Energy storage system detection method, device, computer equipment and storage medium

Abstract

The present application provides an energy storage system detection method, device, computer equipment and storage medium, wherein, based on the performance information of the electrochemical energy storage system, test specification data for use in detecting the electrochemical energy storage system is determined from a preset test specification database; for each of the at least one charging frequency value, the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through a power grid simulation device; after the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device, it is determined whether the electrochemical energy storage system and the power grid simulation device are disconnected; if so, the state of the electrochemical energy storage system is marked as abnormal. The above method is used to detect the state of the electrochemical energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of electric energy storage technology, and in particular to an energy storage system detection method, device, computer equipment and storage medium. Background Art

[0002] With the rapid development of energy storage technology, large-scale energy storage systems have become an important means of ensuring the reliable operation of power systems. Energy storage technology not only improves the operating efficiency of power equipment and reduces power supply costs, but also promotes the absorption of new energy sources and improves the stability and reliability of power grid operations. There are many ways to store energy, among which electrochemical energy storage, which stores or releases electrical energy through reversible chemical reactions, has the characteristics of high energy density, high conversion efficiency, short construction period, and strong site adaptability. It has been widely used in power systems.

[0003] The inventors discovered during their research that since the state of an electrochemical energy storage system may change depending on its age, operating environment, and other factors, and may result in abnormalities, if the electrochemical energy storage system is directly enabled without detecting its operating state, the electrochemical energy storage system may not function properly or may not be able to operate stably in the power grid. Therefore, how to detect the state of the electrochemical energy storage system has become an urgent problem to be solved. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide an energy storage system detection method, apparatus, computer equipment and storage medium to detect the status of an electrochemical energy storage system.

[0005] In a first aspect, an embodiment of the present application provides a method for detecting an energy storage system, the method comprising:

[0006] Determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration;

[0007] For each of the at least one charging frequency value, charging the electrochemical energy storage system for the target charging duration at the frequency of the charging frequency value using a power grid simulation device;

[0008] Determining whether the electrochemical energy storage system is disconnected from the grid simulation device after charging the electrochemical energy storage system for the target charging time at the charging frequency value through the grid simulation device;

[0009] If the electrochemical energy storage system is disconnected from the grid simulation device after the grid simulation device charges the electrochemical energy storage system at the charging frequency value for the target charging time, the state of the electrochemical energy storage system is marked as abnormal.

[0010] Optionally, after determining whether the electrochemical energy storage system is disconnected from the grid simulation device after charging the electrochemical energy storage system for the target charging time at the charging frequency value through the grid simulation device, the method further includes:

[0011] If, after the electrochemical energy storage system is charged for the target charging time at each of the at least one charging frequency values ​​through the power grid simulation device, neither the electrochemical energy storage system nor the power grid simulation device is decoupled, the status of the electrochemical energy storage system is marked as normal.

[0012] Optionally, the test specification data further includes at least one discharge frequency value and a target discharge duration;

[0013] After determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes:

[0014] For each of the at least one discharge frequency value, discharging the target discharge duration to the grid simulation device at a frequency of the discharge frequency value through the electrochemical energy storage system;

[0015] Determining whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the grid simulation device at the discharge frequency value for the target discharge duration;

[0016] If the electrochemical energy storage system is disconnected from the grid simulation device after discharging the target discharge duration to the grid simulation device at the discharge frequency value, the state of the electrochemical energy storage system is marked as abnormal.

[0017] Optionally, after determining whether the electrochemical energy storage system and the grid simulation device are disconnected after discharging the target discharge duration to the grid simulation device at the discharge frequency value through the electrochemical energy storage system, the method further includes:

[0018] If, after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of each discharge frequency value in the at least one charging frequency value, the electrochemical energy storage system and the grid simulation device are not decoupled, the status of the electrochemical energy storage system is marked as normal.

[0019] Optionally, the test specification data further includes at least one active power value group and a target power supply duration, wherein each active power value group in the at least one active power value group includes a negative power value;

[0020] After determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes:

[0021] For each active power value group in the at least one active power value group, supplying power to the electrochemical energy storage system for the target power supply duration using the power of the negative power values ​​in the active power value group through the power grid simulation device;

[0022] Determining whether a first active power deviation value exceeds a preset first standard deviation value after the electrochemical energy storage system is supplied with power by the power grid simulation device using a negative power value in the active power value group for the target power increase duration, wherein the first active power deviation value is the difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a negative power value in the active power value group;

[0023] If the first active power deviation value exceeds the first standard deviation value, marking the state of the electrochemical energy storage system as abnormal;

[0024] If the first active power deviation value does not exceed the first standard deviation value, the state of the electrochemical energy storage system is marked as normal.

[0025] Optionally, each active power value group in the at least one active power value group further includes a positive power value, and the positive power value and the negative power value are reciprocal numbers of each other:

[0026] After supplying power to the electrochemical energy storage system for the target power supply duration using the power grid simulation device at a negative power value in each of the at least one active power value group, the method further includes:

[0027] For each active power value group in the at least one active power value group, supplying power to the electrochemical energy storage system for the target power supply duration using the power of the positive power values ​​in the active power value group through the power grid simulation device;

[0028] Determining whether a second active power deviation value exceeds a preset second standard deviation value after the electrochemical energy storage system is supplied with power by the power grid simulation device at a positive power value in the active power value group for the target power increase duration, wherein the second active power deviation value is a difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a positive power value in the active power value group;

[0029] If the second active power deviation value exceeds the second standard deviation value, marking the state of the electrochemical energy storage system as abnormal;

[0030] If the second active power deviation value does not exceed the second standard deviation value, the state of the electrochemical energy storage system is marked as normal.

[0031] Optionally, the test specification data further includes a charge switching frequency value, a charge switching duration, a discharge switching frequency value, and a discharge switching duration. After determining the test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes:

[0032] Determining whether the electrochemical energy storage system switches from a charging state to a discharging state after charging the electrochemical energy storage system at a frequency of the charging switching frequency value for the charging switching duration through a power grid simulation device, and determining whether the electrochemical energy storage system switches from a discharging state to a charging state after discharging the electrochemical energy storage system at a frequency of the discharging switching frequency value for the discharging switching duration through the power grid simulation device;

[0033] If, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching duration by the power grid simulation device at the charge switching frequency value, the electrochemical energy storage system switches from the charge state to the discharge state, and after the electrochemical energy storage system is discharged with the power grid simulation device at the discharge switching frequency value for the discharge switching duration, the electrochemical energy storage system switches from the discharge state to the charge state, then the state of the electrochemical energy storage system is marked as normal;

[0034] If, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching time by the power grid simulation device at the frequency of the charge switching frequency value, the electrochemical energy storage system is not switched from the charge state to the discharge state, or after the electrochemical energy storage system is discharged with the power grid simulation device at the frequency of the discharge switching frequency value for the discharge switching time, the electrochemical energy storage system is not switched from the discharge state to the charge state, the state of the electrochemical energy storage system is marked as abnormal.

[0035] In a second aspect, an embodiment of the present application provides an energy storage system detection device, the device comprising:

[0036] a specification data determination module, configured to determine, from a preset test specification database based on performance information of the electrochemical energy storage system, test specification data for use in testing the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration;

[0037] a charging module, configured to charge the electrochemical energy storage system for the target charging time at a frequency of the charging frequency value for each of the at least one charging frequency value through a power grid simulation device;

[0038] a first determination module, configured to determine whether a disconnection occurs between the electrochemical energy storage system and the grid simulation device after the grid simulation device charges the electrochemical energy storage system for the target charging time at the charging frequency value;

[0039] The first marking module is configured to mark the state of the electrochemical energy storage system as abnormal if, after the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device, the electrochemical energy storage system is disconnected from the power grid simulation device.

[0040] Optionally, the device further comprises:

[0041] A second marking module is configured to, after determining whether the electrochemical energy storage system and the grid simulation device are disconnected after charging the electrochemical energy storage system for the target charging time at the frequency of the charging frequency value through the grid simulation device, mark the status of the electrochemical energy storage system as normal if, after charging the electrochemical energy storage system for the target charging time at the frequency of each of the at least one charging frequency value through the grid simulation device, the electrochemical energy storage system and the grid simulation device are not disconnected.

[0042] Optionally, the test specification data further includes at least one discharge frequency value and a target discharge duration;

[0043] The device further comprises:

[0044] a discharge module configured to, after determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, discharge the electrochemical energy storage system to the power grid simulation device for the target discharge duration at a frequency of the discharge frequency value for each of the at least one discharge frequency value;

[0045] a second judgment module, configured to judge whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the grid simulation device at the discharge frequency value for the target discharge duration;

[0046] The third marking module is used to mark the state of the electrochemical energy storage system as abnormal if the electrochemical energy storage system is disconnected from the grid simulation device after discharging the electrochemical energy storage system to the grid simulation device at the frequency of the discharge frequency value for the target discharge duration.

[0047] Optionally, the device further comprises:

[0048] a fourth marking module, configured to determine whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of the discharge frequency value; and mark the status of the electrochemical energy storage system as normal if the electrochemical energy storage system and the grid simulation device are not disconnected after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of each discharge frequency value in the at least one charging frequency value.

[0049] Optionally, the test specification data further includes at least one active power value group and a target power supply duration, wherein each active power value group in the at least one active power value group includes a negative power value;

[0050] The device further comprises:

[0051] a first power supply module configured to, after determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, supply power to the electrochemical energy storage system for the target power supply duration using a negative power value in each of the at least one active power value group via the power grid simulation device;

[0052] a third judgment module, configured to judge whether a first active power deviation value exceeds a preset first standard deviation value after the power grid simulation device supplies power to the electrochemical energy storage system for the target power increase duration at a negative power value in the active power value group, wherein the first active power deviation value is a difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a negative power value in the active power value group;

[0053] a fifth marking module, configured to mark the state of the electrochemical energy storage system as abnormal if the first active power deviation value exceeds the first standard deviation value;

[0054] A sixth marking module is configured to mark the state of the electrochemical energy storage system as normal if the first active power deviation value does not exceed the first standard deviation value.

[0055] Optionally, each active power value group in the at least one active power value group further includes a positive power value, and the positive power value and the negative power value are reciprocal numbers of each other;

[0056] The device further comprises:

[0057] a second power supply module, configured to, after supplying power to the electrochemical energy storage system for the target power supply duration using the negative power values ​​in the active power value group for each of the at least one active power value group, through the power grid simulation device, and then supplying power to the electrochemical energy storage system for the target power supply duration using the positive power values ​​in the active power value group for each of the at least one active power value group;

[0058] a fourth judgment module, configured to determine whether a second active power deviation value exceeds a preset second standard deviation value after the power grid simulation device supplies power to the electrochemical energy storage system for the target power increase duration using a positive power value in the active power value group, wherein the second active power deviation value is a difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a positive power value in the active power value group;

[0059] a seventh marking module, configured to mark the state of the electrochemical energy storage system as abnormal if the second active power deviation value exceeds the second standard deviation value;

[0060] an eighth marking module, configured to mark the state of the electrochemical energy storage system as normal if the second active power deviation value does not exceed the second standard deviation value.

[0061] Optionally, the test specification data further includes a charging switching frequency value, a charging switching duration, a discharging switching frequency value, and a discharging switching duration, and the device further includes:

[0062] a fifth judgment module, configured to, after determining test specification data for use in detecting the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, determine whether the electrochemical energy storage system switches from a charging state to a discharging state after charging the electrochemical energy storage system at a frequency of the charging switching frequency value for the charging switching duration through a power grid simulation device, and determine whether the electrochemical energy storage system switches from a discharging state to a charging state after discharging the electrochemical energy storage system at a frequency of the discharging switching frequency value for the discharging switching duration through the power grid simulation device;

[0063] a ninth marking module, configured to mark the state of the electrochemical energy storage system as normal if, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching duration by the power grid simulation device, the electrochemical energy storage system switches from a charge state to a discharge state, and after the electrochemical energy storage system is discharged with the discharge switching frequency value for the discharge switching duration by the power grid simulation device, the electrochemical energy storage system switches from a discharge state to a charge state;

[0064] a tenth marking module, configured to mark the state of the electrochemical energy storage system as abnormal if, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching duration by the power grid simulation device, the electrochemical energy storage system is not switched from the charge state to the discharge state, or if, after the electrochemical energy storage system is discharged with the discharge switching frequency value for the discharge switching duration by the power grid simulation device, the electrochemical energy storage system is not switched from the discharge state to the charge state.

[0065] In a third aspect, an embodiment of the present application provides a computer device comprising: a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the computer device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of an energy storage system detection method described in any optional implementation manner of the first aspect are performed.

[0066] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of an energy storage system detection method described in any optional implementation manner of the first aspect are executed.

[0067] The technical solutions provided by this application include but are not limited to the following beneficial effects:

[0068] Based on the performance information of the electrochemical energy storage system, test specification data for use in testing the electrochemical energy storage system is determined from a preset test specification database, wherein the test specification data includes at least one charging frequency value and a target charging duration. Through the above steps, the test specification data for reference can be determined based on the performance information of the electrochemical energy storage system to be tested.

[0069] For each of the at least one charging frequency value, the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device; it is determined whether the electrochemical energy storage system is disconnected from the power grid simulation device after the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device; if the electrochemical energy storage system is disconnected from the power grid simulation device after the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value, the state of the electrochemical energy storage system is marked as abnormal; through the above steps, it is possible to determine whether the electrochemical energy storage system is abnormal based on whether the electrochemical energy storage system trips when operating with the operating data indicated by the test specification data.

[0070] By adopting the above method, a power grid simulation device is used to charge the electrochemical energy storage system, and it is determined whether the energy storage switch of the electrochemical energy storage system trips after charging, so as to detect the status of the electrochemical energy storage system.

[0071] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0073] Figure 1 A flow chart of an energy storage system detection method provided by the first embodiment of the present invention is shown;

[0074] Figure 2 A flow chart of another energy storage system detection method provided by the first embodiment of the present invention is shown;

[0075] Figure 3 A flow chart of another energy storage system detection method provided in the first embodiment of the present invention is shown;

[0076] Figure 4 A flow chart of another energy storage system detection method provided in the first embodiment of the present invention is shown;

[0077] Figure 5 A flow chart of another energy storage system detection method provided by the first embodiment of the present invention is shown;

[0078] Figure 6 A schematic structural diagram of a detection circuit provided in the first embodiment of the present invention is shown;

[0079] Figure 7 A schematic structural diagram of an energy storage system detection device provided in the second embodiment of the present invention is shown;

[0080] Figure 8 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0081] Figure 9 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0082] Figure 10 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0083] Figure 11 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0084] Figure 12 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0085] Figure 13 A schematic structural diagram of another energy storage system detection device provided in the second embodiment of the present invention is shown;

[0086] Figure 14 A schematic structural diagram of a computer device provided in the third embodiment of the present invention is shown. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0088] Example 1

[0089] To facilitate understanding of this application, Figure 1 The flowchart of the energy storage system detection method provided in the first embodiment of the present invention is shown to describe the content of the first embodiment of the present application in detail.

[0090] See also Figure 1 As shown, Figure 1 A flow chart of an energy storage system detection method provided in the first embodiment of the present invention is shown, wherein the method includes steps S101 to S104:

[0091] S101: Determine test specification data for use in detecting the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration.

[0092] Specifically, since the performance of different electrochemical energy storage systems may be different, different test data are required for electrochemical energy storage systems with different performance information. Therefore, before starting the test, it is necessary to determine the test specification data required for testing the current electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system.

[0093] The test specification data includes at least one charging frequency value and a target charging duration. The number and arrangement order of the at least one charging frequency value can be set according to actual needs.

[0094] S102: For each of the at least one charging frequency value, charge the electrochemical energy storage system for the target charging duration at the frequency of the charging frequency value using a power grid simulation device.

[0095] Specifically, a frequency adaptability test of the electrochemical energy storage system is first performed, a power grid simulation device is connected to the electrochemical energy storage system, the energy storage system is set to operate in a charging state, the frequency of the power grid simulation device is adjusted to meet each charging frequency value of the at least one charging frequency value, and then for each charging frequency value of the at least one charging frequency value, the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device.

[0096] For example, adjust the frequency of the simulated power grid device to four points: 49.52Hz, 49.62Hz, 50.08Hz, and 50.18Hz (two points each above and below the power frequency), and run continuously for 2 minutes at each point.

[0097] S103: Determine whether the electrochemical energy storage system is disconnected from the grid simulation device after the grid simulation device charges the electrochemical energy storage system for the target charging time at the charging frequency value.

[0098] Specifically, for example, it is determined whether the electrochemical energy storage system is disconnected from the grid simulation device after the electrochemical energy storage system is charged for two minutes at four points: 49.52 Hz, 49.62 Hz, 50.08 Hz, and 50.18 Hz.

[0099] S104: If the electrochemical energy storage system is disconnected from the grid simulation device after the grid simulation device charges the electrochemical energy storage system at the charging frequency value for the target charging time, the state of the electrochemical energy storage system is marked as abnormal.

[0100] Specifically, for example, if the electrochemical energy storage system is disconnected from the grid simulation device after being charged for two minutes at any one of the four points of 49.52 Hz, 49.62 Hz, 50.08 Hz, and 50.18 Hz, the state of the electrochemical energy storage system is marked as abnormal.

[0101] In one feasible embodiment, after determining whether the electrochemical energy storage system is disconnected from the grid simulation device after charging the electrochemical energy storage system for the target charging time at the charging frequency value through the grid simulation device, the method further includes:

[0102] If, after the electrochemical energy storage system is charged for the target charging time at each of the at least one charging frequency values ​​through the power grid simulation device, neither the electrochemical energy storage system nor the power grid simulation device is decoupled, the status of the electrochemical energy storage system is marked as normal.

[0103] Specifically, for example, if the electrochemical energy storage system is charged at all four points of 49.52 Hz, 49.62 Hz, 50.08 Hz, and 50.18 Hz in the power grid simulation device for two minutes, and the electrochemical energy storage system and the power grid simulation device are not decoupled, the status of the electrochemical energy storage system is marked as normal.

[0104] In a feasible embodiment, the test specification data further includes at least one discharge frequency value and a target discharge duration.

[0105] Specifically, the at least one discharge frequency value includes 48.02 Hz, 48.52 Hz, 49.02 Hz, and 49.48 Hz, and the target discharge duration is 2 minutes.

[0106] See also Figure 2 As shown, Figure 2 A flowchart of another energy storage system detection method provided in the first embodiment of the present invention is shown. After determining test specification data for use in detecting the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, the method further includes steps S201 to S203:

[0107] S201: For each of the at least one discharge frequency value, discharge the target discharge duration to the power grid simulation device at the frequency of the discharge frequency value through the electrochemical energy storage system.

[0108] S202: Determine whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the grid simulation device at the discharge frequency value for the target discharge duration.

[0109] S203: If the electrochemical energy storage system is disconnected from the grid simulation device after discharging the target discharge duration to the grid simulation device at the discharge frequency value through the electrochemical energy storage system, the state of the electrochemical energy storage system is marked as abnormal.

[0110] Specifically, referring to the charging process in steps S101 to S104, for each of the at least one discharge frequency value, the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of the discharge frequency value.

[0111] For example, an electrochemical energy storage device is used to discharge the power grid simulation device, and the discharge frequency is adjusted to four points: 49.52Hz, 49.62Hz, 50.08Hz, and 50.18Hz (two points each above and below the power frequency). The device is run continuously for 2 minutes at each point to determine whether the electrochemical energy storage device is decoupled. If decoupling occurs at any point, it indicates that the electrochemical energy storage device has an abnormality.

[0112] In one feasible embodiment, after determining whether the electrochemical energy storage system and the grid simulation device are disconnected after discharging the target discharge duration to the grid simulation device at the discharge frequency value through the electrochemical energy storage system, the method further includes:

[0113] If, after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of each discharge frequency value in the at least one charging frequency value, the electrochemical energy storage system and the grid simulation device are not decoupled, the status of the electrochemical energy storage system is marked as normal.

[0114] Specifically, if decoupling does not occur at all frequencies, it means that there is no abnormality in the electrochemical energy storage device.

[0115] In a feasible embodiment, the test specification data further includes at least one active power value group and a target power supply duration, wherein each active power value group in the at least one active power value group includes a negative power value.

[0116] Specifically, for example, the at least one active power value group includes a first active power value group (-0.25PN), a second active power value group (-0.5PN), a third active power value group (-0.75PN), a fourth active power value group (-PN), and a fifth active power value group (0PN), and the target power supply time is 30s.

[0117] See also Figure 3 As shown, Figure 3 A flowchart of another energy storage system detection method provided in the first embodiment of the present invention is shown. After determining test specification data for use in detecting the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, the method further includes steps S301 to S304:

[0118] S301: For each active power value group in the at least one active power value group, supply power to the electrochemical energy storage system for the target power supply duration using the power of the negative power values ​​in the active power value group through the power grid simulation device.

[0119] Specifically, for example, the electrochemical energy storage system is powered for 30 seconds with the negative power value (-0.25PN) in the first active power value group (-0.25PN, 0.25PN). Similarly, the electrochemical energy storage system is powered for 30 seconds with the second active power value group, the third active power value group, the fourth active power value group, and the fifth active power value group.

[0120] S302: Determine whether a first active power deviation value exceeds a preset first standard deviation value after the electrochemical energy storage system is supplied with power for the target power increase duration by the power grid simulation device with a negative power value in the active power value group, wherein the first active power deviation value is the difference between the power value of the sequential power output by the electrochemical energy storage system under the power supply of the power grid simulation device and the negative power value in the active power value group.

[0121] Specifically, for example, after the electrochemical energy storage system is powered for 30 seconds with the negative power value (-0.25PN) in the first active power value group (-0.25PN, 0.25PN), it is determined whether the difference between the sequential power output by the electrochemical energy storage system and the negative power value (-0.25PN) exceeds the preset first standard deviation value. Then, it is determined in sequence whether the difference between the sequential power output by the electrochemical energy storage system and the negative power value of each active power value group exceeds the preset first standard deviation value after the electrochemical energy storage system is powered for 30 seconds with the second active power value group, the third active power value group, the fourth active power value group, and the fifth active power value group.

[0122] S303: If the first active power deviation value exceeds the first standard deviation value, mark the state of the electrochemical energy storage system as abnormal.

[0123] Specifically, if the first active power deviation value exceeds a preset first standard deviation value after the electrochemical energy storage system is supplied with power of the negative power value in the active power value group by the grid simulation device for the target power increase duration, it indicates that there is an abnormality in the electrochemical energy storage system.

[0124] S304: If the first active power deviation value does not exceed the first standard deviation value, mark the state of the electrochemical energy storage system as normal.

[0125] Specifically, if the first active power deviation value does not exceed the first standard deviation value, it indicates that there is no abnormality in the electrochemical energy storage system.

[0126] In a feasible implementation manner, each active power value group in the at least one active power value group further includes a positive power value, and the positive power value and the negative power value are inverse numbers of each other.

[0127] See also Figure 4 As shown, Figure 4 A flowchart of another energy storage system detection method provided in the first embodiment of the present invention is shown. After, for each active power value group in the at least one active power value group, the grid simulation device supplies power to the electrochemical energy storage system for the target power supply duration using the negative power values ​​in the active power value group, the method further includes steps S401 to S404:

[0128] S401: For each active power value group in the at least one active power value group, supply power to the electrochemical energy storage system for the target power supply duration using the power of the positive power values ​​in the active power value group through the power grid simulation device.

[0129] S402: Determine whether a second active power deviation value exceeds a preset second standard deviation value after the power grid simulation device supplies power to the electrochemical energy storage system for the target power increase duration with a positive power value in the active power value group, wherein the second active power deviation value is the difference between the power value of the sequential power output by the electrochemical energy storage system under the power supply of the power grid simulation device and the positive power value in the active power value group.

[0130] S403: If the second active power deviation value exceeds the second standard deviation value, mark the state of the electrochemical energy storage system as abnormal.

[0131] S404: If the second active power deviation value does not exceed the second standard deviation value, mark the state of the electrochemical energy storage system as normal.

[0132] For details, please refer to the implementation methods provided in steps S301 to S304.

[0133] In a feasible implementation manner, the test specification data further includes a charge switching frequency value, a charge switching duration, a discharge switching frequency value, and a discharge switching duration.

[0134] See also Figure 5 As shown, Figure 5 A flowchart of another energy storage system detection method provided in Example 1 of the present invention is shown. After determining test specification data for use in detecting the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, the method further includes steps S501 to S504:

[0135] S501: Determine whether the electrochemical energy storage system is switched from a charging state to a discharging state after charging the electrochemical energy storage system with the charging switching frequency value for the charging switching duration through a power grid simulation device, and determine whether the electrochemical energy storage system is switched from a discharging state to a charging state after discharging the electrochemical energy storage system with the discharging switching frequency value for the discharging switching duration through a power grid simulation device.

[0136] Specifically, after the power grid simulation device charges the electrochemical energy storage system in normal state at a frequency of the specified charging switching frequency value for a specified time, the electrochemical energy storage system will switch from a charging state to a discharging state; at the same time, after the electrochemical energy storage system in normal state discharges to the power grid simulation device at a frequency of the specified discharging switching frequency value for a specified time, the electrochemical energy storage system will switch from a discharging state to a charging state; therefore, it is judged whether the electrochemical energy storage system can simultaneously meet the above two conditions, thereby judging the state of the electrochemical energy storage system.

[0137] S502: If the electrochemical energy storage system is switched from a charging state to a discharging state after being charged to the electrochemical energy storage system at the frequency of the charging switching frequency value for the charging switching time through the power grid simulation device, and if the electrochemical energy storage system is switched from a discharging state to a charging state after being discharged to the power grid simulation device at the frequency of the discharging switching frequency value for the discharging switching time through the electrochemical energy storage system, the state of the electrochemical energy storage system is marked as normal.

[0138] Specifically, if the electrochemical energy storage system can satisfy the above two conditions at the same time, it means that the state of the electrochemical energy storage system is normal.

[0139] S503: If the electrochemical energy storage system is not switched from a charging state to a discharging state after being charged to the electrochemical energy storage system at the charging switching frequency value for the charging switching time through the power grid simulation device, or if the electrochemical energy storage system is not switched from a discharging state to a charging state after being discharged to the power grid simulation device at the discharging switching frequency value for the discharging switching time through the electrochemical energy storage system, the state of the electrochemical energy storage system is marked as abnormal.

[0140] Specifically, if the electrochemical energy storage system fails to meet the above two conditions at the same time, it indicates that the state of the electrochemical energy storage system is abnormal.

[0141] When testing an electrochemical energy storage system, in addition to the above methods, the system status of the electrochemical energy storage system may also be tested according to the following methods.

[0142] Method 1: To test the voltage adaptability of the energy storage system, a simulated grid device should be used to simulate grid voltage changes. First, connect the energy storage system to the simulated grid device and set the energy storage system to operate in a charging state. Adjust the simulated grid device's output voltage to 86%, 90%, 100%, 105%, and 109% of the nominal voltage of the intended grid. Run each point continuously for 2 minutes. No tripping should occur, otherwise the test should be terminated.

[0143] Adjust the simulated grid device output voltage to 50%, 65%, 84%, 110%, 114%, and 119% of the nominal voltage of the intended grid, and record the energy storage system trip time. Adjust the simulated grid device output voltage to 20%, 30%, 49%, 120%, 122%, and 125% of the nominal voltage of the intended grid, and record the energy storage system trip time. Repeat the above steps for the energy storage system operating in the discharge state.

[0144] Method 2: Connect the energy storage system to a simulated power grid device (public grid), adjust all parameters to normal operating conditions, and conduct a power ramp test of the active power regulation capability. First, set the active power of the energy storage system to 0, and gradually adjust the active power setting value to -0.25PN (PN is the nominal pressure), 0.25PN, -0.5PN, 0.5PN, -0.75PN, 0.75PN, -PN, PN, and 0. Each power point is maintained for at least 30 seconds. Measure the time-series power at the energy storage system's grid connection point, taking the average active power value every 0.2 seconds as a point and recording the measured curve. After the test, calculate the 15-second average active power value for the second 15 seconds after each active power change. Calculate the control accuracy, response time, and adjustment time of the active power at each of the above points.

[0145] Connect the energy storage system to a simulated power grid device (public grid), adjust all parameters to normal operating conditions, and conduct a power reduction test of the active power regulation capability. First, set the active power of the energy storage system to PN. Adjust the active power setting value step by step to -PN, 0.75PN, -0.75PN, 0.5PN, -0.5PN, 0.25PN, -0.25PN, and 0. Each power point is maintained for at least 30 seconds. Measure the time-series power at the energy storage system's grid connection point, and record the measured curve with the average active power value every 0.2 seconds as a point. After the test, calculate the 15-second average active power value for the second 15 seconds after each active power change. Calculate the control accuracy, response time, and adjustment time of the active power at each of the above points.

[0146] Method 3: Connect the energy storage system to a simulated power grid (public grid), adjust all parameters to normal operating conditions, and conduct a reactive power regulation charging mode test. First, set the energy storage system active power to PN and adjust the system to operate in the maximum inductive reactive power output mode. The active power setpoint is gradually adjusted to 0.9PN, 0.8PN, 0.7PN, 0.6PN, 0.5PN, 0.4PN, 0.3PN, 0.2PN, 0.1PN, and 0. Measure the time-series power at the energy storage system's grid connection point, recording the active and reactive power for at least 30 seconds. Calculate the average active and reactive power values ​​for the next 15 seconds, taking the average power value every 0.2 seconds as a point. Then adjust the energy storage system to operate in the maximum capacitive reactive power output mode and repeat the above steps. Finally, plot the energy storage system's power envelope with active power as the horizontal axis and reactive power as the vertical axis.

[0147] Connect the energy storage system to a simulated power grid (public grid), adjust all parameters to normal operating conditions, and conduct a discharge mode test of its reactive power regulation capability. First, set the energy storage system's active power to PN and adjust the system to operate in the maximum inductive reactive power output mode. The active power setpoint is gradually adjusted to 0.9PN, 0.8PN, 0.7PN, 0.6PN, 0.5PN, 0.4PN, 0.3PN, 0.2PN, 0.1PN, and 0. Measure the time-series power at the energy storage system's grid connection point, recording the active and reactive power for at least 30 seconds. Calculate the average active and reactive power values ​​for the next 15 seconds, taking the average power value every 0.2 seconds as a point. Then adjust the energy storage system to operate in the maximum capacitive reactive power output mode and repeat the above steps. Finally, plot the energy storage system's power envelope, with active power as the horizontal axis and reactive power as the vertical axis.

[0148] Method 4: Connect the energy storage system to a simulated power grid (public grid), adjust all parameters to normal operating conditions, and conduct a power factor regulation capability test. First, adjust the energy storage system's discharge active power to 0.25PN, 0.5PN, 0.75PN, and PN. Adjust the energy storage system's power factor from a leading 0.95 to a lagging 0.95, with an adjustment range of no more than 0.01. Measure and record the energy storage system's actual output power factor. Then, adjust the energy storage system's charging active power to 0.25PN, 0.5PN, 0.75PN, and PN. Adjust the energy storage system's power factor from a leading 0.95 to a lagging 0.95, with an adjustment range of no more than 0.01. Measure and record the energy storage system's actual output power factor.

[0149] Method 5: Adjust the energy storage system to hot standby mode, set the energy storage system charging active power setting value to 1.1PN, run it continuously for 10 minutes, measure the time series power at the energy storage system grid connection point, and record the measured curve with the average active power value every 0.2s. Set the energy storage system charging active power setting value to 1.2PN, run it continuously for 1 minute, measure the time series power at the energy storage system grid connection point, and record the measured curve with the average active power value every 0.2s.

[0150] Adjust the energy storage system to hot standby mode, set the energy storage system discharge active power setting value to 1.1PN, run continuously for 10 minutes, measure the time sequence power at the energy storage system grid connection point, take the average value of the active power every 0.2s as one point, and record the measured curve; set the energy storage system charging active power setting value to 1.2PN, run continuously for 1 minute, measure the time sequence power at the energy storage system grid connection point, take the average value of the active power every 0.2s as one point, and record the measured curve.

[0151] Method 6: Before conducting a low voltage ride-through test on an energy storage system connected to the grid at a voltage level of 10(6)kV or above, the following preparations must be made. The energy storage system should operate in a control mode consistent with that used during actual operation. Connect the energy storage system, grid fault simulation device, data acquisition device, and other related equipment, select six drop points (0% UN, 20% UN, 35% UN, 50% UN, 75% UN, and 90% UN) (UN is the nominal voltage), and select the drop time according to the preset rules.

[0152] Before the low voltage ride-through test, a no-load test should be performed, with the energy storage system's energy storage converter disconnected. First, adjust the grid fault simulation generator to simulate a three-phase symmetrical fault on the line. The voltage drop point should be selected according to the test preparation requirements. The grid fault simulation generator should also be adjusted to simulate a two-phase short circuit or ground short circuit. The voltage drop point should also be selected according to the test preparation requirements. Record the voltage curve at the energy storage system's grid connection point.

[0153] If the no-load test results meet the requirements, a low voltage ride-through load test can be performed. The configuration of the grid fault simulation generator during the load test should remain consistent with the no-load test. First, connect the energy storage system disconnected during the no-load test to the grid for operation. Adjust the energy storage system output power to 0.2PN. Control the grid fault simulation generator to perform a three-phase symmetrical voltage drop. Record the voltage and current waveforms at the energy storage system's grid connection point. Data should be recorded from 15 seconds before the voltage drop to 10 seconds after the voltage returns to normal. Control the grid fault simulation generator to perform an asymmetrical voltage drop. Record the voltage and current waveforms at the energy storage system's grid connection point. Data should be recorded from 15 seconds before the voltage drop to 10 seconds after the voltage returns to normal. Adjust the energy storage system output power to the rated power PN and repeat the above test steps.

[0154] Method 7: Before conducting a high voltage ride-through test on an energy storage system connected to the grid at a voltage level of 10(6) kV or above, the following preparations must be made. The energy storage system should operate in a control mode consistent with that used during actual operation. Connect the energy storage system, grid fault simulation device, data acquisition device, and other related equipment, select the three points of 110% UN, 125% UN, and 130% UN, and select the lift time according to the preset rules.

[0155] Before the HVRT test, a no-load test should be performed, with the energy storage system's energy storage converter disconnected. First, adjust the grid fault simulator to simulate a three-phase voltage rise on the line. The voltage rise point should be selected according to the test preparation requirements, and the voltage curve at the energy storage system's grid connection point should be recorded. If the no-load test results meet the requirements, a HVRT load test can be performed. The grid fault simulator configuration during the load test should remain the same as for the no-load test. First, connect the energy storage system, which was disconnected during the no-load test, to the grid for operation. Adjust the energy storage system's output power to 0.2 PN. Control the grid fault simulator to perform a three-phase symmetrical voltage rise. Record the voltage and current waveforms at the energy storage system's grid connection point, including data from at least 15 seconds before the voltage rise and 10 seconds after the voltage returns to normal. Adjust the energy storage system's output power to its rated power PN and repeat the above test steps.

[0156] Method 8: Grid-related protection function test: The grid-related protection function test of the energy storage system should comply with the provisions of DL / T995 (Inspection procedures for relay protection and grid safety automatic devices).

[0157] Method 9: Unplanned island protection function test: Test the unplanned island protection characteristics of the energy storage system. Figure 6 As shown, Figure 6 A schematic diagram of the structure of a detection circuit provided in a first embodiment of the present invention is shown, wherein the circuit includes a power grid simulation device, a load, a switch S1, a switch S2, a switch S3, and an energy storage system. For a three-phase four-wire energy storage system, the diagram shows the phase-to-neutral wiring, and for a three-phase three-wire energy storage system, the diagram shows the phase-to-phase wiring.

[0158] First, set the anti-islanding protection setting of the energy storage system, adjust the energy storage system discharge power to the rated power, set the simulated grid device (public grid) voltage to the nominal voltage of the energy storage system, the frequency to the rated frequency of the energy storage system, adjust the load quality factor Q to 1.0±0.05, close switches S1, S2, and S3 until the energy storage system reaches the specified value, adjust the load until the fundamental current of each phase through switch S3 is less than 2% of the steady-state rated current of each phase of the energy storage system, disconnect S3, and record the time interval from disconnecting S3 to the energy storage system stopping supplying power to the load, that is, the disconnection time. Within the range of 95% to 105% of the initial balanced load, adjust the reactive load to increase by 1% (or adjust the reactive power of the energy storage system). The load rate is increased by 1%. If the energy storage system disconnection time increases, the reactive load (or reactive power) needs to be increased by an additional 1% until the disconnection time no longer increases. If the disconnection time still increases at 95% or 105% of the initial balanced load, the reactive load (or reactive power) needs to be reduced or increased by an additional 1% until the disconnection time no longer increases. In the test results, the three test points with the longest disconnection time should be tested twice. If the three longest disconnection times occur at discontinuous 1% load increases, all test points between the three longest disconnection times should be tested twice. Adjust the energy storage system output power to 66% and 33% of the rated power, respectively, and repeat the above test steps.

[0159] Method 10: Charging response time test: Under rated power charging and discharging conditions, adjust the energy storage system to hot standby state and test the charging response time. First, record the time when the energy storage system receives the control signal, which is recorded as t Cl , record the moment when the energy storage system charging power reaches 90% of the rated power for the first time, denoted as t C2 , subtract the two recorded moments to calculate the charging response time RT c , repeat the above steps 5 times, and take the average value of the 5 test results for the charging response time.

[0160] Method 11: Discharge response time test: Under rated power discharge conditions, adjust the energy storage system to hot standby state and test the discharge response time. First, record the time when the energy storage system receives the control signal, which is recorded as t Dl , record the moment when the energy storage system discharge power reaches 90% of the rated power for the first time, denoted as t D2 , subtract the two recorded moments to calculate the discharge response time RT D , repeat the above steps five times, and take the average value of the five test results for the discharge response time.

[0161] Method 12: Under rated power charging and discharging conditions, adjust the energy storage system to hot standby mode and test the charging adjustment time. First, record the time when the energy storage system receives the control signal, which is recorded as t C3, record the starting time when the deviation of the energy storage system charging power is maintained within ±2% of the rated power, and record it as t C4 , subtract the two recorded moments to calculate the charging response time AT C , repeat the above steps 5 times, and take the average value of the 5 test results for the charging adjustment time.

[0162] Method 13: Under rated power charging and discharging conditions, adjust the energy storage system to hot standby mode and test the discharge adjustment time. First, record the time when the energy storage system receives the control signal, which is recorded as t D3 , record the starting time when the deviation of the energy storage system discharge power is maintained within ±2% of the rated power, and record it as t D4 , subtract the two recorded moments to calculate the discharge response time AT D , repeat the above steps 5 times, and take the average value of the 5 test results for the discharge adjustment time.

[0163] Method 14: Under rated power charging and discharging conditions, adjust the energy storage system to hot standby mode and measure the charge-to-discharge transition time. First, set the energy storage system to charge at rated power, send a command to discharge at rated power, and record the time t1 from charging at 90% of rated power to discharging at 90% of rated power. Repeat these steps five times, and take the average of the five test results for the charge-to-discharge transition time.

[0164] Method 15: Under rated power charging and discharging conditions, adjust the energy storage system to hot standby mode and measure the discharge-to-charge transition time. First, set the energy storage system to discharge at rated power, send a charge command to the energy storage system at rated power, and record the time t2 from 90% rated power discharge to 90% rated power charge. Repeat these steps five times, and take the average of the five test results for the discharge-to-charge transition time.

[0165] Method 16: Under stable operation, the energy storage system is tested for charging and discharging energy at rated power. First, discharge at rated power until the discharge termination condition is reached, and then charge at rated power until the charge termination condition is reached, and then record the energy E charged by the energy storage system during this charging process. C and auxiliary energy consumption W C , discharge at rated power until the discharge termination condition is reached, and then stop discharging. The energy E discharged by the energy storage system during this discharge process is recorded. D and auxiliary energy consumption W D Repeat the above steps twice and record the charge and discharge energy E each time Cn 、E Dn and auxiliary energy consumption W Cn 、W Dn Calculate the average value according to the following formula, record E Cis the rated charging energy of the energy storage system, E D is the rated discharge energy of the energy storage system.

[0166]

[0167]

[0168] Among them, E C1 For the first charge energy, W C1 is the auxiliary energy consumption in the first charge, E C2 For the second charge energy, W C2 is the auxiliary energy consumption in the second charging, E C3 Charge energy for the third time, W C3 is the auxiliary energy consumption during the third charging; E D1 is the first discharge energy, W D1 is the auxiliary energy consumption in the first discharge, E D2 is the second discharge energy, W D2 is the auxiliary energy consumption in the second discharge, E D3 is the third discharge energy, W D3 is the auxiliary energy consumption in the third discharge.

[0169] Method 17: Under stable operation, the energy storage system is charged and discharged at rated power to test the rated power energy conversion efficiency of the energy storage system. First, discharge at the predetermined power until the discharge termination condition is reached, and then charge at the rated power until the charge termination condition is reached, and then stop charging. The energy E charged by the energy storage system during this charging process is recorded. C and auxiliary energy consumption W C , discharge at rated power until the discharge termination condition is reached, and then stop discharging. The energy E discharged by the energy storage system during this discharge process is recorded. D and auxiliary energy consumption W D Repeat the above steps twice and record the charge and discharge energy E each time Cn 、E Dn and auxiliary energy consumption W Cn 、W Dn , calculate the energy conversion efficiency η according to the following formula.

[0170]

[0171] Among them, E C1 For the first charge energy, W C1 is the auxiliary energy consumption in the first charge, E C2 For the second charge energy, W C2 is the auxiliary energy consumption in the second charging, E C3 Charge energy for the third time, W C3is the auxiliary energy consumption during the third charging; E D1 is the first discharge energy, W D1 is the auxiliary energy consumption in the first discharge, E D2 is the second discharge energy, W D2 is the auxiliary energy consumption in the second discharge, E D3 is the third discharge energy, W D3 is the auxiliary energy consumption in the third discharge.

[0172] Example 2

[0173] See also Figure 7 As shown, Figure 7 FIG. 1 shows a schematic structural diagram of an energy storage system detection device provided in Embodiment 2 of the present invention, wherein the energy storage system detection device provided in Embodiment 2 of the present invention includes:

[0174] a specification data determination module 701 for determining, from a preset test specification database, test specification data for use in testing the electrochemical energy storage system based on performance information of the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration;

[0175] A charging module 702 is configured to charge the electrochemical energy storage system for the target charging time at a frequency of the charging frequency value for each of the at least one charging frequency value using a power grid simulation device;

[0176] A first determination module 703 is configured to determine whether a disconnection occurs between the electrochemical energy storage system and the grid simulation device after the grid simulation device charges the electrochemical energy storage system for the target charging time at the charging frequency value;

[0177] The first marking module 704 is configured to mark the state of the electrochemical energy storage system as abnormal if, after the electrochemical energy storage system is charged for the target charging time at the charging frequency value through the power grid simulation device, the electrochemical energy storage system is disconnected from the power grid simulation device.

[0178] In one possible embodiment, see Figure 8 As shown, Figure 8 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0179] The second marking module 801 is configured to, after determining whether the electrochemical energy storage system and the grid simulation device are disconnected after the grid simulation device charges the electrochemical energy storage system for the target charging time at the charging frequency value, mark the status of the electrochemical energy storage system as normal if, after the grid simulation device charges the electrochemical energy storage system for the target charging time at each of the at least one charging frequency value, the electrochemical energy storage system and the grid simulation device are not disconnected.

[0180] In a feasible embodiment, the test specification data further includes at least one discharge frequency value and a target discharge duration;

[0181] See also Figure 9 As shown, Figure 9 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0182] a discharge module 901 configured to, after determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, discharge the electrochemical energy storage system to the power grid simulation device at a frequency of the discharge frequency value for a target discharge duration for each of the at least one discharge frequency value;

[0183] A second determination module 902 is configured to determine whether a disconnection occurs between the electrochemical energy storage system and the grid simulation device after the electrochemical energy storage system discharges the grid simulation device at the discharge frequency value for the target discharge duration;

[0184] The third marking module 903 is used to mark the state of the electrochemical energy storage system as abnormal if the electrochemical energy storage system is disconnected from the grid simulation device after discharging the electrochemical energy storage system to the grid simulation device at the frequency of the discharge frequency value for the target discharge duration.

[0185] In one possible embodiment, see Figure 10 As shown, Figure 10 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0186] The fourth marking module 1001 is used to determine whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of the discharge frequency value; if the electrochemical energy storage system and the grid simulation device are not disconnected after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of each discharge frequency value in the at least one charging frequency value, then the status of the electrochemical energy storage system is marked as normal.

[0187] In a feasible embodiment, the test specification data further includes at least one active power value group and a target power supply duration, wherein each active power value group in the at least one active power value group includes a negative power value;

[0188] See also Figure 11 As shown, Figure 11 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0189] A first power supply module 1101 is configured to, after determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, supply power to the electrochemical energy storage system for the target power supply duration using the negative power values ​​in each of the at least one active power value group via the power grid simulation device;

[0190] A third judgment module 1102 is configured to determine whether a first active power deviation value exceeds a preset first standard deviation value after the power grid simulation device supplies power to the electrochemical energy storage system for the target power increase duration using a negative power value in the active power value group, wherein the first active power deviation value is the difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a negative power value in the active power value group;

[0191] a fifth marking module 1103, configured to mark the state of the electrochemical energy storage system as abnormal if the first active power deviation value exceeds the first standard deviation value;

[0192] The sixth marking module 1104 is configured to mark the state of the electrochemical energy storage system as normal if the first active power deviation value does not exceed the first standard deviation value.

[0193] In a feasible implementation manner, each active power value group in the at least one active power value group further includes a positive power value, and the positive power value and the negative power value are inverse numbers of each other.

[0194] See also Figure 12 As shown, Figure 12 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0195] A second power supply module 1201 is configured to, after supplying power to the electrochemical energy storage system for the target power supply duration using the negative power values ​​in the active power value group for each of the at least one active power value group, and then supplying power to the electrochemical energy storage system for the target power supply duration using the positive power values ​​in the active power value group for each of the at least one active power value group.

[0196] A fourth determination module 1202 is configured to determine whether, after the power grid simulation device supplies power to the electrochemical energy storage system for the target power-up duration using a positive power value in the active power value group, a second active power deviation value exceeds a preset second standard deviation value, wherein the second active power deviation value is the difference between a power value of a sequential power output by the electrochemical energy storage system when powered by the power grid simulation device and a positive power value in the active power value group;

[0197] a seventh marking module 1203, configured to mark the state of the electrochemical energy storage system as abnormal if the second active power deviation value exceeds the second standard deviation value;

[0198] The eighth marking module 1204 is configured to mark the state of the electrochemical energy storage system as normal if the second active power deviation value does not exceed the second standard deviation value.

[0199] In a feasible implementation manner, the test specification data further includes a charge switching frequency value, a charge switching duration, a discharge switching frequency value, and a discharge switching duration.

[0200] See also Figure 13 As shown, Figure 13 FIG. 1 shows a schematic structural diagram of another energy storage system detection device provided in Embodiment 2 of the present invention, wherein the device further includes:

[0201] a fifth judgment module 1301, configured to, after determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, determine whether the electrochemical energy storage system switches from a charging state to a discharging state after charging the electrochemical energy storage system at a frequency of the charging switching frequency value for the charging switching duration via a power grid simulation device, and determine whether the electrochemical energy storage system switches from a discharging state to a charging state after discharging the electrochemical energy storage system at a frequency of the discharging switching frequency value for the discharging switching duration via the power grid simulation device;

[0202] a ninth marking module 1302, configured to mark the state of the electrochemical energy storage system as normal if, after the electrochemical energy storage system is charged for the charge switching duration at the charge switching frequency value by the power grid simulation device, the electrochemical energy storage system switches from a charge state to a discharge state, and if, after the electrochemical energy storage system is discharged for the discharge switching duration at the discharge switching frequency value by the power grid simulation device, the electrochemical energy storage system switches from a discharge state to a charge state;

[0203] The tenth marking module 1303 is configured to mark the state of the electrochemical energy storage system as abnormal if, after the electrochemical energy storage system is charged at the charging switching frequency value for the charging switching duration through the power grid simulation device, the electrochemical energy storage system does not switch from the charging state to the discharging state, or if, after the electrochemical energy storage system is discharged at the discharge switching frequency value for the power grid simulation device for the discharging switching duration, the electrochemical energy storage system does not switch from the discharging state to the charging state.

[0204] Example 3

[0205] Based on the same application concept, see Figure 14 As shown, Figure 14 FIG. 1 shows a schematic diagram of the structure of a computer device provided by the third embodiment of the present invention, wherein Figure 14 As shown, a computer device 1400 provided in the third embodiment of the present application includes:

[0206] A processor 1401, a memory 1402, and a bus 1403. The memory 1402 stores machine-readable instructions executable by the processor 1401. When the computer device 1400 is running, the processor 1401 communicates with the memory 1402 via the bus 1403. When the processor 1401 is running, the machine-readable instructions execute the steps of the energy storage system detection method shown in the above-mentioned embodiment 1.

[0207] Example 4

[0208] Based on the same application concept, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of an energy storage system detection method described in any one of the above embodiments are executed.

[0209] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0210] The computer program product for performing energy storage system detection provided in an embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the previous method embodiments. For specific implementation, please refer to the method embodiments and will not be repeated here.

[0211] The energy storage system detection device provided in the embodiments of the present invention can be specific hardware on the device or software or firmware installed on the device. The implementation principles and technical effects of the device provided in the embodiments of the present invention are the same as those of the aforementioned method embodiments. For the sake of simplicity, any details not mentioned in the device embodiments can be referred to the corresponding contents in the aforementioned method embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity of description, the specific operating processes of the systems, devices, and units described above can all refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0212] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, the indirect coupling or communication connection of the device or unit may be electrical, mechanical or other forms.

[0213] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

Claims

1. A method for detecting an energy storage system, characterized in that: The method comprises: Determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on performance information of the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration; For each of the at least one charging frequency value, charging the electrochemical energy storage system for the target charging duration at the frequency of the charging frequency value using a power grid simulation device; Determining whether the electrochemical energy storage system is disconnected from the grid simulation device after charging the electrochemical energy storage system for the target charging time at the charging frequency value through the grid simulation device; If the electrochemical energy storage system is disconnected from the grid simulation device after the grid simulation device charges the electrochemical energy storage system at the charging frequency value for the target charging time, the state of the electrochemical energy storage system is marked as abnormal.

2. The method according to claim 1, characterized in that After determining whether the electrochemical energy storage system is disconnected from the grid simulation device after charging the electrochemical energy storage system for the target charging time at the charging frequency value through the grid simulation device, the method further includes: If, after the electrochemical energy storage system is charged for the target charging time at each of the at least one charging frequency values ​​through the power grid simulation device, neither the electrochemical energy storage system nor the power grid simulation device is decoupled, the status of the electrochemical energy storage system is marked as normal.

3. The method according to claim 1, characterized in that The test specification data also includes at least one discharge frequency value and a target discharge duration; After determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes: For each of the at least one discharge frequency value, discharging the target discharge duration to the grid simulation device at a frequency of the discharge frequency value through the electrochemical energy storage system; Determining whether the electrochemical energy storage system and the grid simulation device are disconnected after the electrochemical energy storage system discharges the grid simulation device at the discharge frequency value for the target discharge duration; If the electrochemical energy storage system is disconnected from the grid simulation device after discharging the target discharge duration to the grid simulation device at the discharge frequency value, the state of the electrochemical energy storage system is marked as abnormal.

4. The method according to claim 3, characterized in that After determining whether disconnection occurs between the electrochemical energy storage system and the grid simulation device after the electrochemical energy storage system discharges the target discharge duration at the discharge frequency value to the grid simulation device, the method further includes: If, after the electrochemical energy storage system discharges the target discharge duration to the grid simulation device at the frequency of each discharge frequency value in the at least one charging frequency value, the electrochemical energy storage system and the grid simulation device are not decoupled, the status of the electrochemical energy storage system is marked as normal.

5. The method according to claim 1, wherein The test specification data further includes at least one active power value group and a target power supply duration, wherein each active power value group in the at least one active power value group includes a negative power value; After determining test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes: For each active power value group in the at least one active power value group, supplying power to the electrochemical energy storage system for the target power supply duration using the power of the negative power values ​​in the active power value group through the power grid simulation device; Determining whether a first active power deviation value exceeds a preset first standard deviation value after the electrochemical energy storage system is supplied with power for the target power supply duration by the power grid simulation device using a negative power value in the active power value group, wherein the first active power deviation value is a difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a negative power value in the active power value group; If the first active power deviation value exceeds the first standard deviation value, marking the state of the electrochemical energy storage system as abnormal; If the first active power deviation value does not exceed the first standard deviation value, the state of the electrochemical energy storage system is marked as normal.

6. The method according to claim 5, characterized in that Each active power value group in the at least one active power value group further includes a positive power value, and the positive power value and the negative power value are reciprocal numbers of each other: After supplying power to the electrochemical energy storage system for the target power supply duration using the power grid simulation device at a negative power value in each of the at least one active power value group, the method further includes: For each active power value group in the at least one active power value group, supplying power to the electrochemical energy storage system for the target power supply duration using the power of the positive power values ​​in the active power value group through the power grid simulation device; Determining whether a second active power deviation value exceeds a preset second standard deviation value after the electrochemical energy storage system is supplied with power for the target power supply duration by the power grid simulation device using a positive power value in the active power value group, wherein the second active power deviation value is a difference between a power value of a sequential power output by the electrochemical energy storage system under power supply by the power grid simulation device and a positive power value in the active power value group; If the second active power deviation value exceeds the second standard deviation value, marking the state of the electrochemical energy storage system as abnormal; If the second active power deviation value does not exceed the second standard deviation value, the state of the electrochemical energy storage system is marked as normal.

7. The method according to claim 1, characterized in that The test specification data also includes a charge switching frequency value, a charge switching duration, a discharge switching frequency value, and a discharge switching duration. After determining the test specification data for use in testing the electrochemical energy storage system from a preset test specification database based on the performance information of the electrochemical energy storage system, the method further includes: Determining whether the electrochemical energy storage system switches from a charging state to a discharging state after charging the electrochemical energy storage system at a frequency of the charging switching frequency value for the charging switching duration through a power grid simulation device, and determining whether the electrochemical energy storage system switches from a discharging state to a charging state after discharging the electrochemical energy storage system at a frequency of the discharging switching frequency value for the discharging switching duration through the power grid simulation device; If, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching duration by the power grid simulation device at the charge switching frequency value, the electrochemical energy storage system switches from the charge state to the discharge state, and after the electrochemical energy storage system is discharged with the power grid simulation device at the discharge switching frequency value for the discharge switching duration, the electrochemical energy storage system switches from the discharge state to the charge state, then the state of the electrochemical energy storage system is marked as normal; If, after the electrochemical energy storage system is charged with the charge switching frequency value for the charge switching time by the power grid simulation device at the frequency of the charge switching frequency value, the electrochemical energy storage system is not switched from the charge state to the discharge state, or after the electrochemical energy storage system is discharged with the power grid simulation device at the frequency of the discharge switching frequency value for the discharge switching time, the electrochemical energy storage system is not switched from the discharge state to the charge state, the state of the electrochemical energy storage system is marked as abnormal.

8. An energy storage system detection device, characterized in that: The device comprises: a specification data determination module, configured to determine, from a preset test specification database based on performance information of the electrochemical energy storage system, test specification data for use in testing the electrochemical energy storage system, wherein the test specification data includes at least one charging frequency value and a target charging duration; a charging module, configured to charge the electrochemical energy storage system for the target charging time at a frequency of the charging frequency value for each of the at least one charging frequency value through a power grid simulation device; a first determination module, configured to determine whether a disconnection occurs between the electrochemical energy storage system and the grid simulation device after the grid simulation device charges the electrochemical energy storage system for the target charging time at the charging frequency value; The first marking module is configured to mark the state of the electrochemical energy storage system as abnormal if, after the electrochemical energy storage system is charged for the target charging time at the frequency of the charging frequency value through the power grid simulation device, the electrochemical energy storage system is disconnected from the power grid simulation device.

9. A computer device, characterized in that: include: A processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the computer device is running, the processor and the memory communicate via the bus. When the machine-readable instructions are executed by the processor, the steps of the energy storage system detection method according to any one of claims 1 to 7 are performed.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the steps of the energy storage system detection method according to any one of claims 1 to 7.

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