CN117895609A - Protection method of energy storage system and energy storage system - Google Patents
Protection method of energy storage system and energy storage system Download PDFInfo
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Abstract
The application relates to a protection method of an energy storage system and the energy storage system. The protection method of the energy storage system is applied to an off-grid mode or a virtual synchronous generator mode of the energy storage system, and comprises the following steps: acquiring a detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value; when the detection parameter value exceeds the detection threshold range, starting shutdown protection timing, wherein the shutdown protection timing has timing duration; and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, executing the shutdown operation. According to the application, the shutdown protection timing is set when the detection parameter value exceeds the detection threshold range, and whether the current detection parameter value continuously exceeds the detection threshold range is judged in the shutdown protection timing process, so that the accuracy of judging whether the energy storage system performs shutdown protection is improved, and the possibility of shutdown caused by accidental shake of the detection parameter is reduced.
Description
Technical Field
The application relates to the technical field of energy sources, in particular to a protection method of an energy storage system and the energy storage system.
Background
When the energy storage system is in the off-grid mode or the virtual synchronous generator mode, whether the energy storage system is in a stable state is generally determined by judging parameters such as real-time active power and the like.
The active power is determined by factors such as load power, frequency, voltage or active set value, so that the active power shakes greatly, and the energy storage system is frequently stopped to influence the production efficiency.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method and an energy storage system that can accurately determine whether the energy storage system is to be shutdown protected.
In one aspect, a protection method of an energy storage system is provided, which is applied to an off-grid mode or a virtual synchronous generator mode of the energy storage system, and includes:
acquiring a detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value;
When the detection parameter value exceeds the detection threshold range, starting shutdown protection timing, wherein the shutdown protection timing has timing duration;
and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, executing the shutdown operation.
In one embodiment, the energy storage system comprises an energy storage converter;
the obtaining the detection parameter value of the energy storage system and the detection threshold range corresponding to the detection parameter value comprises the following steps:
acquiring active power of the energy storage converter and a power threshold corresponding to the active power;
and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, the method comprises the following steps:
And adjusting the charge and discharge power of the energy storage converter.
In one embodiment, the power threshold comprises a charging power threshold;
And when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing comprises:
when the active power is greater than or equal to the charging power threshold value, starting shutdown protection timing;
the adjusting the charge and discharge power of the energy storage converter comprises the following steps:
and reducing the charging power of the energy storage converter.
In one embodiment, the power threshold comprises a discharge power threshold;
And when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing comprises:
When the active power is larger than or equal to the discharge power threshold value, starting shutdown protection timing;
the adjusting the charge and discharge power of the energy storage converter comprises the following steps:
And reducing the load of the energy storage converter.
In one embodiment, the obtaining the active power of the energy storage converter, and the power threshold corresponding to the active power includes:
acquiring the system limit power and the redundancy rate of the energy storage system;
The power threshold is determined based on the system limit power and redundancy factor.
In one embodiment, the energy storage system comprises a battery cluster comprising a plurality of cells;
the obtaining the detection parameter value of the energy storage system and the detection threshold range corresponding to the detection parameter value includes:
acquiring the charge electric quantity and/or the discharge electric quantity of the single battery, and acquiring a first charge threshold value and/or a first discharge threshold value;
and when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing, including:
When the charge electric quantity is greater than or equal to the first charge threshold value and/or the discharge electric quantity is less than or equal to the first discharge threshold value, starting shutdown protection timing;
and when the duration that the detected parameter value continuously exceeds the detection threshold range reaches the timing duration, executing a shutdown operation, including:
And when the duration of the charge electric quantity which is continuously more than or equal to the first charge threshold value reaches the timing duration, and/or the duration of the discharge electric quantity which is continuously less than or equal to the first discharge threshold value reaches the timing duration, executing the shutdown operation.
In one embodiment, when the detected parameter value exceeds the detected threshold range, before starting the shutdown protection timer, the method includes:
determining the maximum value of the charge electric quantity in the battery cluster and/or obtaining the minimum value of the discharge electric quantity in the battery cluster;
acquiring a second charging threshold or a second discharging threshold;
and stopping the operation when the maximum value of the charge electric quantity is larger than or equal to the second charge threshold value or when the minimum value of the discharge electric quantity is smaller than or equal to the second discharge threshold value.
In one embodiment, the second charge threshold is greater than the first charge threshold and the second discharge threshold is less than the first discharge threshold.
In one embodiment, the duration of the shutdown protection timer is less than or equal to 5 seconds.
In one aspect, an energy storage system is provided, which has an off-grid mode or a virtual synchronous generator mode, and is characterized in that the energy storage system comprises a control module, an energy storage converter and/or a battery cluster, and the control module is used for executing the protection method of the energy storage system.
According to the protection method of the energy storage system and the energy storage system, the shutdown protection timing is set when the detection parameter value exceeds the detection threshold range, and whether the current detection parameter value continuously exceeds the detection threshold range is judged in the shutdown protection timing process, so that the accuracy of judging whether the energy storage system performs shutdown protection is improved, and the possibility of shutdown caused by accidental shake of the detection parameter is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a flow chart of a method of protecting an energy storage system provided in one embodiment;
FIG. 2 is a flow chart of a method of protecting an energy storage system provided in another embodiment;
FIG. 3 is a flow chart of a method of protecting an energy storage system provided in yet another embodiment;
FIG. 4 is a schematic diagram of a control system in one embodiment.
For a better description and illustration of embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the accompanying drawings. Additional details or examples used to describe the drawings should not be construed as limiting the scope of the disclosed invention, the presently described embodiments and/or examples, and any of the presently understood modes of carrying out the invention.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The protection method of the energy storage system provided by the application can be applied to a terminal environment. The terminal may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, or internet of things devices.
In one embodiment, as shown in fig. 1, a method for protecting an energy storage system is provided, the energy storage system includes a grid-connected mode, an off-grid mode, and the like, and the method is applied to the off-grid mode or the virtual synchronous generator mode (Virtual Synchronous Generator, VSG) of the energy storage system. In off-grid and virtual synchronous generator modes, the energy storage system lacks real-time monitoring by personnel, and therefore, when an energy storage system anomaly is detected, shutdown protection is required to prevent damage to the energy storage system. The following description will take an example of application of the method to a terminal environment, and the method includes the following steps:
step S100: and acquiring the detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value.
Step S200: and when the detection parameter value exceeds the detection threshold range, starting the shutdown protection timing, wherein the shutdown protection timing has timing duration.
Step S400: and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, executing the shutdown operation.
In step S100, the energy storage system includes an energy storage converter, and the energy storage converter is provided with a battery cluster. The battery cluster comprises a plurality of single batteries. The detection parameter of the energy storage system may include the active power of the energy storage converter, where the value of the active power is the value of the detection parameter.
The detection parameters of the energy storage system may also include the charge of the battery cells. At this time, the value of the electric quantity is the value of the detection parameter.
Of course, the detected parameters of the energy storage system may also include other parameters.
The detection threshold range corresponds to the detection parameter. When the detection parameter of the energy storage system is active power, the detection threshold range is a power range. Specifically, the power range may include a charging power range and a discharging power range. When the detection parameter of the energy storage system is the electric quantity of the single battery, the detection threshold range is the electric quantity threshold. In particular, the power range may include a charge threshold and a discharge threshold.
In step S200, when the detected parameter value exceeds the detection threshold range, it is considered that the energy storage system may fail, and shutdown protection is required.
Meanwhile, in order to eliminate the condition that the detection parameter value exceeds the detection threshold range due to accidental jitter of the detection parameter, a shutdown protection timer is set.
The shutdown protection timing can be preset. As an example, the time duration of the shutdown protection timer may be three seconds or five seconds.
In step S400, the detection parameter value of the energy storage system is continuously acquired while the shutdown protection is timed. And when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, confirming that the energy storage system fails and stopping the energy storage system. It can be understood that the detection parameter value continuously exceeds the detection threshold range until the shutdown protection timing is finished, and at this time, the energy storage system is confirmed to be out of order, and shutdown is needed to prevent other accidents.
Before the stop protection timing is finished, the condition that the detection parameter value is smaller than or equal to the detection threshold range appears, which indicates that the detection parameter value accidentally shakes. At this time, the energy storage system does not need to stop, and then stops the stop protection timing. Of course, the detection parameter values may then be continuously acquired and the above process repeated.
In this embodiment, by setting the shutdown protection timer when the detected parameter value exceeds the detection threshold range, and in the shutdown protection timer process, determining whether the current detected parameter value continuously exceeds the detection threshold range, the accuracy of determining whether the energy storage system performs shutdown protection is improved, and the possibility of shutdown caused by accidental shake of the detected parameter is reduced.
In one embodiment, the energy storage system includes an energy storage converter. Referring to fig. 2, at this time, step S100 includes:
Step S110: and acquiring the active power of the energy storage converter and a power threshold corresponding to the active power.
Meanwhile, before step S400, it includes:
step S300: and adjusting the charge and discharge power of the energy storage converter.
In step S110, the active power of the energy storage converter includes the charging power and the discharging power. Accordingly, the power threshold includes a charge power threshold and a discharge power threshold.
In step S300, the charging and discharging power of the energy storage converter may be adjusted to reduce the charging power and the discharging power of the energy storage converter.
When the energy storage system is judged to be actually faulty, the active power of the energy storage converter cannot be reduced through the charging power and the discharging power of the energy storage converter. In this embodiment, the active power of the energy storage converter can be adjusted by reducing the charging power and the discharging power of the energy storage converter, so that whether the energy storage system fails or not can be further accurately judged in the shutdown protection timing process.
Specifically, in one case, step S200 includes:
Step S210: and the active power is larger than or equal to the charging power threshold value, and the shutdown protection timing is started.
Correspondingly, step S300 includes:
step S310: and reducing the charging power of the energy storage converter.
In another case, step S200 includes:
step S220: and the active power is larger than or equal to the discharge power threshold value, and the shutdown protection timing is started.
Correspondingly, step S300 includes:
Step S320: and the load of the energy storage converter is reduced.
As an example, reducing the charging power of the energy storage converter may be reducing the discharge power of the battery. Reducing the load of the energy storage converter may be reducing the number of loads.
For example, when the energy storage converter includes both the charging power and the discharging power, it may be determined whether the charging power is equal to or greater than the charging power threshold value, and whether the discharging power is equal to or greater than the charging power threshold value, respectively. Of course, it is also possible to determine whether the charging power is equal to or greater than the charging power threshold value, and then determine whether the discharging power is equal to or greater than the charging power threshold value.
And continuously and respectively judging whether the charging power is greater than or equal to a charging power threshold value and/or judging whether the discharging power is greater than or equal to the charging power threshold value in the shutdown protection timing process. And when the charging power is continuously greater than or equal to the charging power threshold value, and/or the discharging power is continuously greater than or equal to the charging power threshold value, stopping the machine.
In the shutdown protection timing process, if the charging power is smaller than or equal to the charging power threshold value or the discharging power is smaller than or equal to the charging power threshold value, the energy storage converter is normal at the moment, and the subsequent steps can be ended.
In one embodiment, step S100 includes:
Step S120: and acquiring the system limit power and the redundancy multiplying power of the energy storage system.
Step S121: a power threshold is determined based on the system limit power and the redundancy factor.
In step S120, as an example, the system limit power may be the battery maximum chargeable/dischargeable power, and the redundancy factor may be the power reduction factor.
In step S121, a product value of the system limit power and the redundancy factor, which is a power threshold, may be calculated.
In the embodiment, the power threshold is determined by the system limit power and the redundancy multiplying power, so that the power threshold is enlarged, and the jitter range of the active power is increased. Meanwhile, the redundancy multiplying power can be preset, the system limit power and the redundancy multiplying power can be changed according to actual conditions, so that the setting of the power threshold is more flexible, and the adaptability of the embodiment is improved.
In one embodiment, referring to fig. 3, the energy storage system includes a battery cluster including a plurality of cells.
At this time, step S100 includes:
Step S130: and acquiring the charge electric quantity and/or the discharge electric quantity of the single battery, and acquiring a first charge threshold and/or a first discharge threshold.
Step S200 includes:
Step S240: and when the charge electric quantity is greater than or equal to the first charge threshold value and/or the discharge electric quantity is less than or equal to the second discharge threshold value, starting shutdown protection timing.
Step S300 includes:
step S330: and when the duration of the charge electric quantity which is continuously larger than or equal to the first charge threshold value reaches the timing duration, and/or the duration of the discharge electric quantity which is continuously smaller than or equal to the first discharge threshold value reaches the timing duration, executing the shutdown operation.
In step S130, the Charge and/or discharge Of the battery cell may be a remaining Charge (SOC) Of the battery cell. The charge amount corresponds to the first charge threshold and the discharge amount corresponds to the first discharge threshold.
As an example, the first charge threshold may be 98% and the first discharge threshold may be 2%. The above values are merely exemplary values, and in practical applications, the first charge threshold and the first discharge threshold are not limited to the above values.
In step S240, the battery cluster includes a plurality of unit batteries. And the charge quantity of any single battery is larger than or equal to a first charge threshold value, and/or the discharge quantity of any single battery is smaller than or equal to a first discharge threshold value, and shutdown protection timing is started.
In step S330, the charging power and/or the discharging power are/is continuously obtained while the shutdown protection is timed, and when the charging power is continuously greater than or equal to the first charging threshold value and/or the discharging power is continuously less than or equal to the first discharging threshold value, it is determined that the energy storage system fails and the shutdown is required.
In this embodiment, whether the energy storage system fails is determined by determining the remaining power of the unit battery. Meanwhile, the embodiment can also be combined with the previous embodiment, namely, the residual electric quantity of the single battery and the active power of the energy storage converter are obtained at the same time, and the judging steps are respectively carried out so as to prevent judging faults of a single method.
In one embodiment, prior to step S240, comprising:
step S230: and determining the maximum value of the charge quantity in the battery cluster and/or acquiring the minimum value of the discharge quantity in the battery cluster.
Step S231: a second charge threshold or a second discharge threshold is obtained.
Step S232: and when the maximum value of the charge electric quantity is larger than or equal to the second charge threshold value, or when the minimum value of the discharge electric quantity is smaller than or equal to the second discharge threshold value, stopping operation is carried out.
In step S230, the battery cluster includes a plurality of unit batteries, and a charge amount and/or a discharge amount of each unit battery is obtained, and a maximum value and/or a minimum value of the charge amount and/or the discharge amount is determined among the plurality of charge amounts and/or discharge amounts.
In step S231, the second charge threshold is greater than the first charge threshold, and the second discharge threshold is less than the first discharge threshold. Specifically, the second charge threshold may be equal to the first charge threshold +1. The second discharge threshold may be equal to the first discharge threshold-1. As an example, when the first charge threshold is 98%, the second charge threshold is 99%. When the first discharge threshold is 2%, the second discharge threshold is 1%.
In step S232, when the maximum value of the charge amount is greater than the second charge threshold, or when the minimum value of the discharge amount is less than the second discharge threshold, it indicates that the energy storage system is faulty and needs to be stopped. At this time, the shutdown protection timing can be directly stopped without starting the shutdown.
In this embodiment, when the maximum value of the charge electric quantity is greater than the second charge threshold value, or when the minimum value of the discharge electric quantity is less than the second discharge threshold value, it may be directly determined that the energy storage system is in failure at this time, and the situation is urgent at this time, so that the shutdown protection timing is not required to be started, and the energy storage system is directly shutdown, thereby improving the protection force to the energy storage system.
It should be understood that, although the steps in the flowcharts of fig. 1-3 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-3 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, an energy storage system is provided having an off-grid mode or a virtual synchronous generator mode. The energy storage system comprises a control module, an energy storage converter and/or a battery cluster, and the control module is connected with the energy storage converter and the battery cluster. The control module is used for executing the protection method of the energy storage system.
As an example, referring to fig. 4, the control module includes an acquisition device, a starting device, and an execution device.
The acquisition device is used for acquiring the detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value.
The starting device is used for starting shutdown protection timing when the detection parameter value exceeds the detection threshold range.
The execution device is used for executing the shutdown operation when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration.
For specific limitations on the devices of the control module, reference may be made to the above limitations on the protection method of the energy storage system, which are not repeated here. The means of the control module may be implemented in whole or in part by software, hardware, or a combination thereof. The above-mentioned control module devices can be embedded in hardware form or can be independent from processor in computer equipment, also can be stored in the memory in the computer equipment in the form of software so as to make the processor call and execute the operation correspondent to the above-mentioned every module.
In one embodiment, a computer device, computer-readable storage medium, or computer program product is provided. A computer device, computer readable storage medium or computer program product may implement the steps of:
step S100: and acquiring the detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value.
Step S200: and when the detection parameter value exceeds the detection threshold range, starting the shutdown protection timing, wherein the shutdown protection timing has timing duration.
Step S400: and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, executing the shutdown operation.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The protection method of the energy storage system is applied to an off-grid mode or a virtual synchronous generator mode of the energy storage system and is characterized by comprising the following steps of:
acquiring a detection parameter value of the energy storage system and a detection threshold range corresponding to the detection parameter value;
When the detection parameter value exceeds the detection threshold range, starting shutdown protection timing, wherein the shutdown protection timing has timing duration;
and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, executing the shutdown operation.
2. The method of claim 1, wherein the energy storage system comprises an energy storage converter;
the obtaining the detection parameter value of the energy storage system and the detection threshold range corresponding to the detection parameter value comprises the following steps:
acquiring active power of the energy storage converter and a power threshold corresponding to the active power;
and when the duration that the detection parameter value continuously exceeds the detection threshold range reaches the timing duration, the method comprises the following steps:
And adjusting the charge and discharge power of the energy storage converter.
3. The method of claim 2, wherein the power threshold comprises a charging power threshold;
And when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing comprises:
when the active power is greater than or equal to the charging power threshold value, starting shutdown protection timing;
the adjusting the charge and discharge power of the energy storage converter comprises the following steps:
and reducing the charging power of the energy storage converter.
4. The method of claim 2, wherein the power threshold comprises a discharge power threshold;
And when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing comprises:
When the active power is larger than or equal to the discharge power threshold value, starting shutdown protection timing;
the adjusting the charge and discharge power of the energy storage converter comprises the following steps:
And reducing the load of the energy storage converter.
5. The method of claim 2, wherein the obtaining the active power of the energy storage converter, and the power threshold corresponding to the active power comprises:
acquiring the system limit power and the redundancy rate of the energy storage system;
The power threshold is determined based on the system limit power and redundancy factor.
6. The method of claim 1, wherein the energy storage system comprises a battery cluster comprising a plurality of cells;
the obtaining the detection parameter value of the energy storage system and the detection threshold range corresponding to the detection parameter value includes:
acquiring the charge electric quantity and/or the discharge electric quantity of the single battery, and acquiring a first charge threshold value and/or a first discharge threshold value;
and when the value of the detection parameter exceeds the detection threshold range, starting shutdown protection timing, including:
When the charge electric quantity is greater than or equal to the first charge threshold value and/or the discharge electric quantity is less than or equal to the first discharge threshold value, starting shutdown protection timing;
and when the duration that the detected parameter value continuously exceeds the detection threshold range reaches the timing duration, executing a shutdown operation, including:
And when the duration of the charge electric quantity which is continuously more than or equal to the first charge threshold value reaches the timing duration, and/or the duration of the discharge electric quantity which is continuously less than or equal to the first discharge threshold value reaches the timing duration, executing the shutdown operation.
7. The method of claim 6, wherein when the detected parameter value exceeds the detection threshold range, prior to initiating a shutdown protection timer, comprising:
determining the maximum value of the charge electric quantity in the battery cluster and/or obtaining the minimum value of the discharge electric quantity in the battery cluster;
acquiring a second charging threshold or a second discharging threshold;
and stopping the operation when the maximum value of the charge electric quantity is larger than or equal to the second charge threshold value or when the minimum value of the discharge electric quantity is smaller than or equal to the second discharge threshold value.
8. The method of claim 7, wherein the second charge threshold is greater than the first charge threshold and the second discharge threshold is less than the first discharge threshold.
9. The method of claim 1, wherein the timed duration is less than or equal to 5 seconds.
10. An energy storage system having an off-grid mode or a virtual synchronous generator mode, wherein the energy storage system comprises a control module, an energy storage converter and/or a battery cluster, the control module being configured to perform the method of protecting the energy storage system of any of claims 1-9.
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