CN114362159A - High-voltage box of medium-high voltage direct-hanging energy storage system - Google Patents
High-voltage box of medium-high voltage direct-hanging energy storage system Download PDFInfo
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- CN114362159A CN114362159A CN202210026329.XA CN202210026329A CN114362159A CN 114362159 A CN114362159 A CN 114362159A CN 202210026329 A CN202210026329 A CN 202210026329A CN 114362159 A CN114362159 A CN 114362159A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
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Abstract
The invention provides a high-voltage box of a medium-high voltage direct-hanging energy storage system.A redundant power supply input end receives alternating current power supply and direct current power supply through a corresponding conversion unit respectively; wherein, the conversion unit corresponding to the alternating current power supply adopts an isolation CT; the direct current switch is arranged between the battery and the PCS in the energy storage system; the BCMU is used for controlling the on-off of the direct current switch; the output end of the redundant power supply supplies power to the BCMU and other electrical appliances, and the high-voltage box can be applied to a medium-high voltage direct-hanging energy storage system, and mainly considers power supply isolation; meanwhile, the power supply redundancy reliability of the high-voltage box is designed in a double-power supply mode, one way of the power supply adopts a high-voltage isolation CT to receive alternating current power supply, the other way of the power supply adopts a direct-current battery bus power supply to ensure that the power system is completely de-energized under extreme conditions, and the direct-current power supply bus power supply mode can ensure that the medium-high voltage direct-hanging energy storage system is in black start to drive important loads of the power system and gradually recover the normal operation of the power system.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a high-pressure tank of a medium-high pressure direct-hanging energy storage system.
Background
The medium-high voltage direct-hanging energy storage system has the advantages of large single-machine capacity, high system efficiency, occupied area saving and the like, and generally receives attention in application scenes of new energy power generation, a power supply side, a power grid side and the like. The high-voltage box is an important component of a BMS (Battery Management System), and includes a BCMU (Battery Management Unit), a current divider or hall current detection, a circuit breaker, a contactor, a soft start circuit, and various connection terminals inside.
The high-voltage box communicates with a Power Control System (PCS) and a Battery Management System (BAMS) in a Controller Area Network (CAN) communication manner, so as to manage the Battery, collect the voltage and temperature of each Battery cell, collect the voltage and current of a Battery pack string, and participate in the calculation of State of Charge (SOC), State of Health (State of Battery), direct-current side Power, and the like; meanwhile, the PCS and the BCMU in the high-voltage box keep CAN or 485 communication, important information for the PCS to participate in control is analyzed out to participate in-phase and inter-phase SOC balance control if the SOC of each battery cluster, the BMS uploads main contacts such as PCS alarm signals and PCS protection signals to the PCS or is connected in series with a tripping coil of the high-voltage circuit breaker, when the battery sends out three-level alarm (such as temperature three-level line crossing), the main contacts of the PCS protection signals are closed, the incoming line circuit breaker of the energy storage system is rapidly disconnected, the energy storage system is separated from a power grid, faults are searched, related protection is started, and the safety of the energy storage system is ensured.
The medium-high voltage direct-hanging energy storage system generally operates in a 3 kV-35 kV power system, each current conversion unit is connected with each cluster of battery system in a one-to-one mode, the working ground suspension voltage of the current conversion units and the battery systems is 3 kV-35 kV, and the same is true for the high-voltage box. The high-voltage box of the traditional low-voltage energy storage scheme can not be applied to a medium-high voltage direct-hanging energy storage system, mainly considering power isolation, and meanwhile, the function of the low-voltage energy storage high-voltage box can not meet the requirement of the high-voltage box of the medium-high voltage direct-hanging energy storage system.
Disclosure of Invention
In view of this, the present invention provides a high voltage box of a medium-high voltage direct-hanging energy storage system, which is used for the medium-high voltage direct-hanging energy storage system, and ensures that the medium-high voltage direct-hanging energy storage system is black-started to drive important loads of an electric power system, and gradually resumes normal operation of the electric power system.
The application discloses high-voltage box of medium-high voltage direct-hanging energy storage system includes: the system comprises a direct current switch, a battery management main control unit BCMU and a redundant power supply;
the input end of the redundant power supply receives alternating current power supply and direct current power supply through corresponding conversion units respectively; wherein, the conversion unit corresponding to the alternating current power supply adopts an isolation CT;
the direct current switch is arranged between a battery and the PCS in the energy storage system;
the BCMU is used for controlling the on-off of the direct current switch;
and the output end of the redundant power supply supplies power to the BCMU and other electrical appliances.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the input end of the redundant power supply is connected to an alternating current power supply through an AC/DC conversion unit of a high-voltage isolation CT;
the input end of the redundant power supply is also connected into a high-voltage direct current power supply through a high-voltage isolated DC/DC conversion unit;
and the output end of the redundant power supply is respectively supplied with power by the BCMU, and the core board of the commutation unit of the energy storage system and the BMS.
Optionally, in the high-pressure tank of the medium-high pressure direct-hanging energy storage system, the method further includes: a current detection module;
the current detection module is used for detecting the battery current value of the energy storage system and transmitting the battery current value to the BCMU.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the BCMU is further configured to receive a state fed back by the direct-current switch; and determining a state parameter of the battery according to the battery current value, and controlling the PCS in the energy storage system according to the state parameter.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the communication mode between the BCMU and the energy storage system is 485 and CAN communication.
Optionally, in the high-pressure tank of the medium-high pressure direct-hanging energy storage system, the method further includes: a CAN light conversion module;
the CAN light conversion module is used for converting CAN signals into optical signals.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the CAN light conversion module is powered by the redundant power supply.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the BCMU communicates with the CAN light conversion module;
the CAN light conversion module is communicated with a light conversion CAN module in the energy storage system;
the optical conversion CAN module is communicated with a battery management master control system BAMS in the energy storage system;
the BAMS is in communication with an Energy Management System (EMS) in the energy storage system.
Optionally, in the high-voltage box of the medium-high voltage direct-hanging energy storage system, the CAN light conversion module supplies power by using a first power supply, and the light conversion CAN module and the BAMS supply power by using a second power supply.
Optionally, in the high-pressure tank of the medium-high pressure direct-hanging energy storage system, the method further includes: an incoming and outgoing terminal row;
and the redundant power supply is connected with the outside through the access line terminal block.
According to the technical scheme, the high-pressure tank of the medium-high voltage direct-hanging energy storage system provided by the invention comprises: the system comprises a direct current switch, a battery management main control unit BCMU and a redundant power supply; the input end of the redundant power supply receives alternating current power supply and direct current power supply through corresponding conversion units respectively; wherein, the conversion unit corresponding to the alternating current power supply adopts an isolation CT; the direct current switch is arranged between the battery and the PCS in the energy storage system; the BCMU is used for controlling the on-off of the direct current switch; the output end of the redundant power supply supplies power to the BCMU and other electrical appliances, and the high-voltage box can be applied to a medium-high voltage direct-hanging energy storage system, and mainly considers power supply isolation; meanwhile, the power supply redundancy reliability of the high-voltage box is designed in a double-power supply mode, one way of the power supply adopts a high-voltage isolation CT to receive alternating current power supply, the other way of the power supply adopts a direct-current battery bus power supply to ensure that the power system is completely de-energized under extreme conditions, and the direct-current power supply bus power supply mode can ensure that the medium-high voltage direct-hanging energy storage system is in black start to drive important loads of the power system and gradually recover the normal operation of the power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a high-pressure tank of a medium-high-pressure direct-hanging energy storage system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a redundant power supply in a high-voltage box of a medium-high voltage direct-hanging energy storage system according to an embodiment of the invention;
fig. 3 is a schematic diagram of a communication process in a high-voltage tank of a medium-high voltage direct-hanging energy storage system according to an embodiment of the invention;
fig. 4 is an appearance design of a medium-high voltage direct-hanging energy storage system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a high-voltage box of a medium-high voltage direct-hanging energy storage system, which is used for solving the problem that the high-voltage box of the traditional low-voltage energy storage scheme in the prior art cannot be applied to the medium-high voltage direct-hanging energy storage system, mainly considering power isolation, and simultaneously the function of the low-voltage energy storage high-voltage box cannot meet the requirement of the medium-high voltage direct-hanging energy storage system high-voltage box.
As shown in fig. 1, the high-pressure tank of the medium-high voltage direct-hanging energy storage system comprises: a dc switch (such as the dc breaker/dc contactor shown in fig. 1), a battery management master unit BCMU (such as the two pole master BCMU shown in fig. 1), and a redundant power supply.
The input end of the redundant power supply receives alternating current power supply and direct current power supply through corresponding conversion units (such as power conversion shown in fig. 1) respectively; wherein, the conversion unit corresponding to the alternating current power supply adopts an isolation CT.
Specifically, the input of the redundant power supply receives ac power through a first conversion unit, such as being connected to a power grid, and receives dc power through a second conversion unit, such as a battery dc bus in the energy storage power supply.
The specific connection relationship of the input ends of the redundant power supply is not repeated here, as long as it is ensured that the input ends have alternating current power supply and direct current power supply, and the alternating current power supply adopts isolated CT, which are all within the protection scope of the present application. It should be noted that PT is a voltage transformer. The CT is a current transformer.
The redundant power supply adopts a double-power supply electricity taking mode, one way adopts external alternating current isolation CT electricity taking, the other way adopts direct current bus electricity taking, and a power supply redundant control panel is designed, so that the reliability of the power supply is improved.
The direct current switch is arranged between the battery and the PCS in the energy storage system. Wherein P + is the positive pole of PCS, and P-is the negative pole of PCS; b + is the anode of the battery, and B-is the cathode of the battery.
BCMU is used for controlling the on-off of the DC switch. That is to say, can realize the protection to energy storage system through the break-make of controlling this direct current switch, its specific working process, it is no longer repeated here one by one, it can to decide according to actual conditions, all are in the protection range of this application.
In practical application, the dc switch is a dc breaker or a dc contactor.
That is, the dc switch may be a dc breaker or a dc contactor; of course, the combination of the dc circuit breaker and the dc contactor is not excluded, and the description is omitted here, and the combination is within the protection scope of the present application depending on the actual situation.
Specifically, one path of the redundant power supply adopts a high-voltage isolation CT power taking mode, and 24V is output through AC/DC conversion; the other path of the redundant power supply adopts a high-voltage direct current bus electricity taking mode, and outputs 24V through DC/DC conversion; the two paths of direct current output 24V are smoothly switched through a power supply redundancy control board, namely a redundancy power supply, so that reliable power supply of a load is realized.
The output end of the redundant power supply supplies power for the BCMU and other electrical appliances.
That is to say, under the extreme condition, when the power system loses power completely, can adopt direct current power supply mode can guarantee that medium-high voltage hangs energy storage system black start, drives the important load of power system, resumes power system's normal operating gradually.
It should be noted that the above description is based on the medium-high voltage direct-hanging energy storage system to ground suspension voltage of 3kV to 35kV, that is, the high-voltage box can be applied to the medium-high voltage direct-hanging energy storage system.
In the embodiment, the high-voltage box can be applied to a medium-high voltage direct-hanging energy storage system, and mainly considers power isolation; meanwhile, the power supply redundancy reliability design of the high-voltage box adopts a dual-power supply mode, one way adopts a high-voltage isolation CT to receive alternating current power supply, the other way adopts a direct-current battery bus power supply to supply power, and ensures that all power of the power system is lost (completely black) under extreme conditions.
It should be noted that, in the prior art, the traditional isolation power-taking mode adopts voltage isolation PT, and for an occasion with a relatively low voltage level, such as 3 kV-10 kV, the isolation PT scheme can also meet design requirements in terms of volume and weight. When the voltage level is 20 kV-35 kV, the isolation PT insulating frame is large, the weight is also large, great influence is generated on the improvement of the battery volume ratio of the container energy storage system, the existence of the isolation PT reduces the battery volume ratio of the container energy storage system, and great difficulty is brought to the structural design.
In the embodiment, the dual power supply adopts a redundancy smooth design scheme, and a high-voltage isolation CT power supply mode is adopted to improve the utilization rate and efficiency of the battery capacity under the condition of ensuring the normal operation of the system.
In practical application, as shown in fig. 2, the input terminal of the redundant power supply is connected to the AC power supply through the AC/DC conversion unit of the high-voltage isolation CT.
Specifically, the AC side of the AC/DC conversion unit of the high-voltage isolation CT is connected with an AC power supply; the DC side of the AC/DC conversion unit of the high voltage isolated CT is connected to the input of the redundant power supply.
The input end of the redundant power supply is connected with a high-voltage direct current power supply through a high-voltage isolated DC/DC conversion unit.
Specifically, one side of the high-voltage isolated DC/DC conversion unit is connected to a high-voltage DC power supply, such as a battery DC bus of an energy storage system; the other side of the high-voltage isolated DC/DC conversion unit is connected with the input end of the redundant power supply.
The electric energy of the high-voltage isolated DC/DC conversion unit and the electric energy of the AC/DC conversion unit of the high-voltage isolated CT are converged and then transmitted to the redundant power supply; certainly, the solution that does not converge may also be adopted, and further description is omitted here, which is determined according to actual situations and is within the protection scope of the present application.
The input voltage at the input end of the redundant power supply may be 24V, and may also be other values, which are not described herein again and are all within the protection scope of the present application.
And the output end of the redundant power supply is respectively BCMU, and the core board of the commutation unit of the energy storage system and the BMS supply power.
As shown in fig. 2 and fig. 1, the output end of the redundant power supply outputs 24V voltage for BCMU; meanwhile, the core board of the commutation unit, namely the PCS core board, and the BMS are also supplied with power.
It should be noted that the high voltage tank may also include an electrical operation (e.g., a live operation as shown in fig. 3).
The electric operation is used for completing automatic control through the auxiliary contact, the specific working process is not repeated any more here, and the electric operation is determined according to the actual situation and is within the protection range of the application.
It should be noted that the electrical operation may also be powered by the redundant power supply.
In practical applications, the high-pressure tank further comprises: and a current detection module.
The current detection module is used for detecting the battery current value of the energy storage system and transmitting the battery current value to the BCMU.
Specifically, the current detection module includes: a Hall current sensor and a current module. The hall current sensor collects a battery current value, then transmits the battery current value to the current module, and then the current module transmits the battery current value to the BCMU.
In practical application, the BCMU is further configured to receive a state fed back by the dc switch; and determining the state parameter of the battery according to the current value of the battery, and controlling the PCS in the energy storage system according to the state parameter.
As can be seen from the above description, the BCMU can control the state of the dc switch, so that whether the control of the BCMU is successful can be determined by obtaining the state fed back by the dc switch; if the control failure can be continuous control, even alarm and the like, the details are not repeated here, and the control failure can be determined according to the actual situation and is within the protection scope of the application.
Specifically, the Hall current detection element detects current flowing through each cluster, the BCMU participates in the calculation of data information such as the direct-current side power of the battery cluster, the SOC and the SOH of each cluster of batteries and the like, and then the data information participates in the PCS control.
Meanwhile, if the BCMU finds that the battery core has working conditions of overcharge, overdischarge, temperature crossing and the like, the BCMU sends out a dry junction alarm signal and a protection signal, and the normal signal keeps communication with the PCS through 485 and CAN communication. The dry contact alarm signal and the protection signal CAN also be 485 and CAN communication to communicate with the PCS so as to control the working state of the PCS.
It should be noted that the redundant design of the power supply in the high-voltage box is crucial for reliable power supply of the power supply. The functional design of the high-voltage box is expanded aiming at the characteristics of a medium-high voltage direct-hanging energy storage system, and the normal work of the system on protection, communication and data is met. The structure and the panel design of the high-voltage box are redesigned, and the requirements of the medium-high voltage direct-hanging energy storage system on function expansion and a specific scene structure are met.
In practical application, the BCMU and the energy storage system are communicated in 485 and CAN modes.
Of course, other communication modes are not described in detail here, and all of them are within the protection scope of the present application depending on the actual situation.
In addition, the specific communication process and content of the BCMU and the energy storage system are not repeated here, and may be determined according to actual conditions, all within the protection scope of the present application.
It should be noted that, the battery management system generally adopts a three-level architecture, the primary slave BMU mainly detects the cell voltage and temperature, and uploads the related information to the secondary master BCMU through the CAN bus, and the BCMU is placed in the high-voltage box. Because the secondary master control of the medium-high voltage direct-hanging energy storage system needs to communicate with the tertiary master control BAMS, the whole system runs in a high-voltage environment of 3 kV-35 kV, the secondary master control cannot directly communicate with the tertiary master control BAMS, otherwise, equipment is burnt, and serious short-circuit accidents are caused. Wherein, the primary slave BMU and the tertiary master BAMS are both arranged in the energy storage system.
Based on this, the high-pressure tank may further include: CAN changes optical module.
The CAN light conversion module is used for converting the CAN signal into an optical signal.
The specific conversion process of the CAN light conversion module is not repeated herein, and the details refer to the corresponding prior art and are all within the protection scope of the present application.
In practical application, the CAN light conversion module is powered by a redundant power supply. Certainly, it is not excluded that the CAN light conversion module is powered by other power supplies, and the description is omitted here, and the power supply is within the protection scope of the application depending on the actual situation.
In practical applications, as shown in fig. 3, the BCMU communicates with the CAN light conversion module.
That is to say, the CAN light conversion module receives the CAN signal of the BCMU and converts the CAN signal to obtain an optical signal.
The CAN light conversion module is communicated with a light conversion CAN module in the energy storage system.
That is to say, the light conversion CAN module outputs light signals to the light conversion CAN module in the energy storage system, and the light conversion CAN module is used for converting the light signals into corresponding signals and data.
The optical conversion CAN module is communicated with a battery management master control system BAMS in the energy storage system.
That is, the optical to CAN module transmits corresponding signals and data to the BAMS; the BAMS receives and processes the signal and data.
The BAMS communicates with an Energy Management System (EMS) in the energy storage system.
That is, the BAMS transmits the processed data and signals to the EMS.
Specifically, a PCS alarm function and a PCS protection dry contact function are added to a high-voltage box of the medium-high voltage direct-hanging energy storage system, and communication functions with the PCS, such as 485 communication and CAN communication, and a CAN light conversion signal output high-voltage isolation function are added; the PCS alarm and PCS protection main contact is connected with a secondary main control BCMU output main contact through isolation; the PCS communication function is connected with the 485 output and the CAN output of the secondary master control BCMU through the ARM communication serial communication port and the CAN port by isolation; the input signal of the CAN light conversion module is connected with a CAN communication interface of the secondary master control BCMU, and the CAN light conversion output signal is connected with a CAN receiving signal through an optical fiber.
In the embodiment, the medium-high voltage direct-hanging energy storage system high-voltage box expands corresponding functions such as medium-high voltage cascading PCS alarm signals, protection signals, communication functions, fire protection functions (isolation) and three-level master control CAN communication functions (CAN light conversion isolation) according to the requirements of application scenes, and ensures the safety and reliability of the medium-high voltage direct-hanging energy storage system protection, communication and fire protection systems; a secondary master control (BCMU) and an external tertiary master control (BAMS) in the high-voltage box are designed to completely realize signal isolation by a CAN light conversion isolation technology and different power sources and light isolation, so that safe and reliable transmission of signals is guaranteed, and the safety of equipment is guaranteed.
In practical application, the CAN-to-light module uses a first power supply (e.g., power supply 1 shown in fig. 3) to supply power, and the light-to-CAN module and the BAMS use a second power supply (e.g., power supply 2 shown in fig. 3) to supply power.
It should be noted that the first power supply and the second power supply are different, because the CAN-to-light module and the light-to-CAN module and the BAMS use different power supplies to supply power.
The first power supply may be a power supply provided in the high-voltage tank; the second power supply may be a power supply provided in the energy storage system; of course, other situations are not excluded, and the description is omitted here, and the situations are within the protection scope of the present application.
In practical applications, the high pressure tank may further comprise: and the incoming and outgoing line terminal rows.
The redundant power supply is connected with the outside through the access line terminal block.
The high-voltage box of the medium-high voltage direct-hanging energy storage system increases a high-voltage isolation electricity taking mode, a direct-current bus electricity taking mode and terminal transferring in and out, and increases communication between a BMS and a PCS (battery management system), such as 485 and CAN (controller area network) functions and terminal transferring out; increasing dry contact points between the BMS and the PCS, such as PCS alarm and PCS protection functions and terminal roll-out; and the function of converting light of the high-voltage isolation CAN for communication before the secondary main control BCMU and the tertiary main control BAMS are added.
In this embodiment, the design of power supply isolation and reliability redundancy in the high-voltage box, function extension, communication interface design and high-voltage box overall structure design solve the problem that the high-voltage box of the traditional low-voltage energy storage system can not be directly applied to the medium-high voltage direct-hanging energy storage system at present, and ensure the safety and reliability of communication, protection and control of the medium-high voltage direct-hanging energy storage system.
It should be noted that, the structure and the panel of the high-voltage box are designed according to the requirements of specific application scenarios and structural sizes of the medium-high voltage direct-hanging energy storage system, so as to meet the functions of signal transmission, protection and control. The panel of the high-pressure tank may be designed as shown in fig. 4.
Wherein the interface board 1 may include: interfaces such as a fire power supply (+ -24V), a standby power supply (+ -24V) and the like; the interface board 2 may include: BMS power supply (+ -24V), BMS communication, address inquiry and other interfaces; the interface board 3 may include interfaces such as a CT input power supply; the interface board 4 may include: debugging ports, PCS-CAN communication, PCS-485 communication and other interfaces; the interface board 4 may include: PCS power supply (+ -24V), PCS alarm, PCS protection and other interfaces; the interface board 5 may include: CAN changes optical interface, optic fibre interface etc..
Of course, the setting of each interface is not limited to the above description, and is not repeated here, and all of them are within the protection scope of the present application depending on the actual situation.
Specifically, a high-voltage box panel of the medium-high voltage direct-hanging energy storage system is designed, and a secondary terminal with added functions leads out signals to a front panel through an internal lead, so that the high-voltage direct-hanging energy storage system is conveniently connected with a medium-high voltage cascading PCS power supply, signals, dry contacts and communication; the CAN light conversion high-voltage isolation is connected with the three-level main control BAMS through a panel terminal connecting optical fiber. The wiring convenience is considered in the panel layout, and various electromagnetic interferences are avoided in the signal transmission process.
In this embodiment, for the medium-high voltage direct-hanging energy storage system, the problem of high-level power taking is one of the main reasons that the medium-high voltage direct-hanging energy storage system is difficult to popularize, and mainly adopts a high-voltage power supply isolation PT technology, so that the volume is large, the weight is large, the direct-hanging energy storage system is difficult to push in the medium-high voltage direct-hanging container energy storage system, the volume ratio of a container energy storage system battery system is reduced, and the cost is high. The invention adopts the high-voltage CT isolation electricity-taking technology, reduces the volume and the weight, and simultaneously improves the power supply reliability, adopts an external high-voltage CT isolation power supply and a high-voltage direct-current bus electricity-taking two-path electricity-taking mode, ensures that the power supplies are redundant, and greatly improves the power supply safety and the reliability; the high-voltage box is subjected to function expansion by considering the high potential suspension characteristic of the medium-high voltage direct-hanging energy storage system, the defect that the high-voltage box of the low-voltage energy storage system is not suitable for the medium-high voltage direct-hanging energy storage system is overcome, and a communication function, a dry contact function, a power supply and conversion input function and a power supply and conversion output function are added; the CAN light signal conversion function is added, and the high-voltage system and the low-voltage system are isolated through light signals, so that the safe transmission of the signals is ensured; the medium-high voltage energy storage system structure and the panel are designed, the requirements of specific application scenes and structural layout and wiring are met, and the high-voltage box has the characteristics of attractive and compact appearance design and complete functions.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a high-pressure tank of energy storage system is directly hung to well high pressure which characterized in that includes: the system comprises a direct current switch, a battery management main control unit BCMU and a redundant power supply;
the input end of the redundant power supply receives alternating current power supply and direct current power supply through corresponding conversion units respectively; wherein, the conversion unit corresponding to the alternating current power supply adopts an isolation CT;
the direct current switch is arranged between a battery and an energy storage converter PCS in the energy storage system;
the BCMU is used for controlling the on-off of the direct current switch;
and the output end of the redundant power supply supplies power to the BCMU and other electrical appliances.
2. The high-voltage box of the medium-high voltage direct-hanging energy storage system according to claim 1, wherein the input end of the redundant power supply is connected to an alternating current power supply through an AC/DC conversion unit of a high-voltage isolation CT;
the input end of the redundant power supply is also connected into a high-voltage direct current power supply through a high-voltage isolated DC/DC conversion unit;
and the output end of the redundant power supply is respectively supplied with power by the BCMU, and the core board of the commutation unit of the energy storage system and the BMS.
3. The high-pressure tank of the medium-high voltage direct-hanging energy storage system according to claim 1, further comprising: a current detection module;
the current detection module is used for detecting the battery current value of the energy storage system and transmitting the battery current value to the BCMU.
4. The high-voltage box of a medium-high voltage direct-hanging energy storage system according to claim 3, wherein the BCMU is further configured to receive a state fed back by the DC switch; and determining a state parameter of the battery according to the battery current value, and controlling the PCS in the energy storage system according to the state parameter.
5. The high-voltage box of the medium-high voltage direct-hanging energy storage system according to claim 4, wherein the BCMU and the energy storage system are communicated in a 485 and CAN communication mode.
6. The high-pressure tank of the medium-high voltage direct-hanging energy storage system according to claim 5, further comprising: a CAN light conversion module;
the CAN light conversion module is used for converting CAN signals into optical signals.
7. The high-voltage box of a medium-high voltage direct-hanging energy storage system according to claim 6, wherein the CAN light conversion module is powered by the redundant power supply.
8. The high-voltage box of the medium-high voltage direct-hanging energy storage system according to claim 6, wherein the BCMU communicates with the CAN light conversion module;
the CAN light conversion module is communicated with a light conversion CAN module in the energy storage system;
the optical conversion CAN module is communicated with a battery management master control system BAMS in the energy storage system;
the BAMS is in communication with an Energy Management System (EMS) in the energy storage system.
9. The high-voltage box of a medium-high voltage direct-hanging energy storage system according to claim 8, wherein the CAN light conversion module is powered by a first power supply, and the light conversion CAN module and the BAMS are powered by a second power supply.
10. The high-pressure tank of the medium-high voltage direct-hanging energy storage system according to any one of claims 1 to 9, further comprising: an incoming and outgoing terminal row;
and the redundant power supply is connected with the outside through the access line terminal block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026329.XA CN114362159A (en) | 2022-01-11 | 2022-01-11 | High-voltage box of medium-high voltage direct-hanging energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210026329.XA CN114362159A (en) | 2022-01-11 | 2022-01-11 | High-voltage box of medium-high voltage direct-hanging energy storage system |
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| CN114362159A true CN114362159A (en) | 2022-04-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117856431A (en) * | 2024-03-05 | 2024-04-09 | 四川新能源汽车创新中心有限公司 | Redundant power supply device and power supply method of distributed power supply control system |
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2022
- 2022-01-11 CN CN202210026329.XA patent/CN114362159A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117856431A (en) * | 2024-03-05 | 2024-04-09 | 四川新能源汽车创新中心有限公司 | Redundant power supply device and power supply method of distributed power supply control system |
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