CN114421558A - Intelligent power supply management method - Google Patents

Intelligent power supply management method Download PDF

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Publication number
CN114421558A
CN114421558A CN202111654575.1A CN202111654575A CN114421558A CN 114421558 A CN114421558 A CN 114421558A CN 202111654575 A CN202111654575 A CN 202111654575A CN 114421558 A CN114421558 A CN 114421558A
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load
battery pack
storage battery
voltage
center unit
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CN114421558B (en
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连鹏
陈自帅
崔梦涛
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Jinmingzhengyuan Beijing Technology Co ltd
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Jinmingzhengyuan Beijing Technology Co ltd
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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
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a power management method, which is operated in a power management system to manage energy of a storage battery, and the method calculates the capacity of the storage battery in real time by combining the real-time monitoring of the voltage and the discharge time of the storage battery, gradually closes non-core equipment so as to ensure the long-time operation of the core equipment, simultaneously records the voltage and the power of the storage battery in real time through an energy management system, and can sequentially close all load equipment when the voltage set by the storage battery is reached, thereby preventing the over-discharge of the storage battery and prolonging the service life of the storage battery.

Description

Intelligent power supply management method
Technical Field
The invention belongs to the technical field of energy source grading regulation and control, and relates to an intelligent power supply management method.
Background
More and more places such as microcomputer rooms, base stations, frontier sentries, field stations and the like cannot use two-way or multi-way power supply input to supply power to equipment due to factors such as geographical positions, environments, budget limits and the like; the mode of single-path power supply input and storage battery matching is adopted to provide power for the equipment, and the operation of load equipment is guaranteed.
When the utility power is interrupted, the battery supplies power to the load. Due to cost, the battery capacity configured on site can only maintain a load operation for several hours. However, the mains supply cannot be recovered in time due to the damage of the cable and the like; the front-end station is far away, so that the standby battery cannot be replaced in time; the load is often caused to consume the electric quantity in the battery, so that the battery is over-discharged, and irreversible damage is caused to the battery. Meanwhile, the prolonged power supply of the most core devices of the user cannot be guaranteed.
The current market uses: the time grading method is characterized in that a plurality of different discharging time nodes are arranged according to the load and the battery capacity, and the load is cut off to protect the storage battery. However, when the storage battery discharges with a large current, the discharge capacity is also relatively fast due to relatively fast voltage drop, and at this time, although the capacity of the storage battery is already discharged, the time is not reached, so that the deep discharge of the storage battery can be caused, the service life of the storage battery is influenced, and even the storage battery is damaged. The capacity grading method is to divide the battery capacity percentage of several stages according to the capacity of the storage battery, cut off the load according to the capacity percentage and protect the storage battery and the equipment power supply. However, the method is easily affected by environmental factors, the temperature difference between seasons and day and night is large, the capacity of the storage battery is changed rapidly, the capacity of the storage battery is increased when the temperature is high, the capacity of the storage battery is reduced when the temperature is low, the capacity of the storage battery is not constant, and the load is cut off according to the preset percentage when the temperature is low and the capacity of the storage battery is low, so that the load is quickly powered off, the storage battery is over-discharged, and the service life of the storage battery is affected. The defects caused by taking the capacity and the time as the basis for judging the electric quantity of the battery are effectively eliminated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention discloses a power management method which is used for calculating the capacity of a storage battery in real time in a mode of combining the voltage of the storage battery with the discharge time in real time, ensuring the long-time operation of core equipment in a mode of closing a non-core load, preventing the over-discharge of the storage battery and prolonging the service life of the storage battery.
The invention discloses a power supply management method, which is operated in a power supply management system to manage the energy of a storage battery pack, wherein the power supply management system comprises a switching power supply device, the storage battery pack, a core load, an important load, an auxiliary load and an analysis center unit, the analysis center unit comprises an acquisition host unit and a monitoring center unit, the acquisition host unit is in communication connection with the monitoring center unit, and the method comprises the following steps:
s100, setting core load operation duration H0Setting the battery pack voltage V for auxiliary load shutdownBSetting battery pack voltage V for important load closingCRecording the nominal voltage V of the battery packD；
S200, when the mains supply is judged to be powered off, the analysis center unit performs power-off operation, meanwhile, the storage battery enters a discharging stage, the discharging stage of the storage battery is divided into three stages, the core load, the important load and the auxiliary load are kept electrified to work in the first stage, the core load and the important load are kept electrified to work in the second stage, the auxiliary load is turned off, the core load is kept electrified to work in the third stage, and the important load and the auxiliary load are turned off; when the mains supply is powered off, whether the acquisition host unit and the monitoring center unit in the analysis center unit are in communication connection or not is judged at the same time;
s300, when the communication is kept in a normal state, the monitoring center unit regularly calculates the running time of the storage battery pack for keeping the first stage, and judges whether to close the auxiliary load according to the running time of the storage battery pack for keeping the first stage;
s400, after the auxiliary load is closed, the monitoring center unit regularly calculates the operation time of the storage battery pack for keeping the second stage, and judges whether to close the important load according to the operation time of the storage battery pack for keeping the second stage;
s500, after the important load is closed, the system keeps the third stage to continue to operate until the electric quantity of the storage battery is exhausted;
and S600, when the commercial power is judged to be restored to normal work, the analysis center unit carries out power-on operation and sequentially starts the important load and the auxiliary load.
Furthermore, the specific method for calculating the first-stage operating time of the battery pack in S300 includes:
when the commercial power is cut off and the communication is kept in a normal state, the monitoring center unit records the initial voltage Va of the first stage of the storage battery pack0And toShould be initiated at time point Ta0And keeping a certain time interval to regularly and continuously record the voltage Va of the storage battery packiAnd corresponding time point TaiWherein i is the recording times of the voltage of the storage battery pack, and i is 1, 2,. and n;
when the commercial power is judged to be cut off, the initial voltage Va of the storage battery pack is used0And corresponding to the initial time point Ta0At the beginning, the monitoring center unit calculates the adjacent time points Tai-1、TaiRunning time Ha of accumulator battery for using up all electric quantityiThe specific calculation method comprises the following steps:
Figure BDA0003447921070000021
wherein i ═ 1, 2, · n, VDIs the nominal voltage of the battery pack.
Further, in S300, the specific method for determining whether to turn off the auxiliary load according to the first-stage operating time of the battery pack includes:
obtaining TaiRuntime Ha at which the battery pack exhausts all of its power at a time pointiAnd determines Ta at the current time pointiRunning time Ha of accumulator battery for using up all electric quantityiWhether or not greater than core load operation duration H0If the operation time Ha is judgediGreater than core load operation duration H0If the storage battery pack is in the second phase, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the running time Xa of the storage battery pack keeping the second phasei；
Run time Xa when simulating the calculationiGreater than H0When the auxiliary load is electrified, the auxiliary load is kept to work continuously; run time Xa when simulating the calculationiIs equal to or less than H0When so, the auxiliary load is turned off.
Further, the monitoring center unit simulates and calculates the running time Xa of the storage battery pack maintaining the second stageiThe specific method comprises the following steps:
calculating the residual electric quantity Wa in the first stage in the storage battery packi＝Hai×(PCore+PHeavy load+PAuxiliary device)；
Monitoring center unit simulation calculation storage battery residual electric quantity WaiIn the second phase the running time Xai：
Xai＝Wai/(PCore+PHeavy load)，
Wherein P isCoreIs the rated power of the core load, PHeavy loadRated power, P, for important loadsAuxiliary deviceIs the rated power of the auxiliary load.
Further, the specific method for maintaining the second-stage operating time of the storage battery pack in S400 is as follows:
when the auxiliary load is turned off, the monitoring center unit records the initial voltage Vb of the second stage of the battery pack0And corresponding initial point in time Tb0(ii) a And keeping a certain time interval to regularly and continuously record the voltage Vb of the storage battery packiAnd corresponding time point TbiAnd i is the recording times of the voltage of the storage battery pack after the auxiliary load is closed, and i is 1, 2.
At the initial voltage Vb of the battery pack0And corresponding initial point in time Tb0Starting, sequentially calculating adjacent time points Tbi-1、TbiRunning time Hb of middle storage battery pack for exhausting all electric quantityiThe specific calculation method comprises the following steps:
Figure BDA0003447921070000031
wherein i ═ 1, 2, · n, VDNominal voltage for the battery.
Further, in S400, the specific method for determining whether to turn off the important load according to the second-stage operating time of the battery pack includes:
obtaining TbiRunning time Hb of battery pack exhausting all electricity at time pointiAnd determines that Tb is at the current time pointiRunning time Hb of battery pack exhausting all electricityiWhether or not it is greater than the remaining operating duration H of the core load00Which isMiddle H00＝H0-(Tbi-Ta0),Ta0For the initial time point of the battery pack in the first stage, if the operation time Hb is determinediGreater than core load operation duration H00If the storage battery pack is not in the first phase, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the running time Xb of the storage battery pack keeping the second phasei；
Run time Xb when simulating a calculationiGreater than H00When the load is in use, the important load is kept to be electrified for working; run time Xb when simulating a calculationiIs equal to or less than H00While, the critical load is shut down.
Further, the monitoring center unit simulates and calculates the running time Xb of the storage battery pack in the third stageiThe specific method comprises the following steps:
calculating the remaining power Wb in the second stage of the interior of the storage battery packi＝Hbi×(PCore+PHeavy load)；
The monitoring center unit simulates and calculates the residual electric quantity Wb of the storage battery packiRun time Xb in the third phasei：
Xbi＝Wbi/PCore，
Wherein P core is the rated power of the core load, PHeavy loadIs the rated power of the important load.
Further, in S200, when it is determined that the communication connection between the collection host unit and the monitoring center unit in the analysis center unit is disconnected, the collection host unit sets the voltage V of the storage battery pack with the auxiliary load turned offBSetting battery pack voltage V for important load closingCFor the purpose, the following electric operations are carried out:
pack voltage V when pack voltage drops to auxiliary load shutdownBWhen the auxiliary load is closed, the collection host unit closes the auxiliary load; pack voltage V when pack voltage drops to critical load shutdownCWhen the load is in the normal state, the collection host unit closes the important load;
collecting storage battery voltage V of auxiliary load closing in host unitBAnd storage of important load shutdownsVoltage V of battery packCAnd continuously keeping updating the voltage value of the storage battery pack according to the closing of the auxiliary load and the important load when the collection host unit and the monitoring center unit are in communication connection last time.
Further, a specific method for the analysis center unit to perform the power-on operation in S600 is as follows:
the switch power supply module is provided with a rated working voltage and a lowest working voltage, when the mains voltage is greater than the rated working voltage of the switch power supply module, the switch power supply module normally works, meanwhile, the acquisition host unit does not acquire data, and the monitoring center unit sequentially starts important equipment and auxiliary equipment; when the mains voltage is less than the rated working voltage of the switch power supply module and greater than the lowest working voltage, the acquisition host unit acquires the output power P of the switch power supply moduleOpening deviceCore load power PCoreCharging power P of storage battery packStorage tankThe monitoring center unit carries out analysis and calculation if P isOpening device>PStorage tank+PCoreThen the important load is started and the power P after the important load is started is recordedHeavy loadWhile continuing to analyze and calculate if POpening device>PStorage tank+PCore+PHeavy loadIf yes, the auxiliary load is started; when the mains voltage is less than or equal to the lowest working voltage of the switching power supply module, the switching power supply module does not work.
Compared with the prior art, the invention has the following advantages:
1) the capacity of the storage battery is calculated in real time mainly in a mode of combining the voltage of the storage battery with the discharge time in real time, non-core equipment is closed step by step, long-time operation of the core equipment is further guaranteed, meanwhile, the voltage and the power of the storage battery can be recorded in real time through an energy management system, and when the set voltage of the storage battery is reached, all load equipment can be closed in sequence, so that the over-discharge of the storage battery is prevented, and the service life of the storage battery is prolonged.
Drawings
FIG. 1 is a flowchart illustrating a power-down operation of a power management method according to an embodiment;
fig. 2 is a flowchart of a power-up operation in a power management method in this embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example (b):
the embodiment discloses a power management method, which is operated in a power management system to manage energy of a storage battery, and the power management system comprises a switching power supply device, the storage battery, a core load, an important load, an auxiliary load and an analysis center unit, wherein the analysis center unit comprises a collection host unit and a monitoring center unit, the collection host unit and the monitoring center unit are in communication connection, the collection host unit and the monitoring center unit both record collected data and respectively operate and process the data in the power management system, as shown in fig. 1, the method comprises the following steps:
s100, firstly setting core load operation duration H in a power management system0Setting the battery pack voltage V for auxiliary load shutdownBSetting battery pack voltage V for important load closingCRecording the nominal voltage V of the battery packD；
S200, when the mains supply is judged to be powered off, the analysis center unit performs power-off operation, meanwhile, the storage battery enters a discharging stage, the discharging stage of the storage battery is divided into three stages, the core load, the important load and the auxiliary load are kept electrified to work in the first stage, the core load and the important load are kept electrified to work in the second stage, the auxiliary load is turned off, the core load is kept electrified to work in the third stage, and the important load and the auxiliary load are turned off; when the mains supply is powered off, whether the acquisition host unit and the monitoring center unit in the analysis center unit are in communication connection or not is judged at the same time; in general, when the collection host unit and the monitoring center unit are in communication connection, the collection host unit and the monitoring center unit both record data information, and the power-on and power-off processes are generally controlled by the monitoring center unit, but in order to prevent the communication connection of the collection host unit and the monitoring center unit from being disconnected when the power is off or the communication is not smooth, the collection host unit can also execute the power-on and power-off process control, and the control data of the collection host unit and the monitoring center unit are generally executed according to the latest data in the auxiliary load power-off storage battery pack voltage data and the important load power-off storage battery pack voltage data when the collection host unit and the monitoring center unit are connected.
When the communication connection between the collection host unit and the monitoring center unit is disconnected, the collection host unit sets the voltage V of the storage battery pack with the auxiliary load closedBSetting battery pack voltage V for important load closingCFor the purpose, the following electric operations are carried out:
pack voltage V when pack voltage drops to auxiliary load shutdownBWhen the auxiliary load is closed, the collection host unit closes the auxiliary load; pack voltage V when pack voltage drops to critical load shutdownCWhen the load is in the normal state, the collection host unit closes the important load;
it should be noted that the battery pack voltage V at which the auxiliary load is turned off in the host unit is collectedBAnd battery pack voltage V with critical load shut-offCAnd continuously keeping updating according to the voltage values of the storage battery pack when the collection host unit and the monitoring center unit are in communication connection in the last analysis center unit, wherein the auxiliary load and the important load are closed. The storage battery pack voltage value of the auxiliary load and the important load are updated in real time, so that stable power supply in the power-down operation of the storage battery pack can be kept, the over-discharge of the storage battery is avoided, and the service life of the storage battery is aggravated to be reduced.
And S300, when the communication is kept in a normal state, the monitoring center unit regularly calculates the running time of the storage battery pack for keeping the first stage, and judges whether to close the auxiliary load according to the running time of the storage battery pack for keeping the first stage.
Specifically, the specific method for calculating the first-stage running time of the storage battery pack by the monitoring center unit comprises the following steps:
s310, when the mains supply is judged to be powered off and the communication is kept in a normal state, the monitoring center unit records the initial voltage Va of the first stage of the storage battery pack0And corresponding to the initial time point Ta0And keeping a certain time interval to regularly and continuously record the voltage Va of the storage battery packiAnd corresponding time point TaiWherein i is the recording times of the voltage of the storage battery pack, and i is 1, 2,. and n;
s320, when the commercial power is judged to be cut off, the initial voltage Va of the storage battery pack is used0And corresponding to the initial time point Ta0At the beginning, the monitoring center unit calculates the adjacent time points Tai-1、TaiStorage batteryRun time Ha at which the group runs out of full chargeiThe specific calculation method comprises the following steps:
Figure BDA0003447921070000061
wherein i ═ 1, 2, · n, VDIs the nominal voltage of the battery pack.
In addition, the specific method for judging whether to turn off the auxiliary load by the monitoring center unit according to the first-stage running time of the storage battery pack is as follows:
s330, obtaining TaiRuntime Ha at which the battery pack exhausts all of its power at a time pointiAnd determines Ta at the current time pointiRunning time Ha of accumulator battery for using up all electric quantityiWhether or not greater than core load operation duration H0If the operation time Ha is judgediGreater than core load operation duration H0If the storage battery pack is in the second phase, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the running time Xa of the storage battery pack keeping the second phasei。
In detail, the monitoring center unit simulates and calculates the running time Xa of the storage battery pack maintaining the second stageiThe specific method comprises the following steps:
s331, calculating the residual electric quantity Wa in the first stage of the interior of the storage battery packi＝Hai×(PCore+PHeavy load+PAuxiliary device)；
S332, simulating and calculating residual electric quantity Wa of storage battery pack by using monitoring center unitiIn the second phase the running time Xai：
Xai＝Wai/(PCore+PHeavy load)，
Wherein P isCoreIs the rated power of the core load, PHeavy loadRated power, P, for important loadsAuxiliary deviceIs the rated power of the auxiliary load.
S340. operating time Xa of simulation calculationiGreater than H0When the auxiliary load is electrified, the auxiliary load is kept to work continuously; run time Xa when simulating the calculationiIs equal to or less thanIn H0When so, the auxiliary load is turned off.
S400, after the auxiliary load is closed, the monitoring center unit regularly calculates the operation time of the storage battery pack for keeping the second stage, and judges whether to close the important load according to the operation time of the storage battery pack for keeping the second stage;
specifically, the specific method for calculating the second-stage operating time of the storage battery pack by the monitoring center unit comprises the following steps:
s410, when the auxiliary load is closed, the monitoring center unit records the initial voltage Vb of the second stage of the storage battery pack0And corresponding initial point in time Tb0(ii) a And keeping a certain time interval to regularly and continuously record the voltage Vb of the storage battery packiAnd corresponding time point TbiAnd i is the recording times of the voltage of the storage battery pack after the auxiliary load is closed, and i is 1, 2.
S420, using initial voltage Vb of the storage battery pack0And corresponding initial point in time Tb0Starting, sequentially calculating adjacent time points Tbi-1、TbiRunning time Hb of middle storage battery pack for exhausting all electric quantityiThe specific calculation method comprises the following steps:
Figure BDA0003447921070000071
wherein i ═ 1, 2, · n, VDNominal voltage for the battery.
More specifically, the specific method for the monitoring center unit to determine whether to turn off the important load according to the second-stage operation time of the storage battery pack is as follows:
430. obtaining TbiRunning time Hb of battery pack exhausting all electricity at time pointiAnd determines that Tb is at the current time pointiRunning time Hb of battery pack exhausting all electricityiWhether or not it is greater than the remaining operating duration H of the core load00In which H is00＝H0-(Tbi-Ta0),Ta0For the initial time point of the battery pack in the first stage, if the operation time Hb is determinediGreater than core loadDuration of operation H00If the storage battery pack is not in the first phase, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the running time Xb of the storage battery pack keeping the second phasei(ii) a Wherein the monitoring center unit simulates and calculates the running time Xb of the storage battery pack maintaining the third stageiThe specific method comprises the following steps:
s431, calculating the residual electric quantity Wb in the second stage in the storage battery packi＝Hbi×(PCore+PHeavy load)；
S432, the monitoring center unit simulates and calculates the residual electric quantity Wb of the storage battery packiRun time Xb in the third phasei：
Xbi＝Wbi/PCore，
Wherein P isCoreIs the rated power of the core load, PHeavy loadIs the rated power of the important load.
S440, when simulating the running time Xb of calculationiGreater than H00When the load is in use, the important load is kept to be electrified for working; run time Xb when simulating a calculationiIs equal to or less than H00While, the critical load is shut down.
S500, after the important load is closed, the system keeps the third stage to continue to operate until the electric quantity of the storage battery is exhausted;
and S600, when the commercial power is judged to be restored to normal work, the analysis center unit carries out power-on operation and sequentially starts the important load and the auxiliary load.
Further, as shown in fig. 2, a specific method for the analysis center unit to perform the power-on operation in S600 includes:
the switch power supply module is provided with a rated working voltage and a lowest working voltage, when the mains voltage is greater than the rated working voltage of the switch power supply module, the switch power supply module normally works, meanwhile, the acquisition host unit does not acquire data, and the monitoring center unit sequentially starts important equipment and auxiliary equipment; when the mains voltage is less than the rated working voltage of the switch power supply module and greater than the lowest working voltage, the acquisition host unit acquires the output power P of the switch power supply moduleOpening deviceCore loadPower P ofCoreCharging power P of storage battery packStorage tankThe monitoring center unit carries out analysis and calculation if P isOpening device>PStorage tank+PCoreThen the important load is started and the power P after the important load is started is recordedHeavy loadWhile continuing to analyze and calculate if POpening device>PStorage tank+PCore+PHeavy loadIf yes, the auxiliary load is started; when the mains voltage is less than or equal to the lowest working voltage of the switching power supply module, the switching power supply module does not work.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. An intelligent power management method is operated in a power management system to manage the energy of a storage battery pack, the power management system comprises a switching power supply device, the storage battery pack, a core load, an important load, an auxiliary load and an analysis center unit, wherein the analysis center unit comprises a collection host unit and a monitoring center unit, and the collection host unit is in communication connection with the monitoring center unit, and the intelligent power management method is characterized by comprising the following steps:
s100, setting core load operation duration H0Setting the battery pack voltage V for auxiliary load shutdownBSetting battery pack voltage V for important load closingCRecording the nominal voltage V of the battery packD；
S200, when the mains supply is judged to be powered off, the analysis center unit performs power-off operation, meanwhile, the storage battery enters a discharging stage, the discharging stage of the storage battery is divided into three stages, the core load, the important load and the auxiliary load are kept electrified to work in the first stage, the core load and the important load are kept electrified to work in the second stage, the auxiliary load is turned off, the core load is kept electrified to work in the third stage, and the important load and the auxiliary load are turned off; when the mains supply is powered off, whether the acquisition host unit and the monitoring center unit in the analysis center unit are in communication connection or not is judged at the same time;
s300, when the communication is kept in a normal state, the monitoring center unit regularly calculates the running time of the storage battery pack for keeping the first stage, and judges whether to close the auxiliary load according to the running time of the storage battery pack for keeping the first stage;
s400, after the auxiliary load is closed, the monitoring center unit regularly calculates the operation time of the storage battery pack for keeping the second stage, and judges whether to close the important load according to the operation time of the storage battery pack for keeping the second stage;
s500, after the important load is closed, the system keeps the third stage to continue to operate until the electric quantity of the storage battery is exhausted;
and S600, when the commercial power is judged to be restored to normal work, the analysis center unit carries out power-on operation and sequentially starts the important load and the auxiliary load.
2. The intelligent power management method according to claim 1, wherein the specific method for calculating the first-stage operation time of the storage battery pack in S300 is as follows:
when the commercial power is cut off and the communication is kept in a normal state, the monitoring center unit records the initial voltage Va of the first stage of the storage battery pack0And corresponding to the initial time point Ta0And keeping a certain time interval to regularly and continuously record the voltage Va of the storage battery packiAnd corresponding time point TaiWherein i is the recording times of the voltage of the storage battery pack, and i is 1, 2,. and n;
when the commercial power is judged to be cut off, the initial voltage Va of the storage battery pack is used0And corresponding to the initial time point Ta0At the beginning, the monitoring center unit calculates the adjacent time points Tai-1、TaiRunning time Ha of accumulator battery for using up all electric quantityiThe specific calculation method comprises the following steps:
Figure FDA0003447921060000011
wherein i ═ 1, 2, · n, VDIs the nominal voltage of the battery pack.
3. The intelligent power management method according to claim 2, wherein the specific method for determining whether to turn off the auxiliary load according to the first-stage operation time of the storage battery pack in S300 is as follows:
obtaining TaiRuntime Ha at which the battery pack exhausts all of its power at a time pointiAnd determines Ta at the current time pointiRunning time Ha of accumulator battery for using up all electric quantityiWhether or not greater than core load operation duration H0If the operation time Ha is judgediGreater than core load operation duration H0If the storage battery pack is in the second phase, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the running time Xa of the storage battery pack keeping the second phasei；
Run time Xa when simulating the calculationiGreater than H0When the auxiliary load is electrified, the auxiliary load is kept to work continuously; run time Xa when simulating the calculationiIs equal to or less than H0When so, the auxiliary load is turned off.
4. The intelligent power management method as claimed in claim 3, wherein the monitoring center unit simulates the operation time Xa of the storage battery pack maintaining the second stageiThe specific method comprises the following steps:
calculating the residual electric quantity Wa in the first stage in the storage battery packi＝Hai×(PCore+PHeavy load+PAuxiliary device)；
Monitoring center unit simulation calculation storage battery residual electric quantity WaiIn the second phase the running time Xai：
Xai＝Wai/(PCore+PHeavy load)，
Wherein P isCoreIs the rated power of the core load, PHeavy loadRated power, P, for important loadsAuxiliary deviceIs the rated power of the auxiliary load.
5. The intelligent power management method according to claim 1, wherein the specific method for maintaining the second-stage operation time of the storage battery pack in S400 is as follows:
when the auxiliary load is turned off, the monitoring center unit records the initial voltage Vb of the second stage of the battery pack0And corresponding initial point in time Tb0(ii) a And keeping a certain time interval to regularly and continuously record the voltage Vb of the storage battery packiAnd corresponding time point TbiWherein i is the recording times of the voltage of the storage battery pack after the auxiliary load is closed, and i is 1, 2,. and n;
at the initial voltage Vb of the battery pack0And corresponding initial point in time Tb0Starting, sequentially calculating adjacent time points Tbi-1、TbiRunning time Hb of middle storage battery pack for exhausting all electric quantityiThe specific calculation method comprises the following steps:
Figure FDA0003447921060000021
wherein i ═ 1, 2, · n, VDNominal voltage for the battery.
6. The intelligent power management method according to claim 5, wherein the specific method for determining whether to turn off the important load according to the second-stage operation time of the storage battery pack in S400 is as follows:
obtaining TbiRunning time Hb of battery pack exhausting all electricity at time pointiAnd determines that Tb is at the current time pointiRunning time Hb of battery pack exhausting all electricityiWhether or not it is greater than the remaining operating duration H of the core load00In which H is00＝H0-(Tbi-Ta0),Ta0For the initial time point of the battery pack in the first stage, if the operation time Hb is determinediGreater than core load operation duration H00If the storage battery pack is not in the second order, the monitoring center unit does not perform any processing, otherwise, the monitoring center unit simulates and calculates the storage battery pack to keep the second orderRun time Xb of a segmenti；
Run time Xb when simulating a calculationiGreater than H00When the load is in use, the important load is kept to be electrified for working; run time Xb when simulating a calculationiIs equal to or less than H00While, the critical load is shut down.
7. The intelligent power management method according to claim 6, wherein the monitoring center unit simulates and calculates the running time Xb of the storage battery pack for maintaining the third stageiThe specific method comprises the following steps:
calculating the remaining power Wb in the second stage of the interior of the storage battery packi＝Hbi×(PCore+PHeavy load)；
The monitoring center unit simulates and calculates the residual electric quantity Wb of the storage battery packiRun time Xb in the third phasei：
Xbi＝Wbi/PCore，
Wherein P core is the rated power of the core load, PHeavy loadIs the rated power of the important load.
8. The intelligent power management method according to claim 6, wherein in S200, when it is determined that the collection host unit and the monitoring center unit in the analysis center unit are disconnected from communication, the collection host unit sets the voltage V of the storage battery pack with the auxiliary load turned offBSetting battery pack voltage V for important load closingCFor the purpose, the following electric operations are carried out:
pack voltage V when pack voltage drops to auxiliary load shutdownBWhen the auxiliary load is closed, the collection host unit closes the auxiliary load; pack voltage V when pack voltage drops to critical load shutdownCWhen the load is in the normal state, the collection host unit closes the important load;
collecting storage battery voltage V of auxiliary load closing in host unitBAnd battery pack voltage V with critical load shut-offCWill collect the auxiliary load and important burden when the host computer unit and the monitoring center unit are connected according to the last timeThe pack voltage values at load shutdown are constantly kept updated.
9. The intelligent power management method according to claim 1, wherein the specific method for the analysis center unit to perform the power-on operation in S600 is as follows:
the switch power supply module is provided with a rated working voltage and a lowest working voltage, when the mains voltage is greater than the rated working voltage of the switch power supply module, the switch power supply module normally works, meanwhile, the acquisition host unit does not acquire data, and the monitoring center unit sequentially starts important equipment and auxiliary equipment; when the mains voltage is less than the rated working voltage of the switch power supply module and greater than the lowest working voltage, the acquisition host unit acquires the output power P of the switch power supply moduleOpening deviceCore load power PCoreCharging power P of storage battery packStorage tankThe monitoring center unit carries out analysis and calculation if P isOpening device>PStorage tank+PCoreThen the monitoring center unit starts the important load and records the power P after the important load is startedHeavy loadWhile continuing to analyze and calculate if POpening device>PStorage tank+PCore+PHeavy loadIf yes, the auxiliary load is started; when the mains voltage is less than or equal to the lowest working voltage of the switching power supply module, the switching power supply module does not work.
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