CN111983493B - Aging test method and device for energy storage system and energy storage system - Google Patents
Aging test method and device for energy storage system and energy storage system Download PDFInfo
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- CN111983493B CN111983493B CN201910440829.6A CN201910440829A CN111983493B CN 111983493 B CN111983493 B CN 111983493B CN 201910440829 A CN201910440829 A CN 201910440829A CN 111983493 B CN111983493 B CN 111983493B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention provides an aging test method and device for an energy storage system and the energy storage system, wherein the aging test method for the energy storage system comprises the following steps: dividing the energy storage system into A, B two groups of energy storage modules; controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B; controlling the energy storage modules in the group B to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group B and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group A; recording the aging test time of the energy storage system; and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished. According to the method, the aging test of the energy storage system is not required to be carried out by externally connecting the energy storage system with a high-power variable-frequency alternating-current power supply, so that the production cost of an enterprise is saved.
Description
Technical Field
The invention belongs to the technical field of energy storage systems, and particularly relates to an aging test method and device of an energy storage system and the energy storage system.
Background
With the development of large energy storage systems, the application of the upper megawatt energy storage system is more and more extensive, however, the aging test problem of the large energy storage system follows. In the related art, the energy storage system is externally connected with the high-power variable-frequency alternating-current power supply to carry out aging test on the energy storage system, but the high-power variable-frequency alternating-current power supply is expensive, and the method for carrying out aging test on the energy storage system can increase the production cost of enterprises.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first objective of the present invention is to provide an aging test method for an energy storage system, which uses the electric energy of the energy storage system to perform an aging test on the energy storage system, and does not need to connect a high-power variable-frequency ac power supply to the energy storage system for performing the aging test on the energy storage system, thereby saving the production cost of an enterprise.
The second purpose of the invention is to provide an aging test device of an energy storage system.
A third object of the present invention is to provide an energy storage system.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
A fifth object of the invention is to propose a computer program product.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for aging test of an energy storage system, including:
step 1: dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminals of the A group of energy storage modules are electrically connected to the positive terminals of the B group of energy storage modules, and the negative terminals of the A group of energy storage modules are electrically connected to the negative terminals of the B group of energy storage modules;
step 2: controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B;
and step 3: when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A;
and 4, step 4: when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time;
and 5: and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished.
According to the aging test method of the energy storage system, the energy storage system is divided into A, B two groups of energy storage modules, wherein the positive end of the group A of energy storage modules is electrically connected to the positive end of the group B of energy storage modules, and the negative end of the group A of energy storage modules is electrically connected to the negative end of the group B of energy storage modules; controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B; when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A; when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time; and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished. In this embodiment, the energy storage system is divided into two groups of energy storage modules, one group of energy storage modules can operate at a constant voltage to perform an on-load aging test, and the other group of energy storage modules performs a charge-discharge aging test according to the output voltage of the one group of energy storage modules operating at the constant voltage.
In addition, the aging test method for the energy storage system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, when the sum of the aging test time of the energy storage system is less than the target aging test time, the steps 2, 3 and 4 are repeatedly executed until the aging test time of the energy storage system is greater than or equal to the target aging test time.
According to an embodiment of the present invention, the controlling the energy storage modules in group a to output different target voltages to perform an on-load aging test on the energy storage modules in group a and perform a charging and discharging aging test on the energy storage modules in group B at the same time includes:
step 2.1: controlling the group A energy storage modules to output different target voltages;
step 2.2: judging whether the target voltage output by the group A energy storage module is greater than a preset voltage or not;
step 2.3: when the target voltage output by the group A energy storage modules is greater than the preset voltage, the group A energy storage modules are subjected to on-load aging test, the group B energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the group A energy storage modules is less than the preset voltage, the group A energy storage modules are subjected to on-load aging test and the group B energy storage modules are subjected to discharging function aging test at the same time.
According to an embodiment of the present invention, after the group a energy storage modules complete the on-load aging test and the group B energy storage modules complete the charge and discharge function aging test, the controlling the group B energy storage modules to output different target voltages to perform the on-load aging test on the group B energy storage modules and perform the charge and discharge function aging test on the group a energy storage modules includes:
step 3.1: controlling the group B of energy storage modules to output different target voltages;
step 3.2: judging whether the target voltage output by the group B of energy storage modules is greater than the preset voltage or not;
step 3.3: when the target voltage output by the B group of energy storage modules is greater than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, the A group of energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the B group of energy storage modules is less than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, and the A group of energy storage modules are subjected to discharging function aging test at the same time.
According to one embodiment of the invention, the predetermined voltage is determined according to a rated voltage at which the energy storage system operates.
According to one embodiment of the invention, in the aging test process of the energy storage system, the aging test result of the energy storage system is recorded in real time.
According to one embodiment of the invention, the aging test result of the energy storage system comprises the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the energy storage modules in the group A, and the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the energy storage modules in the group B.
According to one embodiment of the invention, the aging test result of the energy storage system is automatically stored at regular time.
According to one embodiment of the invention, when the group A energy storage modules or the group B energy storage modules are subjected to fault elimination, the aging test of the energy storage system is continuously completed from the aging test which is not completed due to the last fault.
In order to achieve the above object, a second embodiment of the present invention provides a device for testing aging of an energy storage system, including: the energy storage system comprises a setting unit, a control unit and a control unit, wherein the setting unit is used for dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminal of the group A of energy storage modules is electrically connected to the positive terminal of the group B of energy storage modules, and the negative terminal of the group A of energy storage modules is electrically connected to the negative terminal of the group B of energy storage modules; the control unit is used for controlling the energy storage modules of the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group B, and is also used for controlling the energy storage modules of the group B to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group B and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group A after the energy storage modules of the group A complete the charging and discharging function aging test; the timing unit is used for recording the aging test time of the energy storage system; the judging unit is used for judging whether the aging test time of the energy storage system is greater than or equal to the target aging test time or not, and when the aging test time of the energy storage system is greater than or equal to the target aging test time, the aging test of the energy storage system is marked to be completed.
According to the aging test device of the energy storage system, the aging test is performed on the energy storage system by using the electric energy of the energy storage system, the energy storage system is not required to be externally connected with a high-power variable-frequency alternating-current power supply, and the production cost of an enterprise is saved.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an energy storage system applying the aging test method for an energy storage system, including: the energy storage device comprises a bus bar and a plurality of energy storage units, wherein the plurality of energy storage units are electrically connected to the bus bar.
According to the energy storage system provided by the embodiment of the invention, by applying the aging test method of the energy storage system, in the aging test process of the energy storage system, the energy storage system does not need to be externally connected with a high-power variable-frequency alternating-current power supply to carry out aging test on the energy storage system, so that the production cost of an enterprise is saved.
According to one embodiment of the invention, the energy storage unit comprises: the energy storage device comprises an energy storage element and a current converter, wherein one end of the current converter is connected with the bus bar, and the other end of the current converter is connected with the energy storage element.
According to one embodiment of the invention, the energy storage element is a battery or a capacitor.
According to one embodiment of the invention, the converter is a bidirectional DC-DC converter.
To achieve the above object, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the aging test method for an energy storage system as described above.
To achieve the above object, an embodiment of a fifth aspect of the present invention provides a computer program product, wherein when the instructions of the computer program product are executed by a processor, the method for aging testing of an energy storage system as described above is performed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a topology diagram of an aging test of an energy storage system in the related art;
FIG. 2 is a topology diagram of an aging test of an energy storage system according to an embodiment of the invention;
fig. 3 is a schematic flowchart of a first aging test method for an energy storage system according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a second aging testing method for an energy storage system according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a third aging testing method for an energy storage system according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a fourth aging testing method for an energy storage system according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a fifth aging testing method for an energy storage system according to an embodiment of the present invention;
FIG. 8 is a topology diagram of an energy storage system of one embodiment of the present invention;
fig. 9 is a schematic structural diagram of a degradation testing apparatus of an energy storage system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the related art, a common aging test method for an energy storage system is to construct an aging test topology by using a high-power variable-frequency alternating-current power supply, so as to perform an aging test on the energy storage system. Specifically, as shown in fig. 1, the aging test topology of the energy storage system includes a high-power variable-frequency alternating-current power supply, where the high-power variable-frequency alternating-current power supply includes an AC-DC converter, an alternating-current end of the AC-DC converter is connected into a power grid, and a direct-current end of the AC-DC converter is connected into a bus bar; the aging test topology of the energy storage system further comprises 6 energy storage units, the 6 energy storage units are connected into the bus bar in parallel, and each energy storage unit comprises a battery and a bidirectional DC-DC converter which are connected in series. The method for carrying out aging test on the energy storage system by adopting the aging test topology comprises the steps of controlling a high-power variable-frequency alternating-current power supply to operate at a constant voltage so as to carry out charge-discharge function aging test on the energy storage unit; and controlling the high-power variable-frequency alternating current power supply to run at a constant current so as to test the on-load aging function of the energy storage unit.
However, the method needs to purchase a high-power variable-frequency alternating-current power supply, which is expensive and occupies a large area; in addition, the maximum ac power in the market is about 500KW, and the burn-in test method becomes a bottleneck in productivity if the product productivity is sufficient.
Therefore, the invention provides an aging test method and device of an energy storage system and the energy storage system.
The following describes a method and an apparatus for aging test of an energy storage system, and an energy storage system according to an embodiment of the present invention with reference to the drawings.
As shown in fig. 2, the aging test topology of the energy storage system according to an embodiment of the present invention includes an a group of energy storage modules and a B group of energy storage modules, wherein a positive terminal of the a group of energy storage modules is electrically connected to a positive terminal of the B group of energy storage modules, and a negative terminal of the a group of energy storage modules is electrically connected to a negative terminal of the B group of energy storage modules, wherein the a group of energy storage modules includes an energy storage unit 2, an energy storage unit 4, and an energy storage unit 6, the energy storage unit 2, the energy storage unit 4, and the energy storage unit 6 are connected in parallel to a bus bar, the B group of energy storage modules includes an energy storage unit 1, an energy storage unit 3, and an energy storage unit 5, and the energy storage unit 1, the energy storage unit 3, and the energy storage unit 5 are connected in parallel to the bus bar. It should be noted that the group a energy storage module is not limited to include 3 energy storage units, but may also include 1 energy storage unit, 2 energy storage units, 4 energy storage units, and the like, and similarly, the group B energy storage module is not limited to include 3 energy storage units, but may also include 1 energy storage unit, 2 energy storage units, 4 energy storage units, and the like; and the number of the energy storage units of the group A of energy storage modules is not required to be consistent with that of the group B of energy storage modules.
Specifically, each energy storage unit includes a bidirectional DC-DC converter having one end connected to the battery and the other end connected to the bus bar.
Fig. 3 shows a method for performing an aging test on an energy storage system by using the aging test topological graph, where the aging test method for the energy storage system includes the following steps:
step 1: and dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminals of the A group of energy storage modules are electrically connected to the positive terminals of the B group of energy storage modules, and the negative terminals of the A group of energy storage modules are electrically connected to the negative terminals of the B group of energy storage modules.
In the embodiment of the invention, the energy storage system can be artificially divided into A, B two groups of energy storage modules, the positive terminal of the group a of energy storage modules is electrically connected to the positive terminal of the group B of energy storage modules, and the negative terminal of the group a of energy storage modules is electrically connected to the negative terminal of the group B of energy storage modules; the energy storage system can be divided into A, B two groups of energy storage modules by the setting unit of the aging test device of the energy storage system, the positive terminal of the group A of energy storage modules is electrically connected to the positive terminal of the group B of energy storage modules, and the negative terminal of the group A of energy storage modules is electrically connected to the negative terminal of the group B of energy storage modules.
Step 2: and controlling the energy storage modules of the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group B.
In the embodiment of the invention, the group a energy storage modules are controlled to operate at a constant voltage, in other words, the group a energy storage modules are controlled to output different target voltages, and at the moment, the group B energy storage modules are equivalent to the loads of the group a energy storage modules, so that the group a energy storage modules are subjected to an on-load aging test; it should be noted that the constant voltage operation does not mean that the group a energy storage modules always output a constant voltage, which means that the group a energy storage modules output different target voltages at different times, for example, the time for controlling the group a energy storage modules to operate at a constant voltage is T1, the time for controlling the group a energy storage modules to operate at a constant voltage is 1600V, the time for controlling the group a energy storage modules to operate at a constant voltage is T2, and the time for controlling the group a energy storage modules to operate at a constant voltage is 1400V, where T is T1+ T2.
And step 3: when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, the energy storage modules of the group B are controlled to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A.
In the embodiment of the invention, the group B energy storage modules are controlled to operate at a constant voltage, in other words, the group B energy storage modules are controlled to output different target voltages so as to carry out an on-load aging test on the group B energy storage modules and simultaneously carry out a charge-discharge function aging test on the group A energy storage modules; it should be noted that the energy storage modules in group B operate in a constant voltage manner in the same manner as the energy storage modules in group a.
And 4, step 4: and when the energy storage modules of the group B complete the on-load aging test and the energy storage modules of the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules of the group A and the charging and discharging function aging test time.
In the embodiment of the invention, the time of the on-load aging test of the group A energy storage modules and the time of the on-load aging test of the group B energy storage modules can be preset, correspondingly, the time of the charge and discharge function aging test of the group B energy storage modules and the time of the charge and discharge function aging test of the group A energy storage modules are also determined, and when the on-load aging test and the charge and discharge function aging test of the group A energy storage modules and the group B energy storage modules are finished, the aging test time of the energy storage system can be counted; it should be noted that the sum of the time of the on-load aging test and the time of the charging and discharging function aging test of the energy storage modules in the group a is equal to the sum of the time of the on-load aging test and the time of the charging and discharging function aging test of the energy storage modules in the group B.
And 5: and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished.
In the embodiment of the invention, when the energy storage modules in the group A and the energy storage modules in the group B complete the on-load aging test and the charging and discharging function aging test, the aging test time of the energy storage system is counted, whether the aging test time of the energy storage system is greater than or equal to the target aging test time is judged, and when the aging test time of the energy storage system is greater than or equal to the target aging test time, the completion of the aging test of the energy storage system is marked. It is noted that the target burn-in test time is determined by the specifications of the energy storage system.
Specifically, the energy storage system provided by the embodiment of the invention is applied to rail transit, the energy storage system is used for absorbing feedback energy when a train is braked through a direct current traction network and releasing energy to the direct current traction network when the train is pulled, and the target aging test time of the energy storage system is specified to be 72h in the technical requirements of the energy storage system.
According to the aging test method of the energy storage system, the energy storage system is divided into A, B two groups of energy storage modules, wherein the positive end of the group A of energy storage modules is electrically connected to the positive end of the group B of energy storage modules, and the negative end of the group A of energy storage modules is electrically connected to the negative end of the group B of energy storage modules; controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B; when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A; when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time; and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished. In this embodiment, the energy storage system is divided into two groups of energy storage modules, one group of energy storage modules can operate at a constant voltage to perform an on-load aging test, the other group of energy storage modules performs a charge-discharge aging test according to the output voltage of the constant-voltage operation of the group of energy storage modules, in other words, the energy storage system is subjected to the aging test through the electric energy of the energy storage system, the energy storage system does not need to be subjected to the aging test by being externally connected with a high-power variable-frequency alternating-current power supply, the production cost of an enterprise is reduced, and in the aging test process of the energy storage system, the occupied area is small, and the capacity bottleneck cannot be formed.
To clearly illustrate the previous embodiment, this embodiment provides another aging test method for an energy storage system, and fig. 4 is a schematic flow chart of the aging test method for a second energy storage system according to the embodiment of the present invention.
As shown in fig. 4, the aging test method of the energy storage system includes the following steps:
step 11: dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminals of the A group of energy storage modules are electrically connected to the positive terminals of the B group of energy storage modules, and the negative terminals of the A group of energy storage modules are electrically connected to the negative terminals of the B group of energy storage modules;
step 12: controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B;
step 13: when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A;
step 14: when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time;
step 15: and when the sum of the aging test time of the energy storage system is less than the target aging test time, repeatedly executing the step 2, the step 3 and the step 4 until the aging test time of the energy storage system is more than or equal to the target aging test time.
In the embodiment of the invention, in order to improve the reliability of the aging test of the energy storage system, the aging test of the energy storage system does not need to be completed once, in other words, the aging test of the energy storage system can be performed for multiple times until the aging test time of the energy storage system reaches the target aging test time.
Specifically, within a preset first aging test time t1, the group a energy storage modules are controlled to output different target voltages to perform an on-load aging test on the group a energy storage modules, and simultaneously perform a charging and discharging function aging test on the group B energy storage modules, after the group a energy storage modules complete the on-load aging test and the group B energy storage modules complete the charging and discharging function aging test, within a preset second aging test time t2, the group B energy storage modules are controlled to output different target voltages to perform the on-load aging test on the group B energy storage modules, and simultaneously perform the charging and discharging function aging test on the group a energy storage modules, and when the sum of t1 and t2 is less than the target aging test time, in this embodiment, the target aging test time is 72h, the above steps are repeatedly performed, that is, a third aging test time t3 is set, and controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B, setting a fourth aging test time t4, controlling the energy storage modules in the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules in the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules in the group A, and marking the completion of the aging test of the energy storage system when the sum of t1, t2, t3 and t4 is greater than or equal to 72 h. It can be understood that the aging test times of the energy storage system can be reasonably arranged according to the target aging test time until the aging test time of the energy storage system reaches the target aging test time.
According to the aging test method of the energy storage system, the energy storage system is divided into A, B two groups of energy storage modules, wherein the positive end of the group A of energy storage modules is electrically connected to the positive end of the group B of energy storage modules, and the negative end of the group A of energy storage modules is electrically connected to the negative end of the group B of energy storage modules; controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B; when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A; when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time; and when the sum of the aging test time of the energy storage system is less than the target aging test time, repeatedly executing the step 2, the step 3 and the step 4 until the aging test time of the energy storage system is more than or equal to the target aging test time. In this embodiment, the aging test times of the energy storage system can be reasonably arranged according to the target aging test time, the obtained aging test result is more accurate, the reliability of the aging test of the energy storage system is improved, the aging test of the energy storage system is performed by the electric energy of the energy storage system, the energy storage system is not required to be externally connected with a high-power variable-frequency alternating-current power supply to perform the aging test on the energy storage system, the production cost of an enterprise is reduced, in addition, the occupied area is small in the aging test process of the energy storage system, and the capacity bottleneck can not be formed.
To clearly illustrate the previous embodiment, this embodiment provides another aging test method for an energy storage system, and fig. 5 is a schematic flow chart of a third aging test method for an energy storage system according to an embodiment of the present invention.
As shown in fig. 5, the aging test method of the energy storage system includes the following steps:
step 2.1: and controlling the A group of energy storage modules to output different target voltages.
In the embodiment of the invention, the energy storage modules in the group A can output different target voltages by controlling the output voltage of each energy storage unit in the energy storage modules in the group A, for example, the bidirectional DC-DC converter of the energy storage unit can be controlled to enable the battery connected with the corresponding bidirectional DC-DC converter to output different target voltages, so that the energy storage modules in the group A can output different target voltages.
Specifically, when the target voltage output by the group a energy storage modules is determined, the operating state of the bidirectional DC-DC converter may be controlled by adjusting the duty ratio or frequency of each conducting device in the corresponding bidirectional DC-DC converter, so that the group a energy storage modules output the target voltage.
Step 2.2: and judging whether the target voltage output by the group A energy storage module is greater than the preset voltage or not.
In the embodiment of the invention, the preset voltage is determined according to the rated voltage of the energy storage system.
Specifically, the energy storage system is applied to rail transit, and the energy storage system is used for absorbing feedback energy generated during braking of the train through a direct-current traction network and releasing energy to the direct-current traction network during traction of the train, and at the moment, the rated voltage of the energy storage system is 1500V, namely the preset voltage is 1500V.
Step 2.3: when the target voltage output by the group A energy storage modules is greater than the preset voltage, the group A energy storage modules are subjected to on-load aging test, the group B energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the group A energy storage modules is less than the preset voltage, the group A energy storage modules are subjected to on-load aging test and the group B energy storage modules are subjected to discharging function aging test at the same time.
In the embodiment of the present invention, the group a energy storage modules serve as a power supply capable of providing a target voltage, the group B energy storage modules are equivalent to a load, the target voltage output by the group a energy storage modules includes 1600V and 1400V, when the target voltage output by the group a energy storage modules is 1600V, the group a energy storage modules are subjected to an on-load aging test, and the group B energy storage modules are simultaneously subjected to a charging function aging test, and when the target voltage output by the group a energy storage modules is 1400V, the group a energy storage modules are subjected to an on-load aging test, and the group B energy storage modules are simultaneously subjected to a discharging function aging test.
According to the aging test method of the energy storage system, the group A of energy storage modules are controlled to output different target voltages; judging whether the target voltage output by the group A energy storage module is greater than a preset voltage or not; when the target voltage output by the group A energy storage modules is greater than the preset voltage, the group A energy storage modules are subjected to on-load aging test, the group B energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the group A energy storage modules is less than the preset voltage, the group A energy storage modules are subjected to on-load aging test and the group B energy storage modules are subjected to discharging function aging test at the same time. In this embodiment, come to carry out aging testing to energy storage system through energy storage system self's electric energy, need not to carry out aging testing to energy storage system with the external high-power frequency conversion alternating current power supply of energy storage system, reduced the manufacturing cost of enterprise, and in energy storage system's aging testing process, take up an area of fewly, can not become the productivity bottleneck.
To clearly illustrate the previous embodiment, this embodiment provides another aging test method for an energy storage system, and fig. 6 is a schematic flow chart of an aging test method for a fourth energy storage system according to an embodiment of the present invention.
As shown in fig. 6, the aging test method of the energy storage system includes the following steps:
step 3.1: controlling the group B of energy storage modules to output different target voltages;
step 3.2: judging whether the target voltage output by the group B of energy storage modules is greater than a preset voltage or not;
step 3.3: when the target voltage output by the B group of energy storage modules is greater than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, the A group of energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the B group of energy storage modules is less than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, and the A group of energy storage modules are subjected to discharging function aging test at the same time.
Except for different control objects, the aging test method of the energy storage system shown in fig. 6 is to control the group B of energy storage modules to output different target voltages, and the aging test method of the energy storage system shown in fig. 5 is to control the group a of energy storage modules to output different target voltages, and other working mechanisms are substantially the same, and are not repeated herein.
To clearly illustrate the previous embodiment, this embodiment provides another aging test method for an energy storage system, and fig. 7 is a schematic flow chart of a fifth aging test method for an energy storage system according to an embodiment of the present invention.
As shown in fig. 7, the aging test method of the energy storage system includes the following steps:
step 101: and recording an aging test result of the energy storage system in real time in the aging test process of the energy storage system.
In the embodiment of the invention, the aging test result of the energy storage system comprises the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the group A of energy storage modules, the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the group B of energy storage modules, and the aging test result of the energy storage system further comprises a voltage-power data curve in the bus bar.
Step 201: and a fault protection mechanism is added, the aging test result of the energy storage system is automatically stored at regular time, and when the energy storage modules in the group A or the energy storage modules in the group B are in fault, the aging test result of the energy storage system can be stored to the aging test result of the energy storage system in a time period before the fault.
In the embodiment of the present invention, the aging test result of the energy storage system is automatically stored at regular time, in other words, the aging test result of the energy storage system is automatically stored at intervals of a time period, and when the energy storage modules in the group a or the energy storage modules in the group B fail, the aging test result of the energy storage system is stored to the aging test result in a time period before the failure.
Step 301: and judging whether the energy storage modules in the group A or the energy storage modules in the group B are in fault removal.
And when the group A energy storage modules or the group B energy storage modules are not cleared, sending a fault instruction for clearing the group A energy storage modules or the group B energy storage modules, so that the faults of the group A energy storage modules or the group B energy storage modules are cleared.
And when the failure of the group A energy storage module or the group B energy storage module is eliminated, executing the step 401.
Step 401: and when the faults of the energy storage modules in the group A or the energy storage modules in the group B are eliminated, the aging test of the energy storage system is continuously completed from the aging test with the last incomplete fault.
According to the aging test method of the energy storage system, by adding the fault protection mechanism, the aging test of the energy storage system is ensured to be carried out more reliably, the problem that the aging test result of the energy storage system is lost when the energy storage system is in fault is avoided, in addition, when the fault of the energy storage system is eliminated, namely the fault of the energy storage modules in the group A or the energy storage modules in the group B is eliminated, the aging test of the energy storage system can be continuously completed from the last unfinished aging test, and the time cost is saved.
In order to implement the above embodiment, the present application further provides an energy storage system using the aging test method for an energy storage system.
Fig. 8 is a topology diagram of an energy storage system of an embodiment of the present invention.
As shown in fig. 8, the energy storage system includes a bus bar and 6 energy storage units, each of the 6 energy storage units is electrically connected to the bus bar, each of the energy storage units includes an energy storage element and an inverter, one end of the inverter is connected to the bus bar, and the other end of the inverter is connected to the energy storage element.
In an embodiment of the invention, the converter is a bidirectional DC-DC converter, the energy storage element is a battery, and the energy storage system is applied to rail transit, and the battery can store electric energy released when a rail train brakes and can also provide electric energy for the rail train when the rail train runs.
In order to implement the above embodiment, the present application further provides an aging test apparatus for an energy storage system.
Fig. 9 is a schematic structural diagram of a degradation testing apparatus of an energy storage system according to an embodiment of the present invention.
As shown in fig. 9, the aging test apparatus for an energy storage system includes:
the energy storage system comprises a setting unit, a control unit and a control unit, wherein the setting unit is used for dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminal of the group A of energy storage modules is electrically connected to the positive terminal of the group B of energy storage modules, and the negative terminal of the group A of energy storage modules is electrically connected to the negative terminal of the group B of energy storage modules;
the control unit is used for controlling the energy storage modules of the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group B, and is also used for controlling the energy storage modules of the group B to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group B and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group A after the energy storage modules of the group A complete the charging and discharging function aging test;
the timing unit is used for recording the aging test time of the energy storage system;
the judging unit is used for judging whether the aging test time of the energy storage system is greater than or equal to the target aging test time or not, and when the aging test time of the energy storage system is greater than or equal to the target aging test time, the aging test of the energy storage system is marked to be completed.
According to the aging test device of the energy storage system, the energy storage system is divided into A, B two groups of energy storage modules, wherein the positive end of the group A of energy storage modules is electrically connected to the positive end of the group B of energy storage modules, and the negative end of the group A of energy storage modules is electrically connected to the negative end of the group B of energy storage modules; controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B; when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A; when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time; and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished. In this embodiment, the energy storage system is divided into two groups of energy storage modules, one group of energy storage modules can operate at a constant voltage to perform an on-load aging test, the other group of energy storage modules performs a charge-discharge aging test according to the output voltage of the constant-voltage operation of the group of energy storage modules, in other words, the energy storage system is subjected to the aging test through the electric energy of the energy storage system, the energy storage system does not need to be subjected to the aging test by being externally connected with a high-power variable-frequency alternating-current power supply, the production cost of an enterprise is reduced, and in the aging test process of the energy storage system, the occupied area is small, and the capacity bottleneck cannot be formed.
To achieve the above object, the present application also proposes a computer-readable storage medium.
Wherein the computer readable storage medium has stored thereon a computer program which, when being executed by a processor, is adapted to implement the control method of the auxiliary power supply system for a railway vehicle according to the embodiment of the second aspect.
In an alternative implementation, the embodiments may be implemented in any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
To achieve the above object, the present application also proposes a computer program. Wherein the computer program is executed by a processor to implement the rail vehicle auxiliary power supply system control method according to the embodiment of the second aspect.
In this application, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are to be construed broadly and include, for example, mechanical and electrical connections; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. An aging test method for an energy storage system is characterized by comprising the following steps:
step 1: dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminals of the A group of energy storage modules are electrically connected to the positive terminals of the B group of energy storage modules, and the negative terminals of the A group of energy storage modules are electrically connected to the negative terminals of the B group of energy storage modules;
step 2: controlling the energy storage modules in the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules in the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules in the group B;
and step 3: when the energy storage modules of the group A complete the on-load aging test and the energy storage modules of the group B complete the charging and discharging function aging test, controlling the energy storage modules of the group B to output different target voltages so as to carry out the on-load aging test on the energy storage modules of the group B and simultaneously carry out the charging and discharging function aging test on the energy storage modules of the group A;
and 4, step 4: when the energy storage modules in the group B complete the on-load aging test and the energy storage modules in the group A complete the charging and discharging function aging test, recording the aging test time of the energy storage system, wherein the aging test time of the energy storage system is the sum of the on-load aging test time of the energy storage modules in the group A and the charging and discharging function aging test time;
and 5: and when the aging test time of the energy storage system is greater than or equal to the target aging test time, marking that the aging test of the energy storage system is finished.
2. The aging test method for an energy storage system according to claim 1, further comprising:
and when the sum of the aging test time of the energy storage system is less than the target aging test time, repeatedly executing the step 2, the step 3 and the step 4 until the aging test time of the energy storage system is more than or equal to the target aging test time.
3. The aging test method for the energy storage system according to claim 1 or 2, wherein the controlling the energy storage modules in the group a to output different target voltages to perform an on-load aging test on the energy storage modules in the group a and simultaneously perform a charging and discharging function aging test on the energy storage modules in the group B comprises:
step 2.1: controlling the group A energy storage modules to output different target voltages;
step 2.2: judging whether the target voltage output by the group A energy storage module is greater than a preset voltage or not;
step 2.3: when the target voltage output by the group A energy storage modules is greater than the preset voltage, the group A energy storage modules are subjected to on-load aging test, the group B energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the group A energy storage modules is less than the preset voltage, the group A energy storage modules are subjected to on-load aging test and the group B energy storage modules are subjected to discharging function aging test at the same time.
4. The aging test method for the energy storage system according to claim 3, wherein after the group A of energy storage modules complete the on-load aging test and the group B of energy storage modules complete the charging and discharging function aging test, the group B of energy storage modules are controlled to output different target voltages so as to perform the on-load aging test on the group B of energy storage modules and perform the charging and discharging function aging test on the group A of energy storage modules at the same time, and the method comprises the following steps:
step 3.1: controlling the group B of energy storage modules to output different target voltages;
step 3.2: judging whether the target voltage output by the group B of energy storage modules is greater than the preset voltage or not;
step 3.3: when the target voltage output by the B group of energy storage modules is greater than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, the A group of energy storage modules are subjected to charging function aging test at the same time, and when the target voltage output by the B group of energy storage modules is less than the preset voltage, the B group of energy storage modules are subjected to on-load aging test, and the A group of energy storage modules are subjected to discharging function aging test at the same time.
5. The aging test method for the energy storage system according to claim 4, wherein the preset voltage is determined according to a rated voltage at which the energy storage system operates.
6. The aging test method for an energy storage system according to claim 1, further comprising:
and recording an aging test result of the energy storage system in real time in the aging test process of the energy storage system.
7. The aging test method for the energy storage system according to claim 6, wherein the aging test result of the energy storage system comprises the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the energy storage modules in the group A, and the highest voltage, the lowest voltage and the highest temperature of each energy storage unit in the energy storage modules in the group B.
8. The aging test method of the energy storage system according to claim 6 or 7, further comprising:
and automatically storing the aging test result of the energy storage system at regular time.
9. The aging test method for an energy storage system according to claim 8, further comprising:
and when the faults of the energy storage modules in the group A or the energy storage modules in the group B are eliminated, the aging test of the energy storage system is continuously completed from the aging test with the last incomplete fault.
10. An aging test device for an energy storage system, comprising:
the energy storage system comprises a setting unit, a control unit and a control unit, wherein the setting unit is used for dividing the energy storage system into A, B two groups of energy storage modules, wherein the positive terminal of the group A of energy storage modules is electrically connected to the positive terminal of the group B of energy storage modules, and the negative terminal of the group A of energy storage modules is electrically connected to the negative terminal of the group B of energy storage modules;
the control unit is used for controlling the energy storage modules of the group A to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group A and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group B, and is also used for controlling the energy storage modules of the group B to output different target voltages so as to carry out an on-load aging test on the energy storage modules of the group B and simultaneously carry out a charging and discharging function aging test on the energy storage modules of the group A after the energy storage modules of the group A complete the charging and discharging function aging test;
the timing unit is used for recording the aging test time of the energy storage system;
the judging unit is used for judging whether the aging test time of the energy storage system is greater than or equal to the target aging test time or not, and when the aging test time of the energy storage system is greater than or equal to the target aging test time, the aging test of the energy storage system is marked to be completed.
11. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements a method for aging testing of an energy storage system as claimed in any one of claims 1 to 9.
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