CN105676131A - Vanadium cell dynamic state of charge (SOC<d>)estimation method based on charging/discharging energy efficiency - Google Patents
Vanadium cell dynamic state of charge (SOC<d>)estimation method based on charging/discharging energy efficiency Download PDFInfo
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- CN105676131A CN105676131A CN201511029410.XA CN201511029410A CN105676131A CN 105676131 A CN105676131 A CN 105676131A CN 201511029410 A CN201511029410 A CN 201511029410A CN 105676131 A CN105676131 A CN 105676131A
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 34
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007599 discharging Methods 0.000 title claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 21
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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Abstract
A vanadium cell SOC<d> estimation method based on charging/discharging energy efficiency is characterized in that the cell working is divided into a charging process and a discharging process, and correspondingly, the cell energy is divided into the charging-side energy and the discharging-side energy; the charging-side energy is mapped into the discharging-side energy by the charging/discharging efficiency of a cell under different currents to obtain the static state of charge(SOC<s>) of the cell; the SOC<d> of the cell are estimated under the loads by taking the reference load discharging capacity as the reference energy and according to the SOC<s> and the discharging capacities of the cell under different loads. The method comprises the concrete steps of (1) adopting different currents to charge the cell respectively to obtain the efficiencies of the cell under different currents to thereby obtain the SOC<s> of the cell; (2) adopting different loads to discharge the cell to obtain the function relationships of different load releasable energy relative to a reference load to thereby obtain the SOC<d> of the cell.
Description
Technical field
The present invention relates to a kind of all-vanadium flow battery SOC (battery charge state) evaluation method, be mainly used in direct-current grid, battery charged side energy be mapped to discharge side by relationship between efficiency and obtain battery static state SOCs, using baseline load discharge capacity as reference energy, according to static SOCsWith the dynamic SOC under this load of the discharge capacity estimation battery of battery under different loadsd。
Background technology
Energy and environment are two hang-ups of world today's facing, and this two hang-up of solution that appears as of micro-capacitance sensor provides new thinking. The low capacity electric power system that micro-capacitance sensor is made up of Distributed-generation equipment, energy storage device, load and relevant control, protection equipment etc. As the important component part of micro-capacitance sensor, energy storage device, for stabilizing power and the energy hunting of micro-grid system, improves stability and the schedulability of system, improves the aspects such as the quality of power supply and play an important role. All-vanadium flow battery with its with environmental friendliness, have extended cycle life, safe and reliable, the advantages such as extensive energy storage can be realized, obtain increasing application.
SOC estimation is one of core content of battery management system research, and the power directly affecting battery controls and energy management. The problem that the research of SOC is required to two aspects of reflection: 1. determine that can battery work on, i.e. static charge electricity condition SOCsResearch; 2. reflection battery maintains the time of current operating state, i.e. dynamic state-of-charge SOCdResearch.
All-vanadium flow battery is applied in micro-capacitance sensor, mainly stabilize power and the energy hunting of system, the stability of raising system and schedulability, absorb unnecessary energy and power at system capacity, power time unnecessary, fill up energy and the power shortage of system when system capacity, power disappearance. Therefore, energy storage device is always at charge or discharge state, and its research can also be divided into charging and discharging two parts. Research for discharge portion at present adopts constant-current discharge more; And many employings constant current constant voltage pattern when charging, adopt constant current mode to be charged to certain voltage, then adopt constant current mode to be charged, until electric current drops to certain value. In direct-current grid, time battery operated, operating mode is more complicated, during charging, electric current is moment change, and when discharging, need to connect DC/DC more, and the factor such as the SOH of charge-discharge magnification, temperature, cycle-index, battery also can affect the precision of SOC estimation, the operating condition that the method that therefore present invention proposes is more suitable in micro-capacitance sensor battery.
Summary of the invention:
It is an object of the invention to, according to vanadium cell application conditions in direct-current grid, it is proposed that the method for a kind of applicable all-vanadium flow battery SOC estimation.
The technical scheme is that the dynamic SOC of the vanadium cell based on charge-discharge energy efficiencydEvaluation method, is divided into charging process and discharge process by battery operated, and the energy content of battery is divided into charged side energy and discharge side energy accordingly; By the efficiency for charge-discharge of battery under different electric currents, charged side energy is mapped as discharge side energy, it is thus achieved that battery static state SOCs; Using baseline load discharge capacity as reference energy, according to static SOCsWith the dynamic SOC under this load of the discharge capacity estimation battery of battery under different loadsd, concretely comprise the following steps:
(1) adopt different electric current respectively battery to be charged, it is thus achieved that the efficiency of battery under different electric currents, and then obtain battery static state SOCs;
1) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty; Stand 10 minutes, then carry out 1C electric discharge with reference load, until it reaches stop electric discharge during electric discharge cut-off condition, obtain battery charge reference energy WcnWith electric discharge reference energy Wdn。
2) stand 10 minutes, then it is charged with different electric current 0.1-1C 5-8 charging current (such as 30A, 40A, 50A, 60A, 70A, 80A) altogether respectively, when voltage reaches the moment stopping charging that upper limit current starts to reduce, obtain the rechargeable energy W under battery difference electric currentc; Stand 10 minutes, then carry out 1C electric discharge with reference load, until it reaches electric discharge cut-off condition stops electric discharge, obtains the discharge energy W under the different electric currents of batteryd;
3) efficiency of battery under battery difference electric current is tried to achieve by formula (1):
By battery efficiency η (i) matching under different electric currents, obtain the function of battery efficiency under different electric current:
η=f (i (t)) (2)
4) calculate and obtain battery charging power in the unit interval and be:
Wc(t)=u (t) i (t) Δ t (3)
Being mapped to discharge side is:
Wd(t)=f (i (t)) u (t) i (t) Δ t (4)
Integration obtains the energy being mapped to discharge side in a period of time in battery charging process:
Can be calculated battery static SOCs now is:
(2) adopt different loads that battery is discharged, it is thus achieved that the functional relationship of different loads releasable energy relative reference load, and then obtain the dynamic SOC of batteryd;
1) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty;
2) stand 10 minutes, then respectively to discharge with 0.1-1C 5-8 discharge current (0.6kW, 1.2kW, 1.8kW, 2.4kW, 3.0kW) altogether under different loads, until stopping electric discharge when reaching electric discharge cut-off condition, it is thus achieved that unequally loaded discharge energy WdR; Discharge energy under different loads is carried out data fitting, obtains the function expression f (R) of battery discharging energy under different loads;
A) dump energy of battery when obtaining battery with load R electric discharge end can be calculated by through type (7):
WR=Wdn-f(R)(7)
According to battery static state SOCsCalculate and obtain the energy that battery current time stores:
Wr=Wdn·SOCs(8)
It is then possible to adopt the energy that a certain load R discharging time is released when obtaining battery the present situation:
Δ W=Wr-WR(9)
Dynamic SOC when battery now discharges can be obtained with load RdFor:
The method have the benefit that the present invention applies to all-vanadium flow battery SOC estimation method in direct-current grid, be divided into charging process and discharge process by battery operated, accordingly the energy content of battery is divided into charged side energy and discharge side energy.By the efficiency for charge-discharge of battery under different electric currents, charged side energy is mapped as discharge side energy, it is thus achieved that battery static state SOCs; Using baseline load discharge capacity as reference energy, according to static SOCsWith the dynamic SOC under this load of the discharge capacity estimation battery of battery under different loadsd。
Accompanying drawing illustrates:
Fig. 1 all-vanadium flow battery test platform;
Fig. 2 static state SOCsEstimation result;
The dynamic SOC of Fig. 3dEstimation result.
Detailed description of the invention:
As shown in Figure 1, battery adopts the 3kW/3kWh all-vanadium flow battery with Shenli Science and Technology Co Ltd, Shanghai's R & D Cooperation to all-vanadium flow battery test platform, and its voltage power supply ranges for 39-52V, and discharge cut-off voltage is 39V. Upper computer detection and data collecting system can realize the Real-time Collection of voltage and current, and acquisition precision is 0.1V and 0.1A respectively. DC/DC changer adopts Shanghai Wen Kai power-supply device company limited WYJ-3000W48V changer, output voltage 0-48V. Load is 48V lamp plate, including 60 bulbs that specification is 48V/60W, by switching directly composition in parallel.
1, adopt different electric current respectively battery to be charged, it is thus achieved that the efficiency of battery under different electric currents, and then obtain battery static state SOCs.
1) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty; Stand 10 minutes, then discharge with reference load 0.6kW, until it reaches stop electric discharge during electric discharge cut-off condition, obtain battery charge reference energy WcnWith electric discharge reference energy Wdn。
2) stand 10 minutes, be then charged with different electric currents (30A, 40A, 50A, 60A, 70A, 80A) respectively, when voltage reaches the moment stopping charging that upper limit current starts to reduce, obtain the rechargeable energy W under battery difference electric currentc; Stand 10 minutes, then discharge with 0.6kW, until it reaches electric discharge cut-off condition stops electric discharge, obtains the discharge energy W under the different electric currents of batteryd。
3) available formula (1) tries to achieve the efficiency of battery under battery difference electric current:
By battery efficiency η (i) matching under different electric currents, obtain the function of battery efficiency under different electric current:
η=f (i (t)) (2)
4) calculate and obtain battery charging power in the unit interval and be:
Wc(t)=u (t) i (t) Δ t (3)
Being mapped to discharge side is:
Wd(t)=f (i (t)) u (t) i (t) Δ t (4)
Integration can obtain the energy being mapped to discharge side in a period of time in battery charging process:
Can be calculated battery static SOCs now is:
Fig. 2 is all-vanadium flow battery static state SOCsEstimation result.
2, adopt different loads that battery is discharged, it is thus achieved that the functional relationship of different loads releasable energy relative reference load, and then obtain the dynamic SOC of batteryd。
A) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty;
B) stand 10 minutes, then discharge with different loads (0.6kW, 1.2kW, 1.8kW, 2.4kW, 3.0kW) respectively, until it reaches stop electric discharge during electric discharge cut-off condition, it is thus achieved that unequally loaded discharge energy WdR; Discharge energy under different loads is carried out data fitting, obtains the function expression f (R) of battery discharging energy under different loads;
C) dump energy of battery when obtaining battery with load R electric discharge end can be calculated by through type (7):
WR=Wdn-f(R)(7)
According to battery static state SOCsCalculate and obtain the energy that battery current time stores:
Wr=Wdn·SOCs(8)
It is then possible to adopt the energy that a certain load R discharging time is released when obtaining battery the present situation:
Δ W=Wr-WR(9)
Dynamic SOC when battery now discharges can be obtained with load RdFor:
Accompanying drawing 3 is the dynamic SOC of all-vanadium flow batterydEstimation result.
Above in conjunction with accompanying drawing, embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, it is also possible to make a variety of changes under the premise without departing from present inventive concept.
Claims (1)
1. based on the dynamic SOC of the vanadium cell of charge-discharge energy efficiencydEvaluation method, is characterized in that being divided into charging process and discharge process by battery operated, the energy content of battery is divided into charged side energy and discharge side energy accordingly; By the efficiency for charge-discharge of battery under different electric currents, charged side energy is mapped as discharge side energy, it is thus achieved that battery static state SOCs; Using baseline load discharge capacity as reference energy, according to static SOCsWith the dynamic SOC under this load of the discharge capacity estimation battery of battery under different loadsd, concretely comprise the following steps:
(1) adopt different electric current respectively battery to be charged, it is thus achieved that the efficiency of battery under different electric currents, and then obtain battery static state SOCs;
1) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty; Stand 10 minutes, then carry out 1C electric discharge with reference load, until it reaches stop electric discharge during electric discharge cut-off condition, obtain battery charge reference energy WcnWith electric discharge reference energy Wdn。
2) stand 10 minutes, then it is charged with different electric current 0.1-1C 5-8 charging current (30A, 40A, 50A, 60A, 70A, 80A) altogether respectively, when voltage reaches the moment stopping charging that upper limit current starts to reduce, obtain the rechargeable energy W under battery difference electric currentc; Stand 10 minutes, then carry out 1C electric discharge with reference load, until it reaches electric discharge cut-off condition stops electric discharge, obtains the discharge energy W under the different electric currents of batteryd;
3) efficiency of battery under battery difference electric current is tried to achieve by formula (1):
By battery efficiency η (i) matching under different electric currents, obtain the function of battery efficiency under different electric current:
η=f (i (t)) (2)
4) calculate and obtain battery charging power in the unit interval and be:
(3)
Wc(t)=u (t) i (t) Δ t
Being mapped to discharge side is:
(4)
Wd(t)=f (i (t)) u (t) i (t) Δ t
Integration obtains the energy being mapped to discharge side in a period of time in battery charging process:
Can be calculated battery static SOCs now is:
(2) adopt different loads that battery is discharged, it is thus achieved that the functional relationship of different loads releasable energy relative reference load, and then obtain the dynamic SOC of batteryd;
1) starting vanadium cell, use charger to adopt constant current constant voltage pattern that vanadium cell is charged, until being full of, making vanadium cell keep rotating hot stand-by duty;
2) stand 10 minutes, then discharge with different load 0.1-1C 5-8 discharge current (0.6kW, 1.2kW, 1.8kW, 2.4kW, 3.0kW) altogether respectively, until stopping electric discharge when reaching electric discharge cut-off condition, it is thus achieved that unequally loaded discharge energy WdR; Discharge energy under different loads is carried out data fitting, obtains the function expression f (R) of battery discharging energy under different loads;
3) dump energy of battery when obtaining battery with load R electric discharge end can be calculated by through type (7):
WR=Wdn-f(R)(7)
According to battery static state SOCsCalculate and obtain the energy that battery current time stores:
Wr=Wdn·SOCs(8)
It is then possible to adopt the energy that a certain load R discharging time is released when obtaining battery the present situation:
Δ W=Wr-WR(9)
Dynamic SOC when battery now discharges can be obtained with load RdFor:
。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114566685A (en) * | 2022-02-24 | 2022-05-31 | 国网电力科学研究院武汉南瑞有限责任公司 | Electrolyte flow dynamic control system and method based on vanadium battery SOC estimation |
CN117368743A (en) * | 2023-12-05 | 2024-01-09 | 深圳市易检车服科技有限公司 | Battery health state evaluation method, device, computer equipment and storage medium |
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Patent Citations (6)
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CN102121973A (en) * | 2011-01-04 | 2011-07-13 | 武汉理工大学 | Method for testing net energy of electrical vehicle power battery |
CN102169002A (en) * | 2011-01-04 | 2011-08-31 | 武汉理工大学 | Method for measuring fuel consumption and discharge of hybrid electromobile |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN114566685A (en) * | 2022-02-24 | 2022-05-31 | 国网电力科学研究院武汉南瑞有限责任公司 | Electrolyte flow dynamic control system and method based on vanadium battery SOC estimation |
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CN117368743B (en) * | 2023-12-05 | 2024-03-19 | 深圳市易检车服科技有限公司 | Battery health state evaluation method, device, computer equipment and storage medium |
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