Electric energy storage discrete type charging and discharging power modeling method

Abstract

The invention discloses an electric energy storage discrete type charging and discharging power modeling method. The method comprises the following steps: (1) obtaining electric energy storage operation parameters; (2) setting an electric energy storage power adjustment step length according to the AGC maximum command adjustment step length and the electric energy storage maximum charging and discharging rate, and determining an electric energy storage discretization charging and discharging power set; (3) constructing an electric energy storage discrete charging and discharging power model, wherein an energy charging and discharging power plan is more suitable for actual production and operation requirements; according to the method, the generation of'jump 'and'burr' of the charging and discharging power is inhibited, so that the energy storage charging and discharging power plan issued by the power grid better meets the actual production and operation requirements, and the performability of the electric energy storage clearing result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a discrete charging and discharging power modeling method for electric energy storage. Background Art

[0002] Electrochemical energy storage is a large-scale energy storage technology that is currently developing rapidly. It has the advantages of high energy storage density, low throughput delay, high safety, easy large-scale application, and smooth operation in four quadrants. Due to its characteristics of bidirectional flow of electric energy, energy time shifting, and flexible power regulation, it can store surplus electricity in the "body" in real time when the power intensity of the power grid is low. When the power consumption is peak, the stored electricity will be released to the power grid to improve the peak-shaving capacity of the Dalian power grid by "cutting the peak and filling the valley". Therefore, by reasonably arranging the charging and discharging power of electric energy storage, the problem of insufficient grid regulation capacity caused by a high proportion of new energy can be effectively solved, and it has excellent performance in assisting the peak-shaving of the power grid.

[0003] Conventional electric energy storage uses a continuous charging and discharging power modeling method, and the obtained charging and discharging plan has large jumps and glitches. Although in theory, the rate of tracking the charging and discharging plan of electric energy storage is very fast, from the perspective of actual operation, in order to track the charging and discharging plan, the energy storage device has to frequently change the charging and discharging power and state, which increases the loss of energy storage capacity and makes the result unexecutable. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a discrete charging and discharging power modeling method for electric energy storage, so as to solve the problem of frequent jumps and glitches in the charging and discharging plan obtained by the existing continuous charging and discharging power energy storage modeling method.

[0005] Technical solution: A method for modeling discrete charge and discharge power of electric energy storage described in the present invention comprises the following steps:

[0006] (1) Obtaining electric energy storage operating parameters;

[0007] (2) according to the maximum AGC command adjustment step and the maximum charge and discharge rate of the energy storage, the energy storage power adjustment step is set, and the discrete charge and discharge power set of the energy storage is determined;

[0008] (3) Construct a discrete charging and discharging power model for electric energy storage, so that the charging and discharging power plan is more in line with the actual production and operation needs.

[0009] Furthermore, in step (1), the electric energy storage operation parameters include the electric energy storage capacity, the initial energy storage capacity, the upper and lower limits of the charge, and the number of hours of continuous charge and discharge operation.

[0010] Furthermore, it is characterized in that step (2) is specifically as follows: the energy storage charging and discharging power sets are respectively:

[0011]

[0012] Among them, P c , P d Respectively represent the charging and discharging power of the electric energy storage; △p c , △p d They respectively represent the adjustment step length of the charging and discharging power of the electric energy storage; Respectively represent the multiples of the charging and discharging power adjustment step length of the energy storage; M c 、N d Respectively represent the maximum step length multiples of charge and discharge; They represent the maximum charge and discharge rates of the energy storage.

[0013] Furthermore, step (3) is specifically as follows: including: the charging and discharging power of the energy storage can only be in one gear in the set in the same time period, the energy storage cannot be charged and discharged simultaneously in adjacent time periods, one charging and discharging gear of the energy storage must be continuously operated for a period of time, and conventional constraints.

[0014] Furthermore, the formula for the charging and discharging power of the energy storage can only be in one gear in the set in the same period is as follows:

[0015]

[0016] Among them, the introduction of 0 / 1 integer variables Indicates that the charging power of the energy storage is at the mth gear in the charging power set during the t period; introduces a 0 / 1 integer variable Indicates that the discharge power of the energy storage is at the nth level in the discharge power set during the t period; introduces a 0 / 1 integer variable It means that the energy storage is neither charged nor discharged during the period t.

[0017] Furthermore, the formula for the energy storage not to be charged and discharged simultaneously in adjacent time periods is as follows:

[0018]

[0019] Among them, M c 、N d Respectively represent the maximum step length multiples of charge and discharge; Respectively represent that the charging power of the energy storage is at the mth gear in the charging power set during the t period and the t+1 period; introduce 0 / 1 integer variables They respectively indicate that the discharge power of the energy storage in time period t and time period t+1 is at the nth level in the discharge power set.

[0020] Furthermore, the formula for the period of time that a charging and discharging gear of energy storage needs to run continuously is as follows:

[0021]

[0022] in, They respectively represent the minimum continuous operating time of a charging and discharging gear of the energy storage.

[0023] Furthermore, the conventional constraints are as follows: the charging and discharging power in each period must meet the upper and lower limit constraints:

[0024]

[0025] In the formula, Respectively represent the maximum and minimum charging rates of electric energy storage; They represent the maximum and minimum discharge rates of the energy storage respectively.

[0026] The remaining capacity of the energy storage at time t is related to time t-1:

[0027]

[0028] Among them, E es,t is the remaining power in the energy storage device at time t, and They are the power output and the amount of electricity absorbed by the energy storage device to the grid during time period t, α and β represent the charge and discharge conversion rates, and △t is the charge and discharge period.

[0029] The battery status of the energy storage system is expressed by the state of charge SOC, and its calculation formula is as follows. SOC is expressed as the current energy storage capacity and the maximum capacity that the energy storage device can store. Ratio:

[0030]

[0031] in, They represent the maximum and minimum charges of the energy storage device respectively.

[0032] An electronic device described in the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, any one of the methods for discrete charging and discharging power modeling of electric energy storage is implemented.

[0033] A storage medium described in the present invention stores a computer program, characterized in that when the computer program is executed by a processor, any one of the methods for modeling discrete charging and discharging power of electric energy storage is implemented.

[0034] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the charging and discharging power of the energy storage is discretized and modeled according to the adjustment step size, and the minimum continuous stable operation time constraint of the charging and discharging is increased, which can minimize the number of actions of the lithium battery device, improve the service life of the overall system, and reduce the probability of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The result curve of the traditional energy storage continuous charge and discharge model of the present invention;

[0036] Figure 2 It is the result curve of the energy storage continuous charge and discharge model of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a method for modeling discrete charging and discharging power of electric energy storage, comprising the following steps:

[0039] (1) Obtaining the operating parameters of the electric energy storage; the operating parameters of the electric energy storage include the electric energy storage capacity, the initial energy storage capacity, the upper and lower limits of the charge, and the continuous operation hours of charging and discharging;

[0040] (2) According to the maximum AGC command adjustment step and the maximum charge and discharge rate of the energy storage, the energy storage power adjustment step is set, and the energy storage discrete charge and discharge power set is determined; specifically, the energy storage charge and discharge power sets are:

[0041]

[0042] Among them, P c , P d Respectively represent the charging and discharging power of the electric energy storage; △p c , △p d They respectively represent the adjustment step length of the charging and discharging power of the electric energy storage; Respectively represent the multiples of the charging and discharging power adjustment step length of the energy storage; M c 、N d Respectively represent the maximum step length multiples of charge and discharge; They represent the maximum charge and discharge rates of the energy storage.

[0043] (3) Construct a discrete charging and discharging power model for energy storage, so that the charging and discharging power plan is more in line with the actual production and operation needs. The details are as follows: the charging and discharging power of energy storage can only be in one gear in the set in the same time period, the energy storage cannot be charged and discharged at the same time in adjacent time periods, one charging and discharging gear of the energy storage must be continuously operated for a period of time, and conventional constraints.

[0044] The formula for the charging and discharging power of the energy storage can only be in one gear in the set during the same period is as follows:

[0045]

[0046]

[0047] Among them, the introduction of 0 / 1 integer variables Indicates that the charging power of the energy storage is at the mth gear in the charging power set during the t period; introduces a 0 / 1 integer variable Indicates that the discharge power of the energy storage is at the nth level in the discharge power set during the t period; introduces a 0 / 1 integer variable It means that the energy storage is neither charged nor discharged during the period t.

[0048] The formula for the energy storage system not to be charged and discharged simultaneously during adjacent periods is as follows:

[0049]

[0050] Among them, M c 、N d Respectively represent the maximum step length multiples of charge and discharge; Respectively represent that the charging power of the energy storage is at the mth gear in the charging power set during the t period and the t+1 period; introduce 0 / 1 integer variables They respectively indicate that the discharge power of the energy storage in time period t and time period t+1 is at the nth level in the discharge power set.

[0051] Furthermore, the formula for the period of time that a charging and discharging gear of energy storage needs to run continuously is as follows:

[0052]

[0053] in, They respectively represent the minimum continuous operating time of a charging and discharging gear of the energy storage.

[0054] The specific conventional constraints are: the charging and discharging power in each period must meet the upper and lower limit constraints:

[0055]

[0056] In the formula, Respectively represent the maximum and minimum charging rates of electric energy storage; They represent the maximum and minimum discharge rates of the energy storage respectively.

[0057] The remaining capacity of the energy storage at time t is related to time t-1:

[0058]

[0059] Among them, E es,t is the remaining power in the energy storage device at time t, and They are the power output and the amount of electricity absorbed by the energy storage device to the grid during time period t, α and β represent the charge and discharge conversion rates, and △t is the charge and discharge period.

[0060] The battery status of the energy storage system is expressed by the state of charge SOC, and its calculation formula is as follows. SOC is expressed as the current energy storage capacity and the maximum capacity that the energy storage device can store. Ratio:

[0061]

[0062] in, They represent the maximum and minimum charges of the energy storage device respectively.

[0063] Depend on Figure 1 and Figure 2 By comparison, it can be seen that under similar energy storage power curves, that is, scenarios similar to grid power interactions, the present invention proposes a discrete charging and discharging power modeling method for electric energy storage, performs discretization modeling according to the adjustment step size, increases the minimum continuous stable operation time constraint for charging and discharging, smoothes the energy storage charging and discharging power curve, reduces the number of continuous charging and discharging actions of the energy storage device, and suppresses the generation of "jumps" and "burrs" in charging and discharging power, so that the energy storage charging and discharging power plan issued by the grid is more in line with actual production and operation needs, thereby improving the executability of the electric energy storage clearing results.

[0064] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, any one of the methods for modeling discrete charging and discharging power of electric energy storage is implemented.

[0065] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program, when executed by a processor, implements any one of the methods for modeling discrete charging and discharging power of electric energy storage.

Claims

1. A method for modeling discrete charge and discharge power of electric energy storage, characterized in that: The following steps are involved: (1) Obtaining electric energy storage operating parameters; (2) according to the maximum AGC command adjustment step and the maximum charge and discharge rate of the energy storage, the energy storage power adjustment step is set, and the discrete charge and discharge power set of the energy storage is determined; (3) Construct a discrete charging and discharging power model for electric energy storage, so that the charging and discharging power plan is more in line with the actual production and operation needs.

2. A method for modeling discrete charge and discharge power of electric energy storage according to claim 1, characterized in that: In step (1), the electric energy storage operation parameters include the electric energy storage capacity, the initial energy storage capacity, the upper and lower limits of the charge, and the continuous operation hours of charging and discharging.

3. A method for modeling discrete charge and discharge power of electric energy storage according to claim 1, characterized in that: Step (2) is as follows: The energy storage charging and discharging power sets are respectively: Among them, P c , P d Respectively represent the charging and discharging power of the electric energy storage; △p c , △p d They respectively represent the adjustment step length of the charging and discharging power of the electric energy storage; Respectively represent the multiples of the charging and discharging power adjustment step length of the energy storage; M c 、N d Respectively represent the maximum step length multiples of charge and discharge; They represent the maximum charge and discharge rates of the energy storage.

4. A method for modeling discrete charge and discharge power of electric energy storage according to claim 1, characterized in that: Step (3) is specifically as follows: including: the charging and discharging power of the energy storage can only be in one gear in the set in the same time period, the energy storage cannot be charged and discharged simultaneously in adjacent time periods, one charging and discharging gear of the energy storage must be continuously operated for a period of time, and conventional constraints.

5. A method for modeling discrete charge and discharge power of electric energy storage according to claim 4, characterized in that: The formula for the charging and discharging power of the energy storage can only be in one gear in the set during the same period is as follows: Among them, the introduction of 0 / 1 integer variables Indicates that the charging power of the energy storage is at the mth gear in the charging power set during the t period; introduces a 0 / 1 integer variable Indicates that the discharge power of the energy storage is at the nth level in the discharge power set during the t period; introduces a 0 / 1 integer variable It means that the energy storage is neither charged nor discharged during the period t.

6. A method for modeling discrete charge and discharge power of electric energy storage according to claim 4, characterized in that: The formula for the energy storage system not to be charged and discharged simultaneously during adjacent periods is as follows: Among them, M c 、N d Respectively represent the maximum step length multiples of charge and discharge; Respectively represent that the charging power of the energy storage is at the mth gear in the charging power set during the t period and the t+1 period; introduce 0 / 1 integer variables They respectively indicate that the discharge power of the energy storage in time period t and time period t+1 is at the nth level in the discharge power set.

7. A method for modeling discrete charge and discharge power of electric energy storage according to claim 4, characterized in that: The formula for the period of time that a charging and discharging gear of energy storage needs to run continuously is as follows: in, They respectively represent the minimum continuous operating time of a charging and discharging gear of the energy storage.

8. A method for modeling discrete charge and discharge power of electric energy storage according to claim 4, characterized in that: The specific conventional constraints are: the charging and discharging power in each period must meet the upper and lower limit constraints: In the formula, Respectively represent the maximum and minimum charging rates of electric energy storage; They represent the maximum and minimum discharge rates of the energy storage respectively. The remaining capacity of the energy storage at time t is related to time t-1: Among them, E es,t is the remaining power in the energy storage device at time t, and They are the power output and the amount of electricity absorbed by the energy storage device to the grid during time period t, α and β represent the charge and discharge conversion rates, and △t is the charge and discharge period. The battery status of the energy storage system is expressed by the state of charge SOC, and its calculation formula is as follows. SOC is expressed as the current energy storage capacity and the maximum capacity that the energy storage device can store. Ratio: in, They represent the maximum and minimum charges of the energy storage device respectively.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is loaded into the processor, it implements a method for modeling discrete charging and discharging power of electric energy storage according to any one of claims 1 to 7.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a discrete charging and discharging power modeling method for electric energy storage is implemented according to any one of claims 1 to 7.

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