CN111725867A - Remote automatic maintenance system and maintenance method for storage battery - Google Patents
Remote automatic maintenance system and maintenance method for storage battery Download PDFInfo
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- CN111725867A CN111725867A CN202010589407.8A CN202010589407A CN111725867A CN 111725867 A CN111725867 A CN 111725867A CN 202010589407 A CN202010589407 A CN 202010589407A CN 111725867 A CN111725867 A CN 111725867A
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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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- 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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- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a storage battery remote automatic maintenance system, which comprises a charge-discharge monitoring device, a local control module, a discharge device, a charging device and a switching device among storage battery packs; the maintenance method provided by the invention completes the maintenance work of charging and discharging the storage battery, calculating the capacity of the storage battery, detecting the open-circuit fault of the storage battery pack and the like through the online monitoring and state analysis of the storage battery, finds out the storage battery with insufficient capacity in time and replaces the storage battery, realizes the automatic maintenance function of the storage battery, effectively reduces the consumption of manpower and material resources, and greatly improves the working efficiency and quality; the maintenance and fault data stored by the system are used for field station management and maintenance personnel to carry out statistics and analysis, so that the unified management of the storage batteries of the power station is facilitated.
Description
Technical Field
The invention belongs to the technical field of battery maintenance, and particularly relates to a remote automatic maintenance system and a maintenance method for a storage battery.
Background
The storage battery pack is used as an important power supply of a direct-current power supply system of a power plant, a transformer substation and a converter station, is the only device for supplying power to the outside of a direct-current system in a power system and a communication system, the performance of the storage battery pack is directly related to the safety and reliability of the power system and the communication system, the power supply capability of the storage battery pack is the final guarantee for the stable operation of the plant station device, and the reliability of the storage battery pack finally determines the reliability of the direct-current system, so that the stable operation of a power grid is greatly. Therefore, the stability of the battery and its capacity discharged during the actual discharge process are of great importance to ensure the proper operation of the electrical equipment.
In recent years, the open circuit faults of a plurality of storage batteries occur in a domestic power system, so that the accidents of protection refusal and override trip of a transformer substation occur, and even a large-area power failure accident is caused; the accident that the storage battery pack is burnt due to the short-circuit fault of the storage battery; the serious consequence that the main power station is burnt out due to the voltage loss accident of the storage battery and the direct current bus is also generated; therefore, the regular monitoring and maintenance of the storage battery are very necessary and important links which are not neglected.
The life of the storage battery is directly related to the floating charge operation mode and the operation temperature, and the storage battery with problems usually shows increased internal resistance; therefore, the storage battery is monitored on line in real time, the single storage battery with faults is identified and processed in time, and the service life of the storage battery pack can be effectively prolonged. In order to ensure the uninterrupted power supply system, it is very important to check the capacity of the storage battery periodically and accurately know the real capacity of the storage battery.
At present, the maintenance method of the storage battery comprises an off-line measurement method, an on-line measurement method and a periodic nuclear capacitive discharge test, and the parameters of the storage battery, such as voltage, internal resistance, temperature, capacity and the like, are tracked and checked. The nuclear capacity discharge is the most effective means for measuring the power supply capacity of the storage battery accepted so far, the traditional field nuclear capacity operation is complicated, a large amount of manpower and material resources are consumed, along with the increase of the battery packs, most of the storage battery packs do not carry out capacity test according to the period required by regulations, and even the situation that the storage battery packs do not carry out one-time thorough capacity test after being delivered and used after being completed in an engineering exists; on the other hand, during the discharge of the battery, a large amount of heat energy is generated due to problems such as chemical reaction, internal resistance, contact failure of the connection bars, and the like, and there is a possibility that the battery may catch fire due to overheating. Therefore, the whole process of the nuclear capacity of the storage battery and the subsequent uniform charging process must be tracked by people on site, and a large amount of human resources are wasted; the time of one-time discharge test is long, the labor intensity of tracking maintenance personnel is high, and the working quality is easily reduced due to fatigue; at present, the configuration of operation and maintenance personnel cannot meet the operation and maintenance requirements specified by regulations. Therefore, research on a safer and comprehensive maintenance method for the storage battery is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the remote automatic maintenance system and the maintenance method for the storage battery are used for replacing manual maintenance operation and eliminating potential safety hazards of the storage battery.
The technical scheme adopted by the invention for solving the technical problems is as follows: a remote automatic maintenance system for a storage battery comprises a charge-discharge monitoring device, a local control module, a discharging device, a charging device and an inter-storage-battery-pack switching device, wherein the charge-discharge monitoring device is used for collecting and storing data of a storage battery pack, including pack end voltage, pack end current, voltage data of a direct current bus and voltage data of charging equipment, pre-judging the data according to a preset value, uploading the data and a pre-judging result, and receiving a command sent by a local control module; the charging and discharging monitoring device comprises a voltage sensor, a current sensor, an internal resistance sensor and a temperature sensor which are used for monitoring the storage battery, and a voltage sensor which is used for monitoring the direct current bus; setting the number of groups of the storage battery pack to be maintained and the number of sections of the direct current bus corresponding to the storage battery pack to be n, wherein n is more than or equal to 2, and the charging and discharging end of the storage battery pack n is respectively connected with the direct current bus n, the input end of the discharging device and the output end of the charging device through a switching device among the storage battery packs; the output end of the charging device is connected with the direct current bus through the switching device among the storage battery packs; the detection end of the charge and discharge monitoring device is respectively connected with the storage battery pack and the direct current bus, and the signal output end of the charge and discharge monitoring device is connected with the signal input end of the local control module; and the control end of the local control module is respectively connected with the controlled end of the charging device, the controlled end of the discharging device and the controlled end of the switching device among the storage battery packs.
According to the scheme, the charging and discharging monitoring device comprises a storage battery monitoring module 1, storage battery monitoring modules 2 and …, a storage battery monitoring module n, a direct current bus monitoring module 1, direct current bus monitoring modules 2 and … and a direct current bus monitoring module n; the detection end of the storage battery monitoring module n is connected with the storage battery pack n; and the detection end of the direct current bus monitoring module n is connected with the direct current bus n.
Further, the charging device comprises a charger 1, a charger 2, … and a charger n, wherein the output end of the charger n is respectively connected with the charging and discharging end of the storage battery n and the direct current bus n through the storage battery group switching device.
Further, the inter-battery switching device comprises a controlled switch Kn1, a controlled switch Kn2, a controlled switch Kn3 and a controlled switch Kn 4; the switch contact of the controlled switch Kn1 is connected in series between the charging and discharging end of the storage battery pack n and the direct current bus n; the switch contact of the controlled switch Kn2 is connected in series between the output end of the charger n and the direct current bus n; the switch contact of the controlled switch Kn3 is connected in series between the charging and discharging end of the storage battery pack n and the output end of the charger n; the switch contacts of controlled switch Kn4 are connected in series between the charge and discharge terminals of battery pack n and the input terminals of the discharge device.
Further, the switching device between the storage battery packs further comprises a bus tie switch Kn0 for realizing an anti-islanding protection function, and a switch contact of the bus tie switch Kn0 is connected between the direct-current bus n-1 and the direct-current bus n in series.
According to the scheme, the mobile terminal device further comprises a communication module used for communicating with an upper computer, a network module used for communicating with the internet, a remote platform used for receiving monitoring data sent by a local control module and sending a remote control command to the storage battery pack switching device, an input module used for converting user operation into a signal and sending the signal to the local control module, and an output module used for displaying the signal output by the local control module to a user, wherein the output module comprises a display, an audible and visual alarm and a short message module used for sending a short message to the mobile terminal device according to the received command; the local control module is connected with the Internet sequentially through the communication module and the network module; the remote platform is connected with the network module through the Internet; the signal output end of the input module is connected with the signal input end of the local control module; the signal input end of the output module is connected with the signal output end of the local control module; the signal input end of the short message module is connected with the signal output end of the local control module, and the wireless signal receiving and transmitting end of the short message module is connected with the mobile terminal device through a wireless network.
A remote automatic maintenance method for a storage battery comprises the following steps:
s1: checking whether each function of the system meets preset indexes;
s2: preparation before discharge operation for battery pack n: the discharging device is fixedly connected with the storage battery by adopting a standard part, and whether electrode connecting strips of the storage battery are fastened or not is checked one by one; a switching-on bus coupler switch Kn0, a switching-off controlled switch Kn1 and a controlled switch Kn2 are used for ensuring normal operation of a direct-current bus n-1 section;
s3: starting the discharging operation of the battery pack n: the closing controlled switch Kn4 starts to discharge; in the discharging process, the temperature of the storage battery is measured once every 1 hour;
s4: and (3) completing recovery of discharge of the storage battery pack n: after discharging, the switching-off controlled switch Kn4 and the switching-on controlled switch Kn3 are used, the charging device carries out uniform charging on the storage battery n, floating charging is carried out after the uniform charging is finished, the switching-off controlled switch Kn3 stands for the storage battery after the floating charging is finished, and after the absolute value of the difference between the voltage of the storage battery and the voltage of the direct-current bus is smaller than 5V, the switching-on controlled switch Kn1, the switching-on controlled switch Kn2 and the switching-off bus linkage switch Kn0 are sequentially carried out, so that the discharging process is finished;
s5: the storage battery pack n-1 and the storage battery pack n normally operate: the charging device comprises a switching-on controlled switch Kn-11, a controlled switch Kn-12, a controlled switch Kn1, a controlled switch Kn2, a switching-off bus-coupler switch Kn0, a controlled switch Kn-13, a controlled switch Kn-14, a controlled switch Kn3 and a controlled switch Kn4, wherein the charging device carries a direct-current bus load and simultaneously charges a storage battery pack n-1 and a storage battery pack n;
s6: and the local control module calculates the capacity of the storage battery pack n according to the constant discharge current and the discharge time acquired in the discharge process.
Further, in step S1, the specific steps include:
s11: whether the local control module and the remote platform can normally receive data including voltage and current sent by the charging and discharging monitoring device is checked;
s12: whether the local control module and the remote platform can normally control the charging device, the discharging device to start and stop and the storage battery pack switching device to switch;
s13: setting charging and discharging time, and checking whether the system can normally complete the discharging and charging processes;
s14: checking whether a system stores historical data or not and generating a charging and discharging curve;
s15: and (5) rechecking whether the capacity accounting of the storage battery pack is accurate or not according to the record.
Further, the discharging operation of step S3 includes:
off-line remote discharge: during remote charging and discharging, the storage battery pack is disconnected with the direct current bus;
indirect online remote discharge: when the battery pack is discharged remotely, the battery pack is used as a backup power supply; when the direct current bus is in voltage loss, the storage battery pack supplies power to the direct current bus, but the direct current bus does not supply power to the storage battery pack, so that the independence of checking the capacity by the storage battery pack is ensured;
online remote discharge: and during remote charging and discharging, the storage battery pack is connected with the direct current bus and supplies power to each other.
Further, the capacity equation of the battery pack n at step S6 is:
C＝If×t(Ah)，
in the formula: c is the capacity of the storage battery pack n, and the unit is ampere hour Ah; if is constant discharge current in amperes A, t is discharge time in hours h.
The invention has the beneficial effects that:
1. according to the remote automatic maintenance system and the maintenance method for the storage battery, disclosed by the invention, the storage battery is subjected to online comprehensive monitoring and remote charging and discharging, so that the functions of replacing manual maintenance operation and eliminating potential safety hazards of the battery are realized.
2. The invention has simple operation and real-time and comprehensive monitoring results, finds out the open circuit and short circuit faults of the backward batteries, particularly the storage batteries in advance, and replaces the backward batteries in time, thereby reducing the labor intensity of operation and maintenance personnel and improving the working quality.
3. The invention realizes the dynamic online monitoring and maintenance of the storage battery pack, overcomes the defects of the static, offline and intermittent storage battery maintenance method adopted at present, ensures that the storage battery pack is in a good working state, prevents the failure accident of protection equipment caused by the failure of the storage battery, effectively provides the accident discharge capacity, fully exerts the backup function of the storage battery and furthest ensures the safety of a power grid.
4. The invention feeds back the electric quantity discharged by the storage battery to the alternating current power grid through the inversion of the discharging device, reduces the heat productivity of the storage battery in the discharging process and meets the requirements of environmental protection.
Drawings
FIG. 1 is a functional block diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of an embodiment of the present invention.
Fig. 3 is a flow chart of an inspection of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the embodiment of the present invention includes a charge/discharge monitoring device for collecting and storing data including a pack terminal voltage, a pack terminal current, a voltage data of a dc bus, and a voltage data of a charging device of a battery pack, pre-judging the data according to a preset value, uploading the data and the pre-judged result, and receiving a command sent by a local control module, a local control module for sending a command to a discharging device, a charging device and an inter-battery pack switching device respectively according to the received data, a discharging device for releasing electric energy stored in the battery pack according to the received command, a charging device for charging the battery according to the received command, an inter-battery pack switching device for switching a connection mode of the battery according to the received command, a communication module for communicating with an upper computer and a network module for communicating with the internet, and for receiving the monitoring data sent by the local control module, the remote control module is used for converting user operation into signals and sending the signals to the input module of the local control module, the output module is used for displaying the signals output by the local control module to a user, and the short message module is used for sending short messages to the mobile terminal equipment according to the received commands.
In this embodiment, the number of groups of the storage battery pack to be maintained and the number of segments of the direct current bus corresponding to the storage battery pack are both 2; the charging and discharging monitoring device comprises a storage battery monitoring module 1, a storage battery monitoring module 2, a direct current bus monitoring module 1 and a direct current bus monitoring module 2; the detection ends of the storage battery monitoring module 1 and the storage battery monitoring module 2 are respectively connected with the storage battery pack 1 and the storage battery pack 2; the detection ends of the direct current bus monitoring module 1 and the direct current bus monitoring module 2 are connected with the direct current bus 1 and the direct current bus 2. The battery monitoring module 1 and the storage battery monitoring module 2 respectively comprise a voltage sensor, a current sensor, an internal resistance sensor and a temperature sensor which are used for monitoring the storage battery pack 1 and the storage battery pack 2; the direct current bus monitoring module 1 and the direct current bus monitoring module 2 respectively comprise a voltage sensor for monitoring the direct current bus 1 and the direct current bus 2.
The detection ends of the storage battery monitoring module and the direct-current bus monitoring module are respectively connected with the storage battery pack and the direct-current bus, and the signal output ends of the storage battery monitoring module and the direct-current bus monitoring module are respectively connected with the signal input end of the local control module; and the control end of the local control module is respectively connected with the controlled end of the charging device, the controlled end of the discharging device and the controlled end of the switching device among the storage battery packs.
The switching device between the storage battery groups comprises a controlled switch K11 with an auxiliary node, a controlled switch K12, a controlled switch K13, a controlled switch K14, a controlled switch K21, a controlled switch K22, a controlled switch K23, a controlled switch K24 and a bus-bar switch K10 for realizing an anti-islanding protection function; the switch contact of the bus coupler switch K10 is connected in series between the direct current bus 1 and the direct current bus 2, when alternating current is lost, the connection between direct current bus sections is timely disconnected, a full-automatic remote safety discharge control strategy is implemented, and abnormal conditions in the discharge process of the storage battery are effectively coped with.
The discharging device is a feedback type inversion discharging device and is used for converting direct current electric energy of the storage battery into alternating current with the same frequency and phase as low-voltage alternating current for the transformer substation under the control of the remote platform, and recovering the discharging electric energy of the storage battery through a power grid, so that the discharging device meets the requirements of environmental protection.
The charging device comprises a charger 1 and a charger 2; the output end of the charger 1 is connected with the charging and discharging end of the storage battery pack 1 through a controlled switch K13 and is connected with the direct current bus 1 through a controlled switch K12; the output end of the charger 2 is connected with the charging and discharging end of the storage battery pack 2 through a controlled switch K23 and is connected with the direct current bus 2 through a controlled switch K22.
The charging and discharging end of the storage battery pack 1 is connected with the direct current bus 1 through a controlled switch K11 and is connected with the input end of the discharging device through a controlled switch K14; the charging and discharging end of the storage battery pack 2 is connected with the direct current bus 2 through a controlled switch K21, and is connected with the input end of the discharging device through a controlled switch K24.
When the storage battery pack needs to be discharged, the controlled switch separates the storage battery pack from the direct current bus and accesses the feedback type inversion discharging device under the control of the local control module and the remote platform, and the other group of storage batteries are ensured to supply power for the direct current bus in the discharging process of one group of storage batteries; after the discharge is finished, the connection between the storage battery pack and the feedback type inversion discharge device is disconnected, and the storage battery pack is connected to a charger to carry out the uniform charge and charge process; when the state of the charger is changed from uniform charging to floating charging, the storage battery is connected with the direct current bus to normally operate. The situation that the storage battery is short of discharge due to long-term charging is solved through the safety online discharge method.
The local control module is connected with the remote platform sequentially through the communication module, the network module and the internet. The signal input end of the short message module is connected with the signal output end of the local control module, and the wireless signal receiving and transmitting end of the short message module is connected with the mobile terminal device through a wireless network.
The output module comprises a display and an audible and visual alarm; the signal input end of the display module is connected with the signal output end of the local control module, the display module displays the received data in a form including a table, a bar chart and a trend chart, and provides a history data viewing function when a user inquires; the local control module comprises at least one path of alarm main contact point, and a switch of the audible and visual alarm is connected with the alarm main contact point of the local control module;
referring to fig. 2 and 3, a remote automatic maintenance method of a storage battery includes the following steps:
s1: checking whether each function of the system meets preset indexes:
s11: whether the local control module and the remote platform can normally receive data including voltage and current sent by the charging and discharging monitoring device is checked;
s12: whether the local control module and the remote platform can normally control the charging device, the discharging device to start and stop and the storage battery pack switching device to switch;
s13: setting charging and discharging time, and checking whether the system can normally complete the discharging and charging processes;
s14: checking whether a system stores historical data or not and generating a charging and discharging curve;
s15: and (5) rechecking whether the capacity accounting of the storage battery pack is accurate or not according to the record.
S2: preparation before discharge operation for battery pack n: the discharging device is fixedly connected with the storage battery by lug bolts, and whether electrode connecting strips of the storage battery are fastened or not is checked one by one; a switching-on bus coupler switch Kn0, a switching-off controlled switch Kn1 and a controlled switch Kn2 are used for ensuring normal operation of a direct-current bus n-1 section;
s3: starting the discharging operation of the battery pack n: the closing controlled switch Kn4 starts to discharge; in the discharging process, the infrared thermometer is used for measuring the temperature of the storage battery once every 1 hour; the discharging operation includes:
off-line remote discharge: during remote charging and discharging, the storage battery pack is disconnected with the direct current bus;
indirect online remote discharge: when the battery pack is discharged remotely, the battery pack is used as a backup power supply; when the direct current bus is in voltage loss, the storage battery pack supplies power to the direct current bus, but the direct current bus does not supply power to the storage battery pack, so that the independence of checking the capacity by the storage battery pack is ensured;
online remote discharge: and during remote charging and discharging, the storage battery pack is connected with the direct current bus and supplies power to each other.
S4: and (3) completing recovery of discharge of the storage battery pack n: after discharging, the switching-off controlled switch Kn4 and the switching-on controlled switch Kn3 are used, the charging device carries out uniform charging on the storage battery n, floating charging is carried out after the uniform charging is finished, the switching-off controlled switch Kn3 stands for the storage battery after the floating charging is finished, and after the absolute value of the difference between the voltage of the storage battery and the voltage of the direct-current bus is smaller than 5V, the switching-on controlled switch Kn1, the switching-on controlled switch Kn2 and the switching-off bus linkage switch Kn0 are sequentially carried out, so that the discharging process is finished;
s5: the storage battery pack n-1 and the storage battery pack n normally operate: the charging device comprises a switching-on controlled switch Kn-11, a controlled switch Kn-12, a controlled switch Kn1, a controlled switch Kn2, a switching-off bus-coupler switch Kn0, a controlled switch Kn-13, a controlled switch Kn-14, a controlled switch Kn3 and a controlled switch Kn4, wherein the charging device carries a direct-current bus load and simultaneously charges a storage battery pack n-1 and a storage battery pack n;
s6: the local control module calculates the capacity of the storage battery pack n according to the constant discharge current and the discharge time acquired in the discharge process, and the capacity formula is as follows:
C＝If×t(Ah)，
in the formula: c is the capacity of the storage battery pack n, and the unit is ampere hour Ah; if is constant discharge current in amperes A, t is discharge time in hours h.
The cycle of the storage battery pack for carrying out the nuclear capacity discharge test is as follows: carrying out full-capacity check charging and discharging on the newly installed storage battery pack; carrying out full-capacity check charging and discharging for 1 time every 2 years; after running for 4 years, carrying out full-capacity check charging and discharging for 1 time every year; the test standards and methods of the nuclear capacity test are as follows:
i10 constant current is adopted in the nuclear capacity discharge test; constant current discharge is generally carried out with a 10-hour discharge current I10, i.e., I10 ═ C10/10. When the voltage of any single storage battery is reduced to 1.8V or the voltage of the storage battery pack is reduced to 1.8V multiplied by N (N is the number of the single storage batteries in the group) after ten hours, the discharging is stopped, and the constant-current voltage-limiting charging, the constant-voltage charging and the floating charging are sequentially carried out by using the I10 current in time.
The acceptance standard of the storage battery pack for the nuclear capacity discharge test is as follows: if the newly installed storage battery pack is not 100% of the rated capacity value within three charge-discharge cycles, the storage battery pack is unqualified; and (4) for the battery pack which is put into operation, if the capacity of the battery pack does not reach more than 80% of the rated capacity of the battery pack after three times of full-check charge and discharge experiments, the battery pack is required to be replaced.
The data of the capacity test of the storage battery pack, the voltage value of the single storage battery, the internal resistance value and the like are stored in the remote platform as acceptance data, historical data in the remote platform is called for comparison and judgment when the storage battery pack is maintained, and the state change process of the storage battery pack can be visually and comprehensively analyzed.
According to the invention, under the condition of no need of manual operation, maintenance work such as charging and discharging of the storage battery, storage battery capacity calculation, detection of open-circuit fault of the storage battery pack and the like is completed through online monitoring and state analysis of the storage battery, the storage battery with insufficient capacity is found in time and replaced, the automatic maintenance function of the storage battery is realized, the consumption of manpower and material resources is effectively reduced, and the working efficiency and quality are greatly improved; the maintenance and fault data stored by the system are used for field station management and maintenance personnel to carry out statistics and analysis, so that the unified management of the storage batteries of the power station is facilitated.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (10)
1. A remote automatic maintenance system for a storage battery is characterized in that: comprises that
A charge and discharge monitoring device for collecting and storing data including group terminal voltage and group terminal current of the storage battery, voltage data of the DC bus and voltage data of the charging equipment, pre-judging the data according to a preset value, uploading the data and the pre-judging result, and receiving a command sent by a local control module,
a local control module used for respectively sending commands to the discharging device, the charging device and the switching device among the storage battery packs according to the received data,
a discharge device for discharging the electrical energy stored by the accumulator according to the received command,
charging means for charging the accumulator in accordance with the received command,
and a switching device between the storage battery packs for switching the connection mode of the storage battery according to the received command;
the charging and discharging monitoring device comprises a voltage sensor, a current sensor, an internal resistance sensor and a temperature sensor which are used for monitoring the storage battery, and a voltage sensor which is used for monitoring the direct current bus;
setting the number of groups of the storage battery pack to be maintained and the number of sections of the direct current bus corresponding to the storage battery pack to be n, wherein n is more than or equal to 2, and the charging and discharging end of the storage battery pack n is respectively connected with the direct current bus n, the input end of the discharging device and the output end of the charging device through a switching device among the storage battery packs; the output end of the charging device is connected with the direct current bus through the switching device among the storage battery packs; the detection end of the charge and discharge monitoring device is respectively connected with the storage battery pack and the direct current bus, and the signal output end of the charge and discharge monitoring device is connected with the signal input end of the local control module; and the control end of the local control module is respectively connected with the controlled end of the charging device, the controlled end of the discharging device and the controlled end of the switching device among the storage battery packs.
2. The remote automatic maintenance system of a storage battery according to claim 1, characterized in that: the charging and discharging monitoring device comprises a storage battery monitoring module 1, storage battery monitoring modules 2 and …, a storage battery monitoring module n, a direct current bus monitoring module 1, direct current bus monitoring modules 2 and … and a direct current bus monitoring module n; the detection end of the storage battery monitoring module n is connected with the storage battery pack n; and the detection end of the direct current bus monitoring module n is connected with the direct current bus n.
3. The remote automatic maintenance system of a storage battery according to claim 2, characterized in that: the charging device comprises a charger 1, chargers 2 and … and a charger n, wherein the output end of the charger n is respectively connected with the charging and discharging end of the storage battery pack n and the direct-current bus n through a storage battery pack switching device.
4. The remote automatic maintenance system of a storage battery according to claim 3, characterized in that: the switching device between the storage battery packs comprises a controlled switch Kn1, a controlled switch Kn2, a controlled switch Kn3 and a controlled switch Kn 4; the switch contact of the controlled switch Kn1 is connected in series between the charging and discharging end of the storage battery pack n and the direct current bus n;
the switch contact of the controlled switch Kn2 is connected in series between the output end of the charger n and the direct current bus n;
the switch contact of the controlled switch Kn3 is connected in series between the charging and discharging end of the storage battery pack n and the output end of the charger n;
the switch contacts of controlled switch Kn4 are connected in series between the charge and discharge terminals of battery pack n and the input terminals of the discharge device.
5. The remote automatic maintenance system of the storage battery according to claim 4, characterized in that: the switching device between the storage battery packs further comprises a bus-coupled switch Kn0 for realizing an anti-islanding protection function, and a switch contact of the bus-coupled switch Kn0 is connected between the direct-current bus n-1 and the direct-current bus n in series.
6. The remote automatic maintenance system of a storage battery according to claim 1, characterized in that: the mobile terminal device comprises a storage battery pack switching device, a communication module, a network module, a remote platform, an input module, an output module and a short message module, wherein the communication module is used for communicating with an upper computer, the network module is used for communicating with the internet, the remote platform is used for receiving monitoring data sent by a local control module and sending a remote control command to the storage battery pack switching device, the input module is used for converting user operation into a signal and sending the signal to the local control module, the output module is used for displaying the signal output by the local control module to a user, and the output module comprises a display, an audible and visual alarm and a short message module for; the local control module is connected with the Internet sequentially through the communication module and the network module; the remote platform is connected with the network module through the Internet; the signal output end of the input module is connected with the signal input end of the local control module; the signal input end of the output module is connected with the signal output end of the local control module; the signal input end of the short message module is connected with the signal output end of the local control module, and the wireless signal receiving and transmitting end of the short message module is connected with the mobile terminal device through a wireless network.
7. The maintenance method of the storage battery remote automatic maintenance system according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1: checking whether each function of the system meets preset indexes;
s2: preparation before discharge operation for battery pack n: the discharging device is fixedly connected with the storage battery by adopting a standard part, and whether electrode connecting strips of the storage battery are fastened or not is checked one by one; a switching-on bus coupler switch Kn0, a switching-off controlled switch Kn1 and a controlled switch Kn2 are used for ensuring normal operation of a direct-current bus n-1 section;
s3: starting the discharging operation of the battery pack n: the closing controlled switch Kn4 starts to discharge; in the discharging process, the temperature of the storage battery is measured once every 1 hour;
s4: and (3) completing recovery of discharge of the storage battery pack n: after discharging, the switching-off controlled switch Kn4 and the switching-on controlled switch Kn3 are used, the charging device carries out uniform charging on the storage battery n, floating charging is carried out after the uniform charging is finished, the switching-off controlled switch Kn3 stands for the storage battery after the floating charging is finished, and after the absolute value of the difference between the voltage of the storage battery and the voltage of the direct-current bus is smaller than 5V, the switching-on controlled switch Kn1, the switching-on controlled switch Kn2 and the switching-off bus linkage switch Kn0 are sequentially carried out, so that the discharging process is finished;
s5: the storage battery pack n-1 and the storage battery pack n normally operate: the charging device comprises a switching-on controlled switch Kn-11, a controlled switch Kn-12, a controlled switch Kn1, a controlled switch Kn2, a switching-off bus-coupler switch Kn0, a controlled switch Kn-13, a controlled switch Kn-14, a controlled switch Kn3 and a controlled switch Kn4, wherein the charging device carries a direct-current bus load and simultaneously charges a storage battery pack n-1 and a storage battery pack n;
s6: and the local control module calculates the capacity of the storage battery pack n according to the constant discharge current and the discharge time acquired in the discharge process.
8. A maintenance method according to claim 7, characterized in that: in the step S1, the specific steps are as follows:
s11: whether the local control module and the remote platform can normally receive data including voltage and current sent by the charging and discharging monitoring device is checked;
s12: whether the local control module and the remote platform can normally control the charging device, the discharging device to start and stop and the storage battery pack switching device to switch;
s13: setting charging and discharging time, and checking whether the system can normally complete the discharging and charging processes;
s14: checking whether a system stores historical data or not and generating a charging and discharging curve;
s15: and (5) rechecking whether the capacity accounting of the storage battery pack is accurate or not according to the record.
9. A maintenance method according to claim 7, characterized in that: the discharging operation of step S3 includes: off-line remote discharge: during remote charging and discharging, the storage battery pack is disconnected with the direct current bus;
indirect online remote discharge: when the battery pack is discharged remotely, the battery pack is used as a backup power supply; when the direct current bus is in voltage loss, the storage battery pack supplies power to the direct current bus, but the direct current bus does not supply power to the storage battery pack, so that the independence of checking the capacity by the storage battery pack is ensured;
online remote discharge: and during remote charging and discharging, the storage battery pack is connected with the direct current bus and supplies power to each other.
10. A maintenance method according to claim 7, characterized in that: the capacity equation of battery pack n at step S6 is:
C＝If×t(Ah)，
in the formula: c is the capacity of the storage battery pack n, and the unit is ampere hour Ah; if is constant discharge current in amperes A, t is discharge time in hours h.
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