Power distribution method and device of energy storage system, equipment and medium

Abstract

The invention discloses a power distribution method and device for an energy storage system, equipment and a medium, and belongs to the technical field of energy storage. The method comprises the following steps: acquiring battery cell voltage and battery cell temperature of each single battery cell in all energy storage units; under the condition that the battery cell temperature meets a preset temperature factor condition, determining a double-factor power distribution coefficient of each energy storage unit based on a charging and discharging instruction issued by dispatching and battery cell voltages, battery cell temperatures, voltage regulation parameters and temperature regulation parameters of all single battery cells in the energy storage system; and distributing power contained in the charging and discharging instruction to each energy storage unit according to the two-factor power distribution coefficient. According to the embodiment of the invention, the response duration of the energy storage system in response to power scheduling can be improved.

Description

Technical Field

[0001] This application belongs to the technical field of energy storage, and particularly relates to a power distribution method, device, equipment and medium for an energy storage system. Background Art

[0002] With the continuous development of energy storage technology, the application scenarios of energy storage systems have also been continuously expanded. For example, energy storage systems can participate in power system dispatching and response, and the requirements of the power system for the connection of energy storage systems to the power grid are also getting higher and higher. An energy storage system often includes multiple energy storage units. When the energy storage system participates in power system dispatching and response, the power issued needs to be distributed to each energy storage unit. In order to make the state of charge (SOC) of each energy storage unit in the energy storage system consistent during the full charge stage or full discharge stage, the power is distributed according to the high and low SOC of each energy storage unit during the charging or discharging process.

[0003] However, the SOC of each energy storage unit is calculated by the ampere-hour integration method. During the long-term operation of the energy storage system, the SOC of the energy storage unit will have a cumulative error, and the calculated SOC cannot accurately represent the current remaining power of the energy storage unit. When the calculated SOCs of each energy storage unit are the same, the charge and discharge responses of different energy storage units will be inconsistent, thereby reducing the response duration of the energy storage system to respond to power dispatching. Summary of the Invention

[0004] The embodiments of this application provide a power distribution method, device, equipment and medium for an energy storage system, which can improve the response duration of the energy storage system to respond to power dispatching.

[0005] In a first aspect, the embodiments of this application provide a power distribution method for an energy storage system. The energy storage system includes multiple energy storage units, and each energy storage unit includes multiple single cells. The method includes: obtaining the cell voltage and cell temperature of each single cell in all energy storage units; when the cell temperature meets the preset temperature factor condition, determining the two-factor power distribution coefficient of each energy storage unit based on the charge and discharge instruction issued by the dispatching and the cell voltage, cell temperature, voltage adjustment parameter and temperature adjustment parameter of all single cells in the energy storage system; and distributing the power included in the charge and discharge instruction to each energy storage unit according to the two-factor power distribution coefficient.

[0006] In some possible embodiments, determining the two-factor power distribution coefficient of each energy storage unit based on the charge and discharge instructions issued by scheduling and the cell voltages, cell temperatures, voltage adjustment parameters, and temperature adjustment parameters of all individual cells in the energy storage system includes: obtaining the voltage extreme values of the cell voltages of all individual cells in each energy storage unit, and the temperature extreme values of the cell temperatures of all individual cells in each energy storage unit; obtaining the two-factor voltage allocation value of each energy storage unit based on the voltage extreme value, voltage adjustment parameter, and preset cell voltage cut-off value of each energy storage unit; obtaining the two-factor temperature allocation value of each energy storage unit based on the temperature extreme value and temperature adjustment parameter of each energy storage unit; and obtaining the two-factor power distribution coefficient of each energy storage unit according to the two-factor voltage allocation value and the two-factor temperature allocation value.

[0007] In some possible embodiments, the method further includes: when the cell temperature does not meet the temperature factor condition, obtaining the single-factor power distribution coefficient of each energy storage unit based on the charge and discharge instructions issued by scheduling and the cell voltages and voltage adjustment parameters of all individual cells in the energy storage system, or based on the cell voltages of all individual cells in the energy storage system; and allocating the power included in the charge and discharge instructions to each energy storage unit according to the single-factor power distribution coefficient.

[0008] In some possible embodiments, obtaining the single-factor power distribution coefficient of each energy storage unit based on the charge and discharge instructions issued by scheduling and the cell voltages and voltage adjustment parameters of all individual cells in the energy storage system, or based on the cell voltages of all individual cells in the energy storage system, includes: obtaining the voltage extreme values of the cell voltages of all individual cells in each energy storage unit; obtaining the single-factor voltage allocation value of each energy storage unit based on the voltage extreme value, voltage adjustment parameter, and preset cell voltage cut-off value of each energy storage unit, or based on the voltage extreme value and cell voltage cut-off value of each energy storage unit; and obtaining the single-factor power distribution coefficient of each energy storage unit according to the single-factor voltage allocation value.

[0009] In some possible embodiments, when the charge and discharge instruction represents charging, the voltage extreme value includes the voltage maximum value; when the charge and discharge instruction represents discharging, the voltage extreme value includes the voltage minimum value.

[0010] In some possible embodiments, when the maximum value of the cell temperatures of all individual cells in the energy storage system is greater than the temperature correction upper threshold, the temperature extreme value includes the temperature maximum value; when the minimum value of the cell temperatures of all individual cells in the energy storage system is less than the temperature correction lower threshold, the temperature extreme value includes the temperature minimum value.

[0011] In some possible embodiments, the temperature factor conditions include: the maximum value of the cell temperatures of all the individual cells in the energy storage system is greater than the temperature correction upper limit threshold, or the minimum value of the cell temperatures of all the individual cells in the energy storage system is less than the temperature correction lower limit threshold.

[0012] In a second aspect, an embodiment of the present application provides a power distribution device for an energy storage system. The energy storage system includes a plurality of energy storage units, and each energy storage unit includes a plurality of individual cells. The device includes: a data acquisition module configured to acquire the cell voltages and cell temperatures of the individual cells in all the energy storage units; a coefficient determination module configured to, when the cell temperatures meet the preset temperature factor conditions, determine the two-factor power distribution coefficients of the energy storage units based on the charge and discharge instructions issued by the scheduling and the cell voltages, cell temperatures, voltage adjustment parameters, and temperature adjustment parameters of all the individual cells in the energy storage system; and a power distribution module configured to distribute the power included in the charge and discharge instructions to the energy storage units according to the two-factor power distribution coefficients.

[0013] In a third aspect, an embodiment of the present application provides an energy management device applied to an energy management system. The device includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the power distribution method of the energy storage system in the first aspect is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the power distribution method of the energy storage system in the first aspect is implemented.

[0015] The embodiment of the present application provides a power distribution method, device, equipment, and medium for an energy storage system. When the cell temperatures of the individual cells in the energy storage system meet the temperature factor conditions, it can be determined that the temperature factor in the energy storage system has a greater impact on the charge and discharge responses of the energy storage units, and the charge and discharge responses of the energy storage units are restricted by the cell voltages of the individual cells. According to the cell voltages, cell temperatures, voltage adjustment parameters, and temperature adjustment parameters, the two-factor power distribution coefficients of the energy storage units are determined. Both the cell voltages and cell temperatures are accurate parameters obtained by measurement. Distributing the power to be scheduled to the energy storage units according to the two-factor power distribution coefficients obtained by comprehensively considering the temperature factor and the voltage factor can reduce the differences in the cell voltages and cell temperatures of the energy storage units, improve the consistency of the charge and discharge responses of the energy storage units, and thus improve the response duration of the energy storage system to power scheduling. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a flowchart of the power distribution method for the energy storage system provided by an embodiment of the present application;

[0018] Figure 2 It is a comparison diagram of the effects of an example of two methods provided by the embodiments of the present application;

[0019] Figure 3 It is a flowchart of the power distribution method for the energy storage system provided by another embodiment of the present application;

[0020] Figure 4 It is a flowchart of the power distribution method for the energy storage system provided by still another embodiment of the present application;

[0021] Figure 5 It is a flowchart of the power distribution method for the energy storage system provided by yet another embodiment of the present application;

[0022] Figure 6 It is a schematic structural diagram of the power distribution device for the energy storage system provided by an embodiment of the present application;

[0023] Figure 7 It is a schematic structural diagram of the energy management device provided by an embodiment of the present application. Detailed implementation manners

[0024] The following will describe in detail the features and exemplary embodiments of various aspects of the present application. To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the following further describes the present application in detail in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than limiting the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0025] With the continuous development of energy storage technologies, the application scenarios of energy storage systems have also been continuously expanding. For example, energy storage systems can participate in power system dispatching and response, and the requirements of the power system for the connection of energy storage systems to the grid are also getting higher and higher. An energy storage system often includes multiple energy storage units. When the energy storage system participates in power system dispatching and response, the allocated power needs to be distributed to each energy storage unit. In order to make the state of charge (SOC) of each energy storage unit in the energy storage system consistent during the full charge or full discharge stage, during the charging or discharging process, the power is distributed according to the high or low SOC of each energy storage unit. For example, during the charging process, relatively higher power is allocated to the energy storage unit with a relatively lower SOC, and relatively lower power is allocated to the energy storage unit with a relatively higher SOC; during the discharging process, relatively lower power is allocated to the energy storage unit with a relatively lower SOC, and relatively higher power is allocated to the energy storage unit with a relatively higher SOC, so as to achieve the consistency of the SOC of each energy storage unit. However, the SOC of each energy storage unit is calculated by the ampere-hour integration method. During the long-term operation of the energy storage system, there will be a cumulative error in the SOC of the energy storage unit, and the calculated SOC cannot accurately represent the current remaining power of the energy storage unit. Moreover, there are differences in the characteristics of the single cells in each energy storage unit, and the charge and discharge responses of each energy storage unit will be affected by the characteristics of the single cells in each energy storage unit. Therefore, when the calculated SOC of each energy storage unit is consistent, there will be a situation where the charge and discharge responses of different energy storage units are inconsistent, thus reducing the response duration of the energy storage system to respond to power dispatching.

[0026] For the convenience of understanding, a brief description of the energy storage system is given here first. The energy storage system includes multiple energy storage units, and each energy storage unit includes multiple single cells. The multiple single cells can be connected in series, in parallel, or in a series-parallel hybrid connection. The energy storage unit may also include an inverter, which can be used for energy conversion. In some examples, the inverter can be implemented as a power conversion system (PCS). Each energy storage unit can be configured with a control unit, which can collect the basic data of each single cell in the corresponding energy storage unit and upload the basic data to the energy management system (EMS). The energy management system can cooperate with the inverter to execute the charge and discharge strategy of the energy storage system, control the charge and discharge of the energy storage system, and improve the energy utilization rate.

[0027] The present application provides a power distribution method, device, equipment and medium for an energy storage system, which can use the cell voltage and cell temperature of each single cell in the energy storage unit as the basis for power distribution in the energy storage system. The charge and discharge response of the energy storage unit is restricted by the cell voltage of the single cell in the energy storage unit, and too high or too low cell temperature will also affect the charge and discharge response. Both the cell voltage and the cell temperature are accurate parameters obtained by measurement. By allocating power to each energy storage unit in the energy storage system according to the cell voltage and the cell temperature, the consistency of the charge and discharge response of each energy storage unit can be improved, thereby increasing the response duration of the energy storage system to respond to power scheduling.

[0028] The power distribution method, device, equipment and medium provided by the present application will be described separately below.

[0029] The present application provides a power distribution method for an energy storage system, which can be applied to scenarios where power is distributed to the energy storage system during the charging process or the discharging process. The power distribution method of the energy storage system can be executed by a power distribution device, an energy management device, an energy management system, etc. of the energy storage system, which is not limited herein. Figure 1 For the flowchart of the power distribution method of the energy storage system provided by an embodiment of the present application, as Figure 1 shown, the power distribution method of the energy storage system may include steps S101 to S103.

[0030] In step S101, the cell voltage and cell temperature of each single cell in all energy storage units are obtained.

[0031] The control unit corresponding to the energy storage unit can collect the cell voltage and cell temperature of each single cell in the energy storage unit, and upload the cell voltage and cell temperature of each single cell to the energy management system, so that the energy management system can allocate power to each energy storage unit in the energy storage system based on the cell voltage and cell temperature of each single cell in the energy storage unit. Among them, the cell voltage and the cell temperature are measured values, with higher accuracy.

[0032] In step S102, when the cell temperature meets the preset temperature factor condition, based on the charge and discharge instructions issued by the scheduling and the cell voltage, cell temperature, voltage adjustment parameter and temperature adjustment parameter of all single cells in the energy storage system, determine the two-factor power distribution coefficient of each energy storage unit.

[0033] The temperature factor condition is used to determine whether the cell temperature will affect the charge and discharge response of the energy storage unit. If the cell temperature meets the temperature factor condition, it means that the cell temperature will have a greater impact on the charge and discharge response of the energy storage unit. The temperature factor condition can be determined according to scenarios, requirements, experience, etc. For example, the temperature factor condition may include that the maximum value of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper limit threshold, or the minimum value of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower limit threshold. The maximum value of the cell temperatures of all single cells in the energy storage system being greater than the temperature correction upper limit threshold can indicate that the cell temperature in the energy storage system is too high, and this too high cell temperature will have a greater impact on the charge and discharge response of the energy storage unit. The minimum value of the cell temperatures of all single cells in the energy storage system being less than the temperature correction lower limit threshold can indicate that the cell temperature in the energy storage system is too low, and this too low cell temperature will have a greater impact on the charge and discharge response of the energy storage unit. The temperature correction upper limit threshold and the temperature correction lower limit threshold can be set according to scenarios, requirements, experience, etc., and are not limited here. For example, the temperature correction upper limit threshold is 35°C, and the temperature correction lower limit threshold is 20°C. Correspondingly, under the condition that the cell temperature meets the temperature factor condition, it is necessary to comprehensively consider the two factors of cell voltage and cell temperature to jointly determine the power distribution coefficient of each energy storage unit, that is, the two-factor power distribution coefficient. The two-factor power distribution coefficient is the power distribution coefficient that comprehensively refers to the two factors of cell voltage and cell temperature.

[0034] The charge and discharge instructions issued by the dispatching can be sent by the dispatching party system. The dispatching party system is the control system of the power dispatching party. For example, if the energy storage system participates in the power grid dispatching, the power dispatching party is the power grid, and the power dispatching party system is the power grid system. The charge and discharge instructions include the power that needs to be dispatched by the energy storage system, and the charge and discharge instructions can also characterize charging or discharging. In the case where the charge and discharge instructions characterize charging, the power included in the charge and discharge instructions is the charging power to be dispatched; in the case where the charge and discharge instructions characterize discharging, the power included in the charge and discharge instructions is the discharging power to be dispatched.

[0035] The voltage regulation parameter can be used to balance the weight of the voltage factor in power distribution, and its specific value can be set according to scenarios, requirements, experience, etc. The temperature regulation parameter can be used to balance the weight of the temperature factor in power distribution, and its specific value can be set according to scenarios, requirements, experience, etc. In some examples, the voltage regulation parameter can be a parameter with the same unit as the cell voltage. For example, the unit of the voltage regulation parameter can be volts (V), such as the voltage regulation parameter can be greater than or equal to 5V; the temperature regulation parameter can be a parameter with the same unit as the cell temperature. For example, the unit of the temperature regulation parameter can be degrees Celsius (°C), such as the temperature regulation parameter can be greater than or equal to 5°C. In other examples, the voltage regulation parameter and the temperature regulation parameter can be dimensionless weight coefficients. For example, both the voltage regulation parameter and the temperature regulation parameter are less than 1, and the sum of the voltage regulation parameter and the temperature regulation parameter is 1.

[0036] In step S103, the power included in the charge-discharge instruction is distributed to each energy storage unit according to the two-factor power distribution coefficient.

[0037] Each energy storage unit corresponds to a two-factor power distribution coefficient. The power included in the charge-discharge instruction can be distributed to each energy storage unit according to the two-factor power distribution coefficient corresponding to each energy storage unit, so that each energy storage unit outputs according to the distributed power. The output here includes charging or discharging.

[0038] In the embodiment of the present application, when the cell temperature of the single cell in the energy storage system meets the temperature factor condition, it can be determined that the temperature factor in the energy storage system has a greater impact on the charge-discharge response of the energy storage unit, and the charge-discharge response of the energy storage unit is restricted by the cell voltage of the single cell. According to the cell voltage, cell temperature, voltage regulation parameter, and temperature regulation parameter, the two-factor power distribution coefficient of each energy storage unit is determined. Both the cell voltage and the cell temperature are accurate measured parameters. Distributing the power to be scheduled to each energy storage unit according to the two-factor power distribution coefficient obtained by comprehensively considering the temperature factor and the voltage factor can reduce the difference in the cell voltage of each energy storage unit and the difference in the cell temperature of each energy storage unit, ensure the consistency of the charge-discharge response of each energy storage unit, and thus improve the response duration of the energy storage system to respond to power scheduling.

[0039] In order to verify the effectiveness of the power distribution method of the energy storage system provided by the embodiment of the present application, the existing related technology and the power distribution method of the energy storage system provided by the embodiment of the present application are respectively executed under the same conditions. Figure 2 This is a comparison diagram of the effects of an example of the two methods provided by the embodiment of the present application. Figure 2The abscissa is time (unit: minute), and the ordinate is power (unit: megawatt, MW). Under the grid system conditions of 100 megawatts (i.e., MW) / 200 megawatt-hours (i.e., MWH), the power included in the charge-discharge instruction is 80 MW. Method 1 is the power distribution method of the energy storage system provided by the embodiments of the present application, and Method 2 is the existing related technology. The column coverage area of Method 1 is the same as that of Method 2, but when using Method 2, the power will drop at about 120 minutes, and individual energy storage units reach the state of prohibited charging or prohibited discharging and cannot continue to maintain the power required for the 80 MW scheduling. That is, the response duration of the energy storage system using Method 2 to respond to power scheduling is 120 minutes. Using Method 1 can improve the consistency when the energy storage unit reaches the state of prohibited discharging or prohibited charging, and the power drops at about 136 minutes. The response duration of the energy storage system using Method 1 to respond to power scheduling is 136 minutes, which is 16 minutes longer than that using Method 1. It can be seen that the power distribution method of the energy storage system provided by the embodiments of the present application can effectively increase the response duration of the energy storage system to respond to power scheduling.

[0040] In some embodiments, the extreme value of the cell voltage and the extreme value of the cell temperature can be obtained, and the two-factor power distribution coefficient can be obtained based on the extreme value of the cell voltage and the extreme value of the cell temperature. Figure 3 It is a flowchart of the power distribution method of the energy storage system provided by another embodiment of the present application. Figure 3 Different from Figure 1 is that Figure 1 Step S102 in Figure 3 can be specifically refined into

[0041] In step S1021, when the cell temperature meets the temperature factor condition, the voltage extreme value of all single cells in each energy storage unit and the temperature extreme value of all single cells in each energy storage unit are obtained.

[0042] The voltage extreme value can include the voltage maximum value or the voltage minimum value. For example, the voltage maximum value of all single cells in the i-th energy storage unit obtained can be expressed as V i,max , V i,max = max(V i,1 , V i,2 , …, V i,m ), and the voltage minimum value of all single cells in the i-th energy storage unit obtained can be expressed as V i,min , V i,min = min(V i,1 , V i,2 , …, V i,m), where m is the number of single cells in the i-th energy storage unit, V i,1 is the cell voltage of the first single cell in the i-th energy storage unit, V i,2 is the cell voltage of the second single cell in the i-th energy storage unit, V i,m is the cell voltage of the m-th single cell in the i-th energy storage unit, max() is used to calculate the maximum value, min() is used to calculate the minimum value, i is a positive integer and 1 ≤ i ≤ n, and n is the number of energy storage units in the energy storage system.

[0043] The extreme temperature values can include the maximum temperature value or the minimum temperature value. For example, the maximum temperature value of the cell temperatures of all single cells in the i-th energy storage unit obtained can be expressed as T i,max , T i,max = max(T i,1 , T i,2 , …, T i,m ), and the minimum temperature value of the cell temperatures of all single cells in the i-th energy storage unit obtained can be expressed as T i,min , T i,min = min(T i,1 , T i,2 , …, T i,m ), where m is the number of single cells in the i-th energy storage unit, T i,1 is the cell temperature of the first single cell in the i-th energy storage unit, T i,2 is the cell temperature of the second single cell in the i-th energy storage unit, T i,m is the cell temperature of the m-th single cell in the i-th energy storage unit, max() is used to calculate the maximum value, min() is used to calculate the minimum value, i is a positive integer and 1 ≤ i ≤ n, and n is a positive integer and n is the number of energy storage units in the energy storage system. According to the maximum temperature value and the minimum temperature value of the cell temperatures of all single cells in each energy storage unit, the maximum value of the cell temperatures of all single cells in the energy storage system and the minimum value of the cell temperatures of all single cells in the energy storage system can be obtained. For example, the maximum value of the cell temperatures of all single cells in the energy storage system T max = max(T 1,max , T 2,max , …, T n,max ), and the minimum value of the cell temperatures of all single cells in the energy storage system T min = min(T 1,min , T 2,min , …, T n,min ).

[0044] In step S1022, based on the voltage extreme values, voltage regulation parameters, and preset cell voltage cut-off values of all energy storage units, the two-factor voltage allocation values of each energy storage unit are obtained.

[0045] The cut-off value of the cell voltage includes the charging cut-off value of the cell voltage and the discharging cut-off value of the cell voltage. The charging cut-off value of the cell voltage is the cut-off value of the cell voltage required to stop charging, and the discharging cut-off value of the cell voltage is the cut-off value of the cell voltage required to stop discharging. The two-factor voltage allocation value is the voltage allocation value obtained by comprehensively considering two factors, namely the voltage factor and the temperature factor. The two-factor voltage allocation value can be used to calculate the two-factor power distribution coefficient when comprehensively considering the voltage factor and the temperature factor. The two-factor voltage allocation value of a storage unit can be obtained according to the difference between the voltage extreme value of this storage unit and the cut-off value of the cell voltage, or according to the difference between the cut-off value of the cell voltage and the voltage extreme value of this storage unit. For the convenience of description, here the difference between the voltage extreme value of this storage unit and the cut-off value of the cell voltage is called the first difference, and the difference between the cut-off value of the cell voltage and the voltage extreme value of this storage unit is called the second difference. In some examples, the two-factor voltage allocation value of this storage unit can be obtained by adding the first difference and the voltage adjustment parameter, or the two-factor voltage allocation value of this storage unit can be obtained by adding the second difference and the voltage adjustment parameter. In some examples, the two-factor voltage allocation value of this storage unit can be obtained by multiplying the voltage adjustment parameter and the first difference, or the two-factor voltage allocation value of this storage unit can be obtained by multiplying the voltage adjustment parameter and the second difference.

[0046] In some examples, when the charge-discharge instruction indicates charging, the voltage extreme value may include the voltage maximum value; when the charge-discharge instruction indicates discharging, the voltage extreme value may include the voltage minimum value. For example, when the charge-discharge instruction indicates charging, the two-factor voltage allocation value of the i-th storage unit can be expressed as V Hlimit +V 0 -V i,max ; when the charge-discharge instruction indicates discharging, the two-factor voltage allocation value of the i-th storage unit can be expressed as V i,min -V Llimit +V 0 ; where, V Hlimit is the charging cut-off value of the cell voltage, V Llimit is the discharging cut-off value of the cell voltage, V 0 is the voltage adjustment parameter, the unit of the voltage adjustment parameter is the same as the unit of the voltage, V 0 can be greater than or equal to 5 volts, V i,max is the voltage maximum value of the cell voltage in the i-th storage unit, V i,min is the voltage minimum value of the cell voltage in the i-th storage unit. Another example, when the charge-discharge instruction indicates charging, the two-factor voltage allocation value of the i-th storage unit can be expressed as α(V Hlimit -V i,max);When the charge-discharge command represents discharge, the two-factor voltage allocation value of the i-th energy storage unit can be expressed as α(V i,min -V Llimit ); where α is the voltage regulation parameter, α can be less than 1, and the descriptions of other parameters can be referred to above and will not be elaborated here.

[0047] In step S1023, based on the respective temperature extreme values and temperature regulation parameters of all energy storage units, the two-factor temperature allocation values of each energy storage unit are obtained.

[0048] The two-factor temperature allocation value is the temperature allocation value obtained by comprehensively considering two factors: the voltage factor and the temperature factor. The two-factor temperature allocation value can be used to calculate the two-factor power distribution coefficient when comprehensively considering the voltage factor and the temperature factor. The two-factor temperature allocation value of an energy storage unit can be obtained according to the difference between the maximum value of the cell temperatures of all single cells in the energy storage system and the temperature extreme value of this energy storage unit, or, according to the difference between the minimum value among the temperature extreme values of all energy storage units and the temperature extreme value of this energy storage unit. For the convenience of explanation, here the difference between the maximum value of the cell temperatures of all single cells in the energy storage system and the temperature extreme value of this energy storage unit is called the third difference, and the difference between the minimum value among the temperature extreme values of all energy storage units and the temperature extreme value of this energy storage unit is called the fourth difference. In some examples, the two-factor temperature allocation value can be obtained by adding the third difference and the temperature regulation parameter, or, the two-factor temperature allocation value can be obtained by adding the fourth difference and the temperature regulation parameter. In some examples, the two-factor temperature allocation value can be obtained by multiplying the temperature regulation parameter and the third difference, or, the two-factor temperature allocation value can be obtained by multiplying the temperature regulation parameter and the fourth difference.

[0049] In some examples, when the maximum value of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper threshold, the temperature extreme value includes the temperature maximum value; when the minimum value of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower threshold, the temperature extreme value includes the temperature minimum value. For example, regardless of whether it is in the charging state or the discharging state, when the maximum value T max of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper threshold T H , the two-factor temperature allocation value of the i-th energy storage unit can be expressed as T max +T 0 -T i,max ; when the minimum value T min of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower threshold T L , the two-factor temperature allocation value of the i-th energy storage unit can be expressed as T min,max +T0 -T i,min ; where T min,max = max(T 1,min , T 2,min , …, T n,min ), T 0 is the temperature adjustment parameter, T 0 can be greater than or equal to 5 degrees Celsius. For the descriptions of T max , T i,max , and T i,min , please refer to the above text and will not be elaborated here. For another example, whether in the charging state or the discharging state, when the maximum value T max of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper limit threshold T H , the two-factor temperature distribution value of the i-th energy storage unit can be expressed as β(T max - T i,max ); when the minimum value T min of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower limit threshold T L , the two-factor temperature distribution value of the i-th energy storage unit can be expressed as β(T min,max - T i,min ); where β is the temperature adjustment parameter, β can be less than 1, and α + β = 1. For the descriptions of T max , T i,max , T min,max , T i,min , please refer to the above text and will not be elaborated here.

[0050] In step S1024, according to the two-factor voltage distribution value and the two-factor temperature distribution value, obtain the two-factor power distribution coefficient of each energy storage unit.

[0051] The two-factor power distribution coefficient of the energy storage unit can be implemented as the proportional coefficient for allocating power to the energy storage unit considering both the voltage factor and the temperature factor, and can be regarded as a ratio. In some examples, according to the two-factor voltage distribution values and the two-factor temperature distribution values of all energy storage units, the denominator, i.e., the latter term, of the two-factor power distribution coefficient implemented as a ratio can be obtained. According to the two-factor voltage distribution value and the two-factor temperature distribution value of an energy storage unit, the numerator, i.e., the former term, of the two-factor power distribution coefficient implemented as a ratio can be obtained. For example, in the charging state, if the maximum value T max of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper limit threshold T H , then the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (1). If the minimum value T min of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower limit threshold T L, the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (2); in the discharge state, if the maximum value T of the cell temperatures of all single cells in the energy storage system max is greater than the temperature correction upper threshold T H , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (3). If the minimum value T of the cell temperatures of all single cells in the energy storage system min is less than the temperature correction lower threshold T L , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (4).

[0052]

[0053] where, R i is the two-factor power distribution coefficient of the i-th energy storage unit. For other parameters, please refer to the relevant descriptions above and will not be elaborated here.

[0054] In some examples, according to the two-factor voltage allocation values of all energy storage units, the denominator, i.e., the latter term, of the voltage factor power distribution coefficient realized as a ratio can be obtained. According to the two-factor voltage allocation value of one energy storage unit, the numerator, i.e., the former term, of the voltage factor power distribution coefficient realized as a ratio can be obtained. According to the two-factor temperature allocation values of all energy storage units, the denominator, i.e., the latter term, of the temperature factor power distribution coefficient realized as a ratio can be obtained. According to the two-factor temperature allocation value of one energy storage unit, the numerator, i.e., the former term, of the temperature factor power distribution coefficient realized as a ratio can be obtained. According to the voltage factor power distribution coefficient and the temperature factor power distribution coefficient, the two-factor power distribution coefficient can be obtained. Specifically, the sum of the voltage factor power distribution coefficient and the temperature factor power distribution coefficient can be determined as the two-factor power distribution coefficient. For example, in the charging state, if the maximum value T of the cell temperatures of all single cells in the energy storage system max is greater than the temperature correction upper threshold T H , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (5). If the minimum value T of the cell temperatures of all single cells in the energy storage system min is less than the temperature correction lower threshold T L , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (6); in the discharge state, if the maximum value T of the cell temperatures of all single cells in the energy storage system max is greater than the temperature correction upper threshold T H , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (7). If the minimum value T of the cell temperatures of all single cells in the energy storage system min is less than the temperature correction lower threshold T L , the two-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (8).

[0055]

[0056] wherein, R i is the two-factor power distribution coefficient of the i-th energy storage unit, and other parameters can be referred to the relevant descriptions above and will not be elaborated here.

[0057] After obtaining the two-factor power distribution coefficients of each energy storage unit, the two-factor power distribution coefficients of each energy storage unit can be multiplied by the power included in the charge and discharge command respectively to obtain the power that should be allocated to each energy storage unit. For example, the power allocated to the i-th energy storage unit can be shown as the following formula (9):

[0058] P i = P AGC * R i (9)

[0059] wherein, P i is the power allocated to the i-th energy storage unit; P AGC is the power included in the charge and discharge command; R i is the two-factor power distribution coefficient, and the acquisition method can be referred to the above and will not be elaborated here.

[0060] In the embodiments of the present application, the cell voltage and cell temperature of the single cell are used as the basis for power distribution. During the charging process, relatively lower power is allocated to the energy storage unit with a relatively higher maximum voltage value of the cell voltage, and relatively higher power is allocated to the energy storage unit with a relatively lower maximum voltage value of the cell voltage; during the discharging process, relatively higher power is allocated to the energy storage unit with a higher minimum voltage value of the cell voltage, and relatively lower power is allocated to the energy storage unit with a lower minimum voltage value of the cell voltage. Referring to the temperature factor, in the case where the maximum value of the cell temperature of all single cells in the energy storage system is greater than the temperature correction upper limit threshold, relatively lower power is allocated to the energy storage unit with a relatively higher maximum value of the cell temperature, and relatively higher power is allocated to the energy storage unit with a relatively lower maximum value of the cell temperature; in the case where the minimum value of the cell temperature of all single cells in the energy storage system is less than the temperature correction lower limit threshold, relatively lower power is allocated to the energy storage unit with a relatively higher minimum value of the cell temperature, and relatively higher power is allocated to the energy storage unit with a relatively lower minimum value of the cell temperature. Referring to both the voltage factor and the temperature factor, the difference in power distribution is used to reduce the difference in cell voltage between energy storage units and the difference in cell temperature between energy storage units, improve the consistency of the charge and discharge response of each energy storage unit, and thus improve the response duration of the energy storage system to respond to power scheduling.

[0061] In some embodiments, if the cell temperature does not meet the temperature factor condition, the temperature factor may not be referred to, and the single-factor power distribution coefficient of each energy storage unit may be obtained mainly by referring to the voltage factor, so as to distribute the power included in the charge and discharge instructions. Figure 4 The flowchart of the power distribution method of the energy storage system provided by another embodiment of the present application Figure 4 is different from Figure 1 that Figure 4 the power distribution method of the energy storage system shown also includes step S104 and step S105.

[0062] In step S104, when the cell temperature does not meet the temperature factor condition, based on the charge and discharge instructions issued by the scheduling and the cell voltages and voltage adjustment parameters of all single cells in the energy storage system, or based on the cell voltages of all single cells in the energy storage system, the single-factor power distribution coefficient of each energy storage unit is obtained.

[0063] For the specific contents of the charge and discharge instructions, cell voltages, and voltage adjustment parameters, reference may be made to the relevant descriptions above and will not be elaborated here. The cell temperature not meeting the temperature factor condition means that the influence of the cell temperature on the charge and discharge response of the energy storage unit can be ignored. When the cell temperature does not meet the temperature factor condition, the temperature factor may not be referred to, and only the voltage factor is referred to obtain the power distribution coefficient of each energy storage unit, that is, the single-factor power distribution coefficient. The single-factor power distribution coefficient is the power distribution coefficient referring to only one factor of the cell voltage.

[0064] In some examples, the single-factor power distribution coefficient of each energy storage unit may be obtained without introducing the voltage adjustment parameter. In other examples, the single-factor power distribution coefficient of each energy storage unit may be obtained by introducing the voltage adjustment parameter. The unit of the voltage adjustment parameter may be the same as the unit of the cell voltage. For example, the unit of the voltage adjustment parameter may be volts, such as the voltage adjustment parameter may be greater than or equal to 5 volts.

[0065] In step S105, the power included in the charge and discharge instructions is distributed to each energy storage unit according to the single-factor power distribution coefficient.

[0066] Each energy storage unit corresponds to a single-factor power distribution coefficient. The power included in the charge and discharge instructions may be distributed to each energy storage unit according to the single-factor power distribution coefficient corresponding to each energy storage unit, so that each energy storage unit outputs according to the distributed power. Here, the output includes charging or discharging.

[0067] In some embodiments, the extreme value of the cell voltage may be obtained, and the single-factor power distribution coefficient may be obtained based on the extreme value of the cell voltage. Figure 5 The flowchart of the power distribution method of the energy storage system provided by yet another embodiment of the present application Figure 5 is different fromFigure 4 is different in that Figure 4 step S104 in Figure 5 can be specifically refined into step S1041 to step S1043 in

[0068] In step S1041, obtain the voltage extreme values of all single cells in each energy storage unit.

[0069] For the specific content of the voltage extreme values, refer to the above text and will not be elaborated here.

[0070] In step S1042, based on the respective voltage extreme values, voltage adjustment parameters, and preset cut-off values of cell voltages of all energy storage units, or based on the respective voltage extreme values and cut-off values of cell voltages of all energy storage units, obtain the single-factor voltage allocation values of each energy storage unit.

[0071] For the specific content of the voltage extreme values, voltage adjustment parameters, and cut-off values of cell voltages, refer to the relevant descriptions above and will not be elaborated here. The single-factor voltage allocation value is the voltage allocation value obtained under the condition of referring to only one voltage factor. The single-factor voltage allocation value can be used to calculate the single-factor power distribution coefficient under the condition of referring to only one voltage factor. The single-factor voltage allocation value of an energy storage unit can be obtained according to the difference between the voltage extreme value and the cut-off value of cell voltage of this energy storage unit, i.e., the first difference, or according to the difference between the cut-off value of cell voltage and the voltage extreme value of this energy storage unit, i.e., the second difference. In some examples, the single-factor voltage allocation value of this energy storage unit can be obtained by adding the first difference and the voltage adjustment parameter, or the two-factor voltage allocation value of this energy storage unit can be obtained by adding the second difference and the voltage adjustment parameter. In some examples, the single-factor voltage allocation value of this energy storage unit can include the first difference or the second difference.

[0072] In some examples, when the charge-discharge instruction indicates charging, the voltage extreme value can include the voltage maximum value; when the charge-discharge instruction indicates discharging, the voltage extreme value can include the voltage minimum value. For example, when the charge-discharge instruction indicates charging, the single-factor voltage allocation value of the i-th energy storage unit can be expressed as V Hlimit +V 0 -V i,max ; when the charge-discharge instruction indicates discharging, the single-factor voltage allocation value of the i-th energy storage unit can be expressed as V i,min -V Llimit +V 0 ; where V Hlimit 、V 0 、V i,max 、V i,min 、V LlimitParameters such as these can be referred to the relevant descriptions in the above text and will not be elaborated here. For another example, when the charge-discharge instruction represents charging, the single-factor voltage allocation value of the i-th energy storage unit can be expressed as V Hlimit -V i,max ; when the charge-discharge instruction represents discharging, the single-factor voltage allocation value of the i-th energy storage unit can be expressed as V i,min -V Llimit ; where V Hlimit 、V i,max 、V i,min 、V Llimit and other parameters can be referred to the relevant descriptions in the above text and will not be elaborated here.

[0073] In step S1043, according to the single-factor voltage allocation value, the single-factor power distribution coefficient of each energy storage unit is obtained.

[0074] The single-factor power distribution coefficient of the energy storage unit can be implemented as the proportional coefficient for allocating power to the energy storage unit in the case of only one factor of the reference voltage factor, and can be regarded as a ratio. In some examples, according to the single-factor voltage allocation values of all energy storage units, the denominator, that is, the latter term, of the single-factor power distribution coefficient implemented as a ratio can be obtained. According to the single-factor voltage allocation value of one energy storage unit, the numerator, that is, the former term, of the single-factor power distribution coefficient implemented as a ratio can be obtained. For example, in the charging state, the single-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (10); in the discharging state, the single-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (11).

[0075]

[0076] where R′ i is the single-factor power distribution coefficient of the i-th energy storage unit, and other parameters can be referred to the relevant descriptions in the above text and will not be elaborated here.

[0077] For another example, in the charging state, the single-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (12); in the discharging state, the single-factor power distribution coefficient of the i-th energy storage unit can be shown as the following formula (13).

[0078]

[0079] where R′ i is the single-factor power distribution coefficient of the i-th energy storage unit, and other parameters can be referred to the relevant descriptions in the above text and will not be elaborated here.

[0080] After obtaining the two-factor power distribution coefficients of each energy storage unit, the two-factor power distribution coefficients of each energy storage unit can be multiplied by the power included in the charge and discharge command respectively to obtain the power that should be allocated to each energy storage unit. For example, the power allocated to the i-th energy storage unit can be shown as the following formula (14):

[0081] P i =P AGC *R′ i (14)

[0082] Wherein, P i is the power allocated to the i-th energy storage unit; P AGC is the power included in the charge and discharge command; R′ i is the single-factor power distribution coefficient, and the acquisition method can be referred to the above text and will not be elaborated here.

[0083] In the embodiments of the present application, the cell voltage of the single cell is used as the basis for power distribution. During the charging process, relatively lower power is allocated to the energy storage unit with a relatively higher maximum value of the cell voltage, and relatively higher power is allocated to the energy storage unit with a relatively lower maximum value of the cell voltage; during the discharging process, relatively higher power is allocated to the energy storage unit with a higher minimum value of the cell voltage, and relatively lower power is allocated to the energy storage unit with a lower minimum value of the cell voltage. By referring to only one factor of the reference voltage factor, the difference in the cell voltage between energy storage units is reduced through the difference in power distribution, and the consistency of the charge and discharge response of each energy storage unit is improved, thereby increasing the response duration of the energy storage system to respond to power scheduling.

[0084] The present application provides a power distribution device for an energy storage system, corresponding to the power distribution method of the energy storage system in the above embodiments. The specific content of the energy storage system can be referred to the relevant descriptions in the above embodiments and will not be elaborated here. Figure 6 For a schematic structural diagram of a power distribution device for an energy storage system provided by an embodiment of the present application, as Figure 6 shown, the power distribution device 200 of the energy storage system may include a data acquisition module 201, a coefficient determination module 202, and a power distribution module 203.

[0085] The data acquisition module 201 can be used to acquire the cell voltage and cell temperature of each single cell in all energy storage units.

[0086] The coefficient determination module 202 can be used to determine the two-factor power distribution coefficients of each energy storage unit based on the charge and discharge command issued by the scheduling and the cell voltage, cell temperature, voltage adjustment parameter, and temperature adjustment parameter of all single cells in the energy storage system when the cell temperature meets the preset temperature factor condition.

[0087] The power distribution module 203 can be used to distribute the power included in the charge and discharge instruction to each energy storage unit according to the two-factor power distribution coefficient.

[0088] In some embodiments, the coefficient determination module 202 can specifically be used to: obtain the voltage extreme values of the cell voltages of all single cells in each energy storage unit, and the temperature extreme values of the cell temperatures of all single cells in each energy storage unit; based on the voltage extreme values, voltage adjustment parameters of each energy storage unit and the preset cell voltage cut-off value, obtain the two-factor voltage allocation values of each energy storage unit; based on the temperature extreme values and temperature adjustment parameters of each energy storage unit, obtain the two-factor temperature allocation values of each energy storage unit; according to the two-factor voltage allocation values and the two-factor temperature allocation values, obtain the two-factor power distribution coefficient of each energy storage unit.

[0089] In some embodiments, the coefficient determination module 202 can also be used to: when the cell temperature does not meet the temperature factor condition, based on the charge and discharge instruction issued by the scheduling and the cell voltages and voltage adjustment parameters of all single cells in the energy storage system, or based on the cell voltages of all single cells in the energy storage system, obtain the single-factor power distribution coefficients of each energy storage unit.

[0090] The power distribution module 203 can also be used to: distribute the power included in the charge and discharge instruction to each energy storage unit according to the single-factor power distribution coefficient.

[0091] In some embodiments, the power distribution module 203 can specifically be used to: obtain the voltage extreme values of the cell voltages of all single cells in each energy storage unit; based on the voltage extreme values, voltage adjustment parameters of each energy storage unit and the preset cell voltage cut-off value, or based on the voltage extreme values and the cell voltage cut-off value of each energy storage unit, obtain the single-factor voltage allocation values of each energy storage unit; according to the single-factor voltage allocation values, obtain the single-factor power distribution coefficient of each energy storage unit.

[0092] In some embodiments, when the charge and discharge instruction represents charging, the voltage extreme value includes the voltage maximum value. When the charge and discharge instruction represents discharging, the voltage extreme value includes the voltage minimum value.

[0093] In some embodiments, when the maximum value of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper threshold, the temperature extreme value includes the temperature maximum value. When the minimum value of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower threshold, the temperature extreme value includes the temperature minimum value.

[0094] In some embodiments, the temperature factor condition includes: the maximum value of the cell temperatures of all single cells in the energy storage system is greater than the temperature correction upper threshold, or the minimum value of the cell temperatures of all single cells in the energy storage system is less than the temperature correction lower threshold.

[0095] It should be noted that the power distribution device 200 of the energy storage system is a device corresponding to the above-mentioned power distribution method of the energy storage system. All implementation manners in the above method embodiments are applicable to the embodiments of this device, and the same technical effects can also be achieved.

[0096] This application also provides an energy management device, which can be applied to an energy management system. Figure 7 As shown in the structure schematic diagram of the energy management device provided by an embodiment of this application, Figure 7 As shown, the energy management device 300 includes a memory 301, a processor 302, and a computer program stored on the memory 301 and executable on the processor 302.

[0097] In some examples, the above-mentioned processor 302 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0098] The memory 301 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Therefore, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (such as a memory device) encoded with software including computer-executable instructions, and when the software is executed (for example, by one or more processors), it is operable to perform the operations described with reference to the power distribution method of the energy storage system in the embodiments of this application.

[0099] The processor 302 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 301, so as to implement the power distribution method of the energy storage system in the above embodiments.

[0100] In some examples, the energy management device 300 may further include a communication interface 303 and a bus 304. Among them, as Figure 7 shown, the memory 301, the processor 302, and the communication interface 303 are connected through the bus 304 to complete mutual communication.

[0101] The communication interface 303 is mainly used to implement communication between each module, device, unit, and / or device in the embodiments of this application. The input device and / or output device can also be accessed through the communication interface 303.

[0102] The bus 304 includes hardware, software, or both, and couples the components of the energy management device 300 to each other. By way of example and not limitation, the bus 304 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low pin count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, the bus 304 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0103] The present application also provides a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the power distribution method of the energy storage system in the above embodiments can be implemented, and the same technical effects can be achieved. To avoid repetition, it will not be elaborated here. Among them, the above computer-readable storage medium may include a non-transitory computer-readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disc, etc., which are not limited herein.

[0104] The present application may also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the power distribution method of the energy storage system in the above embodiments is implemented, and the same technical effects can be achieved. To avoid repetition, it will not be elaborated here.

[0105] It should be clear that each embodiment in this specification is described in a progressive manner. For the parts that are the same or similar among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. For the device embodiments, equipment embodiments, computer-readable storage medium embodiments, and computer program product embodiments, the relevant parts can refer to the description part of the method embodiments. The present application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps after understanding the spirit of the present application. And, for the sake of brevity, the detailed description of known method technologies is omitted here.

[0106] The above has described various aspects of the present application with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each block in the flowchart and / or block diagram, as well as the combinations of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each block in the block diagram and / or flowchart, as well as the combinations of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0107] Those skilled in the art should understand that the above embodiments are all exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other variations of the disclosed embodiments based on the study of the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other devices or steps; the quantifier "one" does not exclude a plurality; the terms "first" and "second" are used to label names rather than to indicate any specific order. Any reference signs in the claims should not be construed as limiting the scope of protection. The functions of multiple parts in the claims can be implemented by a single hardware or software module. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A power distribution method for an energy storage system, characterized in that: The energy storage system includes a plurality of energy storage units, each of which includes a plurality of single cells. The method includes: Obtain the cell voltage and cell temperature of each single cell in all energy storage units; When the cell temperature meets the preset temperature factor conditions, the dual-factor power allocation coefficient of each energy storage unit is determined based on the charge and discharge instructions issued by the dispatcher and the cell voltage, cell temperature, voltage regulation parameters and temperature regulation parameters of all single cells in the energy storage system; The power contained in the charge and discharge instruction is distributed to each energy storage unit according to the dual-factor power distribution coefficient.

2. The method according to claim 1, characterized in that: The dual-factor power allocation coefficient of each energy storage unit is determined based on the charge and discharge instructions issued by the scheduling and the cell voltage, cell temperature, voltage regulation parameters and temperature regulation parameters of all single cells in the energy storage system, including: Obtaining the voltage extremes of the cell voltages of all the single cells in each energy storage unit, and the temperature extremes of the cell temperatures of all the single cells in each energy storage unit; Based on the respective voltage extreme values ​​of all energy storage units, the voltage adjustment parameters and the preset cell voltage cutoff value, a dual-factor voltage adjustment value of each energy storage unit is obtained; Based on the respective temperature extreme values ​​of all energy storage units and the temperature adjustment parameters, a dual-factor temperature adjustment value of each energy storage unit is obtained; The dual-factor power allocation coefficient of each energy storage unit is obtained according to the dual-factor voltage allocation value and the dual-factor temperature allocation value.

3. The method according to claim 1, characterized in that Also includes: When the cell temperature does not meet the temperature factor condition, the single factor power allocation coefficient of each energy storage unit is obtained based on the charge and discharge instructions issued by the scheduler and the cell voltage and voltage regulation parameters of all single cells in the energy storage system, or based on the cell voltage of all single cells in the energy storage system; The power contained in the charge and discharge instruction is distributed to each energy storage unit according to the single factor power distribution coefficient.

4. The method according to claim 3, characterized in that The single factor power allocation coefficient of each energy storage unit is obtained based on the charge and discharge instructions issued by the scheduling and the cell voltages and voltage regulation parameters of all single cells in the energy storage system, or based on the cell voltages of all single cells in the energy storage system, including: Obtaining the voltage extreme values ​​of the cell voltages of all single cells in each energy storage unit; Based on the respective voltage extreme values ​​of all energy storage units, the voltage adjustment parameter and the preset cell voltage cutoff value, or based on the respective voltage extreme values ​​of all energy storage units and the cell voltage cutoff value, a single factor voltage allocation value of each energy storage unit is obtained; The single factor power allocation coefficient of each energy storage unit is obtained according to the single factor voltage allocation value.

5. The method according to claim 2 or 4, characterized in that: In the case where the charge and discharge instruction represents charging, the voltage extreme value includes a voltage maximum value; When the charge / discharge instruction represents discharge, the voltage extreme value includes a voltage minimum value.

6. The method according to claim 2, characterized in that In the case where the maximum values ​​of the cell temperatures of all the single cells in the energy storage system are greater than the temperature correction upper limit threshold, the temperature extremes include the temperature maximum value; When the minimum values ​​of the cell temperatures of all the single cells in the energy storage system are less than the temperature correction lower limit threshold, the temperature extreme value includes the temperature minimum value.

7. The method according to claim 1, characterized in that The temperature factor conditions include: The maximum value of the cell temperature of all the single cells in the energy storage system is greater than the temperature correction upper limit threshold, or the minimum value of the cell temperature of all the single cells in the energy storage system is less than the temperature correction lower limit threshold.

8. A power distribution device for an energy storage system, characterized in that: The energy storage system includes a plurality of energy storage units, each of which includes a plurality of single cells, and the device includes: A data acquisition module is used to obtain the cell voltage and cell temperature of each single cell in all energy storage units; A coefficient determination module is used to determine the dual-factor power allocation coefficient of each energy storage unit based on the charge and discharge instructions issued by the scheduling and the cell voltage, cell temperature, voltage regulation parameters and temperature regulation parameters of all single cells in the energy storage system when the cell temperature meets the preset temperature factor conditions; A power distribution module is used to distribute the power contained in the charge and discharge instructions to each energy storage unit according to the dual-factor power distribution coefficient.

9. An energy management device, characterized in that: Application and energy management system, the device comprising: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the power distribution method of the energy storage system according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the power distribution method for the energy storage system according to any one of claims 1 to 7 is implemented.

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