CN115954991A - Online inversion charging and discharging device for storage battery pack - Google Patents

Online inversion charging and discharging device for storage battery pack Download PDF

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Publication number
CN115954991A
CN115954991A CN202310233571.9A CN202310233571A CN115954991A CN 115954991 A CN115954991 A CN 115954991A CN 202310233571 A CN202310233571 A CN 202310233571A CN 115954991 A CN115954991 A CN 115954991A
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unit
storage battery
battery pack
control unit
charging
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CN115954991B (en
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程刚
魏伟
杨爱民
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Jiuyuanyun Guangzhou Intelligent Technology Co ltd
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Jiuyuanyun Guangzhou Intelligent Technology Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

The invention provides an online inversion charging and discharging device for a storage battery pack, which relates to the technical field of storage battery pack charging and discharging management and comprises the following components: the charging and discharging control unit, the main control unit, the charging and discharging maintenance unit and the storage battery pack monitoring unit; the charging and discharging control unit receives the instruction of the main control unit, controls the storage battery pack to enter a charging and discharging state, and uploads the data of the storage battery pack in the charging and discharging state to the main control unit; the charge and discharge maintenance unit is connected with the charge and discharge control unit and is used for maintaining the charge and discharge state of the storage battery pack; the main control unit is connected with the charging and discharging maintenance unit and monitors the working state of the charging and discharging maintenance unit; the storage battery monitoring unit is connected with the main control unit, single battery data monitored in a charging and discharging state are uploaded to the main control unit, the main control unit is connected with the remote control platform, collected data are transmitted to the remote control platform, the mechanical property of charging and discharging maintenance work of the storage battery is reduced, and the flexibility of the charging and discharging maintenance work of the storage battery is improved.

Description

Online inversion charging and discharging device for storage battery pack
Technical Field
The invention relates to the technical field of storage battery pack charging and discharging management, in particular to an online inversion charging and discharging device for a storage battery pack.
Background
The storage battery pack is used as a backup power supply of a direct current system of the power substation and is in a floating charge state for a long time, the long-term floating charge state enables electrochemical substances in the storage battery pack to be crystallized, internal resistance is increased, capacity and service life of a battery are affected, and in order to guarantee the charge state and the health degree of the storage battery pack, the storage battery pack needs to be separated from the system and subjected to charge and discharge tests to verify the charge state and the health degree of the storage battery.
At present, a charging and discharging test of a storage battery pack mainly depends on regular operation of maintenance personnel, but a large number of power substations are large in number and wide in distribution, a large number of personnel and equipment need to be invested in the regular maintenance, the investment cost is high, the storage battery pack needs to be detected in a charged mode in the manual maintenance, and potential safety hazards of live working exist; the equipment for discharging the storage battery pack by maintenance personnel is a load mainly comprising a heating resistor, the electric energy of the battery is consumed in a heating mode by using the load, and a large amount of heat is generated during maintenance, so that a direct current system of a power substation has great potential safety hazard; the existing patent literature discloses a storage battery pack charging and discharging system, which comprises a control circuit corresponding to a backup storage battery pack, wherein the control circuit comprises a main controller, a feed network inverter and a tri-state charger; when receiving a discharge instruction sent by a server, a main controller controls a tri-state charger to switch from a floating charge state to a charge state until a backup storage battery pack is full, and then controls the tri-state charger to switch to the discharge state so as to utilize the backup storage battery pack to carry out short-time pre-discharge on a direct current load, and after the short-time pre-discharge does not have discharge abnormity and is normally finished, a feed network inverter is controlled to switch from a standby state to a working state so as to carry out inversion discharge on the backup storage battery pack.
Disclosure of Invention
In order to solve the problems that the charging and discharging maintenance work of the storage battery pack is too mechanical and poor in flexibility in the current storage battery pack charging and discharging management system, the invention provides the storage battery pack online inversion charging and discharging device, the mechanicalness of the charging and discharging maintenance work of the storage battery pack is reduced, and the flexibility of the charging and discharging maintenance work of the storage battery pack is improved.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
an online inversion charging and discharging device of a storage battery pack is used for charging and discharging maintenance of the storage battery pack of a transformer substation, and comprises: the charging and discharging control unit, the main control unit and the charging and discharging maintenance unit;
the input end of the charge and discharge control unit is connected with the positive end of the storage battery pack, the output end of the charge and discharge control unit is connected with the negative end of the storage battery pack, the charge and discharge control unit receives an instruction of the main control unit, controls the storage battery pack to enter a floating charge state, a discharge state and a charge state, uploads storage battery pack data in the floating charge state, the discharge state and the charge state to the main control unit, and further uploads the storage battery pack data to the remote control platform through the main control unit;
the charge and discharge maintenance unit is connected with the charge and discharge control unit, and maintains the working state of the storage battery pack in the floating charge, discharge and charge processes when the charge and discharge control unit controls the storage battery pack to enter the floating charge, discharge and charge states; the main control unit is connected with the charging and discharging maintenance unit and monitors the working state of the charging and discharging maintenance unit.
Preferably, the storage battery online inversion charging and discharging device further comprises an acquisition module and a storage battery monitoring unit, wherein the output end of the acquisition module block is connected with the input end of the storage battery monitoring unit, the output end of the storage battery monitoring unit is connected with the main control unit, the storage battery monitoring unit acquires single-cell data of the storage battery in the floating charging, discharging and charging states through the acquisition module block, the single-cell data of the storage battery in the floating charging, discharging and charging states is uploaded to the main control unit, the main control unit is connected with the remote control platform, and the collected storage battery group data and the single-cell data are transmitted to the remote control platform.
Preferably, the single battery data comprises the voltage, the temperature and the internal resistance of a single battery in the storage battery pack; the battery pack data includes a voltage and a current of the battery pack.
Preferably, the charge-discharge maintenance unit comprises an inversion discharge unit, a feed protection unit, an inversion monitoring unit and a pre-charge unit;
the charging and discharging control unit receives a discharging instruction of the main control unit and controls the storage battery pack to enter a discharging state from a daily floating state, the storage battery pack transmits direct current to the charging and discharging control unit, the output end of the charging and discharging control unit is connected with the input end of the inversion discharging unit, the output end of the inversion discharging unit is connected with the input end of the feeding protection unit, the output end of the feeding protection unit is connected with the input end of the inversion monitoring unit, the inversion discharging unit inverts the direct current into three-phase alternating current, the three-phase alternating current is filtered by the feeding protection unit, and the filtered three-phase alternating current is input into an alternating current power grid of a transformer substation after being monitored by the inversion monitoring unit;
the main control unit is also respectively connected with the inversion discharge unit, the feed protection unit and the inversion monitoring unit and used for monitoring the working states of the inversion discharge unit, the feed protection unit and the inversion monitoring unit;
after the storage battery pack discharges, the main control unit starts a pre-charging command, the output end of the main control unit is connected with the input end of the pre-charging unit, the output end of the pre-charging unit is connected with the input end of the charging and discharging control unit, the main control unit drives the pre-charging unit to pre-charge the storage battery pack, after the storage battery pack pre-charges, the main control unit sends the charging command to the charging and discharging control unit through the pre-charging unit, and the charging and discharging control unit controls the storage battery pack to formally enter a charging state from a discharging state.
Preferably, the storage battery online inversion charging and discharging device further comprises a human-computer interaction unit and an indication unit, the human-computer interaction unit and the indication unit are connected with the main control unit, the human-computer interaction unit is used for displaying storage battery pack data and single battery data collected by the main control unit, and the indication unit is used for displaying the working state of the main control unit.
Preferably, the input end of the charge and discharge control unit is connected with the positive end of the external direct-current power supply unit, the negative end of the external direct-current power supply unit is connected with the output end of the charge and discharge control unit, the charge and discharge control unit collects direct-current data of the external direct-current power supply unit, an overhaul switch is arranged between the positive end of the external direct-current power supply unit and the positive end of the storage battery pack, if the storage battery pack online inversion charge and discharge device fails, the overhaul switch is closed, the external direct-current power supply unit and the storage battery pack form a direct-current loop, the external direct-current power supply unit only supplies power for the storage battery pack, the storage battery pack online inversion charge and discharge device is respectively disconnected with the external direct-current power supply unit and the storage battery pack, and an overhaul worker overhauls the storage battery pack online inversion charge and discharge device.
Preferably, the charge and discharge control unit comprises an MCU, a cooling fan, a first freewheeling diode D, a second freewheeling diode D, a normally closed contactor K, a first normally open contactor K, a second normally open contactor K, a third normally open contactor K, a first fuse FU, a second fuse FU and a third fuse FU; MCU is connected to outside DC power supply unit, for the MCU power supply, radiator fan's input is connected to MCU's output, constitute the afterflow circuit after first freewheeling diode D and second freewheeling diode D are parallelly connected, radiator fan dispels the heat for the afterflow circuit, storage battery's positive terminal is connected respectively to the input of afterflow circuit, normally closed contactor K and second normally open contactor K, the positive terminal of outside DC power supply unit is connected respectively to the output of afterflow circuit, MCU, normally closed contactor K and first normally open contactor K, connect the unit of precharging after first normally open contactor K and first fuse FU establish ties, second normally open contactor K connects the unit of precharging and the contravariant discharge unit respectively with second fuse FU establish ties, the contravariant discharge unit is connected after third normally open contactor K and third fuse FU establish ties.
Preferably, when the storage battery pack discharges, the storage battery pack online inversion charging and discharging device executes self-checking work, and the self-checking work specifically comprises the following steps: the main control unit is firstly communicated with the storage battery pack monitoring unit, the charging and discharging control unit, the feeding protection unit, the inversion monitoring unit and the inversion discharging unit respectively, and then whether the working states of the storage battery pack monitoring unit, the charging and discharging control unit, the feeding protection unit, the inversion monitoring unit and the inversion discharging unit are all normal or not is judged in sequence; otherwise, the main control unit does not send a discharge instruction to the storage battery pack, and the storage battery pack does not discharge.
Preferably, the pre-charging unit is provided with an IGBT power tube, the source electrode of the IGBT power tube is connected with a first fuse FU of the charging and discharging control unit, the emitter electrode of the IGBT power tube is connected with a second fuse FU of the charging and discharging control unit, the grid electrode of the IGBT power tube is connected with the main control unit, and the main control unit drives the IGBT power tube by using a pulse width modulation technology to control the charging current of the storage battery pack.
Preferably, the inverter discharge unit comprises an EMI filter, a DC/DC current stabilizing circuit, an LLC isolating converter, an inverter circuit, a filtering surge protection circuit, a DSP digital control chip, a current control chip, and an LLC control chip;
the output end of the charging and discharging control unit is connected with the input end of an EMI filter, the output end of the EMI filter is connected with the input end of a DC/DC current stabilizing circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charging and discharging control unit, the direct current enters a DC/DC current stabilizing circuit through filtering of the EMI filter, the output end of the DC/DC current stabilizing circuit is connected with the input end of an LLC (logical link control) isolation converter, the filtered direct current is stabilized through the DC/DC current stabilizing circuit and is input into an LLC isolation converter, the LLC isolation converter inverts the direct current into three-phase alternating current, the output end of the LLC isolation converter is connected with the input end of an inverter circuit, the output end of the inverter circuit is connected with the input end of a filtering surge protection circuit, the three-phase alternating current output by the LLC isolation converter is input into the filtering surge protection circuit after voltage is adjusted through the inverter circuit, and the filtering surge protection circuit protects the electric energy quality of the three-phase alternating current output by the inverter circuit;
the output end of the DSP digital control chip is respectively connected with the input end of the current control chip, the input end of the LLC control chip and the input end of the inverter circuit, the DSP digital control chip respectively controls the working states of the current control chip, the LLC control chip and the inverter circuit, the current control chip is bidirectionally connected with the DC/DC current stabilizing circuit to control the working state of the DC/DC current stabilizing circuit, and the LLC control chip is bidirectionally connected with the LLC isolation converter to control the working state of the LLC isolation converter.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides an online inversion charging and discharging device of a storage battery pack, wherein a charging and discharging control unit receives an instruction of a main control unit, controls the storage battery pack to enter a floating charging state, a discharging state and a charging state, realizes the management and control of the floating charging process, the discharging process and the charging process of the storage battery pack, transmits the data of the storage battery pack in the floating charging state, the discharging state and the charging state back to the main control unit for automatic management and control, and further uploads the data to a remote control platform through the main control unit, so that the charging and discharging maintenance work of the storage battery pack is conveniently and comprehensively managed remotely.
Drawings
Fig. 1 is a schematic structural diagram of an online inverting charge-discharge device of a storage battery pack proposed in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an online inverting charge-discharge device of a storage battery pack according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an operation of the inverter discharge unit according to an embodiment of the present invention;
FIG. 4 is a communication connection diagram of the storage battery pack online inversion charging and discharging device according to an embodiment of the present invention;
1. the storage battery pack is an online inversion charging and discharging device; 11. a charge and discharge control unit; 12. a main control unit; 13. a charge and discharge maintenance unit; 131. an inversion discharge unit; 132. a feed protection unit; 1321. a feed switch; 1322. a bidirectional filter; 133. an inversion monitoring unit; 134. a precharge unit; 14. an acquisition module; 15. a storage battery pack monitoring unit; 16. a human-computer interaction unit; 17. an indicating unit; 18. a maintenance switch; 19. an auxiliary power supply unit; 2. an external direct current power supply unit; 21. a direct current load; 22. a direct current power supply.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for better illustration of the embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions, and the description of directions of the parts such as "up" and "down" is not limited to the patent;
it will be understood by those skilled in the art that certain well-known descriptions of the figures may be omitted;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1, the present embodiment provides an online inversion charging and discharging device 1 for a storage battery pack of a substation, which is used for performing charging and discharging maintenance on the storage battery pack of the substation, and includes: a charge and discharge control unit 11, a main control unit 12 and a charge and discharge maintenance unit 13;
the input end of the charge and discharge control unit 11 is connected with the positive end of the storage battery pack, the output end of the charge and discharge control unit 11 is connected with the negative end of the storage battery pack, the charge and discharge control unit 11 receives an instruction of the main control unit 12, controls the storage battery pack to enter a floating charge state, a discharge state and a charge state, uploads storage battery pack data in the floating charge state, the discharge state and the charge state to the main control unit 12, and further uploads the storage battery pack data to the remote control platform through the main control unit 12;
the charge and discharge maintenance unit 13 is connected with the charge and discharge control unit 11, and maintains the working state of the storage battery pack in the floating charge, discharge and charge processes when the charge and discharge control unit 11 controls the storage battery pack to enter the floating charge, discharge and charge states; the main control unit 12 is connected to the charge and discharge maintenance unit 13, and monitors the working state of the charge and discharge maintenance unit 13.
The online inversion charging and discharging device 1 of the storage battery pack further comprises an acquisition module 14 and a storage battery pack monitoring unit 15, wherein the output end of the acquisition module 14 is connected with the input end of the storage battery pack monitoring unit 15, the output end of the storage battery pack monitoring unit 15 is connected with the main control unit 12, the storage battery pack monitoring unit 15 acquires data of single batteries of the storage battery pack in floating charge, discharge and charge states through the acquisition module 14, the data of the single batteries of the storage battery pack in the floating charge, discharge and charge states are uploaded to the main control unit 12, the main control unit 12 is connected with a remote control platform, the collected storage battery pack data and the single battery data are transmitted to the remote control platform, and the single battery data comprise the voltage, the temperature and the internal resistance of the single batteries in the storage battery pack; the battery pack data includes a voltage and a current of the battery pack.
The charge and discharge maintenance unit 13 includes an inverter discharge unit 131, a feed protection unit 132, an inverter monitoring unit 133 and a pre-charge unit 134;
the charging and discharging control unit 11 receives a discharging instruction of the main control unit 12, controls the storage battery pack to enter a discharging state from a daily floating charging state, and transmits direct current to the charging and discharging control unit 11, the output end of the charging and discharging control unit 11 is connected with the input end of the inversion discharging unit 131, the output end of the inversion discharging unit 131 is connected with the input end of the feeding protection unit 132, the output end of the feeding protection unit 132 is connected with the input end of the inversion monitoring unit 133, the inversion discharging unit 131 inverts the direct current into three-phase alternating current, the three-phase alternating current is filtered by the feeding protection unit 132, and the filtered three-phase alternating current is input into an alternating current power grid of a transformer substation after being monitored by the inversion monitoring unit 133;
the main control unit 12 is further connected to the inversion discharging unit 131, the feeding protection unit 132, and the inversion monitoring unit 133, respectively, and monitors the working states of the inversion discharging unit 131, the feeding protection unit 132, and the inversion monitoring unit 133;
after the storage battery pack is discharged, the main control unit 12 starts a pre-charging command, the output end of the main control unit 12 is connected with the input end of the pre-charging unit 134, the output end of the pre-charging unit 134 is connected with the input end of the charging and discharging control unit 11, the main control unit 12 drives the pre-charging unit 134 to pre-charge the storage battery pack, after the storage battery pack is pre-charged, the main control unit 12 sends the charging command to the charging and discharging control unit 11 through the pre-charging unit 134, and the charging and discharging control unit 11 controls the storage battery pack to formally enter a charging state from a discharging state.
The online inversion charging and discharging device 1 of the storage battery pack further comprises a human-computer interaction unit 16 and an indication unit 17, the human-computer interaction unit 16 and the indication unit 17 are connected with the main control unit 12, the human-computer interaction unit 16 is used for displaying storage battery pack data and single battery data collected by the main control unit 12, and the indication unit 17 is used for displaying the working state of the main control unit 12; the charging and discharging control unit 11 and the main control unit 12 are both connected with an auxiliary power supply unit 19, and the external direct current power supply unit 2 respectively supplies power to the charging and discharging control unit 11 and the main control unit 12 through the auxiliary power supply unit 19;
the input end of the charge and discharge control unit 11 is connected with the positive end of the external direct-current power supply unit 2, the negative end of the external direct-current power supply unit 2 is connected with the output end of the charge and discharge control unit 11, the charge and discharge control unit 11 collects direct-current data of the external direct-current power supply unit 2, an overhaul switch 18 is arranged between the positive end of the external direct-current power supply unit 2 and the positive end of the storage battery pack, if the online inversion charge and discharge device 1 of the storage battery pack fails, the overhaul switch 18 is closed, the external direct-current power supply unit 2 and the storage battery pack form a direct-current loop, the external direct-current power supply unit 2 only supplies direct current to the storage battery pack, the online inversion charge and discharge device 1 of the storage battery pack is respectively disconnected from the external direct-current power supply unit 2 and the storage battery pack, a maintainer overhauls the online inversion charge and discharge device 1 of the storage battery pack, and the external direct-current power supply unit 2 is provided with a direct-current load 21 and a direct-current power supply 22 which are connected in parallel.
In this embodiment, the charge and discharge control unit receives the instruction of the main control unit, and controls the storage battery to enter the floating charge, discharge and charge states, so as to realize the management and control of the floating charge, discharge and charge processes of the storage battery, and transmit the storage battery data in the floating charge, discharge and charge states back to the main control unit for automatic management and control, and further upload the data to a remote control platform through the main control unit, so as to facilitate the remote comprehensive management of the charge and discharge maintenance work of the storage battery, and then under the control of the main control unit, the charge and discharge control unit drives the charge and discharge maintenance unit, so as to maintain the working states of the storage battery in the floating charge, discharge and charge processes, reduce the mechanicalness of the charge and discharge maintenance work of the storage battery, and improve the flexibility of the charge and discharge maintenance work of the storage battery.
Example 2
Referring to fig. 1 and 2, the charge and discharge control unit 11 includes an MCU, a heat dissipation fan, a first freewheeling diode D1, a second freewheeling diode D2, a normally closed contactor K1, a first normally open contactor K2, a second normally open contactor K3, a third normally open contactor K4, a first fuse FU1, a second fuse FU2, and a third fuse FU3; MCU is connected to outside DC power supply unit 2, for the MCU power supply, wherein, be equipped with auxiliary power supply unit 19 between outside DC power supply unit 2 and the MCU, auxiliary power supply unit 19 reduces outside DC power supply unit 2's direct current's voltage, direct current in the rated voltage that provides for MCU, radiator fan's input is connected to MCU's output, follow current circuit is constituteed after first freewheeling diode D1 and second freewheeling diode D2 are parallelly connected, radiator fan dispels the heat for the freewheel circuit, storage battery's positive pole end is connected respectively to the input of follow current circuit, normally closed contactor K1 and second normally open contactor K3, the positive pole of outside DC power supply unit 2 is connected respectively to the output of follow current circuit, MCU, normally closed contactor K1 and first normally open contactor K2, connect precharge unit 134 after first normally open contactor K2 establishes ties with first fuse FU1, connect precharge unit 134 and inversion discharge unit 131 respectively after second normally open contactor K3 establishes ties with second fuse FU2, third normally open contactor K4 connects inversion discharge unit 131 after establishing ties with third normally open contactor FU 3.
When the charge and discharge control unit 11 controls the storage battery pack to be switched to a floating charge state, K5 in the overhaul switch 18 is in a disconnected state, K1 of the charge and discharge control unit 11 is in a closed state, a positive end A of the external direct-current power supply unit is connected with a positive end B of the storage battery pack through a normally closed contactor K1 of the charge and discharge control unit 11, and the external direct-current power supply unit 2 carries out daily floating charge on the storage battery pack;
when the storage battery pack discharges, the storage battery pack carries out self-checking work on the online inversion charging and discharging device 1, and the specific steps of the self-checking work are as follows: the main control unit 12 firstly communicates with the storage battery pack monitoring unit 15, the charging and discharging control unit 11, the feeding protection unit 132, the inversion monitoring unit 133 and the inversion discharging unit 131 respectively, and then sequentially judges whether the working states of the storage battery pack monitoring unit 15, the charging and discharging control unit 11, the feeding protection unit 132, the inversion monitoring unit 133 and the inversion discharging unit 131 are all normal, if so, the main control unit 12 sends a discharging instruction to the storage battery pack, and the storage battery pack discharges; otherwise, the main control unit 12 does not issue a discharge command to the battery pack, and the battery pack does not discharge.
When the storage battery pack online inversion charging and discharging device 1 performs self-inspection, the main control unit 12 communicates with the storage battery pack monitoring unit 15 to obtain single-cell data of the storage battery pack monitored by the storage battery pack monitoring unit 15, wherein the single-cell data comprises voltage, temperature and internal resistance of a single cell in the storage battery pack, and whether the actual single-cell data monitored by the storage battery pack monitoring unit 15 is smaller than a monitoring alarm value of the single-cell data set by the storage battery pack monitoring unit 15 is judged, if yes, the working state of the storage battery pack monitoring unit 15 is normal, otherwise, the working state of the storage battery pack monitoring unit 15 is abnormal;
the main control unit 12 communicates with the charge and discharge control unit 11 to respectively acquire the dc power data and the storage battery data acquired by the charge and discharge control unit 11, wherein the storage battery data includes the voltage and the current of the storage battery; the direct current source data comprises voltage and current of a direct current power supply, if actual direct current power supply data acquired by the charging and discharging control unit 11 is smaller than a direct current power supply parameter threshold value set by the charging and discharging control unit 11, actual storage battery pack data acquired by the charging and discharging control unit 11 is smaller than a storage battery pack parameter threshold value set by the charging and discharging control unit 11, and meanwhile, a normally closed contactor K1, a first normally open contactor K2, a second normally open contactor K3, a third normally open contactor K4, a first freewheeling diode D1 and a second freewheeling diode D2 of the charging and discharging control unit 11 are normal, the working state of the charging and discharging control unit 11 is normal, otherwise, the working state of the charging and discharging control unit 11 is abnormal;
the feeding protection unit 132 is connected with an arrester, the feeding protection unit 132 is provided with a feeding switch 1321 and a two-way filter 1322 which are sequentially connected, the main control unit 12 communicates with the feeding protection unit 132, if the arrester and the two-way filter 1322 are in an unwarranted state and the feeding switch 1321 is in a closed state, the working state of the feeding protection unit 132 is normal, otherwise, the working state of the feeding protection unit 132 is abnormal;
the main control unit 12 communicates with the inversion monitoring unit 133 connected to the ac power grid of the substation to obtain a load value of the ac power grid of the substation monitored by the inversion monitoring unit 133, if the actual load value of the ac power grid of the substation monitored by the inversion monitoring unit 133 is greater than a load alarm value of the ac power grid set in the inversion monitoring unit 133, the operating state of the inversion monitoring unit 133 is normal, otherwise, the operating state of the inversion monitoring unit 133 is abnormal;
the main control unit 12 communicates with the inversion discharge unit 131 provided with the inverter, if the inverter works normally, the working state of the inversion discharge unit 131 is normal, otherwise, the working state of the inversion discharge unit 131 is abnormal;
after the self-checking work is completed, the charging and discharging control unit 11 detects whether states of an internal relay node, a radiator temperature and a first freewheeling diode D1 and a second freewheeling diode D2 are abnormal or not, and sends the states of the relay node, the radiator temperature and the first freewheeling diode D1 and the second freewheeling diode D2 to the main control unit 12, at the moment, K5 is in a disconnected state, the normally closed contactor K1 of the charging and discharging control unit 11 is disconnected, the first normally open contactor K2 is disconnected, the second normally open contactor K3 and the third normally open contactor K4 are closed, the main control unit 12 controls the charging and discharging control unit 11 to act, the storage battery pack is separated from an external direct current power supply unit 2 and is connected with a direct current input end of the inversion discharging unit 131, the inversion discharging unit 131 inverts direct current of the storage battery pack into three-phase alternating current according to set voltage and current parameters, the three-phase alternating current power supply is conveyed to an alternating current network of a transformer substation through the feeding protection unit 132 and the inversion monitoring unit 133 to provide electric energy for loads of the alternating current, a bidirectional filtering function of the feeding protection unit 132 to prevent electric energy of the inverter from polluting the power grid, and can prevent the electric energy of the inverter from influencing the stable work of the grid, the inverter, the inversion monitoring unit 133 and the main control unit 12 can timely send the electric network to prevent the electric network from being abnormal when the main control unit 12 to prevent the electric network from being abnormal; when the external direct-current power supply unit 2 is in voltage loss in the discharging process, the storage battery pack can instantly supply power to a bus of the external direct-current power supply unit through the first fly-wheel diode D1 and the second fly-wheel diode D2, the external direct-current power supply unit 2 is ensured not to be in voltage loss by utilizing the one-way conductivity 0 time delay of the first fly-wheel diode D1 and the second fly-wheel diode D2, at the moment, the cooling fans of the first fly-wheel diode D1 and the second fly-wheel diode D2 can be automatically started, the good overcurrent capacity of the first fly-wheel diode D1 and the second fly-wheel diode D2 is ensured, meanwhile, the normally closed contactor K1 is reset and closed, and the storage battery supplies power to the external direct-current power supply unit 2 through the normally closed contactor K1; when the online inversion charging and discharging device 1 of the storage battery pack is maintained, the K5 is directly closed, and the direct current power supply 22 and the storage battery pack are in direct current at the moment, so that the online inversion charging and discharging device 1 of the storage battery pack can be maintained.
Referring to fig. 3, in order to ensure reliable operation of the online inverting charge-discharge device 1 of the storage battery pack provided by this embodiment, a main chip of the main control unit 12 adopts STM32F767, and has 10 paths of serial ports (UART), and 12 paths of the main control unit are opened and closed to form dry contacts, wherein operation and fault indication of the indication unit 17 are driven by an IO port, local, remote and automatic control is performed by the IO port, an emergency stop signal is input and driven by switching value to IO, and the human-computer interaction unit 16 uses serial port communication control. UART1 communicates with the feed guard unit 132, UART4 communicates with the inverter monitoring unit 133, UART2 communicates with the charge and discharge control unit 11, UART3 communicates with the battery pack monitoring unit 15, UART5 communicates in cooperation with ICE68150, UART7 communicates with the remote control platform, UART6 communicates with the inverter discharge unit 131 and the external dc power supply unit 2, and UART8 communicates with the precharge unit 134.
Example 3
Referring to fig. 2, the pre-charging unit 134 is provided with an IGBT power tube, a source electrode of the IGBT power tube is connected to a first fuse FU1 of the charging and discharging control unit 11, an emitter electrode of the IGBT power tube is connected to a second fuse FU2 of the charging and discharging control unit 11, a gate electrode of the IGBT power tube is connected to the main control unit 12, and the main control unit 12 drives the IGBT power tube by using a pulse width modulation technique to control a charging current of the battery pack.
When the storage battery pack needs to be charged after discharging, K5 is in a disconnected state, a normally closed contactor K1 of a charging and discharging control unit 11 is disconnected, a first normally open contactor K2, a second normally open contactor K3 and a third normally open contactor K4 are all closed, the positive pole of an external direct current power supply unit 2 is precharged for the storage battery pack through an IGBT power tube of a precharging unit 134, due to discharging is completed, the voltage difference between the external direct current power supply unit 2 and the storage battery pack is too large, direct charging can cause impact of the storage battery and the external direct current power supply unit 2, when the voltage difference between the external direct current power supply unit 2 and the storage battery pack is smaller than a set threshold value, a main control unit 12 directly controls the IGBT power tube of the precharging unit 134 to be switched on, at the moment, if the charging current of the storage battery pack is smaller than the set threshold value, the normally closed contactor K1 of the charging and discharging control unit 11 is closed, the first normally open contactor K2, the second normally open contactor K3 and the third normally open contactor K4 are all disconnected, and the charging and discharging control unit 11 is in a standby state.
Referring to fig. 4, the inverter discharge unit 131 includes an EMI filter, a DC/DC current stabilizing circuit, an LLC isolation converter, an inverter circuit, a filtering surge protection circuit, a DSP digital control chip, a current control chip, and an LLC control chip;
the output end of the charge and discharge control unit 11 is connected with the input end of an EMI filter, the output end of the EMI filter is connected with the input end of a DC/DC current stabilizing circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charge and discharge control unit 11, the direct current enters a DC/DC current stabilizing circuit through filtering of the EMI filter, the output end of the DC/DC current stabilizing circuit is connected with the input end of an LLC (logical link control) isolation converter, the filtered direct current is stabilized through the DC/DC current stabilizing circuit and is input into an LLC isolation converter, the LLC isolation converter inverts the direct current into three-phase alternating current, the output end of the LLC isolation converter is connected with the input end of an inverter circuit, the output end of the inverter circuit is connected with the input end of a filtering surge protection circuit, the three-phase alternating current output by the LLC isolation converter is input into the filtering surge protection circuit after the voltage is adjusted through the inverter circuit, and the filtering surge protection circuit protects the electric energy quality of the three-phase alternating current output by the inverter circuit;
the output end of the DSP digital control chip is respectively connected with the input end of the current control chip, the input end of the LLC control chip and the input end of the inverter circuit, the DSP digital control chip respectively controls the working states of the current control chip, the LLC control chip and the inverter circuit, the current control chip is bidirectionally connected with the DC/DC current stabilizing circuit and controls the working state of the DC/DC current stabilizing circuit, and the LLC control chip is bidirectionally connected with the LLC isolation converter and controls the working state of the LLC isolation converter; the specific process of converting the direct current into the three-phase alternating current in the inverter discharge unit 131 is as follows: the direct current of the storage battery pack is input into an EM1 filter through a charging and discharging control unit, the direct current enters a DC/DC current stabilizing circuit through EM1 filtering, and a DSP digital control chip controls the discharging current by driving a DC/DC current stabilizing circuit through a current control chip in real time according to the set discharging current value of the storage battery pack and in combination with a current sampling value; meanwhile, the DSP digital control chip drives the LLC control chip according to the discharge setting conditions, direct current output by the DC/DC is converted into alternating current through the LLC isolation converter in an inverted mode and is output, the inverter circuit is controlled by the DSP digital chip to adjust alternating current output voltage and output three-phase alternating current to the filtering surge protection circuit, and the filtering surge protection circuit guarantees the quality of electric energy output by the three-phase alternating current.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides an online contravariant of storage battery charge-discharge device for carry out charge-discharge to the storage battery of transformer substation and maintain, its characterized in that includes: the charging and discharging control unit (11), the main control unit (12) and the charging and discharging maintenance unit (13);
the input end of the charge and discharge control unit (11) is connected with the positive end of the storage battery pack, the output end of the charge and discharge control unit (11) is connected with the negative end of the storage battery pack, the charge and discharge control unit (11) receives an instruction of the main control unit (12), controls the storage battery pack to enter a floating charge state, a discharge state and a charge state, uploads storage battery pack data in the floating charge state, the discharge state and the charge state to the main control unit (12), and further uploads the storage battery pack data to the remote control platform through the main control unit (12);
the charge and discharge maintenance unit (13) is connected with the charge and discharge control unit (11), and maintains the working state of the storage battery pack in the floating charge, discharge and charge processes when the charge and discharge control unit (11) controls the storage battery pack to enter the floating charge, discharge and charge states; the main control unit (12) is connected with the charging and discharging maintenance unit (13) and monitors the working state of the charging and discharging maintenance unit (13).
2. The online inversion charge and discharge device of the storage battery pack according to claim 1, further comprising an acquisition module (14) and a storage battery pack monitoring unit (15), wherein an output end of the acquisition module (14) is connected to an input end of the storage battery pack monitoring unit (15), an output end of the storage battery pack monitoring unit (15) is connected to the main control unit (12), the storage battery pack monitoring unit (15) acquires data of single batteries of the storage battery pack in floating, discharging and charging states through the acquisition module (14), the data of the single batteries of the storage battery pack in the floating, discharging and charging states are uploaded to the main control unit (12), the main control unit (12) is connected to a remote control platform, and the collected data of the storage battery pack and the data of the single batteries are transmitted to the remote control platform.
3. The online inversion charge-discharge device of claim 2, wherein the data of the single battery comprises voltage, temperature and internal resistance of the single battery in the storage battery; the battery pack data includes a voltage and a current of the battery pack.
4. The online inversion charging and discharging device for the storage battery pack according to claim 3, wherein the charging and discharging maintenance unit (13) comprises an inversion discharging unit (131), a feeding protection unit (132), an inversion monitoring unit (133) and a pre-charging unit (134);
the charging and discharging control unit (11) receives a discharging instruction of the main control unit (12) and controls the storage battery pack to enter a discharging state from a daily floating charging state, the storage battery pack transmits direct current to the charging and discharging control unit (11), the output end of the charging and discharging control unit (11) is connected with the input end of the inversion discharging unit (131), the output end of the inversion discharging unit (131) is connected with the input end of the feed protection unit (132), the output end of the feed protection unit (132) is connected with the input end of the inversion monitoring unit (133), the inversion discharging unit (131) inverts the direct current into three-phase alternating current, the three-phase alternating current is filtered by the feed protection unit (132), and the filtered three-phase alternating current is input into an alternating current power grid of a transformer substation after being monitored by the inversion monitoring unit (133);
the main control unit (12) is also respectively connected with the inversion discharge unit (131), the feed protection unit (132) and the inversion monitoring unit (133) and used for monitoring the working states of the inversion discharge unit (131), the feed protection unit (132) and the inversion monitoring unit (133);
after the storage battery pack is discharged, the main control unit (12) starts a pre-charging command, the output end of the main control unit (12) is connected with the input end of the pre-charging unit (134), the output end of the pre-charging unit (134) is connected with the input end of the charging and discharging control unit (11), the main control unit (12) drives the pre-charging unit (134) to pre-charge the storage battery pack, after the pre-charging of the storage battery pack is finished, the main control unit (12) sends the charging command to the charging and discharging control unit (11) through the pre-charging unit (134), and the charging and discharging control unit (11) controls the storage battery pack to formally enter a charging state from a discharging state.
5. The online inversion charge-discharge device for the storage battery pack according to claim 4, further comprising a human-computer interaction unit (16) and an indication unit (17), wherein the human-computer interaction unit (16) and the indication unit (17) are connected to the main control unit (12), the human-computer interaction unit (16) is configured to display the storage battery pack data and the single battery data collected by the main control unit (12), and the indication unit (17) is configured to display the working state of the main control unit (12).
6. The storage battery pack online inversion charging and discharging device according to claim 5, wherein an input end of the charging and discharging control unit (11) is connected to a positive end of the external DC power supply unit (2), a negative end of the external DC power supply unit (2) is connected to an output end of the charging and discharging control unit (11), the charging and discharging control unit (11) collects DC data of the external DC power supply unit (2), an overhaul switch (18) is arranged between the positive end of the external DC power supply unit (2) and a positive end of the storage battery pack, if the storage battery pack online inversion charging and discharging device fails, the overhaul switch (18) is closed, the external DC power supply unit (2) and the storage battery pack form a DC loop, the external DC power supply unit (2) only supplies DC power to the storage battery pack, the storage battery pack online inversion charging and discharging device is respectively connected to the external DC power supply unit (2) and the storage battery pack, and an overhaul personnel overhauls the storage battery pack online inversion charging and discharging device.
7. The online inversion charge-discharge device of the storage battery pack according to claim 6, wherein the charge-discharge control unit (11) comprises an MCU, a cooling fan, a first fly-wheel diode D1, a second fly-wheel diode D2, a normally closed contactor K1, a first normally open contactor K2, a second normally open contactor K3, a third normally open contactor K4, a first fuse FU1, a second fuse FU2 and a third fuse FU3; MCU is connected in outside DC power supply unit (2), for the MCU power supply, radiator fan's input is connected to MCU's output, constitute the afterflow circuit after first freewheeling diode D1 and second freewheeling diode D2 are parallelly connected, radiator fan is the afterflow circuit heat dissipation, storage battery's positive terminal is connected respectively to the input of afterflow circuit, normally closed contactor K1 and second normally open contactor K3, the positive terminal of outside DC power supply unit (2) is connected respectively to the output of afterflow circuit, MCU, normally closed contactor K1 and first normally open contactor K2, connect precharge unit (134) after first normally open contactor K2 establishes ties with first fuse FU1, precharge unit (134) and contravariant discharge unit (131) are connected respectively after second normally open contactor K3 establishes ties with second fuse FU2, connect contravariant discharge unit (131) after third normally open contactor K4 establishes ties with third fuse FU 3.
8. The storage battery pack online inversion charging and discharging device according to claim 7, wherein when the storage battery pack discharges, the storage battery pack online inversion charging and discharging device performs self-checking operation, and the self-checking operation comprises the following specific steps: the main control unit (12) is firstly communicated with the storage battery pack monitoring unit (15), the charging and discharging control unit (11), the feeding protection unit (132), the inversion monitoring unit (133) and the inversion discharging unit (131) respectively, and then whether the working states of the storage battery pack monitoring unit (15), the charging and discharging control unit (11), the feeding protection unit (132), the inversion monitoring unit (133) and the inversion discharging unit (131) are all normal or not is judged in sequence, if yes, the main control unit (12) sends a discharging instruction to the storage battery pack, and the storage battery pack discharges; otherwise, the main control unit (12) does not send a discharge instruction to the storage battery pack, and the storage battery pack does not discharge.
9. The online inversion charge-discharge device of the storage battery pack according to claim 7, wherein the pre-charge unit (134) is provided with an IGBT power tube, the source electrode of the IGBT power tube is connected with the first fuse FU1 of the charge-discharge control unit (11), the emitter electrode of the IGBT power tube is connected with the second fuse FU2 of the charge-discharge control unit (11), the grid electrode of the IGBT power tube is connected with the main control unit (12), and the main control unit (12) drives the IGBT power tube by using a pulse width modulation technology to control the charge current of the storage battery pack.
10. The online inversion charging and discharging device for the storage battery pack according to any one of claims 3 to 9, wherein the inversion discharging unit (131) comprises an EMI filter, a DC/DC current stabilizing circuit, an LLC isolation converter, an inverter circuit, a filtering surge protection circuit, a DSP digital control chip, a current control chip and an LLC control chip;
the output end of the charge and discharge control unit (11) is connected with the input end of an EMI filter, the output end of the EMI filter is connected with the input end of a DC/DC current stabilizing circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charge and discharge control unit (11), the direct current enters a DC/DC current stabilizing circuit through filtering of the EMI filter, the output end of the DC/DC current stabilizing circuit is connected with the input end of an LLC (logical link control) isolation converter, the filtered direct current is stabilized through the DC/DC current stabilizing circuit and is input into the LLC isolation converter, the LLC isolation converter inverts the direct current into three-phase alternating current, the output end of the LLC isolation converter is connected with the input end of an inverter circuit, the output end of the inverter circuit is connected with the input end of a filtering surge protection circuit, the three-phase alternating current output by the LLC isolation converter is input into the filtering surge protection circuit after the voltage is adjusted through the inverter circuit, and the filtering surge protection circuit protects the electric energy quality of the three-phase alternating current output by the inverter circuit;
the output end of the DSP digital control chip is respectively connected with the input end of the current control chip, the input end of the LLC control chip and the input end of the inverter circuit, the DSP digital control chip respectively controls the working states of the current control chip, the LLC control chip and the inverter circuit, the current control chip is bidirectionally connected with the DC/DC current stabilizing circuit to control the working state of the DC/DC current stabilizing circuit, and the LLC control chip is bidirectionally connected with the LLC isolation converter to control the working state of the LLC isolation converter.
CN202310233571.9A 2023-03-13 2023-03-13 Online contravariant charge-discharge device of storage battery Active CN115954991B (en)

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CN214201710U (en) * 2020-12-30 2021-09-14 辽宁豪聚科技有限公司 Novel storage battery remote maintenance system
CN115184817A (en) * 2022-08-22 2022-10-14 国网黑龙江省电力有限公司七台河供电公司 Storage battery online monitoring system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170187207A1 (en) * 2015-07-21 2017-06-29 Bsb Power Company Ltd Collecting module, new lead-acid battery, charge and discharge control device and intelligent battery
CN107346907A (en) * 2016-05-06 2017-11-14 宝沃汽车(中国)有限公司 A kind of battery bag maintenance system and battery bag maintaining method
CN111725867A (en) * 2020-06-24 2020-09-29 国网湖北省电力有限公司孝感供电公司 Remote automatic maintenance system and maintenance method for storage battery
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