Power supply system and power supply method

Abstract

To provide a power supply system, in which a huge installation space is not required, a large-scaled transforming facility is not required and charging to a large number of electric vehicles can be performed.SOLUTION: A power supply system includes: a first acquisition unit that acquires charge request information including the remaining battery level of an electric vehicle from a terminal device in response to an operation input from a user; and a charging control unit that controls charging the electric vehicle required to be charged according to power reception request information obtained based on a difference between a prescribed value of power to be supplied to a facility and the power used by a load in the facility.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply system and a power supply method. [Background technology]

[0002] As electric vehicles become more widespread, charging equipment for electric vehicles is becoming essential in the parking lots of residential towers and other buildings. Known types of charging equipment for electric vehicles include quick charging equipment and normal charging equipment. Patent Document 1 proposes a system that switches the number of power conversion units connected to an electric vehicle depending on the charging and discharging power of the electric vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-110870 A Summary of the Invention [Problem to be solved by the invention]

[0004] Although quick charging equipment makes it easy to control charging and discharging, it is very expensive and requires a lot of space, which makes it difficult to secure the space to install quick chargers in large parking lots such as those of tower apartment buildings.

[0005] Standard charging equipment can be installed in ordinary detached houses, apartment buildings, and commercial buildings. However, in a large parking lot such as a tower apartment building, if it is assumed that more than 100 electric vehicles will be charged at the same time, large-scale substation equipment will be required, and the contracted power will increase, resulting in a huge cost burden.

[0006] In view of the above-mentioned problems, an object of the present invention is to provide a power supply system and a power supply method that do not require installation space, do not need large-scale substation equipment, and are capable of charging a large number of electric vehicles. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a power supply system that supplies power obtained from a commercial power supply system to at least one of a load in a facility and a plurality of electric vehicles to charge the electric vehicle, the power supply system including: a first acquisition unit that acquires, from a terminal device in response to an operation input from a user, charging request information including a remaining battery charge of the electric vehicle; and a second acquisition unit that acquires, from a terminal device in response to an operation input from a user, charging request information including a remaining battery charge of the electric vehicle, based on a difference between a specified value of power to be supplied to the facility and the power used by the load in the facility. Charge obtained The charging control unit controls charging of the electric vehicle for which charging is requested in accordance with the request information.

[0008] A power supply method according to one aspect of the present invention is a power supply method for supplying power obtained from a commercial power supply system to at least one of a load in a facility and a plurality of electric vehicles to charge the electric vehicle, the power supply method including the steps of: acquiring, from a terminal device, charging request information including a remaining battery charge of the electric vehicle in response to an operation input from a user; and calculating a charging request information including a remaining battery charge of the electric vehicle based on a difference between a specified value of power to be supplied to the facility and a power usage of the load in the facility. Charge obtained and controlling charging of the electric vehicle for which charging has been requested in accordance with the request information. Effect of the Invention

[0009] According to the present invention, even in a large parking lot, a huge amount of installation space is not required, and a large number of electric vehicles can be charged without using large-scale transforming facilities. [Brief description of the drawings]

[0010] [Figure 1] 1 is an explanatory diagram illustrating an overview of a power supply system according to an embodiment of the present invention. [Diagram 2] 2 is an explanatory diagram of a specific configuration of a substation facility and a distribution board in the power supply system according to the embodiment of the present invention. FIG. [Diagram 3]FIG. 4 is an explanatory diagram of a registration screen in the power supply system according to the embodiment of the present invention. [Figure 4] 4 is a flowchart used to explain charging control in the power supply system according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an explanatory diagram showing an outline of a power supply system according to an embodiment of the present invention.

[0012] As shown in FIG. 1, a power supply system 1 according to an embodiment of the present invention includes a power receiving and transforming facility 11, distribution boards 12, 12, . . . , and a control system 13.

[0013] The power receiving and transforming equipment 11 receives high voltage power (e.g., 6.6 kV) from a commercial power system 19 and converts it into low voltage power (e.g., 100 / 200 V). The power receiving and transforming equipment 11 is installed in a common area of ​​a facility 10 such as an apartment building, in a location that is easy to inspect and unlikely to be damaged by floods, fires, etc. The low voltage power converted by the power receiving and transforming equipment 11 is sent to loads of the facility 10, such as lighting, air conditioning, outlets, elevators, water supply and drainage pumps, and also to distribution boards 12, 12, ...

[0014] Outlets 14, 14, ... are led out from the distribution boards 12, 12, .... The outlets 14, 14, ... are, for example, 200V20A outlets for electric vehicles, and are provided for each parking space for an electric vehicle 15. The distribution boards 12, 12, ... are provided on multiple surfaces for one substation equipment 11, for example. If ten distribution boards 12, 12, ... are provided for the substation equipment 11, and ten outlets 14, 14, ... are arranged on one distribution board 12, for example, this equipment can install outlets 14, 14, ... for (10 x 10 = 100) vehicles. The distribution boards 12, 12, ... for electric vehicles may be configured using other distribution boards, for example, a distribution board for lighting.

[0015] The electric vehicles 15, 15, ... are driven by motors using the power source of batteries as energy. When charging the batteries of the electric vehicles 15, 15, ..., the plugs 16, 16, ... of the electric vehicles 15, 15, ... are attached to the outlets 14, 14, .... The electric vehicle 15 may be not only an EV (Electric Vehicle) but also a PHV (Plug-in Hybrid Electric Vehicle).

[0016] The control system 13 performs comprehensive energy management. The control system 13 is, for example, a cloud BEMS (Building and Energy Management System). The cloud BEMS is a system that can centrally manage energy usage and the operating status of various equipment. Furthermore, the cloud BEMS can use terminal devices 17, 17, ... to obtain information on power usage in real time and control energy equipment such as air conditioners and lighting.

[0017] The terminal devices 17, 17, ... are terminals owned by users of the parking lot. The terminal devices 17, 17, ... can be connected to the control system 13 via a network 18. Note that the terminal devices 17, 17, ... may be smartphones, tablet terminals, PCs (Personal Computers), etc.

[0018] FIG. 2 is an explanatory diagram of a specific configuration of the power receiving and transforming equipment 11 and the distribution board 12 in the power supply system 1 according to the embodiment of the present invention.

[0019] As shown in FIG. 2, the substation equipment 11 includes a cable head 101, a disconnecting switch (DS) 102, a high-voltage vacuum circuit breaker (VCB) 103, a demand meter (DM) 104, a series reactor 105, a phase-advancing capacitor 106, a high-voltage AC load break switch (LBS) 107, a transformer 108, and a molded-case circuit breaker (MCCB) 109.

[0020] The cable head 101 receives a high-voltage power supply of, for example, 6.6 kV. The disconnector (DS) 102 opens and closes the high-voltage circuit to inspect and repair the equipment. The high-voltage vacuum circuit breaker (VCB) 103 cuts off the current when the current in the circuit becomes excessive. The demand meter (DM) 104 acquires a demand value from the instantaneous power consumption per hour. The acquired demand value is sent to the control system 13. The series reactor 105 and the leading-phase capacitor 106 improve the power factor. The high-voltage AC load break switches (LBS) 107, 107, ... energize and open and close the high-voltage circuit. The transformers 108, 108, ... convert the 6.6 kV high-voltage power supply into, for example, a (100V / 200V) single-phase three-wire AC power supply or, for example, a 200V three-phase AC power supply. The molded case circuit breakers (MCCBs) 109, 109, . . . cut off the electric circuit when an overload, a short circuit, or the like occurs in the low-voltage circuit.

[0021] The distribution board 12 includes a breaker 201, a current transformer (CT) 202, and a magnet switch 203.

[0022] The breaker 201 cuts off the electric circuit when a short circuit or earth leakage occurs in the building. A current transformer (CT) 202 and a magnetic switch 203 are connected between the breaker 201 and each of the multiple outlets 14. The current transformer 202 measures the current used by the device connected to the outlet 14. The measured current value is sent from the current transformer 202 to the control system 13. The magnetic switch 203 opens and closes based on a control signal indicating ON or OFF supplied from the control system 13, thereby turning on and off the path for supplying power to the outlet 14. In this way, the power supply to the load connected to the outlet 14 is controlled.

[0023] Fig. 3 is an explanatory diagram of a registration screen in the power supply system 1 according to the embodiment of the present invention. When a user of an electric vehicle 15 uses a parking lot, the user registers a charging request on a registration screen as shown in Fig. 3, for example, using a terminal device 17. As shown in Fig. 3, the registration screen 300 includes a profile input field 301, a battery remaining capacity input field 302, and a charging period target setting field 303.

[0024] In the profile input field 301, profile information such as the user's name, the model of the electric vehicle, the installed battery capacity, the number of the parking lot to be used, etc. is input. The input profile information is sent to the control system 13. Note that if the location of the parking lot to be used by the user and the model of the electric vehicle have been decided, the profile information may be input only the first time.

[0025] The input field 302 for the remaining battery charge is a selection screen that allows the user to select from 10% or less, 20% to 50%, 50% to 80%, or 80% or more. When parking, the user of the electric vehicle 15 inputs the remaining battery charge of their own electric vehicle 15 by selecting one of the options from the selection screen. The input information on the remaining battery charge is sent to the control system 13.

[0026] The charging period target setting field 303 is a selection screen that allows the user to select one of "fully charge as soon as possible," "fully charge within three days," "fully charge within one week," and "no charging required." When parking, the user of the electric vehicle 15 inputs the battery charging period target of the electric vehicle 15 by selecting one of the options from the selection screen. The inputted charging period target is sent to the control system 13. The charging period target may be reflected in the usage fee. For example, when "fully charge as soon as possible" is selected, it is considered that the usage fee is set higher than when "fully charge within three days" is selected. In other words, the usage fee may be set higher the shorter the period until full charging.

[0027] Once registration is complete, the control system 13 controls charging of the battery of the target electric vehicle 15.

[0028] FIG. 4 is a flowchart used to explain charging control in the power supply system 1 according to the embodiment of the present invention.

[0029] (Step S101) The control system 13 acquires information on a charging request input by a user using the terminal devices 17, 17, . . .

[0030] (Step S102) The control system 13 acquires information on the remaining battery capacity from the registration information entered by the user, and calculates the charge amount until the battery of each user's electric vehicle 15 is fully charged. That is, as shown in FIG. 3, when the user of the electric vehicle 15 uses a parking lot, the user enters the model of the user's electric vehicle 15 and information on the remaining battery capacity. The capacity of the battery installed in the electric vehicle 15 is determined according to the model and specifications. Therefore, if the model of the electric vehicle 15 and information on the remaining battery capacity can be acquired, the control system 13 can calculate the charge amount (Ah) and charging time until full charge.

[0031] (Step S103) The control system 13 calculates and predicts the amount of power that can be allocated to charging electric vehicles from the difference between the specified value of power (contract power) to be supplied to the entire facility 10 and the calculated value of the current power usage of loads such as lighting and air conditioning in the facility 10. In this embodiment, as shown in Fig. 2, the demand value from the demand meter 104 is sent to the control system 13. The accuracy of the calculated value of the current power usage of the load in the facility 10 can be improved by performing daily learning of demand predictions for each time period.

[0032] (Step S104) The control system 13 determines the priority order among the electric vehicles 15, 15, ... to be charged. In determining the priority order, the control system 13 refers to the input value in the target charging period setting field 303, and sets the priority order so that "fully charge as soon as possible" has the highest priority, "fully charge within three days" has the next highest priority, and then "fully charge within one week" and "no charging required" have decreasing priority.

[0033] (Step S105) The control system 13 turns on / off the magnet switches 203, 203, ... in rotation according to the priority. That is, the control system 13 determines the number of electric vehicles 15, 15, ... that can be charged based on the amount of power that can be allocated to charging the electric vehicles obtained in step S103, and turns on the magnet switches 203, 203, ... in a combination based on this number. Then, the control system 13 changes the combination of the magnet switches 203, 203, ... that are turned on so that all electric vehicles 15, 15, ... that are the target of charging can be charged. At this time, the control system 13 determines the combination of the magnet switches 203, 203, ... that are turned on according to the priority obtained in step S104. That is, in the case of "full charge as soon as possible", the combination of the magnet switches 203, 203, ... that are turned on is set so that the electric vehicle 15 is selected as much as possible. In the case of "full charge within three days", the combination of the magnet switches 203, 203, ... that are turned on is set so that the electric vehicle 15 is fully charged after a specified period of time. In addition, frequent on / off of the magnet switches 203, 203, . . . places a burden on the electric vehicle 15, so it is desirable to limit the number of times that the magnet switches 203, 203, .

[0034] (Step S106) While the magnet switch 203 is on, the control system 13 acquires a measurement value of the charging current to the battery of the electric vehicle 15 from the current transformer (CT) 202, and also acquires the current-flow time of the magnet switch 203. If the charging current to the batteries of the electric vehicles 15, 15, ... and the current-flow time can be acquired, the amount of charge to the batteries of the target electric vehicles 15, 15, ... can be calculated. (Step S107) The control system 13 corrects the amount of power usage in the building (facility 10) and the surplus power (the difference between the contracted power and the current amount of power usage in the facility 10) based on expected values ​​or actual measured results.

[0035] (Step S108) The control system 13 compares the charge amount until full charge acquired in step S102 with the current measurement value and current flow time acquired in step S106, and determines whether or not there are any electric vehicles 15, 15, ... that have reached the charge amount until full charge. If there are no electric vehicles 15, 15, ... that have reached full charge (step S108: No), the control system 13 returns the process to step S105 and continues charging. If the control system 13 determines that there are electric vehicles 15, 15, ... that have reached full charge (step S108: Yes), the process proceeds to step S109.

[0036] (Step S109) The control system 13 ends the charging process of the electric vehicles 15, 15, . . . that are fully charged, and stops the supply of power to the electric vehicles 15, 15, .

[0037] (Step S110) The control system 13 calculates fees for the fully charged electric vehicles 15, 15, ... from the history of power supply time, and determines the amount to be charged for each user. As mentioned above, the usage fee may be determined by reflecting the setting of the target charging period. For example, if "Fully charge as soon as possible" is selected, the basic fee and usage fee per power supply hour can be set higher than if "Fully charge within 3 days" is selected.

[0038] (Step S111) The control system 13 determines whether the batteries of all of the electric vehicles 15, 15, ... are fully charged or not. If the batteries of all of the electric vehicles 15, 15, ... are not fully charged (step S111: No), the control system 13 proceeds to step S111, and if the batteries of all of the electric vehicles 15, 15, ... are fully charged (step S111: Yes), the control system 13 ends the processing.

[0039] (Step S112) The control system 13 removes the fully charged electric vehicles 15, 15, ... from the charging processing targets, and returns the process to step S104. In step S104, the control system 13 removes the fully charged electric vehicles 15, 15, ... from the charging processing targets, determines the priority order, and continues the charging process of the electric vehicles 15, 15, ... to be charged.

[0040] As described above, in the embodiment of the present invention, the control system 13 charges the electric vehicles 15, 15, ... connected to the multiple outlets 14, 14, ... in rotation according to priority. Because charging is performed in rotation, a large amount of power is not required as in the case of simultaneous charging. Therefore, there is no need to replace the substation equipment 11 with a large-scale facility, and there is also no need to change the contracted power to a higher power, which reduces operating costs. Furthermore, there are times during the night when the amount of power used in the common areas is low. During such times, the number of magnet switches 203 that are turned on can be increased according to the reduced amount of power used in the common areas.

[0041] Furthermore, in the embodiment of the present invention, the user can register information on the remaining battery charge, thereby making it possible to determine the charge amount until full charge. Also, the current transformer (CT) 202 can measure the charging current to the battery of the electric vehicle 15. This allows the control system 13 to determine whether or not full charge has been reached by comparing the determined charge amount until full charge with the charge amount determined from the measured value of the charging current and the current flow time. Also, since the charging current becomes nearly 0 when full charge is reached, the control system 13 can determine whether or not full charge has been reached based on the measurement result of the current transformer 202.

[0042] In addition, in the embodiment of the present invention, for example, a cloud BEMS is used as the control system 13. This allows users to configure charging settings using their own terminal devices 17, 17, .... In addition, since the cloud BEMS can be easily introduced, in the embodiment of the present invention, charging equipment for electric vehicles can be easily introduced into existing parking lots. Moreover, input of various data to be transmitted by the terminal device 17 to the control system 13 may be realized by executing an app (application software). Moreover, the terminal device 17 may access a web screen of a cloud BEMS that can access the control system 13 and input various data on the web screen, instead of using an app. In this case, it is possible to avoid problems that depend on app updates and smartphone models when using the device for a long period of time.

[0043] Furthermore, the power supply system according to the present invention can be used in any parking lot, not just large parking lots in tower apartment buildings, etc. Also, since there is no need to introduce large-scale equipment, it can be easily implemented in flat parking lots other than mechanical parking lots.

[0044] The power supply system 1 in the above-described embodiment may be realized in whole or in part by a computer. In that case, a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read into a computer system and executed to realize the function. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. The term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into a computer system. The term "computer-readable recording medium" may also include a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or client in that case. The above-described program may be a program for realizing a part of the above-described function, or may be a program that can realize the above-described function in combination with a program already recorded in the computer system, or may be a program that is realized using a programmable logic device such as an FPGA.

[0045] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included. [Explanation of symbols]

[0046] Reference Signs List 11... power receiving and transforming equipment, 12... distribution board, 13... control system, 14... outlet, 15... electric vehicle, 17... terminal device, 501... first acquisition unit, 502... charging control unit, 503... terminal device

Claims

1. A power supply system that supplies power obtained from a commercial power supply system to a load in a facility and at least one of a plurality of electric vehicles to charge the electric vehicle, a first acquisition unit that acquires charging request information including a remaining battery charge of the electric vehicle from a terminal device in response to an operation input from a user; a charging control unit that controls charging of the electric vehicle for which charging is requested in accordance with the acquired charging request information, based on a difference between a specified value of power to be supplied to the facility and power usage of a load in the facility; A power supply system having the following features:

2. The power supply system according to claim 1 , wherein the charging control unit supplies power to a plurality of electric vehicles in rotation.

3. 3. The power supply system according to claim 1, wherein the power consumption of the load in the facility is calculated by prediction based on a demand value.

4. The charging request information includes a charging period target, 4. The power supply system according to claim 1, wherein the charging control unit sets a priority of the electric vehicles to be charged in accordance with the target charging period.

5. a second acquisition unit that acquires a measurement value that measures a current supplied to the electric vehicle; a determination unit that determines whether or not to terminate charging based on the acquired current measurement value, a current-flow time, and the remaining battery capacity; The charging control unit is When it is determined that the charging is to be terminated, the supply of power to the electric vehicle to be terminated is stopped. The power supply system according to any one of claims 1 to 4.

6. A power supply method for supplying power obtained from a commercial power supply system to a load in a facility and at least one of a plurality of electric vehicles to charge the electric vehicle, comprising: acquiring charging request information including a remaining battery charge of the electric vehicle from a terminal device in response to an operation input from a user; controlling charging of the electric vehicle for which charging is requested in accordance with the acquired charging request information based on a difference between a specified value of power to be supplied to the facility and power usage of a load in the facility; A power supply method comprising the steps of:

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