CN115954991B - Online contravariant charge-discharge device of storage battery - Google Patents
Online contravariant charge-discharge device of storage battery Download PDFInfo
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Abstract
The invention provides an on-line inversion charging and discharging device of a storage battery, which relates to the technical field of charging and discharging management of the storage battery, and comprises the following components: the device comprises a charge and discharge control unit, a main control unit, a charge and discharge maintenance unit and a storage battery monitoring unit; the charge-discharge control unit receives the instruction of the main control unit, controls the charge-discharge state of the storage battery pack, and uploads the storage battery pack data in the charge-discharge state to the main control unit; the charge and discharge maintenance unit is connected with the charge and discharge control unit and used for maintaining the charge and discharge state of the storage battery pack; the main control unit is connected with the charge and discharge maintenance unit and monitors the working state of the charge and discharge 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 charging and discharging maintenance work of the storage battery is improved.
Description
Technical Field
The invention relates to the technical field of storage battery pack charge and discharge management, in particular to an on-line inversion charge and discharge device of a storage battery pack.
Background
The storage battery is used as a backup power supply of a direct current system of the power transformer substation and is in a floating charge state for a long time, electrochemical substances in the storage battery are crystallized due to the long-term floating charge state, the internal resistance is increased, the capacity and the service life of the battery are influenced, and in order to ensure the state of charge and the health degree of the storage battery, the storage battery is required to be separated from the system and a charge and discharge test is carried out to verify the state of charge and the health degree of the storage battery.
At present, the charge and discharge test of the storage battery pack mainly depends on the periodic operation of maintenance personnel, but the number of the power substations is large, the distribution is wide, a large amount of personnel and equipment are required to be input in the periodic maintenance, the input cost is high, the manual maintenance is required to detect the storage battery pack in an electrified mode, and potential safety hazards of electrified operation exist; the equipment for discharging the storage battery pack by maintainers is a load mainly comprising a heating resistor, the electric energy of the battery is consumed by the load in a heating mode, and a large amount of heat is generated during maintenance, so that the direct current system of the power transformer substation has great potential safety hazard; the prior 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 discharging instruction sent by a server, the main controller controls the tri-state charger to switch from a floating charging state to a charging state until the backup storage battery pack is full, then controls the tri-state charger to switch to a discharging state so as to utilize the backup storage battery pack to perform short-time pre-discharge on a direct current load, after the short-time pre-discharge is not abnormal and normally ended, controls the feed network inverter to switch from a standby state to a working state so as to perform inversion discharge on the backup storage battery pack, but the storage battery pack charging and discharging system consists of the main controller, the tri-state charger and the feed network inverter, and in the whole charging and discharging process of the storage battery pack, the tri-state charger is controlled only by the main controller to switch the charging and discharging state of the storage battery pack, so that the charging and discharging maintenance process is strong in mechanical property and poor in flexibility, and the charging and discharging management control of the storage battery pack is insufficient, and the charging and discharging process of the storage battery pack cannot be comprehensively maintained.
Disclosure of Invention
In order to solve the problems of excessive mechanical property and poor flexibility of charge-discharge maintenance work of a storage battery in the current storage battery charge-discharge management system, the invention provides an online inversion charge-discharge device of the storage battery, which reduces the mechanical property of the charge-discharge maintenance work of the storage battery and improves the flexibility of the charge-discharge maintenance work of the storage battery.
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, which is used for charging and discharging the storage battery pack of a transformer substation, comprises: the charging and discharging control unit, the main control unit and the charging and discharging maintenance unit;
the input end of the charge-discharge control unit is connected with the positive end of the storage battery, the output end of the charge-discharge control unit is connected with the negative end of the storage battery, the charge-discharge control unit receives instructions of the main control unit, controls the storage battery to enter a floating charge state, a discharging state and a charging state, and uploads storage battery data in the floating charge state, the discharging state and the charging state to the main control unit, and further uploads the storage battery data to the remote control platform through the main control unit;
the charging and discharging maintenance unit is connected with the charging and discharging control unit, and maintains the working state of the storage battery pack in the floating charging, discharging and charging processes when the charging and discharging control unit controls the storage battery pack to enter the floating charging, discharging and charging states; the main control unit is connected with the charge and discharge maintenance unit and monitors the working state of the charge and discharge maintenance unit.
Preferably, the on-line inversion charging and discharging device of the storage battery further comprises an acquisition module and a storage battery monitoring unit, wherein the output end of the acquisition module is connected with the input end of the storage battery monitoring unit, the output end of the storage battery monitoring unit is connected with a main control unit, the storage battery monitoring unit acquires single-battery data of the storage battery in floating charge, discharging and charging states through the acquisition module, the single-battery data of the storage battery in the floating charge, discharging and charging states is uploaded to the main control unit, the main control unit is connected with a remote control platform, and the collected storage battery data and the collected single-battery data are transmitted to the remote control platform.
Preferably, the single battery data includes voltage, temperature and internal resistance of 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-charging unit;
the charging and discharging control unit receives a discharging instruction of the main control unit, controls the storage battery pack to enter a discharging state from a daily floating state, and transmits direct current to the charging and discharging control unit, wherein 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 feed protection unit, the output end of the feed 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 feed 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 discharging unit, the feed protection unit and the inversion monitoring unit for monitoring the working states of the inversion discharging unit, the feed protection unit and the inversion monitoring unit;
after the storage battery pack is discharged, the main control unit starts a precharge command, the output end of the main control unit is connected with the input end of the precharge unit, the output end of the precharge unit is connected with the input end of the charge-discharge control unit, the main control unit drives the precharge unit to precharge the storage battery pack, after the storage battery pack is precharged, the main control unit issues the charge command to the charge-discharge control unit through the precharge unit, and the charge-discharge control unit controls the storage battery pack to formally enter a charge state from a discharge state.
Preferably, the on-line inversion charging and discharging device of the storage battery further comprises a man-machine interaction unit and an indication unit, wherein the man-machine interaction unit and the indication unit are connected with the main control unit, the man-machine interaction unit is used for displaying storage battery 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-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-discharge control unit, the charge-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, if the storage battery on-line inversion charge-discharge device breaks down, the overhaul switch is closed, the external direct current power supply unit and the storage battery form a direct current loop, the external direct current power supply unit only supplies power for the storage battery in a direct current mode, the storage battery on-line inversion charge-discharge device is disconnected with the external direct current power supply unit and the storage battery respectively, and an overhaul worker overhauls the storage battery on-line inversion charge-discharge device.
Preferably, the charge-discharge control unit comprises an MCU, a radiator 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; the external direct current power supply unit is connected with the MCU to supply power for the MCU, the output end of the MCU is connected with the input end of the cooling fan, the first freewheeling diode D and the second freewheeling diode D are connected in parallel to form a freewheeling circuit, the cooling fan dissipates heat for the freewheeling circuit, the input end of the freewheeling circuit is respectively connected with the positive end of the storage battery, the normally-closed contactor K and the second normally-open contactor K, the output end of the freewheeling circuit is respectively connected with the positive end of the external direct current power supply unit, the MCU, the normally-closed contactor K and the first normally-open contactor K, the first normally-open contactor K is connected with the first fuse FU in series and then is connected with the precharge unit, the second normally-open contactor K is connected with the second fuse FU in series and then is connected with the precharge unit and the inversion discharge unit, and the third normally-open contactor K is connected with the third fuse FU in series and then is connected with the inversion discharge unit.
Preferably, when the storage battery pack is discharged, the storage battery pack on-line inversion charging and discharging device executes self-checking work, and the specific steps of the self-checking work are as follows: the main control unit is respectively communicated with the storage battery monitoring unit, the charge and discharge control unit, the feed protection unit, the inversion monitoring unit and the inversion discharging unit, and then sequentially judges whether the working states of the storage battery monitoring unit, the charge and discharge control unit, the feed protection unit, the inversion monitoring unit and the inversion discharging unit are all normal or not, if yes, the main control unit issues an electricity instruction to the storage battery, and the storage battery is discharged; otherwise, the main control unit does not issue an electricity 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, a source electrode of the IGBT power tube is connected with a first fuse FU of the charging and discharging control unit, an emitting electrode of the IGBT power tube is connected with a second fuse FU of the charging and discharging control unit, a 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 charging current of the storage battery pack.
Preferably, the inversion discharging unit comprises an EMI filter, a DC/DC current stabilizing circuit, an LLC isolation converter, an inversion 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-discharge control unit is connected with the input end of the EMI filter, the output end of the EMI filter is connected with the input end of the DC/DC steady-flow circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charge-discharge control unit, the direct current enters the DC/DC steady-flow circuit through the filtering of the EMI filter, the output end of the DC/DC steady-flow circuit is connected with the input end of the LLC isolation converter, the filtered direct current is stabilized by the DC/DC steady-flow 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 the inversion circuit, the output end of the inversion circuit is connected with the input end of the 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 adjustment by the inversion circuit, and the filtering surge protection circuit protects the electric energy quality of the three-phase alternating current output by the inversion 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 on-line inversion charging and discharging device for a storage battery, wherein a charging and discharging control unit receives an instruction of a main control unit, controls the storage battery to enter floating charging, discharging and charging states, realizes control of floating charging, discharging and charging processes of the storage battery, transmits storage battery data in the floating charging, discharging and charging states back to the main control unit for automatic management control, and further uploads the storage battery data to a remote control platform through the main control unit, so that the charging and discharging maintenance work of the storage battery can be conveniently and comprehensively managed remotely, and then under the control of the main control unit, the charging and discharging control unit maintains the working state of the storage battery in the floating charging, discharging and charging processes through driving the charging and discharging maintenance unit, so that the mechanical property of the 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.
Drawings
Fig. 1 shows a schematic structural diagram of an on-line inversion charging and discharging device for a storage battery set according to an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of an on-line inverter charge-discharge device for a storage battery set according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of the operation of the inverter discharge unit according to the embodiment of the present invention;
fig. 4 shows a communication connection diagram of an on-line inversion charging and discharging device of a storage battery set according to an embodiment of the present invention;
1. an on-line inversion charging and discharging device of the storage battery pack; 11. a charge-discharge control unit; 12. a main control unit; 13. a charge-discharge maintenance unit; 131. an inversion discharging unit; 132. a feed protection unit; 1321. a feed switch; 1322. a bi-directional filter; 133. an inversion monitoring unit; 134. a precharge unit; 14. an acquisition module; 15. a battery pack monitoring unit; 16. a man-machine interaction unit; 17. an indication unit; 18. an overhaul switch; 19. an auxiliary power supply unit; 2. an external DC power supply unit; 21. a direct current load; 22. a DC power supply.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for better illustrating the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions, and the description of the directions of the parts such as "up" and "down" is not limiting of the present patent;
it will be appreciated by those skilled in the art that some well known descriptions in the figures may be omitted;
the positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent;
the technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1, this embodiment proposes an online inversion charging and discharging device 1 for a storage battery pack, which is used for charging and discharging the storage battery pack of a transformer 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-discharge control unit 11 is connected with the positive end of the storage battery, the output end of the charge-discharge control unit 11 is connected with the negative end of the storage battery, the charge-discharge control unit 11 receives the instruction of the main control unit 12, controls the storage battery to enter a floating charge state, a discharging state and a charging state, and uploads the storage battery data in the floating charge state, the discharging state and the charging state to the main control unit 12, and further uploads the storage battery data to a remote control platform through the main control unit 12;
the charge-discharge maintenance unit 13 is connected with the charge-discharge control unit 11, and maintains the working state of the storage battery pack in the float charge, discharge and charge processes when the charge-discharge control unit 11 controls the storage battery pack to enter the float charge, discharge and charge states; the main control unit 12 is connected with the charge and discharge maintenance unit 13, and monitors the working state of the charge and discharge maintenance unit 13.
The on-line inversion charging and discharging device 1 of the storage battery further comprises an acquisition module 14 and a storage battery monitoring unit 15, wherein the output end of an acquisition module 14 block is connected with the input end of the storage battery monitoring unit 15, the output end of the storage battery monitoring unit 15 is connected with a main control unit 12, the storage battery monitoring unit 15 acquires single-battery data of the storage battery in floating charge, discharging and charging states through the acquisition module 14 block, the single-battery data of the storage battery in the floating charge, discharging and charging states is uploaded to the main control unit 12, the main control unit 12 is connected with a remote control platform, the collected storage battery 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-battery in the storage battery; the battery pack data includes a voltage and a current of the battery pack.
The charge-discharge maintenance unit 13 includes an inversion discharge unit 131, a feed protection unit 132, an inversion monitoring unit 133, and a precharge 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 state, and transmits direct current to the charging and discharging control unit 11, wherein 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 grid of a transformer substation after being monitored by the inversion monitoring unit 133;
the main control unit 12 is further connected to the inverter discharging unit 131, the feed protection unit 132 and the inverter monitoring unit 133, respectively, for monitoring the working states of the inverter discharging unit 131, the feed protection unit 132 and the inverter monitoring unit 133;
after the discharging of the storage battery pack is finished, the main control unit 12 starts a precharge command, the output end of the main control unit 12 is connected with the input end of the precharge unit 134, the output end of the precharge unit 134 is connected with the input end of the charge-discharge control unit 11, the main control unit 12 drives the precharge unit 134 to precharge the storage battery pack, after the precharging of the storage battery pack is finished, the main control unit 12 issues a charge command to the charge-discharge control unit 11 through the precharge unit 134, and the charge-discharge control unit 11 controls the storage battery pack to formally enter a charge state from a discharge state.
The on-line inversion charging and discharging device 1 of the storage battery pack further comprises a man-machine interaction unit 16 and an indication unit 17, wherein the man-machine interaction unit 16 and the indication unit 17 are connected with the main control unit 12, the man-machine 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 charge and discharge control unit 11 and the main control unit 12 are connected with an auxiliary power supply unit 19, and the external direct current power supply unit 2 supplies power to the charge and discharge control unit 11 and the main control unit 12 through the auxiliary power supply unit 19 respectively;
the input end of the charge-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-discharge control unit 11, the charge-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, if the storage battery online inversion charge-discharge device 1 breaks down, the overhaul switch 18 is closed, the external direct-current power supply unit 2 and the storage battery form a direct-current loop, the external direct-current power supply unit 2 only supplies power for the storage battery, the storage battery online inversion charge-discharge device 1 is disconnected with the external direct-current power supply unit 2 and the storage battery respectively, and an overhaul worker overhauls the storage battery online inversion charge-discharge device 1, 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-discharge control unit receives the instruction of the main control unit, controls the storage battery to enter into the floating charge, discharge and charge states, realizes the control of the floating charge, discharge and charge processes of the storage battery, and transmits the storage battery data in the floating charge, discharge and charge states back to the main control unit for automatic management control, and further uploads the storage battery data to the remote control platform through the main control unit, so that the charge-discharge maintenance work of the storage battery can be managed remotely and comprehensively.
Example 2
Referring to fig. 1 and 2, the charge/discharge control unit 11 includes an MCU, a cooling 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; the external direct current power supply unit 2 is connected with the MCU to supply power for the MCU, wherein an auxiliary power supply unit 19 is arranged between the external direct current power supply unit 2 and the MCU, the auxiliary power supply unit 19 reduces the voltage of direct current of the external direct current power supply unit 2, direct current in rated voltage provided by the MCU is supplied to the MCU, the output end of the MCU is connected with the input end of a cooling fan, the first freewheeling diode D1 and the second freewheeling diode D2 are connected in parallel to form a freewheeling circuit, the cooling fan dissipates heat for the freewheeling circuit, the input end of the freewheeling circuit is respectively connected with the positive end of a storage battery, the normally closed contactor K1 and the second normally open contactor K3, the output end of the freewheeling circuit is respectively connected with the positive end of the external direct current power supply unit 2, the MCU, the normally closed contactor K1 and the first normally open contactor K2, the first normally open contactor K2 is connected with the pre-charging unit 134 after the first fuse FU1 is connected in series, the second normally open contactor K3 is connected with the second fuse FU2 in series to the pre-charging unit 134 and the inverting discharge unit 131 respectively, and the third normally open contactor K4 is connected with the inverting unit 131 after the third fuse FU3 is connected in series.
When the charge-discharge control unit 11 controls the storage battery pack to be switched to a floating charge state, K5 in the maintenance switch 18 is in an open state, K1 of the charge-discharge control unit 11 is in a closed state, the positive electrode end A of the external direct current power supply unit is connected with the positive electrode end B of the storage battery pack through a normally closed contactor K1 of the charge-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 is discharged, the storage battery pack on-line inversion charging and discharging device 1 executes self-checking work, and the specific steps of the self-checking work are as follows: the main control unit 12 communicates with the storage battery monitoring unit 15, the charge and discharge control unit 11, the feed 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 monitoring unit 15, the charge and discharge control unit 11, the feed protection unit 132, the inversion monitoring unit 133 and the inversion discharging unit 131 are all normal or not, if yes, the main control unit 12 issues an electricity instruction to the storage battery, and the storage battery discharges; otherwise, the main control unit 12 does not issue an electrical command to the battery pack, and the battery pack does not discharge.
When the on-line inversion charging and discharging device 1 of the storage battery performs self-inspection, the main control unit 12 communicates with the storage battery monitoring unit 15 to obtain single-battery data of the storage battery monitored by the storage battery monitoring unit 15, wherein the single-battery data comprises the voltage, the temperature and the internal resistance of a single battery in the storage battery, and whether the actual single-battery data monitored by the storage battery monitoring unit 15 is smaller than the monitoring alarm value of the single-battery data set by the storage battery monitoring unit 15 is judged, if yes, the working state of the storage battery monitoring unit 15 is normal, otherwise, the working state of the storage battery monitoring unit 15 is abnormal;
the main control unit 12 communicates with the charge and discharge control unit 11 to respectively acquire direct current power supply data and storage battery pack data acquired by the charge and discharge control unit 11, wherein the storage battery pack data comprises voltage and current of a storage battery pack; the direct current power supply data comprise the voltage and the current of a direct current power supply, if the actual direct current power supply data acquired by the charge-discharge control unit 11 are smaller than the direct current power supply parameter threshold value set by the charge-discharge control unit 11, the actual storage battery data acquired by the charge-discharge control unit 11 are smaller than the storage battery parameter threshold value set by the charge-discharge control unit 11, and meanwhile, the normally closed contactor K1, the first normally open contactor K2, the second normally open contactor K3, the third normally open contactor K4, the first freewheeling diode D1 and the second freewheeling diode D2 of the charge-discharge control unit 11 are normal, and if not, the working state of the charge-discharge control unit 11 is abnormal;
the feed protection unit 132 is connected with a lightning arrester, the feed protection unit 132 is provided with a feed switch 1321 and a bidirectional filter 1322 which are sequentially connected, the main control unit 12 communicates with the feed protection unit 132, if the lightning arrester and the bidirectional filter 1322 have no alarm state, and meanwhile, the feed switch 1321 is in a closed state, the working state of the feed protection unit 132 is normal, otherwise, the working state of the feed protection unit 132 is abnormal;
the main control unit 12 communicates with the inverter monitoring unit 133 connected with the alternating current power grid of the transformer substation to obtain a load value of the alternating current power grid of the transformer substation monitored by the inverter monitoring unit 133, if the actual load value of the alternating current power grid of the transformer substation monitored by the inverter monitoring unit 133 is larger than a load alarm value of the alternating current power grid arranged in the inverter monitoring unit 133, the working state of the inverter monitoring unit 133 is normal, otherwise, the working state of the inverter monitoring unit 133 is abnormal;
the main control unit 12 communicates with the inverter discharging unit 131 provided with an inverter, if the inverter works normally, the working state of the inverter discharging unit 131 is normal, otherwise, the working state of the inverter discharging unit 131 is abnormal;
after the self-checking work is finished, the charge-discharge control unit 11 detects whether the states of the relay node, the radiator temperature, the first freewheeling diode D1 and the second freewheeling diode D2 are abnormal or not, and sends the states of the relay node, the radiator temperature, the first freewheeling diode D1 and the second freewheeling diode D2 to the main control unit 12, at the moment, K5 is in an open state, the normally closed contactor K1 of the charge-discharge control unit 11 is open, the first normally open contactor K2 is open, the second normally open contactor K3 and the third normally open contactor K4 are closed, the main control unit 12 controls the charge-discharge control unit 11 to act, the storage battery pack is separated from the external direct current power supply unit 2 and is connected with the direct current input end of the inversion discharging unit 131, the inversion discharging unit 131 inverts the direct current of the storage battery pack into three-phase alternating current according to the set voltage and current parameters, the three-phase alternating current sequentially passes through the feed protection unit 132 and the inversion monitoring unit 133 to be conveyed into the alternating current power grid of a transformer substation, the load in the alternating current power grid is provided, the bidirectional filtering function of the feed unit 132 prevents the electric energy pollution of the inverter, and can prevent the influence of the power grid of the clutter of the commercial power supply from influencing the main control unit 11, and the main control unit 12 can be prevented from being cut off in time, the abnormal quality is protected when the main control unit 12 is stably sends the power to the inversion monitoring unit 12, and the abnormal quality can be protected to the main control unit is protected; the external direct current power supply unit 2 loses voltage 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 freewheeling diode D1 and the second freewheeling diode D2, the unidirectional conductivity 0 time delay of the first freewheeling diode D1 and the second freewheeling diode D2 is utilized, the external direct current power supply unit 2 is ensured not to lose voltage, at the moment, the cooling fans of the first freewheeling diode D1 and the second freewheeling diode D2 can be automatically started, the good overcurrent capacity of the first freewheeling diode D1 and the second freewheeling 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 on-line inversion charging and discharging device 1 of the storage battery is maintained, the direct-current power supply 22 and the storage battery direct current are directly closed for K5, and the on-line inversion charging and discharging device 1 of the storage battery can be maintained.
Referring to fig. 3, in order to ensure reliable operation of the on-line inversion charging and discharging device 1 of the storage battery set provided in this embodiment, a main chip of the main control unit 12 adopts STM32F767, and is provided with 10 paths of serial ports (UARTs), 12 paths of open/close dry contacts, wherein operation and fault indication of the indication unit 17 adopt an IO port for driving, the IO port is controlled to input and drive locally and remotely, an IO port is controlled automatically, an emergency stop signal adopts switching value to change from IO to input and drive, and the man-machine interaction unit 16 uses serial port communication control. UART1 communicates with the feed protection unit 132, UART4 communicates with the inversion monitoring unit 133, UART2 communicates with the charge/discharge control unit 11, UART3 communicates with the battery pack monitoring unit 15, UART5 communicates with the ICE68150 in tandem, UART7 communicates with the remote control platform, UART6 communicates with the inversion discharging 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 of the IGBT power tube is connected to the first fuse FU1 of the charge/discharge control unit 11, an emitter of the IGBT power tube is connected to the second fuse FU2 of the charge/discharge control unit 11, a gate 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 the charging current of the storage battery.
When the discharging of the storage battery pack is finished and needs to be charged, the K5 is in an open state, the normally closed contactor K1 of the charging and discharging control unit 11 is opened, the first normally open contactor K2, the second normally open contactor K3 and the third normally open contactor K4 are all closed, the positive electrode of the external direct current power supply unit 2 pre-charges the storage battery pack through the IGBT power tube of the pre-charging unit 134, the direct charging can cause the impact of the storage battery and the external direct current power supply unit 2 due to the fact that the voltage difference between the external direct current power supply unit 2 and the storage battery pack is too large, 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, the main control unit 12 directly controls the IGBT power tube of the pre-charging unit 134 to be conducted, 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 opened, and the charging and discharging control unit 11 is in a standby state.
Referring to fig. 4, the inverter discharging unit 131 includes an EMI filter, a DC/DC current stabilizing circuit, an LLC isolated 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-discharge control unit 11 is connected with the input end of the EMI filter, the output end of the EMI filter is connected with the input end of the DC/DC steady-flow circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charge-discharge control unit 11, the direct current enters the DC/DC steady-flow circuit through the filtering of the EMI filter, the output end of the DC/DC steady-flow circuit is connected with the input end of the LLC isolation converter, the filtered direct current is stabilized through the DC/DC steady-flow 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 the inverter circuit, the output end of the inverter circuit is connected with the input end of the 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 regulated by 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, the LLC control chip is bidirectionally connected with the LLC isolation converter to control the working state of the LLC isolation converter; the specific process of converting the direct current into the three-phase alternating current in the inversion discharging unit 131 is as follows: the direct current of the storage battery pack is input into an EM1 filter through a charge-discharge control unit, the direct current is filtered through the EM1 and enters a DC/DC steady-flow circuit, and a DSP digital control chip drives the DC/DC steady-flow circuit to control the discharge current in real time through the current control chip according to the set discharge current value of the storage battery pack in combination with the current sampling value; meanwhile, the DSP digital control chip drives the LLC control chip according to the discharge setting condition, the direct current output by the DC/DC is inverted into alternating current output through the LLC isolation converter, the inverter circuit is controlled by the DSP digital chip to adjust the alternating current output voltage to output three-phase alternating current to the filtering surge protection circuit, and the filtering surge protection circuit ensures the electric energy quality of the three-phase alternating current output.
It is to be understood that the above examples of the present invention are provided by way of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
1. An online contravariant charge-discharge device of storage battery for charge-discharge maintenance is carried out to the storage battery of transformer substation, its characterized in that 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-discharge control unit (11) is connected with the positive end of the storage battery, the output end of the charge-discharge control unit (11) is connected with the negative end of the storage battery, the charge-discharge control unit (11) receives an instruction of the main control unit (12) to control the storage battery to enter a floating charge state, a discharging state and a charging state, and the storage battery data in the floating charge state, the discharging state and the charging state are uploaded to the main control unit (12) and further uploaded to a remote control platform through the main control unit (12);
the charging and discharging maintenance unit (13) is connected with the charging and discharging control unit (11), and maintains the working state of the storage battery pack in the floating charging, discharging and charging processes when the charging and discharging control unit (11) controls the storage battery pack to enter the floating charging, discharging and charging states; the main control unit (12) is connected with the charge and discharge maintenance unit (13) and monitors the working state of the charge and discharge maintenance unit (13); the charging and discharging maintenance unit (13) comprises an inversion and discharging unit (131), a feed 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), the storage battery pack is controlled 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 monitored by the inversion monitoring unit (133) and then is input into an alternating current grid of a transformer substation;
the main control unit (12) is also respectively connected with the inversion discharging unit (131), the feed protection unit (132) and the inversion monitoring unit (133), and monitors the working states of the inversion discharging unit (131), the feed protection unit (132) and the inversion monitoring unit (133);
after the discharge of the storage battery pack is finished, the main control unit (12) starts a precharge command, the output end of the main control unit (12) is connected with the input end of the precharge unit (134), the output end of the precharge unit (134) is connected with the input end of the charge-discharge control unit (11), the main control unit (12) drives the precharge unit (134) to precharge the storage battery pack, after the precharge of the storage battery pack is finished, the main control unit (12) issues a charge command to the charge-discharge control unit (11) through the precharge unit (134), and the charge-discharge control unit (11) controls the storage battery pack to formally enter a charge state from a discharge state.
2. The on-line inversion charging and discharging device for the storage battery pack according to claim 1, further comprising 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 a main control unit (12), the storage battery pack monitoring unit (15) acquires single battery data of the storage battery pack in floating charge, discharging and charging states through the acquisition module (14) and uploads the single battery data of the storage battery pack in the floating charge, discharging and charging states to the main control unit (12), the main control unit (12) is connected with a remote control platform, and the collected storage battery data and the single battery data are transmitted to the remote control platform.
3. The battery pack on-line inversion charge-discharge device according to claim 2, wherein the single cell data includes voltage, temperature and internal resistance of single cells in the battery pack; the battery pack data includes a voltage and a current of the battery pack.
4. The on-line inversion charging and discharging device for the storage battery pack according to claim 3, further comprising a man-machine interaction unit (16) and an indication unit (17), wherein the man-machine interaction unit (16) and the indication unit (17) are connected with the main control unit (12), the man-machine 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).
5. The on-line inversion charging and discharging device for the storage battery pack according to claim 4, wherein the input end of the charging and discharging 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 charging and discharging control unit (11), the charging and discharging 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 on-line inversion charging and discharging device for 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 power for the storage battery pack, and the on-line inversion charging and discharging device for the storage battery pack is disconnected with the external direct current power supply unit (2) and the storage battery pack respectively.
6. The battery pack on-line inversion charge-discharge device according to claim 5, wherein the charge-discharge control unit (11) includes an MCU, a radiator fan, a first flywheel diode D1, a second flywheel 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; the external direct current power supply unit (2) is connected with the MCU to supply power for the MCU, the output end of the MCU is connected with the input end of a cooling fan, a first follow current diode D1 and a second follow current diode D2 are connected in parallel to form a follow current circuit, the cooling fan dissipates heat for the follow current circuit, the input end of the follow current circuit is respectively connected with the positive end of the storage battery pack, the normally closed contactor K1 and the second normally open contactor K3, the output end of the follow current circuit is respectively connected with the positive end of the external direct current power supply unit (2), the MCU, the normally closed contactor K1 and the first normally open contactor K2, the first normally open contactor K2 is connected with the first fuse FU1 in series and then is connected with the pre-charging unit (134), the second normally open contactor K3 is connected with the second fuse FU2 in series and then is respectively connected with the pre-charging unit (134) and the inversion discharging unit (131), and the third normally open contactor K4 is connected with the third fuse FU3 in series and then is connected with the inversion discharging unit (131).
7. The on-line inversion charging and discharging device of a storage battery pack according to claim 6, wherein when the storage battery pack is discharged, the on-line inversion charging and discharging device of the storage battery pack executes self-checking work, and the specific steps of the self-checking work are as follows: the main control unit (12) is respectively communicated with the storage battery monitoring unit (15), the charge and discharge control unit (11), the feed protection unit (132), the inversion monitoring unit (133) and the inversion discharging unit (131), and then sequentially judges whether the working states of the storage battery monitoring unit (15), the charge and discharge control unit (11), the feed protection unit (132), the inversion monitoring unit (133) and the inversion discharging unit (131) are all normal or not, if yes, the main control unit (12) issues an electric instruction to the storage battery, and the storage battery discharges; otherwise, the main control unit (12) does not issue an electricity instruction to the storage battery pack, and the storage battery pack does not discharge.
8. The on-line inversion charging and discharging device of the storage battery pack according to claim 6, wherein the pre-charging unit (134) is provided with an IGBT power tube, a source electrode of the IGBT power tube is connected with the first fuse FU1 of the charging and discharging control unit (11), an emitter electrode of the IGBT power tube is connected with the second fuse FU2 of the charging and discharging control unit (11), a gate 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 charging current of the storage battery pack.
9. The battery pack on-line inversion charge-discharge device according to any one of claims 3-8, wherein the inversion discharge unit (131) comprises an EMI filter, a DC/DC current stabilizing circuit, an LLC isolated converter, an inverter circuit, a filtered surge protection circuit, a DSP digital control chip, a current control chip, and an LLC control chip;
the output end of the charge-discharge control unit (11) is connected with the input end of the EMI filter, the output end of the EMI filter is connected with the input end of the DC/DC steady-flow circuit, when the storage battery pack discharges, direct current of the storage battery pack is input into the EMI filter through the charge-discharge control unit (11), the direct current enters the DC/DC steady-flow circuit through the filtering of the EMI filter, the output end of the DC/DC steady-flow circuit is connected with the input end of the LLC isolation converter, the filtered direct current is stabilized through the DC/DC steady-flow 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 the inversion circuit, the output end of the inversion circuit is connected with the input end of the 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 adjustment by the inversion circuit, and the filtering surge protection circuit protects the electric energy quality of the three-phase alternating current output by the inversion 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.
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| 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 |
| 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 |
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