KR20220163668A - Autonomous control charger and charging/discharging control method for system stabilization - Google Patents

Abstract

According to the present invention, an autonomous charging/discharging control method for performing system stabilization performs system stabilization for an electric vehicle battery in an electric vehicle charger. The method comprises the following steps of: performing settings for autonomous charging/discharging; writing a charging/discharging control schedule for a corresponding electric vehicle if the electric vehicle is connected; reflecting whether system stabilization charging/discharging control is performed from system state information to the charging/discharging control schedule; and performing charging/discharging according to the charging/discharging control schedule and recording a performing result.

Description

Autonomous control charger and charge/discharge control method performing system stabilization

The present invention relates to an autonomously controlled charger capable of using a battery of an electric vehicle for stabilization of a power system and a charge/discharge control method.

Currently, there are about 130,000 electric vehicles supplied in Korea (accumulated as of the end of 2020), and the government plans to supply 1.13 million electric vehicles by 2025 and 3 million electric vehicles by 2030, and the charging infrastructure is It is planned to expand beyond maturity.

If 500,000 electric vehicles are charged at the same time, about 3.5 GW of enormous power is required. (7 kW/unit x 500,000 electric vehicles = 3.5 GW) It requires a huge amount of power to raise the output of two dogs at the same time, which can affect power supply and demand.

If the paradigm of the above-mentioned electric vehicle battery is converted into a resource, if the charging or discharging power of the electric vehicle being charged by being connected to the charger is controlled according to the needs of the power system, the electric vehicle and the charging infrastructure can be used as a useful power resource (system stabilization). resources) can be used.

Even in the case of the prior art that somewhat actively controls the charging process of an electric vehicle battery, it simply calculates and displays the amount of charge that can be charged and the required charging time for each charging speed, and simply selects the charging speed or uses reservation setting information and electricity rate information. The charger was operated in a preset minimum cost charging method or the charging profile was determined according to electricity rate information.

This existing smart charging technology creates and controls a schedule according to the conditions of individual chargers and the DR signal of the power grid from the center, so the amount of calculation and communication increases in proportion to the number of chargers, so the speed slows down as the number of EVs increases. Since the communication cost increases rapidly in proportion to the number of controls, it is not only practical, but also cannot contribute to the stabilization of system power from the point of view of system operation.

Republic of Korea Registration No. 10-1845241

An object of the present invention is to provide a charge/discharge control method for an electric vehicle battery that can contribute to stabilization of system power.

An autonomous charge and discharge control method for performing system stabilization according to an aspect of the present invention is an autonomous charge and discharge control method performed for system stabilization of an electric vehicle battery in an electric vehicle charger,

Performing settings for autonomous charging and discharging; If the electric vehicle is connected, creating a charge/discharge control schedule for the corresponding electric vehicle; reflecting whether system stabilization charge/discharge control is performed from system state information to the charge/discharge control schedule; and performing charging and discharging according to the charging and discharging control schedule and recording the result of the charging and discharging.

Here, if the system stabilization charge/discharge control is not required, the method may further include reflecting economic optimization according to electricity price information to the charge/discharge control schedule.

Here, the setting for autonomous charge/discharge may include setting one or more conditions among frequency, voltage, and reactive power as a condition for the charger to perform system stabilization charge/discharge; and setting at least one of SoC, SoH, and allowed time as a condition for inputting the battery of the electric vehicle to system stabilization charging and discharging.

Here, when the electric vehicle is connected, the step of creating a charge/discharge control schedule for the corresponding electric vehicle may include: creating a charging schedule according to operation information of the electric vehicle; and creating a charge/discharge control schedule by applying an expected load of a system connected to the charge schedule.

Here, the step of reflecting whether or not the system stabilization charge/discharge control is performed on the charge/discharge control schedule may include determining whether system stabilization control is required from at least one of frequency, voltage, and reactive power of a connected system; and changing the charge/discharge control schedule to charge or discharge the electric vehicle according to the system stabilization control, if system stabilization control is required.

Here, the step of reflecting the economic optimization according to the power price information to the charge/discharge control schedule may include determining a time interval for charging or discharging that is economically advantageous to the user according to the power price information for charging and discharging; and changing the charge/discharge control schedule according to the determined time period for the advantageous charge or discharge.

Here, the step of performing the charging and discharging and recording the performance result may include controlling charging of the electric vehicle battery while improving charging and discharging at each time; Checking whether a target charge/discharge time or a target SoC has been reached; and when the charging/discharging target time or target SoC is reached, recording information about charging and sending the information to a higher server.

Here, in performing the system stabilization charge/discharge control, even if the frequency or voltage of the current system deviates from the dead band to a low side, with respect to the dead band, which is a frequency or voltage band assumed that the general system is stabilized, a predetermined lower reference value If it becomes smaller than that, discharge can be performed.

An autonomously controlled charger performing system stabilization according to another aspect of the present invention is an autonomously controlled charger performing autonomous charging and discharging performed for system stabilization of an electric vehicle battery,

A measurement unit for measuring the state of the connected power system; a charge/discharge control unit that performs system stabilization charge/discharge control using the battery of the connected electric vehicle; and a communication unit receiving setting information for system stabilization charge/discharge control from an upper server and transmitting a result of system stabilization charge/discharge performance.

Here, the charge/discharge controller may determine whether grid stabilization control is required from at least one of the frequency, voltage, and reactive power of the connected grid.

Here, the charge/discharge control unit may perform the system stabilization charge/discharge control when it is determined that the state of the power system requires system stabilization, and otherwise perform charge/discharge for economic optimization according to the power price information. have.

Here, the setting information for the system stabilization charge/discharge control may include one or more conditions among frequency, voltage, and reactive power.

Here, the charge/discharge control unit sets at least one of frequency, voltage, and reactive power as a condition for the charger to perform system stabilization charge and discharge, and as a condition for putting the battery of the electric vehicle into system stabilization charge and discharge. , SoC, SoH, and grant time can set one or more conditions.

Here, the charge/discharge control unit may create a charge schedule according to the driving information of the electric vehicle, and may create a charge/discharge control schedule by applying an expected load of a system connected to the charge schedule.

Here, in performing the system stabilization charge/discharge control, the charge/discharge control unit, when the frequency or voltage of the current system deviates from the dead band to a lower side with respect to the dead band, which is a frequency or voltage band assumed that the general system is stabilized. Even in this case, if it is less than a predetermined lower reference value, discharge may be performed.

When the charging and discharging control method for an electric vehicle battery according to the spirit of the present invention having the above configuration is implemented, there is an advantage in contributing to stabilization of system power, in particular, stabilization of power frequency.

More specifically, since the electric vehicle charger itself measures the input voltage and controls the charging power according to set conditions, it is possible to solve the voltage problem of the distribution line connected to the charging load.

More specifically, since the charging and discharging power is directly controlled based on the frequency information measured by the charger, there is no need for a separate operating system for control. can contribute In this way, chargers across the country operate autonomously in response to frequency changes, which can substantially contribute to improving the stability of the power system.

Since the charging and discharging control method for an electric vehicle battery according to the spirit of the present invention can complete charging by the time specified by the user of the electric vehicle, it is possible to maintain the charging power sales structure while using the parked electric vehicle and charger as an effective resource. There is an advantage to being

1 to 3 are graphs showing a charging method of an electric vehicle.
4 is a flowchart illustrating an embodiment of an autonomous charge/discharge control method according to the spirit of the present invention.
5 is a relationship diagram illustrating an example of charge and discharge control for voltage and frequency of power supply;
6 is a block diagram illustrating one embodiment of an autonomously controlling charger in accordance with the teachings of the present invention;
7 to 9 are block diagrams illustrating other embodiments of autonomously controlling chargers according to the teachings of the present invention.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are only for the purpose of distinguishing one element from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it may be understood that another component may exist in the middle. .

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms include or include are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features or numbers, It can be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

In addition, shapes and sizes of elements in the drawings may be exaggerated for clearer description.

1 to 3 are graphs showing a charging method of an electric vehicle.

Applying the V1G charge control or V2G charge and discharge control technology as shown in FIG. 2 or 3 can contribute to maintaining the voltage of the power system and stabilizing the frequency.

V1G technology is an EV battery that can only supply (charge) energy, but it can control the size of the entire power system load by adjusting the amount of power supplied, and V2G technology is capable of both charging and discharging. It can contribute to the voltage and frequency control of the power system by supplying or absorbing energy from

However, current electric vehicle battery charging works by continuously supplying a certain amount of power with the standard power of the charger or the size required by the EV and stopping when the battery is fully charged. In other words, charging the battery of an electric vehicle is currently performed only in the manner shown in FIG. 1 .

The current charger operated in the manner shown in FIG. 1 starts charging with the rated power or the power requested by the EV as soon as the EV or UAV is connected to the charger, and ends when the battery is fully charged, or at a time specified by the user. It is used as a method of charging with rated power, and the charger in the current state cannot actively control the charging power during charging according to the connected power source or the state of the power system.

In addition, the existing smart charging technology generates a schedule centrally according to the user's setting and DR signal and sends it to the charger for control, so the amount of calculation and communication increases in proportion to the number of chargers, resulting in slowdown.

The present invention proposes a method for a charger to autonomously control the charging power for an electric vehicle battery according to the state of the power grid or the operating conditions of the local distribution network, for example, a control method according to the frequency or voltage of the grid power for charging. .

The charger according to the spirit of the present invention continuously measures the frequency and voltage changes of the AC power to which the charger is connected, and autonomously controls the amount of charging power by the charger itself according to conditions set in advance by the user, electric power company, or charger operator, Charging is performed while satisfying the charging requirements of the user. Then, the charging information is recorded and the result is transmitted to the operator or power company when charging is in progress or terminated.

4 is a flowchart illustrating an embodiment of an autonomous charge/discharge control method according to the spirit of the present invention.

The illustrated autonomous charge/discharge control method includes the steps of performing settings for autonomous charge/discharge (S100); When the electric vehicle is connected (plug-in), creating a charge/discharge control schedule for the corresponding electric vehicle (S200); Determining whether or not to perform system stabilization charge/discharge control based on system state information and reflecting the result in the charge/discharge control schedule (S300); It may include performing charge/discharge according to the charge/discharge control schedule and recording the result of charge (S500).

Depending on implementation, a step of reflecting economic optimization according to power price information to the charge/discharge control schedule (S400) may be further included. The step S400 is to perform economic charging, which will be described later.

The setting for autonomous charging and discharging (S100) may include setting one or more conditions among frequency, voltage, and reactive power as conditions for the charger to perform system stabilization charging and discharging; and setting at least one of SoC, SoH, and allowed time as a condition for inputting the battery of the electric vehicle to system stabilization charging and discharging.

In the step of setting conditions for the charger, the system power conditions are mainly for system stabilization, for example, a dead band for voltage and/or frequency considered stabilized by the system, and a reference reactive power ratio requiring reactive power control. You can set values, etc.

In the step of setting conditions for the battery, the range of SoH and/or SoC of the battery that can be used for system stabilization charge/discharge is set, or per unit period (eg, 1 month, 1 year, etc.) It is possible to set the total time or total charge/discharge amount that can be input to Alternatively, the degree of state of the power system requiring system stabilization may be classified into predetermined grades, and the grade into which the battery is input may be designated. In this case, classifying the level of state of the power system and specifying the battery input level can be regarded as a system stabilization control strategy.

As shown, when the electric vehicle is connected, creating a charge/discharge control schedule for the corresponding electric vehicle (S200) includes confirming that the electric vehicle is connected to a charger (plug-in) (S220); Determining charging by checking authority for the electric vehicle (S240); and generating a charging schedule and a charge/discharge control schedule for the electric vehicle battery (S260).

If the electric vehicle is connected, creating a charge/discharge control schedule for the corresponding electric vehicle (S200) includes creating a charging schedule according to operation information of the electric vehicle; and creating a charge/discharge control schedule by applying an expected load of a system connected to the charge schedule.

The charging schedule may be generated from an electric vehicle driving plan prepared (input) in advance according to a plan/schedule for the user's work/life. For example, the charging schedule is generated to perform charging that satisfies the contents (eg, SoC) described in the conditions for the battery from the time of performing the step S220 or step S240 to the expected departure time according to the driving plan. can

The charge/discharge control schedule may include a charge and/or discharge plan for system stabilization control using the electric vehicle battery within a limit satisfying the charge schedule. To this end, it is possible to receive real-time input of frequency variation information, voltage information, and reactive power information of the connected system.

In generating the charge/discharge control schedule, the reflection of the degree (amount) of load/distributed power generation at the future time of the system is the load of the corresponding system for all or part of the entire time interval defined by the charge/discharge control schedule. / It can be performed by applying the estimate of distributed generation or by reflecting the degree of load/distributed generation in the previous section for each time-division unit time zone.

Depending on the implementation, electric vehicle users may commercially sell the power stored in the battery, and the charging schedule may also describe discharging for sale, but since it is not common, it is referred to as a charging schedule.

The step of reflecting whether or not the system stabilization charge/discharge control is performed on the charge/discharge control schedule (S300) includes determining whether system stabilization control is necessary from at least one of the frequency, voltage, and reactive power of the connected system (S340); and applying the charge/discharge control schedule to charge or discharge the electric vehicle according to the system stabilization control if system stabilization control is required (S460).

The step of reflecting the economic optimization according to the power price information to the charge/discharge control schedule (S400) can be performed when, as shown, power stabilization charge/discharge control is not required, and the power for charge and discharge According to the price information, determining a time period for charging or discharging economically advantageous to the user (440); and changing the charge/discharge control schedule according to the determined time period for the advantageous charge or discharge (460).

The step of performing the charging and discharging and recording the performance result (S500) includes controlling charging of the electric vehicle battery while improving charging and discharging at each time (S520) (S540); Checking whether a target charge/discharge time and/or a target SoC have been reached (S560); and when the charging/discharging target time and/or target SoC are reached, recording information about charging and sending the information to a higher server (S80).

In performing charging and discharging in step S540 according to the charge and discharge control schedule, V1G service or V2G service may be performed as a stabilization service for the power state of the power system according to the spirit of the present invention. In addition, frequency control stabilization for stabilizing the frequency of the power system and/or voltage control stabilization for voltage stabilization may be performed.

For example, when V1G technology is applied for frequency control, if the frequency measured from the power source used by the charger falls outside the specified frequency range and falls below 59.9 Hz, charging is stopped or charging power is reduced in proportion to the frequency or in steps of 50 %, etc., and when the frequency exceeds 60.1Hz, charging can be started or charging by increasing the charging power in proportion to the frequency, thereby contributing to stabilizing the supply and demand of the entire power grid.

Alternatively, when V2G technology is applied for frequency control, if the frequency measured from the power source used by the charger falls outside the specified frequency range and falls below 59.9 Hz, the size of the charging current is reduced according to the setting and controlled in the direction of discharging if necessary. However, if the frequency exceeds 60.1 Hz, the charging current can be controlled to increase, contributing to the stability of the supply and demand of the entire power grid.

In addition, when the frequency rapidly increases in the middle of discharging, it is immediately converted to charging and may absorb power from the power system. That is, the charging and discharging can be changed immediately according to the increase or decrease of the frequency.

Or, in the case of voltage control, if the voltage measured from the connected power source goes out of the specified voltage range or the set voltage range and falls below 210V, charging is stopped, charging power is reduced in proportion or by 50%, or discharging is started to maintain the voltage. When it exceeds 230V, it starts charging or increases the charging power. Alternatively, the charging power may be varied in proportion to the voltage to contribute to securing voltage stability of the distribution line. Here, the charge/discharge power is content related to active power.

In the case of a charger capable of reactive power control or power factor control, when the voltage measured from the power source is out of the specified voltage range, it operates in the direction of supplying or absorbing reactive power to maintain the system voltage within the specified voltage, contributing to stabilization of the system voltage. can

However, unlike batteries of general ESS, the main purpose of electric vehicle batteries is to support the necessary operation of electric vehicles, and system stabilization is a secondary purpose. Therefore, if the system stabilization control using the electric vehicle battery is applied in the same way as in the case of a general ESS, it may adversely affect the operation of the electric vehicle. Hereinafter, the overall operation principle of charge/discharge control for system stabilization suitable for a battery of an electric vehicle will be described.

5 is a relationship diagram illustrating an example of charging and discharging control for voltage and frequency of a power source.

The illustrated dead band is a frequency/voltage band assuming that the general system is stabilized. In the case of ESS batteries, charging is performed when the dead band is out of the high side, and discharging is performed when the dead band is out of the low side.

In the case of system stabilization control using an electric vehicle battery proposed by the present invention, charging is performed when the ESS battery is out of the dead band to the high side, similar to the case of the ESS.

On the other hand, even when the dead band is out of the lower range, charging is maintained according to a plan (schedule) with a small amount if it is greater than a predetermined lower reference value (R), and discharge is performed if it is smaller than the lower reference value (R). Similarly, it is possible to maintain charging according to a plan (schedule) in dead band. That is, the lower reference value R may be set to a lower value than the lower boundary value of the dead band.

Next, a 'autonomous control charger' according to the spirit of the present invention will be looked at.

The 'self-controlling charger' according to the idea of the present invention continuously measures the frequency and voltage changes in the AC power to which the charger is connected, and according to the charging control rules or algorithms set in advance by the user, the electric power company, or the charger operator, the charger itself can charge an electric vehicle or It autonomously controls and records the amount of charging or discharging power supplied to the electric vehicle.

The charger continuously records changes in the amount of charging power, and calculates the controlled charging power amount and control time in preparation for the rated charging power in the absence of autonomous control. settle the compensation

Depending on the priority set by the charger user (electric vehicle charging customer), the charger performs rated charging, economic charging, or automatically controlled autonomous charging and discharging.

- Rated charging: continuous charging with standard power

- Economic charging: charging control to minimize the charging fee

- Controlled charging: Starts with rated charging or economical charging, and receives control commands from the charger operator or DSO to control charging and charging

- Autonomous charging: Starts charging with economic charging, and automatically controls charging and discharging according to preset conditions by inputting voltage and frequency.

When automatic control type charging is selected, the charger performs charging by controlling the size of the charging power or discharging power according to the frequency information and voltage information obtained from the power line to which the charger is connected according to the control conditions set by the electric power company or the charger operator or the DR rate. can

6 is a block diagram illustrating one embodiment of an autonomously controlling charger in accordance with the teachings of the present invention.

The autonomously controlled charger 200 performing autonomous charging and discharging for system stabilization of the illustrated electric vehicle battery includes a measuring unit 210 that measures the state of a connected power system; a charge/discharge controller 240 that performs system stabilization charge/discharge control using the battery of the connected electric vehicle; and a communication unit 260 receiving setting information for system stabilization charge/discharge control from an upper server and transmitting a result of system stabilization charge/discharge performance.

Depending on the implementation, the communication unit 260 may receive power price information from an upper server in order to control charging and discharging for economic optimization.

Depending on the implementation, the communication unit 260 may receive the setting information or power price information at a predefined communication time and record it in the internal storage unit of the autonomously controlled charger 200 without being always kept online. .

The charge/discharge controller 240 may perform an autonomous charge/discharge control method according to the spirit of the present invention.

For example, the charge/discharge control unit 240 determines whether system stabilization control is required from at least one of the frequency, voltage, and reactive power of the connected system, and when it is determined that the system stabilization is necessary, the system stabilization Charge/discharge control may be performed, and otherwise, charge/discharge may be performed for economic optimization according to the power price information.

For example, the charge/discharge control unit 240 determines one or more of frequency, voltage, and reactive power as a condition for the charger to perform system stabilization charge and discharge according to setting information from a higher server received from the communication unit 260. As a condition setting and/or condition for inputting the battery of the electric vehicle to system stabilization charging/discharging, one or more conditions setting among SoC, SoH, and allowed time may be performed.

Depending on the implementation, the charge/discharge control unit 240 creates a charging schedule according to the driving information of the electric vehicle, applies the expected load of the system connected to the charging schedule to create a charge/discharge control schedule, and creates a charge/discharge control schedule. The electric vehicle battery may be charged and discharged according to a control schedule.

As shown, the measuring unit 210 can continuously measure the power frequency and voltage from the connected power source.

The charge/discharge controller 240 may control charging or discharging power by comparing the voltage and frequency measured by the measurement unit 210 with preset values.

Depending on the implementation, the illustrated autonomously controlled charger 200 may further include user interface units 280 and 290 that receive user settings and display a charging progress state.

Alternatively, the electric vehicle may further include a charging vehicle control unit 120 generating a charge or discharge control signal through CP/PWM control, CAN, PLC communication, or the like.

In addition, in the case of DC charging, a power converter (not shown) may be further included, and a power meter 140 for recording charging power according to time may be further included.

Next, the connection configuration and functional flow between the illustrated charger, electric vehicle, and upper server will be described in detail.

As the charge/discharge method, a method of SAE J1772, IEC61851, ISO15118 standards or any DC or AC charge/discharge method may be applied.

The operator system 600 transmits set values such as a frequency range and a voltage range for executing charging control or discharging control to the charger at regular intervals, and the charger 200 transmits the charging and discharging power amount and the controlled power and power amount during charging and discharging. , time, etc. are recorded and transmitted to the operator system (600).

The operator calculates the usage fee and incentive based on the charging and control data received from the charger 200 .

The operator system 600 receives information on frequency and voltage set values for charging and discharging control from the power grid operating system 700 such as a distribution network operator (DSO) or a power system operator (ISO), and autonomous control information for individual chargers. generate

The operator system 600 has information on the amount of charge and charge control amount obtained from the charger for each hour, and calculates the charge control compensation money, charge rate or discharge compensation money, and transmits it to the metering information and billing system 800 .

In some cases, the charger 200 may directly receive control information from a distribution network operator (DSO) or an power system operator (ISO) 700 .

A process in which the charger 200 having the configuration of FIG. 6 performs the autonomous charge/discharge control method according to the flowchart of FIG. 4 is as follows.

The charger 200 periodically receives a voltage range for charge and discharge control, a control value for the voltage, and a control value for the frequency range and frequency from the electric power company or charger operator, and sets automatic control conditions (S100). At this time, the charger 200 may be set to autonomous charging, controlled charging, economic charging, and rated charging according to the selection of the user of the connected electric vehicle.

For charging, the user may input kWh, mileage, or battery charge amount (State of Charge, hereinafter SoC) as a charging value in the electric vehicle connection step (S220) of FIG. 4 and input the vehicle departure time or charging end time.

The charger 200 continuously measures the voltage and frequency of the power source, and when the voltage or frequency reaches the set range (S340), the size of the charging power or discharging power can be reduced or raised in multi-step or proportional control according to the control setting. Yes (S360, S540).

The charger 200 accumulates the amount of electric power charged or discharged by time and continues or stops the charging or discharging control so that charging can be completed until the vehicle leaving time or the charging end time (S560). If, in the case of an electric transportation means capable of discharging, the power supply voltage and frequency may be measured, and when the set range is reached, the discharging may be controlled according to the control setting.

The above-described charging and discharging processes can be applied to AC and DC charging and V2G charging and discharging.

7 to 9 are block diagrams illustrating other embodiments of an autonomously controlling charger according to the teachings of the present invention.

The autonomously controlled charger of FIG. 7 corresponds to an implementation in which settings for system stabilization charge/discharge control are performed in a home EMS server or a building EMS server.

The autonomously controlled charger 200 of FIG. 7 is a voltage range and control for charge and discharge control from a charging infrastructure charging infrastructure operating system, a distribution system operator (DSO) or an independent system operator (ISO). Without receiving the input of the frequency range in which the strategy and charge-discharge are controlled, it can autonomously operate independently by controlling the reactive power and active power within the power capacity range of the charger according to the voltage and frequency range settings set by the user or the xEMS of the building or house. can

Alternatively, in the case of a microgrid or a single system, the frequency and voltage setting range can be input from the EMS of the single system or the user's initial setting value can be input to autonomously operate independently within the charger's capacity range.

The autonomously controlled charger of FIG. 8 is based on an implementation that performs system stabilization charge/discharge control in conjunction with a user's smartphone in a charging infrastructure operating system.

The autonomously controlled charger of FIG. 9 is based on an implementation in which a home EMS server or a building EMS server performs system stabilization charge/discharge control in conjunction with a user's smartphone.

The charger 201 of FIG. 8 or 9 is configured to operate and display a charger as an app of a smartphone without having a user manipulation unit display device on the main body.

For example, it is possible to configure the charger 201 that operates completely autonomously by automatically receiving set values for charging requirements such as vehicle departure time, charging end time, charging amount, and dischargeable amount from the electric vehicle without input of a charging target value by the user. have.

Those skilled in the art to which the present invention pertains should understand that the embodiments described above are illustrative in all respects and not limiting, since the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. only do The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

200: autonomously controlled charger
210: measurement unit
240: charge and discharge control unit
260: communication department
280, 290: user interface unit
120: charging vehicle control unit
140: power metering unit
600: operator system
700: system operation system
800: metering information and billing system
900: microgrid, xEMS
1000: user operation / display device

Claims (15)

In the autonomous charge and discharge control method performed for system stabilization of an electric vehicle battery in an electric vehicle charger,
Performing settings for autonomous charging and discharging;
If the electric vehicle is connected, creating a charge/discharge control schedule for the corresponding electric vehicle;
reflecting whether system stabilization charge/discharge control is performed from system state information to the charge/discharge control schedule; and
Performing charge and discharge according to the charge and discharge control schedule and recording the result of the charge and discharge
Autonomous charge and discharge control method comprising a.
According to claim 1,
If the system stabilization charge/discharge control is not required, reflecting economic optimization according to electricity price information to the charge/discharge control schedule
Autonomous charge and discharge control method further comprising a.
According to claim 1,
The step of performing the setting for the autonomous charge and discharge,
setting at least one of frequency, voltage, and reactive power as a condition for the charger to perform system stabilization charge and discharge; and
Setting one or more conditions among SoC, SoH, and allowed time as a condition for inputting the battery of the electric vehicle to system stabilization charging and discharging.
Autonomous charge and discharge control method comprising a.
According to claim 1,
When the electric vehicle is connected, the step of creating a charge/discharge control schedule for the corresponding electric vehicle,
creating a charging schedule according to driving information of the electric vehicle; and
Creating a charge/discharge control schedule by applying the expected load of the system connected to the charge schedule
Autonomous charge and discharge control method comprising a.
According to claim 1,
In the step of reflecting whether the system stabilization charge/discharge control is performed on the charge/discharge control schedule,
Determining whether grid stabilization control is required from at least one of frequency, voltage, and reactive power of the connected grid; and
If system stabilization control is required, changing the charge/discharge control schedule to charge or discharge the electric vehicle according to system stabilization control.
Autonomous charge and discharge control method comprising a.
According to claim 2,
In the step of reflecting economic optimization according to the electricity price information to the charge/discharge control schedule,
determining a time interval for charging or discharging that is economically advantageous to a user according to the electricity price information for charging and discharging; and
Changing the charge/discharge control schedule according to the determined time interval for the favorable charge or discharge.
Autonomous charge and discharge control method comprising a.
According to claim 1,
The step of performing the charging and discharging and recording the performance result,
controlling charging of the electric vehicle battery while improving charging and discharging at each time;
Checking whether a target charge/discharge time or a target SoC has been reached; and
When the charging/discharging target time or target SoC is reached, recording information about charging and sending it to a higher server
Autonomous charge and discharge control method comprising a.
According to claim 1,
In performing the system stabilization charge and discharge control,
Regarding the dead band, which is the frequency or voltage band assumed that the general system is stabilized, even if the frequency or voltage of the current system is out of the dead band to the low side, discharge is performed when it is smaller than a predetermined lower reference value. Autonomous charge and discharge control method.
As an autonomously controlled charger that performs autonomous charging and discharging for system stabilization of an electric vehicle battery,
A measurement unit for measuring the state of the connected power system;
a charge/discharge control unit that performs system stabilization charge/discharge control using the battery of the connected electric vehicle; and
Communication unit that receives setting information for system stabilization charge/discharge control from the upper server and transmits the result of system stabilization charge/discharge performance
An autonomously controlled charger comprising a.
According to claim 9,
The charge and discharge control unit,
An autonomously controlled charger that determines whether grid stabilization control is required from at least one of the connected grid's frequency, voltage, and reactive power.
According to claim 10,
The charge and discharge control unit,
If it is determined that the state of the power system requires system stabilization, the system stabilization charge and discharge control is performed, and otherwise, the autonomously controlled charger performs charge and discharge for economic optimization according to the power price information.
According to claim 9,
The setting information for the system stabilization charge and discharge control,
An autonomously controlled charger that includes one or more of the following conditions: frequency, voltage, or reactive power.
According to claim 9,
The charge and discharge control unit,
As a condition for the charger to perform grid stabilization charging and discharging, one or more conditions among frequency, voltage, and reactive power are set, and as a condition for putting the battery of the electric vehicle into grid stabilization charging and discharging, among SoC, SoH, and allowed time An autonomously controlled charger that sets one or more conditions.
According to claim 9,
The charge and discharge control unit,
Creating a charging schedule according to the driving information of the electric vehicle;
An autonomously controlled charger that creates a charge/discharge control schedule by applying an expected load of a system connected to the charge schedule.
According to claim 9,
The charge and discharge control unit,
In performing the system stabilization charge and discharge control,
Regarding the dead band, which is the frequency or voltage band assumed that the general system is stabilized, even if the frequency or voltage of the current system is out of the dead band to the low side, it is an autonomously controlled charger that discharges when it is less than a predetermined lower reference value.

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