CN116742780B - Intelligent emergency power supply - Google Patents
Intelligent emergency power supply Download PDFInfo
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- CN116742780B CN116742780B CN202310721599.7A CN202310721599A CN116742780B CN 116742780 B CN116742780 B CN 116742780B CN 202310721599 A CN202310721599 A CN 202310721599A CN 116742780 B CN116742780 B CN 116742780B
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- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 239000000178 monomer Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
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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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an intelligent emergency power supply, which relates to the technical field of power supplies and comprises a detection module, a charging module, a storage battery, an automatic change-over switch, a controller and an inverter; and the controller analyzes and obtains the distribution characteristics which are met by the output voltage data of the utility power grid based on the output voltage data of the utility power grid by utilizing the detection module, and realizes fault prediction according to the distribution characteristics, and then the controller controls the automatic change-over switch to realize automatic change-over of the emergency power supply and the utility power, so that the emergency power supply is provided when the short-time utility power is interrupted.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to an intelligent emergency power supply.
Background
At present, in the building electrical field and other emergency power supply occasions, when alternating current power supply is powered off, an emergency power supply needs to be started in order to ensure the power safety. However, the emergency power supply is usually started in a manual stage, namely, the emergency power supply is manually started after power failure. In addition, the monitoring of the emergency power supply, the commercial power and the conversion between the emergency power supply and the commercial power is not intelligent enough, and most of the monitoring depends on manual inspection, so that the circuit fault cannot be found timely and accurately, and various power utilization problems are caused.
Therefore, how to realize automatic switching between the emergency power supply and the utility power is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides an intelligent emergency power supply to solve the problems in the background art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an intelligent emergency power supply comprising: the device comprises a detection module, a charging module, a storage battery, an automatic change-over switch, a controller and an inverter;
the detection module detects the output voltage of the commercial power grid and sends the output voltage to the controller;
the controller receives the mains voltage, judges whether the mains voltage is normal, and simultaneously controls the automatic change-over switch and the on-off switch of the charging unit;
A storage battery storing electric energy and discharging the electric energy;
the inverter converts direct current into alternating current, and keeps the voltage, frequency and phase of the electric energy output by the storage battery consistent with the height of the power grid;
The charging module inverts and decompresses the commercial power to charge the storage battery;
and the automatic switching module is used for switching the power supply lines of the commercial power and the external emergency power supply.
Optionally, the controller includes: the system comprises a voltage receiving module, a voltage processing module and a fault prediction module; wherein,
The voltage receiving module is used for receiving the output voltage of the commercial power grid sent by the detecting module;
The voltage processing module is used for obtaining a voltage output interval of the commercial power grid in a normal working state by executing the following operations:
continuously collecting voltage samples X 1,X2,...,Xn output by a utility grid to form a voltage sample set that satisfies an N (μ, σ 2) distribution, where μ and standard deviation σ are desired as unknowns;
Calculating the mean value of the voltage sample set And variance S 2, and respectively obtaining confidence intervals of expected mu and standard deviation sigma with confidence level of 1-alpha;
Each time a new voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, the calculation steps are repeated, and a confidence interval of mu and standard deviation sigma is expected when the confidence level of the new voltage sample set is 1-alpha;
Repeating the new voltage sample collection and calculation process to obtain confidence intervals of expected mu and standard deviation sigma of a plurality of continuous voltage sample sets, and taking when the confidence intervals of expected mu and standard deviation sigma of the plurality of continuous voltage sample sets are all stable within a preset fluctuation range Sigma 2＝S2; determining a voltage output interval of the power grid in a normal working state according to the expected mu and the standard deviation sigma;
And the fault prediction module is used for realizing the fault prediction of the power grid according to the voltage output interval in the normal working state.
Optionally, the confidence intervals of the expected μ and standard deviation σ of the consecutive, several voltage sample sets are each stable within a predetermined fluctuation range determined by:
Confidence intervals of the expected mu and standard deviation sigma of the voltage sample sets respectively meet the conditions that the upper boundary value deviates from the upper boundary average value by less than 0.1 and the lower boundary value deviates from the lower boundary average value by less than 0.1.
Optionally, the fault prediction module implements fault prediction by the following method: after determining a voltage output interval in a normal working state of the power grid, clearing the voltage sample set; re-collecting voltage samples, wherein each time a voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, and the average value of the sample sets is calculatedAnd variance S 2; per 100 groups accumulated mean/>After the sample variance S 2, calculate/>, respectivelyAverage value with S 2, the current calculated average valueAnd the variance S 2 is different from the average value respectively, and if any difference value is larger than 0.2, the power grid fault is judged.
Optionally, the storage battery comprises a plurality of storage battery packs, wherein each storage battery pack comprises a battery management unit and a plurality of storage battery monomers, and the battery management unit is used for collecting and uploading electrical information of the storage battery monomers; and the battery management unit is in communication connection with the battery fault monitoring module through a CAN bus.
Optionally, the battery management unit includes current acquisition module, temperature acquisition module, voltage acquisition module, microprocessor and communication module, current acquisition module, temperature acquisition module and voltage acquisition module respectively with microprocessor electric connection, microprocessor and communication module electric connection.
Optionally, the battery management unit further includes an overcurrent fault judging module and a temperature fault judging module, where the overcurrent fault judging module and the temperature fault judging module are respectively electrically connected with the microprocessor.
Optionally, the battery fault monitoring module includes:
The storage module is used for receiving and storing real-time voltage information in the charging and discharging process of the battery pack;
The similarity calculation module is used for calculating the similarity between the voltage information vector and the mean value vector of the storage battery monomers in the storage battery pack;
The consistency fault judging module is used for predicting a fault storage battery pack according to the worst consistency of the storage battery pack with the largest vector of the similarity and other storage battery packs, and judging the storage battery pack with the largest similarity as the fault storage battery pack by combining the storage battery pack with the largest similarity larger than a fault experience threshold;
the standard deviation calculation module is used for calculating the standard deviation of the voltage information of the fault storage battery pack;
and the battery cell fault judging module is used for judging the fault position of the battery cell according to the battery cell corresponding to the vector with the standard deviation as the maximum value point.
Compared with the prior art, the intelligent emergency power supply provided by the invention has the advantages that the output voltage of the commercial power grid is detected through the detection module and sent to the controller, the controller analyzes and obtains the distribution characteristics met by the output voltage data of the commercial power grid based on the output voltage data of the commercial power grid, and the fault prediction is realized according to the distribution characteristics, so that the automatic switching between the emergency power supply and the commercial power is realized, and the emergency power supply is provided when the short-time commercial power is interrupted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram provided in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses an intelligent emergency power supply, which is shown in fig. 1 and comprises the following components: the device comprises a detection module, a charging module, a storage battery, a battery fault monitoring module, a controller, a display module, an inverter, an automatic switching switch, a boosting module and a man-machine interaction module.
The input end of the detection module is connected with external mains supply; the output end of the detection module is respectively connected with the charging module and the controller; the output end of the charging module is connected with the storage battery; the output end of the storage battery is connected with the boosting module through the inverter; the output end of the boosting module is connected with the automatic change-over switch; the output end of the automatic change-over switch is connected with an external load; the mains supply is connected with the input end of the automatic change-over switch; the controller is respectively connected with the charging module, the battery fault monitoring module, the display module, the man-machine interaction module and the automatic change-over switch; the battery fault monitoring module is connected with the storage battery.
The detection module detects the output voltage of the commercial power grid and sends the output voltage to the controller;
The controller receives the mains voltage, judges whether the mains voltage is normal, and simultaneously controls the automatic change-over switch, the on-off of the charging module and the on-off of the display module; receiving monitoring information of a battery fault monitoring module and judging whether the storage battery stores energy normally or not;
a storage battery storing electric energy and discharging the electric energy; the storage battery is used as an energy storage medium of the emergency power supply, is a large-sized energy storage battery, and has the advantages of being capable of storing more electric energy, releasing the electric energy quickly and the like.
The inverter converts direct current into alternating current, and keeps the voltage, frequency and phase of the electric energy output by the storage battery consistent with the height of the power grid;
The charging module inverts and decompresses the commercial power to charge the storage battery; and the charging module is controlled by the controller, and when the controller monitors that the electric quantity of the storage battery is smaller than a set electric quantity threshold value, the charging module is controlled to charge the storage battery.
The automatic change-over switch is used for switching the power supply lines of the commercial power and the external emergency power supply, and the change-over action of the automatic change-over switch is controlled by the controller and mainly comprises two relay switches which are mainly used for controlling the change-over of the lines.
And the display module is used for displaying the value of the voltage of the storage battery terminal and fault information.
The man-machine interaction module is an LED touch display screen, and is used for checking the action of the controller in real time and issuing a control command to the controller.
And the boosting module is communicated with the storage battery to quickly release the electric energy in the storage battery, and buffers and boosts the electric energy.
In a specific embodiment, the boost module includes a battery quick discharge subcircuit, an electrical energy storage subcircuit, and a boost subcircuit; the storage battery quick discharging electronic circuit is used for being connected with the storage battery and quickly releasing electric energy in the storage battery; the electric energy storage sub-circuit is used for buffering electric energy in a short time, and has the functions of inputting small-power current and outputting large-power current, and the boosting sub-circuit is used for boosting voltage.
In a specific embodiment, the controller comprises: the system comprises a voltage receiving module, a voltage processing module and a fault prediction module; wherein,
The voltage receiving module is used for receiving the output voltage of the commercial power grid sent by the detection module;
The voltage processing module is used for obtaining a voltage output interval of the commercial power grid in a normal working state by executing the following operations:
Continuously collecting voltage samples X 1,X2,...,Xn output by a mains supply grid to form a voltage sample set, wherein the voltage sample set meets N (mu, sigma 2) distribution, wherein mu and standard deviation sigma are expected to be unknowns, and the system confidence level is set to be 1-alpha=0.9;
Calculating the mean value of the voltage sample set And variance S 2, and respectively obtaining confidence intervals of expected mu and standard deviation sigma with confidence level of 1-alpha;
Wherein,
Calculating the confidence interval for the expected μ at a confidence level of 1- α will be because the sample variance S 2 is an unbiased estimate of σ 2 Sigma of (a)/>Due to/>Get/>As the pivot quantity, get
The confidence interval for a desired μ confidence level of 1- α is:
Calculating the confidence interval of the standard deviation sigma when the confidence level is 1-alpha:
Due to Get/>As the pivot quantity, then
The confidence interval for a confidence level of 1-a is:
each time a new voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, the calculation steps are repeated, and a confidence interval of which the confidence level is 1-alpha and the expected mu and standard deviation sigma under the new voltage sample set is obtained;
Repeating the new voltage sample collection and calculation process to obtain confidence intervals of expected mu and standard deviation sigma of a plurality of continuous voltage sample sets, and taking when the confidence intervals of expected mu and standard deviation sigma of the plurality of continuous voltage sample sets are all stable within a preset fluctuation range Sigma 2＝S2; determining a voltage output interval of the power grid in a normal working state according to the expected mu and the standard deviation sigma;
and the fault prediction module is used for realizing the fault prediction of the power grid according to the voltage output interval in the normal working state.
In a specific embodiment, the confidence intervals of the expected μ and standard deviation σ for successive, several voltage sample sets are each stable within a predetermined fluctuation range, determined by:
Confidence intervals of the expected mu and standard deviation sigma of the plurality of voltage sample sets respectively meet that the upper boundary value deviates from the upper boundary average value by less than 0.1 and the lower boundary value deviates from the lower boundary average value by less than 0.1.
In a specific embodiment, the fault prediction module implements the fault prediction by: after determining a voltage output interval in a normal working state of the power grid, clearing the voltage sample set; re-collecting voltage samples, wherein each time a voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, and the average value of the sample sets is calculatedAnd variance S 2; per 100 groups accumulated mean/>After the sample variance S 2, calculate/>, respectivelyAverage value with S 2, the current calculated average valueAnd the variance S 2 is different from the average value respectively, and if any difference is greater than 0.2, the power grid fault is judged.
When the controller judges that the power grid fails, the controller controls the automatic change-over switch to be switched to a power supply line of the storage battery so as to supply power for the load.
In a specific embodiment, the storage battery comprises a plurality of storage battery packs, each storage battery pack comprises a battery management unit and a plurality of storage battery monomers, and the battery management unit is used for collecting and uploading electrical information of the storage battery monomers; the battery management unit is in communication connection with the battery fault monitoring module through a CAN bus.
In a specific embodiment, the battery management unit includes a current collection module, a temperature collection module, a voltage collection module, a microprocessor, and a communication module, where the current collection module, the temperature collection module, and the voltage collection module are electrically connected to the microprocessor, and the microprocessor is electrically connected to the communication module.
In a specific embodiment, the battery management unit further includes an overcurrent fault determination module and a temperature fault determination module, where the overcurrent fault determination module and the temperature fault determination module are electrically connected to the microprocessor respectively.
In a specific embodiment, the battery fault monitoring module includes:
The storage module is used for receiving and storing real-time voltage information in the charging and discharging process of the battery pack;
The similarity calculation module is used for calculating the similarity between the voltage information vector and the mean value vector of the storage battery monomers in the storage battery pack;
The consistency fault judging module is used for predicting a fault storage battery pack according to the worst consistency of the storage battery pack with the largest vector of the similarity and other storage battery packs, and judging the storage battery pack with the largest similarity as the fault storage battery pack by combining the storage battery pack with the largest similarity larger than a fault experience threshold;
the standard deviation calculation module is used for calculating the standard deviation of the voltage information of the fault storage battery pack;
and the battery cell fault judging module is used for judging the fault position of the battery cell according to the battery cell corresponding to the vector with the standard deviation as the maximum value point.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. An intelligent emergency power supply, comprising: the device comprises a detection module, a charging module, a storage battery, an automatic change-over switch, a controller and an inverter;
the detection module detects the output voltage of the commercial power grid and sends the output voltage to the controller;
The controller receives the mains voltage, judges whether the mains voltage is normal, and simultaneously controls the automatic change-over switch and the on and off of the charging unit;
A storage battery storing electric energy and discharging the electric energy;
the inverter converts direct current into alternating current, and keeps the voltage, frequency and phase of the electric energy output by the storage battery consistent with the height of the power grid;
The charging module inverts and decompresses the commercial power to charge the storage battery;
The automatic switching module is used for switching power supply lines of the commercial power and an external emergency power supply;
the controller includes: the system comprises a voltage receiving module, a voltage processing module and a fault prediction module; wherein,
The voltage receiving module is used for receiving the output voltage of the commercial power grid sent by the detecting module;
The voltage processing module is used for obtaining a voltage output interval of the commercial power grid in a normal working state by executing the following operations:
Continuously collecting voltage samples X 1,X2,...,Xn of the utility grid output to form a voltage sample set that satisfies the N (μ, σ 2) distribution, where μ and standard deviation σ 2 are expected to be unknowns;
Calculating the mean value of the voltage sample set And variance S 2, and respectively obtaining confidence intervals of expected mu and standard deviation sigma with confidence level of 1-alpha;
Each time a new voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, the calculation steps are repeated, and a confidence interval of mu and standard deviation sigma is expected when the confidence level of the new voltage sample set is 1-alpha;
Repeating the new voltage sample collection and calculation process to obtain confidence intervals of expected mu and standard deviation sigma of a plurality of continuous voltage sample sets, and taking when the confidence intervals of expected mu and standard deviation sigma of the plurality of continuous voltage sample sets are all stable within a preset fluctuation range Sigma 2＝S2; determining a voltage output interval of the power grid in a normal working state according to the expected mu and the standard deviation sigma;
the fault prediction module is used for realizing the fault prediction of the power grid according to the voltage output interval in the normal working state;
The fault prediction module is used for realizing fault prediction by the following method: after determining a voltage output interval in a normal working state of the power grid, clearing the voltage sample set; re-collecting voltage samples, wherein each time a voltage sample is collected, a new voltage sample set is formed together with the voltage sample set at the previous moment, and the average value of the sample sets is calculated And variance S 2; per 100 groups accumulated mean/>After the sample variance S 2, calculate/>, respectivelyAverage value with S 2, the currently calculated average value/>The variance S 2 is different from the average value respectively, and if any difference value is larger than 0.2, the power grid fault is judged;
The storage battery comprises a plurality of storage battery packs, wherein each storage battery pack comprises a battery management unit and a plurality of storage battery monomers, and the battery management unit is used for collecting and uploading electrical information of the storage battery monomers; the battery management unit is in communication connection with the battery fault monitoring module through a CAN bus;
The battery fault monitoring module includes:
The storage module is used for receiving and storing real-time voltage information in the charging and discharging process of the battery pack;
The similarity calculation module is used for calculating the similarity between the voltage information vector and the mean value vector of the storage battery monomers in the storage battery pack;
The consistency fault judging module is used for predicting a fault storage battery pack according to the worst consistency of the storage battery pack with the largest vector of the similarity and other storage battery packs, and judging the storage battery pack with the largest similarity as the fault storage battery pack by combining the storage battery pack with the largest similarity larger than a fault experience threshold;
the standard deviation calculation module is used for calculating the standard deviation of the voltage information of the fault storage battery pack;
and the battery cell fault judging module is used for judging the fault position of the battery cell according to the battery cell corresponding to the vector with the standard deviation as the maximum value point.
2. The intelligent emergency power supply of claim 1, wherein the confidence intervals of the expected μ and standard deviation σ of the consecutive, several voltage sample sets are each stable within a predetermined fluctuation range is determined by:
Confidence intervals of the expected mu and standard deviation sigma of the voltage sample sets respectively meet the conditions that the upper boundary value deviates from the upper boundary average value by less than 0.1 and the lower boundary value deviates from the lower boundary average value by less than 0.1.
3. The intelligent emergency power supply of claim 1, wherein the battery management unit comprises a current collection module, a temperature collection module, a voltage collection module, a microprocessor and a communication module, wherein the current collection module, the temperature collection module and the voltage collection module are respectively and electrically connected with the microprocessor, and the microprocessor is electrically connected with the communication module.
4. The intelligent emergency power supply according to claim 3, wherein the battery management unit further comprises an overcurrent fault determination module and a temperature fault determination module, and the overcurrent fault determination module and the temperature fault determination module are respectively electrically connected with the microprocessor.
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| CN107124033A (en) * | 2017-05-22 | 2017-09-01 | 合肥联信电源有限公司 | A kind of emergency power system for exporting switching free of discontinuities |
| CN110869786A (en) * | 2017-07-10 | 2020-03-06 | Abb瑞士股份有限公司 | Ground fault detection for UPS battery packs |
| CN111917171A (en) * | 2020-07-15 | 2020-11-10 | 宁波荣特电子有限公司 | High altitude lamp emergency power supply system |
| CN116154948A (en) * | 2023-04-17 | 2023-05-23 | 安徽凯民电力技术有限公司 | Anti-interference electricity fast switching system of medium-voltage system |
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