CN109585955B - Backup time guaranteeing method and system for energy storage of data center - Google Patents

Backup time guaranteeing method and system for energy storage of data center Download PDF

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CN109585955B
CN109585955B CN201811638989.3A CN201811638989A CN109585955B CN 109585955 B CN109585955 B CN 109585955B CN 201811638989 A CN201811638989 A CN 201811638989A CN 109585955 B CN109585955 B CN 109585955B
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voltage
battery pack
static
energy storage
charging
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CN109585955A (en
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王大为
吴贤章
王大庆
李春林
陈威
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Zhejiang Nandu Energy Technology Co.,Ltd.
Zhejiang Narada Power Source Co Ltd
Hangzhou Nandu Power Technology Co Ltd
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Zhejiang Nandu Energy Internet Operation Co ltd
Zhejiang Narada Power Source Co Ltd
Hangzhou Nandu Power Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a backup time guarantee method for energy storage of a data center, which comprises the following steps: when the EMS energy storage system is in an energy storage working mode, the working state of the battery pack and the pack voltage of the battery pack are acquired in real time, and the low-voltage limiting protection capacity of the battery pack is acquired according to the working state and the pack voltage of the battery pack; when the group voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack; when the group voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protection layer, judging whether the residual capacity of the battery pack is lower than the capacity value of the first protection layer, if so, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack; and if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer, controlling the EMS to operate in the energy storage mode. The invention can accurately make judgment, so that the EMS energy storage system can switch the working state under the corresponding capacity.

Description

Backup time guaranteeing method and system for energy storage of data center
Technical Field
The invention relates to the technical field of battery management, in particular to a method and a system for guaranteeing back time for energy storage of a data center.
Background
In the application of energy storage in a data center, an EMS (energy Management system) charges and discharges electricity through a UPS/HVDC in different stages of peak electricity, valley electricity and level electricity to obtain peak-valley electricity price difference, but no matter in any time period, the energy storage system of the data center needs to ensure that the standby time of the UPS/HVDC is enough, such as 15 minutes, and the like, namely the EMS system needs to ensure that the standby capacity of a battery pack in the energy storage system of the data center is always more than 15 minutes, and then peak clipping and valley filling of the energy storage system are performed on the basis. The existing data center power supply system has no energy storage function and only has a power supply function, a battery is in a floating charge state by default, the arbitrage of peak-valley electricity price difference every day is not carried out, and an EMS control system does not carry out charge-discharge control on UPS/HVDC.
In data center application, a traditional UPS/HVDC power supply and backup system does not have an energy storage function, and does not have a corresponding control strategy so as to ensure that the energy storage system of the data center can ensure enough power backup time at any time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a system for guaranteeing the back time for energy storage of a data center.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a backup time guaranteeing method for energy storage of a data center comprises the following steps:
when the EMS energy storage system is in an energy storage working mode, the working state of the battery pack and the pack voltage of the battery pack are acquired in real time, and the low-voltage limiting protection capacity of the battery pack is acquired according to the working state and the pack voltage of the battery pack;
when the group voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack;
when the group voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protection layer, judging whether the residual capacity of the battery pack is lower than the capacity value of the first protection layer, if so, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack;
and if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer, controlling the EMS to operate in the energy storage mode.
As an implementation manner, the low-voltage limit protection capacity is set when the EMS energy storage system has an emergency, and when the EMS energy storage system has an emergency, the working state of the battery pack is switched according to the pack voltage and the low-voltage limit protection capacity of the battery pack.
As an implementation manner, the remaining capacity of the battery pack is obtained by means of SOC calibration, and the specific process is as follows:
dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
respectively acquiring the voltage of the battery pack at a certain moment in a first static time period and a second static time period, and recording the voltages as a first static voltage and a second static voltage;
comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding periods change, calibrating the SOC of the corresponding periods, and adjusting a charging system in a charging time period in the corresponding periods to enable the first static voltage and the second static voltage in the corresponding periods to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
As an implementation manner, the battery pack is fully charged in the charging period, the charging coefficient is denoted as a, the battery pack is in a static state in the first static period, the battery pack is discharged in the first discharging period, the discharging power is a, the battery pack is in a static state in the second static period, the battery pack is discharged in the second discharging period, the discharging power is B, and the battery pack is in a static state in the third static period.
As an implementation manner, the adjusting the charging system in the charging time period in the corresponding cycle so that the first static voltage and the second static voltage in the corresponding cycle are respectively consistent with the first static voltage and the second static voltage in the previous cycle includes:
initial charging coefficient a in charging time0Replacing the charge coefficient with other charge coefficients;
collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization;
if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the last power utilization, and setting the replaced charging system as an initial charging coefficient.
A backup time guarantee system for energy storage of a data center comprises a voltage acquisition module, a first judgment module, a second judgment module and a third judgment module;
the voltage acquisition module is used for acquiring the working state of the battery pack and the pack voltage of the battery pack in real time when the EMS energy storage system is in an energy storage working mode, and acquiring the low-voltage limit protection capacity of the battery pack according to the working state and the pack voltage of the battery pack;
the first judgment module is used for controlling the EMS energy storage system to exit the energy storage mode and charging the battery pack when the pack voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer;
the second judging module is used for judging whether the residual capacity of the battery pack is lower than the capacity value of the first protective layer or not when the pack voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protective layer, and if the residual capacity of the battery pack is lower than the capacity value of the first protective layer, the EMS energy storage system is controlled to exit the energy storage mode, and the battery pack is charged;
and the third judgment module is used for controlling the EMS to operate in the energy storage mode if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer.
As an implementation, the voltage acquisition module is configured to: the low-voltage limit protection capacity is set when the EMS energy storage system is in an emergency, and when the EMS energy storage system is in the emergency, the working state of the battery pack is switched according to the pack voltage and the low-voltage limit protection capacity of the battery pack.
As an implementation manner, the second determination module is configured to:
the residual capacity of the battery pack is obtained by means of SOC calibration, and the specific process is as follows:
dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
respectively acquiring the voltage of the battery pack at a certain moment in a first static time period and a second static time period, and recording the voltages as a first static voltage and a second static voltage;
comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding periods change, calibrating the SOC of the corresponding periods, and adjusting a charging system in a charging time period in the corresponding periods to enable the first static voltage and the second static voltage in the corresponding periods to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
As an implementation manner, the second determination module is further configured to: the battery pack is fully charged in a charging time period, the charging coefficient is marked as a, the battery pack is in a static state in a first static time period, the battery pack is discharged in a first discharging time period, the discharging power is A, the battery pack is in a static state in a second static time period, the battery pack is discharged in a second discharging time period, the discharging power is B, and the battery pack is in a static state in a third static time period.
As an implementation manner, the second determination module is further configured to:
during the charging timeInitial charge coefficient a0Replacing the charge coefficient with other charge coefficients;
collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization;
if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the last power utilization, and setting the replaced charging system as an initial charging coefficient.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
the invention provides a backup time guarantee method for energy storage of a data center through a control mode of an EMS controller, which can accurately make judgment and ensure that an EMS energy storage system switches working states under corresponding capacity.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram illustrating multiple protection relationships according to the present invention;
FIG. 2 is a schematic overall flow diagram of the present invention;
fig. 3 is a schematic view of the overall structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
Example 1:
to ensure thatThe reliability of the power supply time of the energy storage system of the data center needs to be ensured by various means at the same time. Firstly, the remaining capacity SOC of the battery pack needs to be accurately calculated, and the SOC of the battery pack needs to be converted by combining the SOH of the battery pack and calculated according to the load factor. However, there is typically an optimum value for the capacity of the battery for energy storage, such as 50% DOD, and typically CStandby power+CEnergy storage< 100%, so ensuring the first layer protection of the backup time is determined by the SOC, which is left with a certain margin, taking into account the energy storage requirements, i.e. Csoc。
Secondly, secondary protection is carried out according to the voltage of the battery pack by considering the SOC calculation error. The battery used for energy storage of the data center is a lead carbon battery, and the battery pack voltage of the battery has certain correlation with the SOC. The voltage value is more visual and is used as the second layer protection, namely Cv。
Finally, considering the unexpected conditions of extreme abnormality of the system and the like, a bottom limit protection value is set at the UPS/HVDC end, even if the EMS system does not exist, the UPS/HVDC can automatically switch the working mode according to the voltage of the battery pack and the protection value preset by the EMS system in advance so as to ensure the reliability of the standby power time, the battery pack voltage bottom limit protection value at the UPS/HVDC end is used as the third-layer protection, and the corresponding capacity is recorded as Cups。
If the capacity for ensuring the standby power time is recorded as CStandby powerThe relationship of the triple protection is shown in fig. 1. And specific process steps need to be referred to below for specific processes.
A backup time guaranteeing method for energy storage of a data center is shown in FIG. 2 and comprises the following steps:
s100, when the EMS energy storage system is in an energy storage working mode, acquiring the working state of the battery pack and the pack voltage of the battery pack in real time, and acquiring the low-voltage limit protection capacity of the battery pack according to the working state and the pack voltage of the battery pack;
s200, when the group voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack;
s300, when the group voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protection layer, judging whether the residual capacity of the battery pack is lower than the capacity value of the first protection layer, if so, controlling the EMS energy storage system to exit an energy storage mode, and charging the battery pack;
and S400, if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer, controlling the EMS to operate in an energy storage mode.
According to the method, the backup time guarantee method for the energy storage of the data center is provided through the control mode of the EMS controller, judgment can be accurately made, and the EMS energy storage system can be switched to work states.
In the above step, the first protective layer capacity is represented as CsocThe capacity of the second protective layer is represented as CvThe capacity of the third protective layer is represented as Cups，
More specifically, the low-voltage-limit protection capacity is set when the EMS energy storage system is in an emergency, and when the EMS energy storage system is in an emergency, the working state of the battery pack is switched according to the pack voltage of the battery pack and the low-voltage-limit protection capacity.
In step S300, the remaining capacity of the battery pack is obtained by means of SOC calibration, which includes the following steps:
s310, dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
s320, respectively acquiring the voltage of the battery pack at a certain moment in the first static time period and the second static time period, and recording the voltage as a first static voltage and a second static voltage;
s330, comparing the first static voltage and the second static voltage acquired in two consecutive power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding period change, calibrating the SOC of the corresponding period, and adjusting a charging system in a charging time period in the corresponding period to enable the first static voltage and the second static voltage in the corresponding period to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
In step S310, the battery pack is fully charged in the charging time period, the charging coefficient is denoted as a, the battery pack is in a static state in the first static time period, the battery pack is discharged in the first discharging time period, the discharging power is a, the battery pack is in a static state in the second static time period, the battery pack is discharged in the second discharging time period, the discharging power is B, and the battery pack is in a static state in the third static time period. More specific segmentation can be seen in the following segmentation manner, charging time period T0(23 hours. about.6 hours)
First rest period T1(7 th ~ 9 th)
First discharge period T2(10 th to 14 th)
Second rest period T3(15 th ~ 17 th)
Second discharge period T4(18 th 20 th)
Third stationary period T5 (21-22 hours)
And aiming at the time of the time period, the user can automatically adjust according to the electricity consumption.
And in the charging time period T0, fully charging the battery pack, wherein the charging coefficient is a, the SOC is 100%, after the first static time period T1, the battery pack is static, discharging is carried out in the first discharging time T2, the set power is A, the second static time period T3 is used, the battery pack is static, then discharging is carried out in the second discharging time period T4, the set power is B, then the third static time period T5 is used, and the charging time period T0 is re-entered, so that the cycle is carried out. The initial set value is a first static voltage and a second static voltage collected in a first power utilization period. That is, after the system is installed, a power cycle is completed on the first day (24 hours), and the first and second rest voltages collected during the power cycle are used as initial set values. And then, acquiring the first static voltage and the second static voltage in other periods, comparing the first static voltage and the second static voltage with the first static voltage and the second static voltage which are acquired most originally respectively to judge whether the SOC is accurate, and if the SOC is not accurate, adjusting the charging coefficient of the charging time period T0 of the whole period to ensure the accuracy of the SOC.
Comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding period change, calibrating the SOC in the corresponding period, so that the SOC can be calculated more accurately, and if the battery pack has good linearity: in a cyclic manner, day 1, day 2. . . . At day N, SOC is the same at some point in time; if the first discharging time period T2 (if 10) SOC is 90% on day 1, the first discharging time period T2 (if 10) SOC should be 90% after day N, and the initial values of the whole cycle are the charging coefficient a, the discharging power a and the discharging power B; however, if the battery pack shows a degradation of the remaining charge SOC due to its own factors (such as aging, corrosion, etc.) as shown in fig. 2, it is necessary to adjust the charging current coefficient during the charging period T0 to ensure the accuracy of the SOC.
The method comprises the following specific steps: collecting the voltage of the battery pack in a first static time period T1(9 hours) and a second static time period T3(16 hours) every day, and respectively recording data as a first static voltage and a second static voltage; and judging whether the first static voltage and the second static voltage of the lower input data are larger or smaller at intervals of a time period, analyzing the data, if the SOC is normal, indicating that the SOC is normal, and if the SOC is changed, adjusting a charging coefficient to ensure the correctness of the SOC.
The method comprises the following specific steps: collecting the voltage of the battery pack in a first static time period T1(9 hours) and a second static time period T3(16 hours) every day, and respectively recording data as a first static voltage and a second static voltage; and judging whether the first static voltage and the second static voltage of the lower input data are larger or smaller at intervals of a time period, analyzing the data, if the SOC is normal, indicating that the SOC is normal, and if the SOC is changed, adjusting a charging coefficient to ensure the correctness of the SOC.
The following detailed steps are how the SOC is calibrated.
In step S330, the adjusting the charging system in the charging time period in the corresponding cycle makes the first static voltage and the second static voltage in the corresponding cycle respectively consistent with the first static voltage and the second static voltage in the previous cycle, and the specific process is as follows:
s331, setting the initial charging coefficient a in the charging time0Replacing the charge coefficient with other charge coefficients;
s332, collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization period;
s333, if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the last power utilization, and setting the replaced charging system as an initial charging coefficient.
Example 2:
a backup time guarantee system for energy storage of a data center, as shown in fig. 3, includes a voltage obtaining module 100, a first determining module 200, a second determining module 300, and a third determining module 400;
the voltage obtaining module 100 is configured to obtain a working state of the battery pack and a pack voltage of the battery pack in real time when the EMS energy storage system is in an energy storage working mode, and obtain a low-voltage limit protection capacity of the battery pack according to the working state of the battery pack and the pack voltage;
the first judging module 200 is configured to, when the pack voltage of the battery pack is lower than a voltage value corresponding to a capacity value of the second protection layer, control the EMS energy storage system to exit the energy storage mode, and charge the battery pack;
the second determining module 300 is configured to determine whether the remaining capacity of the battery pack is lower than the capacity value of the first protection layer when the pack voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protection layer, and if the remaining capacity of the battery pack is lower than the capacity value of the first protection layer, control the EMS energy storage system to exit the energy storage mode, and charge the battery pack;
the third determining module 400 is configured to control the EMS to operate in the energy storage mode if the remaining capacity of the battery pack is not lower than the capacity value of the first protection layer.
Still further, the voltage acquisition module is configured to: the low-voltage limit protection capacity is set when the EMS energy storage system is in an emergency, and when the EMS energy storage system is in the emergency, the working state of the battery pack is switched according to the pack voltage and the low-voltage limit protection capacity of the battery pack.
In this embodiment, the second determining module 300 is configured to: the residual capacity of the battery pack is obtained by means of SOC calibration, and the specific process is as follows:
dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
respectively acquiring the voltage of the battery pack at a certain moment in a first static time period and a second static time period, and recording the voltages as a first static voltage and a second static voltage;
comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding periods change, calibrating the SOC of the corresponding periods, and adjusting a charging system in a charging time period in the corresponding periods to enable the first static voltage and the second static voltage in the corresponding periods to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
The second determining module 300 is further configured to: the battery pack is fully charged in a charging time period, the charging coefficient is marked as a, the battery pack is in a static state in a first static time period, the battery pack is discharged in a first discharging time period, the discharging power is A, the battery pack is in a static state in a second static time period, the battery pack is discharged in a second discharging time period, the discharging power is B, and the battery pack is in a static state in a third static time period.
In more detail, the second determining module 300 is further configured to:
initial charging coefficient a in charging time0Replacing the charge coefficient with other charge coefficients;
collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization;
if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the last power utilization, and setting the replaced charging system as an initial charging coefficient.
The data center energy storage scheme needs to meet 2 large-area requirements on power supply reliability and economy, generally needs to meet the power supply reliability, and then is the economy of energy storage. The traditional data center power supply scheme has no energy storage requirement, the battery pack is in a floating charging state for a long time, and the whole capacity of the battery pack is naturally used for ensuring the power supply reliability. The data center energy storage schemes are different, charging and discharging are carried out every day, and the charging and discharging capacity needs to be accurately controlled, so that the reliability of the standby power time can be guaranteed. The invention provides a backup time guarantee method for energy storage of a data center through a control mode of an EMS controller, which can accurately make judgment and enable an EMS energy storage system to switch working states.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that:
reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (8)

1. A backup time guaranteeing method for energy storage of a data center is characterized by comprising the following steps:
when the EMS energy storage system is in an energy storage working mode, the working state of the battery pack and the pack voltage of the battery pack are acquired in real time, and the low-voltage limiting protection capacity of the battery pack is acquired according to the working state and the pack voltage of the battery pack;
when the group voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack;
when the group voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protection layer, judging whether the residual capacity of the battery pack is lower than the capacity value of the first protection layer, if so, controlling the EMS energy storage system to exit the energy storage mode, and charging the battery pack;
if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer, controlling the EMS to operate in an energy storage mode;
the residual capacity of the battery pack is obtained by means of SOC calibration, and the specific process is as follows:
dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
respectively acquiring the voltage of the battery pack at a certain moment in a first static time period and a second static time period, and recording the voltages as a first static voltage and a second static voltage;
comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding periods change, calibrating the SOC of the corresponding periods, and adjusting a charging system in a charging time period in the corresponding periods to enable the first static voltage and the second static voltage in the corresponding periods to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
2. The backup time guaranteeing method for energy storage of the data center according to claim 1, wherein the low voltage limit protection capacity is set when an emergency occurs in the EMS energy storage system, and when the emergency occurs in the EMS energy storage system, the working state of the battery pack is switched according to the pack voltage of the battery pack and the low voltage limit protection capacity.
3. The method for guaranteeing backup time for energy storage of a data center according to claim 1, wherein the battery pack is fully charged during a charging period, the charging coefficient is denoted as a, the battery pack is in a static state during a first static period, the battery pack is discharged during a first discharging period, the discharging power is a, the battery pack is in a static state during a second static period, the battery pack is discharged during a second discharging period, the discharging power is B, and the battery pack is in a static state during a third static period.
4. The method for guaranteeing backup time for energy storage of a data center according to claim 3, wherein the first static voltage and the second static voltage in the corresponding period are respectively consistent with the first static voltage and the second static voltage in the previous period by adjusting the charging system in the charging period in the corresponding period, and the specific process is as follows:
initial charging coefficient a in charging time0Replacing the charge coefficient with other charge coefficients;
collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization period;
if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization period, and setting the replaced charging system as an initial charging coefficient.
5. A backup time guarantee system for energy storage of a data center is characterized by comprising a voltage acquisition module, a first judgment module, a second judgment module and a third judgment module;
the voltage acquisition module is used for acquiring the working state of the battery pack and the pack voltage of the battery pack in real time when the EMS energy storage system is in an energy storage working mode, and acquiring the low-voltage limit protection capacity of the battery pack according to the working state and the pack voltage of the battery pack;
the first judgment module is used for controlling the EMS energy storage system to exit the energy storage mode and charging the battery pack when the pack voltage of the battery pack is lower than the voltage value corresponding to the capacity value of the second protective layer;
the second judging module is used for judging whether the residual capacity of the battery pack is lower than the capacity value of the first protective layer or not when the pack voltage of the battery pack is not lower than the voltage value corresponding to the capacity value of the second protective layer, and if the residual capacity of the battery pack is lower than the capacity value of the first protective layer, the EMS energy storage system is controlled to exit the energy storage mode, and the battery pack is charged;
the third judging module is used for controlling the EMS to operate in the energy storage mode if the residual capacity of the battery pack is not lower than the capacity value of the first protection layer; the second determination module is configured to:
the residual capacity of the battery pack is obtained by means of SOC calibration, and the specific process is as follows:
dividing each cycle into a plurality of different state time periods according to the electricity utilization use condition of each electricity utilization cycle, wherein the different state time periods comprise a charging time period, a first rest time period, a first discharging time period, a second rest time period, a second discharging time period and a third rest time period;
respectively acquiring the voltage of the battery pack at a certain moment in a first static time period and a second static time period, and recording the voltages as a first static voltage and a second static voltage;
comparing the first static voltage and the second static voltage acquired in two continuous power utilization periods with an initial set value respectively, if the first static voltage and the second static voltage acquired in the corresponding periods change, calibrating the SOC of the corresponding periods, and adjusting a charging system in a charging time period in the corresponding periods to enable the first static voltage and the second static voltage in the corresponding periods to be consistent with the first static voltage and the second static voltage in the previous period respectively so as to enable the acquired residual capacity to be accurate.
6. The backup time support system for energy storage of a data center according to claim 5, wherein the voltage acquisition module is configured to: the low-voltage limit protection capacity is set when the EMS energy storage system is in an emergency, and when the EMS energy storage system is in the emergency, the working state of the battery pack is switched according to the pack voltage and the low-voltage limit protection capacity of the battery pack.
7. The backup time support system for energy storage of a data center according to claim 5, wherein the second determining module is further configured to: the battery pack is fully charged in a charging time period, the charging coefficient is marked as a, the battery pack is in a static state in a first static time period, the battery pack is discharged in a first discharging time period, the discharging power is A, the battery pack is in a static state in a second static time period, the battery pack is discharged in a second discharging time period, the discharging power is B, and the battery pack is in a static state in a third static time period.
8. The backup time support system for energy storage of a data center according to claim 7, wherein the second determining module is further configured to:
initial charging coefficient a in charging time0Replacing the charge coefficient with other charge coefficients;
collecting the first static voltage and the second static voltage again in the next power utilization period, and judging whether the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization period;
if the charging coefficients are the same, setting other charging systems as initial charging coefficients; and if not, continuing to replace until the first static voltage and the second static voltage are respectively the same as the first static voltage and the second static voltage of the previous power utilization period, and setting the replaced charging system as an initial charging coefficient.
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