CN106646037B - A kind of direct current system real-time detection method for substation - Google Patents
A kind of direct current system real-time detection method for substation Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000007667 floating Methods 0.000 claims abstract description 15
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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
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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]
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Abstract
The invention discloses a kind of direct current system real-time detection methods for substation, comprising the following steps: battery is run in a manner of floating charging；Control reduces charging voltage with detection unit, and starting self-test interrupts system；Control and detection unit detect battery, and control the on-off of battery discharge loop；The charging voltage of battery is increased, battery enters equalizaing charge.Present invention enhances itself real-time detection of battery, enhances and contacted with direct current system；Battery autonomous test pattern can under normal floating charging working condition automatic real-time detection battery superiority and inferiority, and can by ammeter whether have reading verifying DC loop integrality.It is securely and reliably, time saving and energy saving compared to more existing storage battery checking charge and discharge test.Extend the service life of battery.
Description
Technical field
The present invention relates to substation safety control technology fields, more particularly to a kind of direct current for substation
System real-time detection method.
Background technique
Direct current system is not only that the offers such as substation relay protection, automatic device, control, signal and emergency lighting are reliable
DC power supply, but also reliable operation power is provided for daily grid switching operation.Its reliably whether directly to the safety of substation
Operation plays a crucial role.
When the whole station decompression of substation, charger stops working, battery group as substation safety run it is last together
Barrier, it is very big that can it provide reliable DC power supply meaning for substation, in recent years, occurred a lot of because of substation's electric power storage
Pond failure and he causes the accidents such as the power failure of whole transformer station whole station, equipment burnout.Therefore, battery is carried out reliable in real time online
Monitoring is significant to whole transformer station even power grid.
Lead-acid accumulator has had more than 150 years history since 1859 by Pulan spy's invention so far, and technology ten is divided into
It is ripe, it is most popular electrochmical power source on the whole world.Although nickel-cadmium cell, nickel-metal hydride battery, lithium ion battery etc. are novel in recent years
Battery is come out one after another and is applied, but lead-acid accumulator still relies on that heavy-current discharge performance is strong, voltage characteristic is steady, temperature
It is applied widely, cell capacity is big, highly-safe and abundant raw materials and reproducible utilization, cheap etc. are a series of excellent
Gesture, in the power system in occupation of absolute leading position.Valve controlled sealed lead-acid accumulator is stablized by performance, and operation can
It leans on, the advantages that maintenance workload is small, long service life, the short several years is just almost instead of all changes since the 1990s
The Traditional DC equipment in power station.
Battery group technique manufactures, service life and daily maintenance it is improper etc. due to, be likely to result in battery electricity
Situations such as evaporation of solution liquid, internal resistance are become larger with capacity reduction, if cannot find and handle in time, it is possible to will cause battery and exist
Electric power system fault can not provide reliable DC power supply when occurring, and automatic device can not be cooperated quickly to cut off failure so that causing
The serious consequences such as equipment damage.Therefore verification property charge and discharge test must be periodically carried out to it, it is ensured that the capacity of battery group is full
The requirement of sufficient operation of power networks." new installation battery group should carry out full capacity verification property and fill " transforming plant DC operating standard " regulation
Discharge test, capacity reach 100%；Primary verification property charge and discharge test is every two years carried out later.Operation 4 years after every year into
The primary verification property charge and discharge test of row, capacity need to reach 80% or more ".
Full checking discharging test can carry out comprehensive, careful inspection to battery group, but need during testing
Battery group is exited into direct current system.Therefore, it can be adopted when substation is configured with two sets of valve controlled sealed lead-acid accumulator groups
With, when substation only has a group storage battery, in order to ensure direct current system operation it is safe and reliable, this battery group can not move back
Direct current system is run out, can not make full checking discharging test, can only be after charger deactivates, from battery group to direct current
Load and discharge resistance power supply, make the checking discharging test of 30%~50% rated capacity.In this case, due to having incited somebody to action
Charger logs off, when short trouble occurs for substation, if accumulator capacity is insufficient, internal break etc. is all likely to result in
The major accidents such as the entire direct current system power loss of substation, relay fail.Therefore, this test method is to testing crew professional standards
It is required that it is high, it to be tested during the test in strict accordance with defined method, otherwise very likely because of the behaviour of testing crew
Make that method is improper to cause whole streaming system deperssurization emergency of standing erectly.
The terminal voltage value of battery group, floating current are mainly monitored in the operation of traditional valve-control sealed accumulator group
Value, the voltage value of every battery, battery group and DC bus to ground resistance and state of insulation etc..It is as shown in Figure 1 single
The direct current system of bus wiring, under normal operation, K1, K2 are closing positions, when needing to do verification property charge and discharge test,
K1 is disconnected, K3 is connected, restores after test.The operation of entire direct current system is risen the position of this three groups of disconnecting links of K1, K2 and K3
Decisive role, but this three groups of disconnecting links usually despise general idea, auxiliary contact by substation's operation maintenance personnel and service personnel
Position signal is also sent to monitoring backstage not over communication interface and dispatches, this becomes unified blind area of monitoring of power train, to change
Electric station DC system stable operation buries deep hidden danger.In August, 2016, in the 330kV transformer station direct current system of Xi'an due to
The disconnecting link (K2 disconnecting link as shown in figure 1) that battery is connected to the small bus of direct current fails by the correct investment of regulation, in substation's short circuit event
In the case of barrier, charging unit stops working, direct current system power loss, and relay fail eventually leads to transforming plant main transformer and burns.Therefore,
Real-time online reinforces " health " control of storage batteries of transformer substation and is very important with the integrality of direct current system.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that disclosing a kind of for becoming
The direct current system real-time detection method in power station solves the problems, such as to monitor difficulty in operation electric energy metering device management.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of direct current system real-time detection method for substation, which comprises the following steps:
Battery is run in a manner of floating charging；
Start autonomous test pattern, reduces charger charging voltage；
Whether reversed detect battery output ammeter power flow direction；
If it is reversed, then connect battery discharge loop disconnecting link and carry out constant-current discharge；When single battery difference in voltage
When less than setting voltage value, battery discharge loop disconnecting link is disconnected, battery voltage is increased；Otherwise output accumulator internal resistance is abnormal
Alarm signal, be then turned off battery discharge loop disconnecting link；If not reversed, then the alarm signal of output loop exception,
Disconnect battery discharge loop disconnecting link；
The charging voltage of battery is increased, battery enters equalizaing charge.
Further, the starting autonomous test pattern reduces charger charging voltage；Specifically, carrying out equalizaing charge
Preceding 5min starting self-test interrupts system, detects to battery, charging voltage is reduced to the 90% of voltage rating at this time.
Further, the battery discharge loop disconnecting link of connecting carries out the discharge time of constant-current discharge as 3min.
Further, the voltage difference set is 0.4V.
Further, the charging voltage for increasing battery, battery enter equalizaing charge, specifically: increase electric power storage
The charging voltage in pond reaches voltage rating 100%.
It further, further include battery cutout being detected by cutout detection device, when the cutout detection device passes through
Between element, setting time locking, electric current is zero to be reliably failure to actuate when having not timed out up to setting value, when reaching setting value, by sentencing
Other element, which starts to monitoring backstage and remote dispatching, sends alarm command.
Further, the float charge voltage is 2.23~2.28V/ monomer.
Preferably, the float charge voltage is selected as 2.25V/ monomer.
Further, the equalizaing charge voltage is 2.3~2.4V/ monomer.
Preferably, the equalizaing charge voltage selects 2.35V/ monomer.
Compared with the prior art, the present invention has the following advantages:
Present invention enhances itself real-time detection of battery, enhances and contacted with direct current system.Battery self-test
Mode can under normal floating charging working condition automatic real-time detection battery superiority and inferiority, and whether can have by ammeter
The integrality of reading verifying DC loop.It is securely and reliably, time saving and energy saving compared to more existing storage battery checking charge and discharge test.
And the battery self-test period matches with equalizaing charge, has filled with putting, discharges accumulator capacity to the greatest extent,
Extend the service life of battery；Battery cutout detection can effectively detect the connection of battery group and direct current system in real time
System, when battery group because when any reason is detached from direct current system, substation person on duty or scheduling can be at the first time
Receive alarm signal, it is ensured that failure can be handled reliably in time.
Detailed description of the invention
Fig. 1 is the existing direct current system detection structure figure that the present invention mentions；
Fig. 2 is a kind of direct current system real-time detection method flow chart for substation proposed by the present invention；
Fig. 3 is method specific flow chart described in Fig. 2；
Fig. 4 is the group storage battery group internal resistance isoboles in the embodiment of the present invention；
Fig. 5 is battery proposed by the present invention cutout detection circuit figure.
Specific embodiment
The specific embodiment of the invention is described with reference to the accompanying drawings and embodiments:
It is a kind of direct current system real-time detection method process for substation proposed by the present invention referring to Fig. 1 to Fig. 3
Figure.
As shown in Figure 1 to Figure 3, a kind of direct current system real-time detection method for substation, which is characterized in that including with
Lower step:
Battery is run in a manner of floating charging；
Start autonomous test pattern, reduces charger charging voltage；
Whether reversed detect battery output ammeter power flow direction；
If it is reversed, then connect battery discharge loop disconnecting link and carry out constant-current discharge；When single battery difference in voltage
When less than setting voltage value, battery discharge loop disconnecting link is disconnected, battery voltage is increased；Otherwise output accumulator internal resistance is abnormal
Alarm signal, be then turned off battery discharge loop disconnecting link；If not reversed, then the alarm signal of output loop exception,
Disconnect battery discharge loop disconnecting link；
The charging voltage of battery is increased, battery enters equalizaing charge.
A kind of direct current system real-time detection method for substation provided by the invention, by increasing in direct current system
Control and detection unit, detect the state of battery in the direct current system of substation, can be with by remote communication interface
The real-time Transmission for carrying out data, when operating normally, battery is run in a manner of floating charging, and float charge voltage general control is 2.23
~2.28V/ monomer, float charge voltage is excessively high, it is too low can all cause accumulator plate vulcanization, active material to loosen, to make electric power storage
Tankage becomes smaller, and shortens battery life, at 25 DEG C, is traditionally arranged to be 2.25V/ monomer.Since battery is in use process
The middle non-uniform phenomenon that can be generated generally carries out equalizaing charge in the range of making it be restored to regulation at quarterly intervals, balanced
Charging voltage general control usually takes 2.35V/ monomer at 25 DEG C in 2.3~2.4V/ monomer, real by setting direct current system
When detection method, the switching that battery carries out equalizaing charge can be automatically controlled, do not need human intervention, guaranteed in direct current system
The normal operation of battery improves the reliability of power supply system.
Further, the starting autonomous test pattern reduces charger charging voltage；Specifically, carrying out equalizaing charge
Preceding 5min starting self-test interrupts system, detects to battery, charging voltage is reduced to the 90% of voltage rating at this time.
When the normal floating charging of battery group, since floating charging electric current is smaller, the voltage phase difference of each cell batteries is not
Very big, when battery large current charge, electric discharge, according to Kirchhoff's current law (KCL), the biggish battery partial pressure of internal resistance is larger,
Therefore, battery can accurately be monitored by comparing the voltage of each cell batteries of battery group under heavy-current discharge mode
Operating condition.
The internal resistance isoboles of a group storage battery group are illustrated in figure 4, E is the electromotive force of cell batteries, and Zeq is equivalent list
Resistance in vivo.It is equal that it can be approximately considered each cell batteries electromotive force under normal circumstances, it may be assumed that
E1=E2=...=En
Accumulator internal resistance is under normal circumstances all in mΩGrade, therefore each accumulator internal resistance partial pressure is smaller, can be approximately considered:
U1=U2=...=Un
When a cell batteries Ei internal resistance Zeqi is bigger than normal in battery group, in the electric discharge of battery group, due to Kiel
Hough effect, partial pressure is larger, then:
U1=U2=...=Un > Ui
Therefore battery group, i.e. differential pressure measurement can be monitored by the way that whether the voltage difference of different batteries is greater than the set value
Method:
|Ui-Uj|>Uset(i∈{1,2,…n},j∈{1,2,…n})
When substation only has a group storage battery, if happening suddenly substation's short circuit and battery when doing checking discharging test
Failure will cause direct current system power loss.Direct current system real-time detection method provided by the invention can be used to remedy such and insufficient,
The automatic detection of battery is realized with safer, simple method.
In the embodiment of the present invention, control and detection unit detect battery, and control battery discharge loop
On-off；Further include: whether detection single battery voltage is less than setting value, if being less than setting value, disconnects electric power storage tank discharge and returns
Otherwise road issues accumulator internal resistance abnormality alarming signal.
Under normal floating charge mode, charger provides stable DC source for DC bus and battery, remains entire and becomes
The normal DC load in power station and the self discharge inside battery group.Battery is connected to the electric current meter reading of DC bus to store
The normal self-discharge current of battery, battery is directed toward by DC bus in direction.Charging voltage by reducing charger makes electric power storage
Pond is in discharge condition, and according to the requirement of direct current system technical regulation, DC bus-bar voltage cannot be below 90%UN, therefore, if
Determining charger voltage is 90% DC rated voltage, to ensure direct current system stable operation.Then pass through high precision electro flow table
Power flow direction ensures that battery is in discharge condition, then connects the discharge loop disconnecting link K3 of battery, is put by automatic adjustment
Resistance makes battery be in " constant-current discharge " state.To set the electric current of constant-current discharge as battery convenient for calculating and analyzing
The nominal discharge current of group, the nominal discharge current automatically adjust discharge resistance by device and realize, carry out constant-current discharge 3 and divide
Clock, then by leakage measurement method using differential pressure transducer, i.e., according to the end voltage of cell batteries each under storage battery constant-current discharge, when battery group
When voltage difference is greater than 0.4V between monomer, i.e., to backstage and scheduling hair alarm signal.Or it is monitored by direct current method or alternating current method
The internal resistance of battery at this time, when battery is fully charged and complete electric discharge, internal resistance differs 2-4 times or so.With discharge process
Progress, internal resistance incrementally increases, and the internal resistance of battery is in m under normal circumstancesΩGrade, when accumulator capacity deficiency, internal resistance can significantly
Increase, is even up to sometimesΩGrade, therefore can determine whether accumulator capacity meets the requirements by detecting internal resistance；When there is monomer
It when accumulator internal resistance is greater than the set value, that is, can determine whether that this battery group capacity is unsatisfactory for requiring, need to carry out this battery group
Maintenance and Repair or replacement.
Under normal circumstances, the chemical reaction such as redox can occur for two electrodes of battery, its meeting battery consumption
Active material reduces the energy of battery, is translated into not available thermal energy, we term it the self discharges of battery.
Under battery group floating charge power mode, other than providing DC power supply to transforming plant DC load, also moment supplement stores charger
The self discharge of battery pack, to ensure that the battery group capacity moment meets the requirement of system normal operation.
Battery group self-discharge current size is related with accumulator capacity, manufacturing process, operating condition and environment etc., such as schemes
Shown in 5, under the normal floating charge state of battery, the high-precision current that can be connected to by battery group in DC bus circuit
Table obtains.General floating current is 1~3mA/Ah.
As shown in figure 5, when battery disconnecting link K2 people is to disconnect, or voluntarily failure tripping and disconnecting link internal fault are breaking
When, battery and DC bus are detached from, and charger no longer provides self-discharge current for battery group, and the reading of ammeter is zero.
Therefore, being closely connected for DC bus and battery group can be ensured by the method for this cutout detection, in order to which guarantee can
By precision maneuver, it being added time element, setting time locking, electric current is zero to be reliably failure to actuate when having not timed out up to setting value,
When reaching setting value, is started from discriminating element to monitoring backstage and remote dispatching and send alarm command, remind operation maintenance personnel or inspection
Personnel are repaired to eliminate this failure, it is ensured that direct current system it is reliable and stable.
Present invention enhances itself real-time detection of battery, enhances and contacted with direct current system.Battery self-test
Mode can under normal floating charging working condition automatic real-time detection battery superiority and inferiority, and whether can have by ammeter
The integrality of reading verifying DC loop.It is securely and reliably, time saving and energy saving compared to more existing storage battery checking charge and discharge test.
And the battery self-test period matches with equalizaing charge, has filled with putting, discharges accumulator capacity to the greatest extent,
Extend the service life of battery.
Battery cutout detection can effectively detect contacting for battery group and direct current system in real time, when battery group because
When being detached from direct current system for any reason, substation person on duty or scheduling can receive at the first time alarm signal,
Ensure that failure can be handled reliably in time.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (10)
1. a kind of direct current system real-time detection method for substation, which comprises the following steps:
Battery is run in a manner of floating charging；
Start autonomous test pattern, reduces charger charging voltage；
Whether reversed detect battery output ammeter power flow direction；
If it is reversed, then connect battery discharge loop disconnecting link and carry out constant-current discharge；When single battery difference in voltage is less than
When setting voltage value, battery discharge loop disconnecting link is disconnected, increases battery voltage；Otherwise the announcement of accumulator internal resistance exception is exported
Alert signal, is then turned off battery discharge loop disconnecting link；If not reversed, then the alarm signal of output loop exception, disconnects
Battery discharge loop disconnecting link；
The charging voltage of battery is increased, battery enters equalizaing charge.
2. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
Start autonomous test pattern, reduces charger charging voltage；Specifically, 5min starts self-test interruption system before carrying out equalizaing charge
System, detects battery, charging voltage is reduced to the 90% of voltage rating at this time.
3. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
It connects battery discharge loop disconnecting link and carries out the discharge time of constant-current discharge as 3min.
4. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
The voltage difference set is 0.4V.
5. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
The charging voltage of battery is increased, battery enters equalizaing charge, specifically: the charging voltage for increasing battery reaches specified electricity
Pressure 100%.
6. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that also wrap
It including, battery cutout is detected by cutout detection device, the cutout detection device is latched by time element, setting time,
Electric current is zero to be reliably failure to actuate when having not timed out up to setting value, when reaching setting value, is started from discriminating element to monitoring backstage
Alarm command is sent with remote dispatching.
7. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
Float charge voltage is 2.23~2.28V/ monomer.
8. a kind of direct current system real-time detection method for substation according to claim 7, which is characterized in that described
Float charge voltage is selected as 2.25V/ monomer.
9. a kind of direct current system real-time detection method for substation according to claim 1, which is characterized in that described
Equalizaing charge voltage is 2.3~2.4V/ monomer.
10. a kind of direct current system real-time detection method for substation according to claim 9, which is characterized in that institute
State equalizaing charge voltage selection 2.35V/ monomer.
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| CN107390142B (en) * | 2017-09-13 | 2023-08-15 | 国网黑龙江省电力有限公司佳木斯供电公司 | Transformer substation direct-current power supply state monitoring system and power supply state monitoring method |
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| CN111044915A (en) * | 2019-06-26 | 2020-04-21 | 荷贝克电源系统（溧阳）有限公司 | Storage battery capacity control system of rail transit vehicle-mounted power system and detection method 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 |
| CN112526250A (en) * | 2020-10-13 | 2021-03-19 | 国网山东省电力公司莘县供电公司 | Direct current system state integrated monitoring system |
| CN113030747A (en) * | 2021-02-05 | 2021-06-25 | 国网宁夏电力有限公司吴忠供电公司 | Station storage battery pack checking discharge test system |
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| JP2009224062A (en) * | 2008-03-13 | 2009-10-01 | Sanken Electric Co Ltd | Discharge tube lighting apparatus |
| CN101764426B (en) * | 2010-02-05 | 2012-01-11 | 四川电力试验研究院 | Protective device for on-line discharge capacity test of storage battery and testing method thereof |
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