CN106199431B - A kind of exchange monitoring method and system based on battery electron module - Google Patents
A kind of exchange monitoring method and system based on battery electron module Download PDFInfo
- Publication number
- CN106199431B CN106199431B CN201510270071.8A CN201510270071A CN106199431B CN 106199431 B CN106199431 B CN 106199431B CN 201510270071 A CN201510270071 A CN 201510270071A CN 106199431 B CN106199431 B CN 106199431B
- Authority
- CN
- China
- Prior art keywords
- battery
- module
- harmonic
- internal resistance
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 26
- 239000000178 monomer Substances 0.000 claims description 15
- 230000003071 parasitic effect Effects 0.000 claims description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000004146 energy storage Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 15
- 239000003990 capacitor Substances 0.000 description 14
- 238000011084 recovery Methods 0.000 description 13
- 238000007726 management method Methods 0.000 description 10
- 230000010287 polarization Effects 0.000 description 10
- 230000005284 excitation Effects 0.000 description 7
- 230000002457 bidirectional effect Effects 0.000 description 6
- 238000005457 optimization Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002620 method output Methods 0.000 description 1
- 230000024241 parasitism Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Landscapes
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of exchange monitoring method and system based on battery electron module, which includes: harmonic detecting module, and for detecting the harmonic signal in battery electron module, the frequency of harmonic signal is m times of mains frequency, and m is the integer greater than 1；Internal resistance of single cell computing module, for calculating internal resistance of single cell according to the harmonic signal and single battery model of detection；Data processing module, for calculating the state-of-charge of single battery according to the harmonic signal of detection and the internal resistance of single cell；Harmonic injection module controls the battery electron module for the instruction output according to the data processing module and completes the harmonic signal converted between direct current and exchange.The present invention can reduce the cost of battery performance measurement, improve the precision of battery performance measurement, while realize the rapid survey of battery side.
Description
Technical field
The present invention relates to energy fields, and in particular, to a kind of exchange monitoring method based on battery electron module and is
System.
Background technique
Currently, how to store the electric energy in power grid is always energy field major issue urgently to be resolved.In order to certain
This is solved the problems, such as in degree, is become in the prior art by using DC/AC single stage type or DC/DC+DC/AC stage type bidirectional power
Parallel operation realizes the to and fro flow of power between battery and power grid.
Since present energy-storage system is connected into the higher dc-battery group of voltage using multiple batteries, once battery
Any battery unit in group is damaged, then will lead to entire energy-storage system can not work normally, and is not suitable for needing safety
The industrial occasions such as the occasion of power supply, such as coal mine, oil field.
Energy storage is provided in Chinese patent literature " a kind of Modularized medium-voltage energy storage system " (publication number CN102355065)
Implementation, primary side use star-like connection, realize charge and discharge and the functions such as balanced by the control to three phase voltages, but
The energy-storage system when carrying out the control of alternate balanced and fault redundance need to amplitude to three-phase voltage and phase carry out suitable control, by
It intercouples in the control of three phase voltages, control difficulty is higher, is unfavorable for its stable operation.
It is provided in Chinese patent literature " a kind of large capacity in piezoelectric battery energy-storage system " (publication number CN103199630A)
The implementation of another energy storage, battery module still use high-pressure modular, and to bear system itself and cannot overcome
Double frequency power pulsations, certain influence will cause to the service life and normal use of battery, and exchange the company of side direct screening
The mode of connecing can make the accident design of system more complicated, can also generate common mode interference, be unfavorable for the normal of management and control system
Operation.
Therefore, battery itself cannot be overcome to be deposited by the processing mode for connecting to obtain higher DC voltage for battery
Defect, it is impossible to meet the requirements that energy field stores electric energy, it is necessary to provide a kind of new energy-storage system with
Meet the requirement of industry.
In addition, in the process used polarization phenomena, such as internal resistance polarization, concentration polarization and activation polarization can occur for battery
Deng.Polarization phenomena cause the voltage of battery to increase, and charge efficiency reduces, and are filled with the bad phenomenons such as electricity reduction.Inspection can be passed through
The state-of-charge SOC of battery (such as lithium battery) is surveyed to judge the performance of battery, state-of-charge can be defined as in particular power
The ratio of charging capacity and rated capacity that the lower charging regular hour will obtain.State-of-charge may be used as the electricity of assessment battery
The important evidence of information.State-of-charge SOC is related with the model of battery, and aging or technique may make the parameter of battery model not
Together, in order to dynamically update SOC, primary complete battery discharge procedure is needed to be implemented, it has not been convenient to be monitored to battery performance.
Finally, in order to enable energy-storage system plays peak load shifting, improves applied to different power generations, transmission of electricity, distribution occasion
The effects of new-energy grid-connected ability, isolated operation, power grid frequency modulation and backup power source, needs to provide control to energy-storage system, and shows
Energy-storage system be all that battery management system (BMS) and energy conversion system (PCS) are divided into two module compositions, and respectively on
Communication is ceased to master controller, and integrated level is poor, at high cost, it is therefore necessary to propose at low cost, high-efficient energy-storage system control
Technical solution.
Summary of the invention
The present invention provides a kind of, and the exchange based on battery electron module monitors system, which includes: harmonic detecting mould
Block, for detecting the harmonic signal in battery electron module, the frequency of harmonic signal is m times of mains frequency, and m is greater than 1
Integer；Internal resistance of single cell computing module, for calculating single battery according to the harmonic signal and single battery model of detection
Internal resistance；Data processing module, for calculating the charged of single battery according to the harmonic signal of detection and the internal resistance of single cell
State；Harmonic injection module is completed for controlling the battery electron module according to the instruction of data processing module output
The harmonic signal converted between direct current and exchange.
Preferably, the data processing module be also used to export the control battery electron module complete direct current with exchange
Between the control signal that converts, it is defeated that the frequency of the control signal of the data processing module output is greater than the harmonic injection module
The frequency of harmonic signal out.
Preferably, the harmonic detecting module includes current harmonics detection module and voltage harmonic detection module, the electricity
Stream harmonic detecting module is for detecting current harmonics signal, and the voltage harmonic detection module is for detecting voltage harmonic signal.
Preferably, the single battery model includes equivalent constant pressure source, single battery, internal resistance of single cell, single battery
The cathode of internal resistance parasitic capacitance and discharge resistance, the equivalent constant pressure source is connect with the cathode of the single battery, the list
The equivalent constant pressure source is serially connected in after body internal resistance of cell parasitic capacitance is in parallel with the internal resistance of single cell with the discharge resistance
It is positive between the anode of the single battery.
Preferably, the control signal of the harmonic signal of the harmonic injection module output and data processing module output
The battery electron module is driven after superposition.
Preferably, the single battery is single lithium battery.
Preferably, the state-of-charge is calculate by the following formula: soc (n)=soc (n-1)+β0R(n)+β1U(n)+β2I(n)+
β3soc(n-1)；Wherein state-of-charge of the soc (n) for current time, state-of-charge of the soc (n-1) when last moment, R (n) are
The internal resistance of single cell at current time, U (n) are the harmonic voltage of current time detection, and I (n) is the harmonic wave of current time detection
Electric current, β0、β1、β2And β3For preset coefficient.
Correspondingly, the present invention provides a kind of exchange monitoring methods based on battery electron module, this method comprises: to electricity
Sub- power module output controls the battery electron module and completes the harmonic signal converted between direct current and exchange, harmonic signal
Frequency is m times of mains frequency, and m is the integer greater than 1；Detect the harmonic signal of battery electron module output；According to detection
Harmonic signal and single battery model calculate internal resistance of single cell；Believed according to the internal resistance of single cell and the harmonic wave of detection
Number calculate single battery state-of-charge.
Preferably, this method further include: control the battery electron module to battery electron module output and complete directly
The control signal converted between stream and exchange, the frequency for controlling signal are greater than the frequency of harmonic signal.
Preferably, the harmonic signal of detection battery electron module output includes: detection harmonic current signal；And detection inspection
Survey harmonic voltage signal.
Preferably, the single battery model includes equivalent constant pressure source, single battery, internal resistance of single cell, single battery
The cathode of internal resistance parasitic capacitance and discharge resistance, the equivalent constant pressure source is connect with the cathode of the single battery, the list
The equivalent constant pressure source is serially connected in after body internal resistance of cell parasitic capacitance is in parallel with the internal resistance of single cell with the discharge resistance
It is positive between the anode of the single battery.
Preferably, the harmonic signal exported to the Said electronic power module and the control exported to the Said electronic power module
Signal is overlapped mutually.
Preferably, the state-of-charge of the single battery is calculate by the following formula: soc (n)=soc (n-1)+β0R(n)+β1U
(n)+β2I(n)+β3soc(n-1)；Wherein soc (n) is the state-of-charge at current time, and soc (n-1) is charged when last moment
State, R (n) are the internal resistance of single cell at current time, and U (n) is the harmonic voltage of current time detection, and I (n) is current time
The harmonic current of detection, β0、β1、β2And β3For preset coefficient.
The present invention can carry out DC/AC transformation by multiple groups battery unit to provide electric power, thus one group wherein
When battery can not work normally, power supply is not influenced.Further, since A phase, B phase and the control of C phase voltage are full decoupled, it is not necessarily to
Coordinate three-phase voltage between amplitude and phase, can carry out it is simpler control and it is more reliable.It is provided by the invention cell performance
The scheme of being capable of measuring can reduce the cost of battery performance measurement, improve the precision of battery performance measurement, while realize battery side
Rapid survey.In addition, the present invention can control PCS and the control of BMS combines, so as to effectively integrate and coordinate
PCS power section control with battery system control and apply, and can reduce cost improve scalability, be easy to battery electron
Module carries out series-parallel and hot plug.The present invention can also test the state-of-charge of battery by high frequency pumping, realize battery energy
Amount is balanced, and is easy to implement the integrated of PCS and BMS control function.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is battery electron module diagram provided by the invention；
Fig. 2 is battery electron module input side schematic diagram provided by the invention；
Fig. 3 is the outlet side schematic diagram of energy-storage system provided by the invention；
Fig. 4 is energy-storage system schematic diagram provided by the invention；
Fig. 5 is exchange monitoring system schematic provided by the invention；
Fig. 6 is single battery model schematic；
Fig. 7 is to decompose resulting each harmonic waveform；
Fig. 8 is that state-of-charge calculates schematic diagram；
Fig. 9 is exchange monitoring method schematic diagram provided by the invention；
Figure 10 is the schematic diagram of battery management system and PCS control system in the prior art；
Figure 11 is that the present invention provides battery electron management schematic diagram；
Figure 12 is internal resistance of single cell identification principle figure provided by the invention；
Figure 13 is battery balanced schematic diagram provided by the invention；
Figure 14 is battery electron management system schematic diagram provided by the invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
It is of the invention for ease of description, when describing the composition of energy-storage system, mainly said from battery powered angle
It is bright, but it should be recognized that those skilled in the art can be by the term input/output for including but is not limited to, primary side/secondary
After side is exchanged, embodiment that also available power grid charges to battery.
Fig. 1 shows battery electron module diagram comprising battery, bidirectional power converter and transformer, the change
The function of depressor is mainly isolation input side and outlet side.Those skilled in the art will be seen that, single battery shown herein
It can be the battery being made of several small rechargeable cells, such as can be plumbic acid element battery or lithium battery.Even if
In this way, the voltage of the battery of the rechargeable cell composition after series connection may only have tens volts so as to also smaller
Voltage, such as 36V or 48V, the far smaller than voltage of battery used in battery electron module in the prior art, therefore existing
There are at least several hectovolts of cell voltage used in technology, such as 300V or more.Bidirectional power converter can convert direct current
At exchange, exchange can also be converted into direct current, so as to enable to deposit from battery electron module to grid power transmission
The extra energy of storage net.
Fig. 2 is the schematic diagram of battery electron module input side provided by the invention, it should be understood that, if user
The alternating current greater than DC voltage is not needed, battery electron module shown in fig. 1 can directly carry out Alternating Current Power Supply.Such as Fig. 1 institute
Show, in order to realize that battery electron module can export the function of alternating current from grid charging comprising battery and extremely
Few two bidirectional power converters.As can be seen from Figure 1 the input terminal of power inverter is separately connected with battery both ends, in electricity
The anode in pond is serially connected with inductance L.
As an example, power inverter is made of three H bridging parallel operations in parallel, each H bridging changes can be by 4
IGBT composition.For the ease of battery electron module for power supply, in the input terminal shunt capacitance of each power inverter, such as capacitor
C1、C2、C3、......、Cn.Battery electron module shown in FIG. 1 shows that n group bidirectional power converter, n are generally higher than in total
Or it is equal to 2.There are two output ends for each H bridging parallel operation tool, export A phase voltage, B phase voltage and C phase voltage respectively.It needs
Bright, in order to facilitate battery to capacitor charging, the present invention also provides pre-charge module (not shown)s.Preferably, often
A charging capacitor can correspond to a pre-charge module, and pre-charge module includes resistance and contactor, and resistance and contactor are simultaneously
Connection, and one end after resistance and contactor parallel connection is connect by inductance L with anode, it is another after resistance and contactor parallel connection
The connection of the input terminal of one end and power inverter.Contactor can be a switch, can be closed when the voltage of capacitor reaches
Carry out short-circuit resistance, so that the voltage of capacitor is identical with the voltage of battery.
Higher voltage in order to obtain can carry out transformation to the three-phase electricity that power inverter exports, specifically such as Fig. 2 institute
Show.The first A phase transformer corresponding with the quantity of power inverter, the first B phase transformer and the first C phase transformation are shown in Fig. 2
The connection type of depressor, the first A phase transformer, the first B phase transformer and the first C phase transformer is essentially identical.It is each in Fig. 2
A phase output terminal A1-1a, A1-1b of power inverter, A1-2a, A1-2b, A1-3a, A1-3b ..., A1-na, A1-nb points
It is not connect with the primary side of n the first A phase transformers, the secondary side of the first A phase transformer is connected in series, the first A after concatenation
Secondary side one end A1- of phase transformer is grounded and other end A1+ through inductance La1 exports A phase voltage.Correspondingly, each power becomes
B phase output terminal B1-1a, B1-1b of parallel operation, B1-2a, B1-2b, B1-3a, B1-3b ..., B1-na, B1-nb respectively with n
The primary side of a first B phase transformer connects, and the secondary side of the first B phase transformer is connected in series, the first B phase-change pressure after concatenation
Secondary side one end B- of device is grounded and other end B1+ through inductance Lb1 exports B phase voltage；The C phase output terminal of each power inverter
C1-1a, C1-1b, C1-2a, C1-2b, C1-3a, C1-3b ... .., C1-na, C1-nb respectively with n the first C phase transformer
Primary side connection, the secondary side of the first C phase transformer are connected in series, secondary side one end C- of the first C phase transformer after concatenation
Ground connection and other end C1+ through inductance Lb1 export C phase voltage.
It should be noted that three-phase voltage illustrated in fig. 2 is star-like connection.Those skilled in the art can carry out triangle
Shape connection, that is to say, that the first B phase transformer after the secondary side of the first A phase transformer after concatenation, concatenation it is secondary
Side and concatenation after the first C phase transformer secondary side successively join end to end with by A phase inductance output A phase voltage,
B phase voltage is exported by B phase inductance and exports C phase voltage by C phase inductance.
Fig. 3 shows the schematic diagram of energy-storage system, wherein multiple batteries can be used in order to increase the power of energy-storage system
Electronic module forms energy-storage system.Fig. 3 gives the embodiment that energy-storage system is made of M battery electron module, and wherein M is big
In or equal to 2.As shown, M group battery electron module produces three-phase voltage, make when generating three-phase voltage for every group of battery
With n power inverter, A phase voltage is connected to the 2nd A phase transformer respectively, B phase voltage is connected to the 2nd B phase-change pressure
C phase voltage is connected to the 2nd C phase transformer by device.In Fig. 3, by input terminal A1-1a, A1-1b ..., A1-na,
A1-nb, A2-1a, A2-1b ..., A2-na, A2-nb, AM-1a, AM-1b ..., AM-na, AM-nb can produce respectively
The corresponding A phase voltage of life each group battery.It is similar with the battery electron module for the 1st group, in the battery electron for being directed to 2-M group
In module, the secondary side of the first A phase transformer after series connection connect latter end ground connection GND and other end A2+-AM+ through inductance
La2-LaM exports A phase voltage, and M A phase voltage of M group battery generation accesses the identical primary side of the 2nd A phase transformer
Input terminal, and another input end grounding of the primary side of the 2nd A phase transformer, and one end of the secondary side of the 2nd A phase transformer
It is grounded other end U and exports A phase voltage.Similarly, similar with the battery electron module for the 1st group, in the electricity for being directed to 2-M group
In the electronic module of pond, the latter end of secondary side series connection of the first B phase transformer after series connection is grounded GND and other end B2+-BM+ is passed through
Inductance Lb2-LbM exports B phase voltage, and the M B phase voltage that M group battery generates accesses identical the one of the 2nd B phase transformer
Secondary side input terminal, and another input end grounding of the primary side of the 2nd B phase transformer, and the secondary side of the 2nd B phase transformer
One end is grounded other end V and exports B phase voltage；It is similar with the battery electron module for the 1st group, in the battery for being directed to 2-M group
In electronic module, the secondary side of the first C phase transformer after series connection connect latter end ground connection GND and other end C2+-CM+ through electricity
Feel Lb2-LbM and export C phase voltage, and the M C phase voltage that M group battery generates accesses the identical primary of the 2nd C phase transformer
Side input terminal, and another input end grounding of the primary side of the 2nd C phase transformer, and the one of the secondary side of the 2nd C phase transformer
End ground connection other end V exports C phase voltage.
When charging from power grid to battery electron module, control flows into the electric current phase of each H bridge in each power inverter
90 degree of phase difference, and so that the voltage-phase of each H bridge is slightly ahead of grid line voltage-and determine electrical angle, adjust phase between the two
Parallactic angle difference is the size of adjustable charge power.When discharging from battery electron module to power grid, control is flowed out each power and is become
The current phase of each H bridge differs 90 degree in parallel operation, and so that the voltage-phase of each H bridge is slightly lagged behind network voltage-and determine electric angle
Degree adjusts the size of the i.e. adjustable discharge power of phase angle difference between the two.In battery electron module discharge, when multiple electricity
When the energy difference of pond group storage, the ratio for the energy that can be stored according to each battery pack controls the list of each power inverter
The output voltage amplitude of phase H bridge, so that the active power of output of each energy-storage units is directly proportional to the energy that it is stored, so that respectively
Balancing energy between a battery pack, avoids overdischarge.In the charging of battery electron module, when the energy of each battery pack storage is unequal
When, the output voltage amplitude of the single-phase H bridge of each power inverter is controlled according to the ratio of the chargeable energy of each battery pack,
It may make the corresponding input active power of each battery pack directly proportional to its chargeable energy, so that between each battery pack
Balancing energy avoids overcharge.
Polarization phenomena, such as internal resistance polarization, concentration polarization and activation polarization etc. can occur during use for battery,
Polarization phenomena will lead to the reduced performance of battery.In order to enable energy-storage system smoothly to work, battery performance is supervised
It is very important for survey.In order to monitor the performance of battery, preferably the battery in battery is monitored in the present invention.In order to
Convenient for monitoring the performance of single battery, select to be monitored the state-of-charge SOC of single battery in the present invention.
Fig. 5 shows exchange monitoring system provided by the invention, and it includes: harmonic detecting module which, which monitors system, uses
Harmonic signal in detection battery electron module, the frequency of harmonic signal are m times of mains frequency, and m is the integer greater than 1；
Internal resistance of single cell computing module, for calculating internal resistance of single cell according to the harmonic signal and single battery model of detection；
Data processing module, for calculating the state-of-charge of single battery according to the harmonic signal of detection and the internal resistance of single cell；
Harmonic injection module, for according to the instruction of data processing module output control the battery electron module complete direct current and
The harmonic signal converted between exchange.The single battery that the present invention is previously mentioned refers to battery pack used in battery electron module
Each of independent battery unit.In addition, it is necessary to explanation, data processing module can indicate that harmonic injection module exports
One or more of harmonic waves can also indicate that harmonic injection module is sequentially output all harmonic waves within the scope of 20Hz-800Hz.Power grid
Frequency refers generally to the frequency of industrial electrical network, and the mains frequency in China is 50Hz, and also there are the power grid using 60Hz frequency in other countries.
It will be appreciated by persons skilled in the art that mains frequency, which can according to need, to be set, and is regardless of for try net
Mud is in the mains frequency of industrial electrical network.
Battery electron module of the present invention can be any battery electron module having been carried out in the prior art.
Preferably, battery electron module is using the battery electron module disclosed in Fig. 1-Fig. 4.Current electrons module mainly includes battery
Group, bidirectional power converter (can be realized by the IGBT inversion unit that IGBT element forms) and the transformation for playing buffer action
Device.IGBT inversion unit in Fig. 5 contains 6 IGBT, and each IGBT has collector C, emitter E and grid G, and IGBT can
To be turned on or off under the control of data processing module, so as to complete the transformation between direct current and exchange.In order to electricity
Pond electronic module carries out direct current and exchange conversion is controlled, and data processing module needs to export corresponding control signal, the control
Signal processed can be the sine wave signal in frequency 5kHz to 50kHz range.As can be seen that the frequency of control signal is greater than injection
To the frequency of the harmonic signal of battery electron module.
It generates pwm signal as shown in figure 5, triangular wave is compared by data processing module with harmonic wave and is applied to driving
Plate is driven the IGBT in battery electron module to be turned on or off by driving plate.Driving plate, which is mainly used for output, has predetermined electricity
Pressure amplitude value and duty ratio, the driving signal of switching tube can be directly driven.Fig. 7 shows showing for fundamental signal and harmonic signal
It is intended to.
As shown in figure 5, harmonic detecting module may include Harmonic currents detection module and harmonic voltage detection module, harmonic wave
Current detection module is for detecting harmonic current signal, and harmonic voltage detection module is for detecting harmonic voltage signal.Harmonic wave inspection
Surveying signaling module can be realized by currently existing scheme.
As described above, including battery pack in battery electron module.In the present invention when calculating state-of-charge SOC, consider to make
Use single battery.Single battery model is as shown in fig. 6, include equivalent constant pressure source, single battery, internal resistance of single cell R1, monomer
Internal resistance of cell parasitic capacitance C1And discharge resistance R0, the cathode connection of the cathode and single battery of equivalent constant pressure source, monomer electricity
Equivalent constant pressure source anode and single battery are serially connected in discharge resistance after pond internal resistance parasitic capacitance is in parallel with internal resistance of single cell
Between anode.Single battery model is mainly used for calculating internal resistance of single cell R1, other parameters in single battery model can be with
It is obtained from producer.The specific calculating process of internal resistance of single cell is described below.
As shown in fig. 6, available according to voltage loop theorem:
E0-IBR0-VC-VB=0 (1)
Wherein, E0It is the voltage of equivalent constant pressure source, IBIt is loop current, VCIt is parasitic capacitance C1The voltage at both ends, VBIt is single
The voltage of body battery.
Capacitance voltage VCIt is to meet following differential equation state:
The differential equation of first order is solved:
Formula (3) and formula (1), which combine, generates following voltage equation:
This equation can be applied to four kinds of different situations, these state equations can be bent as output current-voltage
The important parameter of line is estimated.
1) as t → ∞, IBWhen=0,
2) as t ≠ ∞, IBWhen=0,
3) as t ≠ ∞, IBWhen ≠ 0,
VC(0)=0
4) as t ≠ ∞, IBWhen ≠ 0,
VC(0)≠0
Internal resistance of single cell R can be calculated by formula (8)1.Above-mentioned single battery can be single lithium battery.
SOC numerical procedure according to figure 8 can be humorous in conjunction with detection electric current after calculating internal resistance of single cell
Wave, voltage harmonic simultaneously calculate state-of-charge SOC according to the following formula.
Soc (n)=soc (n-1)+β0R(n)+β1U(n)+β2I(n)+β3soc(n-1) (9)
Wherein soc (n) is the state-of-charge at current time, and state-of-charge of the soc (n-1) when last moment, R (n) is to work as
The internal resistance of single cell at preceding moment, U (n) are the harmonic voltage of current time detection, and I (n) is the harmonic wave electricity of current time detection
Stream, β0、β1、β2And β3For preset coefficient, can numerical value between 0.1-0.8, such as β0=0.2, β1=0.5, β2=
0.3, β3=0.7.For β0、β1、β2And β3Value, can be by testing to obtain several times.It should be noted that β0、
β1、β2And β3The SOC that is calculated of value may there are little bit differents with true SOC, but can be according to twice
Difference between calculated SOC can reflect out battery performance variation, this can for the reference that user takes timely measure,
For example, if relative to initial SOC, if current calculated SOC is less than the 20% of initial SOC, replacement monomer electricity can be passed through
Pond changes current situation.
In Fig. 8, u (t) indicates that the voltage of detection, i (t) indicate the electric current of detection, u1(t) voltage fundamental signal, u are indicatedk
(t) voltage k rd harmonic signal is indicated, ω is fundamental signal angular frequency, and a is phase.Correspondingly, i1(t) current first harmonics letter is indicated
Number, ik(t) electric current k rd harmonic signal is indicated.
The original state of SOC can be obtained according to open-circuit voltage, and the relationship between open-circuit voltage and SOC can be mentioned by battery
The standard curve provided for quotient obtains.After the stationary state of battery refers to that battery work stops, it is transferred to charging and discharging state, this shape
The initial value that the calculation amount of SOC is estimated as SOC under charging and discharging state under state.Due under this state the characteristics of be electric current be zero,
Non-polarized phenomenon, SOC value and open-circuit voltage have good corresponding relationship, therefore can directly estimate battery with open circuit voltage method
SOC value
Voltage harmonic injection unit, voltage harmonic required for mainly issuing.Issuing harmonic signal is 20-800Hz's
Harmonic wave, as shown in fig. 7, the harmonic wave enters single battery model, final result after detecting by battery harmonic signal detection unit
SOC state is calculated by being analyzed feedback signal and being demodulated into data processing module.
As described above, harmonic injection module can export the harmonic signal of 20Hz-800Hz, illustrate harmonic injection below
Principle.
For ideal sinusoidal voltage, sinusoidal voltage waveform u (t) be may be expressed as:
Wherein, U is voltage effective value, and α is initial phase angle, and ω is angular frequency, and the π f=2 of ω=2 π/T, f are mains frequency, and T is
Grid cycle.
For cycle T=2 π/ω non-sinusoidal voltage u (ω t), meet Di Liheli condition, can be analyzed to following form
Fourier space:
In formula:
In above formula, i=1,2,3 ..., frequency is that the component of 1/T is known as fundamental wave, and frequency is greater than 1 integer wave fundamental wave frequency
The component of rate is harmonic wave.In harmonic signal, it is two times of fundamental frequency, three times or four times of letter that frequency, which can be injected,
Number, the signal of higher frequency also can be injected.It, can will be within the scope of 20Hz-800Hz in order to comprehensively detect state-of-charge
All harmonic waves are implanted sequentially battery electron module, can be relatively more comprehensive so as to obtain the state-of-charge for each frequency
The ground performance of electrolytic cell.In the process of harmonic injection, by changing the phase angle of odd harmonic and fundamental wave, and change harmonic wave with
Fundamental voltage amplitude proportionate relationship, to generate target harmonic signal.
Correspondingly, as shown in figure 9, the present invention provides a kind of exchange monitoring method based on battery electron module, the party
Method includes: to control the battery electron module to the output of battery electron module to complete the harmonic wave converted between direct current and exchange letter
Number, the frequency of harmonic signal is m times of mains frequency, and m is the integer greater than 1；Detect the harmonic wave letter of battery electron module output
Number；Internal resistance of single cell is calculated according to the harmonic signal of detection and single battery model；According to the internal resistance of single cell with
And the harmonic signal calculates the state-of-charge of single battery.About the detailed process of each step, it is referred to above-mentioned to being
The description of system modules, details are not described herein again.
For the function of realizing energy-storage system storage electric energy and power to power grid, need to control energy-storage system.
It is battery management system and PCS control system in the prior art that Figure 10, which is shown, it can be seen that battery management and PCS control separate
It carries out, and since the two is by independent physics realization, is communicated between the two to carry out the interaction of parameter.In order to avoid
Communication postpones, and battery management and PCS control can be combined.For this purpose, the present invention provides electricity as shown in figure 11
Pond management method schematic diagram, this method comprises: according to the monomer battery voltage of acquisition；According to determining pair of monomer battery voltage state
Single battery executes at least one of following operation: excitation operation, optimization operation and equalization operation；According to determining behaviour
Make to single battery output pwm signal.
Specifically, can be triggered according to the following conditions in excitation operation, optimization operation and equalization operation at least
One:
If the voltage of single battery is Vd,
As 3.6V > Vd > 3.4V or 3.0V < V < 3.2V, operated into excitation；
As 3.2V≤Vd≤3.4V, operated into optimization；
As Vd >=3.6V or Vd≤3.0V, into equalization operation.
When carrying out excitation operation, can there will be the pumping signal of setting driving frequency to be compared generation with triangular wave
The PWM of pumping signal, the PWM wave can be by comparing pumping signal and triangular waveforms at the square wave of change in duty cycle.
When optimizing operation, recovery state can be transferred to carry out battery single battery in a suitable case
Optimization specifically includes from discharging into recovery state and from being charged to recovery state:
If (a) battery is in from discharge condition, the state-of-charge threshold value for entering recovery state is calculated according to the following formula: being entered
Recovery state
SOCt=SOCd+M × t/ (8 × Q) × 100%.
When state-of-charge reaches SOCt, single battery can be entered recovery state by discharge condition；Wherein in formula: SOCt
For the state of charge under recovery state；SOCd is state of charge when discharge condition terminates；M is in battery discharge procedure
Accumulation electricity (can restore)；T is the time that battery is undergone under recovery state；Q is the actual capacity of battery.
If (b) battery is in charged state, the state-of-charge threshold value for entering recovery state is calculated according to the following formula: if from filling
Electricity condition enters recovery state
SOCt=SOCc+M × t/ (8 × Q) × 100%
When state-of-charge reaches SOCt, single battery can be entered recovery state by charged state；Wherein in formula: SOCt
For the state of charge under recovery state；SOCc is state of charge when charged state terminates；M is in battery charging process
Accumulation electricity (can restore)；T is the time that battery is undergone under recovery state；Q is the actual capacity of battery.
As shown in figure 13, energy between two neighboring battery is realized by the duty ratio of control switch device drive signal PWM
The transmitting of amount, such as single battery B1With single battery B2Between or single battery B2With single battery B3Between.If such as
Battery cell B1Capacity is higher than battery cell B2Capacity, single-pole double-throw switch (SPDT) S1Open single-pole double-throw switch (SPDT) S2When shutdown, balanced electricity
Hold C11With battery cell B1Parallel connection, battery cell B1Transfer energy to balanced capacitor C11；Single-pole double-throw switch (SPDT) S1Turn off hilted broadsword
Commutator S2When opening, balanced capacitor C11With battery cell B2Parallel connection, balanced capacitor C11Transfer energy to battery cell
B2, complete the energy transmission in this period.And so on, opening and turning off by control switch device utilizes capacitor reality
The transmitting one by one of existing energy.
The internal resistance of single battery can change with the extension using the time of battery, and internal resistance is characterization battery
Important parameter, it is therefore necessary to detect the internal resistance of battery.In order to detect the internal resistance of battery, Figure 12 shows the original of internal resistance detection
Reason figure.As shown in figure 12, internal resistance of cell Rx, battery connected measuring resistance Rn, can be controlled by two single-pole double-throw switch (SPDT)s
System measurement RxThe voltage V at both endsxAnd RnThe voltage V at both endsn.It is available that rate is determined according to ohm: Vn=IRn；Vx=IRx,
Middle I is the electric current by battery.According to the available R of above formulax·Rv·Vx/Vn。
After obtaining internal resistance of single cell, the state-of-charge that battery can be obtained according to internal resistance calculates state-of-charge
SOC.State-of-charge SOC can be obtained according to the curve between state-of-charge SOC and internal resistance.
There are also the charge storage energy of battery other than SOC (major embodiment charge and discharge time) for the parameter of characterization battery performance
Power SOH (major embodiment battery life), the calculation of SOC and SOH are as follows:
Wherein, SOC (t) is SOC of the battery in t moment；Q (t0) is remaining capacity of the battery at the initial t0 moment；I is electricity
The instantaneous value of pond operating current, general electric discharge take just, and charging takes negative；η is the corresponding efficiency for charge-discharge of electric current i, the appearance with battery
Flow characteristic is related；Q0 is the rated capacity of battery；SOC (t0) is the SOC of initial t0 moment battery；Δ SOC indicates t0 to t moment
The variable quantity of battery SOC.
Wherein, Qmax(aged) maximum available of present battery, Q are indicatednominal(new) the specified of new battery is indicated
Capacity.
As described above, the internal resistance of cell can change with the increase for using the time.In order to smart after the internal resistance of cell changes
Really obtain SOC, measured after battery is full of full of voltage and it is specified full of voltage deviation be greater than 3% after, by apply swash
Signal is encouraged to calculate SOC.It is 20Hz-800Hz, motivates electricity specifically, working frequency can be applied at single battery both ends
The AC sine wave signal that size is 20mA is flowed, then with measurement exciting current faint induced electricity caused by battery both ends
Pressure, obtained induced voltage are divided by with the exciting current being applied on battery the internal resistance value of the available battery again.
This internal resistance of cell value measured by voltage excitation signals had both included the impedance value of internal resistance, further included internal resistance of cell parasitism ginseng
Several induction reactance values, can accurately reflect battery capacity information.SOC is calculated by applying pumping signal to have carried out above in detail
Thin statement (referring to formula 9), details are not described herein again.
Correspondingly, battery leads to the performance of each single battery with using the increase performance of time to be also gradually deteriorated
It is different, it is therefore necessary to the single battery performance used is prejudged, such as is higher than the battery of threshold value using only SOC or SOH,
It was found that there is other then to issue alarm signal to host computer less than or equal to the battery of threshold value.
In addition, the voltage of each single battery can also generate difference during battery use, it is necessary to monomer electricity
The voltage in pond carries out balanced.Figure 13 shows battery balanced schematic diagram, 3 single batteries is shown, in each monomer
Single-pole double-throw switch (SPDT) S is provided between the positive and negative anodes of battery1、S2、S3, the positive and negative anodes of single battery respectively with single-pole double-throw switch (SPDT)
Knife connection, be provided with balanced capacitor C between the throwing of connected single-pole double-throw switch (SPDT)11、C21, may be implemented by switch control
Switching of the capacitor between two neighboring unit cells.When capacitor is parallel to the relatively high monomer both ends of voltage, battery can be right
Capacitor charging, and after switching, capacitor again can charge to the lower monomer of voltage, and energy between monomer so can be realized
Transfer, to achieve the purpose that battery pack balancing.It is right when detecting that voltage difference values among single batteries are more than setting value in battery pack
Battery carries out balanced.
It, can be according to calculation after determination can carry out excitation operation, optimization operation, and/or equalization operation to single battery
Method output pwm signal is managed battery and controls PCS.Needed for power device by calculating PCS inverter
The switching frequency and duty ratio wanted, data processing module shown in Fig. 5 is interior to generate pwm signal, and the pwm signal is by standard
Driving plate drives the switching tube of battery electron inside modules, and realizes the control to PCS.
Correspondingly, the present invention provides a kind of battery electron management systems, and as shown in figure 14, which includes: that voltage is adopted
Collect module, for acquiring monomer battery voltage state；Determining module is operated, for true according to the monomer battery voltage state of acquisition
It is fixed that at least one of following operation: excitation operation, optimization operation and equalization operation is executed to single battery；Pwm signal is defeated
Module out, for according to determining operation to single battery output pwm signal.Preferably, which can also include monomer electricity
Pond internal resistance computing module, for calculating internal resistance of single cell.Above-mentioned voltage acquisition module, operation determining module, pwm signal are defeated
Module, and/or internal resistance of single cell computing module etc. can be realized in data processing module out.Since the present invention is right
Its method provided is described in detail, and for the implementations of modules, details are not described herein.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (13)
1. a kind of exchange based on battery electron module monitors system, which is characterized in that the system includes:
Harmonic detecting module, for detecting the harmonic signal in battery electron module, the frequency of harmonic signal is the m of mains frequency
Times, m is the integer greater than 1；
Internal resistance of single cell computing module, for being calculated in single battery according to the harmonic signal and single battery model of detection
Resistance；
Data processing module, for calculating the charged shape of single battery according to the harmonic signal of detection and the internal resistance of single cell
State；
Harmonic injection module is completed directly for controlling the battery electron module according to the instruction of data processing module output
The harmonic signal converted between stream and exchange.
2. system according to claim 1, which is characterized in that the data processing module is also used to export the control electricity
Pond electronic module completes the control signal converted between direct current and exchange, the frequency of the control signal of the data processing module output
Rate is greater than the frequency of the harmonic signal of harmonic injection module output.
3. system according to claim 1, which is characterized in that the harmonic detecting module includes current harmonics detection module
With voltage harmonic detection module, the current harmonics detection module is for detecting current harmonics signal, the voltage harmonic detection
Module is for detecting voltage harmonic signal.
4. system according to claim 1, which is characterized in that the single battery model includes equivalent constant pressure source, monomer
Battery, internal resistance of single cell, internal resistance of single cell parasitic capacitance and discharge resistance, the cathode of the equivalent constant pressure source and institute
The cathode connection for stating single battery, puts after the internal resistance of single cell parasitic capacitance is in parallel with the internal resistance of single cell with described
Resistance is serially connected between the equivalent constant pressure source anode and the anode of the single battery.
5. system according to claim 2, which is characterized in that the harmonic signal of harmonic injection module output and described
The battery electron module is driven after the control Signal averaging of data processing module output.
6. system according to claim 1, which is characterized in that the single battery is single lithium battery.
7. system according to claim 3, which is characterized in that the state-of-charge is calculate by the following formula:
Soc (n)=soc (n-1)+β0R(n)+β1U(n)+β2I(n)+β3soc(n-1)；
Wherein soc (n) is the state-of-charge at current time, state-of-charge of the soc (n-1) when last moment, when R (n) is current
The internal resistance of single cell at quarter, U (n) are the harmonic voltage of current time detection, and I (n) is the harmonic current of current time detection,
β0、β1、β2And β3For preset coefficient, n indicates current time, and n-1 indicates last moment.
8. a kind of exchange monitoring method based on battery electron module, which is characterized in that this method comprises:
The battery electron module, which is controlled, to the output of battery electron module completes the harmonic signal converted between direct current and exchange, it is humorous
The frequency of wave signal is m times of mains frequency, and m is the integer greater than 1；
Detect the harmonic signal of battery electron module output；
Internal resistance of single cell is calculated according to the harmonic signal of detection and single battery model；
The state-of-charge of single battery is calculated according to the internal resistance of single cell and the harmonic signal of detection.
9. according to the method described in claim 8, it is characterized in that, this method further include:
The battery electron module, which is controlled, to battery electron module output completes the control converted between direct current and exchange letter
Number, the frequency for controlling signal is greater than the frequency of harmonic signal.
10. according to the method described in claim 8, it is characterized in that, the harmonic signal of detection battery electron module output includes:
Detect harmonic current signal；And
Detection detection harmonic voltage signal.
11. according to the method described in claim 8, it is characterized in that, the single battery model includes equivalent constant pressure source, monomer
Battery, internal resistance of single cell, internal resistance of single cell parasitic capacitance and discharge resistance, the cathode of the equivalent constant pressure source and institute
The cathode connection for stating single battery, puts after the internal resistance of single cell parasitic capacitance is in parallel with the internal resistance of single cell with described
Resistance is serially connected between the equivalent constant pressure source anode and the anode of the single battery.
12. according to the method described in claim 9, it is characterized in that, to the battery electron module export harmonic signal and
The control signal exported to the battery electron module is overlapped mutually.
13. according to the method described in claim 8, it is characterized in that, the state-of-charge of the single battery is calculate by the following formula:
Soc (n)=soc (n-1)+β0R(n)+β1U(n)+β2I(n)+β3soc(n-1)；
Wherein soc (n) is the state-of-charge at current time, state-of-charge of the soc (n-1) when last moment, when R (n) is current
The internal resistance of single cell at quarter, U (n) are the harmonic voltage of current time detection, and I (n) is the harmonic current of current time detection,
β0、β1、β2And β3For preset coefficient, n indicates current time, and n-1 indicates last moment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014107909053 | 2014-12-18 | ||
| CN201410790905 | 2014-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106199431A CN106199431A (en) | 2016-12-07 |
| CN106199431B true CN106199431B (en) | 2018-12-28 |
Family
ID=57460069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510270071.8A Active CN106199431B (en) | 2014-12-18 | 2015-05-25 | A kind of exchange monitoring method and system based on battery electron module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106199431B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752658B (en) * | 2017-11-03 | 2021-06-29 | 致茂电子(苏州)有限公司 | Battery testing device and battery testing method |
| CN108646188A (en) * | 2018-04-28 | 2018-10-12 | 北京新能源汽车股份有限公司 | Dynamic internal resistance testing method, device and equipment for power battery and automobile |
| CN112731180A (en) * | 2020-12-28 | 2021-04-30 | 上能电气股份有限公司 | Energy storage system and internal resistance detection method thereof |
| CN113783252B (en) * | 2021-08-26 | 2024-04-16 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting device for balancing among battery clusters |
| CN114865896A (en) * | 2022-01-25 | 2022-08-05 | 上海交通大学 | High-voltage direct-hanging energy storage method and system for eliminating battery charging and discharging frequency doubling current |
| CN115495921B (en) * | 2022-09-29 | 2023-04-07 | 东南大学 | Power electronic system simulation method based on loop current method decoupling |
| CN117175747B (en) * | 2023-10-27 | 2024-03-05 | 上海交通大学 | High-voltage energy storage power system and battery cluster state accurate sensing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594116U (en) * | 2009-11-30 | 2010-09-29 | 比亚迪股份有限公司 | Measuring device of battery internal resistance |
| TW201113542A (en) * | 2009-10-06 | 2011-04-16 | shun-chang Zhang | Detection platform for battery performance |
| CN103645382A (en) * | 2013-12-13 | 2014-03-19 | 艾德克斯电子（南京）有限公司 | On-line battery internal resistance measuring apparatus and measuring method thereof |
| CN103683359A (en) * | 2012-09-21 | 2014-03-26 | 比亚迪股份有限公司 | Battery equalization method for battery pack and battery management system |
| CN203759127U (en) * | 2014-02-25 | 2014-08-06 | 中航锂电（洛阳）有限公司 | Device for measuring single-cell battery internal resistance in equalization processes |
| CN104062506A (en) * | 2014-04-29 | 2014-09-24 | 深圳清华大学研究院 | Measuring method and device for ohmic internal resistance of storage battery |
-
2015
- 2015-05-25 CN CN201510270071.8A patent/CN106199431B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201113542A (en) * | 2009-10-06 | 2011-04-16 | shun-chang Zhang | Detection platform for battery performance |
| CN201594116U (en) * | 2009-11-30 | 2010-09-29 | 比亚迪股份有限公司 | Measuring device of battery internal resistance |
| CN103683359A (en) * | 2012-09-21 | 2014-03-26 | 比亚迪股份有限公司 | Battery equalization method for battery pack and battery management system |
| CN103645382A (en) * | 2013-12-13 | 2014-03-19 | 艾德克斯电子（南京）有限公司 | On-line battery internal resistance measuring apparatus and measuring method thereof |
| CN203759127U (en) * | 2014-02-25 | 2014-08-06 | 中航锂电（洛阳）有限公司 | Device for measuring single-cell battery internal resistance in equalization processes |
| CN104062506A (en) * | 2014-04-29 | 2014-09-24 | 深圳清华大学研究院 | Measuring method and device for ohmic internal resistance of storage battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106199431A (en) | 2016-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106199431B (en) | A kind of exchange monitoring method and system based on battery electron module | |
| US9118191B2 (en) | Cell balancing method, cell balancing device, and energy storage system including the cell balancing device | |
| CN105978106B (en) | The equalization charging circuit and its device of series-connected cell | |
| CN102088244B (en) | Maximum power point tracking converter and maximum power point tracking method | |
| EP4068621B1 (en) | Photovoltaic energy storage system and method for detecting ground insulation impedance | |
| CN106872818B (en) | Grid-connected performance testing system and method for light storage combined power generation device | |
| CN106208177B (en) | A kind of battery electron management method and system | |
| CN105576814B (en) | DC power supply standby system | |
| CN102195364A (en) | Impedence balancer | |
| CN103454554A (en) | Polarity tester for current transformer | |
| CN203502540U (en) | Current transformer polarity tester | |
| CN102023267A (en) | High-power detection platform for charger | |
| CN103066671A (en) | Uniform charging method and uniform charging device for lithium battery packs | |
| CN104167783A (en) | Direct-current power source low ripple wave implementation method and circuits with batteries supplying power continuously | |
| KR20100119523A (en) | Inverter system for charging/discharging grid connected using high density secondary cell and operation method therefor | |
| CN103558557B (en) | Power battery pack detection circuit | |
| CN105322575A (en) | Switch cabinet used for power system | |
| CN110518811A (en) | A kind of distribution transformer energy-storage impact power supply | |
| CN105762942B (en) | A kind of battery electron module and energy-storage system | |
| CN103543364A (en) | Wind generating set variable pitch charger detecting platform | |
| Kwak et al. | Comparative Analysis on the Electrical State-of-Health Degradation of 21700 LiNiCoAlO2 based on Alternating and Direct Currents | |
| CN201852894U (en) | Detection platform of high-power charger | |
| CN207573068U (en) | A kind of circuit resistance tester supplies electric installation | |
| Wu et al. | A state-of-charge balance method for distributed energy storage units in microgrid | |
| CN110376529A (en) | Energy-storing multifunctional lithium battery detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: CHINA ENERGY INVESTMENT Corp.,Ltd. Patentee after: Beijing low carbon clean energy research institute Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: SHENHUA GROUP Corp.,Ltd. Patentee before: Beijing low carbon clean energy research institute |
|
| CP03 | Change of name, title or address |