JP2015091172A - Regional energy management system and vehicle charging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a regional energy management system and a vehicle charging system, enabling an appropriate start of charging a new vehicle in consideration of power price.SOLUTION: A regional energy management system 10 includes a center 20 and a vehicle charging system 30. The vehicle charging system 30 includes power station equipment 40, 41, 42, 43 and a controller 50. The controller 50 schedules suppression power to suppress electric power charge to a constant, using prediction information of power price from the center 20. Based on the scheduled suppression power, the controller 50 determines whether or not charging of a new vehicle of a charge target is to be started, taking into consideration power required for completing the charge of the new vehicle of the charge target.

Description

  The present invention relates to a regional energy management system and a vehicle charging system.

  In the charge control device corresponding to a plurality of ordinary chargers disclosed in Patent Document 1, the total of the individual current values of single-phase alternating current supplied to the attached charger in one unit charging operation for the storage battery and the upper limit current value, In this comparison, whether to charge or not (single-phase AC supply / non-supply) is determined.

JP 2013-118759 A

By the way, the local energy management system and vehicle charging system which charge a vehicle in consideration of electric power price are desired.
An object of the present invention is to provide a regional energy management system and a vehicle charging system that can appropriately start charging a new vehicle in consideration of the power price.

  A regional energy management system that solves the above problems includes a regional management device that transmits prediction information of power prices, and a vehicle charging system that charges a power storage unit of a vehicle with a commercial power source. A plurality of power stands connected to a power source and capable of communicating with a vehicle to be charged; and a power control device capable of communicating with the regional management device and capable of communicating with the power stand. Scheduling means for scheduling restrained power for keeping the power rate constant based on the electricity price prediction information from the regional management device, and charging of a new vehicle to be charged based on the restrained power scheduled by the scheduling means Whether or not charging of a new vehicle to be charged can be started in consideration of power to completion And summarized in that has a new vehicle charging start quality determining means for constant, the.

  According to this, in the scheduling means, the suppressed power for keeping the power rate constant is scheduled based on the prediction information of the power price from the regional management device. Whether or not the new vehicle charging start pass / fail judgment means can start charging the new charging target vehicle in consideration of the power up to the completion of charging of the new charging target vehicle based on the suppressed power scheduled by the scheduling means. Determined. Therefore, charging of a new vehicle can be appropriately started in consideration of the power price.

The gist of the above-mentioned regional energy management system is that a switch is provided on a power line to the power storage unit of the vehicle.
According to this, deterioration of the switch provided in the power line to the power storage unit of the vehicle can be suppressed.

  A vehicle charging system that solves the above problem is connected to a commercial power source, and when charging a charging unit of the vehicle to be charged with the commercial power source, a plurality of power stands that can communicate with the vehicle to be charged, and communicates with the power station A power control apparatus capable of scheduling, and a scheduling unit that schedules suppressed power for communicating with a regional management apparatus to suppress a power rate to be constant based on power price prediction information; and the scheduling unit New vehicle charging start pass / fail judgment means for judging whether or not charging of a new charging target vehicle may be started in consideration of power until completion of charging of the new charging target vehicle based on the suppressed power scheduled by It is summarized as having.

  According to this, in the scheduling means, the control power for controlling the power rate to be constant is scheduled based on the power price prediction information by communicating with the regional management device. Whether or not the new vehicle charging start pass / fail judgment means can start charging the new charging target vehicle in consideration of the power up to the completion of charging of the new charging target vehicle based on the suppressed power scheduled by the scheduling means. Determined. Therefore, charging of a new vehicle can be appropriately started in consideration of the power price.

The gist of the vehicle charging system is that a switch is provided on a power line to the power storage unit of the vehicle.
According to this, deterioration of the switch provided in the power line to the power storage unit of the vehicle can be suppressed.

  According to the present invention, it is possible to appropriately start charging a new vehicle in consideration of the power price.

The block diagram which shows a local energy management system. The flowchart which shows operation | movement of a local energy management system. Explanatory drawing which shows the vehicle during charge, a charge stop vehicle, and a charge completion vehicle. (A) is a figure which shows the change of RTP, (b) is a figure which shows the change of suppression electric power. Explanatory drawing which shows the vehicle in charge for a comparison, a charge stop vehicle, and a charge completion vehicle.

Hereinafter, an embodiment in which a regional energy management system and a vehicle charging system are embodied will be described with reference to the drawings.
As shown in FIG. 1, the regional energy management system 10 includes a center 20 as a regional management device and a vehicle charging system 30 for charging a power storage unit 65 of the vehicle with a commercial power source 25. The vehicle charging system 30 includes a plurality of power supply stands 40, 41, 42, 43 and a controller 50 as a power control device. Vehicles 60, 61, 62, and 63 are electric vehicles. The power stands 40, 41, 42, 43 are connected to the vehicles 60, 61, 62, 63 by a cable 47 to charge the power storage unit 65. The cable 47 has a power line Lp and a signal line Ls.

  The center 20 transmits power price prediction information. Specifically, RTP (Real Time Pricing), CPP (Critical Peak Pricing), and the like can be cited as prediction information of power prices. RTP is information in which prediction information is sent in units of 12 hours or 24 hours, for example, according to past results and weather.

  The controller 50 is connected to the center 20 via a communication line, and the controller 50 can communicate with the center 20. The controller 50 is notified of power price prediction information from the center 20 via the Internet line or the like.

  Each power supply stand 40, 41, 42, 43 is connected to a commercial power supply 25. A relay switch 45 is provided on the power line Lp in each power supply stand 40, 41, 42, 43. Each power supply stand 40, 41, 42, 43 includes a microcomputer 46, and the microcomputer 46 can open and close the relay switch 45.

  A power storage unit 65 is mounted on each of the vehicles 60, 61, 62 and 63. A secondary battery, an electrochemical capacitor, or the like is used as the power storage unit 65. Each vehicle 60, 61, 62, 63 has a relay switch 66, a power converter 67, and a microcomputer 68. A power storage unit 65 is connected to the power converter 67. The microcomputer 68 can open and close the relay switch 66.

  The power stands 40, 41, 42, 43 and the vehicles 60, 61, 62, 63 are connected via the power line Lp and the signal line Ls of the cable 47, and the power stands 40, 41, 42, 43 are connected to the vehicles 60, 61. , 62, 63 and the power supply stands 40, 41, 42, 43 can communicate with the vehicles 60, 61, 62, 63 to be charged.

  Specifically, in the power supply stand 40, the commercial power supply 25 is connected to the power converter 67 via the power switch Lp via the relay switch 45 and the relay switch 66, and the power converter 67 converts alternating current into direct current to Can be charged. Further, the microcomputer 46 of the power stand 40 and the microcomputer 68 of the vehicle 60 can communicate with each other through the signal line Ls.

  Similarly, in the power supply stand 41, the commercial power supply 25 is connected to the power converter 67 via the relay switch 45 and the relay switch 66 by the power line Lp, and the alternating current is converted to direct current in the power converter 67 to store the power storage unit 65. Can be charged. Further, the microcomputer 46 of the power supply stand 41 and the microcomputer 68 of the vehicle 61 can communicate with each other through the signal line Ls. In the power supply stand 42, the commercial power supply 25 is connected to the power converter 67 via the power line Lp via the relay switch 45 and the relay switch 66, and alternating current is converted to direct current in the power converter 67 to charge the power storage unit 65. Can do. Further, the microcomputer 46 of the power stand 42 and the microcomputer 68 of the vehicle 62 can communicate with each other through the signal line Ls. In power supply stand 43, commercial power supply 25 is connected to power converter 67 via relay switch 45 and relay switch 66 by power line Lp, and AC is converted to DC in power converter 67 to charge power storage unit 65. Can do. Further, the microcomputer 46 of the power stand 43 and the microcomputer 68 of the vehicle 63 can communicate with each other through the signal line Ls.

  When the power stand 40, 41, 42, 43 and the vehicle 60, 61, 62, 63 are connected by the cable 47 and the power storage unit 65 of the vehicle is charged by the commercial power supply 25, the power stand 40, 41, 42, 43 and the vehicle Mutual communication is performed between 60, 61, 62, and 63, and charging becomes possible when charging permission is given.

When charging is stopped, both the relay switch 45 on the power supply stand side and the relay switch 66 on the vehicle side are turned off for safety.
Each vehicle (power storage unit 65, power converter 67, microcomputer 68) can variably control the charging current during charging. The variable control of the charging current is performed when the charging current is a predetermined value (for example, 6 amperes) or more. In other words, the current value can be controlled during charging, but charging is not possible when the charging current is less than 6 amperes.

  The controller 50 is connected to the microcomputer 46 of each power supply stand 40, 41, 42, 43. The controller 50 can communicate with the power supply stand 40, 41, 42, 43.

  The controller 50 controls the microcomputer 46 of the power supply stand and the microcomputer 68 of the vehicle. Thereby, at the start of charging, the relay switch 45 is closed by the microcomputer 46 and the relay switch 66 is closed by the microcomputer 68 to start power conversion in the power converter 67. When the charging is finished, the microcomputer 68 stops the power conversion in the power converter 67. When the charging is finished, the microcomputer 68 opens the relay switch 66 and the microcomputer 46 opens the relay switch 45.

Next, the operation will be described.
The flow of FIG. 2 is executed, whereby the vehicle is charged in the power supply stands 40, 41, 42, and 43 as shown in FIG. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the amount of charge (charging current). That is, at a constant voltage (for example, 200 volts), the charging power changes when the charging current changes. In addition, the vertical axis in FIG. 3 shows a vehicle being charged, a vehicle for which charging permission is not given (charging is not started), and a vehicle for which charging has been completed.

  For example, in the state (timing) of t1, vehicles A, B, and C are charging at a power supply stand. At this time, vehicle A is charged at 10 amperes, vehicle B is charged at 10 amperes, and vehicle C is charged at 10 amperes. Moreover, in the state (timing) of t1, the condition where the new charge object vehicle D has arrived is shown. At this time, the vehicle D is not immediately charged and is in a waiting state for charging.

  On the other hand, in the state (timing) at t5, the vehicles A, B, C, and D are charged at 8 amperes at the power supply stand, indicating that the vehicle A is separated from the power supply stand when charging is completed.

  In step 100 of FIG. 2, a charging request is input to the controller 50 from a new charging target vehicle via the microcomputer 46 of the power supply stand. Then, in step 101, the controller 50 receives the time received from the center 20 so as to manage the power so as not to exceed the contract power because the basic charge becomes high if the contract power exceeds the contract power at a place where a plurality of units are charged. Suppressed power that suppresses the power rate to a certain level is determined from each RTP information. That is, the controller 50 schedules the suppressed power for keeping the power rate constant based on the prediction information of the power price from the center 20.

  The relationship between RTP and suppression power will be described with reference to FIGS. 4 (a) and 4 (b). As shown in FIGS. 4A and 4B, when RTP increases, the suppression power (suppression current value) decreases, and when RTP decreases, the suppression power (suppression current value) increases. . As a result, when the power price is likely to increase, it is possible to suppress the suppressed power (suppressed current value) and to make the power charge constant.

  In the state (timing) of t1, the suppression power (suppression current value) L1 in FIG. 3 is 32 amperes, vehicle A is 10 amperes, vehicle B is 10 amperes, and vehicle C is 10 amperes. Can be charged.

  In step 102 of FIG. 2, the controller 50 checks the suppression power until the estimated charging completion time of the new charging target vehicle D, executes the processes of steps 103 to 107, and makes a charging plan based on the power price prediction information. . That is, based on the scheduled suppression power, it is determined whether or not the charging of the new charging target vehicle D can be started in consideration of the power until the charging of the new charging target vehicle D is completed. To start. In step 109, the system waits until charging can be started if necessary.

  Note that the charging time (maximum charging time) may be determined, for example, by detecting the capacity and the charging rate (SOC) of the power storage unit 65 of the vehicle through communication with the microcomputer 68 of the vehicle. Good. In addition, the charging time may be determined or the charging time may be input by performing an input operation of the vehicle type by a user key input operation at the power stand. Or you may set fixed time uniformly as charging time.

  First, the controller 50 estimates how many of these precharges can be performed from the predicted suppression power, and determines whether or not a new charging target vehicle can participate in charging in step 103 of FIG. If the new charging target vehicle can participate in charging, the controller 50 grants charging permission to the microcomputer 46 of the power supply stand in step 108 to participate in charging.

  On the other hand, if the new charging target vehicle cannot participate in charging in step 103, the controller 50 determines whether the new charging target vehicle can participate in charging by reducing the charging current of the new charging target vehicle in steps 104 and 105. . If controller 50 still determines that the new charging target vehicle cannot participate in charging, it determines whether or not the new charging target vehicle can participate in charging in steps 106 and 107 by reducing the charging current of the other vehicles. If the new charge target vehicle still cannot participate in charging, the controller 50 waits at step 109.

  In step 104, the controller 50 determines whether the charge amount (charge current) of the new vehicle to be charged can be suppressed to a minimum. That is, it is determined whether or not a minimum value (for example, 6 amps) can be secured when the charging current of the new charging target vehicle is lowered.

  When the charge amount (charge current) of the new charge target vehicle is minimum (can be suppressed), the controller 50 determines in step 105 whether the new charge target vehicle can participate in charging. When the new vehicle to be charged can participate in charging, the controller 50 grants charging permission to the microcomputer 46 of the power supply stand in step 108 to participate in charging.

  On the other hand, if the charge amount (charge current) of the new charge target vehicle is not minimum (cannot be suppressed) in step 104, or if the new charge target vehicle cannot participate in charging in step 105, the controller 50 determines that It is determined whether the charge amount (charge current) of the vehicle can be suppressed at a minimum. That is, it is determined whether or not a minimum value (for example, 6 amperes) can be secured when the charging current of another vehicle is lowered. If the charge amount (charge current) of the other vehicle is minimum (can be suppressed), it is determined in step 107 whether the new vehicle to be charged can participate in charging. If the new charging target vehicle can participate in charging, the controller 50 grants charging permission to the microcomputer 46 of the power supply stand in step 108 to participate in charging.

  Further, when the charge amount (charge current) of the other vehicle is not minimum (cannot be suppressed) in step 106, or the new charge target vehicle cannot participate in charging in step 107, the controller 50 reduces the suppression in step 109. Wait until

  FIG. 5 is a diagram for comparison. In FIG. 5, charging is not planned and charging of the vehicle D is interrupted. Since charging is known to be interrupted when charging is started, charging is waited (waiting) until the charging can be completed without interruption. Thereby, durability is improved without opening and closing the relay switches 45 and 66.

These processes will be described by comparing FIG. 3 and FIG.
In FIG. 3, the suppression power (suppression current value) L1 is 32 amperes in the t1 and t2 states (timing), 21 amperes in the t3 state (timing), 25 amperes in the t4 state (timing), and the t5 state (timing). ) Is 32 amperes, t6 and t7 are 25 amperes (timing), and t8 is state (timing) 16 amperes.

And even if the vehicle D arrives in the state (timing) of t1, charging is not started until the state (timing) of t5.
That is, even if the vehicle D arrives in the state (timing) at t1, charging is not started immediately, and the vehicles A, B, and C are charged at 10 amperes respectively at the state (timing) t2, and t3 and t4 In the state (timing), the vehicles A, B, and C are charged at 7 amperes each. Charging of the vehicle D is started at the state (timing) of t5, the vehicles A, B, C, and D are charged at 8 amperes at the state (timing) of t5, respectively. C and D are charged at 8 amperes each, and in the state (timing) at t8, the vehicles C and D are charged at 6 amperes each.

  In FIG. 5 as a comparative example, a charging plan based on RTP is not made as in the present embodiment. Therefore, when the vehicle D arrives at the state (timing) at t1, the charging is immediately performed at the state (timing) at t2. To start. Then, charging of the vehicle D is stopped in the state (timing) at t3. At this time, the relay switches 45 and 66 are turned off (opened). Thereafter, the relay switches 45 and 66 are closed at t5 (timing) to restart charging. On the other hand, in the present embodiment of FIG. 3, it is determined that continuous charging is possible until the completion of charging based on the suppressed power (suppressed current value) calculated from RTP and the predicted charging value of the new vehicle to be charged (state t5 ( By starting charging at the timing), the relay switches 45 and 66 are not opened or closed during charging without interruption.

This will be described in more detail.
When charging an electric vehicle within the range of contracted power, considering the RTP that determines the power price every predetermined time, charging the vehicle at a time when the power price is low by suppressing charging to the vehicle when the power price is high, etc. A system that links RTP and charging start time is required. For example, it is necessary to perform power management so that the contracted power is not exceeded in a place where a plurality of charging is performed such as a public parking lot or a parking lot of a business office. And if some of the vehicles are already charging, if new vehicles participate in charging, when these vehicles are charging, RTP becomes higher after starting charging, or CPP (emergency peak charge) is halfway When activated, charging to the vehicle must be stopped even during charging because the power charge per hour is high. Then, there is a concern about deterioration of durability of the relay switch 66 of the vehicle. Specifically, as shown in FIG. 5, the vehicles A, B, and C are charged in the state of t1, but the vehicle D cannot be charged due to a decrease in power that can be used for charging in the state t3. The charging of D is stopped halfway, and the relay switch 66 on the vehicle side is turned off (opened). At this time, when the relay switch 66 or the like is turned off (opened), the contact is deteriorated by arc discharge, and it is necessary to close the relay switch 66 or the like by resuming the charging at the subsequent state t5. It tends to cause deterioration due to the increase.

  On the other hand, in FIG. 3, communication with the vehicle via the power supply stand and communication with the center (regional management device) 20 are performed, and the suppression power (suppression current value) L1 is calculated from the information from the center 20, and new charging is performed. The start of charging of the new charging target vehicle is determined in consideration of the power until the charging of the target vehicle is completed.

  As a result, in order to limit the power according to RTP without stopping the charging of the vehicle that causes deterioration of the relay switch etc. of the vehicle, it is possible to charge without stopping the charging until the charging is completed with the suppression power calculated from RTP Do not start charging until Therefore, durability is improved because it is not necessary to move the vehicle relay switch and the like wastefully.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) As a process when a new vehicle to be charged arrives at one of the power stands, the supply of power price prediction information is received and the current charging is performed. If it is impossible to continuously charge the battery, the charging is started after waiting until the charging can be completed without charging. Thereby, interruption of charging can be avoided.

  (2) Specifically, the local energy management system 10 includes a center 20 for transmitting power price prediction information such as RTP, and a vehicle charging system 30 for charging the power storage unit 65 of the vehicle with the commercial power supply 25. . The vehicle charging system 30 is connected to a commercial power source 25 and can communicate with a vehicle to be charged. The vehicle charging system 30 can communicate with the center 20 and the power station 40, 41, 42. , 43 can be communicated with a controller 50. The controller 50 has a function (scheduling means) that schedules the suppressed power for suppressing the power rate to be constant based on the power price prediction information from the center 20. In addition, the controller 50 determines whether or not the charging of the new charging target vehicle D may be started in consideration of the power until the charging of the new charging target vehicle D is completed based on the scheduled suppression power ( New vehicle charging start pass / fail judgment means). Therefore, charging of a new vehicle can be appropriately started in consideration of the power price.

  (3) The vehicle charging system 30 is connected to the commercial power supply 25 and has a plurality of power stands 40, 41, 42, 43 that can communicate with the charging target vehicle when charging the charging unit of the charging target vehicle with the commercial power supply. And a controller 50 capable of communicating with the power stands 40, 41, 42, 43. The controller 50 has a function (scheduling means) that communicates with the center 20 and schedules the restrained power for keeping the power rate constant based on the power price prediction information. The controller 50 determines whether or not the charging of the new charging target vehicle D may be started in consideration of the power until the charging of the new charging target vehicle D is completed based on the scheduled suppression power (new vehicle). Charging start pass / fail judgment means). Therefore, charging of a new vehicle can be appropriately started in consideration of the power price.

  (4) In the above (2) and (3), the number of actuations of the relay switches 45, 66 provided on the power line to the power storage unit 65 of the vehicle can be reduced to suppress the deterioration of the relay switches 45, 66.

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the embodiment, the number of power stands is “4”, but the number is not limited.
In the embodiment, the power stand and the vehicle are connected with a cable, but the power stand and the vehicle may be connected in a non-contact manner. In the non-contact method, the coil attached to the vehicle and the ground-side coil are separated from each other, and power is transmitted between the coils by resonance, electromagnetic induction, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Regional energy management system, 20 ... Center, 30 ... Vehicle charging system, 40 ... Power supply stand, 41 ... Power supply stand, 42 ... Power supply stand, 43 ... Power supply stand, 50 ... Controller, 60 ... Vehicle, 61 ... Vehicle, 62 ... Vehicle, 63 ... Vehicle, 65 ... Power storage unit.

Claims (4)

A regional management device that transmits power price forecast information;
A vehicle charging system for charging a power storage unit of a vehicle with a commercial power source,
The vehicle charging system includes:
A plurality of power stands connected to the commercial power source and communicable with a vehicle to be charged; and a power control device capable of communicating with the regional management device and communicable with the power stand.
The power control device is a scheduling unit that schedules suppressed power for keeping the power rate constant according to the prediction information of the power price from the area management device;
A new vehicle charging start pass / fail determination that determines whether or not charging of a new charging target vehicle can be started in consideration of power until completion of charging of the new charging target vehicle based on the suppressed power scheduled by the scheduling means. Means,
A regional energy management system characterized by comprising:   The local energy management system according to claim 1, wherein a switch is provided on a power line to the power storage unit of the vehicle. A plurality of power stands connected to a commercial power source and capable of communicating with the charging target vehicle when charging the charging unit of the charging target vehicle with the commercial power source;
A power control device capable of communicating with the power stand;
With
The power control device
Scheduling means that communicates with the regional management device and schedules restrained power for keeping the power rate constant based on the prediction information of the power price;
A new vehicle charging start pass / fail determination that determines whether or not charging of a new charging target vehicle can be started in consideration of power until completion of charging of the new charging target vehicle based on the suppressed power scheduled by the scheduling means. Means,
A vehicle charging system characterized by comprising:   The vehicle charging system according to claim 3, wherein a switch is provided on a power line to the power storage unit of the vehicle.