CN112332514A - Storage battery charging and discharging control system and method - Google Patents
Storage battery charging and discharging control system and method Download PDFInfo
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- CN112332514A CN112332514A CN202011131536.9A CN202011131536A CN112332514A CN 112332514 A CN112332514 A CN 112332514A CN 202011131536 A CN202011131536 A CN 202011131536A CN 112332514 A CN112332514 A CN 112332514A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
Abstract
The application relates to a storage battery charging and discharging control system and a method, wherein the storage battery charging and discharging control system comprises: the monitoring terminal is electrically connected with the storage battery, the running state of the storage battery is monitored in real time, and the controller compares the running state parameters of the storage battery with the preset normal working parameters stored in the controller, so that whether the storage battery breaks down or not is determined. The control of the inverter to the discharge load under the condition that the storage battery does not break down controls the inverter to stop working under the condition that the storage battery breaks down, so that the automatic control of the storage battery is realized, the technical problems that workers need to be in a discharge site for a long time and consume manpower and time are avoided, the working efficiency is improved, and the technical effects of reducing labor cost are achieved.
Description
Technical Field
The application relates to the technical field of substation backup power supplies, in particular to a storage battery charging and discharging control system and method.
Background
At present, storage batteries are adopted in an operating power supply, a communication power supply, a machine room UPS of a power system transformer substation and backup power supplies of systems such as an energy storage power station, a photovoltaic power station, a communication base station and an electric automobile. The storage battery as a backup power supply is in a floating charge state at ordinary times, and due to the influence of the electrochemical characteristics of the storage battery, long-term floating charge causes the crystallization of electrochemical substances in the storage battery, the internal resistance is increased, and the capacity and the service life of the storage battery are influenced. Therefore, the battery in a float state needs to be maintained at regular time intervals, such as discharge, nuclear capacity, and activation.
At present, the storage battery is charged and discharged regularly mainly by manual operation, and workers regularly go to the site to overhaul, install discharge machine equipment and the like. In the discharging process, workers have to check the safety of the discharging of the storage battery in real time on site to determine the safety of the discharging of the storage battery, but the discharging time of the storage battery is long, and the workers need to stay on the discharging site for a long time, so that the labor and the time are consumed.
Disclosure of Invention
Therefore, it is necessary to provide a battery charging and discharging control system and method for solving the problems that the battery is discharged for a long time, and workers need to stay in a discharging site for a long time, which is labor and time consuming.
A battery charge-discharge control system comprising:
the input end of the charger is used for connecting a bus;
the input end of the storage battery is electrically connected with the output end of the charger;
the input end of the inverter is electrically connected with the output end of the storage battery, and the output end of the inverter is used for connecting a discharging load;
the monitoring terminal is electrically connected with the output end of the storage battery;
the input end of the controller is in signal connection with the monitoring terminal, the output end of the controller is in signal connection with the control end of the inverter, the controller is used for determining whether the storage battery has a fault according to the output signal of the monitoring terminal, controlling the inverter to discharge to the discharging load under the condition that the storage battery has no fault, and controlling the inverter to stop working under the condition that the storage battery has a fault.
In one embodiment, the controller is in signal connection with the charger, and the controller is further configured to control the storage battery to stop working and control the charger to stop charging the storage battery when the storage battery fails.
In one embodiment, the battery charge and discharge control system further includes a bus bar including:
the first bus is electrically connected with the input end of the charger;
a second bus bar;
the first end of the bus-coupled switch is electrically connected with the first bus, the second end of the bus-coupled switch is electrically connected with the second bus, and the bus-coupled switch is in a normally open position.
In one embodiment, the bus tie switch includes:
a first end of the manual bus coupler switch is electrically connected with the first bus, and a second end of the manual bus coupler switch is electrically connected with the second bus;
the controllable bus coupler switch is connected with the manual bus coupler switch in parallel, the control end of the controllable bus coupler switch is in signal connection with the controller, and the controller is used for controlling the on-off of the controllable bus coupler switch.
In one embodiment, the controllable bus coupler switch comprises a main contact and an auxiliary contact, the main contact is linked with the auxiliary contact, the main contact is connected with the manual bus coupler switch in parallel, the auxiliary contact is in signal connection with the controller, and the controller is used for switching on the controllable bus coupler switch under the condition that the storage battery has a fault.
In one embodiment, the method further comprises the following steps:
and the input end of the DC-DC converter is electrically connected with the first bus, and the output end of the DC-DC converter is electrically connected with the auxiliary contact and the controller respectively.
In one embodiment, the method further comprises the following steps:
and the remote control equipment is in signal connection with the controller.
A battery charge-discharge control method includes:
acquiring a first operating parameter of the storage battery;
determining a first state of health of the battery based on the first operating parameter;
if the first health state meets a preset condition, controlling the storage battery to discharge;
and if the first health state does not meet the preset condition, controlling the storage battery to stop discharging.
In one embodiment, the controlling the battery to discharge if the first state of health satisfies a predetermined condition includes:
if the first health state meets a preset condition, controlling the storage battery to discharge short-time direct-current load;
acquiring a second operating parameter of the storage battery;
determining a second state of health of the battery based on the second operating parameter;
if the second health state meets a preset condition, controlling the storage battery to carry out deep alternating current inversion discharge;
and if the second health state does not meet the preset condition, controlling the storage battery to stop discharging.
In one embodiment, the method further comprises the following steps:
and if the deep alternating current inversion discharge capacity of the storage battery exceeds a preset threshold value, controlling a charger to charge the storage battery.
The embodiment of the application provides a battery charge and discharge control system, includes: the monitoring terminal is electrically connected with the storage battery, the running state of the storage battery is monitored in real time, and the controller compares the running state parameters of the storage battery with the preset normal working parameters stored in the controller, so that whether the storage battery breaks down or not is determined. The control of the inverter to the discharge load under the condition that the storage battery does not break down controls the inverter to stop working under the condition that the storage battery breaks down, so that the automatic control of the storage battery is realized, the technical problems that workers need to be in a discharge site for a long time and consume manpower and time are avoided, the working efficiency is improved, and the technical effects of reducing labor cost are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery charge and discharge control system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery charge and discharge control system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a battery charge and discharge control system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a part of a battery charge and discharge control system according to an embodiment of the present application;
fig. 5 is a flowchart of a battery charging and discharging control method according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a battery charging and discharging control method according to an embodiment of the present application.
Description of reference numerals:
10. a battery charge-discharge control system; 100. a charger; 200. a storage battery; 300. an inverter; 400. monitoring a terminal; 500. a controller; 600. a bus bar; 610. a first bus bar; 620. a second bus bar; 630. a bus tie switch; 631. a manual bus coupler switch; 632. a controllable bus tie switch; 700. a DC-DC converter; 800. a display device; 900. and a remote control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, a battery charging and discharging control system and method of the present application are further described in detail below by embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, an embodiment of the present application provides a battery charging and discharging control system 10, which is applied to a backup dc system of a substation, and is used to control charging and discharging of a battery 200 in the backup dc system. The substation includes a plurality of busbars 600, and battery 200 gets electricity from a plurality of busbars 600. The following embodiment specifically describes the application of the battery charge and discharge control system 10 to a backup dc system of a substation as an example.
The embodiment of the present application provides a battery charge and discharge control system 10, including: charger 100, battery 200, inverter 300, monitoring terminal 400 and controller 500.
When the charger 100 is in use, the input end of the charger 100 is electrically connected with any one of the buses 600, and the charger 100 takes electricity from the buses 600 to charge the storage battery 200. The charger 100 may be a tri-state charger including three working states, i.e., a charging state, a zero-current output state, and a discharging state. Wherein, the output voltage of the charging state is 124.2V; the output voltage in the zero current output state is 108V, no current is output, and the zero current output state can be called as a zero power output state; the output voltage in the discharged state was 102.6V. The tri-state charger may provide different charging modes for the battery 200 to adapt to different working states of the battery 200. The tri-state charger is provided with a communication serial port and is communicated with other equipment such as the controller 500 through the serial port to realize the interaction between signals. The charger 100 may also be other types of chargers, such as a quick charger, and the like, in this embodiment, the number, the types, and the like of the chargers 100 are not limited at all, and may be specifically selected according to actual conditions, and only the function of charging the storage battery 200 may be satisfied.
The input end of the storage battery 200 is electrically connected with the output end of the charger 100, and the storage battery 200 is used for storing energy and storing the electric energy charged by the charger 100 for standby. The physical parameters of the battery 200, such as the voltage, ohmic internal resistance, polarization capacitance, charge capacity, state of health, and electrode temperature of the battery 200, change during operation. The voltage output by the storage battery 200 is direct current and can directly supply power to direct current equipment in a transformer substation. The battery 200 may be a single large-capacity battery or a battery pack formed by a plurality of batteries. The storage battery 200 may be any of a lead-acid storage battery, a lithium battery, and the like, and this embodiment is not limited at all, and may be specifically selected according to actual conditions, and only needs to satisfy the function of energy storage.
The input end of the inverter 300 is electrically connected to the output end of the battery 200, the output end of the inverter 300 is used for connecting to a discharging load, and the inverter 300 converts the direct current of the battery 200 into alternating current for the discharging load to use. In this embodiment, the inverter 300 may be a single-phase grid feeding inverter, the DC input rated voltage of the single-phase grid feeding inverter is DC110V, the operating voltage range is DC 98V-DC 143V, the AC output rated voltage is AC220V, the operating voltage range is AC 198V-AC 286V, and the output power is 3000VA, the single-phase grid feeding inverter is provided with a communication serial port, and communicates with other devices such as the controller 500 through the communication serial port to realize interaction between signals. The inverter 300 may also be any other device having an inverting function, and the inverter 300 may be specifically selected or set according to actual conditions without any limitation in this embodiment, and only needs to satisfy a function of converting the direct current output by the storage battery 200 into the alternating current for the discharging load.
The monitoring terminal 400 is electrically connected with the output end of the storage battery 200, and the monitoring terminal 400 is used for monitoring the working state of the storage battery 200. When the storage battery 200 works daily, the voltage, the ohmic internal resistance, the polarization capacitance, the charge quantity, the health state, the electrode temperature and the like of the storage battery 200 are all in a dynamic change process, and the monitoring terminal 400 acquires the physical parameters of the storage battery 200, such as the voltage, the current, the internal resistance, the temperature and the like, and determines the working state of the storage battery 200 according to the physical parameters. The monitoring terminal 400 may be composed of a plurality of multi-channel monitoring units, each monitoring unit has a communication function such as a PLC carrier, and each monitoring unit is connected to each battery signal in the storage battery 200, monitors physical parameters such as voltage, current, internal resistance, and temperature in real time, and transmits the physical parameters to the controller 500 for signal interaction through power line carrier communication. The monitoring terminal 400 may include a plurality of signal collectors for respectively collecting parameters such as voltage, current, internal resistance, and temperature of the storage battery 200, performing preliminary integration processing, and then transmitting the result to other devices such as the controller 500. In this embodiment, the monitoring terminal 400 is not specifically limited, and may be specifically selected or set according to actual conditions, and only needs to satisfy the function of monitoring the operating state of the storage battery 200.
The input end of the controller 500 is in signal connection with the monitoring terminal 400, the output end of the controller 500 is in signal connection with the control end of the inverter 300, and the controller 500 is configured to determine whether the battery 200 has a fault according to the output signal of the monitoring terminal 400, control the inverter 300 to discharge to the discharge load when the battery 200 has no fault, and control the inverter 300 to stop working when the battery 200 has a fault. The controller 500 is a control center of the battery charging and discharging control system 10 in this embodiment, and the controller 500 may include a plurality of communication ports, for example: RS232/485 serial communication interface, COM1 and COM2 serial ports, WIFI communication ports, GPRS communication ports, LAN interfaces of Ethernet communication, PLC carrier communication interfaces, switching value input/output I/O interfaces and the like. The controller 500 is connected to the positive electrode and the negative electrode of the storage battery 200 through a PLC carrier communication interface, and is connected to the serial port of the inverter 300 through a serial port COM2, so as to switch and control the operating state of the inverter 300 and read the operating state data of the storage battery 200. The controller 500 may be any one of a computer, a PLC chip, a mobile phone, and the like, and this embodiment is not limited at all, and may be specifically limited according to an actual situation, and only needs to satisfy a function of determining whether the storage battery 200 has a fault according to the output signal of the monitoring terminal 400, and controlling the inverter 300 to discharge the discharge load when the storage battery 200 has no fault.
The working principle of the battery charge and discharge control system 10 provided by the embodiment is as follows:
the battery charging and discharging control system 10 provided in this embodiment includes a charger 100, a battery 200, an inverter 300, a monitoring terminal 400, and a controller 500. The input end of the storage battery 200 is electrically connected with the charger 100, and the output end of the storage battery 200 is electrically connected with the inverter 300. When the charger 100 is used, electricity is taken from the bus 600 to charge the storage battery 200, and the inverter 300 converts direct current output by the storage battery 200 into alternating current for a discharging load. The monitoring terminal 400 is electrically connected to the storage battery 200 to monitor the operation state of the storage battery 200 in real time, and the controller 500 compares the operation state parameters of the storage battery 200 with the preset normal operation parameters stored in the controller 500 to determine whether the storage battery 200 has a fault. When the storage battery 200 is not in fault, the inverter 300 is controlled to discharge to the discharge load, and when the storage battery 200 is abnormal, the inverter 300 is stopped to operate, so that the inverter 300 is stopped to discharge to the discharge load, and a worker waits for field maintenance.
The present embodiment provides a battery charge and discharge control system 10, including: the monitoring terminal 400 and the controller 500 are arranged, the monitoring terminal 400 is electrically connected with the storage battery 200 to monitor the running state of the storage battery 200 in real time, and the controller 500 compares the running state parameters of the storage battery 200 with the preset normal working parameters stored in the controller 500 to determine whether the storage battery 200 fails. The control of the inverter 300 to discharge to the discharge load is performed under the condition that the storage battery 200 does not have a fault, and the control of the inverter 300 to stop working is performed under the condition that the storage battery 200 has a fault, so that the automatic control of the storage battery 200 is realized, the technical problems that workers need to be in a discharge site for a long time and consume manpower and time are solved, and the technical effects of improving the working efficiency and reducing the labor cost are achieved.
In one embodiment, the controller 500 is in signal connection with the charger 100 through a serial COM1, so as to realize switching control of the working state of the storage battery 200 and reading of the state parameter, and the controller 500 is further configured to control the storage battery 200 to stop working and control the charger 100 to stop charging the storage battery 200 when the storage battery 200 fails. When the storage battery 200 has a fault and the output voltage of the storage battery is unstable, the inverter 300 is immediately controlled to stop working, and the discharge to the discharge load is not continued any more, and meanwhile, the controller 500 controls the charger 100 to stop charging the storage battery 200 to wait for the staff to overhaul before.
Referring to fig. 2, in one embodiment, the bus bar 600 includes: a first bus bar 610, a second bus bar 620, and a buscouple switch 630.
A first end of the bus tie switch 630 is electrically connected to the first bus bar 610, a second end of the bus tie switch 630 is electrically connected to the second bus bar 620, and the bus tie switch 630 is in a normally open position. When the storage battery 200 works normally, the bus tie switch 630 is turned off, and the first bus 610 and the second bus 620 work independently without mutual influence. When one bus or the storage battery 200 connected to the bus has a fault, the bus can be switched to another bus, and power is taken from the standby storage battery of the other bus, so that the working stability of the storage battery charging and discharging control system 10 is improved.
In one embodiment, the buscouple switch 630 includes: a manual bus tie switch 631 and a controllable bus tie switch 632.
The first end of the manual bus coupling switch 631 is electrically connected with the first bus 610, and the second end of the manual bus coupling switch 631 is electrically connected with the second bus 620, so that the connection and switching between the first bus 610 and the second bus can be conveniently controlled manually when a fault occurs. The manual bus coupler switch 631 can be a common double-opening switch, a three-opening switch and the like, and the implementation is not limited at all and can be specifically selected according to actual needs.
The controllable bus coupler switch 632 is connected in parallel with the manual bus coupler switch 631 and is connected to the first bus 610 and the second bus 620. The control end of the controllable buscouple switch 632 is in signal connection with the controller 500, and the on-off of the controllable buscouple switch 632 is controlled by the controller 500. The controllable buscouple switch 632 includes a main contact 632a and an auxiliary contact 632b, the main contact 632a is linked with the auxiliary contact 632b, the main contact 632a is connected in parallel with the manual buscouple switch 631, the auxiliary contact 632b is in signal connection with the controller 500, and the controller 500 is configured to switch on the controllable buscouple switch 632 when the battery 200 fails. The controllable bus coupler switch 632 and the manual bus coupler switch 631 are connected in parallel and are both in a normally open position, and the two switches are simultaneously switched into a circuit, so that the working stability of the storage battery charging and discharging control system 10 can be greatly improved. The bus tie switch 630 may adopt a direct current type contactor, the rated current is DC100A, the coil voltage is DC24V, the main contact 632a is normally open, and the auxiliary contact 632b is normally open. The controllable buscouple switch 632 may also be other types of electronic switches, such as a mos transistor, and the like, and the implementation is not limited in any way, and may be specifically selected or set according to the actual situation.
Referring to fig. 2-4 together, in one embodiment, the battery charging/discharging control system 10 further includes: a DC-DC converter 700, a display apparatus 800, and a remote control apparatus 900.
The first bus 610 and the second bus 620 are both direct current buses, an input end of the DC-DC converter 700 is electrically connected to the first bus 610, an output end of the DC-DC converter 700 is electrically connected to the auxiliary contact 632b and the controller 500, respectively, the DC-DC converter 700 connects the auxiliary contact 632b of the controllable buscouple switch 632, that is, a coil lead of the controllable buscouple switch 632, in series to an output end of the DC-DC converter 700, and finally accesses a switching value control output interface of the controller 500 through the DC-DC converter 700, so as to realize driving control of the controller 500 on the auxiliary contact 632b of the controllable buscouple switch 632. Meanwhile, the auxiliary contact 632b of the controllable buscouple switch 632 is connected to the switching value input interface of the controller 500, so as to detect whether the main contact 632a of the controllable buscouple switch 632 is effectively closed or opened. In this embodiment, the input of the DC-DC converter 700 is DC110V, the output is DC24V, the input end of the DC-DC converter 700 is connected to the DC bus 600, the coil lead of the controllable buscouple switch 632 is connected in series to the output end of the DC-DC converter 700, and finally connected to the switching value control output interface of the controller 500, so as to realize the driving control of the coil of the controllable buscouple switch 632 of the controller 500. In this embodiment, the type and the like of the DC-DC converter 700 are not limited at all, and may be specifically limited according to the actual situation.
The display device 800 is in signal connection with the controller 500, for example, signal connection may be performed through a local area network such as WIFI, and the display device 800 is configured to display the operating state of the storage battery 200, so that a worker can check the operating state in real time. The display device 800 may be any of a liquid crystal display, an electronic display, or electronic paper, and the like, and the implementation is not limited at all and may be specifically selected according to actual situations.
The remote control device 900 is in signal connection with the controller 500, and the remote control device 900 may be disposed at a position away from the controller 500, so as to facilitate a worker to remotely control the battery charging and discharging control system 10. The remote controlling apparatus 900 may include: data server, management terminal, user terminal and mobile terminal, management terminal user terminal with mobile terminal all with data server signal connection for example communicates through LAN, WIFI etc. simultaneously mobile terminal is provided with the GPRS module for the location to make things convenient for the staff to confirm in real time mobile terminal's position. The data server and the controller 500 realize data interaction through a GPRS ethernet. In this embodiment, the remote control device 900 can greatly improve the control flexibility of the charging and discharging control of the storage battery 200, and avoid the restrictions of geographical locations and the like.
Referring to fig. 5, an embodiment of the present application provides a method for controlling charging and discharging of a storage battery, including steps S100-S400:
s100, acquiring a first operation parameter of the storage battery.
The first operation parameters include parameters such as voltage, current, internal resistance and temperature of the storage battery 200, wherein the voltage can be acquired through a voltmeter and a voltage transformer, the current can be acquired through an ammeter and a current transformer, the internal resistance can be directly measured through a resistance meter, the voltage and the current can be calculated and determined, and the temperature can be acquired through a temperature meter. The first operating parameter may further include other operating parameters, and this embodiment is not limited at all and may be specifically selected according to an actual situation.
S200, determining a first health state of the storage battery according to the first operation parameter.
The first state of health is used to indicate whether the current operating state of the battery 200 is normal, and may include, for example, a state of health and a state of non-health, and when the remaining capacity of the battery 200 is less than 70% or the internal resistance of the battery 200 exceeds 50% of a nominal value, it is determined that the battery 200 is in the non-health state, otherwise, the battery 200 is in the health state.
And S300, if the first health state meets a preset condition, controlling the storage battery to discharge.
The preset conditions are specifically set according to actual conditions, for example, when the first health state is a health state, the controller 500 controls the storage battery 200 to discharge for a load, so as to ensure normal and stable operation of the storage battery charging and discharging control system 10.
And S400, if the first health state does not meet the preset condition, controlling the storage battery to stop discharging.
When the state of the battery 200 is unstable, the output voltage is unstable, and when the voltage flows into a subsequent load, the operation stability is inevitably deteriorated. The preset condition is that the first health state is healthy, and when the first health state is unhealthy, the controller 500 controls the storage battery 200 to stop discharging, so as to ensure normal and stable operation of the storage battery charging and discharging control system 10.
In one embodiment, step S300 includes steps S310-S360:
and S310, if the first health state meets a preset condition, controlling the storage battery to discharge the short-time direct current load.
The controller 500 controls the working mode of the charger 100 to a discharging state, and the charger 100 is electrically connected to the storage battery 200 to charge the storage battery 200 for a short time, for example, fifteen minutes to pre-discharge, so as to determine whether the storage battery 200 can work normally. In the process of charging the storage battery 200 by the charger 100, parameters such as voltage and discharge current of the storage battery 200 are changed, and the storage battery 200 can be preliminarily diagnosed by performing short-time discharge to determine whether the health state of the storage battery 200 is suitable for continuous discharge.
And S320, acquiring a second operation parameter of the storage battery.
The second operation parameter is the same as the first operation parameter in type, but the acquisition time is different, the first operation parameter is acquired before the short-time dc load discharge of the storage battery 200, that is, the pre-discharge, and the second operation parameter in this embodiment is the operation parameter acquired during the pre-discharge of the storage battery 200.
And S330, determining a second health state of the storage battery according to the second operation parameter.
The second state of health is identical in nature to the first state of health and is the same in the determination process, but the second state of health is the state of health after re-evaluation of the operating parameters of the battery 200 after short-time dc load discharge, i.e., pre-discharge.
And S340, if the second health state meets a preset condition, controlling the storage battery to perform deep alternating current inversion discharge.
The storage battery 200 has no hidden trouble of initial failure, and meets the condition of further implementing alternating current inversion discharge, and the controller 500 controls the working modes of the charger 100 and the inverter 300 to be in a discharge state. The input end of the storage battery 200 is electrically connected to the charger 100, the output end of the storage battery 200 is electrically connected to the inverter 300, and the storage battery 200 is subjected to deep alternating-current inversion discharge through the inverter 300, where the inversion discharge depth may be specifically set according to an actual situation, for example, may be 90%. In the discharging process, the monitoring terminal 400 monitors the voltage and the current of the battery 200, the output state of the inverter 300, and the like in real time to determine the state parameters of the battery 200.
And S350, if the second health state does not meet the preset condition, controlling the storage battery to stop discharging.
In the discharging process, if the voltage of the storage battery 200 suddenly drops to the discharging cut-off voltage, the controller 500 immediately adjusts the charger 100 to the charging state, subsequently does not execute the remote discharging operation program, alarms to display the fault of the storage battery 200, and waits for manual inspection and repair.
And S360, if the deep alternating current inversion discharge capacity of the storage battery exceeds a preset threshold value, controlling a charger to charge the storage battery.
If the deep ac inversion discharge capacity of the storage battery 200 exceeds a preset threshold value, or the remaining capacity of the storage battery 200 is less than a certain value, the controller 500 adjusts the output voltage of the charger 100 to a charging state, a complete charging procedure is completed, in the charging process, the monitoring terminal 400 monitors the state information of the storage battery 200 in real time, if voltage, temperature and the like exist, once the state information of the storage battery 200 is found to be abnormal, the controller 500 controls the charger 100 to be in a zero current output state, immediately gives an alarm, and waits for manual inspection and repair.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery charge-discharge control system, comprising:
the input end of the charger is used for connecting a bus;
the input end of the storage battery is electrically connected with the output end of the charger;
the input end of the inverter is electrically connected with the output end of the storage battery, and the output end of the inverter is used for connecting a discharging load;
the monitoring terminal is electrically connected with the output end of the storage battery;
the input end of the controller is in signal connection with the monitoring terminal, the output end of the controller is in signal connection with the control end of the inverter, the controller is used for determining whether the storage battery has a fault according to the output signal of the monitoring terminal, controlling the inverter to discharge to the discharging load under the condition that the storage battery has no fault, and controlling the inverter to stop working under the condition that the storage battery has a fault.
2. The battery charge and discharge control system according to claim 1, wherein the controller is in signal connection with the charger, and the controller is further configured to control the battery to stop working and control the charger to stop charging the battery when the battery fails.
3. The battery charge and discharge control system of claim 1, further comprising a bus bar, the bus bar comprising:
the first bus is electrically connected with the input end of the charger;
a second bus bar;
the first end of the bus-coupled switch is electrically connected with the first bus, the second end of the bus-coupled switch is electrically connected with the second bus, and the bus-coupled switch is in a normally open position.
4. The battery charge and discharge control system according to claim 3, wherein the bus tie switch comprises:
a first end of the manual bus coupler switch is electrically connected with the first bus, and a second end of the manual bus coupler switch is electrically connected with the second bus;
the controllable bus coupler switch is connected with the manual bus coupler switch in parallel, the control end of the controllable bus coupler switch is in signal connection with the controller, and the controller is used for controlling the on-off of the controllable bus coupler switch.
5. The battery charge and discharge control system according to claim 4, wherein the controllable bus coupler switch includes a main contact and an auxiliary contact, the main contact is linked with the auxiliary contact, the main contact is connected in parallel with the manual bus coupler switch, the auxiliary contact is in signal connection with the controller, and the controller is configured to turn on the controllable bus coupler switch when the battery fails.
6. The battery charge-discharge control system according to claim 5, characterized by further comprising:
and the input end of the DC-DC converter is electrically connected with the first bus, and the output end of the DC-DC converter is electrically connected with the auxiliary contact and the controller respectively.
7. The battery charge-discharge control system according to claim 1, characterized by further comprising:
and the remote control equipment is in signal connection with the controller.
8. A method for controlling charging and discharging of a storage battery, comprising:
acquiring a first operating parameter of the storage battery;
determining a first state of health of the battery based on the first operating parameter;
if the first health state meets a preset condition, controlling the storage battery to discharge;
and if the first health state does not meet the preset condition, controlling the storage battery to stop discharging.
9. The battery charging and discharging control method according to claim 8, wherein the controlling the battery to discharge if the first state of health satisfies a predetermined condition comprises:
if the first health state meets a preset condition, controlling the storage battery to discharge short-time direct-current load;
acquiring a second operating parameter of the storage battery;
determining a second state of health of the battery based on the second operating parameter;
if the second health state meets a preset condition, controlling the storage battery to carry out deep alternating current inversion discharge;
and if the second health state does not meet the preset condition, controlling the storage battery to stop discharging.
10. The battery charge-discharge control method according to claim 9, characterized by further comprising:
and if the deep alternating current inversion discharge capacity of the storage battery exceeds a preset threshold value, controlling a charger to charge the storage battery.
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