CN117559627A - UPS maintenance and state monitoring method and system - Google Patents
UPS maintenance and state monitoring method and system Download PDFInfo
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- CN117559627A CN117559627A CN202311570735.3A CN202311570735A CN117559627A CN 117559627 A CN117559627 A CN 117559627A CN 202311570735 A CN202311570735 A CN 202311570735A CN 117559627 A CN117559627 A CN 117559627A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 140
- 238000012544 monitoring process Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 37
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- 238000010586 diagram Methods 0.000 claims description 40
- 238000007599 discharging Methods 0.000 claims description 35
- 230000002829 reductive effect Effects 0.000 claims description 14
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- 230000002238 attenuated effect Effects 0.000 claims description 4
- 238000013500 data storage Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000036541 health Effects 0.000 abstract description 6
- 238000003860 storage Methods 0.000 abstract description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
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Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- 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 relates to the technical field of UPS power supplies, in particular to a UPS maintenance and state monitoring method and system. The method comprises the following steps: when reaching a preset maintenance period, a controllable switch of a mains supply input loop is controlled to be disconnected, and the voltage of the battery pack is monitored; comparing the voltage of the battery pack with a preset lower discharge limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, timely switching back to the mains supply, and charging the battery pack; monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current; and converting the battery maintenance data in the current maintenance period into a waveform chart, analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack, and realizing the on-line monitoring of the health state of the storage battery.
Description
Technical Field
The invention relates to the technical field of UPS power supplies, in particular to a UPS maintenance and state monitoring method and system.
Background
UPS (Uninterruptible Power Supply, uninterrupted power supply) plays a vital role in the operation of the automatic control and monitoring system, and the UPS can ensure the normal operation of the system under the condition of the loss of mains supply, prevent the loss of data and protect the safety of software and hardware of the system. The battery pack is used as a component of the UPS system to directly determine whether the UPS can work normally or not and supply power normally, so that the UPS needs to be charged and discharged regularly to maintain the storage battery in a healthy state.
At present, the UPS is generally discharged manually, namely, the input of alternating current mains supply is manually disconnected, so that the UPS generates alternating current power supply output through the battery pack, and the input of the alternating current mains supply is manually recovered after the battery pack is discharged to a certain degree. However, a UPS is typically installed between devices that do not have long-term operating conditions, and maintenance personnel are not convenient to monitor their operating status in their vicinity for long periods of time, which can cause the UPS to have the following technical problems during discharge of the load: the power supply is not switched back to the commercial power in time after the power supply is manually discharged, so that the electric quantity of the UPS storage battery is discharged, and the UPS output is powered off; the ac power output cannot be normally provided due to a false amount of electricity caused by problems of the battery itself (such as battery aging, battery damage, battery memory effect, etc.). Both conditions can affect the stability and reliability of the UPS system, resulting in sudden shut down of the system, equipment, computers, etc. in the load, affecting safe production, and possibly even leading to significant economic losses. Therefore, there is a need to develop a method or system that can accurately and timely switch back to mains supply and monitor the state of health of the storage battery online.
Disclosure of Invention
The invention provides a UPS maintenance and state monitoring method and system, which aim to at least solve one of the technical problems in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme: a method of UPS maintenance and status monitoring, comprising the steps of:
when reaching the preset maintenance period, the controllable switch of the mains supply input loop is controlled to be disconnected, and the voltage of the battery pack is monitored;
comparing the voltage of the battery pack with a preset lower discharge limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack;
monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current;
storing data of charging and discharging of the battery pack in the current maintenance period, and recording the data as battery maintenance data;
and converting the battery maintenance data into a waveform chart, and analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
The invention controls the disconnection of the controllable switch of the mains supply input loop through the preset maintenance period and monitors and charges and discharges the battery voltage, and the battery voltage can directly reflect the charging state and the residual capacity of the battery, so the residual capacity of the battery can be mastered more accurately by monitoring the battery voltage and comparing with the preset discharging lower limit value, thereby the controllable switch of the mains supply input loop can be switched more timely, the normal work of the load is not influenced by false electric quantity, the condition of UPS output power loss caused by excessive battery discharging is effectively avoided, the manual intervention is reduced, and the stable operation of the UPS system is ensured; by converting the data of charging and discharging the battery pack into the oscillogram and analyzing the abnormal curve of the oscillogram based on the historical maintenance data, the change trend of the battery maintenance data is intuitively displayed, the health state of the battery pack can be judged more accurately, and misjudgment caused by false electric quantity is reduced to a certain extent.
Preferably, the battery voltage is compared with a preset lower discharge limit value, and the controllable switch of the mains supply input circuit is controlled to be closed based on the comparison result, and the battery is charged, including:
calculating the battery capacity of the battery pack, and recording the battery capacity as a first battery capacity;
calculating a battery usable time based on the first battery capacity and the battery pack rated power;
and when the battery available time is reduced to a preset value, comparing the battery pack voltage with a preset discharging lower limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack.
Preferably, calculating the battery availability time based on the first battery capacity and the battery pack rated power includes:
and (3) obtaining a quotient of the first battery capacity and the rated power of the battery pack, and recording the obtained value as the battery available time.
Preferably, the calculating the battery available time based on the first battery capacity and the rated power of the battery pack further includes:
calculating the battery capacity of the battery pack after actual attenuation based on the first battery capacity, and recording the battery capacity as a second battery capacity;
and (5) quotient the second battery capacity and the rated power of the battery pack, and recording the obtained value as the battery available time.
Preferably, the expression for calculating the battery capacity of the battery pack after actual decay based on the first battery capacity is:
C2=(V1-V3)÷(V2-V3)×C1
wherein, C2 represents the second battery capacity, V1 represents the battery voltage measured in the current charge-discharge process, V2 represents the rated voltage of the battery, V3 represents the battery voltage after the battery is actually attenuated after the battery is used for a period of time, and C1 represents the first battery capacity.
Preferably, determining to stop charging the battery pack based on the battery pack voltage and/or the charging current includes:
and stopping charging the battery pack when the voltage of the battery pack reaches a preset saturation voltage and the charging current is smaller than a preset current value.
Preferably, the battery maintenance data is converted into a waveform chart, and the waveform chart is subjected to abnormal curve analysis based on the historical maintenance data to obtain a state monitoring result of the battery pack, including:
converting the battery maintenance data into a waveform diagram, and recording the waveform diagram as a first curve;
determining a standard battery maintenance data waveform diagram based on the historical maintenance data, and marking the standard battery maintenance data waveform diagram as a second curve;
presetting an abnormal range of battery maintenance data, and determining an abnormal upper limit waveform diagram of the battery maintenance data and an abnormal lower limit waveform diagram of the battery maintenance data based on the preset abnormal range on the basis of the second curve, wherein the abnormal upper limit waveform diagram and the abnormal lower limit waveform diagram are respectively marked as a third curve and a fourth curve;
if the first curve is higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is abnormal, and if the first curve is not higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is normal.
Preferably, the method for maintaining and monitoring the state of the UPS comprises the following steps:
the control method comprises the steps of presetting a maintenance period, and when the maintenance period is reached, controlling a controllable switch of a mains supply input loop to be disconnected and monitoring UPS output voltage;
comparing the UPS output voltage with a preset UPS voltage value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging a battery pack;
monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current;
storing data of charging and discharging of the battery pack in the current maintenance period, and recording the data as battery maintenance data;
and converting the battery maintenance data into a waveform chart, and analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
A UPS maintenance and status monitoring system, comprising:
the discharge control module is used for presetting a maintenance period, and controlling a controllable switch of the mains supply input loop to be disconnected when the preset maintenance period is reached;
the data acquisition module is used for monitoring the voltage and/or the charging current of the battery pack;
the charging control module is used for comparing the battery voltage with a preset lower discharging limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, charging the battery, and determining to stop charging the battery based on the battery voltage and/or charging current;
the data storage module is used for storing the data of charging and discharging the battery pack in the current maintenance period and recording the data as battery maintenance data;
the state monitoring module is used for converting the battery maintenance data into a waveform chart, and carrying out abnormal curve analysis on the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
Preferably, the data acquisition module is further used for monitoring relevant electrical data of the UPS and the commercial power;
the UPS maintenance and state monitoring system also comprises an alarm module which is used for automatically alarming when the state monitoring result of the battery pack is abnormal or the data monitored by the data acquisition module exceeds a preset threshold value.
The beneficial technical effects of the invention at least comprise: the UPS maintenance and state monitoring method and system are adopted, the disconnection of the controllable switch of the mains supply input loop is controlled through a preset maintenance period, and the battery pack voltage is monitored and charged and discharged, and as the battery pack voltage can directly reflect the charging state and the residual capacity of a battery, the residual capacity of the battery can be mastered more accurately by monitoring the battery pack voltage and comparing the battery pack voltage with a preset discharging lower limit value, so that the controllable switch of the mains supply input loop can be switched more timely, the condition that the UPS output is lost due to excessive battery discharging is effectively avoided while the normal work of a load is not influenced by false electric quantity, the manual intervention is reduced, and the stable operation of a UPS system is ensured; by converting the data of charging and discharging the battery pack into the oscillogram and analyzing the abnormal curve of the oscillogram based on the historical maintenance data, the change trend of the battery maintenance data is intuitively displayed, the health state of the battery pack can be judged more accurately, and misjudgment caused by false electric quantity is reduced to a certain extent.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a flowchart of a UPS maintenance and status monitoring method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating an anomaly curve analysis according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a UPS maintenance and status monitoring system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The embodiment of the application provides a UPS maintenance and state monitoring method, please refer to fig. 1, which comprises the following steps:
and 102, presetting a maintenance period, and when the maintenance period is reached, controlling a controllable switch of a mains supply input loop to be disconnected and monitoring the voltage of the battery pack.
For example, the preset maintenance period is 3 days, when the preset maintenance period is reached, the controllable switch of the mains supply input loop is controlled to be turned off, so that the original two paths of input voltages (alternating current mains supply and battery pack) of the UPS only remain the battery pack to be supplied with power, the direct current voltage of the battery pack is inverted by the UPS power supply and then supplied to a load for supplying power, the energy of the battery pack is continuously consumed, the battery pack is discharged, and the operation of manually cutting off the mains supply input power before is replaced.
And 104, comparing the voltage of the battery pack with a preset lower discharge limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack.
Wherein the lower discharge limit is the depth of discharge. The preset discharging lower limit value in the embodiment is based on the specification of the battery pack, including capacity, rated voltage, charging and discharging characteristics and the like, and is reasonably set according to the load requirement of practical application and the safety requirement of the battery pack, so that the preset discharging lower limit value meets the continuous power supply of the UPS system in an emergency state.
Specifically, the voltage of the battery pack in the discharging process is monitored in real time, when the voltage of the battery pack is reduced to a preset discharging lower limit value, the battery pack is judged to be discharged to the limit, and a controllable switch of a mains supply input loop is immediately controlled to be closed, so that the UPS resumes alternating current mains supply, and meanwhile, the battery pack is reversely charged.
Step 106, monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current. So far, the maintenance process of the UPS battery pack is completed once.
It will be appreciated that monitoring the battery voltage and/or charging current, determining to stop charging the battery based on the battery voltage and/or charging current, includes the following three cases:
1. and continuing to monitor the battery voltage, and stopping charging the battery when the battery voltage reaches the preset saturation voltage.
2. And monitoring the charging current, and stopping charging the battery pack when the charging current is smaller than a preset current value.
3. And continuously monitoring the voltage of the battery pack and monitoring the charging current, and stopping charging the battery pack when the voltage of the battery pack reaches a preset saturation voltage and the charging current is smaller than a preset current value.
Step 108, storing the data of charging and discharging the battery pack in the current maintenance period, and recording the data as battery maintenance data;
step 110, converting the battery maintenance data into a waveform chart, and analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
Optionally, the method for performing the abnormal curve analysis on the waveform diagram based on the historical maintenance data to obtain the state monitoring result of the battery pack in the present embodiment includes, but is not limited to, the following methods:
1. the threshold detection method comprises the following steps: setting a threshold value, and determining waveform data exceeding the threshold value as abnormality, thereby carrying out abnormal curve analysis.
2. Frequency domain analysis: and converting the waveform diagram into a frequency domain by using a frequency domain analysis method such as Fourier transform and the like for analysis, and identifying abnormal frequency components so as to evaluate the state of the battery pack.
3. Wavelet transformation: the wavelet transformation can decompose the signals into components with different scales, and the wavelet transformation can be used for identifying local abnormal changes in the oscillogram and monitoring the state of the battery pack.
4. And (3) time-frequency analysis: such as short-time fourier transform (STFT) or Continuous Wavelet Transform (CWT), while taking into account the time and frequency characteristics of the signal, to find abnormal changes in the waveform diagram.
According to the embodiment, the disconnection of the controllable switch of the mains supply input loop is controlled through the preset maintenance period, and the battery pack voltage is monitored and charged and discharged, and the battery pack voltage can directly reflect the charging state and the residual capacity of the battery, so that the residual capacity of the battery can be mastered more accurately by monitoring the battery pack voltage and comparing the battery pack voltage with the preset discharging lower limit value, the controllable switch of the mains supply input loop is switched more timely, the condition that the UPS output is lost due to excessive battery discharging is effectively avoided, manual intervention is reduced, the stable operation of a UPS system is ensured, and when the storage battery has false electric quantity caused by aging, the battery pack voltage is quickly reduced and the current is also instantaneously increased after the mains supply is switched to the storage battery power supply, so that the UPS system can quickly respond and immediately switch to the mains supply by monitoring the battery pack voltage and comparing the battery pack voltage with the preset discharging lower limit value, and the normal work of the load is ensured not to be influenced by the false electric quantity; meanwhile, the embodiment intuitively displays the change trend of the battery maintenance data by converting the data of charging and discharging the battery pack into the waveform chart, and analyzes the abnormal curve of the waveform chart based on the historical maintenance data, so that the health state of the battery pack can be judged more accurately, and misjudgment caused by false electric quantity is reduced to a certain extent.
In one embodiment of the present disclosure, comparing a battery voltage with a preset discharge lower limit value, controlling a controllable switch of a mains input loop to be closed based on a comparison result, and charging the battery, includes:
calculating the battery capacity of the battery pack, and recording the battery capacity as a first battery capacity;
calculating a battery usable time based on the first battery capacity and the battery pack rated power;
when the battery available time is reduced to a preset value, the battery voltage is compared with a preset discharging lower limit value, and a controllable switch of the mains supply input loop is controlled to be closed based on a comparison result, and the battery is charged.
In this embodiment, the method for calculating the first battery capacity includes, but is not limited to, the following:
1. static discharge method: by connecting the battery to a known load, the time from full charge to full discharge of the battery is recorded, and the capacity of the battery is calculated from the current versus time.
2. Pulse discharge method: the internal resistance of the battery is measured by pulse discharge, and the capacity of the battery pack is calculated by combining the current and time of discharge pulse.
3. The calculation method comprises the following steps: the capacity of the battery pack is deduced by a mathematical calculation method by carrying out mathematical modeling on the discharge characteristics of the battery pack and combining parameters such as voltage, current, temperature and the like.
4. Internal resistance method: the voltage change of the battery pack is measured by applying different currents to the battery pack, and then the internal resistance of the battery is calculated according to ohm law, so that the capacity of the battery pack is indirectly deduced.
The rated power of the battery pack is generally indicated by a battery manufacturer, and the unit is usually watt (W), and the available time of the battery represents the remaining maintenance time of discharging the battery.
According to the embodiment, the battery available time is compared with the preset value, and then the controllable switch of the mains supply input loop is controlled to be closed based on the comparison result of the battery pack voltage and the preset discharge lower limit value, so that the switching of the mains supply input can be controlled more accurately according to the actual use condition, errors possibly generated by the comparison of the battery pack voltage are avoided, specifically, errors possibly generated by the influence of factors such as the internal resistance of the battery and the temperature are directly generated by the comparison of the battery pack voltage, the error switching caused by voltage fluctuation is avoided, the adverse effect of frequent charging or overdischarge on the service life of the battery is avoided, and the stability and the reliability of the UPS system are improved.
In one embodiment of the present description, calculating a battery availability time based on a first battery capacity and a battery pack power rating includes:
and (5) quotient the first battery capacity and the rated power of the battery pack is obtained, and the obtained value is recorded as the battery available time.
Illustratively, the expression of the present embodiment for calculating the battery availability time is:
T1=C1÷P
where T1 represents a battery available time, a unit may be hours (H), C1 represents a battery capacity of the battery pack, that is, a first battery capacity, a unit may be milliamp hours (mAh), and P represents a rated power of the battery pack, a unit may be watts (W).
It will be appreciated that the battery availability time calculated in this embodiment is typically a battery availability time that does not take into account battery degradation.
In one embodiment of the present specification, calculating the battery available time based on the first battery capacity and the battery pack rated power further includes:
calculating the battery capacity of the battery pack after actual attenuation based on the first battery capacity, and recording the battery capacity as a second battery capacity;
and (5) quotient the second battery capacity and the rated power of the battery pack, and recording the obtained value as the battery available time.
With the increase of the battery service time, the capacity of the battery is gradually reduced, and the actual battery service time is correspondingly reduced, so that the embodiment considers the actual capacity of the battery after the attenuation and calculates the battery service time according to the actual capacity, and the embodiment is more in line with the actual performance characteristics of the battery pack, and further can more accurately control the switching of the mains supply input.
In one embodiment of the present specification, the expression for calculating the battery capacity of the actually attenuated battery pack based on the first battery capacity is:
C2=(V1-V3)÷(V2-V3)×C1
wherein, C2 represents the battery capacity of the battery pack after actual attenuation, i.e. the second battery capacity, V1 represents the battery pack voltage measured during the current charge and discharge, V2 represents the rated voltage of the battery pack, i.e. the full battery voltage set by the factory program, V3 represents the battery pack voltage after the battery is actually attenuated after a period of use, i.e. the full battery voltage after the actual attenuation, and C1 represents the battery capacity of the battery pack under normal conditions, i.e. the first battery capacity.
Wherein v3=v2×d, D represents the attenuation rate, the attenuation rate needs to be estimated according to the actual service time and charging frequency of the battery, for example, the battery of a general new mobile phone is allowed to be charged for more than 1000 times and is normal, and the mobile phone battery is generally considered to be usable when the capacity is greater than or equal to 80%, that is to say, the attenuation rate of charging and discharging reaches 80% about 1000 times.
In one embodiment of the present description, determining to stop charging a battery based on a battery voltage and/or a charging current includes:
and stopping charging the battery pack when the voltage of the battery pack reaches a preset saturation voltage and the charging current is smaller than a preset current value.
The embodiment limits that the battery pack is stopped to be charged only when the battery pack voltage reaches the preset saturation voltage and the charging current is smaller than the preset current value, and compared with the case that the battery pack is stopped to be charged when the battery pack voltage reaches the preset saturation or the battery pack is stopped to be charged when the battery pack voltage is only satisfied and the charging current is smaller than the preset current value, the charging state of the battery can be judged more accurately, misjudgment under a single condition is avoided, the battery pack of the UPS is protected more effectively, and the overcharge condition is avoided.
In one embodiment of the present disclosure, converting battery maintenance data into a waveform chart, performing an abnormal curve analysis on the waveform chart based on historical maintenance data to obtain a status monitoring result of a battery pack, including:
converting the battery maintenance data into a waveform diagram, and recording the waveform diagram as a first curve;
determining a standard battery maintenance data waveform diagram based on the historical maintenance data, and marking the standard battery maintenance data waveform diagram as a second curve;
presetting an abnormal range of battery maintenance data, and determining an abnormal upper limit waveform diagram of the battery maintenance data and an abnormal lower limit waveform diagram of the battery maintenance data based on the preset abnormal range on the basis of a second curve, wherein the abnormal upper limit waveform diagram and the abnormal lower limit waveform diagram are respectively recorded as a third curve and a fourth curve;
if the first curve is higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is abnormal, and if the first curve is not higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is normal.
For example, referring to fig. 2, the implementation manner of this embodiment is:
converting the data of charging and discharging of the battery pack in the current maintenance period into a waveform chart, and recording the waveform chart as a first curve (namely a curve I in fig. 2);
determining a standard battery maintenance data waveform based on the historical maintenance data, denoted as a second curve (i.e., curve ii in fig. 2), wherein determining the standard battery maintenance data waveform based on the historical maintenance data may comprise: cleaning and preprocessing historical maintenance data, extracting features, establishing a mathematical model (a regression model, a clustering model, a time sequence model and the like can be selected), verifying by using the historical data, and determining a standard battery maintenance data waveform diagram according to the verified model, wherein the waveform diagram can reflect typical features and range of the battery maintenance data;
assuming that the abnormal range of the preset battery maintenance data is 10% of the standard curve (namely the second curve) and floats up and down, then determining an abnormal upper limit waveform diagram of the battery maintenance data and an abnormal lower limit waveform diagram of the battery maintenance data, and respectively marking the abnormal upper limit waveform diagram and the abnormal lower limit waveform diagram as a third curve (namely a curve III in fig. 2) and a fourth curve (namely a curve IV in fig. 2);
if the voltage of a certain period of the actual charge-discharge curve (i.e. the first curve) exceeds the range of the two "envelopes" (i.e. the third curve and the fourth curve), we consider that the state of health of the battery corresponding to the actual charge-discharge curve is abnormal, and if the first curve has two points exceeding the third curve in fig. 2, then the state monitoring result of the battery corresponding to the first curve is abnormal.
The presetting of the abnormal range of the battery maintenance data can be set according to the actual load condition.
According to the embodiment, through visual presentation of the waveform diagrams, the trend of the battery maintenance data can be intuitively compared, meanwhile, the third curve and the fourth curve are determined based on the first curve and the preset abnormal range, the monitoring result of the battery pack state is automatically judged according to the relation between the curves, the efficiency of battery pack state monitoring can be improved, timely early warning processing and maintenance are achieved, subjectivity of human judgment is reduced, and abnormal analysis of the battery maintenance data is more accurate.
In one embodiment of the present description, a method for UPS maintenance and status monitoring includes the steps of:
the control method comprises the steps of presetting a maintenance period, and when the maintenance period is reached, controlling a controllable switch of a mains supply input loop to be disconnected and monitoring UPS output voltage;
comparing the UPS output voltage with a preset UPS voltage value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack;
monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current;
storing data of charging and discharging of the battery pack in the current maintenance period, and recording the data as battery maintenance data;
and converting the battery maintenance data into a waveform diagram, and analyzing an abnormal curve of the waveform diagram based on the historical maintenance data to obtain a state monitoring result of the battery pack.
Compared with the embodiment corresponding to fig. 1, the difference is that the embodiment adopts the UPS output voltage as the judgment standard for controlling the controllable switch of the mains input loop to be closed, and the change of the UPS output voltage can directly reflect the condition of the mains input, so that the controllable switch of the mains input loop can be closed relatively timely, the UPS system can effectively recover the ac mains supply when the UPS output changes, and in addition, the stability and the load condition of the UPS output can be more comprehensively considered by monitoring the UPS output voltage and controlling the controllable switch of the mains input loop, so that the control of the mains input loop can be more flexibly performed. The technical scheme provided by the embodiment is beneficial to improving the stability and reliability of the UPS system under the condition of complex power grid environment and load fluctuation.
On the other hand, the embodiment of the present application further provides a UPS maintenance and status monitoring system similar to the foregoing technical concept of a UPS maintenance and status monitoring method, referring to fig. 3, including:
the discharging control module 1 is used for presetting a maintenance period, and when the preset maintenance period is reached, the controllable switch of the mains supply input loop is controlled to be disconnected;
the data acquisition module 2 is used for monitoring the voltage and/or the charging current of the battery pack;
the charging control module 3 is used for comparing the battery voltage with a preset lower discharging limit value, controlling a controllable switch of the mains supply input loop to be closed based on a comparison result, charging the battery, and determining to stop charging the battery based on the battery voltage and/or charging current;
the data storage module 4 is used for storing the data of charging and discharging the battery pack in the current maintenance period and recording the data as battery maintenance data;
the state monitoring module 5 is configured to convert the battery maintenance data into a waveform chart, and perform abnormal curve analysis on the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
In this embodiment, the data acquisition module 2 may be a battery current/voltage measurement circuit, the discharging control module 1, the charging control module 3 and the data storage module 4 may all be a main controller, such as an STM32 series high performance ARM processor, the status monitoring module 5 may use an industrial personal computer or software in the industrial personal computer to perform abnormal curve analysis on the waveform graph and display the abnormal curve on the touch screen in real time, the data acquisition module 2 is connected with the main controller, the main controller is connected with a controllable switch of a mains supply input circuit, and the main controller is in communication connection with the status monitoring module 5.
In one embodiment of the present disclosure, the data collection module 2 is further configured to monitor relevant electrical data of the UPS and the utility power, including, but not limited to, an output voltage, an output current, an output frequency of the UPS, and an input voltage, an input current, an input frequency, and an input power of the utility power;
the UPS maintenance and state monitoring system also comprises an alarm module, which is used for automatically alarming when the state monitoring result of the battery pack is abnormal or the data monitored by the data acquisition module 2 exceeds a preset threshold value.
Alternatively, the alarm module may adopt a buzzer alarm or a screen interface prompt alarm, etc.
In the foregoing, the preferred embodiments disclosed in the present application and the description of the applied technical principles are only preferred, and it should be understood by those skilled in the art that the scope of protection in the present application is not limited to the technical solutions of the specific combination of the technical features, but also covers other technical solutions formed by any combination of the technical features or the equivalent features thereof without departing from the concept of the disclosure. Such as those described above, are mutually substituted with the technical features having similar functions disclosed in the present disclosure (but not limited thereto).
Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Claims (10)
1. A method for UPS maintenance and status monitoring, comprising the steps of:
when reaching the preset maintenance period, the controllable switch of the mains supply input loop is controlled to be disconnected, and the voltage of the battery pack is monitored;
comparing the voltage of the battery pack with a preset lower discharge limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack;
monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current;
storing data of charging and discharging of the battery pack in the current maintenance period, and recording the data as battery maintenance data;
and converting the battery maintenance data into a waveform chart, and analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
2. A method for UPS maintenance and status monitoring as defined in claim 1,
comparing the battery voltage with a preset lower discharge limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery, wherein the method comprises the following steps:
calculating the battery capacity of the battery pack, and recording the battery capacity as a first battery capacity;
calculating a battery usable time based on the first battery capacity and the battery pack rated power;
and when the battery available time is reduced to a preset value, comparing the battery pack voltage with a preset discharging lower limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging the battery pack.
3. A method for UPS maintenance and status monitoring as defined in claim 2,
calculating a battery availability time based on the first battery capacity and the battery pack rated power, comprising:
and (3) obtaining a quotient of the first battery capacity and the rated power of the battery pack, and recording the obtained value as the battery available time.
4. A method for UPS maintenance and status monitoring as defined in claim 2,
calculating a battery availability time based on the first battery capacity and the battery pack rated power, further comprising:
calculating the battery capacity of the battery pack after actual attenuation based on the first battery capacity, and recording the battery capacity as a second battery capacity;
and (5) quotient the second battery capacity and the rated power of the battery pack, and recording the obtained value as the battery available time.
5. A method for UPS maintenance and status monitoring as defined in claim 4,
the expression for calculating the battery capacity of the battery pack after actual decay based on the first battery capacity is:
C2=(V1-V3)÷(V2-V3)×C1
wherein, C2 represents the second battery capacity, V1 represents the battery voltage measured in the current charge-discharge process, V2 represents the rated voltage of the battery, V3 represents the battery voltage after the battery is actually attenuated after the battery is used for a period of time, and C1 represents the first battery capacity.
6. A method for UPS maintenance and status monitoring as defined in claim 1,
determining to stop charging the battery based on the battery voltage and/or charging current, comprising:
and stopping charging the battery pack when the voltage of the battery pack reaches a preset saturation voltage and the charging current is smaller than a preset current value.
7. A method for UPS maintenance and status monitoring as defined in claim 1,
converting the battery maintenance data into a waveform diagram, and carrying out abnormal curve analysis on the waveform diagram based on the historical maintenance data to obtain a state monitoring result of the battery pack, wherein the method comprises the following steps of:
converting the battery maintenance data into a waveform diagram, and recording the waveform diagram as a first curve;
determining a standard battery maintenance data waveform diagram based on the historical maintenance data, and marking the standard battery maintenance data waveform diagram as a second curve;
presetting an abnormal range of battery maintenance data, and determining an abnormal upper limit waveform diagram of the battery maintenance data and an abnormal lower limit waveform diagram of the battery maintenance data based on the preset abnormal range on the basis of the second curve, wherein the abnormal upper limit waveform diagram and the abnormal lower limit waveform diagram are respectively marked as a third curve and a fourth curve;
if the first curve is higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is abnormal, and if the first curve is not higher than the third curve or the first curve is lower than the fourth curve, the state monitoring result of the battery pack is normal.
8. The UPS maintenance and status monitoring method of claim 1, comprising the steps of:
the control method comprises the steps of presetting a maintenance period, and when the maintenance period is reached, controlling a controllable switch of a mains supply input loop to be disconnected and monitoring UPS output voltage;
comparing the UPS output voltage with a preset UPS voltage value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, and charging a battery pack;
monitoring the battery voltage and/or the charging current, and determining to stop charging the battery based on the battery voltage and/or the charging current;
storing data of charging and discharging of the battery pack in the current maintenance period, and recording the data as battery maintenance data;
and converting the battery maintenance data into a waveform chart, and analyzing an abnormal curve of the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
9. A UPS maintenance and status monitoring system, comprising:
the discharge control module is used for presetting a maintenance period, and controlling a controllable switch of the mains supply input loop to be disconnected when the preset maintenance period is reached;
the data acquisition module is used for monitoring the voltage and/or the charging current of the battery pack;
the charging control module is used for comparing the battery voltage with a preset lower discharging limit value, controlling a controllable switch of a mains supply input loop to be closed based on a comparison result, charging the battery, and determining to stop charging the battery based on the battery voltage and/or charging current;
the data storage module is used for storing the data of charging and discharging the battery pack in the current maintenance period and recording the data as battery maintenance data;
the state monitoring module is used for converting the battery maintenance data into a waveform chart, and carrying out abnormal curve analysis on the waveform chart based on the historical maintenance data to obtain a state monitoring result of the battery pack.
10. The UPS maintenance and status monitoring system of claim 9, wherein,
the data acquisition module is also used for monitoring related electrical data of the UPS and the commercial power;
the UPS maintenance and state monitoring system also comprises an alarm module which is used for automatically alarming when the state monitoring result of the battery pack is abnormal or the data monitored by the data acquisition module exceeds a preset threshold value.
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