CN109193048B - Method and device for maintaining storage battery pack on line - Google Patents
Method and device for maintaining storage battery pack on line Download PDFInfo
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- CN109193048B CN109193048B CN201811055698.1A CN201811055698A CN109193048B CN 109193048 B CN109193048 B CN 109193048B CN 201811055698 A CN201811055698 A CN 201811055698A CN 109193048 B CN109193048 B CN 109193048B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a method and a device for maintaining a storage battery pack on line, wherein the method comprises the following steps: when an instruction for maintaining the storage battery pack is received, judging whether the direct-current power supply module is normal or not; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance; if yes, carrying out charge and discharge maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack; and after the charging and discharging maintenance is finished, the storage battery pack is restored to the initial working state. According to the invention, during the maintenance of the storage battery pack, the direct-current power supply module supplies power to the direct-current bus corresponding to the maintained storage battery pack, so that the power supply reliability of the direct-current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a device for maintaining a storage battery pack on line.
Background
Storage battery packs in power systems are used as important energy storage devices, and need to be maintained regularly to ensure stable operation of the storage battery packs. The existing modes for maintaining the storage battery pack are divided into an offline maintenance method and an online maintenance method, wherein the offline maintenance method needs to be tracked by professionals in the whole process during maintenance, and is time-consuming and labor-consuming, so the online maintenance method can be considered for maintaining the storage battery pack, and can be automatically completed by a system without the participation of professionals. However, the existing online maintenance method has the problem of unreliable direct current bus power supply, so that the online maintenance method has poor reliability and is not widely applied.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for maintaining a battery pack online, which can improve the power supply reliability of a dc bus during the maintenance of the battery pack, and thus help to improve the reliability of the method for maintaining the battery pack online.
In a first aspect, an embodiment of the present invention provides a method for maintaining a storage battery pack online, where the method is applied to a grid monitor, and the method includes: when an instruction for maintaining the storage battery pack is received, judging whether the direct-current power supply module is normal or not; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance; if yes, carrying out charge and discharge maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack; and after the charging and discharging maintenance is finished, the storage battery pack is restored to the initial working state.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the step of determining whether the dc power module is normal includes: setting the output voltage of the direct-current power supply module as a first preset voltage, wherein the first preset voltage is higher than the initial working voltage of the direct-current bus; when the preset time length is reached, restoring the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus; judging whether the direct-current power supply module still normally operates after the direct-current power supply module recovers to the initial working voltage of the direct-current bus; if so, determining that the direct current power supply module is normal.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the step of performing charge and discharge maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack includes: adjusting the output voltage of a charger corresponding to the storage battery pack so that the charger carries out charging maintenance on the storage battery pack based on the output voltage; and adjusting the input current of the active inversion unit corresponding to the storage battery pack so that the active inversion unit performs discharge maintenance on the storage battery pack based on the input current.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the step of adjusting an output voltage of a charger corresponding to the battery pack so that the charger performs charging maintenance on the battery pack based on the output voltage includes: adjusting the output voltage of a charger corresponding to the storage battery pack to a preset equalizing charge voltage, and carrying out primary equalizing charge on the storage battery pack based on the equalizing charge voltage of the charger; judging whether the first equalizing charge process is normal or not; if yes, stopping charging maintenance when the charging result of the first equalizing charge reaches a preset charging end condition; and if not, controlling the charger to stop the charging maintenance of the storage battery pack.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the step of controlling the charger to stop the charging maintenance on the battery pack includes: adjusting the output voltage of the charger to a second preset voltage, and adjusting the output voltage of the direct-current power supply module to the second preset voltage; the second preset voltage is lower than the termination voltage of the discharge maintenance and higher than the lowest working voltage of the direct current bus.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the step of adjusting an input current of an active inverter unit corresponding to the battery pack so that the active inverter unit performs discharge maintenance on the battery pack based on the input current includes: connecting the active inversion unit to the storage battery pack; adjusting the input voltage of the active inversion unit to a preset constant current so that the storage battery pack performs constant current discharge on the active inversion unit based on the constant current; judging whether the constant current discharge process is normal or not; if so, stopping discharging maintenance when the discharging result of the constant current discharging reaches a preset discharging ending condition; and if not, controlling the active inversion unit to stop discharging and maintaining the storage battery pack.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the step of controlling the active inverter unit to stop the discharge maintenance on the battery pack includes: and closing the active inversion unit and disconnecting the active inversion unit from the storage battery pack.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the step of returning the storage battery pack to the initial operating state after the charge and discharge maintenance is finished includes: adjusting the output voltage of the charger to a preset equalizing charge voltage, and carrying out secondary equalizing charge on the storage battery pack based on the equalizing charge voltage; judging whether the second equalizing charge reaches a preset charge ending condition or not; if so, adjusting the output voltage of the charger to the preset float charging voltage, and adjusting the output voltage of the direct current power supply module to the initial working voltage of the direct current bus.
In a second aspect, an embodiment of the present invention further provides an apparatus for maintaining a battery pack online, where the apparatus includes: the judging module is used for judging whether the direct-current power supply module is normal or not when an instruction for maintaining the storage battery pack is received; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance; the maintenance module is used for carrying out charging and discharging maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack when the judgment result of the judgment module is yes; and the recovery module is used for recovering the storage battery pack to an initial working state after the charging and discharging maintenance is finished.
In a third aspect, an embodiment of the present invention further provides a computer storage medium for storing computer software instructions for the apparatus in the second aspect.
The embodiment of the invention has the following beneficial effects:
according to the method and the device for maintaining the storage battery pack on line provided by the embodiment of the invention, when an instruction for maintaining the storage battery pack is received, whether the direct-current power supply module can normally work is judged, when the direct-current power supply module can normally work, the storage battery pack is subjected to charge and discharge maintenance through a charger and an active inversion unit corresponding to the storage battery pack, and the storage battery pack is restored to an initial working state after the charge and discharge maintenance is completed. According to the embodiment of the invention, during the maintenance of the storage battery pack, the direct-current power supply module supplies power to the direct-current bus corresponding to the maintained storage battery pack, so that the power supply reliability of the direct-current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for maintaining a battery pack online according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for maintaining a battery pack online according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a connection of a dc power system for maintaining a battery pack online according to an embodiment of the present invention;
fig. 4 is a block diagram of a structure of an online maintenance battery pack apparatus according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The problem that the power supply of a direct current bus is unreliable exists in the existing online maintenance storage battery pack, and if a system is abnormal during the maintenance of the storage battery pack, the direct current bus corresponding to the maintained storage battery pack cannot normally transmit power due to the fact that no power supply exists in the direct current bus, so that the online maintenance storage battery pack cannot be widely applied.
Based on this, the method for maintaining the storage battery pack on line provided by the embodiment of the invention can supply power to the direct current bus corresponding to the maintained storage battery pack by the direct current power supply module during the maintenance of the storage battery pack, thereby improving the power supply reliability during the maintenance of the storage battery pack.
For the purpose of understanding the embodiment of the present invention, firstly, a detailed description is given to a method for maintaining a storage battery pack online, which is disclosed in the embodiment of the present invention, and referring to a flowchart of a method for maintaining a storage battery pack online, which is shown in fig. 1 and is applied to a grid monitor, where the method includes the following steps:
and step S102, judging whether the direct current power supply module is normal or not when receiving an instruction of maintaining the storage battery pack.
Generally, an electric power system is generally provided with two groups of storage battery packs, which are divided into two sections of Direct Current buses, and the two sections of Direct Current buses are mutually standby through a bus tie switch and a Direct Current power module, wherein the Direct Current power module is used for supplying power to the Direct Current bus corresponding to the storage battery pack to be maintained during the maintenance of the storage battery pack, and the Direct Current power module can be a bidirectional Direct Current (dc) power module. For example, the first storage battery pack corresponds to a first direct current bus, the second storage battery pack corresponds to a second direct current bus, and when the first storage battery pack is maintained, the second storage battery pack can supply power to the first direct current bus corresponding to the first storage battery pack through the bidirectional DCDC power supply module. Because the bidirectional DCDC power supply module is arranged between the first storage battery pack and the second storage battery pack, power can be supplied to the first direct-current power supply module through the second storage battery pack even during the maintenance of the storage battery packs, and the first direct-current bus does not have power loss faults.
In addition, the command for maintaining the storage battery pack received by the monitor can be triggered in various ways, and in practical application, the command for maintaining the storage battery pack can be triggered in the following ways:
the first mode is automatic triggering. For example, a time period T is set in the monitor, and every T times, the monitor will automatically trigger an instruction to maintain the battery pack.
The method II is manually triggered, namely, a command for maintaining the storage battery pack is manually sent to a monitor by a person; or the parameters of the monitor are manually set manually, so that the monitor triggers an instruction for maintaining the storage battery pack after detecting the parameter change. Preferably, the battery pack maintenance instructions may be configured to be triggered either automatically or manually.
And step S104, if so, carrying out charging and discharging maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack.
And after the monitor judges that the direct-current power supply module can work normally, the charger, the bidirectional DCDC power supply module and the active inversion unit are controlled to realize balanced charging and constant-current discharging of the maintained storage battery pack. The method comprises the steps that the charger can charge the maintained storage battery pack in an equalizing mode through setting output voltage of the charger corresponding to the maintained storage battery pack, when the equalizing charge meets a preset charge ending condition, the charger stops the equalizing charge of the maintained storage battery pack, input current of an active inversion unit corresponding to the maintained storage battery pack is set to enable the maintained storage battery pack to discharge to the active inversion unit in a constant current mode, and when the constant current discharge meets a preset discharge ending condition, the active inversion unit stops constant current discharge of the maintained storage battery pack. For example, the power system starts to maintain the first storage battery pack, after the bidirectional DCDC power supply module is checked to work normally, the output voltage of the first charger corresponding to the first storage battery pack is set, so that the first charger charges the first storage battery pack in an equalizing manner, after the equalizing charge is finished, the input current of the first active inverter unit corresponding to the first storage battery pack is set, so that the first storage battery pack discharges to the first active inverter unit at a constant current, and the discharge is stopped after a discharge end condition is reached. In addition, during the period of equalizing charge and constant current discharge of the first storage battery pack, the second storage battery pack supplies power to the first direct current bus corresponding to the first maintenance storage battery pack through the bidirectional DCDC power supply module, so that the first direct current bus can normally work.
Preferably, an active inverter unit may be disposed between the first battery pack and the second battery pack, and a control switch may be disposed between the battery packs and the active inverter unit. When the first storage battery pack is subjected to constant-current discharge, the control switch is switched to the side of the first storage battery pack, so that the active inversion unit is connected with the first storage battery pack; when the second storage battery pack is subjected to constant-current discharge, the control switch is switched to the side of the second storage battery pack, so that the active inversion unit is connected with the second storage battery pack; and when the constant current discharge is not carried out, the control switch is switched to the neutral gear. The active inversion unit can be effectively utilized in the mode, and the cost for maintaining the storage battery pack is saved.
And step S106, after the charge and discharge maintenance is finished, the storage battery pack is restored to the initial working state.
After the storage battery pack is charged and discharged and maintained, the output voltage of the bidirectional DCDC power supply module is set to be the voltage before the storage battery pack is maintained, namely the initial working voltage of the direct current bus. Considering that the long-term working voltage of the storage battery pack is float charging voltage, the output voltage of the charger corresponding to the maintained storage battery pack is set as the float charging voltage, so that the charger outputs the float charging voltage to the maintained storage battery pack, and the storage battery pack is in a normal working state after maintenance.
According to the method for maintaining the storage battery pack on line provided by the embodiment of the invention, when an instruction for maintaining the storage battery pack is received, whether the direct-current power supply module can work normally is judged, when the direct-current power supply module can work normally, the storage battery pack is charged and discharged through a charger and an active inversion unit corresponding to the storage battery pack, and the storage battery pack is restored to an initial working state after the charging and discharging maintenance is completed. According to the embodiment of the invention, during the maintenance of the storage battery pack, the direct current power supply module supplies power to the direct current bus corresponding to the maintained storage battery pack, so that the system fails in time during the maintenance, the direct current bus corresponding to the maintained storage battery pack can also work normally, the power supply reliability of the direct current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
For ease of understanding, a specific embodiment of a method for maintaining a battery pack online according to the present embodiment is given below, referring to a flowchart of another method for maintaining a battery pack online shown in fig. 2, where the method includes the following steps:
step S202, when an instruction of maintaining the storage battery pack is received, the output voltage of the direct current power supply module is set to be a first preset voltage.
Considering that during maintenance of the battery pack, a power system or a unit for maintaining the battery pack may malfunction, which may generate a transient inrush current, and thus a short-term overload function is required for the bidirectional DCDC power module, the output voltage of the bidirectional DCDC power module is set to a first preset voltage higher than the initial operating voltage of the dc bus, so that power can be supplied from the bidirectional DCDC power module to the dc bus corresponding to the battery pack to be maintained even if the power system or other units malfunction during maintenance of the battery pack. For example, during the maintenance of the first storage battery pack, a power system fails and generates a short inrush current, and because the bidirectional DCDC power module has a short overload function, the bidirectional DCDC power module can normally operate under the inrush current, and at this time, the second storage battery pack can supply power to the first dc bus corresponding to the first storage battery pack through the bidirectional DCDC power module, so that the first dc bus can continue to operate, and the power supply reliability of the dc bus during the maintenance of the storage battery pack is improved.
And step S204, when the preset duration is reached, restoring the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus.
Considering that the rush current generated due to the fault may be maintained for a period of time, setting a time period which is longer than the time period for maintaining the rush current, and keeping the output voltage of the bidirectional DCDC power supply module at the first preset voltage for the set time period to ensure that the bidirectional DCDC power supply module can normally work in the time period when the rush current exists. For example, if the rush current is maintained for a time period of approximately T1, the preset time period is set to T2, where T2 is greater than T1, the output voltage of the bidirectional DCDC power module is set to the first preset voltage, and the time period is maintained for T2.
Step S206, determining whether the dc power module still normally operates after the dc power module is restored to the initial operating voltage of the dc bus. If yes, go to step S208; if not, the process is ended.
In one embodiment, an alarm signal may be sent by the bidirectional DCDC power module to the monitor. In the time T2, if the DCDC power module does not send an alarm signal to the monitor, which indicates that the bidirectional DCDC power module can work normally, the charge and discharge maintenance of the maintained storage battery pack is started; if the bidirectional DCDC power supply module sends alarm information to the monitor within the time of T2, the bidirectional DCDC power supply module cannot normally work under the impact current, and therefore the monitor cannot carry out charging and discharging maintenance on the maintained storage battery pack. Preferably, after the bidirectional DCDC power module sends the alarm signal, the output current of the bidirectional DCDC power module is immediately restored to the initial voltage, that is, the voltage of the output port corresponding to the maintained storage battery pack is restored to the initial voltage of the direct current bus, so as to prevent the impact current from damaging the bidirectional DCDC power module.
And step S208, adjusting the output voltage of the charger corresponding to the storage battery to a preset uniform charging voltage.
The device comprises a bidirectional DCDC power module, a monitor, a storage battery pack, a bidirectional DCDC power module and a charger, wherein the bidirectional DCDC power module is used for supplying power to the bidirectional DCDC power module, the charger is used for charging the bidirectional. For example, when the monitor is ready to charge the first battery pack in an equalizing manner, the output voltage of the charger corresponding to the first battery pack is adjusted to the equalizing voltage Ue, so that the charger charges the first battery pack in an equalizing manner based on the equalizing voltage Ue.
And step S210, carrying out primary equalizing charge on the storage battery pack based on the equalizing charge voltage of the charger.
In step S212, it is determined whether the first equalizing charge process is normal. If yes, go to step S214; if not, step S216 is performed.
It can be understood that, in the equalizing charge process, an error or a fault may occur in a power grid system or a charger, and therefore, in the equalizing charge process of the maintained storage battery pack, whether the system is abnormal or not needs to be monitored in real time, so that the monitor can timely process the abnormality, and a larger loss is avoided.
In step S214, it is determined whether the charging result of the first equalizing charge reaches a preset charging end condition. If yes, go to step S216; if not, step S210 is performed.
Under normal conditions, the monitor can preset a charging end condition, and when the charger corresponding to the maintained storage battery pack performs equalizing charging on the maintained storage battery pack to reach the charging end condition, the charger is controlled to stop performing equalizing charging on the maintained storage battery pack; and if the charging end condition is not met, the charger continues to perform equalizing charging on the maintained storage battery pack.
Step S216 is to adjust the output voltage of the charger to a second preset voltage, and adjust the output voltage of the dc power supply module to the second preset voltage.
In order to enable the discharging end voltage to reach the preset end voltage during the discharging maintenance, the second preset voltage should be lower than the preset end voltage for the discharging maintenance, and if the second preset voltage is higher than the preset end voltage for the discharging maintenance, the charger may charge the battery pack to be maintained, so that the constant-current discharging may be stopped when the discharging voltage does not reach the preset end voltage. In addition, considering that the voltage on the direct current bus corresponding to the maintained storage battery pack should meet the load requirement, the second preset voltage should be higher than the lowest working voltage of the direct current bus, and the non-maintained storage battery pack provides the second preset voltage to the direct current bus corresponding to the maintained storage battery pack through the bidirectional DCDC power supply module, so that the direct current bus corresponding to the maintained storage battery pack can normally supply power.
Step S218, the active inverter unit is connected to the battery pack.
The active inversion unit can be set for each group of storage battery pack, and the active inversion unit corresponding to the maintained storage battery pack is started by the monitor. Preferably, a control switch can be arranged between the storage battery pack and the active inversion unit, and the monitor controls the switching of the control switch, so that the active inversion unit is connected to the storage battery pack to be maintained.
Step S220, the input voltage of the active inverter unit is adjusted to a preset constant current.
Wherein the preset constant current is set according to the property of the battery pack. After the balanced discharge is finished, the monitor switches the control switch to the side of the maintained storage battery pack, connects the active inversion unit and the maintained storage battery pack, simultaneously adjusts the input current of the active inversion unit, and sets the input current of the active inversion unit to be preset constant current voltage. For example, when the monitor completes the equalizing charge of the first battery pack, the active inverter unit and the first battery pack are connected, and the input current of the active inverter unit is adjusted to be the constant current Iset, so that the first battery pack performs constant current discharge to the active inverter unit based on the constant current Iset.
And step S222, controlling the storage battery pack to perform constant current discharge on the active inversion unit based on the constant current.
Step S224, determining whether the constant current discharging process is normal. If yes, go to step S226; if not, step S228 is performed.
It can be understood that, during the constant current discharging process, errors or faults may occur in the power grid system or the charger, and therefore, during the constant current discharging process of the maintained storage battery pack, whether the system is abnormal or not needs to be monitored in real time, so that the monitor can timely process the abnormalities, and larger loss is avoided.
In step S226, it is determined whether the discharge result of the constant current discharge reaches a preset discharge end condition. If yes, go to step S228, and if no, go to step S222.
Under the normal condition, the monitor can preset a discharge ending condition, and when the equalizing charge of the active inversion unit to the maintained storage battery pack reaches the discharge ending condition, the active inversion unit is controlled to stop constant-current discharge of the maintained storage battery pack; and if the discharging end condition is not met, the active inversion unit continues to perform constant-current charging on the maintained storage battery pack. The discharge end condition is generally that the output voltage of the maintained storage battery pack is lower than a preset discharge end voltage, that is, when the output voltage of the maintained storage battery pack is less than or equal to the preset discharge end voltage, the constant current discharge of the maintained storage battery pack to the active inverter unit is stopped.
And step S228, closing the active inversion unit and disconnecting the active inversion unit from the storage battery pack.
For example, when the output voltage of the maintained storage battery pack is less than or equal to the preset discharge termination voltage, the active inverter unit is turned off, and then the control switch is switched to the neutral gear. Based on the consideration of operation safety, the active inversion unit should be closed first, so that the maintained storage battery pack stops outputting current to the active inversion unit, and then the connection between the active inversion unit and the maintained storage battery pack is disconnected, thereby reducing the safety accidents caused by improper operation as much as possible.
Preferably, when the maintained storage battery pack stops constant-current discharge to the active inverter unit, the capacity of the maintained storage battery pack can be calculated, and whether the capacity of the storage battery pack meets the standard of normal operation or not is judged, so that the scrapped storage battery pack can be replaced in time. The capacity of the storage battery pack is equal to the product of constant current discharge current and constant current discharge time.
Step S230, the output voltage of the charger is adjusted to a preset uniform charging voltage.
For example, when the monitor completes the constant current to the first battery pack, the output voltage of the charger corresponding to the first battery pack is adjusted to the uniform charging voltage Ue, so that the charger performs the second time of the uniform charging to the first battery pack based on the uniform charging voltage Ue. It can be understood that, since the maintained battery pack has already completed the constant current discharge, the maintained battery pack is in an undercharge state at this time, and therefore needs to be equalized to make the maintained battery pack reach the same charge level as other battery packs not undergoing maintenance.
And step S232, carrying out secondary equalizing charge on the storage battery pack based on the equalizing charge voltage.
In step S234, it is determined whether the second equalizing charge reaches a preset charge end condition. If yes, go to step S236; if not, step S232 is performed.
Step S236, adjusting the output voltage of the charger to a preset float charging voltage, and adjusting the output voltage of the dc power supply module to the initial working voltage of the dc bus.
Because the storage battery pack works under the floating charge voltage for a long time, the output voltage of the charger corresponding to the maintained storage battery pack is set as the floating charge voltage, so that the maintained storage battery pack is recovered to the working state before maintenance. In addition, because the maintenance of the secondary battery pack has been completed, the output voltage of the bidirectional DCDC power supply module can be restored to the voltage before the maintenance.
According to the method for maintaining the storage battery pack on line provided by the embodiment of the invention, when an instruction for maintaining the storage battery pack is received, whether the bidirectional DCDC power supply module can normally work is judged, when the bidirectional DCDC power supply module can normally work, the maintained storage battery pack is subjected to equalizing charge through a charger corresponding to the maintained storage battery pack, constant current discharge is carried out on the maintained storage battery pack through the active inversion unit, and the storage battery pack is restored to the initial working state after the charge-discharge maintenance is completed. According to the embodiment of the invention, even if the system fails during maintenance, the direct current bus corresponding to the maintained storage battery pack can be supplied with power through the bidirectional DCDC power module, so that the power supply reliability of the direct current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
Referring to fig. 3, a schematic diagram of a dc power system connection for online maintenance of the first battery pack is shown.
The power system is provided with two groups of storage battery packs, namely a first storage battery pack and a second storage battery pack, a first direct current bus, a first charger, a first direct current port of a bidirectional DCDC power module and an A end of a control switch correspond to the first storage battery pack, a second direct current bus, a second charger, a second direct current port of the bidirectional DCDC power module and a B end of the control switch correspond to the second storage battery pack, and a C end of the control switch is a neutral gear. A bus coupler switch is arranged between the first direct current bus and the second direct current bus; an active inversion unit is arranged between the first storage battery pack and the second storage battery pack and can be connected with the storage battery pack through a control switch; the monitor is connected in parallel to the direct current bus.
Assuming that the power supply system is a 220 system, the configuration of the first storage battery pack and the second storage battery pack is completely consistent, the capacity is 200Ah, the uniform charging voltage Ue is 242V, the floating charging voltage Uf is 230V, the discharging termination voltage Uset is 194.4V, and the constant current discharging current Iset is 20A. In addition, the lowest working voltage Umin of the first direct current bus and the second direct current bus is 192.5V, and the self-checking time of the bidirectional DCDC power supply module is 5 minutes.
Under the condition that the system is normal, the voltage of the first direct current bus and the voltage of the second direct current bus are the same as the floating charge voltage of the storage battery pack and are both 230V, the voltage of the first direct current port and the voltage of the second direct current port of the bidirectional DCDC power supply module are both 200V, the control switch is at the C end, the active inversion unit is in a shutdown state, and the bus-bar switch is in a disconnection state.
At a certain moment, the monitor receives an instruction of online maintenance of the first storage battery pack, sets the output voltage of the first dc port of the bidirectional DCDC power module, sets the output voltage to be higher than the initial operating voltage of the first dc bus, that is, to be higher than 230V, assumes that the output voltage of the first dc port of the bidirectional DCDC power module is set to 232V, and maintains the output voltage of 232V for 5 minutes. If the bidirectional DCDC power supply module sends out a fault warning to the monitor within 5 minutes, the bidirectional DCDC power supply module immediately adjusts the output voltage of the first direct current port to be the initial working voltage 200V of the first direct current bus, and the monitor cannot perform charging and discharging maintenance on the first storage battery pack; if the bidirectional DCDC power supply module does not send any fault warning within 5 minutes, after the 5 minutes, the output voltage of the first direct current port of the bidirectional DCDC power supply module is adjusted to be 200V of the initial working voltage of the first direct current bus, namely the bidirectional DCDC power supply module passes self-checking. And the monitor starts to carry out charging and discharging maintenance on the first storage battery pack.
The monitor adjusts the output voltage of the first charger to the uniform charging voltage 242V, and performs first-time uniform charging on the first storage battery pack.
After the first equalizing charge of the first storage battery pack is finished, the monitor controls the output voltages of the first charger and the first direct current port of the bidirectional DCDC power supply module to be adjusted to a preset voltage, the preset voltage is larger than the lowest working voltage of 192.5V of the first direct current bus and smaller than the discharge termination voltage of 194.4V of the first storage battery pack, and if the preset voltage is 193.5V, the output voltage of the first charger and the output voltage of the first direct current port of the bidirectional DCDC power supply module are adjusted to be 193.5V.
After the output voltages of the first charger and the first direct current port of the bidirectional DCDC power supply module are set, the control switch is switched to the end A, the active inversion unit is connected with the first storage battery pack, meanwhile, the input current of the active inversion unit is set to be 20A of the discharge current of the first storage battery pack, the active inversion unit is started, and the first storage battery pack is discharged at a constant current of 20A through the active inversion unit. When the monitor monitors that the voltage of the output end of the first storage battery pack is less than or equal to 194.4V of the discharge termination voltage, the monitor closes the active inversion unit, operates the control switch to the end C, enables the active inversion unit to be disconnected with the first storage battery pack, and meanwhile, the monitor calculates the capacity of the first storage battery pack.
After the operation is finished, the monitor sets the output voltage of the first charger to be the uniform charging voltage 242V, performs the second uniform charging on the first storage battery pack, and after the second uniform charging is finished, the monitor sets the output voltage of the first charger to be the floating charging voltage 230V and sets the output voltage of the first direct current port of the bidirectional DCDC power supply module to be 200V.
Further, if the monitor detects that the system is abnormal before the monitor starts the active inversion unit, the monitor will not start the active inversion unit any more.
In addition, if the monitor detects that there is an abnormality in the system while the first battery pack is performing constant current discharge, the monitor will immediately terminate the constant current discharge of the first battery pack, and the calculated capacity of the first battery pack at this time is invalid.
Further, the first storage battery pack performs constant current discharge, when the output voltage of the first storage battery pack is equal to 194.4V of the discharge termination voltage, the monitor detects that the system fails, and because the constant current discharge of the first storage battery pack is completed, the first storage battery pack cannot meet the load requirement of the first direct current bus, and at the moment, the second direct current bus supplies power to the first direct current bus through the bidirectional DCDC power supply module so as to meet the load requirement of the first direct current bus.
According to the method and the device for maintaining the storage battery pack on line provided by the embodiment of the invention, when an instruction for maintaining the storage battery pack is received, whether the direct-current power supply module can normally work is judged, when the direct-current power supply module can normally work, the storage battery pack is subjected to charge and discharge maintenance through a charger and an active inversion unit corresponding to the storage battery pack, and the storage battery pack is restored to an initial working state after the charge and discharge maintenance is completed. According to the embodiment of the invention, during the maintenance of the storage battery pack, when the storage battery pack cannot meet the load requirement of the direct current bus, the direct current power supply module supplies power to the direct current bus corresponding to the maintained storage battery pack, so that the power supply reliability of the direct current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
The embodiment of the invention provides a device for maintaining a storage battery pack online, and refers to a structural block diagram of the device for maintaining the storage battery pack online shown in fig. 4, wherein the device comprises the following modules:
a judging module 402, configured to, when an instruction to maintain the storage battery pack is received, judge whether the dc power supply module is normal; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance;
the maintenance module 404 is configured to perform charge and discharge maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack when the determination result of the determination module is yes;
and the recovery module 406 is configured to recover the storage battery pack to an initial working state after the charge and discharge maintenance is finished.
According to the device for maintaining the storage battery pack on line provided by the embodiment of the invention, when the instruction for maintaining the storage battery pack is received, the judging module starts to judge whether the bidirectional DCDC power supply module can normally work, when the bidirectional DCDC power supply module can normally work, the storage battery pack is subjected to charge and discharge maintenance through the maintaining module, and after the charge and discharge maintenance is completed, the storage battery pack is restored to the initial working state through the restoring module. According to the embodiment of the invention, during the maintenance of the storage battery pack, the bidirectional DCDC power supply module is used for supplying power to the direct current bus corresponding to the maintained storage battery pack, so that the direct current bus power loss phenomenon caused by system failure during the maintenance is effectively prevented, the power supply reliability of the direct current bus during the maintenance of the storage battery pack is improved, and the reliability of the method for maintaining the storage battery pack on line is further improved.
The implementation principle and the generated technical effect of the device for maintaining the storage battery pack online provided by the embodiment of the present disclosure are the same as those of the foregoing method embodiment, and for brief description, reference may be made to corresponding contents in the foregoing method embodiment for the part where the embodiment of the device is not mentioned.
The computer program product of the method and the apparatus for maintaining a storage battery pack online provided by the embodiment of the present invention includes a computer readable storage medium storing a nonvolatile program code executable by a processor, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, and will not be described herein again.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing embodiments, and will not be described herein again.
The computer program product of the readable storage medium provided in the embodiment of the present invention includes a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, which is not described herein again.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method for maintaining a battery pack online, wherein the method is applied to a grid monitor, and the method comprises:
when an instruction for maintaining the storage battery pack is received, judging whether the direct-current power supply module is normal or not; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance;
if yes, carrying out charging and discharging maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack;
after the charge and discharge maintenance is finished, the storage battery pack is restored to an initial working state;
the step of judging whether the direct current power supply module is normal comprises the following steps:
setting the output voltage of the direct current power supply module to be a first preset voltage; the first preset voltage is higher than the initial working voltage of the direct current bus;
when the preset time length is reached, restoring the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus;
judging whether the direct-current power supply module still normally operates after the direct-current power supply module recovers to the initial working voltage of the direct-current bus;
if so, determining that the direct current power supply module is normal;
the step of carrying out charging and discharging maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack comprises the following steps:
adjusting the output voltage of a charger corresponding to the storage battery pack so that the charger carries out charging maintenance on the storage battery pack based on the output voltage;
adjusting input current of an active inversion unit corresponding to the storage battery pack so that the active inversion unit performs discharge maintenance on the storage battery pack based on the input current;
the step of restoring the storage battery pack to an initial working state after the charge and discharge maintenance is finished comprises the following steps:
adjusting the output voltage of the charger to a preset equalizing charge voltage, and carrying out secondary equalizing charge on the storage battery pack based on the equalizing charge voltage;
judging whether the second equalizing charge reaches a preset charge ending condition or not;
if so, adjusting the output voltage of the charger to a preset floating charging voltage, and adjusting the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus.
2. The method according to claim 1, wherein the step of adjusting the output voltage of a charger corresponding to the battery pack so that the charger performs charging maintenance on the battery pack based on the output voltage comprises:
adjusting the output voltage of a charger corresponding to the storage battery pack to a preset equalizing charge voltage, and carrying out primary equalizing charge on the storage battery pack based on the equalizing charge voltage of the charger;
judging whether the first equalizing charge process is normal or not;
if yes, stopping charging maintenance when the charging result of the first equalizing charge reaches a preset charging end condition;
and if not, controlling the charger to stop the charging maintenance of the storage battery pack.
3. The method according to claim 2, wherein the step of controlling the charger to stop the charging maintenance of the battery pack comprises:
adjusting the output voltage of the charger to a second preset voltage, and adjusting the output voltage of the direct-current power supply module to the second preset voltage; wherein the second preset voltage is lower than the termination voltage of the discharging maintenance and higher than the lowest working voltage of the direct current bus.
4. The method of claim 1, wherein the step of adjusting the input current of the active inverter unit corresponding to the battery pack to cause the active inverter unit to perform discharge maintenance on the battery pack based on the input current comprises:
connecting the active inversion unit to the battery pack;
adjusting the input voltage of the active inversion unit to a preset constant current so that the storage battery pack performs constant current discharge on the active inversion unit based on the constant current;
judging whether the constant current discharge process is normal or not;
if so, stopping discharging maintenance when the discharging result of the constant current discharging reaches a preset discharging ending condition;
and if not, controlling the active inversion unit to stop discharging and maintaining the storage battery pack.
5. The method of claim 4, wherein the step of controlling the active inverter unit to stop discharging maintenance of the battery pack comprises:
and closing the active inversion unit and disconnecting the active inversion unit from the storage battery pack.
6. An apparatus for maintaining a battery pack online, the apparatus comprising:
the judging module is used for judging whether the direct-current power supply module is normal or not when an instruction for maintaining the storage battery pack is received; the direct-current power supply module is used for supplying power to a direct-current bus corresponding to the storage battery pack during storage battery pack maintenance;
the maintenance module is used for carrying out charging and discharging maintenance on the storage battery pack through a charger and an active inversion unit corresponding to the storage battery pack when the judgment result of the judgment module is yes;
the recovery module is used for recovering the storage battery pack to an initial working state after the charging and discharging maintenance is finished;
the judging module is further configured to:
setting the output voltage of the direct current power supply module to be a first preset voltage; the first preset voltage is higher than the initial working voltage of the direct current bus;
when the preset time length is reached, restoring the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus;
judging whether the direct-current power supply module still normally operates after the direct-current power supply module recovers to the initial working voltage of the direct-current bus;
if so, determining that the direct current power supply module is normal;
the maintenance module is further to:
adjusting the output voltage of a charger corresponding to the storage battery pack so that the charger carries out charging maintenance on the storage battery pack based on the output voltage;
adjusting input current of an active inversion unit corresponding to the storage battery pack so that the active inversion unit performs discharge maintenance on the storage battery pack based on the input current;
the recovery module is further to:
adjusting the output voltage of the charger to a preset equalizing charge voltage, and carrying out secondary equalizing charge on the storage battery pack based on the equalizing charge voltage;
judging whether the second equalizing charge reaches a preset charge ending condition or not;
if so, adjusting the output voltage of the charger to a preset floating charging voltage, and adjusting the output voltage of the direct-current power supply module to the initial working voltage of the direct-current bus.
7. A computer storage medium storing computer software instructions for use by the apparatus of claim 6.
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| CN107219470B (en) * | 2017-07-24 | 2020-05-01 | 深圳市泰昂能源科技股份有限公司 | On-line checking discharge device and method for storage battery pack |
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