JP7186028B2 - Grid interconnection system, grid interconnection unit, grid interconnection method, and grid interconnection system installation method - Google Patents

Description

The present invention relates to a grid interconnection system, a grid interconnection unit, a grid interconnection method, and a grid interconnection system installation method.

The market is shifting from gasoline vehicles or hybrid vehicles to electric vehicles such as plug-in hybrid vehicles (PHEV) or electric vehicles (EV). Patent Literature 1 discloses a V2H (Vehicle to Home) device that connects such an electric vehicle to electrical equipment used in a home and supplies power to the electrical equipment in the home as an emergency power supply in the event of a disaster or the like. ing.

On the other hand, the power distribution service from automobiles to the power system is not limited to V2H, and is a general term for V2B (Vehicle to Building) or V2G (Vehicle to Grid), which is a service for general households and larger consumers and power grids. is expanding to V2X.

JP 2018-61432 A

A battery mounted on an electric vehicle has a large amount of electric power, and the average operating time of an electric vehicle per day is relatively short. For this reason, there are great expectations for supplying electric power from electric vehicles to loads such as electric power systems in the event of a disaster. However, when the electric vehicle is in operation at the time of a disaster, the power of the electric vehicle cannot be used and the required power cannot be supplied to the load.

The present invention has been made in view of such circumstances, and includes a grid interconnection system, a grid interconnection unit, a grid interconnection method, and a grid interconnection system installation method capable of supplying required power to a load. intended to provide

A grid interconnection system according to the present invention is a grid interconnection system with a power system having a commercial power supply, and includes a storage battery installed in a parking lot, an AC/DC power converter for the storage battery, and a charge/discharge stand for an electric vehicle. , an inverter device for a solar cell and an interconnection control device, wherein the interconnection control device is configured to switch from at least one of the charging/discharging stand, the inverter device, or the AC/DC power conversion device to a first Power the load.

A grid interconnection system according to the present invention includes a charging/discharging stand for an electric vehicle installed in a parking lot, a solar battery installed in the parking lot, and a direct current output by the solar battery installed in the parking lot. and a grid interconnection unit installed in the parking lot, wherein the grid interconnection unit accommodates a storage battery board that accommodates a storage battery and an AC/DC power conversion device for the storage battery A power conversion board and an interconnection board accommodating an interconnection control device for system interconnection between the electric power system and the charging/discharging stand or the inverter device are provided.

A system interconnection unit according to the present invention is a system interconnection unit with an electric power system, and includes a storage battery board installed in a parking lot and containing a storage battery, and an AC/DC power conversion unit installed in the parking lot for the storage battery. A power conversion board that accommodates the device, and an interconnection board that is installed in the parking lot and houses an interconnection control device that performs system interconnection between the power system and the charge/discharge stand or the inverter device.

A system interconnection method according to the present invention is a system interconnection method with an electric power system, and includes a storage battery installed in a parking lot, an AC/DC power converter for the storage battery, a charge/discharge stand for an electric vehicle, a solar battery, An inverter device for the solar cell and an interconnection control device are provided, and power is supplied to a predetermined load from at least one of the charging/discharging stand, the inverter device, and the AC/DC power conversion device in an emergency of the power system.

A method for installing a grid-connected system according to the present invention is a method for installing a grid-connected system with a power system. A power conversion board that accommodates an AC/DC power converter and an interconnection board that houses an interconnection control device that interconnects with the power system are installed side by side, and power is supplied from a commercial power supply through a high-voltage lead-in opening of the interconnection board. , connect a cable to a predetermined load through the high-voltage drawer opening of the interconnection board, and connect a charge-discharge stand for electric vehicles and an inverter device for solar cells through the low-voltage drawer opening of the interconnection board Connect the cable from

According to the present invention, required power can be supplied to the load.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of an external appearance structure of the grid connection system of this Embodiment. It is a top view which shows an example of installation of the grid connection system of this Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows an example of installation of the grid connection system of this Embodiment. FIG. 2 is a schematic diagram showing an example of an electrical conduit buried underground; FIG. 4 is a plan view showing an arrangement example of decorative walls installed around the grid connection unit; 1 is a schematic diagram showing an example of a circuit configuration of a grid interconnection system according to an embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a first example of grid interconnection when a power system is normal by the grid interconnection system of the present embodiment; FIG. 4 is a schematic diagram showing a second example of grid interconnection when the power grid is normal by the grid interconnection system of the present embodiment; FIG. 2 is a schematic diagram showing an example of self-sustained operation in an emergency of the power system by the interconnection system of the present embodiment; FIG. 4 is a schematic diagram showing an example of operation switching when the power system is restored from an emergency to a normal state by the grid interconnection system of the present embodiment; It is a schematic diagram which shows an example of the circuit configuration of a grid connection system in the case of adding an inverter apparatus and a solar cell to a high voltage side. FIG. 10 is a schematic diagram showing an example of self-sustained operation in an emergency when the grid-connected system in which an inverter device and a solar cell are added to the high-voltage side; It is a schematic diagram which shows an example of the circuit configuration of the grid connection system in the case of low-voltage interconnection.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on the drawings showing its embodiments. FIG. 1 is a schematic diagram showing an example of an external configuration of a grid interconnection system 100 according to this embodiment. In the example of FIG. 1, the parking lot has four parking spaces. A carport 500 is installed in the parking lot, and a solar cell (solar cell panel) 510 is attached to the upper surface of the carport. The grid interconnection system 100 includes charging/discharging stands 41, 42, 43, and 44 for the electric vehicles (51, 52, 53, and 54) installed in the parking lot, and a solar battery 510 installed in the parking lot, which will be described later. It includes an inverter device 520 and a system interconnection unit installed in a parking lot. The grid interconnection system 100 can be provided as equipment for business continuity planning (BCP). The system interconnection unit includes a storage battery board 10 that houses a storage battery (not shown), a power conversion board 20 that houses a storage battery PCS (Power Conditioning System) (not shown), and a system interconnection control device that connects the system to the power system. (not shown) is provided. Note that the number of charge/discharge stands is not limited to four. The interconnection control device can perform system interconnection between the power system and at least one of the storage battery PCS, the charging/discharging stand, and the inverter device.

Electric vehicles are plug-in hybrid vehicles (PHEV) or electric vehicles (EV), also referred to herein as PHEVs or EVs. The charge/discharge stands 41 to 44 can charge and discharge a battery (vehicle storage battery) mounted on an electric vehicle. The inverter device 520 can convert direct current to alternating current, and converts the direct current from the solar cell 510 to alternating current for output. That is, inverter device 520 can discharge the energy of solar cell 510 . The storage battery PCS (also referred to as an AC/DC power converter) housed in the power conversion board 20 can convert power in both directions, from alternating current to direct current and from direct current to alternating current. Also called a storage battery) can be charged and discharged. The interconnection control device housed in the interconnection board 30 performs system interconnection operation between the power system, the storage battery PCS, the charging/discharging stands 41 to 44, and the inverter device 520 when the power system is normal, and when the power system is abnormal. In the event of a disaster, the storage battery PCS, charging/discharging stands 41 to 44, and inverter device 520 can be operated independently.

By installing the charging/discharging stands 41 to 44, the inverter device, the storage battery board 10, the power conversion board 20, and the interconnection board 30 (system interconnection unit) in the parking lot, the electric vehicle can be operated in the event of a disaster. Therefore, when all or part of the electric vehicle is not parked in the parking lot and the required power cannot be supplied from the charging/discharging stands 41 to 44 to the predetermined load (also referred to as the important load or first load). Alternatively, when the power that can be supplied from the inverter device 520 is small, more specifically, even when the required power cannot be supplied to the important load from the charge/discharge stands 41 to 44 and the inverter device 520, the storage battery PCS can supply the storage battery. Since power can be supplied to the load, the required power can be supplied to the load as a whole.

FIG. 2 is a plan view showing an example of installation of the grid interconnection system 100 of this embodiment, and FIG. 3 is a front view showing an example of installation of the grid interconnection system 100 of this embodiment. In the illustrated example, it is assumed that, of the four parking spaces 501 to 504, the electric vehicle parked in the parking space 501 is not parked. Reference numeral 6 is a collision prevention pole, and reference numeral 7 is a wheel chock.

As shown in FIG. 2, the storage battery board 10, the power conversion board 20, and the interconnection board 30 are arranged side by side along the vehicle length direction of the parking space (the direction indicated by symbol L in the figure). That is, the storage battery board 10, the power conversion board 20, and the interconnection board 30 can be arranged side by side along the vehicle length direction of the parking space. By arranging the storage battery board 10, the power conversion board 20, and the interconnection board 30 side by side along the vehicle length direction of the parking space arranged for each electric vehicle in the parking lot, for example, a parking space for about one electric vehicle. The system interconnection unit (storage battery board 10, power conversion board 20 and interconnection board 30) can be arranged, and the site area required for the parking lot including the system interconnection unit can be made compact. In addition, since the distance between the grid connection unit and the charging/discharging stands 41 to 44 can be shortened, wiring work and burying work for power lines and communication/control lines, which will be described later, are facilitated, and the cost required for construction is reduced. can do.

The storage battery board 10 has opening/closing doors 121, 122, and 123 on the front surface on the parking space side. The power converter board 20 has an opening/closing door 211 on the front surface on the parking space side. The interconnection board 30 has open/close doors 311 and 312 on the front surface on the parking space side. That is, the storage battery board 10, the power conversion board 20, and the interconnection board 30 can be installed so that the opening/closing doors provided on each of the storage battery board 10, the power conversion board 20, and the interconnection board 30 face the parking space side. . Each opening/closing door can be opened by a worker for maintenance and inspection of the storage battery board 10, the power conversion board 20, and the interconnection board 30. FIG.

For example, as shown in FIG. 2, an electric vehicle parked in a parking space 501 adjacent to each opening/closing door of the storage battery board 10, the power conversion board 20, and the interconnection board 30 is moved from the parking space 501, and the parking space 501 is moved. By opening the parking space 501, it is possible to use the parking space 501 as a work space for maintenance and inspection of the grid-connected unit. As a result, it is not necessary to install the system interconnection unit in a state in which a work space for maintenance and inspection is secured in advance, and the occupied area including the work space can be reduced.

The storage battery board 10 has an intake/exhaust port 125 on the rear surface opposite to the parking space. The power conversion board 20 has an intake/exhaust port 215 on the rear surface opposite to the parking space. The storage battery board 10 accommodates a cooling device and a heater (not shown) for temperature control of the storage battery in addition to the storage battery. In addition to the storage battery PCS, the power conversion board 20 houses a cooling device (not shown) for heat dissipation of the storage battery PCS. By providing air intake/exhaust ports on the back side opposite to the parking space, it is possible to suppress hot air from hitting the users of the parking lot, thereby preventing the users from feeling uncomfortable. can.

The storage battery board 10, the power conversion board 20, and the interconnection board 30 can have a plate thickness of 2.3 mm or more. Usually, a cubicle-type high-voltage power receiving equipment (simply called a cubicle) uses a metal plate having a thickness of about 1.6 mm. In this case, according to the fire prevention ordinance, the cubicle must be installed at least 3m away from the building. By setting the board thickness to 2.3 mm or more, the restriction that the separation distance from the building is 3 m or more is eliminated. Therefore, even for parking lots adjacent to buildings, the layout of the grid-connected unit can be considered without considering the separation distance from the building, increasing the degree of freedom in installing the grid-connected unit. , resulting in easier installation.

As shown in FIG. 2, the bottom plate of the interconnection board 30 is formed with a high pressure lead-in port 301 and a high pressure lead-out port 302 on the rear side, and a low-pressure lead-out port 303 on the front side. The high-voltage lead-in 301 is wired through a wire tube (for example, a flexible hard polyethylene tube) buried in the ground, and is connected to a power line (high-voltage power line) from the commercial power supply side of the power system and communication/ The control line is pulled in to an appropriate length. A power line (high-voltage power line) from the load side and a communication/control line are drawn into the high-voltage outlet 302 through a conduit buried in the ground. The low-voltage outlet 303 includes a ground line wired through a conduit buried in the ground, a power line (low-voltage power line) and a communication/control line between the charging/discharging stands 41 to 44, and an inverter device 520. Power lines (low-voltage power lines) and communication/control lines between them are drawn in to an appropriate length.

FIG. 4 is a schematic diagram showing an example of a conduit buried underground. In FIG. 4, the diagram on the left shows an example of excavation on the low pressure side, and the diagram on the right shows an example of excavation on the high pressure side. On the low-voltage side, power lines (for example, CV cables: cross-linked polyethylene insulated vinyl sheath cables) are wired to each of the five conduits corresponding to the four charge/discharge stands 41 to 44 and one inverter device 520, and 4 Communication and control lines are wired to each of the five electrical conduits corresponding to the charging/discharging stands 41 to 44 and one inverter device 520, and each electrical conduit is inserted to a required depth (for example, 60 cm or more) underground. ). On the high voltage side, power lines (e.g., CV cables) are wired in conduits, communication and control lines are wired in separate conduits, and each conduit is installed at a required depth (e.g., 60 cm or more) underground. Buried.

The grid interconnection system 100 of this embodiment can be installed as follows. That is, a storage battery board 10, a power conversion board 20, and an interconnection board 30 are installed side by side on a foundation 1 provided on the ground of a parking lot. By inserting the foundation bolts fixed to the foundation 1 into the bolt holes formed in the bottom plates (not shown) of the storage battery board 10, the power conversion board 20, and the interconnection board 30 and tightening the nuts, the storage battery board 10, the power conversion board 20 and the interconnection board 30 can be fixed to the foundation 1;

By separating the system interconnection unit into three equipment panels of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30, when the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are brought into the installation site This eliminates the need for large transport vehicles. Moreover, when lifting the storage battery board 10, the power conversion board 20, and the interconnection board 30 at the installation site and moving them to the installation position, a large heavy machine becomes unnecessary. In particular, in installation in a parking lot such as a shopping mall where an unspecified number of users come and go, it is possible to prevent users from being inconvenienced or having a bad impression. In addition, it is possible to realize a compact equipment installation that makes effective use of the limited space in the parking lot.

Also, a cable from a commercial power supply is connected through the high voltage lead-in port 301 of the interconnection board 30, a cable to a predetermined load is connected through the high voltage outlet 302 of the interconnection board 30, and a low voltage outlet 303 of the interconnection board 30 is connected. Cables from the charging/discharging stands 41 to 44 and the inverter device 520 are connected through. Cables include power lines and communication and control lines. Since the wire lengths of the low-voltage side wiring and the communication/control line can be assumed by the package design of the system interconnection unit, it is possible to prepare wire-processed ones in advance.

With the above configuration, installation work of the grid-connected unit can be performed in a relatively short period of time, and construction costs can be reduced.

Also, a plurality of charging/discharging stands 41 to 44 can be arranged side by side on the foundation 1 provided on the ground of the parking lot. Since the grid-connected unit is installed adjacent to the parking space, the distance between the grid-connected unit and the charging/discharging stands 41 to 44 can be shortened. Construction work becomes easier and the cost required for construction work can be reduced.

FIG. 5 is a plan view showing an arrangement example of decorative walls 90 installed around the grid connection unit. As shown in FIG. 5, a decorative wall 90 is placed on the foundation 1 on which the storage battery board 10, the power conversion board 20 and the interconnection board 30 are installed so as to cover the periphery of the storage battery board 10, the power conversion board 20 and the interconnection board 30. can be installed in The decorative wall 90 can be a display board on which advertisements, art, etc. are displayed. The decorative wall 90 can have a height such that the storage battery board 10, the power conversion board 20, and the interconnection board 30 cannot be seen. In shopping malls and public places, the external appearance of the storage battery board 10, the power conversion board 20, and the interconnection board 30 is highly likely to give the user a slight sense of discomfort. Therefore, by covering the storage battery board 10, the power conversion board 20 and the interconnection board 30 with the decorative wall 90, it is possible to display information that arouses the interest of the user without making the user feel uncomfortable. .

Doorways 93 are provided on the front surface of the decorative wall 90 on the parking space side so as to correspond to the positions of the opening/closing doors 121 , 122 , and 123 of the storage battery board 10 . A doorway 92 is provided on the front face of the decorative wall 90 on the parking space side so as to correspond to the position of the opening/closing door 211 of the power conversion board 20 . In addition, an entrance 91 is provided on the front surface of the decorative wall 90 on the parking space side so as to correspond to the positions of the opening/closing doors 311 and 312 of the interconnection board 30 . The doorways 91 to 93 may be doors that can be opened and closed, or detachable wall plates. Thereby, even if the storage battery board 10, the power conversion board 20 and the interconnection board 30 are covered with the decorative wall 90, maintenance and inspection of the storage battery board 10, the power conversion board 20 and the interconnection board 30 can be performed.

The rear surface of the decorative wall 90 on the opposite side of the parking space is provided with an opening 95 corresponding to the position of the intake/exhaust port 125 of the storage battery board 10 . Further, an opening 94 is provided on the rear surface of the decorative wall 90 on the opposite side of the parking space so as to correspond to the position of the intake/exhaust port 215 of the power conversion board 20 . The openings 94, 95 may be punched or slit or the like. By providing the openings 94 and 95, the storage battery board 10, the power conversion board 20 and the interconnection board 30 are cooled even when the decoration wall 90 covers the periphery of the storage battery board 10, the power conversion board 20 and the interconnection board 30. be able to.

In the example of FIG. 5 , the decorative wall 90 is configured to cover all four surfaces around the storage battery board 10 , the power conversion board 20 and the interconnection board 30 , but the present invention is not limited to this. For example, only two of the four surfaces may be covered. For example, when covering only two surfaces, it is possible to cover two surfaces, the storage battery board 10 side and the back side. The side of the storage battery board 10 is the most visible to the user, and the rear side can hide discrepancies in the sizes of the boards. Also, by using two surfaces, the cost can be reduced more than the case of four surfaces.

In the example of FIG. 2, the storage battery board 10, the power conversion board 20, and the interconnection board 30 are installed side by side at a position adjacent to the endmost parking space 501 among the four parking spaces 501 to 504. However, the installation method is not limited to the example of FIG. For example, a section corresponding to approximately one parking space may be provided between the parking space 502 and the parking space 503, and the storage battery board 10, the power conversion board 20, and the interconnection board 30 may be arranged side by side in the section. .

FIG. 6 is a schematic diagram showing an example of the circuit configuration of the interconnection system 100 of this embodiment. The storage battery board 10 accommodates a storage battery (stationary storage battery) 11, a control device (not shown), a cooling device, a heater, and the like. The power conversion board 20 accommodates a storage battery PCS21, a control device and a cooling device (not shown), and the like. The interconnection board 30 includes a remote IO 31, a VCB 32 as a switching unit, a transformer 33, a UVR 34, a voltage transformer 35, and the like, in addition to the interconnection control device 36. FIG.

The interconnection board 30 includes terminal blocks 101, 102 and breakers 103, 104, 111-115. The terminal block 101 is provided on the electric line (high voltage power line) on the high voltage lead-in side. That is, the terminal block 101 is connected to a power line from the secondary side of the step-down transformer 85 of the power system and a power line from the primary side of the step-down transformer 86 connected to a general load (second load). Here, the general load includes, for example, electrical equipment that is relatively unaffected even if power is interrupted in the event of a disaster.

The terminal block 102 is provided on the electric line (high-voltage power line) on the high-voltage lead side. That is, the terminal block 102 is connected to the power line from the primary side of the step-down transformer 87 connected to the important load (first load). Here, the important load is an important load (important load) that needs to be continuously supplied with power even in the event of a disaster. Air conditioners, etc. are included.

One electrode of the VCB 32 , the UVR 34 and the potential transformer 35 are connected to the terminal block 101 via the disconnector 37 . The voltage transformer 35 will be described later. The VCB 32 is a vacuum circuit breaker in which electrodes are housed in a high-vacuum container, and the material that forms the arc discharge that occurs between the electrodes when the current is interrupted is diffused in the high-vacuum to extinguish the arc. It is a vessel.

The UVR 34 is an undervoltage relay and can detect abnormalities such as short circuits and power outages on the power system side. When the UVR 34 detects an abnormality, it outputs a control signal to the VCB 32 to cut off the electric circuit of the VCB 32 .

A power monitoring unit 80 that monitors power on the primary side of the step-down transformer 85 is provided in a building that uses a grid interconnection system to manage power demand. Note that the power monitoring unit 80 is not necessarily essential. Further, when the step-down transformer 85 is not installed, the locations monitored by the power monitoring unit 80 are appropriately set. Power monitoring unit 80 includes OVGR 81 , RPR/UPR 82 and power sensor 83 . The OVGR 81 is a ground fault overvoltage relay that continuously detects ground faults in the power system. The RPR/UPR 82 is a reverse power relay and underpower relay, and can detect abnormalities such as reverse power flow to the power system side and short-circuit accidents. Also when an abnormality is detected in the OVGR 81 and the RPR/UPR 82, the electrical circuit of the VCB 32 is cut off.

The remote IO 31 is an AD converter that converts the power (analog value) detected by the power sensor 83 into a digital value, and outputs the converted power (digital value) to the interconnection control device 36 .

A transformer 33 (more specifically, a first winding 331) is connected to the other electrode of the VCB 32 via an electric circuit. Transformer 33 has a first winding 331, a second winding 332 connected to breaker 103 via an electric circuit, and a third winding 333 connected to breakers 111-115 via an electric circuit.

That is, the transformer 33 can be a three-phase, three-winding transformer. The voltage and power (apparent power) on the first winding 331 side can be, for example, 6600 V and 50 kVA, and the voltage and power on the second winding 332 side can be, for example, 300 V and 50 kVA, The voltage and power on the side of the third winding 333 can be, for example, 210 V and 50 kVA, but the voltage and power are not limited to these values. By using a three-winding transformer as the transformer 33, space saving and weight reduction can be achieved as compared with the case where two transformers are provided.

A storage battery PCS21 is connected to the breaker 103 . The storage battery PCS21 is capable of bi-directionally converting power from alternating current to direct current and from direct current to alternating current, and is capable of charging and discharging the storage battery 11 .

A circuit of one of the three phases of the third winding 333 is connected to the breaker 104. For example, a voltage of 105 V to 210 V is supplied as a power source for the control device and the cooling device in the power conversion board 20. It is supplied as a power source for the controller, cooling device and heater in the storage battery board 10 .

Power lines from charging/discharging stands 41-44 are connected to the breakers 111-114, respectively. The charging/discharging stands 41-44 are equipped with conversion circuits capable of bi-directionally converting power from alternating current to direct current and from direct current to alternating current, and can charge and discharge the batteries mounted on the electric vehicles 51 to 54. . A power line from the inverter device 520 is connected to the breaker 115 . The inverter device 520 includes a conversion circuit capable of converting power from direct current to alternating current, and can convert the energy of the solar cell 510 into alternating current (discharge the solar cell 510).

The charging/discharging stands 41-44 include notification units (not shown) for notifying information regarding charging/discharging of the batteries of the electric vehicles 51-54. The notification unit may be, for example, a display panel or an indicator lamp, or may notify a terminal device used by a user or an administrator via wireless communication. Information related to charging and discharging includes, for example, operating states such as preparing for charging and discharging, preparation completed, charging and discharging, and charging and discharging completed, battery state of charge (SOC), time required for full charge, and full charge. It can include information such as remaining time until discharge, dischargeable amount, charge for charge/discharge, and the like. Inverter device 520 also includes a notification unit (not shown) that notifies information about the discharge of solar cell 510 . The notification unit may be, for example, a display panel or an indicator lamp, or may notify a terminal device used by an administrator or the like via wireless communication. The information on the discharge of the solar cell, for example, the information on the discharge of the solar cell 510, includes information such as operating states such as standby stop, discharging, output curtailed operation, operating voltage of the solar cell, and output power. can be done. As a result, it is possible to timely grasp information on charging and discharging of the electric vehicle and information on discharging of the solar battery.

Next, a grid interconnection method by the grid interconnection system 100 of the present embodiment will be described.

FIG. 7 is a schematic diagram showing a first example of grid interconnection by the grid interconnection system 100 of the present embodiment when the power system is normal. The interconnection control device 36 can charge the electric vehicles 51 to 54 using the charging/discharging stands 41 to 44 when the power system is normal and the charging mode is set. As a result, the grid interconnection system 100 can be used as a rapid charging/discharging stand for an electric vehicle. Note that the inverter device 520 can output power corresponding to the amount of solar radiation at that time within a range in which reverse power flow to the power system does not occur, and can supply, for example, part of charging power to an electric vehicle. .

Also, although not shown, when the power system is normal, power is supplied from the commercial power source to the important loads. Also, when the power system is normal, power is supplied from the commercial power source to the general load.

By dividing the load into two systems, a general load and a critical load, the power to be supplied in the event of a disaster, which will be described later, is minimized, and power is continuously supplied to the critical load, and the time during which power can be supplied to the critical load. can be lengthened.

FIG. 8 is a schematic diagram showing a second example of grid interconnection by the grid interconnection system 100 of the present embodiment when the power system is normal. When the power system is normal and the energy management mode (energy management mode) is set, the interconnection control device 36 detects, for example, the power sensor 83 when the power of the power receiving point at a predetermined location is equal to or higher than the threshold. When the electric power is equal to or higher than the threshold, electric power is supplied from the charging/discharging stands 41 to 44 and the inverter device 520 to the important loads and general loads, or electric power is supplied from the storage battery PCS21 to the important loads and general loads so that the electric power is equal to or lower than the threshold. supply. This enables power peak cut operation. Note that when the power at the receiving point at a predetermined location is equal to or less than the threshold, power can be supplied from the power system to the charging/discharging stations 41 to 44 or the storage battery PCS21 within a range not exceeding the threshold.

FIG. 9 is a schematic diagram showing an example of self-sustained operation in an emergency of the power system by the grid interconnection system 100 of the present embodiment. The interconnection control device 36 opens the electrodes of the VCB 32 to disconnect the commercial power supply from the important load when the power system is in an emergency. In this state, by supplying electric power from the charging/discharging stands 41 to 44 and the inverter device 520, or the storage battery PCS21, the grid connection control device 36 can enable self-sustained operation.

The interconnection control device 36 can supply power from at least one of the charging/discharging stations 41 to 44, the inverter device 520, or the storage battery PCS21 to the important load in the event of an emergency in the power system.

When the interconnection control device 36 performs self-sustained operation, the storage battery PCS21 performs voltage control and operates as a voltage source. The current required to obtain the required power is realized by connecting the charging/discharging stands 41 to 44 and the inverter device 520 to the storage battery PCS21 operating as a voltage source and operating as a current source.

With the above configuration, even if the required power cannot be supplied from the charge/discharge stands 41 to 44 and the inverter device 520 to the important loads in the event of a disaster because the electric vehicle is in operation, the storage battery PCS 21 supplies power to the important loads. can be supplied, so that the required power can be supplied to the important loads of the power system as a whole.

More specifically, when the power system is in an emergency and the power that can be supplied from the charging/discharging stands 41 to 44 and the inverter device 520 exceeds the capacity of the important load, the interconnection control device 36 controls the charging/discharging stands 41 to 44 and the inverter device 520 supplies surplus power to the storage battery PCS21. As a result, when the electric vehicle is parked in the parking space and is not in operation, the electric power of the electric vehicle can be effectively used.

In addition, when the power system is in an emergency and the power that can be supplied from the charge/discharge stands 41 to 44 and the inverter device 520 is less than the capacity of the important load, the grid connection control device 36 controls the charge/discharge stands 41 to 44 and the inverter device. 520 and the battery PCS21 to supply power to the critical loads. For example, if the capacity of the important load is 50 kVA, and 30 kVA of power can be supplied from the charging/discharging stands 41 to 44 and the inverter device 52, 20 kVA of power is supplied from the storage battery PCS21, and the transformer 33 50 kVA of power can be supplied to critical loads from the high voltage side of the . If the capacity of the critical load changes, only power suitable for the capacity of the critical load can be supplied. As a result, when all or part of the required number of electric vehicles are not parked in the parking space and are in operation, the shortage of power can be supplied from the storage battery PCS21, and the important load of the power system can be supplied. It can supply the required power.

FIG. 10 is a schematic diagram showing an example of operation switching when the power system is restored from an emergency to a normal state by the grid interconnection system 100 of the present embodiment. When the power system recovers, the interconnection control device 36 supplies power to the important load from at least one of the charging/discharging stands 41 to 44, the inverter device 520, or the storage battery PCS21 without interruption from the commercial power source. switch to The uninterrupted switching, for example, detects the phase of the commercial power supply by the voltage transformer 35, and closes the electrodes of the VCB 32 at the timing when the phase of the storage battery PCS21 is synchronized with the phase of the commercial power supply, thereby switching the power from the commercial power supply. Supply critical loads.

After the commercial power supply is reconnected to the important load without interruption, the interconnection control device 36 stops the operation of the charging/discharging stands 41 to 44, the inverter device 520 and the storage battery PCS21, and terminates the self-sustained operation. Since the storage battery PCS21 performs voltage control, uninterrupted switching is possible. After that, the interconnection control device 36 can restart the charging/discharging stands 41 to 44, the inverter device 520, and the storage battery PCS21 for system interconnection. As a result, by synchronizing the phases and switching without interruption, stable power can be supplied to the important load.

In the above-described embodiment, the inverter device 520 and the solar cell 510 are added to the low voltage side (for example, 210 V), but the present invention is not limited to this. For example, inverter devices and solar cells can be added on the high voltage side. A configuration in which an inverter device and a solar cell are added to the high voltage side will be described below.

FIG. 11 is a schematic diagram showing an example of a circuit configuration of a grid interconnection system 100 when an inverter device and a solar cell are added to the high voltage side. The difference from the configuration in which the inverter device 520 and the solar cell 510 are added to the low voltage side illustrated in FIG. there is An electric circuit between the VCB 32 and the transformer 33 is connected to the terminal block 106, to which the transformer 88, the inverter device 540 and the solar cell 530 are connected in this order. Terminal block 106 is similar to terminal block 102 . The inverter device 540 can output, for example, 50 kVA power and 210 V AC to the transformer 88 . The transformer 88 can boost the voltage output by the inverter device 540 to 6600V, for example. Note that the voltage output by inverter device 540 is not limited to 210V.

FIG. 12 is a schematic diagram showing an example of self-sustained operation in an emergency of the power system by the system interconnection system 100 when an inverter device and a solar cell are added to the high voltage side. The interconnection control device 36 opens the electrodes of the VCB 32 to disconnect the commercial power supply from the important load when the power system is in an emergency. By supplying power from the inverter device 540, the charging/discharging stands 41 to 45, or the storage battery PCS21 in this state, the grid connection control device 36 can enable self-sustained operation.

The interconnection control device 36 can supply power from at least one of the inverter device 540, the charging/discharging stations 41 to 45, or the storage battery PCS21 to the important load when the power system is in an emergency.

When the interconnection control device 36 performs self-sustained operation, the storage battery PCS21 performs voltage control and operates as a voltage source. For important loads, the power supplied from the inverter device 540 is given the highest priority, and the inverter device 540 is operated with the highest priority. If the power required by the important load cannot be supplied from the inverter device 540, the power is supplied from the charging/discharging stands 41-45. If the power required by the important load cannot be supplied from the inverter device 540 and the charging/discharging stands 41 to 45, the power is supplied from the storage battery PCS21. As a result, even if the power supply from the solar cell 530 is insufficient, the shortage can be supplied from the charging/discharging stands 41 to 45 or the storage battery PCS21, and the required power can be supplied to the load.

When the power output from the inverter device 540 is excessive, that is, when the inverter device 540 can supply more power than the power required by the important load, the charge/discharge stands 41 to 45 are turned off from the inverter device 540. PHEV/EV 51-55 can be charged via the storage battery PCS21, or the storage battery 11 can be charged via the storage battery PCS21. Thereby, the power generated by the solar cell 530 can be effectively used. Further, even if the PHEV/EV 51 to 55 and the storage battery 11 are charged, if the output of the inverter device 540 is excessive, the inverter device 540 can be operated in a restrained manner.

In the above-described embodiment, the power system is interconnected at a high voltage of 6600 V, but the configuration is not limited to this, and the system may be interconnected at a low voltage. A case of system interconnection at low voltage will be described below.

FIG. 13 is a schematic diagram showing an example of the circuit configuration of the grid interconnection system 100 in the case of low voltage interconnection. A step-down transformer 185 is provided on the commercial power supply side, and the step-down transformer 185 steps down 6600V to 210V, for example. A general load is connected to the secondary side of the step-down transformer 185 . A power line from a general load is connected to one end of the breaker 116 of the interconnection board 30 . The input side of the ELCB 39 is connected to the other end of the breaker 116 .

The ELCB 39 is an Earth Leakage Circuit Breaker, and can automatically break the circuit by detecting a leakage current caused by an earth leakage. The ELCB 39 has a function as an opening/closing part, and in an emergency such as an electric leakage, it can open the electric circuit and disconnect the commercial power supply from the important load.

A power line from the important load is connected to one end of the breaker 117 of the interconnection board 30 . The output side of the ELCB 39 is connected to the other end of the breaker 117 . A transformer 133 is connected to the output side of the ELCB 39 . If the input voltage of the general load and important load is lower than 210V, a step-down transformer may be provided on the input side of the general load and important load.

Transformer 133 may be a three-phase, three-winding transformer. If the voltage is low, it must be less than 50 kVA, so the voltage and power (apparent power) on the side of the first winding 334 can be, for example, 210 V and 49 kVA, and the voltage on the side of the second winding 335 and power can be, for example, 300V, 49kVA, and the voltage and power on the side of the third winding 336 can be, for example, 210V, 49kVA, but the voltage and power are not limited to these values. . Also, the transformer is not limited to a three-winding transformer, and may be configured to include two two-winding transformers. However, by using a three-winding transformer as the transformer 133, space saving and weight reduction can be achieved as compared with the case where two transformers are provided.

Also, the power of the charging/discharging stands 41 to 44 and the inverter device 521 as a whole must be less than 50 kVA. In the example of FIG. 13, the output power of the charging/discharging stations 41 to 44 is 10 kVA, and the output power of the inverter device 521 is 9 kVA.

In FIG. 13, the same components as those shown in FIG. 6 are denoted by the same reference numerals, and descriptions thereof are omitted. Also, the self-sustained operation when the power system is in an emergency is the same as the example of FIG.

In the above-described embodiment, the configuration includes four charging/discharging stands and one inverter device, but the combination of the number of charging/discharging stands and inverter devices is not limited to these. For example, the configuration may include a plurality of inverter devices. Moreover, in the above-described embodiment, the solar cell is installed on the upper surface of the carport, but the solar cell may be installed at a location other than the carport. The solar cells installed in the parking lot need only be installed near the parking lot to the extent that the wiring work between the grid connection unit and the grid connection unit is not long. , installation on facilities near parking lots or on sites near parking lots.

The grid interconnection system of the present embodiment is a grid interconnection system with a power system having a commercial power supply, and includes a storage battery installed in a parking lot, an AC/DC power converter for the storage battery, and a charge/discharge for an electric vehicle. A stand, an inverter device for solar cells, and an interconnection control device are provided, and in an emergency in the power system, the interconnection control device switches from at least one of the charging/discharging stand, the inverter device, or the AC/DC power conversion device to the Power one load.

The system interconnection method of the present embodiment is a system interconnection method with an electric power system, and includes a storage battery installed in a parking lot, an AC/DC power converter for the storage battery, a charging/discharging stand for an electric vehicle, a solar battery, , an inverter device for the solar cell and an interconnection control device, and in the event of an emergency in the power system, power is supplied to a predetermined load from at least one of the charge/discharge stand, the inverter device, or the AC/DC power conversion device. .

The grid connection system includes a storage battery installed in a parking lot, an AC/DC power conversion device for the storage battery, a charge/discharge stand for electric vehicles, an inverter device for solar cells, and a grid connection control device. An AC/DC power converter can convert power in both directions, from AC to DC and from DC to AC, and can charge and discharge a storage battery (also referred to as a stationary storage battery). The charge/discharge stand can charge and discharge a battery (vehicle storage battery) mounted on an electric vehicle (PHEV or EV). The inverter device can convert power from direct current to alternating current, and can discharge the solar cell. When the power system is normal, the interconnection control device performs system interconnection operation between the power system and the AC/DC power converter, charging/discharging stand, and inverter device. Self-sustaining operation by equipment, charging/discharging stand, and inverter equipment.

That is, the grid interconnection system supplies power from the commercial power supply to the first load (predetermined load) when the power system is normal. Also, power can be supplied to the first load from a charging/discharging stand, an inverter device, or an AC/DC power converter. The interconnection control device supplies electric power to the first load from at least one of the charging/discharging station, the inverter device, and the AC/DC power conversion device when the power system is in an emergency. The first load is an important load (important load) that needs to be continuously supplied with power even in the event of a disaster. and so on.

With the above configuration, even if the required power cannot be supplied to the first load from the charging/discharging stand and the inverter device in the event of a disaster because the electric vehicle is in operation, the AC/DC power converter can supply power to the first load. can be supplied, the required power can be supplied to the load as a whole.

The grid interconnection system of the present embodiment includes an opening/closing unit for opening and closing an electric circuit between the commercial power supply and the first load, and when the power system is in an emergency, the opening/closing unit is opened to switch the commercial power supply and the first load. disconnect from the first load;

The grid interconnection system includes an opening/closing unit that opens/closes an electric circuit between the commercial power supply and the first load. The switching part can be, for example, a vacuum circuit breaker (VCB), the electrodes of the switching part are housed in a high-vacuum container, and the material that constitutes the arc discharge that occurs between the electrodes when the current is interrupted. A circuit breaker that extinguishes an arc by diffusing it in a high vacuum.

The grid interconnection system opens the electrode of the switching unit to disconnect the commercial power supply and the first load in the event of an emergency in the power system. Thereby, it is possible to enable self-sustained operation by the interconnection control device.

The grid interconnection system of the present embodiment supplies power from the commercial power supply to the first load and a second load different from the first load when the power system is normal.

The grid interconnection system supplies power from a commercial power supply to a first load and a second load different from the first load when the power system is normal. While the first load is a critical load, the second load is a general load and includes electrical equipment that is relatively unaffected even if power is interrupted in the event of a disaster. By dividing the load into two systems, the first load and the second load, the power to be supplied in the event of a disaster is minimized, the power is continuously supplied to the important loads, and the time during which the power can be supplied is extended. can be done.

In the grid interconnection system of the present embodiment, the first winding connected to the commercial power supply side, the second winding connected to the AC/DC power converter side, the charging/discharging stand side, and the inverter device an interconnection board having a three-winding transformer with a third winding connected to the side;

The interconnection board includes a first winding connected to the commercial power supply side, a second winding connected to the AC/DC power converter side, and a third winding connected to the charging/discharging stand side and the inverter device side. a three-winding transformer having The first winding is a high-voltage side winding, and for example, a voltage of 6600V is applied or output, but the voltage is not limited to 6600V. The second winding is a winding on the low voltage side, and for example, a voltage of 300V is applied or output, but the voltage is not limited to 300V. The third winding is a winding on the low voltage side, and for example, a voltage of 210V is applied or output, but the voltage is not limited to 210V. By providing the 3-winding transformer, it is possible to save space and reduce the weight as compared with the case where two transformers are provided.

In the grid interconnection system of the present embodiment, when the power system is in an emergency and the power that can be supplied from the charge/discharge stand and the inverter device exceeds the capacity of the first load, Surplus power is supplied from the charging/discharging stand and the inverter device to the AC/DC power converter.

If the power that can be supplied from the charging/discharging stand and the inverter device exceeds the capacity of the first load in the event of an emergency in the power system, the grid connection control device transfers surplus power from the charging/discharging stand and the inverter device to the AC/DC power conversion device. supply. As a result, when the electric vehicle is parked in the parking space and is not in operation, the electric power of the electric vehicle can be effectively used.

In the grid interconnection system of the present embodiment, when the power system is in an emergency and the power that can be supplied from the charge/discharge stand and the inverter device is less than the capacity of the first load, the interconnection control device Power is supplied to the first load from both the charging/discharging stand, the inverter device, and the AC/DC power converter.

When the power system is in an emergency and the power that can be supplied from the charging/discharging stand and the inverter device is less than the capacity of the first load, the grid connection control device Power the first load. As a result, when all or part of the required number of electric vehicles are not parked in the parking space and are in operation, the power required for the shortage can be supplied from the AC/DC power converter, and the required power is supplied to the load. Power can be supplied.

In the grid interconnection system of the present embodiment, a first winding connected to the commercial power supply side and the inverter device side, a second winding connected to the AC/DC power converter side, and the charge/discharge stand an interconnection board having a three-winding transformer with a third winding connected to the side;

The interconnection board includes a first winding connected to the commercial power supply side and the inverter device side, a second winding connected to the AC/DC power converter side, and a third winding connected to the charging/discharging stand side. a three-winding transformer having The first winding is a high-voltage side winding, and for example, a voltage of 6600V is applied or output, but the voltage is not limited to 6600V. The second winding is a winding on the low voltage side, and for example, a voltage of 300V is applied or output, but the voltage is not limited to 300V. The third winding is a winding on the low voltage side, and for example, a voltage of 210V is applied or output, but the voltage is not limited to 210V. By providing the 3-winding transformer, it is possible to save space and reduce the weight as compared with the case where two transformers are provided.

In the grid interconnection system of the present embodiment, when the power system is in an emergency and the power that can be supplied from the inverter device exceeds the capacity of the first load, the grid interconnection control device Surplus power is supplied to the charging/discharging stand or the AC/DC power converter.

The interconnection control device supplies surplus power from the inverter device to the charging/discharging stand or the AC/DC power conversion device when the power that can be supplied from the inverter device exceeds the capacity of the first load in the event of an emergency in the power system. Thereby, the electric power generated by the solar cell can be effectively used.

In the grid interconnection system of the present embodiment, the interconnection control device controls the inverter device and the Power is supplied from the charging/discharging stand to the first load, or power is supplied from the inverter device, the charging/discharging stand, and the AC/DC power converter to the first load.

When the power system is in an emergency and the power that can be supplied from the inverter device is less than the capacity of the first load, the interconnection control device supplies power from the inverter device and the charging/discharging stand to the first load, or Power is supplied to the first load from the device, the charging/discharging station and the AC/DC power converter. As a result, even if the power supply from the solar cell is insufficient, the shortage can be supplied from the charging/discharging stand or the AC/DC power converter, and the required power can be supplied to the load.

The grid interconnection system of the present embodiment includes a notification unit that notifies information regarding charging and discharging of the battery of the electric vehicle by the charging/discharging station and discharging of the solar battery by the inverter device.

The notification unit notifies information about charging/discharging of the battery of the electric vehicle by the charging/discharging station and information about discharging of the solar battery by the inverter device. The notification unit may be provided in, for example, a charging/discharging stand, may be a display panel or indicator lamp, or may notify a terminal device used by a user or an administrator via wireless communication. Accordingly, it is possible to timely grasp the information on the charge/discharge of the electric vehicle and the information on the discharge of the solar battery.

In the grid interconnection system of the present embodiment, the grid interconnection control device charges the electric vehicle from the charging/discharging stand when the power grid is normal and the charging mode is set.

The interconnection control device charges the electric vehicle with the charging/discharging station when the power system is normal and the charging mode is set. As a result, it can be used as a rapid charging/discharging stand for an electric vehicle.

In the grid interconnection system of the present embodiment, when the power system is normal and the energy management mode is set, the power receiving point power at a predetermined location is equal to or higher than the threshold, the Power is supplied from the charging/discharging station and the inverter device to the first load and the second load, or power is supplied from the AC/DC power converter to the first load and the second load.

When the power grid is normal and the energy management mode is set, and the power at the power receiving point at a predetermined location is equal to or higher than the threshold, the interconnection control device outputs the first load and the second load from the charging/discharging station and the inverter device. or power is supplied from the AC/DC power converter to the first load and the second load. This enables power peak cut operation.

In the grid interconnection system of the present embodiment, when the power system is restored, the grid interconnection control device causes at least one of the charging/discharging stand, the inverter device, or the AC/DC power conversion device to switch from the first load to the first load. The power supplied to is switched to the power from the commercial power source without interruption.

When the power system recovers, the interconnection control device switches the power supplied to the first load from at least one of the charging/discharging stand, the inverter device, or the AC/DC power converter to the power from the commercial power source without interruption. . For example, when the phase of the AC output by the AC/DC power converter is synchronized with the phase of the commercial power supply, turning on the commercial power supply allows the first load to recover from the disaster. stable power supply.

The grid interconnection system of the present embodiment includes a charging/discharging stand for an electric vehicle installed in a parking lot, a solar battery installed in the parking lot, and a solar battery installed in the parking lot that outputs An inverter device that converts direct current to alternating current, and a grid interconnection unit installed in the parking lot, wherein the grid interconnection unit accommodates a storage battery panel that accommodates a storage battery and an AC/DC power converter for the storage battery. and an interconnection board accommodating an interconnection control device for system interconnection between the electric power system and the charging/discharging stand or the inverter device.

The grid interconnection system of this embodiment is used for business continuity planning.

This makes it possible to provide the grid interconnection system as equipment for business continuity planning (BCP).

The system interconnection unit of the present embodiment is a system interconnection unit with an electric power system, and includes a storage battery board installed in a parking lot and containing a storage battery, and an AC/DC power supply unit installed in the parking lot for the storage battery. A power conversion board that accommodates a conversion device, and an interconnection board that is installed in the parking lot and houses an interconnection control device that performs system interconnection between the power system and the charging/discharging stand or the inverter device.

The grid connection system consists of a charging/discharging stand for electric vehicles installed in the parking lot, a solar battery installed in the parking lot, and an inverter installed in the parking lot that converts the direct current output by the solar battery into alternating current. and a grid interconnection unit installed in the parking lot. The grid interconnection unit includes a storage battery panel that accommodates a storage battery, a power conversion panel that accommodates an AC/DC power converter for the storage battery, and an interconnection panel that accommodates an interconnection control device that performs system interconnection with the power system. Prepare. The charge/discharge stand can charge and discharge a battery (vehicle storage battery) mounted on an electric vehicle (PHEV or EV). The inverter device can convert the power of the solar cell into alternating current and discharge the energy of the solar cell. An AC/DC power converter can convert power in both directions, from AC to DC and from DC to AC, and can charge and discharge a storage battery (also referred to as a stationary storage battery). When the power system is normal, the interconnection control device performs grid-interconnected operation between the power system, the AC/DC power converter, and the charging/discharging station. Self-sustained operation by discharge stand.

By installing a charging/discharging stand, an inverter device, and a grid-connected unit in the parking lot, it is possible in the event of a disaster that all or part of the electric vehicle is not parked in the parking lot and charging is possible because the electric vehicle is in operation. Even if the required power cannot be supplied to the load from the discharge station, or if the solar cell cannot supply sufficient power, the power from the storage battery can be supplied to the load by the AC/DC power converter. Overall, the required power can be supplied to the load.

The method for installing a grid-connected system according to the present embodiment is a method for installing a grid-connected system with an electric power system. A power conversion board housing the AC/DC power converter and an interconnection board housing an interconnection control device for system interconnection with the power system are installed side by side, and the commercial power supply is passed through the high voltage lead-in opening of the interconnection board connect a cable from the grid, connect a cable to a predetermined load through the high voltage drawer opening of the interconnection board, and connect a charging/discharging stand for an electric vehicle and an inverter for a solar battery through the low voltage drawer opening of the interconnection board Connect the cables from the equipment.

The installation method of the grid connection system is to install a storage battery board that houses the storage battery, a power conversion board that houses the AC/DC power converter for the storage battery, and a grid interconnection with the power system on the foundation provided on the ground of the parking lot. Install the interconnection boards that accommodate the interconnection control devices to be installed side by side. By separating the grid connection unit into three equipment panels, a storage battery panel, a power conversion panel, and an interconnection panel, it is possible to transport the storage battery panel, power conversion panel, and interconnection panel to the installation site without using a large transport vehicle. becomes unnecessary. In addition, when the storage battery board, the power conversion board, and the interconnection board are lifted and moved to the installation position at the installation site, a large heavy machine is not required. In particular, in installation in a parking lot such as a shopping mall where an unspecified number of users come and go, it is possible to prevent users from being inconvenienced or having a bad impression.

The grid interconnection system is installed by connecting the cable from the commercial power source through the high voltage lead-in opening of the interconnection panel, connecting the cable to the specified load through the high voltage lead-out opening of the interconnection panel, and Cables from the charge/discharge stand for the electric vehicle and the inverter device for the solar battery are connected through the low-voltage drawer opening. Cables include power lines and communication and control lines. In addition, the cable can be wired in advance in a pipe buried in the ground.

With the above configuration, installation work of the grid-connected unit can be performed in a relatively short period of time, and construction costs can be reduced.

At least part of the above-described embodiments can be combined arbitrarily.

REFERENCE SIGNS LIST 1 foundation 10 storage battery board 11 storage battery 20 power conversion board 21 storage battery PCS
30 interconnection board 32 VCB
39 ELCBs
33, 133 transformer 36 interconnection control device 41, 42, 43, 44, 45 charging/discharging stand 51, 52, 53, 54, 55 electric vehicle 90 decorative wall 91, 92, 93 doorway 94, 95 opening 101, 102 terminal Tables 125, 215 Air intake/exhaust ports 311, 312 Doors 510, 530 Solar cells 520, 521, 540 Inverter device

Claims (18)

A system interconnection system with a power system having a commercial power supply,
Equipped with a storage battery installed in a parking lot, an AC/DC power converter for the storage battery, a charging and discharging stand for electric vehicles, an inverter device for solar cells , a transformer and a grid connection control device,
The AC/DC power converter, the charge/discharge stand, and the inverter device are connectable to a first load connected to a power line on the secondary side of a step-down transformer of a power system via the transformer,
The interconnection control device is
A system interconnection system that supplies electric power to the first load from at least one of the charging/discharging stand, the inverter device, and the AC/DC power conversion device when the power system is in an emergency. comprising an opening and closing unit for opening and closing an electric circuit between the commercial power supply and the first load;
2. The system interconnection system according to claim 1, wherein, in the event of an emergency in the power system, the switch is opened to disconnect the commercial power supply from the first load. 3. The grid interconnection system according to claim 1, wherein, when said power system is normal, power is supplied from said commercial power supply to said first load and to a second load different from said first load. A first winding connected to the commercial power supply side, a second winding connected to the AC/DC power converter side, and a third winding connected to the charging/discharging stand side and the inverter device side. The system interconnection system according to any one of claims 1 to 3, comprising an interconnection board having the three-winding transformer. The interconnection control device is
When the power system is in an emergency and the power that can be supplied from the charging/discharging stand and the inverter device exceeds the capacity of the first load, surplus power is supplied from the charging/discharging stand and the inverter device to the AC/DC power converter. The interconnection system according to any one of claims 1 to 4. The interconnection control device is
When the power system is in an emergency and the power that can be supplied from the charging/discharging stand and the inverter device is less than the capacity of the first load, both the charging/discharging stand and the inverter device and the AC/DC power conversion device The grid interconnection system according to any one of claims 1 to 5, wherein power is supplied to the first load. A first winding connected to the commercial power supply side and the inverter device side, a second winding connected to the AC/DC power converter side, and a third winding connected to the charging/discharging stand side The system interconnection system according to any one of claims 1 to 3, comprising an interconnection board having the three-winding transformer. The interconnection control device is
When the electric power system is in an emergency and the power that can be supplied from the inverter device exceeds the capacity of the first load, surplus power is supplied from the inverter device to the charging/discharging stand or the AC/DC power conversion device. 8. The interconnection system according to 7. The interconnection control device is
When the power system is in an emergency and the power that can be supplied from the inverter device is less than the capacity of the first load, power is supplied from the inverter device and the charging/discharging stand to the first load, or 9. The system interconnection system according to claim 7, wherein power is supplied to said first load from an inverter device, said charging/discharging stand and said AC/DC power conversion device. The grid interconnection system according to any one of claims 1 to 9, further comprising a notification unit that notifies information about charging/discharging of a battery of an electric vehicle by the charging/discharging stand and discharging of a solar battery by the inverter device. . The interconnection control device is
The grid interconnection system according to any one of claims 1 to 10, wherein the electric vehicle is charged by the charging/discharging station when the power system is normal and the charging mode is set. The interconnection control device is
When the power system is normal and the energy management mode is set, and the power at a receiving point at a predetermined location is equal to or higher than a threshold, power is supplied from the charging/discharging station and the inverter device to the first load and the second load. 11. The grid interconnection system according to any one of claims 1 to 10, wherein power is supplied from the AC/DC power converter to the first load and the second load. The interconnection control device is
When the power system recovers power, the power supplied to the first load from at least one of the charging/discharging stand, the inverter device, or the AC/DC power conversion device is switched to power from the commercial power source without interruption. The interconnection system according to any one of claims 1 to 12. A charging/discharging stand for electric vehicles installed in a parking lot,
a solar battery installed in the parking lot;
an inverter device that is installed in the parking lot and converts the direct current output by the solar cell into alternating current;
and a grid interconnection unit installed in the parking lot,
The system interconnection unit is
a storage battery panel that houses storage batteries;
a power conversion board that houses the AC/DC power conversion device for the storage battery;
An interconnection board that houses an interconnection control device that performs interconnection between the electric power system and the charging/discharging stand or the inverter device ,
The storage battery board, power conversion board and interconnection board are
A grid interconnection system arranged side by side along the length of the parking space . The grid interconnection system according to any one of claims 1 to 14, which is used for business continuity planning. A system interconnection unit with a power system,
A storage battery panel installed in the parking lot and containing a storage battery;
A power conversion board installed in the parking lot and housing the AC/DC power conversion device for the storage battery;
A connection that is installed in the parking lot and houses an interconnection control device that performs system interconnection between the power system and the charging/discharging stand or an inverter device that converts direct current output by the solar battery installed in the parking lot into alternating current. Equipped with a system board and
The storage battery board, power conversion board and interconnection board are
Grid connection units are arranged side by side along the length of the parking space . A system interconnection method with a power system,
A storage battery installed in a parking lot, an AC/DC power converter for the storage battery, a charging/discharging stand for an electric vehicle, a solar battery, an inverter device for the solar battery , a transformer and an interconnection control device,
The AC/DC power converter, the charge/discharge stand, and the inverter device are connectable to a first load connected to a power line on the secondary side of a step-down transformer of a power system via the transformer,
A system interconnection method for supplying electric power to the first load from at least one of the charging/discharging stand, the inverter device, and the AC/DC power conversion device when the power system is in an emergency. A method for installing a system interconnection system with a power system,
A storage battery board that houses a storage battery, a power conversion board that houses an AC/DC power converter for the storage battery, and an interconnection control device that connects the power system to the foundation provided on the ground of the parking lot. Install the interconnecting boards side by side,
A cable from a commercial power source is connected through the high voltage lead-in opening of the interconnection board,
connecting a cable to a predetermined load through the high-voltage drawer opening of the interconnection board;
A cable from a charging/discharging stand for an electric vehicle and an inverter device for a solar battery is connected through the low-voltage drawer opening of the interconnection board,
A method for installing a grid interconnection system , in which the storage battery board, the power conversion board, and the interconnection board are arranged side by side along the vehicle length direction of the parking space .

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