CN215646309U - Large-scale battery energy storage system based on double-scale double control - Google Patents
Large-scale battery energy storage system based on double-scale double control Download PDFInfo
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Abstract
The utility model relates to a large-scale battery energy storage system based on double control of double scales, wherein a battery monomer with millisecond time scale is subjected to exception handling, and a bottom layer monitoring circuit module is used for directly comparing and controlling threshold values; transmitting the real-time monitoring data of a large number of single batteries with second-level time scale to an upper computer management and control system (EMS) through a battery pack string controller, and allocating and controlling power and electric quantity to a battery energy storage unit system in real time by the EMS; the millisecond time scale of the monitoring response of the battery monomer layer and the second time scale of the charging and discharging power and electric quantity regulation response of the battery energy storage unit system are respectively processed, so that the charging and discharging regulation can be effectively carried out, the short plate effect generated by the battery monomer can be timely monitored, the rhythm of large-quantity data transmission is reasonably arranged, the data transmission quality and stability are improved, the transmission level of data is effectively reduced, and the flat direct control architecture and safe, efficient and stable operation of the large-scale battery energy storage system are realized.
Description
Technical Field
The utility model belongs to the technical field of battery energy storage, and particularly relates to a double-scale double-control large-scale battery energy storage system.
Background
The wide application and large-scale grid-connected operation of new energy needs more power regulation capacity of a power grid, and a novel power system mainly based on the new energy needs energy storage as a regulation means. Therefore, energy storage develops rapidly, and particularly, a battery energy storage system with short construction period and quick effect is widely applied and has larger and larger scale. Because the capacity and the voltage level of the battery monomer are very low, a large-scale battery energy storage system needs a large number of battery monomers to be connected in series to form a group and connected in parallel to a direct current bus to be converted into alternating current through a converter and connected to a power grid. Due to the characteristic that the inherent shortage of the battery is easy to generate inconsistency, the inconsistency of a large number of battery monomers when forming a battery energy storage unit system causes a short plate effect, the operation efficiency of the whole energy storage system is influenced, and even safety accidents are caused; therefore, a large number of battery cells need to be monitored, responded to and processed in time.
It is known from a lot of practices that one of the key points of the safe operation of the battery energy storage system is to monitor the battery generating the short plate effect and adjust the charging and discharging power and the electric quantity of the whole battery energy storage system according to the operation state and the real-time parameters of the battery. Therefore, two aspects of monitoring management are needed in the battery storage system, one is the monitoring management of a battery monomer level, and the changes of voltage, temperature and electric quantity parameters of the battery in the battery pack string during operation are screened in real time; and the other aspect is to manage and control a plurality of battery energy storage unit systems forming the large-scale battery energy storage system, so that the management and control of the power and electric quantity demand response of the battery energy storage system on the whole charging and discharging of the power grid are met.
The battery energy storage system generates inconsistency in the operation process, the charging and discharging range is reduced due to the short plate effect of the battery, the energy management and control system operates in an allowable range, the charging and discharging power and the electric quantity of each battery energy storage unit system are adjusted, the single battery condition of the short plate effect is regulated and controlled no matter the single battery layer or the single battery energy storage unit system layer, and therefore the whole energy management and control of the battery energy storage system are required to be implemented on the basis of monitoring and controlling the single short plate battery in time. It can be known from a large amount of researches and corresponding standards of battery energy storage system schemes and designs that the prior art adopts a data processing and control mode of one second time scale, and the actual conditions of battery monomer abnormity and malignant faults occurring in hundred millisecond time scale cannot be controlled and processed in time; the time scale of the battery damage caused by the inconsistency of the battery monomers and even the occurrence of malignant accidents is in the order of hundred milliseconds; the response of the energy storage charge and discharge power and the electric quantity regulation is on a time scale of a second level or a minute level. Two different time scales exist in response time of the management and control of the battery monomer and the battery energy storage system, so that the requirements of the architecture of the battery energy storage system and the control response and processing modes of two layers are different; on two control layers of a battery monomer and a battery energy storage unit system, different time scales of monitoring response are preferably adopted, the control of the battery energy storage system is to respectively process the time scale of the monitoring response of the battery monomer and the time scale of the charging and discharging power and electric quantity regulation response of the battery energy storage unit system, so that the charging and discharging regulation can be safely and effectively carried out, the short plate effect generated by the battery monomer can be monitored in time, meanwhile, the frequency of data quantity transmission is reduced, the data transmission and processing can be more flexibly arranged, the transmission quality and stability of real-time monitoring data are improved, the integrity of effective data and the timeliness of control processing are ensured, and the whole battery energy storage system, particularly a large-scale battery energy storage system, realizes a flat direct control framework and safe, efficient and stable operation.
Disclosure of Invention
In order to solve the problems that a large-scale battery energy storage system can rapidly respond to real-time parameters of a large number of battery monomers and effectively process overall data, rapid protection control is carried out when the response battery monomers are abnormal in a millisecond-level time scale, the battery monomer real-time parameter data are completely and comprehensively provided for an Energy Management System (EMS) of an upper computer in a second-level time scale, and reasonable allocation and healthy operation of the battery energy storage system are supported. The utility model provides a large-scale battery energy storage system based on double-scale and double-control, which mainly comprises: the system comprises a bidirectional energy storage inverter PCS, an upper computer EMS control communication path, an EMS energy management and control system, a PCS direct current bus, a battery parameter sampling monitoring circuit module, a battery PACK string data processing and monitoring circuit module, an electric control direct current contactor of a battery PACK string, a battery PACK string switch control line, a battery parameter sampling wire harness, a battery PACK string current sampling circuit, a battery module PACK, a battery PACK string monitoring communication line, an electric control circuit of a PACK string switch, a battery PACK string and a battery PACK string fuse; the method is characterized in that aiming at two time scales of millisecond and second, a bottom layer and an upper layer are adopted to be independent, namely: the bottom layer is that a battery parameter sampling monitoring circuit module is connected with each battery monomer in a battery module PACK through a battery parameter sampling wire harness to form a real-time control unit system for monitoring and safety protection of the battery monomers, and is connected with an electric control direct current contactor of a battery PACK string through an electric control circuit of a PACK string switch to form a battery layer operation protection monitoring path with millisecond time scale; the upper layer is that the EMS energy management and control system is respectively connected with the battery pack string data processing and monitoring circuit module and the bidirectional energy storage inverter PCS through an upper computer EMS control communication path to form a large-scale battery energy storage system charge and discharge control framework, and the bidirectional energy storage inverter PCS is directly subjected to second-level time scale power and electric quantity regulation and control according to the whole parameters of the battery monomer and the battery pack string.
The large-scale battery energy storage system based on double-scale double control is characterized in that a plurality of battery modules PACK are connected in series to form a battery PACK string, two ends of the battery PACK string are respectively connected into a PCS direct current bus through an electric control direct current contactor of the battery PACK string and a fuse of the battery PACK string, and form a battery energy storage unit and a charging and discharging path together with a bidirectional energy storage inverter PCS, wherein the number of the battery modules PACK is more than or equal to 2, and the voltage range of the bidirectional energy storage inverter PCS direct current side charging and discharging is met.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a plurality of battery parameter sampling monitoring circuit modules are respectively connected with each corresponding battery monomer in a plurality of battery modules PACK through battery parameter sampling wire harnesses to form a parameter sampling circuit and an information path for monitoring all the battery monomers, wherein the number of the battery monomers in the battery modules PACK is more than or equal to 4, and each battery monomer is connected with the positive electrode and the negative electrode of the adjacent battery monomer in series.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a battery pack string data processing and monitoring circuit module is respectively connected with a plurality of battery parameter sampling and monitoring circuit modules through battery pack string monitoring communication lines to form an information path for collecting and processing battery parameters of battery cells of a battery pack string and monitoring the battery cells in real time.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a plurality of battery parameter sampling monitoring circuit modules are respectively connected with an electric control direct current contactor of a battery pack string through an electric control circuit of a pack string switch to form a millisecond control driving path for on-off of a charging and discharging power path of the battery pack string.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a battery pack string data processing and monitoring circuit module is connected with an electric control direct current contactor of a battery pack string through a battery pack string switch control line to form a control path for interrupting operation when a battery monomer and the battery pack string are abnormal.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a battery pack string data processing and monitoring circuit module samples current parameters of a battery pack string in real time through a battery pack string current sampling circuit to obtain a battery charge state based on ampere-hour.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that an EMS energy management and control system is connected with a battery pack string data processing and monitoring circuit module through an upper computer EMS control communication path, the battery pack string data processing and monitoring circuit module is connected with at least one battery pack string, the on-off of the electric control direct current contactor of the battery pack string is controlled by the battery pack string data processing and monitoring circuit module to form the electric quantity adjustment of the battery pack string and the maintenance and protection control of the battery pack string, when charging, the battery pack string reaching the upper limit of the electric quantity and the battery monomer disconnect the electric control direct current contactor of the corresponding battery pack string to avoid overcharging, when charging, the battery pack string reaching the lower limit of the electric quantity and the battery monomer disconnect the electric control direct current contactor of the corresponding battery pack string to avoid over-discharge, and meanwhile, the electric quantity balance of the battery pack cascade is completed, the short plate effect is reduced, and the overall efficiency of the battery energy storage unit system is improved.
The utility model relates to a large-scale battery energy storage system based on double-scale and double-control, which aims at timely control of the large-scale battery energy storage system needing quick response to battery monomer abnormity and transmission processing and control of a host computer management and control system on real-time sampling data of a large number of batteries, adopts millisecond-scale time scale battery monomer abnormity processing, and directly carries out threshold comparison and control by a bottom monitoring circuit module; transmitting the real-time monitoring data of a large number of single batteries on a second-level time scale to an upper computer management and control system (EMS) through a battery string data processing and monitoring circuit module serving as a battery string controller, and allocating and controlling power and electric quantity to a battery energy storage unit system in real time by an EMS energy management and control system; through preferably adopting different monitoring time scales, the millisecond-level time scale of the monitoring response of the battery monomer layer and the second-level time scale of the charging and discharging power and electric quantity regulation and control response of the battery energy storage unit system are respectively processed, so that the charging and discharging regulation and control can be effectively carried out, and the short plate effect generated by the battery monomer can be timely monitored, the rhythm of large-quantity data transmission is reasonably arranged, the data transmission quality and stability are improved, information is directly interacted by the EMS energy management and control system and the battery pack string data processing and monitoring circuit module, a BMS main control device is omitted, the investment is saved, the transmission level of data is effectively reduced, and the flat direct control architecture and the safety, the high efficiency and the stable operation of the large-scale battery energy storage system are realized.
Drawings
Fig. 1 is a schematic diagram of a typical battery energy storage unit system in the prior art, which mainly includes: host computer EMS controls communication path (1), EMS energy management and control system (2), PCS direct current bus (3), battery parameter sampling monitoring circuit module (4), battery group string data processing and monitoring circuit module (5), electric control direct current contactor (6) of battery group string, battery group string switch control line (7), battery parameter sampling pencil (8), battery group string current sampling circuit (9), battery module PACK (10), battery group string monitoring communication line (11), BMS battery group string communication line (12), battery group string (13), battery group string fuse (14), BMS master control set (15).
Fig. 2 is a schematic diagram of a dual-scale dual-control battery energy storage unit system according to the present invention, which mainly includes: bidirectional energy storage inverter PCS (0), upper computer EMS control communication path (1), EMS energy management and control system (2), PCS direct current bus (3), battery parameter sampling monitoring circuit module (4), battery PACK string data processing and monitoring circuit module (5), electric control direct current contactor (6) of battery PACK string, battery PACK string switch control line (7), battery parameter sampling wire harness (8), battery PACK string current sampling circuit (9), battery module PACK (10), battery PACK string monitoring communication line (11), electric control circuit (12) of PACK string switch, battery PACK string (13) and battery PACK string fuse (14).
Fig. 3 is a large-scale battery energy storage system based on dual control of dual scales, which mainly comprises: bidirectional energy storage inverter PCS (0), upper computer EMS control communication path (1), EMS energy management and control system (2), PCS direct current bus (3), battery parameter sampling monitoring circuit module (4), battery PACK string data processing and monitoring circuit module (5), electric control direct current contactor (6) of battery PACK string, battery PACK string switch control line (7), battery parameter sampling wire harness (8), battery PACK string current sampling circuit (9), battery module PACK (10), battery PACK string monitoring communication line (11), electric control circuit (12) of PACK string switch, battery PACK string (13) and battery PACK string fuse (14).
Detailed Description
A large-scale battery energy storage system based on dual-scale dual control is described as an implementation example, with reference to the accompanying drawings, however, the described embodiment is a part of the embodiment, but not all, of the embodiment in which the present invention is applied to a large-scale battery energy storage system based on dual-scale dual control. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The techniques and schemes of the present invention are not limited to those given in this example.
As shown in fig. 1, a typical battery energy storage unit system in the prior art adopts an EMS energy management and control system (2) to collect and process battery cell real-time operation parameters and perform processing control through a BMS master control device (15) of three levels, a battery string data processing and monitoring circuit module (5) and a battery parameter sampling and monitoring circuit module (4) as a battery string controller, and a three-layer frame in the prior art is constructed such that the success rate and stability of collection and processing of mass battery cell real-time data of a large-scale battery energy storage system are reduced, particularly, for the abnormal fault of a hundred millisecond battery monomer, two levels of transmission and processing of a battery pack string data processing and monitoring circuit module (5) and a battery parameter sampling and monitoring circuit module (4) are required, so that the timeliness of processing control is influenced, and the damage of the battery monomer and even the malignant accident of explosion are easily caused. Because the prior art adopts a response processing framework at least comprising two levels of a battery pack string data processing and monitoring circuit module (5) and a battery parameter sampling monitoring circuit module (4) to monitor the single battery layer, the data processing and control of a second-level time scale are needed, and in the face of the actual situation that the single battery is abnormal and has a malignant fault, the time scale is hundreds of milliseconds, the prior art cannot meet the requirement of timely processing and controlling response, so that the risk that a large-scale battery energy storage system is easy to generate battery damage and even malignant accidents is caused.
As shown in figure 2, a dual-scale dual-control battery energy storage unit system overcomes the defects of the battery energy storage unit system typical in the prior art, adopts an EMS energy management and control system (2) to directly interact information with a battery string data processing and monitoring circuit module (5) serving as a battery string controller, reduces the hierarchical links of real-time data transmission and processing, simultaneously adopts an electrical control circuit (12) added with a string switch, directly carries out threshold comparison and control by a battery parameter sampling and monitoring circuit module (4), realizes the exception handling and control of battery monomers with millisecond time scale, realizes the real-time monitoring and rapid control of the battery level by the battery parameter sampling and monitoring circuit module (4), and simultaneously realizes the real-time data processing of mass batteries and the real-time allocation control of the battery string and the battery energy storage unit system level by the EMS energy management and control system (2), the processing frequency of response and control is respectively operated in a millisecond time scale and a second time scale; can effectively carry out the control of charging and discharging and realize the short plate effect that in time monitoring battery monomer produced again, prevent that the free malignant accident of battery from taking place, when effectively reducing the transmission level of data, realized the transmission processing frequency of rational arrangement mass data, ensure that effective data obtains stable transmission and in time accomplishes the real-time operation parameter of collection battery monomer and handles and quick response and control, effectively reduce and avoid large-scale battery energy storage system to take place the risk that the battery harmd even takes place malignant accident.
As shown in fig. 3, a large-scale battery energy storage system based on dual control of dual scales mainly includes: the system comprises a bidirectional energy storage inverter PCS (0), an upper computer EMS control communication path (1), an EMS energy management and control system (2), a PCS direct current bus (3), a battery parameter sampling monitoring circuit module (4), a battery PACK string data processing and monitoring circuit module (5), an electric control direct current contactor (6) of a battery PACK string, a battery PACK string switch control line (7), a battery parameter sampling wire harness (8), a battery PACK string current sampling circuit (9), a battery module PACK (10), a battery PACK string monitoring communication line (11), an electric control circuit (12) of a PACK string switch, a battery PACK string (13) and a battery PACK string fuse (14); the method is characterized in that aiming at two time scales of millisecond and second, a bottom layer and an upper layer are adopted to be independent, namely: the bottom layer is a battery parameter sampling monitoring circuit module (4) serving as a battery single transistor controller, which is connected with each battery single in a battery module PACK (10) through a battery parameter sampling wiring harness (8) to form a battery single monitoring and safety real-time control unit, and is connected with an electric control direct current contactor (6) of a battery PACK string through an electric control circuit (12) of a PACK string switch to form a battery energy storage operation protection monitoring path with millisecond-level time scale; the upper layer is that an EMS energy management and control system (2) is respectively connected with a battery pack string data processing and monitoring circuit module (5) and a bidirectional energy storage inverter PCS (0) which are used as a battery pack string controller through an upper computer EMS control communication path (1) to form a large-scale battery energy storage system charge and discharge control unit, so that the battery energy storage overall parameters are processed in real time and the power and the electric quantity of the second-level time scale are regulated and controlled.
The large-scale battery energy storage system based on double control of double scales is characterized in that a plurality of battery modules PACK (10) are connected in series to form a battery PACK string (13), two ends of the battery PACK string (13) are respectively connected into a PCS direct current bus (3) through an electric control direct current contactor (6) of a battery fine string and a battery PACK string fuse (14) and form a battery energy storage unit and a charging and discharging path together with a bidirectional energy storage inverter PCS (0), wherein the number of the battery modules PACK (10) is more than or equal to 2, and the voltage range of charging and discharging of the direct current side of the bidirectional energy storage inverter PCS (0) is met.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a plurality of battery parameter sampling monitoring circuit modules (4) are respectively connected with each battery monomer in a plurality of battery modules PACK (10) through battery parameter sampling wiring harnesses (8) to form a parameter sampling circuit and an information path for monitoring all the battery monomers, wherein the number of the battery monomers in the battery modules PACK (10) is more than or equal to 4, and each battery monomer is connected with the positive electrode and the negative electrode of the adjacent battery monomer in series.
The large-scale battery energy storage system based on double control of double scales is characterized in that a battery pack string data processing and monitoring circuit module (5) is respectively connected with a plurality of battery parameter sampling and monitoring circuit modules (4) through battery pack string monitoring communication lines (11) to form an information path for collecting and processing battery parameters of each battery monomer of the battery pack string and monitoring each battery monomer in the battery pack string in real time.
The large-scale battery energy storage system based on double control of double scales is characterized in that a plurality of battery parameter sampling monitoring circuit modules (4) are respectively connected with an electric control direct current contactor (6) of a battery pack string through an electric control circuit (12) of a pack string switch to form a millisecond control driving path for on-off of a charging and discharging power path of the battery pack string.
The large-scale battery energy storage system based on double control of double scales is characterized in that a battery pack string data processing and monitoring circuit module (5) is connected with an electric control direct current contactor (6) of a battery pack string through a battery pack string switch control line (7) to form a control path for interrupting operation when a battery monomer and the battery pack string are abnormal.
The large-scale battery energy storage system based on double-scale and double-control is characterized in that a battery pack string data processing and monitoring circuit module (5) samples current parameters of a battery pack string (13) in real time through a battery pack string current sampling circuit (9) to obtain a battery charge state based on ampere-hour.
The large-scale battery energy storage system based on double-scale double control is characterized in that an EMS energy management and control system (2) is connected with a battery pack string data processing and monitoring circuit module (5) through an upper computer EMS control communication path (1), the battery pack string data processing and monitoring circuit module (5) is connected with at least one battery pack string (13), and the battery pack string data processing and monitoring circuit module (5) is used for controlling the on-off of an electric control direct current contactor (6) of the battery pack string to form the electric quantity regulation of the battery pack string (13) and the maintenance and protection control of the battery pack string (13), the battery pack string (13) reaching the upper limit of the electric quantity and a battery monomer are disconnected with the electric control direct current contactor (6) of the corresponding battery pack string to avoid overcharging during charging, the battery pack string (13) reaching the lower limit of the electric quantity and the battery monomer are disconnected with the electric control direct current contactor (6) of the corresponding battery pack string to avoid overdischarging during charging, and meanwhile, the electric quantity balance of the battery pack cascade is completed, the short plate effect is reduced, and the overall efficiency of the battery energy storage unit system is improved.
The utility model relates to a large-scale battery energy storage system based on double-scale and double-control, which aims at timely control of the large-scale battery energy storage system needing quick response to battery monomer abnormity and transmission processing and control of a host computer management and control system on real-time sampling data of a large number of batteries, and adopts a mode that millisecond-level time scale battery monomer abnormity processing is directly carried out threshold value comparison and control on a bottom layer monitoring circuit module; transmitting the real-time monitoring data of a large number of single batteries with second-level time scale to an upper computer management and control system through a battery pack string controller, supporting an EMS (energy management system) to reasonably allocate power and electric quantity to a large-scale battery energy storage system in real time, and controlling the large-scale battery energy storage system to operate healthily and efficiently; the optimal battery parameter sampling monitoring circuit module (4) carries out real-time monitoring and control on the battery level, and the EMS energy management and control system (2) carries out real-time allocation control on the battery pack string and battery energy storage unit system level, and respectively operates on the processing frequency of millisecond time scale and second time scale response and management and control; by adopting different monitoring time scales, the time scale of the monitoring response of the single battery and the time scale of the charging and discharging power and electric quantity regulation response of the battery energy storage unit system are respectively processed, so that the charging and discharging regulation can be effectively carried out, the short plate effect generated by the single battery can be timely monitored, the occurrence of serious accidents of the single battery can be prevented, the transmission frequency of a large amount of data can be reasonably arranged, the transmission level of the data can be effectively reduced, the stable transmission and the timely processing of effective data can be ensured, the whole battery energy storage system, especially the large-scale battery energy storage system can realize direct control and personalized regulation, and the safe, efficient and healthy operation of the large-scale battery energy storage system can be ensured.
The utility model provides a large-scale battery energy storage system component based on double-scale double control, an organization relation, an architecture and a control method, however, the battery energy storage unit system, a battery pack cluster and the internal components thereof are not limited to the corresponding components described, for example, an electric control direct current contactor can select other electric control switches with the same function, and the basic conception lies in the technical scheme and the system architecture and the overall system effect realized by the connection relation of the functional components.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various modifications, combinations, formulas and parameters can be designed according to the technical scheme of the utility model without creative efforts, and changes, modifications, substitutions and variations of the embodiments can be made without departing from the principle and conceptual framework of the utility model and still fall into the protection scope of the utility model.
Claims (8)
1. A large-scale battery energy storage system based on double control of double scales mainly comprises: the system comprises a bidirectional energy storage inverter PCS, an upper computer EMS control communication path, an EMS energy management and control system, a PCS direct current bus, a battery parameter sampling monitoring circuit module, a battery PACK string data processing and monitoring circuit module, an electric control direct current contactor of a battery PACK string, a battery PACK string switch control line, a battery parameter sampling wire harness, a battery PACK string current sampling circuit, a battery module PACK, a battery PACK string monitoring communication line, an electric control circuit of a PACK string switch, a battery PACK string and a battery PACK string fuse; the method is characterized in that aiming at two time scales of millisecond and second, a bottom layer and an upper layer are adopted to be independent, namely: the bottom layer is that a battery parameter sampling monitoring circuit module is connected with each battery monomer in a battery module PACK through a battery parameter sampling wire harness to form a real-time control unit system for monitoring and safety protection of the battery monomers, and is connected with an electric control direct current contactor of a battery PACK string through an electric control circuit of a PACK string switch to form a battery layer operation protection monitoring path with millisecond time scale; the upper layer is that the EMS energy management and control system is respectively connected with the battery pack string data processing and monitoring circuit module and the bidirectional energy storage inverter PCS through an upper computer EMS control communication path to form a large-scale battery energy storage system charge and discharge control framework, and the power and the electric quantity of the second-level time scale are regulated and controlled according to the whole parameters of the battery monomer and the battery pack string.
2. The large-scale battery energy storage system based on double-scale and double-control as claimed in claim 1, wherein a plurality of battery modules PACKs are connected in series to form a battery string, two ends of the battery string are respectively connected to a PCS direct current bus through an electric control direct current contactor and a fuse of the battery string, and form a battery energy storage unit and a charge and discharge path together with a bidirectional energy storage inverter PCS, wherein the number of the battery modules PACKs is more than or equal to 2, and the voltage range of the bidirectional energy storage inverter PCS direct current side charge and discharge is satisfied.
3. The large-scale battery energy storage system based on dual-scale and dual-control as claimed in claim 1, wherein the multiple battery parameter sampling monitoring circuit modules are respectively connected with each corresponding battery cell in the multiple battery modules PACK through a battery parameter sampling wire harness to form a parameter sampling circuit and an information path for monitoring all the battery cells, wherein the number of the battery cells in the battery modules PACK is greater than or equal to 4, and each battery cell is connected with the positive and negative electrodes of the adjacent battery cell in series.
4. The system of claim 1, wherein the battery string data processing and monitoring circuit module is connected to the plurality of battery parameter sampling and monitoring circuit modules through the battery string monitoring communication lines, so as to form an information path for collecting and processing battery parameters of the battery string and real-time monitoring of each battery cell of the battery string.
5. The large-scale battery energy storage system based on double-scale and double-control of claim 1, wherein the battery parameter sampling monitoring circuit modules are respectively connected with an electric control direct current contactor of a battery pack string through an electric control circuit of a pack string switch to form a millisecond control driving path for on-off of a charging and discharging power path of the battery pack string.
6. The large-scale battery energy storage system based on double-scale and double-control of claim 1, wherein the battery pack string data processing and monitoring circuit module is connected with an electric control direct current contactor of the battery pack string through a battery pack string switch control line to form a control path for interrupting operation when the battery single cells and the battery pack string are abnormal.
7. The system of claim 1, wherein the battery string data processing and monitoring circuit module samples the battery string current parameters in real time through the battery string current sampling circuit to obtain the ampere-hour based battery state of charge.
8. The large-scale battery energy storage system based on dual-scale dual control as claimed in claim 1, wherein the EMS energy management and control system is connected with the battery string data processing and monitoring circuit module through the upper-computer EMS control communication path, at least one battery string is connected with the battery string data processing and monitoring circuit module, and the on-off of the electrically-controlled DC contactor of the battery string is controlled through the battery string data processing and monitoring circuit module, so as to form the electric quantity regulation of the battery string and the maintenance and protection control of the battery string, the battery string and the battery cell which reach the upper limit of the electric quantity first during charging disconnect the electrically-controlled DC contactor of the corresponding battery string to avoid over-charging, the battery string and the battery cell which reach the lower limit of the electric quantity first during charging disconnect the electrically-controlled DC contactor of the corresponding battery string to avoid over-discharging, and simultaneously complete the electric quantity equalization of the battery string stage, the short plate effect is reduced, and the overall efficiency of the battery energy storage unit system is improved.
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