CN114628804A - Control device and method for online maintenance of storage battery pack and power system - Google Patents
Control device and method for online maintenance of storage battery pack and power system Download PDFInfo
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- CN114628804A CN114628804A CN202210229155.7A CN202210229155A CN114628804A CN 114628804 A CN114628804 A CN 114628804A CN 202210229155 A CN202210229155 A CN 202210229155A CN 114628804 A CN114628804 A CN 114628804A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/46—Accumulators structurally combined with charging apparatus
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a control device, a method and a power system for online maintenance of a storage battery pack, wherein the control device for online maintenance of the storage battery pack comprises the following steps: the direct current bus is connected with a charging device and a system load; the storage battery maintenance switches are connected with one input/output end of each storage battery maintenance switch in a grouping mode; the high-voltage port of the bidirectional DC/DC conversion module is connected with the direct-current bus, and the low-voltage port of the bidirectional DC/DC conversion module is interconnected with the other input/output end of the plurality of storage battery maintenance switches; and the system monitor is respectively connected with the storage battery maintenance switches and the bidirectional DC/DC conversion module and is used for controlling the storage battery maintenance switches and the bidirectional DC/DC conversion module to work so as to perform online maintenance on the storage battery pack. The invention provides a safe, reliable and automatic online storage battery pack online maintenance device, which solves the problem of how to realize automatic online maintenance of the storage battery pack.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a control device and method for online maintenance of a storage battery pack and an electric power system.
Background
The direct-current operation power supply system in the power system mainly has the advantages that power is supplied to system equipment through a direct-current bus, and when an alternating-current power grid is normal, electric energy is supplied to the direct-current bus after the alternating-current power grid is converted; when the AC power grid has power failure, the storage battery pack in the DC operation power supply system provides electric energy for the DC bus. And system equipment on the direct current bus is important equipment and is used for ensuring the normal operation of the power system. Therefore, the storage battery pack as a backup power supply plays an important role in effectively preventing the direct-current bus from losing power. Based on the characteristics of the storage battery pack, the storage battery pack must be periodically charged and discharged for maintenance, so that the long-term reliable operation of the storage battery pack can be ensured.
The conventional storage battery pack maintenance method in the market at present is to regularly use a storage battery discharge instrument for maintenance, and the maintenance method generally separates a maintained storage battery pack from a direct current bus within maintenance time and then puts a standby storage battery pack into a system. In a direct-current power supply system of a power system, for safety, operation of separating a maintained storage battery pack and putting into a standby storage battery pack needs field manual operation of professional maintenance personnel, the professional maintenance personnel need to track the storage battery pack in the whole process, the time for maintaining each storage battery pack is about 10-20 hours, the number of the storage battery packs used in the power system is large, a large number of professional operation personnel are needed, and the labor cost is high.
Disclosure of Invention
The invention mainly aims to provide a control device and a control method for online maintenance of a storage battery pack and an electric power system, and aims to realize safe, reliable and automatic online maintenance of the storage battery pack.
In order to achieve the above object, the present invention provides a control device for online maintenance of a storage battery pack, including:
the direct current bus is connected with a charging device and a system load;
the storage battery maintenance switches are connected with one input/output end of each storage battery maintenance switch in a grouping mode;
a bidirectional DC/DC conversion module including a high voltage port and a low voltage port, the high voltage port of the bidirectional DC/DC conversion module being connected to the DC bus, the low voltage port of the bidirectional DC/DC conversion module being interconnected to another input/output terminal of the plurality of battery maintenance switches;
and the system monitor is respectively connected with the storage battery maintenance switches and the bidirectional DC/DC conversion module and is used for controlling the storage battery maintenance switches and the bidirectional DC/DC conversion module to work so as to perform online maintenance on the storage battery pack.
Optionally, the control device for online maintenance of the storage battery pack further includes:
the battery patrol instrument is used for acquiring the terminal voltage of each storage battery group and the parameters of the single storage battery in each storage battery group and outputting the terminal voltage and the parameters of the single storage battery in each storage battery group to the system monitor, so that the system monitor controls the storage battery charging switch, the storage battery maintenance switches and the bidirectional DC/DC conversion module to work according to the terminal voltage of each storage battery group and the parameters of the single storage battery in each storage battery group detected by the battery patrol instrument, and the storage battery is maintained online.
Optionally, the system monitor is specifically configured to, when it is determined that an abnormal storage battery group exists in the storage battery pack according to a single battery parameter of each storage battery group detected by the battery polling instrument, close a storage battery maintenance switch corresponding to the abnormal storage battery group, and configure a low-voltage port of the bidirectional DC/DC conversion module as an input port and a high-voltage port of the bidirectional DC/DC conversion module as an output port, so as to control the abnormal storage battery group to perform constant-current discharge on a system load until the discharge is completed; and (c) a second step of,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to perform equalizing charge and floating charge on the abnormal storage batteries in groups in sequence.
Optionally, the control device for online maintenance of the storage battery pack further includes:
the input end of the storage battery charging control circuit is connected with the direct current bus, the output end of the storage battery charging control circuit is connected with the storage battery pack, and when the storage battery charging switch is closed, a power supply accessed from the direct current bus is output to the storage battery pack so as to charge the storage battery pack.
Optionally, when the storage battery pack meets an online maintenance condition and the storage battery charging switches are controlled to be closed, the system monitor controls the plurality of storage battery maintenance switches to be closed/opened one by one according to a preset sequence;
configuring a low-voltage port of the bidirectional DC/DC conversion module as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module as an output port, closing the corresponding storage battery maintenance switch, and controlling a storage battery packet corresponding to the storage battery maintenance switch to perform constant-current discharge on a system load until the discharge is finished; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to sequentially perform equalizing charge and floating charge on the storage batteries corresponding to the storage battery maintenance switch in groups.
Optionally, the number of the single batteries included in each battery group is the same or different, and the number of the single batteries included in the battery group satisfies the following conditions: and when the group discharge of the maintained storage batteries is finished, the terminal voltage of the storage battery pack is not lower than the minimum required voltage of the direct current bus.
Optionally, the control device for online maintenance of the storage battery pack further includes:
the cathode of the diode is connected with the direct current bus, and the anode of the diode is connected with the storage battery charging switch; the parallel switch is arranged in parallel with the diode;
the parallel switch keeps a closed state in the system operation process, and the direct current bus charges the storage battery pack through the parallel switch and the storage battery charging switch;
the system monitor is also used for controlling a low-voltage port of the DC/DC conversion module to work in a hot standby output state and controlling the storage battery pack to provide electric energy for the storage batteries in groups through the diodes when detecting the power loss fault of the alternating current power grid.
Optionally, the control device for online maintenance of the storage battery pack further includes:
the discharging device is electrically connected with the direct current bus through the auxiliary discharging switch;
the system monitor is further used for controlling the auxiliary discharge switch to be turned on/off, and controlling the discharge device to regulate the current of the direct current bus when the auxiliary discharge switch is turned off.
The invention also provides a control method for the online maintenance of the storage battery pack, which is applied to the control device for the online maintenance of the storage battery pack, wherein the control device for the online maintenance of the storage battery pack comprises a plurality of storage battery maintenance switches, a bidirectional DC/DC conversion module, a system monitor and a battery inspection instrument; the control method for the online maintenance of the storage battery pack comprises the following steps:
when the storage battery pack meets the online maintenance condition, controlling the on/off of the corresponding storage battery maintenance switches in the plurality of storage battery maintenance switches according to a preset control strategy;
configuring a low-voltage port of the bidirectional DC/DC conversion module as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module as an output port, and controlling a storage battery packet corresponding to the storage battery maintenance switch to perform constant-current discharge on a system load until the discharge is finished when the corresponding storage battery maintenance switch is closed; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to sequentially perform equalizing charge and floating charge on the storage batteries corresponding to the storage battery maintenance switch in groups.
The invention also provides an electric power system which comprises the storage battery pack and the control device for online maintenance of the storage battery pack.
According to the invention, a plurality of storage battery maintenance switches are arranged, so that one input/output end of each storage battery maintenance switch is connected with a corresponding group of storage batteries in groups, a high-voltage port of a bidirectional DC/DC conversion module is connected with the direct-current bus, a low-voltage port of the bidirectional DC/DC conversion module is connected with the other input/output end of the storage battery maintenance switches, and a system monitor is used for controlling the storage battery maintenance switches and the bidirectional DC/DC conversion module to work so as to maintain the storage battery pack on line. The invention provides a safe, reliable and automatic online storage battery pack online maintenance device, the whole online maintenance process of the storage battery pack can be automatically completed by a system monitor without the participation of professional operators, and the problem of how to realize the automatic online maintenance of the storage battery pack is solved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a control device for online maintenance of a storage battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic view of a working flow of an embodiment of a control device for online maintenance of a storage battery pack according to the present invention;
fig. 3 is a schematic flow chart of a control method for online maintenance of a storage battery pack according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 10 | Bidirectional DC/DC conversion module | Ka | Charging |
| 20 | System monitor | Kb | Charging switch for |
| 30 | Charging machine | Kc | |
| 40 | Battery patrol instrument | Kd | Bidirectional DC/ |
| 50 | Discharge device | Ke | Auxiliary discharge switch |
| Kb1，Kb2，…Kbn | Storage battery maintenance switch |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides a control device for online maintenance of a storage battery pack.
Referring to fig. 1 and 2, in an embodiment of the present invention, a control device for online maintenance of a battery pack includes:
the direct current bus is connected with a charging device and a system load;
a plurality of battery maintenance switches Kb1, Kb2, … Kbn, wherein an input/output end of each battery maintenance switch Kbm is connected with a corresponding group of battery groups Bm; (1. ltoreq. m. ltoreq.n)
A bidirectional DC/DC conversion module 10, the bidirectional DC/DC conversion module 10 including a high voltage port and a low voltage port, the high voltage port of the bidirectional DC/DC conversion module 10 being connected to the DC bus, the low voltage port of the bidirectional DC/DC conversion module 10 being interconnected with another input/output terminal of the plurality of battery maintenance switches Kb1, Kb2, … Kbn;
and the system monitor 20 is connected with the plurality of storage battery maintenance switches Kb1, Kb2, … Kbn and the bidirectional DC/DC conversion module 10, and the system monitor 20 is used for controlling the plurality of storage battery maintenance switches Kb1, Kb2, … Kbn and the bidirectional DC/DC conversion module 10 to work so as to perform online maintenance on the storage battery pack.
The control device for the online maintenance of the storage battery pack further comprises: and the charger 30 is connected with the direct current bus through a charging main switch Ka.
The battery polling device 40 can collect the terminal voltage, the charging and discharging current, the voltage of a single storage battery and the terminal voltage of the storage battery pack of each storage battery group in real time, and upload the corresponding monitoring data to the system monitor 20 in real time.
The discharge device 50 is connected to the dc bus via an auxiliary discharge switch Ke.
The parallel switch Kc and the storage battery charging switch Kb are sequentially connected in series between the direct current bus and the storage battery, and two ends of the parallel switch Kc are also connected with a diode D1 in parallel.
In the embodiment, the number of the battery maintenance switches Kb1, Kb2, … Kbn and the number of the battery groups are, in an embodiment, the battery pack may be divided into n battery groups, which are respectively B1 and B2 … … Bn, the battery groups are connected in series in sequence, and in the n battery groups, each battery group is respectively connected with the battery maintenance switches Kb1, Kb2, … Kbn, battery maintenance switches Kb1, Kb2, … Kbn, and only one of them is in a closed state at the same time. The number of the single storage batteries contained in each storage battery group can be the same or different. The selection of the number of the grouped battery sections of the storage battery meets the following requirements: when the group discharge of the maintained storage battery is finished, the terminal voltage of the storage battery pack cannot be lower than the minimum required voltage of the direct current bus, and the power supply reliability of the direct current bus is ensured. The storage battery pack is connected with the direct current bus through a storage battery charging switch Kb, a parallel switch Kc or a diode D1.
The control device for online maintenance of the storage battery pack further comprises: and one end of the bidirectional DC/DC conversion switch Kd is connected with the bidirectional DC/DC conversion module 10, and the other end of the bidirectional DC/DC conversion switch Kd is connected with the direct current bus. The bidirectional DC/DC conversion module 10 includes two DC ports, a high voltage port and a low voltage port, both of which can switch input and output characteristics according to the control of the system monitor 20, and the low voltage port has a constant current control function. The high-voltage port of the bidirectional DC/DC conversion module 10 is connected to the DC bus via a bidirectional DC/DC conversion switch Kd, and the low-voltage port is connected to battery maintenance switches Kb1, Kb2, … Kbn. The bidirectional DC/DC conversion module 10 needs to communicate with the system monitor 20, and CAN communicate with the system monitor 20 by using communication buses such as RS485 or CAN, and the bidirectional DC/DC conversion module 10 is controlled by the system monitor 20, so that each storage battery group CAN discharge to the DC bus through the bidirectional DC/DC conversion module 10 when the DC/DC conversion module operates, and the DC bus CAN charge the corresponding storage battery group through the bidirectional DC/DC conversion module 10. And the low-voltage port of the bidirectional DC/DC conversion module 10 has a constant current control function, so that the constant current discharge and the equalizing charge of the storage battery groups can be realized.
When the system normally operates, the charging main switch Ka, the storage battery charging switch Kb, the parallel switch Kc and the bidirectional DC/DC conversion switch Kd are all in a closed state, the storage battery pack is in a floating charging state, when the storage battery grouping online maintenance is not performed, the storage battery maintenance switches Kb1, Kb2 and … Kbn are all in an open state, and the bidirectional DC/DC conversion module 10 is in a standby state. The ac grid supplements the storage battery with electric energy through the charger 30, and simultaneously supplies electric energy to the system load of the dc bus. The battery polling device 40 monitors the working state of the storage battery pack in real time, and particularly monitors the terminal voltage, the charging and discharging current, the voltage of a single storage battery and the terminal voltage of the storage battery pack of each storage battery pack, and uploads the monitoring result to the system monitor 20 in real time. The system monitor 20 monitors the working state of the whole system in real time, and particularly can monitor the dc bus voltage in real time and receive the monitoring result uploaded by the battery polling device 40 in real time. According to the system configuration, the system monitor 20 sets the minimum required voltage Usmin of the dc bus, the float voltage of the storage battery pack is Uf, the average charge voltage of the storage battery pack is Ue, the discharge termination voltage of a single storage battery of the storage battery pack is Ubmin, the float voltage of the storage battery group is Ubnf, the average charge voltage of the storage battery group is Ubne, and the constant current discharge current value of the storage battery group is Ibn.
The system monitor 20 monitors the working state of the whole system, and communicates with the charger 30, the bidirectional DC/DC conversion module 10, the battery polling device 40 and the discharging device 50, and the system monitor 20 can control the on-off states of the parallel switch Kc, the battery maintenance switches Kb1, Kb2, … Kbn and the auxiliary discharging switch Ke, monitor the voltage of the DC bus in real time, and receive the monitoring data of the battery polling device 40 in real time. The corresponding control strategy is preset in the system monitor 20 in advance according to the system configuration, and when the storage battery pack needs to be maintained online, the system monitor 20 controls the working states of the charger 30, the bidirectional DC/DC conversion module 10 and the discharge device 50, the parallel switch Kc, the storage battery maintenance switches Kb1, Kb2, … Kbn and the auxiliary discharge switch Ke according to the running state of the system to realize the sequential online maintenance of the storage battery groups.
In this embodiment, n battery groups can be formed by grouping and connecting the battery groups, a corresponding control strategy is preset in the system monitor 20 in advance according to the system configuration, when online maintenance is performed on any one of the battery groups in the battery groups, the battery maintenance switches Kb1, Kb2 and Kb … Kbn corresponding to the battery group in the battery maintenance switches Kb1, Kb2 and … Kbn are controlled to be closed, the bidirectional DC/DC conversion module 10 operates to output electric energy to the DC bus, so that one of the battery groups discharges at a constant current, when any single battery in the battery group reaches a discharge termination voltage, the discharge is terminated, and then the system monitor 20 controls the bidirectional DC/DC conversion module 10 to operate to output electric energy to the battery group, so that the battery groups are charged in a balanced manner and charged in a floating manner. The system monitor 20 then controls the battery maintenance switches Kb1, Kb2, … Kbn to open, and controls the bidirectional DC/DC conversion module 10 to resume the standby state, and the online maintenance of the battery group is completed. When the on-line maintenance is performed on n storage battery groups, the on-line maintenance of other storage battery groups can be sequentially performed according to the logic until the on-line maintenance of all the storage battery groups is finished, the system monitor 20 controls the switch to enable the system to recover normal operation, the system calculates the capacity of the storage battery group, and the on-line maintenance of the storage battery group is finished.
The risk of power loss of the direct-current bus in the online maintenance process of the storage battery pack is extremely low, the storage battery pack is grouped, each storage battery group is sequentially maintained online through switch switching, the low-voltage port of the bidirectional DC/DC conversion module 10 is always in a hot standby output state in the grouped discharge process of the storage batteries, and the output voltage is set to be the number of storage battery sections multiplied by the discharge termination voltage of a single storage battery, so that even if alternating-current power loss occurs in the last stage of the grouped discharge of the maintained storage batteries of the system, the terminal voltage of the storage battery pack is still in a reasonable range, the power loss fault of the direct-current bus can be avoided within a specified time, and the continuity of power supply of the system is greatly guaranteed. When the system is in a non-storage battery maintenance state, the bidirectional DC/DC conversion module 10 is in a standby state, and the normal operation of the system is not influenced. The scheme of the invention can be upgraded in the existing system, and effectively solves the problem of how to reliably realize automatic online maintenance of the storage battery pack in a direct-current power supply system. The control mode logic is clear, safe and reliable, and the system monitor 20 reasonably sets the online maintenance strategy of the storage battery pack according to the system configuration. The whole maintenance process can be automatically realized by the system monitor 20 without the participation of professional operators.
According to the invention, a plurality of storage battery maintenance switches Kb1, Kb2 and … Kbn are arranged, so that one input/output end of each storage battery maintenance switch Kbm is connected with a corresponding group of storage battery groups Bm, a high-voltage port of a bidirectional DC/DC conversion module 10 is connected with a direct-current bus, a low-voltage port of the bidirectional DC/DC conversion module 10 is connected with the other input/output ends of a plurality of storage battery maintenance switches Kb1, Kb2 and … Kbn, and a system monitor 20 is used for controlling the work of the plurality of storage battery maintenance switches Kb1, Kb2 and … Kbn and the bidirectional DC/DC conversion module 10 so as to perform online maintenance on the storage battery pack. The invention provides a safe, reliable and automatic online storage battery pack online maintenance device. The whole online maintenance process of the storage battery pack can be automatically completed by the system monitor 20 without the participation of professional operators. The problem of how to realize the automatic online maintenance of the storage battery pack is solved.
Referring to fig. 1 and 2, in an embodiment, the control device for online maintenance of the battery pack further includes:
the battery polling device 40 is connected to the plurality of battery groups B1, … Bn and the system monitor 20, and the battery polling device 40 is configured to collect terminal voltages of the battery groups and parameters of the single battery in each battery group, and output the terminal voltages and parameters to the system monitor 20, so that the system monitor 20 controls the battery charging switch Kb, the plurality of battery maintenance switches Kb1, Kb2, … Kbn and the bidirectional DC/DC conversion module 10 to operate according to the terminal voltages of the battery groups and the parameters of the single battery in each battery group detected by the battery polling device 40, so as to perform online maintenance on the battery pack.
In this embodiment, the battery pack is provided with a battery polling device 40, the battery polling device 40 needs to communicate with the system monitor 20, and CAN communicate with the system monitor 20 by using communication buses such as RS485 or CAN, the battery polling device 40 is controlled by the system monitor 20, when the battery polling device 40 is in operation, the battery pack monitors the operating state of the battery pack in real time, and CAN collect the terminal voltage and the charging and discharging current of each battery pack, and the parameters of a single battery in each battery pack, such as the voltage of the single battery and the terminal voltage of the battery pack, and upload the corresponding monitoring data to the system monitor 20 in real time.
Referring to fig. 1 and 2, in an embodiment, the system monitor 20 controls the plurality of battery maintenance switches Kb1, Kb2, … Kbn and the bidirectional DC/DC conversion module 10 to operate according to the terminal voltage of each battery group detected by the battery inspector 40, so as to perform online maintenance on the corresponding battery group (the battery group that needs online maintenance, for example, an abnormal battery group) in the battery pack.
The system monitor 20 is specifically configured to, when it is determined that an abnormal storage battery group exists in the storage battery pack according to a single battery parameter of each storage battery group detected by the battery inspector 40, close storage battery maintenance switches Kb1, Kb2, … Kbn corresponding to the abnormal storage battery group, configure a low-voltage port of the bidirectional DC/DC conversion module 10 as an input port, and configure a high-voltage port of the bidirectional DC/DC conversion module 10 as an output port, so as to control the abnormal storage battery group to perform constant-current discharge on a system load until the discharge is completed; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module 10 as an output port, and configuring a high-voltage port of the bidirectional DC/DC conversion module 10 as an input port, so as to perform equalizing charge and floating charge on the abnormal storage battery groups in sequence.
In this embodiment, during the operation of the battery polling device 40, the terminal voltage, the charging and discharging current, the voltage of a single storage battery, the terminal voltage of a storage battery pack, and the like of each storage battery pack are collected in real time, and corresponding monitoring data are uploaded to the system monitor 20 in real time, and when the system monitor 20 determines that one or more storage battery packs are abnormal according to the battery parameters collected by the battery polling device 40, such as overvoltage, undervoltage, and the like of the battery, it may be determined that the system meets the online maintenance condition of the storage battery pack, and a corresponding online maintenance process is started. After the online maintenance process is started, assuming that the battery group B1 is abnormal, the online maintenance starts from the battery group B1, the system monitor 20 controls the battery maintenance switch Kb1 to close, and simultaneously sets the low-voltage port of the bidirectional DC/DC conversion module 10 to be in an input state, the high-voltage port to be in an output state, the output voltage of the high-voltage port to be higher than the float voltage Uf of the battery pack, and sets the input constant current value of the low-voltage port to be the constant current discharge current value Ib1 of the battery group B1. And starting the bidirectional DC/DC conversion module 10, controlling and maintaining constant current discharge by the bidirectional DC/DC conversion module, enabling the storage battery group B1 to perform constant current discharge to the direct current bus through the bidirectional DC/DC conversion module 10, and maintaining the discharge current value to be Ib 1. If the discharge current value cannot reach Ib1 due to insufficient system load, the system monitor 20 will control the auxiliary discharge switch Ke to close, start the discharge device 50, and adjust the current at the dc input port of the discharge device 50 in real time, so that the battery group B1 maintains constant current discharge of Ib 1. When any one of the individual battery voltages in the battery group B1 reaches the discharge end voltage Ubmin, the battery group B1 is discharged, the system monitor 20 will control the discharging device 50 to shut down, then the bidirectional DC/DC conversion module 10 is controlled to set the high-voltage port to be in an input state, the low-voltage port to be in an output state, and the output voltage is set to be the uniform charging voltage Ub1e of the storage battery group B1, so that the charger 30 charges the storage battery group B1 in a balanced manner through the bidirectional DC/DC conversion module 10, after the balanced charging is finished, the system monitor 20 controls the low-voltage port of the bidirectional DC/DC conversion module 10 to output the floating voltage Ub1f of the storage battery group B1, and after the storage battery group B1 maintains the floating state for a specified time, the system monitor 20 controls the battery maintenance switch Kb1 to be turned off, and the bidirectional DC/DC conversion module 10 is restored to the standby state. The online maintenance process of battery grouping B1 has been completed. If other battery groups B2, B3 … … Bn are also abnormal, the online maintenance process of these battery groups B2, B3 … … Bn is similar to the online maintenance process of battery group B1, and the process is sequentially performed until all the battery groups are online maintained, and after the battery inspector 40 counts the calculated capacity of each battery group, the minimum grouped battery capacity is taken as the capacity of the battery pack, and the battery pack is sent to the system monitor 20. The online maintenance process of the abnormal battery group is finished, and the system monitor 20 controls the auxiliary discharge switch Ke to be turned off, so that the system returns to a normal operation state.
Referring to fig. 1 and 2, in an embodiment, the control device for online maintenance of the battery pack further includes:
the input end of the storage battery charging control circuit is connected with the direct current bus, the output end of the storage battery charging control circuit is connected with the storage battery pack, and when the storage battery charging switch Kb is closed, a power supply accessed from the direct current bus is output to the storage battery pack so as to charge the storage battery pack.
In this embodiment, in the system operation process, the storage battery charging switch KB is defaulted to a closed state, and the normal operation does not need to be controlled. The battery charging switch Kb is used to connect the battery pack to the dc bus, and after the on-line maintenance process is started, the system monitor 20 will first adjust the output voltage of the charger 30 to the average charging voltage Ue of the battery pack, so that the battery pack performs equalizing charging. When the equalizing charge process is completed, the system monitor 20 adjusts the output voltage of the charger 30 to the floating charge voltage of the battery pack to Uf, so that the battery pack is in a floating charge state.
Referring to fig. 1 and 2, in an embodiment, the system monitor 20 is specifically configured to control the battery charging switch Kb, the plurality of battery grouping maintenance control switches, and the bidirectional DC/DC conversion module 10 to operate according to the terminal voltage of each battery grouping detected by the battery inspector 40, so as to perform online maintenance on each battery grouping of the battery pack.
Specifically, when the storage battery pack satisfies the online maintenance condition, the system monitor 20 controls the storage battery charging switch Kb to be closed, so as to output the power supply connected from the dc bus to the storage battery pack and charge the storage battery pack;
controlling a plurality of battery maintenance switches Kb1, Kb2, … Kbn to be closed one by one according to a preset sequence;
configuring a low-voltage port of the bidirectional DC/DC conversion module 10 as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module 10 as an output port, closing the corresponding storage battery maintenance switches Kb1, Kb2 and … Kbn, and controlling storage battery packets corresponding to the storage battery maintenance switches Kb1, Kb2 and … Kbn to perform constant-current discharge on a system load until the discharge is finished; and the number of the first and second groups,
configuring a low-voltage port of the bidirectional DC/DC conversion module 10 as an output port, and configuring a high-voltage port of the bidirectional DC/DC conversion module 10 as an input port, so as to perform equalizing charging and floating charging on the storage battery groups corresponding to the storage battery maintenance switches Kb1, Kb2, … Kbn in sequence.
In the field of battery energy storage, in order to improve the safety of battery energy storage application and facilitate battery operation management, the storage battery needs to be maintained online. When the battery is subjected to charge and discharge tests to obtain the state of the battery pack, the online maintenance can be periodically carried out, or the online maintenance is triggered according to the instruction of a user. In the case of periodic online maintenance, the periodic online maintenance may be performed at a frequency such as once every three days, once every week, once every month, or once every half year, and the periodic online maintenance may be performed in a month unit, specifically, a timer may be used. When the system is triggered according to the instruction of the user, the user can output and trigger the online maintenance through an upper computer connected with the system in wired communication or an intelligent terminal connected with the system in wireless communication and the like. The above instructions are compatible with each other and can be combined in various ways to meet the online maintenance condition of the storage battery pack, the system monitor 20 judges whether the system meets the online maintenance condition of the storage battery pack in real time, and if the online maintenance condition of the storage battery pack is met, the corresponding online maintenance process is started. After the on-line maintenance process is started, the system monitor 20 will adjust the output voltage of the charger 30 to the uniform charging voltage Ue of the battery pack, so that the battery pack is charged uniformly. When the equalizing charge process is completed, the system monitor 20 adjusts the output voltage of the charger 30 to the floating charge voltage of the battery pack to Uf, so that the battery pack is in a floating charge state. The system monitor 20 controls the parallel switch Kc to be switched off, and assuming that the sequence of online maintenance is from the beginning of the battery group B1 to the end of the battery group Bn, the system monitor 20 controls the battery maintenance switch Kb1 to be switched on, and simultaneously sets the low-voltage port of the bidirectional DC/DC conversion module 10 to be in an input state, the high-voltage port to be in an output state, the output voltage of the high-voltage port is higher than the float voltage Uf of the battery pack, and the input constant current value of the low-voltage port is set to be the constant current discharge current value Ib1 of the battery group B1. And starting the bidirectional DC/DC conversion module 10, controlling and maintaining constant current discharge by the bidirectional DC/DC conversion module, enabling the storage battery group B1 to perform constant current discharge to the direct current bus through the bidirectional DC/DC conversion module 10, and maintaining the discharge current value to be Ib 1. If the discharging current value cannot reach Ib1 due to insufficient system load, the system monitor 20 closes the control switch auxiliary discharging switch Ke, starts the discharging device 50, and adjusts the current of the direct current input port of the discharging device 50 in real time, so that the battery group B1 maintains Ib1 to discharge with constant current. When any one of the individual battery voltages in the battery group B1 reaches the discharge end voltage Ubmin, the battery group B1 is discharged, the system monitor 20 will control the discharging device 50 to shut down, then, the bidirectional DC/DC conversion module 10 is controlled to set the high-voltage port to be in an input state, the low-voltage port to be in an output state, and the output voltage is set to be the equalized charging voltage Ub1e of the storage battery group B1, so that the charger 30 charges the storage battery group B1 in an equalizing way through the bidirectional DC/DC conversion module 10, after the equalized charging is finished, the system monitor 20 controls the low-voltage port of the bidirectional DC/DC conversion module 10 to output the voltage to be the floating charging voltage Ub1f of the storage battery group B1, and after the storage battery group B1 maintains the floating charging state for a specified time, the system monitor 20 controls the battery maintenance switch Kb1 to be turned off, and the bidirectional DC/DC conversion module 10 is restored to the standby state. The online maintenance process of battery grouping B1 has been completed by this time. The online maintenance process of the other battery groups B2 and B3 … … Bn is similar to the online maintenance process of the battery group B1, and is sequentially performed until all the battery groups complete online maintenance, and after the battery patrol instrument 40 counts the calculated capacity of each battery group, the minimum grouped battery capacity is taken as the capacity of the battery group, and is sent to the system monitor 20. And ending the online maintenance process of the storage battery pack. The system monitor 20 controls the switch auxiliary discharge switch Ke to be turned off, and the system recovers to a normal operation state.
Referring to fig. 1 and 2, in an embodiment, the number of the single batteries included in each battery group is the same or different, and the number of the single batteries included in the battery group satisfies: and when the group discharge of the maintained storage batteries is finished, the terminal voltage of the storage battery pack is not lower than the minimum required voltage of the direct current bus.
In the embodiment, during the grouped discharging process of the storage battery, the low-voltage port of the bidirectional DC/DC conversion module 10 is always in a hot standby output state, and the output voltage is set as the number of the nodes of the grouped storage battery of the storage battery multiplied by the discharging termination voltage Ubmin of a single storage battery, so that the voltage at the end of the storage battery is higher than the minimum required voltage of the direct current bus.
In an embodiment, the control device for online maintenance of the battery pack further includes:
a diode D1 and a parallel switch Kc, wherein the cathode of the diode D1 is connected to the DC bus, and the anode of the diode D1 is connected to the battery charging switch Kb; the parallel switch Kc is arranged in parallel with the diode D1;
the parallel switch keeps a closed state in the system operation process, and the direct current bus charges the storage battery pack through the parallel switch and the storage battery charging switch;
the system monitor 20 is further configured to control the low-voltage port of the DC/DC conversion module to operate in a hot standby output state, and control the storage battery pack to provide electric energy to the DC bus through the diode D1 when detecting a power loss fault of the ac power grid.
In this embodiment, the parallel switch is required to be controlled, the system is kept in a closed state during operation, and the direct current bus charges the whole set of storage battery through the parallel switch Kc and the storage battery charging switch Kb.
When the storage batteries need to be subjected to capacity checking in groups, the parallel switch Kc is controlled to be switched off after the balanced charging of the whole group of storage batteries is finished. The diode D1 is connected in parallel with the parallel switch Kc, when the online maintenance function of the storage battery pack is started, the parallel switch Kc is in an off state, and the parallel switch Kc is in an on state in other states of the system. In the grouping discharge process of the storage battery, the low-voltage port of the bidirectional DC/DC conversion module 10 is always in a hot standby output state, and the output voltage is set as the number of the storage battery sections of the storage battery grouping to be multiplied by the discharge termination voltage of a single storage battery. Assuming that the system alternating current power grid power loss fault occurs at the end stage of the line discharge of the battery group B1, the battery group supplies power to the direct current bus through the diode D1, and the voltage is higher than the minimum required voltage of the direct current bus. In addition, to prevent the battery group B1 from being over-discharged, the system monitor 20 controls the high voltage port of the bidirectional DC/DC conversion module 10 to be in the input state, the low voltage port to be in the output state, and the output voltage to be the floating voltage Ub1f of the battery group B1, so that the battery pack supplements the electric energy to the battery group B1 through the diode D1 and the bidirectional DC/DC conversion module 10, thereby ensuring the safe and reliable operation of the battery pack. From the above control process, it can be found that the system monitor 20 sets the storage battery pack online maintenance control strategy in advance, the storage battery pack maintenance process is automatically completed, and the storage battery pack is not separated from the system in the whole process, so that the automatic online maintenance function of the storage battery pack is realized. In the whole maintenance process of the storage battery pack, the terminal voltage of the storage battery pack is not lower than the minimum required voltage Usmmin of the direct-current bus, and even if the storage battery pack has a system alternating-current power grid power failure in the last stage of online discharge, the direct-current bus can be ensured not to have the power failure within the specified time, and the power supply continuity of the direct-current bus is ensured.
Referring to fig. 1 and 2, in an embodiment, the control device for online maintenance of the battery pack further includes:
a discharge device 50 and an auxiliary discharge switch Ke, the discharge device 50 being electrically connected to the dc bus via the auxiliary discharge switch Ke;
the system monitor 20 is further configured to control the auxiliary discharge switch Ke to be turned on/off, and control the discharge device 50 to adjust the current of the dc bus when the auxiliary discharge switch Ke is turned on.
In this embodiment, the discharging device 50 is an optional component, and when the system load is not enough to meet the battery group constant current discharging requirement, the discharging device 50 is added. The discharge device 50 may be an active inverter or a discharge meter. If an active inverter is selected, it comprises a dc port and an ac port, the dc port being connected to the dc bus via an auxiliary discharge switch Ke, the ac port being connected to the ac grid. If the discharge instrument is selected, its dc port is connected to the dc bus via an auxiliary discharge switch Ke. The discharging device 50 needs to communicate with the system monitor 20, and CAN communicate with the system monitor 20 by adopting communication buses such as RS485 or CAN, the discharging device 50 is controlled by the system monitor 20, and when the discharging device 50 works, the input current of the direct current port is adjusted in real time according to a control strategy, so that the discharging current of the storage battery group meets the requirement.
Referring to fig. 1 and 2, in an embodiment, the control device for online maintenance of the battery pack further includes:
the charging system comprises a charger 30 and a charging main switch Ka, wherein the input end of the charger 30 is connected with an alternating current power grid, and the output end of the charger 30 is connected with the direct current bus through the charging main switch Ka; the charger 30 is configured to convert ac power received from the ac power grid into dc power to supplement the battery pack and supply power to a system load of the dc bus.
In this embodiment, the charger 30 is connected to the dc bus through the charging main switch Ka. The charger 30 needs to communicate with the system monitor 20, and CAN communicate with the system monitor 20 by using communication buses such as RS485 or CAN, and the charger 30 is controlled by the system monitor 20. When the ac power grid is normal, the charger 30 converts ac power into dc power to supplement the battery pack and supply power to the system load of the dc bus. The charger 30 is generally composed of a high-frequency switching power supply module for an electric power operation power supply.
In order to better illustrate the inventive concept of the present invention, a detailed exemplary embodiment is given as follows, and as shown in fig. 1 and fig. 2, it is assumed that the system is a 220V dc system, the system normal load of the dc bus is 3A, the battery pack is 104 segments of 200Ah batteries, the equalizing charge current value is 20A, the minimum required voltage of the dc bus is 220, 0.9, 198V, the average charge voltage value of the battery pack is 104, 2.35, 244.4V, the floating charge voltage value of 104, 2.25, 234V, the battery pack is divided into 4 groups, the number of the battery segments of each battery group is 26 segments, therefore, the floating charge voltage of each battery group is 26, 2.25, 58.5V, the average charge voltage is 26, 2.35, 61.1V, the group discharge current of the battery is 20A, the discharge end voltage of a single battery is 1.8V, and the full-voltage of a single battery is 2.1V. According to the configuration, during online maintenance of the storage battery pack, the lowest end voltage which can theoretically occur to the storage battery pack is 26 × 1.8V +26 × 2.1V × 3 — 210.6V, and the requirement that the lowest required voltage of the storage battery pack is greater than 198V of the minimum required voltage of the direct-current bus is met. Since the system normal load 3A is insufficient to satisfy the discharge demand of the battery group constant current 20A, the discharge device 50 needs to be provided. The system monitor 20 has a preset control strategy according to fig. 2, and the storage battery pack online maintenance process is as follows: the system monitor 20 starts the on-line maintenance of the storage battery pack, and the system monitor 20 adjusts the output voltage of the charger 30 to the uniform charging voltage 244.4V of the storage battery pack, so that the storage battery pack is charged uniformly. When the equalizing charge process is completed, the system monitor 20 will adjust the output voltage of the charger 30 to the floating voltage of the battery pack to 234V, so that the battery pack is in a floating state. The system monitor 20 controls the parallel switch Kc to be turned off, and assuming that the online maintenance is started from the battery group B1, the system monitor 20 controls the switch battery maintenance switch Kb1 to be turned on, and simultaneously sets the low-voltage port of the bidirectional DC/DC conversion module 10 to be in an input state, the high-voltage port to be in an output state, the output voltage of the high-voltage port to be 238V higher than the float charge voltage 234V of the battery pack, and sets the input constant current value of the low-voltage port to be the constant current discharge current value 20A of the battery group B1. The system monitor 20 controls to start the bidirectional DC/DC conversion module 10, close the switch auxiliary discharge switch Ke, start the discharge device 50, and adjust the current at the DC input port of the discharge device 50 in real time, so that the battery pack B1 discharges to the DC bus at a constant current through the bidirectional DC/DC conversion module 10, and the discharge current value is maintained at 20A. When any one of the individual battery voltages in the battery group B1 reaches the discharge end voltage of 1.8V, the battery group B1 is discharged, the system monitor 20 will control the discharging device 50 to shut down, then the bidirectional DC/DC conversion module 10 is controlled to set the high-voltage port to be in an input state, the low-voltage port to be in an output state, and the output voltage is set to be the uniform charging voltage of 61.1V of the storage battery group B1, so that the charger 30 charges the storage battery group B1 for balance through the bidirectional DC/DC conversion module 10, after the balance charging is finished, the system monitor 20 controls the low-voltage port of the bidirectional DC/DC conversion module 10 to output the floating voltage of 58.5V of the storage battery group B1, and after the storage battery group B1 maintains the floating state for a specified time, the system monitor 20 controls the switch battery maintenance switch Kb1 to open, and the bidirectional DC/DC conversion module 10 is restored to the standby state. The online maintenance process of battery grouping B1 has been completed by this time. The online maintenance process of the other battery groups B2, B3, B4 is similar to the online maintenance process of the battery group B1, and is sequentially performed until all the battery groups complete online maintenance, and after the battery patrol instrument 40 counts the calculated capacity of 4 battery groups, the minimum grouped battery capacity is taken as the capacity of the battery pack, and the battery pack is uploaded to the system monitor 20. And ending the online maintenance process of the storage battery pack. The system monitor 20 controls the switch auxiliary discharge switch Ke to be turned off, and the system recovers to a normal operation state.
In particular, during the battery group discharge process, the bidirectional DC/DC conversion module 10 always sets the low-voltage port to be in the hot standby output state, and the output voltage is set to be 26 × 1.8V-46.8V. Assuming that a system alternating current power grid power loss fault occurs at the last stage of on-line discharging of the storage battery group B1, the storage battery group supplies electric energy for the direct current bus through the diode D1, and because the low-voltage port of the bidirectional DC/DC conversion module 10 is in a hot standby output state, the terminal voltage of the discharged storage battery group is not lower than 46.8V, so that the lowest terminal voltage of the storage battery group is 46.8V + 26X 2.1V X3-210.6V, and the requirement of being higher than the lowest required voltage 198V of the direct current bus is met. To prevent the battery pack B1 from being over-discharged, the system monitor 20 will immediately control the high voltage port of the bidirectional DC/DC conversion module 10 to be in the input state, the low voltage port to be in the output state and the output voltage to be the float voltage 58.5V of the battery pack B1, so that the battery pack supplements the electric energy to the battery pack B1 through the diode D1 and the bidirectional DC/DC conversion module 10, thereby ensuring the safe and reliable operation of the battery pack.
The technical scheme of the invention has clear logic of the implementation method, is safe and reliable, and effectively solves the problem of how to implement automatic online maintenance of the storage battery pack. The above description is only an example of the present invention, and does not limit the scope of the present invention.
The invention also provides a control method for the online maintenance of the storage battery pack, which is applied to the control device for the online maintenance of the storage battery pack.
Referring to fig. 3, the control method for online maintenance of the storage battery pack includes:
s100, when the storage battery pack meets online maintenance conditions, controlling the on/off of corresponding storage battery maintenance switches in the plurality of storage battery maintenance switches according to a preset control strategy;
step S200, configuring a low-voltage port of the bidirectional DC/DC conversion module as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module as an output port, and controlling a storage battery packet corresponding to the storage battery maintenance switch to perform constant-current discharge on a system load until the discharge is finished when the corresponding storage battery maintenance switch is closed; and the number of the first and second groups,
and step S300, configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and configuring a high-voltage port of the bidirectional DC/DC conversion module as an input port, so as to perform equalizing charge and floating charge on the storage batteries corresponding to the storage battery maintenance switch in groups in sequence.
In this embodiment, during the operation of the battery polling device, the terminal voltage, the charging and discharging current, the voltage of a single storage battery, the terminal voltage of a storage battery pack, and the like of each storage battery pack are collected in real time, and corresponding monitoring data are uploaded to the system monitor in real time. In the field of battery energy storage, in order to improve the safety of battery energy storage application and facilitate battery operation management, the storage battery needs to be maintained online. When the battery is subjected to charge and discharge tests to obtain the state of the battery pack, the online maintenance can be periodically carried out, or the online maintenance is triggered according to the instruction of a user. In the case of performing the periodic online maintenance, the periodic online maintenance may be performed at a frequency such as once every three days, once every week, once every month, or once every half year, or may be performed at a periodic time in a month unit, specifically, may be performed by using a timer. When the system is triggered according to the instruction of the user, the user can output and trigger the online maintenance through an upper computer connected with the system in wired communication or an intelligent terminal connected with the system in wireless communication and the like. The instructions are compatible with each other and can be combined in various modes to meet the online maintenance condition of the storage battery pack, the system monitor judges whether the system meets the online maintenance condition of the storage battery pack in real time, and if the online maintenance condition of the storage battery pack is met, a corresponding online maintenance process is started. After the on-line maintenance process is started, firstly, the system monitor adjusts the output voltage of the charger to be the uniform charging voltage Ue of the storage battery pack, so that the storage battery pack is charged uniformly. When the equalizing charge process is finished, the system monitor adjusts the output voltage of the charger to be the floating charge voltage of the storage battery pack to be Uf, so that the storage battery pack is in a floating charge state. The system monitor controls the parallel switch Kc to be switched off, and supposing that the sequence of online maintenance is from the beginning of the storage battery group B1 to the end of the storage battery group Bn, the system monitor controls the storage battery maintenance switch Kb1 to be switched on, and simultaneously sets the low-voltage port of the bidirectional DC/DC conversion module to be in an input state, the high-voltage port to be in an output state, the output voltage of the high-voltage port is higher than the float voltage Uf of the storage battery pack, and the input constant current value of the low-voltage port is set to be the constant current discharge current value Ib1 of the storage battery group B1. And starting the bidirectional DC/DC conversion module, and enabling the battery group B1 to carry out constant current discharge to the direct current bus through the bidirectional DC/DC conversion module, wherein the discharge current value is maintained in the Ib 1. If the discharging current value cannot reach Ib1 due to insufficient system load, the system monitor controls the switch auxiliary discharging switch Ke to be closed, the discharging device is started, and the current of the direct current input port of the discharging device is adjusted in real time, so that the storage battery group B1 maintains Ib1 to discharge at a constant current. When the voltage of any single storage battery in the storage battery group B1 reaches the discharge termination voltage Ubmin, the storage battery group B1 finishes discharging, the system monitor controls the discharging device to shut down, then controls the bidirectional DC/DC conversion module to set the high-voltage port to be in an input state, the low-voltage port to be in an output state, the output voltage is set to be the uniform charging voltage Ub1e of the storage battery group B1, the charger is enabled to charge the storage battery group B1 in a balanced manner through the bidirectional DC/DC conversion module, after the balanced charging is finished, the system monitor controls the low-voltage port of the bidirectional DC/DC conversion module to output the floating voltage Ub1f of the storage battery group B1, after the storage battery group B1 maintains the floating state for a specified time, the system monitor controls the storage battery maintenance switch Kb1 to be disconnected, and the bidirectional DC/DC conversion module restores to a standby state. The online maintenance process of battery grouping B1 has been completed by this time. The online maintenance process of other storage battery groups B2 and B3 … … Bn is similar to that of the storage battery group B1, and the online maintenance process is sequentially carried out until all the storage battery groups are maintained online, and after the battery patrol inspection instrument counts the calculated capacity of each storage battery group, the minimum grouped storage battery capacity is taken as the capacity of the storage battery group and is uploaded to a system monitor. And ending the online maintenance process of the storage battery pack. And the system monitor controls the switch auxiliary discharge switch Ke to be switched off, and the system recovers to a normal running state.
The invention also provides an electric power system which comprises the storage battery pack and the control device for online maintenance of the storage battery pack;
the detailed structure of the control device for the online maintenance of the storage battery pack can refer to the above embodiments, and is not described herein again; it can be understood that, because the control device for online maintenance of the storage battery pack is used in the power system of the present invention, the embodiment of the power system of the present invention includes all technical solutions of all embodiments of the control device for online maintenance of the storage battery pack, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A control device for online maintenance of a storage battery pack is characterized by comprising:
the direct current bus is connected with a charging device and a system load;
the storage battery maintenance switches are connected with one input/output end of each storage battery maintenance switch in a grouping mode;
a bidirectional DC/DC conversion module, including a high voltage port and a low voltage port, the high voltage port of the bidirectional DC/DC conversion module being connected to the DC bus, the low voltage port of the bidirectional DC/DC conversion module being interconnected to another input/output terminal of the plurality of battery maintenance switches;
and the system monitor is used for controlling the plurality of storage battery maintenance switches and the bidirectional DC/DC conversion module to work so as to perform online maintenance on the storage battery pack.
2. The apparatus for controlling online maintenance of a battery pack according to claim 1, further comprising:
the battery patrol instrument is used for acquiring the terminal voltage of each storage battery group and the parameters of the single storage battery in each storage battery group and outputting the terminal voltage and the parameters to the system monitor, so that the system monitor controls the operation of the plurality of storage battery maintenance switches and the bidirectional DC/DC conversion module according to the terminal voltage of each storage battery group and the parameters of the single storage battery in each storage battery group detected by the battery patrol instrument, and the storage battery group is maintained online.
3. The control device for online maintenance of the storage battery pack according to claim 2, wherein the system monitor is specifically configured to, when it is determined that an abnormal storage battery pack exists in the storage battery pack according to a single battery parameter of each storage battery pack detected by the battery polling instrument, control a storage battery maintenance switch corresponding to the abnormal storage battery pack to be closed, configure a low-voltage port of the bidirectional DC/DC conversion module as an input port, and configure a high-voltage port of the bidirectional DC/DC conversion module as an output port, so as to control the abnormal storage battery pack to perform constant-current discharge on a system load until the discharge is completed; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and configuring a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to perform equalizing charge and floating charge on the abnormal storage battery groups in sequence.
4. The control device for the on-line maintenance of the battery pack according to claim 2, further comprising:
the input end of the storage battery charging control circuit is connected with the direct current bus, the output end of the storage battery charging control circuit is connected with the storage battery pack, and when the storage battery charging switch is closed, a power supply accessed from the direct current bus is output to the storage battery pack so as to charge the storage battery pack.
5. The control device for the online maintenance of the storage battery pack according to claim 2, wherein the system monitor controls the plurality of storage battery maintenance switches to be turned on/off one by one according to a preset sequence, particularly when the storage battery pack meets an online maintenance condition;
configuring a low-voltage port of the bidirectional DC/DC conversion module as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module as an output port, closing the corresponding storage battery maintenance switch, and controlling a storage battery packet corresponding to the storage battery maintenance switch to perform constant-current discharge on a system load until the discharge is finished; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to sequentially perform equalizing charge and floating charge on the storage batteries corresponding to the storage battery maintenance switch in groups.
6. The control device for the online maintenance of the storage battery pack according to any one of claims 3 or 5, wherein the number of the single storage batteries in each storage battery group is the same or different, and the number of the single storage batteries in the storage battery group satisfies the following conditions: and when the group discharge of the maintained storage batteries is finished, the terminal voltage of the storage battery pack is not lower than the minimum required voltage of the direct current bus.
7. The control device for the online maintenance of a storage battery pack according to any one of claims 4 or 5, further comprising:
the cathode of the diode is connected with the direct current bus, and the anode of the diode is connected with the storage battery charging switch; the parallel switch is arranged in parallel with the diode; the parallel switch keeps a closed state in the system operation process, and the direct current bus charges the storage battery pack through the parallel switch and the storage battery charging switch;
the system monitor is also used for controlling a low-voltage port of the DC/DC conversion module to work in a hot standby output state and controlling the storage battery pack to provide electric energy for the storage batteries in groups through the diodes when detecting the power loss fault of the alternating current power grid.
8. The control device for the on-line maintenance of the storage battery pack according to any one of claims 1 to 5, further comprising:
the discharging device is electrically connected with the direct current bus through the auxiliary discharging switch;
the system monitor is further used for controlling the auxiliary discharge switch to be turned on/off, and controlling the discharge device to regulate the current of the direct current bus when the auxiliary discharge switch is turned off.
9. A control method for online maintenance of a storage battery pack, which is applied to the control device for online maintenance of a storage battery pack according to any one of claims 1 to 8, wherein the control device for online maintenance of a storage battery pack comprises a plurality of storage battery maintenance switches, a bidirectional DC/DC conversion module, a system monitor and a battery patrol instrument; the control method for the online maintenance of the storage battery pack comprises the following steps:
when the storage battery pack meets the online maintenance condition, controlling the on/off of the corresponding storage battery maintenance switches in the plurality of storage battery maintenance switches according to a preset control strategy;
configuring a low-voltage port of the bidirectional DC/DC conversion module as an input port, configuring a high-voltage port of the bidirectional DC/DC conversion module as an output port, and controlling a storage battery packet corresponding to the storage battery maintenance switch to perform constant-current discharge on a system load until the discharge is finished when the corresponding storage battery maintenance switch is closed; and the number of the first and second groups,
and configuring a low-voltage port of the bidirectional DC/DC conversion module as an output port, and a high-voltage port of the bidirectional DC/DC conversion module as an input port so as to sequentially perform equalizing charge and floating charge on the storage battery groups corresponding to the storage battery maintenance switch.
10. An electric power system comprising a battery pack and a control device for on-line maintenance of the battery pack according to any one of claims 1 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115001114A (en) * | 2022-07-19 | 2022-09-02 | 深圳奥特迅电力设备股份有限公司 | Circuit, control method and system for keeping group voltage balance of storage battery |
| CN116683060A (en) * | 2023-08-01 | 2023-09-01 | 深圳奥特迅电力设备股份有限公司 | Storage battery pack maintenance method, storage battery pack maintenance device, terminal equipment and storage medium |
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- 2022-03-08 CN CN202210229155.7A patent/CN114628804A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115001114A (en) * | 2022-07-19 | 2022-09-02 | 深圳奥特迅电力设备股份有限公司 | Circuit, control method and system for keeping group voltage balance of storage battery |
| CN116683060A (en) * | 2023-08-01 | 2023-09-01 | 深圳奥特迅电力设备股份有限公司 | Storage battery pack maintenance method, storage battery pack maintenance device, terminal equipment and storage medium |
| CN116683060B (en) * | 2023-08-01 | 2024-02-02 | 深圳奥特迅电力设备股份有限公司 | Storage battery pack maintenance method, storage battery pack maintenance device, terminal equipment and storage medium |
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