CN116780721A - BMS control method for optimizing energy storage battery cluster - Google Patents
BMS control method for optimizing energy storage battery cluster Download PDFInfo
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- CN116780721A CN116780721A CN202311021208.7A CN202311021208A CN116780721A CN 116780721 A CN116780721 A CN 116780721A CN 202311021208 A CN202311021208 A CN 202311021208A CN 116780721 A CN116780721 A CN 116780721A
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Abstract
The invention discloses a BMS control method for optimizing an energy storage battery cluster, and relates to the technical field of energy storage battery optimization. The invention utilizes a BMS secondary control system to detect the battery side voltage at first, and when the battery side voltage reaches a qualified value, the switch-on breaker Q1 is allowed; after the breaker Q1 is normally closed, the battery system is used for normally supplying power for the PCS or the direct current bus; when the battery is charged and discharged or the battery is self-lost, the standard of the three-level fault point of the BMS is reached, and at the moment, the secondary control system of the BMS outputs a breaker switching-off signal to break off the breaker Q1 so as to realize the protection of the battery system; after three-level protection of the BMS, the breaker Q1 is manually switched on, and after the breaker Q1 is switched on, whether the breaker Q1 needs to be switched off again is confirmed by utilizing a BMS secondary control system through detection and charging and discharging processes of a battery system. The invention reduces the complicated logic functions of controlling and detecting the contact device and the pre-charging loop of the BMS by optimizing the control logic of the BMS management system.
Description
Technical Field
The invention relates to the technical field of energy storage battery optimization, in particular to a BMS control method for optimizing an energy storage battery cluster.
Background
The existing battery cluster high-voltage box consists of a BMS, a contactor, a fuse, a circuit breaker, a current acquisition device and the like, and has the problems of complex loop, complicated control and the like;
as shown in fig. 4, the control logic in the high-voltage box is to switch on the breaker Q1 first, detect the voltage between BAT + \bat-, switch on the switch K2, and then switch on the switch K3, after the precharge voltage reaches a certain value, switching on the gate K2 and switching off the gate K3, wherein the control logic is complex, and the problem point is difficult to find; meanwhile, when the battery system is in fault or needs to be protected, the BMS realizes the disconnection of the battery system and the PCS or the direct current bus by disconnecting the K1 and K2 contactors, so as to protect the battery system, but the PCS is in operation, the K1 and K2 contactors can be switched off when current passes through the PCS, so that the contactor contacts cause electric arcs, the service lives of the contactors are seriously influenced, and the safety risk is brought to the battery system; for this reason, the present solution proposes a BMS control method for optimizing an energy storage battery cluster.
Disclosure of Invention
The present invention aims to provide a control method for optimizing an energy storage battery cluster BMS, which simplifies and improves a control system by optimizing a design scheme of the system, thereby solving the problems set forth in the background.
The invention is realized by the following technical scheme:
the invention relates to a BMS control method for optimizing an energy storage battery cluster, which comprises a BMS secondary control system, a breaker Q1 and a battery system, and comprises the following steps:
s1: firstly, detecting the battery side voltage by using the BMS secondary control system, and allowing the switch-on breaker Q1 to be switched on when the battery side voltage reaches a qualified value;
s2: after the breaker Q1 is normally closed, the battery system is utilized to normally supply power for a PCS or a direct current bus, and a BMS controller in a BMS secondary control system judges the state of the battery system through current acquisition, voltage acquisition and primary core data acquisition;
s3: when the battery is charged and discharged or the battery is self-lost, the standard of the three-level fault point of the BMS is reached, and at the moment, the secondary control system of the BMS outputs a breaker switching-off signal to break off the breaker Q1 so as to realize the protection of the battery system;
s4: after three-level protection of the BMS, the breaker Q1 is manually switched on, and after the breaker Q1 is switched on, whether the breaker Q1 needs to be switched off again is confirmed by utilizing a BMS secondary control system through detection and charging and discharging processes of a battery system.
In the step S1, when the voltage at the battery side does not reach the acceptable value, the BMS controller in the BMS secondary control system is always in the state of opening the circuit breaker Q1, and does not allow the circuit breaker Q1 to be closed.
And in the step S2, the BMS controller judges the state of the battery system, protects the battery system in real time, and outputs an alarm signal to the PCS or the EMS when the primary and secondary faults of the battery system occur.
In the step S4, when the battery system is in three-level low-voltage protection, the breaker Q1 is opened, after the breaker Q1 is closed, the BMS controller detects that the battery system is still in three-level low-voltage fault, at this time, the charging state of the battery system is judged, when the battery is charged within 5 minutes, the closing of the breaker Q1 is continuously maintained until the low-voltage fault of the battery disappears, and when the battery is not detected to be charged within 5 minutes, the breaker Q1 is opened again, so as to protect the battery system.
In the step S4, when the battery system is in three-level high-voltage protection, the breaker Q1 is opened, after the breaker Q1 is closed, the BMS controller detects that the battery system is still in three-level high-voltage fault, at this time, determines the charging state of the battery system, when the battery is charged in 5 minutes, the breaker Q1 is opened to protect the battery system, and when the battery is not charged in 5 minutes, the breaker Q1 is kept closed.
The invention has the following beneficial effects:
the method is used for optimizing the control method of the energy storage battery cluster BMS, optimizing the control logic of the BMS management system, and reducing the complicated logic functions of the BMS, such as control and detection of a contactor and a pre-charging loop.
The method is used for optimizing the control method of the energy storage battery cluster BMS, and can effectively avoid potential safety hazards caused by the breaking arc carried by the contactor of the battery high-voltage box to a battery system and system faults caused by the damage of the contactor.
The method for optimizing the control method of the energy storage battery cluster BMS breaks through the technology that the energy storage system battery cluster management depends on a contactor and a pre-charging loop, changes the design of a high-voltage box and the connection of a main circuit, and plays a positive role in reducing the cost and enhancing the efficiency of an energy storage system.
The method for optimizing the control method of the energy storage battery cluster BMS can solve the problem that the energy storage system realizes the black start function of the energy storage system under the condition of no UPS, and perfectly solves the problem that the battery system of the energy storage system is adopted as a powerful backup power supply, thereby indirectly reducing the cost increase of the system caused by the black start function.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating an operation of a method for optimizing a control of an energy storage battery cluster BMS according to the present invention;
fig. 2 is a control logic diagram for optimizing a battery cluster BMS according to the present invention;
fig. 3 is a diagram of a secondary control system of the battery cluster manager BMS according to the present invention;
fig. 4 is a flow chart of the control in the high-voltage box of the battery cluster in the prior art.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 3, the present invention is a BMS control method for optimizing an energy storage battery cluster, which includes a BMS secondary control system, a circuit breaker Q1 and a battery system, and the control method is as follows:
the BMS secondary control system firstly detects the voltage of the battery side, if the voltage of the battery side reaches a qualified value, the breaker Q1 is allowed to be closed, otherwise, the controller is always in the state of opening the breaker, and the breaker is not allowed to be closed;
after the breaker Q1 is normally closed, the battery system normally supplies power for the PCS or the direct current bus, and the BMS controller judges the state of the battery system through current acquisition, voltage acquisition and primary electric core data acquisition; the battery system is protected in real time, and when the primary and secondary faults of the battery system occur, an alarm signal is output to PCS or EMS (the control protection scheme is the same as the original BMS control logic);
when the battery is charged and discharged or the battery is self-lost, the standard of three-level fault points of the BMS is achieved, and the BMS outputs a breaker switching-off signal to break the breaker so as to realize the protection of the battery system;
after three-level protection of the BMS, the breaker needs to be manually switched on, and after the breaker is switched on, the BMS confirms whether the breaker needs to be switched off again or not through the detection, charge and discharge processes of the battery system;
when the battery system is in three-level low-voltage protection, the breaker is disconnected, after the breaker is closed, the BMS detects that the battery system is still in three-level low-voltage fault, the charging state of the battery system is judged at the moment, and when the battery is charged within 5 minutes, the breaker is continuously kept closed until the low-voltage fault of the battery disappears; when the charging of the battery is not detected within 5 minutes, the breaker is opened again, so that the battery system is protected;
when the battery system is in three-level high-voltage protection, the breaker is opened, after the breaker is closed, the BMS detects that the battery system is still in three-level high-voltage fault, the charging state of the battery system is judged at the moment, when the battery system is charged in 5 minutes, the breaker is opened to protect the battery system, and when the battery is not charged in 5 minutes, the breaker is kept closed.
According to the invention, through BMS management of the battery clusters in the energy storage system, the circuit of the main loop is optimized, the control logic of the BMS is improved, and the improvement of simplicity, high efficiency and reliability of the design of the energy storage system BMS is facilitated; particularly, the BMS control is required to reduce the control of the contactor, the judgment of the precharge voltage and the control of the precharge loop; the protection of the battery system is realized through the control of the circuit breaker, and the safety and the reliability of the battery system are greatly improved by utilizing the reliable arc extinguishing device of the circuit breaker and high breaking times.
According to the invention, in the energy storage battery cluster management, the BMS realizes the protection of a battery system by controlling the circuit breaker, so that the use of a contactor and a pre-charging loop is reduced; the battery system is optimized by the BMS through a similar BMS management control strategy, and the battery cluster main circuit is optimized by any breaker, fusion switch or switch with an arc extinguishing device, so that the aims of reducing cost and enhancing efficiency are achieved through the optimized design of the battery main circuit and the elimination of contactors.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The BMS control method for optimizing the energy storage battery cluster comprises a BMS secondary control system, a breaker Q1 and a battery system, and is characterized by comprising the following steps of:
s1: firstly, detecting the battery side voltage by using the BMS secondary control system, and allowing the switch-on breaker Q1 to be switched on when the battery side voltage reaches a qualified value;
s2: after the breaker Q1 is normally closed, the battery system is utilized to normally supply power for a PCS or a direct current bus, and a BMS controller in a BMS secondary control system judges the state of the battery system through current acquisition, voltage acquisition and primary core data acquisition;
s3: when the battery is charged and discharged or the battery is self-lost, the standard of the three-level fault point of the BMS is reached, and at the moment, the secondary control system of the BMS outputs a breaker switching-off signal to break off the breaker Q1 so as to realize the protection of the battery system;
s4: after three-level protection of the BMS, the breaker Q1 is manually switched on, and after the breaker Q1 is switched on, whether the breaker Q1 needs to be switched off again is confirmed by utilizing a BMS secondary control system through detection and charging and discharging processes of a battery system.
2. The method for optimizing the control of the energy storage battery cluster BMS according to claim 1, wherein in S1, when the battery side voltage does not reach the acceptable value, the BMS controller in the BMS secondary control system is always in the state of opening the circuit breaker Q1, and does not allow the circuit breaker Q1 to be closed.
3. The BMS control method for optimizing an energy storage battery cluster according to claim 1, wherein the BMS controller determines a state of the battery system in S2 and protects the battery system in real time, and outputs an alarm signal to the PCS or EMS when the primary and secondary faults of the battery system occur.
4. The method for optimizing the control of the energy storage battery cluster BMS according to claim 1, wherein in S4, when the battery system is in three-level low voltage protection, the circuit breaker Q1 is opened, after the circuit breaker Q1 is closed, the BMS controller detects that the battery system is still in three-level low voltage fault, determines the charging state of the battery system at this time, keeps the circuit breaker Q1 closed until the low voltage fault of the battery disappears when the battery is charged for 5 minutes, and opens the circuit breaker Q1 again when the battery is not charged for 5 minutes, thereby protecting the battery system.
5. The method for optimizing the control of the energy storage battery cluster BMS according to claim 1, wherein in S4, when the battery system is in three-level high voltage protection, the circuit breaker Q1 is opened, after the circuit breaker Q1 is closed, the BMS controller detects that the battery system is still in three-level high voltage fault, determines the charging state of the battery system at this time, opens the circuit breaker Q1 to protect the battery system when charging the battery within 5 minutes, and keeps the circuit breaker Q1 closed when not detecting charging the battery within 5 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311021208.7A CN116780721A (en) | 2023-08-15 | 2023-08-15 | BMS control method for optimizing energy storage battery cluster |
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Cited By (1)
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| CN117833323A (en) * | 2024-03-05 | 2024-04-05 | 中国华能集团清洁能源技术研究院有限公司 | High-voltage direct-hanging energy storage system, black start method thereof, electronic equipment and storage medium |
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