JP2020010443A - System interconnection system, system interconnection unit, and installation method of system interconnection system - Google Patents

Abstract

To provide a system interconnection system, a system interconnection unit, and an installation method a system interconnection system capable of effectively using a limited space in a parking lot.SOLUTION: A system interconnection system 100 with a power system includes: charge/discharge stands 41 to 45 for electric vehicles installed in a parking lot; and a system interconnection unit installed in the parking lot. The system interconnection unit includes: a storage battery panel 10 for housing a storage battery 11; a power conversion panel 20 for housing an AC/DC power conversion device 21 for the storage battery; and an interconnection panel 30 for accommodating an interconnection control device 36 for performing interconnection with a power system.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a system interconnection system, a system interconnection unit, and a method of installing a system interconnection system.

  In the market, a shift from gasoline or hybrid vehicles to electric vehicles such as plug-in hybrid vehicles (PHEV) or electric vehicles (EV) is advancing. Patent Document 1 discloses a V2H (Vehicle to Home) device that connects such an electric vehicle to an electric device used in a house and supplies power to the electric device in the house as an emergency power supply in a disaster or the like. ing.

  On the other hand, electric power distribution services from automobiles to electric power systems are not limited to V2H, but also include services from general households to larger consumers and power networks, such as V2B (Vehicle to Building) or V2G (Vehicle to Grid). To V2X.

JP 2018-61432A

  A battery mounted on an electric vehicle has a large amount of electric power, and the average operating time of the electric vehicle per day is relatively small. For this reason, there is great expectation to supply electric vehicle power to loads such as a power system during a disaster or the like. However, in order to supply electric power to the load, the capacity of the equipment increases, and it may be difficult to install the equipment.

  The present invention has been made in view of such circumstances, and provides a system interconnection system, a system interconnection unit, and a method of installing a system interconnection system that can effectively use limited space in a parking lot. With the goal.

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

  The grid interconnection unit according to the present invention is a grid interconnection unit with an electric power system, and is installed in a parking lot, and a storage battery panel that houses a storage battery, and an AC / DC power conversion for the storage battery that is installed in the parking lot. An electric power conversion board that accommodates a device, and an interconnection board that is installed in the parking lot and accommodates an interconnection control device that performs system interconnection with the electric power system.

  An installation method of a grid interconnection system according to the present invention is a method of installing a grid interconnection system with an electric power system, and includes a storage battery panel that accommodates a storage battery on a foundation provided on the ground of a parking lot, and a storage battery panel for the storage battery. A power conversion panel that houses the AC / DC power conversion device, and a connection panel that houses a connection control device that performs system interconnection with the power system are installed side by side, and from a commercial power supply through a high-voltage inlet opening of the connection panel. , A cable to a predetermined load is connected through a high-pressure outlet of the interconnection panel, and a cable from a charge / discharge stand for an electric vehicle is connected through a low-pressure outlet of the interconnection panel.

  ADVANTAGE OF THE INVENTION According to this invention, the limited space of a parking lot can be used effectively.

It is a schematic diagram which shows an example of an external structure of the system interconnection system of this Embodiment. It is a top view showing an example of installation of a system interconnection system of this embodiment. It is a front view showing an example of installation of a system interconnection system of this embodiment. It is a schematic diagram which shows an example of the conduit tube buried underground. It is a top view which shows the example of arrangement | positioning of the decoration wall installed around the system interconnection unit. FIG. 1 is a schematic diagram illustrating an example of a circuit configuration of a system interconnection system according to an embodiment. It is a schematic diagram which shows the 1st example of the system interconnection when the electric power system by the system interconnection system of this Embodiment is normal. It is a schematic diagram which shows the 2nd example of the grid connection when the electric power system by the grid connection system of this Embodiment is normal. It is a schematic diagram which shows an example of the independent operation | movement at the time of the electric power system by the grid interconnection system of this Embodiment at the time of emergency. It is a schematic diagram which shows an example of the operation switching when the electric power system by the grid connection system of this Embodiment returns from an emergency to a normal time.

  Hereinafter, the present invention will be described with reference to the drawings showing the embodiments. FIG. 1 is a schematic diagram illustrating an example of an external configuration of a system interconnection system 100 according to the present embodiment. In the example of FIG. 1, the parking lot has five parking spaces. The grid interconnection system 100 is a charging / discharging stand 41, 42, 43, 44, 45 for electric vehicles (51, 52, 53, 54, 55) installed in a parking lot, and a grid interconnection installed in a parking lot. It has a unit. The grid interconnection system 100 can be provided as a device for a business continuity plan (BCP). The system interconnection unit includes a storage battery panel 10 containing a storage battery (not shown), a power conversion panel 20 containing a storage battery PCS (Power Conditioning System) (not shown), and an interconnection control device for performing system interconnection with a power system. An interconnection board 30 (not shown) is provided. Note that the number of charge / discharge stands is not limited to five.

  The electric vehicle is a plug-in hybrid vehicle (PHEV) or an electric vehicle (EV), and is also referred to herein as PHEV or EV. The charging / discharging stands 41 to 45 can charge and discharge a battery (on-board storage battery) mounted on the electric vehicle. The storage battery PCS (also referred to as an AC / DC power conversion device) housed in the power conversion board 20 can convert power from AC to DC and from DC to AC in both directions, and the storage battery (stationary (Also referred to as a storage battery). When the power system is normal, the interconnection control device housed in the interconnection board 30 performs system interconnection operation between the power system, the storage battery PCS, and the charging / discharging stations 41 to 45, and when the power system is abnormal (at the time of disaster). , An independent operation by the storage battery PCS and the charging / discharging stands 41 to 45 can be performed.

  By installing the charging / discharging stands 41 to 45, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 (system interconnection unit) in the parking lot, the electric vehicle is operating at the time of disaster, Even when all or a part of the automobile is not parked in the parking lot and the required power cannot be supplied from the charge / discharge stands 41 to 45 to a predetermined load (also referred to as an important load or a first load), the storage battery Since the power of the storage battery can be supplied to the load by the PCS, 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 the present embodiment, and FIG. 3 is a front view showing an example of installation of the grid interconnection system 100 of the present embodiment. In the example of the drawing, it is assumed that the electric vehicle parked in the parking space 501 is not parked among the five parking spaces 501 to 505. Reference numeral 6 denotes a collision prevention pole, and reference numeral 7 denotes a wheel stopper.

  As shown in FIG. 2, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are arranged side by side along the vehicle length direction of the parking space (the direction indicated by the symbol L in the figure). That is, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 can be arranged side by side along the vehicle length direction of the parking space. By arranging the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 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 is provided. The grid interconnection units (the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30) can be arranged, and the site area required for the parking lot including the grid interconnection units can be made compact. In addition, since the distance between the system interconnection unit and the charging / discharging stands 41 to 45 can be shortened, wiring and burial work of power lines and communication / control lines described later can be easily performed, and costs required for the work can be reduced. can do.

  The storage battery panel 10 includes doors 121, 122, and 123 on the front side on the parking space side. The power conversion panel 20 includes an opening / closing door 211 on the front surface on the parking space side. The interconnection board 30 includes opening and closing doors 311 and 312 on the front surface on the parking space side. That is, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 can be installed such that the opening / closing doors provided on the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 face the parking space side. . Each opening / closing door can be opened for maintenance and inspection of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30, so that an operator can work.

  For example, as shown in FIG. 2, the electric vehicle parked in the parking space 501 adjacent to the opening / closing doors of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 is moved from the parking space 501 so that the parking space 501 is By vacating, the parking space 501 can be used as a work space for maintenance and inspection of the system interconnection unit. Thus, it is not necessary to install the system interconnection unit in a state where 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 panel 10 has an intake / exhaust port 125 on the back surface opposite to the parking space. The power conversion panel 20 includes an intake / exhaust port 215 on the back surface opposite to the parking space. The storage battery panel 10 houses a cooling device and a heater (not shown) for managing the temperature of the storage battery in addition to the storage battery. The power conversion board 20 houses a cooling device (not shown) for radiating heat of the storage battery PCS, in addition to the storage battery PCS. By providing an intake / exhaust port on the back side opposite to the parking space, it is possible to suppress the blowing of hot air etc. to the parking lot user and prevent the discomfort to the user it can.

  The storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 can have a plate thickness of 2.3 mm or more. Usually, a metal plate having a plate thickness of about 1.6 mm is used for a cubicle-type high-voltage power receiving facility (also simply referred to as a cubicle). In this case, the fire prevention ordinance requires that the cubicle be installed at least 3 m away from the building. By setting the plate thickness to 2.3 mm or more, the restriction that the separation distance from the building is 3 m or more is removed. For this reason, even in the parking lot adjacent to the building, the location of the grid interconnection unit can be considered without considering the restriction on the separation distance from the building, and the degree of freedom of installation of the grid interconnection unit is increased. As a result, installation becomes easy.

  As shown in FIG. 2, a high-pressure inlet 301 and a high-pressure outlet 302 are formed on the bottom side of the interconnection board 30 on the back side, and a low-pressure outlet 303 is formed on the front side. The high-voltage inlet 301 is wired through a conduit (for example, a rigid polyethylene tube having flexibility) buried underground, and is connected to a power line (high-voltage power line) from a commercial power supply side of a power system, and to a communication line. The control line is pulled in the appropriate length. The high-voltage outlet 302 is wired through a conduit buried underground, and a power line (high-voltage power line) from the load side and a communication / control line are drawn in an appropriate length. The low-pressure outlet 303 is wired through a conduit buried underground, and a suitable length of a ground line, a power line (low-voltage power line) and a communication / control line between the charging / discharging stands 41 to 45 are drawn in.

  FIG. 4 is a schematic diagram illustrating an example of a conduit tube buried underground. In FIG. 4, the figure on the left shows an example of excavation on the low pressure side, and the figure on the right shows an example of excavation on the high pressure side. On the low voltage side, a power line (for example, a CV cable: a crosslinked polyethylene insulated vinyl sheath cable) is wired to each of the five conduits corresponding to the five charging / discharging stands, and 5 corresponding to the five charging / discharging stands. Communication and control lines are wired to each of the individual conduits, and each conduit is buried at a required depth in the ground (for example, 60 cm or more). On the high voltage side, a power line (for example, CV cable) is wired to the conduit, and a communication / control line is wired to another conduit, and each conduit is brought to a required depth in the ground (for example, 60 cm or more). Buried.

  The grid interconnection system 100 of the present embodiment can be installed as follows. That is, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are arranged side by side on the foundation 1 provided on the ground of the parking lot. By inserting a base bolt fixed to the base 1 into a bolt hole formed in a bottom plate (not shown) of each of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30, and fastening a nut, the storage battery panel 10, the power conversion board 20 and the interconnection board 30 can be fixed to the foundation 1.

  When the system interconnection unit is separated into three equipment panels, namely, 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 carried into the installation site. In addition, a large transport vehicle is not required. Further, when the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are lifted and moved to the installation position at the installation site, a large heavy machine is not required. In particular, in the case of installation in a parking lot such as a shopping mall where an unspecified number of customers come and go, it is possible to prevent inconvenience and bad impression from being given to the users. In addition, it is possible to realize compact equipment installation that makes effective use of the limited space of the parking lot.

  Further, a cable from a commercial power supply is connected through a high-pressure outlet 301 of the interconnection board 30, a cable to a predetermined load is connected through a high-pressure outlet 302 of the interconnection board 30, and a low-pressure outlet 303 of the interconnection board 30 is connected. Through the cable from the charging / discharging stands 41 to 45. The cable includes a power line and a communication / control line. Since the line lengths of the low-voltage side wiring and the communication / control line can be assumed by the package design of the system interconnection unit, a line processed in advance can be prepared.

  With the above configuration, the installation work of the system interconnection unit can be performed in a relatively short time, and the construction cost can be reduced.

  Also, a plurality of charge / discharge stands 41 to 45 can be arranged side by side on the foundation 1 provided on the ground of the parking lot. Since the grid interconnection unit is installed adjacent to the parking space, the distance between the grid interconnection unit and the charging / discharging stands 41 to 45 can be shortened. The construction is facilitated, and the cost required for the construction can be reduced.

  FIG. 5 is a plan view showing an arrangement example of the decorative wall 90 installed around the system interconnection unit. As shown in FIG. 5, the decorative wall 90 is provided on the foundation 1 on which the storage battery panel 10, the power conversion panel 20 and the interconnection panel 30 are installed so as to cover the periphery of the storage battery panel 10, the power conversion panel 20 and the interconnection panel 30. Can be installed in The decorative wall 90 can be a display board on which an advertisement, art, and the like are displayed. The decorative wall 90 can be so high that the storage battery panel 10, the power conversion panel 20 and the interconnection panel 30 are not visible. In a shopping mall or a public place, the external appearances of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are likely to give the user some discomfort. Therefore, by covering the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 with the decorative wall 90, it is possible to display information that does not give a user a sense of discomfort and that interests the user. .

  On the front side of the decorative wall 90 on the parking space side, an entrance / exit 93 is provided corresponding to the position of the open / close doors 121, 122, 123 of the storage battery panel 10. An entrance 92 is provided on the front side of the decorative wall 90 on the parking space side in correspondence with the position of the opening / closing door 211 of the power conversion panel 20. An entrance 91 is provided on the front side of the decorative wall 90 on the parking space side in correspondence with the positions of the open / close doors 311 and 312 of the interconnection panel 30. The entrances 91 to 93 may be openable and closable doors, or may be removable wall boards. Thereby, even if the surroundings of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are covered with the decorative wall 90, the maintenance and inspection of the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 can be performed.

  An opening 95 is provided on the back surface of the decorative wall 90 opposite to the parking space, corresponding to the position of the intake / exhaust port 125 of the storage battery panel 10. In addition, an opening 94 is provided on the back surface of the decorative wall 90 opposite to the parking space, corresponding to the position of the air intake / exhaust port 215 of the power conversion board 20. The openings 94 and 95 can be provided with punching or slits. By providing the openings 94 and 95, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are cooled even if the decoration wall 90 covers the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30. be able to.

  In the example of FIG. 5, the decorative wall 90 is entirely covered over the four surfaces around the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30, but is not limited thereto. For example, only two of the four surfaces may be covered. For example, when only two surfaces are covered, two surfaces on the storage battery panel 10 side and the back side can be covered. The storage battery panel 10 side is most easily seen by the user, and the back surface can hide the mismatch in the size of each panel. Further, by using two planes, the cost can be reduced as compared with the case of four planes.

  In the example of FIG. 2, the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 are arranged side by side at a position adjacent to the endmost parking space 501 among the five parking spaces 501 to 505. However, the installation is not limited to the example of FIG. For example, a partition corresponding to approximately one parking space may be provided between the parking space 502 and the parking space 503, and the storage battery panel 10, the power conversion panel 20, and the interconnection panel 30 may be arranged in the partition. .

  FIG. 6 is a schematic diagram illustrating an example of a circuit configuration of the system interconnection system 100 according to the present embodiment. The storage battery panel 10 houses 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 houses a storage battery PCS21, a control device (not shown), a cooling device, and the like. The interconnection board 30 includes a remote IO 31, a VCB 32 as an opening / closing unit, a transformer 33, a UVR 34, an instrument transformer 35, and the like, in addition to the interconnection control device 36.

  The interconnection board 30 includes terminal blocks 101 and 102 and breakers 103, 104, 111 to 115. The terminal block 101 is provided on an electric circuit (high-voltage power supply line) on the high-voltage lead-in side. That is, the power line from the secondary side of the step-down transformer 85 of the power system and the power line from the primary side of the step-down transformer 86 connected to the general load (second load) are connected to the terminal block 101. Here, the general load includes, for example, an electric device that has relatively little effect even if the power is cut off during a disaster.

  The terminal block 102 is provided on an electric circuit (high-voltage power supply line) on the high-voltage extraction side. That is, the power line from the primary side of the step-down transformer 87 connected to the important load (first load) is connected to the terminal block 102. Here, the important load is an important load (important load) for which it is necessary to continuously supply power even in the event of a disaster, such as an emergency elevator, electric equipment that requires continuous operation, lighting of a building, Includes air conditioning equipment and the like.

  One terminal of the VCB 32, the UVR 34, and the instrument transformer 35 are connected to the terminal block 101 via the disconnector 37. The instrument 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 a substance constituting an arc discharge generated between the electrodes when current is interrupted is diffused in high vacuum to interrupt the arc. It is a vessel.

  The UVR 34 is an undervoltage relay, and can detect an abnormality such as a short circuit accident or a power failure on the power system side. When detecting an abnormality, the UVR 34 outputs a control signal to the VCB 32 to cut off the electric circuit of the VCB 32.

  In a building that performs power demand management using the grid interconnection system, a power monitoring unit 80 that monitors the power on the primary side of the step-down transformer 85 is provided. The power monitoring unit 80 is not always essential. When the step-down transformer 85 is not installed, the position monitored by the power monitoring unit 80 is set as appropriate. The power monitoring unit 80 includes an OVGR 81, an RPR / UPR 82, and a power sensor 83. The OVGR 81 is a ground fault overvoltage relay, and continuously detects a ground fault in the power system. The RPR / UPR 82 is a reverse power relay and a power shortage relay, and can detect an abnormality such as a reverse power flow to the power system or a short circuit accident. Even when an abnormality is detected in the OVGR 81 and the RPR / UPR 82, the electric 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 path. The transformer 33 includes a first winding 331, a second winding 332 connected to the breaker 103 via an electric path, and a third winding 333 connected to the breakers 111 to 115 via an electric path.

  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, 50 kVA, and the voltage and power on the second winding 332 side can be, for example, 300 V, 50 kVA. The voltage and power on the third winding 333 side can be, for example, 210 V and 50 kVA, but the voltage and power are not limited to these values. By using the transformer 33 as a three-winding transformer, it is possible to save space and weight as compared with a case where two transformers are provided.

  The storage battery PCS21 is connected to the breaker 103. The storage battery PCS21 can convert electric power in both directions from AC to DC and from DC to AC, and can charge and discharge the storage battery 11.

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

  The power lines from the charge / discharge stands 41 to 45 are connected to the breakers 111 to 115, respectively. The charging / discharging stands 41 to 45 include a conversion circuit that can convert electric power in both directions from AC to DC and from DC to AC, and can charge and discharge a battery mounted on the electric vehicles 51 to 55. .

  Each of the charging / discharging stands 41 to 45 includes a notifying unit (not shown) that notifies information regarding charging and discharging of the batteries of the electric vehicles 51 to 54. The notifying unit may be, for example, a display panel or an indicator light, or may notify a terminal device used by a user or an administrator via wireless communication. The information on charge / discharge includes, for example, an operation state such as preparation for charge / discharge, preparation completion, charge / discharge, charge / discharge completion, a state of charge (SOC) of the battery, a required time for full charge, and a full charge. Information such as the remaining time until, the dischargeable amount, and the charge for charging / discharging can be included. As a result, it is possible to timely grasp information on charging and discharging of the electric vehicle.

  Next, a grid connection method using the grid connection system 100 of the present embodiment will be described.

  FIG. 7 is a schematic diagram showing a first example of system interconnection when the electric power system is normal by the interconnection system 100 of the present embodiment. The interconnection control device 36 can charge the electric vehicles 51 to 55 by the charge / discharge stands 41 to 45 when the power system is normal and the charging mode is set. Thus, the system interconnection system 100 can be used as a rapid charging / discharging station for an electric vehicle.

  Also, although not shown, when the power system is normal, power is supplied from the commercial power supply to the important load. When the power system is normal, power is supplied from a commercial power supply to a general load.

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

  FIG. 8 is a schematic diagram illustrating a second example of the system interconnection when the power system is normal by the interconnection system 100 of the present embodiment. The interconnection control device 36 detects, for example, with the power sensor 83 when the power receiving point power at a predetermined location is equal to or greater than a threshold value in a state where the power system is normal and in the energy management mode (energy management mode). When the power is equal to or higher than the threshold, the power is supplied from the charge / discharge stations 41 to 45 to the important load and the general load, or the power is supplied from the storage battery PCS21 to the important load and the general load so that the power becomes equal to or lower than the threshold. Thereby, peak cut operation of electric power becomes possible. When the power at the power receiving point at the predetermined location is equal to or smaller than the threshold, power can be supplied from the power system to the charging / discharging stations 41 to 45 or the storage battery PCS21 within a range not exceeding the threshold.

  FIG. 9 is a schematic diagram illustrating an example of self-sustaining operation when the power system by the grid interconnection system 100 according to the present embodiment is in an emergency. When the power system is in emergency, the interconnection control device 36 opens the electrode of the VCB 32 to disconnect the commercial power supply from the important load. In this state, by supplying power from the charging / discharging stations 41 to 45 or the storage battery PCS21, it is possible to enable the interconnection control device 36 to operate independently.

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

  When the interconnection control device 36 performs an independent 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 the charging / discharging stations 41 to 45 being linked to the storage battery PCS21 operating as a voltage source and operating as a current source.

  With the above-described configuration, even when the electric vehicle is operating at the time of a disaster and the required power cannot be supplied from the charge / discharge stands 41 to 45 to the important load, power can be supplied from the storage battery PCS21 to the important load. Therefore, required power can be supplied to the important load 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 stations 41 to 45 exceeds the capacity of the important load, the interconnection control device 36 transmits the storage battery PCS21 from the charging / discharging stations 41 to 45. To supply surplus power. Thereby, when the electric vehicle is parked in the parking space and is not operating, the electric power of the electric vehicle can be effectively used.

  When the power system is in an emergency and the power that can be supplied from the charging / discharging stations 41 to 45 is less than the capacity of the important load, the interconnection control device 36 controls Supply power to the load. For example, when the capacity of the important load is 50 kVA and the power of 30 kVA can be supplied from the charging / discharging stations 41 to 45 in total, the power of 20 kVA is supplied from the storage battery PCS21 and the voltage from the high voltage side of the transformer 33 is increased. 50 kVA of power can be supplied to critical loads. When the capacity of the important load changes, only power suitable for the capacity of the important load can be supplied. Accordingly, when all or a 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 power supply system has an important load. The required power can be supplied.

  FIG. 10 is a schematic diagram illustrating an example of operation switching when the power system returns from an emergency to a normal state by the grid interconnection system 100 of the present embodiment. When the power system is restored, the interconnection control device 36 switches the power supplied from at least one of the charging / discharging stations 41 to 45 or the storage battery PCS21 to the important load to the power from the commercial power supply without any interruption. The instantaneous interruption switching is performed, for example, by detecting the phase of the commercial power supply with the instrument transformer 35 and closing the electrode 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 reducing the power from the commercial power supply. Supply critical loads.

  After the commercial power supply is reconnected to the important load without an instantaneous interruption, the interconnection control device 36 stops the operations of the charge / discharge stands 41 to 45 and the storage battery PCS21, and ends the self-sustaining operation. Since the storage battery PCS21 performs voltage control, instantaneous interruption switching can be performed. Thereafter, the interconnection control device 36 can restart the charging / discharging stands 41 to 45 and the storage battery PCS21 in order to perform the interconnection. Thereby, stable power can be supplied to the important loads by synchronizing the phases and switching without instantaneous interruption.

  In the above-described embodiment, the connection of the power system is performed at a high voltage of 6600 V. However, the present invention is not limited to this, and the connection may be performed at a low voltage. When the voltage is low, the voltage and the power (apparent power) on the first winding 331 side of the transformer 33 can be set to, for example, 210 V and 49 kVA. The voltage and power (apparent power) on the 332 side can be, for example, 300 V and 49 kVA, and the voltage and power (apparent power) on the third winding 333 side can be, for example, 210 V and 49 kVA. Further, the transformer is not limited to the three-winding transformer, and may be configured to include two two-winding transformers.

  The grid interconnection system of the present embodiment is a grid interconnection system with an electric power system, and includes a charge / discharge stand for an electric vehicle installed in a parking lot, and a grid interconnection unit installed in the parking lot. Wherein the grid interconnection unit houses a storage battery panel that houses a storage battery, a power conversion panel that houses an AC / DC power conversion device for the storage battery, and an interconnection control device that performs grid interconnection with the power system. And an interconnection board to perform.

  The grid interconnection unit of the present embodiment is a grid interconnection unit with a power system, and is installed in a parking lot, and a storage battery panel that stores a storage battery, and an AC / DC power supply that is installed in the parking lot and is used for the storage battery. A power conversion board that houses a conversion device; and a connection board that is installed in the parking lot and houses a connection control device that performs system interconnection with the power system.

  The grid interconnection system includes a charge / discharge stand for an electric vehicle installed in a parking lot and a grid interconnection unit installed in a parking lot. The grid interconnection unit includes a storage battery panel that houses the storage battery, a power conversion panel that houses the AC / DC power conversion device for the storage battery, and an interconnection board that houses the interconnection control device that interconnects the power grid. Prepare. The charging / discharging stand can charge and discharge a battery (vehicle storage battery) mounted on an electric vehicle (PHEV or EV). The AC / DC power converter can convert power from AC to DC and from DC to AC in both directions, and can charge and discharge a storage battery (also referred to as a stationary storage battery). The interconnection control device performs a system interconnection operation between the power system, the AC / DC power conversion device, and the charging / discharging station when the power system is normal, and when the power system is abnormal (at the time of disaster), the AC / DC power conversion device and the charging device are charged. Perform autonomous operation using a discharge stand.

  By installing the charging / discharging stand and the grid interconnection unit in the parking lot, the electric vehicle is operating at the time of disaster, so all or part of the electric vehicle is not parked in the parking lot, and the charging / discharging stand Even when the required power cannot be supplied to the load from the power supply, the power of the storage battery can be supplied to the load by the AC / DC power converter, so that the required power can be supplied to the load as a whole.

  In the system interconnection system of the present embodiment, the storage battery panel, the power conversion panel, and the interconnection panel are arranged side by side along the vehicle length direction of the parking space.

  The storage battery panel, the power conversion panel, and the interconnection panel are arranged side by side along the vehicle length direction of the parking space. By arranging the storage battery panel, the power conversion panel, and the interconnection panel along the vehicle length direction of the parking space arranged for each electric vehicle in the parking lot, for example, system interconnection to a parking space for about one electric vehicle The units can be arranged, and the site area required for the parking lot including the system interconnection unit can be made compact. Further, since the distance between the system interconnection unit and the charging / discharging stand can be shortened, wiring and burying work of the power line and the communication line can be easily performed, and costs required for the work can be reduced.

  In the system interconnection system of the present embodiment, the storage battery panel, the power conversion panel, and the interconnection panel include an opening / closing door on a front surface on the parking space side.

  The storage battery panel, the power conversion panel, and the interconnection panel have an opening / closing door on the front side on the parking space side. The opening and closing door is opened by a worker during maintenance and inspection of the storage battery panel, the power conversion panel, and the interconnection panel. For example, by moving an electric vehicle parked in a parking space adjacent to each of the open / close doors of the storage battery panel, the power conversion panel, and the interconnection panel from the parking space, and opening the parking space, the parking space is connected to the system interconnection unit. It can be used as a work space for maintenance and inspection. Thus, it is not necessary to install the system interconnection unit in a state where a work space for maintenance and inspection is secured in advance, and the occupied area including the work space can be reduced.

  In the system interconnection system of the present embodiment, the storage battery panel and the power conversion panel include an intake / exhaust port on the back surface opposite to the parking space.

  The storage battery panel and the power conversion panel are provided with intake and exhaust ports on the back surface opposite to the parking space. The storage battery panel houses, in addition to the storage battery, a cooling device and a heater for controlling the temperature of the storage battery. In addition, the power conversion board houses a cooling device for radiating heat of the AC / DC power converter, in addition to the AC / DC power converter. By providing the air intake / exhaust port on the back side opposite to the parking space, it is possible to prevent the user of the parking lot from feeling uncomfortable.

  In the system interconnection system of the present embodiment, the storage battery panel, the power conversion panel, and the interconnection panel have a plate thickness of 2.3 mm or more.

  The storage battery panel, the power conversion panel, and the interconnection panel have a plate thickness of 2.3 mm or more. Usually, a metal plate having a plate thickness of about 1.6 mm is used for a cubicle-type high-voltage power receiving facility (also simply referred to as a cubicle). In this case, the fire prevention ordinance requires that the cubicle be installed at least 3 m away from the building. By setting the plate thickness to 2.3 mm or more, the restriction that the separation distance from the building is 3 m or more is removed. For this reason, even in the parking lot adjacent to the building, the location of the grid interconnection unit can be considered without considering the restriction on the separation distance from the building, and the degree of freedom of installation of the grid interconnection unit is increased. As a result, installation becomes easy.

  In the grid interconnection system according to the present embodiment, when the power system is in an emergency, the switching unit is opened to disconnect the commercial power supply from the predetermined load.

  The grid connection system disconnects a commercial power supply from a predetermined load by opening a switching unit when the power system is in an emergency. Thereby, independent operation by the interconnection control device can be enabled.

  In the grid interconnection system of the present embodiment, the interconnection control device supplies power to the predetermined load from at least one of the charging / discharging stand or the AC / DC power conversion device when the power system is in an emergency.

  The interconnection control device supplies power to a predetermined load from at least one of the charging / discharging stand and the AC / DC power conversion device when the power system is in an emergency. The predetermined load is an important load (important load) for which it is necessary to continuously supply power even in the event of a disaster, for example, an emergency elevator, electric equipment that requires continuous operation, building lighting and air conditioning equipment. And so on.

  With the above-described configuration, even when the electric vehicle is operating at the time of disaster and the required power cannot be supplied from the charge / discharge stand to the predetermined load, the power is supplied from the AC / DC power converter to the predetermined load. Therefore, the required power can be supplied to the load as a whole.

  In the grid interconnection system according to the present embodiment, the interconnection control device is configured to perform the charge / discharge when the power system is in an emergency and the power that can be supplied from the charge / discharge station exceeds the capacity of the predetermined load. Surplus power is supplied from the stand to the AC / DC power converter.

  The interconnection control device supplies surplus power to the AC / DC power conversion device from the charge / discharge stand when the power that can be supplied from the charge / discharge stand exceeds the capacity of a predetermined load (important load) when the power system is in an emergency. . Thereby, when the electric vehicle is parked in the parking space and is not operating, the electric power of the electric vehicle can be effectively used.

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

  When the power supply system is in an emergency and the power that can be supplied from the charging / discharging station is less than the capacity of a predetermined load (important load) when the power system is in an emergency, the predetermined load from both the charging / discharging station and the AC / DC power conversion device To supply power. In this way, when all or a part of the required number of electric vehicles are not parked in the parking space and are in operation, the insufficient power can be supplied from the AC / DC power converter, and the required Power can be supplied.

  The grid interconnection system according to the present embodiment is provided on a foundation on which the grid interconnection unit is installed, and includes a decorative wall that covers the periphery of the grid interconnection unit.

  A decorative wall is installed on the foundation on which the grid interconnection unit is installed so as to cover the periphery of the grid interconnection unit. The decorative wall can be a display panel on which an advertisement, art, or the like is displayed. The decorative wall can be so high that the grid connection system is not visible. In a shopping mall or a public place, the appearance of the grid connection system is likely to give a user a sense of discomfort. Therefore, by covering the system interconnection unit with the decorative wall, it is possible to display information that does not give the user a sense of incongruity and that is interesting to the user.

  In the system interconnection system of the present embodiment, the front side of the decorative wall on the parking space side can be opened and closed.

  The front side of the decorative wall on the parking space side can be opened and closed. Thereby, even if the surroundings of the grid interconnection system are covered with the decorative wall, maintenance and inspection can be performed.

  In the system interconnection system of the present embodiment, an opening for intake and exhaust is provided on the back surface of the decorative wall opposite to the parking space.

  The back of the decorative wall opposite to the parking space is provided with an opening for intake and exhaust. Thereby, even if the periphery of the system interconnection system is covered with the decorative wall, the system interconnection unit can be cooled.

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

  Thereby, the grid interconnection system can be provided as a device for a business continuity plan (BCP).

  The method of installing the grid interconnection system of the present embodiment is a method of installing a grid interconnection system with an electric power system, and a storage battery panel that accommodates a storage battery on a foundation provided on the ground of a parking lot. A power conversion panel accommodating an AC / DC power conversion apparatus and a connection panel accommodating an interconnection control apparatus for system interconnection with the power system are installed side by side, and a commercial power supply is supplied through a high-pressure inlet opening of the interconnection panel. And a cable from a charging / discharging stand for an electric vehicle is connected through a high-pressure extraction opening of the interconnection panel and a cable to a predetermined load through a low-pressure extraction opening of the interconnection panel. .

  The installation method of the grid interconnection system includes a storage battery panel containing a storage battery, a power conversion panel containing an AC / DC power conversion device for the storage battery, and a grid connection with the power grid on a foundation provided on the ground of the parking lot. The interconnection boards that accommodate the interconnection control devices to be performed are arranged side by side. By separating the grid interconnection unit into three equipment panels, a storage battery panel, a power conversion panel, and an interconnection panel, a large transport vehicle can be used to carry the storage battery panel, power conversion panel, and interconnection panel into the installation site. Becomes unnecessary. In addition, when the storage battery panel, the power conversion panel, and the interconnection panel are lifted and moved to the installation position at the installation site, a large heavy machine is not required. In particular, in the case of installation in a parking lot such as a shopping mall where an unspecified number of customers come and go, it is possible to prevent inconvenience and bad impression from being given to the users.

  To install the grid interconnection system, connect the cable from the commercial power supply through the high-voltage lead-out opening of the interconnection panel, connect the cable to the specified load through the high-voltage exit opening of the interconnection panel, The cable from the charging / discharging stand for the electric vehicle is connected through the low-pressure outlet. The cable includes a power line and a communication / control line. The cable can be wired in a pipe buried in advance in the ground.

  With the above configuration, the installation work of the system interconnection unit can be performed in a relatively short time, and the construction cost can be reduced.

  In the installation method of the system interconnection system of the present embodiment, the storage battery panel, the power conversion panel, and the interconnection panel are arranged side by side along the vehicle length direction of the parking space.

  As a method for installing the grid interconnection system, a storage battery panel, a power conversion panel, and an interconnection panel are arranged side by side along the vehicle length direction of the parking space. By arranging the storage battery panel, the power conversion panel, and the interconnection panel along the vehicle length direction of the parking space arranged for each electric vehicle in the parking lot, for example, system interconnection to a parking space for about one electric vehicle The units can be arranged, and the site area required for the parking lot including the system interconnection unit can be made compact. Further, since the distance between the system interconnection unit and the charging / discharging stand can be shortened, wiring and burying work of the power line and the communication line can be easily performed, and costs required for the work can be reduced.

  The installation method of the grid interconnection system according to the present embodiment includes the storage battery panel, the power conversion panel, and the interconnection panel such that opening / closing doors provided on the storage battery panel, the power conversion panel, and the interconnection panel respectively face the parking space. Install the system board.

  The method of installing the grid interconnection system is to install the storage battery panel, the power conversion panel, and the interconnection panel such that the open / close doors provided on the storage battery panel, the power conversion panel, and the interconnection panel respectively face the parking space. The opening and closing door is opened by a worker during maintenance and inspection of the storage battery panel, the power conversion panel, and the interconnection panel. For example, by moving an electric vehicle parked in a parking space adjacent to each of the open / close doors of the storage battery panel, the power conversion panel, and the interconnection panel from the parking space, and opening the parking space, the parking space is connected to the system interconnection unit. It can be used as a work space for maintenance and inspection. Thus, it is not necessary to install the system interconnection unit in a state where a work space for maintenance and inspection is secured in advance, and the occupied area including the work space can be reduced.

  In the installation method of the system interconnection system according to the present embodiment, a plurality of the charging / discharging stands are arranged and installed on a foundation provided on the ground of the parking lot.

  The grid connection system is installed by arranging a plurality of charge / discharge stands side by side on a foundation provided on the ground of a parking lot. Accordingly, the distance between the grid interconnection unit and the charging / discharging stand can be shortened, so that the wiring and burial work of the power line and the communication line can be easily performed, and the cost required for the work can be reduced.

  Note that at least a part of the above embodiments can be arbitrarily combined.

DESCRIPTION OF SYMBOLS 1 Basic 10 Storage battery panel 11 Storage battery 20 Power conversion board 21 Storage battery PCS
30 interconnection board 32 VCB
33 Transformer 36 Interconnection control device 41, 42, 43, 44, 45 Charge / discharge stand 51, 52, 53, 54, 55 Electric vehicle 90 Decorative wall 91, 92, 93 Entrance 94, 95 Opening 101, 102 Terminal block 125 215 Inlet / exhaust port 311 312 Door

Claims (18)

A grid interconnection system with a power grid,
A charge / discharge stand for electric vehicles installed in a parking lot,
And a grid interconnection unit installed in the parking lot,
The system interconnection unit includes:
A battery panel that houses the batteries,
A power conversion board that houses the AC / DC power conversion device for the storage battery,
And a connection board accommodating a connection control device that performs system connection with the power system. The storage battery panel, power conversion panel and interconnection panel,
The system interconnection system according to claim 1, wherein the system interconnection system is arranged along the vehicle length direction of the parking space. The storage battery panel, power conversion panel and interconnection panel,
The system interconnection system according to claim 2, further comprising an opening / closing door on a front surface on the parking space side. The storage battery panel and the power conversion panel,
4. The system interconnection system according to claim 2, wherein an intake / exhaust port is provided on a back surface opposite to the parking space. 5. The storage battery panel, power conversion panel and interconnection panel,
The grid interconnection system according to any one of claims 2 to 4, wherein the plate thickness is 2.3 mm or more.   The system interconnection system according to any one of claims 1 to 5, wherein, when the power system is in an emergency, the switching unit is opened to disconnect a commercial power supply from a predetermined load. The interconnection control device,
The system interconnection system according to claim 6, wherein when the power system is in an emergency, power is supplied to the predetermined load from at least one of the charging / discharging stand and the AC / DC power conversion device. The interconnection control device,
7. The power supply system according to claim 6, wherein when the power system is in an emergency, when the power that can be supplied from the charging / discharging station exceeds the capacity of the predetermined load, surplus power is supplied from the charging / discharging station to the AC / DC power converter. Item 8. The system interconnection system according to Item 7. The interconnection control device,
When the power system is in an emergency, when the power that can be supplied from the charge / discharge stand is less than the capacity of the predetermined load, power is supplied to the predetermined load from both the charge / discharge stand and the AC / DC power conversion device. The system interconnection system according to any one of claims 6 to 8.   The system interconnection system according to any one of claims 1 to 9, further comprising a decorative wall installed on a foundation on which the system interconnection unit is installed and covering a periphery of the system interconnection unit.   The system interconnection system according to claim 10, wherein a front surface of the decorative wall on a parking space side can be opened and closed.   The system interconnection system according to claim 10 or 11, wherein an opening for intake and exhaust is provided on a back surface of the decorative wall opposite to the parking space.   The system interconnection system according to any one of claims 1 to 12, which is used for business continuity planning. A grid interconnection unit with a power grid,
A storage battery panel installed in a parking lot and containing a storage battery,
A power conversion panel installed in the parking lot and accommodating the AC / DC power conversion device for the storage battery,
A connection panel that is installed in the parking lot and houses a connection control device that performs system connection with the power system. A method of installing a grid interconnection system with a power grid,
On a foundation provided on the ground of the parking lot, a storage battery panel for storing a storage battery, a power conversion panel for storing the AC / DC power conversion device for the storage battery, and an interconnection control device for system interconnection with the power system are housed. And install the interconnection boards
A cable from a commercial power supply is connected through a high-pressure inlet opening of the interconnection panel,
Connecting a cable to a predetermined load through a high-pressure extraction opening of the interconnection board;
A method of installing a system interconnection system for connecting a cable from a charge / discharge stand for an electric vehicle through a low-pressure extraction opening of the interconnection panel.   The installation method of the grid interconnection system according to claim 15, wherein the storage battery panel, the power conversion panel, and the interconnection panel are arranged side by side along a vehicle length direction of the parking space.   17. The storage battery panel, the power conversion panel, and the interconnection panel are installed such that the open / close doors provided on each of the storage battery panel, the power conversion panel, and the interconnection panel face the parking space side. How to install a grid interconnection system.   The installation method of the grid interconnection system according to any one of claims 15 to 17, wherein a plurality of the charging / discharging stands are arranged and installed on a foundation provided on the ground of the parking lot.

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