JP2021044972A - Energy management system, charging system and charge/discharge management method - Google Patents

Abstract

To obtain an energy management system which can generate a more appropriate charging schedule than ever before.SOLUTION: An EMS 30 is provided that generates a system charge/discharge plan including a charge plan of chargers 10-1 to 10-n which can charge a storage battery provided on a vehicle and a charge/discharge plan of a storage battery which can store power generated by a photovoltaic facility and can supply discharged power to the chargers 10-1 to 10-n. The EMS 30 comprises: a plan generation unit 302 which predicts the power generation amount of the photovoltaic facility based on information indicative of weather forecast, and generates the system charge/discharge plan based on the predicted value of the power generation amount and the operation schedule of the vehicle; and a plan update unit 304 which updates the system charge/discharge plan based on information indicative of updated weather forecast.SELECTED DRAWING: Figure 2

Description

The present invention relates to an energy management system, a charging system, and a charge / discharge management method for controlling the charging of a plurality of mobile bodies having a storage battery.

In recent years, electric vehicles have become widespread. In the future, it is expected that full-scale electric vehicles will be used for commercial vehicles such as buses and trucks. Furthermore, it is expected that not only automobiles but also all moving objects such as trains, airplanes, and ships will be equipped with storage batteries and use electricity as energy.

When a mobile body for business use is equipped with a storage battery, the business operator needs to determine the charging schedule in consideration of electricity charges and the like because the storage battery of a large number of mobile bodies will be charged. Patent Document 1 discloses a charging system that uses the cost borne by the business operator, the presence or absence of excess of contracted power, and the like as evaluation functions, and creates a charging schedule so that the contracted power evaluation function becomes suitable.

Japanese Unexamined Patent Publication No. 2016-226091

However, according to the technique described in the above-mentioned conventional patent document 1, the charging schedule is determined based on the information predicted at the time of creating the plan such as the operation plan, and the latest forecast information that changes from moment to moment. Is not taken into account. For this reason, there is a problem that the charging schedule may be inappropriate, which may cause a situation such as an excess of contract power or a shortage of the charge amount of the storage battery of the mobile body.

The present invention has been made in view of the above, and an object of the present invention is to obtain an energy management system capable of creating a more appropriate charging schedule as compared with the conventional one.

In order to solve the above-mentioned problems and achieve the object, the energy management system according to the present invention generates electricity by a charging plan of a plurality of chargers capable of charging a mobile storage battery and a photovoltaic power generation facility. It is an energy management system that creates a system charge / discharge plan that includes a charge / discharge plan for a storage battery that can store the stored power and supply the discharged power to the charger. This energy management system predicts the amount of power generated by the photovoltaic power generation facility based on the information indicating the weather forecast, and creates a system charge / discharge plan based on the predicted value of the amount of power generated and the operation plan of the moving object. It includes a creation unit and a plan update unit that updates the system charge / discharge plan based on the updated information indicating the weather forecast.

According to the present invention, there is an effect that a more appropriate charging schedule can be created as compared with the conventional case.

The figure which shows the configuration example of the charging system which concerns on Embodiment 1. The figure which shows the functional structure example of the EMS of Embodiment 1. The figure which shows the configuration example of the computer system which realizes the EMS of Embodiment 1. The figure which shows an example of the system charge / discharge plan created by the plan making part of Embodiment 1. A flowchart showing an example of a system charge / discharge plan creation procedure in the EMS of the first embodiment. The figure which shows an example of the operation plan stored in the storage part of Embodiment 1. The figure which shows an example of the charge schedule of Embodiment 1. The figure which shows an example of the charge amount management data used for the calculation of the required charge amount of Embodiment 1. The figure which shows an example of the charging power of each charger in Embodiment 1. The figure which shows an example of the power generation amount of the solar power generation facility of Embodiment 1. A flowchart showing an example of the update processing procedure of the system charge / discharge plan in the EMS of the first embodiment. The figure which shows the configuration example of the charging system of Embodiment 2. A flowchart showing an example of an autonomous voltage control operation in the storage battery PCS of the second embodiment. The figure which shows the configuration example of the charging system of Embodiment 3. The figure which shows the functional structure example of the EMS of Embodiment 3. The figure which shows an example of the charging schedule of the charger of Embodiment 3. A flowchart showing an example of the switching control process of the third embodiment.

Hereinafter, the energy management system, the charging system, and the charge / discharge management method according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a charging system according to a first embodiment of the present invention. As shown in FIG. 1, the charging system 1 of the present embodiment is a system capable of charging vehicles 5-1 to 5n, which is an example of a mobile body having a storage battery for the mobile body. n is an integer of 2 or more. Hereinafter, when the vehicles 5-1 to 5-n are not individually distinguished, the vehicle 5 is also described. Hereinafter, an example in which the vehicle 5 is a bus will be described, but the vehicle 5 is not limited to a bus, and may be a truck traveling on a generally specified route, an ordinary automobile for business use, or the like. Further, in the following description, the vehicle 5 will be described as an example of a moving body that moves by using electric energy, but the charging system 1 of the present embodiment charges other moving bodies such as a train, an airplane, and a ship. It is also applicable to. Further, the moving body is not limited to the one that moves only by electric energy, and may move by using both electric energy and other energy sources such as gasoline in combination. A mobile body that moves using electric energy generally has a storage battery for the mobile body, and moves using the electric power stored in the storage battery.

The vehicle 5 includes a storage battery which is a storage battery for a mobile body, and travels by using the electric power stored in the storage battery. The charging system 1 of the present embodiment is installed in a parking lot of the vehicle 5, a business establishment of the business operator managing the vehicle 5, a station of the vehicle 5, and the storage battery mounted on the vehicle 5 managed by the business operator. It is a charging system. Each vehicle 5 operates according to the operation plan, and when the day's operation is completed, the vehicle 5 returns to the parking lot, business establishment, station, etc. where the charging system 1 is installed, and is charged by the charging system 1. As shown in FIG. 1, the charging system 1 includes an energy management system (hereinafter abbreviated as EMS) 30, a charger 10-1 to 10-n, a connection unit 11-1 to 11-n, a storage battery 20, and a storage battery power conditioner. It is provided with (hereinafter abbreviated as PCS) 21, a photovoltaic power generation facility 22, and a power generation amount measuring device 23. Hereinafter, when the chargers 10-1 to 10-n and the connection units 11-1 to 11-n are not individually distinguished, they are also described as the charger 10 and the connection unit 11, respectively.

Three-phase AC power is supplied to the charging system 1 from the power system 2 managed by the power company via the transformer 3. The transformer 3 converts the voltage of the three-phase AC power supplied from the power system 2 into a voltage that can be used in the charging system 1 and outputs the voltage to the power system 4 in the facility. A premises load 6 that uses three-phase AC power is connected to the facility power system 4. Although the example in which the premises load 6 is connected to the facility power system 4 is shown here, the premises load 6 may not be connected to the facility power system 4. The electric power system 2 managed by the electric power company is also simply referred to as a system below. Although the vehicle 5 and the transformer 3 are also shown in the charging system 1 in FIG. 1, the vehicle 5 and the transformer 3 do not mainly constitute the charging system 1 but are connected to or connected to the charging system 1. It is possible. The charging system 1 may be defined as including the vehicle 5 and the transformer 3.

The chargers 10-1 to 10-n are a plurality of chargers capable of charging vehicles 5-1 to 5-n, which is an example of a plurality of mobile bodies. The charger 10-1 to 10-n has an AC / DC (Alternating Current / Direct Current) conversion function, which is a function of converting three-phase AC power into DC power. The chargers 10-1 to 10-n transfer the three-phase AC power supplied from the facility power system 4 to the DC of the voltage value specified by the vehicle 5 via the corresponding connection units 11-1 to 11-n. Convert to electric power. The voltage value specified by the vehicle 5 is included in the information notified from the vehicle 5 by the chargers 10-1 to 10-n via the connection units 11-1 to 11-n, as will be described later. The chargers 10-1 to 10-n supply the converted DC power to the vehicle 5 at the power value specified by the EMS 30 via the corresponding connection units 11-1 to 11-n. The storage battery of the vehicle 5 can be charged. Note that FIG. 1 shows an example in which vehicles 5-1 to 5-n are connected to the chargers 10-1 to 10-n, respectively, but the number of vehicles 5 managed by the business operator is generally charged. More than the number of vessels 10. The number of vehicles 5 is not particularly limited, and may be the same as or different from the number of chargers 10.

The connection units 11-1 to 11-n are also called charging stands, and have a joining cable for connecting to the vehicle 5 when charging the vehicle 5. The junction cable has a function as a power supply line for transmitting electric power and a function as a communication line for performing communication. The connection unit 11-11-11-n can communicate with the vehicle 5 via a joining cable. The connection units 11-1 to 11-n acquire information on the storage battery of the connected vehicle 5 from the vehicle 5 by the communication. The information about the storage battery mounted on the vehicle 5 is charging on / off information for determining the start and end of charging, the voltage value specified when charging the storage battery, and the remaining amount information indicating the remaining amount of the storage battery. It includes SOC (State Of Charge), which is also called the charge rate. The charger 10-1 to 10-n transmits at least a part of the information acquired from the vehicle 5 to the EMS 30 via the connection units 11-1 to 11-n. In the present embodiment, the chargers 10-1 to 10-n notify the EMS 30 of the SOC of the storage battery acquired from the vehicle 5.

The photovoltaic power generation facility 22 can convert sunlight into electric energy and output the electric energy as DC power. The amount of power generated, which is the amount of power generated by the photovoltaic power generation facility 22, is notified to the EMS 30 via the power generation amount measuring device 23.

The storage battery 20 can store the DC power output from the photovoltaic power generation facility 22. The storage battery PCS 21 is a control device that charges and discharges the storage battery 20. The storage battery PCS 21 charges and discharges the storage battery 20 based on the charge / discharge command received from the EMS 30. The storage battery PCS 21 has a function of converting the DC power output from the storage battery 20 into three-phase AC power and supplying it to the facility power system 4 when the storage battery 20 is discharged. Further, the storage battery PCS 21 also has a function of converting the three-phase AC power supplied from the facility power system 4 into DC power and charging the storage battery 20 using this DC power. That is, the storage battery 20 can supply the electric power generated by the photovoltaic power generation facility 22 to the chargers 10-1 to 10-n by storing the electric power in itself and discharging the stored electric power. The commercial vehicle 5 is mainly operated in the daytime and is often charged at night. When a large number of vehicles 5 are charged at the same time, the electric power supplied from the electric power system 2 to the charging system 1 becomes very large, which may exceed the contracted electric power or the upper limit value requested by the electric power company. In the present embodiment, the electric power generated by the photovoltaic power generation facility 22 is stored in the storage battery 20, and the electric power stored in the storage battery 20 is used for charging at night to charge from such a power system 2. The peak value of the power supplied to the system 1 can be suppressed.

The EMS 30 can communicate with the weather forecast center 31 and the road traffic center 32 via the public line 33, respectively. The weather forecast center 31 distributes information such as a predicted value of future solar radiation, a weather forecast, and the amount of solar radiation of the day. The Road Traffic Center 32 distributes congestion prediction data, which is information indicating future road congestion prediction, current road congestion status, and the like.

The EMS 30 creates a "system charge / discharge plan" which is an overall charge / discharge plan of the charging system 1 based on the information acquired from the weather forecast center 31 and the road traffic center 32 and the operation plan of the vehicle 5. Further, the EMS 30 generates charge / discharge commands for the charger 10-1 to 10-n and the storage battery PCS21 according to the system charge / discharge plan, and charges / discharge commands to the charger 10-1 to 10-n and the storage battery PCS21. To send. The system charge / discharge plan is a charge / discharge plan for the entire charging system 1 including a charging schedule for charging the vehicle 5, a charging / discharging schedule for the storage battery 20, and the like. Further, the EMS 30 changes the system charge / discharge plan when it determines that it is necessary to change the system charge / discharge plan based on the latest status data acquired from the weather forecast center 31 and the road traffic center 32. The details of the operation of the EMS 30 will be described later.

Here, an example in which all the vehicles 5 are charged by one charging system 1 when the operation of one day is completed will be described, but the places for charging the vehicles may be divided into several places. When the charging locations for charging the vehicle are divided into a plurality of charging locations, the charging system 1 may be installed for each charging location, or one EMS 30 may manage the plurality of charging locations. In the latter case, a plurality of sets of chargers 10 and connection units 11 are provided at each charging location, and the EMS 30 creates a charging schedule for the chargers 10 and connection units 11 at all charging locations. The storage battery 20, the storage battery PCS21, the photovoltaic power generation facility 22, and the power generation amount measuring instrument 23 may be provided for each charging location, or these facilities may be provided in a part of the charging locations.

FIG. 2 is a diagram showing a functional configuration example of the EMS 30 of the present embodiment. As shown in FIG. 2, the EMS 30 includes a communication unit 301, a plan creation unit 302, an update determination unit 303, a plan update unit 304, a command generation unit 305, and a storage unit 306.

The communication unit 301 communicates with each of the weather forecast center 31 and the road traffic center 32 via the public line 33. The communication unit 301 stores the solar radiation amount prediction data delivered from the weather forecast center 31 and the traffic congestion prediction data delivered from the road traffic center 32 in the storage unit 306. Further, the communication unit 301 communicates with each of the charger 10-1 to 10-n and the storage battery PCS21. In the communication unit 301, each of the chargers 10-1 to 10-n receives the SOC of the storage battery 20 acquired from the vehicle 5 via the connection units 11-1 to 11-n, and the chargers 10-1 to 10-n. When it is received from, it is stored in the storage unit 306 as SOC data. The communication performed by the communication unit 301 may be wired communication or wireless communication. The communication via the public line 33 and the communication in the charging system 1 may be different communication methods. In this case, the EMS 30 is charged with the communication unit for communication using the public line 33. A communication unit for communication between the charger 10-1 to 10-n and the storage battery PCS21 may be individually provided. For example, communication via the public line 33 may be wired communication, and communication in the charging system 1 may be wireless communication.

The storage unit 306 stores data distributed from the weather forecast center 31 and the road traffic center 32, information input by the user, information temporarily generated in the process of processing, the result of processing, and the like. Specifically, as shown in FIG. 2, the solar radiation amount prediction data, the congestion prediction data, the electricity charge data, the operation plan, the SOC data, and the system charge / discharge plan are stored. The electricity rate data and the operation plan may be received by the EMS 30 from another device via the communication unit 301, or may be input by the user. Details of the method for creating the system charge / discharge plan will be described later. Note that FIG. 2 shows the main data stored in the storage unit 306, and in addition to these, information temporarily generated in the process of processing, information other than these used in the processing, and the like are also stored in the storage unit 306. It is remembered, but these illustrations are omitted.

The planning unit 302 predicts the amount of power generated by the photovoltaic power generation facility 22 based on the information indicating the weather forecast, and creates a system charge / discharge plan based on the predicted value of the amount of power generation and the operation plan of the vehicle 5. .. An example of information indicating a weather forecast is solar radiation forecast data. In detail, the planning unit 302 created and created a system charge / discharge plan using the solar radiation amount prediction data, the congestion prediction data, the electricity charge data, the operation plan, the SOC data, etc. stored in the storage unit 306. The system charge / discharge plan is stored in the storage unit 306. The update determination unit 303 determines whether or not it is necessary to change the system charge / discharge plan based on the updated information acquired from the weather forecast center 31, the road traffic center 32, etc. via the communication unit 301. To do. The updated information is information that has been updated since the creation of the system charge / discharge plan, and is, for example, the latest information that can be acquired at that time.

The plan update unit 304 updates the system charge / discharge plan based on the updated weather forecast information. Specifically, when the update determination unit 303 determines that the system charge / discharge plan needs to be changed, the system charge / discharge plan stored in the storage unit 306 is reviewed. The command generation unit 305 is a charge / discharge command that is a command for charging or discharging each of the charger 10-1 to 10-n and the storage battery PCS21 based on the system charge / discharge plan stored in the storage unit 306. Is generated, and the generated charge / discharge command is transmitted to the corresponding chargers 10-1 to 10-n and the storage battery PCS21 via the communication unit 301.

Specifically, the EMS 30 is realized by a computer system. FIG. 3 is a diagram showing a configuration example of a computer system that realizes the EMS 30 of the present embodiment. As shown in FIG. 3, this computer system includes a control unit 101, an input unit 102, a storage unit 103, a display unit 104, a communication unit 105, and an output unit 106, which are connected via a system bus 107. There is.

In FIG. 3, the control unit 101 is, for example, a CPU (Central Processing Unit) or the like. The control unit 101 executes a charge management program in which the charge / discharge management method of the present embodiment is described. The input unit 102 is composed of, for example, a keyboard, a mouse, and the like, and is used by a user of a computer system to input various information. The storage unit 103 includes various memories such as RAM (Random Access Memory) and ROM (Read Only Memory) and a storage device such as a hard disk, and is a necessary program obtained in the process of a program and processing to be executed by the control unit 101. Store data etc. The storage unit 103 is also used as a temporary storage area for the program. The display unit 104 is composed of an LCD (liquid crystal display panel) or the like, and displays various screens to a user of a computer system. The communication unit 105 is a communication circuit or the like that performs communication processing. The communication unit 105 may be composed of a plurality of communication circuits corresponding to a plurality of communication methods. The output unit 106 is an output interface that outputs data to an external device such as a printer or an external storage device. Note that FIG. 3 is an example, and the configuration of the computer system is not limited to the example of FIG.

Here, an operation example of the computer system until the charge management program of the present embodiment becomes executable will be described. In the computer system having the above-described configuration, for example, a charge management program is stored from a CD-ROM drive or DVD-ROM set in a CD (Compact Disc) -ROM or DVD (Digital Versatile Disc) -ROM drive (not shown). It is installed in part 103. Then, when the charge management program is executed, the charge management program read from the storage unit 103 is stored in the storage unit 103. In this state, the control unit 101 executes the process as the EMS 30 of the present embodiment according to the program stored in the storage unit 103.

In the above description, a program describing the processing in the EMS 30 is provided using a CD-ROM or a DVD-ROM as a recording medium, but the present invention is not limited to this, and the configuration of the computer system, the capacity of the provided program, and the like are provided. Depending on the situation, for example, a program provided by a transmission medium such as the Internet via the communication unit 105 may be used.

The plan creation unit 302, the update determination unit 303, the plan update unit 304, and the command generation unit 305 shown in FIG. 2 are realized by the control unit 101 of FIG. The storage unit 306 shown in FIG. 2 is a part of the storage unit 103 shown in FIG. The communication unit 301 shown in FIG. 2 is realized by the communication unit 105 shown in FIG.

Next, the operation of this embodiment will be described. The EMS30 of the present embodiment creates a future system charge / discharge plan, specifically, for example, a system charge / discharge plan for 24 hours from 7:00 to the next day at a fixed time every day, for example, 18:00 or 19:00. Here, as a future system charge / discharge plan, the next day's 24 hours is set as the target time zone of the plan, but the length of the target time zone of the future system charge / discharge plan is not limited to one day (24 hours). It may be for multiple days, such as a day or a week. Further, the start time of the target time zone of the future system charge / discharge plan is not limited to 7 o'clock, and may be appropriately set according to the operation plan of the vehicle 5. Further, the timing for creating the future system charge / discharge plan is not limited to the time such as 18:00 or 19:00, and may be appropriately set according to the target time zone of the system charge / discharge plan. When the EMS 30 of the present embodiment further determines that the system charge / discharge plan needs to be changed based on the latest data obtained from at least one of the weather forecast center 31, the road traffic center 32, and the vehicle 5. Update the system charge / discharge plan. That is, the EMS 30 of the present embodiment has a function of dynamically updating the system charge / discharge plan. In the charge / discharge management method executed by the EMS 30 of the present embodiment, both the system charge / discharge plan creation performed at a fixed time every day and the dynamic system charge / discharge plan update regardless of the time are performed in this way. ..

Further, here, the system charge / discharge plan is created with one hour as one frame, but the time step in the system charge / discharge plan may be set to 30 minutes or the like, and the time step is not limited to one hour. ..

FIG. 4 is a diagram showing an example of a system charge / discharge plan created by the plan creation unit 302 of the present embodiment. As shown in FIG. 4, the system charge / discharge plan includes a charging schedule and charging power for each charger 10. The charging schedule is information indicating which vehicle 5 is to be charged in each time zone, that is, information indicating the allocation of charging time of the vehicle 5. Further, as shown in FIG. 4, the system charge / discharge plan also includes the charge power of each charger 10, the amount of photovoltaic power generation, the charge / discharge power of the storage battery 20, and the purchased power. The charging schedule of each charger 10 and the charging power of each charger 10 are collectively referred to as a charging plan of the charger 10. Further, a plan showing the charge / discharge power of the storage battery 20 in each time zone is also called a charge / discharge plan of the storage battery 20. As described above, the system charge / discharge plan of the present embodiment is a plan to manage the entire electric power of the charging system 1 including the power generation plan and the electric power purchase plan. Although it is not a system charge / discharge plan, FIG. 4 also shows the electricity charges for the purchased power in each time zone. The electricity charge for each time zone is determined according to the contract with the electric power company, and is stored as electricity charge data in the storage unit 306 as described above.

Further, in FIG. 4, the period for creating the system charge / discharge plan for the next day is described as the plan target for the next day. In the figures showing each of the following information including FIG. 4, in addition to the period to be planned on the next day, the period in which the system charge / discharge plan has already been created by the processing performed on the previous day is described as the update target on the day. There is. In the example shown in FIG. 4, the period to be updated on the current day is a period before 7 o'clock on the next day, and each data to be updated on the current day is updated as necessary by the update process described later.

First, the creation of a system charge / discharge plan will be described. FIG. 5 is a flowchart showing an example of the system charge / discharge plan creation procedure in the EMS 30 of the present embodiment. As shown in FIG. 5, the planning unit 302 of the EMS 30 determines the charging schedule based on the operation plan and the congestion prediction data (step S1). Here, a specific example of the method for determining the charging schedule in step S1 will be described. The traffic congestion prediction data is distributed from the Road Traffic Center 32 as described above. It is assumed that the traffic jam prediction data includes information that predicts the traffic jam situation at least in the target time zone (including the time when the vehicle 5 is in operation) of the system charge / discharge plan.

FIG. 6 is a diagram showing an example of an operation plan stored in the storage unit 306 of the present embodiment. The vehicle # 1 shown in FIG. 6 shows the identification information of the vehicle 5-1. Similarly, vehicle #i (i is a natural number) indicates identification information of vehicle 5-i. As shown in FIG. 6, in the operation plan, the route, the departure time, and the arrival time are stored for each identification information indicating the vehicle 5, that is, for each vehicle 5. In addition, after the final route, which is the last route of the day for each vehicle 5, the number and departure of the return route for returning from the arrival point of the final route to the business establishment where the charging system 1 is installed. The time and arrival time are also listed. The arrival time on the return route is the return time, which is the time when the vehicle 5 arrives at the charging system 1. In FIG. 6, for the sake of clarity, the route, departure time, and arrival time are indicated for each vehicle 5, but the format may indicate which vehicle 5 is used for each route. ..

Further, although not shown, the storage unit 306 also stores information indicating the position of each route on the map, and the planning unit 302 uses this to correspond to the congestion prediction data and the route. To grasp. Then, if it is predicted that there will be congestion on the final route and the return route on which the vehicle 5 travels at the end of the day for each vehicle 5, the planning unit 302 will delay the delay time due to the congestion on these routes. Is predicted, and the return time is predicted by adding the predicted delay time to the return time in the operation plan. The planning unit 302 determines, for example, a correspondence between the length of the congested section and the delay time in advance, and obtains the delay time according to the correspondence and the length of the congested section. If the congestion prediction data includes the time required for passing through the congestion section, the planning unit 302 may predict the delay time using that time. The method of predicting the delay time in the planning unit 302 is not limited to these methods.

The planning unit 302 of the EMS 30 determines the charging schedule based on the return time of each vehicle 5. The return time used at this time reflects the above-mentioned prediction. For example, the planning unit 302 of the EMS 30 allocates one frame, that is, one hour to each bus. For example, assuming that there are two chargers 10, vehicle # 5 returns at 20:00, vehicles # 2 and # 4 return at 21:00, and vehicles # 1, # 3, and # 6 return at 22. Suppose you are planning to return to the timetable. In this case, the planning unit 302 allocates the charging time to the vehicle # 5 so as to charge the vehicle # 5 for 1 hour from 21:00 using either of the two chargers 10. Further, the planning unit 302 allocates the charging time of 1 hour from 22:00 of each of the two chargers 10 to the vehicles # 2 and # 4. Next, the planning unit 302 allocates the charging time of 1 hour from 23:00 of each of the two chargers 10 to two of the vehicles # 1, # 3, and # 6. The remaining one of the vehicles # 1, # 3, and # 6 is assigned a charging time after 24:00 (00:00 on the day after the planning date). Since the charging schedule determined here is changed according to the required charging amount for each vehicle 5 as described later, it can be said that it is a temporary charging schedule when the charging time is evenly allocated. The provisional charging schedule may be determined according to the daily mileage of the vehicle 5, the capacity of the storage battery of the vehicle 5, and the like, and the specific method for determining the charging schedule is not limited to the above-mentioned example.

FIG. 7 is a diagram showing an example of a charging schedule according to the present embodiment. In the present embodiment, in order to create a system charge / discharge plan for 24 hours on the next day, first, in step S1 shown in FIG. 5, a charging schedule for 24 hours is created from 7:00 on the next day. In FIG. 7, in addition to the period to be planned on the next day, the period in which the system charge / discharge plan has already been created by the process of FIG. 5 on the previous day is described as the update target on the day. In step S1 shown in FIG. 5, the charging schedule after 7:00 on the next day, which is described as the planning target for the next day, is determined based on the traffic congestion prediction data and the operation plan. As described above, the charging schedule created in step S1 is a tentative schedule, and may be changed by the subsequent processing in step S8 shown in FIG. The final charging schedule after all the processing shown in FIG. 5 is completed is stored in the storage unit 306 as a part of the system charging / discharging plan shown in FIG.

Returning to the description of FIG. 5, after step S1, the planning unit 302 of the EMS 30 calculates the required charge amount for each vehicle 5 based on the SOC, the operation plan, and the congestion prediction data (step S2). First, the planning unit 302 obtains the mileage of each vehicle 5 on the next day based on the operation plan, and predicts the amount of electricity stored due to the traveling. Based on the congestion prediction data, the planning unit 302 assumes that if there is a section in the route where congestion is predicted to occur, fuel efficiency will deteriorate in this section, and according to the length of the section where congestion is expected. Calculate the amount of correction. The planning unit 302 calculates the power consumption of the next day by adding the correction amount to the prediction result of the amount of electricity stored reduced by traveling. The planning unit 302 sets the "SOC at the time of returning to the next day", which is the SOC when the next day's running is completed. This "SOC at the time of returning the next day" is set including the storage of the margin amount in consideration of the prediction error and the like. That is, the "SOC at the time of returning home the next day" is set so that the remaining amount of the storage battery of the vehicle does not run out before returning home even if the power consumption of the vehicle 5 on the next day is different from the predicted value. The planning unit 302 calculates the required charge amount for each vehicle 5 based on the current (current) SOC, the next day's power consumption, and the "the next day's return SOC". For example, the planning unit 302 sets a condition for the SOC at the end of the next day's running, and calculates the required charge amount so that the SOC at the end of the next day's running satisfies this condition.

FIG. 8 is a diagram showing an example of charge amount management data used for calculating the required charge amount of the present embodiment. Since the charge amount management data is used temporarily, it is stored in the storage unit 306, although it is not shown in FIG. If the vehicle 5 has already returned on the day, the planning unit 302 reads the SOC of the corresponding vehicle 5 from the SOC data acquired from the vehicle 5 and stored in the storage unit 306, and the charge amount. Store the management data as the SOC when returning on the day. If the vehicle 5 has not yet returned on the day, the "SOC at the time of returning the next day" set in the process of creating the system charge / discharge plan on the previous day is used as the SOC at the time of returning on the day. That is, the process shown in FIG. 5 is performed on the previous day as well, and at this time, the “SOC at the time of returning to the next day” is set and stored in the charge amount management data. In step S2, if the SOC at the time of returning on the day is not actually measured, the "SOC at the time of returning on the next day" in the charge amount management data can be duplicated and stored in the SOC column at the time of returning on the day. Good. The column of "SOC at the time of returning the next day" is updated with a new value of "SOC at the time of returning the next day" in step S2 as described later. The "SOC at the time of returning the next day" does not have to be updated every day, and the same value may be used for a certain period.

Of the charge amount management data shown in FIG. 8, the capacity indicates the capacity of the storage battery of each vehicle 5, and is input in advance by the user, for example. As described above, the planning unit 302 calculates the power consumption of the next day and stores it in the charge amount management data. The planning unit 302 sets the SOC at the time of returning home the next day, and stores this value in the charge amount management data. Then, the planning unit 302 calculates the remaining amount of the storage battery for each vehicle 5 by using the SOC and the capacity of the charge amount management data at the time of returning on the day. Further, the planning unit 302 uses the calculated remaining amount to set the SOC when the remaining amount of the storage battery of the vehicle 5 on the next day is reduced by the predicted value of the power consumption on the next day to be "SOC at the time of returning to the next day". The required charge amount for the next day is calculated so as to be the set value of. For example, in the example shown in FIG. 8, it is assumed that the condition that the SOC at the end of the next day's running is satisfied is that the SOC at the end of the next day's running is 30% or more and less than 90%. Then, in the example shown in FIG. 8, "SOC at the time of returning the next day" is set to 40% in consideration of an error so that the SOC at the end of the next day's running satisfies this condition, and this value is set. Is used to calculate the required charge amount for the next day. The method of calculating the required charge amount is not limited to this example.

Returning to the description of FIG. After step S2, the planning unit 302 of EMS 30 calculates the charging time and charging power for each vehicle 5 (step S3). Specifically, the planning unit 302 calculates the charging power based on the charging schedule determined in step S1 and the required charging amount calculated in step S2. Thereby, the charging power of each charger 10 is determined. FIG. 9 is a diagram showing an example of charging power of each charger 10 in the present embodiment.

Returning to the description of FIG. After step S3, the planning unit 302 of the EMS 30 predicts the amount of power generated by the photovoltaic power generation facility 22 using the solar radiation amount prediction data, and predicts the power to be charged in the storage battery 20 (step S4). Specifically, the planning unit 302 first extracts the forecast data of the solar radiation amount of the next day in the area corresponding to the place where the charging system 1 is installed from the solar radiation amount prediction data stored in the storage unit 306. , The power generation amount per hour is calculated based on the extracted forecast data, the rated output of the power generation amount of the photovoltaic power generation facility 22, and the power generation efficiency. The power generation efficiency is preset according to the photovoltaic power generation equipment 22 to be installed. In addition, the planning unit 302 obtains the incident angle of sunlight on the solar cell panel based on the installation angle of the solar cell panel and the predicted value of the solar altitude, and also considers the incident angle for each time zone. The amount of power generation may be calculated.

Further, as described above, since the EMS 30 has acquired the actual value of the amount of power generated by the photovoltaic power generation facility 22, this is stored in the storage unit 306, and the planning unit 302 reflects the incident angle. Alternatively, the predicted value of the amount of power generation may be corrected based on the actual amount of power generation in the past. For example, the EMS 30 stores the actual value of the past power generation amount in the storage unit 306 together with the date at that time. Then, the planning unit 302 calculates a correction coefficient depending on the incident angle using data obtained by averaging the amount of power generation at the same time one year ago, and predicts the amount of solar radiation and the photovoltaic power generation facility 22. The predicted value of the power generation amount may be obtained based on the rated output of the power generation amount and the power generation efficiency. Further, the actual power generation amount may be stored in the storage unit 306 together with the air temperature, and the planning unit 302 may correct the predicted value of the power generation amount by using the temperature of the next day and the actual power generation amount in the past. .. The method for predicting the amount of power generation is not limited to the above-mentioned example, and any method may be used.

FIG. 10 is a diagram showing an example of the amount of power generated by the photovoltaic power generation facility 22 of the present embodiment. In the example shown in FIG. 10, after 7 o'clock on the next day is the target of the plan for the next day, and before that, the amount of power generation to be updated on the current day predicted at the time of creating the plan on the previous day. In the period to be updated on the day, the predicted value of the solar power generation amount is updated with the actual value every time the actual power generation amount of the photovoltaic power generation facility 22 is measured.

The planning unit 302 calculates the charging power when the storage battery 20 is charged by the power generation of the photovoltaic power generation facility 22 based on the predicted value of the power generation amount of the photovoltaic power generation facility 22 on the next day. Further, the planning unit 302 predicts the remaining amount of the storage battery 20 at, for example, 20:00 after sunset on the next day, based on the predicted value of the power generation amount of the photovoltaic power generation facility 22 on the next day, and the remaining amount of the storage battery 20. When the predicted value of the amount is less than the predetermined remaining amount threshold value, the planning unit 302 plans to charge the storage battery 20 with the purchased power. The above-mentioned 20:00 is an example, and the time for checking the remaining amount of the storage battery 20 may be any time before the main charging time zone of the vehicle 5 and after sunset, depending on the season and the like. It can be changed as appropriate. The remaining amount threshold value of the storage battery 20 is set according to, for example, the electric power assumed to be required for suppressing the peak of the electric power at the time of charging by the charger 10. Specifically, the planning unit 302 plans to charge the storage battery 20 in a time zone when the electricity charge is low before the time when the remaining amount of the storage battery 20 is confirmed. For the charging power and charging time of the storage battery 20 when charging is planned by the purchased power, for example, the predicted value of the amount of power generated by the photovoltaic power generation facility 22 after the time zone and the capacity of the storage battery 20 are taken into consideration. It is determined. The planning unit 302 calculates the charging power to the storage battery 20 by adding the charging power when the storage battery 20 is charged by the power generated by the photovoltaic power generation facility 22 and the charging power from the purchased power for each time zone. ..

Returning to the description of FIG. After step S4, the planning unit 302 of the EMS 30 allocates the electric power stored in the storage battery 20 to a time zone in which the electricity charge is high (step S5). Specifically, the planning unit 302 obtains by discharging the storage battery 20 by charging with the charger 10 during a time period when the electricity charge is high, assuming that a part of the electric power stored in the storage battery 20 is discharged. Plan to use the available power. At this time, the power to be discharged from the storage battery 20 allocated by the planning unit 302 may be determined in any way. For example, the predicted value of the remaining amount of the storage battery 20 at 21:00 on the next day and the predicted value in advance. It is determined based on the difference from the specified value. The reason for doing this is as follows. The charging power for charging the vehicle 5 is mainly covered by the power supplied from the power system 2, that is, the purchased power, and the power discharged from the storage battery 20. In the present embodiment, the system is charged so that the total value of the purchased electric power when charging the vehicle 5 does not exceed the contracted electric power or the upper limit value requested by the electric power company, and the cost borne by the operator is suppressed. Create a discharge plan. Therefore, the planning unit 302 temporarily secures a predetermined value of the stored amount stored in the storage battery 20 in order to suppress the peak, and allocates the rest to the time zone when the electricity charge is high. If it is determined in the process described later that the total value of the charging power exceeds the contracted power or the upper limit value requested by the electric power company, the discharge schedule of the storage battery 20 will be reviewed. The value may be set in any way. The predicted value of the remaining amount of the storage battery 20 is calculated based on the measured value of the SOC of the storage battery 20 and the charging and discharging schedule of the storage battery after the time when the SOC is actually measured.

In the example shown in FIG. 4, the electricity charge is cheaper at 0:00 than at 21:00. Therefore, the electric power discharged from the storage battery 20 is allocated during the time when the electricity charge is high such as 21:00. For example, when 21:00 to 7:00 the next day is the main charging time for charging the vehicle 5, it is assumed that the electricity charge is higher from 21:00 to 23:00 than in other time zones. In this case, the planning unit 302 evenly allocates the electric power discharged from the storage battery 20 in the time zone from 21:00 to 23:00.

Returning to the description of FIG. After step S5, the planning unit 302 of the EMS 30 determines whether or not there is a time zone in which the power supplied from the system, that is, the power system 2 exceeds the threshold value (step S6). This threshold is, for example, the contracted power or the upper limit requested by the power company. This threshold value may be set to a value smaller than the contracted power or the upper limit value requested by the electric power company with a margin. Specifically, in step S6, the planning unit 302 obtains the power supplied from the system, that is, the purchased power, by subtracting the discharge power from the storage battery 20 from the total value of the charging power of each charger 10. When the charging schedule and the charging power are determined in steps S1 and S3, the total value of the charging power in each time zone is calculated as shown in the lowermost part of FIG. Further, in step S5, the discharge power of the storage battery 20 in each time zone is determined. Therefore, the planning unit 302 can calculate the purchased power using these results. Then, the planning unit 302 determines whether or not there is a time zone in which the purchased power exceeds the threshold value.

When there is a time zone in which the power supplied from the grid exceeds the threshold value (step S6 Yes), the planning unit 302 of the EMS 30 determines whether or not the charging schedule and the charging power can be adjusted (step S7). In step S1, the charging schedule was determined so that the charging time was evenly allocated to each vehicle 5 based on the return time. On the other hand, the charging time assigned to each vehicle 5 may be changed from the charging schedule determined in step S1. For example, it is assumed that the charger 10-1 is assigned to charge one of the vehicles 5 from 21:00 to 3:00, and the charger 10-1 is not scheduled to charge after 4:00. In such a case, even if the charging time of some of the vehicles 5 scheduled to be charged by the charger 10-1 is lengthened and the charging power is lowered, the first train of the vehicle 5 to be charged last If it is in time for the start of operation, there will be no problem with operation. Therefore, the planning unit 302 does not hinder the operation even if the charging time of the vehicle 5 scheduled to be charged in the time zone when the electric power supplied from the system exceeds the threshold value is lengthened based on the operation plan and the charging schedule. If so, it is determined that the charging schedule and charging power can be adjusted.

When the charging schedule and the charging power can be adjusted (step S7 Yes), the planning unit 302 adjusts the charging schedule and the charging power (step S8). Specifically, the planning unit 302 prolongs the charging time of at least a part of the vehicles 5 scheduled to be charged in the time zone when the electric power supplied from the grid exceeds the threshold value, and charges the vehicle 5 accordingly. Lower the power. For example, it is assumed that the vehicle 5-6 has a power receiving schedule for charging using the charger 10-1 from 22:00 to 1 hour, and it is determined in step S6 that the power supplied from the system at 22:00 exceeds the threshold value. .. In this case, the planning unit 302 sets the charging time of the vehicle 5-6 to 2 hours from 22:00, and sets the charging start time of the vehicle 5 to which charging by the charger 10-1 is assigned after 23:00 to 1. Shift back by time. Then, the planning unit 302 reduces the charging power of the charger 10-1 from 22:00 to 1/2. As a result, the power supplied from the system at 22:00 can be reduced. After step S8, the planning unit 302 carries out the process from step S6 again.

If it is determined in step S6 that there is no time zone in which the power supplied from the grid exceeds the threshold value (step S6 No), the plan creation unit 302 determines the system charge / discharge plan for the next day (step S10). Specifically, in step S10, the power exchange for 24 hours from 7:00 on the next day calculated in the processes up to step S9 is reflected in the system charge / discharge plan of the next day illustrated in FIG. 4, and the reflected next day. The system charge / discharge plan of the above is stored in the storage unit 306. As shown in FIG. 4, the storage unit 306 stores not only the newly created system charge / discharge plan for the next day but also the system charge / discharge plan created the previous day.

When it is determined in step S7 that the charging schedule and the charging power cannot be adjusted (step S7 No), the planning unit 302 changes the discharging schedule of the storage battery 20 (step S9). In step S5, the electric power discharged from the storage battery 20 is allocated to the time zone when the electricity charge is high, but in step S9, the electric power supplied from the grid is further discharged from the storage battery 20 so as to be equal to or less than the threshold value. Review the power allocation. As described in the explanation of step S5, the entire amount of electricity stored in the storage battery 20 is not allocated to the time zone when the electricity charge is high, but a predetermined value is left. Therefore, first, the planning unit 302 changes the discharge schedule so that the electric power supplied from the system exceeds the threshold value within the range of the remaining amount of the storage battery 20. Even after this change, if there is a time zone in which the power supplied from the grid exceeds the threshold value, the planning unit 302 cancels the allocation of the power discharged from the storage battery 20 in step S5, and cancels the canceled portion from the grid. Allocate to the time zone when the supplied power exceeds the threshold. As a result, the power supplied from the system can be set to the threshold value or less by using the power discharged from the storage battery 20.

As described above, the planning unit 302 charges and discharges the system so that the power obtained by subtracting the power supplied by the discharge from the storage battery 20 from the total value of the charging power of the chargers 10-1 to 10-n is equal to or less than the threshold value. Make a plan. In addition, the plan creation unit 302 creates a charge / discharge plan for the storage battery 20 based on the predicted value of the amount of power generation and the charge of the electric power for each time zone.

In the above-described example, the charging schedule and charging power of the charger 10 are tentatively determined by the processes of steps S1 to S4, the discharge power of the storage battery 20 is tentatively allocated during the time when the electricity charge is high, and the vehicle 5 is charged. When the total value of the charging power at the time of charging exceeds the threshold value, the discharge schedule of the storage battery 20 is changed. The discharge schedule of the storage battery 20 is determined so that the total value of the purchased electric power when charging the vehicle 5 does not exceed the contracted electric power or the upper limit value required by the electric power company, and the cost borne by the operator is suppressed. The method is not limited to the above-mentioned example, and any method may be used. For example, after tentatively determining the charging schedule and charging power of the charger 10, the discharge power of the storage battery 20 is allocated at a time when the total value of the charging power exceeds the contract power or the upper limit value requested by the power company, and then the discharge power of the storage battery 20 is allocated. When the stored amount of the storage battery 20 remains, the discharge power of the storage battery 20 may be allocated to the time zone when the electricity charge is high. Alternatively, a method may be used in which the charging schedule of the charger 10 and the charging power are not determined in advance, and the charging schedule of the charger 10 and the discharge schedule of the storage battery 20 are simultaneously solved as parameters. For example, the planning unit 302 uses the sum of the electricity charges as the evaluation function, and minimizes the evaluation function on the condition that the total value of the charging power does not exceed the contracted power or the upper limit value requested by the electric power company. Alternatively, the charging schedule of the charger 10 and the discharging schedule of the storage battery 20 may be determined so that the value of the evaluation function is equal to or less than the threshold value.

Further, in the above example, in step S4, the storage battery 20 is charged so that the remaining amount of the storage battery 20 at 20:00 is equal to or higher than the remaining amount threshold value. If the value exceeds the contract power, the charge / discharge plan of the storage battery 20 is reviewed so as to charge the battery in excess of the remaining amount threshold value. Further, depending on the purchased electricity charge, charging may be performed so that the remaining amount exceeds the remaining amount threshold value. For example, the time when the electricity charge is cheaper than the electricity charge between 7:00 and 21:00, which is the main operating time zone of the vehicle 5, and between 21:00 and 7:00, which is the main charging time zone of the vehicle 5. Suppose there is a band. In this case, it is possible to suppress the cost borne by the business operator by charging the storage battery 20 with the purchased electric power as much as possible in the time zone, as compared with charging with the purchased electric power between 21:00 and 7:00. Therefore, in such a case, the planning unit 302 takes into consideration the predicted value of the amount of power generated by the photovoltaic power generation facility 22 after the time zone, and takes the time within a range not exceeding the capacity of the storage battery 20. Increase the charge by the purchased power in the band.

Next, the update process of the system charge / discharge plan of the present embodiment will be described. As described above, the EMS 30 creates a system charge / discharge plan for the next day and holds it in the storage unit 306. On the other hand, after creating the system charge / discharge plan for the next day, the actual state may differ from the forecast. For example, there may be a deviation from the predicted value of the actual situation of traffic congestion, a deviation from the predicted value of the power generation amount of the photovoltaic power generation facility 22 due to a sudden change in the weather, or the like. In such a case, if the system charge / discharge plan is not changed, the remaining amount of the storage battery of the vehicle 5 may be insufficient, the power supplied from the system may exceed the threshold value, or the opportunity of cost control may be missed. .. Therefore, the EMS 30 of the present embodiment executes at least a part of the processes shown in step S4 when the input information is changed. For example, the EMS 30 acquires the SOC at the time of returning of each vehicle 5, and if the acquired SOC is different from the predicted SOC, the steps S2 and S2 shown in FIG. 5 are shown according to the measured value of the SOC. The calculation of S3 is performed to change the charging power, and the processes after step S6 are performed.

For example, of the charging power shown in FIG. 9, the charging power of the vehicle 5-1 that is planned to be charged by the charger 10-1 in 1 hour from 0 o'clock is 15 kW when the system charge / discharge plan of the previous day is created. It is assumed that the power is 20 kW by the calculation using the measured value on the day. When the charging power of each charger 10 is changed in this way, the total value also changes, and the total value becomes 255 kW. It is assumed that the threshold value used in the determination in step S6 is 250 kW, and the total value is 250 kW in the calculation on the previous day. Since the storage battery 20 is not scheduled to be discharged at 0 o'clock on this day, the threshold value will be exceeded when the power supplied from the system reaches 255 kW. The EMS 30 determines Yes in the determination of step S6, and the charging schedule and charging power are adjusted in steps S7 and S8. At 0 o'clock in the period to be updated on the day shown in FIG. 4, the charging schedule after this adjustment is made is described, and the vehicle 5-1 is assigned a charging time of 2 hours from 0 o'clock. Has been changed to. As a result, the power supplied from the grid can be set to be equal to or lower than the threshold value.

Further, when the amount of power generated by the photovoltaic power generation facility 22 becomes less than the predicted value due to a sudden change in the weather, the remaining amount of electricity stored in the storage battery 20 may be insufficient, and the power supplied from the system may exceed the threshold value. Therefore, the EMS 30 acquires the latest solar radiation amount data from the weather forecast center 31, and when the solar radiation amount is less than the forecast, the charging power or charging time of the storage battery 20 by the purchased power is increased. As a result, even when the weather changes suddenly, the power supplied from the grid can be kept below the threshold value. In this way, the EMS 30 updates the system charge / discharge plan as appropriate based on the latest information. Here, an example in which the EMS 30 acquires the latest information will be described, but the information acquired by the EMS 30 for the update process may be the information updated from the time of creating the system charge / discharge plan, and is the latest. It does not have to be information.

FIG. 11 is a flowchart showing an example of the update processing procedure of the system charge / discharge plan in the EMS 30 of the present embodiment. First, the update determination unit 303 of the EMS 30 acquires the updated information (step S11). Specifically, the update determination unit 303 of the EMS 30 acquires the latest information from at least one of the weather forecast center 31, the road traffic center 32, and the charger 10 via the communication unit 301.

The update determination unit 303 of the EMS 30 determines whether or not the plan needs to be changed (step S12). Specifically, the update determination unit 303 compares the latest information with each predicted value stored in the storage unit 306, and determines whether or not the latest information differs from the predicted value by a certain amount or more. When it is determined that the plan does not need to be changed (step S12 No), the update determination unit 303 repeats the processes of steps S11 and S12. When it is determined that the plan needs to be changed (step S12 Yes), the EMS 30 modifies the system charge / discharge plan (step S13), and repeats the process from step S11.

Specifically, in step S13, the update determination unit 303 specifies the process required to be updated to the plan update unit 304, and the plan update unit 304 executes the process specified by the update determination unit 303 to charge the system. Modify the discharge plan. The process designated by the update determination unit 303 is determined according to the information to be updated. For example, when it is necessary to update the plan because the SOC of the storage battery of the vehicle 5 is updated with the measured value, steps S2 and S3 and steps S6 and subsequent steps shown in FIG. 5 are carried out as described above. To. When it is necessary to update the plan because the amount of solar radiation is different from the predicted value, step S4 and subsequent steps shown in FIG. 5 are carried out. When it is necessary to update the plan because the congestion data is different from the predicted value, steps S1, S2, S3 and steps S6 and subsequent steps shown in FIG. 5 are carried out. Here, although a part of the processing of FIG. 5 is executed according to the updated information, it is possible to perform all of the processing shown in FIG. 5 again after reflecting the updated information. Good.

Based on the system charge / discharge plan created and updated as described above, the command generation unit 305 generates a charge command for each of the charger 10-1 to 10-n and the storage battery PCS21. For example, the command generation unit 305 generates a charging command instructing charging with the charging power corresponding to each of the chargers 10-1 to 10-n for each time zone based on the system charge / discharge plan. It transmits to the chargers 10-1 to 10-n via the communication unit 301. Further, the command generation unit 305 generates a discharge command for instructing the discharge of the storage battery 20 or a charging command for instructing charging for each time zone based on the system charge / discharge plan, and sends the storage battery PCS 21 via the communication unit 301. Send.

In the above description, the example of charging the storage battery of the vehicle 5 has been described, but the discharge from the storage battery of the vehicle 5 may also be considered. When there is a storage battery of the vehicle 5 having a large remaining amount, it may be planned to use this storage battery in the same manner as the storage battery 20 to suppress the electric power supplied from the system. Further, the electric power may be interchanged between the storage batteries of the vehicle 5. For example, using a charger / discharger capable of discharging as the charger 10, among the storage batteries of the vehicle 5, the storage battery of the vehicle 5 having a sufficient remaining amount even after the next day's running is completed is discharged to discharge the storage battery of the other vehicle 5. It may be planned to be used to charge the storage battery of. In particular, it is conceivable to charge an extra charge within a range that does not exceed the electricity contract power during the time when the electricity charge is low, and to accommodate other vehicles in the case where the charge must be performed during the time when the electricity charge is high.

Further, in the present embodiment, an example in which a business operator or the like managing the charging system 1 purchases electric power by a contract with an electric power company has been described, but the present invention is not limited to this, and the case where the business operator or the like procures from the electric power market. Similarly, the method for creating a system charge / discharge plan according to the present embodiment can be applied to the above. When considering the electricity procured from the electricity market, for example, EMS30 compares the estimated price of the electricity market with the electricity rate based on the contract with the electric power company for each time zone, and sets the lower rate as the electricity rate. It can be used to create a system charge / discharge plan similar to the example described above. If the estimated price of the electric power market is higher than the electric power based on the contract with the electric power company, the electric power generated by the solar power generation facility 22 is sold in the electric power market, and the storage battery 20 is charged with the electric power purchased from the electric power company. You may. Further, the EMS 30 may create a system charge / discharge plan in consideration of selling the electric power discharged from the storage battery 20 and the storage battery of the vehicle 5 in the electric power market.

Further, the EMS 30 acquires a long-range weather forecast from the weather forecast center 31, the planning unit 302 predicts the amount of power generation for multiple days in the future based on the long-range forecast, and charges and discharges the storage battery 20 based on the prediction result. You may make a plan. For example, when it is predicted that it will rain or become cloudy for several days in a row and the amount of power generated by the photovoltaic power generation facility 22 is expected to decrease, the planning unit 302 increases the amount of electricity stored in the storage battery 20 more than usual. Create a charge / discharge plan for the storage battery 20 so as to keep it.

In the above-described example, an example in which the EMS 30 performs both the creation of the system charge / discharge plan and the charge / discharge control of the charger 10 and the storage battery PCS21 has been described, but the plan creation for creating the system charge / discharge plan has been described. The device and the charge / discharge control device that controls the charge / discharge of the charger 10 and the storage battery PCS21 may be provided separately. In this case, the system charge / discharge plan is transmitted from the plan creation device to the charge / discharge control device.

As described above, the EMS30 of the present embodiment creates a future system charge / discharge plan based on the predicted value such as the solar radiation amount prediction data, and then based on the latest data such as the solar radiation amount prediction data. , Updated the system charge / discharge plan. Therefore, a more appropriate charging schedule can be created as compared with the case where the latest data is not taken into consideration.

Embodiment 2.
FIG. 12 is a diagram showing a configuration example of the charging system according to the second embodiment of the present invention. As shown in FIG. 12, the charging system 1a of the second embodiment includes a converter 41, an EMS30, a charger 42-1 to 42-n, a bus voltage detector 44, 45, 46-1 to 46-n, and a connection. It includes units 11-11 to 11-n, a storage battery 20, a storage battery PCS43, and a photovoltaic power generation facility 22. The EMS 30, the connection unit 11-11 to 11-n, the storage battery 20, the storage battery PCS43, and the photovoltaic power generation facility 22 are the same as those in the first embodiment. Components having the same functions as those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and duplicate description will be omitted. Hereinafter, the parts different from those of the first embodiment will be mainly described.

In the present embodiment, the converter 41 converts the three-phase AC power supplied via the transformer 3 into DC power and supplies it to the DC bus 40. A DC load 47 is connected to the DC bus 40. In the present embodiment, the chargers 42-1 to 42-n, which are a plurality of chargers, and the storage battery PCS43, which is a control device, are connected to the DC bus 40. Each of the chargers 42-1 to 42-n of the present embodiment converts the DC power supplied from the DC bus 40 into DC power for charging the storage battery mounted on the vehicle 5, and the converted DC. Electric power can be supplied to the storage battery of the vehicle via the corresponding connection units 11-11 to 11-n. The bus voltage detectors 44, 45, 46-1 to 46-n measure the voltage of the DC bus 40 and output the measurement results to the converter 41, the charger 42-1 to 42-n, and the storage battery PCS43, respectively.

Although the DC voltage of the DC bus 40 is arbitrary, it is a power bus line that supplies a large amount of power, and in order to prevent current loss as much as possible, the voltage is preferably in the hundreds of volts class.

Similar to the charging system 1 of the first embodiment, the charging system 1a of the second embodiment is installed in a parking lot of the vehicle 5, a business establishment of a business operator managing the vehicle 5, a station of the vehicle 5, and the like, and a plurality of charging systems 1a are installed. It is possible to charge the vehicle 5 at the same time. When charging a large vehicle 5 such as a bus, the storage battery capacity of the vehicle 5 is large, and the number of vehicles 5 to be charged is also large, so that the electric power required for charging becomes a very large value. Therefore, it is very important to suppress power loss from the viewpoint of energy saving and cost control. Since the vehicle 5 is charged with DC power, a loss occurs when the AC power is converted into DC power by each charger 10 as in the first embodiment. This loss is generally about several percent, and a loss of about 3-4 kW per 100 kW occurs, and a considerable amount of loss occurs when considering the entire charging system 1a. Therefore, the charging system 1a of the present embodiment is provided with the converter 41 to supply DC power to the chargers 42-1 to 42-n and the storage battery PCS43 via the DC bus 40. As a result, it is possible to suppress power loss, save energy, and reduce costs.

The EMS 30 of the present embodiment is connected to the weather forecast center 31 and the road traffic center 32 via the public line 33, respectively, as in the first embodiment. Although the example including the EMS 30 of the first embodiment has been described here, the EMS included in the charging system 1a of the present embodiment does not have to be the same as that of the first embodiment. For example, without considering the information of the weather forecast center 31 and the road traffic center 32, a system charge / discharge plan is created based on the operation plan and the predicted value of the power generation amount of the photovoltaic power generation facility 22 based on the past results. The chargers 42-1 to 42-n and the storage battery PCS43 may be controlled based on the created system charge / discharge plan.

The chargers 42-1 to 42-n and the storage battery PCS43 perform charging or discharging based on a command from the EMS 30 in the same manner as the chargers 10-1 to 10-n and the storage battery PCS21 of the first embodiment, respectively. In the present embodiment, when the balance between the supply and demand of electric power for the DC bus 40 is lost, it appears as an increase or decrease in the voltage of the DC bus 40. If the voltage of the DC bus 40 is higher than the upper limit of the standard voltage range, it will lead to the failure of the chargers 42-1 to 42-n, and if the voltage of the DC bus 40 is lower than the lower limit of the standard voltage range, the current will increase and the charger 42 It leads to failure such as -1 to 42-n. Therefore, the converter 41 controls to keep the voltage of the DC bus 40 within the standard voltage range.

Specifically, in the converter 41 of the present embodiment, when the voltage measured by the bus voltage detector 44 is higher than the upper limit of the standard voltage range, the voltage measured by the bus voltage detector 44 is in the standard voltage range. Reduce the output power until Further, in the converter 41 of the present embodiment, when the voltage measured by the bus voltage detector 44 is lower than the lower limit of the standard voltage range, until the voltage measured by the bus voltage detector 44 reaches the standard voltage range. Increase the output power. As a result, the converter 41 keeps the voltage of the DC bus 40 within the standard voltage range.

In the present embodiment, the EMS 30 considers the electric power supplied from the converter 41 and the electric power supplied by discharging the storage battery 20, and the chargers 42-1 to 42- so as to balance the demand and the supply. The charging power is planned so as to calculate the charging power to n. However, it is conceivable that the balance between supply and demand may be lost due to factors such as an unexpected increase or decrease in power consumption of the DC load 47, and the voltage adjustment capacity of the converter 41 may be exceeded. Even in such a case, in order to keep the voltage of the DC bus 40 within the standard voltage range, it is desirable that the charger 42-1 to 42-n and the storage battery PCS43 can also perform the voltage control operation. This voltage control operation may be performed autonomously by the charger 42-1 to 42-n and the storage battery PCS43, or the EMS 30 measures the measured values of the bus voltage detectors 45, 46-1 to 46-n. It may be acquired to control each charger 42-1 to 42-n and the storage battery PCS43.

The operation when the chargers 42-1 to 42-n and the storage battery PCS43 autonomously control the voltage will be described. FIG. 13 is a flowchart showing an example of an autonomous voltage control operation in the storage battery PCS43 of the present embodiment.

As shown in FIG. 13, the storage battery PCS43 detects the bus voltage by acquiring the voltage measured by the bus voltage detector 45 (step S21). The storage battery PCS43 determines whether or not the bus voltage exceeds the upper limit value, that is, the upper limit of the standard voltage range (step S22). When the bus voltage exceeds the upper limit value (step S22 Yes), the storage battery PCS43 controls to lower the bus voltage regardless of the command from the EMS 30 (step S23), and repeats the processes after step S21. In the control of lowering the bus voltage, the storage battery PCS43 reduces the discharge power when the storage battery 20 is in the discharged state, and switches to charging when the discharge power has already been reduced and the discharge power is 0. On the other hand, when the storage battery 20 is in a charged state, the storage battery PCS43 increases the charging power in the control of lowering the bus voltage. In step S23, the storage battery PCS43 can be charged up to, for example, the maximum charging power.

When the bus voltage does not exceed the upper limit value (step S22 No), the storage battery PCS43 determines whether or not the bus voltage has fallen below the lower limit value, that is, the lower limit of the standard voltage range (step S24). When the bus voltage falls below the lower limit (step S24 Yes), the storage battery PCS43 controls to raise the bus voltage regardless of the command from the EMS 30 (step S25), and repeats the processes after step S21. In the control for raising the bus voltage, the storage battery PCS43 reduces the charging power when the storage battery 20 is in a charged state, and switches to discharging when the charging power has already been reduced and the charging power is 0. On the other hand, when the storage battery 20 is in a discharged state, the storage battery PCS43 increases the discharge power in the control of increasing the bus voltage. In step S25, the storage battery PCS43 can be discharged up to, for example, the maximum discharge power. When the bus voltage is not lower than the lower limit value (step S24 No.), the storage battery PCS43 repeats the processes after step S21.

Although the operation of the storage battery PCS43 has been described above as an example, the chargers 42-1 to 42-n also perform the same operation. However, in the operation of the chargers 42-1 to 42-n, the storage battery of the vehicle 5 is subject to charging or discharging in steps S23 and S25. When the voltage control capacity of the converter 41 is exceeded, the storage battery PCS43 is set to autonomously perform voltage control, and then the chargers 42-1 to 42-n are set to autonomously perform voltage control. I will do it. The time from the detection that the bus voltage deviates from the standard voltage range to the operation of charging or discharging is set so that the storage battery PCS43 is shorter than the chargers 42-1 to 42-n. .. As a result, when the storage battery PCS43 operates first and exceeds the control capacity of the storage battery PCS43, the chargers 42-1 to 42-n start autonomous voltage control. For example, even if the storage battery PCS43 starts voltage control, it cannot be further charged if the storage battery 20 is fully charged, and cannot be further discharged if the storage battery 20 has no remaining capacity. In such a case, even if the storage battery PCS43 starts the voltage control operation, the change in voltage cannot be suppressed. In the present embodiment, the chargers 42-1 to 42-n further control the voltage, so that even if the storage battery PCS43 cannot control the voltage, the deviation of the bus voltage from the standard voltage can be suppressed. In the above description, it is assumed that all of the storage battery PCS43 and the chargers 42-1 to 42-n have a function of autonomous voltage control, but some of them have an autonomous voltage. It may have a function to perform control.

Further, when the EMS 30 controls the voltage by controlling the chargers 42-1 to 42-n and the storage battery PCS43, the command generator 305 acquires the voltage measured by the bus voltage detector 45, and the figure shows the figure. An operation similar to the operation shown in No. 13 is performed. However, in step S23, instead of charging, a charging command is transmitted to the storage battery PCS43, and in step S25, instead of discharging, a discharging command is transmitted to the storage battery PCS43. The command generation unit 305 selects one of the chargers 42-1 to 42-n when the voltage deviates from the standard voltage range even after performing the above-mentioned control on the storage battery PCS43 for a certain period of time. Then, the selected charger is similarly subjected to the voltage control operation. Even if this operation is performed, if the voltage deviates from the standard voltage range, another charger is also performed to perform the voltage control operation. At this time, the EMS 30 may perform the voltage control operations in order from the device having the greatest influence on the voltage control, or may perform the voltage control operations in a predetermined order. Alternatively, if the voltage deviates from the standard voltage range even after performing the above-mentioned control on the storage battery PCS43 for a certain period of time, the command generation unit 305 simultaneously uses all the chargers 42-1 to 42-n. A voltage control operation may be performed. That is, when the voltage of the DC bus 40 deviates from the standard voltage range, the command generation unit 305 refers to the voltage control target device which is at least one of the charger 42-1 to 42-n and the storage battery PCS43. Stop generating commands based on the system charge / discharge plan. Then, a charge command or a discharge command for keeping the voltage of the DC bus 40 within the standard voltage range is generated and transmitted to the voltage control target device.

The EMS 30 generates a command for voltage control and transmits it to the charger 42-1 to 42-n and the storage battery PCS43, so that the charger 42-1 to 42-n and the storage battery PCS43 have an autonomous voltage control function. Even if the above is not provided, the deviation of the bus voltage from the standard voltage range can be suppressed. Further, the storage battery PCS43 autonomously controls the voltage, and the chargers 42-1 to 42-n operate based on the voltage control of the EMS 30, so that the autonomous voltage control and the voltage control by the EMS 30 can be combined. Good.

As described above, in the present embodiment, in the charging system 1a, the converter 41 converts the three-phase AC power into DC power and supplies it to the DC bus 40, and the DC bus 40 to the chargers 42-1 to 42. DC power can be supplied to −n and the storage battery PCS43. As a result, power loss can be suppressed. Further, the deviation of the bus voltage from the standard voltage can be suppressed by controlling the voltage of at least a part of the chargers 42-1 to 42-n and the storage battery PCS43, or the EMS30.

Embodiment 3.
FIG. 14 is a diagram showing a configuration example of the charging system according to the third embodiment of the present invention. As shown in FIG. 14, the charging system 1b of the third embodiment adds a switch 50-1 to 50-n to the charging system 1a of the second embodiment, and adds an EMS30 and a connection unit 11-1 to 11-n. It is the same as the charging system 1a of the second embodiment except that the EMS 30a and the connection units 11-1 to 11-n-3 are provided instead of the EMS 30a. Components having the same functions as those of the second embodiment are designated by the same reference numerals as those of the second embodiment, and duplicate description will be omitted. Hereinafter, the parts different from those of the second embodiment will be mainly described.

Note that FIG. 14 shows a configuration example in which the converter 41 is provided and DC power is supplied to the chargers 42-1 to 42-n and the storage battery PCS43, as in the second embodiment. Similarly, the three-phase AC power may be supplied to the in-facility power system 4 without the converter 41. In this case, instead of the chargers 42-1 to 42-n and the storage battery PCS43, the chargers 10-1 to 10-n and the storage battery PCS21 of the first embodiment are used.

In the present embodiment, as shown in FIG. 14, the chargers 42-1 to 42-n are connected to the corresponding switchers 50-1 to 50-n, respectively. The functions of the connection units 11-1-1 to 11-n-3 are the same as those of the connection units 11-1 to 11-n of the first embodiment, and hereinafter, the connection units 11-1-1 to 11-n- When 3 is not distinguished individually, it is described as a connection unit 11. The switches 50-1 to 50-n are a plurality of switches connected to the chargers 42-1 to 42-n and connected to the plurality of connection units 11. The switch 50-i (i is an integer up to 1 or n) is connected to the connection units 11-i-1 to 11-i-3, and the charger 42-i is connected to a plurality of connection units 11. It is possible to switch to any one of. When the chargers 42-1 to 42-n are not individually distinguished, they are referred to as the charger 42. When the switch 50-1 to 50-n is not individually distinguished, it is described as the switch 50. Although FIG. 14 shows an example in which each switch 50-1 to 50-n is connected to three connection units 11, the connection unit 11 to which each switch 50-1 to 50-n is connected is shown. The number of is not limited to three. Further, the number of connection units 11 connected to the switches 50-1 to 50-n may not be the same, and the number of connection units 11 may be different.

In this embodiment, the switching devices 50-1 to 50-n switch the connection unit 11 connected to the corresponding charger 42 based on the instruction from the EMS 30a. As a result, the number of chargers 42 can be suppressed, and all the vehicles 5 can be smoothly charged without having to reconnect to another vehicle after the charging is completed.

FIG. 15 is a diagram showing a functional configuration example of the EMS 30a of the present embodiment. As shown in FIG. 15, in the EMS 30a of the present embodiment, a switching control unit 307 is added to the EMS 30 shown in FIG. 2 of the first embodiment. The switching control unit 307 generates a switching instruction for instructing the switching devices 50-1 to 50-n to switch the connection unit 11 connected to the corresponding charger 42, and responds via the communication unit 301. It transmits to the switch 50-1 to 50-n.

The EMS30a of the present embodiment creates and updates the system charge / discharge plan as in the first embodiment, but the system charge / discharge plan of the present embodiment is of the switch 50-1 to 50-n. It also includes information indicating which connection unit 11 is to be connected to the connection destination, that is, the charger 42 corresponding to each of the switches 50-1 to 50-n. FIG. 16 is a diagram showing an example of a charging schedule of the chargers 42-1 to 42-n according to the present embodiment. In FIG. 16, the charger #i shows the identification information of the charger 42-i, and the connection unit #j is a connection unit 11 connected to each charger 42-i via the switch 50-i. The identification information of −i−j is shown. As described above, in the present embodiment, the vehicle 5 to be charged via each connection unit 11 is assigned to each charger 42. The system charge / discharge plan of the present embodiment is similar to the charging schedule shown in FIG. 16, except that information on which connection unit 11 the vehicle 5 charged by each charger 42 is connected to is added. It is the same as the system charge / discharge plan of the first embodiment. The switching control unit 307 generates and transmits a switching instruction to the switches 50-1 to 50-n according to the generated system charge / discharge plan.

The EMS30a of the present embodiment is realized by a computer system as in the first embodiment. The configuration example of this computer system is the same as that of FIG. 3 of the first embodiment. The switching control unit 307 is realized by the control unit 101 of FIG. 3, similarly to the plan creation unit 302, the update determination unit 303, the plan update unit 304, and the command generation unit 305.

Here, an example in which the charging system 1b includes an EMS 30a for creating a system charge / discharge plan as in the first embodiment has been described, but as described in the second embodiment, the EMS included in the charging system 1b is , It does not have to be the same as the first embodiment. For example, without considering the information of the weather forecast center 31 and the road traffic center 32, a system charge / discharge plan is created based on the operation plan and the predicted value of the power generation amount of the photovoltaic power generation facility 22 based on the past results. The chargers 42-1 to 42-n and the storage battery PCS43 may be controlled based on the created system charge / discharge plan.

As described above, the switching control unit 307 performs switching control of the switching devices 50-1 to 50-n according to the system charge / discharge plan, but may further have the following functions. Each vehicle 5 is connected to the connection unit 11 based on the system charge / discharge plan when returning to the office where the charging system 1b is installed. At this time, when the vehicle 5 returns, the charger 42 scheduled to charge the vehicle 5 may be charging another vehicle 5. For example, it is assumed that the vehicle 5-2 is planned to be charged by the charger 42-1 via the connection unit 11-1-2 from 23:00. At 21:00, the vehicle 5-2 returns and is connected to the connection unit 11-1-2, at which time the charger 42-1 charges the vehicle 5-1 connected to the connection unit 11-1-1. Suppose it was inside. In such a case, if only the switching control is performed according to the system charge / discharge plan, the EMS 30a cannot acquire the SOC of the storage battery of the vehicle 5-2 until the scheduled start time of charging of the vehicle 5-2. In the present embodiment, at the same time that the vehicle 5 is connected to the connection unit 11, the connection unit 11 acquires the SOC of the storage battery of the vehicle 5 and notifies the corresponding switches 50-1 to 50-n. Then, the switches 50-1 to 50-n notify the EMS 30a of the acquired SOC. The EMS30a updates the system charge / discharge plan when it is necessary to update the system charge / discharge plan based on the acquired SOC.

For example, the vehicle 5-1 in which the charger 42, to which the switch 50-1 corresponds via the first connection unit, which is one of the plurality of connection units 11 to which the switch 50-1 is connected, is the first mobile body. Is charging. During this charging, the switch 50-1 is a second moving body other than the first moving body to the second connecting unit other than the first connecting unit among the plurality of connected connecting units 11. Suppose a vehicle 5-2 is connected. In this case, the switch 50-1 acquires the SOC, which is the remaining amount information indicating the remaining amount of the storage battery included in the second moving body, from the second moving body via the second connecting unit, and goes to the EMS 30a. Send. Alternatively, when the vehicle 5-2 is connected, the connection unit 11-1-2 notifies the EMS 30a that the vehicle 5 is connected via the switch 50-1. Upon receiving this notification, the EMS3a temporarily stops charging the vehicle 5-1 connected to the connection unit 11-1-1 to the charger 42-1 and charges the switch 50-1 to the charger. Instruct to switch the connection destination of 40-1 to the connection unit 11-1-2. After this switching, the charger 42-1 acquires the SOC of the vehicle 5-2 and transmits it to the EMS 30a. When the EMS 30a receives the SOC of the vehicle 5-2, it instructs the switch 50-1 to switch the connection destination of the charger 40-1 to the connection unit 11-1-2, and sends the interrupted vehicle 5-1 to the vehicle 5-1. Instruct the charger 40-1 to resume charging. Then, the plan update unit 304 of the EMS 30a updates the system charge / discharge plan based on the new SOC acquired by the switch 50-1 to 50-n from the second mobile body.

FIG. 17 is a flowchart showing an example of the switching control process of the present embodiment. In FIG. 17, the charger 42 does not automatically transmit the SOC when the vehicle 5 is connected to the connection unit 11, but the charger 42 detects the connection of the vehicle 5 after the connection unit 11 detects the connection of the vehicle 5. Is shown as an example of getting. As shown in FIG. 17, the switching control unit 307 performs switching control according to the system charge / discharge plan (step S31). The switching control unit 307 determines whether or not there is a newly connected vehicle 5 (step S32). Specifically, for example, the connection unit 11 acquires the identification information of the connected vehicle 5, and notifies the identification information to the EMS 30a via the switch 50, whereby the switching control unit 307 is newly connected. Vehicle 5 is detected. Alternatively, the connection unit 11 may detect that the vehicle 5 has been connected by simply detecting an electrical connection.

If there is a newly connected vehicle 5 (step S32 Yes), the EMS30a temporarily stops the current charging (step S33) and temporarily switches the switch 50 to the newly connected vehicle (step S32 Yes). Step S34). Specifically, in step S33, for example, the switching control unit 307 generates a command to the command generation unit 305 to stop charging the charger 42-1 corresponding to the newly connected vehicle 5-1. The command generation unit 305 transmits this command to the charger 42-1 via the communication unit 301. Based on the instruction, the charger 42-1 stops charging the vehicle 5-2 that has been charged up to that point. In step S34, the switching control unit 307 instructs the switching device 50-1 to switch the connection so as to connect the vehicle 5-1 to the charger 42-1, and the switching device 50-1 connects based on the instruction. Switch.

Next, the charger 42-1 acquires the SOC of the newly connected vehicle 5 (step S35). The charger 42-1 transmits the acquired SOC to the EMS 30a. The EMS 30a switches the connection destination of the charger 42 to the vehicle 5 in which charging has been suspended (step S36), and restarts charging (step S37). Specifically, in step S36, the switching control unit 307 instructs the switching device 50-1 to connect the vehicle 5-2 whose charging has been suspended to the charger 42-1. The switch 50-1 switches the connection based on the instruction. In step S36, the command generation unit 305 generates a command to resume charging of the vehicle 5-2 whose charging has been suspended, and transmits the command to the charger 42-1 via the communication unit 301. The charger 42-1 resumes charging the vehicle 5-2 based on this command.

The switching control unit 307 determines whether or not the plan needs to be changed based on the SOC of the newly connected vehicle 5 (step S38). Specifically, for example, the switching control unit 307 compares the predicted value of the SOC for each vehicle 5 as illustrated in the system charge / discharge plan or FIG. 8 with the acquired SOC, and the difference between the two is a certain value or more. If so, it is judged that the plan needs to be changed.

If No in step S32 and No in step S38, EMS30a repeats the process from step S31.

If it is determined that the plan needs to be changed (step S38 Yes), the EMS30a modifies the system charge / discharge plan (step S39) and re-executes the process from step S31. Specifically, in step S39, the switching control unit 307 instructs the plan update unit 304 to revise the plan. The modification of the system charge / discharge plan performed at this time is the same as the process when the measured value of SOC is acquired in the first embodiment. In the present embodiment, since the measured value of the SOC of the vehicle 5 may be acquired earlier than in the first embodiment, the replanning can be performed more appropriately than in the first embodiment. For example, if the SOC of the storage battery of a certain vehicle 5 is significantly lower than expected at the time of planning the next day, it is necessary to lengthen the charging time or increase the charging power of the vehicle 5. Since the EMS 30a of the present embodiment can grasp such a situation at an early stage, a replanning reflecting these can be performed before the start of charging of the vehicle 5, so that the vehicle 5 is charged according to the situation. The charger 42 can be changed efficiently.

The switch 50 detects that the vehicle 5 is connected to the connection unit 11 and transmits the SOC of the newly connected vehicle 5 in parallel without stopping the charging of another vehicle 5 via the connection unit 11. It may be acquired and transmitted to the EMS 30a. In this case, in step S32, the EMS 30a detects the connection of the new vehicle 5 by acquiring the SOC of the newly connected vehicle 5 via the connection unit 11 and the switch 50. Then, the EMS 30a executes the processes of steps S38 and S39 without executing steps S33 to S37.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1,1a, 1b Charging system, 2 power system, 3 transformer, 4 facility power system, 5-1 to 5n vehicle, 6 premises load, 10-1 to 10-n, 42-1 to 42-n charging Charger, 11-1 to 11-n, 11-1-1 to 11-n-3 connection unit, 20 storage battery, 21,43 storage battery PCS, 22 photovoltaic power generation equipment, 23 power generation measuring instrument, 30, 30a EMS, 31 Weather Forecast Center, 32 Road Traffic Center, 33 Public Line, 40 DC Bus, 41 Converter, 44, 45, 46-1 to 46-n Bus Voltage Detector, 47 DC Load, 50-1 to 50-n Switching Charger, 301 communication unit, 302 plan creation unit, 303 update judgment unit, 304 plan update unit, 305 command generation unit, 306 storage unit, 307 switching control unit.

Claims (14)

A charging plan for a plurality of chargers capable of charging the mobile storage battery of the moving body, and a charging / discharging plan for the storage battery capable of storing the power generated by the solar power generation facility and supplying the discharged power to the charger. An energy management system that creates a system charge / discharge plan that includes
A planning unit that predicts the amount of power generated by the photovoltaic power generation facility based on information indicating the weather forecast, and creates the system charge / discharge plan based on the predicted value of the amount of power generation and the operation plan of the moving body. When,
An energy management system including a plan update unit that updates the system charge / discharge plan based on information indicating an updated weather forecast. The moving body is a vehicle traveling on a road.
The planning unit further creates the system charge / discharge plan based on the information indicating the road congestion prediction, and then creates the system charge / discharge plan.
The energy management system according to claim 1, wherein the plan update unit updates the system charge / discharge plan based on information indicating an updated road congestion forecast. Based on the system charge / discharge plan, a command for charging or discharging the control device and the charger for charging / discharging the storage battery is generated, and the command is transmitted to the corresponding control device or the charger. Command generator,
The energy management system according to claim 1 or 2, wherein the energy management system comprises. The plurality of chargers and the control device are connected to a DC bus, and the plurality of chargers and the control device are connected to each other.
The command generator is based on the system charge / discharge plan for the voltage controlled target device, which is at least one of the charger and the control device, when the voltage of the DC bus deviates from the standard voltage range. The energy management system according to claim 3, wherein the generation of the command is stopped, a charge command or a discharge command for keeping the voltage within the standard voltage range is generated and transmitted to the voltage control target device. .. The plan update unit acquires the remaining amount information indicating the remaining amount of the mobile storage battery from the mobile storage battery, and updates the system charge / discharge plan based on the remaining amount information. The energy management system according to any one of items 1 to 4. A switching control unit that controls a plurality of switching devices that are connected to the plurality of chargers and connected to a plurality of connecting units that can be connected to the moving body.
With
The switch can switch the connection destination of the connected charger to any one of the plurality of connection units, via a first connection unit which is one of the plurality of connection units. While the charger is charging the first mobile body, which is the mobile body, the first mobile body is connected to a second connection unit other than the first connection unit among the plurality of connection units. When the second moving body, which is the moving body other than the above, is connected, the remaining amount of the storage battery for the moving body included in the second moving body from the second moving body via the second connecting unit. Acquire the remaining amount information indicating
The energy management system according to claim 5, wherein the plan update unit updates the system charge / discharge plan based on the remaining amount information acquired from the second mobile body by the switch. The planning unit is characterized in that the system charge / discharge plan is created so that the power obtained by subtracting the power supplied by the discharge from the storage battery from the total value of the charging power of the plurality of chargers is equal to or less than the threshold value. The energy management system according to any one of claims 1 to 6. According to any one of claims 1 to 7, the planning unit creates a charge / discharge plan for the storage battery based on the predicted value of the amount of power generation and the charge of electric power for each time zone. Described energy management system. Multiple chargers that can charge the mobile storage battery of the mobile
A storage battery that can store the power generated by the photovoltaic power generation equipment and supply the discharged power to the charger.
An energy management system that creates a system charge / discharge plan including a charge plan for the plurality of chargers and a charge / discharge plan for the storage battery.
With
The energy management system
A planning unit that predicts the amount of power generated by the photovoltaic power generation facility based on information indicating the weather forecast, and creates the system charge / discharge plan based on the predicted value of the amount of power generation and the operation plan of the moving body. When,
A plan update unit that updates the system charge / discharge plan based on the updated weather forecast information,
A charging system characterized by being equipped with. A converter that converts AC power supplied from the power system into DC power and supplies it to the DC bus.
With
The charging system according to claim 9, wherein the charger uses DC power supplied from the DC bus to charge the mobile body. A control device that charges and discharges the storage battery,
With
The charging system according to claim 10, wherein the control device charges the storage battery using the DC power supplied from the DC bus, and supplies the power discharged from the storage battery to the DC bus. .. A plurality of switches connected to the plurality of chargers and connected to a plurality of connection units that can be connected to the mobile body.
With
The switch can switch the connection destination of the charger to be connected to any one of the plurality of connection units, via a first connection unit which is one of the plurality of connection units. While the charger is charging the first mobile body, which is the mobile body, the first mobile body is connected to a second connection unit other than the first connection unit among the plurality of connection units. When a second mobile body other than the above mobile body is connected, the remaining amount of the storage battery for the mobile body included in the second mobile body from the second mobile body via the second connection unit. The remaining amount information obtained from the second moving body is transmitted to the energy management system.
The charging system according to any one of claims 9 to 11, wherein the energy management system updates the system charge / discharge plan based on the remaining amount information acquired from the second mobile body. .. Multiple chargers that can charge the mobile storage battery of the mobile
A storage battery that can store the power generated by the photovoltaic power generation equipment and supply the discharged power to the charger.
An energy management system that creates a system charge / discharge plan including a charge plan for the plurality of chargers and a charge / discharge plan for the storage battery.
A converter that converts AC power supplied from the power system into DC power and outputs it to the DC bus.
With
The charger is a charging system characterized in that the mobile body is charged by using DC power supplied from the DC bus. A charging plan for a plurality of chargers capable of charging the mobile storage battery of the moving body, and a charging / discharging plan for the storage battery capable of storing the power generated by the photovoltaic power generation facility and supplying the discharged power to the charger. It is a charge / discharge management method in an energy management system that creates a system charge / discharge plan including and.
A plan creation step in which the amount of power generated by the photovoltaic power generation facility is predicted based on information indicating a weather forecast, and the system charge / discharge plan is created based on the predicted value of the amount of power generation and the operation plan of the moving body. When,
A plan update step that updates the system charge / discharge plan based on the updated weather forecast information, and
A charge / discharge management method comprising.

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