Power storage system for systems

Abstract

To provide a technique for enabling stored power of a storage battery for systems to be utilized even when an abnormality occurs in a system.SOLUTION: A power storage system for systems comprises: a storage battery for systems which is electrically connected with a system; a first breaker which is provided on first wiring electrically connecting the system and the storage battery for systems, conducts and breaks the first wiring; bypass connection wiring branched from the first wiring and connected to second wiring electrically connecting a power demand facility and the system; and a bypass breaker which is provided on the bypass connection wiring, and conducts and breaks the bypass connection wiring. A second breaker which conducts and breaks the second wiring is provided on the second wiring. The bypass connection wiring is connected at an anti-system side of the first breaker or the second breaker in each of the first wiring and the second wiring.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a power storage system for a grid. [Background technology]

[0002] In Japan, in order to achieve carbon neutrality by 2050, the development of a next-generation power network that will enable the large-scale introduction of renewable energy (hereinafter simply referred to as renewable energy) while ensuring a stable supply of electricity is being considered (see Non-Patent Document 1).

[0003] Renewable energy is easily affected by factors such as the season and weather. In order to expand the introduction of renewable energy, a decarbonized adjustment capacity that can absorb these fluctuations is necessary. Non-Patent Document 1 lists grid storage batteries (large-scale stationary storage batteries connected to the grid) as a candidate for decarbonized adjustment capacity. With regard to grid storage batteries, the development of related legislation is also progressing, and rapid spread is expected. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Handouts for the 47th meeting of the Energy Conservation and New Energy Subcommittee / Electricity and Gas Business Subcommittee on Large-Scale Introduction of Renewable Energy and Next-Generation Electricity Networks, held on December 6, 2022, Resources and Energy Advisory Committee, Material 1: "Next-Generation Electricity Networks" Summary of the Invention [Problem to be solved by the invention]

[0005] The grid storage battery is connected to a grid (power grid) provided by a general electricity transmission and distribution company, and is charged (forward current) and discharged (reverse current) through the grid. Therefore, if an abnormality such as a large-scale power outage occurs in the grid due to a natural disaster, for example, the grid storage battery will not be able to function. Therefore, in a situation of a large-scale power outage, there is a concern that while there are power demand facilities that are in difficulty due to the loss of power supply, even if sufficient power is stored in the grid storage battery installed nearby, the power stored in the grid storage battery will not be able to be used.

[0006] In view of the above, this specification provides a technique that makes it possible to utilize the stored power of a system storage battery even when an abnormality occurs in the system. [Means for solving the problem]

[0007] The technology disclosed in this specification is embodied in a power grid storage system. The system includes a power grid storage battery electrically connected to the power grid, a first circuit breaker provided on a first wiring electrically connecting the power grid and the power grid storage battery and for connecting and disconnecting the first wiring, a bypass connection wiring branched from the first wiring and connected to a second wiring electrically connecting an electric power demand facility and the power grid, and a bypass circuit breaker provided on the bypass connection wiring and for connecting and disconnecting the bypass connection wiring. A second circuit breaker is provided on the second wiring and for connecting and disconnecting the second wiring. The bypass connection wiring is connected to the first wiring and the second wiring on the opposite side to the power grid from the first circuit breaker or the second circuit breaker.

[0008] In the above-described configuration, under normal circumstances, the first circuit breaker is brought into conduction, thereby electrically connecting the grid storage battery to the grid. As a result, the grid storage battery is charged and discharged via the grid, and functions as a regulating power for the grid. At the power demanding facility, the third circuit breaker is also brought into conduction, thereby electrically connecting the power demanding facility to the grid. As a result, the power demanding facility can receive power supply via the grid. In this way, under normal circumstances, the grid storage system and the power demanding facility are each electrically connected to the grid. Therefore, under normal circumstances, the second circuit breaker is shut off.

[0009] On the other hand, when an abnormality such as a large-scale power outage occurs in the grid due to, for example, a natural disaster, the first circuit breaker can be shut off to electrically disconnect the grid storage system from the grid. Similarly, in the power demand facility, the third circuit breaker can be shut off to electrically disconnect the power demand facility from the grid. In this state, when the second circuit breaker is turned on, the grid storage system is electrically connected to the power demand facility directly (i.e., not via the grid) via the bypass connection wiring. This makes it possible to supply power stored in the grid storage battery to the power demand facility even when the grid is unavailable. [Brief description of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a configuration of a power storage system for a grid 10 according to a first embodiment. [Diagram 2] The operation of the grid storage system 10 when an abnormality occurs in the grid 2 will be described. [Diagram 3] 1 shows how the grid storage system 10 supplies power to a power demanding facility 30 under normal circumstances. [Figure 4] FIG. 11 is a block diagram showing the configuration of a grid power storage system 110 according to a second embodiment. [Diagram 5] FIG. 11 is a block diagram showing the configuration of a grid storage system 210 according to a third embodiment. [Figure 6] FIG. 1 is a diagram for explaining a modified example of Example 1-3, showing a solar panel 54 added to the system 10. The illustration of the power demanding facility 30 is omitted. [Figure 7] FIG. 1 is a diagram for explaining a modified example of Example 1-3, showing an EV charger 58 added to an electricity demanding facility 30. The illustration of the grid power storage system 10 is omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In one embodiment of the present technology, the first wiring on the grid storage system side may be provided with a first transformer located in a section between the first circuit breaker and the grid storage battery. Similarly, the second wiring on the power demanding facility side may be provided with a second transformer located in a section between the second circuit breaker and the grid storage battery. In this case, the bypass connection wiring may be connected to the first wiring and the second wiring on the grid side of the first transformer or the second transformer. With this configuration, the bypass connection wiring transmits AC power at a high voltage in the same manner as the grid, so that the transmission loss in the bypass connection wiring can be suppressed. In addition, the grid storage system can supply power to the power demanding facility in the same manner as when supplying power to the grid under normal circumstances. In addition, the power demanding facility can receive power from the grid storage system in the same manner as when receiving power from the grid under normal circumstances.

[0012] In one embodiment of the present technology, the first wiring on the grid storage system side may be provided with a first transformer located in a section between the first circuit breaker and the grid storage battery, and a first power conditioner located in a section between the first transformer and the grid storage battery. Also, the second wiring on the power demanding facility side may be provided with a second transformer located in a section between the second circuit breaker and the power demanding facility. In this case, the bypass connection wiring may be branched off from a section between the first transformer and the first power conditioner in the first wiring. And, the bypass connection wiring may be connected to a section between the second transformer and the power demanding facility in the second wiring on the power demanding facility side. According to such a configuration, the bypass connection wiring transmits AC power at a lower voltage than the grid, so that the configuration of the bypass connection wiring can be simplified.

[0013] In one embodiment of the present technology, the first wiring on the grid storage system side may be provided with a first transformer located in a section between the first circuit breaker and the grid storage battery, and a first power conditioner located in a section between the first transformer and the grid storage battery. The second wiring on the power demanding facility side may be provided with a second transformer located in a section between the second circuit breaker and the power demanding facility, and a DC power source may be connected to the section between the second transformer and the power demanding facility via the second power conditioner. In this case, the bypass connection wiring may be branched from the section between the first power conditioner and the grid storage battery in the first wiring on the grid storage system side. Then, the bypass connection wiring may be connected to the section between the second transformer and the power demanding facility via the second power conditioner in the second wiring on the power demanding facility side. In this way, in the bypass connection wiring, power from the grid storage battery may be transmitted as DC power as it is (or after being transformed as necessary).

[0014] In one embodiment of the present technology, the grid storage system may further include a vehicle charging device connected to the grid storage battery. In this case, the vehicle charging device may be configured to charge the electric vehicle using the power stored in the grid storage battery. With this configuration, even when an abnormality occurs in the grid, the electric vehicle can be charged using the power stored in the grid storage battery. The power stored in the electric vehicle can be used not only to be consumed by the electric vehicle but also to supply power to a residence (so-called V2H: Vehicle to Home). In this way, when a large-scale power outage occurs, for example, power can be supplied not only to a power demand facility connected via the bypass connection wiring but also to unspecified homes via the electric vehicle.

[0015] In one embodiment of the present technology, the grid storage system may further include a control device that controls the operation of the bypass circuit breaker. In this case, the control device may be configured to prohibit the bypass circuit breaker from being conductive when at least one of the first circuit breaker and the second circuit breaker is conductive. With this configuration, when power is supplied from the grid storage system to a power demand facility, it is possible to avoid unintentional supply of power to a grid in which an abnormality is occurring.

[0016] In one embodiment of the present technology, the first transformer and / or the first power conditioner may be configured to operate using power stored in the grid storage battery when the first circuit breaker cuts off the first wiring. With this configuration, even when an abnormality occurs in the grid, the first transformer and / or the first power conditioner can be operated to reliably supply power from the grid storage system to the power demanding facility. However, in another embodiment, the first transformer and / or the first power conditioner may include a self-power source such as another storage battery or a solar panel. EXAMPLES

[0017] Example 1 A grid power storage system 10 (hereinafter, abbreviated as system 10) of Example 1 will be described with reference to the drawings. The system 10 of this example is provided on the same premises as, or adjacent to, a relatively large facility 30, such as a factory, warehouse, airport, school, hospital, administrative facility, or large retail store. These facilities 30 are facilities that receive power supply from a grid 2, and are referred to as power demanding facilities 30 in this specification. The power demanding facilities 30 are connected to the grid 2 via a second transformer 34. The power demanding facilities 30 may also be provided with various power sources such as a storage battery 42 and a solar panel 44, and a second power conditioner 36 required for these power sources. The grid 2 is a grid (power grid) provided by a general electricity transmission and distribution company.

[0018] As shown in Fig. 1, the system 10 includes a grid storage battery 12, a first transformer 14, and a first power conditioner 16. The grid storage battery 12 is connected to a grid 2 via a first wiring 18. The first wiring 18 is provided with the first transformer 14 and the first power conditioner 16. The first transformer 14 is connected to the grid 2, and the first power conditioner 16 is interposed between the first transformer 14 and the grid storage battery 12.

[0019] The system storage battery 12 is a stationary storage battery. The system storage battery 12 functions as a regulating power for the system 2 by being charged and discharged via the system 2. The system storage battery 12 is expected to be widespread as a deoxidizing type regulating power, together with pumped storage power generation, for example. The system storage battery 12 has a relatively large rated output and storage capacity, and can have a rated output of 10 megawatts (MW) or more and a storage capacity of 100 megawatt hours (MWh) or more, for example. The specific configuration of the system storage battery 12 is not particularly limited. For example, the battery constituting the system storage battery 12 may be any one of a lithium ion battery, an all-solid-state battery, a sodium-sulfur battery (NAS battery: registered trademark), etc., or a combination thereof.

[0020] When the system 10 stores power, the first transformer 14 steps down the AC power from the grid 2 and outputs it to the first power conditioner 16. Then, the first power conditioner 16 converts the AC power from the first transformer 14 into DC power and outputs it to the grid storage battery 12. As a result, the power from the grid 2 is stored in the grid storage battery 12. On the other hand, when the system 10 supplies power, the first power conditioner 16 converts the DC power from the grid storage battery 12 into AC power and outputs it to the first transformer 14. Then, the first transformer 14 steps up the AC power from the first power conditioner 16 and outputs it to the grid 2. As a result, the power from the grid storage battery 12 is supplied to the grid 2.

[0021] The system 10 further includes a first circuit breaker 20. The first circuit breaker 20 is provided in the first wiring 18 between the first transformer 14 and the system 2, and electrically connects and disconnects the first transformer 14 and the system 2. The system 2 in this embodiment is a special high voltage system. Therefore, in the first wiring 18, a section 18a between the system 2 and the first transformer 14 is also a special high voltage wiring like the system 2. However, the voltage of the system 2 is not particularly limited. Under normal circumstances, the first wiring 18 is connected by the first circuit breaker 20, and the system 10 is electrically connected to the system 2 (see FIG. 1). However, as shown in FIG. 2, when a large-scale power outage or other abnormality occurs in the system 2, the first wiring 18 is interrupted by the first circuit breaker 20, and the system 10 is electrically disconnected from the system 2. Note that the operation of the first circuit breaker 20 at this time may be automatically controlled by the system 2 or may be automatically controlled by the system 10. Alternatively, the operation of the first circuit breaker 20 may be manually controlled by an operator having the authority to do so.

[0022] The system 10 further includes a bypass connection wiring 22 and a bypass circuit breaker 24 provided on the bypass connection wiring 22. The bypass connection wiring 22 branches off from the first wiring 18 and is connected to a second wiring 38. The second wiring 38 is a wiring that connects between the power demanding facility 30 and the system 2, and is a path for supplying power from the system 2 to the power demanding facility 30. A second transformer 34 and a second circuit breaker 40 are provided on the second wiring 38. Similar to the first transformer 14, the second transformer 34 steps down the AC power from the system 2 and supplies it to the power demanding facility 30.

[0023] The second circuit breaker 40 is provided in the second wiring 38 between the second transformer 34 and the system 2, and electrically connects and disconnects the second transformer 34 and the system 2. Normally, the second wiring 38 is connected by the second circuit breaker 40, and the power demanding facility 30 is electrically connected to the system 2 (see FIG. 1). However, as shown in FIG. 2, when a large-scale power outage or other abnormality occurs in the system 2, the second wiring 38 is disconnected by the second circuit breaker 40, and the power demanding facility 30 is electrically disconnected from the system 2. Note that the operation of the second circuit breaker 40 at this time may be automatically controlled by the system 2 or may be automatically controlled by the power demanding facility 30. Alternatively, the operation of the second circuit breaker 40 may be manually managed by an operator having the authority to do so.

[0024] Under normal circumstances, the bypass connection wiring 22 is interrupted by the bypass circuit breaker 24, and the system 10 and the power demanding facility 30 are connected to each other only via the system 2 (see FIG. 1). However, as shown in FIG. 2, when a large-scale power outage or other abnormality occurs in the system 2, the second wiring 38 is made conductive by the bypass circuit breaker 24, and the system 10 and the power demanding facility 30 are directly connected (i.e., not via the system 2). In particular, the bypass connection wiring 22 is connected to the first wiring 18 and the second wiring 38 on the opposite system side (i.e., the opposite side to the system 2) of the first circuit breaker 20 or the second circuit breaker 40. As a result, the bypass connection wiring 22 can directly connect the system 10 and the power demanding facility 30 in a state in which both the system 10 and the power demanding facility 30 are electrically disconnected from the system 2.

[0025] As described above, according to the system 10 of the present embodiment, when an abnormality such as a large-scale power outage occurs in the grid 2 due to, for example, a natural disaster, the first circuit breaker 20 is shut off, so that the grid storage system 10 can be electrically disconnected from the grid 2. Similarly, in the power demanding facility 30, the second circuit breaker 40 is shut off, so that the power demanding facility 30 is electrically disconnected from the grid 2. In this state, when the bypass circuit breaker 24 of the bypass connection wiring 22 is brought into conduction, the system 10 is electrically connected to the power demanding facility 30 via the bypass connection wiring 22. As a result, even in a situation in which the grid 2 is unavailable, the power stored in the grid storage battery 12 can be supplied to the power demanding facility 30.

[0026] In the power demanding facility 30, the power supplied from the grid storage battery 12 can be used in various ways. For example, the power supplied from the grid storage battery 12 may be used in the entire power demanding facility 30, or may be used in a limited manner only in a part of the power demanding facility 30. According to the latter aspect, for example, by supplying power only to essential or important equipment in the power demanding facility 30, it becomes possible to maintain the minimum necessary functions required for the power demanding facility 30 for a long period of time.

[0027] The operation of the bypass circuit breaker 24 may be automatically controlled by the system 10, or may be manually managed by an operator having the authority to do so. In this regard, the system 10 of this embodiment further includes a control device 26 that controls the operation of the bypass circuit breaker 24. The control device 26 monitors the states of the first circuit breaker 20 and the second circuit breaker 40, and is configured to prohibit the bypass circuit breaker 24 from being conductive when at least one of the circuit breakers 20 and 40 is conductive. In other words, even if an operator performs an operation to turn on the bypass circuit breaker 24, if at least one of the first circuit breaker 20 and the second circuit breaker 40 is conductive, the control device 26 prohibits the bypass circuit breaker 24 from being conductive. As an example, the control device 26 may be further configured to detect when both the first circuit breaker 20 and the second circuit breaker 40 are cut off and automatically turn on the bypass circuit breaker 24.

[0028] The position where the bypass connection wiring 22 branches off from the first wiring 18 and the position where the bypass connection wiring 22 is connected to the second wiring 38 are not particularly limited. As an example, in the system 10 of the present embodiment, the bypass connection wiring 22 is connected to each of the first wiring 18 and the second wiring 38 closer to the grid 2 than the first transformer 14 or the second transformer 34. With this configuration, the bypass connection wiring 22 transmits AC power at a high voltage in the same manner as the grid 2, so that the transmission loss in the bypass connection wiring 22 can be suppressed. In addition, the system 10 can supply power to the power demanding facility 30 in the same manner as when supplying power to the grid 2 under normal circumstances. In addition, the power demanding facility 30 can receive power from the system 10 in the same manner as when receiving power from the grid 2 under normal circumstances.

[0029] In the system 10 of this embodiment, each component such as the first transformer 14, the first power conditioner 16, and the control device 26 is configured to operate using power stored in the grid storage battery 12. This allows the system 10 to continue its operation even when the first wiring 18 is cut off by the first circuit breaker 20 and power supply from the grid 2 is lost. However, each component of the system 10 may be provided with its own power source such as a storage battery or a solar panel in addition to the grid storage battery 12. Also, each component of the system 10 may be configured to operate using power supplied from the grid 2 during normal times.

[0030] As an example, the system 10 of the present embodiment further includes an EV charger 28. The EV charger 28 is a DC charger that is connected to the grid storage battery 12 and can charge an electric vehicle (not shown) using the power stored in the grid storage battery 12. The power charged to the electric vehicle is not only consumed by the electric vehicle, but can also be used to supply power to a residence (so-called V2H: Vehicle to Home) by connecting the electric vehicle to a residence. As a result, when a large-scale power outage occurs, for example, power can be supplied via the electric vehicle not only to a specific power demand facility 30 connected via the bypass connection wiring 22 but also to unspecified homes located away from the system 10.

[0031] As shown in FIG. 3, the system 10 of the present embodiment may supply power to the power demanding facility 30 via the bypass connection wiring 22 even during normal times when the system 2 is not affected. In this case, the power demanding facility 30 receives power from both the system 2 and the system 10, and therefore the amount of power supplied from the system 2 can be reduced by the amount of power supplied from the system 10. In general, the amount of power consumed by the power demanding facility 30 varies greatly depending on the season, and the contract power is determined with the provider of the system 2 (i.e., a general power transmission and distribution company, etc.) according to the amount of power consumed during the peak period of the year. Therefore, the power demanding facility 30 can lower the contract power (i.e., the contract fee) by receiving power supply from the system 10 and reducing the amount of power consumed during the peak period. When the operation of this mode is performed, the control device 26 may be changed so as to allow the bypass circuit breaker 24 to be conductive even when the second circuit breaker 40 is conductive.

[0032] (Example 2) A grid storage system 110 (hereinafter, abbreviated as system 110) of Example 2 will be described with reference to Fig. 4. The system 110 of this example is different from the system 10 of Example 1 in that the position of the bypass connection wiring 22 is changed. Other configurations of this example are the same as or correspond to the system 10 of Example 1, and therefore the same reference numerals are used to omit redundant description.

[0033] 4, the bypass connection wiring 22 in this embodiment branches off from a section 18b between the first transformer 14 and the first power conditioner 16 in the first wiring 18 on the system 110 side. The bypass connection wiring 22 is connected to a section 38b between the second transformer 34 and the power demanding facility 30 in the second wiring 38 on the power demanding facility 30 side. With this configuration, the bypass connection wiring 22 transmits AC power at a lower voltage than the system 2. Therefore, the voltage resistance required for the bypass connection wiring 22 is relaxed, and the configuration of the bypass connection wiring 22 can be simplified.

[0034] Third Embodiment A grid storage system 210 (hereinafter, abbreviated as system 210) of a third embodiment will be described with reference to Fig. 5. In the system 210 of this embodiment, the position of the bypass connection wiring 22 is changed compared to the system 10 of the first embodiment. Other configurations of this embodiment are the same as or correspond to the system 10 of the first embodiment, so that the same reference numerals are used to omit redundant description.

[0035] As shown in FIG. 5, the bypass connection wiring 22 in this embodiment branches off from a section 18c between the first power conditioner 16 and the grid storage battery 12 in the first wiring 18 on the system 210 side. The bypass connection wiring 22 is connected to a DC wiring 38c that connects between the second power conditioner 36 and the storage battery 42, etc., in the power demanding facility 30. As a result, the bypass connection wiring 22 is connected to the second wiring 38 (particularly, the section 38b between the second transformer 34 and the power demanding facility 30) via the second power conditioner 36. With this configuration, DC power from the grid storage battery 12 is supplied to the second power conditioner 36 of the power demanding facility 30 via the bypass connection wiring 22. The second power conditioner 36 converts the DC power from the grid storage battery 12 into AC power and outputs it to the second wiring 38. As a result, power is supplied from the grid storage battery 12 to the power demanding facility 30 via the bypass connection wiring 22. In this way, the power from the system storage battery 12 may be transmitted as DC power as is (or after being transformed as necessary) through the bypass connection wiring 22. The power from the system storage battery 12 may be stored in the storage battery 42 of the power demanding facility 30.

[0036] (Modification) As shown in Fig. 6, the system 10 of the above-mentioned first embodiment may further include a solar panel 54. With such a configuration, the system 10 can supply not only the stored power of the grid storage battery 12 but also the generated power by the solar panel 54 to the power demanding facility 30. This can increase the utilization rate of renewable energy in the power demanding facility 30. Although not shown in the figure, a similar solar panel 54 can also be provided in the systems 110 and 210 of the second and third embodiments.

[0037] In addition to or instead of the above, as shown in FIG. 7, the power demanding facility 30 may further include an EV charger 58. The EV charger 58 is a DC charger that is connected to the DC wiring 38c in the power demanding facility 30 and can charge an electric vehicle (not shown) using power supplied from the grid storage battery 12. Note that, during normal operation, the EV charger 58 can also charge the electric vehicle using power supplied from the grid 2, power stored in the storage battery 42, or power generated by the solar panel 44. As with the EV charger 28 in the system 10, the power charged in the electric vehicle is not only consumed by the electric vehicle, but can also be used for power supply to the residence (V2H) by connecting the electric vehicle to the residence. Note that the EV charger 58 is not limited to the system 10 in the first embodiment, and can be similarly provided in the power demanding facility 30 in the systems 110 and 210 in the second and third embodiments.

[0038] Although the embodiments of the present technology have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or drawings achieves multiple objectives simultaneously, and achieving one of the objectives itself has technical utility. [Explanation of symbols]

[0039] 2: grid, 10, 110, 210: grid storage system (system), 12: grid storage battery, 14: transformer, 16: power conditioner, 18: first grid connection wiring, 20: first circuit breaker, 22: bypass connection wiring, 24: second circuit breaker, 26: control device, 28, 58: EV charger, 30: power demand facility, 34: transformer, 36: power conditioner, 38: second grid connection wiring, 40: third circuit breaker, 42: storage battery, 44, 54: solar panel

Claims

1. A power grid storage system, comprising: A system storage battery electrically connected to the system; a first circuit breaker that is provided on a first wiring that electrically connects between the grid and the grid storage battery and that connects and disconnects the first wiring; a bypass connection wiring branched from the first wiring and connected to a second wiring that electrically connects between an electric power demanding facility and the grid; a bypass circuit breaker provided on the bypass connection wiring and configured to connect and disconnect the bypass connection wiring; Equipped with a second circuit breaker that connects and disconnects the second wiring is provided on the second wiring, The bypass connection wiring is connected to the first wiring and the second wiring on the opposite side to the system from the first circuit breaker or the second circuit breaker, Grid storage system.

2. The first wiring is provided with a first transformer located in a section between the first circuit breaker and the grid storage battery, the second wiring is provided with a second transformer located in a section between the second circuit breaker and the grid storage battery, 2. The grid storage system according to claim 1, wherein the bypass connection wiring is connected to the first wiring and the second wiring on a side closer to the grid than the first transformer or the second transformer.

3. the first wiring is provided with a first transformer located in a section between the first circuit breaker and the grid storage battery, and a first power conditioner located in a section between the first transformer and the grid storage battery, the second wiring is provided with a second transformer located in a section between the second circuit breaker and the grid storage battery, 2. The grid storage system according to claim 1, wherein the bypass connection wiring branches off from a section in the first wiring between the first transformer and the first power conditioner, and is connected to a section in the second wiring between the second transformer and the power demand facility.

4. the first wiring is provided with a first transformer located in a section between the first circuit breaker and the grid storage battery, and a first power conditioner located in a section between the first transformer and the grid storage battery, the second wiring is provided with a second transformer located in a section between the second circuit breaker and the grid storage battery, and a DC power source is connected to a section between the second transformer and the power demand facility via a second power conditioner; 2. The utility storage system of claim 1, wherein the bypass connection wiring branches off from a section in the first wiring between the first power conditioner and the grid storage battery, and is connected to a section in the second wiring between the second transformer and the power demand facility via the second power conditioner.

5. 5. The grid storage system according to claim 1, further comprising a vehicle charging device connected to the grid storage battery and configured to charge an electric vehicle using power stored in the grid storage battery.

6. A control device for controlling an operation of the bypass circuit breaker is further provided.

5. The grid storage system according to claim 1, wherein the control device is configured to prohibit the bypass circuit breaker from being conductive when at least one of the first circuit breaker and the second circuit breaker is conductive.

7. 5. The system according to claim 2, wherein the first transformer is configured to operate using power stored in the system storage battery when the first circuit breaker interrupts the first wiring.

8. 5. The system storage system according to claim 3, wherein the first power conditioner is configured to operate using power stored in the system storage battery when the first circuit breaker interrupts the first wiring.

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