WO2022239103A1 - Power supply system - Google Patents

Abstract

This power supply system (1) comprises: a main electrical path (10) connected to a system power supply (100); a first conversion device (211) and a second conversion device (212) for converting power; a first electrical path (11) through which a first device (401) constituting an electrical load or a power supply is connected to the first conversion device; a second electrical path (12) through which a second device (402) constituting an electrical load or a power supply is connected to the second conversion device; a first switch (311) configured so as to switch the first electrical path to a conduction state and an open state; a second switch (312) configured so as to switch the second electrical path to the conduction state and the open state; a first bypass electrical path (13); and a first bypass switch (313) configured so as to switch the first bypass electrical path to the conduction state and the open state.

Description

power supply system

The present disclosure relates to a power supply system connected to a grid power supply and forming a power distribution network for multiple power supplies or multiple electrical loads.

Conventionally, even if an abnormality occurs in some power systems among multiple power systems, the load that constitutes the power system where the abnormality occurred can be used, thereby improving reliability in the event of an abnormality. Power supply systems are known.

For example, in Patent Document 1, even if an abnormality occurs in a part of a plurality of power systems, by operating the inter-system switch and the intra-system switch, the power system in which the abnormality has occurred is configured. A power supply system is described that allows continued use of at least one of a power output and an electrical load.

JP 2019-62727 A

However, in conventional power supply systems, regardless of whether there is an abnormality in the power system, power is supplied to the load via multiple switches, resulting in large power loss at the switches. . As a result, there arises a problem that electric power cannot be used effectively.

The present disclosure has been made to solve the above problems, and aims to obtain a power supply system with high redundancy while minimizing the loss generated in the power system.

The present disclosure relates to a power supply system connected to a grid power supply and forming a power distribution network for multiple power sources or multiple electrical loads. The multiple power sources or multiple electrical loads include a first device or a second device. The power supply system includes a main electric line connected to a system power supply, a first converter and a second converter connected in parallel to the main electric line and converting electric power, and a first converter and a first device. A first electric circuit to be connected, a second electric circuit to connect the second conversion device and the second device, a first switch arranged in the first electric circuit and switched between a conductive state and an open state, and a second electric circuit. , a first bypass line connecting a second switch that switches between a conductive state and an open state, a connection node between the first device and the first switch, and a connection node between the second device and the second switch; and a first bypass switch arranged in the first bypass electric path and switched between a conductive state and an open state.

According to the present disclosure, it is possible to obtain a highly redundant power supply system while minimizing the loss generated in the power system.

1 is a configuration diagram showing a power supply system according to Embodiment 1; FIG. 3 is a diagram showing the relationship between a DC/DC converter, an open/close switch, and a bypass switch in the power supply system according to Embodiment 1; FIG. FIG. 4 is a diagram showing operations of opening/closing switches and bypass switches when an abnormality occurs in a part of the DC/DC converters of the power supply system according to Embodiment 1; It is a figure which shows the conceptual structure of the circuit of a DC/DC converter. 4 is a time chart showing the flow of processing when an abnormality is detected in the DC/DC converter; 4 is a flow chart showing a procedure of processing when an abnormality is detected in a DC/DC converter; 9 is a flow chart showing a modified example of the procedure of processing when an abnormality is detected in the DC/DC converter; It is a block diagram which shows the modification which provided the sensor which detects overcurrent in a bypass electric circuit. FIG. 10 is a configuration diagram showing a power supply system according to Embodiment 2;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. A plurality of embodiments will be described below, but appropriate combinations of the configurations described in the respective embodiments have been planned since the filing of the application. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

Embodiment 1.
<Configuration of Power Supply System 1>
FIG. 1 is a configuration diagram showing a power supply system 1 according to Embodiment 1. As shown in FIG. Power is supplied to the power supply system 1 from a system power supply 100 . System power supply 100 is, for example, an AC power supply. The power supply system 1 includes a power converter board 200 , a distribution board 300 , and a control device (central monitoring device) 50 .

An AC/DC converter 210 and a plurality of DC/ DC converters 211 and 212 are arranged on the power converter board 200 . AC/DC converter 210 converts AC power supplied from system power supply 100 into DC power. The power converter board 200 is wired with the main electric line 10 . Main electric line 10 connects system power supply 100 and AC/DC converter 210 , and connects AC/DC converter 210 and a plurality of DC/ DC converters 211 and 212 . A plurality of DC/ DC converters 211 and 212 are connected in parallel to the main electric line 10 .

A plurality of DC/ DC converters 211 and 212 are connected to various devices via a distribution board 300, respectively. FIG. 1 shows a distributed power supply 400 and an electrical load 500 as examples of various devices. Distributed power source 400 is a generic term for distributed power sources 401-404 depicted in FIG. Electrical load 500 is a generic term for electrical loads 501-504 depicted in FIG.

As shown in FIG. 1, the power supply system 1 can be conceptually partitioned into a plurality of regions 601, 602, 603, 604, . The circuit configuration of each area 601, 602, 603, 604 is common. The circuit configuration of region 601 will be described below as a representative example of the circuit configuration of regions 601, 602, 603, 604, .

The DC/DC converter 211 arranged in the area 601 is connected to the distributed power supply 401 that constitutes the storage battery by the electric line 11 passing through the power converter board 200 and the distribution board 300 . DC/DC converter 212 arranged in area 601 is connected to distributed power supply 402 that constitutes a storage battery by electric line 12 passing through power converter board 200 and distribution board 300 . Distributed power sources 401 and 402 are, for example, the same storage battery.

The DC/ DC converters 211 and 212, for example, convert the DC power from the AC/DC converter 210 into a magnitude corresponding to the distributed power sources 401 and 402. DC/DC converter 211 supplies power to distributed power supply 401 . DC/DC converter 212 supplies power to distributed power source 402 . As a result, the distributed power sources 401 and 402 that constitute the storage batteries are charged.

An open/close switch 311 is provided on the electric circuit 11 . The opening/closing switch 311 switches between a conductive state (switch ON) and an open state (switch OFF) in the electric circuit 11 . An open/close switch 312 is provided in the electric line 12 . The open/close switch 312 switches between a conductive state (switch ON) and an open state (switch OFF) in the electric path 12 . A bypass electric circuit 13 that connects the electric circuit 11 and the electric circuit 12 is provided between the electric circuit 11 and the electric circuit 12 . A bypass switch 313 is provided in the bypass electric line 13 . The bypass switch 313 switches between a conductive state (switch ON) and an open state (switch OFF) in the bypass electric line 13 .

Thus, in the area 601, the DC/ DC converters 211 and 212 for converting the power supplied from the main electric line 10 via the AC/DC converter 210 are connected in parallel to the main electric line 10. there is An open/close switch 311 is provided on the electric line 11 that connects the DC/DC converter 211 and the distributed power supply 401, and an open/close switch 312 is provided on the electric line 12 that connects the DC/DC converter 212 and the distributed power supply 402. be done. Furthermore, a bypass switch 313 is provided in the bypass electric line 13 that connects the electric lines 11 and 12 .

Areas 602 to 604 include the same circuit configuration as area 601 described so far. This embodiment shows an example in which the types of distributed power sources 400 or electric loads 500 connected to the electric lines 11 and 12 of each of the regions 601-604 are different for each of the regions 601-604. Distributed power sources 400 and electric loads 500 connected to electric lines 11 and 12 in regions 602 to 604 will be described below.

Distributed power sources 403 and 404 constituting solar cells are connected to the electric circuits 11 and 12 in the region 602 . Distributed power sources 403 and 404 are, for example, the same solar cell. DC/ DC converters 211 and 212 located in region 602 convert DC power from, for example, distributed power sources 403 and 404 into the magnitude of DC power supplied by AC/DC converter 210 .

Electric loads 501 and 502 constituting lighting are connected to the electric circuits 11 and 12 in the region 603 . Electrical loads 501 and 502 are, for example, the same lighting. The DC/ DC converters 211 and 212 arranged in the area 603 convert the DC power from the AC/DC converter 210 into magnitudes corresponding to the electric loads 501 and 502, for example.

Electric loads 503 and 504 that constitute an air conditioner are connected to the electric circuits 11 and 12 in the region 604 . Electrical loads 503 and 504 are, for example, the same air conditioner. The DC/ DC converters 211 and 212 arranged in the area 604 convert the DC power from the AC/DC converter 210 into magnitudes corresponding to the electric loads 503 and 504, for example.

In the above description, the electrical loads 501-504 are devices to which power is supplied from the system power supply 100 or distributed power supplies 401-404. Distributed power sources 403 and 404 that constitute solar cells are devices that function as power sources. Distributed power sources 401 and 402 constituting storage batteries are devices to which power for charging is supplied from sources other than system power source 100 or distributed power sources 401 to 404, and also devices that function as power sources.

For example, distributed power sources 401 and 402 that constitute storage batteries function as devices to which power is supplied from system power source 100 when power is supplied from system power source 100 to main electric line 10, and from system power source 100 It functions as a power source that supplies power to the electrical load 500 when the power supply to the main electric line 10 is interrupted.

The control device 50 includes a processor 51, a memory 52, and a communication interface (not shown). Processor 51 monitors the status of distributed power sources 400 and electrical loads 500 according to data stored in memory 52 and information obtained via a communication interface. Controller 50 may control AC/DC converter 210 and DC/ DC converters 211 and 212 . The control device 50 may also control the open/ close switches 311 and 312 and the bypass switch 313 .

The memory 52 includes, for example, ROM (Read Only Memory), RAM (Random Access Memory), and flash memory. The flash memory stores an operating system, application programs, and various data. Control device 50 is implemented by processor 51 executing an operating system and application programs stored in memory 52 . When executing the application program, the processor 51 refers to various data stored in the memory 52 .

The control device 50 may be placed near the power converter board 200 and the distribution board 300, or may be located in a remote location away from the power converter board 200 and the distribution board 300. When the control device 50 is placed in a remote location, the control device 50 may be configured to be connected to interfaces of the power converter board 200 and the distribution board 300 through a network such as the Internet.

FIG. 1 shows a configuration in which an AC/DC converter 210 and DC/ DC converters 211 and 212 are provided on a power converter board 200, and open/ close switches 311 and 312 and a bypass switch 313 are provided on a distribution board 300. rice field. However, the power converter board 200 may be provided with the open/ close switches 311 and 312 and the bypass switch 313 . Also, the power converter board 200 and the distribution board 300 may be configured on a single board.

FIG. 2 is a diagram showing the relationship between the DC/ DC converters 211 and 212, the open/ close switches 311 and 312, and the bypass switch 313 of the power supply system 1 according to the first embodiment.

In FIG. 2, dashed arrows extending from the DC/ DC converters 211 and 212 indicate open/ close switches 311 and 312 or bypass switches 313 controlled by the DC/ DC converters 211 and 212.

The switching operations of the DC/ DC converters 211 and 212 will be described using the circuit configuration of the area 601 as a representative example. The DC/DC converter 211 controls ON/OFF of the open/close switch 311 arranged on the electric line 11 . The DC/DC converter 212 controls ON/OFF of an open/close switch 312 arranged on the electric line 12 . DC/DC converter 211 and DC/DC converter 212 control ON/OFF of bypass switch 313 arranged in bypass electric line 13 .

For example, the DC/DC converter 211 switches the open/close switch 311 from ON to OFF and switches the bypass switch 313 from OFF to ON when an abnormal current such as an overcurrent is detected. When an abnormal current such as an overcurrent is detected, the DC/DC converter 212 switches the open/close switch 312 from ON to OFF and switches the bypass switch 313 from OFF to ON.

The DC/ DC converters 211, 212 arranged in each of the regions 602-604 perform the same switching operation as the DC/ DC converters 211, 212 arranged in the region 601 in each of the regions 602-604.

FIG. 3 is a diagram showing operations of the open/ close switches 311 and 312 and the bypass switch 313 when an abnormality occurs in some of the DC/ DC converters 211 and 212 of the power supply system 1 according to the first embodiment. FIG. 3 illustrates a case where an abnormality such as overcurrent occurs in the DC/DC converter 211 in the area 601 and the DC/DC converter 212 in the area 604 .

Here, the abnormalities in the DC/ DC converters 211 and 212 include, for example, overcurrent, overvoltage, undervoltage, overtemperature, and control power drop in the DC/ DC converters 211 and 212. Furthermore, an abnormality in the DC/ DC converters 211, 212 may also include a state in which the DC/ DC converters 211, 212 are disconnected from the system.

During system maintenance and maintenance, the on-off switches 311 and 312 and the bypass switch 313 may be configured so that the operator can manually switch them.

When no abnormality is detected in any of the DC/ DC converters 211 and 212 provided in the power supply system 1, for example, all the open/ close switches 311 and 312 provided in the power supply system 1 are turned on, and all the bypass switches 313 are turned on. is OFF. As a result, all the electric circuits 11 and 12 are brought into a conductive state, and current flows between the main electric circuit 10 and the distributed power sources 401 and electric loads 500 .

Even if no abnormality is detected in any of the DC/ DC converters 211 and 212, one of the open/ close switches 311 or 312 may be OFF depending on the situation. For example, when the electric load 503 is not used, the opening/closing switch 311 of the corresponding area 604 may be turned off.

However, in the following, when no abnormality is detected in any of the DC/ DC converters 211 and 212 provided in the power supply system 1, all the opening/closing switches 311 and 312 provided in the power supply system 1 are turned on, , the bypass switch 313 is turned off.

When an abnormality such as an overcurrent occurs in the DC/DC converter 211 in the area 601 and the DC/DC converter 212 in the area 604, the on-off switches 311 and 312 and the bypass switch 313 included in the power supply system 1 The state shown in FIG. 3 is obtained.

<Operation in Area 601>
First, the operation associated with an abnormality detected in DC/DC converter 211 in area 601 will be described. When an abnormality is detected in the DC/DC converter 211 in the region 601, the open/close switch 311 corresponding to the electric circuit 11 of the DC/DC converter 211 is turned from ON to OFF. This prevents the abnormal current detected by the DC/DC converter 211 from adversely affecting the distributed power supply 401 during charging. Furthermore, the bypass switch 313 corresponding to the bypass electric line 13 is turned on from off. At this time, the opening/closing switch 312 corresponding to the electric line 12 of the DC/DC converter 212 is ON. Therefore, as shown in FIG. 3 , DC power from AC/DC converter 210 is supplied from DC/DC converter 212 to distributed power supply 401 via bypass electric line 13 . Therefore, even if the DC/DC converter 211 and the distributed power supply 401 are open, power is supplied to the distributed power supply 401 via the bypass electric line 13 .

Here, when there is no abnormality in the DC/DC converter 211, the only switch involved in the path from the system power supply 100 to the distributed power supply 401 is the open/close switch 311. Further, even when an abnormality occurs in the DC/DC converter 211, the switches involved in the path from the system power supply 100 to the distributed power supply 401 via the bypass electric line 13 are the open/close switch 312 and the bypass switch 313. are only two. Therefore, according to the power supply system 1, it is possible to minimize the loss caused by the switch on the DC electric line that supplies power.

<Operation in area 604>
Operation associated with an anomaly detected in DC/DC converter 212 in region 604 will now be described. When an abnormality is detected in the DC/DC converter 212 in the region 604, the open/close switch 312 corresponding to the electric circuit 12 of the DC/DC converter 212 is turned from ON to OFF. This can prevent the abnormal current from adversely affecting the electrical load 504 . Furthermore, the bypass switch 313 corresponding to the bypass electric line 13 is turned on from off. At this time, the opening/closing switch 311 corresponding to the electric line 11 of the DC/DC converter 211 is ON. Therefore, as shown in FIG. 3 , DC power from AC/DC converter 210 is supplied to electrical load 504 from DC/DC converter 211 via bypass line 13 . Therefore, even if the DC/DC converter 212 and the electric load 504 are in an open state, power is supplied to the electric load 504 via the bypass electric line 13 .

Here, when there is no abnormality in the DC/DC converter 212 , the ON/OFF switch 312 is the only switch involved in the path from the system power supply 100 to the electric load 504 . Further, even when an abnormality occurs in the DC/DC converter 212, the switches involved in the path from the system power supply 100 to the electric load 504 via the bypass electric line 13 are the open/close switch 311 and the bypass switch 313. are only two. Therefore, according to the power supply system 1, it is possible to minimize the loss caused by the switch on the DC electric line that supplies power.

Here, the case where an abnormality is detected in the DC/DC converter 211 in the area 601 and the DC/DC converter 212 in the area 604 has been described as an example. However, the power supply system 1 operates similarly even when an abnormality is detected in the other DC/ DC converters 211 and 212 shown in FIG. For example, when an abnormality is detected in the DC/DC converter 211 in the region 602, the opening/closing switch 311 corresponding to the electric line 11 is turned from ON to OFF, and the bypass switch 313 provided in the bypass electric line 13 is turned from OFF to ON. Become. As a result, the distributed power supply 403 that constitutes the solar cell is electrically connected to the main electric line 10 via the bypass electric line 13 and the DC/DC converter 212 .

For example, when an abnormality is detected in the DC/DC converter 211 while the distributed power supply 403 is supplying power to the electric load 500, the power of the distributed power supply 403 is transferred from the bypass electric line 13 to the DC/DC converter 212. and supplied to the electric load 500 via the main electric line 10 .

4 is a diagram showing a conceptual configuration of the circuit of the DC/DC converter 211. FIG. Here, the DC/DC converter 211 will be described as a representative example. Further, FIG. 4 illustrates a case where an electric load 501 is connected to the electric line 11 and an electric load 502 is connected to the electric line 12 .

The DC/DC converter 211 includes a control section 21 , a power conversion section 22 , a current detection section 23 , a current determination section 24 and a storage section 25 . The control unit 21, the power conversion unit 22, the current detection unit 23, and the current determination unit 24 are implemented by a memory that stores programs related to processing procedures, and a processor that executes processing based on the programs. That is, the functions provided by the control unit 21 and the like are provided by, for example, software recorded in a physical memory device, a computer executing the software, hardware, a CPU (Central Processing Unit), or a combination thereof.

The power converter 22 is connected to the main electric line 10 . The power conversion unit 22 converts DC power supplied from the main electric line 10 into DC power having a magnitude corresponding to the electric load 501 . The controller 21 of the DC/DC converter 211 is configured to communicate with the controller 21 of the adjacent DC/DC converter 212 by wireless communication or the like.

The current detection section 23 detects the current output from the power conversion section 22 . The current detection section 23 transmits the detected current to the current determination section 24 . The current determination unit 24 determines whether or not the current detected by the current detection unit 23 is overcurrent. The storage unit 25 stores a first threshold value and a second threshold value for the current determination unit 24 to determine overcurrent.

The first threshold is used when the opening/closing switch 311 of the electric circuit 11 is ON and the bypass switch 313 of the bypass electric circuit 13 is OFF. In other words, the first threshold is a value corresponding to the case where the current flowing through DC/DC converter 211 is supplied only to electrical load 501 .

The second threshold is used when the open/close switch 311 of the electric line 11 is ON, the open/close switch 312 of the electric line 12 is OFF, and the bypass switch 313 of the bypass electric line 13 is ON. In other words, the second threshold is a value corresponding to the case where the current flowing through DC/DC converter 211 is supplied to electrical load 501 and electrical load 502 . The second threshold is a value that takes into consideration the magnitude of power supplied to electrical load 501 and electrical load 502 . Therefore, the second threshold is greater than the first threshold.

<When the first threshold is used>
When no abnormal current is detected in any of the DC/ DC converters 211 and 212, the open/close switch 311 of the electric line 11 is turned on, the open/close switch 312 of the electric line 12 is turned on, and the bypass switch 313 of the bypass electric line 13 is turned off. is doing. At this time, electric power is supplied to the electric load 501 through the electric line 11 and electric power is supplied to the electric load 502 through the electric line 12 .

Consider a case where an abnormal current flows through the DC/DC converter 211. In this case, the current determination unit 24 compares the current value detected by the current detection unit 23 with the first threshold, and determines that the current value detected by the current detection unit 23 exceeds the first threshold.

The current determination unit 24 transmits the determination result to the control unit 21. When receiving the overcurrent determination result from the current determination unit 24 , the control unit 21 switches the opening/closing switch 311 of the electric circuit 11 from ON to OFF. As a result, the electric path 11 is changed from the conductive state to the open state. In addition, the control unit 21 notifies the DC/DC converter 212 that the open/close switch 311 has been switched from ON to OFF. Furthermore, the control unit 21 switches the bypass switch 313 of the bypass electric line 13 from OFF to ON. Thereby, the electric circuit 11 and the electric circuit 12 are electrically connected through the bypass electric circuit 13 .

<When the second threshold is used>
Consider a case where an abnormal current flows through the DC/DC converter 212 arranged next to the DC/DC converter 211 . In this case, the DC/DC converter 211 detects an abnormality in the same procedure as the DC/DC converter 211 already described. As a result, the opening/closing switch 312 of the electric line 12 is turned off, and the bypass switch 313 of the bypass electric line 13 is turned on. At this time, the opening/closing switch 311 of the electric circuit 11 is ON.

In this case, power is supplied from the DC/DC converter 211 to the electrical load 501 , and power is supplied from the DC/DC converter 211 to the electrical load 502 via the bypass electric line 13 . In this state, DC/DC converter 211 is loaded with electric load 501 and electric load 502 . If the electric load 501 and the electric load 502 are the same, the magnitude of the current flowing through the electric path 11 is double that when the DC/DC converter 212 does not have an abnormality.

Therefore, the current determination unit 24 of the DC/DC converter 211 switches the threshold used for determination from the first threshold to the second threshold when the electric circuit 11 is electrically connected to the adjacent electric circuit 12 through the bypass electric circuit 13. Next, the current determination section 24 compares the current value detected by the current detection section 23 with the second threshold. When the current value detected by the current detection unit 23 exceeds the second threshold, the current determination unit 24 determines overcurrent.

The current determination unit 24 transmits the determination result to the control unit 21. When receiving the overcurrent determination result from the current determination unit 24 , the control unit 21 switches the opening/closing switch 311 of the electric circuit 11 from ON to OFF. As a result, the electric path 11 is changed from the conductive state to the open state. As a result, no current flows through the bypass electric line 13 that connects the electric lines 11 and 12 . Therefore, it is possible to prevent the electrical loads 501 and 502 from being adversely affected by the overcurrent.

The control unit 21 may switch the open/close switch 311 from ON to OFF and also switch the bypass switch 313 from ON to OFF. As a result, it is possible to prevent the bypass switch 313 from being kept on when the abnormal current generated in the DC/ DC converters 211 and 212 is resolved.

As described above, when the DC/DC converter 211 supplies power only to the electric load 501 , the electric load 502 corresponding to the adjacent DC/DC converter 212 via the bypass electric line 13 The threshold for judging an overcurrent is switched between when power is supplied to the

Therefore, the power supply system 1 according to this embodiment has two advantages. First, in a state where the DC/DC converter 211 is supplying power to the electrical load 501 and the DC/DC converter 212 is supplying power to the electrical load 502, the DC/ DC converters 211 and 212 are overloaded. Generation of current can be determined appropriately. Secondly, occurrence of overcurrent in the DC/DC converter 211 can be determined appropriately while the DC/DC converter 211 is supplying electric power to the electrical loads 501 and 502 .

In the description using FIG. 4, even if the DC/ DC converters 211 and 212 are interchanged, the same operations are realized in the DC/ DC converters 211 and 212. Not even. That is, the DC/DC converter 212 also has a circuit configuration similar to that of the DC/DC converter 211, and the DC/DC converter 212 detects an abnormality in the same way as the DC/DC converter 211. Operate.

Here, the case where the electrical loads 501 and 502 are connected to the DC/ DC converters 211 and 212 has been described as an example. However, the DC/ DC converters 211 and 212 operate similarly even when the distributed power sources 403 and 404 forming solar cells are connected to the DC/ DC converters 211 and 212 . In this case, the current detection unit 23 may detect an abnormality in the current output from the distributed power sources 403 and 404 .

FIG. 5 is a time chart showing the flow of processing when an abnormality is detected in the DC/DC converter 211. FIG. The flow of processing will be described below based on the time chart. Here, it is assumed that an electric load 501 is connected to the DC/DC converter 211 and an electric load 502 is connected to the DC/DC converter 212 .

The normally operating DC/DC converter 211 detects an abnormality such as overcurrent at time t1. When the DC/DC converter 211 detects an abnormality, the opening/closing switch 311 provided in the electric circuit 11 of the DC/DC converter 211 is switched from ON to OFF. As a result, the electric path 11 is changed from the conducting state to the open state. As a result, the power supply to the electrical load 501 corresponding to the DC/DC converter 211 is interrupted.

Therefore, the DC/DC converter 211 stops operating. It should be noted that the DC/DC converter 211 itself maintains an active state by being supplied with separate power not shown in FIG. Therefore, stopping the operation shown in FIG. 5 means a state in which power is not supplied from the DC/DC converter 211 to the electrical load 501 .

A minute time has passed since the open/close switch 311 was switched from ON to OFF, and it is time t2. At time t2, the bypass switch 313 is switched from OFF to ON. At time t2, the DC/DC converter 212 arranged next to the DC/DC converter 211 temporarily stops operating.

By switching the bypass switch 313 from OFF to ON, the bypass electric line 13 connects the electric line 11 of the DC/DC converter 211 and the electric line 12 of the DC/DC converter 212 arranged next to the DC/DC converter 211. Connecting. At time t3, the DC/DC converter 212 resumes operation. Thereby, the electric power supplied by the DC/DC converter 212 is supplied to the electric line 11 through the bypass electric line 13 . As a result, power is supplied to the electrical load 501 corresponding to the DC/DC converter 211 and the electrical load 502 corresponding to the DC/DC converter 212 .

In the description using FIG. 5, even if the DC/ DC converters 211 and 212 are interchanged, the same operations are realized in the DC/ DC converters 211 and 212. Not even. Further, although the DC/DC converter 212 temporarily stops operating at the time t2, the DC/DC converter 212 does not have to stop operating at the time t2.

<Flow chart showing the processing procedure of the DC/ DC converters 211 and 212>
FIG. 6 is a flow chart showing the procedure of processing when an abnormality is detected in the DC/DC converter 211 . As will be described below, when an abnormality is detected in the DC/DC converter 211, the DC/ DC converters 211 and 212 cooperate to perform processing to deal with the abnormality.

Here, the DC/DC converter 211 and the DC/DC converter 212 in the area 603 shown in FIG. 1 will be taken up as a representative example and explained.

First, the DC/DC converter 211 determines whether or not an abnormality has been detected (step S11). If an abnormality such as overcurrent is not detected (NO in step S11), DC/DC converter 211 ends the process.

When an abnormality such as overcurrent is detected (YES in step S11), the DC/DC converter 211 notifies the DC/DC converter 212 of the occurrence of the abnormality.

The DC/DC converter 212 determines whether or not there is a notification of the occurrence of an abnormality from the DC/DC converter 211 (step S21). When DC/DC converter 212 receives notification of the occurrence of an abnormality from DC/DC converter 211 (YES in step S21), DC/DC converter 212 stops operation (step S22). As a result, power supply to the electrical load 502 connected to the DC/DC converter 212 via the electric line 12 is temporarily interrupted. After that, the DC/DC converter 212 waits until receiving a notification that the bypass switch 313 is ON from the DC/DC converter 211 (step S23).

After completing the process of step S12, the DC/DC converter 211 switches the open/close switch 311 from ON to OFF (step S13). As a result, the power supply to the electric load 501 connected to the DC/DC converter 211 via the electric line 11 is cut off. As a result, the electrical load 501 is not adversely affected by overcurrent. After that, the DC/DC converter 211 switches the bypass switch 313 from OFF to ON (step S14). Next, the DC/DC converter 211 notifies the DC/DC converter 212 that the bypass switch 313 has been turned ON (step S15), and finishes the process.

When the DC/DC converter 212 receives notification that the bypass switch 313 has been turned ON (YES in step S23), it resumes operation (step S24) and finishes the process. Thereby, the electric power of the DC/DC converter 212 is supplied to the electric load 502 through the electric line 12 and is also supplied to the electric load 501 through the electric line 13 and the electric line 11 .

More specifically, the flowchart corresponding to the DC/DC converter 211 shown in FIG. 6 is executed by the controller 21 of the DC/DC converter 211. More specifically, the flowchart corresponding to the DC/DC converter 212 is executed by the controller 21 of the DC/DC converter 212 .

In the description using FIG. 6, the flow of processing when the DC/DC converter 211 detects an abnormality has been described. However, the DC/DC converter 212 has the same function as the DC/DC converter 211 and detects anomalies in the same way as the DC/DC converter 211 does. In the flow of processing when the DC/DC converter 212 detects an abnormality, the processing of the DC/DC converter 211 in FIG. This is the processing of the DC/DC converter 212 . Therefore, its description will not be repeated here.

<Modified Example of Flowchart>
FIG. 7 is a flow chart showing a modification of the procedure when an abnormality is detected in the DC/ DC converters 211 and 212. In FIG. Here, an example in which the control device 50 controls ON/OFF of the open/ close switches 311 and 312 and the bypass switch 313 will be described.

The control device 50, for example, communicates with a plurality of DC/ DC converters 211 and 212 arranged in the power supply system 1 and detects whether or not an abnormality has occurred in the DC/ DC converters 211 and 212. The control unit 21 provided in the DC/ DC converters 211 and 212 transmits abnormality information to the control device 50, for example, when detecting an abnormality in the circuits of the DC/ DC converters 211 and 212 in addition to the presence or absence of overcurrent. do. At that time, the control unit 21 also transmits identification information with which the control device 50 can identify which of the plurality of DC/ DC converters 211 and 212 is to the control device 50 .

The processing procedure of the control device 50 will be described below with reference to FIG. The control device 50 determines whether or not an abnormality has been detected in the DC/DC converter 211 (step S31). When abnormality is detected in DC/DC converter 211 (YES in step S31), operation of DC/DC converter 212 arranged in the same region as DC/DC converter 211 in which abnormality is detected is stopped. Stop (step S32). For example, when an abnormality is detected in DC/DC converter 211 in area 601 , controller 50 stops operation of DC/DC converter 212 in area 601 .

Next, the control device 50 switches from ON to OFF the open/close switch 311 provided in the electric circuit 11 of the DC/DC converter 211 in which the abnormality has been detected (step S33). Next, the control device 50 switches from OFF to ON the bypass switch 313 of the bypass electric line 13 corresponding to the electric line 11 of the DC/DC converter 211 in which the abnormality has been detected (step S34). Next, the control device 50 restarts the operation of the DC/DC converter 212, which was stopped in step S32 (step S35), and finishes the process.

The processes of steps S32, S33, S34, and S35 above are the same as the processes of steps S22, S13, S14, and S24 in FIG. 6, respectively.

If the control device 50 determines NO in step S31, it determines whether or not an abnormality has been detected in the DC/DC converter 212 (step S36). NO in step S36), the control device 50 ends the process.

When an abnormality is detected in DC/DC converter 212 (YES in step S36), operation of DC/DC converter 211 arranged in the same region as DC/DC converter 212 in which abnormality is detected is stopped. Stop (step S37). For example, when an abnormality is detected in DC/DC converter 212 in area 601 , controller 50 stops operation of DC/DC converter 211 in area 601 .

Next, the control device 50 switches from ON to OFF the open/close switch 312 provided in the electric circuit 12 of the DC/DC converter 212 in which the abnormality has been detected (step S38). Next, the control device 50 switches from OFF to ON the bypass switch 313 of the bypass electric line 13 corresponding to the electric line 12 of the DC/DC converter 212 in which the abnormality has been detected (step S39). Next, the control device 50 restarts the operation of the DC/DC converter 211, which was stopped in step S37 (step S40), and finishes the process.

The processes of steps S37, S38, S39, and S40 described above are different from the processes of steps S22, S13, S14, and S24 in FIG. is the same except that is reversed.

According to the modification shown in FIG. 7, the controller 50 can centrally monitor not only the states of the distributed power sources 400 and the electric loads 500 but also the states of the DC/ DC converters 211 and 212 .

<Modified example of thermal relay>
FIG. 8 is a configuration diagram showing a modification in which a sensor for detecting overcurrent is provided in the bypass electric line 13. As shown in FIG. In the description using FIG. 4, an example was described in which the DC/DC converter 211 determines whether or not an overcurrent has occurred while the bypass switch 313 is ON. In this modification, the bypass electric line 13 is provided with a sensor for detecting overcurrent. This sensor is composed of a thermal relay (thermal relay) 314, for example. When a current exceeding a predetermined value flows through the bypass electric path 13, the thermal relay 314 is switched from an ON state to an OFF state due to heat generated by the current.

By providing the bypass electric circuit 13 with a thermal relay 314 that reacts to a current having a magnitude corresponding to the overcurrent, the bypass electric circuit 13 physically changes from a conducting state to an open state when an overcurrent flows through the bypass electric circuit 13. . According to this modification, the DC/ DC converters 211 and 212 do not need to determine whether or not an overcurrent has occurred while the bypass switch 313 is ON. Therefore, when bypass switch 313 is ON, distributed power supply 400 or electric load 500 can be protected from overcurrent without using DC/ DC converters 211 and 212 .

As a result, the control of the power supply system 1 can be simplified. In addition, the DC/ DC converters 211 and 212 may fail due to an abnormality such as overcurrent occurring in the DC/ DC converters 211 and 212 . In this case, DC/ DC converters 211 and 212 cannot control bypass switch 313 . Even in such a case, by providing the thermal relay 314 in the bypass electric line 13, the distributed power supply 400 or the electric load 500 can be protected from overcurrent.

Therefore, the thermal relay 314 may be provided in the bypass electric line 13 while the DC/ DC converters 211 and 212 have the function of controlling the bypass switch 313 . Incidentally, the bypass switch 313 itself may be configured by the thermal relay 314 .

According to the power supply system 1 described above, even if an abnormality occurs in one of the paired DC/ DC converters 211 and 212 and the process of converting power cannot be continued, the other The process of converting power using DC/ DC converters 211 and 212 may continue. Therefore, the distributed power sources 400 connected to the power supply system 1 can be effectively used. Further, it becomes possible to continuously supply power to the electric load 500 connected to the power supply system 1 .

In the present embodiment, the technique of switching the on-off switches 311 and 312 and the bypass switch 313 by detecting the occurrence of an abnormality in the DC/ DC converters 211 and 212 has been described. However, the open/ close switches 311 and 312 and the bypass switch 313 may be configured to be turned ON/OFF by human operation.

As a result, maintenance of the power supply system 1 can be performed without stopping the services for the distributed power sources 400 and the electric loads 500 . Moreover, even if it becomes necessary to replace one of the DC/DC converter 211 and the DC/DC converter 212 as a result of the inspection, the equipment can be replaced without affecting the distributed power supply 400 and the electric load 500. can be done. Therefore, according to the power supply system 1, it is possible to provide a system that can prevent deterioration of reliability as much as possible.

Embodiment 2.
<Configuration of Power Supply System 2>
Next, Embodiment 2 will be described. FIG. 9 is a configuration diagram showing a power supply system 2 related to Embodiment 2. As shown in FIG. In Embodiment 1, a DC power distribution network is used to convert AC power supplied from system power supply 100 to DC power, but in Embodiment 2, electric load 500 is provided in an AC power distribution network.

In the second embodiment, the electric load 500 is supplied with AC power from the system power supply 100 . In this respect, the second embodiment differs from the first embodiment. Furthermore, in the second embodiment, one AC/DC converter 221 is connected corresponding to one DC/DC converter 211, and one AC/DC converter 221 is connected corresponding to one DC/DC converter 212. 222 is connected.

As shown in FIG. 9, the power supply system 2 conceptually includes a plurality of regions 611, 612, . can be divided into The circuit configuration of region 611 will be described below as a typical example of the circuit configuration of regions 611, 612, .

The DC/DC converters 211 in area 611 are arranged on the power converter board 201 along with the corresponding AC/DC converters 221 . DC/DC converters 212 in region 611 are located on power converter board 202 along with corresponding AC/DC converters 222 .

The AC/DC converter 221 and the DC/DC converter 211 arranged on the power converter board 201 are connected by an electric line 11 branching from the main electric line 10 . Electric circuit 11 further extends from DC/DC converter 211 through distribution board 300 to distributed power supply 401 .

The AC/DC converter 222 and the DC/DC converter 212 arranged on the power converter board 202 are connected by the electric line 12 branching from the main electric line 10 . Electrical path 12 further extends from DC/DC converter 212 through distribution board 300 to distributed power supply 402 .

As in the first embodiment, the electric line 11 is provided with an open/close switch 311 and the electric line 12 is provided with an open/close switch 312 . As in the first embodiment, the bypass electric line 13 is connected between the electric lines 11 and 12 and the bypass switch 313 is provided in the bypass electric line 13 .

In the power supply system 2 according to the second embodiment, similar to the power supply system 1 according to the first embodiment, the DC/ DC converters 211 and 212 cooperate to execute processing when an abnormality occurs. As a result, for example, when an overcurrent is detected in DC/DC converter 211 in region 611, open/close switch 311 switches from ON to OFF, and bypass switch 313 switches from OFF to ON. As a result, overcurrent does not flow through the distributed power sources 401 . Power is supplied to the distributed power supply 401 from the DC/DC converter 212 via the bypass electric line 13 .

Similarly, when an overcurrent is detected in the DC/DC converter 211 in the area 612, the open/close switch 311 is switched from ON to OFF, and the bypass switch 313 is switched from OFF to ON. As a result, the distributed power supply 403 that constitutes the solar cell is electrically connected to the main electric line 10 via the bypass electric line 13 , the DC/DC converter 212 and the AC/DC converter 222 .

When an abnormality is detected in the DC/DC converter 211 while the distributed power supply 403 is supplying power to the electric load 500, the power of the distributed power supply 403 is transferred from the bypass electric line 13 to the DC/DC converter 212, AC /DC converter 222 and main electric line 10 to electric load 500 .

According to the power supply system 2 according to the second embodiment, the electric load 500 is supplied with AC power from the system power supply 100 . Therefore, it is not necessary to provide the DC/ DC converters 211 and 212 individually for the electrical loads 501, 502, 503 and 504, respectively. As a result, it is not necessary to provide the bypass electric line 13 and the bypass switch 313 as shown in FIG. Also, the AC/DC converter 210 that handles the total power supply capacity of the power supply system can be reduced. Therefore, according to the power supply system 2 according to the second embodiment, the size of the power supply system can be reduced.

In the power supply system 2, the AC/ DC converters 221 and 222 may have a function of detecting anomalies, similar to the DC/ DC converters 211 and 212. For example, AC/ DC converters 221 and 222 may have a circuit configuration similar to that of DC/DC converter 211 shown in FIG. In this case, the AC/ DC converters 221 and 222 may switch and control the open/ close switches 311 and 312 and the bypass switch 313 in the same manner as the DC/ DC converters 211 and 212 when overcurrent is detected. Further, the control device 50 may apply the processing based on the flowchart shown in FIG. 7 to the AC/ DC converters 221 and 222.

As described above, in the power supply systems 1 and 2 according to the first and second embodiments, the opening/closing switch 311 is connected between at least one of the distributed power sources 400 such as storage batteries and solar cells and between the electric loads 500 . , 312 and a bypass switch 313 are provided. As a result, even if the DC/ DC converters 211 and 212 fail, the distributed power supply 400 can be effectively used and the electric load 500 can continue to operate.

In addition, when there is no abnormality in the DC/ DC converters 211 and 212, the ON/OFF switch 311 is the only switch involved in the path from the system power supply 100 to the distributed power supply 400 or the electric load 500. Further, even when an abnormality occurs in either the DC/DC converter 211 or the DC/DC converter 212, the path from the system power supply 100 to the distributed power supply 400 or the electric load 500 via the bypass electric line 13 Only two switches are involved: the on/off switch 312 and the bypass switch 313 . Therefore, it is possible to minimize the loss caused by the switch on the direct-current electric line that supplies electric power.

Therefore, according to Embodiments 1 and 2, it is possible to provide highly redundant power supply systems 1 and 2 that enable effective use of supplied power and continuous operation of electric load 500 .

In Embodiments 1 and 2, an AC system power supply is given as an example of the system power supply 100 . However, the system power supply 100 may be a DC system power supply. In this case, for example, AC/DC converter 210 in FIG. 1 may not be provided.

(summary)
The above embodiments will be summarized with reference to the drawings again.

(1) The present disclosure relates to a power supply system (1, 2) connected to a grid power supply (100) and forming a power distribution network for a plurality of power sources (400) or a plurality of electrical loads (500). The multiple power sources or multiple electrical loads include a first device or a second device. The power supply system includes a main electric line (10) connected to a system power supply, a first conversion device (211) and a second conversion device (212) connected in parallel to the main electric line and converting electric power, and a second A first electric line (11) connecting the first conversion device and the first device (401, 403, 501, 503), and a second connecting the second conversion device and the second device (402, 404, 502, 504) 2 electrical paths (12), a first switch (311) arranged in the first electrical path and switching between a conducting state and an open state, and a second switch (312) arranged in the second electrical path and switching between a conducting state and an open state. ), a connection node between the first device and the first switch and a connection node between the second device and the second switch; and a first bypass switch (313) that switches between a conducting state and an open state.

(2) The power supply system switches the first switch from the conducting state to the open state and switches the first bypass switch from the open state to the conducting state when an abnormality occurs in the first converter (21, 50 ) is further provided.

(3) After stopping the operation of the second conversion device, the control device switches the first bypass switch from the open state to the conducting state, and after switching the first bypass switch from the open state to the conducting state, the second conversion device Operation is resumed (FIG. 5, steps S32 to S35, steps S37 to S40).

(4) If the output current exceeds the threshold, the first converter determines that an abnormality has occurred (step S11, FIG. 4). is set to a first threshold, and if the first bypass switch is conductive, the threshold is set to a second threshold that is greater than the first threshold (FIG. 4).

(5) The power supply system further includes a sensor (314) that detects overcurrent flowing through the first bypass electric circuit.

(6) In the power supply system, the sensor is composed of a thermal relay (314).

(7) The system power supply is an AC system power supply, and further includes an AC/DC converter (210) that is arranged in the main electric circuit and converts the AC power of the system power supply into DC power. a first DC/DC conversion device (211) for converting DC power converted by the DC conversion device into DC power corresponding to the first device; It consists of a second DC/DC conversion device (212) that converts the electrical power into DC power corresponding to the second device.

(8) The system power supply is the power supply of the AC system. a second AC/DC converter (222) disposed between the electrical path and the second converter for converting AC power to DC power, the first converter being converted by the first AC/DC converter; a first DC/DC conversion device (211) that converts the DC power into DC power corresponding to the first device, and the second conversion device converts the DC power converted by the second AC/DC conversion device to the second device It is composed of a second DC/DC converter (212) that converts to DC power corresponding to .

(9) The power supply system consists of a group of a first conversion device, a second conversion device, a first electric circuit, a second electric circuit, a first bypass electric circuit, a first switch, a second switch, and a first bypass switch. Sometimes there are multiple groups of configurations (regions 601-604, 611, 612).

(10) The first device and the second device constitute a plurality of power sources (401 to 404), further comprise a third device (501) and a fourth device (502) that constitute a plurality of electrical loads, and a third conversion device (DC/DC converter 211 in region 603) and a fourth conversion device (DC/DC converter 212 in region 603) connected in parallel to each other and converting power; 3 device (the electric circuit 11 in the region 603), the fourth electric circuit (the electric circuit 12 in the region 603) that connects the fourth conversion device and the fourth device, and the A third switch (the open/close switch 311 in the region 603) that switches between the state and the open state, a fourth switch (the open/close switch 312 in the region 603) that is arranged in the fourth electrical path and switches between the conducting state and the open state, and the third switch (the open/close switch 312 in the region 603) a second bypass line (bypass line 13 in region 603) connecting a connection node between the device and the third switch and a connection node between the fourth device and the fourth switch; and a second bypass switch (bypass switch 313 in region 603) that switches between a conducting state and an open state.

The embodiments disclosed this time should be considered illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the scope of the claims rather than the description of the above-described embodiments, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1, 2 power supply system, 10 main electric circuit, 11, 12 electric circuit, 13 bypass electric circuit, 21 control unit, 22 power conversion unit, 23 current detection unit, 24 current determination unit, 25 storage unit, 50 control device, 51 processor, 52 memory, 100 system power supply, 200 to 202 power converter board, 210, 221, 222 AC/DC converter, 211, 212 DC/DC converter, 300 distribution board, 311, 312 open/close switch, 313 bypass switch, 314 thermal relay, 400-404 distributed power supply, 500-504 electric load, 601-604, 611, 612 area.

Claims (10)

1. A power supply system connected to a system power supply and forming a distribution network for a plurality of power sources or a plurality of electrical loads,
   wherein said plurality of power sources or said plurality of electrical loads comprise a first device or a second device;
   a main electric circuit connected to the system power supply;
   A first conversion device and a second conversion device connected in parallel to the main electrical circuit and converting power;
   a first electrical path connecting the first conversion device and the first device;
   a second electric circuit connecting the second conversion device and the second device;
   a first switch that is arranged in the first electrical path and switches between a conductive state and an open state;
   a second switch arranged in the second electrical path and switched between a conducting state and an open state;
   a first bypass electric line connecting a connection node between the first device and the first switch and a connection node between the second device and the second switch;
   A power supply system comprising: a first bypass switch arranged in the first bypass circuit and switched between a conductive state and an open state.
2. 2. The control device according to claim 1, further comprising a control device that switches said first switch from a conductive state to an open state and switches said first bypass switch from an open state to a conductive state when an abnormality occurs in said first conversion device. power supply system.
3. The control device switches the first bypass switch from an open state to a conductive state after stopping the operation of the second conversion device, and switches the first bypass switch from the open state to the conductive state before the second conversion. 3. The power supply system of claim 2, which resumes operation of the device.
4. The first conversion device determines that the abnormality has occurred when the output current exceeds a threshold,
   The first conversion device sets the threshold to a first threshold when the first bypass switch is in an open state, and sets the threshold to be higher than the first threshold when the first bypass switch is in a conducting state. 4. The power supply system according to claim 2 or 3, wherein a large second threshold is set.
5. The power supply system according to any one of claims 1 to 4, further comprising a sensor that detects overcurrent flowing through the first bypass electric circuit.
6. The power supply system according to claim 5, wherein the sensor is configured by a thermal relay.
7. The system power supply is an AC system power supply,
   Further comprising an AC/DC converter arranged in the main electric circuit for converting AC power of the system power supply to DC power,
   The first conversion device comprises a first DC/DC conversion device that converts the DC power converted by the AC/DC conversion device into DC power corresponding to the first device,
   The second conversion device is configured by a second DC/DC conversion device that converts the DC power converted by the AC/DC conversion device into DC power corresponding to the second device. 7. The power supply system according to any one of 6.
8. The system power supply is an AC system power supply,
   a first AC/DC converter arranged between the main electric circuit and the first converter for converting AC power of the system power supply into DC power;
   A second AC/DC converter disposed between the main electric circuit and the second converter for converting the AC power to the DC power,
   The first conversion device comprises a first DC/DC conversion device that converts the DC power converted by the first AC/DC conversion device into DC power corresponding to the first device,
   The second converter is configured by a second DC/DC converter that converts the DC power converted by the second AC/DC converter into DC power corresponding to the second device. Item 7. The power supply system according to any one of Items 6.
9. The first conversion device, the second conversion device, the first electric line, the second electric line, the first bypass electric line, the first switch, the second switch, and the first bypass switch are configured as a group. A power supply system according to any preceding claim, sometimes comprising a plurality of said group of configurations.
10. the first device and the second device constitute the plurality of power sources;
    Further comprising a third device and a fourth device that configure the plurality of electrical loads,
    A third conversion device and a fourth conversion device connected in parallel to the main electrical circuit and converting power;
    a third cable connecting the third conversion device and the third device;
    a fourth cable connecting the fourth conversion device and the fourth device;
    a third switch arranged in the third electrical path and switched between a conductive state and an open state;
    a fourth switch arranged in the fourth electrical path and switched between a conducting state and an open state;
    a second bypass electric line connecting a connection node between the third device and the third switch and a connection node between the fourth device and the fourth switch;
    10. The power supply system according to any one of claims 1 to 9, further comprising a second bypass switch that is arranged in the second bypass line and switches between a conducting state and an open state.

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