CN218102655U - High pressure control system - Google Patents

Abstract

The utility model provides a high-pressure control system, high-pressure control system includes: the system comprises a primary loop, a DC/DC converter, a wiring terminal and a secondary control loop, wherein the primary loop is connected with a battery cluster; the DC/DC converter is selectively connected with the battery cluster; the internal wiring port of the wiring terminal is connected with the DC/DC converter, and the external wiring port of the wiring terminal is selectively connected with a reserved power interface of the power grid through the power converter; the controller is arranged on the secondary control loop, a secondary power supply of the secondary control loop can be selectively provided by the battery cluster and the power grid, and the controller is used for cutting off the power supply of the battery cluster under the condition that the battery is over-discharged when the secondary power supply is provided by the battery cluster so as to protect the energy storage battery. By adopting the high-voltage control system, the reliability of the secondary power supply is improved, the reliability of the system operation is indirectly improved, the performance of the protection battery can be effectively improved, and the problem of poor safety of an energy storage system in the prior art is solved.

Description

High pressure control system

technical field

The utility model relates to the technical field of energy storage, in particular to a high-voltage control system.

Background technique

The important role of energy storage technology in improving the power grid's ability to accept new energy, power grid frequency regulation, peak shaving and valley filling, and improving power quality and power reliability has reached an international consensus. In recent years, with the continuous maturity of electrochemical energy storage technology and the rapid decline in cost, my country's electrochemical energy storage has grown rapidly. The total installed capacity has increased from 105MW in 2015 to 1.034GW in 2018, an annual increase of 114%.

In recent years, battery energy storage system accidents have occurred frequently: since 2017, more than 20 energy storage power station accidents have occurred in Korean batteries; on April 16, 2021, the Beijing Fengtai Jimei energy storage power station explosion accident; A fire broke out at the Tesla energy storage power station...severely affected the trust of the government, industry and the public in the energy storage industry, and greatly restricted the healthy development of the energy storage industry. Therefore, there is a problem of poor security of the energy storage system in the prior art, and it is very necessary to improve the design reliability of the energy storage system.

The high-voltage control box is the high-voltage power circuit management unit of the energy storage system, and is an intermediate unit connecting the battery cluster and the energy storage converter. The high-voltage control box has battery cluster voltage, battery cluster current collection, battery cluster circuit contactor control and protection, etc. Function. Circuit breakers, contactors, fuses, circulation control circuits, current sensors, battery cluster control management modules (main control), etc. are installed in the high-voltage control box. With CAN and RS-485 communication bus interface, it can realize the connection between the high-voltage control box and the energy storage battery management module (slave control), the energy storage battery management system host (display control), energy storage converter, energy management system and fire protection system The control and communication functions among them realize the control, protection and data management of the energy storage battery cluster. The high-voltage control box is undoubtedly a key component for the safe and stable operation of the energy storage system. The realization of the above functions is inseparable from the supply of the secondary power supply of the system. Ensuring the reliability of the secondary power supply of the system plays a key role in the stable operation of the entire energy storage system.

However, the secondary power supply of the existing energy storage system is single, and the traditional secondary power source is used to supply power to the grid. When the grid fails, it will switch to UPS equipment for short-term power supply. In the event of a power outage, the energy storage system will stop operating.

Utility model content

The main purpose of the utility model is to provide a high-voltage control system to solve the problem of poor safety of the energy storage system in the prior art.

In order to achieve the above object, according to one aspect of the utility model, a high-voltage control system is provided, including: a primary circuit, the primary circuit is connected to the battery cluster; a DC/DC converter, the DC/DC converter is selectively connected to the battery cluster Connection; wiring terminal, the internal wiring port of the wiring terminal is connected to the DC/DC converter, and the external wiring port of the wiring terminal is selectively connected to the reserved power interface of the power grid through the power converter; secondary control loop, secondary control loop There is a controller on the top, the secondary power supply of the secondary control loop can be provided by the battery cluster and the grid selectively, and the controller is used to cut off the power supply of the battery cluster when the battery is over-discharged when the secondary power supply is provided by the battery cluster .

Further, the DC/DC converter is selectively connected to the battery clusters by controlling the switches.

Further, the primary circuit is connected with the converter.

Further, a circuit breaker is provided on the primary circuit.

Further, the primary circuit includes a positive circuit and a negative circuit, and a contactor is arranged on the positive circuit.

Further, a pre-charging resistor and a pre-charging relay are arranged on the positive circuit, the pre-charging resistor and the pre-charging relay are arranged in series, and the pre-charging resistor and the pre-charging relay are arranged in parallel with the contactor.

Further, a shunt is provided on the negative circuit.

Further, the power converter is selectively connected to the reserved power interface of the power grid through a switch.

Applying the technical scheme of the utility model, the secondary power supply of the secondary control loop can be provided selectively by the battery cluster and the power grid, wherein, when provided by the battery cluster, the secondary power supply of the secondary control loop comes from the inside of the high-voltage control system, specifically , through the DC/DC converter inside the high-voltage control system, the power supply of the battery cluster is converted into the secondary power required by the secondary control loop. When the secondary power supply inside the high-voltage control system operates reliably, the controller maintains normal operation , and communicate with the internal battery management system in real time and collect battery data, judge whether the battery is over-discharged according to the collected battery information, and if it is determined that the battery is over-discharged, automatically cut off the energy storage system through the control The battery cluster power supply mode protects the energy storage battery. And in the case of cutting off the battery cluster power supply mode, the external wiring port of the terminal block is connected to the power interface reserved by the power grid through the power converter. At this time, the power grid provides the secondary power supply for the secondary control loop, that is, the secondary The secondary power of the control loop comes from outside the high-voltage control system. Specifically, by configuring a power converter at the external wiring port of the terminal block, the power grid or other power sources are converted to provide secondary power, so that the energy storage system can be restarted. , and then realize the timely maintenance of the energy storage system, prolong the service life of the battery, and ensure the reliability of the energy storage system to the greatest extent. Adopting the high-voltage control system of the present application improves the reliability of the secondary power supply, indirectly improves the reliability of the system operation, effectively improves the performance of the protection battery, and solves the problem of poor safety of the energy storage system in the prior art.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows a schematic structural view of an embodiment of a high-voltage control system according to the present invention;

Fig. 2 shows a schematic structural diagram of an embodiment of the secondary control loop of the high voltage control system according to the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Primary circuit; 11. Circuit breaker; 12. Contactor; 13. Pre-charging resistor; 14. Pre-charging relay; 15. Shunt; 16. Fuse;

20. Battery cluster;

30. Terminal block;

40. Power grid;

51. Power converter; 52. DC/DC converter;

60. Converter;

70. Control switch;

80. Switch.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. These example embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. The thicknesses of layers and regions are indicated, and the same reference numerals are used to designate the same devices, and thus their descriptions will be omitted.

As shown in FIG. 1 and FIG. 2 , according to a specific embodiment of the present application, a high-voltage control system is provided.

Specifically, the high voltage control system includes a primary loop 10, a DC/DC converter 52, a connection terminal 30 and a secondary control loop. The primary circuit 10 is connected to the battery cluster 20, the DC/DC converter 52 is selectively connected to the battery cluster 20, the internal connection port of the connection terminal 30 is connected to the DC/DC converter 52, and the external connection port of the connection terminal 30 is converted by power The controller 51 is selectively connected to the reserved power interface of the power grid 40, and a controller is provided on the secondary control loop. The secondary power supply of the secondary control loop is optionally provided by the battery cluster 20 and the grid 40. When the secondary power supply is provided by the battery cluster 20, when the battery is over-discharged, the power supply of the battery cluster 20 is cut off.

Applying the technical solution of this embodiment, the secondary power supply of the secondary control loop can be optionally provided by the battery cluster and the power grid, wherein, when provided by the battery cluster, the secondary power supply of the secondary control loop comes from the inside of the high-voltage control system, specifically The DC/DC converter inside the high-voltage control system converts the power supply of the battery cluster 20 into the secondary power required by the secondary control loop. When the secondary power supply inside the high-voltage control system operates reliably, the controller (Fig. The BMU in 2) maintains normal operation, and communicates with the internal battery management system in real time and collects battery data. According to the collected battery information, it is determined whether the battery is over-discharged. If it is determined that the battery is over-discharged, the controller will The control automatically cuts off the power supply mode of the battery cluster 20 of the energy storage system to protect the energy storage battery. And in the case of cutting off the power supply mode of the battery cluster 20, the external connection port of the terminal block 30 is connected to the power interface reserved by the power grid 40 through the power converter 51. At this time, the power grid 40 provides the secondary power supply for the secondary control loop. That is, at this time, the secondary power supply of the secondary control loop comes from the outside of the high-voltage control system. Specifically, by configuring the power converter 51 at the external connection port of the terminal block 30, the secondary power supply is provided by the power grid 40 or other power sources after power conversion. (as shown by the dotted line in Figure 1), so that the energy storage system can be restarted, and then the energy storage system can be replenished and maintained in time, the service life of the battery can be extended, and the reliability of the energy storage system can be guaranteed to the greatest extent. Adopting the high-voltage control system of the present application improves the reliability of the secondary power supply, indirectly improves the reliability of the system operation, effectively improves the performance of the protection battery, and solves the problem of poor safety of the energy storage system in the prior art. In this embodiment, the power converter 51 may be an AC/DC converter or a DC/DC converter.

According to one specific embodiment of the present application, the DC/DC converter 52 is responsible for converting the high voltage of the battery cluster 20 into a 24V power supply used by the energy storage system, and of course it can also be converted into a 48V power supply or other power supplies that can ensure the normal operation of the energy storage system power supply. The connection terminal 30 is responsible for internal and external communication wiring connections, power supply input and output connections, etc. of the high voltage control system.

Further, the DC/DC converter 52 is selectively connected to the battery cluster 20 through the control switch 70 . In this embodiment, the control switch 70 has a shunt tripping protection function. When the circuit loop containing the control switch 70 has an overcurrent operation, the control switch 70 will trip through the internal thermal magnetic trip coil to cut off the battery cluster. 20 to provide power, thereby protecting the circuit loop including the control switch 70.

Further, the primary circuit 10 is connected with the converter 60 . Wherein, a circuit breaker 11 is provided on the primary circuit 10 . The circuit breaker 11 has a shunt trip, and when an overcurrent occurs in the energy storage system, the thermal magnetic trip function inside the circuit breaker 11 is used to realize tripping protection. When an unpredictable failure occurs in the energy storage system, the BMS issues an emergency cut-off command, which can safely and quickly cut off the live circuit of the battery cluster 20 during charging or discharging. When a fire occurs in the energy storage system or an emergency stop signal is artificially activated externally, the circuit breaker 11 can quickly perform shunt trip protection to ensure the safety of the entire energy storage system. When the energy storage system is powered on or off for the first time, the circuit breaker 11 can be manually closed or disconnected to control the on-off between the primary circuit 10, the battery cluster 20 and the converter 60, which improves the safety of the energy storage system sex.

Further, the primary circuit 10 includes a positive circuit and a negative circuit, and a contactor 12 is arranged on the positive circuit. The contactor 12 is closed and cut off according to the working condition requirements of the charging and discharging operation of the battery, so as to meet the operation requirements of the energy storage system.

In an exemplary embodiment of the present application, a fuse 16 is also provided on the positive circuit. Among them, the fuse 16 has a quick cut-off capability, which can quickly cut off the circuit when the circuit containing the battery cluster 20 and the primary circuit 10 has a short circuit or a large current, so as to ensure the safety of the battery cluster 20 and the primary circuit 10 .

Further, a pre-charging resistor 13 and a pre-charging relay 14 are arranged on the positive circuit, the pre-charging resistor 13 and the pre-charging relay 14 are arranged in series, and the pre-charging resistor 13 and the pre-charging relay 14 are arranged in parallel with the contactor 12 . The circuit including the pre-charging resistor 13 and the pre-charging relay 14 is a pre-charging circuit. The contactor 12 can be protected through the pre-charging circuit. When more than 20 battery clusters are connected in parallel and then connected to the converter 60, the pre-charging circuit can balance multiple clusters. The current between the battery clusters 20 prevents the loop current containing the battery clusters 20 from being too large, and improves the reliability and safety of the energy storage system.

Further, a shunt 15 is provided on the negative circuit. The shunt 15 is responsible for collecting current information during the operation of the battery cluster 20 .

Further, the power converter 51 is selectively connected to the reserved power interface of the grid 40 through the switch 80 .

Wherein, the BMU is electrically connected with the battery cluster 20, the circuit breaker 11, the contactor 12, the pre-charging relay 14 and the control switch 70, and the BMU is used to control the connection of the circuit breaker 11, the contactor 12, the pre-charging relay 14 and the control switch 70. broken. The BMU is the core control component of the high-voltage control system. It has temperature collection in the high-voltage control system, control and protection of the contactor 12, cut-off protection of the circuit breaker 11, cut-off protection of the control switch 70, control of the pre-charging relay 14 and from Control power control and other functions. BMU also has CAN and RS-485 communication bus interfaces, which can realize high-voltage control system and energy storage battery management module (slave control), energy storage battery management system host (display control), converter 60, energy management system and fire protection system The control and communication functions between them, as well as the control, protection and data management of the battery cluster 20. Among them, the control switch 70 is to ensure the normal operation of the BMS power supply, the shunt protection function of the circuit breaker 11, the closing function of the contactor 12, the pre-charging function of the circuit including the pre-charging relay 14, and the operation of the temperature-controlled fan of the energy storage system. Such as the basic components of the required power supply. The control switch 70 has a shunt trip protection function. When the energy storage system is over-current, the control switch 70 receives a control command from the BMU and cuts off quickly to protect the energy storage system.

As shown in FIG. 2 , the BMU has multiple terminals, some of which are connected to intermediate relays (KA1, KA2, KA3 and KA4 in FIG. 2). Among them, the intermediate relay is the control part of each shunt release, slave control power output, etc. When the system is normal, the BMU realizes the closure and disconnection of the main positive contactor KM1 (that is, the contactor 12 on the primary circuit 10) through the control of the KA1 intermediate relay, and the BMU realizes the closure of the pre-charge relay 14 through the control of KM2, so as to To realize the pre-charging function, the BMU realizes the on-off of the output of the slave control power supply through the control of the KA2 intermediate relay. And one of the terminals of the main control module (BMU) of the battery management system is connected to the normally closed switch of the fire start system. When a fire occurs in the energy storage system, the fire system starts the linkage fire protection, and the normally closed switch disconnects the action, and the BMU receives a signal Start the delay command (the specific delay time can be set), and quickly act on the KA4 coil, the normally open contact of KA4 is closed, and the circuit breaker QF1 performs shunt trip protection, that is, the circuit breaker 11 on the primary circuit 10 is disconnected, Complete the delay. After that, the KA3 coil is activated, the normally open contact of KA3 is closed, and the control switch QF2 is tripped for protection, that is, the control switch 70 in FIG. The protection function of the energy storage system.

With the high-voltage control system of the present application, when the grid is normally powered, the user can choose to be powered by the system battery cluster 20 or the grid 40 according to his own needs, and can only choose one of the two.

1) When the grid 40 power supply mode is used, the control switch 70 needs to be manually disconnected, and the switch 80 is closed. The external connection port of the terminal 30 (connection port at F in FIG. 1 ) is connected to the 24V reserved by the power converter 51 and the grid 40 The power supply interface is connected to supply power to the secondary control loop through the internal wiring port of the terminal block 30 (the wiring port at E in FIG. 1 ).

2) When the battery cluster 20 is used as the secondary power supply, the control switch 70 needs to be manually closed for the first power-on, and the switch 80 is turned off at this time, and the internal wiring port of the terminal 30 (the wiring port at E in FIG. 1 ) is passed through the DC/ The DC converter 52 is connected to the battery cluster 20, and supplies power to the secondary control circuit through the external connection port of the connection terminal 30 (the connection port at F in FIG. 1 ).

When choosing to be powered by the system battery cluster 20, the BMU judges the voltage data collected by the battery through the slave controller. When it is determined that the battery is seriously over-discharged, the BMU outputs a signal to control the action of the KA3 relay, thereby tripping the circuit breaker 11 and stopping the battery cluster. 20 continue to provide secondary power for the energy storage system, so as to achieve the purpose of protecting the energy storage battery.

When normally powered by the battery cluster 20, the 24V power indicator light of the secondary control circuit (as shown in Figure 2) is in a light-on state. If the light goes out suddenly, after removing the component failure, manually close the circuit breaker 11, and the circuit breaker The switch 11 has been in the shunt tripping state. At this time, it can be determined that the battery of the energy storage system is in a serious over-discharge state. At this time, it is necessary to use the power supply mode of the grid 40 to supply power for the secondary control circuit, and normally start the energy storage system to charge the battery. Power replenishment operation, so as to achieve the purpose of protecting the battery of the energy storage system in time.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition to the above, it also needs to be explained that "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to specific features, structures or Features are included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure or characteristic is described in combination with any embodiment, it should be claimed that realizing such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. A high-voltage control system, characterized in that, comprising: A primary circuit (10), the primary circuit (10) is connected to the battery cluster (20); a DC/DC converter (52), the DC/DC converter (52) being selectively connected to the battery cluster (20); A connection terminal (30), the internal connection port of the connection terminal (30) is connected to the DC/DC converter (52), and the external connection port of the connection terminal (30) is selectively connected to the power converter (51) The ground is connected to the reserved power interface of the grid (40); A secondary control loop, the secondary control loop is provided with a controller, the secondary power supply of the secondary control loop is optionally provided by the battery cluster (20) and the power grid (40), the control The device is used for cutting off the power supply of the battery cluster (20) when the battery is over-discharged when the secondary power supply is provided by the battery cluster (20). 2. The high pressure control system according to claim 1, characterized in that, The DC/DC converter (52) is selectively connected to the battery cluster (20) through a control switch (70). 3. The high pressure control system according to claim 1, characterized in that, The primary circuit (10) is connected with a converter (60). 4. The high pressure control system according to claim 1, characterized in that, A circuit breaker (11) is arranged on the primary circuit (10). 5. The high pressure control system according to claim 4, characterized in that, The primary circuit (10) includes a positive circuit and a negative circuit, and a contactor (12) is arranged on the positive circuit. 6. The high pressure control system according to claim 5, characterized in that, The positive circuit is provided with a pre-charging resistor (13) and a pre-charging relay (14), the pre-charging resistor (13) and the pre-charging relay (14) are arranged in series, and the pre-charging resistor (13) And the pre-charging relay (14) is arranged in parallel with the contactor (12). 7. The high pressure control system according to claim 5, characterized in that, A shunt (15) is arranged on the negative electrode circuit. 8. The high pressure control system according to claim 1, characterized in that, The power converter (51) is selectively connected to the reserved power interface of the grid (40) through a switch (80).

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