CN106532679B - A method of judging that battery group is reliably connected DC bus - Google Patents
A method of judging that battery group is reliably connected DC bus Download PDFInfo
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- CN106532679B CN106532679B CN201610941504.2A CN201610941504A CN106532679B CN 106532679 B CN106532679 B CN 106532679B CN 201610941504 A CN201610941504 A CN 201610941504A CN 106532679 B CN106532679 B CN 106532679B
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- battery group
- battery
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- current
- voltage
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- 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
Abstract
The invention discloses a kind of methods that judgement battery group is reliably connected DC bus, it is to be connected by fuse (breaker), disconnecting switch with DC bus for direct current system battery group when operating normally, prevents battery from actually detaching the method for discrimination of DC bus；Charger output voltage is adjusted back by lower reconciliation, keep battery group end voltage down or up, measures battery current size and direction, judge battery group whether in electric discharge or charged state, and then judge whether battery group is reliably connected to DC bus, if exist and be detached from DC bus phenomenon.Method of the invention is not in the case where changing original measuring device, DC bus whether can be reliably connected to battery group to judge, effectively prevent being detached from the problems such as causing the danger of DC bus decompression and the life of storage battery to greatly shorten due to DC bus is run because of battery group.
Description
Technical field
The invention belongs to direct current system technical field in electric system, especially a kind of judgement battery group is reliably connected directly
The method for flowing bus prevents battery group to be detached from the technical measures of DC bus.
Background technique
For in electric system direct current system operate normally in due to battery pack open circuit or battery outlet disconnecting link virtual connection lead
It causes battery to actually detach DC bus, when DC charging motor failure or power supply disappearance, DC bus can not be provided
Power supply causes DC bus decompression problem, and electrical secondary equipment is out of service, influences electrical primary equipment safety and stablizes fortune
Row.Battery group is detached from DC bus operation for a long time, and floating bulk charge can not be carried out to battery group, and battery group self discharge stores
The long-term charge less electricity condition of battery, accumulator capacity decline, causes the service life to greatly shorten.
Charger is less than the battery group rated capacity for 0.01 times, people to the floating current of battery group when normal at present
All judge method that battery group is reliably connected DC bus with this floating current size, however floating current very little at this time,
The meter range for measuring electric current is bigger, and usually not in the meter error range of measurement electric current, measurement electric current inaccuracy can not
Reliably judge that battery is reliably connected DC bus, or even causes erroneous judgement.
Therefore, battery group is detached from DC bus in order to prevent, is badly in need of adopting in the case where existing equipment is constant in the market
Ensure to judge that battery group is reliably connected DC bus with a kind of new judgment method, prevents from being detached from bus operation because of battery
And the problem of causing the danger of DC bus decompression and the life of storage battery to greatly shorten.
Summary of the invention
It is an object of the invention to be directed to some shortcomings existing in the prior art, providing a kind of judgement battery group can
Method by connecting DC bus.Method of the invention is to pass through fuse for direct current system battery group when operating normally
(breaker), disconnecting switch are connected with DC bus, prevent battery from actually detaching the method for discrimination of DC bus；It is not
In the case where changing original measuring device, so that it may judge whether battery group is reliably connected DC bus, effectively
It prevents and causes the danger of DC bus decompression and the life of storage battery to greatly shorten because battery group is detached from DC bus operation
Problem occurs.
To achieve the goals above, the invention adopts the following technical scheme:
A method of judging that battery group is reliably connected DC bus, charger output voltage adjusted back by lower reconciliation,
Keep battery group end voltage down or up, measures battery current size and direction, judge whether battery group is discharging
Or charged state, and then judge whether battery group is reliably connected to DC bus, if exist and is detached from DC bus phenomenon；Tool
The step of body are as follows:
Firstly, declining battery group end voltage by lowering charger output voltage, battery current size is measured
And direction, judge battery group whether in discharge condition；It specifically includes:
(1) charger output voltage is lowered
Charger output voltage is controlled by being adjusted to (1-K) * Ue under normal operating voltage Ue, wherein K=0.009~0.035；
Then battery current Ifd is measured；
(2) differentiate whether battery group is in reliable discharge condition
Work as battery current | Ifd | maximum value is not less than 2*C*Ict, and the direction Ifd is negative, then judges battery group
Electric current is discharge current, and battery group is in discharge condition, and preliminary judgement battery group is reliably connected to DC bus, is not present
It is detached from DC bus phenomenon；Conversely, battery group is there may be DC bus phenomenon is detached from, readjustment charger is defeated in next step for progress
Voltage is judged out；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current,
Unit is A；Meanwhile setting battery current and being negative from battery group anode outflow direction, from battery group anode inflow side
To being positive；
Secondly, battery group end voltage rises by readjustment charger output voltage, it is big by measurement battery current
Whether small and direction judges battery group in charged state；It specifically includes:
1. adjusting back charger output voltage
It is normal operating voltage Ue that charger output voltage, which is controlled, by (1-K) * Ue readjustment；Then battery current is measured
I'fd；
2. differentiating whether battery group is in reliable charged state
Work as battery current | I ' fd | maximum value is not less than 2*C*Ict, and the direction I ' fd is positive, then judges battery
Group electric current is charging current, and battery group is in charged state, and battery group is reliably connected to DC bus, straight there is no being detached from
Flow bus phenomenon；Conversely, determining that battery group is not reliably connected to DC bus, exists and be detached from DC bus phenomenon.
In addition, the present invention can also be judged by adjusting back charger transmission voltage again after up-regulation；That is: pass through control
Charger is changed to even charging voltage by float charge voltage and restores float charge voltage, rises or falls battery group end voltage, passes through meter
Calculate machine monitoring systematic survey battery current size and direction, judge battery group whether in charge or discharge state, in turn
Judge whether battery group is reliably connected to DC bus, if exist and be detached from DC bus phenomenon；Specific step are as follows:
Firstly, up-regulation charger output voltage, i.e., be changed to float charge voltage by even charging voltage, battery group end voltage rises,
Battery current size and direction are measured by computer supervisory control system, judges battery group whether in charged state；Specifically
Including
(1) charger output voltage is raised:
Charger output voltage is controlled by being adjusted to (1+K) * Ue on normal operating voltage Ue, wherein K=0.009~0.035；
Then battery current Ifd is detected by computer supervisory control system；
(2) differentiate whether battery group is in reliable charged state
Work as battery current | Ifd | maximum value is not less than 2*C*Ict, and the direction Ifd is positive, then judges battery group
Electric current is charging current, and battery group is in charged state, and preliminary judgement battery group is reliably connected to DC bus, is not present
It is detached from DC bus phenomenon；Conversely, battery group is there may be DC bus phenomenon is detached from, readjustment charger is defeated in next step for progress
Voltage is judged out；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current,
Unit is A；Meanwhile setting battery current and being negative from battery group anode outflow direction, from battery group anode inflow side
To being positive；
Secondly, readjustment charger output voltage, switchs to float charge voltage by even charging voltage, the decline of battery group end voltage is led to
Computer supervisory control system measurement battery current size and direction are crossed, judges battery group whether in charged state；Specific packet
It includes:
1. adjusting back charger output voltage
It is normal operating voltage Ue that charger output voltage, which is controlled, by (1+K) * Ue readjustment；Then pass through computer monitoring system
System detection battery current I ' fd；
2. differentiating whether battery group is in reliable charged state
Work as battery current | I ' fd | maximum value is not less than 2*C*Ict, and the direction I ' fd is negative, then judges battery
Group electric current is discharge current, and battery group is in discharge condition, determines that battery group is reliably connected to DC bus, there is no de-
From DC bus phenomenon；Conversely, determining that battery group is not reliably connected to DC bus, exists and be detached from DC bus phenomenon.
In the present invention, as long as meeting battery charging state and/or discharge condition requirement, judge that battery group can
By being connected to DC bus, there is no be detached from DC bus phenomenon；If battery charging state and discharge condition is not satisfied
It is required that then judging that battery group is not reliably connected to DC bus, exists and be detached from DC bus phenomenon.
Advantages of the present invention:
1. the present invention adjusts back charger output voltage by lower reconciliation, battery group end voltage is adjusted, battery is allowed to distinguish
Electric discharge and charging are primary, in the error range of measurement meter, differentiate that battery group is in electric discharge and charged state really, thus
Judge that battery group is reliably connected to the method for DC bus.This method with high security, high reliablity, high sensitivity, spirit
The advantages that activity is big, simple, there is very big live practical application promotional value.
2. method of the invention does not change the structure and wiring of original equipment, the investment of equipment cost is not increased.
Detailed description of the invention
Fig. 1 is involved DC bus system structural schematic diagram in the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment 1:
As shown in Figure 1, direct current 220V system, one group of charger and a group storage battery group attach to same direct current 220V simultaneously
On bus, charger powers to battery group and DC load with float charge voltage 234V when normal；Battery group capacity is
420Ah.Battery group measurement ammeter is calculated as current divider FL-2/150A/75mV/0.5%.
Firstly, pressing definite value by control charger floating charge, charger output voltage is lowered, is made under the voltage of battery group end
Whether drop measures battery current size and direction, judges battery group in discharge condition；It specifically includes:
(1) charger output voltage is lowered
Control charger output voltage by be adjusted under normal operating voltage Ue=234V (1-K) * Ue=(1-0.009) * 234=
231.9V, wherein K=0.009；Then measurement battery current Ifd is -10.1A；
(2) differentiate whether battery group is in reliable discharge condition
Work as battery current | Ifd | maximum value (for 10.1A) is not less than 2*C*Ict=2*0.005*150=1.5, and
The direction Ifd is negative, then judges battery current for discharge current, battery is in discharge condition；Preliminary conclusion: battery group
It is reliably connected to DC bus, there is no be detached from DC bus phenomenon；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current,
Unit is A；Meanwhile setting battery current and being negative from battery group anode outflow direction, from battery group anode inflow side
To being positive；
Secondly, battery group end voltage rises by readjustment charger output voltage, it is big by measurement battery current
Whether small and direction judges battery group in charged state；It specifically includes:
1. adjusting back charger output voltage
It is normal operating voltage Ue-234V that charger output voltage, which is controlled, by (1-K) * Ue=231.9V readjustment；Then it measures
Battery current I ' fd is+6.1A；
2. differentiating whether battery group is in reliable charged state
Work as battery current | I ' fd | maximum value (for 6.1A) is not less than 2*C*Ict=1.5, and the direction I ' fd is positive,
Judge battery current then for charging current, battery group is in charged state；
Final conclusion: the present embodiment meets battery charging and discharge condition requirement simultaneously, and battery group is reliably connected
To DC bus, there is no be detached from DC bus phenomenon.
Embodiment 2:
Direct current 220V system, one group of charger and a group storage battery group attach on same direct current 220V bus simultaneously, just
Charger powers to battery group and DC load with float charge voltage 234V when often；Battery group capacity is 420Ah；Battery group
Measurement ammeter is calculated as current divider FL-2/150A/75mV/0.5%.
Battery group was filled once in charger regular 90 days, i.e., control charger is automatically changed to bulk charge by float charge voltage
Pressure and automatic recovery float charge voltage are primary.
Firstly, up-regulation charger output voltage, is automatically changed to float charge voltage by even charging voltage, on the voltage of battery group end
It rises, battery current size direction is measured by computer supervisory control system, is judged whether in battery state of charge；Specific packet
It includes:
(1) charger output voltage is raised:
Control charger output voltage by be adjusted on normal operating voltage 234V (1+K) * 234=(1+0.035) * 234=
242.2V；K=0.035；Computer supervisory control system detect battery current Ifd be+10.5A.
(2) differentiate whether battery group is in reliable charged state
Work as battery current | Ifd | maximum value=10.5A is not less than 2*C*Ict=2*0.005*150=1.5, and Ifd
Direction is positive, then judges battery current for charging current, and battery is in charged state, can preliminary judgement battery group
It is reliably connected to DC bus, there is no be detached from direct current；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current,
Unit is A；Meanwhile setting battery current and being negative from battery group anode outflow direction, from battery group anode inflow side
To being positive；
Secondly, readjustment charger output voltage, switchs to float charge voltage by even charging voltage, under the voltage of battery group end automatically
Drop measures battery current size and direction by computer supervisory control system, judges whether in battery state of charge；Specifically
Include:
1. adjusting back charger output voltage
Charger output voltage is controlled by * 234=242.2V of (1+K) * 234=(1+0.035)；The downward of K=0.035 is normal
Working voltage 234V；Measurement battery current Ifd is -9.9A；
2. differentiating whether battery group is in reliable charged state
Work as battery current | I ' fd | maximum value 9.9A is not less than 2*C*Ict=2*0.005*150=1.5, and I ' fd
Direction is negative, then judges battery current for discharge current, battery is in discharge condition；
Final conclusion: the present embodiment meets battery charging and discharge condition requirement simultaneously, and battery group is reliably connected
To DC bus, there is no be detached from direct current phenomenon.
Claims (2)
1. a kind of method that judgement battery group is reliably connected DC bus, it is characterized in that: it is defeated to adjust back charger by lower reconciliation
Voltage out keeps battery group end voltage down or up, measures battery current size and direction, whether judges battery group
In electric discharge or charged state, and then judge whether battery group is reliably connected to DC bus, if there are disengaging DC bus
Phenomenon；Specific step are as follows:
Firstly, declining battery group end voltage by lowering charger output voltage, battery current size and side are measured
To judging battery group whether in discharge condition；It specifically includes:
(1) charger output voltage is lowered
Charger output voltage is controlled by being adjusted to (1-K) * Ue under normal operating voltage Ue, wherein K=0.009~0.035；Then
Measure battery current Ifd；
(2) differentiate whether battery group is in reliable discharge condition
Work as battery current | Ifd | maximum value is not less than 2*C*Ict, and the direction Ifd is negative, then judges battery current
For discharge current, battery group is in discharge condition, and preliminary judgement battery group is reliably connected to DC bus, and there is no be detached from
DC bus phenomenon；Conversely, battery group there may be DC bus phenomenon is detached from, carries out readjustment charger output electricity in next step
Judged again after pressure；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current, unit
For A；Meanwhile setting battery current and being negative from battery group anode outflow direction, it is from battery group anode inflow direction
Just；
Secondly, by readjustment charger output voltage, battery group end voltage rise, by measurement battery current size and
Whether direction judges battery group in charged state；It specifically includes:
1. adjusting back charger output voltage
It is normal operating voltage Ue that charger output voltage, which is controlled, by (1-K) * Ue readjustment；Then battery current I ' is measured
fd；
2. differentiating whether battery group is in reliable charged state
Work as battery current | I ' fd | maximum value is not less than 2*C*Ict, and the direction I ' fd is positive, then judges battery group electricity
Stream is charging current, and battery group is in charged state, determines that battery group is reliably connected to DC bus, straight there is no being detached from
Flow bus phenomenon；Conversely, determining that battery group is not reliably connected to DC bus, exists and be detached from DC bus phenomenon.
2. a kind of method that judgement battery group is reliably connected DC bus, it is characterized in that: by control charger by floating charging
Pressure is changed to even charging voltage and restores float charge voltage, rises or falls battery group end voltage, is surveyed by computer supervisory control system
Battery current size and direction are measured, judges that battery group whether in charge or discharge state, and then judges that battery group is
It is no to be reliably connected to DC bus, if to exist and be detached from DC bus phenomenon；Specific step are as follows:
Firstly, up-regulation charger output voltage, i.e., be changed to even charging voltage by float charge voltage, battery group end voltage rises, passes through
Whether computer supervisory control system measures battery current size and direction, judge battery group in charged state；It specifically includes
(1) charger output voltage is raised:
Charger output voltage is controlled by being adjusted to (1+K) * Ue on normal operating voltage Ue, wherein K=0.009~0.035；Then
Battery current Ifd is detected by computer supervisory control system；
(2) differentiate whether battery group is in reliable charged state
Work as battery current | Ifd | maximum value is not less than 2*C*Ict, and the direction Ifd is positive, then judges battery current
For charging current, battery group is in charged state, and preliminary judgement battery group is reliably connected to DC bus, and there is no be detached from
DC bus phenomenon；Conversely, battery group there may be DC bus phenomenon is detached from, carries out readjustment charger output electricity in next step
Judged again after pressure；
Wherein: C is the meter error amount for measuring battery current, and Ict is the maximum range for measuring battery current, unit
For A；Meanwhile setting battery current and being negative from battery group anode outflow direction, it is from battery group anode inflow direction
Just；
Secondly, readjustment charger output voltage, switchs to float charge voltage by even charging voltage, the decline of battery group end voltage passes through meter
Machine monitoring systematic survey battery current size and direction are calculated, judges battery group whether in discharge condition；It specifically includes:
1. adjusting back charger output voltage
It is normal operating voltage Ue that charger output voltage, which is controlled, by (1+K) * Ue readjustment；Then it is examined by computer supervisory control system
Survey battery current I ' fd；
2. differentiating whether battery group is in reliable discharge condition
Work as battery current | I ' fd | maximum value is not less than 2*C*Ict, and the direction I ' fd is negative, then judges battery group electricity
Stream is discharge current, and battery group is in discharge condition, determines that battery group is reliably connected to DC bus, straight there is no being detached from
Flow bus phenomenon；Conversely, determining that battery group is not reliably connected to DC bus, exists and be detached from DC bus phenomenon.
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| CN107037376B (en) * | 2017-05-28 | 2023-06-30 | 贵州电网有限责任公司电力科学研究院 | Storage battery pack charge-discharge current monitoring system and monitoring method |
| CN109143088B (en) * | 2018-08-02 | 2021-02-23 | 国网山西省电力公司忻州供电公司 | DC storage battery monitoring device |
| CN108957344B (en) * | 2018-08-02 | 2020-11-03 | 国网山西省电力公司忻州供电公司 | DC storage battery on-line monitoring method |
| CN109884535A (en) * | 2019-03-26 | 2019-06-14 | 国网北京市电力公司 | The detection method and device of battery group |
| CN110794342B (en) * | 2019-11-26 | 2021-08-31 | 广东电网有限责任公司东莞供电局 | Monitoring system for separating DC storage battery from bus for station and control method thereof |
| CN111106643A (en) * | 2019-12-20 | 2020-05-05 | 龙滩水电开发有限公司龙滩水力发电厂 | 48V communication power supply system and online discharge control method of storage battery thereof |
| CN111948548A (en) * | 2020-06-23 | 2020-11-17 | 广东电网有限责任公司 | System for detecting storage battery pack without power interruption |
| CN113325321A (en) * | 2021-07-02 | 2021-08-31 | 阳光电源股份有限公司 | Energy storage system floating charge state battery power failure detection method and energy storage system |
| CN115032548B (en) * | 2022-05-25 | 2023-03-21 | 广州汽车集团股份有限公司 | Early warning method and system for automobile storage battery |
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