the opening / closing unit 221 and the terminal unit 201. The central control device 301 receives information on the value of current flowing through the DC power line 101 from the current detection unit 211, and receives information on the voltage value applied to the DC power line 101 from the voltage detection unit 212. The opening / closing part 221 is composed of a semiconductor device or an electromagnetic contactor.

  A power load 401 is connected to the DC power supply device Y2 to supply or receive power. The power load 401 is AC power, DC power, or both.

[DC power supply device Y2]
The DC power supply device Y2 is configured and operates similarly to the DC power supply device Y1 of the first embodiment.

[Central control unit 301]
The central control device 301 is, for example, a computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The notification unit 302 is, for example, a display or a speaker. The input unit 303 is, for example, a keyboard or a switch.

The central control device 301 starts the following connection processing when a command to connect the terminal unit 201 and the terminal unit 21 is input.
The central control device 301 confirms that the opening / closing unit 221 is opened, that the voltage value of the voltage detection unit 212 is less than or equal to a predetermined voltage value, and that the opening / closing unit 243 of the charging unit 241 is opened. After confirming these, the central control device 301 sends a signal to the control part 61 to connect the connection part 11. The control unit 61 sends a connection signal to the connection unit 11. After the connection unit 11 is connected, the central control device 301 sends a signal to the opening / closing unit 221 to turn on itself. After the opening / closing unit 221 is turned on, power is supplied from the DC power line 101 to the DC power supply device Y2 and the power conversion device 51 via the charging resistor 242 of the charging unit 241, and a line, a capacitor, or the like (not shown) is charged. . After this charging, the central control device 301 confirms that the voltage value of the voltage detection unit 212 is within a predetermined range, and then issues a command to close the opening / closing unit 243 of the charging unit 241 and bypass the charging resistor 242. introduce.

[Connection processing of DC power supply device Y2]
4A and 4B are flowcharts showing a connection process of the DC power supply device Y2 according to the second embodiment.
When a command to connect the terminal unit 201 and the terminal unit 21 is input, the central control device 301 starts the process of step S40.
The central controller 301 confirms that the opening / closing part 221 is open (S40). When the open state of the opening / closing part 221 is open (Yes), the process proceeds to the next step S41. When the opening state of the opening / closing unit 221 is not open (No), the central control device 301 notifies the information of “attachment NG” by the notification unit 302 (S56), and stops the control flow.

When the voltage detection value of the voltage detection unit 212 detects V _DC2 and the predetermined voltage value of the voltage detection unit 212 is V _M2 , the central control device 301 confirms that V _DC2 <V _M2 is satisfied (S41). ). If the voltage detection value of the voltage detection unit 212 satisfies a _{V DC2 <V M2 (Yes)} , the process proceeds to the next step S42. When _VDC2 < _VM2 is not satisfied (No), the central control device 301 notifies the user of the information of "attachment NG" by the notification unit 302 (S56), and stops the control flow.

  Next, the central control device 301 confirms that the opening / closing part 243 of the charging part 241 is opened (S42). When the opening state of the opening / closing part 243 is open (Yes), the process proceeds to the next step S43). When the open state of the opening / closing unit 243 is not open, the central control device 301 notifies the user of the information “attachment NG” by the notification unit 302 (S56), and stops the control flow.

The order of steps S40 to S42 may be changed.
Next, the central control device 301 sends a signal for connecting the connecting portion 11 to the control portion 61. The control unit 61 sends a connection signal to the connection unit 11 (S43). After receiving the connection signal, the connection unit 11 shifts to the connection operation. The control unit 61 confirms the connection status of the connection unit 11 (S45) after a sufficient time has elapsed for the connection unit 11 to connect (S44). When the connection unit 11 is not connected (No), the control unit 61 transmits the information of “attachment NG” to the central control device 301 (S55). The central control device 301 notifies the user of the information of “attachment NG” by the notification unit 302 (S56), and stops the control flow.
When the connection unit 11 is connected (Yes), the central controller 301 proceeds to the next step S46.

  When the connection unit 11 is manually released, the central control device 301 may notify the user of “connection OK” information by the notification unit 302. This allows the user to fix the connection of the connection unit 11, and the central control device 301 can proceed to the processing of the next step S46.

  The central control device 301 sends a signal for turning on the opening / closing section 221 to the opening / closing section 221 (S46). The opening / closing unit 221 shifts to the closing operation after receiving the closing signal. After a time sufficient for the opening / closing unit 221 to be closed has elapsed (S47), the central control device 301 confirms the closing state of the opening / closing unit 221 (S48). When the opening / closing unit 221 is closed (Yes), the process proceeds to the next step S49. When the opening / closing unit 221 is not turned on (No), the central control device 301 notifies the user of the information of “attachment NG” by the notification unit 302 (S56), and stops the control flow.

After the opening / closing unit 221 is turned on, the DC power line 101 charges the lines (not shown) and DC capacitors of the DC power supply device Y2 and the power conversion device 51 via the charging resistor 242 of the charging unit 241. After a sufficient time has elapsed for charging the DC power supply device Y2 and the power conversion device 51 (S49), the central control device 301 confirms the voltage value V _DC2 of the voltage detection unit 212. A voltage target value of the voltage detection unit 212 with respect to _{V DC,} a predetermined voltage value _{V M3, | V DC2 -V DC} | when satisfied _{<V M3} (Yes), the central controller 301, the next step S51 Proceed to. When | V _DC2 −V _DC | <V _M3 is not satisfied (No), the central control device 301 notifies the user of the information “attachment NG” by the notification unit 302 (S56), and stops the control flow.

In step S51 that satisfies | V _DC2 −V _DC | <V _M3 , the central control device 301 transmits to the charging unit 241 a command to close the opening / closing unit 243 and bypass the charging resistor 242. After receiving the connection signal, the opening / closing unit 243 shifts to the closing operation. After a time sufficient for the opening / closing unit 243 to be turned on (S52), the central control device 301 confirms the opening / closing state of the opening / closing unit 243. When the opening / closing status of the opening / closing unit 243 is not turned on (No), the central control device 301 notifies the user of the information “attachment NG” by the notification unit 302 (S56), and stops the control flow.
When the opening / closing unit 243 is turned on (Yes), the central control device 301 notifies the user of the information “attachment OK” by the notification unit 302, and ends the processing in FIGS. 4A and 4B.

  In addition, in the closing operation of the opening / closing unit 243 in step S51, the central control device 301 may detect the current amount of the current detection unit 211. When an overcurrent flows, the central control device 301 notifies the user of the information of "attachment NG" by the notification unit 302 (S56), and stops the control flow. When the overcurrent does not flow, the central control device 301 notifies the user of the information “Installation OK” by the notification unit 302, and ends the processing in FIGS. 4A and 4B.

As described above, according to the present embodiment, it is possible to confirm the charging state of the line (not shown) connected to the DC power line 101 or the DC capacitor by detecting the voltage. Furthermore, since the switch 243 is turned on after charging the line and the DC capacitor (not shown) through the charging resistor 242, it is possible to prevent a large current from flowing in the DC power line 101.
This allows the DC power supply device Y2 and the DC power line 101 to be safely connected and disconnected.

[Third Embodiment]
[DC power supply system Z3]
FIG. 5: is a figure which shows the structure of DC electric power supply system Z3 which concerns on 3rd Embodiment.
The DC power supply system Z3 includes a DC power line 101, an opening / closing unit 221, a charging unit 241, a terminal unit 201, a DC power supply device Y3 connected to the DC power line 101, a control unit 231, and a central control device 301. The notification unit 302 and the input unit 303 are included. The terminal unit 201 is connected to the terminal unit 21 of the DC power supply device Y3, and is connected to the opening / closing unit 221 via the charging unit 241.
The charging unit 241 is configured by connecting an opening / closing unit 243 and a charging resistor 242 in parallel.

  The DC power supply device Y3 includes a terminal unit 21, a power conversion device 51, and a control unit 61 that controls these. The central control device 301 transmits a mounting / removing command to the control unit 61 of the DC power supply device Y3, and transmits a closing command / opening command to the opening / closing unit 221 via the control unit 231.

  The DC power supply system Z3 further includes a current detection unit 211 and a voltage detection unit 212 between the opening / closing unit 221 and the terminal unit 201. The control unit 231 receives the information on the value of the current flowing through the DC power line 101 from the current detection unit 211, and receives the information on the voltage value applied to the DC power line 101 from the voltage detection unit 212. The opening / closing part 221 is composed of a semiconductor device or an electromagnetic contactor.

  The control unit 231 exchanges data with the central control device 301. At this time, the control unit 231 may directly transfer the current detection data and the voltage detection data to the central control device 301, or may send and receive the processed data. In this way, the control unit 231 can reduce the calculation load of the central control device 301 and can perform flexible data processing.

  A power load 401 is connected to the DC power supply device Y3 and supplies or receives power. The power load 401 is AC power, DC power, or both.

[DC power supply device Y3]
The DC power supply device Y3 is configured and operates in the same manner as the DC power supply device Y1 of the first embodiment.

  As a difference between the third embodiment and the first and second embodiments, a new control unit 231 is provided, and the opening / closing unit 221, the current detection unit 211, the voltage detection unit 212, and the central control device 301 are controlled. Information is transmitted via the unit 231. Furthermore, when there are a plurality of DC power supply systems Z3, the control unit 231 can be shared and used. By commonly using the control unit 231, even when the DC power supply system Z3 is newly added, the increase in the control unit 231 is reduced and the number of signal lines connected to the central control device 301 is reduced. It can be reduced. Thereby, the configuration of the DC power supply system Z3 can be simplified.

[Fourth Embodiment]
The fourth embodiment relates to control when connecting the DC power supply device Y4 to the DC power line 101 via the opening / closing unit 221.

[DC power supply system Z4]
FIG. 6 is a diagram showing a configuration of a DC power supply system Z4 according to the fourth embodiment.
The DC power supply system Z4 of the fourth embodiment has the same configuration as the DC power supply system Z1 of the second embodiment, and further has a new cooling unit 71 inside the DC power supply system Z1. It is receiving power. The cooling unit 71 can be activated by receiving the power supply from the DC power line 101 after the information “installation OK” is transmitted to the central control device 301.

[DC power supply device Y4]
The DC power supply device Y4 is configured and operates in the same manner as the DC power supply device Y1 of the first embodiment.
The cooling unit 71 is installed inside the DC power supply system Z4, but may be installed inside the DC power supply device Y4. According to the fourth embodiment, it is possible to safely cut off DC power in a state where power is not supplied. Further, since the cooling unit 71 can be built in the DC power supply system Z4 or the DC power supply device Y4, the DC power supply system Z4 and the DC power supply device Y4 can be removed only by electrical interruption without leakage of cooling water. It is possible. This facilitates the removal of the DC power supply device Y4 from the DC power line 101.

[Fifth Embodiment]
The fifth embodiment relates to the configuration and control when connecting the AC power supply device Y5 to the AC power line 102.
FIG. 7 is a diagram showing a configuration of an AC power supply system Z5 according to the fifth embodiment.
[AC power supply system Z5]
The AC power supply system Z5 includes an AC power line 102, an opening / closing unit 221, a terminal unit 201, an AC power supply device Y5 connected to the AC power line 102, a central control device 301, a notification unit 302, and an input unit 303. is doing. The terminal portion 201 is connected to the terminal portion 21 of the AC power supply device Y5, and is connected to the opening / closing portion 221.

  The AC power supply device Y5 includes a terminal unit 21, a power conversion device 52, and a control unit 61 that controls these. The central control device 301 transmits an installation / removal command to the control unit 61 of the AC power supply device Y5, and a closing command / opening command to the opening / closing unit 221.

  The AC power supply system Z5 further includes a current detection unit 213 and a voltage detection unit 214 between the opening / closing unit 221 and the terminal unit 201. The central control device 301 receives information on the alternating current value flowing through the AC power line 102 from the current detection unit 213, and receives information on the alternating voltage value applied to the AC power line 102 from the voltage detection unit 214. The opening / closing unit 221 is composed of a semiconductor device or an electromagnetic contactor.

  A power load 401 is connected to the AC power supply device Y5 to supply or receive power. The power load 401 is AC power, DC power, or both.

[AC power supply device Y5]
The AC power supply device Y5 includes a terminal unit 21, a power conversion device 52, and a control unit 61 that controls these. The terminal portion 21 is connected to the terminal portion 201. The connection portion 11 fixes or releases the connection between the terminal portion 201 and the terminal portion 21. The power conversion device 52 is connected to the terminal unit 201, converts the AC power into power, and supplies the converted power to the power load 401. The control unit 61 monitors and controls the power supply state of the terminal unit 21 and the power conversion device 52.

  In addition, the power conversion device 52 converts the AC power of the AC power line 102 into AC power, DC power, or both in accordance with the power load 402. The AC power supply device Y5 is equipped with a discharge circuit 512 that discharges its own power.

[Central control unit 301]
The central control device 301 is, for example, a computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The notification unit 302 is, for example, a display or a speaker. The input unit 303 is, for example, a keyboard or a switch.

  The central control device 301 starts the following series of processing when a command to open the terminal unit 201 and the terminal unit 21 is input from the input unit 303. The central control device 301 transmits a command to open the terminal portion 201 and the terminal portion 21 to the control portion 61, and the control portion 61 stops the power supply of the power conversion device 52. After stopping the power conversion device 52, the central control device 301 confirms that the alternating current amount of the current detection unit 213 is equal to or less than a predetermined current value. The central control device 301 opens the opening / closing unit 221 after confirming that the current amount of the current detection unit 213 is equal to or less than the predetermined current value.

  After opening the opening / closing unit 221, the central control device 301 discharges the power of the AC power supply device Y5 by the discharge circuit 512 mounted on the AC power supply device Y5 according to a command from the control unit 61. After discharging the AC power supply device Y5, the central control device 301 confirms that the voltage value of the voltage detection unit 214 is equal to or lower than a predetermined voltage value, and then sends a signal for disconnecting the connection unit 11 to the control unit 61. send. The control unit 61 sends a signal for releasing the connection to the connection unit 11. When the connection unit 11 is released, the central control device 301 notifies the notification unit 302 that removal is OK.

  As described above, not only the DC power supply line but also the AC power supply line, the state of the device connected to the power line is confirmed by the detection of the current and the voltage, thereby safely controlling the attachment / detachment of the device to / from the power line. be able to.

[Sixth Embodiment]
[Power supply and demand system Z]
FIG. 8: is a figure which shows the structural example of the electric power supply and demand system Z which concerns on the 6th Embodiment of this invention, Moreover, the electric power supply and demand system Z and each load by the side of a power grid (commercial power grid) and a consumer side. It is a figure which shows an example of connection relation.

In FIG. 8, switches (switches) SW1, SW2, SW3 are provided between the power system (L) side and the customer load D and the power supply and demand system Z on the customer side.
One of the switches SW3 is connected to the power system (L) and the other is connected to the switches SW1 and SW2. One of the switches SW1 is connected to the switch SW3, and the other is connected to the power supply and demand system Z. One of the switches SW2 is connected to the switch SW3, and the other is connected to the consumer load D on the consumer side.

  When the switches SW1, SW2, SW3 are all closed (ON: ON), power is supplied from the power system (L) side to the customer side. This case is referred to as "when the system is connected". Even during the grid interconnection, the DC power supply device 3 provided in the power supply and demand facilities E1 to En in the power supply and demand system Z is generally in operation.

<< Structure of power supply and demand system Z >>
In FIG. 8, the power supply and demand system Z includes a central controller 301, a power combiner / distributor 2, and n (n is a natural number) power supply and demand facilities E1 to En. Hereinafter, when the power supply and demand facilities E1 to En are not particularly distinguished, they are simply referred to as the power supply and demand facility E.

  In addition, each of the power supply and demand equipment E1 to En in the power supply and demand system Z is connected to a vehicle V equipped with a power storage device F capable of storing power from the outside, such as an electric vehicle and a plug-in hybrid vehicle. Further, the central controller 301 controls the n power supply and demand facilities E (E1 to En) and the power combiner / distributor 2. The central control device 301 is connected to the notification unit 302 and the input unit 303.

<< Electric power supply and demand equipment E >>
The power supply and demand facility E includes a DC power supply device 3, a DC / DC converter 4, a DC / AC converter 5, a DC device connection JD, and an AC device connection JA. Further, the power combiner / distributor 2 is installed across each of the power supply and demand facilities E1 to En.

  Further, the power supply and demand facility E is provided with a DC power supply device connecting portion J41, DC / AC converter connecting portions J11 and J12, DC / DC converter connecting portions J21 and J22, and an AC connecting portion J31. These connecting parts J41, J11, J12, J21, J22, and J31 are controlled by the central controller 301.

  The other side of the switch SW1 is connected to the AC terminal of the DC / AC converter 5 via the AC connection portion J31 and the AC device connection portion JA. At this time, the AC connection portion J31 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The DC / AC converter 5 functions as the AC power supply device Y5 (see FIG. 7) of the fifth embodiment.

  The other end of the AC device connection portion JA is connected to the AC terminal of the DC / AC converter 5 via the DC / AC converter connection portion J11. At this time, the DC / AC converter connecting portion J11 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The DC / AC converter 5 functions as the AC power supply device Y5 (see FIG. 7) of the fifth embodiment.

  The DC terminal of the DC / AC converter 5 is connected to the power combiner / distributor 2 via the DC / AC converter connection J11. At this time, the DC / AC converter connecting portion J11 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The power combiner / distributor 2 functions as the DC power supply devices Y1 to Y4 of the first to fourth embodiments.

  The DC power supply device 3 is connected to the power synthesis / distribution device 2 via a DC power supply device connection portion J41. The DC power supply device connecting portion J41 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The power combiner / distributor 2 functions as the DC power supply devices Y1 to Y4 of the first to fourth embodiments.

  Furthermore, the power combiner / distributor 2 is connected to the input terminal of the DC / DC converter 4 via a DC / DC converter connection J21. The DC / DC converter connection portion J21 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The DC / DC converter 4 functions as the DC power supply devices Y1 to Y4 of the first to fourth embodiments.

  A DC device connection JD is connected to the output terminal of the DC / DC converter 4 via a DC / DC converter connection J22. A power storage device F mounted on the vehicle V is further connected to the DC device connection portion JD. The DC / DC converter connection portion J22 corresponds to each element from the opening / closing portion 221 to the terminal portion 201. The DC / DC converter 4 functions as the DC power supply devices Y1 to Y4 of the first to fourth embodiments.

  These connecting portions J41, J11, J12, J21, J22, and J31 have a function as a connector. For example, the DC / AC converter connection parts J11 and J12 are connectors for enabling removal when the DC / AC converter 5 is replaced. Similarly, the DC / DC converter connection portions J21 and J22 are connectors for enabling removal when the DC / DC converter 4 is replaced. The DC / DC converter connection part J22 is also a connector for enabling removal when replacing the DC device connection part JD.

The DC power supply device connection portion J41 is a connector that enables detachment when the DC power supply device 3 is replaced. The AC connection portion J31 is a connector for disconnecting the power supply and demand facility E.
In addition, the DC device connection portion JD and the AC device connection portion JA have a function as a switch (switch).

  The DC power supply device 3 is a power generation device capable of generating DC power. For example, in the case of an internal combustion engine power generator, it is provided with an internal combustion engine, a generator device, an AC / DC converter and the like. That is, the DC power supply device 3 generates heat energy in the internal combustion engine, converts the heat energy into AC power (AC power) in the generator device, and converts the AC power into DC power (DC power) in the AC / DC converter. Output.

  The internal combustion engine power generation device as the DC power supply device 3 is, for example, a diesel engine power generation device, a gas turbine engine power generation device, or the like. The DC power supply device 3 (internal combustion engine power generator or the like) is connected to the power combiner / distributor 2 through the DC power supply device connection portion J41.

  The power combiner / distributor 2 combines the DC power supplied by each DC power supply device 3 and connects the DC / DC converter 4 and each DC / AC converter connection J11 via each DC / DC converter connection J21. The DC power is distributed to the DC / AC converter 5 via the DC / AC converter 5.

  One of the DC / DC converters 4 is connected to the power combiner / distributor 2 via a DC / DC converter connection J21, and the other is connected to the vehicle V via a DC / DC converter connection J22 and a DC device connection JD. It is connected to a power storage device F mounted on an electric vehicle or the like. The DC / DC converter 4 converts the voltage of the power distributed from the power combining / distribution device 2 into a charging voltage of the vehicle V (power storage device F) or the like.

  If the method of charging the power storage device F is charging with a constant current / constant voltage, the DC / DC converter 4 converts the electric power to a constant current until a predetermined charging voltage is reached. The current of the DC / DC converter 4 is controlled in advance in the power combiner / distributor 2 so as not to exceed the rated value of the power storage device F. Then, when the charging voltage reaches a predetermined voltage, the DC / DC converter 4 converts the electric power so that the charging voltage becomes a constant voltage.

The DC side of the DC / AC converter 5 is connected to the electric power system L via a DC / AC converter connecting section J12, an AC device connecting section JA, and an AC connecting section J31.
The DC / AC converter 5 converts the DC power sent from the power combiner / distributor 2 into AC power (for example, 100 V, 50 Hz) to the customer load D and the power system L.
At this time, it is desirable that the DC / AC converters 5 of each of the power supply and demand facilities E1 to En generate AC power so that the phases of the generated AC voltages are aligned. The phase of the AC voltage to be generated is based on the control information from the central controller 301.

  For example, when the DC / AC converter 5 has an inverter (DC / AC conversion) circuit by PWM control (Pulse Width Modulation: pulse width control), the control information includes a switching element (not shown) such as an IGBT (Insulated Gate Bipolar Transistor). Is the duty of the pulse that turns on.

The power storage device F mounted on the vehicle V is connected to the DC device connection portion JD. The present invention is not limited to this, and instead of the power storage device F, another DC device that requires DC power may be connected.
Further, the customer load D is connected to the AC device connection portion JA via the switches SW1 and SW2. Further, the power system L is connected via the switches SW1 and SW3.

  The AC / DC converter, the DC / DC converter 4, and the DC / AC converter 5 included in the DC power supply device 3 include the DC power supply systems Z1 to Z4 described in the first to fourth embodiments, and Any configuration of the AC power supply system Z5 described in the fifth embodiment can be applied. Accordingly, the power supply / demand facility E, or the DC power supply device 3, the DC / DC converter 4, and the DC / AC converter 5 included in the power supply / demand facility E can be newly added, replaced, or deleted depending on the situation. Therefore, it is possible to provide the power supply and demand system Z capable of flexibly expanding and changing the power supply capacity of the existing facility.

  As described above, according to the present invention, it is possible to safely control attachment / detachment of a device to / from the power line by checking the state of the device connected to the power line by detecting current or voltage.

(Modification)
The present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. A part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. It is also possible to add / delete / replace other configurations with respect to a part of the configurations of the respective embodiments.

A part or all of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware such as an integrated circuit. The above-described configurations and functions may be realized by software by a processor interpreting and executing a program that realizes each function. Information such as a program, a table, and a file that realizes each function can be placed in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as a flash memory card or a DVD (Digital Versatile Disk). it can.
In each embodiment, the control lines and information lines are shown to be necessary for explanation, and not all the control lines and information lines in the product are necessarily shown. In reality, it may be considered that almost all the configurations are connected to each other.

101 DC power line (power line)
102 AC power line (power line)
11 Connection part 2 Power combiner / distributor 201 Terminal part (1st terminal part)
21 terminal part (second terminal part)
211 Current Detector 212 Voltage Detector 213 Current Detector 214 Voltage Detector 221 Opening / Closing Unit (First Opening / Closing Unit)
243 Opening / closing part (second opening / closing part)
241 Charging unit 242 Charging resistor 3 DC power supply device 301 Central control device 302 Notification unit 303 Input unit 4 DC / DC converter 401 Power load 5 DC / AC converter 51, 52 Power supply device 511, 512 Discharge circuit 61 Control unit (No. 1 control unit)
231 Control Unit (Second Control Unit)
71 Cooling unit Y1, Y2, Y3, Y4 DC power supply device Z1, Z2, Z3, Z4 DC power supply system D Customer load (AC equipment, equipment)
E, E1 to En Electric power supply and demand equipment F Power storage device (DC equipment, equipment)
J11, J12 DC / AC converter connection (connector)
J21, J22 DC / DC converter connection (connector)
J31 AC connection part (connector)
J41 DC power supply device connection part JA AC device connection part (switch)
JD DC equipment connection (switch)
L power system SW1, SW2, SW3 switch V vehicle (DC equipment)
Z power supply and demand system

Claims (10)

A first terminal portion to which electric power is supplied from an electric power line;
A second terminal portion to which electric power is supplied from the first terminal portion;
A connection portion for fixing or releasing the connection between the first terminal portion and the second terminal portion,
An electric power supply device for converting electric power from the second terminal portion to supply electric power to an electric power load;
A first control unit that monitors and controls the connection state of the connection unit and the power supply state of the power supply device;
A first opening / closing part connected between the power line and the first terminal part;
A current detection unit and a voltage detection unit connected between the first opening / closing unit and the first terminal unit;
Has a central controller that controls them,
The central control device, when a command to open the first terminal portion and the second terminal portion is input, after stopping the power supply of the power supply device by the first control unit, the power The current value of the line is detected, and when the current value becomes smaller than a predetermined current value, the first opening / closing section is opened, and after the opening of the first opening / closing section, the first control section is caused to discharge the first opening / closing section. Detects the voltage value of the voltage detection unit after the discharge by the unit, and determines that the connection unit can be released when the voltage value becomes smaller than a predetermined voltage value,
A power supply system characterized by the above. A notification unit for notifying the user of information,
When the voltage value becomes smaller than a predetermined voltage value, the central control device notifies the notification part that the connection part can be released,
The power supply system according to claim 1, wherein: A notification unit for notifying the user of information,
The central control device releases the connection part, and notifies the power supply device that the power supply device can be removed by the notification part.
The power supply system according to claim 1, wherein: A charging unit connected between the first switching unit and the current detection unit and the voltage detection unit;
The charging unit has a charging resistor and a second opening / closing unit,
The central control device opens the first opening / closing part when the command to connect the first terminal part and the second terminal part is input, and the voltage value of the voltage detecting part is below a predetermined voltage value. Yes, if the second opening / closing part is opened, a signal for connecting the connection part is sent to the first control part,
By connecting the first opening / closing part after connecting the connection part, the power line and the power supply device are connected via the charging resistor of the charging part, and the voltage detection is performed after charging the power supply device. If the voltage value of the charging unit is within a predetermined range, the second opening / closing unit is turned on to bypass the charging resistor of the charging unit,
The power supply system according to claim 1, wherein: A notification unit for notifying the user of information,
The central control unit turns on the second opening / closing unit and notifies the notification unit that the mounting of the power supply device is completed,
The power supply system according to claim 4, wherein: A second control unit that controls the first opening / closing unit and the charging unit based on signals from the current detection unit and the voltage detection unit;
The power supply system according to claim 4 or 5, further comprising: A cooling unit that receives power supply from the power line and cools the power supply device,
The power supply system according to any one of claims 1 to 6, further comprising: A plurality of DC power supply devices for supplying DC power,
A power combiner / distributor connected to the DC power supply device for combining and distributing the DC power input from each of the DC power supply devices;
A plurality of DC / AC converters connected to the power combiner / distributor,
A plurality of DC / DC converters connected to the power combiner / distributor,
An AC device connecting portion, one of which is connected to the DC / AC converter and the other of which is connected to an AC device that supplies and receives AC power.
A DC device connecting portion, one of which is connected to the DC / DC converter and the other of which is connected to a DC device that supplies and demands DC power;
By controlling any of the power combiner / distributor, the DC / AC converter, and the DC / DC converter, the combination of DC power and the power to each of the AC device connection part and the DC device connection part are controlled. A central control unit for controlling supply and distribution,
For connecting or disconnecting the DC / AC converter, the DC / DC converter, or the AC / DC converter included in the DC power supply device to the power combiner / distributor as a power supply device A connection portion functioning as the power supply system according to claim 1.
A power supply and demand system comprising: A first terminal portion to which electric power is supplied from an electric power line;
A second terminal portion to which electric power is supplied from the first terminal portion;
A connection portion for fixing or releasing the connection between the first terminal portion and the second terminal portion,
An electric power supply device for converting electric power from the second terminal portion to supply electric power to an electric power load;
A first control unit that monitors and controls the connection state of the connection unit and the power supply state of the power supply device;
A first opening / closing part connected between the power line and the first terminal part;
A current detection unit and a voltage detection unit connected between the first opening / closing unit and the first terminal unit;
A power supply and demand method for a power supply system having a central control device for controlling them,
The central control device, when a command to open the first terminal portion and the second terminal portion is input, after stopping the power supply of the power supply device by the first control unit, the power Let the current value of the line be detected,
When the current value becomes smaller than a predetermined current value, the first opening / closing section is opened,
After opening the first opening / closing unit, the first control unit discharges,
Detecting the voltage value of the voltage detection unit after the discharge by the first control unit,
When the voltage value becomes smaller than a predetermined voltage value, it is determined that the connection portion can be released,
A power supply and demand method for a power supply system characterized by the above. The power supply system has a charging unit connected between the first switching unit and the current detection unit and the voltage detection unit,
The charging unit has a charging resistor and a second opening / closing unit,
The central control device opens the first opening / closing part when the command to connect the first terminal part and the second terminal part is input, and the voltage value of the voltage detecting part is below a predetermined voltage value. Yes, if the second opening / closing part is open,
A signal for connecting the connection unit is sent to the first control unit,
After connecting the connection unit, by connecting the first opening / closing unit, the power line and the power supply device are connected via the charging resistor of the charging unit,
If the voltage value of the voltage detection unit is within a predetermined range after charging the power supply device, the second opening / closing unit is closed to bypass the charging resistor of the charging unit.
The power supply and demand method for a power supply system according to claim 9, wherein.

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