CN212162825U - Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system - Google Patents
Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system Download PDFInfo
- Publication number
- CN212162825U CN212162825U CN202020974322.7U CN202020974322U CN212162825U CN 212162825 U CN212162825 U CN 212162825U CN 202020974322 U CN202020974322 U CN 202020974322U CN 212162825 U CN212162825 U CN 212162825U
- Authority
- CN
- China
- Prior art keywords
- unit
- flexible
- battery module
- bms
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- 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
-
- 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
- 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
- Y02E60/10—Energy storage using batteries
-
- 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
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
-
- 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
- Y04S10/14—Energy storage units
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment, including isolation transformer, flexible the control unit, a plurality of BMS unit, a plurality of AC/DC unit, a plurality of battery module and backend server, wherein: a plurality of the battery module sets up that connects in parallel each other, just the battery module with the BMS unit reaches the mutual series connection setting of AC/DC unit, the BMS unit the AC/DC unit reaches the battery module one-to-one sets up, just the BMS unit with the mutual series connection setting of AC/DC unit, the utility model discloses standardized structure, control is simple, and is with low costs, can compatible different types of battery module use in groups simultaneously, has realized the flexible power control strategy at the battery of different specification AC/DC unit and different specification capacities, can adjust through flexible control unit and carry out flexible charge-discharge according to flexible charge-discharge power distribution result to the battery module, realizes balanced control function.
Description
Technical Field
The utility model belongs to the technical field of the energy storage, concretely relates to based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment.
Background
With the continuous improvement of the economy of the energy storage technology, the role of energy storage in renewable energy power generation, smart power grids and energy internet construction is increasingly prominent, and China also has a policy in succession to encourage the construction and application of the energy storage technology. According to different access modes and application scenes, the application of the energy storage system mainly comprises a centralized mode and a distributed mode. The energy storage system for centralized application is generally accessed in the same grid-connected point in a centralized way, at present, the form is mainly adopted in the aspects of large-scale renewable energy power generation grid connection, power grid auxiliary service and the like, and the energy storage system has the characteristics of large power (several megawatts to hundreds of megawatts), long discharge duration (minutes to hours) and the like. The distributed energy storage system is flexible in access position and is mainly applied to medium and low voltage power distribution networks, distributed power generation and micro-grids and user sides at present. The scale of the power and capacity of the distributed energy storage is relatively small.
The distributed energy storage system has the advantages of wide application range, and has several characteristics:
1. the energy storage medium is diversified, such as lithium iron phosphate, ternary, lead-acid, sodium-sulfur batteries, flow batteries, super capacitors and the like, the voltage platforms of the batteries are different, and the same battery has different capacities;
2. distributed energy storage is mostly in a modular design and is managed by multiple branches, and the control in different energy storage media is relatively complex;
3. there are typically multiple distributed energy storage systems and multiple branch situations in a single energy storage system.
In view of the above three situations, a distributed energy storage control system is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a based on the flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment to solve foretell technical problem.
In order to achieve the above object, the utility model provides a following technical scheme: based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment, including isolation transformer, flexible control unit, a plurality of BMS unit, a plurality of AC/DC unit, a plurality of battery module and backend server, wherein:
the battery modules are arranged in parallel, and the battery modules, the BMS unit and the AC/DC unit are arranged in series;
the BMS units, the AC/DC units and the battery modules are arranged in a one-to-one correspondence manner, and the BMS units and the AC/DC units are mutually connected in series;
the BMS unit and the AC/DC unit are electrically connected with the flexible control unit, and the flexible control unit can be communicated with the background server through wires and/or wirelessly;
the flexible control unit is connected with the isolation transformer through a cable, the flexible control unit is connected to an external power grid through the isolation transformer, and the isolation transformer can isolate and match voltage;
the BMS unit is used for acquiring state information of the corresponding battery module, and the AC/DC unit switches charging/discharging of the battery module;
the flexible control unit can collect the battery module state information and the AC/DC unit state information collected by the BMS unit and transmit the battery module state information and the AC/DC unit state information to the background server;
the background server carries out flexible charging and discharging power distribution on the battery module according to the transmission information of the flexible control unit, the background server can send flexible charging and discharging power distribution results to the flexible control unit in a wired and/or wireless mode, and the flexible control unit carries out flexible charging and discharging on the battery module according to the flexible charging and discharging power distribution results.
Preferably, a bus type network topology structure is adopted among the flexible control unit, the BMS unit and the AC/DC unit, and the bus type network topology structure comprises RS232, RS485, CAN and Devicenet.
Preferably, the state information of the battery module collected by the BMS unit includes an absolute value of a capacity of the battery, an open-circuit voltage value of the battery, an internal resistance value of the battery, and a self-discharge value of the battery.
Preferably, the AC/DC unit status information collected by the BMS unit includes a rated power of the AC/DC unit, a current-time power of the AC/DC unit, a remaining discharging power of an nth AC/DC unit, a remaining charging power of an nth AC/DC unit, a charging power allowed by the nth AC/DC unit, and a discharging power allowed by the nth AC/DC unit.
Preferably, the specification capacities of the plurality of battery modules are different from each other, and the specifications of the plurality of AC/DC units are different from each other.
Preferably, a CPU capable of processing information transmitted by the flexible control unit is arranged in the background server, and the CPU is TMS320F 2812.
The utility model discloses a technological effect and advantage: the distributed energy storage system multi-parameter dynamic adjustment flexible charge and discharge control system is of a standardized structure, simple to control and low in cost, can be compatible with different types of battery modules to be used in groups, achieves flexible power control strategies of batteries with different specifications of AC/DC units and different specifications of capacity, can adjust the flexible charge and discharge of the battery modules according to flexible charge and discharge power distribution results through the flexible control unit, and achieves a balance control function.
Drawings
Fig. 1 is a circuit topology diagram of the present invention.
In the figure: 1-isolation transformer, 2-flexible control unit, 3-BMS unit, 4-AC/DC unit, 5-battery module and 6-background server.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment as shown in figure 1, including isolation transformer 1, flexible the control unit 2, a plurality of BMS unit 3, a plurality of AC/DC unit 4, a plurality of battery module 5 and backend server 6, wherein:
the battery modules 5 are arranged in parallel, when the battery modules 5 of the high-voltage direct-current system are charged, each battery module 5 connected in series is charged, the charging voltage of some battery modules 5 is higher than that of other battery modules 5 due to the fact that the performances of the battery modules 5 are slightly different, the battery modules 5 are aged in advance, as long as the performances of one battery module 5 connected in series are reduced, the performances of all the battery modules 5 are reduced, tests prove that the service life of the battery is related to the number of the battery modules 5 connected in series, and the higher the voltage of the battery module 5 is, the faster the battery module 5 is aged.
The battery module 5, the BMS unit 3 and the AC/DC unit 4 are connected in series, the BMS unit 3 adopts a passive equalization technology, and can simultaneously perform discharge equalization on the corresponding battery module 5, so that the consistency of the battery is improved, and the service life of the battery is prolonged.
When the battery module 5 has one or more faults, for example, the temperature of the battery module 5 is too high or too low, the battery module 5 is over-voltage or under-voltage, the battery module 5 is over-current or under-voltage, and the battery module 5 is over-current or short-circuit in charging/discharging, the BMS unit 3 can cut off the battery module 5 with the faults, so that the battery module 5 can be effectively protected, and the power utilization safety is improved.
The AC/DC unit 4 can convert the AC power input by the external power grid into DC power and output the DC power to the battery module 5 or convert the DC power output by the battery module 5 into AC power and output the AC power to the external power grid according to the scheduling instruction issued by the flexible control unit 2.
The BMS units 3, the AC/DC units 4, and the battery modules 5 are disposed in one-to-one correspondence, and the BMS units 3 and the AC/DC units 4 are disposed in series with each other;
the BMS unit 3 and the AC/DC unit 4 are electrically connected to the flexible control unit 2, and the flexible control unit 2 can communicate with the background server 6 by wire and/or wirelessly;
the flexible control unit 2 is connected with the isolation transformer 1 through a cable, the flexible control unit 2 is connected to an external power grid through the isolation transformer 1, and the isolation transformer 1 can isolate and match voltage;
the BMS unit 3 is used to collect state information of the corresponding battery module 5, and the AC/DC unit 4 switches charging/discharging of the battery module 5;
the flexible control unit 2 can collect the state information of the battery module 5 and the state information of the AC/DC unit 4 collected by the BMS unit 3 and transmit the state information to the background server 6;
the background server 6 distributes the flexible charging and discharging power of the battery module 5 according to the information transmitted by the flexible control unit 2, the background server 6 can send the flexible charging and discharging power distribution result to the flexible control unit 2 in a wired and/or wireless mode, and the flexible control unit 2 flexibly charges and discharges the battery module 5 according to the flexible charging and discharging power distribution result.
Specifically, a bus type network topology structure is adopted among the flexible control unit 2, the BMS unit 3 and the AC/DC unit 4, and real-time and non-real-time data are separately transmitted, so that communication of the upper-level control BMS unit 3 of the flexible control unit 2 is realized.
The bus type network topology mode comprises RS232, RS485, CAN and Devicenet, through the adoption of the bus type network topology structure, additional interconnection equipment is not needed, the bus type network topology structure CAN be directly connected through a bus, networking cost is low, through the adoption of the bus type network topology structure, expansion is flexible, only one connector needs to be added when expansion is needed, the bus type network topology structure is easy to maintain, and normal communication of the whole network is not affected due to the fact that a single node (each computer, each concentrator and other equipment CAN be regarded as a node) fails.
Specifically, the state information of the battery module 5 collected by the BMS unit 3 includes an absolute value of a battery capacity, an open-circuit voltage value of the battery, an internal resistance value of the battery, and a self-discharge value of the battery.
Specifically, the state information of the AC/DC unit 4 collected by the BMS unit 3 includes a rated power of the AC/DC unit 4, a current time power of the AC/DC unit 4, a residual discharge power of an nth AC/DC unit 4, a residual charge power of the nth AC/DC unit 4, a charge power that the nth AC/DC unit 4 can also allow, and a discharge power that the nth AC/DC unit 4 can also allow.
Specifically, the specification capacities of the plurality of battery modules 5 are different, the specifications of the plurality of AC/DC units 4 are different, the AC/DC units 4 under the multiple branches may not be of uniform type specifications, and the battery modules 5 are also different from each other.
Specifically, a CPU capable of processing information transmitted by the flexible control unit 2 is arranged in the background server 6, the CPU is TMS320F2812, and the CPU has 128Kx16 Flash and 18Kx16 SRAM.
The existing distributed energy storage multi-branch control strategies are roughly as follows:
1) topologically, under the same converter, the multiple AC/DC units 4 are all in a uniform type specification;
2) the multi-branch AC/DC units 4 are of a uniform type specification, and are generally distributed according to average power during energy distribution, for example, 200kW PCS, 4 50kW module AC/DC units 4 are shared, and when the power instruction value is 100kW, 25kW is distributed to each AC/DC unit 4 according to average distribution;
3) when the battery modules 5 are distributed in proportion, the capacity of the battery module 5 is only required to be considered, that is, the power allowed by the nth battery module 5 is divided by the sum of the powers allowed by all the battery modules 5 to obtain a proportion, and the power fixed value is multiplied by the proportion coefficient to obtain the power distribution instruction of the nth battery module 5.
The utility model discloses lie in with the difference of current distributed energy storage multi-branch control strategy:
the utility model discloses the topology based on is different, and multi-branch AC/DC unit 4 is not unified model specification, and 5 capacities of battery module are also different in addition, can effectively solve flexible power distribution strategy and dynamic adjustment's technique under many specifications AC/DC unit 4 and many specifications battery module 5.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (6)
1. Based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment, including isolation transformer (1), flexible control unit (2), a plurality of BMS unit (3), a plurality of AC/DC unit (4), a plurality of battery module (5) and backend server (6), its characterized in that:
the plurality of battery modules (5) are arranged in parallel with each other, and the battery modules (5) are arranged in series with the BMS unit (3) and the AC/DC unit (4);
the BMS units (3), the AC/DC units (4) and the battery modules (5) are arranged in a one-to-one correspondence manner, and the BMS units (3) and the AC/DC units (4) are mutually connected in series;
the BMS unit (3) and the AC/DC unit (4) are electrically connected with the flexible control unit (2), and the flexible control unit (2) can be communicated with the background server (6) through wires and/or wirelessly;
the flexible control unit (2) is connected with the isolation transformer (1) through a cable, the flexible control unit (2) is connected to an external power grid through the isolation transformer (1), and the isolation transformer (1) can isolate and match voltage;
the BMS unit (3) is used for acquiring state information of the corresponding battery module (5), and the AC/DC unit (4) switches charging/discharging of the battery module (5);
the flexible control unit (2) can collect and transmit the state information of the battery module (5) and the state information of the AC/DC unit (4) collected by the BMS unit (3) to the background server (6);
the background server (6) carries out flexible charging and discharging power distribution on the battery module (5) according to the transmission information of the flexible control unit (2), the background server (6) can send flexible charging and discharging power distribution results to the flexible control unit (2) in a wired and/or wireless mode, and the flexible control unit (2) carries out flexible charging and discharging on the battery module (5) according to the flexible charging and discharging power distribution results.
2. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: and bus type network topological structures are adopted among the flexible control unit (2), the BMS unit (3) and the AC/DC unit (4), and the bus type network topological modes comprise RS232, RS485, CAN and Devicenet.
3. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the state information of the battery module (5) collected by the BMS unit (3) comprises a battery capacity absolute value, an open-circuit voltage value of the battery, an internal resistance value of the battery and a self-discharge value of the battery.
4. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the state information of the AC/DC unit (4) collected by the BMS unit (3) comprises rated power of the AC/DC unit (4), power of the AC/DC unit (4) at the current moment, residual discharge power of the nth AC/DC unit (4), residual charge power of the nth AC/DC unit (4), allowable charge power of the nth AC/DC unit (4) and allowable discharge power of the nth AC/DC unit (4).
5. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the specification and capacity of the battery modules (5) are different, and the specification of the AC/DC units (4) is different.
6. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the background server (6) is internally provided with a CPU which can process the information transmitted by the flexible control unit (2), and the CPU is TMS320F 2812.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020974322.7U CN212162825U (en) | 2020-06-01 | 2020-06-01 | Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020974322.7U CN212162825U (en) | 2020-06-01 | 2020-06-01 | Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212162825U true CN212162825U (en) | 2020-12-15 |
Family
ID=73702672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020974322.7U Active CN212162825U (en) | 2020-06-01 | 2020-06-01 | Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212162825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115352305A (en) * | 2022-08-30 | 2022-11-18 | 广东天枢新能源科技有限公司 | Distributed flexible interconnection and energy storage integrated charging pile system |
-
2020
- 2020-06-01 CN CN202020974322.7U patent/CN212162825U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115352305A (en) * | 2022-08-30 | 2022-11-18 | 广东天枢新能源科技有限公司 | Distributed flexible interconnection and energy storage integrated charging pile system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109861261B (en) | EMS-based power balance control method and energy storage control system for energy storage converter | |
| CN201985554U (en) | Active self-management charging device for lithium ion power battery | |
| CN104993602A (en) | Modular energy storage system | |
| CN217036766U (en) | Power battery device | |
| CN114050621B (en) | Distributed energy storage power distribution system and method | |
| CN112510743A (en) | Energy storage converter | |
| CN217642739U (en) | Energy storage battery system and energy storage equipment | |
| CN211790793U (en) | Retired battery echelon utilization system | |
| CN105656050A (en) | Intelligent energy storage and power distribution system | |
| CN112186822A (en) | Energy storage system based on low-voltage isolation battery unit | |
| CN113595180A (en) | Power battery device | |
| CN216312687U (en) | Photovoltaic energy storage direct current intelligent micro-grid monitoring management system | |
| CN104578433A (en) | Switchable electric energy storage system and using method thereof | |
| CN110854954A (en) | Intelligent scheduling system and scheduling method for battery cluster of energy storage system | |
| CN212162825U (en) | Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system | |
| CN204835716U (en) | Modular energy storage system | |
| CN112510803B (en) | Single-channel module of airplane distributed power grid structure, power generation system and control method | |
| CN210297268U (en) | Hybrid energy storage system for thermal power combined AGC frequency modulation | |
| CN112713520A (en) | Off-grid wind-solar energy storage intelligent power supply system | |
| CN111525602A (en) | Energy storage system and energy storage device | |
| CN111541275A (en) | Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system | |
| CN212543374U (en) | Direct-current power supply system for 110kV intelligent energy station | |
| CN212258417U (en) | DC power supply system for 220kV intelligent energy station | |
| CN113629800A (en) | Battery cell level optimized battery plug box, energy storage system and application of battery cell level optimized battery plug box | |
| CN112821374A (en) | Intelligent direct-current micro-grid system supporting plug and play |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |