A control system for a new energy storage system

Abstract

The present invention relates to the technical field of new energy storage technology, and specifically discloses a control system of a new energy storage system, comprising the following modules: an idle time acquisition module: setting a time threshold T, and selecting an idle time period of an energy storage unit; a batching module: intersecting all idle time periods to obtain an intersection time period, and recording the energy storage units corresponding to several idle time periods whose intersection time period is greater than or equal to T as the same batch; and so on, dividing all energy storage units into several batches; a matching module: obtaining the line length between an energy storage unit in the same batch and the remaining energy storage units, and obtaining the matching degree between the energy storage units; and an electric quantity transmission module: dividing the energy storage units into several combinations according to the matching degree between the energy storage units, and in the intersection time period, the two energy storage units in the combination transmit electric quantity to each other.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy storage technology, and in particular to a control system of a new energy storage system. Background Art

[0002] New energy storage system refers to a system that uses batteries, supercapacitors, hydrogen storage and other technologies to store unstable energy such as renewable energy (such as solar energy and wind energy) for use when needed. New energy storage system can improve the utilization efficiency of renewable energy, alleviate the contradiction between energy supply and demand, and also help optimize power grid operation and improve energy security.

[0003] Energy storage control is a key link in the new energy storage system. It involves the effective storage and reasonable release of new energy electricity to ensure the stable operation of the power grid and the efficient use of energy. The energy storage control process includes battery management to ensure the service life of the battery to ensure that the energy storage system maintains good performance.

[0004] In the prior art, in a distributed new energy storage system, the storage of new energy electricity is often jointly stored by several energy storage units. However, due to different weather conditions and different power loads of users, the amount of electricity stored in each energy storage unit at different times is different, and some energy storage units may have residual electricity for a long time without charging or discharging. If the battery in the energy storage unit has too low or oversaturated electricity for a long time, natural loss will occur inside the battery, affecting the battery life. Summary of the invention

[0005] The purpose of the present invention is to provide a control system for a new energy storage system to solve the above technical problems.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A control system for a new energy storage system includes the following modules:

[0008] Idle time collection module: obtain the daily remaining power of each energy storage unit in the past few years, set a time threshold T, select the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T, and record it as the idle time period of the energy storage unit;

[0009] Batch module: intersect all idle time periods to obtain an intersection time period, and record the energy storage units corresponding to several idle time periods whose intersection time period is greater than or equal to T as the same batch; delete the intersection time period from the idle time periods of the energy storage units to obtain the remaining idle time periods of the energy storage units; intersect the remaining idle time periods of the energy storage units again to obtain a new intersection time period, and record the energy storage units corresponding to several remaining idle time periods whose new intersection time period is greater than or equal to T as the same batch; and so on, divide all energy storage units into several batches;

[0010] Matching module: set the power threshold range R, and record the rated capacity of the energy storage unit as Q; obtain the line length L between the energy storage unit in the same batch and the other energy storage units; obtain the remaining power between the energy storage units in turn, record them as Q1 and Q2 respectively; set the coefficient k, record k=1 when and only when (Q1+Q2) / 2∈R, otherwise record k=0; then get the matching degree between the energy storage units , where λ is a preset constant, α is a preset coefficient and α>1;

[0011] Power transmission module: The energy storage units are divided into several combinations according to the matching degree between each other. During the intersection time period, the two energy storage units in the combination transmit power to each other, so that the remaining power in the energy storage unit is (Q1+Q2) / 2.

[0012] As a further solution of the present invention: the process of obtaining the idle time period of the energy storage unit includes:

[0013] Obtain the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T1 in several years, recorded as [t, t0], and obtain the time period set of the energy storage unit {[t1, t 01 ],[t2,t 02 ],...,[t n , t 0n ]}, where n is the number of years, [t1, t 01 ] represents the time period of the energy storage unit in the first year;

[0014] Get the idle time period of the energy storage unit [t ave , t 0ave ],in .

[0015] As a further solution of the present invention: when there is an energy storage unit in a period of several years {[t, t0]∪[t', t0'], [t1, t 01 ]∪[t1′, t 01 '], ..., [t n , t 0n ]∪[t n ',t0n ']}, the idle time period of the energy storage unit is [t ave , t 0ave ]∪[t ave ',t 0ave '],in .

[0016] As a further solution of the present invention: the numerical range of the time threshold T is [3 months, 6 months], and the setting range of the power threshold range R is [40%Q, 60%Q].

[0017] As a further solution of the present invention: the process of dividing the energy storage units into several batches also includes:

[0018] When the batching is completed, if there is still a remaining idle time period in the energy storage unit, the remaining idle time period is recorded as [T rip , T 0rip ]; when |T 0rip -T rip |≥T, at T 0rip The remaining power in the energy storage unit is adjusted to the power threshold range at all times; when |T 0rip -T rip When |<T, no adjustment is made.

[0019] As a further solution of the present invention: the process of adjusting the remaining power in the energy storage unit to the power threshold range includes:

[0020] When the energy storage unit has an idle time period, the remaining energy storage units recorded during the idle time period are the power flow units;

[0021] In T rip The remaining power N%Q in the energy storage unit is obtained at all times, where N∈(0,100) and N is a positive integer, and the power in all power flow units is obtained, and they are sorted from small to large to obtain {q1, q2, ..., q m}, where m is the number of power flow units, and q1 represents the power in the first power flow unit;

[0022] When N%Q<40%Q, the mth power flow unit delivers (40%-N%)Q power to the energy storage unit. If q m When <(40%-N%)Q, the m-1th power flow unit continues to transmit (40%-N%)Qq to the energy storage unit. m of electricity; and so on.

[0023] As a further solution of the present invention: the process of adjusting the remaining power in the energy storage unit to the power threshold range also includes:

[0024] When N%Q≥60%Q, the energy storage unit delivers (N%-60%)Q of electricity to the first electricity flow unit. If Q-q1<(N%-60%)Q, the energy storage unit continues to deliver (N%-60%)Q-(Q-q1) of electricity to the second electricity flow unit; and so on.

[0025] As a further solution of the present invention: the process of dividing the energy storage unit into several combinations includes:

[0026] Obtain all matching degrees of the energy storage unit and the remaining energy storage units, and obtain a matching degree set {M1, M2, ..., M j}, where M1 is the matching degree between the energy storage unit and the remaining first energy storage unit, and j is the number of the remaining energy storage units;

[0027] The average matching degree of the energy storage unit is obtained , sort the energy storage units from small to large according to the average matching degree, and combine the energy storage units in sequence according to the sorting. The combination process is to record the two energy storage units with the highest matching degree as one combination.

[0028] Beneficial effects of the present invention:

[0029] In the prior art, in a distributed new energy storage system, the storage of new energy electricity is often jointly stored by several energy storage units. However, due to different weather conditions and different power loads of users, the amount of electricity stored in each energy storage unit at different times is different, and some energy storage units may have residual electricity for a long time without charging or discharging. If the battery in the energy storage unit has too low or oversaturated electricity for a long time, natural loss will occur inside the battery, affecting the battery life. Compared with the prior art, the idle time period of each energy storage unit is determined based on historical data. The idle time period is the time period when the remaining electricity in the battery does not change for more than a time threshold. The intersection time period is determined by the interval, and several energy storage units with the same intersection time period are recorded as the same batch; in the same batch of energy storage units, the matching degree between each other is obtained according to the line length and the remaining power; according to the size of the average matching, the energy storage units are grouped in order from small to large, and the two energy storage units with the highest matching degree between each other are recorded as a combination, and the two energy storage units in the combination transmit electricity to each other, so that the electricity in the two energy storage units is within the electricity threshold range, ensuring that the remaining electricity in the battery of the energy storage unit is within the optimal range when the battery is not charged or discharged for a long time. The optimal range is the electricity threshold range, which reduces the natural loss inside the battery and helps to protect the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a structural schematic diagram of a control system of a new energy storage system of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 As shown, the present invention is a control system for a new energy storage system, comprising the following modules:

[0034] Idle time collection module: obtain the daily remaining power of each energy storage unit in the past few years, set a time threshold T, select the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T, and record it as the idle time period of the energy storage unit;

[0035] It is understandable that in the distributed energy storage system of new energy, due to unstable weather conditions and differences in user power load, the remaining power of each energy storage unit will be different, and some energy storage units may be in a state of not being charged or discharged for a long time. In order to effectively manage these energy storage units and optimize the operation of the system, the idle time period of each energy storage unit in the distributed energy storage system is analyzed; by setting the time threshold T, the energy storage units whose remaining power remains unchanged for a long time are found, and these time periods are marked as idle time periods; this helps to identify units that may not need to be charged and discharged frequently, so that these units can be managed and maintained more targetedly;

[0036] The process of obtaining the idle time period of the energy storage unit includes:

[0037] Obtain the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T1 in several years, recorded as [t, t0], and obtain the time period set of the energy storage unit {[t1, t 01 ],[t2,t 02 ],...,[t n , t 0n ]}, where n is the number of years, [t1, t 01 ] represents the time period of the energy storage unit in the first year;

[0038] Get the idle time period of the energy storage unit [t ave , t 0ave ],in ;

[0039] When there is an energy storage unit in a period of several years {[t, t0]∪[t', t0'], [t1, t 01 ]∪[t1′, t 01 '], ..., [t n , t 0n ]∪[t n ',t 0n ']}, the idle time period of the energy storage unit is [t ave , t 0ave ]∪[t ave ',t 0ave '],in ;

[0040] It is understandable that the time periods during which the remaining power of each energy storage unit remains constant for more than the time threshold T in the past several years are different, so the idle time period of the energy storage unit is determined based on the average value of the time periods in the past several years;

[0041] Batch module: intersect all idle time periods to obtain an intersection time period, and record the energy storage units corresponding to several idle time periods whose intersection time period is greater than or equal to T as the same batch; delete the intersection time period from the idle time periods of the energy storage units to obtain the remaining idle time periods of the energy storage units; intersect the remaining idle time periods of the energy storage units again to obtain a new intersection time period, and record the energy storage units corresponding to several remaining idle time periods whose new intersection time period is greater than or equal to T as the same batch; and so on, divide all energy storage units into several batches;

[0042] It should be further explained that a data set containing historical remaining power data of all energy storage units is obtained, and the data is arranged in chronological order; the data of each energy storage unit is analyzed to find out the continuous time period in which its remaining power remains unchanged (or changes within a small threshold range) as the idle time period of the unit; the idle time periods of two or more energy storage units are taken to find out their common idle period, that is, the intersection time period; the energy storage units whose intersection time period is greater than or equal to the preset time threshold T are grouped into the same batch. Remove the intersection time period that has been used for grouping from the idle time period of each energy storage unit to obtain the remaining idle time period; use the remaining idle time period obtained in the previous step to calculate the new intersection time period again; repeat the steps, that is, the energy storage units corresponding to several remaining idle time periods whose new intersection time period is greater than or equal to T are recorded as the same batch, and then remove the matched idle time periods, and continue to find new intersection time periods until no intersection time period that meets the conditions can be found; after multiple rounds of iterations, all energy storage units are divided into several batches according to their idle time period characteristics; the time threshold T can be adjusted according to actual needs to optimize the batching results;

[0043] Matching module: set the power threshold range R, and record the rated capacity of the energy storage unit as Q; obtain the line length L between the energy storage unit in the same batch and the other energy storage units; obtain the remaining power between the energy storage units in turn, record them as Q1 and Q2 respectively; set the coefficient k, record k=1 when and only when (Q1+Q2) / 2∈R, otherwise record k=0; then get the matching degree between the energy storage units , where λ is a preset constant, α is a preset coefficient and α>1;

[0044] It should be further explained that in the matching degree calculation formula, λ is a preset constant. Indicates the absolute value of the difference between the average value of the remaining power of the two energy storage units and 50%Q, where 50%Q is the median value of the power threshold range. The larger the value, the more the remaining power of the two energy storage units matches. The bigger;

[0045] It is worth noting that when two energy storage units transmit electricity, there must be line loss in the line. The line loss is mainly due to the fact that when the current passes through the wire, the resistance of the wire will consume electrical energy and generate heat. This part of energy is the line loss. The length of the line directly affects the size of the resistance, thereby affecting the degree of loss. The shorter the line, the smaller the line loss; then α / L means that the shorter the line length between the two energy storage units, the better the match between the two energy storage units; the preset coefficient α is obtained from experimental data;

[0046] It can be understood that the purpose of matching the two energy storage units is to complement the remaining power in the two energy storage units so that the remaining power of the two energy storage units in the intersection time period is within the power threshold range; therefore, when (Q1+Q2) / 2∉R between the two energy storage units, the two energy storage units do not meet the matching conditions, and the matching degree M between the two energy storage units is 0;

[0047] The value range of the time threshold T is [3 months, 6 months], and the setting range of the power threshold range R is [40%Q, 60%Q];

[0048] It is worth noting that long-term storage usually refers to a period of more than 6 months. During this period, if the battery is not properly maintained, its performance may deteriorate due to self-discharge and other reasons. Discharge maintenance should be performed every 3 months, and each discharge time should not exceed half an hour. Such maintenance can check the actual capacity of the battery and help calibrate the battery's fuel gauge to ensure that it displays accurately. Therefore, the value range of the time threshold T is [3months, 6months].

[0049] It is worth noting that the best use state of the battery, that is, the state with the longest cycle life, is usually when the power is maintained between 40% and 60%; this range is considered to be the "golden range" of the battery, because in this state, the internal pressure of the battery is relatively low and the electrochemical reaction is more stable; in addition, if the battery needs to be stored for a long time, it is recommended to charge it to about 60% of the power, which can reduce the natural loss of the battery and extend its service life; in order to minimize the impact on the battery life, the battery power should be maintained within the range of 40% to 60%, and avoid being placed in a fully charged or empty state for a long time; at the same time, paying attention to temperature control and regular charging and discharging maintenance can effectively extend the service life of the battery; therefore, the setting range of the power threshold range R is [40%Q, 60%Q];

[0050] The process of dividing the energy storage units into several batches also includes:

[0051] When the batching is completed, if there is still a remaining idle time period in the energy storage unit, the remaining idle time period is recorded as [T rip , T 0rip ]; when |T 0rip -T rip |≥T, at T 0rip The remaining power in the energy storage unit is adjusted to the power threshold range at all times; when |T 0rip -T rip When |<T, no adjustment is made;

[0052] The process of adjusting the remaining power in the energy storage unit to the power threshold range includes:

[0053] When the energy storage unit has an idle time period, the remaining energy storage units recorded during the idle time period are the power flow units;

[0054] In T rip The remaining power N%Q in the energy storage unit is obtained at all times, where N∈(0,100) and N is a positive integer, and the power in all power flow units is obtained, and they are sorted from small to large to obtain {q1, q2, ..., q m}, where m is the number of power flow units, and q1 represents the power in the first power flow unit;

[0055] When N%Q<40%Q, the mth power flow unit delivers (40%-N%)Q power to the energy storage unit. If q m When <(40%-N%)Q, the m-1th power flow unit continues to transmit (40%-N%)Qq to the energy storage unit. m of electricity; and so on;

[0056] The process of adjusting the remaining power in the energy storage unit to the power threshold range also includes:

[0057] When N%Q≥60%Q, the energy storage unit delivers (N%-60%)Q of electricity to the first electricity flow unit. If Q-q1<(N%-60%)Q, the energy storage unit continues to deliver (N%-60%)Q-(Q-q1) of electricity to the second electricity flow unit; and so on.

[0058] It is understandable that after the batching is completed, if there are still remaining idle time periods in the energy storage unit, and the length of these time periods is greater than or equal to the preset time threshold T, then some measures can be taken to optimize the management of the energy storage unit; for each energy storage unit, record its remaining idle time period [T rip , T 0rip ], where T rip is the start time of the idle time period, T 0rip is the end time; calculate the length of each remaining idle time period, that is, |T 0rip -T rip |. If this time length is greater than or equal to the preset time threshold T, it is considered that the time period is long enough and can be further adjusted;

[0059] Power transmission module: The energy storage units are divided into several combinations according to the matching degree between each other. During the intersection time period, the two energy storage units in the combination transmit power to each other, so that the remaining power in the energy storage units is (Q1+Q2) / 2.

[0060] The process of dividing the energy storage unit into a plurality of combinations includes:

[0061] Obtain all matching degrees of the energy storage unit and the remaining energy storage units, and obtain a matching degree set {M1, M2, ..., M j}, where M1 is the matching degree between the energy storage unit and the remaining first energy storage unit, and j is the number of the remaining energy storage units;

[0062] The average matching degree of the energy storage unit is obtained , sorting the energy storage units from small to large according to the average matching degree, and combining the energy storage units in sequence according to the sorting, wherein the combination process is to record the two energy storage units with the highest matching degree between each other as one combination;

[0063] It is worth noting that in order to ensure that as many energy storage units as possible can form a combination, grouping is started from the energy storage unit with the lowest average matching degree; this method is to prevent the situation where multiple remaining energy storage units cannot be grouped due to preferential selection; and for the energy storage units remaining after the grouping is completed, the remaining power in the energy storage units remaining after the grouping is completed is adjusted according to the above steps of adjusting the remaining power in the energy storage units that still have remaining idle time periods after the batching is completed.

[0064] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A control system for a new energy storage system, characterized in that: Includes the following modules: Idle time collection module: obtain the daily remaining power of each energy storage unit in the past few years, set a time threshold T, select the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T, and record it as the idle time period of the energy storage unit; Batch module: intersect all idle time periods to obtain an intersection time period, and record the energy storage units corresponding to several idle time periods whose intersection time period is greater than or equal to T as the same batch; delete the intersection time period from the idle time periods of the energy storage units to obtain the remaining idle time periods of the energy storage units; intersect the remaining idle time periods of the energy storage units again to obtain a new intersection time period, and record the energy storage units corresponding to several remaining idle time periods whose new intersection time period is greater than or equal to T as the same batch; and so on, divide all energy storage units into several batches; Matching module: set the power threshold range R, and record the rated capacity of the energy storage unit as Q; obtain the line length L between the energy storage unit in the same batch and the other energy storage units; obtain the remaining power between the energy storage units in turn, record them as Q1 and Q2 respectively; set the coefficient k, record k=1 when and only when (Q1+Q2) / 2∈R, otherwise record k=0; then get the matching degree between the energy storage units , where λ is a preset constant, α is a preset coefficient and α>1; Power transmission module: The energy storage units are divided into several combinations according to the matching degree between each other. During the intersection time period, the two energy storage units in the combination transmit power to each other, so that the remaining power in the energy storage units is (Q1+Q2) / 2. The process of dividing the energy storage units into several batches also includes: When the batching is completed, if there is still a remaining idle time period in the energy storage unit, the remaining idle time period is recorded as [T rip , T 0rip ]; when |T 0rip -T rip |≥T, at T 0rip The remaining power in the energy storage unit is adjusted to the power threshold range at all times; when |T 0rip -T rip When |<T, no adjustment is made; The process of adjusting the remaining power in the energy storage unit to the power threshold range includes: When the energy storage unit has an idle time period, the remaining energy storage units recorded during the idle time period are the power flow units; In T rip The remaining power N%Q in the energy storage unit is obtained at all times, where N∈(0,100) and N is a positive integer, and the power in all power flow units is obtained, and they are sorted from small to large to obtain {q1, q2, ..., q m }, where m is the number of power flow units, and q1 represents the power in the first power flow unit; When N%Q<40%Q, the mth power flow unit delivers (40%-N%)Q power to the energy storage unit. If q m When <(40%-N%)Q, the m-1th power flow unit continues to transmit (40%-N%)Qq to the energy storage unit. m of electricity; and so on; The process of adjusting the remaining power in the energy storage unit to the power threshold range also includes: When N%Q≥60%Q, the energy storage unit delivers (N%-60%)Q of electricity to the first electricity flow unit. If Q-q1<(N%-60%)Q, the energy storage unit continues to deliver (N%-60%)Q-(Q-q1) of electricity to the second electricity flow unit; and so on.

2. The control system of a new energy storage system according to claim 1, characterized in that: The process of obtaining the idle time period of the energy storage unit includes: Obtain the time period in which the remaining power of the energy storage unit remains unchanged for a period greater than T1 in several years, recorded as [t, t0], and obtain the time period set of the energy storage unit {[t1, t 01 ],[t2,t 02 ],...,[t n , t 0n ]}, where n is the number of years, [t1, t 01 ] represents the time period of the energy storage unit in the first year; Get the idle time period of the energy storage unit [t ave , t 0ave ],in , .

3. The control system of a new energy storage system according to claim 2, characterized in that: When there is an energy storage unit in a period of several years [t1, t 01 ]∪[t1′, t 01 '], ..., [t n , t 0n ]∪[t n ',t 0n ']}, the idle time period of the energy storage unit is [t ave , t 0ave ]∪[t ave ',t 0ave '],in , , , .

4. The control system of a new energy storage system according to claim 1, characterized in that: The value range of the time threshold T is [3 months, 6 months], and the setting range of the power threshold range R is [40%Q, 60%Q].

5. The control system of a new energy storage system according to claim 1, characterized in that: The process of dividing the energy storage unit into a plurality of combinations includes: Obtain all matching degrees of the energy storage unit and the remaining energy storage units, and obtain a matching degree set {M1, M2, ..., M j }, where M1 is the matching degree between the energy storage unit and the remaining first energy storage unit, and j is the number of the remaining energy storage units; The average matching degree of the energy storage unit is obtained , sort the energy storage units from small to large according to the average matching degree, and combine the energy storage units in sequence according to the sorting. The combination process is to record the two energy storage units with the highest matching degree as one combination.

Images