CN-116111686-B - Power battery charging control method and system based on optimal cost

CN116111686BCN 116111686 BCN116111686 BCN 116111686BCN-116111686-B

Abstract

The invention provides a power battery charging control method and system based on optimal cost, and relates to the technical field of power battery charging, and the specific scheme comprises the steps of obtaining an expected charging time period set by a user and obtaining expected charging time length; the method comprises the steps of obtaining a power grid time-sharing electricity price, obtaining electricity prices of different time periods based on expected charging time periods, obtaining charging electric energy needed by a power battery, obtaining charging time periods and charging electric energy of different time periods based on a charging electric energy curve of the power battery, selecting an optimal charging time period based on the electricity prices and the charging electric energy of different time periods with optimal charging cost as a target, and automatically outputting a charger relay control signal.

Inventors

CHENG JING
WANG ZHICHAO
LI ZHIHU
CHEN HENG
XU CAIXIA

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230210

Claims (9)

1. The power battery charging control method based on the optimal cost is characterized by comprising the following steps of: acquiring an expected charging time period set by a user, and obtaining an expected charging time period; Acquiring the time-sharing electricity price of a power grid, and acquiring the electricity price of different time periods based on the expected charging time period; Acquiring charging electric energy required by a power battery, and acquiring charging time length and charging electric energy in different time periods which are actually required based on a charging electric energy curve of the power battery; based on electricity prices and charging electric energy in different time periods, with optimal charging cost as a target, an optimal charging time period is selected, and a charger relay control signal is automatically output, specifically: when the expected charging time period is longer than the actually needed charging time period, continuously selecting a plurality of time periods in the expected charging time period, wherein the sum of the time periods of the plurality of time periods cannot be smaller than the actually needed charging time period; Calculating a charging cost based on the electricity prices and the charging electric energy corresponding to the selected time periods, wherein the product of the electricity prices of the time periods and the electric energy of the time periods is taken as the charging cost; Selecting a time period with the minimum charging cost as an optimal charging period; In the optimal charging period, the charger outputs the on signal of the relay, and other periods output the off signal of the relay.
2. The cost-optimized power battery charging control method according to claim 1, wherein the desired charging period is a charging start time and a charging end time of the charger set by a user through a wired or wireless manner.
3. The method for controlling the charging of the power battery based on the optimal cost according to claim 1 is characterized in that the method for acquiring the time-of-use electricity price of the power grid is characterized in that an electric automobile charger acquires the real-time-of-use electricity price of a region where the charger is located in a wired or wireless transmission mode.
4. The optimal power battery charging control method according to claim 1, wherein the electricity prices of different periods are obtained based on the expected charging period, specifically: taking the preset duration as a time interval, and dispersing the expected charging time period into a plurality of moments; And taking the average value of the time-sharing electricity prices of the adjacent two moments as the electricity price of the time period between the adjacent two moments to obtain the electricity price of different time periods.
5. The method for controlling the charging of the power battery based on the optimal cost of claim 1, wherein the obtaining of the charging power required by the power battery is specifically that the charger is electrically crosslinked with the power battery to obtain the remaining power value and the full charge power value of the power battery.
6. The optimal power battery charging control method according to claim 5, wherein the charging power curve based on the power battery obtains the charging time length and the charging power of different time periods actually required, specifically: calculating charging electric energy required by full charge of the power battery based on the remaining electric energy and full charge of the battery; According to a charging electric energy curve of the power battery, estimating the charging time length actually required based on the charging electric energy required by full charge of the power battery; and discretizing the actually required charging time length by taking the preset time length as a time interval to obtain the charging electric energy of different time periods.
7. The power battery charging control system based on the optimal cost is characterized by comprising an expected acquisition module, an electricity price acquisition module, an electric energy acquisition module and an optimal selection module, wherein the expected acquisition module, the electricity price acquisition module, the electric energy acquisition module and the optimal selection module are used for controlling a charging period by a charger: the expected acquisition module is configured to acquire an expected charging time period set by a user and obtain an expected charging duration; The electricity price acquisition module is configured to acquire the time-sharing electricity price of the power grid and acquire the electricity prices of different time periods based on the expected charging time period; The power acquisition module is configured to acquire charging power required by the power battery and acquire charging time length required in practice and charging power in different time periods based on a charging power curve of the power battery; The optimal selection module is configured to select an optimal charging period based on electricity prices and charging electric energy in different periods and with optimal charging cost as a target, and automatically output a charger relay control signal, specifically: when the expected charging time period is longer than the actually needed charging time period, continuously selecting a plurality of time periods in the expected charging time period, wherein the sum of the time periods of the plurality of time periods cannot be smaller than the actually needed charging time period; Calculating a charging cost based on the electricity prices and the charging electric energy corresponding to the selected time periods, wherein the product of the electricity prices of the time periods and the electric energy of the time periods is taken as the charging cost; Selecting a time period with the minimum charging cost as an optimal charging period; In the optimal charging period, the charger outputs the on signal of the relay, and other periods output the off signal of the relay.
8. An electronic device, comprising: A memory for non-transitory storage of computer readable instructions, and A processor for executing the computer-readable instructions, Wherein the computer readable instructions, when executed by the processor, perform the method of any of the preceding claims 1-6.
9. A storage medium, characterized by non-transitory storing computer-readable instructions, wherein the instructions of the method of any one of claims 1-6 are performed when the non-transitory computer-readable instructions are executed by a computer.

Description

Power battery charging control method and system based on optimal cost Technical Field The invention belongs to the technical field of power battery charging, and particularly relates to a power battery charging control method and system based on optimal cost. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The power battery is used as an energy storage or energy supply component of electric products such as electric automobiles, ships, airplanes and the like, and disordered charging of the power battery inevitably causes the problems of voltage fluctuation, harmonic waves, unbalanced supply and demand of a power supply grid and the like. For example, patent CN110443415B 'a multi-objective optimization scheduling method of electric vehicle charging stations considering dynamic electricity price strategies' and patent CN110415016A 'a charging price formulation strategy based on optimized charging and discharging strategies', are all realized by optimizing the charging price of a power supply network, macroscopically guiding the charging behavior of a user, reducing the interaction power and fluctuation thereof between the power grid and the charging stations, improving the stability of the power grid and ensuring the virtuous circle of the power grid. Therefore, the prior art is more to regulate and control the charging behavior of the power battery from the macroscopic level, the microscopic charging cost of the user is not considered, the optimal cost charging of the user level is not realized, and the prior power battery charging control device realizes plug and play charging, and the electricity prices at different moments are different, so that the charging cost is greatly dependent on the charging moment of the user, and the operations are based on manual control, and the optimal charging cost can not be realized. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides the power battery charging control method and system based on optimal cost, the optimal power battery charging cost is used as a design target based on electricity prices in different areas and different time periods, and the charging time and duration are regulated and controlled by the power battery charging device, so that the charging cost of an electric power product of a user is the lowest. To achieve the above object, one or more embodiments of the present invention provide the following technical solutions: the first aspect of the invention provides a power battery charging control method based on cost optimization; The power battery charging control method based on the optimal cost is used for controlling a charging period by a charger and comprises the following steps: acquiring an expected charging time period set by a user, and obtaining an expected charging time period; Acquiring the time-sharing electricity price of a power grid, and acquiring the electricity price of different time periods based on the expected charging time period; Acquiring charging electric energy required by a power battery, and acquiring charging time length and charging electric energy in different time periods which are actually required based on a charging electric energy curve of the power battery; based on electricity prices and charging electric energy in different time periods, the optimal charging time period is selected with optimal charging cost as a target, and a charger relay control signal is automatically output. Further, the expected charging time period is a charging start time and a charging end time of the charger set by a user through a wired or wireless mode. Further, the method for acquiring the time-sharing electricity price of the power grid comprises the steps that the electric automobile charger acquires the real-time-sharing electricity price of the area where the charger is located in a wired or wireless transmission mode. Further, the electricity prices of different periods are obtained based on the expected charging period, specifically: taking the preset duration as a time interval, and dispersing the expected charging time period into a plurality of moments; And taking the average value of the time-sharing electricity prices of the adjacent two moments as the electricity price of the time period between the adjacent two moments to obtain the electricity price of different time periods. Further, the method comprises the step of obtaining the charging electric energy required by the power battery, specifically, obtaining the battery residual electric energy value and the full charge electric energy value of the power battery by electrically crosslinking the charger and the power battery. Further, the charging electric energy curve based on the power battery obtains the charging time length and the charging electric energy of different time periods which are actually neede