CN112952875A - User side battery energy storage system protection method, device, equipment and storage medium - Google Patents
User side battery energy storage system protection method, device, equipment and storage medium Download PDFInfo
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- CN112952875A CN112952875A CN202110103737.6A CN202110103737A CN112952875A CN 112952875 A CN112952875 A CN 112952875A CN 202110103737 A CN202110103737 A CN 202110103737A CN 112952875 A CN112952875 A CN 112952875A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention discloses a method, a device, equipment and a storage medium for protecting a battery energy storage system at a user side. A user side battery energy storage system protection method comprises the following steps: continuously collecting the working voltage and the working frequency of a power grid; when the working voltage is larger than or smaller than a preset voltage threshold range, disconnecting a grid-connected switch of the battery energy storage system and a power grid; and when the working frequency is larger than or smaller than the preset frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid. The real-time performance of data can be ensured by continuously acquiring the working voltage and the working frequency of the power grid in real time; when the working voltage is not in the voltage threshold range or the working frequency is not in the frequency threshold range, the grid-connected switch of the battery energy storage system and the power grid is disconnected, so that the influence of the power grid energy storage system on the normal work of the frequency modulation peak regulation equipment of the power grid can be effectively avoided, and the damage to the battery energy storage system caused by low-voltage ride through due to the short circuit of the power grid is avoided.
Description
Technical Field
The embodiment of the invention relates to the power grid regulation and control technology, in particular to a method, a device, equipment and a storage medium for protecting a battery energy storage system at a user side.
Background
With the rapid development of the energy storage technology and the storage battery technology, the battery energy storage is not only applied to the power generation side in a large-scale centralized manner, but also applied to the user side gradually due to the characteristics of small volume and flexible combination of the storage battery.
Through adopting battery energy storage to replace traditional condenser access user side, not only can solve reactive power compensation's problem, can also realize active power compensation. Meanwhile, the system can provide access ports for renewable energy sources such as wind energy, photovoltaic energy and the like, and solves the problem that the voltage and frequency are stable due to the fact that the randomness and the intermittent output change are fast when the renewable energy sources such as the wind energy, the photovoltaic energy and the like are accessed into a power grid. With the increase of the application quantity of the energy storage batteries of the user side later, when the power grid is disturbed, the error adjustment of the battery energy storage system at the user side has certain influence on the stability of the power grid, and simultaneously, the energy storage system is also influenced.
However, at present, the scale of the energy storage system at the user end is very small, and only conventional protections such as overcurrent protection, overload protection, overheat protection, ground protection, voltage protection and the like are generally configured. The influence of system voltage and frequency change on the battery energy storage system caused by power grid system disturbance is not considered, and the power grid and the battery energy storage system are not protected.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for protecting a battery energy storage system at a user side, which are used for realizing auxiliary regulation of voltage and frequency of a power grid and avoiding damage to the battery energy storage system and influence on normal work of frequency modulation and peak regulation equipment of the power grid.
In a first aspect, an embodiment of the present invention provides a method for protecting a user-side battery energy storage system, including:
continuously collecting the working voltage and the working frequency of a power grid;
when the working voltage is larger than or smaller than a preset voltage threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
and when the working frequency is larger than or smaller than a preset frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
Optionally, when the operating voltage is greater than or less than a preset voltage threshold range, disconnecting the grid-connected switch between the battery energy storage system and the power grid includes:
comparing the working voltage with a preset voltage threshold range;
if the working voltage is larger than the voltage threshold range, judging whether the working voltage after the first time period is larger than the voltage threshold range;
if the working voltage after the first time period is longer than the voltage threshold range, disconnecting a grid-connected switch of a battery energy storage system and the power grid;
if the working voltage is smaller than the voltage threshold range, judging whether the working voltage after the second time period length is smaller than the voltage threshold range;
and if the working voltage after the second time period is shorter than the voltage threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
Optionally, the voltage threshold range includes a first voltage threshold range and a second voltage threshold range, and further includes:
if the working voltage is within the first voltage threshold range, judging whether the working voltage delayed for a third time period is within the first voltage threshold range;
if the working voltage after the third time period is within the first voltage threshold range, switching the battery energy storage system to a discharging state;
and if the working voltage is within the second voltage threshold range, the battery energy storage system is not regulated.
Optionally, the first period length includes a first reference time and a second reference time, and the first reference time is greater than the second reference time;
if the working voltage is greater than the voltage threshold range, determining whether the working voltage after a first period of time is greater than the voltage threshold range, including:
if the working voltage is larger than the voltage threshold range and smaller than a first voltage reference value, judging whether the working voltage after the first reference time is larger than the voltage threshold range and smaller than a first voltage reference value;
and if the working voltage is greater than a first voltage reference value, judging whether the working voltage after the second reference time length is greater than the first voltage reference value.
Optionally, when the operating frequency is greater than or less than a preset frequency threshold range, disconnecting the grid-connected switch between the battery energy storage system and the power grid includes:
comparing the working frequency with a preset frequency threshold range;
if the working frequency is larger than the frequency threshold range, judging whether the working frequency after the fourth time period length is larger than the frequency threshold range;
if the working frequency after the fourth time period is longer than the frequency threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
if the working frequency is smaller than the frequency threshold range, judging whether the working frequency after a fifth time period length is smaller than the frequency threshold range;
and if the working frequency after the fifth time period is shorter than the frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
Optionally, the frequency threshold range includes a first frequency threshold range, a second frequency threshold range, and a third frequency threshold range, and further includes:
if the working frequency is within the first frequency threshold range, judging whether the working frequency delayed for a sixth time period is within the first frequency threshold range;
if the working frequency after the sixth time period is within the first frequency threshold range, switching the battery energy storage system to a discharging state;
if the working frequency is within the second frequency threshold range, the battery energy storage system is not regulated;
if the working frequency is within the third frequency threshold range, judging whether the working frequency delayed for a seventh time period is within the third frequency threshold range;
and if the working frequency after the seventh time period is within the third frequency threshold range, switching the battery energy storage system to a charging state.
Optionally, after the grid-connected switch of the battery energy storage system and the power grid is disconnected, the method further includes:
and sending out alarm information.
In a second aspect, an embodiment of the present invention further provides a protection device for a user-side battery energy storage system, including:
the acquisition module is used for continuously acquiring the working voltage and the working frequency of the power grid;
the voltage judgment module is used for disconnecting a grid-connected switch of the battery energy storage system and the power grid when the working voltage is larger than or smaller than a preset voltage threshold range;
and the frequency judgment module is used for disconnecting the grid-connected switch of the battery energy storage system and the power grid when the working frequency is larger than or smaller than a preset frequency threshold range.
In a third aspect, an embodiment of the present invention further provides a user-side battery energy storage system protection device, where the device includes:
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the user-side battery energy storage system protection method according to the first aspect.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the user-side battery energy storage system protection method according to the first aspect.
According to the invention, the real-time performance of data can be ensured by continuously acquiring the working voltage and the working frequency of the power grid in real time, so that the adjustment of the battery energy storage system is more timely, and the response time is effectively shortened; and then comparing the working voltage and the working frequency with a preset voltage threshold range and a preset frequency threshold range, and disconnecting a grid-connected switch of the battery energy storage system and the power grid when the working voltage is not in the voltage threshold range or the working frequency is not in the frequency threshold range, so that the influence of the battery energy storage system on the normal work of the frequency modulation peak regulation equipment of the power grid can be effectively avoided under the condition of ensuring the auxiliary adjustment of the battery energy storage system on the power grid, the working reliability of the battery energy storage system is ensured, the low-voltage ride-through caused by the short circuit of the power grid is avoided, the abnormal voltage and frequency act on the battery energy storage system to damage the battery energy storage system, and the effect of protecting the battery energy storage system is achieved.
Drawings
Fig. 1 is a flowchart of a method for protecting a battery energy storage system on a user side according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for protecting a battery energy storage system on a user side according to a second embodiment of the present invention;
fig. 3 is a structural diagram of a protection device for a battery energy storage system on a user side according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a user-side battery energy storage system protection device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for protecting a battery energy storage system on a user side according to an embodiment of the present invention, where the embodiment is applicable to a situation where a battery energy storage system is used to perform auxiliary adjustment on voltage and frequency of a power grid, and the method may be executed by a protection device for a battery energy storage system on a user side, and specifically includes the following steps:
and step 110, continuously collecting the working voltage and the working frequency of the power grid.
In the embodiment of the invention, the power grid refers to a power grid and is an integral body formed by a substation and a power transmission and distribution line of various voltages in a power system. The system comprises three units of power transformation, power transmission and power distribution. The main tasks of the power grid are to deliver and distribute electrical energy, changing the voltage. When a power grid is used to deliver and distribute electrical energy, it is necessary to operate the power grid at a specified voltage and frequency range.
In specific implementation, the acquisition of the working voltage and the working frequency of the power grid can be obtained in various ways. For example, the acquisition results of the voltage and frequency acquisition devices attached to the operating voltage and operating frequency of the operating equipment of the power grid are directly read; or, the voltage and frequency acquisition device is set to be connected into the power grid to acquire the working voltage and the working frequency of the power grid in real time. In addition, the working voltage and the working frequency of the power grid can be acquired in other modes which can realize the acquisition of the working voltage and the working frequency of the power grid required by the invention.
In a specific implementation, the protection of the battery energy storage system may be triggered when the battery energy storage system is connected to an auxiliary power grid in a power grid, or may be triggered when a grid-connected switch that connects the power grid energy storage system and the power grid is closed.
Step 120, comparing the working voltage with a preset voltage threshold range;
if the operating voltage is greater than or less than the preset voltage threshold range, step 140 is executed.
For the collected working voltage, whether the current working voltage of the power grid meets the adjustable voltage range of the battery energy storage system or not can be judged according to the comparison result with the preset voltage threshold range, namely the preset voltage threshold range is adopted in the invention. In addition, for setting the voltage threshold range, the adjustment capability of the frequency modulation peak regulation equipment of the power grid is considered, the voltage threshold range is set to be smaller than the adjustment triggering condition of the frequency modulation peak regulation equipment, the voltage of the power grid is adjusted in an auxiliary mode before the frequency modulation peak regulation equipment adjusts the voltage of the power grid, and the adjustment is carried out after the frequency modulation peak regulation equipment triggers the operation. Meanwhile, the damage to the battery energy storage system caused by the instantaneous drop of the power grid voltage due to the short-circuit fault of the power grid can be avoided.
if the operating frequency is greater than or less than the predetermined frequency threshold range, step 140 is executed.
For the collected working frequency, whether the current working frequency of the power grid meets the adjustable frequency range of the battery energy storage system or not can be judged according to the comparison result with the preset frequency threshold range, namely the preset frequency threshold range is adopted in the invention. In addition, for setting the frequency threshold range, the adjusting capability of the frequency modulation peak-shaving equipment of the power grid is considered, the frequency threshold range is set to be smaller than the adjusting triggering condition of the frequency modulation peak-shaving equipment, the frequency of the power grid is adjusted in an auxiliary mode before the frequency modulation peak-shaving equipment adjusts the frequency of the power grid, and the adjustment is carried out after the frequency modulation peak-shaving equipment triggers the operation.
And 140, disconnecting a grid-connected switch of the battery energy storage system and the power grid.
In the embodiment of the invention, the battery energy storage system is connected into a power grid through a grid-connected switch to adjust the voltage and the frequency of the power grid. And when the collected working voltage or working frequency of the power grid is larger than a preset threshold range, the grid-connected switch acts to disconnect the battery energy storage system from the power grid, so that the battery energy storage system exits the voltage and frequency adjustment of the power grid.
According to the embodiment of the invention, the working voltage and the working frequency of the power grid are continuously collected in real time, so that the real-time performance of data can be ensured, the adjustment of the battery energy storage system is more timely, and the response time is effectively shortened; and then comparing the working voltage and the working frequency with a preset voltage threshold range and a preset frequency threshold range, and disconnecting a grid-connected switch of the battery energy storage system and the power grid when the working voltage is not in the voltage threshold range or the working frequency is not in the frequency threshold range, so that the influence of the battery energy storage system on the normal work of the frequency modulation peak regulation equipment of the power grid can be effectively avoided under the condition of ensuring the auxiliary adjustment of the battery energy storage system on the power grid, the working reliability of the battery energy storage system is ensured, the low-voltage ride-through caused by the short circuit of the power grid is avoided, the abnormal voltage and frequency act on the battery energy storage system to damage the battery energy storage system, and the effect of protecting the battery energy storage system is achieved.
Example two
Fig. 2 is a flowchart of a method for protecting a battery energy storage system on a user side according to a second embodiment of the present invention, where the present embodiment further adds a comparison and determination process for a working voltage and a working frequency of a power grid based on the foregoing embodiment. The method specifically comprises the following steps:
step 201, continuously collecting the working voltage and the working frequency of the power grid.
In the embodiment of the invention, the acquisition of the working voltage and the working frequency of the power grid can be acquired in various ways. The specific acquisition process is similar to that of step 110 in the first embodiment, and reference may be made to the description part in step 110 in the first embodiment, which is not repeated herein.
if the working voltage is greater than the voltage threshold range, go to step 203;
if the working voltage is smaller than the voltage threshold range, go to step 204;
if the operating voltage is within the voltage threshold range, step 205 is executed.
if the working voltage after the first period of time is greater than the voltage threshold range, executing step 215 to disconnect a grid-connected switch of the battery energy storage system and the power grid;
if the working voltage after the first period of time is not greater than the voltage threshold range, the step 201 is executed again.
In the specific implementation, when the collected working voltage of the power grid is larger than the voltage threshold range, whether the working voltage of the power grid is still larger than the voltage threshold range is compared again after the first time period is delayed, so that a judgment error caused by instantaneous fluctuation of the working voltage of the power grid is avoided.
In the embodiment of the present invention, the collection of the working voltage of the power grid may be continuous collection, and the working voltage of the power grid is determined in real time, when it is detected that the working voltage is greater than the voltage threshold range, the first time period is delayed to collect the working voltage of the power grid again, and it is determined whether the working voltage of the power grid after the first time period is still greater than the voltage threshold range, if so, the subsequent step 215 is executed to disconnect the grid-connected switch of the battery energy storage system and the power grid, and disconnect the battery energy storage system and the power grid.
The battery energy storage system is disconnected with the power grid when the working voltage of the power grid is larger than the voltage threshold range, so that the damage of the battery energy storage system caused by the overlarge working voltage of the power grid can be avoided, the auxiliary adjustment of the working voltage of the power grid caused by the fact that the battery energy storage system still works when the working voltage of the power grid is overlarge can be avoided, the misjudgment of the power grid frequency modulation peak shaving equipment of the power grid is caused, the normal work cannot be carried out, and the accurate adjustment of the working voltage of the power grid is carried out, and even more loss is brought. The battery energy storage system operating according to the mode can perform auxiliary adjustment on the working voltage of the power grid when the working voltage of the power grid fluctuates, and can also quit working when the working voltage of the power grid fluctuates greatly, so that the connection with the power grid is disconnected, the influence on the normal working judgment of the frequency modulation and peak regulation equipment of the power grid is avoided, and the stability of the working voltage of the power grid is effectively ensured.
Illustratively, the voltage threshold range is 0.5Un-1.1Un, where "Un" is the grid rated voltage of the grid-connected point, i.e., the voltage threshold range is between 0.5 times the grid rated voltage and 1.1 times the grid rated voltage. The range of the voltage threshold value is larger than 1.1 times of rated voltage of the power grid.
In a specific embodiment, the first time period length includes a first reference time and a second reference time, and the first reference time is greater than the second reference time. Step 203 comprises:
step 2031, determining whether the working voltage after the first period of time is greater than the voltage threshold range and less than a first voltage reference value;
if the operating voltage is greater than the voltage threshold range and less than the first voltage reference value, go to step 2032;
if the operating voltage is greater than the first voltage reference value, go to step 2033;
step 2032, determining whether the working voltage after the first reference time is greater than the voltage threshold range and less than the first voltage reference value;
step 2033, determining whether the working voltage after the second reference time length is greater than the first voltage reference value.
In this embodiment, the working voltage of the power grid which is greater than the voltage threshold range is further subdivided, whether the working voltage of the power grid is greater than the first voltage reference value is judged, and when the working voltage of the power grid is in different size ranges, the acquisition judgment time of the working voltage of the power grid is further divided, so that different time lengths are delayed. The operation can subdivide the delay time under different working voltages, avoid the damage to the battery energy storage system caused by the long-time access of the battery energy storage system to the power grid when the working voltage of the power grid is greater than the first voltage reference value, and simultaneously avoid the misjudgment problem caused by insufficient time when the working voltage of the power grid is less than the first voltage reference value, and avoid the regulation and control that the battery energy storage system caused by instantaneous too-high fluctuation is disconnected from the power grid too early.
Illustratively, 1.2Un is used as a first voltage reference value, the first reference time is 1500ms, the second reference time is 500ms, and when the operating voltage of the power grid is greater than the voltage threshold range 0.5Un-1.1Un and less than the first voltage reference value, that is, the operating voltage of the power grid is 1.1Un-1.2Un, it is determined again whether the operating voltage is still between 0.5Un-1.1Un after the first reference time is delayed. When the working voltage of the power grid is larger than the first voltage reference value 1.2Un, delaying the second reference time and then judging whether the working voltage is still larger than the first voltage reference value 1.2Un or not again, wherein the first reference time is larger than the second reference time.
if the working voltage after the second time period is less than the voltage threshold range, executing step 215 to disconnect a grid-connected switch of the battery energy storage system and the power grid;
if the operating voltage after the second time period is no longer less than the voltage threshold range, the process returns to step 201.
In the embodiment of the invention, when the working voltage of the power grid is smaller than the voltage threshold range, the working voltage is detected again after the time delay for the second time period length, and the grid-connected switch of the battery energy storage system and the power grid is disconnected when the working voltage of the power grid is still smaller than the voltage threshold range, so that the connection between the battery energy storage system and the power grid is disconnected, and the battery energy storage system is disconnected from working.
When the working voltage of the power grid is smaller than the voltage threshold range, the battery energy storage system is disconnected from the power grid, the battery energy storage system can be effectively prevented from still participating in the adjustment of the working voltage of the power grid under the condition that the working voltage of the power grid is relatively low, and the phenomenon that the judgment of the original power grid frequency modulation peak shaving equipment of the power grid can be started to form influence and the power grid frequency modulation peak shaving equipment cannot timely adjust the working voltage of the power grid is avoided. And when the working voltage of the power grid is low to a certain degree, the regulation capacity of the battery energy storage system is not enough to realize the regulation of the working voltage of the power grid, and the regulation capacity still participates in the regulation of the working voltage of the power grid, so that the judgment of the frequency modulation and peak regulation equipment of the power grid is influenced, and the battery energy storage system is easily damaged.
Illustratively, the second slot length is 350 ms.
In a specific embodiment of the present invention, the voltage threshold range may include a first voltage threshold range and a second voltage threshold range.
Illustratively, the first voltage threshold range is 0.5Un-0.85Un, the second voltage threshold range is 0.85Un-1.1Un, and the third time period is 100ms in length.
if the operating voltage is within the first voltage threshold range, go to step 206;
and if the working voltage is within the second voltage threshold range, returning to execute the step 201 to not regulate and control the battery energy storage system.
That is to say, when the detected working voltage of the power grid is within the second voltage threshold range, the operation of the battery energy storage system is not interfered, so that the battery energy storage system operates under the original operation mechanism and participates in the regulation of the working voltage of the power grid.
if the working voltage after the third time period is within the first voltage threshold range, step 213 is executed to switch the battery energy storage system to a discharging state;
and if the working voltage after the third time period is not within the first voltage threshold range, returning to execute the step 201.
When the working voltage of the power grid is continuously detected to be within the first voltage threshold range, the working voltage of the power grid is continuously low, and at the moment, the battery energy storage system is adjusted to enable the battery energy storage system to work in a discharging state all the time to participate in the adjustment of the working voltage of the power grid.
if the operating frequency is greater than the frequency threshold range, go to step 208;
if the operating frequency is less than the frequency threshold range, go to step 209;
if the operating frequency is within the frequency threshold range, go to step 210;
if the working frequency after the fourth time period is longer than the frequency threshold range, executing step 215 to disconnect the grid-connected switch of the battery energy storage system and the power grid;
if the operating frequency after the fourth period of time is not greater than the frequency threshold range, the process returns to step 201.
In the embodiment of the invention, the collection of the working frequency of the power grid and the collection of the working voltage can be continuous collection, and the working frequency of the power grid is judged in real time. When the working frequency is detected to be larger than the frequency threshold range, the working frequency of the power grid is collected again after the second time period is delayed, whether the working frequency of the power grid after the second time period is still larger than the frequency threshold range is judged, if yes, the subsequent step 215 is executed to disconnect the grid-connected switch of the battery energy storage system and the power grid, and the battery energy storage system is separated from the power grid.
When the working frequency of the power grid is larger than the frequency threshold range, the battery energy storage system is separated from the power grid, so that the problem that the working frequency of the power grid cannot be adjusted accurately due to misjudgment of power grid frequency modulation peak regulation equipment of the power grid due to the fact that the battery energy storage system still works to adjust the working frequency of the power grid when the working frequency of the power grid is too large can be avoided. The battery energy storage system operating according to the mode can assist in adjusting the working frequency of the power grid when the working frequency of the power grid fluctuates, and can quit working when the working frequency of the power grid fluctuates greatly, so that the connection with the power grid is disconnected, the influence on the normal working judgment of the frequency modulation and peak regulation equipment of the power grid is avoided, and the stability of the working frequency of the power grid is effectively ensured.
Illustratively, the predetermined frequency threshold range is 48Hz-50.5 Hz.
if the working frequency after the fifth time period is less than the frequency threshold range, executing step 215 to disconnect a grid-connected switch of the battery energy storage system and the power grid;
if the operating frequency after the fifth time period is not less than the frequency threshold range, the process returns to step 201.
In the embodiment of the invention, when the working frequency of the power grid is smaller than the frequency threshold range, the working frequency is detected again after the second time period is delayed for a second time period, and the grid-connected switch of the battery energy storage system and the power grid is disconnected when the working frequency of the power grid is still smaller than the frequency threshold range, so that the battery energy storage system is disconnected from the power grid, and the battery energy storage system is disconnected from working.
In the embodiment of the present invention, the frequency threshold range includes a first frequency threshold range, a second frequency threshold range, and a third frequency threshold range, that is, the frequency threshold range is divided into the first frequency threshold range, the second frequency threshold range, and the third frequency threshold range.
Illustratively, the first frequency threshold range is 48Hz-49.5Hz, the second frequency threshold range is 49.5Hz < f <50.2Hz, and the third frequency threshold range is 50.2Hz-50.5 Hz.
if the operating frequency is within the first frequency threshold range, step 211 is executed to determine whether the operating frequency delayed by the sixth time period is within the first frequency threshold range;
if the working frequency is within the second frequency threshold range, returning to execute the step 201 to not regulate and control the battery energy storage system;
if the operating frequency is within the third frequency threshold range, step 212 is executed to determine whether the operating frequency delayed by the seventh time period is within the third frequency threshold range.
The frequency threshold range is divided into a first frequency threshold range, a second frequency threshold range and a third frequency threshold range, and the battery energy storage system of the power grid is controlled to work in different states according to the working frequency of the power grid, so that the working frequency of the power grid can be adjusted in a targeted manner, and the adjustment of the working frequency of the auxiliary power grid is achieved.
Step 211, judging whether the working frequency delayed by the sixth time period length is within the first frequency threshold range;
if the working frequency after the sixth time period is within the first frequency threshold range, step 213 is executed to switch the battery energy storage system to a discharging state;
and if the operating frequency after the sixth time period is within the first frequency threshold range, returning to execute step 201.
if the working frequency after the seventh time period is within the third frequency threshold range, step 214 is executed to switch the battery energy storage system to the charging state;
and if the working frequency after the seventh time period is not within the third frequency threshold range, returning to execute the step 201.
In specific implementation, when the working frequency is within a first frequency threshold range or within a first frequency threshold range, the working frequency of the power grid is low or high, and at the moment, the battery energy storage system is controlled to be switched to a discharging state or charged, so that the working frequency of the power grid is adjusted, and the working frequency of the power grid can be more stable.
Illustratively, the fourth time period length, the fifth time period length, the sixth time period length, and the seventh time period length are 100 ms.
And step 214, switching the battery energy storage system to a charging state.
And 215, disconnecting a grid-connected switch of the battery energy storage system and the power grid.
And step 216, sending out alarm information.
In the specific implementation, when the working voltage or the working frequency of the power grid exceeds the preset voltage threshold range or frequency threshold range, the grid-connected switch for connecting the battery energy storage system and the power grid is controlled to be disconnected, so that the battery energy storage system is disconnected from the power grid, the regulation of the power grid is quitted, the influence on the normal work of the power grid frequency modulation peak shaving equipment of the power grid is avoided, the battery energy storage system is protected from working for a long time under the power grid environment exceeding the preset voltage threshold range or frequency threshold range, and the service life of the battery energy storage system is ensured.
EXAMPLE III
Fig. 3 is a structural diagram of a protection device for a battery energy storage system on a user side according to a third embodiment of the present invention. The device includes: the device comprises an acquisition module 31, a voltage judgment module 32, a frequency judgment module 33 and an alarm module 34. Wherein:
the acquisition module 31 is used for continuously acquiring the working voltage and the working frequency of the power grid;
the voltage judgment module 32 is used for disconnecting a grid-connected switch of the battery energy storage system and the power grid when the working voltage is larger than or smaller than a preset voltage threshold range;
and the frequency judging module 33 is configured to disconnect a grid-connected switch between the battery energy storage system and the power grid when the working frequency is greater than or less than a preset frequency threshold range.
The voltage determination module 32 includes:
the voltage comparison unit is used for comparing the working voltage with a preset voltage threshold range;
if the working voltage is larger than the voltage threshold range, judging whether the working voltage after the first time period is larger than the voltage threshold range;
if the working voltage after the first time period is longer than the voltage threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
if the working voltage is smaller than the voltage threshold range, judging whether the working voltage after the second time period length is smaller than the voltage threshold range;
and if the working voltage after the second time period is shorter than the voltage threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
The voltage threshold range comprises a first voltage threshold range and a second voltage threshold range, and further comprises:
if the working voltage is within the first voltage threshold range, judging whether the working voltage delayed for the third time period is within the first voltage threshold range;
if the working voltage after the third time period is within the first voltage threshold range, switching the battery energy storage system to a discharging state;
and if the working voltage is within the second voltage threshold range, the battery energy storage system is not regulated.
The first time interval comprises a first reference time and a second reference time, and the first reference time is greater than the second reference time;
the voltage comparison unit includes:
the reference voltage comparison subunit is used for comparing the working voltage with a first voltage reference value;
if the working voltage is larger than the voltage threshold range and smaller than the first voltage reference value, judging whether the working voltage after the first reference time is larger than the voltage threshold range and smaller than the first voltage reference value;
and if the working voltage is greater than the first voltage reference value, judging whether the working voltage after the second reference time length is greater than the first voltage reference value.
The frequency judging module 33 includes:
the frequency comparison unit is used for comparing the working frequency with a preset frequency threshold range;
if the working frequency is larger than the frequency threshold range, judging whether the working frequency after the fourth time period length is larger than the frequency threshold range;
if the working frequency after the fourth time period is longer than the frequency threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
if the working frequency is smaller than the frequency threshold range, judging whether the working frequency after the fifth time period length is smaller than the frequency threshold range;
and if the working frequency after the fifth time period is shorter than the frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
The frequency threshold range includes a first frequency threshold range, a second frequency threshold range, a third frequency threshold range, and further includes:
if the working frequency is within the first frequency threshold range, judging whether the working frequency delayed by the sixth time period length is within the first frequency threshold range;
if the working frequency after the sixth time period is within the range of the first frequency threshold, switching the battery energy storage system to a discharging state;
if the working frequency is within the range of the second frequency threshold, the battery energy storage system is not regulated;
if the working frequency is within the third frequency threshold range, judging whether the working frequency delayed by the seventh time period length is within the third frequency threshold range;
and if the working frequency after the seventh time period is within the third frequency threshold range, switching the battery energy storage system to a charging state.
And the alarm module 34 is used for sending alarm information.
The user side battery energy storage system protection device provided by the embodiment of the invention can execute the user side battery energy storage system protection method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of a user-side battery energy storage system protection device according to a fourth embodiment of the present invention. As shown in fig. 4, the electronic apparatus includes a processor 40, a memory 41, a communication module 42, an input device 43, and an output device 44; the number of the processors 40 in the electronic device may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, the communication module 42, the input device 43 and the output device 44 in the electronic device may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.
The memory 41 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as modules corresponding to a method for protecting a user-side battery energy storage system in the present embodiment (for example, the collecting module 31, the voltage determining module 32, the frequency determining module 33, and the alarm module 34 in a device for protecting a user-side battery energy storage system). The processor 40 executes various functional applications and data processing of the electronic device by running software programs, instructions and modules stored in the memory 41, so as to implement the above-mentioned user-side battery energy storage system protection method.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
And the communication module 42 is used for establishing connection with the display screen and realizing data interaction with the display screen. The input device 43 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the electronic apparatus.
The user-side battery energy storage system protection device provided by this embodiment of the present invention can perform the user-side battery energy storage system protection method provided by any embodiment of the present invention, and has corresponding functions and advantages.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform a method for protecting a user-side battery energy storage system, where the method includes:
continuously collecting the working voltage and the working frequency of a power grid;
when the working voltage is larger than or smaller than a preset voltage threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
and when the working frequency is larger than or smaller than a preset frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
Of course, the storage medium containing the computer-executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in a method for protecting a user-side battery energy storage system provided in any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer electronic device (which may be a personal computer, a server, or a network electronic device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the device for processing the battery energy storage system at the user side, the units and modules included in the device are only divided according to the functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A user side battery energy storage system protection method is characterized by comprising the following steps:
continuously collecting the working voltage and the working frequency of a power grid;
when the working voltage is larger than or smaller than a preset voltage threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
and when the working frequency is larger than or smaller than a preset frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
2. The method for protecting the user-side battery energy storage system according to claim 1, wherein the disconnecting of the grid-connected switch between the battery energy storage system and the power grid when the working voltage is greater than or less than a preset voltage threshold range comprises:
comparing the working voltage with a preset voltage threshold range;
if the working voltage is larger than the voltage threshold range, judging whether the working voltage after the first time period is larger than the voltage threshold range;
if the working voltage after the first time period is longer than the voltage threshold range, disconnecting a grid-connected switch of a battery energy storage system and the power grid;
if the working voltage is smaller than the voltage threshold range, judging whether the working voltage after the second time period length is smaller than the voltage threshold range;
and if the working voltage after the second time period is shorter than the voltage threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
3. The method of claim 2, wherein the voltage threshold ranges comprise a first voltage threshold range, a second voltage threshold range, and further comprising:
if the working voltage is within the first voltage threshold range, judging whether the working voltage delayed for a third time period is within the first voltage threshold range;
if the working voltage after the third time period is within the first voltage threshold range, switching the battery energy storage system to a discharging state;
and if the working voltage is within the second voltage threshold range, the battery energy storage system is not regulated.
4. The user-side battery energy storage system protection method according to claim 2, wherein the first period of time includes a first reference time and a second reference time, and the first reference time is greater than the second reference time;
if the working voltage is greater than the voltage threshold range, determining whether the working voltage after a first period of time is greater than the voltage threshold range, including:
if the working voltage is larger than the voltage threshold range and smaller than a first voltage reference value, judging whether the working voltage after the first reference time is larger than the voltage threshold range and smaller than a first voltage reference value;
and if the working voltage is greater than a first voltage reference value, judging whether the working voltage after the second reference time length is greater than the first voltage reference value.
5. The method for protecting the user-side battery energy storage system according to claim 1, wherein the disconnecting of the grid-connected switch between the battery energy storage system and the power grid when the working frequency is greater than or less than a preset frequency threshold range comprises:
comparing the working frequency with a preset frequency threshold range;
if the working frequency is larger than the frequency threshold range, judging whether the working frequency after the fourth time period length is larger than the frequency threshold range;
if the working frequency after the fourth time period is longer than the frequency threshold range, disconnecting a grid-connected switch of the battery energy storage system and the power grid;
if the working frequency is smaller than the frequency threshold range, judging whether the working frequency after a fifth time period length is smaller than the frequency threshold range;
and if the working frequency after the fifth time period is shorter than the frequency threshold range, disconnecting the grid-connected switch of the battery energy storage system and the power grid.
6. The method of claim 5, wherein the frequency threshold range comprises a first frequency threshold range, a second frequency threshold range, a third frequency threshold range, and further comprising:
if the working frequency is within the first frequency threshold range, judging whether the working frequency delayed for a sixth time period is within the first frequency threshold range;
if the working frequency after the sixth time period is within the first frequency threshold range, switching the battery energy storage system to a discharging state;
if the working frequency is within the second frequency threshold range, the battery energy storage system is not regulated;
if the working frequency is within the third frequency threshold range, judging whether the working frequency delayed for a seventh time period is within the third frequency threshold range;
and if the working frequency after the seventh time period is within the third frequency threshold range, switching the battery energy storage system to a charging state.
7. The method for protecting the battery energy storage system at the user side according to claim 1, further comprising, after disconnecting a grid-connected switch between the battery energy storage system and the grid:
and sending out alarm information.
8. A user side battery energy storage system protection device, comprising:
the acquisition module is used for continuously acquiring the working voltage and the working frequency of the power grid;
the voltage judgment module is used for disconnecting a grid-connected switch of the battery energy storage system and the power grid when the working voltage is larger than or smaller than a preset voltage threshold range;
and the frequency judgment module is used for disconnecting the grid-connected switch of the battery energy storage system and the power grid when the working frequency is larger than or smaller than a preset frequency threshold range.
9. A user-side battery energy storage system protection device, the device comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the user-side battery energy storage system protection method of any of claims 1-7.
10. A storage medium containing computer-executable instructions for performing the user-side battery energy storage system protection method of any one of claims 1-7 when executed by a computer processor.
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| CN107255745A (en) * | 2017-06-28 | 2017-10-17 | 华自科技股份有限公司 | Voltage measurement method, device, storage medium and its computer equipment |
| CN109193728A (en) * | 2018-10-30 | 2019-01-11 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of energy-storage system active frequency modulation closed loop control method |
| CN111092429A (en) * | 2019-12-23 | 2020-05-01 | 国网北京市电力公司 | Optimized scheduling method of flexible interconnected power distribution network, storage medium and processor |
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| CN109120002A (en) * | 2018-10-26 | 2019-01-01 | 西门子工厂自动化工程有限公司 | Transformation system, energy-storage system, dispatching method and machine readable media |
| CN110492512B (en) * | 2019-09-12 | 2020-10-23 | 合肥工业大学 | Control method for frequency modulation or peak regulation mode in optical storage combined system |
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| CN107255745A (en) * | 2017-06-28 | 2017-10-17 | 华自科技股份有限公司 | Voltage measurement method, device, storage medium and its computer equipment |
| CN109193728A (en) * | 2018-10-30 | 2019-01-11 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of energy-storage system active frequency modulation closed loop control method |
| CN111092429A (en) * | 2019-12-23 | 2020-05-01 | 国网北京市电力公司 | Optimized scheduling method of flexible interconnected power distribution network, storage medium and processor |
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