KR-20260064059-A - APPARATUS AND METHOD FOR CONTROLLING CHARGING ANS DISCHARGING BASED ON SOC OF BATTERY

KR20260064059AKR 20260064059 AKR20260064059 AKR 20260064059AKR-20260064059-A

Abstract

The present invention relates to a battery SOC-based charge/discharge control device and method, comprising a communication unit that receives electric vehicle data from an electric vehicle and receives data from one of a plurality of charge/discharge devices, and a processor that recognizes the electric vehicle and the charge/discharge device to set a charging method for the electric vehicle, either simple charging or smart charging/discharging, sets a charging/discharging schedule for the battery of the electric vehicle during smart charging/discharging, and controls the charge/discharge device based on the charging/discharging schedule so that the battery SOC of the electric vehicle reaches a target SOC. By setting a schedule for charging the electric vehicle and redistributing continuous charging time into discrete charging time, the power supply and demand balance can be effectively adjusted, charging fees can be controlled, and the power quality status can be effectively managed, thereby improving charging convenience and economic efficiency.

Inventors

김상옥
박기준
장동식
서동완

Assignees

한국전력공사

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (17)

A communication unit that receives electric vehicle data from an electric vehicle and receives data from one of a plurality of charging and discharging units; and A battery SOC-based charge/discharge control device comprising: a processor that recognizes the electric vehicle and the charge/discharger, sets a charging method for the electric vehicle such that it is either simple charging or smart charging/discharging, sets a charge/discharge schedule for the battery of the electric vehicle when smart charging/discharging is selected, and controls the charge/discharger based on the charge/discharge schedule so that the battery SOC of the electric vehicle reaches a target SOC.
In Article 1, A battery SOC-based charge/discharge control device characterized by the communication unit receiving electric vehicle data and data regarding the battery SOC of the electric vehicle from a communication terminal installed in the electric vehicle.
In Article 1, A battery SOC-based charge/discharge control device characterized by the above processor adjusting the charge/discharge schedule such that the total charge until the battery of the electric vehicle is fully charged is minimized based on the above target SOC.
In Paragraph 3, A battery SOC-based charge/discharge control device characterized by the above processor controlling the charge/discharger by generating a charge pause signal during peak power rate hours and a charge signal during other hours based on the hourly charge unit price within the total charge time range, and generating a discharge signal in response to an external signal.
In Article 4, A battery SOC-based charge/discharge control device characterized by the processor generating a charge termination signal and controlling the charge/discharger in either case where the battery SOC of the electric vehicle reaches 100% or where the total charge time (tc) is reached.
In Article 1, A battery SOC-based charge/discharge control device characterized by the processor calculating a charge characteristic value and a discharge characteristic value per unit time for the battery of the electric vehicle, calculating the required charge amount until the target SOC is reached, and setting the charge/discharge schedule.
In Article 6, A battery SOC-based charge/discharge control device characterized by the processor calculating the charge characteristic value for the battery of the electric vehicle by subtracting the initial remaining amount SOC of the first hour from the updated remaining amount SOC of the second hour and dividing by the charging time per unit time.
In Article 6, A battery SOC-based charge/discharge control device characterized by the processor calculating the discharge characteristic value for the battery of the electric vehicle by subtracting the updated remaining SOC after the second charge from the updated remaining SOC after the third discharge for the battery SOC of the electric vehicle, and dividing by the set discharge time per unit time.
In Article 6, A battery SOC-based charge/discharge control device characterized by the processor calculating the required charge amount as either the value obtained by subtracting the battery SOC after charge/discharge from the target SOC or the value obtained by subtracting the battery SOC after discharge from the target SOC.
In Article 1, A battery SOC-based charge/discharge control device characterized by the processor setting the charge/discharge schedule while considering a charge termination safety margin so that the battery SOC of the electric vehicle reaches the target SOC before reaching the total charge time.
A step in which a processor recognizes an electric vehicle and a charger/discharger based on received data; A step in which the processor sets one of simple charging and smart charging/discharging charging methods for the electric vehicle; When the smart charging and discharging is set, the processor sets a charging and discharging schedule for the battery of the electric vehicle; and A battery SOC-based charge/discharge control method comprising: a step in which the processor controls the charger/discharger based on the charge/discharge schedule so that the battery SOC of the electric vehicle reaches a target SOC.
In Article 11, In the step of controlling the above-mentioned charge/discharger, A battery SOC-based charge/discharge control method characterized by the above processor adjusting the charge/discharge schedule such that the total charge until the battery of the electric vehicle is fully charged is minimized based on the above target SOC.
In Article 12, The step of controlling the above-mentioned charge/discharger is, A step of generating a charging pause signal during peak electricity rates based on the hourly charging unit price within the total charging time range; A step of generating a charging signal during other times; and A battery SOC-based charge/discharge control method comprising the step of generating a discharge signal in response to an external signal.
In Article 11, In the step of setting the above charge/discharge schedule, A battery SOC-based charge/discharge control method characterized by the processor calculating a charge characteristic value and a discharge characteristic value per unit time for the battery of the electric vehicle, and calculating the required charge amount until the target SOC is reached to set the charge/discharge schedule.
In Article 14, In the step of setting the above charge/discharge schedule, A battery SOC-based charge/discharge control method characterized by the processor calculating the charge characteristic value for the battery of the electric vehicle by subtracting the initial remaining amount SOC of the first time from the updated remaining amount SOC of the second time and dividing by the charging time per unit time.
In Article 14, In the step of setting the above charge/discharge schedule, A battery SOC-based charge/discharge control method characterized by the processor calculating the discharge characteristic value for the battery of the electric vehicle by subtracting the updated remaining SOC after the second charge from the updated remaining SOC after the third discharge for the battery SOC of the electric vehicle, and dividing by the set discharge time per unit time.
In Article 14, In the step of setting the above charge/discharge schedule, A battery SOC-based charge/discharge control method characterized by the processor calculating the required charge amount as either the value obtained by subtracting the battery SOC after charge/discharge from the target SOC or the value obtained by subtracting the battery SOC after discharge from the target SOC.

Description

Apparatus and Method for Controlling Charging and Discharging Based on SOC of Battery The present invention relates to a battery SOC-based charge/discharge control device and a method thereof that controls charge/discharge by utilizing the battery of an electric vehicle as a resource. Generally, electric vehicles charge their batteries by continuously charging until they reach a target value. However, this poses a problem because charging demand can be concentrated in specific time periods or regions, potentially causing power load imbalances. In order to resolve this power load imbalance, it is necessary to directly control the charging of electric vehicles to distribute power consumption caused by electric vehicle charging. However, controlling the charging of an electric vehicle battery requires battery State of Charge (SOC) information and data regarding the vehicle, but there are limitations in obtaining such information. Accordingly, a method is needed to control the charging of the electric vehicle by exchanging battery status information based on communication between the electric vehicle and the charger. In addition, inverter-based distributed power sources connected to the distribution system in a reverse parallel configuration can provide grid support functions, and 'V2G electric vehicles' capable of bidirectional power transmission can be used as inverter-based distributed power sources. Accordingly, a plan is needed to control the charging and discharging of electric vehicles while utilizing them as resources to enable grid support. Korean Patent Publication No. 10-2019-0135710 (December 9, 2019) is a related background technology. FIG. 1 is a diagram illustrating a battery SOC-based charge/discharge control device and a charge/discharge system according to an embodiment of the present invention. FIG. 2 is a block diagram briefly illustrating the control configuration of a battery SOC-based charge/discharge control device according to one embodiment of the present invention. FIG. 3 is a flowchart illustrating a calculation method of a control device according to an embodiment of the present invention. FIG. 4 is an exemplary diagram illustrating an SOC-based charge/discharge mode of a control device according to one embodiment of the present invention. FIG. 5 is a flowchart illustrating a method for generating a charging schedule of a control device according to an embodiment of the present invention. FIG. 6 is a flowchart illustrating an SOC-based charging and discharging control method of a control device according to an embodiment of the present invention. FIGS. 7 and 8 are flowcharts illustrating a method for controlling an electric vehicle and a charger of a control device according to an embodiment of the present invention. The present invention will be described below with reference to the attached drawings. In this process, the thickness of lines or the size of components depicted in the drawings may be exaggerated for the sake of clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intent or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. FIG. 1 is a diagram illustrating a battery SOC-based charge/discharge control device and a charge/discharge system according to one embodiment of the present invention. As illustrated in FIG. 1, the control device (100) is connected to an electric vehicle (10) or a charger/discharger (20) to control charging and discharging. Additionally, the control device (100) can transmit data regarding charging and discharging control to a server (30) for management. A control device (100) may be included in a charging and discharging system. Additionally, the charging and discharging system may include an electric vehicle (10), a charging and discharging device (20), and a server (30). The electric vehicle (10) can be connected to a charging/discharging device (20) to charge the battery or output a discharge current from the battery. The electric vehicle (10) may include a battery, an on-board diagnostic device (OBD) (11), and a communication terminal (12). At this time, the communication terminal (12) is connected to the on-board diagnostic device (OBD) (11) via CAN communication to obtain battery SOC and time data, and can read data stored inside the vehicle and transmit it to the control device (100). The communication terminal (12) may be installed separately from the on-board communication device. The communication terminal (12) is a communication device with a built-in camera and microphone, and can be installed on a vehicle cluster or windshield to recognize and acquire HUD (Head Up Display) display information, user voice, etc. The communication terminal (12) can also acquire HUD display information on the vehicle cluster or windshield, us