CN107069922A - A kind of energy storage electrochemical cell charging and discharging currents monitoring system and monitoring method - Google Patents
A kind of energy storage electrochemical cell charging and discharging currents monitoring system and monitoring method Download PDFInfo
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- CN107069922A CN107069922A CN201710393918.0A CN201710393918A CN107069922A CN 107069922 A CN107069922 A CN 107069922A CN 201710393918 A CN201710393918 A CN 201710393918A CN 107069922 A CN107069922 A CN 107069922A
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of energy storage electrochemical cell charging and discharging currents monitoring system and monitoring method, it includes dc bus, generator unit and power supply unit, and generator unit, power supply unit and energy-storage units are interconnected by dc bus；The energy-storage units include energy storage electrochemical cell, energy storage electrochemical cell and are connected with energy storage with electrochemical cell charging and discharging currents monitoring device wire；Energy storage is connected with electrochemical cell charging and discharging currents monitoring device with bidirectional DC/DC converter；When the energy storage for solving prior art carries out discharge and recharge with electrochemical cell, discharge current is larger, but charging current is less, general tens amperes, especially floating current, only several amperes even hundreds of tens milliamperes.Therefore, the required precision that a kind of measuring cell is difficult to meet such Wide measuring range is relied solely on, and single-measurement component reliability is poor is difficult to meet the technical problems such as the requirement to the real-time monitoring of charging and discharging currents such as wind power plant, photovoltaic plant.
Description
Technical field
The invention belongs to energy storage electrochemical cell charging and discharging currents monitoring technology, more particularly to a kind of energy storage electrochemistry
Battery charging and discharging current monitoring system and monitoring method.
Background technology
In recent years, due to the severe contamination problem of global energy crisis and conventional fossil fuel to environment, cleaning, can
The renewable sources of energy receive much concern.And the new energy such as solar energy, wind energy there is intermittence in itself, it is fluctuation, unpredictable.Cause
This, will efficiently utilize new energy, and energy storage device is essential.No matter new energy is more than needed or short, and energy storage device can be transferred through
The mode of discharge and recharge stores or discharged electric energy to meet the need for electricity of user.
In recent years, energy storage technology is used widely in fields such as the energy, traffic, electric power, telecommunications.In different applied fields
Close, the stored energy form of use is also different, and energy storage device can be electric energy in forms such as chemical energy, potential energy, kinetic energy, electromagnetic energy
Store, especially electrochemical cell is discharged in the form of electric energy again when load needs, carry act foot light
The effect of weight.Its life-span often than life expectancy much shorter, usually premature failure and can not be continuing with.Dead battery is ground
Study carefully discovery, charge-discharge control system has a significant impact to battery life.To the big of the charging and discharging currents of energy storage electrochemical cell
The monitoring and analysis of small and variation tendency, can provide important letter for online evaluation energy storage with the health status of electrochemical cell
Breath.
In existing measuring cell, shunt resistance or the current transformer based on hall principle are used charging and discharging currents more
（Abbreviation Hall sensor）Measure, but both measuring cells respectively have advantage and disadvantage.Shunt resistance measurement accuracy is high, but its work
When making and load in series, it is impossible to carry out isolation measurement, and the electric current heating always flowed through, especially by larger current
When, the power of tested power supply can be consumed, its measured value can be a greater impact.And with circuit-under-test electricity does not occur for Hall sensor
Contact, does not influence circuit-under-test, the power of tested power supply is not consumed, be suitable for the measurement of high current, but when electric current is smaller, then
Show that sensitivity is inadequate, stability is poor, the problems such as poor anti jamming capability.
When energy storage carries out discharge and recharge with electrochemical cell, there is discharge current and charging current, wherein discharge current is larger,
About tens amperes, or even up to hundreds of amperes, but charging current is less, general tens amperes, especially floating current, only
Several amperes even hundreds of tens milliamperes.Therefore, the precision that a kind of measuring cell is difficult to meet such Wide measuring range is relied solely on
It is required that, and single-measurement component reliability is poor is difficult to meet wind power plant, photovoltaic plant etc. to the real-time monitoring of charging and discharging currents
Requirement.
The content of the invention：
The technical problem to be solved in the present invention：A kind of energy storage electrochemical cell charging and discharging currents monitoring system and monitoring side are provided
, when the energy storage to solve prior art carries out discharge and recharge with electrochemical cell, there is discharge current and charging current, wherein putting in method
Electric current is larger, about tens amperes, or even up to hundreds of amperes, but charging current is less, general tens amperes, especially floats
Charging stream, only several amperes even hundreds of tens milliamperes.Therefore, rely solely on a kind of measuring cell and be difficult to meet so wide measurement
The required precision of scope, and single-measurement component reliability is poor is difficult to meet wind power plant, photovoltaic plant etc. to discharge and recharge electricity
The technical problems such as the requirement that stream is monitored in real time.
Technical solution of the present invention：
A kind of energy storage electrochemical cell charging and discharging currents monitoring system, it includes dc bus, generator unit and power supply unit,
Generator unit, power supply unit and energy-storage units are interconnected by dc bus；The energy-storage units include energy storage electrochemistry
Battery, energy storage electrochemical cell are connected with energy storage with electrochemical cell charging and discharging currents monitoring device wire；Energy storage electrification
Battery charging and discharging current monitoring device is learned to be connected with bidirectional DC/DC converter.
The DC terminal of bidirectional DC/DC converter and first direct current of the energy storage with electrochemical cell charging and discharging currents monitoring device
End connection；Energy storage the second DC terminal of electrochemical cell charging and discharging currents monitoring device and the direct current of energy storage electrochemical cell
End connection；Bidirectional DC/DC converter passes through Ethernet with energy storage with the communication interface of electrochemical cell charging and discharging currents monitoring device
Or RS485 connections.
The DC terminal of bidirectional DC/DC converter and first direct current of the energy storage with electrochemical cell charging and discharging currents monitoring device
The first dc circuit breaker is in series between end；Second DC terminal and storage of the energy storage with electrochemical cell charging and discharging currents monitoring device
Can be with being in series with the second dc circuit breaker between the DC terminal of electrochemical cell.
Energy storage electrochemical cell charging and discharging currents monitoring device includes DSP Processor, first switch and shunting electricity
The series connection of resistance device, second switch be connected in parallel again after connect with Hall sensor the first DC terminal and the second DC terminal positive pole it
Between；The digital output end of DSP Processor is connected with the control end of first switch and second switch；It is integrated with DSP Processor
Communication interface.
A kind of monitoring method of described energy storage electrochemical cell charging and discharging currents monitoring system, it includes：
Step 1, the second switch closure by energy storage electrochemical cell charging and discharging currents monitoring device；
Step 2, the second dc circuit breaker is first closed, then close the first dc circuit breaker, by energy storage electrochemical cell discharge and recharge
Current monitoring device puts into operation；
Step 3, energy storage automatically control first switch and with electrochemical cell charging and discharging currents monitoring device according to control logic
Charging and discharging currents are carried out automatic detection by the disconnection of two switches and closure；
Step 4, energy storage with electrochemical cell charging and discharging currents monitoring device will detect electric current sent in real time by communication interface to
Bidirectional DC/DC converter.
Control logic includes described in step 3：
Logic 1, in charging, second switch is in closure state, and first switch is off；When energy storage electrification
Battery is learned by when charging switchs to floating charge, bidirectional DC/DC converter sends information to energy storage electrification by communication interface
Battery charging and discharging current monitoring device is learned, energy storage first closes first switch with electrochemical cell charging and discharging currents monitoring device, prolonged
When t1 after disconnect second switch, realize the measurement to low current l1；T1 values are 0.01-1 seconds；
When logic 2, charging current are more than device setting definite value switching threshold Ix, second switch is in closure state, first switch
It is off；When detecting charging current less than device setting definite value switching threshold Ix, energy storage is filled with electrochemical cell
Discharge current monitoring device first closes first switch, then the t2 that is delayed disconnects second switch, realizes the measurement to low current I1；Device
Definite value switching threshold Ix is set to be located between I1 and I2；T2 values are 0.01-1 seconds；
When logic 3, charging current are less than device setting definite value switching threshold Ix, first switch is in closure state, second switch
It is off；When detecting charging current less than device setting definite value switching threshold Ix, energy storage is filled with electrochemical cell
Discharge current monitoring device disconnects first switch after first closing second switch, delay t3, realizes the measurement to low current I1；Device
Definite value switching threshold Ix is set to be located between I1 and I2；Time t3 value is 0.01-1 seconds；
Logic 4, bidirectional DC/DC converter detect inlet wire DC voltage dead electricity or the energy storage electricity consumption of dc bus and generator unit
When interconnection switch between chemical cell and bidirectional DC/DC converter disconnects, it is judged as that energy storage loses charging electricity with electrochemical cell
Source, in discharge condition, energy storage electrochemical cell charging and discharging currents monitoring device judges closing for first switch and second switch
The state closed and disconnected, when first switch and second switch are respectively at disconnection and closure state, energy storage electrochemical cell
Charging and discharging currents monitoring device is failure to actuate；When first switch and second switch are respectively at closed and disconnected state, energy storage is used
Electrochemical cell charging and discharging currents monitoring device, which is first closed, disconnects first switch after second switch, then the t4 that is delayed, realize to big electricity
Flow I2 measurement；Time t4 value is 0.01-1 seconds.
Beneficial effects of the present invention：
The present invention is utilized respectively shunt resistance device and the advantage of Hall sensor, under conditions of high current and low current, passes through
The switching of shunt resistance device and Hall sensor is realized to high current and the high-acruracy survey of low current, solves prior art
When energy storage carries out discharge and recharge with electrochemical cell, there is discharge current and charging current, wherein discharge current is larger, about tens peaces
Training, or even up to hundreds of amperes, but charging current is less, general tens amperes, especially floating current, only several amperes very
To hundreds of tens milliamperes.Therefore, the required precision that a kind of measuring cell is difficult to meet such Wide measuring range is relied solely on, and
Single-measurement component reliability is poor to be difficult to meet the skills such as the requirement to the real-time monitoring of charging and discharging currents such as wind power plant, photovoltaic plant
Art problem.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is bidirectional DC/DC converter of the present invention and energy storage electrochemical cell charging and discharging currents monitoring device and energy storage electrification
Learn battery connecting construction schematic diagram；
Fig. 3 is batteries charging and discharging currents monitoring device composition schematic diagram of the present invention.
Embodiment
A kind of energy storage electrochemical cell charging and discharging currents monitoring system, it includes dc bus, generator unit and power supply
Unit, generator unit, power supply unit and energy-storage units are interconnected by dc bus；The energy-storage units include energy storage electricity consumption
Chemical cell, energy storage electrochemical cell are connected with energy storage with electrochemical cell charging and discharging currents monitoring device wire；Energy storage is used
Electrochemical cell charging and discharging currents monitoring device is connected with bidirectional DC/DC converter.
Generator unit includes electricity generation module, MPPT maximal power tracings module and the DC/DC boost modules such as wind-powered electricity generation, photovoltaic.
DC voltage for electricity generation module to be received to the exportable changes such as wind-powered electricity generation, photovoltaic；Maximal power tracing module can ensure photovoltaic
Electricity generation module is operated near maximum power point；DC/DC boost modules change the DC voltage of change to dc bus.It connects
The relation of connecing is：The electricity generation modules such as wind-powered electricity generation, photovoltaic are connected with MPPT maximal power tracing modules, MPPT maximal power tracings module with
DC/DC boost modules are connected, and DC/DC boost modules are connected with dc bus.
Wherein, power supply unit includes load, transformer, DC/AC inverters.By direct current through inversion under normal operation
Output voltage is supplied to AC load after device conversion.Its annexation is：Load is connected with transformer, and transformer is inverse with DC/AC
Become device connection.DC/AC inverters are connected with dc bus.
The DC terminal of bidirectional DC/DC converter and first direct current of the energy storage with electrochemical cell charging and discharging currents monitoring device
End connection；Energy storage the second DC terminal of electrochemical cell charging and discharging currents monitoring device and the direct current of energy storage electrochemical cell
End connection；Bidirectional DC/DC converter passes through Ethernet with energy storage with the communication interface of electrochemical cell charging and discharging currents monitoring device
Or RS485 connections.
The DC terminal of bidirectional DC/DC converter and first direct current of the energy storage with electrochemical cell charging and discharging currents monitoring device
The first dc circuit breaker is in series between end；Second DC terminal and storage of the energy storage with electrochemical cell charging and discharging currents monitoring device
Can be with being in series with the second dc circuit breaker between the DC terminal of electrochemical cell.
Energy storage electrochemical cell charging and discharging currents monitoring device includes DSP Processor, first switch and shunting electricity
The series connection of resistance device, second switch be connected in parallel again after connect with Hall sensor the first DC terminal and the second DC terminal positive pole it
Between；The digital output end of DSP Processor is connected with the control end of first switch and second switch；It is integrated with DSP Processor
Communication interface.DSP Processor, which is used to realize, to be calculated and logic judging function.
The energy storage that the energy storage of the present invention is collected with electrochemical cell charging and discharging currents monitoring device is filled with electrochemical cell
Discharge current sampled value is sent to bidirectional DC/DC converter by communication interface, and bidirectional DC/DC converter passes through RS485 or ether
Net is sent to the monitoring systems such as wind power plant, photovoltaic plant, to realize the real-time prison to energy storage electrochemical cell charging and discharging currents
Survey；Realize and the real-time high-precision of the charging and discharging currents of energy storage electrochemical cell is monitored.
A kind of monitoring method of described energy storage electrochemical cell charging and discharging currents monitoring system, it includes：
Step 1, energy storage with electrochemical cell charging and discharging currents monitoring device is subjected to parameter tuning and setting, it is contemplated that energy storage is used
Electrochemical cell charging and discharging currents monitoring device is in installation process, and energy storage is in discharge condition with electrochemical cell, and access is double
Charged state is filled to can be directly transferred to during dcdc converter commencement of commercial operation, in original state, second switch is in closure
State.
Step 2, the second dc circuit breaker is first closed, then close the first dc circuit breaker, energy storage is filled with electrochemical cell
Discharge current monitoring device puts into operation；
Step 3, energy storage automatically control first switch and with electrochemical cell charging and discharging currents monitoring device according to control logic
Charging and discharging currents are carried out automatic detection by the disconnection of two switches and closure；
Step 4, energy storage with electrochemical cell charging and discharging currents monitoring device will detect electric current sent in real time by communication interface to
Bidirectional DC/DC converter.
Control logic includes described in step 3：
Logic 1, in charging, second switch is in closure state, and first switch is off.When energy storage electrification
Battery is learned by when charging switchs to floating charge, bidirectional DC/DC converter sends information to energy storage electrification by communication interface
Battery charging and discharging current monitoring device is learned, in order to prevent that survey in short-term is caused in the handoff procedure of first switch and second switch
Amount is interrupted, therefore energy storage first closes first switch with electrochemical cell charging and discharging currents monitoring device, and second is disconnected after the t1 that is delayed
Switch, to realize the measurement to low current l1.
Wherein time t1 can value be 0.01-1 seconds between,
Logic 2：When charging current is more than device setting definite value switching threshold Ix, second switch is in closure state, first switch
It is off.And when detecting charging current less than device setting definite value switching threshold Ix, energy storage electrochemical cell
Charging and discharging currents monitoring device first closes first switch, then the t2 that is delayed disconnects second switch, realizes the measurement to low current I1；Dress
Definite value switching threshold Ix is installed to be located between I1 and I2；
Wherein time t2 can value be 0.01-1 seconds between,
When logic 3, charging current are less than device setting definite value switching threshold Ix, first switch is in closure state, second switch
It is off.And when detecting charging current less than device setting definite value switching threshold Ix, in order to prevent opening first
Close and cause measurement in short-term to interrupt in the handoff procedure with second switch, energy storage electrochemical cell charging and discharging currents monitoring device
First switch is disconnected after first closing second switch, delay t3, the measurement to low current I1 is realized；Device sets definite value switching threshold
Ix is located between I1 and I2；
Wherein time t3 can value be 0.01-1 seconds between.
Logic 4, bidirectional DC/DC converter detect dc bus and the inlet wire DC voltage dead electricity of generator unit or energy storage
When being disconnected with the interconnection switch between electrochemical cell and bidirectional DC/DC converter, judge that it is lost for energy storage with electrochemical cell and fill
Power supply, in discharge condition, energy storage judges first switch and second switch with electrochemical cell charging and discharging currents monitoring device
Closed and disconnected state, when first switch and second switch are respectively at disconnection and closure state, energy storage electrochemistry
Battery charging and discharging current monitoring device is failure to actuate；But when first switch and second switch are respectively at closed and disconnected state,
In order to prevent from causing measurement in short-term to interrupt in the handoff procedure of first switch and second switch, energy storage is filled with electrochemical cell
Discharge current monitoring device, which is first closed, disconnects first switch after second switch, then the t4 that is delayed, realize the measurement to high current I2.
Wherein time t4 can value be 0.01-1 seconds between.
Claims (9)
1. a kind of energy storage electrochemical cell charging and discharging currents monitoring system, it includes dc bus, and generator unit and power supply are single
Member, it is characterised in that：Generator unit, power supply unit and energy-storage units are interconnected by dc bus；The energy-storage units bag
Energy storage electrochemical cell, energy storage electrochemical cell and energy storage electrochemical cell charging and discharging currents monitoring device wire is included to connect
Connect；Energy storage is connected with electrochemical cell charging and discharging currents monitoring device with bidirectional DC/DC converter.
2. a kind of energy storage according to claim 1 electrochemical cell charging and discharging currents monitoring system, it is characterised in that：It is double
It is connected to the DC terminal of dcdc converter with energy storage with the first DC terminal of electrochemical cell charging and discharging currents monitoring device；Energy storage
It is connected with the second DC terminal of electrochemical cell charging and discharging currents monitoring device with energy storage with the DC terminal of electrochemical cell；It is two-way
Dcdc converter is connected with energy storage with the communication interface of electrochemical cell charging and discharging currents monitoring device by Ethernet or RS485
Connect.
3. a kind of energy storage according to claim 2 electrochemical cell charging and discharging currents monitoring system, it is characterised in that：It is double
Connected to the DC terminal of dcdc converter with energy storage between the first DC terminal of electrochemical cell charging and discharging currents monitoring device
There is the first dc circuit breaker；Energy storage is with the second DC terminal of electrochemical cell charging and discharging currents monitoring device and energy storage electrochemistry
The second dc circuit breaker is in series between the DC terminal of battery.
4. a kind of energy storage according to claim 1 electrochemical cell charging and discharging currents monitoring system, it is characterised in that：Institute
Energy storage electrochemical cell charging and discharging currents monitoring device is stated including DSP Processor, first switch connects with shunt resistance device, the
Two switches are connected in parallel between the positive pole of the first DC terminal and the second DC terminal again after being connected with Hall sensor；DSP processing
The digital output end of device is connected with the control end of first switch and second switch；Communication interface is integrated with DSP Processor.
5. a kind of monitoring method of energy storage electrochemical cell charging and discharging currents monitoring system as claimed in claim 1, it is wrapped
Include：
Step 1, the second switch closure by energy storage electrochemical cell charging and discharging currents monitoring device；
Step 2, the second dc circuit breaker is first closed, then close the first dc circuit breaker, by energy storage electrochemical cell discharge and recharge
Current monitoring device puts into operation；
Step 3, energy storage automatically control first switch and with electrochemical cell charging and discharging currents monitoring device according to control logic
Charging and discharging currents are carried out automatic detection by the disconnection of two switches and closure；
Step 4, energy storage with electrochemical cell charging and discharging currents monitoring device will detect electric current sent in real time by communication interface to
Bidirectional DC/DC converter.
6. a kind of monitoring method of energy storage electrochemical cell charging and discharging currents monitoring system according to claim 5, its
It is characterised by：Control logic includes described in step 3：
Logic 1, in charging, second switch is in closure state, and first switch is off；When energy storage electrification
Battery is learned by when charging switchs to floating charge, bidirectional DC/DC converter sends information to energy storage electrification by communication interface
Battery charging and discharging current monitoring device is learned, energy storage first closes first switch with electrochemical cell charging and discharging currents monitoring device, prolonged
When t1 after disconnect second switch, realize the measurement to low current l1；T1 values are 0.01-1 seconds.
7. a kind of monitoring method of energy storage electrochemical cell charging and discharging currents monitoring system according to claim 5, its
It is characterised by：Control logic includes described in step 3：
When logic 2, charging current are more than device setting definite value switching threshold Ix, second switch is in closure state, first switch
It is off；When detecting charging current less than device setting definite value switching threshold Ix, energy storage is filled with electrochemical cell
Discharge current monitoring device first closes first switch, then the t2 that is delayed disconnects second switch, realizes the measurement to low current I1；Device
Definite value switching threshold Ix is set to be located between I1 and I2；T2 values are 0.01-1 seconds.
8. a kind of monitoring method of energy storage electrochemical cell charging and discharging currents monitoring system according to claim 5, its
It is characterised by：Control logic includes described in step 3：
When logic 3, charging current are less than device setting definite value switching threshold Ix, first switch is in closure state, second switch
It is off；When detecting charging current less than device setting definite value switching threshold Ix, energy storage is filled with electrochemical cell
Discharge current monitoring device disconnects first switch after first closing second switch, delay t3, realizes the measurement to low current I1；Device
Definite value switching threshold Ix is set to be located between I1 and I2；Time t3 value is 0.01-1 seconds.
9. a kind of monitoring method of energy storage electrochemical cell charging and discharging currents monitoring system according to claim 5, its
It is characterised by：Control logic includes described in step 3：
Logic 4, bidirectional DC/DC converter detect inlet wire DC voltage dead electricity or the energy storage electricity consumption of dc bus and generator unit
When interconnection switch between chemical cell and bidirectional DC/DC converter disconnects, it is judged as that energy storage loses charging electricity with electrochemical cell
Source, in discharge condition, energy storage electrochemical cell charging and discharging currents monitoring device judges closing for first switch and second switch
The state closed and disconnected, when first switch and second switch are respectively at disconnection and closure state, energy storage electrochemical cell
Charging and discharging currents monitoring device is failure to actuate；When first switch and second switch are respectively at closed and disconnected state, energy storage is used
Electrochemical cell charging and discharging currents monitoring device, which is first closed, disconnects first switch after second switch, then the t4 that is delayed, realize to big electricity
Flow I2 measurement；Time t4 value is 0.01-1 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975590A (en) * | 2019-05-13 | 2019-07-05 | 江苏原容新能源科技有限公司 | Current measurement circuit based on Hall chip and shunt resistance |
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| CN107069922B (en) | 2023-08-25 |
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